JPH0798560B2 - Oil supply device with oil type sensor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply device with an oil type sensor for supplying fuel oil such as gasoline or light oil into an oil supply tank of an automobile.

2. Description of the Related Art Conventionally, in order to determine whether the fuel oil to be refueled in a refueling tank provided in an automobile or the like is gasoline or light oil, refueling is performed through an inflow hole formed in a nozzle member. There is used an oil type discriminating device of an oil supply device configured to guide gas in a tank to an oil type sensor and discriminate an oil type by discriminating an output from the oil type sensor at a predetermined discrimination level. In such an oil type determination device, when performing the oil type determination, the gasoline gas or the light oil gas previously detected may remain in the flow path between the inflow hole of the nozzle member and the oil type sensor. Therefore, cleaning is performed by supplying air into the flow path between the oil type sensor and the inflow hole, and then the gas in the refueling tank is sucked through the inflow hole and guided to the oil type sensor. , If the output of the oil type sensor rises to an output level corresponding to the gas and is above the predetermined discrimination level, it is determined that the fuel oil in the refueling tank is gasoline, and if it is less than the predetermined discrimination level, light oil is used. It is determined that

In such a prior art, it is an absolute condition that air is supplied to the oil type sensor regardless of cleaning or suction, and when a configuration related to the air supply fails, the gasoline gas is detected by the sensor. May not be reached, and in such a case the output of the oil type sensor becomes less than the predetermined discrimination level, so it is erroneously determined that the fuel oil in the refueling tank is light oil, even though it is gasoline. There is a risk that In order to prevent such an erroneous determination of the type of oil, it may be possible to separately provide a sensor for determining the presence or absence of air supply, but if such a sensor is provided separately, the configuration becomes complicated. In addition, the manufacturing cost will be high.

Another prior art is disclosed in, for example, Japanese Patent Laid-Open No. 2-191199. In this prior art, when power supply to the heater that heats the detection element of the gas sensor is started, the output signal of the gas sensor changes as if gas is present to prevent refueling from being permitted. A change occurs as if gas is present by monitoring the output signal of the gas sensor until a certain monitoring time elapses when power supply to the heater is started to detect a failure of the gas sensor. It is configured to monitor whether or not.

In such a prior art, since the quality of the gas sensor is determined by the output change of the gas sensor that occurs when the power is turned on, it is necessary to turn on the power from a state in which the gas sensor is completely cooled. To make a determination, it is not possible to perform frequent power on / off operations during business hours because it is time-consuming, and it is not possible to determine the quality of air supply. However, the air supply means and the gas sensor may fail during refueling, and therefore highly reliable oil type detection is desired.

Therefore, an object of the present invention is to solve the above-mentioned technical problems, and based on the output from the oil type sensor without complicating the configuration and without increasing the manufacturing cost. An object of the present invention is to provide an oil supply device with an oil type sensor, which has improved reliability and can detect that air is reliably supplied for each oil supply.

Means for Solving the Problems The present invention includes an oil feed passage in which an oil feed pump, a flow meter, a pipe line and a nozzle member are sequentially connected, a unit for displaying a measured value of the flow meter, and a detection element to be preheated. An oil type sensor for outputting a detection signal corresponding to the temperature change of the detection element, a unit for generating pressurized air, a unit for generating a negative pressure, and an inflow hole opened near the tip of the nozzle member. Have,
A first conduit means for supplying the pressurized air to the oil type sensor; and a second conduit for sucking gas from the inflow hole by guiding the negative pressure to the inflow hole and supplying the gas to the oil type sensor. And a means for switching between a mode for supplying only the pressurized air to the oil type sensor and a mode for supplying the sucked gas to the oil type sensor, and the oil type based on the change in the detection signal of the oil type sensor. Judge,
When there is no predetermined difference in the signal level by comparing the oil type determination means that determines whether or not refueling is possible and the detection signals before and after the start of air supply to the oil type sensor that is performed at the start of each refueling operation. An oil supply sensor-equipped refueling device comprising: an air supply determination means for outputting an air supply failure signal; and means for notifying the air supply failure by inputting the air supply failure signal.

Operation According to the present invention, the oil pumped up by the oil feed pump is fed through the oil feed pump constituted by the oil feed pump, the flow meter, the pipe line and the nozzle member which are connected to each other, for example, the oil supply of the automobile. Supplied to the tank. The measurement value measured by the flow meter provided in such an oil feed passage is displayed by the display means. The atmosphere introduced by the means for guiding the atmosphere near the tip of the nozzle member to the detection element changes the temperature of the detection element, and the oil type sensor outputs a detection signal corresponding to the temperature change. The temperature of the detection element also changes when air is sent from the air supply means, and a detection signal corresponding to the temperature change is output. The air supply determination means inputs a detection signal from the oil type sensor before and after the start of air supply to the oil type sensor performed at each start of the refueling work, and the detection signal has a predetermined difference within a predetermined time. When the air supply failure signal is not generated, the air supply failure signal is output, and the notification unit that has received the air supply failure signal notifies that the air supply failure is due to an alarm sound or a display. When the air supply failure signal is not output, the oil type determination means determines the oil type based on the change in the detection signal, and determines whether or not refueling is possible. After determining whether or not the air has been supplied by the air supply determining means in this way, the availability of refueling is determined by the oil type determining means, so that it is possible to make a reliable oil type determination. To be prevented.

Embodiment FIG. 1 is an overall system diagram showing an embodiment of the present invention. Fuel oil such as gasoline or light oil is stored in a storage tank 1 which is buried in the ground, and is pumped up from a pipeline 2 through a check valve 3 by a pump 4 such as a gear pump to obtain a gas-liquid separator 5 The vaporized gas of gasoline or light oil is discharged to the atmosphere, and the liquid is guided from the pipe 6 to the flowmeter 7 to measure its flow rate, and the liquid is measured from the flexible pipe 8 to the discharge pipe 11a of the nozzle member 10. Through the nozzle hole 12 to the oil supply port 14 of the oil supply pipe 13 of an automobile or the like.

A valve 80 is built in the main body 11b of the nozzle member 10. The valve 80 can be opened by operating the manual lever 81, and oil can be supplied as described above.
The valve 80 is also configured such that when the fuel tank 9 of the automobile is full, a diaphragm (not shown) incorporated in the main body 11b is displaced to close the valve.

The pump 4 is rotationally driven by a motor 15. The oil supply amount measured by the flow meter 7 is detected by the flow rate pulse oscillator 16, and the control circuit 17 causes the display device 18 to digitally display the oil supply amount.

The nozzle member 10 is detachably mounted on the nozzle hooking member 19 as indicated by reference numeral 10a in FIG. The state in which the nozzle member 10 is hooked on the nozzle hooking member 19 is detected by the nozzle detection switch 20. Further, when the nozzle member 10 is removed from the nozzle hooking member 19, that is, when refueling work is started, the nozzle detection signal disappears from the output of the nozzle detection switch 20 and the control circuit
It is input to 17 and it is detected that refueling work has started.

In determining whether the fuel oil stored in the refueling tank 9 is gasoline or light oil, in order to guide the gas in the refueling tank 9 to the oil type sensor 30, a discharge pipe 11a of the nozzle member 10 is connected. Is provided with a gas inflow hole 21. The inflow hole 21 communicates with the sensor unit 23 via the inflow conduit 22.

FIG. 2 is a diagram showing a specific configuration of the sensor unit 23 shown in FIG. Pressurized air from the air pressure source 25 realized by a centrifugal fan or the like is supplied to the two-way valve V1 of the sensor unit 23 via the pipe line 26, and the two-way valve V1 is in the open state and the port A of the three-way valve V2. , B are connected to each other through the two-way valve V1 to be pumped to the pipe 27, further supplied to the inflow pipe 22 through the three-way valve V2 and emitted from the inflow hole 21. A pipe line 28 is branched and connected to the pipe line 27, and the pressurized air passing through the pipe line 28 is guided to the oil type sensor 30 through the injector 29 and is emitted to the atmosphere from the pipe line 31. . A pipe 32 is connected to the port C of the three-way valve V2,
When the ports B and C of the three-way valve V2 are in communication with each other, the negative pressure generated by the pressurized air via the two-way valve V1 and the pipe 28 is guided to the inflow pipe 22. As a result, the gas is sucked from the inflow hole 21 of the nozzle member 10 and diluted by the injector 29, and then is diffused into the atmosphere through the oil passage 30 through the oil type sensor 30.

The gas thus guided to the oil type sensor 30 is contact-combusted by the preheated detection element 33 provided in the housing 34, the reaction heat is detected, and the output corresponding to the reaction heat is the oil type. Derived from the sensor. As such an oil type sensor 30, for example, a contact combustion type, a semiconductor type, or a linear thermal conduction type oil type sensor is used.

FIG. 3 is a block diagram showing an electrical configuration of the control means 17. The control means 17 is basically a counting circuit to which the pulse signal from the flow rate pulse oscillator 16 is input and the nozzle detection signal from the nozzle detection switch 20 is input.
35, a two-way valve drive circuit 36 for deriving a drive signal to the two-way valve V1, and a three-way valve for deriving a drive signal for connecting or disconnecting the ports A and B or the ports B and C to the three-way valve V2. A valve drive circuit 37 and a motor drive circuit 38 for deriving a motor drive signal for driving or stopping the motor 15.
And an oil type determination circuit 39 that determines the oil type by receiving the detection output from the oil type sensor 30, and an air supply in response to the detection signal from the nozzle detection switch 20 and the output from the oil type sensor 30. Air supply determination circuit 40 for determining whether or not the state
And an alarm device track circuit 42 that derives a drive signal for causing the alarm device 41 to perform an alarm operation when an air supply failure signal from the air supply determination circuit 40 is input.

The oil type determination circuit 39 is also responsive to outputs from the nozzle detection switch 20 and the oil type sensor 30 to output an alarm drive circuit 42.
In addition to deriving a refueling inability signal, a signal for deriving a message indicating that cleaning is in progress on the in-cleaning indicator 43 when cleaning is in progress is derived.

An air supply unit is configured by including the above-described respective pipelines 26, 27, 28, the two-way valve V1, the injector 29, and the two-way valve drive circuit 36.
Further, the pipelines 22, 32, the three-way valve V2 and the three-way valve drive circuit 37
The negative pressure inducing means is configured to include. To the air supply means, at least beyond the period from the start of refueling to the end of refueling, that is, before the time when the nozzle member 10 is removed from the nozzle hooking member 19 (time t1 in FIG. 5 described later). ,
The pressurized air is generated after the time when the nozzle member 10 is stopped by the nozzle hooking member 19 (time t5 in FIG. 5, which will be described later). Therefore, pressurized air is continuously supplied from the air pressure source 25 to the air supply means including before and after refueling, and a negative pressure is generated in the injector 29 by this pressurized air. Such a negative pressure can be obtained by connecting the three-way valve V2 to the ports B and C of the three ports A, B and C to which the conduits 22 and 32 are connected, so that the suction hole near the tip of the nozzle member 10 can be obtained. It is guided to 21, and the ambient gas around it is sucked and guided to the oil type sensor 30.

FIG. 4 is a flow chart for explaining the refueling operation by the gasoline refueling device, and FIG. 5 is a graph showing the output of the oil type sensor 30 corresponding to the refueling operation. First, when the nozzle member 10 is separated from the nozzle hooking member 19 in step s1 and then step s2, the counting circuit 35 is reset by the disappearance of the nozzle detection signal. The output from such a nozzle detection switch 20 indicates that the refueling operation has been started, and in step s3, the oil type determination circuit 39 to which the output from the nozzle detection switch 20 is input is the two-way valve drive circuit 36 and A valve opening permission signal is derived to the three-way valve drive circuit 37. Two-way valve drive circuit to which the valve opening permission signal from the oil type determination circuit 30 is input
36 is a state in which the drive signal is derived to the two-way valve V1 to open the valve, and the three-way valve drive circuit 37 derives a drive signal to the three-way valve V2 to set the three-way valve V2 in a state in which ports A and B are in communication. It

In this way, the two-way valve V1 is opened in response to the output from the nozzle detection switch 20, and the ports A and B of the three-way valve V2 are opened.
2, the pressurized air from the pre-driven air pressure source 25 through the conduit 26 passes through the two-way valve V1 and the port of the three-way valve V2, as described in connection with FIG. A,
After passing through B, it is diffused outward from the inflow hole 21 through the pipe line 22. Further, the pressurized air via the pipe 28 branched and connected to the pipe 27 is supplied to the oil type sensor 30 via the injector 29.
To be released to the atmosphere from the pipe 31.

At time t1 when the cleaning is performed in this manner and the pressurized air is supplied to the oil type sensor 30, the output 1 of the oil type sensor 30 rapidly decreases to a level v1 lower than the reference level v0. The output of such an oil type sensor 30 is obtained in step s4.
When there is no change within the time T1 up to the time t2 set in advance in step S5, the air supply determination circuit 40 outputs an air supply failure signal to the alarm device drive circuit 42. The alarm device drive circuit 42 responds to an air supply failure signal from the air supply determination circuit 40 by issuing an alarm device.
A drive signal is derived to 41, and the alarm device 41 thereby starts an alarm operation.

Further, in step s4, when the output from the oil type sensor 30 decreases from the reference level v0 to v1, the process proceeds to step s6, the valve opening permission signal from the oil type determination circuit 39 disappears, and the three-way valve drive circuit 37 outputs. Since the derivation of the drive signal is stopped, the three-way valve
V2 is switched from the state in which ports A and B are in communication to the state in which ports A and C are in communication. That is, in step s6, the pipeline 32 in which the negative pressure is generated and the pipeline 22 connected to the inflow hole 21 communicate with each other, so that the gas in the refueling tank 9 is sucked from the inflow hole 21.

The gas introduced to the injector 29 through the inflow hole 21, the pipe 22, the three-way valve V2, and the pipe 32 in this way is diluted by the pressurized air supplied through the pipe 28, and is diluted. The generated gas is guided to the oil type sensor 30. In this way, when gas is supplied to the detection element 33 of the oil type sensor 30, the detection element 33
Output l increases from step S7, and the output from the oil type sensor 30 in the oil type determination circuit 39 changes to the discrimination level.
If v2 or more, the process proceeds to step s8, the two-way valve V1 is kept open, and the ports A and B of the three-way valve V2 are set in the communicating state, and air is supplied only during the time t3 to t4 for cleaning. Further, the motor drive circuit 38 derives the motor drive signal in response to the output of the oil supply permission signal from the oil type determination circuit 39, the motor 15 is driven, and the gasoline stored in the storage tank 1 is pumped up by the pump 4. The flow rate of the thus pumped gasoline is measured by the flow meter 7, the pulse signal from the flow rate pulse oscillator 16 corresponding to the measured value is counted by the counting circuit 35, and the amount of refueling is digitally displayed on the display unit 18. It

In step s7, when the output from the oil type sensor 30 is less than the discrimination level v2, the process proceeds to step s9, and the indicator 43 indicates that the oil type is different depending on the signal from the oil type determination circuit 39, for example. The alarm display is made by blinking and the like, and an alarming signal is given to the alarm device drive circuit 42 to generate an alarm sound, and the alarm display is performed until the nozzle member 10 is returned to the nozzle hooking member 19 in step s10.

In step s8, when the cleaning is performed until time t4, the two-way valve V1 is closed due to the disappearance of the valve opening permission signal from the oil type determination circuit 39, so the supply of the pressurized air from the air pressure source 25 is stopped. Then, the display of the cleaning on the display 43 is stopped.

Then, in step s11, the nozzle member 1 is attached to the nozzle hooking member 19.
When 0 is returned and the return of the nozzle member 10 is detected by the derivation of the nozzle detection signal from the nozzle detection switch 20, the process proceeds to step s12, and the two-way valve V1 is operated with the ports A and B of the three-way valve V2 communicating. When the valve is open, cleaning is performed for the time T2 from time t5 to time t6, and the indicator
43 indicates that cleaning is in progress.

In the next step s13, it is determined whether or not the output from the oil type sensor 30 is lower than the reference level v0, and if the output is lower than the reference level v0, the process proceeds to step s14 and time t
It is determined whether or not the time T2 has elapsed from 5, and if the time T2 has elapsed, the two-way valve V1 is closed to end the cleaning in step s15, and further cleaning is performed from the time t5 to a predetermined time T3. The display is done. In this way, the in-cleaning indication is displayed until the time t7 even after the end of the cleaning at the time t6 so that the next refueling work is not started before the output 1 completely returns from the v1 level to the v0 level. This is because And step
If the time T3 has elapsed in s16, the display unit will be displayed in step s17.
The in-cleaning display by 43 is erased, and step s18
Ends all refueling operations.

In step s16, when the time T3 has not yet elapsed, it is determined in step s19 whether or not the nozzle member 10 is separated from the nozzle hooking member 19, and if it is separated, the oil type is selected in step s20. The alarm drive circuit 42 derives the alarm drive signal in response to the unrefuelable signal from the determination circuit 39, and the alarm sound by the alarm 41 is performed until the return of the nozzle member 10 is detected in step s21. When 10 is returned to the nozzle hooking member 19, cleaning is started again in step s12.

FIG. 6 is a block diagram showing the electrical construction of another embodiment of the present invention, and FIG. 7 is a diagram showing the concrete construction of the oil type determination means 23a provided in the embodiment shown in FIG. is there. The parts corresponding to those in the above-mentioned embodiment are designated by the same reference numerals. In this embodiment, a reversible pump 45 is used instead of the two-way valve V1 and the three-way valve V2. The reversible pump 45 is rotated normally or inverted by a drive signal from the reversible pump drive circuit 46. The reversible pump drive circuit 46 includes an oil type determination circuit.
The forward rotation signal and the reverse rotation signal from 39 are input. This forward rotation signal is derived at the time of cleaning, which causes the reversible pump 45 to forwardly rotate and pressurize air to the oil type sensor 30.
Also, the cleaning can be performed by discharging from the inflow hole 21 through the pipe line 22. When a reverse rotation signal from the oil type determination circuit 39 is input, the reversible pump 45 reversely rotates to perform the suction operation, whereby the gas in the refueling tank 9 is sucked from the inflow hole 21 of the nozzle member 10 and the oil type. It is guided to the sensor 30. By using such a reversible pump 45, the two-way valve V1 and the three-way valve V2 and the two-way valve drive circuit 36 and the three-way valve drive circuit 37 for driving them can be omitted as compared with the above-described embodiment. Therefore, the configuration can be simplified.

FIG. 8 is a flow chart for explaining the operation of the embodiment shown in FIGS. 6 and 7. In addition, in the portion corresponding to FIG. 4, the subscript a is attached to the number corresponding to each step.
Attach. When it is detected that the nozzle member 10 has separated from the nozzle hooking member 19 in step s2a following step s1a, the reversible pump 45 is normally rotated in response to the normal rotation signal from the oil type determination circuit 39 in step s3a. . After that, in step s4a, air is supplied for time T1, and step a
In 5a, the reversible pump 45 reversely rotates in response to the reverse rotation signal from the oil type determination circuit 39 and starts the suction operation. Further, in step s8a, the reversible pump 45 enters the normal rotation state to perform the air feeding operation, and the cleaning is performed until time t4. Further, in step s12a, the reversible pump 45 is fed in the normal rotation state from time t5 to time t6 to perform cleaning, and the in-cleaning display is performed from time t5 to t7. Suction operation is performed.

In the embodiment shown in FIGS. 1 to 8 described above, although it is determined that the output of the oil type sensor 30 decreases from the reference level v0 to v1 at time t1, it is determined that air is being supplied. On the contrary, it is possible to catch the change in the rising direction depending on the position where the signal on the circuit is taken out.In this case, at time t1, the output from the oil type sensor 30 rises to a predetermined level with respect to the reference level v0. You may make it discriminate | determine that the air was sent when doing. In addition, regardless of whether cleaning or suction is performed, the same applies in that air is supplied to the oil type sensor, and if the oil type sensor is normal, even if suction is performed simultaneously with the start of refueling work, the sensor The output is still changing. It should be noted that the determination as to whether or not the air supply has been performed is not performed at the start of the air supply, and at the end, for example, after time t6 in FIG.
It may be determined whether or not to increase from v1 to v0 to determine whether or not the next refueling is possible, and when it is determined that the air supply is not sufficiently performed, the next refueling may not be permitted.

Furthermore, as another embodiment of the present invention, not only a so-called stand type oil supply device in which the nozzle member 10 is provided in the nozzle hooking member 19, but the nozzle member 10 is hung from the feeding means provided on the ceiling of the gas filling station or the like. It is also possible to suitably implement the so-called hanging type oil supply device. In such a hanging type oil supply device, in response to the lowering operation of the nozzle member 10, for example, the nozzle member has finished descending to the oil supply position. It may be possible to detect that the refueling work has started.

EFFECTS OF THE INVENTION According to the present invention, when the output from the oil type sensor after the refueling operation is started changes with respect to the output before the refueling operation is started, the output from the oil type sensor is changed at a predetermined discrimination level. Since the output is level discriminated to distinguish the oil type,
It is possible to determine whether or not air is supplied to such an oil type sensor, and even if air is being supplied, if the oil type sensor itself fails, the output of the oil type sensor does not change. Therefore, it is possible to know that a problem occurs in the device with a simple configuration.

Further, for each refueling, at least the detection signal at the start of refueling can detect the air supply failure, and at the same time, the quality of the oil type sensor can be detected. The reliability of oil type detection can be markedly improved as compared with the configuration for detecting the quality.

[Brief description of drawings]

FIG. 1 is a system diagram showing the overall configuration of an embodiment of the present invention,
FIG. 2 is a diagram showing a specific configuration of the oil type determining means 23 shown in FIG. 1, FIG. 3 is a block diagram showing an electrical configuration of the control circuit 17, and FIG. 4 is a diagram for explaining a refueling operation. FIG. 5 is a flow chart, FIG. 5 is a graph showing the output of the oil type sensor 30 corresponding to the refueling operation, FIG. 6 is a block diagram showing the electrical configuration of another embodiment of the present invention, and FIG. 7 is shown in FIG. FIG. 8 is a flow chart for explaining the operation of the embodiment shown in FIG. 6 and FIG. 7, and FIG. 9 ... Refueling tank, 10 ... Nozzle member, 14 ... Refueling port,
19: Nozzle hook member, 20: Nozzle detection switch, 21
…… Inflow hole, 22 …… Inflow conduit, 23,23a …… Oil type determination means, 25 …… Air pressure source, 30 …… Oil type sensor, 41 …… Alarm, 43 …… Cleaning indicator, V1… … Two-way valve, V2 ……
Three-way valve, 45 ... Reversible pump

Claims (1)

[Claims] 1. An oil feed passage in which an oil feed pump, a flow meter, a pipe line and a nozzle member are sequentially connected, a means for displaying a measured value of the flow meter, a detection element to be preheated, and a temperature of the detection element. An oil type sensor that outputs a detection signal corresponding to the change, a unit that generates pressurized air, a unit that generates a negative pressure, and an inflow hole opened near the tip of the nozzle member,
A first conduit means for supplying the pressurized air to the oil type sensor; and a second conduit for sucking gas from the inflow hole by guiding the negative pressure to the inflow hole and supplying the gas to the oil type sensor. And a means for switching between a mode for supplying only the pressurized air to the oil type sensor and a mode for supplying the sucked gas to the oil type sensor, and the oil type based on the change in the detection signal of the oil type sensor. Judge,
When there is no predetermined difference in the signal level by comparing the oil type determination means that determines whether or not refueling is possible and the detection signals before and after the start of air supply to the oil type sensor that is performed at the start of each refueling operation. An oil supply device with an oil type sensor, comprising: an air supply determination means for outputting an air supply failure signal; and means for notifying the air supply failure by inputting the air supply failure signal.