AU2024203422B2

AU2024203422B2 - Fuel supply system

Info

Publication number: AU2024203422B2
Application number: AU2024203422A
Authority: AU
Inventors: Jonathan Florent Douce; Steven Vose
Original assignee: Allied Pumps Pty Ltd
Current assignee: Allied Pumps Pty Ltd
Priority date: 2021-08-11
Filing date: 2024-05-22
Publication date: 2025-09-04
Anticipated expiration: 2041-08-11
Also published as: AU2021215197B2; AU2025271519A1; AU2021215197A1; AU2021107610B4; AU2021107610A4; AU2024203422A1

Abstract

A fuel supply system for a generator engine comprises first and second tanks and an actuable valve assembly fluidly connected to the engine and first tank. The valve assembly operated by a system controller is releasably fluidly connectable to the second tank and is switchable between first and second operating modes wherein fuel is supplied to the engine from, respectively, the first and second tank by a pump. A sensor outputs sensor information corresponding to a fuel level in the second tank. When the second tank is disconnected, the valve assembly operates in the first operating mode only. When the second tank is connected, in response to the sensor information the valve assembly operates in the second operating mode when a fuel level in the second tank is at or above a predetermined level and operates in the first operating mode when the fuel level is below the predetermined level.

Description

FUEL SUPPLY SYSTEM

Field purposes. If the operator is not available to perform the switchover, or fails to notice that

[0001] The present invention relates to fuel supply systems and, more particularly, to a inefficient and consumes human resources that could be used for other, more-useful

tank instead of the second fuel tank. Requiring an operator to perform this task is fuel supply system for an engine-generator that uses multiple fuel tanks. valve that a human operator uses to cause the engine to extract fuel from the first fuel

Background happen, the generator typically includes a manually-operated mechanical switchover 2024203422

until fuel subsequently becomes available from the second fuel tank. To allow this to

[0002] A variety of electrical equipment and systems are used in remote locations in generator, the generator's engine can then use fuel from the first (onboard) fuel tank industry. For example, electric submersible pumps (ESPs) are commonly used to pump When the second fuel tank has been depleted of fuel or is disconnected from the oil and water from wellbores and to control groundwater in mining and construction be disconnected, replenished and reconnected to the generator during use as required. projects. When a grid-based supply of electricity is not available to power a pump, generator's engine. The second fuel tank provides an additional source of fuel that can electricity must be created and supplied locally using an electric generator. A generator therefore, provided with a second fuel tank that is detachably connectable to the typically comprises an engine, such as a reciprocating diesel or petrol engine, that is during this period, then the generator stops operating. Some engine-generators are, mechanically coupled to an alternator to produce AC power. Electric generators of this continuous supply of power over a long period of time. If the fuel in the tank is used up configuration are commonly referred to as engine-generators. applications, it is necessary for the generator to produce an uninterrupted and

[0003] An housing or engine-generator includes trailer structure a fuel that the tank that is normally engine-generator integrated is mounted to. Forinto the many

housingAn or

[0003] trailer structure engine-generator that athe includes fuelengine-generator is mounted tank that is normally to.intoFor integrated the many

applications, it is necessary for the generator to produce an uninterrupted and configuration are commonly referred to as engine-generators. continuous supply of power over a long period of time. If the fuel in the tank is used up mechanically coupled to an alternator to produce AC power. Electric generators of this during this period, then the generator stops operating. Some engine-generators are, typically comprises an engine, such as a reciprocating diesel or petrol engine, that is therefore, provided with a second fuel tank that is detachably connectable to the electricity must be created and supplied locally using an electric generator. A generator generator’s engine. The second fuel tank provides an additional source of fuel that can projects. When a grid-based supply of electricity is not available to power a pump, be disconnected, replenished and reconnected to the generator during use as required. oil and water from wellbores and to control groundwater in mining and construction When the second fuel tank has been depleted of fuel or is disconnected from the industry. For example, electric submersible pumps (ESPs) are commonly used to pump generator, the generator’s engine can then use fuel from the first (onboard) fuel tank

[0002] A variety of electrical equipment and systems are used in remote locations in until fuel subsequently becomes available from the second fuel tank. To allow this to happen, the generator typically includes a manually-operated mechanical switchover Background valve that a human operator uses to cause the engine to extract fuel from the first fuel tank instead of the second fuel tank. Requiring an operator to perform this task is fuel supply system for an engine-generator that uses multiple fuel tanks.

inefficient and consumes human resources that could be used for other, more-useful

[0001] The present invention relates to fuel supply systems and, more particularly, to a

purposes. If the operator is not available to perform the switchover, or fails to notice that Field

FUEL SUPPLY SYSTEM

the second tank is near to being depleted, then the generator can become starved of fuel and cease to operate.

[0004] The preceding discussion of the background art is intended to facilitate an of fuel in the second fuel tank is at or above a predetermined level stored in the understanding of the present invention only. The discussion is not an acknowledgement actuable valve assembly to operate in the second operating mode when a level or admission that any of the material referred to is or was part of the common general assembly, in response to the sensor information the system controller causes the knowledge as at the priority date of the application. when the second fuel tank is fluidly connected to the actuable valve 2024203422

Summary in the first operating mode only; and

assembly, the system controller causes the actuable valve assembly to operate

[0005] According whentothe thesecond present invention, fuel there isdisconnected tank is fluidly provided a system from thefor supplying actuable fuel valve

to an engine wherein of an the system electrical controller is generator, thethat: configured such system comprising: a first a systemfuelcontroller tank and connected a second fuel tank; to the actuable valve assembly and to the sensor,

an actuable in the second valve fuel tank; assembly that is fluidly connected to the engine and to the first fuel tank, wherein the actuable valve assembly is also detachably fluidly connectable to a sensor configured to output sensor information corresponding to a level of fuel

thethe to second fuel engine viatank the and is operatively actuable switchable valve assembly; between at least a first and a second operating mode, a fuel pump wherein in the for pumping first from the fuel operating mode the first fuelthe tankactuable valvefuel and/or second assembly tank is configured only to supply from the the fuel second fuel tankonly fromengine; to the the first fuel tank to the engine, and wherein in the second the operatingmode second operating modethethe actuable actuable valve valve assembly assembly is configured is configured to supply to supply the the fuelfuel

only from to configured thesupply second fuel only the fuel tankfrom to the theengine; first fuel tank to the engine, and wherein in

a fuel operating pump mode, for pumping wherein the fuel in the first from the operating first mode thefuel tank and/or actuable valve second assemblyfuel is tank to the the engine second viatank fuel the and actuable valve assembly; is operatively switchable between at least a first and a second

a sensor fuel tank, configured wherein to output the actuable valve sensor assemblyinformation corresponding is also detachably fluidlytoconnectable a level of fuel to

in the second fuel tank; an actuable valve assembly that is fluidly connected to the engine and to the first

a first a systemfuelcontroller tank and aconnected second fuel to the tank; actuable valve assembly and to the sensor, wherein to theofsystem an engine controller an electrical is configured generator, the systemsuch that: comprising:

when

[0005] According thepresent to the secondinvention, fuel tank isthere fluidly is disconnected from for provided a system the supplying actuable valve fuel

assembly, the system controller causes the actuable valve assembly to operate Summary in the first operating mode only; and when the second fuel tank is fluidly connected to the actuable valve knowledge as at the priority date of the application. assembly, in response to the sensor information the system controller causes the or admission that any of the material referred to is or was part of the common general actuable valve assembly to operate in the second operating mode when a level understanding of the present invention only. The discussion is not an acknowledgement of fuel in the second fuel tank is at or above a predetermined level stored in the

[0004] The preceding discussion of the background art is intended to facilitate an

fuel and cease to operate.

the second tank is near to being depleted, then the generator can become starved of

system controller, and to operate in the first operating mode when the level of fuel is below the predetermined level. and

[0006] fuel Theline supply system to themay inputcomprise: fuel line, and the first fuel return line to the output fuel line;

a first in hydraulic the first fuel mode, operating circuittheforactuable circulating valve the fuel between assembly the first fluidly connects thefuel tank first and the engine;

[0009] The actuable valve assembly may be configured such that:

a second hydraulic fuel circuit for circulating the fuel between the second fuel 2024203422

tank and to assembly thethe engine; secondand fuel tank.

one a or more second fuel injectors fuel return for injecting line arranged to return the the fuel fuel into from the engine from the actuable valve the first and the second hydraulic fuel circuit, wherein the actuable valve assembly and fuel pump are the actuable valve assembly; and

configured suchfuel a second thatsupply in theline firstarranged and theto second operating supply the fuel from mode the fuel the second fuel is circulated tank to

under pressure the input around, respectively, and the output fuel line;the first and the second hydraulic fuel circuit.

[0008] The second hydraulic fuel circuit may be provided by:

[0007] The actuable valve assembly may comprise an input fuel line and an output fuel line arranged assembly to supply to the first the fuel fuel tank. to and from the fuel injectors respectively, wherein the first hydraulic a first fuel fuel circuit is provided return line arranged by: to return the fuel from the actuable valve

actuablethe input valve and the and assembly; output fuel line; a first a first fuel fuel supply line arranged supply line arranged to to supply supply the the fuelfuel fromfrom the first the first fuel fuel tank tank to to the the actuable thevalve inputassembly; andfuel and the output line;

a first fuel first hydraulic fuel return circuit line arranged is provided by: to return the fuel from the actuable valve assembly line totothe arranged first the supply fuelfuel tank. to and from the fuel injectors respectively, wherein the

[0007] The actuable valve assembly may comprise an input fuel line and an output fuel

[0008] The second hydraulic fuel circuit may be provided by: the input under pressure andrespectively, around, the output fuel line; and the second hydraulic fuel circuit. the first

a second configured such thatfuel supply in the first line arranged and the to supplymode second operating thethe fuelfuel from is the second circulated fuel tank to the actuable the valve assembly; second hydraulic and wherein the actuable valve assembly and fuel pump are fuel circuit,

a second one or more fuel fuel return lineforarranged injectors injectingto return the the fuel fuel into from the the engine from actuable the first valve and

assembly tank to the and the second engine; and fuel tank. a second hydraulic fuel circuit for circulating the fuel between the second fuel

[0009] The actuable valve assembly may be configured such that: the engine;

infirst a the first operating hydraulic mode,for fuel circuit thecirculating actuable valve assembly the fuel fluidly between the firstconnects the fuel tank and first fuel supply

[0006] line to may The system the comprise: input fuel line, and the first fuel return line to the output fuel line; and fuel is below the predetermined level.

system controller, and to operate in the first operating mode when the level of

in the second operating mode, the actuable valve assembly fluidly connects the second fuel supply line to the input fuel line, and the second fuel return line to the output fuel line. level stored in the system controller.

sensor indicates that a level of fuel in the third fuel tank is at or above a predetermined

[0010]from engine Thethesensor maytank third fuel be detachably connected when the sensor tooutput information the system controller, by the additional wherein the system the controller system is configured controller causes thetoactuable enable and valvedisable thetosecond assembly supplyoperating mode the fuel to the

automatically information when thetosensor corresponding is, of an amount respectively, connected fuel available and in the third disconnected fuel tank, wherein to/from the 2024203422

system controller. additional sensor connected to the system controller that is configured to output sensor

fuel tank being detachably fluidly connectable to the actuable valve assembly, and an

[0011]The

[0015] The system system controller may comprise may one at least be configured to enable additional fuel the tank, the second (third) additional operating mode only when the level of fuel in the second fuel tank is at or above the predetermined level storedainpredetermined below the system controller. level stored in the system controller.

information output by the second sensor, that a level of fuel in the first fuel tank is at or

[0012] pump The from sensor may operating when be thedetachably connected system controller to the system determines, based controller by a on the sensor control line that is available in provided withtank, the first fuel a plug and socket wherein arrangement. the system controller is configured to stop the fuel

that is configured to output sensor information corresponding to an amount of fuel

[0013] The

[0014] Thesystem sensormay may be deployed comprise inside a second and sensor attachedtotothe connected thesystem secondcontroller fuel tank.

[0014] The

[0013] Thesensor system may may be comprise a second deployed inside and sensor attachedconnected to the to the second system fuel tank.controller

that is configured to output sensor information corresponding to an amount of fuel available line that in is the first fuel provided tank, with wherein a plug the system and socket controller arrangement. is configured to stop the fuel pump from

[0012] operating The sensor may when the system be detachably controller connected determines, to the based onbythe system controller sensor a control

information output by the second sensor, that a level of fuel in the first fuel tank is at or below in stored a predetermined level the system controller. stored in the system controller. only when the level of fuel in the second fuel tank is at or above the predetermined level

[0015] The

[0011] Thesystem system may comprise controller may beatconfigured least one to additional fuelsecond enable the tank, the additional operating mode(third)

fuel tank being detachably fluidly connectable to the actuable valve assembly, and an additional system sensor controller. connected to the system controller that is configured to output sensor information corresponding automatically to an when the sensor is,amount of fuel connected respectively, available in the and third fuel tank, disconnected wherein to/from the

the system system controller controller causes thetoactuable is configured valve enable and assembly disable to supply the second the fuel operating to mode the engine The

[0010] fromsensor the third may fuel tank whenconnected be detachably the sensor to information output by the the system controller, additional wherein the

sensor indicates that a level of fuel in the third fuel tank is at or above a predetermined level stored in the system controller. fuel line.

second fuel supply line to the input fuel line, and the second fuel return line to the output

in the second operating mode, the actuable valve assembly fluidly connects the

[0016] The system may comprise a communication means for remotely connecting the system motor electric controller to one such that the or setmore point remote user devices, is maintained. wherein the system controller is configured to issue in response to an thealert or notification information output byto the the one load or more sensor, remote control userofdevices the speed the by the communication the electric motor;means and when the system controller determines that the level of fuel in the secondstore fuel tank is below at least one seta point predetermined level relating to an storedenvironment operating in the system controller. or condition of

[0020] The generator controller may: 2024203422

[0017] The present invention also provides a generator system, the generator system comprising: in response to the information output by the load sensor.

speed of an the engine; electric motor by controlling the throttle controller and the voltage regulator

the system, the generator asisdescribed controller above, connected to forsensor the load supplying and isfuel to the engine; configured to control a

an alternator information driven by the about an operating engine to environment orproduce anofalternating condition current, the electric thewherein motor,

alternator

[0019] The comprising a voltage generator system may regulator comprise afor controlling load a voltage of sensor configured to the alternating output

current; a throttle alternating current controller produced byfor thecontrolling alternator. a rotational speed of the engine and, therefore, frequency

[0018] The of the alternating generator current; system may and an comprise electric motor powered by the

a generator controller configured to control the throttle controller and the voltage regulatortotocontrol regulator controlthe thefrequency frequency and voltage and voltage of the of the alternating alternating current current respectively. respectively.

a generator controller configured to control the throttle controller and the voltage

[0018] The frequency generator of the system alternating may current; andcomprise an electric motor powered by the alternating current a throttle produced controller forby the alternator. controlling a rotational speed of the engine and, therefore,

current;

[0019] The alternator generator comprising system a voltage may comprise regulator a loada sensor for controlling configured voltage of to output the alternating

information about an an alternator operating driven by the environment or condition engine to produce of the an alternating electric current, the motor, wherein

the generator controller the system, is connected as described above,tofor thesupplying load sensor fueland to is configured the engine; to control a

speed of the electric motor by controlling the throttle controller and the voltage regulator an engine;

in response to the information output by the load sensor. comprising:

[0017] The present invention also provides a generator system, the generator system

[0020] The generator controller may: store second fuel tankatis least belowone set point relating a predetermined to aninoperating level stored the systemenvironment controller. or condition of the electric motor; communication meansand when the system controller determines that the level of fuel in the

in to configured response issue an to theorinformation alert notificationoutput to the by one the loadremote or more sensor, usercontrol devices the speed by the of the electric motor such that the set point is maintained. system controller to one or more remote user devices, wherein the system controller is

[0016] The system may comprise a communication means for remotely connecting the

[0021] The electric motor may operatively drive a submersible pump and the set point may relate to an operating environment or condition of the submersible pump.

[0022] the fuelThe set point supply systemmay be onetoofaa further according set of values corresponding example embodiment of to a desired the fluid invention. pressure, a desired Figure 3 is afluid flow rate schematic and aofdesired diagram fluid level. an electrical generator system that includes

the fuel supply system according to a further example embodiment of the invention; and 2024203422

[0023] The generator Figure controllerdiagram 2 is a schematic may comprise a first controller of an electrical generatorconnected to aincludes system that second controller, wherein electrical generatorthe first controller according is connected to an example to theofload embodiment the sensor and invention; is configured to generate and send Figure control signals 1 is schematic to of diagram theasecond controller fuel supply systembased onengine for an the information of an output by to reference thethe load sensor, anddrawings, accompanying wherein in thewhich: second controller is connected to the throttle controller

[0026] and to the Embodiments ofvoltage regulator the invention and will is be now configured describedtobycontrol way ofthe speedonly example of the with electric motor by controlling the throttle controller and the voltage regulator in response to the Description Brief control signals. of Drawings

[0024] The

[0025] Thegenerator control signals sent may controller to the be second integralcontroller with the may comprise system a target controller. speed of the electric motor, wherein the second controller causes the electric motor to operate at the target speed. the target speed.

the electric motor, wherein the second controller causes the electric motor to operate at

[0025] The

[0024] Thecontrol generator controller signals sent tomay thebe integral second with the may controller system controller. comprise a target speed of

Brief to the Description of control signals. Drawings electric motor by controlling the throttle controller and the voltage regulator in response

[0026] Embodiments of the invention will now be described by way of example only with controller and to the voltage regulator and is configured to control the speed of the

reference to the accompanying drawings, in which: output by the load sensor, and wherein the second controller is connected to the throttle

generateFigure 1 is and send schematic control signalsdiagram of a fuel to the second supplybased controller system for information on the an engine of an electrical generator according to an example embodiment of the invention; controller, wherein the first controller is connected to the load sensor and is configured to

Figure

[0023] The 2 is a schematic generator controller diagram of ana electrical may comprise generator first controller system to connected that a includes second the fuel supply system according to a further example embodiment of the invention; and Figure 3 is a schematic diagram of an electrical generator system that includes pressure, a desired fluid flow rate and a desired fluid level.

the fuelThe

[0022] supply system set point mayaccording be one oftoa aset further example of values embodiment corresponding ofdesired to a the invention. fluid

may relate to an operating environment or condition of the submersible pump.

[0021] The electric motor may operatively drive a submersible pump and the set point

Description of Embodiments

[0027] Referring to Figure 1, an example embodiment of the present invention provides assembly 18. The system 10 also comprises a first fuel supply line 34 that is arranged a system 10 for supplying fuel to an engine 12 of an electrical generator. The system 10 sprayed by the injectors into the engine 12 cylinders back to the actuable valve comprises a first fuel tank 14 and a second fuel tank 16. An actuable valve assembly 18 fuel to the injectors, and an output fuel line 32 for returning unused fuel that is not is fluidly connected to the engine 12 and to the first fuel tank 14. The actuable valve actuable valve assembly 18, therefore, comprises an input fuel line 30 for supplying the assembly 18 is also detachably fluidly connectable to the second fuel tank 16 and is the fuel under pressure to one or more fuel injectors deployed in the engine 12. The operatively switchable between at least a first and a second operating mode. In the first 2024203422

[0029] More particularly, in the example depicted the system 10 is configured to supply operating mode, the actuable valve assembly 18 is configured to supply the fuel from the first fuel tank 14 to the engine 12. In the second operating mode, the actuable valve the level of fuel is below the predetermined level. assembly 18 is configured to supply the fuel from the second fuel tank 16 to the engine stored in the system controller 24, and to (b) operate in the first operating mode when 12. The system 10 also comprises a fuel pump 20 for pumping the fuel from the first fuel when a level of fuel in the second fuel tank 16 is at or above a predetermined level tank 14 and/or second fuel tank 16 to the engine 12 via the actuable valve assembly 18, causes the actuable valve assembly 18 to (a) operate in the second operating mode and a sensor 22 configured to output sensor information corresponding to a level of fuel valve assembly 18, in response to the sensor information the system controller 24 in the second fuel tank 16. mode only, and (ii) when the second fuel tank 16 is fluidly connected to the actuable

controller 24 causes the actuable valve assembly 18 to operate in the first operating

[0028] A system controller 24 is connected to the actuable valve assembly 18 and to the tank 16 is fluidly disconnected from the actuable valve assembly 18, the system sensor 16. The system controller 24 is configured such that (i) when the second fuel sensor 16. The system controller 24 is configured such that (i) when the second fuel tank 16 is fluidly disconnected from the actuable valve assembly 18, the system

[0028] A system controller 24 is connected to the actuable valve assembly 18 and to the controller 24 causes the actuable valve assembly 18 to operate in the first operating mode only, and (ii) when the second fuel tank 16 is fluidly connected to the actuable in the second fuel tank 16. valve assembly 18, in response to the sensor information the system controller 24 and a sensor 22 configured to output sensor information corresponding to a level of fuel causes the actuable valve assembly 18 to (a) operate in the second operating mode tank 14 and/or second fuel tank 16 to the engine 12 via the actuable valve assembly 18, when a level of fuel in the second fuel tank 16 is at or above a predetermined level 12. The system 10 also comprises a fuel pump 20 for pumping the fuel from the first fuel stored in the system controller 24, and to (b) operate in the first operating mode when assembly 18 is configured to supply the fuel from the second fuel tank 16 to the engine the level of fuel is below the predetermined level. first fuel tank 14 to the engine 12. In the second operating mode, the actuable valve

operating mode, the actuable valve assembly 18 is configured to supply the fuel from the

[0029] More particularly, in the example depicted the system 10 is configured to supply operatively switchable between at least a first and a second operating mode. In the first the fuel under pressure to one or more fuel injectors deployed in the engine 12. The assembly 18 is also detachably fluidly connectable to the second fuel tank 16 and is actuable valve assembly 18, therefore, comprises an input fuel line 30 for supplying the is fluidly connected to the engine 12 and to the first fuel tank 14. The actuable valve fuel to the injectors, and an output fuel line 32 for returning unused fuel that is not comprises a first fuel tank 14 and a second fuel tank 16. An actuable valve assembly 18 sprayed by the injectors into the engine 12 cylinders back to the actuable valve a system 10 for supplying fuel to an engine 12 of an electrical generator. The system 10 assembly 18. The system 10 also comprises a first fuel supply line 34 that is arranged

[0027] Referring to Figure 1, an example embodiment of the present invention provides

Description of Embodiments

to supply fuel from the first fuel tank 14 to the actuable valve assembly 18, and a first fuel return line 36 that is arranged to return unused fuel from the actuable valve detachably connected to the system controller 24 by a control line 42 that is provided assembly 18 back to the first fuel tank 14. In this configuration, fuel lines 30, 32, 34, 36 and disconnected to/from the system controller 24. For example, the sensor 22 may be together form a first hydraulic fuel circuit that is used to circulate fuel from the first fuel second operating mode automatically when the sensor 22 is, respectively, connected tank 14 to and from the injectors of the engine 12. The system 10 also comprises a such examples, the system controller 24 may be configured to enable and disable the second fuel supply line 38 that is arranged to supply fuel from the second fuel tank 16 to

[0031] The sensor 22 may be detachably connected to the system controller 24. In the actuable valve assembly 18, and a second fuel return line 40 that is arranged to 2024203422

return unused fuel from the actuable valve assembly 18 back to the second fuel tank 16. circuits.

In this configuration, fuel lines 30, 32, 38, 40 together form a second hydraulic fuel circuit the system controller 24 to switch selectively between the first and second hydraulic fuel

that is such as used to circulate solenoid actuatedfuel fromthat valves, the second operate fuel tank 16 to in response to and fromsignals control the injectors issued of bythe engine 12. assembly 18 may comprise a pair of electrically actuatable directional control valves 43,

valve assembly 18, about the second hydraulic fuel circuit. The actuable valve

[0030] In the above configuration, when the system controller 24 causes the actuable then causes fuel from the second fuel tank 16 to be circulated under pressure, via the valve assembly 18 to switch into its first operating mode, the actuable valve assembly 18 to the output fuel line 32, thus completing the second hydraulic fuel circuit. The pump 20 fluidly connects the first fuel supply line 34 to the input fuel line 30, and fluidly connects supply line 38 to the input fuel line 30, and fluidly connects the second fuel return line 40 the first fuel return line 36 to the output fuel line 32, thus completing the first hydraulic second operating mode, the actuable valve assembly 18 fluidly connects the second fuel fuel circuit. The pump 20 then causes fuel from the first fuel tank 14 to be circulated when the system controller 24 causes the actuable valve assembly 18 to switch into its under pressure, via the valve assembly 18, about the first hydraulic fuel circuit. Similarly, under pressure, via the valve assembly 18, about the first hydraulic fuel circuit. Similarly, when the system controller 24 causes the actuable valve assembly 18 to switch into its fuel circuit. The pump 20 then causes fuel from the first fuel tank 14 to be circulated second operating mode, the actuable valve assembly 18 fluidly connects the second fuel the first fuel return line 36 to the output fuel line 32, thus completing the first hydraulic supply line 38 to the input fuel line 30, and fluidly connects the second fuel return line 40 fluidly connects the first fuel supply line 34 to the input fuel line 30, and fluidly connects to the output fuel line 32, thus completing the second hydraulic fuel circuit. The pump 20 valve assembly 18 to switch into its first operating mode, the actuable valve assembly 18 then causes fuel from the second fuel tank 16 to be circulated under pressure, via the

[0030] In the above configuration, when the system controller 24 causes the actuable valve assembly 18, about the second hydraulic fuel circuit. The actuable valve assembly engine 12. 18 may comprise a pair of electrically actuatable directional control valves 43, such as solenoid actuated valves, that operate in response to control signals issued by that is used to circulate fuel from the second fuel tank 16 to and from the injectors of the

the system controller 24 to switch selectively between the first and second hydraulic fuel In this configuration, fuel lines 30, 32, 38, 40 together form a second hydraulic fuel circuit

circuits.unused fuel from the actuable valve assembly 18 back to the second fuel tank 16. return

the actuable valve assembly 18, and a second fuel return line 40 that is arranged to

[0031] The sensor 22 may be detachably connected to the system controller 24. In second fuel supply line 38 that is arranged to supply fuel from the second fuel tank 16 to such examples, the system controller 24 may be configured to enable and disable the tank 14 to and from the injectors of the engine 12. The system 10 also comprises a second operating mode automatically when the sensor 22 is, respectively, connected together form a first hydraulic fuel circuit that is used to circulate fuel from the first fuel and disconnected to/from the system controller 24. For example, the sensor 22 may be assembly 18 back to the first fuel tank 14. In this configuration, fuel lines 30, 32, 34, 36 detachably connected to the system controller 24 by a control line 42 that is provided fuel return line 36 that is arranged to return unused fuel from the actuable valve

to supply fuel from the first fuel tank 14 to the actuable valve assembly 18, and a first

with a plug and socket arrangement 44. The sensor 22 may comprise any device that is capable of generating a signal that corresponds to the amount of fuel remaining in the second fuel tank 16. For example, the sensor 22 may comprise a float-based, ultrasonic, The predetermined fuel level may be a value that corresponds to the tank 16 being capacitive, resistive film or discrete resistor-based level sensor. The sensor 22 may fuel tank 16 falls below the predetermined fuel level stored in the system controller 24. output an electrical signal that directly corresponds to the current fuel level that the valve assembly 18 to switch into the first operation mode when the fuel in the second system controller 24 is capable of receiving and processing. For example, the sensor 22 before any fuel is used from the first tank 14. The system controller 24 only causes the may output an analogue electrical signal falling within a 4-20 mA range, wherein the 2024203422

the second operation mode such that the fuel in tank 16 is always used by the engine 12 value of the signal current corresponds to the level of fuel. When the sensor 22 is available in tank 16, the system controller 24 causes the valve assembly 18 to operate in connected to the system controller 24 using the plug and socket 44, this may complete the second fuel tank 16 and sensor 22 are connected to the system 10 and fuel is an electrical circuit in the control line 42 which the system controller 24 detects and, and fuel is, therefore, consumed by the engine 12 from the first fuel tank 14 only. When therefore, determines automatically that the sensor 22 is available. The system system controller 24 causes the valve assembly 18 to operate in the first operation mode controller 24 may be configured such that it only enables the second operating mode

[0033] In use, when the second fuel tank 16 is not connected to the system 10, the when the information received from the sensor 22 shows that the level of fuel in the second 44. fuel tank 16 is at or above the predetermined level stored in the system controller 24. therefore, be rapidly and easily connected to the controller 24 using the plug and socket

the sensor 22 is conveniently already deployed inside the second fuel tank 16 and may,

[0032] The sensor 22 may be deployed and attached to an inside part of the second fuel generator for connection to the valve assembly 18 and system controller 24 during use, tank 16. In such examples, when the second fuel tank 16 is delivered to the electrical tank 16. In such examples, when the second fuel tank 16 is delivered to the electrical generator for connection to the valve assembly 18 and system controller 24 during use,

[0032] The sensor 22 may be deployed and attached to an inside part of the second fuel the sensor 22 is conveniently already deployed inside the second fuel tank 16 and may, therefore, be rapidly and easily connected to the controller 24 using the plug and socket controller 24.

44. second fuel tank 16 is at or above the predetermined level stored in the system

when the information received from the sensor 22 shows that the level of fuel in the

[0033] In use, when the second fuel tank 16 is not connected to the system 10, the controller 24 may be configured such that it only enables the second operating mode system controller 24 causes the valve assembly 18 to operate in the first operation mode therefore, determines automatically that the sensor 22 is available. The system and fuel is, therefore, consumed by the engine 12 from the first fuel tank 14 only. When an electrical circuit in the control line 42 which the system controller 24 detects and, the second fuel tank 16 and sensor 22 are connected to the system 10 and fuel is connected to the system controller 24 using the plug and socket 44, this may complete available in tank 16, the system controller 24 causes the valve assembly 18 to operate in value of the signal current corresponds to the level of fuel. When the sensor 22 is the second operation mode such that the fuel in tank 16 is always used by the engine 12 may output an analogue electrical signal falling within a 4-20 mA range, wherein the before any fuel is used from the first tank 14. The system controller 24 only causes the system controller 24 is capable of receiving and processing. For example, the sensor 22 valve assembly 18 to switch into the first operation mode when the fuel in the second output an electrical signal that directly corresponds to the current fuel level that the fuel tank 16 falls below the predetermined fuel level stored in the system controller 24. capacitive, resistive film or discrete resistor-based level sensor. The sensor 22 may The predetermined fuel level may be a value that corresponds to the tank 16 being second fuel tank 16. For example, the sensor 22 may comprise a float-based, ultrasonic,

capable of generating a signal that corresponds to the amount of fuel remaining in the

with a plug and socket arrangement 44. The sensor 22 may comprise any device that is

partially empty (e.g., 50% empty), substantially empty (e.g, 90% or 95% empty) or completely empty.

The alternator 62 comprises a voltage regulator 66 for controlling a voltage of the

[0034] The system 10 may also comprise a second sensor 50 connected to the system rotational speed of the engine 12 and, therefore, frequency of the alternating current. controller 24 that is configured to output sensor information corresponding to an amount alternating current. The engine 12 comprises a throttle controller 64 for controlling a of fuel available in the first fuel tank 14. The system controller 24 may be configured to comprises the engine 12 and an alternator 62 driven by the engine 12 to produce an stop the fuel pump 20 from operating when the system controller 24 determines, based referring to FIG. 2 there is depicted a variable speed AC generator system 60 that on the information from the second sensor 50, that the level of fuel in the first fuel tank 2024203422

engine-generators, including fixed speed and variable-speed generators. For example, 14 is at or below a predetermined level stored in the system controller 24.

[0036] The fuel supply system 10 is suitable for supplying fuel to a variety of

[0035] In other examples, the system 10 may also comprise a third fuel tank (not system 10 and provisioned in a like manner during use. shown) that is detachably fluidly connectable to the actuable valve assembly 18, and a additional detachable fuel tanks (e.g., fourth, fifth tanks, etc.) may be attached to the third sensor (not shown) configured to output sensor information corresponding to an tank 16 has fallen below the relevant predetermined value. In other examples, amount of fuel available in the additional fuel tank. As for the second fuel tank 16, the subsequently, the fuel in the first tank 14 is not used until the level of fuel in the second system controller 24 may cause the actuable valve assembly 18 to supply fuel to the level of fuel in the third tank has fallen below the relevant predetermined value and then, engine 12 from the third fuel tank when the sensor information output by the third sensor order. That is to say, the fuel in the second 16 and first tanks 14 is not used until the indicates that a level of fuel in the third fuel tank is at or above a predetermined level cause the fuel stored in the three tanks to be consumed by the engine 12 in reverse stored in the system controller 24. In such examples, the system controller 24 may stored in the system controller 24. In such examples, the system controller 24 may cause the fuel stored in the three tanks to be consumed by the engine 12 in reverse indicates that a level of fuel in the third fuel tank is at or above a predetermined level order. That is to say, the fuel in the second 16 and first tanks 14 is not used until the engine 12 from the third fuel tank when the sensor information output by the third sensor level of fuel in the third tank has fallen below the relevant predetermined value and then, system controller 24 may cause the actuable valve assembly 18 to supply fuel to the subsequently, the fuel in the first tank 14 is not used until the level of fuel in the second amount of fuel available in the additional fuel tank. As for the second fuel tank 16, the tank 16 has fallen below the relevant predetermined value. In other examples, third sensor (not shown) configured to output sensor information corresponding to an additional detachable fuel tanks (e.g., fourth, fifth tanks, etc.) may be attached to the shown) that is detachably fluidly connectable to the actuable valve assembly 18, and a system 10 and provisioned in a like manner during use.

[0035] In other examples, the system 10 may also comprise a third fuel tank (not

[0036] The fuel supply system 10 is suitable for supplying fuel to a variety of 14 is at or below a predetermined level stored in the system controller 24. engine-generators, including fixed speed and variable-speed generators. For example, on the information from the second sensor 50, that the level of fuel in the first fuel tank referring to FIG. 2 there is depicted a variable speed AC generator system 60 that stop the fuel pump 20 from operating when the system controller 24 determines, based comprises the engine 12 and an alternator 62 driven by the engine 12 to produce an of fuel available in the first fuel tank 14. The system controller 24 may be configured to alternating current. The engine 12 comprises a throttle controller 64 for controlling a controller 24 that is configured to output sensor information corresponding to an amount rotational speed of the engine 12 and, therefore, frequency of the alternating current.

[0034] The system 10 may also comprise a second sensor 50 connected to the system The alternator 62 comprises a voltage regulator 66 for controlling a voltage of the

completely empty.

partially empty (e.g., 50% empty), substantially empty (e.g, 90% or 95% empty) or

alternating current. The system controller 24 operates as a generator controller in addition to controlling the fuel supply system 10 that is integrated into the generator 60. The system controller 24 is, therefore, configured to control the throttle controller 64 and the voltage regulator 66 to, therefore, control the frequency and voltage of the alternating be controlled current by eitherproduced by the alternator the first controller 80 or the 62 respectively. second The controller 82. generator system 60 comprises control the first signals. Theand fuelsecond supply fuel tanks system 14, 16 10 that is that are fluidly integrated intoconnected to the the generator 70engine may

12 by the fuel controlling the supply throttlesystem 10. In controller 76 the and example depicted, the voltage the74first regulator fuel tankto14the in response is an 2024203422

onboard the voltagetank that is regulator incorporated 74 and intoto the is configured housing control or oftrailer a speed structure the electric that motor 73 the by

engine-generator is mounted to, and the second fuel tank 16 is an external tank that the sensor 78. The second controller 82 is connected to the throttle controller 76 and to

may control send be connected signalstotothe theengine-generator second controlleras 82required. However, based on the in other information examples, received from it will first The be appreciated controllerthat both 80 is tanks 14, connected to 16 themay be external sensor 78 and isfuel tanks that configured to are separate generate and to the housing comprises or trailer a first structure controller 80 and thatconnected to theconnected is operatively engine-generator. to a second controller 82.

an operating environment or condition of the electric motor 73. The generator system 70

[0037] FIG. frequency 3 shows of the a further alternating variable current. speed At least oneAC generator sensor system 78 provides 70 that the information fuel about

supply a system throttle 10 may controller 76 forbe integrated controlling into. Thespeed a rotational generator system of the engine 70 istherefore, 12 and, used to drive an electrical74motor regulator load. The for controlling generator a voltage of thesystem 70 current. alternating comprises the engine The engine 12 and 12 comprises the first and second alternating fuel totanks current 14, 16motor an electric that73,are fluidly wherein theconnected tocomprises alternator 72 the engine 12 by a voltage the fuel supply system supply system10. 10.The The generator generator system system 70 comprises 70 comprises an alternator an alternator 72supplying 72 for for supplying an an alternating and current second fuel to 14, tanks an electric 16 that motor 73, wherein are fluidly the alternator connected 72 comprises to the engine a voltage 12 by the fuel

regulator 74 electrical for controlling motor a voltage system load. The generator of the alternating 70 comprisescurrent. The12 the engine engine 12 first and the comprises a throttle supply controller system 10 may 76 be for controlling integrated a rotational into. speed The generator of the system 70 engine is used12 toand, therefore, drive an

frequency

[0037] FIG.of3 the alternating shows a furthercurrent. variable At least speed ACone sensorsystem generator 78 provides 70 thatinformation the fuel about an operating environment or condition of the electric motor 73. The generator system 70 comprises the a trailer housing or first controller structure 80 and that is operatively connected connected to the engine-generator. to a second controller 82. The befirst will controller appreciated 80both that is connected tanks 14, 16 to maythe sensor fuel be external 78 and isthat tanks configured to generate are separate to and send control signals to the second controller 82 based on the information received from may be connected to the engine-generator as required. However, in other examples, it

the sensor 78. The engine-generator secondto, is mounted controller and the 82 is connected second fuel tank to 16the is throttle controller an external 76 and tank that to the voltage onboard tank regulator 74 and is configured that is incorporated to control into the housing a speedstructure or trailer of the electric motor that the 73 by controlling the supply 12 by the fuel throttlesystem controller 10. In76 theand the voltage example depicted,regulator the first74 in response fuel tank 14 is to an the

control signals. comprises Theand the first fuel supply second system fuel tanks 10 14, that is integrated 16 that intoconnected are fluidly the generator to the 70 may engine

be controlled alternating by either current the first produced by controller 80 or 62 the alternator therespectively. second controller 82. The generator system 60

the voltage regulator 66 to, therefore, control the frequency and voltage of the

The system controller 24 is, therefore, configured to control the throttle controller 64 and

addition to controlling the fuel supply system 10 that is integrated into the generator 60.

alternating current. The system controller 24 operates as a generator controller in

[0038] More particularly, the electric motor 73 may operatively drive any device or mechanism that needs to be operated on a variable speed basis. For example, the of between 400V and 4,800V to allow the system 70 to power and control submersible electric motor 73 may drive a pump, such as a centrifugal or positive displacement For example, the generator system 12 may be configured to produce an output voltage pump, a fan or a conveyor system. In the example depicted, the generator system 70 is output voltage falling within a wide range may be produced by the generator system 70. shown connected to an electric motor 73 that operatively drives a submersible pump 90. voltage to be achieved. The AVR 74 and alternator 72 may be configured such that an The submersible pump 90 may comprise a centrifugal pump as commonly used in 74 may receive a continuous signal from the second controller 82 representing the target submersible pumps used in the oil and gas industry to pump oil and oil/water mixtures 2024203422

sequence of target output voltages from the second controller 82 over time, or the AVR from wellbores (commonly known as “artificial lift” applications) and in mining and matches the required target voltage. The AVR 74 may either intermittently receive a construction to extract and control groundwater at worksites (commonly known as an automatic basis such that the alternating current output from the alternator 72 “dewatering” applications). The electric motor 73 may be powered by an alternating voltage from the second controller 82 and operatively controls the excitation current on current (AC) and may comprise an AC induction or synchronous motor. regulator 74 may be an automatic voltage regulator (AVR) that receives a target output

[0039] the As ofdepicted voltage in FIG.current the alternating 3, thethat engine 12 included is generated by the in the system alternator 70voltage 72. The may comprise a reciprocating An internal excitation current, combustion typically a direct engine current, 12, such flowing as athediesel through or petrol field coils engine, determines that operatively

[0040] drives the The alternator 72 alternator 72antoexcitation may comprise produce system AC electrical provided power. with fieldThe throttle coils.

controller 76 may comprise an actuated governor or, as depicted in FIG. 3, an engine the alternating current generated by the alternator 72. control unit (ECU) 22 that controls electrically the fuel supplied to the engine 12 to to the ECU 22 to vary the speed of the engine12 and, consequently, the frequency of control the speed of the engine 12. The second controller 82 may send control signals control the speed of the engine 12. The second controller 82 may send control signals to the ECU 22 to vary the speed of the engine12 and, consequently, the frequency of control unit (ECU) 22 that controls electrically the fuel supplied to the engine 12 to the alternating current generated by the alternator 72. controller 76 may comprise an actuated governor or, as depicted in FIG. 3, an engine

[0040] The drives operatively alternator 72 may comprise the alternator an excitation 72 to produce system AC electrical provided power. with field The throttle coils. An excitation internal reciprocating current, typically a direct combustion enginecurrent, 12, suchflowing through as a diesel or the fieldengine, petrol coils determines that

the voltage

[0039] of the alternating As depicted current in FIG. 3, the that12isincluded engine generated by the in the alternator system 70 may 72. The voltage comprise a

regulator 74 may be an automatic voltage regulator (AVR) that receives a target output current (AC) and may comprise an AC induction or synchronous motor. voltage from the second controller 82 and operatively controls the excitation current on "dewatering" applications). The electric motor 73 may be powered by an alternating an automatic basis such that the alternating current output from the alternator 72 construction to extract and control groundwater at worksites (commonly known as matches the required target voltage. The AVR 74 may either intermittently receive a from wellbores (commonly known as "artificial lift" applications) and in mining and sequence of target output voltages from the second controller 82 over time, or the AVR submersible pumps used in the oil and gas industry to pump oil and oil/water mixtures 74 may receive a continuous signal from the second controller 82 representing the target The submersible pump 90 may comprise a centrifugal pump as commonly used in voltage to be achieved. The AVR 74 and alternator 72 may be configured such that an shown connected to an electric motor 73 that operatively drives a submersible pump 90. output voltage falling within a wide range may be produced by the generator system 70. pump, a fan or a conveyor system. In the example depicted, the generator system 70 is For example, the generator system 12 may be configured to produce an output voltage electric motor 73 may drive a pump, such as a centrifugal or positive displacement of between 400V and 4,800V to allow the system 70 to power and control submersible mechanism that needs to be operated on a variable speed basis. For example, the

[0038] More particularly, the electric motor 73 may operatively drive any device or

pumps 30 used in a wide range of applications. This includes, for example: (i) for groundwater control applications in mining and construction, where output voltages of between 400V – 1100V are often required to power submersible pumps deployed in wellbores up to 500m deep; and (ii) for artificial lift applications in the petroleum industry, maintenance personnel. where higher output voltages up to 4,800V may be required to power submersible a housing of the generator system 70 such that it is not accessible by operators and pumps deployed in wellbores up to or in excess of 3,000m deep. The system 70 may be that allows the key 92 to be entered. The second controller 82 may be deployed inside provided with a step-up or a step-down transformer (not shown) connected between the 2024203422

control panel may include its own UI device, such as an interactive touchscreen display, generator system 70 and the motor 73 if the range of voltages that can be supplied to a control panel that is attached to an external surface of a housing of the system 70. The the motor 73 needs to be changed. controller 82 via the first controller 80 and the first controller 80 may be integrated within

[0041] The wireless secondmeans. connection controller In one 82 may the example, comprise key 92 discrete control may be entered logic into that, when the second

executing,(UI) interface causes thethat device second controller 82 is connectable to vary to the thecontroller second motor’s 7382speed using in a accordance wired or

with theThecontrol

[0042] key 92signals may be issued enteredby thethe into firstsecond controller 80 by, as controller 82 described above — user using an electronic i.e., by using the ECU 76 and AVR 74 to control the frequency and voltage of the alternating of operation wherein the electric motor 73 is caused to operate at a fixed speed only current supplied to the motor 73. This control logic may be protected such that the When the control logic is disabled, the second controller 82 may execute a second mode control logic can be selectively enabled and disabled. For example, the second provides for variable speed control of the motor 73 in the manner described above. controller 82 may be configured such that the control logic is enabled and executed by second controller 82. When the control logic is enabled, the second controller 82 the second controller 82 only once a unique digital key 92 has been input into the the second controller 82 only once a unique digital key 92 has been input into the second controller 82. When the control logic is enabled, the second controller 82 controller 82 may be configured such that the control logic is enabled and executed by provides for variable speed control of the motor 73 in the manner described above. control logic can be selectively enabled and disabled. For example, the second When the control logic is disabled, the second controller 82 may execute a second mode current supplied to the motor 73. This control logic may be protected such that the of operation wherein the electric motor 73 is caused to operate at a fixed speed only. using the ECU 76 and AVR 74 to control the frequency and voltage of the alternating

[0042] with the The keysignals control 92 may be entered issued intocontroller by the first the second controller 80 by, 82 using as described ani.e., above - electronic by user interface (UI) executing, device causes that iscontroller the second connectable to vary 82 to the second controller the motor's 82 in 73 speed using a wired accordance or wirelessThe

[0041] connection means. In one second controller example, 82 may the key comprise 92 may discrete be entered control into logic the second that, when

controller 82 via the first controller 80 and the first controller 80 may be integrated within the motor 73 needs to be changed. a control panel that is attached to an external surface of a housing of the system 70. The generator system 70 and the motor 73 if the range of voltages that can be supplied to control panel may include its own UI device, such as an interactive touchscreen display, provided with a step-up or a step-down transformer (not shown) connected between the that allows the key 92 to be entered. The second controller 82 may be deployed inside pumps deployed in wellbores up to or in excess of 3,000m deep. The system 70 may be a housing of the generator system 70 such that it is not accessible by operators and where higher output voltages up to 4,800V may be required to power submersible maintenance personnel. wellbores up to 500m deep; and (ii) for artificial lift applications in the petroleum industry,

between 400V - 1100V are often required to power submersible pumps deployed in

groundwater control applications in mining and construction, where output voltages of

pumps 30 used in a wide range of applications. This includes, for example: (i) for

[0043] In further examples, the second controller 82 may include functionality that allows the protected control logic to be disabled even when the correct key 92 has been maximum operating temperature of the motor 73 or a maximum mechanical vibration entered into the second controller 82. In one example, the second controller 82 may set point may relate to an operating condition of the motor 73, such as a fixed or disable the control logic and run the fixed-speed operation mode when it receives an respectively, such as maximum fluid pressure, flow rate or level. In other examples, the explicit instruction to do so from a remote control center or device connected to the particular pump operating or environmental parameter must not exceed or fall below system 70. In another example, the second controller 82 may disable the control logic maintained by the pump 90, the set point may be a maximum or minimum value that a automatically when the second controller 82 detects that the first controller 80 has either 2024203422

pump 90 or in a tube connected to such fluid outlet. Instead of a fixed value to be stopped functioning correctly during use or has been disconnected from the second the pump 90 is deployed in. The fluid flow rate may be a flow rate in a fluid outlet of the controller 82. outlet of the pump 90 or at a particular position within a column of fluid in a wellbore that

[0044] Thebymotor maintained control the pump 90. signals that The fluid are issued pressure byathe may be first controller pressure 80 to at an inlet or the second at an

controller fluid 82 may pressure, (ii) acomprise a target desired fluid speed flow rate of the and/or pump’s (iii) motor a desired fluid73 thatthat level is toisbe to achieved be

by themay point second controller relate 82 usingenvironment to an operating the controlof logic the described above. pump 90 such The system as either 70 may (i) a desired

be For configured example, in such that the where applications second the controller 82 either motor 73 drives receives apump a submersible sequence 90, the of target set

speeds speed thatatisintervals from sent to the thecontroller second first controller 82 that80 overthe causes time, set or receives point a continuous to be maintained. signal representingreceived information the target motor from speed.78, the first controller 80 determines the target the sensor

or pump 90. The first controller 80 may be configured such that in response to the

[0045] The first controller 80 may also comprise a storage device which stores at least one set point relating to the operating environment or condition of the electric motor 73 one set point relating to the operating environment or condition of the electric motor 73

[0045] The first controller 80 may also comprise a storage device which stores at least or pump 90. The first controller 80 may be configured such that in response to the information received representing the targetfrom thespeed. motor sensor 78, the first controller 80 determines the target speedatthat speeds is sentfrom intervals to the second the first controller controller 82 that 80 over time,causes the set or receives point to signal a continuous be maintained. Forconfigured be example, such in applications wherecontroller that the second the motor8273either drivesreceives a submersible pump a sequence 90, the of target set point by themay relate second to an operating controller 82 using environment of thedescribed the control logic pump 90above. such as Theeither (i) 70 system a desired may

fluid pressure, controller (ii)comprise 82 may a desired fluid flow a target rate speed of and/or (iii) motor the pump's a desired fluid 73 that islevel to bethat is to be achieved

maintained by the

[0044] The motor pumpsignals control 90. The fluid that arepressure issued bymay the be a pressure first at 80 controller an to inlet theorsecond at an outlet of the pump 90 or at a particular position within a column of fluid in a wellbore that controller 82. the pump 90 is deployed in. The fluid flow rate may be a flow rate in a fluid outlet of the stopped functioning correctly during use or has been disconnected from the second pump 90 or in a tube connected to such fluid outlet. Instead of a fixed value to be automatically when the second controller 82 detects that the first controller 80 has either maintained by the pump 90, the set point may be a maximum or minimum value that a system 70. In another example, the second controller 82 may disable the control logic particular pump operating or environmental parameter must not exceed or fall below explicit instruction to do so from a remote control center or device connected to the respectively, such as maximum fluid pressure, flow rate or level. In other examples, the disable the control logic and run the fixed-speed operation mode when it receives an set point may relate to an operating condition of the motor 73, such as a fixed or entered into the second controller 82. In one example, the second controller 82 may maximum operating temperature of the motor 73 or a maximum mechanical vibration allows the protected control logic to be disabled even when the correct key 92 has been

[0043] In further examples, the second controller 82 may include functionality that

level. The first controller 80 may store and maintain any one of the foregoing set points. In other examples, the first controller 80 may store a set consisting of two or more of the encoding arithmetic, logical and/or I/O operations. The processor may, for example, foregoing set points (in any combination) and operate to maintain one of the set points processor will typically comprise a device that is capable of executing instructions included in the set selectively at any one point in time. The relevant set point in the set examples where one (or both) of the controllers 80, 82 comprises a processor, each that is maintained may be selected by an operator of the system 70 using a user input or PLAs) connected together via a network, bus or similar communications system. In device connected to the system 70. In other examples, the first controller 80 may electronic controller device or multiple controller devices (including multiple processors comprise logic that determines the relevant set point that needs to be maintained 2024203422

electronic controller device. Each controller 80, 82 may comprise a single integrated automatically based on information received from the sensor 78, or from a set of sensors programmable logic controller (PLC), a programmable logic array (PLA) or similar connected to the first controller 80.

[0047] The first and second controllers 80, 82 may each comprise a processor, a

[0046] The sensor 78 may comprise a fluid pressure sensor, fluid flow rate sensor, fluid 80, such as between a maximum and a minimum wellbore water or fluid level. level sensor, temperature sensor, mechanical vibration sensor or any other type of environmental parameter is kept between a range of values stored in the first controller sensor that provides information allowing the relevant set point to be maintained. In controlled by the first controller 80 such that a particular pump operating or examples where a fluid level set point needs to be maintained, such as a level of water versa if the fluid level falls below the set level). In other examples, the motor 73 may be in a borehole for dewatering applications, the sensor 78 may be a hydrostatic sensor submersible pump 90 works harder to bring the fluid level down to the set level (and vice that operates by measuring a fluid pressure indicative of the relevant fluid level. The controller 80 may automatically increase the speed of the motor 73 such that the sensor 78 may also be a guided radar device, an ultrasonic device, a magnetostrictive such examples, if the fluid level in the borehole rises above the set level in use, the first level transmitter or a conductivity sensor when required to measure a fluid level. In level transmitter or a conductivity sensor when required to measure a fluid level. In such examples, if the fluid level in the borehole rises above the set level in use, the first sensor 78 may also be a guided radar device, an ultrasonic device, a magnetostrictive controller 80 may automatically increase the speed of the motor 73 such that the that operates by measuring a fluid pressure indicative of the relevant fluid level. The submersible pump 90 works harder to bring the fluid level down to the set level (and vice in a borehole for dewatering applications, the sensor 78 may be a hydrostatic sensor versa if the fluid level falls below the set level). In other examples, the motor 73 may be examples where a fluid level set point needs to be maintained, such as a level of water controlled by the first controller 80 such that a particular pump operating or sensor that provides information allowing the relevant set point to be maintained. In environmental parameter is kept between a range of values stored in the first controller level sensor, temperature sensor, mechanical vibration sensor or any other type of 80, such as between a maximum and a minimum wellbore water or fluid level.

[0046] The sensor 78 may comprise a fluid pressure sensor, fluid flow rate sensor, fluid

[0047] The first and second controllers 80, 82 may each comprise a processor, a connected to the first controller 80. programmable logic controller (PLC), a programmable logic array (PLA) or similar automatically based on information received from the sensor 78, or from a set of sensors electronic controller device. Each controller 80, 82 may comprise a single integrated comprise logic that determines the relevant set point that needs to be maintained electronic controller device or multiple controller devices (including multiple processors device connected to the system 70. In other examples, the first controller 80 may or PLAs) connected together via a network, bus or similar communications system. In that is maintained may be selected by an operator of the system 70 using a user input examples where one (or both) of the controllers 80, 82 comprises a processor, each included in the set selectively at any one point in time. The relevant set point in the set processor will typically comprise a device that is capable of executing instructions foregoing set points (in any combination) and operate to maintain one of the set points encoding arithmetic, logical and/or I/O operations. The processor may, for example, In other examples, the first controller 80 may store a set consisting of two or more of the

level. The first controller 80 may store and maintain any one of the foregoing set points.

comprise an arithmetic logic unit (ALU), a control unit and a plurality of registers. The processor may comprise a single core processor capable of executing one instruction at a time (or process a single pipeline of instructions) or a multi-core processor which simultaneously altogether when executes multiple the maximum instructions. temperature value is The processor exceeded. may be implemented as a single integrated controller circuit, 80. The first two or80 more controller integrated may also circuits, be configured orthe to stop may be a motor electric component 73 of a multi-chip or resistor, module. similar temperature measuring device, communicatively coupled to the first

temperature sensor may, for example, comprise a positive temperature coefficient

[0048] A storage device of the first controller 80 may comprise a volatile or non-volatile 2024203422

or exceeded a particular maximum value set by an operator of the system 70. The memory device, such as RAM, ROM, EEPROM or flash memory, a magnetic or optical sensor installed in the motor 73 indicates that the temperature of the motor 73 has met disk, a network attached storage (NAS) device or any other device capable of storing feature wherein the speed of the electric motor 73 is reduced when a temperature data. The storage device may be integral with the first controller 80 or it may be an

[0050] In one example, the first controller 80 may be configured to implement a safety external storage device in communication with the first controller 80 via a wired or wireless (kW). kilowatts communication means such as, for example, a USB cable, optical fibre, ethernet orthe industry, WiFi. system 70 may be capable of supplying a total of between 50 and 1,500

submersible pump 90 deployed in a wellbore for artificial lift purposes in the petroleum

[0049] The engine 12 and alternator 72 may each be sized and rated such that the 500 kilowatts (kW) of power to the electric motor 73. In examples where the system 70 is capable of supplying the necessary power required by the electric motor 73 control purposes, the system 70 may be configured to supply a total of between 50 and based on its speed and torque requirements. For example, where the electric motor 73 is used to drive a submersible pump 90 that is deployed in a wellbore for groundwater is used to drive a submersible pump 90 that is deployed in a wellbore for groundwater based on its speed and torque requirements. For example, where the electric motor 73 control purposes, the system 70 may be configured to supply a total of between 50 and system 70 is capable of supplying the necessary power required by the electric motor 73 500 kilowatts (kW) of power to the electric motor 73. In examples where the

[0049] The engine 12 and alternator 72 may each be sized and rated such that the submersible pump 90 deployed in a wellbore for artificial lift purposes in the petroleum industry,orthe ethernet system WiFi. 70 may be capable of supplying a total of between 50 and 1,500 kilowatts (kW). wireless communication means such as, for example, a USB cable, optical fibre,

external storage device in communication with the first controller 80 via a wired or

[0050] In one example, the first controller 80 may be configured to implement a safety data. The storage device may be integral with the first controller 80 or it may be an feature wherein the speed of the electric motor 73 is reduced when a temperature disk, a network attached storage (NAS) device or any other device capable of storing sensor installed in the motor 73 indicates that the temperature of the motor 73 has met memory device, such as RAM, ROM, EEPROM or flash memory, a magnetic or optical or exceeded a particular maximum value set by an operator of the system 70. The

[0048] A storage device of the first controller 80 may comprise a volatile or non-volatile temperature sensor may, for example, comprise a positive temperature coefficient resistor, ormodule. multi-chip similar temperature measuring device, communicatively coupled to the first controller single 80. Thecircuit, integrated first controller 80 may two or more also be circuits, integrated configuredortomay stop bethe electric motor a component of a 73 altogether when simultaneously the maximum executes multipletemperature value instructions. The is exceeded. processor may be implemented as a

a time (or process a single pipeline of instructions) or a multi-core processor which

processor may comprise a single core processor capable of executing one instruction at

comprise an arithmetic logic unit (ALU), a control unit and a plurality of registers. The

[0051] The control signals that are issued by the first controller 80 to the second controller 82 may comprise digital control signals. For example, the system 70 may comprise centre a communications during use. bus connecting the two controllers 80, 82 together and the control flow signals reading, is may comprise displayed digitaldisplay on a visual machine code of the instructions remote transmitted control device via or control the communications bus. In other examples, the two controllers 80, 82 may be connected measured and/or determined using the sensor 78, such as a current pressure, level or together 70. via an internal In examples, packet-switched the system network 70 may be configured andthat such thethe control signals that information may is comprise data packets human operatorstransmitted over theand/or may use to control network. Thetheinternal monitor network may first controller be the 80 and a controller system 2024203422

area network connectable to that implements a remote an industry control centre standard that contains message-based various protocolthat UI control devices such as CANbus the or 70 system Modbus. In other examples, more generally. the first controller In other examples, the first 80controller may be configured 80 may beto issue analogue control signals to the second controller 82. The second controller 82 a human operator to set, activate and monitor the operation of the first controller 80 and

may also be connected to the throttle controller 76 and to the voltage regulator 74 using comprises a touch-screen visual display, or similar electronic user interface, that enables

any one of the controller foregoing 80 may communication be connectable to anmeans. The second individual controllerdevice remote control 82 may96also be that configured to sendordiagnostic Internet, cellular information mobile network relating or other to or computer operation digital of the throttle network. controller The first 76 and/orthe enables voltage remotecontroller control 74 to the96first device to controller 80, and be connected via the diagnostic a LAN, information WAN, WLAN, the may be used by communications the first94controller interface 80 to may comprise determine a radio the motor transceiver control interface or network signals issued that to the first the second controller8082. controller to aThe second remote controller control center82 or may send device 96.the Fordiagnostic information example, the to the first

[0052] The controller system 70 80 mayusing any one of also comprise the foregoing communication a communications interface 94 formeans. connecting

[0052] to The system the first 70 may controller alsoany 80 using comprise one of a communications the interface means. foregoing communication 94 for connecting the first controller 80 to a remote control center or device 96. For example, the the second controller 82. The second controller 82 may send the diagnostic information communications may be used by theinterface 94 may comprise first controller a radiothe 80 to determine transceiver or network motor control signalsinterface that issued to enables the remote control device 96 to be connected via a LAN, WAN, WLAN, the 76 and/or voltage controller 74 to the first controller 80, and the diagnostic information

Internet, cellular or mobile network or other computer or digital network. configured to send diagnostic information relating to operation of the throttle controller The first controller any 80 foregoing one of the may be communication connectable to an The means. individual remote control second controller 82 maydevice also be 96 that comprises may also be aconnected touch-screen visual to the display, throttle or similar controller 76 electronic and to the user interface, voltage that74 regulator enables using a human issue operator analogue to set, control activate signals andsecond to the monitor the operation controller of second 82. The the firstcontroller controller82 80 and the system CANbus 70 more or Modbus. generally. In other examples, In theother firstexamples, controller the firstbecontroller 80 may configured80 to may be connectable area to aimplements network that remote control centrestandard an industry that contains variousprotocol message-based UI control such devices as that human data operators packets may use transmitted to the over control and/orThe network. monitor thenetwork internal first controller may be a 80controller and the system 70. In examples, together the system via an internal 70 may network packet-switched be configured and the such that control the information signals that may comprise is measured and/or communications bus.determined using the In other examples, thesensor 78, such as two controllers 80,a82 current may bepressure, connected level or flow reading, control signalsismay displayed comprise on a visual digital display machine code of the remotetransmitted instructions control device or via the control centre during comprise use. a communications bus connecting the two controllers 80, 82 together and the

controller 82 may comprise digital control signals. For example, the system 70 may

[0051] The control signals that are issued by the first controller 80 to the second

[0053] The first controller 80 may also be configured to transmit data relating to operating conditions or parameters of the system 70 to the remote control center or device 96. This enables the operation and performance of the system 70 to be monitored the circuit and assessed breaker during use. in accordance The first controller with programmed 80 may logic executed alsofirst by the be configured controllerto operate in accordance communicatively with connected control to the instructions circuit received breaker and from thetoremote be configured control monitor center and reset or device much 96 from current via the the communications generator system interface 70 during 94. use.For The example, the user80control first controller may becenter or device system 96 the 70 and mayelectric be usedmotor by an73operator to setthe that prevents andelectric store a motor particular set drawing 73 from point ontoo the 2024203422

first controller

[0055] A circuit80breaker and cause (not the first may shown) controller 80 to operate be interconnected in accordance between with the generator a control mode corresponding to the set point. For example, if the motor 73 is used to drive a submersible pump 90, the operator may input a constant water flow rate in the first predetermined level stored in the controller 82.

controller 80 controller 80 and cause that determines the first the controller 80 toinenter level of fuel into a pump the second control fuel tank mode 16 is wherein below a the speed other of the examples, an pump 90 notification alert or is regulated may by the system be sent 70 remote to the to maintain devicethe 96 constant when the flow rate duringofuse. operation the system 70 that is tracked and recorded by the first controller 80. In

make such predictions based on the historical mode of operation and/or duration of

[0054] The first controller 80 may also be configured to transmit warnings or alerts conditions of the system 70 may occur or arise in the future. The first controller 80 may relating to operating conditions of the system 70 to the remote control center or device configured to transmit warnings or alerts when it predicts when particular operating 96 via the communications interface 94. For example, the first controller 80 may operating range stored on the first controller 80. The first controller 80 may also be transmit an alert when the temperature of the electric motor 73 exceeds a particular transmit an alert when the temperature of the electric motor 73 exceeds a particular operating range stored on the first controller 80. The first controller 80 may also be 96 via the communications interface 94. For example, the first controller 80 may configured to transmit warnings or alerts when it predicts when particular operating relating to operating conditions of the system 70 to the remote control center or device conditions of the system 70 may occur or arise in the future. The first controller 80 may

[0054] The first controller 80 may also be configured to transmit warnings or alerts make such predictions based on the historical mode of operation and/or duration of operation of the system 70 that is tracked and recorded by the first controller 80. In rate during use.

other the examples, speed an alert of the pump 90 isorregulated notification maysystem by the be sent to the 70 to remote maintain thedevice 96 flow constant when the controller 80 controller determines 80 and cause thethat thecontroller first level of fuel 80 toinenter the second fuel control into a pump tank 16mode is below whereina predetermined submersible pumplevel 90, stored in the may the operator controller input a82. constant water flow rate in the first

mode corresponding to the set point. For example, if the motor 73 is used to drive a

[0055] A circuit breaker (not shown) may be interconnected between the generator first controller 80 and cause the first controller 80 to operate in accordance with a control

system or 7096and device may the be electric used by motor 73 that an operator toprevents the electric set and store motor 73 a particular setfrom drawing point on the too much or current device from 96 via the the generator system communications 70 94. interface during For use. Thethe example, firstuser controller control80 may center be communicatively operate connected in accordance to the instructions with control circuit breaker and befrom received configured to monitor the remote control and reset center the circuitand monitored breaker in accordance assessed during use. with programmed The first logic controller 80 executed byconfigured may also be the first controller to

device 96. This enables the operation and performance of the system 70 to be

operating conditions or parameters of the system 70 to the remote control center or

[0053] The first controller 80 may also be configured to transmit data relating to

80 and/or operator instructions manually issued using the remote control centre or device 96.

[0056] As described functionality. in the foregoing paragraphs, the motor control methodology that is digital key 92 to unlock and use the more-sophisticated variable speed motor implemented by the system 70 is split into two functional control processes executed by twolock to separate, cooperating the system system 70 in a fixed speedcontrollers 80, allow mode and only 82 respectively. That an end user who has is, thethe first controller 80 controller 80.serves asallow, This may a master for controller example, athat implements supplier a controlof or manufacturer loop thetosystem (i) receive 70 2024203422

information using fromkey a digital the92sensor 78, (ii) determine independently whether of the control logicthe motor 73 by implemented needs to run the first faster or slower (iii) Thebased onlogic control the information implementedand (iii) send by the seconda controller control signal to the 82 may be second controller protected

82 representing a desired motor speed. The second controller 82, in turn, serves as a slave controller operate the motorthat controls 73 on a fixedthe ECU speed 76 and basis thethe during AVR 74 based relevant onperiod; update the control signal such 82 that the continues to motor operate73 theiselectric caused motor to run 73.at the desired Again, speed. the second Implementing controller 82 may this cascade to control be updated methodology during using two use, the firmware separate can be updated system controllers live while 80,controller the second 82 provides several If (ii) practical advantages, firmware including: embodying the control logic executed by the first controller 80 needs

(i) during If the the first controller relevant 80 period; maintenance ceases to operate correctly during use, then the second controller operate the82 may73 motor continue but on atofixed operate thebasis, speed electric motor rather 73 awhile than the first variable controller speed basis, 80 is being repaired being repairedororreplaced. replaced.ForFor example, example, the second the second controller controller 82 may 82 may continue continue to to operate the controller motor 82 may 73 but continue on a fixed to operate speedmotor the electric basis, rather 73 while thethan firstacontroller variable 80 speed is basis, during the (i) relevant If the first maintenance controller 80period; ceases to operate correctly during use, then the second

(ii) several If firmware practical embodying advantages, the control including: logic executed by the first controller 80 needs to be updated cascade control during use, the methodology firmware using can be two separate updated system live while controllers 80,the 82 second providescontroller

such that the motor 73 is caused to run at the desired speed. Implementing this 82 continues to operate the electric motor 73. Again, the second controller 82 may operate slave the motor controller 73 on that a fixedthe controls speed basis ECU 76 and during the AVRthe 74 relevant based onupdate period; the control signal

82 representing a desired motor speed. The second controller 82, in turn, serves as a

(iii)slowerThe or basedcontrol logic implemented on the information by athe and (iii) send second control controller signal 82 controller to the second may be protected using a digital information key sensor from the 92 independently of the 78, (ii) determine control whether thelogic motorimplemented by faster 73 needs to run the first controller 80. controller This may 80 serves as a allow, masterfor example,that controller a supplier or manufacturer implements ofto a control loop the(i) system 70 receive

to lock two the system separate, 70 in system cooperating a fixedcontrollers speed mode80, and only allow anThat 82 respectively. endis, user thewho has first the digital key by92thetosystem implemented unlock and 70 is useinto split thetwomore-sophisticated variable executed functional control processes speed motor by

functionality.

[0056] As described in the foregoing paragraphs, the motor control methodology that is

device 96.

80 and/or operator instructions manually issued using the remote control centre or

[0057] In other examples, the second controller 82 may be configured to issue control instructions to the ECU 76 but not to the AVR 74. The AVR 74 may automatically control the voltage of the output current of the alternator 72 based on the frequency of the output alternating current, or based on the rotational frequency of the drive axle of the engine 12 driving the alternator 72. In such examples, the AVR 74 may control the output current such that the V/f ratio required by the motor 73 is maintained. 2024203422

[0058] For the purpose of this specification, the word “comprising” means “including but not limited to”, and the word "comprises" has a corresponding meaning.

[0059] The above embodiments have been described by way of example only and modifications are possible within the scope of the claims that follow.

modifications are possible within the scope of the claims that follow.

[0059] The above embodiments have been described by way of example only and

not limited to", and the word "comprises" has a corresponding meaning.

[0058] For the purpose of this specification, the word "comprising" means "including but

output current such that the V/f ratio required by the motor 73 is maintained.

engine 12 driving the alternator 72. In such examples, the AVR 74 may control the

output alternating current, or based on the rotational frequency of the drive axle of the

the voltage of the output current of the alternator 72 based on the frequency of the

instructions to the ECU 76 but not to the AVR 74. The AVR 74 may automatically control

[0057] In other examples, the second controller 82 may be configured to issue control

21 10 Nov 2024 2024203422 10 Nov 2024

Claims Claims

1. 1. A system A systemforfor supplying supplying fuel fuel toengine to an an engine of an electrical of an electrical generator, generator, the the system system comprising: comprising:

a first fuel a first fuel tank tank and and aasecond secondfuelfuel tank; tank;

an actuable an actuable valve valve assembly assembly that that is is fluidly fluidly connected connected to theand to the engine engine to theand to the first first

fuel tank, fuel tank,wherein wherein the the actuable actuable valve valve assembly is also assembly is also detachably detachablyfluidly fluidly connectable to connectable to 2024203422

the second the fuel tank second fuel tank and andis is operatively operatively switchable switchable between between atatleast least aa first first and andaasecond second

operating mode,wherein operating mode, whereinininthe thefirst first operating operating mode theactuable mode the actuablevalve valveassembly assemblyis is

configured configured toto supply supply the the fuelfuel fromfrom the first the first fuelfuel tanktank to engine, to the the engine, and wherein and wherein in the in the second operatingmode second operating modethethe actuable actuable valve valve assembly assembly is configured is configured to supply to supply the the fuelfuel

from the from the second secondfuel fuel tank tank to to the the engine; engine;

a sensorconfigured a sensor configured to output to output sensor sensor information information corresponding corresponding to fuel to a level of a level of fuel in in the second the second fuel fuel tank; tank;

a a system controller connected system controller tothe connected to the actuable actuablevalve valveassembly assembly and and to to the the sensor; sensor;

and and a a communications interfacefor communications interface forconnecting connectingthe thesystem system controllertotoaaremote controller remote control centerorordevice control center device by by a cellular a cellular network; network;

whereinthethe wherein system system controller controller is configured is configured such such that: that: whenthe when thesensor sensorisisdisconnected disconnected from from the the system system controller controller and/or and/or when when the the

second fuel tank second fuel tank is is fluidly fluidlydisconnected disconnected from from the the actuable actuable valve valve assembly, the system assembly, the system controller controller causes causes the the actuable valve assembly actuable valve assemblytotooperate operateininthe the first first operating operatingmode mode

only; only;

whenthe when thesensor sensorisisconnected connectedtoto thesystem the system controllerand controller andthe thesecond second fuel fuel tank tank

is is fluidly fluidlyconnected connectedto tothe theactuable actuablevalve valveassembly, assembly, in inresponse response to to the the sensor sensor

information information the the system controller causes system controller the actuable causes the actuablevalve valveassembly assemblytoto operate operate ininthe the second operatingmode second operating mode when when a level a level of of fuel fuel ininthe thesecond second fueltank fuel tankisisat at or or above above aa

predetermined level predetermined level stored stored in system in the the system controller, controller, and to in and to operate operate in the the first first operating operating

mode when mode when thethe levelofoffuel level fuel is is below the predetermined below the predeterminedlevel; level;and and the system the system controller controller sends sends an alert an alert or notification or notification over over the the cellular cellular networknetwork to the to the remote control center remote control center or or device by the device by the communications communications interfacewhen interface when thethe system system

controller determines controller determines that that the the level level of fuel of fuel in the in the second second fuelistank fuel tank is the below below the predetermined level. predetermined level.

2. 2. Thesystem The systemaccording according to to claim1,1,wherein claim wherein thesystem the system comprises: comprises:

22 10 Nov 2024 2024203422 10 Nov 2024

a first hydraulic a first fuel circuit hydraulic fuel circuit for for circulating the fuel circulating the fuel between between thethe first first fuel fuel tank tank andand

the engine; the engine;

a second a second hydraulic hydraulic fuelfuel circuit circuit forfor circulating circulating the the fuelfuel between between the second the second fuel fuel tank and tank the engine; and the engine; and and one ormore one or more fuel fuel injectors injectors for for injecting injecting the the fuelfuel intointo the the engine engine from from the theand first first and the second the hydraulicfuel second hydraulic fuel circuit, circuit,and andwherein wherein the the actuable actuable valve valve assembly is configured assembly is configured such thatininthe such that thefirst first and andthe thesecond second operating operating mode mode the fuelthe fuel is circulated is circulated under pressure under pressure 2024203422

around, respectively, around, respectively, thethe first first andand the the second second hydraulic hydraulic fuel circuit. fuel circuit.

3. 3. Thesystem The systemaccording accordingto to claim2,2,wherein claim wherein theactuable the actuable valve valve assembly assembly

comprises comprises an an input input fuelfuel lineline and and an output an output fuelarranged fuel line line arranged tothe to supply supply theand fuel to fuel to and fromthe from thefuel fuelinjectors injectorsrespectively, respectively, and and wherein wherein the hydraulic the first first hydraulic fuel circuit fuel circuit is provided is provided

by: by:

the input the inputand andthethe output output fuelfuel line; line;

a first fuel a first fuelsupply line arranged supply line arranged to to supply supply the the fuelfuel fromfrom the first the first fuel fuel tank tank to the to the

actuable valve assembly; actuable valve assembly;and and a first fuel a first fuelreturn return line line arranged arranged totoreturn return the the fuel fuel from from the the actuable actuable valve valve

assembly assembly to to thethe firstfuel first fueltank. tank.

4. 4. Thesystem The system according according to claim to claim 3, wherein 3, wherein thehydraulic the second second fuel hydraulic circuitfuel is circuit is provided by: provided by:

the input the inputand andthethe output output fuelfuel line; line;

a second a second fuel fuel supply supply lineline arranged arranged to supply to supply the the fuel fuel from from the thefuel second second fuel tank to tank to

the actuable the valve assembly; actuable valve assembly;and and a second a second fuel fuel return return line line arranged arranged to return to return thefrom the fuel fuel the from the actuable actuable valve valve assembly assembly totothe thesecond secondfuel fueltank. tank.

5. 5. Thesystem The systemaccording accordingto to claim4,4,wherein claim whereinthe theactuable actuable valve valve assembly assembly is is configured suchthat: configured such that: in in the first operating the first mode, operating mode, thethe actuable actuable valvevalve assembly assembly fluidly connects fluidly connects the first the first

fuel supply fuel supplyline linetotothe theinput inputfuel fuelline, line,and andthethe firstfuel first fuelreturn return linetotothethe line output output fuelfuel line; line;

and and

23 10 Nov 2024 2024203422 10 Nov 2024

in in the the second operating mode, second operating mode,the theactuable actuablevalve valveassembly assembly fluidlyconnects fluidly connects the the

second fuel second fuel supply supply lineline to the to the input input fuelfuel line, line, and and the second the second fuel return fuel return line to line to the output the output

fuel line. fuel line.

6. 6. Thesystem The systemaccording accordingto to any any one one of of thethepreceding preceding claims, claims, wherein wherein thethe sensor sensor is is detachably connectable detachably connectable to thetosystem the system controller controller by aline by a control control that line that is provided is provided with a with a plug plug and socketarrangement. and socket arrangement. 2024203422

7. 7. Thesystem The systemaccording accordingto to any any one one of of thethepreceding preceding claims, claims, wherein wherein thethe sensor sensor is is deployedinside deployed inside and andattached attachedtotothe thesecond second fueltank. fuel tank.

8. 8. Thesystem The systemaccording accordingto to any any one one of of thethepreceding preceding claims, claims, wherein wherein thethe system system

comprises comprises a asecond second sensor sensor connected connected to the to the system system controller controller thatthat is is configured configured to to

output sensor output sensor information information corresponding corresponding to anofamount to an amount of fuel in fuel available available the firstinfuel the first fuel tank, and tank, andwherein wherein the the system system controller controller is configured is configured to stop to stop supplying supplying fuelfirst fuel from the from the first fuel tank fuel tank to tothe theengine engine when the system when the systemcontroller controller determines, determines,based basedononthe thesensor sensor information output information output by by the the second second sensor, sensor, that a that levelaoflevel fuel of in fuel in thefuel the first firsttank fuelistank is at or at or

below below aa predetermined predetermined levelstored level storedininthe the system systemcontroller. controller.

9. 9. Thesystem The systemaccording accordingto to any any one one of of thethepreceding preceding claims, claims, wherein: wherein:

the system the system comprises comprises at least at least one additional one additional fuel fuel tank tank detachably detachably fluidly fluidly connectable to the connectable to the actuable actuablevalve valveassembly, assembly,and and anan additionalsensor additional sensor connected connected to the to the

system controller that system controller that is isconfigured configuredto tooutput outputsensor sensorinformation informationcorresponding to an corresponding to an

amount amount of of fuel fuel available available in the in the additional additional fuel fuel tank;tank; and and

the system the controller causes system controller the actuable causes the actuablevalve valveassembly assemblyto to supply supply thefuel the fueltoto the engine the fromthe engine from the additional additional fuel fuel tank tank when the sensor when the sensorinformation information output outputby bythe the additional sensor additional sensor indicates indicates thatthat a level a level of fuel of fuel in the in the additional additional fuel fuel tank tank is at is or at or above above a a predetermined level predetermined level stored stored in system in the the system controller. controller.

10. A generator 10. A generator system,comprising: system, comprising: an engine; an engine;

the system the accordingtotoany system according anyone oneofofthe thepreceding precedingclaims claims forsupplying for supplyingfuel fuelto to the the engine; engine;

24 10 Nov 2024 2024203422 10 Nov 2024

an alternatordriven an alternator drivenby by thethe engine engine to produce to produce an alternating an alternating current, current, the the alternator comprising alternator comprising a voltage a voltage regulator regulator for controlling for controlling a voltage a voltage of the alternating of the alternating

current; current;

a throttle controller a throttle for controlling controller for controllingaarotational rotationalspeed speed of the of the engine engine and, therefore, and, therefore,

frequency frequency of of thethe alternating alternating current; current; and and a generator a generator controller controller configured configured to control to control the throttle the throttle controller controller and and the the voltage voltage

regulator tocontrol regulator to controlthe thefrequency frequency and voltage and voltage of the of the alternating alternating current current respectively. respectively. 2024203422

11. 11. The The generator generator system system according according to claim to claim 10, wherein 10, wherein the generator the generator system system is is connected connected totoan anelectric electric motor, motor, the the electric electricmotor motor being being powered bythe powered by thealternating alternating current produced current produced by the by the alternator. alternator.

12. 12. The The generator generator system system according according to claim to claim 11, wherein 11, wherein the generator the generator system system

comprises comprises a aload loadsensor sensorconfigured configuredtotooutput outputinformation informationabout aboutanan operating operating

environment or condition environment or condition of electric of the the electric motor, motor, and wherein and wherein the generator the generator controller is controller is

connected connected totothe the load load sensor sensorand andisisconfigured configuredtotocontrol control aa speed speedofof the the electric electric motor motor

by controllingthe by controlling thethrottle throttlecontroller controllerand and thethe voltage voltage regulator regulator in response in response to the to the

information information output output by by the the load load sensor. sensor.

13. 13. The The generator generator system system according according to claim to claim 12, wherein 12, wherein the generator the generator controller: controller:

stores atleast stores at leastone one set set point point relating relating to an to an operating operating environment environment or condition or condition of of the electric the electric motor; motor;and and in in response to the response to the information information output output by by the the load load sensor, sensor, controls controls the the speed of speed of

the electric the electric motor motorsuch such that that the the set set point point is maintained. is maintained.

14. 14. The The generator generator system system according according to claim to claim 13, wherein 13, wherein the electric the electric motormotor

operatively drives operatively drives aa submersible pumpand submersible pump and the the setpoint set pointrelates relatesto to an an operating operating environment environment ororcondition conditionof of the the submersible submersiblepump. pump.

15. 15. The The generator generator system system according according to claim to claim 14, wherein 14, wherein thepoint the set set point is oneis of onea of seta set of of values corresponding values corresponding to a to a desired desired fluid fluid pressure, pressure, a desired a desired fluid fluid flow flow rate and rate a and a desired fluidlevel. desired fluid level.

25 10 Nov 2024 2024203422 10 Nov 2024

16. 16. The The generator generator system system according according to anytoone anyofone of claims claims 12 to 12 15,to 15, wherein wherein the the generator controller generator controller comprises comprises a first a first controller controller connected connected to a controller, to a second second controller, whereinthethe wherein firstcontroller first controllerisisconnected connected to load to the the load sensor sensor and is and is configured configured to to generate generate and sendcontrol and send control signals signals to to the the second controller based second controller onthe based on theinformation informationoutput outputby bythe the load sensor,andand load sensor, wherein wherein the second the second controller controller is connected is connected to thecontroller to the throttle throttle controller and and to the to voltageregulator the voltage regulatorandand is configured is configured to control to control the of the speed speed of the electric the electric motor by motor by controlling thethrottle controlling the throttlecontroller controllerand andthethe voltage voltage regulator regulator in response in response to the control to the control 2024203422

signals. signals.

17. 17. The The generator generator system system according according to claim to claim 16, wherein 16, wherein the control the control signals signals sent sent to to the second the controller comprise second controller comprise aatarget target speed speedofofthe the electric electric motor, motor, and and wherein the wherein the

second controller second controller causes causes the electric the electric motormotor to operate to operate at thespeed. at the target target speed.

18. 18. The The generator generator system system according according to anytoone anyofone of claims claims 10 to 10 17,to 17, wherein wherein the the generator controller generator controller is is integral integral with with thethe system system controller. controller.

1/3 1/3

10 10 2024203422

44 44 42 42

24 24

32 32

OUT 40 40 36 36 18 18 12 12

IN

38 38 30 30 34 34 20 20 43 43 16 16 14 14

22 22 50 50

FIG. FIG. 11

2/3 2/3 2024203422

60 60

Controller Controller

24 24

Throttle Throttle Voltage Voltage Controller Controller Regulator Regulator

64 64 66 66

Engine Engine Alternator Alternator

12 12 62 62 2 Tank 22 Tank Tank 11 Tank 16 16 14 14

FIG. FIG. 2

3/3 3/3

Remote Remote Control Control

96 70 70 96 2024203422

I/O I/O First First Controller Controller

94 94 80 80

Second Controller Second Controller

82 82 Sensor Sensor Key 92 Key 92 78 78

ECU ECU AVR AVR Pump Pump 76 76 74 74 90 90

Engine Engine Alternator Alternator Motor Motor

12 12 72 72 73 73

Tank 22 Tank

16 16 Tank11 Tank

14 14

FIG. FIG. 3