JPS58135356A - Electronically controlled fuel injector for engine - Google Patents

Abstract

PURPOSE:To effectively correct even air-fuel ratios during high-land running period by correcting the dispersions of a vortex flow meter to detect the flow rate of intake air and also of fuel metering. CONSTITUTION:Fuel sent under pressure is injected into an air inlet pipe 3 syncyronously with the frequency output of a vortex flow meter 4. At the same time as current is supplied to a mobile coil 22 according to the output signals of an exhaust gas sensor 33, the output signals of a vortex flow meter 6 and a revolving number detector 31 are input, and the operating region of engine is judged. In such an electronic controller 34, air-fuel ratios are converted into fuel pressures by the output signals of the exhaust gas sensor 33 and controllably fed back to a nearly theoretical air-fuel ratio. The fuel pressure in the operation region of engine, where no feed-back control is made, is regulated and held at almost average value of the fuel pressure in the operation region where feed- back control is made, and thereby the dispersion in the amounts of fuel weighed can be corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronically controlled fuel injection system for an internal combustion engine for automobiles, and in particular to an electronically controlled fuel injection system for an internal combustion engine, in particular, a vortex flow rate h1 which conveniently utilizes the intake air type of the engine, and a vortex flow rate h1 that is synchronized with the frequency output of this vortex flow meter at a predetermined time. 1ha 1wd tl
U] A solenoid valve for fuel injection that supplies fuel to the engine, this candy, a fuel pressure control device that controls the fuel pressure supplied to the mi-valve, and the exhaust gas components of the above AT The air-fuel ratio of the engine is adjusted to approximately flj by changing the fuel pressure according to the output signal of the exhaust sensor.
Feedback control is applied to the air-fuel ratio of I theory, and the fuel pressure in the operating range of the engine where this feedback control is not performed is adjusted and maintained at approximately the average value of the fuel pressure in the operating range where feedback control (111) is performed. The above-mentioned vortex flow meter corrects the variation in fuel weight due to the above-mentioned fuel injection solenoid valve, and also automatically corrects the air-fuel ratio when atmospheric pressure changes such as when driving at high altitudes. The present invention provides an electronic control fuel injection system for an engine that has been developed.

As is well known, a vortex flowmeter produces an output at a frequency corresponding to a high velocity (vortex generation number) that is proportional to the body flow rate of the intake air to be measured. This method of injecting and supplying a constant amount of fuel to the engine in synchronization with the frequency output proportional to the intake air amount () makes it possible to inject fuel to follow sudden changes in the intake air amount when the engine accelerates. Therefore, the above-mentioned engine has the feature of having excellent acceleration performance.By the way, when the atmospheric pressure decreases as in I41 when driving at high altitude, or when the temperature of the above-mentioned intake air changes, the above-mentioned vortex flow , 1 meter output needs to be corrected according to the atmospheric pressure or temperature, so an atmospheric pressure detector and an intake air detector are required to detect the atmospheric pressure.

This invention maintains the air-fuel ratio of the engine at a predetermined value even without such an atmospheric pressure detector and an intake air detector.

An embodiment of the present invention not shown in the drawings will be described below.

In the figure, (1) is the engine, (2) is the throttle valve linked to the accelerator pedal of the moving vehicle, (3) is the intake pipe, and (4) is the detection of the amount of intake air taken into the engine (1). Whirlpool #L
The hoe meter (5) is a solenoid valve for fuel injection, which injects the pressure-fed fuel into the intake pipe (3) in synchronization with the frequency output of the vortex flow meter (4). (6) is the above solenoid valve (5)
) for a predetermined period of time in synchronization with the above frequency output! , magnetic valve drive device fi, (7) is an air cleaner, (8) is a first cleaner element ('oM paper) housed in the air cleaner (7), (9) is a fuel tank, (11 is a fuel pump) Its suction side is connected to the fuel tank (9) by a vibrator 0υ. (12 is the fuel pump 0(j
The vibrator 02 connected to the discharge side of the fuel pressure control device is a fuel pressure control device. 04) is the main body case of the fuel pressure adjustment chamber*, O'Wl, and constitutes the fuel 1 pressure adjustment chamber (14a) connected to the vibe Q-gong. This fuel pressure high 1 adjustment chamber (14a) is a 10-distribution fuel injection solenoid valve (5
It communicates with the OQ communicates with the air intake pipe (3) through the air pressure control unit (16a) of the fuel pressure control device (03). 081
is a spring, and ag) is a diaphragm, which partitions the fuel pressure adjustment chamber (14a) and the differential pressure adjustment chamber (16a). α)) is a pressure regulating valve, which is integrally attached to the diaphragm 09. Qυ is the motor case that is opened to the right of the main body case 041 above, (2)
is a moving coil, which together with a permanent magnet (2), a core and a yoke (7) constitutes a well-known linear motor. (4
) is a pressure control @10 which is installed in the main body case (+4) so as to be able to slide freely through the main body case (+4) while maintaining airtightness. It is drawn to move in the direction of the arrow as the iJ moving coil (2) moves. In addition, the above pressure control rod (
E) is hollow, and one end of it is connected to the pressure regulating valve -
and the pressure regulating chamber (14) together with the pressure regulating valve.
a) acts to control the fuel pressure in the - The mandai field is connected to the vibrator (2) via a telescopic bellows (c), and further communicates with the fuel tank (9).

G[j is a spring. 6υ is the rotation speed toilet of the engine (1), Z is the exhaust pipe, and 充 is the exhaust sensor that detects the exhaust gas components of the engine (1). Push out a narrow fuel ratio. The figure shows that stones and flow are supplied to the movable coil (2) in accordance with the output signal of the above-mentioned exhaust nancer, and at the same time, the output signal of the above-mentioned vortex flow meter (6) and the 1st number feeder 6υ is supplied. This is an electronic control device that inputs information and determines the operating range of the engine (1).

The operation of the apparatus configured as described above will now be described. Masu, m l! When I (1) starts, the intake air passes through the air cleaner (7).
The air enters the engine (4) and is detected by the vortex flowmeter (4) and introduced into the engine (1) from the intake pipe (3). The fuel in the fuel tank (9) is pressure-fed to the fuel pressure adjustment chamber (Ha) by the fuel pump OQ.When the pressure of the delivered fuel exceeds a predetermined value, the force applied to the diaphragm α increases, The tire flamm α cast moves in a direction that compresses the spring Q81 against the force of the spring θ~.

At this time, the pressure regulating valve is removed from the pressure control rod.

Then, the fuel under the pressure control rod overflows from the hollow part of the pressure control rod into the smoke tank (99) and the pressure adjustment '4 (1).
4a) Apply circular pressure. When the pressure decreases, the pressure regulating valve again comes into contact with the pressure control rod (a), and the hollow part is not opened. Such the above pressure, iI+! +l
The fuel pressure in the pressure adjustment chamber (14a) is maintained at a positive level by opening and closing the valve control rod. The regulated fuel is by 1
From the 0th clause, the fuel injection solenoid valve (5) is supplied with the intake air %l'
(3) Injected within. This fuel injection is based on the pressure in the intake chamber (3), and the above fuel concentration is eS.
In order to keep t constant, the pressure in the intake pipe (3) is guided to the differential pressure adjustment chamber (16a,), and the tire flamm (l!
It is acting on Jl. The above operation is similar to that of the conventional device. Upper ril:! MoN I+ @ shooting stone'6 ishaben (5
) is a stone, magnetic valve 1 [1tlt device M (61) drives Rr for a fixed time in synchronization with the frequency output of the vortex flow meter (4) and injects fuel.On the other hand, the output signal of the ffjl gas sensor The input ``Shinshi control signal 1 blood supply C'' supplies stones and streams corresponding to the above output signal to the movable coil (4), and this 'r
4=', tAi It is good. Accordingly, the pressure-reducing rod holder moves. As a result, the contact position of the pressure 9M valve regulator and the pressure regulator σ410 valve 1 changes, and the fuel pressure in the pressure adjustment chamber (14a) changes. In other words, the fuel injection pressure supplied to the fuel phase injection value valve (5) changes and the amount of fuel injected is controlled. This control is controlled by feedback control based on the output signal of the exhaust sensor so that the operating air-fuel ratio of the engine (υ) becomes approximately the stoichiometric air-fuel ratio.This feedback 8ill 1ffll
In the operating range of the engine (1) where the engine (1) is being operated, the atmosphere of the intake air flowing into the whirlpool gf (4) is substantially
Soil, temperature and the vortex flow meter (4) and fuel lI! Variations in the fuel needle due to the injection stone 5 solenoid valve (5) are corrected by changing the fuel pressure so that the operating air-fuel ratio becomes approximately the stoichiometric air-fuel ratio. Therefore, in the operating state where the feedback control is performed, is the fuel pressure determined by taking into account the fuel pressure + #1 weight variation, etc.? +ti corrected. - The current value supplied to the moving coil (A) necessary to adjust the fuel pressure in the continuous state is stored in the mechanical control device M (B). (1) becomes a high-speed operation region, and when the output signal of the above-mentioned eddy current correction (4) and the output signal of the same rotation speed detection 'a', 31) reach a predetermined value, the upper d self feed bank l 641 stops. Ru. and,
The operating air-fuel ratio in the operating range where such feedback control 1 is not performed is determined at a desired air-fuel ratio other than the stoichiometric air-fuel ratio. At this time, the fuel pressure was determined by the current value stored in the electronic side (i11 device C group) when the feedback control 1111 was being performed, and the current value stored in the C group of the electronic side (i11) was supplied to the movable coil (a), and the feedback control #J was being performed. The fuel pressure in the operating range is maintained at approximately the average (ul). That is, even in the high-speed operating range where the feedback control is not performed, variations in the fuel pressure are eliminated.

As described above, the present invention includes a vortex flowmeter for detecting the level of intake air of an engine, a fuel injection solenoid valve that is synchronized with the frequency output of the vortex flowmeter and is driven for a predetermined period of time to supply fuel to the engine, and City, the fuel pressure supplied to the maternal side? A fuel pressure control device for Id control and an exhaust sensor for detecting exhaust gas components of the engine are provided, and the air-fuel ratio of the engine is changed to the stoichiometric air-fuel ratio by changing the fuel pressure according to the output signal of the exhaust sensor. Feedback control is performed, and the fuel pressure in the operating range of the engine where this feedback control is not performed is adjusted and maintained at approximately the average value of the fuel pressure in the operating range where feedback opening side 1 is performed.
In all operating ranges of the above engine, the fluctuations in the fuel needle due to the flow meter and fuel injection solenoid valve are corrected.
Furthermore, even when the atmospheric pressure changes, such as when the vehicle is driving in a rural area, it is possible to manually extract the air-fuel ratio.

[Brief explanation of the drawing]

The figure is a block diagram showing one example of this invention. In the figure, (1) is the engine, (4) is the vortex revision, (5) is the fuel injection solenoid valve, (7) is the air cleaner, and QCI is fPN.
F + pump, Q near are fuel pressure control equipment, (phantom is exhaust sensor, (b) is electronically controlled electrical equipment.

Claims (1)

[Claims] a vortex flow meter that detects the intake air flow i1 by generating an output with a frequency corresponding to high speed according to the intake air flow weight of the engine; A fuel injection *i valve that supplies fuel to the engine, a fuel pump that pumps fuel to the solenoid valve, and a fuel pressure control device 1141 that controls the fuel pressure of the pumped fuel. , - is equipped with an exhaust sensor for detecting exhaust gas components of assembly machine W-1, and "-rIL! In the electronically controlled fuel injection system for the engine, the air-fuel ratio of the engine is feedback-controlled to approximately the stoichiometric air-fuel ratio by changing the air-fuel pressure according to the output ratio of the exhaust sensor. The fuel pressure in the operating range of the engine in which the feedback is not performed is adjusted to approximately the average value of the fuel pressure in the linked rail region in which the feedback is performed, and the engine is on standby. Child-controlled fuel injection system.