JPH0784235B2 - Oil supply device with oil type determination function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is designed to automatically determine the type of fuel oil in an automobile tank by analyzing the fuel oil vapor accumulated in the automobile fuel tank. Regarding the liquid supply device.

(Prior Art) A refueling device configured to analyze fuel vapor in a vehicle fuel tank, so-called vapor, to automatically determine the type of fuel oil to be replenished is disclosed in JP-A-64-58697. In addition, a gas sensor is arranged in the middle of a pipeline for sucking vapor in the tank, and the type of fuel oil is determined when a signal from the gas sensor is output.

(Problems to be Solved by the Invention) However, when the vehicle fuel tank and the gas sensor are connected by a relatively long pipeline, that is, when the gas sensor is arranged on the main body of the fueling device, the vapor reaches the gas sensor. It takes a long time until the output of the gas sensor for determination is uncertain, and an oil type determination error may occur.

The present invention has been made in view of such a problem, and an object thereof is to provide a novel oil supply device capable of accurately determining an oil type by clarifying a point of time when a signal from a gas sensor is captured. Is to provide.

(Means for Solving the Problem) In order to solve such a problem, in the present invention, an oil supply mechanism including an oil supply pump, a flow rate measuring means, and an oil supply nozzle, a tip of the oil supply nozzle, and a negative pressure generating means. A gas sensor is connected to the vapor suction pipe to connect with, in an oil supply device having an oil type determination means for determining the oil type based on the output of the gas sensor, with the vapor suction pipe provided with a pressure detection means, When the time required for the vapor to reach the gas sensor elapses from the time when the pressure of the vapor suction pipe is changed from the negative pressure state to the atmospheric pressure state by the pressure detection means, the oil type determination means is the gas sensor. The oil type was determined based on the output of.

(Operation) Since the output of the gas sensor is taken and determined at a certain time from the time when the negative pressure returns to the atmospheric pressure, that is, when the vapor in the vehicle fuel tank reaches the gas sensor, The oil type can be determined with high reliability.

(Example) Therefore, the details of the present invention will be described below based on an illustrated example.

FIG. 1 shows an embodiment of an oil supply apparatus to which the present invention is applied. In the figure, reference numeral 1 is an oil supply pump for supplying fuel from an underground tank to an oil supply nozzle, and a flow meter 2 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 this is converted into an oil supply amount by the control device 5 and displayed on the display device 6.

Reference numeral 7 is a negative pressure generating means, and an ejector 8 is used in this embodiment. The ejector 8 has a compressed air inlet opening to the compressed air source (not shown) via the solenoid valve 9, a discharge opening to the atmosphere via the solenoid valve 10, and a suction opening via the sensor chamber 11 and a conduit 12 through the sensor chamber 11. It extends to the fueling nozzle 13. Ejector 8 suction port and sensor chamber
A pressure detector 14 is connected between 11 and is configured to detect the pressure in the conduit 12. In the figure, reference numeral 18 is an alarm device that is activated by a signal from the control device 5,
Reference numeral 19 denotes a pump drive motor that drives the oil supply pump 1.

FIG. 2 shows the gas sensor chamber from the negative pressure generating means 7 described above.
The structure up to 11 is indicated by reference numeral 8 in the figure.
Is an ejector body, and solenoid valves 9 and 10 are connected to the compressed air inflow port 20 and the discharge port 21, respectively. In these solenoid valves 9 and 10, the valve bodies 9a and 10a are biased by springs 9b and 10b, and when the solenoids 9c and 10c are excited, the valve bodies 9a and 10a are resisted against the springs 9b and 10b. Is configured to move. Pressure sensor 14 installed in the middle of the pipeline 12.
Holds the case in two chambers 14b, 14 with a diaphragm 14a.
It is divided into c and one room 14b is connected to the pipeline by an opening 14d. The case is provided with a negative pressure switch means 26 for detecting the deformed position of the diaphragm 14a, and is configured so that the diaphragm 14a abuts the switch means 26 to operate it when the pipe line 12 has a negative pressure. There is. The sensor chamber 11 contains a gas sensor 15 that outputs a signal in response to a hydrocarbon-based gas that constitutes the vapor.

FIG. 3 shows an embodiment of the fueling nozzle,
Reference numeral 30 in the drawing denotes a main body portion that houses the main valve 31, one end of which is connected to the oil supply pump 2 via the hose 3 and the other end of which is connected to a nozzle pipe 32. The main valve 31 is connected to a lever 34 capable of maintaining an open state by a latch 33.

Further, the lever 34 is provided with an operating portion 37 for opening and closing a stop valve 36 connected to a vapor suction pipe 35, which will be described later, so as to be constantly elastically contacted by a spring 38.

Reference numeral 35 is the vapor suction pipe described above, one end of which is extended by the pipe line 12 to the negative pressure generating means 7 and the other end of which is extended to the tip of the nozzle pipe 32.

Reference numeral 36 denotes the stop valve described above, which is configured to cause the valve element to project toward the opening side when the fuel supply is stopped to close the pipeline, and to open the valve when the liquid is supplied. Reference numeral 40 is a pipe that bypasses the stop valve 36, and is provided with a check valve 41 that opens when the pressure on the pipeline 12 side becomes positive.

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

Refueling nozzle 13 is removed from nozzle hook 16 and nozzle switch
When 17 is turned on (step a), the control device 5 restores the display 6 and energizes the valve 9 of the compressed air supply source to open it (step b). As a result, compressed air flows into the ejector 8 and a negative pressure is generated at the suction port 23.

On the other hand, in this state, since the lever 34 is lowered, the valve 36 communicating with the vapor suction pipe 35 is closed. Therefore, a strong negative pressure acts on the pipe line 12, the diaphragm 14a of the pressure sensor 14 is attracted to the side of the negative pressure switch means 26, and a signal is output from the negative pressure switch means 26. It becomes (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 36 of the vapor suction pipe 35 is opened and the suction pipe 35 communicates with the automobile fuel tank. The absolute value of negative pressure decreases. As a result, the diaphragm 14a of the pressure sensor 14 returns to its original position and the signal from the negative pressure switch means 26 disappears (step
D).

In this state, the negative pressure of the ejector 8 causes the vapor in the automobile fuel tank to flow into the sensor chamber 11 through the suction pipe 35 and the pipe line 12.

The control device 5 takes in the signal from the gas sensor 15 at a stage when a predetermined time T1, for example, 3 seconds has elapsed from the time when the signal of the switch means 26 disappeared (step E), and detects the fuel oil in the vehicle fuel tank. Determine the type (step
F). Of course, at this point in time, the vapor of the vehicle fuel tank has reached the gas sensor 15 without fail, so that the fuel oil contained in the vehicle fuel tank can be reliably determined.

If the result of determination is that the oil type matches the pre-registered oil type (step), the compressed air supply source valve 9 of the ejector 8 is demagnetized and closed, vapor suction is completed, and the oil supply motor 19 is activated. Allow (Step H).

When the refueling amount reaches a predetermined value and the refueling lever 34 is lowered,
The main valve 31 is closed and the discharge of fuel oil is stopped, 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), the control device 5
After turning off the fuel pump drive motor 19 (step
(E) The main valve 9 for supplying compressed air of the ejector 8 is excited and opened, and the valve 10 on the discharge side is excited and closed (step E). As a result, the compressed air flows into the vapor suction pipe 35 from the suction port 23, opens the check valve 41, and flows out to the atmosphere from the tip. In this process, the vapor remaining in the sensor chamber 11 is discharged, and the gas sensor 15 is scavenged with fresh air. 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 discharge side valve 10 is opened (step C), and the next Prepare for refueling.

On the other hand, when the oil type is different from the oil type registered in advance in step (g), the control device 5 closes the compressed air supply source valve 9 of the ejector 8 and vaporizes the gas sensor chamber 11. In addition to blocking the inflow of
To prompt the operator to confirm the oil type (step yo).

In this way, when the refueling nozzle is set on the nozzle hook 16 and the nozzle switch 17 is turned off without executing refueling (step), the operation of the alarm 18 is stopped (step), and the ejector 8 is operated. Open the compressed air supply source valve 9 and close the discharge side valve 10 (step
E). As a result, the compressed air is sucked into the suction port of the ejector 8.
It flows into the suction pipe 35 from 23, opens the check valve 41, and discharges from the tip to the atmosphere. In this process, the vapor remaining in the gas sensor chamber 11 is discharged. In this way, when a 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 discharge side valve 10 is opened (step C).

On the other hand, if the refueling nozzle 13 is mistakenly inserted when the fuel amount in the vehicle fuel tank is full, the tip of the vapor suction pipe 35 will be immersed in the fuel oil. Refueling lever in this state
When 34 is pulled, the suction pipe 35 sucks up the fuel oil, so the suction load becomes larger than that of the vapor and the suction pipe 35
Becomes negative pressure immediately. Therefore, the negative pressure switch means 26 is turned on immediately (step S).

The controller 5 closes the valve 10 on the discharge side of the ejector 8,
The suction pipe 12 is pressurized to discharge the sucked fuel oil, while the alarm device 18 is activated to alert the operator (steps). In this way, when the time T3 required to completely discharge the fuel oil, for example, 2 seconds has elapsed (step N), the compressed air supply source valve 9 of the ejector 8 is closed (step N). This makes it possible to prevent an accident such as the gas sensor 15 being immersed in fuel oil.

When the refueling nozzle 13 is pulled out from the vehicle fuel tank and the nozzle switch 16 is turned off (step starter), the alarm 18
Stop the operation of (step). Next, the controller 5 opens the compressed air supply source valve 9 of the ejector 8 and closes the discharge side valve 10 (step E). As a result, the compressed air flows into the vapor suction pipe 35 from the suction port 23, opens the check valve 41, and discharges it 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 10 on the discharge port side is opened (step S5).
F).

In this embodiment, the negative pressure and the positive pressure are supplied to the vapor suction pipe by the ejector, but the vapor suction pipe may be connected to the inflow port and the discharge port of the exhaust pump via the switching valve. It is clear that the same effect is achieved.

(Effects of the Invention) As described above, in the present invention, the refueling pump,
An oil type that determines the oil type based on the output of the gas sensor by connecting a gas sensor to the vapor suction pipe that connects the tip of the fuel nozzle and the negative pressure generating means, and the oil supply mechanism that includes the flow rate measurement means and the oil supply nozzle. In the oil supply device including the determination means, the vapor suction pipe is provided with a pressure detection means, and the vapor reaches the gas sensor from the time when the pressure of the vapor suction pipe is changed from the negative pressure state to the atmospheric pressure state by the pressure detection means. Since the oil type determination means determines the oil type based on the output of the gas sensor when the time required for the elapse, it is necessary to determine the oil type when the vapor reaches the gas sensor reliably. In addition, it is possible to judge the oil type with high reliability without performing the oil type judgment operation when the vapor suction is impossible due to the failure of the negative pressure generating means. It is possible. Further, when the nozzle is inserted into the fuel tank of the vehicle which is full, it is possible to detect the suction of the fuel oil and instruct the recovery procedure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an apparatus showing an embodiment of the present invention, FIG. 2 is a diagram showing a configuration from a negative pressure generating means to a gas sensor chamber, and FIG. FIG. 4 is a flow chart showing the operation of the above apparatus, and FIG. 1 ... Oil supply pump, 2 ... Flow meter 3 ... Oil supply hose, 4 ... Flow rate pulse transmitter 5 ... Control device, 6 ... Indicator 7 ... Negative pressure generating means, 8 ... Ejector 9 ... Compression Air supply valve 10 …… Discharge side valve, 11 …… Gas sensor chamber 12 …… Pipe, 14 …… Pressure sensor 15 …… Gas sensor, 17 …… Nozzle switch 26 …… Negative pressure switch means 31 …… Main Valve, 34 …… Refueling lever 35 …… Vapor suction pipe 36 …… Valve, 40 …… Bypass pipe 41 …… Check valve

Claims (1)

[Claims] 1. A gas sensor is connected to a fueling mechanism including a fuel pump, a flow rate measuring means, and a fuel nozzle, and a vapor suction pipe connecting a tip of the fuel nozzle and a negative pressure generating means, and an output of the gas sensor. In an oil supply device having an oil type determination means for determining the oil type based on the above, the pressure detection means is provided in the vapor suction pipe, and the pressure of the vapor suction pipe is changed from the negative pressure state to the atmospheric pressure by the pressure detection means. When the time required for the vapor to reach the gas sensor elapses from the time when the state changes, the oil type determination means determines the oil type based on the output of the gas sensor. Refueling device with functions.