JP2605510B2 - Refueling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply apparatus for automatically judging the type of fuel oil by sucking vapor in an automobile fuel tank.

[0002]

2. Description of the Related Art There are two types of automobiles, one that uses gasoline and the other that uses light oil. The use of incompatible fuels causes serious problems for the engine. Therefore, prior to refueling, the vapor in the vehicle fuel tank is sucked into the gas sensor to determine the type of fuel in the fuel tank, and the type of oil to be used in the vehicle and the type of fuel oil to be refueled match. There has been proposed a refueling device which makes it possible to discharge fuel only in such a case (Japanese Patent Laid-Open No. 1-199900).

[0003] Such a refueling device is usually provided with a combustion type gas sensor or a semiconductor type gas sensor for detecting a vapor concentration, from which a vapor from an automobile fuel tank is guided to determine an oil type based on the vapor concentration. It is configured as follows. In other words, in the case of gasoline vehicles, the vapor concentration is high,
Further, in the case of a light oil vehicle, since the vapor concentration is low, the oil type of the automobile fuel tank is determined using the difference between these vapor concentrations.

[0004]

By the way, in order to remove water remaining in the fuel tank of the automobile, a so-called drainage agent mainly composed of alcohol is mixed into the fuel tank. In such a case, since the vapor pressure of the drainage agent is higher than that of light oil, the vapor concentration becomes higher than in the case of light oil alone, and there is a fear that a light oil vehicle may be erroneously determined as a gasoline vehicle. The present invention has been made in view of such a problem, and its purpose is to accurately determine the oil type of an automobile fuel tank and to mix highly volatile components such as a draining agent. An object of the present invention is to provide a novel refueling device capable of preventing ambiguous determination of light oil.

[0005]

In the present invention in order to solve the Means for Solving the Problems] The problems, a gas detecting means for detecting the concentration of the vapor of the automotive fuel tank, light oil and determine the constant on the basis of the density of the vapor The first reference level for
No. for determining gasoline based on the concentration of vapor
And a second level after the signal from the gas detection means by gasoline vapor exceeds the first level.
Preset first time required to reach the criterion
In this case, the signal from the gas detecting means is at a second reference level.
Is exceeded, it is determined to be gasoline, and the second reference level
If the first time is exceeded before crossing the bell, the oil type
It is determined that the determination is impossible, and furthermore, a signal
Does not exceed the first reference level even after the preset second time has elapsed.
A control means for judging light oil when the oil does not exceed the bell is provided.

[0006]

The oil type is determined in consideration of the determination level of light oil and gasoline and the time exceeding the determination level of light oil and exceeding the determination level of gasoline, so that the vapor concentration is higher than the determination level of light oil. In some cases, in the case of light oil containing a drainage agent that reaches the same level as the concentration of gasoline, it is determined that the oil type cannot be reliably determined.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows an example of an oil supply device to which the present invention is applied. In the figure, reference numeral 1 denotes an oil supply pump driven by a pump motor M, and a nozzle hose at a discharge port through a flow meter 2. 3 is connected so that the fuel oil in the underground tank is sent to the fueling nozzle 20. The flow meter 2 is provided with a flow rate pulse transmitter 4, and a signal from the flow rate pulse transmitter 4 is displayed on a display 6 by a control device 5 as a refueling amount.

In the figure, reference numeral 10 denotes an air supply source. An air conduit extending from the air supply source is provided with a normally-closed first valve V via a mist separator 12 and a regulator 13 as shown in FIG.
₁ , a second valve V ₂ , and a third valve V ₃ composed of a three-port two-position switching valve are connected in parallel. The first valve V ₁ is further connected to a nozzle hook 8 via a vacuum ejector 14. The second valve V ₂ communicates with the air conduit 11 via the fixed orifice 16, and the third valve V ₃ communicates with the fixed orifice 17 through the air nozzle 15 facing the inside of the cylinder tip insertion recess 9. And a connection between an air conduit 11 and a vacuum ejector 14, which will be described later, at a position a.
In the position, it is connected to make a connection between the air supply source 10 and the air conduit 11.

On the other hand, as shown in FIG. 3, the vapor conduit 21 passes through a vapor suction port 23 opened in the vicinity of the distal end of the cylinder tip 22 of the liquid supply nozzle 20 through a stop valve 25 which is opened and closed by a lever 24. It reaches the inside, and is connected to a vacuum ejector 14 where through the gas sensor GS and the third valve V ₃ and the pressure switch PS. These first, second, and third valves V ₁ , V ₂ , and V ₃ are constituted by solenoid valves driven by an output signal from the control device 5, and the first valve V ₁ is By being energized, the flow path from the air supply source 10 to the vacuum ejector 14 is opened, and the inside of the air conduit 11 connected to the vacuum ejector 14 is set to a negative pressure to suck the vapor. The second valve V ₂ is energized to connect the air supply source 10 to the air conduit 11, and the third valve V ₃ is normally deenergized to normally connect the air conduit 11 and the vacuum ejector 14. After the determination of the oil type and after the refueling is stopped, the position is switched to the position b by being urged by a signal from the control device 5, and the air supply source 10 is communicated with the air conduit 11 and the air supply source 10. It is configured to send air from 10 into the vapor conduit 21 to scavenge the inside. Pressure switch P provided in the middle of air conduit 11
S is configured as a responsive switch that is turned on by a diaphragm that is deformed when the pressure in the conduit 11 becomes negative.

FIG. 3 shows an embodiment of a fuel supply nozzle. A main valve 29 which is opened by pulling up a fuel supply lever 24 to feed fuel oil of a fuel supply hose 3 to a cylinder tip portion 22 is accommodated in a body portion 32. Further, a vapor conduit 21 for connecting a vapor suction port 23 opened at the tip and a stop valve 25 is disposed in the cylinder tip portion 22. The stop valve 25 is
When the lever 24 is pulled down, the air tube 31 and the vapor conduit 21 are closed, and compressed air is supplied from the air tube 31 via the check valve 26 to the vapor conduit 21. , And when the fuel supply lever 24 is pulled up, the air tube 31 and the vapor conduit 21 are connected to each other.
Reference numeral 27 in the figure denotes an air suction pipe that activates the automatic valve closing mechanism 28 by negative pressure when the cylinder tip 22 of the refueling nozzle 20 is closed by the fuel oil in the fuel tank.
W indicates a nozzle switch provided near the nozzle hook.

Next, the operation of the above-described apparatus applied to a gasoline refueling apparatus will be described with reference to a flowchart shown in FIG. Nozzle 20
The removed from the nozzle hanger 8 when the nozzle switch SW is turned ON (step b), the control unit 5 to open the this biases the first valve V ₁ with thereby zero the display 6 (Step b ). As a result, air from the air supply source 10 flows into the vacuum ejector 14, and the air conduit 11,
The inside of the air tube 31 is set to a negative pressure. In this state, since the lever 24 is still lowered, the stop valve 25 connected to the vapor conduit 21 is in a closed state, so that a strong negative pressure acts in the air conduit 11 and the pressure is reduced. The switch PS is turned ON by this negative pressure (step C).

In this state, when the fueling nozzle 20 is inserted into the fuel tank of the automobile and the lever 24 is pulled, the main valve 29 is opened and the lever 24 also opens the stop valve 25. As a result, the air containing the vapor in the fuel tank rapidly flows into the air tube 31 from the vapor suction port 23, the strong negative pressure in the air conduit 11 disappears rapidly, and the pressure switch PS is turned off (step d). ).

The controller 5 reads the level L0 of the output signal from the gas sensor GS before the air containing the vapor in the fuel tank reaches the gas sensor GS as a reference signal for zero vapor concentration, and stores it in the storage means. (Step E), L0 + Lg and L0 + obtained by adding the concentration Lg due to gasoline and the concentration Ld due to light oil, respectively.
Ld is set as a gasoline determination level and a light oil determination level. In this state, since the pump motor M is stopped, the fuel oil is not discharged.

Subsequently, the vapor in the vehicle fuel tank reaches the gas sensor GS. Since the gasoline vapor has a high concentration, the gas sensor GS as shown in FIG.
Immediately outputs a signal exceeding the reference level L0 + Ld for light oil determination (step F), and outputs a signal exceeding the gasoline determination level L0 + Lg within a time ΔT ₁ (for example, 0.4 seconds) (step Y). (Step). For this reason, the control device 5 determines that the fuel of the vehicle to be refueled is gasoline, and the first valve V ₁
With it closed and the second valve V ₂ is opened to start the fuel supply by operating the pump motor M at the same time (step
J). Accordingly, after the air in the air source 10 in parallel with refueling operation is restricted by the second valve V ₂ from the orifice 16, the air duct 11 flows in small portions to the vapor conduit 21 through an air conduit 11, air The gas sensor G is used to scavenge the inside of the tube 31 and the vapor conduit 21 and to prevent the vapor from flowing into the gas sensor GS during refueling.
S is prevented from deteriorating.

When the refueling of the predetermined amount is completed and the refueling lever 24 is pulled down to close the main valve 29, the stop valve 25 is also closed in conjunction with the lever 24. When the nozzle 20 is returned to the nozzle hook 8 and the nozzle switch SW is turned off (step リ), the control device 5 stops the pump motor M (step ヌ), then closes the second valve V ₂ , further switching the third valve V ₃ again b position from a position (step le). As a result, a large amount of air from the air supply source 10 flows into the vapor conduit 21, opens the check valve 26 provided on the stop valve 25, and discharges the vapor remaining there to the atmosphere together with the air. Clean with fresh air. The predetermined time T, for example, at a stage where 5 seconds has elapsed (step e), to return the third valve V ₃ to a position (step Wa), ready for the next refueling.

When the oil supply lever 24 is pulled up and the pressure switch PS is switched from ON to OFF (step d), the output of the gas sensor GS is lower than the light oil determination level L0 + Ld (step f). When the level is maintained for a predetermined time ΔT ₂ , for example, 2.5 seconds ((b) in FIG. 5) (step
Ca), the controller 5 determines that the fuel oil of a motor vehicle tank is gas oil, first closes the valve V _1, also by opening the second valve V _2, further by alarm 7 Notify that the oil type is different (Stepta). Thereby air in the air supply source 10 is a second valve V ₂ from the air conduit 11, as well as scavenging of these flows into the air tube 31, and the vapor conduit 21, the vapor is prevented from flowing into the gas sensor GS Deterioration of the gas sensor GS is prevented.
When the nozzle 20 is returned to the nozzle hook 8 and the nozzle switch SW is turned off by noticing the misidentification of the oil type (step
D), the control device 5 stops the operation of the alarm 7 (step S), and prepares for the next refueling through the steps (l) to (w) described above.

On the other hand, a draining agentMixedTo the light oil truck
In order to refuel, the nozzle of the nozzle 20
When the tip 22 is inserted, the gas oil
Gas and dewatering agent vapor flow in, so the gas sensor
GSFromIs the difference between the reference level L0 and the concentration Ld of the gas oil vapor.
Higher than the sum L0 + LdOf levelSignal outputAlthough
(Step f) ((c) and (d) in FIG. 5), With a draining agent
The vapor with light oil,Lower concentration than gasoline vapor
So light oilJudgment criteriaExceeds level L0 + LdAlthough,
Exceeds the reference level L0 + Lg for gasoline judgmentUntil
The specified time ΔT ₁ Elapses(Step).
Therefore, the control device 5Remove gas oil mixed with drainage agent
Without misjudgment as sorin,Gasoline and light oil
Determined that the fuel is indistinguishableDo(Step
Yo). AndFirst valve V₁And the second valve V_TwoTo
Open the valveThe air from the air supply source 10 passes through the second valve V2.
Air pipe 11, air tube 31, and vapor
They are supplied into a conduit 21 to scavenge them and at the same time
Gas vapor from flowing into the gas sensor GS
To prevent deterioration of the gas sensor GS,Alarm 7
To inform that the oil type cannot be determined (step
 Ta).oilNozzle 20 is nozzle
When the nozzle switch SW is turned off after returning to the hook 8,
(Step), the control device 5 stops the operation of the alarm 7
(Step S) and the steps (l) and
Prepare for the next refueling through the process of sol. This allows
Ahead of an accident of refueling gasoline to a gasoline car accidentally
Can be prevented.

In this manner, every time the nozzle is removed from the nozzle hook and the fuel supply lever 24 is pulled up, the control device 5 determines the level L0 of the output signal from the gas sensor GS based on clean air as a reference for zero vapor concentration. Loading the signal (step e), and stores the reference level V ₀ in the memory means, the concentration Lg due to gasoline, and the concentration Ld due to gas oil obtained by adding the respective L0 + Lg, and L0 + L
Update d. This makes it possible to automatically set the accurate determination level for oil type determination regardless of changes in sensitivity due to aging of the gas sensor or changes in the concentration of vapor remaining in the vapor sampling path. it can.

In this embodiment, the description has been given of the case where the draining agent is mixed in the light oil. However, other misrecognition factors, for example, the case where gasoline dripping from the nozzle is mixed in the light oil fuel tank, or the case where the underground is It is apparent that uncertain oil type determination can be prevented even in an environment where the oil type determination is inconvenient, such as when the surroundings are filled with gasoline vapor by refueling the tank. In this embodiment, the gasoline refueling device has been described as an example. However, when the present invention is applied to a light oil refueling device, step (f) in the flowchart shown in FIG.
When step S) is reached, steps (h) and subsequent steps may be executed.

[0020]

As described above, in the present invention ,
A gas detecting means for detecting the concentration of the vapor of the automotive fuel tank, first to determine the light oil based on the concentration of vapor
Gasoline based on the reference level of 1 and the concentration of vapor
A second reference level for determining
The signal from the gas detector by vapor exceeds the first criterion.
Is set beforehand to reach the second criterion
Within the first time period, the signal from the gas detection means
If it exceeds the sub-level, it is determined to be gasoline and the second
If the first time is exceeded before the standard level is exceeded
It is determined that the oil type cannot be determined.
Even if the signal has been set for a second time, the first base
If it does not exceed the sub-level, control means to judge it as light oil
So that not only the concentration of vapor but also gas detection means
Draining agent is mixed as a judgment factor even when the signal rises
To prevent accidentally determining light oil as gasoline.
Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a fuel supply device to which the present invention is applied.

FIG. 2 is a block diagram showing an embodiment of a sampling mechanism of the apparatus.

FIG. 3 is a cross-sectional view showing one embodiment of a refueling nozzle used in the present invention.

FIG. 4 is a flowchart showing an operation of the above device.

FIG. 5 is a diagram showing the operation of the above device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump 2 Flow meter 3 Nozzle hose 4 Flow rate pulse transmitter 5 Control device 6 Indicator 7 Alarm 14 Vacuum ejector 20 Nozzle 21 Vapor conduit 23 Vapor suction port 25 Stop valve 30 Opening 31 Air tube PS Pressure switch GS Gas sensor SW nozzle switch

Claims (1)

(57) [Claims] 1. A gas detecting means for detecting the concentration of the vapor of the automotive fuel tank, light oil based on the concentration of the vapor
A first reference level to determine a constant and, concentrated in the vapor
The second reference level for judging gasoline based on the degree
Gas detection means by gasoline vapor
Signal exceeds the first criterion and then reaches the second criterion
Within a first predetermined time required to perform
The signal from the power detection means exceeds the second reference level
Is judged to be gasoline and exceeds the second reference level
If the first time has passed by then, it is judged that the oil type cannot be determined.
And the signal from the gas detection means is set in advance.
Not exceed the first reference level even after the second time has elapsed.
In this case, the oil supply device is provided with a control means for determining that the oil is light oil .