JPH0714760B2 - Refueling device with gas sensor - 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 to supply fuel oil to an automobile.

(B) Prior art and its problems At a gas station, a method of mechanically stopping the oil supply by the action of negative pressure generated by the Venturi effect is used as a method of detecting filling by using the flow velocity of the oil to be supplied ( For example, Japanese Patent Publication No. 53-28645) and a method using an optical sensor (for example, Japanese Unexamined Patent Publication No. 58-41095) are adopted, and float type and electrostatic capacitance type are also proposed.

However, those using the Venturi effect cause bubbles to malfunction due to the inclusion of air bubbles in the oil, and in the method using other sensors, it is necessary to install the sensor in the liquid contact part, and the oil runs out poorly. In some cases, or when dust was attached to the sensor that was wet with oil, malfunctions often occurred.

(C) Configuration for Solving Problems The present invention proposes an oil supply device that allows the sensor to be installed away from the liquid contact part and does not cause the above problems. To be more specific, first, oil gas is sucked through an air supply pipe extended to the vicinity of the discharge pipe of the oil supply nozzle, and a detected concentration value signal s corresponding to the concentration of the component gas to be detected is provided at a position in contact with this gas. Install a gas sensor that emits gas.

Secondly, a judgment value setting circuit in which a C value, which is a concentration value smaller than the maximum detected concentration value of the detection target component gas generated from the fuel oil type is set, and the detected concentration value and the C value are compared. And a determination circuit for performing the determination.

Alternatively, it is the rate of change of the detected concentration value of the gas sensor with respect to time, which is the value when the detected concentration becomes small α
A determination value setting circuit in which a value is set and a determination circuit for comparing the rate of change of the detected concentration value with time and the α value are provided.

Alternatively, a determination value setting circuit that stores the maximum detected concentration value of the detection target component gas generated from the fuel tank during refueling and outputs a set value signal that indicates an F value that is a calculated value smaller than the stored value, A determination circuit for comparing the detected density value and the F value is provided.

(D) Action When refueling work progresses and the oil level rises, the opening of the tip of the air supply pipe, which had been sucking oil gas in the fuel tank of the automobile until then, is immersed in oil. Therefore, this time, the oil gas generated from the surface of the oil that has entered the air supply pipe is sucked, and the amount of oil gas reaching the gas sensor at this time is extremely reduced. Therefore, the decrease in the concentration of the component gas to be detected contained in this oil gas is set to C in the determination value setting circuit.
Judge by comparing with the value, α value or F value,
That is, the determination circuit that determines that the fuel is filled outputs a refueling stop signal to stop refueling.

(E) Embodiment First, the first invention will be described below with reference to FIGS. 1, 2, 3, 4A, 4B, 5A and 8.

In FIG. 1, (1) is installed on an island (2) made of concrete in the housing of the refueling device.

(3) is a pump that pumps oil from an oil storage tank (not shown) through the oil feed pipe (4) and sends it to the flow meter (5).

(6) is a flow rate pulse transmitter, which outputs one flow rate pulse signal p every time the flow meter (5) measures a unit oil amount (for example, 1/100 liter).

(7) is a refueling nozzle, which is provided with a discharge pipe (8) at its tip, and is connected to the flowmeter (5) via a rotary joint (9), a hose (10), and a connecting pipe (11).

Reference numeral (12) is a nozzle detection switch, which outputs a detection signal m when the nozzle (7) is locked to the nozzle case (13) and outputs a non-detection signal n when it is removed.

(14) is an indicator box containing a fuel supply amount indicator (15), (16) is a pump motor for rotating the pump (3), (17) is a control unit containing an electric circuit described later, (1
8) is a notification buzzer.

(19) is a switching unit which is a negative pressure source, and an air supply pipe (21) extended from the compressor (20) and a nozzle (7).
To the sensor chamber (23) formed in the nozzle case (13) is connected to an air supply pipe (22) connected to the body (25) as shown in FIGS. 4A and 4B. An air passage (26) is formed in this.

(27) is an air cutoff valve assembled integrally with the body (25), which is a cylindrical valve body (28) and a spring which constantly urges the valve body (28) to close the air passageway (26). (2
9) and the electromagnetic coil (3) that pulls the valve (28) against the bias of the spring (29) when energized and opens the air passage (26).
0) and.

Reference numeral (31) is an injection nozzle, and when air is injected from the fine hole (32), negative pressure is generated in the negative pressure generation chamber (33) formed around the nozzle (31).

Since the principle of this negative pressure generation is already widely known, its explanation is omitted here.

A bypass passage (34) connects the air passage (26), the negative pressure generating chamber (33) and the air supply pipe (22).

Reference numeral (35) is an air switching valve, which is a cylindrical valve body (36) for communicating or blocking the air passage (26) and the bypass passage (34), and the valve body (36) is the bypass passage and the air passage (34). The bypass (3) includes a spring (37) that constantly urges the bypass (3) and a solenoid coil (38) that pulls the valve body (36) to open the bypass (34) when energized.
At the time of closing (4), the compressed air sent from the air passage (26) is guided to the injection nozzle (31) through the groove (39) cut around the valve body (36).

(40) is formed in front of the injection nozzle (31) and the air pipe (2
The air passage connecting to (4), (41) is a negative pressure control path that regulates the maximum negative pressure value by connecting the negative pressure generation chamber (33) to the atmosphere, and the inside of the negative pressure generation chamber (33) is at atmospheric pressure. If it exceeds, it is closed by a spherical check valve (42) made of lightweight resin or the like.

Reference numeral (43) is a ventilation plate that prevents the check valve (42) from moving into the negative pressure generating chamber (33).

In FIG. 3, (44) is a gas sensor, which is installed at a position where it comes into contact with the oil gas sent through the air supply pipe (24) guided into the sensor chamber (23) and is included in the oil gas. Detected concentration value signal s indicating a value corresponding to the concentration of the component gas to be detected, such as benzene, pentane or flammable components
Is output.

Reference numeral (45) is a wire mesh for preventing ignition provided at the outlet of the sensor chamber (23), and the sensor room (23) is open to the atmosphere through the wire mesh (45).

In FIG. 5A, (46) is a counting circuit, which is a flow rate pulse signal p.
Is counted, and the count value is output as a count value signal 1 to be displayed on the oil supply amount display (15) as the oil supply amount.

(47) is a pump motor drive circuit, and a refueling permission signal h
The pump motor (16) is energized by inputting the detection signal m, that is, when the refueling nozzle (7) is stored in the nozzle case (13) or the refueling stop signal r is input, the pump motor (16 ) Is stopped. When the small flow refueling start signal i is input, the pump motor (16) is rotated at a low speed.

(48) is a compressor drive circuit, and when the non-detection signal n is input, that is, the nozzle (7) is
When removed from 3), the compressor (20) is energized to generate compressed air, which is sent out to the air supply pipe (21), and the energization of the compressor (20) is stopped by stopping the input of the air blow signal w3 described later.

(49) is an air shutoff valve drive circuit, which is a nozzle detection switch (1
When the non-detection signal n is output from 2), that is, when the nozzle (7) is removed from the nozzle case (13), the air cutoff valve (27) is energized to open the air passage (26) and a blow signal described later. Turn off when w3 disappears.

(50) is a clock signal generation circuit that continues to output the clock signal q, (51) is the first determination circuit, and the value of the detected concentration value signal s when the gas sensor (44) does not detect the component gas to be detected at all And an intermediate value between the value when the maximum concentration of the oil type is being detected, and the refueling nozzle (7)
The value A in FIG. 8 is set as a value to be detected when is inserted into the fuel inlet (53) of the fuel tank (52) of the automobile, and the set value signal u indicating the value A is output.

(54) is a value that is slightly lower than the maximum value (B value in FIG. 8) when the gas sensor (44) in the second determination value setting circuit detects the component gas having the highest concentration in the oil type to be detected. The C value is set and the set value signal c indicating the C value is output.

(55) is the first determination circuit, which is the value of the detected concentration value signal s and the value of the set value signal u (A value) output from the gas sensor (44)
Are compared with each other (point e in FIG. 8) and the refueling permission signal h (one pulse) and the determination start signal v
Outputs (one pulse).

(56) is the detected concentration value signal s of the gas sensor (44) triggered by the input of the judgment start signal v in the second judgment circuit.
Value is compared with the value (C value) of the set value signal c, and when both values match the first time (point f in FIG. 8) and the second time when the detected density value signal s decreases. When it does (point g in FIG. 8), the refueling stop signal r (one pulse) is output, and when the first match occurs, the match signal x (one pulse) is output.
When the second match occurs, the match signal y (one pulse) and the notification signal z are output for a fixed time (for example, 10 seconds).

(57) is counted by counting the clock signal q by the timer A, and is t ₁ hours after the non-detection signal n is input (normal nozzle (7) is removed from the nozzle case (13) to the fuel filler port (53). The blow signal w ₁ is output for a time slightly shorter than the time required for insertion, for example, 2 seconds.

(58) counts the clock signal q by the timer B, and outputs the air blowing signal w ₂ for t ₂ hours (for example, 1 second) when the coincidence signal x is input. (59) is the timer C, and when the coincidence signal y is input, it is t ₃ hours (for example, 10
The air blow signal w3 is output for (for 2 seconds).

(60) is a timer D that counts the clock signal q, and when the coincidence signal x is input, a small flow refueling starts after t ₄ hours (for example, 5 seconds), which is the time until the foaming of the oil surface subsides. Output signal i.

(61) is an air switching valve drive circuit that drives the air switching valve (35) and opens the bypass passage (34) while any of the blow signals w ₁ , w ₂ , and w ₃ is being input.

The curve indicated by the alternate long and short dash line in FIG. 8 is the detected concentration value signal when the suction state is maintained without switching from the suction state to the air blowing state after the tip (63) of the air supply pipe (22) is immersed in oil. It is the value of s and stabilizes down to the D value.

With the above configuration, the first embodiment, which is the first embodiment of the first invention, will be described below.

When the refueling nozzle (7) is removed from the nozzle case (13) to start refueling, the output signal of the nozzle detection switch (12) changes from the detection signal m to the non-detection signal n, and the following operation is performed in response to this. Be done.

Zeroing of the count value in the counting circuit (46) (lubrication amount indicator (1
5) Zero display) Start of compressor (20) Open of air cutoff valve (27) (state of Fig. 4B) Open of air switching valve (35) due to generation of air blow signal w ₁ (air passage (26) To the bypass road (34)) (4B
Therefore, in the switching unit (19), the compressed air sent from the compressor (20) and the pressure storage tank (62) via the air supply pipe (21) is in the air passage (26) and the bypass passage (34). Through the pores (32) of the partial injection nozzle (31) to the air supply pipe (24) and the air supply pipe (22), but at this time, the negative pressure is generated in the negative pressure generation chamber (33). Since it does not occur and the pressure is higher than the atmospheric pressure, the check valve (42) moves to the position shown in FIG. 4B and closes the negative pressure control path (41) to prevent air from escaping, thereby cleaning air. Increase the efficiency of.

The compressed air (not containing oil gas) sent to the air supply pipe (24) was blown to the sensor (44) to clean the sensor (44), and then sent to the air supply pipe (22). The compressed air cleans the inside of the air supply pipe (24) (exhausts residual oil gas). Then, when t ₁ elapses, the air blowing signal w ₁ disappears, so that the biasing of the air switching valve (35) is stopped and the bypass passage (34) is closed by the valve body (36). (The state of FIG. 4A) Then, the compressed air sent to the air passage (26) cannot enter the bypass passage (34) and passes through the groove (39) of the valve body (36) and the injection nozzle ( It is injected only from the pores (32) of 31).

The air injection from the pores (32) generates a negative pressure in the negative pressure generating chamber (33) as described above, and sucks the outside air through the air supply pipe (22). The outside air sucked at this time has pores (32)
Is mixed with the jet flow from and sent to the air pipe (24) to reach the gas sensor (44). At this time, the negative pressure is generated in the negative pressure generating chamber (38), whereby the check valve (42) is displaced to the position shown in FIG. 4A to open the negative pressure adjusting path (41), and the outside air will continue to flow in. .

The effect of the negative pressure control path (41) will be described later.

When the discharge pipe (8) of the fuel filler nozzle (7) is inserted into the fuel filler port (53) (state of FIG. 1), oil gas in the fuel tank (52) flows from the tip (63) of the air supply pipe (22). Inhaled air tube (2
2), is sent to the sensor chamber (23) through the negative pressure generating chamber (33) and the air supply pipe (24) and comes into contact with the gas sensor (44). Then, the value of the detected concentration value signal s output from the gas sensor (44) increases and coincides with the A value set in the first judgment value setting circuit (51) (point e in FIG. 8) and the first judgment. The circuit (55) outputs the refueling permission signal h to energize the pump motor (16).

Then, the valve lever (64) of the nozzle (7) is operated to open a built-in valve (not shown) to supply oil.

When refueling progresses and the oil level (65) rises and the tip (63) of the air supply pipe (22) is immersed as shown in FIG. 2, the oil gas is sucked instead of the oil gas sucked up to that point. It will be.
In this case, only the oil gas that evaporates from the oil surface in the air supply pipe (22), that is, the inner diameter area, is not supplied to the gas sensor (44), and the amount of oil gas at that time is higher than that when sucking the oil gas itself. And extremely less.

Even if the amount of oil gas decreases, the amount of compressed air injected from the injection nozzle (31) does not change, and as a result, the concentration of oil gas decreases and the value of the detected concentration value signal s decreases.

When the air supply pipe (22) sucks in oil, the amount of outside air flowing in from the negative pressure control path (41) increases (when the air supply pipe (22) sucks oil gas and when sucking oil. There is a large gap in the pressure loss value, so that the oil level (66) in the air supply pipe (22) in FIG. 2 can rise only to the height indicated by H,
That is, even if the oil itself is sucked, the gas sensor (44)
The opening area of the negative pressure control path (41) is set so that it does not reach).

The value of the detected concentration value signal s drops and coincides with the C value set in the second judgment circuit (54) (first coincidence) (f in FIG. 8).
Point) and the second judging circuit (56) output a refueling stop signal r to deactivate the pump motor (16) and also output a coincidence signal x to cause the timer B (58) to count t ₂ hours.
For ₂ hours, the air switching valve (35) is energized to open the bypass passage (34) to send compressed air (for cleaning) to the air supply pipe (34) and the air supply pipe (22), especially the air supply pipe (22). Drain the oil that has entered from the tip (63) of the. At time t ₂ , the air switching valve (35) is deenergized and the bypass passage (34) is closed, so that the air supply pipe (22) starts sucking again, but at this time, the oil in the fuel tank (52) has already been consumed. Since the bubbling of the oil is stable and the oil level is stable below the tip (63) of the air supply pipe (22), the oil gas in the fuel tank (52) is sucked in again and the value of the detected concentration value signal s rises. To do.

On the other hand, the timer D (60) waits for the match signal x to be input.
When t ₄ has passed and outputs a small flow fueling start signal i is constant speed urging the pump motor (16). By doing so, the pump (3) is rotated slowly so that the supply speed is such that the discharge flow velocity from the nozzle (7) does not stir the oil, that is, does not cause bubbling, and the oil level rises again slowly this time. 2 and reaches the tip (63) of the air supply pipe (22), the value of the detected concentration value signal s decreases again and coincides with the C value of the second judgment value setting circuit (54) (eighth). Figure g
(2nd match), the refueling stop signal r is output from the second determination circuit (56), the pump motor (16) is deenergized, refueling is completed, and the match signal y is output and the timer is activated. C (59) t ₃ hour clock start and notification signal z
The buzzer (18) is activated by the output of.

Since the timer C (59) continues to output the air blowing signal w ₃ during the time t ₃ hours, the air switching valve (35) is energized during the time t ₃ and the air feeding pipe (24), sensor (44), air feeding pipe cleaning (22) is performed and t ₃ has elapsed is blown signal w ₃ disappears deenergizing the compressor (20), de-energized (valve closed) air shut-off valve (27), an air switching valve (35) Will be de-energized to prepare for the next refueling.

Since the compressor (20) is provided with a check valve (not shown) at the connecting portion with the air supply pipe (21), the compressed air in the pressure storage tank (62) is compressed even if the compressor (20) is deenergized. It does not leak through (20).

Further, the C value set in the second judgment value setting circuit (54) is set to such an extent that an erroneous judgment is not taken into consideration in consideration of the difference in sex of each manufacturer of oil, seasonal factors, and changes in oil gas concentration during refueling. The value is set.

Next, a second embodiment, which is a second embodiment of the first invention, will be described with reference to FIGS. 1, 2, 3, 4A, 4B, 5B and 8; The same symbols are used for the same parts and the same functional parts, and the description thereof will be omitted. The same applies to the third, fourth, fifth and sixth embodiments described later.

The difference between the second embodiment and the first embodiment is that the pump motor (16) in the first embodiment is energized by the input of the refueling permission signal h and the small flow refueling start signal i and the refueling stop signal. r
In the second embodiment, the pump motor (16) is energized by generation of the non-detection signal n output from the nozzle detection switch (12) and is generated by generation of the detection signal m. In addition to the fact that it is de-energized, an oil amount control valve (67), which was not in the first embodiment, is inserted in the connecting pipe (11) and an oil amount control valve drive circuit (68) is added. The oil amount control valve (67) is opened greatly when the oil supply permission signal h is generated and is opened slightly when the small flow oil supply start signal i is generated, and is closed when the oil supply stop signal r is generated.

That is, the first and second embodiments are different only in that the control of the oil supply is performed by the pump motor (16) or the oil amount control valve (67).

Subsequently, the third embodiment which is the first embodiment of the second invention
This embodiment will be described with reference to FIGS. 1, 2, 3, 4A, 4B, 6A and 8; however, the difference from the first embodiment is that instead of the second judgment value setting circuit (54) Detection concentration value signal s of gas sensor (44)
A third judgment value setting circuit (69) is provided for setting an α value which is a value when the detected density value which is a change rate with respect to time becomes small and for outputting a setting value signal d indicating this α value. The point and the clock signal q instead of the second determination circuit (56) are counted to calculate the rate of change of the detected concentration value signal s with time, and the calculated value is compared with the above α value. The third determination circuit (70) is provided for outputting a refueling stop signal r when the detected concentration value signal s and the two coincide with each other while the value of the detected concentration value s is decreasing. , The oil level rises and the first air pipe (2
The explanation is continued from the time when the tip (63) of 2) is reached.

As shown in Fig. 2, when the oil level (65) reaches the tip (63), the value of the detected concentration value signal s drops, and as shown in Fig. 8, the slope of the gas sensor output curve is expressed as an α value. When the value (the value of the setting signal d) matches (first match), the third determination circuit (70) outputs the refueling stop signal r to deactivate the pump motor (16) and also output the match signal x. to perform the cleaning of the trachea feed is timed to t ₂ hours timer B this t ₂ hours between air switching valve (35) is biased to have to open the bypass passage 834) (24) and feed pipe (22) Te .

When the time t ₂ has elapsed, the air switching valve (35) is deenergized and the bypass passage (34) is closed, so that the air supply pipe (22) starts sucking again, but at this time, the oil in the fuel tank (52) has already been exhausted. The bubbling has settled and the oil level is at the tip of the air pipe (22) (63)
Since it is stable in the state of falling below the temperature, the oil gas in the fuel tank (52) is again sucked in, and the value of the detected concentration signal s rises.

On the other hand, the timer D (60) waits for the match signal x to be input.
When t ₄ hours have elapsed, a small flow start signal i is output to energize the pump motor (16). By doing so, the pump (3) is rotated slowly so that the discharge speed from the nozzle (7) is supplied at a speed that does not stir the oil, that is, does not cause bubbling, and the oil level (65) again slowly again. When it rises to the position shown in FIG. 2 and reaches the tip (63) of the air supply pipe (22), the value of the detected concentration value signal s decreases and the rate of change of the value of the detected concentration value signal s with time is the third judgment. It coincides with the α value of the value setting circuit (69) (second coincidence).

Then, the refueling stop signal r is output and the pump motor (1
When 6) is deenergized and refueling is completed, the coincidence signal y is output and the timer c (59) starts timing t ₃ hours and the buzzer (18) is energized by outputting the notification signal z.

Since the timer C (59) continues to output the air blowing signal w ₃ during the time t ₃ hours, the air switching valve (35) is energized for the time t ₃ hours and the air supply pipe (24), sensor (44), When the air supply pipe (22) is cleaned and t ₃ time elapses and the air flow signal w ₃ turns off, the compressor (20) turns off and the air shutoff valve (2
7) and the air switching valve (35) are deenergized to prepare for the next refueling.

Next, the difference between the fourth embodiment, which is the second embodiment of the second invention, and the third embodiment based on FIGS. 1, 2, 3, 4A, 4B, 6B and 8 Explaining this, the pump motor (16) in the third embodiment causes the refueling permission signal h and the small flow refueling start signal i.
In the fourth embodiment, the pump motor (16) generates the non-detection signal n output from the nozzle detection switch (12), while the pump motor (16) is energized by the input of The oil quantity control valve (67), which is not provided in the third embodiment, is connected to the connecting pipe (1
1) and the oil quantity adjusting valve drive circuit (68) is added, and the oil quantity adjusting valve (67) is opened wide by the generation of the oil supply permission signal h, and the small flow oil supply start signal i It is opened small when it is generated and closed when the oil supply stop signal r is generated.

Therefore, the third embodiment and the fourth embodiment differ only in whether the control of the oil supply is performed by the pump motor (16) or the oil amount control valve (67).

Further, a fifth embodiment, which is the first embodiment of the third invention, will be described below with reference to FIGS. 1, 2, 3, 4A, 4B, 7A and 8; Is different from the second judgment value setting circuit (54) in that a fourth judgment value setting circuit (81) is provided. In the fourth judgment value setting circuit (81), the non-detection signal n is The highest value (B value in FIG. 8) of the detected density value signal s from the beginning of input is stored and a predetermined value (value obtained by subtracting E value in FIG. 8) from this stored value (8th value) A set value signal k indicating the F value in the figure) or a value (F value in FIG. 8) obtained by multiplying the above-mentioned highest value by a value less than 1 which is predetermined is output.

Hereinafter, the description of the fifth embodiment will be continued, but the description of the same parts as those of the operation of the first embodiment will be omitted, and when the oil level rises and reaches the tip (63) of the air supply pipe (22) for the first time. The explanation will be continued below.

As shown in FIG. 2, when the oil level (65) reaches the tip (63), the value of the detected concentration value signal s drops and matches the F value (first match) (point f in FIG. 8). ) And the second judgment circuit (56)
Outputs a refueling stop signal r to deactivate the pump motor (16) and outputs a coincidence signal x to timer B.
to measure a t ₂ h the t ₂ hours between air switching valve (35) to the bypass path by biasing the (34) to open the compressed air air line (for cleaning) (24) and feed pipe (22) The oil that has entered is discharged from the tip (63) of the air supply pipe (22).
When t ₂ time elapses, the air switching valve (35) is deenergized and the bypass passage (34) is closed, so that the air supply pipe (22) starts sucking again, but at this time, the oil in the fuel tank (52) has already been collected. Once the bubbling has subsided and the oil level is stable below the tip (63) of the air pipe (22), it is stable.
2) The oil gas inside is sucked in, and the value of the detected concentration value signal s rises.

On the other hand, the timer D (60) waits for the match signal x to be input.
When the time t ₄ has elapsed, a small flow refueling start signal i is output to energize the pump motor (16) at a constant speed. By doing so, the pump (3) is slowly rotated and the nozzle (7) is rotated.
The oil is supplied at a speed that does not stir the oil, that is, does not cause bubbling, and the oil level rises again to the position shown in Fig. 2 and reaches the tip (63) of the air supply pipe (22). Then, the value of the detected density value signal s falls again and coincides with the F value of the fourth judgment value setting circuit (81) (point g in FIG. 8) (second coincidence), so that the second judgment circuit (56) When the refueling stop signal r is output, the pump motor (16) is deenergized to end refueling, the coincidence signal y is output, and the timer C (59) starts counting time t ₃ hours and outputs the notification signal z. The buzzer (18) is activated.

Since the timer C (59) continues to output the air blowing signal w ₃ during the time t ₃ hours, the air switching valve (35) is energized during the time t ₃ and the air feeding pipe (24), sensor (44), air feeding pipe When the cleaning of (22) is performed and the blast signal w ₃ disappears after the lapse of t ₃ time, the compressor (20) is deenergized, the air cutoff valve (27) is deenergized (valve closed), and the air switching valve (35 ) Will be de-energized to prepare for the next refueling.

Next, a sixth embodiment, which is the second embodiment of the third invention, will be described with reference to FIGS. 1, 2, 3, 4A, 4B, 7B and 8; The difference from the fifth embodiment is that the pump motor (16) in the fifth embodiment is activated by the input of the refueling permission enable signal h and the small flow refueling start signal i, and the input of the refueling stop signal r. In contrast to the deenergization, in the sixth embodiment, the pump motor (16) is energized by the generation of the non-detection signal n output from the nozzle detection switch (12) and deenergized by the generation of the detection signal m. The oil quantity adjusting valve (67), which is not provided in the fifth embodiment, is inserted into the connecting pipe (11) and the oil quantity adjusting valve drive circuit (68) is added. The oil amount control valve (67) opens greatly when the oil supply permission signal h is generated and opens slightly when the small flow oil supply start signal i is generated, and the oil supply stop signal r is generated. In it is closed.

That is, the fifth embodiment and the sixth embodiment are different only in whether the control of the oil supply is performed by the pump motor (16) or the oil amount control valve (67).

(F) Effect As described above, the gas sensor is used to detect when the oil is full, so that the air flows through the oil as if negative pressure is generated by the oil flowing through the oil supply nozzle. There is no risk of malfunction due to mixing of oil bubbles and malfunction, and since the sensor does not come into direct contact with liquid such as optical sensors, floats, and static electricity sensors, there is no need to worry about sensor malfunction or malfunction. Is what you get.

[Brief description of drawings]

Fig. 1 shows the internal structure of the oil supply device, Fig. 2 shows the details of the tip of the discharge pipe, Fig. 3 shows the details of the sensor chamber, and Figs. 4A and 4B show the structure of the switching unit in different operating states. ,
5A and 5B show electric circuits in the first and second embodiments, FIGS. 6A and B show electric circuits in the third and fourth embodiments, and FIGS. 7A and B show fifth and fifth electric circuits, respectively. An electric circuit in a sixth embodiment is shown in a block diagram,
The figure shows the output curve of the gas sensor. (3) ... Pump, (5) ... Flowmeter, (7) ... Refueling nozzle (21), (22), (24) ... Air pipe, (23) ... Sensor chamber (27) ... Air shutoff valve, (35) ) ... Air switching valve (31) ... Injection nozzle, (33) ... Negative pressure generating chamber (42) ... Check valve, (43) ... Ventilation plate

Claims (11)

[Claims] 1. An oil feed pump, a flow meter for measuring oil pumped by the pump, an oil supply hose extending outside the housing and being an oil flow path connected to the flow meter, and an oil supply nozzle at the tip of the oil supply hose, An air supply pipe whose one end is extended to the vicinity of the discharge pipe of the oil supply nozzle and the other end is connected to the negative pressure generation source, and a position where it comes into contact with the gas sucked through this air supply pipe during the suction operation by the negative pressure generation source. Is a gas sensor for detecting the concentration of a detection target component gas generated from oil and generating a corresponding detection concentration value signal s, and the maximum detection concentration value of the detection target component gas generated from the fuel oil type. A determination value setting circuit that sets a C value, which is a density value smaller than the B value, and outputs a setting value signal c indicating the C value, and a value of the detected density value signal s and a value of the setting value signal c Detected by comparing with a certain C value Degrees values lubricator with gas sensor characterized by comprising a determination circuit for outputting a fueling stop signal r when the value of the signal s has reached the C value in the middle becomes smaller. 2. The oil supply device with a gas sensor according to claim 1, wherein the drive of the oil supply pump is stopped by the generation of the oil supply stop signal r. 3. The oil supply device with a gas sensor according to claim 1, wherein a valve provided in the oil supply passage is closed by the generation of the oil supply stop signal r. 4. An oil feed pump, a flow meter for measuring the oil pumped by the pump, an oil supply hose extending outside the housing and being an oil flow path connected to the flow meter, and an oil supply nozzle at the tip of the oil supply hose. An air supply pipe whose one end is extended to the vicinity of the discharge pipe of the oil supply nozzle and the other end is connected to the negative pressure generation source, and a position where it comes into contact with the gas sucked through this air supply pipe during the suction operation by the negative pressure generation source. Is a gas sensor that detects the concentration of a component gas to be detected generated from oil and generates a corresponding detected concentration value signal s, and the rate of change of the detected concentration value of this gas sensor with time. And a change rate of the value of the detected concentration value signal s with respect to time, and a determination value setting circuit that outputs a setting value signal d indicating this α value. is the value of d A refueling device with a gas sensor, comprising: a determination circuit that compares the α value and outputs a refueling stop signal r when they match. 5. The oil supply device with a gas sensor according to claim 4, wherein the drive of the oil supply pump is stopped by the generation of the oil supply stop signal r. 6. The oil supply device with a gas sensor according to claim 4, wherein a valve provided in the oil supply passage is closed by the generation of the oil supply stop signal r. 7. An oil feed pump, a flow meter for measuring oil pumped by the pump, an oil supply hose extending outside the housing and being an oil flow path connected to the flow meter, and an oil supply nozzle at the tip of the oil supply hose. An air supply pipe whose one end is extended to the vicinity of the discharge pipe of the oil supply nozzle and the other end is connected to the negative pressure generation source, and a position where it comes into contact with the gas sucked through this air supply pipe during the suction operation by the negative pressure generation source. Installed in the gas sensor that detects the concentration of the detection target component gas generated from oil and generates the corresponding detection concentration value signal s, and the maximum detection concentration value of the detection target component gas generated from the fuel tank during refueling. A determination value setting circuit for storing and outputting a set value signal k that is smaller than the stored value and indicates a density value F calculated by calculation based on the stored value; a value of the detected density value signal s and the set value; Value of signal k There F value and compares the detected concentration value signal s fueling device with gas sensor characterized by comprising in the middle of the value becomes smaller and a determination circuit for outputting a fueling stop signal r when reaches the F value. 8. An oil supply device with a gas sensor according to claim 7, wherein the drive of the oil supply pump is stopped by the generation of the oil supply stop signal r. 9. The oil supply device with a gas sensor according to claim 7, wherein a valve provided in the oil supply passage is closed by the generation of the oil supply stop signal r. 10. The gas sensor according to claim 7, wherein the F value is a value obtained by subtracting a predetermined value from the maximum detected concentration value of the detection target component gas generated from the fuel tank during refueling. Refueling device. 11. The F value is a value obtained by multiplying the maximum detected concentration value of the detection target component gas generated from the fuel tank during refueling by a predetermined numerical value less than 1. Refueling device with gas sensor.