JPH0741956B2 - Oil type discriminator installed alongside refueling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a device used in a gas station or the like for supplying fuel oil such as gasoline or light oil to an automobile.

(B) Prior art At a gas station, a plurality of types of oil such as gasoline and light oil are supplied side by side or installed separately in the same place.

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 for discriminating the type of oil by using a gas sensor such as Japanese Patent Application No. Sho 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.

Although there are various gas sensors that can be used in this case,
In terms of maintenance and price, contact combustion method,
The most effective is the gas sensor of the electrical detection method, which is represented by the semiconductor method and the heat conduction method.

The gas detection principle of each sensor is as follows.

In the catalytic combustion method, when a catalyst such as Pt or Pd is dispersed in an alumina sintered body and the combustible gas burns on the sintered body, the temperature of the sintered body rises. The phenomenon in which the resistance value of the Pt line changes due to this temperature rise is used.

The semiconductor method utilizes a phenomenon in which electric resistance changes when gas is adsorbed on the surface of a heated oxide semiconductor.

The heat transfer method uses the phenomenon that the resistance value of a heated Pt wire or thermistor changes depending on the difference in the thermal conductivity of the ambient gas.

(C) Problems to be Solved by the Invention The following problems occur when the gas sensor of the electrical detection system described above is adopted.

Electric detection type gas sensors are equipped with a heater regardless of the type, and when the detection element is not sufficiently heated by this heater, for example, it seems as though the target gas does not exist immediately after the start of energization. An output signal as if gas is present is generated for a short time, which causes malfunction.

Separate discriminator circuits were required to detect the failure of the heater incorporated in the gas sensor and the failure of the sensing element.

(D) Configuration for solving the problem The configuration for solving the problem that occurs when the gas sensor of the electrical detection method is adopted is a pump for pumping oil, a motor for driving the pump, and a pump for pumping oil. A device for sequentially connecting a flow meter for measuring oil, a hose, and a nozzle was installed side by side, and means for generating negative pressure and one end opened near the tip of the nozzle and the other end connected to the negative pressure generating means. The gas air supply passage, the detection element provided at the position where the gas flowing through the gas air supply passage is in contact, and the electric heater for heating the same are integrally incorporated, and the value corresponding to the concentration of the gas to be measured is set. A gas sensor for generating an output signal, a means for detecting the start of power supply to the electric heater, a switch means for blocking the power supply to the electric heater, and the detection element for cooling. Means for setting the cooling time required to consists of a comparator setting unit, a determining unit, and oil feeding control means, and notifying means.

(E) Operation According to the present invention, when the electric power supply to the electric heater is started, first, the electric power supply to the electric heater is forcibly stopped for a predetermined cooling time by the switch means.

When the cooling time ends and the power supply is restarted, the determination means performs the following operation.

Even if the output value of the gas sensor exceeds the comparison value during the period from the resumption of power supply until the monitoring time elapses, this is ignored and oil transmission is not permitted.

Determine whether the output value of the gas sensor exceeds the comparison value from the restart of the power supply until the monitoring time elapses,
If it does not exceed the limit, a sensor error signal will be output to notify and oil transmission will not be permitted.

(F) Embodiment In FIG. 1, reference numeral 1 is a refueling device, and one refueling amount indicator 2 and one alarm (display) 3 are provided on one side of the refueling device, and three nozzles 4 having different oil types, 4, 4 are provided, and the fuel supply amount indicator 2 and the alarm device 3 are shared by the three nozzles 4, 4, 4.

5 is a recess for mounting a fuel filler cap of an automobile, 6, 6 and 6 are nozzle cases for storing the nozzles 4, 4 and 4 in a standby state for fueling, It is a connected hose for oil supply.

FIG. 2 shows a system of the apparatus. Reference numeral 8 denotes a pump unit which is driven by a motor 9 and pumps oil from an oil storage tank (not shown) through an oil feed pipe 10 as well as a relief valve and a pump which bypass this pump. A strainer and a check valve installed on the upstream side, and an air separator and a filter installed on the downstream side of the pump are internally provided.

A flow meter 11 measures the amount of oil sent from the pump unit 8, and a number of flow rate pulse signals a corresponding to the measured amount are output from the flow rate pulse transmitter 12.

Reference numeral 75 denotes a connection fitting that connects the hose 7 and the oil supply pipe 13 and allows the gas supply passage 14 described later to be led out from the hose 7 in a liquid-tight state.

Reference numeral 15 is a sensor unit, 16 is a nozzle detection switch that outputs a nozzle detection signal b according to the presence or absence of the nozzle 4 in the nozzle case 6, and the nozzle detection signal b is in the H (high) state when the nozzle 4 is present. When not present, the state is L (low).

Reference numeral 17 is a control unit that houses an electric circuit described later.

In FIG. 3, reference numeral 18 denotes a discharge pipe connected to the tip of the nozzle 4, which has the following features.

Reference numeral 19 is a branch metal fitting, in which a T-shaped passage 23 having openings 20, 21, and 22 is formed, and the gas supply passage 14 extended from the sensor unit 15 is connected to the opening 20.

The passage 23 has openings 21 and 22 formed to have a small diameter, and a ball valve 24 is movably accommodated therein.
The opening (opening 21 in the figure) in the direction in which 24 is moved is closed.

The branch fitting 19 is 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, gas is always sucked from the suction hole located above regardless of the insertion direction of the discharge pipe 18, and oil gas heavier than the air discharged from the discharge pipe 18 is discharged. By sucking, the risk of false detection is eliminated.

28 is provided to detect bubbles and rise in oil level and stop refueling, and uses a venturi (not shown) to generate a negative pressure by the flow of oil and a negative pressure using the movement of the diaphragm. With the air pipe connected to the rise detection means,
Opening ends 29, 30 are provided on the pipe wall and the tip of the discharge pipe 18, 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 this is done, the oil supply to the nozzle 4 is stopped by the output signal from the negative pressure rise detecting means and the oil supply is ended. At this time, the oil is sucked into the air pipe 28 and remains, but it is discharged at the next oil supply. When the pipe 18 is inserted downwards into the oil supply port, the residual oil in the air pipe 28 is vigorously discharged from the open end 30 side, so that the oil is prevented from flowing into the suction holes 25, 26.

Reference numeral 31 denotes an air inflow pipe, which is opened in the discharge pipe 18 toward the downstream thereof and has an air inflow hole 33 connected to the outside air through a spherical check valve 32 made of a large amount of resin or the like.

When the tip of the discharge pipe 18 is submerged in the oil when the refueling is finished, the discharge pipe 18 is filled with oil, and the nozzle 4 is returned to the nozzle case 6 without being sufficiently discharged. If this happens, this oil will be spilled at the beginning of the next refueling.

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, even if the tip of the discharge pipe 18 is submerged in oil at the end of refueling, air will flow in from the air inlet 33 and all the oil in the discharge pipe 18 will be discharged. The problem at the start of refueling next time is solved.

The pressure wave generated when the discharge flow velocity of the nozzle 4 changes in an increasing direction causes oil to instantaneously change oil.
This oil flows through the inside, but this oil is introduced by the check valve 32 into the air inlet 33
Emissions from are blocked.

FIG. 4 shows the details of the gas sensor units 15 provided in pairs for each nozzle 4, which will be described below.

Reference numeral 34 is a pressurized air pipe connected to a compressed air generating means such as a compressor.The pressurized air that has passed through the air source valve 90, which is a two-way solenoid valve, is directly connected to each gas sensor unit 15. It has ports A, B, and C, and when it is not energized, it connects to port B and port C, and when it is 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 conduit 37.

38 is an electric detection type gas sensor, 39 is ports D, E, F,
When the pressurized air is not acting on the port I in the air switching spring return type switching valve having G, H, I, the ports D and H and the ports E and G are connected and the pressurized air acts. Port D, Port G and Port F
And port H are connected. However, this time port G is blocked.

An ejector 40 generates a negative pressure in the pipe 41 connected to the port F when pressurized air is supplied to the pipe 35.

42 is a throttle valve, 43 is an orifice that opens the middle of the gas supply pipe 14 to the atmosphere, and the oil reaches the gas sensor 38 even when sucking the oil itself by adjusting the negative pressure value of the gas supply passage 14. Is being prevented.

Although 44 is a closing valve provided in the bypass pipe 45 that bypasses the air source valve 90, and 46 is an orifice, since the closing valve 44 is normally closed, the air source valve 90 is closed (not energized). There is no inflow of compressed air to the downstream side.

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 the gas sensor 38.
Reaching the gas sensor 38 cleaning process and throttle valve
A cleaning process of the gas air supply passage discharged from the tip of the gas air supply passage 14 to the atmosphere through 42 → port D → port H is performed.

At this time, part of the pressurized air is released 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, in the switching valve 39, the port F and the port H are connected, and the gas sucked from the suction hole 26 flows through the air supply path 14 → port H → port F → the conduit 41, and the ejector 40 flows through the conduit 35. A sampling process is performed in which the gas is mixed with the pressurized air and then sent to the gas sensor 38.

The gas sucked at this time is also mixed with the atmosphere flowing 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 that has been input to the port I flows out into the atmosphere, so that the switching valve 39 connects the ports D and H again. Return to the cleaning process.

In addition, when the shut-off valve 44 is opened, the compressed air is sent to the gas sensor 38 and the gas air supply passage 14 through the bypass pipe 45, but the pressurized air is sent to prevent freezing in winter and temperature in the refueling device in summer. The gas sensor 38 is cooled against the rise, which helps prevent the change in the sensitivity due to the temperature change of the gas sensor.

FIG. 5 shows the circuit configuration of the control unit 17, and 47 is a power supply line provided at a place away from the oil supply device such as an office.
48 power switches.

49 is a compulsory switch that controls the power supply to the heater circuit of the sensor 38.

The reference numeral 50 determines whether or not the power supply line is energized, that is, whether or not electric power is being supplied to the heater circuit of the sensor 38 based on whether or not current is flowing, and when the electric power supply is started, the electric power supply start signal is supplied. A current change detection circuit that outputs c.

Reference numeral 51 denotes a forced open time setting circuit, which is the time Td required for cooling the detection element 67 to the extent that it cannot function when the power supply to the heater 66 for heating the detection element 67 (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.

Reference numeral 52 is a comparison value setting circuit, in which a sensor signal e which is an output signal of the gas sensor 38 is set as a value Sf when gasoline gas is detected, and this value is output as a comparison value signal f.

Reference numeral 53 is a monitoring time setting circuit, which sets the time Tj (for example, 5 seconds) required for the heating power of the heater 66 to be completely supplied to the power line 48 and the heater 66 to be completely warmed, and this setting value is monitored. It is output as a time signal j.

Reference numeral 54 is a clock signal generation circuit, which outputs a clock signal h.

55 is a first judgment time setting circuit, which starts suction through the gas supply passage 14, that is, a cleaning switching valve as described later.
A time Ti (for example, 2 seconds), which is slightly shorter than the time (for example, 3 seconds) required for the gas to be sucked and reaches the gas sensor 38 from the start of communication between the ports A and C at 36, is set, and the set value is set. It is output as the first determination time signal i.

56 is a second judgment time setting circuit, which is sufficiently longer than the time required for the sucked gas to reach the gas sensor 38 after starting suction through the gas supply passage 14 (the previous 3 seconds).
Tk (for example, 10 seconds) is set, and the set value is output as the second determination time signal k.

Reference numeral 57 is a determination circuit, which selectively outputs a switch open signal m, an error signal n, a sensor abnormality signal p, and a determination signal r according to the input of various signals.

Reference numeral 58 denotes an annunciator drive circuit, which operates the annunciator 3 to give an alarm based on the input of a signal described later.

Reference numeral 59 is a start-up cleaning time setting circuit, which is set to a time Ts (for example, 2 seconds) required for removing the nozzle 4 from the nozzle case 6 and inserting the nozzle 4 into a fuel filler port of an automobile (not shown). The value is output as the starting cleaning time signal s.

Reference numeral 60 denotes an end cleaning time setting circuit, which sets a cleaning interval Tt (for example, 3 seconds) which is performed after the nozzle 4 is returned to the nozzle case 6, and outputs this set value as an end cleaning time signal t. is doing.

Reference numeral 61 denotes a flow velocity change detection circuit, which is used when the flow rate pulse signal a is input after the nozzle detection signal b is changed to the L state and the input cycle of the flow rate pulse signal a becomes long, that is, the nozzle 4
When the built-in valve is closed, the passage is closed or narrowed down by an oil passage control valve described later, and the number of rotations of the motor 9 is reduced, it is determined that the refueling work is almost completed, and the flow velocity change signal u ( One pulse) is output.

Reference numeral 62 is a cleaning switching valve control circuit, which is triggered by the input of the judgment signal r and the change of the nozzle detection signal b to the L state.
Time is measured, and when it is finished, the cleaning switching signal w is output, and the determination start signal g (one pulse) is output when the time Ts has elapsed from the L state of the nozzle detection signal b. When the time has elapsed, the original valve closing signal x (one pulse) is output.

Reference numeral 63 denotes an air source valve control circuit which changes the nozzle detection signal b to the L state until the air source valve closing signal x is input or the flow velocity change signal u is input to change the nozzle detection signal b to the H state. Until the end cleaning time Tt elapses, the valve opening signal y is output to open the air source valve 90.

A pump motor control circuit 64 outputs a motor drive signal z to rotate the pump motor 9 from when the determination signal r is input until the nozzle detection signal b is in the H state and changes.

Reference numeral 65 is a counting circuit, which calculates the amount of oil supply by counting the number of flow rate pulse signals a that are zeroed due to the change of the nozzle detection signal b to the L state, and the calculated result is the amount of oil supply signal v Is displayed and displayed on the refueling amount display 2.

In FIG. 10 showing the semiconductor type gas sensor, 66 is a heater for heating the detection element 67 of the gas sensor 38, 68 to 71.
Is a terminal, Va is a heater voltage, Vb is a circuit voltage, Vc is an output voltage, R is a load resistance, the heater voltage Va and the circuit voltage Vb are applied by the power line 48, and the presence of gas causes the detection element 67 to The resistance value changes, which appears as a change in the output voltage Vc, and is output as a change in the sensor signal e. There is a case where the detection element also serves as a heater as in the contact fuel method, but for convenience sake, description will be given as another functional part.

Based on the above configuration, the description will be continued below according to the operations of the opening and refueling work.

When the power switch 47 is closed (ON) at the time of opening a store, the compulsory 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 detects the power supply start signal c ( One pulse) is output.

Then, the determination circuit 57 outputs the switch open signal m to set the contact of the forced switch 49 to Td set in the forced open time setting circuit 51.
Let it open for hours.

When the time Td has elapsed, 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 when the output of the switch open signal m is stopped. Will not be output and the power supply to the heater 66 will continue to be allowed.

However, when a power failure occurs and then returns, the output of the switch open signal m is not stopped, and therefore the same operation as when the power switch 47 is first closed is performed.

Then, the determination circuit 57 determines the value of the sensor signal e and the set value Sf set in the comparison value setting circuit 52 from the stop of the output of the switch open signal m to the elapse of the Tj time set in the monitoring time setting circuit 53. In comparison, as shown in FIG. 6, if the sensor signal e changes and the former value exceeds the latter value, the gas sensor 38
Does not cause any particular operation as normal, but if not exceeded, it is determined that some abnormality has occurred in the heater 66 or the detection element 67 of the gas sensor 38, and the sensor abnormality signal p
Is output and the alarm 3 is notified.

On the other hand, at this time, even if the value of the sensor signal e exceeds the value of the set value Sf, it is not due to the presence of gasoline gas, and therefore the determination circuit 57 does not output the determination signal r, that is, does not permit refueling.

In the above description, when the power supply start signal c is generated, the forced switch 49 is opened at the time Td, that is, the time until the detection element 67 cools.
Since the detection element 67 is not cold when the power supply to the gas sensor is restarted, in this case the sensor signal e does not change as shown in FIG. 6, that is, it does not exceed the set value Sf. This is to prevent the occurrence of abnormalities.

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 or not it is gasoline gas. A value may be set.

After that, when the customer comes to desire gasoline and takes out the nozzle 4 for gasoline 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. The above operation is performed.

The count value of the counting circuit 65 is reset to zero.

The air source valve control circuit 63 outputs the valve opening signal y to output the air source valve.
Open 90.

The cleaning switching valve control circuit 62 starts counting by counting the clock signal h, and outputs the cleaning switching signal W to energize the cleaning switching valve 36 after the lapse of Ts time set in the starting cleaning time setting circuit 59. From the communication state between port B and port C, port A and port C
Switch to the communication state with.

That is, until the time Ts elapses, the pressurized air is air source valve 34 → pipe 35 → ejector 40 → gas sensor 38 and pipe 35 → throttle valve 42 → port D → port H → gas air passage 14
The cleaning process is sent to the pipeline, and when the Ts time elapses, the compressed air passing through the ejector 40 causes the pipeline to flow.
Gas is sucked from the tip of the gas supply passage 14 by the action of the negative pressure generated in 41, and the gas supply passage 14 → port H → port F → pipe 41
→ The sampling process from the ejector 40 to the gas sensor 38 will be performed.

When the Ts time elapses, the cleaning switching valve control circuit
62 outputs the judgment start signal g.

The judgment circuit 57 counts the clock signal h when the judgment start signal g is input, so that the Ti time set in the first judgment time setting circuit 55 and the second judgment time setting circuit 56 are set.
When the time Tk 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 during the time Ti, the gas sensor 38 is not sufficiently cleaned. Judgment is made and the error signal n is output, and the alarm 3
And the determination signal r is not output.

When 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 there is a possibility that the vehicle is not a gasoline-powered vehicle. Therefore, an 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 a motor drive signal z to energize the pump motor 9 and bring it into a refuelable state.

The cleaning switching valve control circuit 62 stops the output of the cleaning switching signal w and deactivates 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 of this time is performed from the input of the determination signal r until the Ts time set in the starting cleaning time setting circuit 59 elapses, and after the Ts time elapses, the air output from the cleaning switching valve control circuit 62 is output. When the source valve closing signal x is generated, the air source valve control circuit 63 stops the output of the valve opening signal y and cuts 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 the 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 termination cleaning time setting circuit 60 by counting the clock signal h, and when the Tt time elapses, the output of the valve opening signal y is stopped, The original 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.

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 may be 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 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, refueling should be permitted on condition that gasoline gas is not detected even if a fixed time (a time sufficient for the gas to reach the gas sensor 38) has elapsed since the nozzle 4 was inserted into the refueling port. Alternatively, refueling may be permitted when only the presence of a thin gas (gas of light oil or kerosene is thinner than gasoline) is confirmed.

In this embodiment, the comparison value Sf is set to determine whether or not it is gasoline gas, and this value and the value of the sensor signal e are compared, but the rate of change of the value of the sensor signal e with time ( The change rate of gasoline gas is large and the change rate of light oil or kerosene gas is small), and the judgment is made from this calculated value, or the change value from the value of sensor signal e at the end of the cleaning process at the start of refueling operation. It is also possible to make a judgment based on.

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 connecting the forcible switch 49 and the gas sensor 38, and 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.

When the power switch 47 is closed (ON), the cleaning process is performed for a certain period of time, and condensation occurs at night and the gas sensor
The water droplets adhering to the 38 and the case that covers it are evaporated or blown off to facilitate the passage of gas.

As shown in FIG. 5, by adding a heater for heating the case of the sensor that covers the gas sensor 38, gas passage failure due to freezing in winter is prevented.

When the shape of the nozzle case 6 is changed so that the discharge pipe 18 of the nozzle 4 is stored downward when not refueling, the discharge pipe 18
Since the oil remaining inside will be discharged, the discharge pipe 18
It is possible to prevent the risk of malfunction by detecting the oil gas flowing out from the.

While the nozzle 4 is housed in the nozzle case 6, air is blown toward the discharge pipe 18 to evaporate the oil attached to the discharge pipe 18.

In the case where the discharge pipe 18 of the nozzle 4 is housed in the nozzle case 6 facing upward as in the present embodiment without adopting the above-described method, when the discharge pipe 18 is housed in the nozzle case 6 at the time of housing, the inside of the discharge pipe 18 is opened. A valve for discharging oil is provided in the nozzle 6.

In the above, 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.

A valve lid is provided that normally closes the opening 80 at the tip of the discharge pipe 18 to limit the outflow of oil and open with the oil discharge pressure.

(G) Effect As explained above, when the gas sensor of the electrical detection method is adopted, when the power supply to the heater that heats the detection element of the gas sensor is started, the output signal of the gas sensor is Even if it changes as if it exists, it does not permit refueling based on this change. Furthermore, whether or not both the detection element of the gas sensor and the heater are normal is judged by the presence or absence of this change. The abnormality determination of the gas sensor that occurs when the detection element is not sufficiently cooled at the time of recovery from a power outage is stopped by temporarily cooling the detection element, so there is little malfunction and an oil type determination device that can be used with confidence can be obtained. It is a thing.

[Brief description of drawings]

FIG. 1 is a view showing an external appearance of a fuel supply device, FIG. 2 is a view showing a related state of a fuel supply device and an oil type discrimination device, FIG. 3 is a view showing a structure of a discharge pipe of a nozzle, and FIG. FIG. 5 is a diagram showing a configuration inside the gas sensor unit, FIG. 5 is a diagram showing a block diagram of an electric circuit in the control unit, and FIG. 6 is a power switch closed (O.
Fig. 7 shows the change in sensor output during N), Fig. 7 shows the change in sensor output when switching from the gas sampling process to the cleaning process, and Fig. 8 shows the system flow during refueling work. FIG. 9 is a diagram showing a system flow when the power switch is closed (ON), and FIG. 10 is a diagram showing a basic circuit of the gas sensor. 1 ... Lubrication device, 2 ... Lubrication amount indicator 3 ... Alarm device, 4 ... Nozzle, 6 ... Nozzle case 7 ... Hose, 8 ... Pump unit 11 ... Flowmeter, 14 ... Gas feed Airway 15 …… Sensor unit, 18 …… Discharge pipe 24 …… Ball valve, 28 …… Air pipe 31 …… Air inlet pipe, 32 …… Check valve 34 …… Pressurized air pipe, 39 …… Switching valve 40 …… Ejector, 45 …… Bypass pipe 48 …… Power supply line, 66 …… Heater 67 …… Detection element

Claims (3)

[Claims] 1. A pump for pumping oil, a motor for driving the pump, a flow meter for metering the pumped oil, a hose, and a device connected in sequence to a nozzle, which are connected to each other to generate negative pressure. A gas feed passage opened near the tip of the nozzle and connected to the negative pressure generating means at the other end, and a detection element provided at a position where the gas flowing through the gas feed passage is in contact, and an electric heater for heating the detection element. And a gas sensor that generates an output signal having a value corresponding to the concentration of the gas to be measured, a means for detecting the start of power supply to the electric heater, and a change in the output signal of the gas sensor. A means for setting a fixed time as a monitoring time, a means for setting a comparison value, and a judgment means for judging the oil type by comparing the value of the output signal of the gas sensor with the comparison value. The monitoring in the course of time the oil type discrimination apparatus which is parallel in the fuel supply apparatus comprising a fuel delivery control means for disabling the original Nuisance oil feed to the determination of the determination means for starting the start of power supply. 2. A pump for pumping oil, a motor for driving the pump, a flow meter for metering the pumped oil, a hose, and a device connected in sequence to a nozzle, and are provided with a means for generating negative pressure and one end. A gas air supply passage opened near the tip of the nozzle and having the other end connected to the negative pressure generating means; a detection element provided at a position in contact with gas flowing through the gas air supply passage; and an electric heater for heating the detection element. , A gas sensor that generates an output signal of a value corresponding to the concentration of the gas to be measured, a means for detecting the start of power supply to the electric heater, and a change in the output signal of the gas sensor A means for setting a fixed time as a monitoring time, a means for setting a comparison value, and an output value of the gas sensor is set to be equal to the output value of the gas sensor during the elapse of the monitoring time starting from the start of the power supply. A determining means for generating a sensor error signal on the condition that it does not exceed a comparison value, sensor error signal oil type discrimination apparatus juxtaposed occurs fueling device comprising a notification means for notifying a sensor abnormality by receiving the. 3. A switch means forcibly forcibly blocking the power supply when the power supply start detecting means detects the start of power supply to the heater, and the detection is carried out when the heating state is already present at the time of the forcible stop. The control means for measuring a predetermined cooling time required for cooling the element, and for releasing the forcible inhibition by the switch means and restarting the power supply to the heater after the cooling time is counted. An oil type discriminating device that is installed side by side with the refueling device described in.