JPS5853648A - Idle speed controller of internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent occurrence of a drop down phenomenon in an engine speed at deceleration in idle operation, by controlling a throttle opening in accordance with a change of actual idle speed. CONSTITUTION:An arithmetic means 100 is constituted by an arithmetic unit 80, outputting a proportional value to a change of actual speed (a) in a range with output of the actual speed (a) from a speed sensor 30 at least a certain level higher than a target speed (b), and an arithmetic unit 40, comparing the actual speed (a), detected by the speed sensor 30, with the target speed (b) and outputting an integrated value of the deviation (c). Then at deceleration of an internal- combustion engine 10 after being raced, its actual speed (a) is dropped, however, the arithmetic unit 80 genetates an output value in proportion to the drop of the actual speed (a), and a target control position (e) rises to increase an actual control position (d) of a throttle stopper 20, thus opening of a throttle valve 11 is increased. As a result, a dropping speed of the actual speed (a) can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an internal combustion engine installed in an automobile or the like, in which the actual idle speed of the internal combustion engine is predetermined by manipulating the throttle opening degree during idling operation of the internal combustion engine. The present invention relates to an idle rotation speed control device for an internal combustion engine that performs feedback control to a target rotation speed.

The conventional idle speed control device for this type of internal combustion engine is
The diagram will be explained.

In FIG. 1, reference numeral 10 indicates an internal combustion engine that serves as a driving source for an automobile, reference numeral 11 indicates a throttle valve that adjusts the intake air amount of the internal combustion engine, and reference numeral 20 indicates a throttle valve that determines the timing of the throttle valve 11 during idling operation of the internal combustion engine 10. 3o is a rotational speed sensor for detecting the rotational speed of the internal combustion engine 10, 4
0 is a calculation that compares the actual rotation speed a detected by this rotation speed sensor 30 with a predetermined desired target rotation speed and integrates the deviation C to determine the target operating position*(target opening>et 50 is the actual position of the above squirt stopper (
A position sensor 60 detects the actual throttle opening degree) d, and a position sensor 60 is a position sensor 60 that detects the throttle angle f so that the actual position d coincides with the target position e according to the positional deviation f between the target position e and the actual position d.
Throttle valve 11t-operating driver via 20'i;
Reference numeral 70 denotes an idle switch that determines whether or not the internal combustion engine 10 is in idle operation using information such as the opening position information of the throttle valve 11, and causes the arithmetic unit 40 to execute or stop the integral calculation according to this result. .

The operation of the conventional idle speed control device consisting of the above-mentioned parts will be explained with reference to the time chart shown in FIG. When the internal combustion engine 10 is in an idle operating state, the calculator 40 executes an integral calculation based on the output of the idle switch 70. Now, for example, if for some reason the actual rotational speed a output from the rotational speed sensor 30 drops relative to the target rotational speed, the calculator 40 integrates the rotational deviation resulting from the drop, and calculates the target operating position e. The throttle valve 11i rises in the opening direction. As a result, the actual opening position of the throttle valve 11,
In other words, the target position e should not be thicker than the actual operating position d.
The positional deviation f increases in this direction, and the driver 60 moves the throttle lever f20t- in a direction that reduces the positional deviation.
Throttle valve 11 is increased once.

Therefore, the actual rotation speed a increases and reaches the target rotation speed S. Further, contrary to the above explanation, when the actual rotation speed a increases by the target rotation speed, the integration direction of the calculator 4o is reversed and the target operating position decreases, so that the throttle valve 11 is driven in the direction in which the opening degree decreases, and the actual rotational speed a is feedback-controlled so as to become the target rotational speed.

Note that in a region where the throttle valve 11 is not in the idle position, the integral operation of the computing unit 40 is stopped by the action of the idle switch 70, the target operating position flie is held, and the throttle stopper 20 is controlled to that position. Ru.

By the way, in the above-mentioned conventional idle speed control device, when the internal combustion engine 10 is racing, as shown in the time chart of FIG.
0 attribute causes a phenomenon in which the target rotational speed b1 decreases by a substantially constant number during deceleration, which may lead to engine stall. In FIG. 3, Ts indicates the time when the throttle valve 11 leaves the idle position, and T2 indicates the next time when the throttle valve 11 returns to the idle position.

The present invention solves the above-mentioned problem of the drop in engine speed by controlling the throttle opening according to fluctuations in the actual idle speed in the idle speed control device for an internal combustion engine as described above. It is intended to provide idle speed sensor A1 that is not available.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 4, 80 is an arithmetic unit that outputs a value proportional to the variation in the actual rotational speed a when the actual rotational speed a output from the rotational sensor 30 is higher than the target rotational speed. , this calculator 80 compares the actual rotation speed a detected by the rotation speed sensor 30 with the target rotation speed S, and calculates the deviation C.
1-Arithmetic unit 40 that outputs the integrated value and arithmetic means 10
0 is configured, and both arithmetic units 40.80 execute their operations.

The configuration is such that the stop is effected by an idle switch 70. The configuration and basic operation of this embodiment other than those described above are the same as the conventional one shown in FIG. 1, so the same reference numerals as in FIG. 1 will be used in FIG. omitted.

In the above-described idle speed control device according to the embodiment of the present invention, when the internal combustion engine 100 decelerates after racing, its actual speed a decreases, but the calculator 80 controls Since the output of the value is generated, the fifth
As shown in the time chart in the figure, the target operating position e is raised, the actual operating position d of the throttle lever 20 is raised, and the opening degree of the throttle valve 11 is increased. As a result,
Since the falling speed of the actual rotational speed a is slow, there is no drop in the rotational speed.

As explained above, this invention adds a computing unit that outputs a signal to increase the throttle opening according to the decrease in the actual idle rotation speed, so that the throttle valve is opened according to the decrease in the actual idle rotation speed. This has the effect of providing an idle rotation speed control device *t- which does not cause the drop in rotation speed during deceleration during idling operation unlike the conventional ones.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional idle speed control device for an internal combustion engine, Fig. 2 is a time chart showing the operation of the idle speed control device in Fig. 1, and Fig. 3 is a diagram showing the operation during deceleration. FIG. 4 is a block diagram showing an idle speed control device according to an embodiment of the present invention, and FIG. 5 is a time chart showing the operation of the idle speed control device of FIG. 4 during deceleration. 10... Internal combustion engine, 11... Throttle valve, 20...
・・Throttle stroke, 30・・Rotational speed sensor,
40... Arithmetic unit, 50... Position sensor, 60...
Throttle switch, etc., 70...idle switch,
80...Arithmetic unit, 100...Arithmetic means. Note that the same reference numerals in the figures indicate the same or similar parts. Agent Shin Kuzuno −

Claims (2)

[Claims] (1) Idle rotation speed control for an internal combustion engine in which the actual idle rotation speed of the internal combustion engine is feedback-controlled to a predetermined target rotation speed by manipulating the throttle opening during idling operation of the internal combustion engine. In the device,
1. An idle speed control device for an internal combustion engine, characterized in that an arithmetic unit is added that outputs a signal for increasing the throttle speed once in accordance with a decrease in the actual idle speed. (2) The relationship between the decrease in the actual idle speed and the amount of throttle operation once is internal combustion 41! Claim 1, comprising calculation means configured to switch according to the chest motion area.
The idle speed control device for the internal combustion engine described in 2.