JPS58128446A - Fuel supply device for engine - Google Patents

Abstract

PURPOSE:To eliminate a conventionally used fuel pressure regulator valve, by delivering the outputs of an intake air detector and a fuel detector for controlling the opening degree of a fuel relief valve so that the ratio of the volume of intake air and the volume of fuel comes to have a predetermined value. CONSTITUTION:Upon engine operation, air sucked through an air cleaner 15 passes through an intake air pipe 2 and is introduced into an engine 1, while a piston 5 moves under venturi negative pressure in accordance with the volume of intake air at thus time so that fuel in a needle valve chamber 23 is sucked into the intake air pipe 2 through an adjusted fuel insjection gap between a needle valve 7 and an orifice 8. At this stage, the outputs of an intake air detector 14, an intake air temperature detector 17 and a fuel detector 24 are delivered to an electronic control device 26 for carrying out a series of calculations. The volume of fuel is adjusted by controlling the valve opening degree of a fuel relief valve 25 so that the volume of fuel takes a predetermined value obtained by the calculations, thereby the air/fule ratio is maintained at a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply system for a motor vehicle, particularly a fuel control valve that continuously changes the amount of fuel flowing in accordance with the amount of intake air of an engine. An intake air detector and a fuel detector that detect the amount of air and fuel, a fuel pump that pumps the fuel, and a fuel pump that pumps the fuel into the fuel tank.
An engine equipped with a fuel relief valve that returns the fuel, and a control device that controls the opening of the fuel relief valve so that the ratio between the amount of air supplied to the engine VCQ and the amount of air supplied to the engine remains at a desired value. The present invention relates to a fuel supply device.

A conventional electronically controlled fuel supply system for this type of engine for a cutting wheel employs a system in which fuel is intermittently pulsed and supplied to the engine using a fuel injection l' valve. In this system, fuel is intermittently supplied to the engine's trachea in four periods as the engine rotates. However, since the incoming air is continuously taken in through the intake pipe TIC, the air-fuel mixture and atomization are mixed and the air-fuel ratio is not uniform, which tends to make combustion unstable. ing. Further, the pressure of the fuel supplied to the fuel injection solenoid valve 1C is kept constant by a pressure regulating valve comprised of a diaphragm. Therefore, if the diaphragm ruptures, there is a risk that the FiF fuel will flow out to the outside, and the pressure adjustment accuracy of the fuel pressure regulating valve will directly affect the accuracy of the amount of fuel supplied to the engine. Spirit f! tIIi It has the disadvantage of being expensive in products that require high quality and are produced in large quantities, such as for white goods vehicles.

This invention eliminates the above-mentioned drawbacks and precisely controls the ratio of the amount of air and fuel taken into one engine.

Furthermore, the present invention provides a link supply device for an engine that continuously supplies fuel.

An embodiment of the present invention shown in the drawings will be described below.

In the diagram, 1! ) engine, (! 1 intake pipe, 131 is a throttle valve linked to the accelerator pedal of an automobile, (4) is the fuel amount - valve body, (5) is a piston, (B) is a spring.

(7) is a needle l-valve fixed to the tip of the piston (6), and (8) is an orifice corresponding to the needle i-valve (1) for restricting the flow rate of fuel.

(9LFi) This is a venturi pressure introduction hole provided in the above-mentioned piston t6, and is the tip of the above-mentioned piston (6) もI!
I! , - and the venturi part (the constricted part of the intake air passage) formed by the mounting part of the orifice (8) is introduced into the inner chamber (11) of the piston (!I). The upstream side pressure is introduced into the outer chamber 111 of the piston (5).Therefore, the piston f61 is inserted into the inner chamber (11). It operates in the direction of the arrow partly due to the power generated by the pressure difference between the pressure and the pressure in the outer chamber and the reaction force of the spring (6).

The driving force due to the differential pressure changes in accordance with the amount of intake air flowing through a portion of the venturi.

The above-mentioned nutrient control valve composed of the piston (51, spring (61), needle valve (7), orifice (8) 1, etc. has the same operating principle as the structure of a conventionally known variable venturi carburetor. It is based on

Detection of intake air detected by Karman vortex flow meter,
tt*h air cleaner, Ql#i air cleaner Niremen) (P paper), r1 is the intake air type detector.

(lII is a fuel tank, O1#i is an electric fuel pump, its suction side is connected to the above fuel tank by a pipe, and its discharge side is connected to a pipe from the mortar filter (foundation).
It is connected to the needle chamber (2) via.

The amount of fuel supplied to the above needle valve chamber is determined by fuel detection V#
Detected in (goods). The pipe branches off in the middle and is connected to the fuel tank via a fuel relief valve.

This is a magnetic control device that controls the opening of the above-mentioned fuel relief valve, and detects the above-mentioned intake air! 1041. Input the intake air temperature detection value η, the output of the fuel detection @ 1241, and the drive voltage of the solvent pump 4, and set the above-mentioned feed release so that the ratio of the air taken into the machine 14111K to the smoke powder becomes the desired ratio. The needle valve chamber 4 is substantially moved from the needle valve chamber 4 to the needle + by controlling a valve which directs a portion of the endangered fuel from the pipe into the connecting tank member.
The amount of fuel to be ejected is adjusted to 1M through the gap between 1 and Orice (8).

The operation of the apparatus configured as above will be explained.

When the engine 11+t+ is started, the intake air is introduced from the air cleaner to the intake air detection II (14) and the amount of air is detected.Then, it passes through the intake pipe (!1) to the engine 11M.
The air is sucked into the piston (6) due to the pressure generated when the intake air flows through a part of the nine venturi formed between the tip wall of the piston (5) and the mounting part of the orifice (8).
1 moves in accordance with the intake air amount of upper 1, and the above piston (6
) and the above oriice (8)
It operates so as to change the fuel injection gap W formed between the gap C and the amount of fuel injected from the fuel injection gap C in approximately proportion to the amount of intake air. The injected fuel is pumped from the fuel tank TJ1 into the needle valve chamber by the fuel pump 4. The injected fuel amount #- is detected by fuel detection #241. The fuel pumped by the fuel pump 111 is also pumped to the internal valve.

Then, the fuel is injected and supplied to the engine 1!1 from the fuel injection station, and the intake air is detected 111141. The input air temperature detection signal aη and the outputs of the above-mentioned fuel detector clamp are input to the magnetic control device, which is calculated and controls the degree of opening of the fuel relief valve to the desired value. be adjusted. Due to the movement of the piston i11), the needle valve (7) is moved to a position commensurate with the amount of intake air, so the adjustment by the fuel relief valve (to) is accurately corrected to the desired value. For example, if the injection accuracy of the needle valve (7) is poor and the amount of fuel injected is greater than the desired value, the degree of opening of the school material relief valve (to) will be changed. becomes larger, and the amount of fuel returned from the pipe (to) to the solvent tank increases.Then, substantially, the fuel supplied from the pipe to the needle valve chamber (to), that is, to the engine (1), is increased. On the other hand, it reduces the amount of fuel injected.

If the amount of fuel injected is small, for example, if a spring 1B) with a slightly stronger drag force is used, the fuel relief valve is closed to increase the amount of fuel injected. Controlled by electronic control unit @. On the other hand, the driving voltage of the Confucian pump is extremely low.
Case 1: For example, when starting the engine in cold weather, the rotational speed of the fuel pump decreases and the amount of fuel pumped into the pipe decreases significantly. Until the pressure is restored, the degree of opening of the fuel relief valve is controlled in accordance with the drive voltage or rotational speed of the fuel pump 91 to prevent the amount of fuel transported across the ocean from decreasing.

As described above, the present invention provides a fuel control valve C need A that continuously changes the amount of fuel flowing in accordance with the intake air amount of the engine.
/''now) and the intake air detection I that detects the above intake air amount.
and a fuel detector that detects the amount of fuel flowing through the fuel control valve, a fuel pump that pumps smoke to the fuel control valve, and a fuel relief valve that returns the pumped fuel to the fuel tank, Input the output of the intake air 1 air detector and the output of the fuel detector, and adjust the degree of opening of the fuel relief valve so that the ratio of the amount of air to the amount of fuel taken into the ## valve remains at the desired value. Equipped with an electronic control device that controls the air flow, there is no need for a fuel pressure regulating valve consisting of a diaphragm like in conventional devices.The risk of leakage due to damage to the diaphragm is eliminated, and at the same time the ratio between the air volume and fuel volume is reduced. .

In other words, the 'III control accuracy of the air-fuel ratio is almost determined by the detection accuracy of the intake air detector and the fuel detector, so there is no need to mount or process the fuel control valve with high accuracy, and the fuel can be controlled with a simple configuration. It is possible to continuously inject and supply water with high precision.

[Brief explanation of drawings]

The figure is a groove diagram showing one embodiment of the present invention. In the figure, 11) is the engine, (!1 is the intake pipe, (3) is the throttle valve, 141 is the fuel control valve body, 1s) is the piston, (7) is the needle valve, and 1141 is the intrusion air detector. , S6 is the air cleaner, A is the fuel tank, A is the fuel pump, @4Fi fuel detector, @ is the fuel relief valve 1gs, and is the electronic control device. Agent Shin Kuzuno −

Claims (1)

[Scope of Claims] An il#charge system#□ valve that continuously changes the amount of fuel flowing in response to the amount of intake air in the il valve, an intake air detector that detects the amount of intake air; a fuel detector for detecting the amount of fuel flowing through the fuel control valve; a fuel pump for pumping fuel to the fuel control valve; and a fuel relief valve for returning the pumped fuel to the fuel tank; Input the output of the detector and the output of the above-mentioned detector. A fuel supply system for a nine-engine engine, comprising a control device for controlling the opening and closing of the fuel relief valve so that the ratio between the air amount and the fuel amount is the desired 1WJ. 121. The fuel supply system for an engine according to claim 1, wherein the degree of opening of the fuel relief valve is controlled in response to the rotational speed or drive voltage of the engine when the engine is started. 111. The fuel supply system for an engine according to claim 1, wherein the fuel amount m* is driven in response to the pressure of a part of a venturi in an intake pipe of the engine through which intake air flows.