JPH0637238B2 - 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.

As a result, there are frequent accidents in which light oil is supplied to gasoline vehicles or gasoline is supplied to light oil vehicles.In either case, oil must be drained from the fuel tanks and oil passages of automobiles, resulting in a large expense. Or need time and effort.

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 with positive and negative electrodes is immersed in oil, and the latter is to place the light emitting part and the light receiving part facing each other. This is determined by the intensity of light received by the light receiving section when liquid is present.

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 jumps out of the nozzle only at the time of detection, which complicates the drive mechanism and occupies a large space. become worse.

Secondly, depending on the vehicle model, the pipe connecting the fuel filler 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.

(D) Configuration and Action for Solving Problems The present invention includes a gas sensor that is commonly contained in gasoline and light oil by measuring the concentration of a gas component having a concentration difference depending on the oil type. Proposes a device that determines whether or not the oil type matches the oil type of the fueling nozzle, and permits oiling if they match, and the common configuration among the configurations of the first, second, third, and fourth inventions is as follows. A pump for oil supply, a flow meter for measuring the oil pumped by this pump, and an oil flow path connected to the flow meter.The oil supply hose extended outside the housing, the oil supply nozzle at the tip of the oil supply hose, and the oil supply end at one end. Concentration of component gas to be detected generated from oil, which is installed at a position where it extends to the vicinity of the discharge pipe of the nozzle and has the other end connected to negative pressure generating means, and a position in contact with the gas sucked through this gas passage Detect the corresponding output value And a gas sensor for generating a signal, a high concentration of the detection target component gas is generated G
An oil supply device installed in a place where oil and D oil that generate a low-concentration detection target component gas are handled, and which is between the output value of the gas sensor when D oil gas is detected and the output value when it is not detected. The A level value is set, and in addition to this common configuration, the first invention sets the B level value intermediate between the output value of the gas sensor when G oil gas is detected and the output value of the gas sensor when D oil gas is detected. The determination means is provided for recognizing the presence of the D oil gas on condition that the output value of the gas sensor exceeds the A level value and does not exceed the B level value after a lapse of a predetermined fixed time. In addition to the common configuration described above, the configuration of the second invention is such that the rate of change of this output value with respect to time is calculated on condition that the output value of the gas sensor has reached the A level value, and the calculated value is preset. Change rate of D oil gas and G oil gas To be in the range not exceeding the S value between the rate of change in the condition is provided with a recognizing operation determining means of the presence of D oil and gas.

In addition to the common configuration, the third invention sets a B level value intermediate between the output value of the gas sensor when detecting G oil gas and the output value of the gas sensor when detecting D oil gas, and outputs the output of the gas sensor. The determination means is provided for recognizing the presence of G oil gas on condition that the value exceeds the A level value and exceeds the B level value within a predetermined fixed time period.
In addition to the common configuration described above, the configuration of the invention of FIG. 3 is such that the rate of change of the output value with respect to time is calculated on condition that the output value of the gas sensor has reached the A level value, and the calculated value is preset. The calculation determining means for recognizing the presence of the G oil gas is provided under the condition that the S value is in the range between the change rate of the D oil gas and the change rate of the G oil gas. When the output value exceeds the A level value, the determination operation of the D oil gas or the G oil gas is started, and the oil type is specified based on the output value of the gas sensor or its change rate.

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

In FIG. 1, H is a housing of an oil supply device, which is installed on an island I made of concrete.

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

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

N is an oil supply nozzle, which is provided with a discharge pipe NP at its tip and is connected to a flow meter F via a rotary pipe joint R, a hose L, and a connecting pipe M.

S is a nozzle detection switch, which moves the nozzle N to the nozzle case K.
The detection signal e is output when is locked, and the non-detection signal d is output when released.

Q is a reversible pump for sending air, which is a negative pressure generating means, and sucks air through the ventilation passage U and discharges it from the exhaust port QO during forward rotation, and reversely sucks air from the exhaust port QO during reverse rotation. Discharge to U.

W is a sensor block attached to the nozzle N, UP
Is a ventilation path extending from the sensor block W to the side of the discharge pipe NP, MP is a pump driving motor, MQ is a reversible rotatable air feeding motor that drives the reversible pump Q, C is a fuel supply amount indicator, Y Is a control unit accommodating an electric circuit to be described later, and E is a fuel tank of an automobile and is provided with a fuel filler EI.

In FIG. 2, Z is a value corresponding to the concentration detected by detecting the concentration of a combustible component or a gas of a specific component contained in the oil, for example, pentane (the content ratio of the combustible component and pentane in gasoline is higher than that in light oil). A gas sensor that generates an output signal f, which is formed in the block body (2) and is installed in the sensor chamber (4) that connects the ventilation passage U and the ventilation passage UP, and is fixed by pressing with the block cap (6). There is.

Reference numeral (8) is an air introduction hole for opening the sensor chamber (4) to the atmosphere, and the opening area is adjusted by a screw type valve (10).

The role of the air introduction hole (8) is to raise the oil level (12) while sucking the gas in the fuel tank E through the air passage UP, and to raise the air passage U.
Even if the tip opening (14) of P sinks in oil, the air is sucked from the air introduction hole (8) to limit the rise of oil in the ventilation path UP to the sensor chamber (4) as shown in FIG. It is to stop at a height h that does not reach. The sensor room
(4) End surfaces of the air passage U that face each other in a straight line in
The gas sensor Z is located at a position deviated from the axial line between the (16) and the end surface (18) of the ventilation path UP because it requires heating such as a semiconductor method or a catalytic combustion method as the type of the gas sensor Z. If the gas sensor Z is directly in the gas flow, the heat is taken away by this gas flow and the detection sensitivity is disturbed.
A part of the gas flow flowing in the turbulent state reaches the gas sensor Z.

The output signal f of the gas sensor Z is sent to the control unit Y via the signal line (20).

In FIG. 3, (22) is a counting circuit, which is a flow rate pulse signal p.
Is counted, and the count value is output to the oil supply amount display C as a count value signal i to be displayed as the oil supply amount.

(24) is the judgment value setting circuit A, in which the value of the output signal f of the gas sensor Z in FIG. 5 is the value when D oil (light oil) gas is detected and the value when no gas is detected at all. An intermediate value between the two, that is, an A level value is set, and this A level value is output as a signal r.

Further, (26) is the judgment value setting circuit B, and the value of the output signal f of the gas sensor Z in FIG. 5 is also G oil (gasoline).
An intermediate value between the value when gas is detected and the value when D oil gas is detected, that is, a B level value is set, and this B level value is output as a signal l.

(28) is a clock pulse generation circuit, which outputs a clock signal q.

(30) is a determination circuit, which is a fixed time based on the clock signal q under the condition that the value of the output signal f of the gas sensor Z reaches the value of the signal r, that is, the value of A level (for example, t ₁ time (for example, (1 second) and the value of the signal f after the lapse of t ₁ hour has not reached the B level value, that is, it is determined to be D oil gas, and a refueling permission signal (hereinafter referred to as a determination signal) k
Outputs (one pulse).

(32) is a pump motor drive circuit for controlling the pump motor MP, which outputs a drive signal m on condition that the determination signal k is input to energize the pump motor MP,
On the condition that the output signal from the nozzle detection switch S changes from the non-detection signal d to the detection signal e, the output of the drive signal m is stopped to deactivate the pump motor MP.

(34) is a timer circuit, provided that the output signal of the nozzle detection switch S changes from the non-detection signal d to the detection signal e, that is, the nozzle N is returned to the nozzle case K. The signal u is output for t ₂ hours (for example, 10 seconds).

(36) is an air supply motor drive circuit for controlling the air supply motor MQ, in which the output signal of the nozzle detection switch S changes from the detection signal e to the non-detection signal d, that is, the nozzle N is removed from the nozzle case K. On the condition that the above condition is satisfied, the forward rotation signal n is output and the reversible pump Q is rotated in the forward direction so that the air supply motor M is rotated.
When Q is energized and the signal u is input, the reverse signal v is output instead of the normal signal n while the signal u is input, the reversible pump Q is driven in reverse, and the signal u disappears. The output of the reverse rotation signal v is stopped to deactivate the air supply motor MQ.

The first invention in the oil supply device for supplying D oil will be described based on the above configuration.

First, when the nozzle N is removed from the nozzle case K, the output signal of the nozzle detection switch S changes from the detection signal e to the non-detection signal d, whereby the previous count value of the counting circuit (22) is reset to zero and the count value signal is output. When the value of i becomes zero, the air supply motor drive circuit (36) outputs a normal rotation signal n to bias the air supply motor MQ in the normal direction, so that the reversible pump rotates in the normal direction and the air passages U, UP. The air inside is sucked and discharged from the exhaust port QO.

When the discharge pipe NP is inserted into the oil supply port EI, the oil gas in the fuel tank E is sucked from the tip end opening portion (14) of the ventilation path UP and reaches the gas sensor Z.

Then, when the value of the output signal f of the gas sensor Z rises and reaches the value of the signal r, that is, the value at the level of FIG.
(30) measures t ₁ hours based on the clock signal q, and this t ₁
On condition that the value of the signal f does not exceed the value of the signal l, that is, the value of the B level when the time has elapsed, that is, it is confirmed that the oil is D oil gas, the determination signal k is output, and the control circuit for the pump motor ( 36) Then, the pump motor MP is driven to drive the pump P so that oil can be supplied.

Here, when the oil in the fuel tank E is G oil,
For increasing the value of the output signal f of the gas sensor Z is rapid compared with the case was D oil, after t ₁ hours from the greater than the value of A level B as seen in FIG. 5 Since the level value is exceeded, it is judged that the oil is not D oil gas, and the judgment circuit (30) does not output the judgment signal k even after the lapse of t ₁ time. Will continue.

When refueling is performed, a pulse signal p of a number corresponding to the refueling amount is output from the pulse transmitter J, and the counting circuit (22) counts this and gives the count value to the refueling amount display C as a count value signal i. , Display the amount of refueling.

When the nozzle N is returned to the nozzle case K after refueling, the output signal of the nozzle detection switch S changes from the non-detection signal d to the detection signal e.
The pump motor drive circuit (3
The signal m issued from 2) disappears and the pump P stops.

At the same time, the timer circuit (34) starts measuring time t ₂ and outputs the signal u to the air supply motor drive circuit (36). Therefore, the output signal of the air supply motor drive circuit (36) is the forward rotation signal n. Changes to the reversing signal v, and the reversible pump Q is the exhaust port QO.
Air is sucked in from and is discharged from the tip end opening (14) through the air passage U, the sensor chamber (4) and the air passage UP. At this time, the gas sensor Z is cleaned by the gas-free air passing through the sensor chamber (4), and the value of the output signal f decreases to the value at the time of non-detection.
Even if there is oil on (14), blow it off to eliminate the effect on the next measurement.

When the time t ₂ has elapsed, the signal u disappears, the reverse signal v also disappears, the reversible pump Q is deenergized, and the next visitor is waited for.

Next, using the above description, the third invention will be described by exemplifying only the differences from the first invention. In the case of a G oil device, the value of the output signal f of the gas sensor Z is A If the B level value is exceeded before the time t ₁ elapses after the level value is exceeded, it is determined that G oil gas is present, and the determination circuit (30) outputs a determination signal k to refuel. But allow
If the B level value is still not exceeded even after the lapse of t ₁ hour, it is judged that the G oil gas does not exist and the refueling is not permitted.

That is, according to the first and third inventions, the device for D oil recognizes the presence of the D oil gas on the condition that the value of the output signal f of the gas sensor Z does not exceed the value of the B level after the lapse of t ₁ hour. The G oil device recognizes the presence of G oil gas on the condition that the value of the output signal f exceeds the value of the B level by the time t ₁ elapses.

Next, the second invention will be described based on FIGS. 1, 2, 4, 5, and 6, but the same components as those of the first invention will be denoted by the same reference numerals, and the description thereof will be omitted.

In FIG. 4, reference numeral (40) denotes a judgment value setting circuit C, which is a relation between the signal f and the time starting from the time when the value of the output signal f of the gas sensor Z of FIG. A δ value, which is an intermediate value between the α value that is the change rate of the detection curve and the slope value and the β value that is the change rate of the G oil detection curve and the slope value, is set. It is output as a signal x.

(42) is a calculation determination circuit, which is based on the relationship between the change in the value of the signal f and the time based on the clock signal q, starting from the time when the value of the output signal f of the gas sensor Z reaches the value of the A level. A slope that is the rate of change of the signal f is calculated, and if the calculated value is smaller than the δ value that is the value of the signal x, it is determined to be D oil gas and a determination signal k (one pulse) is output.

The second invention in the oil supply device for supplying D oil will be further described based on the above configuration.

First, when the nozzle N is removed from the nozzle case K, the output signal of the nozzle detection switch S changes from the detection signal e to the non-detection signal d, whereby the previous count value of the counting circuit is reduced to zero and the value of the count value signal i. When the air supply motor driving circuit (36) outputs a normal rotation signal n to urge the air supply motor MQ to rotate normally, the reversible pump rotates in the normal direction and the air in the air passages U and UP increases. Is sucked and discharged from the exhaust port QO.

When the discharge pipe NP is inserted into the oil supply port EI, the oil gas in the fuel tank E is sucked from the tip end opening portion (14) of the ventilation path UP and reaches the gas sensor Z.

Then, when the value of the output signal f of the gas sensor Z rises and reaches the value of the signal r, that is, the value of the level A in FIG. 5, the calculation judgment circuit (42) determines the output signal of the gas sensor Z based on the clock signal q. Change in value of f with time, that is, output signal f
Is calculated, and if the calculated value is smaller than the δ value (if the inclination is gentle), it is confirmed that the oil is D oil gas, and the determination signal k is output to output the pump motor control circuit (3
6), and the pump motor MP is driven to drive the pump P so that oil can be supplied.

Here, when the oil in the fuel tank E is G oil, the change value with time of the value of the output signal f of the gas sensor Z, that is, the slope is steeper (larger) than when it is D oil. Therefore, the value exceeds the δ value, and in this case, it is determined that the oil is not D oil gas, and the calculation determination circuit (42) does not output the determination signal k, so that the pump P is not driven and the oil supply state cannot continue. become.

When refueling is performed, a pulse signal p of a number corresponding to the refueling amount is output from the pulse transmitter J, and the counting circuit (22) counts this and gives the count value to the refueling amount display C as a count value signal i. , Display the amount of refueling.

When the nozzle N is returned to the nozzle case K after refueling, the output signal of the nozzle detection switch S changes from the non-detection signal d to the detection signal e.
The pump motor drive circuit (3
The signal m output from 2) disappears and the pump P stops.

At the same time, the timer circuit (34) starts counting the time t ₂ and outputs the signal u to the air supply motor drive circuit (36), so that the output signal of the air supply motor drive circuit (36) is the forward rotation signal n.
To the reversal signal v, the reversible pump Q sucks in air from the exhaust port QO and discharges it from the tip opening (14) through the ventilation passage U, the sensor chamber (4) and the ventilation passage UP. At this time,
The gas sensor Z is cleaned by the gas-free air passing through the sensor chamber (4), and the value of the output signal f decreases to the value at the time of non-detection, and the tip portion (14) of the ventilation path UP.
Even if oil is attached to it, it will be blown away and the effect on the next measurement will be eliminated.

When the time t ₂ has elapsed, the signal u disappears, the reversal signal v also disappears, the reversible pump Q is deenergized, and the next customer is waited.

Next, using the above description, the fourth invention will be described with reference to the differences from the second invention. In the case of a G oil device, the value of the output signal f of the gas sensor Z is A level. When the change (slope) after exceeding the value of is larger than the S value (steep), it is judged that the G oil gas is present, and the calculation judgment circuit (42) outputs the judgment signal k to refuel. But allow
If it is smaller (gradual) than the S value, it is determined that G oil gas does not exist and refueling is not permitted.

That is, according to the second and fourth inventions, the signal f
The presence of the D oil gas is recognized on the condition that the change is smaller than the S value, and the G oil device recognizes the presence of the G oil gas on the condition that the change is larger than the S value.

In the first, second, third, and fourth inventions, the sensor block W can be attached not to the nozzle N but to the exhaust port QO of the reversible pump Q as shown by the chain double-dashed line in FIG. However, since it takes time for the gas to reach the gas sensor Z, the response speed becomes slower, but there is an advantage that the nozzle is easy to handle because only the ventilation path U passes through the nozzle N.

It is also possible to notify by sound or light when G oil gas is detected, if necessary.

Further, the timing of starting the cleaning of the gas sensor Z is not the output timing of the detection signal e from the nozzle detection switch S, but the timing when the determination circuits (30) and (42) output the determination signal k, and the detection signal e It may be ended t ₂ hours after the input.

(F) Effect Because it is configured as detailed above, it is not necessary to insert the sensor deeply into the fuel tank until the sensor itself is submerged in oil, so a complicated mechanism for feeding the sensor is not required,
Therefore, the operability of the nozzle is not impaired, and it is possible to distinguish the oil type even if the pipe connecting the fuel filling port and the fuel tank is extremely bent, and it is possible to distinguish the oil type based on the output value of the gas sensor. Since the start timing is set, it is possible to obtain a refueling device that enables quick determination.

[Brief description of drawings]

FIG. 1 is a diagram showing the entire structure of the fuel supply apparatus, FIG. 2 is a diagram showing the structure of a sensor block, FIG. 3 is the electric circuit in the first and third inventions, and FIG. 4 is the second and fourth inventions. FIG. 5 is a diagram showing a gas detection curve, and FIG. 6 is a diagram showing timings of forward rotation and reverse rotation of the air feeding motor. P ... Pump, Q ... Reversible pump W ... Sensor block, Z ... Gas sensor U, UP ... Ventilation passage, EI ... Oil supply port (4) ... Sensor chamber, (8) ... Atmosphere introduction hole (10) …… Valve

Claims (4)

[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, It is installed at a position where 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 generating means, and a position in contact with the gas sucked through this ventilation path, and detection generated from oil A G sensor that detects a concentration of a target component gas and generates a signal of a corresponding output value, G oil that generates a high concentration detection target component gas, and a D oil that generates a low concentration detection target component gas Which is installed in a place where the oil is handled, the A level value intermediate between the output value of the gas sensor when D oil gas is detected and the output value when not detected, and the output of the gas sensor when G oil gas is detected Value and D
Set the B level value that is the middle of the output value of the gas sensor at the time of oil gas detection, and make sure that the B level value does not exceed the B level value after a predetermined time elapses after the output value of the gas sensor exceeds the A level value. An oil supply device with an oil type sensor, characterized in that a determination means for recognizing the presence of D oil gas is provided. 2. 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. It is installed at a position where 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 generating means, and a position in contact with the gas sucked through this ventilation path, and detection generated from oil A G sensor that detects a concentration of a target component gas and generates a signal of a corresponding output value, G oil that generates a high concentration detection target component gas, and a D oil that generates a low concentration detection target component gas A gas refueling device installed in a place where a G oil gas is present, by setting an A level value intermediate between the output value of the gas sensor when D oil gas is detected and the output value when it is not detected. Of the output value of The S value, which is a change rate intermediate between the change rate and the same change rate when D oil gas is present, is set, and the change rate of this output value with respect to time is set on condition that the output value of the gas sensor has reached the A level value. An oil supply device with an oil type sensor, comprising an operation determination means for performing operation and recognizing the presence of D oil gas on condition that the operation value does not exceed the S value. 3. 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. It is installed at a position where 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 generating means, and a position in contact with the gas sucked through this ventilation path, and detection generated from oil A G sensor that detects a concentration of a target component gas and generates a signal of a corresponding output value, G oil that generates a high concentration detection target component gas, and a D oil that generates a low concentration detection target component gas Which is installed in a place where the oil is handled, the A level value intermediate between the output value of the gas sensor when D oil gas is detected and the output value when not detected, and the output of the gas sensor when G oil gas is detected Value and D
Set a B level value that is the middle of the output value of the gas sensor at the time of oil gas detection, and exceed the B level value within a predetermined fixed time after the output value of the gas sensor exceeds the A level value. An oil supply device with an oil type sensor, characterized in that a determination means for recognizing the presence of G oil gas is provided under the condition. 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. It is installed at a position where 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 generating means, and a position in contact with the gas sucked through this ventilation path, and detection generated from oil A G sensor that detects a concentration of a target component gas and generates a signal of a corresponding output value, G oil that generates a high concentration detection target component gas, and a D oil that generates a low concentration detection target component gas A gas refueling device installed in a place where a G oil gas is present, by setting an A level value intermediate between the output value of the gas sensor when D oil gas is detected and the output value when it is not detected. Of the output value of The S value, which is a change rate intermediate between the change rate and the same change rate when D oil gas is present, is set, and the change rate of this output value with respect to time is set on condition that the output value of the gas sensor has reached the A level value. An oil supply device with an oil type sensor, which is provided with an operation determination means for performing operation and recognizing the presence of G oil gas on condition that the operation value exceeds the S value.