JPH0692398A - Fuel feeder - Google Patents

Abstract

PURPOSE:To make a common tube serve both as a vapor sampling tube for determining a fuel type and a tube for detecting a full tank. CONSTITUTION:A gas detector and a pressure detector are connected in the middld of a tube whose tip is connected to an open hole 24 at the tip of a dispensing tube of a fuel feed nozzle and rear end is connected to a negative pressure generator. When the negative pressure generator is actuated to pull a fuel feed lever 20, a stop valve 26 opens to have a pressure sensor signal varied and also vapor in an automobile fuel tank is fed into a gas sensor. Thus a fuel type in the automobile fuel tank can be determined. If fueling is started in this state and fuel is supplied up to the vicinity of a fuel port, the open hole 24 is closed by the fuel so that the signal from the pressure sensor again varies. With this change in the signal from the pressure sensor, a full tank is determined. Thus a single vapor sampling tube can both determine the fuel type and detect the full tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling device that automatically stops refueling operation when fuel supply to an automobile tank is full.

2. Description of the Related Art A variety of automatic functions are incorporated in a refueling device for the purpose of ensuring safety during refueling, one of which is to automatically refuel when a refueling amount reaches a refueling port of an automobile fuel tank. The automatic stop function is to stop automatically, and the other one is an oil type determination function that guides the vapor in the vehicle fuel tank to a gas sensor to determine whether or not the fuel oil to be supplied is suitable.

In the former auto stop function, an opening provided at the tip of a fueling nozzle and an automatic valve closing mechanism provided in the nozzle body are connected by a pipe line, and a negative pressure is constantly applied to the pipe line during refueling. Every other time, the pressure changes when bubbles and fuel oil in the tank reach the opening, and the latter oil type determination function is used for automobiles by a pipe line extended to the opening at the tip of the nozzle cylinder. The vapor in the fuel tank is guided to the gas sensor in the main body of the refueling device, and the type of oil is determined based on the vapor concentration.

[0003]

For this reason, as shown in FIG. 5, an opening C for realizing an automatic nozzle function and a conduit D communicating with this are formed in the cylinder tip portion B of the oil supply nozzle A, as shown in FIG. Further, it is necessary to dispose the opening E that constitutes the vapor sampling conduit for judging the oil type and the conduit F that communicates with this, which complicates the structure of the nozzle and increases the flow resistance. It was The present invention has been made in view of such a problem, and an object of the present invention is to configure a sampling conduit for oil type determination and a conduit for detecting a liquid level rise by a single conduit. It is to provide a novel refueling device that can do.

[0004]

In order to solve such a problem, in the present invention, one end is located at the tip of the discharge pipe of the oil supply nozzle, and the other end is located in the conduit connected to the negative pressure generating means. Connect the gas detection means and the pressure detection means, determine the oil type by the output of the gas detection means immediately after the start of refueling, and determine that the tank is full based on the pressure drop signal from the pressure detection means after the oil type determination and refuel. A control means for stopping the operation is provided.

[0005]

The oil supply nozzle is removed from the nozzle hook, and the signal from the gas detection means is taken in by the pressure increase signal from the pressure detection means to determine the oil type. Next, the pressure drop signal from the pressure detecting means generated after the refueling operation is started is
Since the opening at the tip of the nozzle was blocked by the fuel oil, it was determined that the tank was full.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the present invention, in which reference numeral 1 is an oil supply pump, and a flow meter 2
Is connected to the main valve MV via the refueling hose 3 and is connected to the refueling nozzle 4 from here by the refueling hose 3. Reference numeral 5 is a flow rate pulse transmitter attached to the flow meter 2, which outputs a pulse proportional to the flow rate to the control device 6, converts it into an oil supply amount, and outputs it to the display device 7.

Reference numeral 10 denotes a negative pressure / positive pressure generating means, which receives compressed air from a compressed air source 11 through a compressed air supply pipe 12 as shown in FIG. 2, and is supplied to an ejector 13 via a valve V1. Further, the gas is supplied to the gas sensor GS via the throttle valve 14 and the valve V2. Further, the air discharged from the ejector 13 is supplied to the air ejection port 16 of the nozzle accommodating concave portion 15, and the negative pressure generated in the ejector 13 is supplied to the gas sensor GS through the switching valve V3 and the conduit 18. Between the negative pressure supply port of the ejector 13 and the switching valve V3, there is provided a means for detecting a change in pressure in the pipe line 18, and in this embodiment, a pressure switch PS for outputting a signal when the negative pressure becomes higher than a certain value. It is connected. Compressed air from the compressed air supply pipe 12 is supplied to the switching valve V3 via the throttle valve 17. Reference numeral 9 in the figure indicates an alarm.

FIG. 3 shows an embodiment of a fueling nozzle used in the present invention, in which a main valve 22 for releasing the fuel oil of the fueling hose 3 to the cylinder tip portion 21 by opening the fueling lever 20 by pulling up the fueling lever 20. It is housed in the body portion 23, and an opening 24 is formed at the tip of the barrel tip portion 21. The opening 24 is formed by a pipe 25 through a stop valve 26, which will be described later.
Connected to 7. Reference numeral 26 denotes the above-mentioned stop valve, which is provided with an operating rod 28 which is interlocked with the refueling lever 20. When the operating rod 28 is projected, it is closed by the check valve 29 (FIG. 3), and when the operating rod 28 is refueling lever. The channel is opened in the state of being pushed in by 20.

Next, the operation of the apparatus thus constructed will be described with reference to FIG.
It will be described based on the flowchart shown in FIG. When the refueling nozzle 4 is removed from the nozzle hook 30 and the nozzle switch SW is turned on (step a), the control device 6 causes the indicator 7 to operate.
And zero the valve V1 (step B). As a result, compressed air is supplied to the ejector 13, and the negative pressure generated by the ejector 13 is supplied to the switching valve V3. In the present state, the switching valve V3 is set to the a position, so the negative pressure is supplied to the air tube 27 via the pipe line 18. In this state, the stop valve 26
Is closed, the air tube 27 and the conduit 1 are closed.
A strong negative pressure acts on 8, and the pressure switch PS is switched from OFF to ON (step C).

In this state, when the refueling nozzle 4 is inserted into the vehicle fuel tank and the refueling lever 20 is pulled up, the stop valve 26 is opened in conjunction with the refueling lever 20 and communicates with the atmosphere through the opening 24. The pressure in the air tube 27 and the pipeline 18 rises, and the pressure switch PS is turned off (step d).

The control unit 7 turns off the pressure switch PS.
Gas sensor G when a certain time has passed since
The output signal from S is taken in to determine the oil type (step E). As a result of the determination, when the type of oil to be refueled and the type of oil in the vehicle fuel tank match (step F), the pump motor 30 is operated, and the main valve MV is opened to release the fuel oil. Supply from 4 to the fuel tank (step).

On the other hand, the result of determining the oil type (step
F) When the oil types do not match, the control device 6 closes the valve V1 to stop the generation of negative pressure by the ejector 13, and opens the valve V2 to open the air tube 2
A small amount of air is supplied to 7 to evacuate the check valve 29 to the outside air for scavenging, and an alarm 9 is activated to prompt confirmation of the oil type (step H). After the confirmation, when the nozzle 4 is returned to the nozzle hook and the nozzle switch SW is turned off (step S), the control device 6 stops the alarm operation of the alarm 9 (step S). After the operation of the alarm 9 is stopped, the valve V2 is closed and the valve V3 is switched to the b position to supply a large amount of air to the air tube 27 (stepner). As a result, the vapor remaining in the gas sensor GS and the air tube 27 is scavenged to the outside air from the check valve 29. When a predetermined time T3, for example, 5 seconds has elapsed (step), the valve V3 is returned to the position a to form a flow path capable of supplying the negative pressure from the ejector 13 to the air tube 27 for the next refueling operation. Prepare (Step
Mu).

On the other hand, as a result of the judgment, when the oil type is matched and the fuel is supplied, the oil is supplied as long as the opening 24 at the tip of the nozzle is in communication with the atmosphere, that is, while the pressure switch PS is kept in the OFF state. Will continue (step
Le, Oh, Wa).

As the refueling progresses, the bubbles generated in the fuel tank of the vehicle rise up to near the refueling port. In such a state, the bubbles generated in the automobile fuel tank rise to the nozzle cylinder tip portion 21, so that the opening 24 is closed by the bubbles and a strong negative pressure is generated in the air tube 27 and the conduit 18. . As a result, the pressure switch PS is turned ON (step), and the control device 6 closes the main valve MV (step C). When the refueling is stopped, the bubbles in the vehicle fuel tank gradually disappear, and when the opening 24 of the nozzle barrel tip 21 is connected to the atmosphere again within a fixed time T1, for example, within 3 seconds (step yo), the pressure switch PS is turned on. O
Become FF (stepping). The control device 6 opens the main valve MV halfway and restarts the liquid supply (step o,
T). When refueling is continued for a fixed time T2, for example, 2 seconds (step E), if refueling is continued, the main valve MV is fully opened (step W) and refueling is continued.

If fueling is further continued in this state, the liquid level rises near the fueling port of the vehicle fuel tank, the opening 24 of the cylinder tip portion 21 of the fueling nozzle 4 is blocked by fuel oil, and the pressure switch PS is turned on. It becomes a state (step).
As a result, the control device 6 closes the main valve MV (step C). In this case, since the opening 24 is blocked by the fuel oil, the pressure switch PS still maintains the ON state even after the elapse of the fixed time T1 (step Y). At this point, the control device 6 has the valve V
1 is closed to prevent a negative pressure from being generated by the ejector 13, and the valve V2 is opened to supply a small amount of air to scaveng the gas sensor GS, the conduit 18 and the air tube 27. At the same time, the main valve MV is throttled so that the flow rate is suitable for integer lubrication, and integer lubrication is started (step
Re).

After the integer refueling is started, when the most significant integer value is reached (step S), the pump 1 is stopped and at the same time the main valve MV is closed (step S). When the nozzle 4 is returned to the nozzle hook 30 and the nozzle switch SW is turned off (step), the valve V2 is closed,
Also, switch the valve V3 (stepper). As a result, a large amount of air is supplied into the air tube, and the air tube is scavenged (stepper) and kept for a certain time T3.
After that (step), the switching valve V3 is returned to its original position to prepare for the next refueling.

In this embodiment, the air from the compressed air source is converted into the negative pressure by the ejector and used, but it is possible to generate the negative pressure and the positive pressure at the same time like the diaphragm pump. It is clear that the same effect can be obtained by using a pump. Further, in this embodiment, the description has been made by taking the integer refueling as an example, but it is clear that the same effect can be obtained even when applied to the normal refueling.

[0018]

As described above, in the present invention,
One end is located at the tip of the discharge pipe of the fueling nozzle, the other end is connected to the negative pressure generating means, the gas detecting means and the pressure detecting means are connected, and by the output of the gas detecting means immediately after the start of refueling. Since a control means for determining the oil type and stopping the refueling operation by determining the full tank by the pressure drop signal from the pressure detecting means after the oil type determination is provided, the sampling pipe line and the full tank for the oil type determination are provided. The pipeline for detection and the pipeline can be configured by one pipeline, and the pipeline configuration can be simplified.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention.

FIG. 2 is a diagram showing a pipeline configuration that constitutes a sampling pipeline for automatic liquid level detection and oil type determination.

FIG. 3 is a cross-sectional view showing an embodiment of an oil supply nozzle used in the present invention.

4 (a) to (c) are flowcharts showing the operation of the same apparatus, respectively, wherein I in FIG. 4 (a) is I in FIG. 4 (c) and II in FIG. Connect to II of (b), III of (b) to III of (a), and further of (a)
IV is connected to IV in Figure (c).

FIG. 5 is a cross-sectional view showing an example of a conventional oil supply nozzle used in an oil supply device having an automatic stop function and an oil type determination function.

[Explanation of symbols]

 1 Lubrication Pump 2 Flow Meter 4 Lubrication Nozzle 5 Pulse Transmitter 10 Negative Pressure / Positive Pressure Generation Means 20 Lubrication Lever 21 Cylinder Tip 22 Main Valve 24 Opening 25 Pipeline 26 Stop Valve 27 Air Tube 29 Check Valve PS Pressure Switch GS Gas sensor V1, V2 valve V3 switching valve

[Procedure amendment]

[Submission date] September 17, 1993

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention.

FIG. 2 is a diagram showing a pipeline configuration that constitutes a sampling pipeline for automatic liquid level detection and oil type determination.

FIG. 3 is a cross-sectional view showing an embodiment of an oil supply nozzle used in the present invention.

FIG. 4 is a flowchart showing the operation of the above apparatus.

FIG. 5 is a flowchart showing an operation of the same apparatus.

FIG. 6 is a flowchart showing the operation of the above apparatus.

FIG. 7 is a cross-sectional view showing an example of a conventional oil supply nozzle used in an oil supply device having an automatic stop function and an oil type determination function.

[Explanation of Codes] 1 Lubrication pump 2 Flow meter 4 Lubrication nozzle 5 Pulse transmitter 10 Negative pressure / positive pressure generation means 20 Lubrication lever 21 Tube tip 22 Main valve 24 Open hole 25 Pipe line 26 Stop valve 27 Air tube 29 Reverse check Valve PS Pressure switch GS Gas sensor V ₁ , V ₂ valve V ₃ switching valve

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

Claims (1)

[Claims] 1. A gas detecting means and a pressure detecting means are connected to a pipe line, one end of which is located at a tip of a discharge pipe of a fueling nozzle, and the other end of which is connected to a negative pressure generating means. An oil supply device comprising a control means for determining an oil type based on the output of the detection means, and determining that the oil is full based on a pressure drop signal from the pressure detection means after the oil type determination and stopping the oil supply operation.