JPS58185949A - Fuel feed controller for internal-combustion engine - Google Patents

Abstract

PURPOSE:To realize such a fuel feed control as being excellent in responsiveness, by detecting a state of engine's acceleration and deceleration from the on/ off valve speed of a throttle valve, while adding a fuel increment/decrement portion determined in response to size of the negative pressure of a suction pipe to the specified fuel injection quantity. CONSTITUTION:An opening sensor 16 is connected to a throttle valve 13 to be installed inside a suction pipe 11, and the output signal is inputted into a discriminator device 17. The discriminator device 17 is constituted so as to output a signal when on/off valve speed of the throttle valve 13 reaches the specified valve while the signal is inputted into a control unit 18 together with each output of an air volume sensor 12 and a pressure sensor 14 in the downstream of the throttle valve 13. Then, this control unit 18 compensates the increment and decrement portion predetermined according to the output level of the pressure sensor 14 additionally to a fuel injection quantity findable from a suction air quantity, etc., when the signal is outputted from the discriminator device 17, and is constituted so as to drive and control a fuel injection valve 15, in compliance with thus compensated fuel injection quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply control device for an internal combustion engine, and more particularly, the present invention relates to a fuel supply control device for an internal combustion engine, and more specifically, for example, in an internal combustion engine of an automobile, the amount of fuel to be supplied to the internal combustion engine is calculated according to its operating parameters, and the calculation result is calculated. The present invention relates to a device that controls the supply of fuel to an internal combustion engine by energizing a fuel injection valve based on .

Conventionally, some fuel supply control devices of this type have a function of increasing or decreasing the amount of fuel supplied during acceleration or deceleration of an internal combustion engine. The first conventional fuel supply device with such a function was
A sudden change in intake air pressure of an internal combustion engine during acceleration or deceleration is detected, and upon this detection, the amount is increased or decreased by a predetermined amount. However, in this conventional device, the operation for accelerating the internal combustion engine,
For example, when actually increasing the amount of fuel after stepping on the accelerator pedal, it is necessary to go through the process of detecting changes in intake air pressure as described above, which delays the increase or decrease operation and prevents the desired fuel supply from being performed. do not have.

It seems that the delay in detecting deceleration on an incline can be improved by increasing the sensitivity of the rate of change in intake air pressure, but the actual intake air pressure always fluctuates to some extent as the internal combustion engine rotates. 20 to somHg), and the range of this fluctuation is large, especially at low engine speeds, and as mentioned above, there is a limit to increasing the detection sensitivity of acceleration/deceleration.
As long as the judgment is within the limit, as described above, the operation to increase or decrease the amount of fuel is delayed, resulting in poor drivability.

In order to eliminate such drawbacks, the opening/closing valve speed of the nine intake air volume valves linked to the accelerator pedal is detected, and acceleration or deceleration is determined when this speed exceeds a predetermined value. A fuel supply control device has been proposed and realized which has the function of increasing acceleration and decreasing deceleration in accordance with the valve opening speed and valve closing speed as described above. According to this fuel supply control device, fuel supply problems caused by time delays in increases and decreases that occurred in early fuel supply control devices were avoided, but the correction amount for increases and decreases was Since it is specified according to the opening/closing speed, it is possible to achieve a preferable correction for acceleration/deceleration in the operating range where there is a close relationship between changes in the amount of intake air and the opening/closing speed of the throttle valve. When accelerating or decelerating from a state where the valve is opened more than 1, the tightness of the relationship becomes considerably less, and there is a problem in that the amount of correction is too much or too little, and the desired fuel supply cannot be achieved. In addition, when acceleration/deceleration is repeated in a short period of time or when the throttle valve is opened/closed in small steps, the increase or decrease may sometimes be reversed, resulting in poor drivability. also occurred.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fuel supply control device for an internal combustion engine that eliminates the drawbacks of conventional fuel supply control devices such as sloping and has always preferable acceleration increase and deceleration decrease functions.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The fuel supply control device for an internal combustion engine according to the present invention will be further explained in detail below with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 shows an embodiment of a fuel supply control device for an internal combustion engine according to the present invention. In this embodiment, the f? :,P! , an air amount sensor 12, a throttle valve 13, a pressure detector, that is, a pressure sensor 14, and a fuel injection valve 15 are sequentially installed in the trachea 1j from the upstream side.

A device that continuously detects the opening or closing speed of the throttle valve 13, that is, an opening sensor 16 is connected to the throttle valve 13, and the opening sensor 16 is composed of, for example, a variable resistor or a differential transformer. This is a converter that converts the displacement caused by the signal into an electrical signal. This opening sensor 16 is electrically connected to a discrimination device 17,
The discrimination device 17 receives the output signal of the opening sensor 16 and outputs a signal when the opening or closing speed of the throttle valve 13 reaches a predetermined value, and the discrimination device 17 outputs a signal when the opening or closing speed of the throttle valve 13 reaches a predetermined value. and a comparison/determination circuit that compares the value with a predetermined value.

On the other hand, an air amount sensor 12 that detects the amount of air passing through the intake pipe 11 to be taken into the engine 10 is electrically connected to a control device 18, and the control device 18 uses information obtained from the air amount sensor 12. Based on this, the required amount of fuel is calculated by taking in the temperature of the engine 10, the intake air temperature, etc. as some correction information, and the fuel injection valve 15 is driven based on the result.

This control device 18 includes a discrimination device 17 and a pressure sensor 1.
The output signals from the discrimination device 17 and the pressure sensor 14 are also input as information, and when the signal from the discrimination device 17 is input, the pressure sensor 1
A predetermined amount of increase or decrease is added to the calculation result according to the output level of No. 4, and the fuel injection valve 15 is driven based on the final result. Therefore, when there is no signal output from the discrimination device 17, normal fuel supply is executed.

FIG. 2 shows waveforms of changes in the opening of the throttle valve, the signal output of the discriminating device, the intake air pressure, and the acceleration increase over the same period of time in this embodiment. Although these waveform diagrams are schematically drawn, they generally show actual changes. Referring to FIG. 2, when the throttle valve 13 starts to open as shown in FIG. (Figure 2(b)). that time,
The signal output from the pressure sensor 14 also increases as the intake air pressure increases (Fig. 2 (C)).
), the fuel injection valve 15 is driven to increase the amount of fuel for acceleration. However, when the throttle valve 13 is opened and closed in increments after the throttle valve 13 is closed from fully open to low opening,
As shown in FIG. 2(b), the discrimination device 17 generates a corresponding pulse, but since the signal output from the pressure sensor 14 does not reach a predetermined level, the control device 18 does not increase the acceleration.

As described above, according to the fuel supply control device for an internal combustion engine of the present invention, the timing at which to reduce the force [1st gear level or deceleration] is determined when the throttle valve opening and closing speeds have reached a predetermined value. The decision is made when there is a signal output from the plate discrimination device. On the other hand, after determining this timing, it is decided whether to actually supply more or less fuel to the engine, and whether to increase or decrease the amount of fuel. Since the degree of fuel reduction is made according to the magnitude of the engine's intake air pressure, the amount of fuel is increased or decreased without any delay in response to acceleration/deceleration operations performed at any time at the driver's will, and No matter how unnatural or unexpected the behavior of the acceleration/deceleration operation is, desired fuel supply control can always be achieved without deteriorating the operating condition of the engine.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the fuel supply control device for an internal combustion engine according to the present invention, and FIGS. 2(a) to 2(d) show the opening degree of the throttle valve constituting the embodiment, FIG. 3 is a waveform diagram showing changes over time in the output signal of the discriminator, intake air pressure, and acceleration increase. DESCRIPTION OF SYMBOLS 10... Internal combustion engine, ■1... Intake pipe, 12... Air amount sensor, 13... Throttle valve, 14...-Pressure sensor, 15... Fuel injection valve, 16... Opening sensor, 17
--Discrimination device, 18--Control device ff. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno - Commissioner of the Japan Patent Office 1. Indication of the incident: Patent Application No. 57-69025 2,
Name of the invention Fuel supply control device for internal combustion engines 3 Relationship to the case of the person making the amendment Patent applicant address 112-3 Marunouchi 2-chome, Chiyoda-ku, Tokyo
Name (601) Mitsubishi Electric Corporation Representative Hitoshi Katayama 4, Agent address 2-1 Marunouchi, Chiyoda-ku, Tokyo] 2-3
No. 5 within Mitsubishi Electric Co., Ltd. Column 6 for detailed description of the invention in the specification subject to amendment Contents of the amendment In the present specification, page 2, line 14 and page 3, line 1
The words "accelerator pedal" written in lines 9 and 10 have been corrected to "accelerator pedal." 7. More than a list of attached documents

Claims (1)

[Claims] A fuel injection valve installed in an intake pipe connected to an internal combustion engine and operated electrically or magnetically; a device for detecting the opening or closing speed of a throttle valve installed in the intake pipe; a discriminator that outputs a signal when the output signal of the throttle valve matches a predetermined value; a pressure detector that detects the intake air pressure in the intake pipe downstream of the throttle valve; and a pressure detector that calculates the amount of fuel according to the operating parameters of the internal combustion engine. a control device that corrects the calculation result of the fuel amount according to the output level of the pressure detector when the signal is output from the discrimination device, and adjusts the calculation result of the fuel amount based on the correction result. A fuel supply control device for an internal combustion engine, characterized in that it energizes an injection valve.