JPS58190534A - Idle engine speed control device for internal- combustion engine - Google Patents

Abstract

PURPOSE:To prevent any excessive reduction of an engine speed during deceleration by adding a means for outputting a throttle valve open degree increase signal corresponding to the reduced amount of the opening of the throttle valve, in a device in which an actual idle engine speed is negative feed-back controlled to a desired engine speed. CONSTITUTION:During the operation of an engine 10, the revolution number of the engine is detected by an engine speed sensor 30 and the deviation (c) between the output (a) and a desired engine speed (b) is fed to a calculator 40. In the calculator 40, the deviation (c) is integrated to calculate the desired operation position (a desired opening) (e') during the closure of an idle switch 70 detecting an idle operation. Then, the value proportional to the reduced amount outputted from an opening detector 80 which detects the reduced amount of the opening of a throttle valve (g) is added to the output (e') of the calculator 40 to obtain the desired operation position (e). Then, the throttle valve 11 is operated through a throttle stopper 20 by a driving unit 60 depending on the deviation (f) between the desired position (e) and the actual position (d) given by a position sensor 60 which detects the position of the throttle stopper 20.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an internal combustion engine installed in a vehicle, etc., in which the actual idle speed of the internal combustion engine is set to a predetermined target 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 on the rotation speed.

The conventional idle speed control device for this type of internal combustion engine is
゛Explain the diagram.

In Fig. 1, Ql) is the internal combustion engine that is the driving source of the automobile, aυ is the throttle valve that adjusts the intake air amount of this internal combustion engine, and (E) is the opening degree of the throttle valve αp when the internal combustion engine α1 is idling. The throttle stopper that determines the rotation speed, the rotation speed sensor that detects the rotation speed of the internal combustion engine Q
The actual rotation speed a detected by this rotation speed sensor is
and a predetermined desired target rotational speed, and integrate the deviation C to determine the target operating position (target opening) e; - indicates the actual position of the throttle stopper (e);
The position sensor detects the actual throttle opening (d), and the seagull changes the actual position d according to the positional deviation f between the target position e and the actual position d.
throttle stopper eI so that it matches the target position e.
i) The driver and decoy that operate the throttle valve Qη determine whether or not the internal combustion engine αQ is in idling operation based on the opening position information of the throttle valve (11), and depending on this result, the above-mentioned computing unit - This is an idle switch that executes or stops the integral calculation.

The operation of the conventional idle speed control device consisting of the above-mentioned parts will be explained with reference to the time chart of FIG. 2. When the internal combustion engine 00 is in an idling state, the computing unit executes an integral calculation based on the output of the idle switch 4. For example, if for some reason the actual rotational speed a output from the rotational speed sensor falls below the target rotational speed, the arithmetic unit integrates the rotational deviation C resulting from the drop, and calculates the target operating position e. It rises in the direction of opening the throttle valve 0υ.

As a result, the target position e becomes larger than the actual opening position of the throttle valve aυ, that is, the actual operating position d, the positional deviation f increases in this direction, and the driver moves in the direction of decreasing the positional deviation f. The throttle valve (b) is driven via the throttle stopper (1), and the opening degree of the throttle valve αυ increases.

Therefore, the actual rotation speed a increases and reaches the target rotation speed S. Contrary to the above explanation, when the actual rotation speed a rises higher than the target rotation speed, the direction of integration of the arithmetic unit reverses and the target operating position e decreases, so that the throttle valve αυ 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.

In addition, in region M where the throttle valve 0]) is not at the idle position, the operation of the idle switch 4 causes the arithmetic unit to stop its integral operation, and the target operating position e is maintained.
The throttle lever is controlled to a position other than f(e)1.

By the way, when the internal combustion engine 0Q of the above-mentioned conventional embodiment is decelerated by the operator, as shown in the time chart of FIG.
At the time of deceleration, the actual rotational speed (a) of the internal combustion engine α4
Due to the attributes of the engine, there is a phenomenon in which the rotational speed is once lowered by a certain amount (g) than the steady state. That is, in FIG. 8,
At the time indicated by (T1) in the figure, the driver l
Therefore, when the throttle opening (g) is performed, the throttle opening (g) is closed by the driver at the time indicated by (T2) in the figure. After that, the internal combustion engine enters a deceleration state as 0(H) and its actual rotational speed (a) decreases.
There is a phenomenon in which the rotation speed temporarily drops to 0◇ by a certain amount from the steady state rotation speed at idle before the time shown in l),
This causes a problem in that the engine stalls as a result. Note that (T8) in the same figure indicates the point in time when the idle switch 4 detects that the internal combustion engine αq has reached the idle state. That is, in the same figure (T1
) to (T8), the idle switch 1 detects that the internal combustion engine 0 is in a non-idling state, and during this period, as described above, the idle switch 1 detects that the target operating position (e
) is held, and the throttle stopper (e) is controlled to that position.

This invention has been made in view of the problem that the rotational speed of the internal combustion engine 01 exhibits a drop phenomenon during deceleration, and is an idle rotation speed control device that does not exhibit such a drop phenomenon. is intended to provide.

By the way, this drop in rotational speed is caused by I as mentioned above.
This occurs during deceleration after the throttle valve 0υ is closed, so if the closing of the throttle valve Oη is reflected in the rotation speed control by some means, the drop in the rotation speed can be prevented. It turns out that the phenomenon will disappear.

This invention was made with attention to this point, and there is
By detecting the decrease in the opening degree of the throttle valve (11) and adding this to the output of the arithmetic unit, the target operating position II (e) during deceleration of the internal combustion engine αQ can be calculated as follows:
The above-mentioned drop in rotational speed is eliminated by setting the engine speed to a side higher than that during steady idling.

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

In the figure, - is an opening detector that detects the decrease in the throttle opening (g), which is proportional to the decrease and adds this value to the output of the arithmetic unit to determine the target operating position (e). ). It should be noted that reference numerals 10 to 70 in the figure are the same as those of the prior art, so their explanation will be omitted.

The operation of the device of the present invention constructed as described above will be explained with reference to the timing chart shown in FIG.

The figure shows a series of operations when the internal combustion engine section is accelerated or decelerated by the driver, and in the figure (T1)
indicates the time point when the throttle valve 0υ is opened and an acceleration operation is performed, and (T2) indicates the time point when the throttle valve Qυ is closed and a deceleration operation is performed.

Until (Tl) in the figure, the internal combustion engine OQ is in a steady idle state. Next, at (TI), the throttle valve 0η is opened, the opening degree (g) increases, and acceleration is performed.
Due to the action of the idle switch V1, the output (e) of the arithmetic unit H is held at its immediately previous value, and therefore the target operating position (e) is also held. Thereafter, at (T2), when the throttle valve aυ is closed and the opening W (g) decreases, the opening detector adds a value proportional to the decrease (0)) to the output of the arithmetic unit; The limb target operating position (e) rises, and the opening degree (g) is feedback-controlled to this raised target operating position. Thereafter, in the same figure (T8), when it is detected by the idle switch (71) that the internal combustion engine OQ has reached its idle state, the arithmetic unit performs its integral operation again by the action of the switch (71). Therefore, the increase in the target operating position (e) is absorbed by the integral calculation of this computing unit i4, and the target operating position (e) eventually reaches the value in the steady state before (T1). In this way, when the internal combustion engine αQ is decelerating, the target operating position (e) is set to the wide opening side according to the decrease of the opening (g) of the throttle valve 0, and the internal combustion engine After the OQ transitions to the idle state, the arithmetic unit -
Due to the function of the integral calculation, the increase is absorbed and attenuated.

Therefore, during deceleration, after the actual rotation speed (a) falls to a predetermined rotation speed determined by the increase in the target operation position (e), the rotation speed is negative feedback controlled by the integral calculation, so that the target rotation speed is reduced. Since the number (b) is reached, the drop phenomenon seen in the conventional embodiment does not occur.

The operations during acceleration and deceleration have been described above, but during steady idling, the same operations as in the prior art embodiment are performed. In other words, at steady idle, the throttle opening ω
Since the amount of variation in is normally extremely small compared to that during acceleration and deceleration, the opening detector has no effect, and therefore, the control operation during this period is the same as in the conventional embodiment.

As explained above, in this invention, a means for outputting a signal that increases the throttle opening according to the decrease in the throttle opening is added, so that the throttle opening is increased during deceleration of the internal combustion engine. It is possible to obtain an idle rotation speed control device in which the throttle opening degree is increased during deceleration as in the conventional device, and a drop in the rotation speed does not occur during deceleration as in the conventional device.

[Brief explanation of the drawing]

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 shown in Fig. 1, and Fig. 8 is an operation during acceleration and 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 acceleration and deceleration. be. In the figure, Oo...
・Internal combustion engine, αυ...throttle valve, (a)...throttle stopper, -...rotation speed sensor, gull...computer, -...position sensor, 16Q...driver, 4・
・・Idle switch, −・・Opening degree detector・ In addition, the same reference numerals in the drawings indicate the same or equivalent parts. Agent Makoto Kuzuno - Figure 1 tn 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In an internal combustion engine that performs negative feedback control of the actual idle speed of the engine to a predetermined target speed by manipulating the throttle opening during idling operation, the throttle opening is adjusted according to the decrease in the throttle opening. 1. An idle speed control device for an internal combustion engine, characterized in that the device is further equipped with means for outputting a signal for increasing the speed.