JPH0741957B2 - Oil type discriminator installed alongside refueling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supplying fuel oil such as gasoline or light oil to an automobile which is used in a gas station.

[0002]

2. Description of the Related Art At a gas station, devices for supplying a plurality of oil types such as gasoline and light oil are installed side by side or separately on the same site. However, since the appearance of the refueling equipment is the same, it is possible to accidentally stop at a location with a different oil type.Therefore, there are frequent accidents in which light oil is supplied to a gasoline vehicle or gasoline is supplied to a light oil vehicle. However, the oil in the fuel tank of the car must be drained, which requires a large amount of expense and labor. Therefore, the present applicant has proposed a refueling device that discriminates the type of oil using a gas sensor such as Japanese Patent Application No. 62-205554. In the above proposal, the gas atmosphere in the vicinity of the tip of the nozzle is sucked and guided to the gas sensor to determine whether it is gasoline or light oil from the concentration value of the gas to be measured. There are various gas sensors that can be used in this case, but from the viewpoints of life, maintenance, and price, the gas sensor of the electrical detection method represented by the contact combustion method, semiconductor method, and heat conduction method is most effective.

[0003]

In the case of implementing the above prior art, it is necessary to sufficiently clean the detection element after the detection is completed, but when the liquid or a gas in a state close to that is sucked, the previous suction is performed. Some gas may remain, which may cause malfunctions.

[0004]

[Means for Solving the Problem] A pump that pumps out oil, a motor that drives the pump, a flow meter that measures the pumped oil, a hose, and a device that sequentially connects a nozzle are installed side by side.
A means for generating a negative pressure, a gas air supply path having one end opened near the tip of the nozzle and the other end connected to the negative pressure generation means, and a position where a gas flowing through the gas air supply path is in contact. A gas sensor provided to generate an output signal having a value corresponding to the concentration of the gas to be measured, a means for setting a comparison value, and the presence or absence of the nozzle at the standby position for refueling are detected and responded to. A nozzle detection switch that outputs a signal to start, a means for starting the suction of gas through the gas supply passage triggered by the detection of the absence of the nozzle by this switch, and the gas sucked from the start of gas suction A setting means in which a time shorter than the time required to reach the gas sensor is set as the determination time, and the output value of the gas sensor is the ratio between the start of the gas suction and the determination time. A determining means for generating an error signal when it exceeds the value, and a notification means for notifying the occurrence of an error by receiving the occurrence of an error signal.

[0005]

According to the present invention, the gas in the vicinity of the tip of the nozzle is sucked and sent to the gas sensor, triggered by the detection of the absence of the nozzle at the standby position for refueling. If the time from the start of gas suction to the gas detection by the gas sensor is shorter than the time when the normal gas reaches the gas sensor, it is judged that the gas at the previous detection remained in the gas supply passage and an error occurred. Signal the occurrence of.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, one oil supply amount indicator 2 and one alarm 3 using the indicator and three nozzles 4, 4 and 4 having different oil types are provided on one surface of the oil refueling device 1. Is provided, and the refueling amount display 2 and the alarm 3 are shared by the three nozzles 4, 4 and 4, and the recess 5 for mounting the refueling port cap of the automobile and the nozzles 4 and 4 are provided. Nozzles 6, 6, 6 for storing the oil tanks 4 and 4 in a standby state for oil supply, and hoses 7, 7, 7 for oil supply connected to the nozzles 4, 4, 4.

FIG. 2 shows a system of the apparatus, in which the pump unit 8 is driven by a motor 9 and an oil feeding pipe 10 is driven.
A pump that pumps oil from an oil storage tank (not shown) via a valve, a relief valve that bypasses this pump, a strainer and a check valve that are installed on the upstream side of the pump, and an air separator and a filter that is installed on the downstream side of the pump. Is installed inside. The flow meter 11 measures the amount of oil sent from the pump unit 8 and causes the flow rate pulse transmitter 12 to output the number of flow rate pulse signals a corresponding to the measured amount. The connection fitting 75 connects the hose 7 and the air supply pipe 13 and allows the gas air supply passage 14 described later to be led out from the hose 7 in a liquid-tight state. In addition to the above, the fuel supply device 1 accommodates a sensor unit 15, a nozzle detection switch 16 that outputs a nozzle detection signal b depending on the presence or absence of the nozzle 4 in the nozzle case 6, and an electric circuit 17 described later. The nozzle detection signal b is in the H state when the nozzle 4 is present and is in the L state when the nozzle 4 is not present.

In FIG. 3, the discharge pipe 18 connected to the tip of the nozzle 4 has the following features. The branch fitting 19 has a T-shaped passage 23 having openings 20, 21, and 22.
Is formed inside, and the gas supply passage 14 extended from the sensor unit 15 is connected to the opening 20. In this passage 23, openings 21 and 22 are formed with a small diameter, and a ball valve 24 is movably housed inside, so that the opening in the direction in which the ball valve 24 moves, that is, the opening 21 in the figure is closed. Has become. The branch fitting 19
Are fixed by a set screw 27 so that the openings 21 and 22 are aligned with the suction holes 25 and 26 formed in the discharge pipe 18, respectively. By doing so, when the nozzle 4 is inserted into the oil supply port, the gas is always sucked from the suction hole located above regardless of the insertion direction of the discharge pipe 18, and the oil gas heavier than the air discharged from the inside of the discharge pipe 18 is discharged. The risk of false detection due to suction is eliminated. The air pipe 28 is provided to detect bubbles and rise in oil level and stop refueling, and uses the negative pressure generating means for generating a negative pressure by the flow of oil using a venturi (not shown) and the movement of the diaphragm. Connected to the negative pressure rise detection means, the discharge pipe 1
Open ends 29 and 30 are provided on the tube wall and the tip of 8, respectively.

In the air pipe 28, air is always sucked from the open ends 29 and 30 during refueling, but the rise of the oil level causes the open end 30 to be closed first, and then the open end 29 to be closed. When the valve is closed, the oil supply to the nozzle 4 is stopped by the output signal from the negative pressure increase detecting means, and the oil supply is ended. At this time, the oil is sucked and remains in the air pipe 28, but when the discharge pipe 18 is inserted downward into the oil supply port at the time of the next oil supply, the residual oil in the air pipe 28 is vigorously pushed from the open end 30 side. Since the oil is discharged, it is possible to prevent the oil from flowing into the suction holes 25 and 26. The air inflow pipe 31 is opened toward the downstream in the discharge pipe 18, and the air inflow hole 33 is connected to the outside air via a spherical check valve 32 made of lightweight resin or the like.

If the tip of the discharge pipe 18 is submerged in the oil when the refueling is completed, the discharge pipe 18 is filled with oil, and the nozzle 4 is not fully discharged and the nozzle 4 remains in the nozzle case. When the oil is returned to No. 6, this oil will be discharged first at the start of the next oil supply. Then, there is a possibility that the gas generated from the spilled oil may be sucked. However, if this air inflow pipe 31 is installed, the discharge pipe 18
Even if the tip of the oil is submerged in the oil, the air flows in from the air inlet 33 and discharges all the oil in the discharge pipe 18, so that the problem at the start of the next oil supply is solved. Note that the pressure wave generated when the discharge flow velocity of the nozzle 4 changes in an increasing direction causes oil to momentarily flow into the air inflow pipe 31, but this oil is discharged from the air inflow port 33 by the check valve 32. Is blocked.

FIG. 4 shows the details of the gas sensor units 15 provided in pairs for each nozzle 4, which will be described below. The pressurized air pipe 34 connected to a pressurized air generating means such as a compressor has an air source valve 90 which is a two-way solenoid valve.
The compressed air that has passed through the air source valve 90 is directly connected to each gas sensor unit 15 and a pipe line 35,
It has ports A, B, and C, and when it is not energized, it connects to port B and port C, and when energized, it connects to each gas sensor unit 15 after passing through a cleaning switching valve 36, which is a three-way solenoid valve that connects port A and port C. It is divided into a conduit 37. An electric detection type gas sensor is connected to the pipe line 35, and an air switching spring return type switching valve 39 having ports D, E, F, G, H and I is connected to the pipe line 37. Is for port D and port H and port E and port G when pressurized air is not acting on port I
When the pressurized air acts, the port D and the port G and the port F and the port H are connected. However, this time port G is blocked.

Further, an ejector 40 and a throttle valve 42 for generating a negative pressure are provided in the pipe 41 connected to the port F when the pressurized air is supplied to the pipe 35 and its branch pipe, and the gas supply passage 14 is provided. An orifice 43 for opening this to the atmosphere is provided in the middle of the valve so as to prevent the oil from reaching the gas sensor 38 even when the oil itself is sucked in by adjusting the negative pressure value of the gas supply passage 14. There is. The bypass pipe 45 that bypasses the air source valve 90 has a stop valve 44 and an orifice 46.
However, since the stop valve 44 is normally closed, pressurized air does not flow into the downstream side of the air source valve 90 while the air source valve 90 is closed, that is, when not energized. When the air source valve 90 is opened while the switching valve 36 is not energized, the pressurized air flows into the conduit 35, passes through the ejector 40 and reaches the gas sensor 38, and the cleaning process of the gas sensor 38 and the throttle valve 42 to the port D. Further, a cleaning process of the gas air supply passage which is discharged from the tip of the gas air supply passage 14 to the atmosphere through the port H is performed.

At this time, a part of the pressurized air is discharged to the atmosphere through the orifice 43. When the cleaning switching valve 36 is energized and the ports A and C are connected while the air source valve 90 is open, pressurized air flows into the conduit 37 and is input to the port I of the switching valve 39. Then the switching valve 39
Then, the port F and the port H are connected, and the gas sucked from the suction hole 26 flows from the air supply passage 14 to the port H and further from the port F through the pipe 41, and the ejector 40 pressurizes the compressed air flowing in the pipe 35. The sampling process in which the gas is mixed with the gas is sent to the gas sensor 38. The gas sucked at this time is also mixed with the atmosphere flowing in from the orifice 43. After that, when the cleaning switching valve 36 is de-energized, the ports B and C are connected and the pressurized air input to the port I flows out to the atmosphere, so that the switching valve 39 connects the ports D and H again. Return to the cleaning process. Further, when the shut-off valve 44 is left open, the pressurized air is sent to the gas sensor 38 and the gas supply passage 14 through the bypass pipe 45, but the compressed air is sent to prevent freezing in winter and the temperature in the refueling device in summer. Cooling of the gas sensor 38 against rises helps prevent changes in sensitivity due to temperature changes in the gas sensor.

FIG. 5 shows a circuit configuration of the control unit 17, which is connected via a power switch 47 of a power line 48 provided at a place away from an oil supply device such as an office and a compulsory switch 49 is connected to a sensor 38. Controls the power supply to the heater circuit of. The current change detection circuit 50 determines whether or not the power supply line is energized, that is, whether or not power is being supplied to the heater circuit of the sensor 38, and whether or not current is flowing, and when power supply is started. The power supply start signal c is output. The forced open time setting circuit 51 is a time period Td required for cooling the detection element 67 to such an extent that the detection element 67 cannot function when the power supply to the heating heater 66 of the detection element 67, which will be described later, incorporated in the gas sensor 38 is stopped.
For example, 10 seconds is set, and the set value is output as the forced opening time signal d.

In the comparison value setting circuit 52, the sensor signal e which is the output signal of the gas sensor 38 is set as the value Sf at the time of detecting the gasoline gas, and this value is output as the comparison value signal f. The monitoring time setting circuit 53 sets a time Tj required for the heating power of the heater 66 to be completely supplied to the power line 48 to completely warm the heater 66, for example, 5 seconds, and this set value is set as the monitoring time signal j. It is outputting. The clock signal generation circuit 54 outputs the clock signal h. The first determination time setting circuit 55 starts the suction through the gas supply passage 14, that is, the ports A and C in the cleaning switching valve 36 as described later.
A time Ti, for example, 2 seconds, which is slightly shorter than the time required for the gas to be sucked and reaches the gas sensor 38 from the start of communication with, is set, for example, 2 seconds, and the set value is output as the first determination time signal i.

The second determination time setting circuit 56 is used for the gas supply passage 1
A time Tk, for example, 10 seconds, which is sufficiently longer than the time required for the sucked gas to reach the gas sensor 38 since the start of suction through 4, ie, 3 seconds, is set,
The set value is output as the second determination time signal k.
The determination circuit 57 is responsive to input of various signals to open the switch signal m, error signal n, sensor abnormality signal p, and determination signal r.
Is output selectively. The annunciator drive circuit 58 operates the annunciator 3 based on the input of a signal which will be described later, and leaves it to stand. The start-up cleaning time setting circuit 59 sets a time Ts required for removing the nozzle 4 from the nozzle case 6 and inserting the nozzle 4 into a fuel filler port (not shown) of the vehicle, for example, about 2 seconds. It is output as a cleaning time signal s. End cleaning time setting circuit 6
For 0, a cleaning time Tt, which is further performed after the nozzle 4 is returned to the nozzle case 6, is set to, for example, 3 seconds, and this set value is set to the end cleaning time signal t.
Is output as.

The flow velocity change detection circuit 61 uses the nozzle detection signal b.
When the flow rate pulse signal a is input after the change to the L state and the input cycle of the flow rate pulse signal a becomes long, that is, the built-in valve of the nozzle 4 is closed or the flow passage is closed or narrowed by the oil flow control valve described later. Further, when the number of rotations of the motor 9 is reduced, it is determined that the refueling work is almost completed, and the one pulse of the flow velocity change signal u is output. The cleaning switching valve control circuit 62 clocks the Ts time triggered by the input of the judgment signal r and the change of the nozzle detection signal b to the L state, and when that is completed, the cleaning switching signal w is output and the L of the nozzle detection signal b is output. When the time Ts has elapsed from the state, the determination start signal g is output as one pulse. When the time Ts has elapsed from the input of the other determination signal r, the original valve closing signal x is output as one pulse.

The air source valve control circuit 63 uses the nozzle detection signal b.
From the change to the L state from the input of the air valve closing signal x or the input of the flow velocity change signal u to the nozzle detection signal b
Is changed to the H state, and the valve opening signal y is output to open the air source valve 90 until the end cleaning time Tt elapses. The pump motor control circuit 64 outputs the motor drive signal Z from when the judgment signal r is input until the nozzle detection signal b changes to the H state to output the pump motor 9
To rotate. The counting circuit 65 is reset by the change of the nozzle detection signal b to the L state, calculates the amount of oil supply by counting the number of the input flow rate pulse signals a, and outputs the calculation result as the oil supply amount signal v. Then, the refueling amount display 2 is displayed.

A semiconductor type gas sensor 3 shown in FIG.
8, a heater 66 for heating the detection element 67 of the gas sensor 38, terminals 68 to 71, respectively, and a load resistance R are provided, and the heater voltage Va is supplied by the power supply line 48.
And the circuit voltage Vb are applied, and in the presence of gas, the sensing element 6
The resistance value of 7 changes, which appears as a change in the output voltage Vc, and is output as a change in the sensor signal e. There may be a case where the detection element also serves as a heater as in the case of the catalytic combustion method, but the description will be made as another functional portion for convenience.

Based on the above structure, the description will be continued below based on the operation of the store opening and refueling work on the premise that it is a gasoline refueling device. Power switch 4 when opening
When 7 is turned on, the forced switch 49 is closed at this time, so the current change detection circuit 50 detects that the power supply line 48 has been energized and outputs the power supply start signal c as one pulse. Then, the determination circuit 57 outputs the switch opening signal m to open the contact of the forced switch 49 for the time Td set in the forced opening time setting circuit 51. When the Td time elapses, the output of the switch open signal m is stopped, and power is supplied to the heater 66 of the gas sensor 38. At this time, the power supply start signal c is generated from the current change detection circuit 50, but in this case it is performed at the same time as the output of the switch open signal m is stopped. Will not be output, and power supply to the heater 66 will continue to be allowed. However, when a power failure occurs and then returns, there is no stoppage of output of the switch open signal m, and therefore the operation is the same as when the power switch 47 is first closed.

Then, the judgment circuit 57 determines the value of the sensor signal e and the set value set in the comparison value setting circuit 52 from the time when the output of the switch open signal m is stopped until the time Tj set in the monitoring time setting circuit 53 elapses. Compared with Sf, if the sensor signal e changes as shown in FIG. 6 and the value of the former exceeds the value of the latter, the gas sensor 38 does not operate particularly as normal, but if it does not exceed the value of the gas sensor 38. When it is determined that some abnormality has occurred in the heater 66 or the detection element 67, the sensor abnormality signal p is output and the notification device 3 is notified. On the other hand, at this time, the value of the sensor signal e is the set value S
Even if the value of f is exceeded, it is not due to the presence of gasoline gas, so the determination circuit 57 does not output the determination signal r, that is, it does not permit refueling. In the explanation above,
When the power supply start signal c is generated, the compulsory switch 49 is set to T
The d time, that is, the time until the detection element 67 cools down is that the detection element 67 is not cold when the power supply to the heater 66 is restarted after a short power failure. This is because it does not change as in 6, that is, it does not exceed the set value Sf, so that it is prevented that this phenomenon is judged to be an abnormality occurrence of the gas sensor 38.

Here, in order to confirm the abnormality of the gas sensor 38, the value of the sensor signal e is compared with the comparison value Sf set to determine whether the gas is gasoline gas.
A comparison value may be provided separately for checking the sensor abnormality. After that, when the customer comes to desire gasoline and takes out the gasoline nozzle 4 from the nozzle case 6, the nozzle detection signal b output from the nozzle detection switch 16 changes from the H state to the L state. Is performed. The count value of the counting circuit 65 is reset to zero, and the air valve control circuit 63 outputs the valve opening signal y to open the air valve 90.
Further, the cleaning switching valve control circuit 62 starts counting by counting the clock signal h, and outputs the cleaning switching signal w to turn on the cleaning switching valve 36 after the elapse of Ts time set in the starting cleaning time setting circuit 59. The energizing is switched from the communication state of the ports B and C to the communication state of the ports A and C.

That is, until the time Ts elapses, the pressurized air flows from the air source valve 34 to the pipe 35, the ejector 40 to the gas sensor 38 and the pipe 35, and the throttle valve 42, the port D, the port. A cleaning process in which H and the gas supply passage 14 are sent in this order is performed, and when Ts elapses, the negative pressure generated in the conduit 41 by the pressurized air passing through the ejector 40 causes the gas supply passage 14 to be discharged from the tip thereof. A sampling process is performed in which the gas is sucked and flows in the order of the gas supply passage 14, the port H, the port F, the pipe 41, and the ejector 40 to reach the gas sensor 38. The cleaning switching valve control circuit 62 outputs the determination start signal g when the time Ts has elapsed. When the determination start signal g is input, the determination circuit 57 counts the clock signal h to determine the Ti time set in the first determination time setting circuit 55 and the Tk time set in the second determination time setting circuit 56. When the time is measured and the value of the sensor signal e exceeds the value of the comparison value Sf set in the comparison value setting circuit 52 while measuring the Ti time, it is determined that the gas sensor 38 has not been sufficiently cleaned and an error occurs. The signal n is output, and the notification device 3 is notified, and the determination signal r is not output.

If the Ti time is not exceeded during the time counting and the Tk time is exceeded, it is determined that gasoline gas is present and the determination signal r is output. If the time does not exceed the Tk time, the gasoline signal does not exist and the vehicle may not be a gasoline-powered vehicle. Therefore, the error signal n is output to notify this.
When the presence of gasoline gas is confirmed and the determination signal r is generated, the following operation is performed. The pump motor control circuit 64 outputs the motor drive signal z to output the pump motor 9
Is energized to enable refueling. Then, the cleaning switching valve control circuit 62 stops outputting the cleaning switching signal w to deactivate the cleaning switching valve 36.

As a result, the sampling process is changed to the cleaning process, and the value of the sensor signal e changes as shown in FIG. The cleaning process this time is performed from the input of the determination signal r to the elapse of the Ts time set in the starting cleaning time setting circuit 59, and after the Ts time has elapsed, the cleaning switching valve control circuit 62.
When the air source valve closing signal x is output from the air source valve control circuit 63, the air source valve control circuit 63 stops the output of the valve opening signal y to cut off the supply of the pressurized air to reduce the consumption of the pressurized air. After that, when the lever 72 of the nozzle 4 is operated and the built-in valve (not shown) is opened, oil is discharged from the discharge pipe 18, and this oil amount is displayed on the oil supply amount indicator 2 as described above.

When the refueling work progresses and once the refueling is stopped or the refueling speed is suppressed, the flow velocity change detection circuit 61 detects this and determines that it is almost full, and outputs the flow velocity change signal u. Then, the air source valve control circuit 63 outputs the valve opening signal y again to open the air source valve 90 to perform the cleaning process and prevent oil from entering through the suction holes 25 and 26. When the nozzle 4 is returned to the nozzle case 6 after refueling is completed, the pump motor control circuit 64 stops outputting the motor drive signal z and deactivates the motor 9. on the other hand,
The air source valve control circuit 63 measures the Tt time set in the end cleaning time setting circuit 60 by counting the clock signal h, and when the Tt time elapses, the valve opening signal y
Will be stopped and the air source valve 90 will be closed.

Although the embodiment has been described above, a part of the embodiment can be modified as follows.
Instead of controlling the rotation of the motor 9 as a means for controlling the oil supply, it is also possible to provide an oil passage control valve 73 shown by a two-dot chain line in the oil supply pipe 13 in FIG. 2 and control the opening degree of this valve. is there. In that case, the motor 9 is energized by the change of the nozzle detection signal b to the L state, the oil flow path control valve 73 is opened by the generation of the determination signal r, and the motor 9 is changed by the change of the nozzle detection signal b to the H state. And the oil flow path control valve 73 is closed. The gas sensor 38 may be installed not only on the downstream side of the ejector 40 but also on the conduit 41 as shown by the chain double-dashed line in FIG. 4 or on the gas air supply path 14. However, since the gas concentration differs depending on the installation location, it is necessary to adjust the sensitivity of the gas sensor 38 or select a sensor suitable for the concentration. Although the present embodiment has been described with respect to the device for supplying gasoline, the device for supplying light oil or kerosene may be used. In that case, the refueling is permitted on condition that the gasoline gas is not detected even if a certain time has passed since the nozzle 4 was inserted into the refueling port, that is, a time sufficient for the gas to reach the gas sensor 38. Alternatively, refueling may be permitted only when it is confirmed that a thin gas such as light oil or kerosene gas is thinner than gasoline gas.

In this embodiment, the comparison value Sf is set to determine whether or not it is gasoline gas, and this value is compared with the value of the sensor signal e. Change rate For example, the change rate of gasoline gas is large and the change rate of light oil or kerosene gas is small, so calculate this
It is also possible to make a determination from this calculated value or to make a determination based on a change value from the value of the sensor signal e at the end of the cleaning process at the start of the refueling operation. If this method is adopted, it is also useful for compensating for the change in the electric resistance value of the gas sensor 38 which changes depending on the outside temperature and humidity. As the negative pressure generating means, a vacuum pump or the like can be adopted regardless of the ejector. A voltage change detection circuit is provided in place of the current change detection circuit 50 to detect whether or not a voltage is applied to the power supply line 49 that connects the compulsory switch 49 and the gas sensor 38 and to start the application to supply the power supply signal c. Can also be output. Even when the detection element also serves as a heater, it is included in the present application.

On the other hand, the malfunction prevention rate can be further improved by making the following measures. At the same time as turning on the power switch 47, the cleaning process is performed for a certain period of time, and the condensation of water at night is made to evaporate or blow off the water droplets adhering to the gas sensor 38 and the case that covers it to facilitate the passage of gas. As shown in FIG. 5, a heater for heating the case of the sensor covering the gas sensor 38 is added to prevent defective passage of gas due to freezing in winter. When the shape of the nozzle case 6 is changed so that the discharge pipe 18 of the nozzle 4 is housed downward when oil is not supplied, the oil remaining in the discharge pipe 18 is discharged, so the oil that has flowed out of the discharge pipe 18 at the time of the next detection. It is possible to detect the gas of and prevent the risk of malfunction. In the case where the discharge pipe 18 of the nozzle 4 is stored in the nozzle case 6 facing upward as in the present embodiment without adopting this method, when the discharge pipe 18 of the nozzle 4 is accommodated, the nozzle case 6 is engaged and the inside of the discharge pipe 18 is opened. A valve for discharging oil is provided in the nozzle 6.

While the nozzle 4 is housed in the nozzle case 6, air is blown toward the discharge pipe 18 to discharge it.
Evaporate the oil adhering to. In the above method, a means for restricting the removal of the nozzle 4 from the nozzle case 6 is also provided for a sufficient time for removing the oil inside and outside the discharge pipe.
An opening 80 at the tip of the discharge pipe 18 is normally closed to limit the outflow of oil and to provide a valve lid that is opened by the oil discharge pressure.

[0031]

As described above, when the gas suction work is started, when the gas arrival is detected in a time shorter than the time normally required for the gas to reach the gas sensor, Since sufficient cleaning was not performed after gas detection, the gas previously sucked remains and it is judged that accurate oil type detection is not possible, and the operator notices this as a detection error notification process. Then, the oil type is detected again, and it is possible to reliably prevent the wrong oil type refueling due to the wrong oil type detection.

[Brief description of drawings]

FIG. 1 is a diagram showing an appearance of a fuel supply device.

FIG. 2 is a diagram showing a related state of an oil supply device and an oil type determination device.

FIG. 3 is a diagram showing a structure of a discharge pipe of a nozzle.

FIG. 4 is a diagram showing a structure inside a gas sensor unit.

FIG. 5 is a block diagram showing an electric circuit in a control unit.

FIG. 6 is a diagram showing a change in sensor output when a power switch is turned on.

FIG. 7 is a diagram showing a change in sensor output when the gas sampling process is switched to the cleaning process.

FIG. 8 is a diagram showing a system flow during refueling work.

FIG. 9 is a diagram showing a system flow when the power switch is turned on.

FIG. 10 is a diagram showing a basic circuit of a gas sensor.

[Explanation of symbols]

 1 Refueling device 4 Nozzle 6 Nozzle case 7 Hose 8 Pump unit 11 Flowmeter 14 Gas air supply path 15 Sensor unit 18 Discharge pipe 24 Ball valve 28 Air pipe 31 Air inflow pipe 32 Check valve 34 Pressurized air pipe 39 Switching valve 40 Ejector 45 Bypass pipe 48 Power line 66 Heater 67 Detection element

Claims (1)

[Claims] 1. A device for sequentially connecting a pump for pumping oil, a motor for driving the pump, a flow meter for measuring the pumped oil, a hose, and a nozzle, and means for generating a negative pressure, and one end The gas supply passage, which is opened near the tip of the nozzle and whose other end is connected to the negative pressure generating means, is provided at a position where the gas flowing through the gas supply passage is in contact with the gas supply passage according to the concentration of the gas to be measured. A gas sensor for generating a value output signal, a means for setting a comparison value, a nozzle detection switch for detecting the presence / absence of the nozzle at the refueling standby position and outputting a signal corresponding thereto, From the time required for the gas sucked from the start of gas suction to reach the gas sensor, the means for starting the suction of the gas through the gas supply passage triggered by the detection of the absence of the nozzle by the switch. And a determination means for generating an error signal when the output value of the gas sensor exceeds the comparison value between the start of the gas suction and the determination time elapses. Means and
An oil type discriminating apparatus provided together with a refueling device, comprising an informing means for notifying the occurrence of an error upon receipt of an error signal.