JPH11208796A - Oil feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow correct determination of an oil type corresponding to a temperature status of oil vapor concentration remaining in a fuel tank to which oil is fed. SOLUTION: In the oil feeder, when an injection pipe 8A of an oil feed nozzle 8 is inserted into an oil inlet port of a fuel tank, oil vapor in the fuel tank is sucked by an intake pump 15 from the injection pipe 8A. The sucked oil vapor is supplied through a suction hose 13 to an oil vapor concentration sensor 17. A control circuit 25 calculates a temperature rise in a heater and a resistance value based on a current value and a voltage value to the heater for heating the oil vapor concentration sensor 17 and calculates a heater temperature from a change in the resistance value. It also changes a magnitude of an oil type determination value (threshold) based on temperature calculated by a temperature measurement program 25A. The control circuit 25 determines the oil type from a detection value from comparison of the oil vapor concentration sensor 17 with the threshold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fueling apparatus, and more particularly to a fueling apparatus configured to suction oil vapor remaining in a fuel tank before fueling the fuel tank and to determine an oil type from an oil vapor concentration. .

[0002]

2. Description of the Related Art In a gas station, for gasoline supply,
An oil supply device is provided for each type of oil supply, such as for light oil supply. Therefore, with this type of refueling system, when refueling a fuel tank or the like of a customer's car, for example, a different type of refueling accident such as accidentally refueling a gasoline supply location using a light oil supply refueling system In order to prevent this, an oil type determination function tends to be provided. And
The refueling device equipped with this oil type determination function pays attention to the fact that the saturated vapor pressure (steam concentration) differs between gasoline and light oil,
Before refueling, the vapor (oil vapor) of the residual oil liquid in the fuel tank is applied to an oil vapor concentration sensor of the oil type determination device to detect the oil vapor concentration, and based on the detection result, the oil of the residual oil liquid in the fuel tank is detected. The type is determined, and only when the oil type of the remaining oil in the fuel tank matches the oil type of the oil supplied from the oil supply device,
Refueling is made possible.

[0003] As the oil vapor concentration sensor, for example, a semiconductor gas sensor for detecting the oil vapor concentration of vapor is used. In this oil vapor concentration sensor, the electrical characteristics change according to the oil vapor concentration, and thereby, it is possible to determine the difference in oil type. For example, an oil vapor concentration sensor composed of a semiconductor type gas sensor outputs a change in resistance value according to a difference in oil vapor concentration of gasoline, light oil, or the like as a change in output voltage.

Further, in a contact combustion type sensor of another method,
Applying a current to a coil made of a metal material
Self-heat to about 00 ° C. When the oil vapor reaches here, the oil vapor burns to further heat the coil and the like. Therefore, the contact combustion type sensor composed of the part heated by steam and the part not heated becomes an oil vapor concentration sensor utilizing the fact that the resistance balance is lost.

[0005]

However, the water in the air enters the fuel tank every time the fuel tank cap is removed at the time of refueling and dew forms on the inner wall of the tank. Dew condensation accumulates on the bottom. Therefore, the fuel in the fuel tank may be mixed with an additive such as a drainage agent mainly composed of alcohol to remove the water in the fuel tank.

[0006] When such a drainage agent is added to light oil, the vapor concentration of alcohol contained in the drainage agent is high, so that the vapor concentration becomes higher than in the case of light oil alone. And the difference in the vapor concentration becomes smaller. In addition, the vapor concentration in the fuel tank of an automobile changes depending on the temperature in the tank, and when the temperature in the tank is high, alcohol contained in the fuel and highly volatile oil components become steam,
As a whole, the vapor concentration in the fuel tank increases.
Therefore, the temperature in the tank changes according to the surrounding environmental conditions, and changes depending on, for example, the air temperature, the running condition before coming to the gas station, whether the parking place is exposed to direct sunlight, and the like.

[0007] Therefore, in a conventional oil supply device having an oil type determination function, when the temperature type is not corrected when detecting the oil type in the fuel tank in which the drainage agent is mixed, the vapor concentration of the fuel tank becomes lower than that of gasoline. When the vapor concentration approaches, for example, the temperature of the fuel tank is increased due to the surrounding environment, the vapor concentration in the fuel tank supplied to the oil vapor concentration sensor approaches the vapor concentration of gasoline, for example, the light oil containing the drainage agent. Despite the fact that the fuel nozzle is inserted into the fuel tank, the oil type of the fuel tank may be determined to be gasoline, and the oil type determination result is not accurate.

There is also a method in which a temperature sensor is provided at a fueling nozzle to measure the temperature of oil vapor in a fuel tank in which the fueling nozzle is inserted, and the threshold value is changed according to the temperature. In this case, since the temperature of the steam does not correspond to the temperature of the oil type sensor, there is also a problem that the steam concentration cannot be converted and the oil type cannot be accurately determined. A method of changing the valve opening degree according to the outside air temperature and changing the ratio of the flow rate from the oil vapor suction system to the air introduction system to make the oil vapor concentration constant has been considered. There is a problem that the mechanism is complicated and heavy, and there is also a problem that it does not correspond to the temperature in the fuel tank because the temperature detection position is the air inlet.

It is also conceivable to provide a temperature sensor in the oil vapor suction system passage. However, when the oil vapor comes into contact with a portion having a temperature difference, dew condensation occurs. It was difficult to remove by the time of detection. For this reason, there was a case where the oil type judgment was erroneous due to the influence of the previous oil type attached to the temperature sensor during the next oil type detection.

Accordingly, an object of the present invention is to provide an oil supply device which realizes the temperature characteristics of oil vapor pressure in oil type determination without using a temperature sensor in order to solve the above-mentioned problem.

[0011]

The present invention has the following features to solve the above-mentioned problems. Claim 1
According to the invention described above, oil vapor in a fuel tank is supplied to an oil vapor concentration sensor via a suction system path opened on the tip side of a refueling nozzle, and a detection value output from the oil vapor concentration sensor and refueling from the refueling nozzle are performed. The oil temperature is determined by comparing an oil type determination value corresponding to the predetermined oil type with a control means for permitting or prohibiting the supply of the oil liquid to the oil supply nozzle. Temperature measurement means for measuring from a current voltage flowing through the oil vapor concentration sensor, and oil type determination value setting means for changing the oil type determination value based on the temperature measured by the temperature measurement means. It is a feature.

Therefore, according to the first aspect of the present invention, the temperature of the environment of the oil vapor concentration sensor is measured from the current and voltage applied to the oil vapor concentration sensor, and the oil type determination is performed based on the measured temperature. Since the value is changed, it is possible to detect the temperature of the oil vapor sucked for the oil type determination without using a temperature sensor, and the oil type can be determined according to the temperature condition. The type determination accuracy can be improved, and the reliability of the oil type determination can be increased.

According to a second aspect of the present invention, in the oil supply device according to the first aspect, the temperature measuring means sets a voltage applied to a heater of the oil vapor concentration sensor to a constant value based on a current value flowing through the heater. Temperature conversion means for obtaining a temperature rise value and a resistance value; and temperature calculation means for obtaining an environmental temperature of the oil vapor concentration sensor from the temperature rise value and the resistance value output by the temperature conversion means. It is a feature.

Therefore, according to the second aspect of the present invention, the temperature measuring means determines the temperature rise value and the resistance value from the current value flowing through the heater while keeping the voltage applied to the heater of the oil vapor concentration sensor constant. To determine the ambient temperature of the oil vapor concentration sensor from the resistance value and the resistance value, it is possible to detect the temperature of the oil vapor sucked for oil type determination with a relatively simple configuration without using a temperature sensor, Since the oil type determination according to the temperature condition is possible, the accuracy of the oil type determination can be further improved and the reliability of the oil type determination can be improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a schematic configuration of an embodiment of a fuel supply device according to the present invention. As shown in FIG. 1, reference numeral 1 denotes a fixed-type weighing machine provided in a gas station site, and 2 denotes a pipe provided in the weighing machine 1. A driven pump 4 and a flow meter 5 for measuring an amount of refueling are provided. The flow meter 5 is provided with a flow pulse transmitter 6 for transmitting a flow pulse proportional to the flow rate.

Reference numeral 7 denotes a refueling hose having a base end connected to the pipe 2, and reference numeral 8 denotes a refueling nozzle provided at a distal end of the refueling hose 7. When the nozzle lever is opened, the main valve (not shown) provided inside the fuel supply nozzle 8 opens to discharge the oil liquid from the discharge pipe 8A to the fuel tank. Reference numeral 9 denotes a nozzle hook provided on a side surface of the weighing machine 1, and is a portion where the fueling nozzle 8 is detached. The nozzle hook 9 is provided with a nozzle switch 10 that is turned on and off in conjunction with the removal of the oil supply nozzle 8. Therefore,
When the refueling nozzle 8 is removed from the nozzle hook 9, the nozzle switch 10 is turned on and outputs a refueling operation signal indicating that the refueling operation is being performed to the control circuit 25 described later.

The refueling nozzle 8 has a nozzle insertion sensor 11 attached to the tip of the discharge pipe 8A. The nozzle insertion sensor 11 includes, for example, an optical sensor and the like. When the discharge pipe 8A is inserted into a fuel supply port (not shown) of the fuel tank, the light receiving level falls below a predetermined value and the nozzle insertion detection signal is controlled. Output to the circuit 25. 13 is a refueling hose 7
Is a suction hose as an oil vapor suction pipe provided along the line, one end of which extends to the tip of the discharge pipe 8A of the oil supply nozzle 8, and is opened at the tip of the discharge pipe 8A.
It has become. The other end of the suction hose 13 extends into the weighing machine 1 and is connected to an electromagnetic three-way valve 14. The electromagnetic three-way valve 14 branches into an intake hose 13B and an exhaust hose 13C. Further, the ends of the intake hose 13B and the exhaust hose 13C open to the atmosphere via an intake pump 15 and an exhaust pump 16, which will be described later.

When the discharge pipe 8A of the fuel supply nozzle 8 is inserted into the fuel supply port of the fuel tank, oil vapor in the fuel tank is sucked from the discharge pipe 8A by the suction pump 15. In that case, the oil vapor in the fuel tank passes through the discharge pipe 8A and is supplied into the nozzle body 8B. Therefore, the sucked oil vapor passes through the suction hose 13 and passes through the suction pump 1.
It is sucked to the 5 side.

Reference numeral 17 denotes an oil vapor concentration sensor which is disposed downstream of the suction hose 13 and detects an oil type of the oil vapor supplied from the suction hose 13, and detects an oil vapor concentration of the oil type stored in the fuel tank. The corresponding oil type detection signal is output. Also,
Oil vapor concentration sensor 17 is generally in a gas sensor for combustible gas, for example, from sintered semiconductor sensor added with palladium or the like as an additive in the tin oxide, gasoline, C _n H _{2n + 2} system saturation of such gas oil, etc. Hydrocarbons (gasoline; n
= 4 to 12, and light oil n = 15 to 20).

Therefore, the output voltage of the oil vapor concentration sensor 17 changes according to the oil type of the oil vapor supplied from the suction hose 13, and outputs an oil type detection signal of a voltage corresponding to the oil vapor concentration to the control circuit 25. . That is, the resistance value of the oil vapor concentration sensor 17 is gasoline, gas oil, alcohol gas (methyl alcohol; CH ₃ OH, isopropyl alcohol; CH ₃
Regardless of the type of CH (OH) CH3 (with (OH) attached), it depends only on the gas concentration of hydrocarbons and has no gas selectivity.

Here, since the oil vapor concentration sensor 17 has a built-in electric heater (not shown), a circuit for detecting a current flowing through the heater and a voltage of the heater, and a voltage applied to the heater are provided. The current value and voltage value of the heater are input to the control circuit 25 via an A / D converter for A / D converting the value. As the oil vapor concentration sensor 17, for example, a semiconductor gas sensor for detecting the oil vapor concentration of vapor or a contact combustion type sensor is used. Since both the semiconductor gas sensor and the contact combustion sensor have a built-in heater, the temperature of the air or oil vapor introduced into the oil vapor concentration sensor 17 is calculated based on the current value and voltage value of the heater. be able to.

The suction pump 15 is provided in the middle of the suction hose 13B, sucks the air in the suction hose 13 and supplies the oil vapor in the fuel tank to the oil vapor concentration sensor 17.
The suction pump 15 includes a motor and a suction gas pump (both not shown) driven by the motor. When the motor is driven, air is introduced into the suction hose 13 so that oil Oil vapor in the fuel tank is sucked from the suction port 13A.

The exhaust pump 16 is provided in the middle of the exhaust hose 13C, supplies air into the suction hose 13 and retains the oil vapor and the oil vapor concentration sensor 1 remaining in the suction hose 13.
The oil vapor attached to 7 is exhausted from the oil vapor suction port 13A. The exhaust pump 16 is composed of a motor and an exhaust gas pump (both not shown) driven by the motor. When the motor is driven, air from the exhaust hose 13C is supplied to the suction hose 13. Introduce oil vapor suction port 13
The oil vapor in the fuel tank is discharged from A.

On the other hand, reference numeral 18 denotes a display provided on the front or back panel of the weighing machine 1, and a refueling amount display section 19 for displaying a refueling amount, an oil type determination result, an operation error at the time of an oil type determination operation, and the like. And an oil type determination state display section 20 for displaying.
Reference numeral 22 denotes a setting device provided on a side panel of the weighing machine 1, which has a setting key 23 and a setting display 24 for displaying setting contents by operating the setting key 23. The setting key 23 has a function of inputting the type of oil used for the weighing machine 1 to the control circuit 25 and a function of inputting a preset value at the time of preset refueling, a refueling unit price, and the like.

The control circuit 25 is composed of, for example, a microcomputer. The input side of the control circuit 25 is connected to the above-described flow rate pulse transmitter 6, nozzle switch 10, nozzle insertion sensor 11, oil vapor concentration sensor 17, setting device 22, and the like. The output side is connected to a pump motor 3, an intake pump 15, an exhaust pump 16, a display device 18, and the like. And
In the storage area (RAM or ROM) of the control circuit 25,
A temperature measurement program (temperature measurement program) that calculates a heater temperature rise and a resistance value based on a current value and a voltage value to a heater that heats an oil vapor concentration sensor 17 described later, and calculates a heater temperature from a change in the resistance value. Means) an oil type determination value (threshold) based on 25A, an oil type determination program 25B for performing an oil type determination by comparing a detection value from the oil vapor concentration sensor 17 with a threshold value, and a temperature calculated by the temperature measurement program 25A. An oil type determination value setting program (oil type determination value setting means) 25C for setting and changing the size of, and various comparison data values for executing each control program are stored.

Here, a calculation method by which the temperature measurement program 25A calculates the temperature will be described. When a voltage E is applied to a heater (not shown) for heating the oil vapor concentration sensor 17, the amount of heat generated by the heater is inversely proportional to the resistance value. The actual amount of heat P is obtained by the following equation (1).

P = E × E / R (1) Further, the heat transfer coefficient C becomes constant depending on the structure of the heater. Therefore, the temperature rise ΔT of the heater is proportional to the electric power P as in the following equation (2). P = C × ΔT (2) Since the powers are equal, a certain relationship exists between the temperature rise ΔT, the resistance value R, and the voltage E. That is, the following relationship (3) is established.

ΔT × R = E × E / C (3) Here, assuming that the applied voltage E and the heat transfer coefficient C are constant, the temperature rise ΔT and the resistance value R are inversely proportional. In order to measure the resistance value R, the current value I flowing through the heater may be obtained. From this, the temperature rise ΔT and the resistance value R can be obtained based on the current value I and the voltage value E.

Further, since a heater having a configuration in which platinum is wound in a coil shape in consideration of durability and the like is used, the relationship between temperature and resistance can be calculated by a linear function. That is, the relationship between the temperature rise ΔT and the resistance value R can be expressed as the following equation (4). R = r × (1 + αT) (4) In (4), α is a temperature coefficient, and r is a certain temperature (0 °
C) is the resistance value. Accordingly, since the resistance value r at a certain temperature (0 ° C.) can be determined from the resistance value R, the temperature T can be obtained by calculation.

Here, the environmental temperature Ta is obtained by subtracting the temperature rise ΔT from the temperature T as in the following equation (5). Ta = T−ΔT (5) The value of the temperature Ta corresponds to the temperature of the oil vapor sucked from the fuel tank before refueling. That is, it is possible to calculate the temperature of the oil vapor from the resistance value of the heater for heating the oil vapor concentration sensor 17 without providing a temperature sensor in the oil supply nozzle 8 and measuring the temperature of the oil vapor sucked. Yes, the need for a temperature sensor is eliminated.

Therefore, in this embodiment, the temperature of the oil vapor can be obtained without using a temperature sensor as in the prior art.
The number of parts of the refueling nozzle 8 is reduced, the working efficiency in the assembling process is increased, and the manufacturing cost can be reduced. In general, gasoline and light oil are often handled as oil types at a gas station. Therefore, in the present embodiment, a case in which the oil type of gasoline and light oil is determined will be described as an example.

Gasoline and gas oil are the same hydrocarbon system,
Although the main component is a saturated hydrocarbon _{(C n H n + 2)} , the number of atoms, gasoline C ₄ -C _12, light oil C ₁₅ -C ₂₀
Is comprised of the components in the range. That is, light oil is composed of a component having a high boiling point (boiling point of 250 to 300 ° C), and gasoline is composed of a component having a low boiling point (boiling point of 30 to 150 ° C).
Therefore, the oil vapor concentration of light oil is low and the oil vapor concentration of gasoline is high.

On the other hand, additives such as a water draining agent are mainly composed of alcohol and have a boiling point of 65 ° C., which is almost the same as that of gasoline components. The gas concentration increases in the order of light oil, alcohol, and gasoline. FIG. 2A is a graph showing output characteristics of each oil type of the oil vapor concentration sensor 12, and FIG. 2B is a graph showing output characteristics output from a temperature detection program for calculating the temperature of oil vapor. It is. In FIG. 2A, the solid line shows the characteristics when the fuel tank temperature is at a normal temperature, and the broken line shows the characteristics when the fuel tank temperature is higher than the ambient temperature.

The resistance value of the oil vapor concentration sensor 17 changes according to the gas concentration of the sucked oil vapor, and the difference between the resistance values of gasoline and light oil is large due to the oil vapor concentration described above. Gasoline and light oil can be easily determined based on the magnitude of the output voltage. On the other hand, the oil vapor concentration sensor 17 has a resistance value between light oil and gasoline when detecting alcohol which is a main component of the drainage agent. And, for example, when parked in a place with strong sunlight in the summer, or when the temperature of the fuel tank changes greatly when parked in the shade, or when parked in an underground parking lot in the winter,
The temperature in the fuel tank also changes when parked in a snowfall location.

As described above, when the temperature in the fuel tank changes, the oil vapor concentration in the fuel tank also changes. Therefore, when the oil type of gasoline and light oil containing a drainage agent is determined by the oil vapor concentration sensor 17, the amount of oil vapor generated in the fuel tank increases due to the temperature rise, and the oil vapor becomes rich or the temperature decreases. It is necessary to consider that the amount of oil vapor generated in the fuel tank is small and the oil vapor is lean. In this case, the difference in gas concentration between the oil vapor of light oil mixed with a drainage agent mainly composed of alcohol and the dilute oil vapor of gasoline becomes small, and it is difficult to perform accurate oil type detection.

For this reason, in this embodiment, as shown in FIG. 2A, the oil type determination value (threshold) of the output voltage of the oil vapor concentration sensor 17 is set to the temperature measurement program 25 shown in FIG.
The optimum oil type determination value (threshold) corresponding to the temperature of the oil vapor is obtained by correcting based on the temperature of the oil vapor in the fuel tank calculated by A. By comparison, it is possible to accurately determine whether the oil type is gasoline or light oil containing a drainage agent.

Here, the oil type determination processing executed by the control circuit 25 in the oil supply device having the above configuration will be described with reference to the flowcharts of FIGS. still,
The refueling nozzle 8 of the refueling device is for gasoline refueling. In FIG. 3, the control circuit 25 determines in step S1
(Hereinafter, “step” is omitted), the nozzle switch 1
Checking if 0 has switched on,
When the worker at the gas station removes the fueling nozzle 8 from the nozzle hook 9, the nozzle switch 10 is turned on. When the nozzle switch 10 is turned on, the process proceeds to S2, and the suction hose 1 is turned on.
The electromagnetic three-way valve 14 is switched so that the third oil vapor suction port 13A and the suction hose 13B communicate with each other, and the suction pump 16 is started. Then, the timer is started (time measurement starts).

At this time, the discharge pipe 8A of the refueling nozzle 8 is not inserted into the fuel supply port of the fuel tank, and only air is sucked into the suction hose 13 from the oil vapor suction port 13A at the tip of the discharge pipe 8A. It is supplied to an oil vapor concentration sensor 17 via a hose 13. Therefore, in S3,
An electric current is supplied to a heater built in the oil vapor concentration sensor 17, and a temperature rise and a resistance value of the heater are calculated based on a current value and a voltage value to the heater. Atmospheric temperature T1 of the introduced air
(Temperature conversion means, ambient temperature measurement means). Therefore, the temperature of the sucked air can be obtained without using a temperature sensor as in the related art. Then, the atmospheric temperature T1 calculated by the temperature measurement program 25A is read.

Then, the program proceeds to S4, in which a threshold value (L1) for determining the type of oil according to the atmospheric temperature T1 is set. The atmospheric temperature T
The correlation between 1 and the threshold value (L1) has been obtained in advance by an experiment, and the threshold value (L1) can be easily obtained by the conversion function (F1).
1) can be calculated. The threshold (L1) here is a reference for setting a threshold (L2) described later. Here, when the worker inserts the discharge pipe 8A of the fueling nozzle 8 removed from the nozzle hook 9 into the fueling port of the fuel tank, the oil vapor in the fuel tank is sucked into the suction hose 13 from the discharge pipe 8A of the fueling nozzle 8. Is done. Therefore, the suctioned oil vapor is supplied to the oil vapor concentration sensor 17 via the suction hose 13. Then, the oil vapor concentration sensor 17 outputs an output voltage corresponding to the gas concentration of the oil vapor.

Further, in S5, when the discharge pipe 8A is inserted into the fuel filler and an insertion detection signal is output from the nozzle insertion sensor 11 provided at the tip of the discharge pipe 8A, the delay processing of S5a causes a delay after a predetermined time. (About 1 second) S
Proceed to 6. In step S6, a current is supplied to the heater incorporated in the oil vapor concentration sensor 17 in the same manner as in step S3, and the temperature rise and resistance of the heater are calculated based on the current value and voltage value to the heater. From the change in the value, the temperature of the oil vapor, that is, the temperature T2 of the oil vapor in the introduced fuel tank
(Temperature conversion means, ambient temperature measurement means).

Therefore, the temperature of the sucked oil vapor can be obtained without using a temperature sensor as in the related art. Then, the oil vapor temperature T2 calculated by the temperature measurement program 25A is read. Here, the delay processing of S5a waits for a fixed time sufficient for the oil vapor in the fuel tank sucked by the suction hose 13 to reach the oil vapor concentration sensor 17, and detects the oil vapor temperature T2 accurately. It is processing for.

In the next step S7, a threshold value (L2) for determining the oil type according to the oil vapor temperature is set based on the oil vapor temperature T2 calculated in S6. Incidentally, the oil vapor temperature T2 and the threshold value (L
The correlation with 2) is obtained in advance by an experiment as in the case of S4 described above, and the threshold value (L2) can be easily calculated by the conversion function (F2). In the present embodiment, the threshold value of the oil vapor concentration sensor has been described as being set to two of L1 and L2.
Since the calculation is performed in accordance with the temperature calculated by A, the threshold can be corrected steplessly.

Therefore, in S4, the threshold (L1) set based on the atmospheric temperature is set to the threshold (L2) corresponding to the oil vapor temperature. As described above, in this embodiment, the threshold value (L1) corresponding to the atmospheric temperature is corrected to the threshold value (L2) corresponding to the oil vapor temperature in a preset state, so that the accuracy is higher according to the actual environmental change. A threshold (L2) can be set.

Since the ambient temperature affects the temperature of the fuel tank, the ambient temperature and the oil vapor temperature are often close to each other. However, when the temperature in the fuel tank differs from the ambient temperature due to the above-described vehicle conditions. Therefore, the atmospheric temperature and the temperature of the fuel tank are not always equal. Therefore, the threshold value (L1) set based on the atmospheric temperature and the threshold value (L2) corresponding to the oil vapor temperature in the fuel tank may almost coincide with each other depending on the situation at that time, It often shifts depending on the environment.

In this embodiment, when the output value (D1) corresponding to the oil vapor concentration in the fuel tank is read from the oil vapor concentration sensor 17 in S8, the process proceeds to S9, where the threshold value (L2) and the oil vapor concentration sensor 17 are read. The oil type is determined by comparing the output value (D1). In the case of the present embodiment, as shown in FIG. 2, when D1> L2, it is determined that “gasoline”, and when D1 <L2, it is determined that “light oil”.

Subsequently, in S10, the above oil type determination result and the oil type of the oil liquid discharged from the oil supply nozzle 8 registered in advance in the memory (in this embodiment, the oil type of the oil liquid stored in the underground tank) Is determined to be “gasoline”) or not. Therefore, in S9, when the oil type determination result of the oil vapor from the fuel tank is “gasoline”,
In the case of the present embodiment, since the oil types match, the process proceeds to S11, and refueling permission is set. That is, in S11, the pump motor 3 is started, the pump 4 pumps up the oil liquid (here, gasoline) in the underground tank (not shown), and sends the oil liquid to the oil supply hose 13 and the oil supply nozzle 8. Thus, the fuel tank can be refueled. And FIG.
In step S12, the liquid crystal display 20 displays, for example, "gasoline refueling OK".

As described above, since the oil type is determined by comparing the oil vapor concentration with the threshold value (L2) corresponding to the oil vapor temperature, for example, the threshold value between the gasoline having a small oil vapor concentration difference and the light oil containing the additive is determined. (L2) can be set. Therefore, the lower limit of the oil vapor concentration of the gasoline and the upper limit of the oil vapor concentration of the light oil containing the additive can be determined with high accuracy, so that the gasoline and the light oil containing the additive can be accurately determined.

Therefore, even if the oil vapor concentration of the additive-containing light oil increases due to the temperature increase, the oil type having a small oil vapor concentration difference is set by setting the threshold (L2) according to the oil vapor temperature as described above. Can also be determined accurately. S1 above
After determining that the oil type of the fuel tank matches the oil type of the fuel supply nozzle 8 at 0 and the pump 4 is started, the process proceeds to S13 to end the oil type determination process, and the output of the intake signal to the intake pump 15 is performed. Stop.

In the next step S14, the exhaust pump 16 is started, and the electromagnetic three-way valve 14 is used to switch to the exhaust hose 13C side so that the oil vapor sucked into the suction hose 13 is exhausted from the oil vapor suction port 13A. Then, in S15, when the nozzle lever of the refueling nozzle 8 is opened to start refueling, a refueling measurement process is performed. That is, when the refueling nozzle 8 is opened, gasoline in an underground tank (not shown) is pumped by the pump 4 and sent to the fuel tank via the pipe 2, the refueling hose 7, and the refueling nozzle 8.

The refueling amount of the gasoline thus refueled is measured by the flow meter 5, and a flow pulse corresponding to the flow is output from the flow pulse transmitter 6 to the control circuit 25. And
The measured refueling amount is displayed on the refueling amount display 19. In the next S16, when a full tank sensor (not shown) provided at the end of the discharge pipe 8A is turned on, a signal from the full tank sensor is read as a liquid level detection signal for detecting the liquid level of the oil liquid in the fuel tank. .

In the next step S17, it is determined whether or not the tank is full based on the presence or absence of the liquid level detection signal. When it is determined in S17 that the fuel tank is full, the level of the oil liquid in the fuel tank has risen to the vicinity of the fuel filler, and the fuel nozzle 8
Is in contact with the oil surface. Therefore, the process proceeds to S18, in which the output of the pump drive signal is stopped, and the pump motor 3 is stopped. Then, the operator confirms that the pump 7 is full due to the stoppage of the pump 7, removes the fueling nozzle 8 of the fuel tank from the fueling port and puts it on the nozzle hook 9 in order to end the fueling work. Further, in S20, it is checked whether or not the nozzle switch 10 is turned off. When the nozzle switch 10 is turned off, it is determined that the refueling nozzle 8 is returned to the nozzle hook 9 and the refueling operation is completed. .

In S20, the operation of the exhaust pump 16 already driven in S14 is further continued in a state where the oil vapor suction port 13A is not exposed to the oil vapor (a state in which the oil supply nozzle 8 is hung on the nozzle hook 9). In order, intake hose 13
Start the exhaust timer to completely discharge the oil vapor in the tank. If there is no liquid level detection signal in step S17, the process proceeds to step S21 to check whether the nozzle switch 10 is turned off. If the nozzle switch 10 is ON in S21, it is determined that refueling is being performed, the process returns to S15, and the processes of S15 to S17 are repeated. However, when the nozzle switch 10 is off in S21, it is determined that the refueling nozzle 8 has returned the nozzle hook 9, and the process proceeds to S22, in which the output of the pump drive signal is stopped and the pump motor 3 is stopped. . Then, the exhaust timer is started in S23.

As described above, when the exhaust pump 16 is driven, the oil vapor sucked from the oil vapor suction port 13A of the intake hose 13 is supplied to the exhaust pump 16, the oil vapor concentration sensor 17,
The oil is released into the atmosphere from the oil vapor suction port 13A via the intake hose 13. During this time, the oil vapor remaining in the intake hose 13 and the oil vapor adhered to the oil vapor concentration sensor 17 are radiated by the air blow at the time of exhaustion, and the cleaning process is performed.

When the nozzle switch 10 is turned off in S20, or after the exhaust timer is started in S23, the process proceeds to S24 shown in FIG. 5, and the measurement time of the exhaust timer is necessary for the cleaning process in which the preset time is set. It is checked whether a predetermined time has elapsed. If the measurement time of the exhaust timer has exceeded the predetermined time in S24, the process proceeds to S25, where the output of the exhaust signal is stopped, and the exhaust pump 17 is stopped.

In S26, the exhaust timer is reset to end the cleaning process, and the current refueling process is ended. If the measurement time of the exhaust timer has not passed the predetermined time in S24, the process proceeds to S2.
Proceed to 7 to check whether the nozzle switch 10 has been turned on. If the nozzle switch 10 is off, the process returns to S24.

However, when the nozzle switch 10 is turned on in S27, the refueling nozzle 8 is removed from the nozzle hook 9 during the cleaning process to start the next refueling operation. For example, a message such as “during cleaning processing, refueling is impossible” is displayed on the liquid crystal display 20 to notify the operator of an error. This error notification returns the refueling nozzle 8 to the nozzle hook 9 and continues until the nozzle switch 10 is turned off (S29). When the nozzle switch 10 is turned off, the error notification is stopped (S30). After the error notification is stopped, the process returns to S24, and the processing of the exhaust timer is continued.

When the oil vapor concentration D1 sucked from the fuel tank is smaller than the threshold value L2 in S9, the oil type of the fuel tank is determined to be "light oil".
In S10, it is determined that the oil type of the fuel tank does not match the oil type of the oil liquid discharged from the oil supply nozzle 8 (in this embodiment, the oil type stored in the underground tank is "gasoline").

Therefore, in the next step S31, the pump motor 3 is not started, the refueling is prohibited, and a message such as "light oil refueling is impossible" is displayed on the liquid crystal display 20.
And an alarm for oil type abnormality is issued. Then, the process proceeds to S32 shown in FIG. 5 to perform the cleaning process. That is, the output of the intake signal to the intake pump 16 is stopped.
In the next step S33, an exhaust signal is output to activate the exhaust pump 17 and the exhaust hose 1 is controlled by the electromagnetic three-way valve 14.
Switching to the 3C side, the oil vapor sucked into the suction hose 13 is exhausted from the oil vapor suction port 13A.

Further, in S34, the nozzle switch 10
Check if is turned off. Then, the refueling nozzle 8 is returned to the nozzle hook 9 and the nozzle switch 10
Turns off, the process proceeds to S35, and the timer is reset. After that, the processing after S24 described above is executed.
Next, a modified example of the present invention will be described. FIG. 6 is a flowchart of the interruption process of the modification, and FIG. 7 is a flowchart of the main processing of the modification. This modification corresponds to the flowchart shown in FIG. 3 of the above-described embodiment, and the description of the flowcharts of FIGS. 4 and 5 is omitted in this modification.

First, the interrupt processing will be described. S in FIG.
At 41, the data update flag is set to ON.
Subsequently, in S42, the temperature calculated by the temperature measurement program 25A is read. The temperature measurement program 25A
Then, when the refueling nozzle 8 is not inserted in the refueling port, the atmospheric temperature is detected, and when the refueling nozzle 8 is inserted in the refueling port, the oil vapor temperature is detected.

In the next S43, the temperature measurement program 25
A threshold (L1, L2) for oil type determination based on the temperature (T1, T2) calculated by A is calculated and updated. In the present embodiment, the threshold value of the oil vapor concentration sensor is described as being updated to L1 or L2. However, since the threshold value is calculated in accordance with the temperature output value calculated by the temperature measurement program 25A, the threshold value is steplessly changed. Can be updated.

In S44, the output data output from the oil vapor concentration sensor 17, that is, the output voltage (D1) corresponding to the oil vapor concentration in the fuel tank is read. And S45
Then, the data update flag is turned off. This completes a series of interrupt processing. Note that the processes of S41 to S45 are repeatedly executed, for example, every 0.005 seconds, and the atmospheric temperature or the oil in the fuel tank is constantly changing even after the discharge pipe 8A of the refueling nozzle 8 is inserted into the refueling port. The steam temperature has been updated.

The data update flag is for determining whether or not the interrupt processing is being performed. When the data update flag is on, the interrupt processing is being performed, and when the data update flag is off, the interrupt processing is not being performed. Can be determined. Next, the main processing shown in FIG. 7 will be described. In S51 of FIG. 7, it is checked whether the nozzle switch 10 has been turned on. When the worker at the refueling station removes the refueling nozzle 8 from the nozzle hook 9 and turns on the nozzle switch 10, the process proceeds to S 52, and it is checked whether or not an insertion detection signal is output from the nozzle insertion sensor 11. When the discharge pipe 8A of the refueling nozzle 8 is inserted into the refueling port and an insertion detection signal is output from the nozzle insertion sensor 11 provided at the tip of the discharge pipe 8A, S
After a predetermined time (about 1 second) due to the delay processing of 52a, the process proceeds to S53.

Here, the delay processing of S52a waits for a fixed time sufficient for the oil vapor in the fuel tank sucked by the suction hose 13 to reach the oil vapor concentration sensor 17, and the oil vapor temperature is accurately measured. This is a process for detecting. Next S5
At 3, it is checked whether the data update flag is on. When the data update flag is on, the temperature output value calculated by the temperature measurement program 25A and the output data from the oil vapor concentration sensor 17 are being updated, and thus the apparatus enters a standby state until the end of the interrupt processing. When the data update flag is turned off, the process proceeds to S54, and the threshold value (L1, L1,
L2) and the output voltage (D1) from the oil vapor concentration sensor 17
And oil type judgment is performed.

In this embodiment, instead of the method of comparing the detection value of the oil vapor concentration sensor 17 with the threshold value to determine the oil type, the change rate of the detection value of the oil vapor concentration sensor 17 and the change rate of the detection value are obtained in advance by experiments. The changed rate may be compared as a threshold. Alternatively, the oil type determination may be performed by combining the comparison of the detection value of the oil vapor concentration sensor 17 and the comparison of the change rate of the detection value.

Subsequently, in S55, the above oil type determination result and the oil type of the oil supply nozzle 8 registered in the memory in advance (in this embodiment, the oil type of the oil liquid stored in the underground tank is "gasoline"). ) Or not. Therefore, in S55, when the oil type determination result of the oil vapor from the fuel tank is “gasoline”, the oil type matches in the case of the present modification, so that the process proceeds to S56, and refueling permission is set. Then, after S56, the above-described S12
The same processing as that of S30 is executed.

If it is determined in S55 that the oil type of the oil vapor from the fuel tank is "light oil", the flow proceeds to S57 because the oil types do not match in the case of the present modification.
In S57, the pump motor 3 is not started, the refueling is prohibited, and a message such as "light oil refueling is impossible" is displayed on the liquid crystal display 20, and an alarm of oil type abnormality is issued.

Then, after S57, S32 to S described above are performed.
The same processing as 35 is performed. In this way, the temperature measurement program 2 is executed by the interrupt processing executed at predetermined time intervals.
Since the thresholds (L1, L2) set based on the temperature output value calculated by 5A and the output voltage (D1) from the oil vapor concentration sensor 17 are sequentially updated, the latest temperature and oil type are determined when the oil type is determined. The oil type can be determined based on the data.

Since the oil type can be determined on the basis of real-time temperature and oil type data, for example, the threshold value (L2) is accurately set between gasoline having a small difference in oil vapor concentration and light oil containing the additive. be able to. Therefore, the lower limit of the oil vapor concentration of gasoline and the upper limit of the oil vapor concentration of the light oil containing the additive can be determined with high accuracy.

Therefore, even if the oil vapor concentration of the light oil containing the additive increases due to the temperature increase, the threshold value corresponding to the oil vapor temperature is sequentially updated by the interrupt processing, so that the oil type having a small oil vapor concentration difference can be accurately determined. Can be determined.
In the above embodiment, the gasoline and the light oil are described as being determined. However, other types of oil may be determined.

Further, in the above-described embodiment, the signal from the nozzle insertion sensor 11 detects that the refueling nozzle 8 has been inserted into the refueling port. However, the present invention is not limited to this. Nozzle 8 is nozzle hung 9
If a predetermined time (for example, about 3 to 5 seconds) elapses after being removed from the oil supply port, it may be determined that the refueling nozzle 8 has been inserted into the refueling port. Of course, the insertion may be determined based on the rate or the like.

[0072]

As described above, according to the first aspect of the present invention, the temperature of the environment of the oil vapor concentration sensor is measured from the current voltage flowing through the oil vapor concentration sensor, and based on the temperature thus measured, In order to change the oil type determination value, it is possible to detect the temperature of the oil vapor sucked for the oil type determination without using the temperature sensor, and it is possible to perform the oil type determination according to the temperature condition. Therefore, the oil type determination accuracy can be further increased, and the reliability of the oil type determination can be increased. Therefore, even if the temperature in the fuel tank changes due to the surrounding environment, it becomes possible to determine the oil type of the oil in the fuel tank based on the optimum oil type determination value corresponding to the temperature at that time. Even when the oil types of two types of oil liquids having a small difference are determined, the oil type can be accurately determined, and the oil type determination accuracy can be further improved. For example, since the oil type determination value can be accurately set between gasoline having a small difference in oil vapor concentration and light oil with additive, the lower limit of the oil vapor concentration of gasoline and the oil vapor concentration of light oil with additive can be set. It is possible to determine the upper limit value with high accuracy, and accurately determine whether it is gasoline or light oil.

According to the second aspect of the present invention, the temperature measuring means obtains the temperature rise value and the resistance value from the current value flowing through the heater while keeping the voltage applied to the heater of the oil vapor concentration sensor constant. To determine the ambient temperature of the oil vapor concentration sensor from the resistance value and the resistance value, it is possible to detect the temperature of the oil vapor sucked for oil type determination with a relatively simple configuration without using a temperature sensor, Since the oil type determination according to the temperature condition is possible, the accuracy of the oil type determination can be further improved and the reliability of the oil type determination can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of one embodiment of a fueling device according to the present invention.

FIG. 2 is a graph for explaining characteristics of an output of an oil vapor concentration sensor and a temperature measurement program.

FIG. 3 is a flowchart of a refueling process executed by a control circuit.

FIG. 4 is a flowchart of a refueling process executed subsequent to the process of FIG. 3;

FIG. 5 is a flowchart of a refueling process executed subsequent to the process of FIG. 4;

FIG. 6 is a flowchart of an interrupt process according to a modified example of the present invention.

FIG. 7 is a flowchart of a main process according to a modified example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Measuring machine 3 Pump motor 4 Pump 5 Flowmeter 7 Oil supply hose 8 Oil supply nozzle 9 Nozzle hook 10 Nozzle switch 11 Nozzle insertion sensor 13 Suction hose 14 Three-way solenoid valve 15 Intake pump 16 Exhaust pump 17 Oil vapor concentration sensor 18 Display device 25 Control Circuit 25A Temperature measurement program 25B Oil type judgment program 25C Oil type judgment value setting program

Claims (2)

[Claims] 1. An oil vapor in a fuel tank is supplied to an oil vapor concentration sensor via a suction system path opened at a tip side of an oil supply nozzle, and a detection value output from the oil vapor concentration sensor and oil supply from the oil supply nozzle are provided. A control unit for permitting or prohibiting the supply of the oil liquid to the oil supply nozzle by comparing with an oil type determination value corresponding to the predetermined oil type. Temperature measuring means for measuring from a current voltage flowing through the oil vapor concentration sensor; and oil type judgment value setting means for changing the oil type judgment value based on the temperature measured by the temperature measuring means. Characteristic refueling device. 2. The oil supply device according to claim 1, wherein the temperature measuring unit obtains a temperature rise value and a resistance value from a current value flowing through the heater while keeping a voltage applied to the heater of the oil vapor concentration sensor constant. An oil supply device comprising: a temperature conversion unit; and a temperature calculation unit that calculates an environmental temperature of the oil vapor concentration sensor from a temperature rise value and a resistance value output by the temperature conversion unit.