JPS5968551A - Fuel supply device of engine - Google Patents

Abstract

PURPOSE:To discharge evaporated gasoline to a suction system of an engine so that air-fuel mixture does not become superrich, by separating the vaporized gasoline generated within a fuel duct from gasoline. CONSTITUTION:A reserving chamber 6 is provided at the highest part of a fuel oil duct 5. A fuel oil level is lowered by evaporated gasoline by entering into the reserving chamber 6 when percolation is generated within the fuel oil duct 5 and when an opening of a throttle valve is more than a fixed level when the evaporated gasoline is collected until a fuel oil level detector 11 exposes above the fuel oil level an opening and closing valve 9 is opened and closed as an electric current of an electric power source 14 is applied to a solenoid 10 and the vaporized gasoline in the reserving chamber 6 is discharged to a suction system 2 through discharge piping 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for discharging air bubbles into the engine intake system without passing through the control unit when air bubbles are generated in the fuel supply path that connects the control unit that supplies fuel to the intake path and the fuel pump. This invention relates to a fuel supply device equipped with a folding mechanism.

For example, in a fuel supply system for an automobile engine equipped with a carburetor in which the fuel supplied to the intake passage is controlled by a float-type control unit, the fuel in the oil supply passage from the fuel pump to the float chamber may overheat and generate steam. , bubbles of vaporized gasoline push open the float valve and enter the float chamber with the liquid gasoline, causing an overflow.

As a countermeasure against such percolation, in addition to designing and arranging the fuel system so that it is not affected by exhaust heat and engine heat as much as possible, we also adopted a ventilation system that releases the vaporized gasoline in the float chamber to the outside or inside of the carburetor. However, the external ventilation method causes air pollution, and the internal ventilation method has the problem of making the air-fuel mixture supplied to the engine too rich.

The present invention was made with the object of providing a fuel supply system that does not cause the above-mentioned problems by separating vaporized gasoline generated in the fuel supply path and releasing it into the intake system of an engine to prevent the mixture from becoming too rich. It is what was done.

In order to achieve this object, the fuel supply device according to the present invention includes a reservoir chamber provided in a fuel supply passage connecting a fuel pump and a control unit for supplying fuel to an intake passage, and a fuel supply device installed in this reservoir chamber. an oil level detector, a discharge pipe connecting the intake system of the engine and the reservoir chamber, and when the oil level detector installed in the discharge pipe detects that a certain amount of vaporized gasoline has accumulated in the reservoir chamber; The invention is characterized by comprising an opening/closing valve (6) so as to be opened, and in addition to the above-mentioned structure, it is further provided with an opening degree detector of the throttle valve in the intake passage, so that when a certain amount of steam gasoline accumulates in the reservoir chamber and the throttle valve opens. It is characterized by a structure in which the on-off valve is opened when the temperature is above a certain level.

Hereinafter, specific examples of the present invention will be explained based on the drawings. In FIGS. 1 and 2, 1 is an air cleaner, 2 is an intake system from the air cleaner 1 to an engine (not shown), and 3 is a fuel tank.

4 is a fuel pump, 5 is an oil supply path, 6 is a reservoir chamber provided at the highest point of the oil supply path 5, 7 is a discharge pipe connecting the upper part of the reservoir chamber 6 and the intake system 2, and 8 is provided in the discharge pipe 7. 9 is an on-off valve for the discharge pipe 7; 10 is a solenoid for driving the on-off valve; 1
1 is an oil level detector consisting of an electrode type liquid level gauge, 12 is a throttle valve 1
3, the power supply 14. Switch that closes when the engine is running 15. Opening degree detector 12° Oil level detector 11
．． The solenoid [O] is provided in series with the electric circuit [6], and the fuel supply to the intake passage [7] shown in Fig. 1 has a throttle valve 13 is controlled by the float-type control unit [8]. An example in which the present invention is applied to a fuel supply device is shown, in which a discharge pipe 7 opens into the interior of an air cleaner 1 forming a part of an intake line 2.

The oil supply path 5 is connected to a float chamber 19.

Gasoline supplied by the fuel pump 4 enters the float chamber 19 through the reservoir chamber 6, and the reservoir chamber 6 is installed near the float chamber 19 and is normally almost full of gasoline. When a bar collide occurs in the fuel supply path 5, steam gasoline enters the reservoir chamber 6 and lowers the oil level, and when the gasoline vapor accumulates at a constant level, that is, until the oil level detector 11 is exposed above the oil level. , throttle valve 6] When the opening degree of valve 3 is above a certain level, current from power source 14 is supplied to solenoid IO, and valve 9 opens and closes.
Let the valve open.

The vaporized gasoline in the reservoir chamber 6 is discharged into the intake system 2 via the discharge pipe 7. When the oil level rises to above the oil level detector 1, the on-off valve 9 closes and the release of steam gasoline ends.

FIG. 2 shows an example in which the present invention is applied to a fuel supply device equipped with a fuel injection device 22 that controls fuel supplied to the upstream side of the throttle box 13 of the intake passage 20 by an electromagnetic control section 21, and a discharge pipe. 7 opens into an intake pipe 23 forming a part of the intake system 2, and the oil supply path 5 is connected to an injection valve 24.

Gasoline supplied by the fuel pump 4 passes through a reservoir chamber 6, enters an injection valve 24, and is injected from a nozzle 25. The reservoir chamber 6 has a function of absorbing pressure pulsations of the fuel pump 4.

The vaporized gasoline that is generated and enters the reservoir chamber 6 is discharged into the intake system 2 at the same point as in the actual case.

Note that when the opening detector 12 is not used, steam gasoline is released regardless of the engine operating state, so either a throttle 8 is provided in the discharge pipe 7 as in the illustrated embodiment, or the diameter of the discharge pipe 7 itself is made small. . Consideration is given to releasing the mixture little by little by reducing the opening degree of the on-off valve 9 to create a throttling effect, so as not to cause the mixture to become over-rich.

The valve opening detector 12 can be set to release steam gasoline at high loads, or can be set to release steam gasoline little by little as described above, which may also cause a drop in engine output due to an overrich mixture. I guess it's better to keep it that way. It goes without saying that the oil level detector 1 may be constructed of a float type switch, a semiconductor sensor, etc.

As described above, according to the present invention, when percolation occurs in the fuel supply passage that connects the fuel pump and the control unit for fuel supplied to the intake passage.

Since vapor gasoline is stored in a storage chamber and released into the intake system when it exceeds a certain amount, liquid gasoline is fed into the control section more than necessary and overflows. It would be possible to eliminate the inconvenience of the fuel supply to the intake passage being interrupted, or by restricting the amount of fuel released or configuring the fuel to be released when the throttle opening is above a certain level, it would be possible to eliminate the problem of fuel supply to the intake passage. This allows the engine to consume gasoline.

[Brief explanation of drawings]

FIGS. 1 and 2 are schematic longitudinal cross-sectional views showing different embodiments of the present invention. 2...Intake system, 4...Fuel pump, 5
・Old...Refueling route, 6...Storage room, 7...
・Discharge piping, 8... Throttle, 9... Open/close valve, l]... Oil level detector. 12...Opening degree detector, 13.Old...Aperture square, 1
8.21...Control unit. Agent Mutsumi Nozawa (

Claims (3)

[Claims] (1) A reservoir chamber provided in an oil supply passage connecting a fuel pump and a control unit for fuel supplied to the intake passage, and an oil level detector installed in this reservoir chamber. A discharge pipe connecting the intake system of the engine and the reservoir chamber, and an on-off valve provided in the discharge pipe that opens when the oil level detector detects that a certain amount of steam gasoline has accumulated in the reservoir. An engine fuel supply device characterized by comprising: (2) A reservoir chamber provided in an oil supply path that connects a control unit for fuel supplied to the intake path and the fuel pump, and an oil level detector installed in this reservoir chamber. A throttle valve opening detector provided in the intake passage, a curved surface detector installed in the reservoir chamber, a discharge pipe connecting the engine intake system and the reservoir chamber, and a discharge pipe provided in the discharge pipe. an on-off valve that operates to open when the oil level detector detects that a certain level or more of gasoline has accumulated in the reservoir chamber and the opening degree detector detects that the opening degree of the throttle cell is above a certain level; A fuel supply device for an engine, characterized by comprising: (3) The fuel supply device for an engine according to claim (]) or (2), wherein the discharge pipe is provided with a restriction.