JPH04102596A - Oil feeder with oil type verification sensor - Google Patents

Abstract

PURPOSE:To detect, based on output from an oil type verification sensor, whether air-blow is carried out certainly or not by a method wherein detecting signals before and after the air-blow are compared and when there is no difference exceeding a fixed value between both the detecting signals, a signal indicating defective air-blow is outputted. CONSTITUTION:An output (l) from an oil type verification sensor 30 drops suddenly to a level v1, lower than the standard level v0, at the time t1 when compressed air is supplied after the cleaning to the oil type verification sensor 30. In the case where the output from the oil type verification sensor 30 does not vary within a duration T1 until a preset time t2, a signal indicating defective air-blow is drawn out of an air-blow judging circuit to an alarm driving circuit. When the output from the oil type verification sensor 30 drops to v1 from the standard level v0, a signal allowing a valve to open sent out from the oil type judging circuit disappears, stopping the drawing of the driving signals out of a three-way valve driving circuit. Thereby the three-way valve V2 is shifted from a position of A communicating with B to a position of A communicating with C.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fuel supply device with an oil type sensor for supplying fuel oil such as gasoline or diesel oil into a fuel tank of an automobile, for example.

2. Description of the Related Art Conventionally, gasoline has been the fuel oil to be filled into the fuel tanks of automobiles and the like.

Alternatively, in order to determine whether it is light oil, the gas in the fuel tank is guided to an oil type sensor through an inlet hole formed in the nozzle member, and the output of this oil type sensor is level-discriminated at a predetermined discrimination level. BACKGROUND OF THE INVENTION An oil type determination device for a refueling system is used, which is configured to determine the type of oil. In such an oil type discrimination device, when performing oil type discrimination, previously detected gasoline gas or diesel oil gas 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 inside the fuel tank is sucked through the inflow hole and guided to the oil type sensor. If the output of the oil type sensor rises to the output level corresponding to the gas and is above the predetermined discrimination level, it is determined that the fuel oil in the fuel tank is gasoline, and if it is below the predetermined discrimination level, it is determined that it is diesel oil. It is determined that

In such prior art, it is an absolute condition that air is being supplied to the oil type sensor regardless of cleaning or suction, and if a failure in the air supply-related configuration occurs, gasoline gas will flow to the sensor. In such cases, the output of the oil type sensor will be less than the predetermined discrimination level, and the fuel oil in the fuel tank may be incorrectly determined to be diesel oil even though it is gasoline. There is a risk that this may occur. In order to prevent such misjudgment of the oil type, it may be possible to provide a separate sensor to determine the presence or absence of air supply, but providing such a separate sensor would only complicate the configuration. However, the manufacturing cost will increase.

Problems to be Solved by the Invention Therefore, an object of the present invention is to solve the above-mentioned technical problems and to provide a method 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 that can detect whether air is being supplied reliably.

Means for Solving the Problems The present invention comprises: an oil feed line 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; and a preheated detection element. an oil type sensor that outputs a detection signal corresponding to a temperature change of the detection element; a means for supplying air to the detection element; a means for guiding the atmosphere near the tip of the nozzle member to the detection element; An oil type determination means that determines the oil type based on the change and determines whether or not to supply oil, and a detection signal before and after air supply is compared, and the system starts supplying when the difference between the two does not exceed a certain value. The present invention is a refueling device with an oil type sensor, comprising: an air supply determining means for outputting an air supply failure signal; and a means for notifying an air supply failure by inputting the air supply failure signal.

According to the present invention, the oil pumped up by the oil pump is transferred to, for example, an automobile refueling system through an oil passage constituted by an oil pump, a flow meter, a pipe line, and a nozzle member that are connected to each other. supplied to the tank. The measured value measured by the flowmeter provided in such an oil feed path is displayed by a display means. The atmosphere guided 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 supplied from the air supply means, and a detection signal corresponding to the temperature change is output. The air supply determination means compares the detection signals before and after the air supply, and when a difference exceeding a certain value does not occur between the two, outputs an air supply failure signal, and the notification means receives the air supply failure signal. The system notifies you of poor air supply through an alarm sound or display. When the air supply failure signal is not outputted, the oil type determining means determines the oil type l'JI based on the change in the detection signal, and determines whether refueling is possible.

In this way, after the air supply determining means determines whether or not air has been supplied, the oil type determining means determines whether or not refueling is possible.This makes it possible to accurately determine the oil type and prevent erroneous determination. Prevented.

Embodiment FIG. 1 is an overall system diagram showing an embodiment of the present invention. Fuel oil such as gasoline or diesel oil is stored in a storage tank 1 buried underground, and is connected to a check valve 3 from a pipe 2.
After that, it is pumped up by pump 4, which is a gear pump.
The vaporized gas of gasoline or light oil is led to the gas-liquid separator 5 and released into the atmosphere, and the liquid is led to the flow meter 7 from the pipe line 6 to measure its flow rate, and the liquid is passed from the flexible pipe line 8 to the nozzle member. The oil is supplied from the nozzle hole 12 to the fuel filler port 14 of the fuel filler pipe 13 of an automobile or the like through the discharge pipe 1 ] and a of No. 10.

A valve 80 is built into the main body 11b of the nozzle member 10. This valve 80 can be opened by operating a manual lever 81, and oil can be supplied as described above. The valve 80 is also configured so that when the fuel tank 9 of the automobile becomes full, a diaphragm (not shown) built in the main body 1.1b is displaced and closed.

The pump 4 is rotationally driven by a motor 15.

The amount of oil to be supplied, which is measured by the flow meter 7, is detected by the flow rate pulse oscillator 16, and the amount of oil to be supplied is digitally displayed on the display 18 by the function of the control port n17.

As shown by reference numeral 10a in FIG. 1, the nozzle member 10 is provided with a nozzle hook that is removably hung on a member 19. The state in which the nozzle member 10 is hung on the nozzle hook member 19 is detected by the nozzle detection switch 20. Further, when the nozzle member 10 is removed from the member 19, that is, when refueling work is started, the output of the nozzle detection switch 20 is inputted to the control circuit 17 when the nozzle detection signal disappears, and the refueling work is started. is detected to have started.

In order to guide the gas in the fuel tank 9 to the oil type sensor 30 in order to determine whether the fuel oil stored in the fuel tank 9 is gasoline or light oil, a discharge pipe 11a of the nozzle member IO is connected to the gas in the fuel tank 9. A gas inflow hole 21 is provided. This inflow hole 21 communicates with oil type determination means 23 via an inflow pipe line 22.

FIG. 2 is a diagram showing a specific configuration of the oil type determining means 23 shown in FIG. 1. Pressurized air from an air pressure source 25 realized by a centrifugal fan or the like is supplied to the two-way valve V1 of the oil type determining means 23 through a pipe line 26, and when the three-way valve V1 is open, the three-way valve When the boats A and B are connected, the water is fed under pressure to the conduit 27 through the three-way valve V1, further supplied to the inflow conduit 22 through the three-way valve V2, and then released from the inlet hole 21. A branched pipe 28 is connected to the pipe 27, and the pressurized air passing through this pipe H@28 is guided to the oil type sensor 30 through an injector 29, and then released into the atmosphere from a pipe B31. . A pipe line 32 is connected to the boat C of the three-way valve v2, and when the boats 1 to B and C of the three-way valve V2 are in communication, the two-way valve V1 and the pipe B2
The negative pressure created by the pressurized air via 8 is conducted into its inlet line 22. As a result, gas is sucked through the inflow hole 21 of the nozzle member 10, diluted by the two injectors, and then passed through the oil type sensor 30 and released into the atmosphere from the conduit 31.

The gas guided to the oil type sensor 30 in this way is transmitted to a preheated detection element 33 provided in the housing 32.
catalytic combustion occurs, this reaction heat is detected, and an output corresponding to this reaction heat is derived from the oil type sensor. As the oil type sensor 30, for example, a catalytic combustion type oil type sensor, a semiconductor type oil type sensor, or a thermal linear heat conduction type oil type sensor is used.

FIG. 3 is a block diagram showing the electrical configuration of the control means 17. The control means 17 basically includes a counting circuit 35 to which a pulse signal from the flow rate pulse oscillator 16 is input and a nozzle detection signal from the nozzle detection switch 20, and a drive signal to the two-way valve V1. A two-way valve drive circuit 36 that derives the
Or a three-way valve drive circuit 37 that derives a drive signal for connecting or cutting off the boat BC, a motor drive circuit 38 that derives a motor drive signal for driving or stopping the motor 1, and the type of oil. sensor 30
Oil type determination circuit 3 that determines the oil type in response to the detection output from
9, an air supply determination circuit 40 for determining whether or not air is being supplied in response to the detection signal from the nozzle detection switch 20 and the output from the oil type sensor 30; and an alarm drive circuit 42 that derives a drive signal for causing the alarm 41 to perform an alarm operation when an air supply failure signal is input from the alarm.

The oil type determination port 1839 also has a nozzle detection switch 2.
0 and the output from the oil type sensor 30 to derive a refueling impossibility signal to the alarm drive circuit 42, and when cleaning is in progress, to display on the cleaning in progress indicator 43 that cleaning is in progress. Derive the signal.

FIG. 4 is a flowchart 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, in step s1 and then in step s2, when the nozzle member 10 is separated from the nozzle hook member 19, the counting circuit 35 is reset due to the disappearance of the nozzle detection signal. Such an output from the nozzle detection switch 20 indicates that the refueling operation has started, and in step s3, the oil type determination circuit 39 to which the output from the nozzle detection switch 20 is inputted, detects the two-way valve drive circuit 36 and A valve opening permission signal is derived to the three-way valve drive circuit 37. The two-way valve drive circuit 36, into which the valve opening permission signal from the oil type determination circuit 30 is input, derives a drive signal to the three-way valve V1 to open the valve, and the three-way valve drive circuit 37 drives the three-way valve V2. The signal is derived and the three-way valve v2 is connected to boat A.
.

B is placed in communication.

In this way, the two-way valve V1 is opened in response to the output from the nozzle detection switch 20, and when the boats A and B of the three-way valve V2 are in communication, as explained in connection with FIG. , the pressurized air from the pre-driven air pressure source 25 via the line 26 passes through the two-way valve v1, through the boat AB of the three-way valve v2, and then through the pipe 122 to the inlet hole 21.
radiated outward from the Further, pressurized air passing through a pipe line 28 branched and connected to the pipe line 27 is guided to an oil type sensor 30 via an injector 29, and is dissipated into the atmosphere from a pipe line 31.

Cleaning is performed in this way, and the oil type sensor 30
At time t1 when pressurized air is supplied to
decreases rapidly. When the output of the oil type sensor 30 does not change within the time Tl up to the predetermined time t2 in step s4, the process moves to step s5, and the air supply determination circuit 140 outputs an air supply failure signal to the alarm drive circuit 42. do.

The alarm drive circuit 42 derives a drive signal to the alarm 41 in response to the air supply failure signal from the air supply determination circuit 40,
As a result, the alarm device 41 starts an alarm operation.

Further, in step s4, when the output from the oil type sensor 30 decreases from the reference level vO to vl, step s6
, the valve opening permission signal from the oil type determination port n39 disappears and the derivation of the drive signal from the three-way valve drive circuit 37 is stopped, so the three-way valve V2 changes from the state where boats A and B are in communication to boats A and B. C is switched to a communicating state. That is, in the stellar 7s6, the pipe line 32 where negative pressure is generated and the pipe line 22 connected to the inflow hole 21 are communicated with each other, so that the gas in the fuel tank 9 is sucked through the inflow hole 21.

The gas thus led to the two injectors via the inflow hole 21, the pipe 22, the three-way valve V2, and the pipe 32 is diluted by the pressurized air supplied via the pipe 28, and this dilution The gas is guided to the oil type sensor 30.

When the gas is thus supplied to the detection element 33 of the oil type sensor 30, the output l from the detection element 33 increases, and the process moves to step s7, where the oil type determination circuit 39 discriminates the output from the oil type sensor 30. Stella 7 if level ■2 or higher
Moving on to s8, the two-way valve ■1 is in the open state and the boats A and B of the three-way valve v2 are in the communicating state, and from time t3 to t.
Cleaning is performed by supplying air for only 4 minutes. Further, the motor drive circuit 38 derives a motor drive signal based on the output of the refueling 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 gasoline pumped up in this way 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 fuel supplied is digitally displayed on the display 18. Ru.

In step s7, if the output from the oil type sensor 30 is less than the discrimination level v2, the process moves to step s9, and a signal from the oil type determination circuit 39 indicates on the display 43 that the oil type is different, for example. In addition to displaying the display by blinking, etc., the alarm drive circuit 42 also sends a refueling impossibility signal.
is applied to generate an alarm sound, and an alarm display is performed until the nozzle member 9 is returned to the nozzle member 19 in step slo.

In step s8, when cleaning is performed until time t4, the two-way valve v1 is stopped due to the disappearance of the valve opening permission signal from the oil type determination circuit 39, so the supply of pressurized air from the air pressure source 25 is stopped. Then, the display on the display 43 indicating that cleaning is in progress is stopped.

Thereafter, in step sll, when the nozzle member 10 is returned to the member 19 and the return of the nozzle member 10 is detected by deriving the nozzle detection signal from the nozzle detection switch 20, the process moves to step s12, where the boat of the three-way valve v2 is A
, B are in communication, and the two-way valve ■1 is in the open state,
Cleaning is performed for a time T2 from time t5 to time t6, and the display 43 displays that cleaning is in progress.

In the next step s1.3, it is determined whether the output of the oil type sensor 30 is at the reference level vO or not, and if the output is less than the reference level ■0, step s1
4, it is determined whether time T2 has elapsed from time t5, and if time T2 has elapsed, step s15
The two-way valve V1 is closed to complete the cleaning, and the cleaning in progress display is further displayed from time t5 to a predetermined time T3. The reason why the cleaning in progress display is displayed until time t7 even after the end of cleaning at time t6 is to prevent the next refueling operation from starting before the output l completely returns from v level to ■0 level. This is to prevent this. Then, in step s16, time T3
When the period of time has elapsed, the cleaning in progress display on the display 43 is erased in step s17, and the entire refueling operation is completed in step s18.

Further, in step s16, when time T3 has not yet elapsed, it is determined in step s19 whether or not the nozzle member 10 is detached from the nozzle member 19, and if it is in the detached state, step s20 In response to the refueling impossibility signal from the type determination circuit 39, the alarm drive circuit 42 derives an alarm drive signal, and the alarm 41 makes an alarm sound until the return of the nozzle member 10 is detected by the Stella 1s21, and the nozzle The cleaning is started again in step s12 by returning the member 10 from the nozzle hook to one member.

FIG. 6 is a block diagram showing the electrical configuration of another embodiment of the present invention, and FIG. 7 is a diagram showing the specific configuration of the oil type determination means 23 provided in the embodiment shown in FIG. It is.

In addition, the same reference numerals are given to the parts corresponding to those in the previous embodiment. In this embodiment, the three-way valve ■1 and the three-way valve ■2
A reversible pump 45 is used instead. This reversible pump 45 is rotated forward or reversed by a drive signal from a reversible pump drive port n46. A forward rotation signal and a reverse rotation signal from the oil type determination circuit N39 are input to the reversible pump drive circuit 46. This normal rotation signal is derived when cleaning is performed, and the reversible pump 45 rotates normally to supply pressurized air to the inflow hole 2 through the oil type sensor 30 and the pipe line 22.
Cleaning can be performed by releasing it from 1. Furthermore, when the reversal signal from the oil type determination circuit 39 is input, the reversible pump 45 reverses and performs a suction operation, thereby sucking the gas in the oil tank 9 through the inflow hole 21 of the nozzle member 10 and guided by sensor 30. By using such a reversible pump 45, the two-way valve V1, the three-way valve V2, and the two-way valve drive circuit 36 and three-way valve drive circuit 37 for driving them can be omitted compared to the above-described embodiment. It is possible to simplify the configuration.

FIG. 8 is a flowchart for explaining the operation of the embodiment shown in FIGS. 6 and 7.

In addition, in the parts corresponding to FIG. 4, a subscript a is added to the number corresponding to each step. When it is detected that the nozzle member 10 is detached from the nozzle hook member 19 in step s2a following step sla, step At s3a, the reversible pump 45 is rotated in the normal direction in response to the normal rotation signal from the oil type determination circuit 39. Thereafter, in step s4a, air is supplied for a time T1, and in step a5a, the reversible pump 45 is reversed in response to a reverse rotation signal from the oil type determination circuit 39, and the suction operation is started. Also step s8
At time a, the reversible pump 45 is in a normal rotation state and performs air supply operation, and cleaning is performed until time t4. Further, in step 512a, cleaning is performed by supplying air from time t5 to time t6 with the reversible pump 45 in the normal rotation state, and the cleaning in progress display is displayed at time t5.
- t7, and when determining the oil type, the suction operation is performed in reverse.

In the embodiment shown in FIGS. 1 to 8 described above, time t1
, the output of the oil type sensor 30 changes from the reference level vO to v
Although it is not determined that air is being supplied by decreasing to tl, depending on the position on the circuit from which the signal is taken out, it is also possible to detect a change in the rising direction, and in this case, the time tl It may be determined that air has been supplied when the output of the oil type sensor 30 rises to a predetermined level with respect to the reference level vQ. In addition, regardless of whether cleaning or suction is performed, air is supplied to the oil type sensor in the same way; if the oil type sensor is normal, even if suction is performed at the same time as the refueling operation starts, the sensor There is no change in the output. However, the determination as to whether or not air supply has been performed is not made at the start of air supply, but at the end, for example, after time t6 in FIG. 5, the output level l changes from vl to vQ. It is possible to determine whether or not the next refueling is allowed based on whether or not the air rises to .If it is determined that sufficient air is not being supplied, the next refueling may be disallowed.

Furthermore, as another embodiment of the present invention, the nozzle hook is a member 19.
The present invention is suitably implemented not only for a so-called stand-type refueling device in which a nozzle member 10 is provided on a fuel supply station, but also for a so-called hanging-type refueling device in which the nozzle member 10 is suspended from a feeding means provided on the ceiling of a gas station. In such a hanging type refueling device, in response to the lowering movement of the nozzle member 10, for example, the start of refueling work is detected when the nozzle member has finished lowering to the refueling position. You can.

Effects of the Invention According to the present invention, when the output from the oil type sensor after the refueling operation is started changes from the output before the refueling operation, the output from the oil type sensor is determined at a predetermined discrimination level. Since the oil type is determined by level discrimination of the output,
It is now possible to determine whether air is supplied to such an oil type sensor, and even if air is being supplied, if the oil type sensor itself is malfunctioning, the output l will not change, so the device With a simple configuration, it becomes possible to know that an inconvenience has occurred.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing the overall configuration of an embodiment of the present invention;
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 the electrical configuration of the control circuit 17, and FIG. 4 is a diagram for explaining the oil supply operation. Flowchart, Figure 5 shows the oil type sensor 30 corresponding to the oil supply operation.
FIG. 6 is a block diagram showing the electrical configuration of another embodiment of the present invention, Section 7 shows the specific configuration of the oil type determination means 23a of the embodiment shown in Section 6. 8 are flowcharts for explaining the operation of the embodiment shown in FIGS. 6 and 7. 9... Fuel tank, 10... Nozzle member, 14...
Fuel supply port, 19 Nozzle hook member, 20... Nozzle detection switch, 2]... Inflow hole, 22... Inflow pipe, 232
3a... Oil type determination means, 25... Air pressure source, 30...
・Oil type sensor, 41...Alarm, 43 Cleaning indicator, ■1...-2-way valve, ■2-3-way valve, 45...Reversible pump agent Patent attorney Number of strokes Keiichi

Claims (1)

[Scope of Claims] An oil supply line that sequentially connects an oil supply pump, a flowmeter, a pipe line, and a nozzle member, means for displaying a measured value of the flowmeter, and a detection element that is preheated, an oil type sensor that outputs a detection signal corresponding to a temperature change; a means for supplying air to the detection element; a means for guiding the atmosphere near the tip of the nozzle member to the detection element; It compares the detection signals before and after air supply, and outputs an air supply failure signal when the difference between the two does not exceed a certain value. A refueling device with an oil type sensor, comprising: an air supply determining means for determining the air supply; and a means for notifying an air supply failure by inputting the air supply failure signal.