JPH0637239B2 - Oil supply device with oil type 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) Conventional technology At a gas station, devices for supplying a plurality of types of oil, for example, gasoline and light oil, are installed side by side or separately on the same site. However, because the external shape of the refueling device is the same, the vehicle may stop by mistake, and as a result, there are frequent accidents in which light oil is supplied to a gasoline vehicle or gasoline is supplied to a light oil vehicle. It is necessary to drain the oil from the fuel tanks and the oil passages, which requires a large amount of expenditure and labor.

On the other hand, as a method for determining the type of oil, there is a method utilizing the relative permittivity and light transmittance found in JP-A-61-95245.

The former is to judge from the change in the capacitance value between the two electrodes when the sensor part having positive and negative electrodes is immersed in oil, and the latter is to make the light emitting part and the light receiving part face to face each other. When there is an object, it is determined by the intensity of light received by the light receiving unit.

Further, Japanese Utility Model Publication No. 51-2332 discloses that a gas sensor is used to detect the presence of fuel gas (the type of oil cannot be determined) and the refueling device is controlled.

(C) Problems to be solved by the invention When an attempt is made to determine the type of oil in a fuel tank of an automobile by adopting the method of detecting the relative permittivity or the light transmittance as a method of determining the oil type. Causes the following problems.

First, a car that is going to receive refueling generally has a small amount of oil remaining in the fuel tank, and the distance from the refueling port to the oil becomes long. When the sensor is attached to the nozzle without dipping, the sensor has to have a structure that pops out from the nozzle only when it is detected, which complicates the drive mechanism and occupies a large space, and the operability of the nozzle itself is poor. Become.

Secondly, depending on the vehicle model, the pipe connecting the fuel filling port and the fuel tank may be extremely bent, and the sensor may not reach the oil.

On the other hand, the gas sensor type does not have a function to judge the type of oil, it only detects the oil supply port and permits oil supply, and the sensor itself is attached to the tip of the discharge pipe of the nozzle. Therefore, if the oil level rises and the sensor sinks in the oil, the sensor may be damaged.

Therefore, the applicant of the present invention has proposed a gas sensor-equipped refueling device (Japanese Patent Application No. 62-205554) which solves the problems caused by adopting the gas sensor.

However, even if this proposal is adopted, the components to be detected contained in the oil gas near the fuel filler are diluted due to the fact that the cap of the fuel filler of the automobile is left open for a long time. In this case, the oil type may be misjudged.

This misjudgment is that when gasoline and light oil are compared, it is determined that the type of oil in the fuel tank in the device for supplying light oil in which the detection component gas, for example, benzene gas or combustible gas, is relatively thin is gasoline, but it is light oil. There is a problem when making a decision.

An object of the present invention is to correct this erroneous determination and stop the refueling when such an erroneous determination is made and refueling is started.

(D) Means for Solving Problems The present invention is intended to achieve the above object. It has the following configuration.

As an oil gas collecting means, a gas sensor is provided at a position where the air passage is extended to the vicinity of the discharge pipe of the nozzle and the gas is in contact with the gas sucked through the air passage.

As means for determining the type of oil, the output value output by the gas sensor when detecting G oil that generates a high-concentration detection target component gas and the gas sensor when detecting D oil that generates a low-concentration detection target component gas A second judgment value setting circuit for setting a B level value between the output value to be output, and a second judgment circuit for comparing the output value of the gas sensor with the B level value by deciding a monitoring time after the start of oil feeding. To provide.

Alternatively, the value of the change rate ζ, which is a value between the change rate of the output value of the gas sensor when G oil is detected and the change rate of the output value of the gas sensor when D oil is detected, is set. A third judgment value setting circuit and a second calculation judgment circuit that determines the monitoring time and compares the change rate of the output value of the gas sensor with the value of the change rate ζ are provided.

An air blowing / suction switching mechanism is provided as a cleaning means for the gas sensor.

(E) Action If the output value of the gas sensor or the rate of change thereof exceeds the B level value or the rate of change ζ from the start of refueling until the monitoring time elapses, the second judgment circuit or the second calculation judgment circuit A refueling stop signal is output to stop refueling.

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

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

(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 lubrication nozzle, equipped with a discharge pipe (8) at the tip,
It is connected to the flowmeter (5) via (9), hose (10), and connecting pipe (11).

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

(14) is the indicator box that stores the refueling amount indicator (15), (1
6) is a pump motor for rotating the pump (3), (17) is a control unit that houses an electric circuit to be described later, (18) is a notification buzzer, and (19) is an air valve mechanism for compressed air such as a compressor. The air supply pipe (20) extended from the source and the air supply pipe (22) connected to the air blow suction switching mechanism (21) of the nozzle (7) are connected, and the hinge (23) provided in the nozzle case (13) The communication between the air supply pipe (20) and the air supply pipe (22) is cut off by the displacement operation of the nozzle (7) of the plate (24) which can be rotated and swung around the nozzle (7).

(25) is a lever for opening and closing a built-in valve (not shown) of the nozzle (7), (26) is a ventilation passage extended to the vicinity of the tip opening (27) along the discharge pipe (8), and (28) is Car fuel tank (2
It is the filler port of 9).

2A and 2B show the structure of the air valve mechanism (19).
In the cylinder chamber (31) formed in the
The piston valve (33) that forms 2) is slidably provided, and the knob (3) at the right end of the piston valve (33) extends to the outside of the body (30) and its tip abuts against the plate (24). 34) is formed, and the knob (34) is attached to the main body (30) by the spring (35).
Is urged in a direction projecting outward.

(36) and (37) are through holes that connect the air pipe (20) and the air pipe (22) to the cylinder chamber (31), respectively, and the nozzle (7) is the nozzle case.
When removed from (13), the piston valve (33) assumes the position shown in Fig. 2A, and the through hole (36) and the through hole (37) form the cylinder chamber (31).
The compressed air, which is communicated through the recess (32) of the piston valve (33) and is sent through the air supply pipe (20), is delivered to the air supply pipe (22).

On the other hand, when the nozzle (7) is returned to the nozzle case (13), the plate (24) resists the bias of the spring (35) and the hinge (23).
The piston valve (33) is also moved to the left and the recess (32) is disengaged from the through hole (37), so that the air supply pipe (20) and the air supply pipe (22) are displaced. The communication with is cut off and the supply of compressed air to the air supply pipe (22) is stopped.

Numerals (38) and (39) are sealing O-rings mounted on the piston valve (33), and numeral (40) is an air hole for opening the cylinder chamber (31) to the outside air.

Figures 3A and B show the structure of the blower suction switching mechanism (21).
An air supply passage (45) connecting the air supply pipe (22) and the air injection nozzle (42) to the main body (41), an atmosphere opening passage (43) in front of the nozzle (42),
Negative pressure generating chamber (44) around the nozzle (42) Bypassing the nozzle (42), connecting the air supply passage (45) and the negative pressure generating chamber (44), and connecting to the ventilation passage (26) 46), a sensor room (4) equipped with a gas sensor (47) on the open air path (43)
8), Cylindrical valve body (49) for disconnecting the communication between the air supply passage (45) and the bypass passage (46) Energize the valve body (49) in the direction in which the bypass passage (46) is closed. It consists of a spring (50) and an electromagnetic coil (51) that displaces the valve body (49) when energized against the bias of the spring (50) to open the bypass passage (46). The coil (51) constitutes the solenoid valve (52) for air.

Reference numeral (53) is a groove formed on the outer periphery of the valve body (49), and in FIG. 3A, the air supply passage (45) and the nozzle (42) are communicated with each other through the groove (53).

In this air suction / suction switching mechanism (21), when the valve body (49) is in the state shown in FIG. 3A, that is, when the electromagnetic coil (51) is not energized, the compressed air sent from the air supply pipe (22) is discharged from the nozzle (42). )
Is injected only from the outside, and at this time, a negative pressure is generated in the negative pressure generation chamber (44) by this injection air, and the outside air is sucked in through the ventilation path (26).

However, when the electromagnetic coil (51) is energized and the valve body (49) is in the position shown in FIG. 3B, most of the compressed air sent from the air supply pipe (22) does not pass through the nozzle (42). The gas flows into the bypass passage (46), and as a result, outflow from the ventilation passage (26) and discharge from the atmosphere opening passage (43) through the negative pressure generating chamber (44) are performed (at this time, the gas sensor (47 ) And the ventilation path (26) are to be cleaned by an air flow that does not contain oil and gas) No negative pressure is generated in the negative pressure generating chamber (44).

Note that the principle of negative pressure generation in the negative pressure generation chamber (44) is widely known, so description thereof will be omitted.

In FIG. 5A, (54) is a counting circuit which counts the number of flow rate pulse signals p and outputs the count value as the oil supply amount signal 1. It should be noted that this count value is received when the detection signal m is changed to the non-detection signal n, that is, when the nozzle (7) is in the nozzle case.
It is zeroed when removed from (13).

(55) indicates a clock signal generating circuit for outputting a clock signal q, (56) indicates a first judgment value setting circuit for outputting a setting signal u indicating an A level value described later, and (57) indicates a B level value described later. It is a second determination value setting circuit that outputs a setting signal w.

Reference numeral (58) is the first determination circuit, which compares the detection signal s of the gas sensor (47) with the setting signal u, and when the value of the detection signal s exceeds the value (A level value) of the setting signal u. Start counting the clock signal q, compare the value of the detection signal s with the value of the setting signal w for t ₂ time (for example, 1 second) required for a predetermined determination, or detect at the end of t ₂ time. The value of the signal s and the value of the setting signal w are compared, and the refueling permission signal x is provided on the condition that the former value does not exceed the latter value.
(One pulse) is output, and at the same time, the determination start signal v (one pulse) is output.

Reference numeral (59) is a second judgment circuit, which counts the clock signal q triggered by the input of the judgment start signal v, and measures a predetermined monitoring time t ₃ hours (for example, 3 seconds). t ₃ hours detection signal s value as the setting signal w value and by comparing the fueling stop signal y former exceeds the latter between
(One pulse) is output, and the blower signal r ₁ is output after t ₃ hours have elapsed.

(60) is a timer circuit, and the nozzle (7) is inserted into the fuel filler port (28) triggered by the change from the detection signal m to the non-detection signal n, that is, the nozzle (7) is removed from the nozzle case (13). The blast signal r ₂ is output for t ₁ hours (for example, 2 seconds) which is the time normally required until the air is blown.

(61) is a solenoid valve drive circuit, the output signal of the nozzle detection switch (12) is changed from the non-detection signal n to the detection signal m while the blower signal r ₂ is input or after the blower signal r ₁ is input. Until it changes, that is, the nozzle (7) is
Until it is returned to (3), the solenoid valve (52) is energized and the air pipe (2
The bypass passage (46) is communicated with 2), and the gas sensor (47) and the ventilation passage (26) are cleaned.

(62) is a pump motor drive circuit, and the refueling permission signal x is provided on condition that the non-detection signal n is input, that is, the nozzle (7) is removed from the nozzle case (13). When input, the pump motor (16) is energized and rotated, and this energized state is maintained until the detection signal m is input or the refueling stop signal y is input.

FIG. 4A is a change curve of the detection signal s with respect to time. For example, when benzene, pentane, or a flammable gas is targeted, a difference occurs in the detected value between gasoline (G oil) and light oil (D oil). .

That is, in the case of G oil gas, since the gas component to be detected is contained in a relatively large amount, the detection signal s output from the gas sensor (47) greatly changes as seen in the G oil gas detection curve. However, in the case of D oil gas, since the detection target gas component is contained in a relatively small amount, the change of the detection signal s is not large.

In addition, the curve represented by the two-dot chain line is the long-time lubrication port (28)
This is a curve when the G oil gas in the vicinity of the oil supply port (28) was diluted and the state was detected because the cap (not shown) was removed.

The A level value shown by the dashed line is set to be smaller than the value of the detection signal s, that is, the output value of the gas sensor (47) when D oil gas is detected, and the B level value also shown by the dashed line. Is set so that the value of the detection signal s is larger than the value when D oil gas is detected but smaller than the value when G oil gas is detected.

1 and 2A and 2B of the first invention in the above configuration
The first embodiment will be described below with reference to FIGS. 3, 3A, B, 4A, and 5A.

First, the nozzle (7) is removed from the nozzle case (13), and the following operation is performed.

(A) In the air valve mechanism (19), the air supply to the air supply pipe (22) is started by the displacement of the piston valve (33).

(B) When the non-detection signal n is generated, the previous count value in the counter circuit (54) is zeroed.

(C) The purpose of cleaning the gas passage (26) with the air flow (26) during the time t ₁ (between points a and b in Fig. 4) due to the generation of the air flow signal r ₂ . Done in).

Then, when the time t ₁ has elapsed (point b), the air blowing signal r ₂ disappears, so that the energization of the solenoid valve (52) is stopped, whereby suction is started in the ventilation path (26) instead of air blowing.

The discharge pipe (8) of the nozzle (7) is inserted into the filler port (28) and the ventilation passage (2
The oil gas in the fuel tank (29) sucked through 6) is mixed with the air flow injected from the nozzle (42) through the negative pressure generation chamber (44) in the blower suction switching mechanism (21), Sensor room (4
It is released to the atmosphere through 8).

At this time, a part of the oil gas reaches the gas sensor (47), and thus the gas sensor (47) outputs a detection signal s corresponding to the concentration of the gas to be detected.

When the oil in the fuel tank (29) is D oil (light oil), the sensor output along the D oil gas detection curve (detection signal s)
When the value of the detection signal s reaches the A level value (point C) which is the setting value (value of the setting signal u) of the first judgment value setting circuit (56), the first judgment circuit (58) t ₂ hours start counting
Refueling is permitted on condition that the value of the detection signal s does not reach the B level value which is the setting value (value of the setting signal w) of the second judgment value setting circuit (57) when t ₂ time has elapsed (point d). The signal x is output.

On the other hand, when the oil in the fuel tank (29) is G oil (gasoline), the value of the detection signal s reaches the A level value (point f), and after the lapse of t ₂ hours (point g) B Since the level value is exceeded, the refueling permission signal x is not output.

The pump motor (16) is urged by the output of the refueling permission signal x to be in a refuelable state, and when the lever (25) of the nozzle (7) is pulled, a built-in valve (not shown) is opened to refuel.
Since the first determination circuit (58) outputs the determination start signal v at the same time as the refueling permission signal x is output, the second determination circuit (59) measures the monitoring time t ₃ hours at the same time as the determination start signal v is input. If the value of the detection signal s does not exceed the B level value, that is, the value of the setting signal w during this time t ₃ (it does not exceed if it is D oil), after the time t ₃ elapses (point e) Blast signal
As r ₁ is output, the solenoid valve (52) is energized to the state shown in FIG. 3B, the air passage (26) is switched from the suction state to the air blowing state, and the air passage (26) and the gas sensor (47 ) Cleaning is performed to prepare for the next detection.

By ejecting air through the air passage (26), even if the oil level in the fuel tank rises, the oil is prevented from entering the air passage (26).

Further, during refueling, the counting circuit (54) counts the number of flow rate pulse signals p, and the refueling amount display (15) displays the refueling amount.

When the refueling work is completed and the nozzle (7) is returned to the nozzle case (13) and the output of the nozzle detection switch (12) changes from the non-detection signal n to the detection signal m, the pump motor (16) is energized. At the same time, the solenoid valve (52) is also de-energized.

On the other hand, when the nozzle (7) is returned to the nozzle case (13), the piston valve in the air valve mechanism (19) is displaced against the bias of the spring (35) to the position shown in FIG. (36) and through hole
Since the communication of (37) is cut off, the supply of compressed air to the blower suction switching mechanism (21) is cut off.

The above is the normal operation, but the oil in the fuel tank (29) was G oil (gasoline), but the oil filler port (28) was left open for a long time. Is diluted (Oil gas is heavier than air, so the fuel tank
(There is no fear that the oil and gas in (29) will be diluted)
The following description is based on the lean G gas detection curve in FIG. 4A.

When the discharge pipe (8) is inserted into the oil supply port (28) and the oil gas is sucked and the value of the detection signal s from the gas sensor (47) reaches the A level value (point h), the first determination circuit (58) ) Starts the time t ₂ hours, and the value of the detection signal s does not reach the B level value because the oil gas is diluted at the time t ₂ hours (point i), so the pump motor (16) However, oil is discharged from the nozzle (7) and the fuel tank (2
When the oil gas in 9) is agitated, a high concentration of oil gas rises to the filler port, and the gas sensor (47) detects the detection target component contained in this oil gas, so the value of the detection signal s is It becomes large and finally reaches the B level value within ₃ hours (j
point). Then, the second determination circuit (59) outputs the oil supply stop signal y to stop the pump motor (16) and simultaneously the buzzer (18).
The fact that it was G oil is notified via.

4B and 5B show a second embodiment of the first invention,
The difference from the first embodiment is that in the first embodiment the pump motor (16) is energized by the refueling permission signal x, whereas in the second embodiment the pump motor (16) is When the output signal of the nozzle detection switch (12) changes from the detection signal m to the non-detection signal n, the oil supply permission signal x is shown by the alternate long and short dash line in FIG. Solenoid valve (7
0) is input to the solenoid valve drive circuit (71), and the solenoid valve (70) is connected to the solenoid valve drive circuit (7) for the oil supply permission signal x.
It is opened by the input to 1) and closed by the detection signal m or the refueling stop signal y.

The solenoid valve (70) may be a solenoid valve (70) incorporated in a lubrication system that employs a preset lubrication system.

4C and 5C show a third embodiment of the first invention,
The difference from the first and second embodiments is that the first and second embodiments start measuring time t ₃ hours immediately after t ₂ hours, while the third embodiment
In the embodiment, the oil supply is started, that is, the oil is discharged from the nozzle (7) and the flow meter (5) measures the oil, and then the oil is started with the pulse signal p output from the pulse transmitter (6). ) Is detected, and the second determination circuit (59) starts counting t ₃ hours starting from this time.

By doing so, even if the oil is not discharged, that is, even if the pump (3) is rotating and the solenoid valve (70) is open, the lever (25) of the nozzle (7) is operated to discharge the oil. It is possible to solve the problem (it cannot be determined that the oil was G oil) when the time t ₃ has passed without being processed.

In the first, second, and third embodiments, the second judgment circuit (59) is set in the second judgment value setting circuit (59) as a set value for comparison with the value of the detection signal s. Although the B level value is used, it is also possible to newly provide a set value larger than the value of the detection signal s at the time of D oil gas detection and compare it with this.

Further, even when the functions of both circuits are provided by one circuit without forming the first determination circuit (58) and the second determination circuit (57) as separate circuits, they are included in the present application.

Next, the second invention will be described. The same parts and elements as those of the first invention are represented by the same reference numerals and the description thereof will be omitted.

In the second invention, the first determination circuit (58), the second determination circuit (59), and the second determination value setting circuit (5 in FIG. 5A, B, C of the first invention are provided.
7) is the first operation determination circuit (7
2), the second operation determination circuit (73), and the third determination value setting circuit (74).

The third judgment value setting circuit (74) has a detection signal s when the gas sensor (47) detects a component to be detected contained in the D oil gas.
The change rate (eg, α value) with respect to time and the change rate of the detection signal s when the detection target component gas included in the G oil gas is detected, for example, the ζ value, which is an intermediate change rate between the β value and It is set in advance and this value is output as a setting signal w '.

The first calculation determination circuit (72) compares the value of the setting signal u (A level value) output from the first determination value setting circuit (56) and the value of the detection signal s output from the gas sensor (47). In comparison, when the latter exceeds the former, the clock signal q output from the clock signal generation circuit (55) is started to be counted to start counting t ₂ hours, and by the end of t ₂ hours, the gas sensor (47)
Of the value of the detection signal s with respect to time and the ζ value preset in the third judgment value setting circuit (74) are compared, and the refueling permission signal is provided on the condition that the former value does not exceed the latter value. x (one pulse) is output, and at the same time, a determination start signal v (one pulse) is output.

The second operation determination circuit (73) receives the determination start signal v (the sixth operation described later).
In the embodiment counts the counted clock signal q t ₃ hours in the wake of the flow rate pulse signal p) is input, the rate of change and ζ for the time value of the detection signal s during the t ₃ hours the former is compared with the value (the value of the setting signal w ') is departure exceeds the latter and the fueling stop signal y (one-pulse), after t ₃ hours elapsed outputs a blower signal r _1.

In the above configuration, the second invention is shown in FIG.
A fourth embodiment will be described below with reference to FIGS. 3, 3A, B, 4A, and 6A. At the start of refueling, the nozzle (7) is removed from the nozzle case (13) and then the gas is temporarily removed. Sensor (47)
After the cleaning (ventilation) is performed, the operation until switching to suction and starting to detect the oil gas in the fuel tank (29) is the same as that of the first embodiment, so the description so far will be omitted. I will continue.

When the oil in the fuel tank (29) is D oil (light oil), the sensor output along the D oil gas detection curve (detection signal s)
Is obtained, and when the value of the detection signal s reaches the A level value (point c) which is the set value of the first judgment value setting circuit (56), the first operation judgment circuit (72) measures t ₂ hours. The change rate (α value at the point c) of the value of the detection signal s with respect to the time from the start to the time point t ₂ (point d) is the set value (setting signal w) of the third judgment value setting circuit (74). The refueling permission signal x is output on condition that the ζ value (value of ′) is not exceeded.

On the other hand, when the oil in the fuel tank (29) is G oil (gasoline), the value of the detection signal s reaches the A level value (point f) and is detected until t ₂ time elapses. Since the rate of change of the value of the signal s (β value at point f) exceeds the ζ value, the refueling permission signal is not output.

The pump motor (16) is urged by the output of the refueling permission signal x to be in a refuelable state, and when the lever (25) of the nozzle (7) is pulled, a built-in valve (not shown) opens to perform refueling. The calculation judgment circuit (58) outputs the judgment start signal v at the same time as the refueling permission signal x is output, so that the second calculation judgment circuit (73) measures the monitoring time t ₃ hours at the same time as the judgment start signal v is input. the start, (not exceed if D oil) the t ₃ hours if the rate of change with time of the value of the detection signal s during time measurement does not exceed the value of ζ value, that setting signal w 't ₃ hours elapsed The blower signal r ₁ is output afterward (point e), so that the solenoid valve (52) is energized to the state shown in FIG. 3B, and the ventilation passage (26) is switched from the suction state to the ventilation state and the ventilation passage (26) and the gas sensor (47) are cleaned in preparation for the next detection.

The subsequent operation, that is, the operation of returning the nozzle (7) to the nozzle case (13) and ending the oil supply, including the oil measurement and display accompanying the oil supply operation, is the same as that of the first embodiment, and therefore the description thereof is omitted.

Next, when the oil in the fuel tank (29) is G oil (gasoline) and the oil filler port (28) is left open for a long time, the oil gas near the fuel filler port is diluted ( Oil gas is heavier than air, so there is no possibility of dilution to oil gas in the fuel tank (29)), based on the lean G gas detection curve of FIG. 4A.

When the discharge pipe (8) is inserted into the oil supply port (28) to suck the oil gas and the value of the detection signal s from the gas sensor (47) reaches the A level value (point h), the first calculation determination circuit ( 72) is started counting of the t ₂ hours, the t ₂ hours elapsed time (i point) to the detection signal s time pump motor (16) with the bias because the rate of change does not reach to the ζ value for values However, when oil is discharged from the nozzle (7) and the oil gas in the fuel tank (29) is agitated, high-concentration oil gas rises to the oil filler port (28), and this oil gas Gas sensor to detect contained components
Since (47) detects, the value of the detection signal s becomes large.
Finally, the rate of change of the value of the detection signal s with respect to time becomes ε value during the lapse of t ₃ time and exceeds the ζ value (point j). Then, the second calculation determination circuit (73) outputs the oil supply stop signal y to stop the pump motor (16), and at the same time informs via the buzzer (18) that the oil is G oil.

FIG. 4B and FIG. 6B are the second and fifth in the second invention.
This embodiment is different from the fourth embodiment in that the pump motor (16) is energized by the refueling permission signal x in the fourth embodiment, whereas the fifth embodiment uses the pump motor (16). Motor (1
6) is energized when the output signal of the nozzle detection switch (12) changes from the detection signal m to the non-detection signal n, and the refueling permission signal x is shown by the alternate long and short dash line in FIG. ) Is input to the solenoid valve drive circuit (71), the solenoid valve (70) is opened by the input of the refueling permission signal x to the solenoid valve drive circuit (71), and the detection signal m is input. Alternatively, it is closed by the input of the refueling stop signal y.

The solenoid valve (70) may be the one built in the oil supply device adopting the preset oil supply system.

FIG. 4C and FIG. 6C are the third and sixth in the second invention.
In the embodiment of the present invention, the difference from the fourth and fifth embodiments is that, in the fourth and fifth embodiments, the time counting of t ₃ hours is started immediately after the lapse of t ₂ hours, whereas in the sixth embodiment, refueling is performed. The pulse signal p output from the pulse transmitter (6) is started, that is, oil is discharged from the nozzle (7) and the flow meter (5) measures it.
The start of refueling (start of refueling) is detected with, and the second calculation determination circuit (73) starts timing of t ₃ hours starting from this time.

By doing this, the oil will not be discharged, that is, even if the pump (3) is rotating and the solenoid valve (70) is open, the lever (25) of the nozzle (7) is operated and oil is discharged. It is possible to solve the problem (it cannot be determined that the oil was G oil) in the case where the time t ₃ has passed without any occurrence.

In the fourth, fifth, and sixth embodiments, ζ is set in the third determination value setting circuit as a set value for the second operation determination circuit to compare with the rate of change of the value of the detection signal s with time. Although the value is used, it is also possible to newly provide a set value larger than the rate of change of the value of the detection signal s at the time of D gas detection and compare it with this.

Further, even if the functions of both circuits are provided by one circuit without forming the first operation determination circuit (72) and the second operation determination circuit (73) as separate circuits, they are included in the present application. Further supply and suction switch mechanism (21) is carried out by other reversible pump forward rotation, generation of suction signal r ₁ is performed, r ₂ during normal rotation in that case may be by reversal of those according to the present embodiment When reversing, the air is blown.

(G) Effect By adopting the configuration described in detail above, in the oil supply device for D oil installed in the place where G oil containing a relatively large amount of the components to be detected by the gas sensor and D oil containing a relatively small amount of the components are handled, When the oil / gas near the oil filling port is diluted due to the oil filling port of the oil vehicle being left open for a long time, and it is mistakenly determined to be D oil and refueling is started. However, since the error is detected and the fuel supply is immediately stopped, it is possible to effectively prevent an accident such as engine malfunction due to a large amount of the wrong type of oil being supplied.

[Brief description of drawings]

FIG. 1 shows the internal structure of the oil supply device, FIGS. 2A and 2B show different operating states of the air valve mechanism, and FIGS. 3A and 3B show different operating states of the blower suction switching mechanism including the solenoid valve. FIG. 4A shows the sensor output and the operation timing of each part according to the first and fourth embodiments, and FIG. 4B shows the sensor output and the operation timing of each part according to the second and fifth embodiments.
FIG. 4C shows the sensor output and the timing of the operation of each part based on the third and sixth embodiments. FIG. 5A shows the electric circuit of the first embodiment, and FIG. 5B shows the electric circuit of the second embodiment. FIG. 5C shows the electric circuit of the third embodiment, FIG. 6A shows the electric circuit of the fourth embodiment, and FIG. 6B shows the electric circuit of the fifth embodiment.
The drawing shows the electric circuit of the sixth embodiment in blocks. 3 ... Pump, 5 ... Flow meter, 7 ... Refueling nozzle, 13 ...
… Nozzle case, 19… Air valve mechanism, 21… Blower suction switching mechanism, 22… Air supply pipe, 26… Ventilation path, 28… Oil filler,
29 …… Fuel tank, 31 …… Cylinder chamber, 33 …… Piston valve, 42 …… Nozzle, 43 …… Atmosphere opening passage, 44 …… Negative pressure generating chamber, 46 …… Bypass passage, 47 …… Gas sensor, 49 …… Valve disc, 52 …… Solenoid valve (for air), 70 …… Solenoid valve (for oil)

Claims (8)

[Claims] 1. 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. A ventilation passage, one end of which extends to the vicinity of the discharge pipe of the fuel nozzle and the other end of which is connected to the air blowing / suction switching mechanism, and the air blowing / suction switching mechanism contacts the gas sucked through this ventilation passage during the suction operation. And a gas sensor that detects the concentration of the detection target component gas generated from oil and generates a signal of a corresponding output value, and G oil that generates a high concentration detection target component gas and low Concentration detection target D Generated component gas D installed in a place that handles oil
An apparatus for supplying oil, the output value of a gas sensor when detecting a detection target component gas contained in the D oil gas, and the output of a gas sensor when detecting a detection target component gas contained in the G oil gas A B level value intermediate between the values and a second judgment value setting circuit that outputs this B level value and the output value of the gas sensor and the B level value during a preset monitoring time after the start of oil feeding And a second determination circuit that outputs a refueling stop signal when the former exceeds the latter, and a refueling device with an oil type sensor. 2. The oil supply device with an oil type sensor according to claim 1, wherein the oil supply start is a drive start of an oil supply pump. 3. The oil supply apparatus with an oil type sensor according to claim 1, wherein the start of oil supply means opening of a valve installed in the oil flow path. 4. The oil supply device with an oil type sensor according to claim 1, wherein the start of oil supply is the start of measurement of a flow meter. 5. An oil feeding 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. One end is extended to the vicinity of the discharge pipe of the fueling nozzle, the other end is connected to the ventilation / suction switching mechanism, and the ventilation / suction switching mechanism is used for the gas sucked through this ventilation path during suction operation. A G sensor that is installed at a contact position, detects the concentration of a detection target component gas generated from oil, and generates a signal of a corresponding output value, and G oil that generates a high concentration detection target component gas; A device for supplying D oil, which is installed in a place where D oil that generates a low-concentration detection target component gas is handled, and which is an output value of a gas sensor when the detection target component gas included in the D oil gas is detected. Change over time And a change rate ζ intermediate between the change rate of the output value of the gas sensor when the detection target component gas included in the G oil gas is detected is set, and the value of the change rate ζ is output. (3) The rate of change of the output value of the gas sensor with respect to time is compared with the rate of change ζ during the monitoring time set in advance by the judgment value setting circuit and the start of oil feeding, and when the former exceeds the latter, a refueling stop signal is output. An oil supply device with an oil type sensor, which comprises a second calculation determination circuit. 6. The oil supply device with an oil type sensor according to claim 5, wherein the start of oil supply is the start of driving of an oil supply pump. 7. The oil supply apparatus with an oil type sensor according to claim 5, wherein the start of oil supply means opening of a valve installed in the oil flow path. 8. The oil supply device with an oil type sensor according to claim 5, wherein the start of oil feeding is the start of metering of a flow meter.