JPS5830449A - Idle revolving speed control apparatus for internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent a probable cause to stall an engine because an actuator comes into a lowest engine speed control position by action from a drive subject, by stopping idling engine speed feedback control when the engine is powered together with the drive subject transmitted. CONSTITUTION:A deflection c between the output of an engine speed sensor 300 which detects a speed a of an engine 100 and a desired engine speed b is inputted to an arithmetic and logic unit 400. An idle switch 700 outputs a throttle valve desired position signal e when detecting a state of idling while a positional deflection f between the said position signal e and the output of a throttle position sensor 500 which detects an actual position d of a throttle valve 101 of the engine 100 is outputted to a driver 600 whereby feedback control for idling engine speed takes place. When a sensor swich 800 is connected to a car clutch as well as when a speed change gear is in a running position, operation of the arithmetic and logic unit 400 is stopped and feedback control is thus stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an idle speed control device for controlling the idle speed of an internal combustion engine installed in an automatic vehicle, etc.2. First, this type of conventional device will be explained with reference to FIG. do. In the same figure, (100) is an internal combustion engine that is the driving source of the car;
(101) is a throttle valve that adjusts the intake air amount of this engine; (200) is a throttle stopper that determines the opening degree of the throttle valve (101) when changing the engine's A/F.
aOO) is a rotation speed sensor that detects the rotation speed of the engine (100), and (400) is a rotation speed sensor that compares the actual rotation speed detected by this rotation speed sensor with a predetermined desired target rotation speed and calculates the deviation ( (500) is a position sensor that detects the actual position (actual throttle opening) of the throttle stopper (200); ) is the target position @(e)
The throttle valve (101) is operated via the throttle stopper (200) so that the actual position (d) matches the target position fN, (e) according to the positional deviation (f) between the actual position ib and (d).
), (700) is a driver for operating the throttle valve (10
This is an idle switch that determines whether the engine is in idle operation based on the opening position information etc. of 1) and causes the arithmetic unit (400) to execute or stop the integral calculation according to the result.

In the conventional device configured in this way, its operation is controlled by a second
To explain with reference to the time chart in the figure, if the engine is in idle operation, the idle switch (700)
The arithmetic unit (400) executes an integral operation based on the output.

Now, for example, for some reason, the actual rotation speed output (a) from the rotation speed sensor (800) may change to the target rotation speed (as shown in FIG. 2).
If it descends from b), the computing unit (400) integrates the rotational deviation resulting from this, and the target position is 1 N\, and (e) rises in the direction of opening the throttle valve (101). As a result, the target position (e) becomes larger than the actual opening position of the throttle valve (101), that is, the stopper position (d), the positional deviation (f) increases in that direction, and the driver (600) moves to that position. Throttle stopper (
200) to drive the throttle valve (101), so that the throttle valve (101) is opened. As a result, the rotational speed (a) increases by 2 and reaches the target rotational speed (a).

Conversely, when the actual rotation speed (a) exceeds the target rotation speed (b), the integration direction of the calculator (400) is reversed and the target position (e) is lowered, so that the throttle valve ( 101) is also driven in the closing direction, and in the end, the actual time 11j7:
The number (a) is feedback-controlled so that it becomes the target rotation number (b).

By the way, when the automatic Llf equipped with the engine (100) runs downhill, for example, with the engine in an idling state and the transmission in the running gear and the clutch connected, the engine (100) Since the rotation speed is increased by the target rotation speed, the arithmetic unit (4
00) lowers the target throttle opening position (e) until it reaches the lowest target position, and the throttle valve (101) is at the lowest opening position. At that point, for example, when the clutch is disengaged, the external force that had been driving the engine (100) up to that point is removed, so the internal combustion engine (100) may enter a stall state depending on the case.

This invention has been made in order to eliminate the problems described in item 2 above, and an object thereof is to provide an idle speed control device that does not exhibit an engine stall condition as seen in the above-mentioned conventional example. I'm at No.

FIG. 8 shows a block diagram of an embodiment of the present invention.

In the figure, (800) indicates that the clutch is connected;
And, it is detected whether or not the transmission is set to a position other than the neutral position, and depending on the result, the idle switch (700) is controlled to perform the calculation RiJ (40
This is a detection switch that stops execution of the calculation in step 0), and is composed of a clutch engagement/disengagement state detection switch, a transmission position switch, a logic circuit, and the like.

In the above configuration, when the clutch of the automobile is connected and the transmission is set to a traveling position other than the neutral position, the computing unit (400) is activated to activate the idle switch (700) by the action of the detection switch (SOO). Regardless of the action, the calculation operation is stopped and the target operation position (
e) is held at the calculation target operating position when the detection switch (800) is operated. Therefore, the target operating position (e) does not decrease due to the internal combustion engine (100) being driven by an external force as seen in the conventional embodiment, and therefore the throttle valve (101) is driven to the lowest opening position. Therefore, the internal combustion engine (100) does not exhibit a stall condition.

In the above embodiment, the operation of the detection switch (800) holds the calculated value of the calculator (400) at that time and stops the feedback control of the rotation speed, but the operation of the detection switch (SOO) Operation unit (40
0) may be held at a predetermined set value and the rotation speed feedback control may be stopped.

As explained above, in this invention, the detection means for detecting the power transmission state between the four gates and the driven object is provided, and the feedback control of the rotation speed is stopped based on the detection output.
Prevents the actuator from being controlled to the lowest rotational speed sensor 1 when the engine rotational speed continues to exceed the target rotational speed due to an external force while the internal combustion engine is connected to its driving partner. This has the effect of providing an idle speed control device that does not exhibit an engine stall condition as seen in the conventional example.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional device, FIG. 2 is a timing chart showing the operation of the device shown in FIG. 1, and FIG. 8 is a block diagram showing an embodiment of the present invention. (100)... Internal combustion engine, (101)... Throttle valve, (200)... Throttle stopper, (aOO
)...Rotation speed sensor, (400)...Arithmetic unit, (5
00)...Position sensor, (600)...Driver, (
700)...Idle switch, (SOO)...Detection switch Note that the same reference numerals in the drawings indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 C

Claims (1)

[Claims] (]) Compare the actual engine speed and the target idle speed, and control the intake air reserve of the engine based on this rotational deviation so that the idle speed for opening and opening is set to the target speed. Idle rotation speed control for an internal combustion engine, comprising means for detecting a state in which power is being transmitted between the engine and its driven object, and performing feedback control of the rotation speed based on the rotational deviation based on the detected force. Attire! 〃. (2) Variation: When ili K is put into the running stage and the clutch for intermittent power transmission is engaged, the feedback control of the rotational speed based on the rotational deviation described in - is stopped. The idle speed control device for an internal combustion engine according to item 1.