JPS5862337A - Control device of number of revolution in internal- combustion engine - Google Patents

Abstract

PURPOSE:To obtain a high capacity of response without being influenced by the temperature of an engine by changing the proportional relation between a target number of revolutions and a correction amount of a throttle opening in accordance with the temperature of the engine. CONSTITUTION:For controlling the number of revolutions of an internal combustion engine, a deviation (c) between a target number of revolutions (b) by a setter 30 and a detection signal (a) from a number of revolutions sensor 20 is integrated by an integrator 40, and a throttle opening correction amount (f) is added to obtain a throttle set opening (d). In accordance with this set opening (d), a throttle valve 11 is operated via an opening controller 50. This correction amount (f) is added for improving the capacity of response when the target number of revolutions (b) is changed. The relation between this correction amount (f) and the target number of revolutions (b) is determined by a correction element 70 in accordance with a temperature of the engine given by a temperature sensor 80. This construction permits to obtain a high capacity of response without being influenced by the temperature of the engine 10.

Description

Detailed Description of the Invention The present invention provides feedback control of the rotational speed of the internal combustion engine to a predetermined target rotational speed by manipulating the throttle opening in an internal combustion engine installed in an automobile or the like. The present invention relates to a rotation speed control device for an internal combustion engine.

An example of a conventional rotation speed control device for an internal combustion engine of this type will be explained with reference to FIG.

In FIG. 1, 10 is an internal combustion engine that serves as the driving source of the automobile, 11 is a throttle valve that adjusts the intake air amount of this internal combustion engine, 20 is a rotation speed sensor that detects 100 rotations of the internal combustion engine, and 30 is a target 40 is a setting device for setting the rotation speed; 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 target rotation speed; 50 is an integrator for this; This is an opening controller that controls the opening of the throttle valve 11 at one time using the output of the integrator 40 as the set opening d.

The operation of a conventional example of a rotational speed control device comprising the above-mentioned parts will be explained with reference to the timing chart shown in FIG. For example, if the target rotation speed increases, the integrator 40 integrates the rotation speed deviation C resulting from this increase,
The set opening degree d gradually increases, and in response to this, the opening degree of the throttle valve 11 is increased, and as a result, the actual rotational speed a increases and eventually reaches the target rotational speed. Next, contrary to the above explanation, when the target rotational speed a decreases, the actual rotational speed a is controlled to the reduced target rotational speed by almost the same operation as described above.

By the way, in the conventional rotation speed control device described above, since the rotation speed of the internal combustion engine is controlled by feedback (feedback control), its responsiveness is poor. Therefore, if, for example, the control gain is set high in order to improve the response, the stability during steady state will be impaired.

As a countermeasure to this problem, another conventional example in which open loop control is introduced is shown in FIG. In FIG. 3, 60 is proportional to the target rotation speed. This is a corrector that adds the correction amount f to the output e of the integrator 40. Note that the configuration of the conventional rotation speed control device shown in FIG. 3 other than the above-mentioned configuration is the conventional example shown in FIG.
3, the same reference numerals as in FIG. 1 are given to the parts having the same structure, and the explanation thereof will be omitted. As shown in Figure 4.

This is because the target rotational speed and correction amount f of the corrector 60 are set in a proportional relationship according to the throttle opening and rotational speed of the internal combustion engine to be controlled.

FIG. 3 is a timing chart of the rotation speed control device which is the third cause.

In the above-mentioned rotational speed control device having the configuration shown in FIG. Since time is not involved, it is possible to realize rotation speed control with good responsiveness.

By the way, in an internal combustion engine, the relationship between the throttle opening and the engine speed generally depends on the temperature of the engine, and the engine speed tends to increase with the engine temperature for the same throttle opening.

Therefore, in the rotation speed control device shown in FIG. 3, the relationship between the target rotation speed and the correction amount f is 11, for example, internal combustion engine
If it is set according to the relationship between throttle opening and rotation speed during low-temperature operation at 0, the correction amount during high-temperature operation will not be appropriate, and this will impair the responsiveness of rotation speed control. There is a problem with becoming.

This invention detects the temperature of the internal combustion engine with a temperature sensor, and appropriately changes the proportional relationship between the target rotation speed and the correction amount by the corrector according to the detected temperature.
It is an object of the present invention to provide a rotation speed control device for an internal combustion engine that solves the above-mentioned problems and provides good responsiveness without being affected by engine temperature.

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

In FIG. 6, 70 is a temperature sensor that detects the engine temperature of the internal combustion engine 10, and 60 is a corrector υ, and the correction amount f output by this corrector 60 depends on the internal combustion engine lO detected by the temperature sensor 70. It is set in advance to change depending on the time. FIG. 7 shows the change in the relationship between the correction amount f output by the correction device 60 and the target rotation speed due to the engine temperature. Line L1 in FIG. This is the change when the temperature is high. The configuration and basic operation of this embodiment other than those described above are the same as those shown in FIG. 3, so the same components are given the same reference numerals in FIG. 6 as in FIG. 3, and their explanation will be omitted.

In the rotation speed control device of the embodiment described above, since the relationship between the correction amount f and the target rotation speed is determined according to the engine temperature of the internal combustion engine 10 detected by the temperature sensor 70, the target rotation speed is The change in the correction amount f when the value f changes becomes an appropriate amount regardless of the engine temperature. Therefore, there is no deterioration in responsiveness due to changes in engine temperature, unlike in conventional systems.

As explained above, the present invention detects the engine temperature using a temperature sensor so that the proportional relationship between the correction amount by the corrector and the target rotation speed changes appropriately according to the engine temperature of the internal combustion engine. Therefore, it is possible to provide a rotation speed control device for an internal combustion engine that exhibits good responsiveness without being affected by engine temperature.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional example of a rotation speed control device for an internal combustion engine, Fig. 2 is a timing chart showing the operation of the rotation speed control device of Fig. 1, and Fig. 3 is a conventional rotation speed control device on the other side. 4 is a characteristic diagram of the corrector of the rotation speed control device shown in FIG. 3, FIG. 5 is a timing chart showing the operation of the rotation speed control device shown in FIG. 3, and FIG. 6 is a block diagram showing the control device. 7072 and 7, which show a rotation speed control device according to an embodiment of the present invention, are characteristic diagrams of the corrector of the rotation speed control device shown in FIG. 6. 10... Internal combustion engine, 11... Throttle valve, 20...
... Rotation speed sensor, 30... Setting device, 40... Integrator, 50... Opening controller, 60... Corrector, 70...
...Temperature sensor. In addition, the same reference numerals in the figures indicate the same or corresponding parts.
Shin Kuzuno - Figure 2 IN4 Figure 5 d - 111 Figure 7

Claims (1)

[Claims] In a rotation speed control device for an internal combustion engine, the rotation speed of the internal combustion engine is feedback-controlled to a predetermined rotation speed by operating a throttle valve, and the temperature sensor detects the temperature of the internal combustion engine. and a corrector for controlling the throttle opening by a correction amount proportional to the target rotation speed, and the proportional relationship between the target rotation speed and the correction amount is determined according to the temperature of the internal combustion engine detected by the temperature sensor. A rotation speed control device for an internal combustion engine, characterized in that the rotation speed is controlled to vary.