JPS58128426A - Fuel feeder for engine - Google Patents

Abstract

PURPOSE:To dispense with a conventional fuel pressure control valve, by using the output of a fuel detector and the frequency output of a vortex flow meter which detects the quantity of intake air, to control the degree of opening of a fuel escape valve so that the ratio of the quantity of intake air to that of fuel is equalized to a prescribed value. CONSTITUTION:When an engine is working, the quantity of intake air and that of fuel are found out by a vortex flow meter 4 and a fuel detector 17, respectively, to regulate the drive of a fuel injection solenoid valve 5 by an electronic controller 19 through a driver 11 synchronously with the frequency output of the vortex flow meter. The quantity of fuel injected through the solenoid valve 5 is controlled to be equal to a value calculated by the controller 19 on the basis of the outputs of the vortex flow meter 4, an intake air temperature detector 8, an oxygen concentration detector 10 and the fuel detector 17. The degree of opening of a fuel escape valve 18 is controlled depending on the calculated value. For example, when the fuel quantity is larger than the calculated value, the degree of opening of the fuel escape valve is heightened to increase fuel, which is returned from a pipe 16 to a fuel tank 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply system for an automobile engine, and in particular, the intake air amount of the engine is detected by a vortex flowmeter, and the system is driven for a certain period of time in synchronization with the frequency output of the vortex flowmeter. and a solenoid valve that injects and supplies fuel.

a fuel detector that detects the fuel that is injected and supplied by the solenoid valve; a fuel pump that pumps the fuel to the solenoid valve;
It is equipped with a fuel relief valve that returns a portion of this pressure-fed fuel to the fuel tank, and by inputting the frequency output of the vortex flowmeter and the output of the fuel detector, the ratio of the amount of air sucked into the engine to the furnace fuel softness is determined. The present invention relates to a fuel supply system for an engine equipped with an electronic control device that controls whether or not the fuel relief valve opens to a desired value.

In the conventional sub-control fuel supply system of this type of automobile engine, the pressure of fuel supplied to the fuel injection solenoid valve is kept constant by a fuel pressure axis regulating valve composed of a diaphragm. If the above-mentioned diaphragm breaks, there is a danger that the fuel will leak outside, and the above-mentioned Forest Service Senrikicho still remains!
Since the degree of pressure adjustment of the valve directly affects the purity of the amount of fuel supplied to the engine, the precision of the pressure adjustment described above is required to be highly sophisticated and is expensive in products that are produced in large numbers such as self-help vehicles. There is a drawback.

The present invention provides a fuel supply device for an engine that eliminates the above-mentioned drawbacks and at the same time can accurately control the ratio of the amount of air to the amount of fuel taken into the engine. Explain some examples of XX.

In the figure, ... is the engine, and the intake pipe of the engine is shown (3).
is a throttle valve linked to an automobile's accelerator pedal, (
41 is a vortex flow meter that detects the amount of intake air taken into the engine 11+, (6) is the throttle valve (a magnetic valve '1 for fuel injection provided on the upstream side of 31), (6) is an air cleaner, (71ti air cleaner element (P paper)
, +81 is the intake air temperature detector, (9) is the engine 1 above.
No. 11 exhaust pipe, (1a is an oxygen 14 degree detector *H arranged in the above exhaust pipe (θ) and detects the oxygen concentration in the exhaust gas) is synchronized with the frequency output of the above disaster flow ambiguity meter (4).

A solenoid valve drive device that opens the fuel injection solenoid valve 111 for a certain period of time, 11! The fuel tank is an electric fuel pump, the suction side of which is connected to the above-mentioned fuel tank via a pipe 1141, and the discharge side connected to the above-mentioned solenoid valve 16) via a pipe α4 from the fuel filter body. are doing. The amount of fuel supplied to the '1 magnetic valve f61K is detected by a fuel detector Qη. The pipe olIri branches in the middle and passes through the fuel tank 021 via the fuel relief extension i11.
is connected to. 4 is a one-child control device that controls the direct connection of the +m valve at the end of the fuel relief valve; the outputs of the vortex flowmeter f4), the intake air temperature detector (8), the oxygen concentration detector 11α, and the fuel detection QN+η and inputs the drive voltage of the fuel pump ttS, drives the fuel relief valve IJI so that the ratio of air and fuel taken into the engine il+ becomes a desired value, and part of the fuel flowing through the pipe 011 is driven. By controlling the amount of fuel returned to the solvent tank a, the amount of fuel supplied to the electromagnetic valve (6) is substantially adjusted.

The previous work of the device constructed as described above will be explained and explained.

When the engine il+ is started, the intake air is transferred to air cleaner 6.
) is introduced into the vortex flowmeter 141K, and the amount of air is detected. The air is dried and taken into the engine III through the intake pipe C21. On the other hand, the fuel in the fuel tank a4 is fed to the fuel pump.
Yoshivibe (Solenoid valve ill and fuel release from I):
It is pumped to PaS.

Is the amount of fuel pumped to the above solenoid valve (61) detected by the fuel detector?
) is detected. The solenoid valve 1fi+ is driven for a certain period of time by the IE solenoid valve drive device (II) K in synchronization with the frequency output of the vortex flowmeter (4) corresponding to the intake air amount, and the fuel pumped under pressure is supplied to the above. The amount of fuel injected and supplied is determined by the vortex flow meter (4),
@ Large air temperature sensor +81 , , Oxygen concentration detector Above fuel vent *1 + Shizuku open -F? 'Friends are controlled and regulated. For example, if the amount of fuel that is injected and supplied is larger than that of Tokohiro, the amount of fuel that is returned from the pipe to the fuel tank will be increased if the amount of fuel that is injected is larger than the amount of fuel that is injected into the fuel tank. Then, the amount of fuel supplied from the pipe elG to the electromagnetic valve 1 (6) is reduced accordingly.If the amount of fuel injected and supplied is small, the fuel relief valve a is closed and the above-mentioned It is controlled by the electronic control unit to increase the amount of fuel supplied to the E!-/11.

On the other hand, in the case where the driving voltage of fuel pump +11 drops significantly (1), for example, when #4 starts opening at 1:00 pm in cold weather, the rotational speed of fuel pump OS (b) decreases and the fuel is pumped to pipe (I4). Since the amount of fuel decreases significantly, until 4- starts, the degree of opening of the fuel relief valve end is controlled in response to the drive electronics of the fuel pump α field or the rotation speed of I01 to reduce the amount of fuel pumped. Prevent the decline.

As described above, the present invention includes a vortex flow meter that detects the intake air amount by generating an output with a frequency corresponding to the vortex velocity according to the intake air amount of the engine, and a vortex flow meter that is synchronized with the frequency output of this flow meter.
A fuel injection solenoid valve that is driven for a certain period of time to supply fuel to the engine, a fuel detector that detects the amount of fuel supplied, and a fuel pump that pumps the fuel from the solenoid valve.

The furnace is equipped with a reactor that pumps a portion of the fuel into the fuel tank, and inputs the frequency output of the vortex flow meter and the output of the fuel detector, and calculates the amount of air taken into the 4th section and the fuel Since it is equipped with an electronic control device that controls the flow rate of the above-mentioned material relief valve so that the ratio of the amount of fuel is maintained at a desired value, the fuel pressure regulating valve composed of a diaphragm as in conventional devices is no longer required. At the same time, the risk of fuel leakage due to breakage is eliminated, and the ratio of the air amount to the fuel amount, that is, the control arrangement of the air-fuel ratio is largely determined by the detection accuracy of the vortex flowmeter (41) and the fuel detection iαη, so the above-mentioned Solenoid valve 1151F
DJs should use cheaper products with less responsiveness than conventional ones.
It became Noh. On the other hand.

In the conventional device in which the solenoid valve (6) is driven in synchronization with the rotational speed of the side opening, the control range of the fuel relief well (dynamic range C) is approximately IF8, but as in this invention, the intake air amount is If the vortex flow meter (4) corresponding to There is an advantage that it can be lower depending on the range.

[Brief explanation of drawings]

The figure is a configuration diagram showing an embodiment of the present invention. In the figure, H1#'i engine, (!)ke suction pipe, (31ke throttle valve, I41#i vortex flow meter, f5)#i solenoid valve, I
11#- is the fuel pump, 1+η is the beverage detector, tt1
11d The kanji and kan are electronic control devices. Agent Shin Kuzuno −

Claims (1)

[Scope of Claims] ... A vortex flowmeter that detects the intake air amount by generating an output with a frequency corresponding to the vortex velocity according to the intake air amount of the engine;
A solenoid valve for fuel injection that is set to a frequency ratio of 3 to the flow rate meter and is driven for a certain period of time to supply the amount of fuel to the engine; electromagnetic"
It is equipped with a fuel pump that pumps fuel to the valve, and a fuel relief valve that returns the pumped fuel to the fuel tank, and inputs the frequency output of the vortex flow meter and the output of the fuel detector. The fuel supply system of the participating engine is equipped with an electronic control device that controls the degree of opening of the fuel relief valve so as to maintain the desired ratio between the amount of air and the ratio between Sakai and Satoshi Sakai. (2) When starting the #A valve, the degree of opening of the fuel relief valve is controlled in accordance with the rotational speed of the fuel pump or the driving pressure. Fuel supply device.