JPS5857037A - Speed controller of internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent an excessive change of speed in accordance with a change of load, by responsively operating a load corrector on and off to a load switch and arranging a correcting amount of the load corrector variable in accordance with time change of a load amount of the load objective to the correcting amount. CONSTITUTION:The captioned controller comprises an integrator 40 which integrates a speed deviation (c) between an actual speed (a), from a speed sensor 30, and target speed (b). Then its output (g) is added with a load correcting amount (h) to obtain a target control position (e) from their addition result, in accordance with a position deviation (f) between this target control position (e) and actual control position (d) of a throttle valve 11 by a position sensor 50, the throttle valve 11 is controlled through a driving unit 60 and actuator 20. In this case, a load corrector 90, outputting a load correcting amount (h), is applied with constitution such that in accordance with a detection result of a load switch 70, the load correcting amount (h) changes as time elapses in alignment to a time change of the load amount. In this way, an excessive change of the speed in accordance with a change of the load can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a rotation speed control device for an internal combustion engine installed in an automobile or the like.

A conventional rotational speed control device for an internal combustion engine of this type will be explained with reference to FIG.

In FIG. 1, IO is an internal combustion engine that serves as a driving source for the automobile, 11 is a throttle valve that adjusts the intake air amount of this internal combustion engine, 20 is an actuator that operates the throttle valve ll'lt, and 30 is the rotational speed of the internal combustion engine 1O. 40 is an integrator that integrates the rotation speed deviation C between the actual rotation speed a detected by the rotation speed sensor 30 and a predetermined desired rotation speed, and 70 is the internal combustion engine lO. Load switch for detecting on/off status 1a of load, 80
50 is a load compensation added to the output g of the integrator 40, which is a predetermined constant load correction amount ht when the load is turned on in response to the detection result of the load switch 70, and 50 is the operating position of the actuator 20. position sensor for detecting, 60
is the addition result of the output g of the integrator 40 and the load correction scale, which is the target operating position according to the positional deviation fK between the target operating position e and the actual operating position d detected by the device sensor 50, This is a driver that operates the throttle valve 11' via the actuator 20 described above.

The operation of the conventional rotational speed control device consisting of the above-mentioned parts will be explained with reference to the timing chart shown in FIG. When the load detected by the load switch 70 is in the OFF state, if the actual rotation speed a becomes lower than the target rotation speed A for some reason, the integrator 40 integrates the nine rotation speed deviations C that result. Then, the target operation position e rises. Therefore, the positional deviation f increases, and the driver 60 performs actuation II 20 if' to increase the opening degree of the throttle valve 11. As a result, the actual rotational speed a increases and eventually reaches the target rotational speed. Also, contrary to the above explanation, when the actual rotational speed a increases more than the target rotational speed, the actual rotational speed 1 decreases and reaches the target rotational speed. controlled.

Next, a case in which the load detected by the load switch 70 turns on and then turns off will be described with reference to FIG. 3. When the load shifts from the OFF state to the ON state, the load switch 70 detects this, and in accordance with this detection result, the load corrector 80 performs a predetermined load correction 1ht- The output gK of the integrator 40 is added. As a result, the target operating position d rises by the load correction amount, and the actual operating position d responds to this, and the opening degree of the throttle valve 11 increases. Since this opening increase amount is predetermined according to the amount of the load, the fluctuation in the actual rotational speed due to the change in the on/off state of the load described above is slight. From this point on, the actual rotational speed 1 is controlled to the target rotational speed by the function of the integrator 40, similarly to the above-described off-load state. Next, when the load transitions from on to off, the load switch 7
0 is detected, and as a result, the addition operation by the load compensator 80 is stopped. Therefore, the target operating position d is lowered by the amount by which the addition operation is stopped, and the actual operating position d responds to this and the opening degree of the throttle valve 11 is reduced. In FIG. 3, Tl indicates the time point when the load transitions from OFF to ON state, and TI indicates the time point when the load subsequently transitions to OFF state.

By the way, in the above-mentioned conventional rotation speed control device, for example, as in an internal combustion engine installed in a car with an automatic transmission,
When the amount of load changes over time,
There is a problem in that the actual rotational speed a varies greatly at time Tst or T2 when the load transitions from off to on or from on to off. For example, if the load amount decreases over time, as shown in the tie scaling chart in Figure 4, if you set the load correction amount ht - the maximum load amount, the load will turn on. Although the fluctuation in the actual rotational speed a at time T1 when the load transitions from on to off state is slight, the actual rotational speed 1 at time T3 when the load transitions from on to off state decreases significantly, and in some cases, a carrot stall state may occur. There is a problem in reaching .

This invention solves the above-mentioned problem by making the load correction amount change over time in accordance with the temporal change in the load amount, and is effective against loads whose load amount changes over time. Another object of the present invention is to provide a rotation speed control device for an internal combustion engine that does not cause excessive rotation speed fluctuations.

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

In FIG. 5, 90 is a load compensator, and this load compensator 90 has the same meaning as the load compensator 80 of the above-mentioned conventional example, but the load compensation scale of the load compensator 90 is The correction amount is configured to change over time as the load amount changes over time. Note that the configuration and basic operation of this embodiment other than those described above are the same as those of the conventional example shown in FIG. 1, so the same components are given the same reference numerals as in FIG. 1 in FIG. do.

In the rotation speed control device of the above-described embodiment, when the load shifts from the off state to the on state, the load switch 70 detects this, and the load corrector 90 adjusts the appropriate load correction scale to the integrator 40 in accordance with this detection result. However, the load correction scale changes over time in accordance with the temporal change in the amount of load. For example, if the load amount decreases with time, the load correction 1h is also set in advance to decrease with time. Therefore, as shown in the timing chart of FIG. 6, even at the time point Tl when the load shifts from the on state to the off state, the actual rotational speed 1 decreases only slightly, and there is no risk of the engine stalling.

As explained above, the present invention changes the correction amount of the load compensator, which is turned on and off in response to a load switch, over time in accordance with the temporal change in the load amount of the target load. Therefore, it is possible to provide a rotation speed control device for an internal combustion engine that does not cause excessive fluctuations in rotation speed due to changes in load conditions, unlike conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional rotation speed control device for an internal combustion engine; FIGS. 2, 3, and 4 are timing charts showing different operations of the conventional rotation speed control device; FIG. 5 is a block diagram showing a rotation speed control device according to an embodiment of the present invention, and FIG. 6 is a timing chart of the rotation speed control device according to an embodiment of the invention. lO... Internal combustion engine, 11... Throttle valve, 20...
・・Actuator, 30・・Rotation speed increase sensor, 40・
... Integrator, 50... Position sensor, 60... Driver, 70... Load switch, 80... Load compensator, 9
0...Load compensator. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno - Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] The rotational speed of the internal combustion engine is controlled to a predetermined rotational speed by operating a throttle valve.9.The internal combustion engine rotational speed control device detects the on/off state of the load of the internal combustion engine. and a load corrector that controls the throttle opening so that the correction amount changes with time in response to the load switch and in accordance with the temporal change in the load amount. Engine speed control device.