JPH03240691A - Oil supplying device with oil type discriminating function - Google Patents

Abstract

PURPOSE:To clarify a signal input time point from a gas sensor and to accurately discriminate oil type by discriminating the oil type by the output of the sensor after predetermined time is elapsed from when a conduit is returned from a negative pressure to the atmospheric pressure. CONSTITUTION:When a nozzle tube 32 is inserted into a vehicle fuel tank and an oil supply lever 34 is pulled up, a valve 36 of a vapor suction tube 35 is opened, and the tube 35 is connected to the tank. Accordingly, the pressure of a conduit 12 is reduced. Thus, the diaphragm 14a of a pressure sensor 14 is returned to its original position, and a signal from negative pressure switch means 26 is vanished. In this state, vapor in the tank is fed to a sensor room 11 through the tube 35 and the conduit 12 by an ejector 8. A controller inputs a signal from a gas sensor 15 after a predetermined time, for example 3sec, from when the signal of the means 26 is vanished to discriminate the type of fuel oil in the tank.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention automatically determines the type of fuel oil in an automobile tank by analyzing the fuel oil vapor remaining in the automobile t#, #+ tank. Install a liquid supply device designed to do so.

(Prior art) A refueling device that automatically determines the type of fuel oil to be refilled by analyzing fuel vapor, so-called vapor, in an automobile fuel tank is disclosed in Japanese Patent Laid-Open No. 64-58697. As described above, a gas sensor is disposed in the middle of the pipeline sucked into the mover 8 in the tank, and the type of fuel oil is determined when a signal from the gas sensor is output.

(Problem to be solved by the invention) However, if the automobile fuel tank and the gas sensor are connected through a relatively long pipe, that is, if the gas sensor is placed on the side of the fuel supply system, vapor will reach the gas sensor. It takes a long time to complete the process, and the timing at which the output of the gas sensor is taken in for discrimination becomes uncertain, which may lead to a mistake in determining the oil type.

The present invention was made in view of these problems, and its purpose is to provide a new oil supply system M that can accurately determine the type of oil by clarifying the time point at which the signal from the gas sensor is taken in. The goal is to provide the following.

(Means for Solving the Problems) In order to solve such problems, in the present invention, a refueling pump and a flow rate measuring means are provided in a pipe connected to an oil storage tank, and a refueling mechanism is provided with a refueling nozzle at the tip. and a gas sensor is provided in the middle of a pipe line connected to a vapor suction means, and after a predetermined time has elapsed from the time when the pipe line returns from negative pressure to atmospheric pressure, the output of the gas sensor is used. A means to determine the type of oil has been provided.

(Function) The output of the gas sensor is taken in and determined after a certain period of time has elapsed since the positive pressure returned to atmospheric pressure, that is, the time until the vapor in the automobile fuel tank reaches the gas sensor. The type of oil can be determined with high reliability.

(Example) Hereinafter, details of the present invention will be explained based on an illustrated example.

FIG. 1 shows an embodiment of a refueling system to which the present invention is applied, and reference numeral 1 in the figure indicates a refueling pump that feeds fuel from an underground tank to a refueling nozzle. and is connected to one end of the refueling hose 3. A flow rate pulse transmitter 4 is attached to the flow meter 2, and a signal from the flow rate pulse transmitter 4 is converted by a control device 5 into a refueling amount and displayed on a display 6.

Reference numeral 7 denotes a positive pressure generating means, and in this embodiment, an ejector 8 is used. The ejector 8 has a compressed air inlet connected to a compressed air source (not shown) via a solenoid valve 9, a discharge port opened to the atmosphere via a solenoid valve 10, and a suction port connected to a pipe via a sensor chamber 1. A pressure detector 14 is connected between the suction port of the ejector 8 and the sensor chamber 11, and is configured to detect the pressure in the pipe line 12. In the figure, reference numeral 18 indicates an alarm activated by a signal from the control device M5, and reference numeral 19 indicates a pump drive motor that drives the oil supply pump.

FIG. 2 shows the structure from the above-mentioned positive pressure generating means 7 to the gas sensor chamber 11, and shows the structure with reference numeral 8 in the figure.
is the ejector body, and the compressed air inlet 20 and outlet 2
1 are connected to solenoid valves 9 and 10, respectively. These solenoid valves 9.1° have valve bodies 9a, 10a with springs 9b,
10b (energized from this, and solenoid 9c,
When 10c is excited, the valve bodies 9a, 10a are moved against the springs 9b, 10b. A pressure sensor 14 disposed in the middle of the pipe line 12 has a case separated into two chambers 14t) and 14c by a diaphragm 14a.
(It is divided into two parts, and one of the chambers 14b is connected to the conduit through an opening 14d.

A positive pressure switch means 26 for detecting the displacement M of the diaphragm 14a is installed in the case, and when the conduit 12 is under negative pressure, the daisephragm 14a comes into contact with the switch means 26 to activate it. aS, has been done. The sensor chamber 11 accommodates a gas sensor 15 that outputs a signal in response to hydrocarbon gas constituting the vapor.

FIG. 3 shows an embodiment of a refueling nozzle,
Reference numeral 3o in the figure is the main body body housing the main valve 3, which is connected to the oil supply pump 2 through the hose 3 at one end, and the other
4 is connected to a nozzle pipe 32. The main valve 31 is connected to a lever 34 that allows a latch 33 to maintain the valve open state.

Further, the lever 34 is provided with an operating section 37 that opens and closes a stop valve 36 connected to a vapor suction pipe 35, which will be described later, so as to be constantly activated by a spring 38.

Reference numeral 35 designates the aforementioned vapor suction pipe, one end of which is disposed along the positive pressure generating means 7 through the conduit 12, and the other end is disposed along the nozzle pipe 32.

Reference numeral 36 designates the above-mentioned stop valve, which is configured so that when refueling is stopped, the valve body protrudes toward the opening side to close the pipe line, and when refueling is performed, the valve is opened. Reference numeral 40 denotes a pipe that bypasses the stop valve 361Fr, and a check valve 41 that opens when the pressure on the pipe line 12 side becomes positive pressure is provided here.

Next, the operation of the apparatus configured as described above will be explained based on the flowchart shown in FIG.

When the refueling nozzle 13 is removed from the nozzle hook 16 and the nozzle switch 17 is turned on (step I), the control device 5
In this case, the display 6 returns to zero, and the valve 9 of the compressed air supply source is excited and opened (step RO). As a result, compressed air flows into the ejector 8 and negative pressure is generated at the suction port 23. Become.

On the other hand, in this state, since the lever 34 is lowered, the valve 36 communicating with the vapor suction pipe 35 is in a closed state. Therefore, a strong positive pressure acts on the conduit 12, and the diaphragm 14a of the pressure sensor 14 is drawn toward the negative pressure switch means 26, causing the positive pressure switch means 26 to output a signal. Become (step ha). In this state, when the nozzle pipe 32 is inserted into the automobile fuel tank and the refueling lever 34 is pulled up, the valve 35 of the vapor suction pipe 35 is opened, and the suction pipe 35 communicates with the automobile fuel tank. 2 pressure decreases. As a result, the diaphragm 14a of the pressure sensor 14 returns to its original position and the signal from the positive pressure switch means 26 disappears (Step 2).

In this state, the ejector 8 causes the vapor in the automobile fuel tank to flow into the sensor chamber 1 through the suction pipe 35 and the conduit 12.

When a predetermined time TI, for example, 3 seconds has elapsed since the signal from the switch means 26 disappeared (Step E), the control device 5 receives the signal from the gas sensor 15 and controls the fuel oil in the automobile fuel tank. Determine the type (go to step). At this point, the vapor in the automobile fuel tank has definitely reached the gas sensor 5, so it is possible to reliably determine the fuel oil contained in the automobile fuel tank. It is in a state of

If the result of the determination is that the oil type matches the pre-registered oil type (step 1), the compressed air supply main valve 9 of the ejector 8 is demagnetized and closed, the vapor suction is terminated, and the refueling motor is started. 9 (step 1).

When the amount of refueling reaches a predetermined value and the refueling lever 34 is lowered, the main valve 31 closes to stop discharging fuel oil, and at the same time, the valve 36 of the vapor suction pipe is closed.

When the refueling nozzle 13 is set on the nozzle hook 16 and the nozzle switch 17 is turned OFF (Step 1), the control device 5 turns off the refueling pump drive motor 11 (Step 1), and then turns off the compressed air supply main valve of the ejector 8. At the same time, the well 10 on the discharge side is excited and closed (Step O). Thereby, the compressed air flows into the vapor suction pipe 35 from the suction port 23, opens the check valve 41, and flows out from the tip to the atmosphere. In this process, the vapor remaining in the sensor chamber 11 is discharged, and the gas sensor 1
5 will be scavenged with fresh air. In this way, when the predetermined time T2, for example 5 seconds, has elapsed (step wa), the compressed air supply source valve 9 of the ejector 8 is closed, and the discharge side valve 10 is opened (step wa), and the next Prepare for refueling.

On the other hand, if the oil type is different from the pre-registered oil type in step (G), the control device 5 closes the compressed air supply valve 9 of the ejector 8 and supplies the compressed air to the gas sensor chamber 11. In addition to preventing the inflow of vapor, alarm 1
8 to prompt the operator to confirm the oil type (Step YO).

In this way, the refueling nozzle is set on the nozzle hook 16 without performing refueling, and the nozzle switch 17 is turned OFF.
When the temperature reaches (step), the operation of the alarm 18 is stopped (step), the compressed air supply main valve 9 of the ejector 8 is opened, and the well 10 on the discharge side is closed (
Step e), as a result, the compressed air flows from the suction port 23 of the ejector 8 into the suction pipe 35, and the check valve 41
Open it and discharge it into the atmosphere from the tip. In this process, the vapor remaining in the gas sensor chamber 11 is discharged. In this manner, when the predetermined time T2, for example 5 seconds, has elapsed (step wa), the compressed air supply main valve 9Iv of the ejector 8 is closed, and the well 10 on the discharge side is opened (step wa).

On the other hand, if the refueling nozzle] 3 is mistakenly inserted when the fuel amount in the automobile fuel tank is full, the tip of the vapor suction pipe 35 will be immersed in the fuel oil. When the refueling lever 34 is pulled in this state, the suction pipe 35 will suck up fuel oil, so the suction load will be greater than that of vapor, and the suction pipe 35 will immediately become positive pressure. Therefore, the positive pressure switch means 26 is immediately turned on (step S).

The control device 15 closes the valve 10 on the discharge side of the ejector 8, pressurizes the suction pipe 12, and discharges the sucked fuel oil, while activating the alarm 18 to alert the operator (step 1). ). When the time required for all of the fuel oil to be discharged in this way, for example 2 seconds, has elapsed (Step N), the compressed air supply valve 9 of the ejector 8 is closed (Step S), and the gas sensor 75
It is possible to prevent accidents such as being immersed in fuel oil.

When the refueling nozzle 13 is pulled out from the automobile fuel tank and the nozzle switch 16 becomes ○ (step), the control device 5 stops the operation of the alarm 18 (step). The source valve 9 is opened and the well 10 on the discharge side is closed (Step O).As a result, compressed air flows from the suction port 23 into the vapor suction pipe 35, and the check valve 41 is opened to be discharged from the tip.

In this way, when the predetermined time T2, for example 5 seconds, has elapsed (step W), the compressed air supply source valve 9 of the ejector 8 is closed, and the valve on the discharge port side is opened (step W). ).

In this embodiment, the ejector supplies positive pressure to the vapor suction pipe, but it is also possible to connect the vapor suction pipe to the inlet and discharge port of the exhaust pump via a switching valve. It is clear that similar effects can be achieved.

(Effects of the Invention) As explained above, in the present invention, a refueling pump and a flow rate measuring means are provided in a pipe connected to an oil storage tank, a refueling mechanism having a refueling nozzle at the tip, and a pipe connected to a vapor suction means. A pipe equipped with a gas sensor in the middle of the pipe, with means for determining the type of oil based on the output of the gas sensor after a predetermined period of time has elapsed since the pipe returned from negative pressure to atmospheric pressure. Since the oil type determination function is provided, the oil type can be determined at the time when the vapor reaches the gas sensor, and the oil type can be determined with high reliability.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an apparatus showing an embodiment of the present invention, Fig. 2 is a diagram showing the structure from a positive pressure generating means to a gas sensor chamber, and Fig. 3 is a diagram showing an embodiment of a refueling nozzle. The main part sectional view and FIG. 4 are flowcharts showing the operation of the above device. 1... Oil supply pump 2... Flow meter 3...
・Refueling hose 4...Flow rate pulse transmitter 5...
...Control unit M6...Display device 7...Positive pressure generation means 8...Ejector 9...Compressed air supply side valve 10...Discharge side valve 11... Gas sensor chamber 12...Pipeline 14...Pressure sensor 15...Gas sensor 17...Nozzle switch 26...Positive pressure switch means 31...Main valve 34... ...Refueling lever 35
...Vapor suction pipe 36...Valve 40...Bypass pipe 4
1...Check valve

Claims (1)

[Claims] A fuel pump and a flow rate measuring means are provided in a pipe connected to a fuel storage tank, a fuel supply mechanism is equipped with a fuel nozzle at the tip, and a gas sensor is provided in the middle of the pipe connected to a vapor suction means. A refueling device equipped with an oil type determination function, comprising means for determining the oil type based on the output of the gas sensor after a predetermined time has elapsed from the time when the pipe line returns from negative pressure to atmospheric pressure.