JPH04128194A - Fuel feeding device - Google Patents

Abstract

PURPOSE:To simplify a passage structure to switch negative pressure for vapor suction and positive pressure for vapor scavenging by a method wherein for a fuel feeding device which decided the type of fuel oil contained in an automobile fuel tank by deciding vapor concentration by a gas sensor, a sampling passage to a diaphragm pump for vapor sampling is specially designed. CONSTITUTION:For a first pump chamber 21, a 3-port 2-position switching valve is connected to a gas suction valve 24 through a gas suction pipe 31, and a gas suction valve 25 for a second pump chamber 22 is connected through a relief valve 33, and also, an air jetting out port 36 at a nozzle storage recessed part 35 is communicated with a gas discharge valve 26 through conduit pipe 34. For the second pump chamber 22, an air intake port 38 is communicated with the gas suction valve 25 through a filter 37, and also a gas discharge valve 27 is connected with the 3-port 2-position switching valve 32 through a gas discharge pipe 30. The switching valve 32 connects the conduit pipe 31 to a gas sensor 40 at (a) position, and connects the gas discharge valve 27 to the gas sensor 40 at (b) position, to scavenge the sampling passage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a fuel supply device that automatically determines the type of oil in an automobile fuel tank and permits refueling only when the type of oil is compatible.

(Prior Art) There are two types of automobiles: those that use gasoline as fuel and those that use diesel oil.If different fuels are used, the engine will be subject to severe aS.

For this reason, prior to refueling, the vapor in the car's fuel tank is drawn to a gas sensor to measure the vapor concentration, and based on this result, the type of oil in the fuel tank is determined and matches the type of oil in the refueling nozzle. A refueling device has been proposed that enables refueling only when
In such a device, an air source installed at a refueling station is connected to the refueling device by a pipe line, and air is supplied to a vacuum ejector in the main body of the refueling device to extract vapor. It is designed to generate negative pressure and compressed air for vapor exhaust.

For this reason, piping is required to guide air from an air source installed at the refueling station to the refueling device, which poses a problem of increased costs associated with piping work.

In order to eliminate such a gap M, an oil supply system using a positive displacement pump as shown in FIG. 9 as an air source and a negative pressure source has been proposed.

That is, the pump case A is divided into two pump chambers C and D by a diaphragm B, and each pump chamber C and D is provided with an intake valve E, F and an exhaust valve G, H, and the intake valves E and F are connected to each other, and the exhaust valve is connected to each other. Valves G and H were connected to each other and connected via a second M5 boat switching valve J to an air intake port K, a sampling flow path, and an air jet port M in a nozzle housing recess.

(Plot M to be solved by the invention) According to such a configuration, by operating the switching valve J, the sampling flow path is connected to the intake valves E and F of the pump, and the vapor in the automobile tank is removed. lead to gas sensor P,
When the fuel oil type determination is completed, operate the switching valve J to connect the air intake port K to the intake valves E and F of the pump, and the sampling flow path to the exhaust valves G and H of the pump. Song style i? 8m of paper in 8L can be aired, and the plumber can use air from the air source inside the station! Although it has the advantage of being unnecessary, is there a mechanism for switching the flow path? ! ! There is a problem that M 5-port valve J is required.

The present invention was made in view of these problems, and its purpose is to simplify the flow path structure for switching between negative pressure for vapor flow and positive pressure for vapor scavenging. A refueling device equipped with a new sanbrijig mechanism for determining oil type! Our goal is to provide the following.

(Means for Solving the Problems) In order to solve such problems, the present invention provides a fuel supply device that measures vapor concentration using a gas sensor and determines the type of fuel oil stored in an automobile fuel tank. , the vapor sampling means is a positive displacement pump in which a pump case with one diaphragm is divided into a first and a second pump chamber, and an intake valve and an exhaust valve are provided in the first and second pump chambers, respectively. , 1st. The intake valve of the second pump chamber is connected to the vapor suction/exhaust port of the refueling nozzle via the switching valve and the gas sensor, and the exhaust valve of the second pump chamber is connected to the vapor suction/exhaust port of the refueling nozzle via the switching valve. I made it.

(Operation of the invention) The negative pressure generated in the pump chamber of the droplet 1 acts on the vapor intake and exhaust port of the refueling nozzle through one flow path of the switching valve, and the vapor in the automobile fuel tank is sucked into the sampling flow path f. I will do it. Furthermore, when the switching valve is switched, the air discharged from the second pump chamber is discharged from the vapor intake/exhaust port via the other channel of the switching valve, and scavenges the gas sensor, the sampling channel, and the like. The air discharged from the first pump case is constantly discharged from the air outlet of the nozzle housing recess.

(English Embodiment) The details of the present invention will be explained below based on the illustrated English Embodiment.

FIG. 1 shows an embodiment of the present invention, in which reference numeral 1 denotes an oil supply pump, a flow meter 2 is connected to the discharge port,
It is communicated with a refueling nozzle 4 via a hose l. The flow meter 2 is provided with a flow rate pulse transmitter 5, and the flow rate pulse from now on is converted into a refueling amount by a control snowmaking device 6 and displayed on a display 7.

Reference numeral 10 denotes a diaphragm pump, which is a type of positive displacement pump, and is driven by a motor 17.

FIG. 2 shows an embodiment of a vapor sampling mechanism centered on the above-mentioned diaphragm pump,
The reference numeral 10 in the figure is a positive displacement pump using a diaphragm, and the pump case is divided into the first and second pump chambers 21 and 22.
A diaphragm 23 is provided so as to separate the pump chambers, and each pump chamber 21.22 is provided with an intake valve 24.25 and an exhaust valve 26.27. The diaphragm 23 is connected to one end of an external operating rod 29 via an elastic seal member 28, and is reciprocated by a reciprocating motor 11 connected to the other end of the operating rod 29.

The first pump chamber 21 is connected to an intake valve 24 via an intake pipe 31 to a 3-bot 2-position switching valve 32 and to an intake valve 25 of the second pump chamber 22 via a leaf well 33. The exhaust valve 26 is also connected to the air outlet 36 of the nozzle housing recess 35 via a conduit 341Fr. Second pump chamber 22
Air intake 038 to the intake valve 25 via the filter 37
The exhaust valve 27 is connected to a 3-point/2-position switching valve 32 via an exhaust pipe 30, and roughly both valves 25.2
A relief valve 39 is connected between 7 and 7.

This switching valve 32 normally moves to the 8th position, and when energized moves to b (i7a), and in the a position, the conduit 31
is connected to the gas sensor 4o, and in the sixth position, the exhaust valve 27 of the second pump chamber 22 is connected to the gas sensor 40.

41 is an air tube provided along the refueling hose, one end of which is connected to the gas sensor 4o, the other end of which is connected to the switching valve 43 that is linked to the nozzle lever 42 as shown in FIG. It is connected via a vapor suction pipe 44 to a vapor suction/exhaust port A6 near the opening of the nozzle tip 45.

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

Nozzle 4 is removed from the nozzle hook and nozzle switch 47
is turned ON (step I), the control device 6 returns the display 7 to zero and operates the motor 11 of the positive displacement pump 10 (step B), thereby causing the first pump chamber 21 to turn on.
Only the negative pressure generated in the gas sensor 4 passes through the intake pipe 31.
0, and the air tube 41. At this point, the nozzle lever 42 remains pulled down, so the switching valve 4
3 is in position a and closed, so a large negative pressure acts on the air tube 41, and the pressure switch 49 is turned on.
A signal is output (Step C).

In this state, when the tip 45 of the nozzle 4 is inserted into the fuel tank of the automobile and the nozzle lever 42 is pulled up, the main valve 48
is opened, and at the same time, the switching valve 43 is moved to position b in conjunction with the lever 42, and the sampling flow path is opened. As a result, the vapor in the fuel tank flows into the air tube 41 from the vapor intake/exhaust port 46, the pressure in the air tube 41 increases, and the pressure switch 49 becomes FF (step 2). The start of sampling is detected by a signal from switch 49.

The vapor in the automobile fuel tank is sucked into the positive displacement pump 10 and flows into the gas sensor 40, and the output from the gas sensor 40 increases with time. When the predetermined time ΔT1 has elapsed (step 1), the control device W6 receives the signal from the gas sensor 4o (goes to step).
Compare with predetermined concentration data for each fuel oil.

In other words, when the fuel oil is gasoline, the concentration of organic gas components in the fuel tank is high, so a signal indicating a high concentration is output from the gas sensor 4o (Fig. 6), and diesel oil has a higher boiling point than gasoline. Therefore, the concentration of organic gas components in the fuel tank is low, and the gas sensor 40 outputs a signal indicating the low concentration (■ in the figure).

As a result of this comparison, if it is clearly determined to be gasoline or light oil (Step 1), and the oil type matches the oil type registered in this refueling nozzle (Step 1), move the switching valve to the 321Frb position. 2 pump chamber 2
The air from the exhaust valve 27 of the positive displacement pump 20 is supplied to the air tube 41, and the fuel pump 1 is operated to start fueling (Step 1). It flows into the air tube 41 and into the vapor intake/exhaust port 046 of the nozzle 4, scavenges the sampling flow path, prevents deterioration of the gas sensor 40, and prevents fuel oil from flowing into the vapor intake/exhaust port 46 during refueling.

When the amount of refueling reaches a predetermined amount and the nozzle lever 42 is pulled down, the main valve 48 closes and refueling stops, and the switching valve 43 that moves to the lever 42 moves to the 8th position and connects to the check valve. be done.

When the nozzle 4 is returned to the nozzle hook and the nozzle switch 47 is turned OFF (step nu), the oil supply pump 1 is stopped and the positive displacement pump 101v is operated at high speed (step). The pump 10 continues to operate at high speed (step wo), and air flows from the exhaust valve 27 of the second pump chamber 22 to the vapor suction/exhaust port 46 of the nozzle tip 45, scavenging the sampling channel and cleaning the nozzle tip. The fuel oil adhering to the portion 45 is removed, and when a predetermined time ΔT2 has elapsed, the motor 11 is removed.
stops, and the switching valve 32 is switched (step wa).

On the other hand, if it is not possible to clearly determine whether the oil is gasoline or diesel oil as a result of the oil type determination (step 1), the switching valve 32 is switched, the exhaust pipe 30 is connected to the air tube 411, and the motor 11 of the positive displacement pump 10 is connected. Activate alarm 501Fr while driving at low speed (step force) to prompt confirmation of oil type.

In other words, if a small amount of gasoline remaining in the nozzle tip 45 during the previous refueling drips into the fuel tank of a light oil vehicle, the vapor concentration in the fuel tank will be higher than the light oil judgment level L, and the gun level judgment will occur. Since the gas concentration temporarily rises to a value lower than level L2, the gas sensor 40 outputs a signal at a level in the middle of the gas concentration of gasoline cars and diesel cars (Fig. 6 m).
will be output. Therefore, the control table H6 cannot be determined to be any type of oil.

When the nozzle 4 is returned to the nozzle hook and the nozzle switch 47 is turned off (step YO) by this notification that the oil type cannot be determined, the positive displacement pump 10j is operated at high speed (step YO).

In this embodiment, the pressure switch 49 detects the sampling start point when the nozzle lever 42 is pulled down, but as shown in FIG. It is clear that the same effect can be achieved even if the motor is connected to the power source via the current detector 51 and detected from changes in the load current of the motor 11.

That is, as shown in FIG. 8, when the nozzle is removed from the nozzle hook, the nozzle lever 42 remains pulled down and the switching valve 43 remains closed, so a large load is placed on the positive displacement pump 10. As a result, the load current of the motor 11 has become large (Fig. 8). In this state, when the nozzle tube tip 45 is inserted into the automobile fuel tank and the nozzle lever 42 is pulled up, the nozzle lever 42 In conjunction with this, the switching valve 43 opens and the sampling channel is opened.

As a result, vapor flows into the sampling channel from the vapor-class exhaust port 46, the load on the positive displacement pump 10 becomes smaller, and the load current on the motor 11 decreases by Δt (T
2) By detecting this current decrease with the current detector 51, it is possible to detect the time when the nozzle lever is pulled up, that is, the time when sampling starts.

(Effects of the Invention) As described above, in the present invention, the fuel supply device l that measures the vapor concentration using a gas sensor and determines the type of fuel oil stored in the automobile fuel tank, The means includes a positive displacement pump in which a pump case is divided into first and second pump chambers by a diaphragm, and an intake valve and an exhaust valve are provided in the first and second pump chambers, respectively; The intake valve of the pump chamber of M2 was connected to the vapor exhaust port of the refueling nozzle via the switching valve and the gas sensor, and the exhaust valve of the pump chamber of M2 was connected to the vapor intake and exhaust port of the refueling nozzle via the switching valve. The negative pressure generated in the second pump chamber and the air discharged from the second pump chamber can be switched and supplied to the sampling flow path using a simple and inexpensive 3-point/2-position solenoid valve. .

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a device showing one embodiment of the present invention, Fig. 2 is a pipe diagram showing the main part of the flow path configuration of the same device, and Fig. 3 is a diagram showing an embodiment of a refueling nozzle. 4 is a flowchart showing the operation of the above device, FIGS. 5 and 6 are timing diagrams showing the operation of the above device and a line diagram showing changes in gas sensor output, and FIG. 7 is a flowchart showing the operation of the above device. Fig. 8 is a diagram showing the load current of the motor that drives the positive displacement pump in the device shown in Fig. 7, and Fig. 9 is a diagram showing the main part of the main part of the system shown in Fig. 7. FIG. 3 is a flow path diagram showing a sampling flow path of the oil supply device of FIG. 1... Oil supply pump 2... Flow meter 3...
...Refueling hose 4...Refueling nozzle 5...
・Flow rate pulse transmitter 6...Control device 7...Display device 1o...Positive displacement pump] 1...
・Morph

Claims (1)

[Claims] In a refueling device that measures the vapor concentration using a gas sensor and determines the type of fuel oil stored in an automobile fuel tank, the vapor sampling means is divided into a pump case into a first and a second pump chamber by a diaphragm. At the same time, the first and second pump chambers each have an intake valve and an exhaust valve. A refueling device in which an exhaust valve of a second pump chamber is connected to a vapor suction/exhaust port of a refueling nozzle via a switching valve.