JPH0819866B2 - Method and apparatus for remote control of engine generator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control method for an engine generator and a device therefor capable of remotely controlling the engine generator on the load side by using an output cable connecting the engine generator and a load.

[0002]

2. Description of the Related Art Conventionally, as an engine control device for an engine generator, the one described in JP-A-60-162024 has been already proposed. When the power control switch on the load side such as an electric power tool is turned on, the engine control device of the engine generator supplies a current to the photocoupler from the battery, and when the photocoupler is turned on, a circuit for starting the relay is activated. Then, the starter is operated to start the engine. When the power switch on the load side is turned off when the engine is in the rated rotation state, the current sensor that detects the load current does not detect any current.Therefore, the circuit operation for low-speed operation consisting of the relay operates at high speed. The power solenoid deactivates and the engine runs at low speed. When this low-speed operation exceeds the time set by the timer, a circuit for stopping composed of a relay operates to energize the stopping solenoid, thereby automatically stopping the engine.

[0003]

However, in the remote control device for the engine generator described above, several loads are connected to one engine generator, and depending on the operating state, for example, in a power tool for grinder work, The load power switch is always turned on and off, and the submersible motor and lighting power supply are always used in continuous operation. "Starting" and "stopping" the engine with the switch causes a change in current and voltage, which tends to cause a malfunction of the current sensor for detecting the load current.
Further, in the engine generator, it is necessary to remotely control the circuit for adjusting the no-load voltage when the rated rotation is reached at the time of starting, but it does not have any adjusting means, which is very inconvenient in use.

Therefore, in view of the above circumstances, the present invention can accurately determine the control mode by the high frequency signal for remote operation even if the various conditions such as the resistance value of the output cable are carelessly changed, and An object is to provide a convenient remote control method for an engine generator and a device therefor, which is not only for remote control of start and stop but also for voltage adjustment of output voltage having many stages to be controlled.

[0005]

The present invention has been made to achieve the above object. According to claim 1, in an engine generator, a high frequency signal for remote control is provided to an output cable to which a load is connected. Then, the remote control switch having a noise filter connected to the output cable on the load side is turned on a set number of times, the number of pulses of the high frequency signal for remote operation is discriminated on the engine generator side, and the engine is determined according to the number of pulses. The remote control method of the engine generator is characterized by starting and stopping the generator and adjusting the output voltage. According to claim 2, in the engine generator, a high frequency oscillator for supplying a high frequency signal for remote operation to an output cable connecting the engine generator and the load, and a remote controller provided with a noise filter connected to the output cable on the load side. A switch, a discriminating section for discriminating the number of pulses of the remote-control high-frequency signal supplied to the output cable when the remote control switch is turned on a number of times, and a number of pulses of the remote-control high-frequency signal discriminated by the discriminating section. A remote control device for an engine generator comprising a control unit for starting and stopping the engine generator and adjusting the output voltage.

[0006]

1 is a block diagram of an apparatus for carrying out a remote control method for an engine generator according to the present invention. First, the apparatus will be described. In the figure, 1 is an engine and 2 is an engine 1 driven by the engine. It is an AC generator. A dynamo 3 and a starter 4 are attached to the engine 1, respectively, and the dynamo 3 charges the battery 6 via the regulator 5 and the starter switch 8. Further, the starter 4 is driven by the power supply from the battery 6 via the battery switch 7 and the starter switch 8 to start the engine 1, as is well known. The starter switch 8 can be manually switched between preheating, operation, and stop. However, when the safety relay 4a operates, the starter 4 does not start even by the switching operation,
Further, when the emergency relay 9 operates while the engine 1 is being driven, the stop relay 10 operates to excite the stop solenoid 11 and thereby stop the engine 1. Emergency Relay 9
When the lubricating oil becomes an abnormal hydraulic pressure, the hydraulic switch 12 turns on,
When the cooling water temperature becomes an abnormal value, the water temperature switch 13 is turned on, and when an abnormality occurs in the charging of the battery 6, the pilot lip 14 is turned on and operated. The starter switch 8 includes the battery 6, the emergency relay 9, the stop relay 10, and the pilot lamp 1.
4. In addition, DC power is supplied to each device described later. When an abnormality occurs in charging the battery 6 by the dynamo 3, the charge indicator unit 15
The emergency relay 9 is actuated via the switch and the pilot lamp 14 is turned on. Regardless of the switching position of the starter switch 8,
A remote control unit 16 composed of a CPU (central processing unit) supplies a signal to the circuit at each switching position of the starter switch 8 in a timely manner. That is,
When the remote control unit 16 receives a switching position signal indicating that it is a remote control from the remote control / manual changeover switch 17, the starter switch 8 performs predetermined preheating, start-up, and operation as in the case of manual operation. It has a function as a control unit for supplying a signal to the circuit at each switching position of the switch 8. The remote control unit 16 uses the signal identification circuit 18 to load the load device 1
The operation of the oscillation output circuit 20 is controlled by detecting the presence / absence of a power supply state to 9. Further, the remote control unit 16 receives a pulse generated by the operation of the remote control box 22 through the signal identification circuit 18 based on the high frequency signal for remote operation from the oscillation output circuit 20 provided to the output cable 21, and receives the pulse. It also has a function as a determination unit that determines the number. The AC generator 2 is connected to an automatic voltage adjusting circuit AVR. The automatic voltage adjusting circuit AVR can arbitrarily change the output voltage of the AC generator 2 by the variable resistor VR, and the set value of the variable resistor VR can be read by the remote control unit 16. There is. The automatic voltage adjusting circuit AVR controls the current supplied to the field coil ExFg of the exciter in the alternator 2 by the variable resistor VR or by an instruction from the remote control unit 16, and thereby the main field coil. The current supplied to Fg is controlled so that a desired output voltage value can be obtained. A slow-down current transformer CT ₃ is attached to the output line 29 of the AC generator 2, and the slow-down controller 23 is attached to the slow-down current transformer CT _3.
The slowdown solenoid S is connected via. In the case where the slowdown controller 23 controls the engine 1 to automatically slow down according to the presence / absence of the load current, it goes without saying that the slowdown switch 24 is turned on in advance. At the output line 29 of the AC generator 2, a load current for picking up a high-frequency signal for remote operation and a current transformer CT ₁ for high-frequency signal and an ammeter 3 for supplying a signal to the signal identifying circuit 18 are provided.
The current transformer CT ₂ for ammeter for 6 is attached,
Further, it has a voltmeter 25 for reading the output voltage and a frequency meter 26 for reading the power supply frequency. A high frequency signal for remote control is supplied from the oscillation output circuit 20 to the output line 29 of the AC generator 2. The AC generator 2 can supply 3-phase 200V to the load device 19 such as a motor via the first circuit breaker CB ₁ and the output cable 21.
Since the load device 19 is normally supplied with the generator output through the operation panel 27, the remote control box 22 is connected to the operation panel 2.
It is convenient to connect to the device 7, but it can be connected to any place as long as it can be placed near the load device 19 near the operator. The AC generator 2 has a second
The outlet 28 from which AC100V can be taken out is connected through the circuit breaker CB ₂ . When the AC output is taken out from the outlet 28, the remote control unit 1
A signal to the effect that it is being taken out is input to 6. In addition, the remote control unit 16 also receives information as to whether or not the first circuit breaker CB ₁ is turned on.

As shown in FIG. 2, the remote control box 22 comprises a noise filter composed of a capacitor C and a resistor R, a remote control switch PB and a pilot lamp PL. The values of the capacitor C and the resistor R as the noise filter are set to values that allow a high frequency signal for remote control output from the oscillation output circuit 20 to easily pass through and block noise of other frequencies. Remote control switch PB
The operator presses the engine 1 and the alternator 2 a set number of times for remote control. The pilot lamp PL is turned on when the remote control box 22 is connected to the operation panel 27 by the control cable 37. As shown in FIGS. 3 and 4, the remote control box 22 is formed in a shape that an operator can store in a pocket of clothes or the like and carry it.
In addition, a hook 22a is provided so that it can be suspended at an appropriate place such as a wall surface during use.

As shown in FIG. 2, the signal discriminating circuit 18 connects the load current and high frequency signal current transformer CT ₁ with a first amplifier 31 via a filter 30 for removing noise, and further, the first amplifier 31 is connected. The second amplifier 32 for high level and the third amplifier 33 for low level are connected to the amplifier 31 of FIG. The filter 30 is for removing noise having a frequency other than the high frequency signal for remote control output from the oscillation output circuit 20. The second amplifier 32 and the third amplifier 33 include the remote control unit 16 described above.
Are connected, and the second amplifier 32 and the third amplifier 33 operate as described later to discriminate the high frequency signal for remote control from the generator output. On the other hand, the oscillation output circuit 20 has an oscillator 34 whose oscillation operation is controlled by the remote control unit 16, and the high frequency signal for remote operation output from the oscillator 34 is output through the insulating transformer 35 to the output line of the AC generator 2. It will be donated to 29.

Next, a remote control method for the engine generator will be described. In this case, the remote controller / manual selector switch 17 is switched to the remote controller side in advance.

First, to start the engine 1, the remote control switch PB of the remote control box 22 is pressed twice at intervals of about 1 second. As a result of an experiment, the pressing time (pulse width) of the remote control switch PB is about 0.16 ms to 1 s, and the pressing interval (pulse interval) of the remote control switch PB is 96 ms.
About 1 s was the most convenient. By operating the remote control switch PB, the high frequency signal for remote operation output from the oscillator 34 flows to reach the output line 29, the output cable 21 and the remote control box 22. As a result, the load current and the high frequency signal current transformer CT ₁ are connected to the above. The high-frequency signal for remote control is detected, and the filter 30, the first amplifier 31, and the third amplifier
Remote control unit 16 via amplifier 33
It is designed to be input to. That is, since the level of the high frequency signal for remote control is lower than the output value of the AC generator 2, the third amplifier 3 is used instead of the second amplifier 32.
3 is input to the remote control unit 16. The remote control unit 16 operates as shown in FIG. That is, when the remote control / manual changeover switch 17 is set remotely in step 1, it is determined in step 2 whether the circuit breaker CB ₁ is turned on. This determination is made based on whether or not the remote control high frequency signal is input to the remote control unit 16 via the circuit breaker CB ₁ in FIG. Circuit breaker CB ₁
Is off, a buzzer sounds in step 3 to issue an alarm. If the circuit breaker CB ₁ is turned on, the setting is completed in step 4, and the process proceeds to the next step. When starting in step 5, it is determined in step 6 whether or not there is an engine start signal from the remote controller switch PB as described above, and when it is input, the process proceeds to step 7. In step 7, the buzzer is sounded for 2 seconds 2 seconds before the start of preheating, and a person around the engine is notified to prevent danger. Then, in step 8, preheating is performed. Preheating can be freely set within a range of 0 to 15 seconds depending on conditions such as ambient temperature. After sufficient preheating is performed in step 9, the starter 4 is driven and the engine 1 is started in step 10. In step 11, it is determined whether the engine 1 has been started. When the engine 1 is not started, the routine proceeds to step 12, where it is determined whether or not 5 seconds have passed since the starter 4 was driven. If 5 seconds has not passed, the procedure returns to step 11 and if 5 seconds have passed The entire operation including the residual heat is turned off in step 13, and the start control is stopped in step 14. After that, in order to restart the engine 1, the process starts from step 5. If it is determined in step 11 that the engine 1 has been started, the process proceeds to step 15.
Whether or not the engine 1 is started is determined by whether or not the dynamo 3 outputs. Next, in step 15, the circuit for driving the starter 4 and the circuit for preheating are turned off, and in step 15, the startup of the engine 1 is completed. When the engine 1 is started, the engine runs at low speed. After that, when the load current flows through the use of the load device 19, the slow-down current transformer CT ₃ detects the load current to detect the slow-down controller 23.
Deactivates the slow-down solenoid S to bring the engine 1 into a high-speed rated operation and obtain a predetermined generator output from the AC generator 2. When a certain period of time elapses after the load is used, the slowdown controller 23 energizes the slowdown solenoid S to operate the engine 1 at a low speed.

In the startup control of the engine 1, if the AC power source supplies the load within 5 seconds after the startup of the engine 1, the remote control unit 16 immediately stops the engine 1. There is. That is, when the remote control unit 16 detects the load current from the AC power source within 5 seconds after confirming the start-up of the engine 1 by the power output of the dynamo 3, the remote control unit 16 turns on the stop solenoid 11 via the stop relay 10. When the engine 1 is operated and the engine 1 is stopped so that the load is connected to the AC power supply, the load is suddenly started, which is dangerous, so that this danger is prevented.

Next, a case where the AC generator 2 is remotely operated so as to output a predetermined no-load voltage will be described.
First, as shown in FIG. 6, it is started in step 1, it is determined in step 2 whether the engine 1 is started, and if it is determined that the engine 1 is started, the process proceeds to step 3. In step 3, the resistance value of the variable resistor VR of the automatic voltage adjusting circuit AVR, that is, the set value of the output voltage (no-load voltage) of the AC generator 2 is read and stored. Then, in step 4, it is determined whether or not there is a voltage increase signal. For the voltage increase signal, the remote control switch PB is pressed four times. The pressing time and the interval to be pressed in this case are the same as in the case of the above activation. As a result, the remote control high-frequency signal flows from the oscillator 34 to the output line 29, the output cable 21, and the remote control box 22, and this pulse-shaped remote control high-frequency signal is applied to the load current and high-frequency signal current transformer CT ₁ . It is detected and input to the remote control unit 16 via the filter 30, the first amplifier 31, and the third amplifier 33. If it is determined that there is a voltage increase signal, step 5
Then, the remote control unit 16 issues a command to the automatic voltage adjustment circuit AVR, and the exciter field coil ExF
The current supplied to g is increased, thereby increasing the output voltage value of the alternator 2. In controlling the output voltage value, the maximum value to the minimum value of the control range is divided into a plurality of equal parts, and the output voltage value is increased by one step each time it is determined that there is a voltage increase signal. In this case, the value is increased with reference to the set value of the variable resistance VR read in step 3 above. In step 6, the control of increasing the welding current is completed. Conversely, when reducing the output voltage value,
Press the remote control switch PB three times. This operation condition is also the same as that at the time of starting. In step 7, the remote control unit 16 determines the presence or absence of the voltage decrease signal in the same manner as above, and when the voltage decrease signal is present, the step 8
Proceed to. In step 8, each time it is determined that there is a voltage decrease signal, the control range is decreased by one step among the values obtained by equally dividing the control range as described above, and the voltage decrease is completed in step 9.

By the way, when the load current is supplied from the AC generator 2 to the load device 19 after the engine 1 is started and the voltage of the generator output is adjusted as described above, the load current and the high-frequency signal current transformer CT ₁ are supplied. The load current is detected, passes through the filter 30 and the first amplifier 31, and then the second amplifier 3
Not only 2 but also the signal is input to the remote control unit 16 via the third amplifier 33, so that the remote control unit 16 determines that it is not the high frequency signal for remote operation. When such a determination is made, the remote control unit 16 disables the oscillation operation of the oscillator 34 and prohibits the remote control. When the load current disappears, the oscillating operation of the oscillator 34 starts to increase or decrease the voltage,
Furthermore, a control operation for stopping the engine 1 described later is prepared to be possible.

When an overcurrent flows for some reason during the operation of the alternator and the breaker CB ₁ performs a breaking operation, the zero voltage associated with this breaking operation is applied to the remote control unit 1.
6 detects and sounds a buzzer and issues an alarm. At this time, since the engine 1 is in the operating state, it can be recognized that the circuit breaker CB ₁ has performed the breaking operation. Further, when the engine 1 stops and the buzzer sounds, it can be determined that the engine 1 has stopped due to some reason.

Next, when the engine 1 is stopped, as shown in FIG.
As shown in FIG. 1, first, in step 1, it is determined whether or not there is an engine stop signal in step 2. The engine stop signal is generated by the oscillator 3 when the remote control switch PB of the remote control box 22 is continuously pressed for 3 seconds or more.
The high frequency signal for remote control output from 4 is detected by the load current and high frequency signal current transformer CT ₁ in the same manner as described above, and the remote control is performed via the filter 30, the first amplifier 31, and the third amplifier 33. Input to the unit 16. If it is determined in step 2 that there is an engine stop signal, a buzzer is sounded for about 2 seconds 2 seconds before the engine 1 is stopped in step 3. In step 4, the remote control unit 16 turns off the driving circuit, and in step 5, 30 seconds after that, it is determined whether the engine 1 has stopped. If it is determined that the engine 1 is not stopped, the buzzer is sounded in step 6 to issue an alarm, and then in step 7, the starter switch 8 is at the stop position or whether the remote control / manual switch 17 is on the manual side. To judge. Only when the starter switch 8 is in the stop position or the remote controller / manual selector switch 17 is in the manual side, the process proceeds to step 8 to stop the sounding operation of the buzzer. If it is determined in step 5 that the engine has stopped, the process proceeds to step 9 to complete the engine stop control. Remote control switch PB of the remote control box 22
When trying to stop the engine 1 by operating the, while the power is being supplied from the outlet 28 to the single-phase load,
Even if the engine stop signal is input by detecting that the remote control unit 16 is in use, the engine 1
Do not stop. Further, the starter switch 8 has priority over the remote control unit 16, and if the starter switch 8 is switched to the stop position, the engine 1 is stopped regardless of the remote control operation.

In FIG. 8, after stopping the power supply of the generator output,
High frequency signal P for remote control within 1 second ₁, P₂Is remote
Even if input to the control unit 16, the remote command
The control unit 16 does not accept it, but does not control it remotely
Is not done. Also, between the pulses of the high frequency signal for remote operation
If the gap is narrower than the preset 0.96ms-1s,
In the mote control unit 16 for remote control
It is not accepted as a signal. Furthermore,
Even when using a 100-phase AC power supply,
The troll unit 16 detects this and the remote control high frequency
The wave signal is not accepted.

The remote controller / manual selector switch 17 is used.
In order to manually start and stop the engine 1 by setting the start position to the manual position, the starter switch 8 is set to the preheating position to perform a predetermined preheating and then to the starting position, the engine 1 is started, and then the operating position is set. It is the same as the well-known one that the normal operating state is obtained.

[0018]

As described above, according to the remote control method of the engine generator and the apparatus thereof according to the present invention, the mode to be controlled is identified by the number of pulses of the high frequency signal for remote operation. Therefore, the output cable It is possible to accurately determine the control mode by the high frequency signal for remote operation even by inadvertent fluctuations of various conditions such as resistance value, etc., and output with many stages to be controlled as well as remote control of engine start and stop. It is very convenient because it can be effectively applied to voltage adjustment.

[Brief description of drawings]

FIG. 1 is a block diagram of a remote control device that implements a remote control method for an engine generator according to the present invention.

FIG. 2 is a block diagram showing a path until a high frequency signal for remote control output from an oscillator is input to a remote control unit.

FIG. 3 is a front view of a remote control box.

FIG. 4 is a side view of the remote control box of FIG.

FIG. 5 is a flowchart showing remote control when the engine is started.

FIG. 6 is a flowchart showing remote control when the output voltage is increased or decreased.

FIG. 7 is a flowchart showing remote control when the engine is stopped.

FIG. 8 is a waveform diagram showing an unacceptable state of the remote control high-frequency signal after the power supply to the load is stopped in the remote control unit.

[Explanation of symbols]

 1 Engine 2 Alternator 16 Remote Control Unit 18 Signal Discrimination Circuit 19 Load Device 20 Oscillation Output Circuit 21 Output Cable 22 Remote Control Box R Noise Filter Resistor C Noise Filter Capacitor

Claims (2)

[Claims] 1. In an engine generator, a high frequency signal for remote operation is supplied to an output cable to which a load is connected, and a remote control switch having a noise filter connected to the output cable on the load side is turned on for a set number of times. ,
The remote control of the engine generator, characterized in that the number of pulses of the remote control high-frequency signal is discriminated on the engine generator side, and the start / stop of the engine generator and the voltage adjustment of the output voltage are adjusted according to the number of pulses. Method. 2. An engine generator comprising a high frequency oscillator for supplying a remote control high frequency signal to an output cable connecting the engine generator and a load, and a noise filter connected to the output cable on the load side. Depending on the remote control switch, a determination unit that determines the number of pulses of the high frequency signal for remote operation provided to the output cable when the remote control switch is turned on a number of times, and the number of pulses of the high frequency signal for remote operation determined by the determination unit. And a control unit for starting and stopping the engine generator and adjusting the output voltage.