JPS5830423A - Fuel injection device for internal combustion engine - Google Patents

Abstract

PURPOSE:To continuously perform injection of fuel and eliminate unevenness of mixing between air and fuel further improve a response of injection control, by performing correction in accordance with a various condition of an internal combustion engine after calculating a required basic fuel quantity through an electronically arithmetic circuit. CONSTITUTION:A controller 6 calculates a required basic fuel quantity in accordance with a signal of an air quantity sensor 1. A basic injection quantity is magnified and corrected by various parameters from an intake air temperature sensor 9, water temperature sensor 8, throttle opening sensor 7 and air-fuel ratio sensor 10, and then a signal is fed to an actuator 3. The actuator 3 displaces a fuel injection valve 2 to continuously inject fuel. In this way, delay of mixing between fuel and intake air can be decreased to obtain a quick response with less unevenness of a mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection device for an electric internal combustion engine. .

Conventionally, solenoid valves have been used as a fuel injection method for internal combustion engines.
It is said that the fuel is supplied to the engine in intermittent pulses. In this system, fuel is intermittently supplied to the engine's intake pipe in synchronization with the rotation of the engine. However, the intake air has the disadvantage that the mixture and atomization of the air and fuel that are continuously drawn into the intake pipe tend to be uneven, and the combustion that makes the air-fuel ratio uniform tends to become unstable. At low engine speeds, the fuel injection interval is long and the response of fuel control to changes in engine conditions is also poor.

The present invention aims to solve the above-mentioned drawbacks by continuously injecting fuel, thereby eliminating uneven mixing of air and fuel and improving responsiveness. The purpose of the present invention is to provide a fuel injection device for engines.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings. No. im shows an embodiment of the fuel injection device for an internal combustion engine according to the present invention, in which (1) is an air amount sensor installed in the intake passage of the internal combustion engine, iz, and f for measuring the amount of intake air; (2) is a fuel control valve that controls the fuel injection amount, and has a single valve opening (flow surface) corresponding to the position of the valve body (2a).
(3) is an actuator that controls the position of the valve body (2a) L7 to monitor the valve opening of the fuel control valve (2), and (4) is a throttle valve that adjusts the amount of air-fuel mixture in the internal combustion engine. , (5) is an internal combustion engine, and (6) is a side consisting of an electronic calculation circuit that electronically calculates the basic fuel amount based on the output of the air amount sensor (1) and performs correction calculations based on various parameters of the engine to be described later. (7) is the throttle valve (1 to 1) that is linked to the throttle valve (4) → no, (8) is the water temperature sensor that detects the cooling water temperature of the internal combustion engine → no, (9) is the suction Temperature (1)
1) Nosa, 00) is an air-fuel ratio sensor, mother is a fuel pressure regulator with a T to keep the fuel pressure constant, (12 is a fuel pressure pump, α3 ii*; fuel tank 3. In the above configuration, the control device (6) calculates the required basic fuel consumption i according to the signal from the air quantity sensor (1), and
, the basic fuel amount is corrected by a factor based on various parameters obtained from the water temperature sensor (8), throttle opening sensor (7), and air-fuel ratio sensor (10), and after one correction, a signal is given to the actuator (3). The actuator (3) sets the control position, that is, the fuel discharge amount to the command value of the control device (6). Here, the fuel control valve (2) is supplied with fuel sent from the pressurizing pump (2) and regulated by the fuel pressure regulator α1), so that the amount of fuel discharged is equal to that of the actuator (3).
Continuous injection is carried out under continuous control according to electrical signals applied to the injector.

- In transient conditions such as acceleration and deceleration, as shown in Figure 2, the amount of fuel can be immediately increased according to the signal obtained from the throttle opening sensor (7), which is different from conventional intermittent injection. As shown in the figure, the engine has extremely excellent one-time response, which means that there is no shortage of fuel until the next injection timing. In the above explanation, the air amount sensor (1) may be replaced with another sensor that indicates the load condition of the engine, such as an intake pipe pressure sensor, and the throttle opening sensor (7) may be replaced with another sensor that indicates the engine load condition, for example, and the throttle opening sensor (7) may be replaced with another sensor that indicates the engine load condition. The same effect can be obtained by substituting the rate of change.

The position of the fuel control valve (2) is controlled by an actuator, and the discharge amount valve opening can be continuously varied. It may be a power type.

As described above, in the present invention, after calculating the required basic fuel amount using electronic calculation, f correction is performed according to various conditions of the internal combustion engine, and the result is immediately reflected as a continuous flow rate of fuel. Therefore, the responsiveness of the fuel increase correction is quick and excellent even in a transient state such as with intake air, which has one effect. In addition, the amount of fuel is calculated by an electronic circuit and has the flexibility of one-time control, making it easy to adapt to various engines.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the fuel injection device for an internal combustion engine according to the present invention, and FIG. 2 is a comparative explanatory diagram of the fuel discharge amount of the present invention and a conventional example with respect to changes in the opening degree of the throttle valve.
, In the figure, (1) is the air amount sensor, (2) is the fuel control valve, (
3Y (actuator, (4) is throttle valve, (5) is internal combustion engine, (6) is control device, (7) is throttle opening sensor, (8) C water temperature sensor, (9) is intake temperature sensor,
aO) is the air-fuel ratio sensor, (1υ is the fuel pressure regulator.

Claims (1)

[Claims] A first fuel flow control valve connected to a fuel path with a predetermined pressure electrically controls the fuel discharge amount continuously, and controls the engine load such as the engine intake air amount according to the magnitude of the signal. Set the basic discharge amount of fuel flowing through the fuel flow control valve,
The basic discharge amount is corrected according to at least one element among various conditions such as engine temperature, intake air temperature, atmospheric pressure, acceleration/deceleration state, and detected air-fuel ratio value, and based on the corrected and calculated value. A fuel injection device for an internal engine, comprising a control means for generating an electrical signal for controlling an opening area of the fuel flow control valve.