JPS6343571B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) This invention connects an actuator to a throttle valve of an engine to open and close the throttle valve, and drives the actuator in accordance with the amount of depression of an accelerator pedal. This invention relates to a throttle valve control device for an engine that electrically controls opening and closing of a throttle valve.

(Prior Art) As mentioned above, a throttle control means for electrically controlling the opening and closing of a throttle valve has been conventionally available (for example, Japanese Patent Laid-Open No. 138235/1983).

This type of throttle control means determines the opening degree of the throttle valve between fully closed and fully open in any rotation range according to the amount of depression (opening degree) of the accelerator pedal, and controls the throttle valve according to the determined target throttle. Since the throttle valve is driven by the opening, for example, if output is required when the engine is rotating at low speed, the intake air amount will be saturated when the throttle valve opens at about 60%, so the remaining 40% Even if the throttle valve is operated by %, there is no change in the engine output. In other words, there will be no change in output after 60% of the accelerator pedal is depressed.

Therefore, the output does not change even if the accelerator pedal is pressed from the position where the air volume is saturated to full throttle, giving the driver a sense of discomfort.Furthermore, when decelerating, even if the accelerator pedal is lowered until the intake air volume is saturated, the output does not change. , since the speed is not reduced, there is a problem of poor response to accelerator operation.

(Object of the Invention) An object of the present invention is to set the opening degree of the throttle valve when the accelerator pedal operation amount (opening degree) is maximum according to the engine speed, and to adjust the throttle valve opening degree for other accelerator pedal operation amounts. By making the throttle valve opening gradually increase in response to an increase in the amount of accelerator operation, the engine throttle valve can convey to the driver a reliable response to the accelerator pedal no matter what the engine's output is. The purpose is to provide a control device.

(Structure of the Invention) This invention sets the opening degree of the throttle valve when the accelerator pedal operation amount is maximum according to the engine speed, and also sets the opening degree of the throttle valve for other accelerator operation amounts. The present invention is characterized in that the engine throttle valve control device is provided with a setting means for setting control such that the opening degree of the throttle valve is gradually increased in response to an increase in the amount of operation of the accelerator.

That is, as shown in FIG.
has a throttle valve 11, and when the accelerator pedal operation amount detection means 12 detects the operation amount of the accelerator pedal, the control means 13 detects the operation amount QA,
The setting means 14 calculates the target intake air amount Qa based on the engine speed Ne, and further calculates the target throttle angle THO based on the calculated target intake air amount Qa and the engine speed Ne. The throttle valve opening when the accelerator pedal operation amount is maximum is set according to the engine speed, and the throttle valve opening is set for other accelerator pedal operation amounts, and the throttle valve opening is set as The control means 13 is configured to control the throttle valve 11 at the target throttle angle THO based on the above settings, and is an engine throttle valve control device that controls the opening and closing of the throttle valve 11 at the target throttle angle THO. .

(Effects of the Invention) According to the present invention, different amounts of intake air can be obtained in all the operating regions of the accelerator pedal at any engine speed, so there is a region in which the output does not change with respect to changes in the amount of depression of the accelerator pedal. This eliminates the problem of causing discomfort to the driver, and improves the responsiveness of the engine output to the operation of the accelerator pedal, improving reliability.

(Example) An example of the present invention will be described in detail below based on the drawings.

The drawing shows a throttle valve control device for an engine, and in FIG.
5 and a piston 16, an intake passage 18 and an exhaust passage 19 are connected to the combustion chamber 17, and each passage 1
An intake valve 20 and an exhaust valve 21 are connected to the connection portions 8 and 9.
A spark plug 2 is provided in the combustion chamber 17.
2 is installed.

A throttle valve 11 is provided upstream of the intake passage 18, a fuel injection valve 23 is provided downstream thereof, and an O2 sensor 2 is provided in the exhaust passage 19.
4 are provided, and the intake passage 18 and the exhaust passage 19 are further connected to a bypass passage 25 for exhaust gas recirculation.
This bypass passage 25 is connected by
An EGR valve 26 is provided.

An actuator 27 consisting of a forward and reverse rotation motor is connected to the aforementioned throttle valve 11, and the throttle valve 11 is driven to open and close by rotating the actuator 27 in the forward and reverse directions.

Further, the throttle valve 11 is provided with a throttle opening sensor 28 that detects the opening of the valve 11.

The engine 10 configured as described above is controlled by an engine control unit 29,
This unit 29 includes a signal indicating the oxygen concentration from the aforementioned O2 sensor 24 and a throttle opening sensor 28.
A signal indicating the throttle opening of the accelerator opening, a signal indicating the accelerator opening of the accelerator opening sensor 30, and a TDC signal of the crank angle sensor 31 are input, and based on these signals, the spark plug 22, the fuel injection valve 23,
Controls the EGR valve 26 and actuator 27,
The engine 10 is driven.

FIG. 3 shows a control circuit for controlling the actuator 27 of the throttle valve 11 included in the engine control unit 2 described above.

The CPU 32 controls each circuit device according to the program stored in the ROM 33, and the RAM 34 stores and reads data.

The actuator drive circuit 35 is controlled by the CPU 32 and drives the actuator 2 of the throttle valve 11.
7 in forward and reverse directions.

Furthermore, the throttle opening sensor 28, the accelerator opening sensor 30, and the crank angle sensor 31 are connected to the CPU 32 via an input interface 36.

The throttle valve control device configured as described above sets the throttle valve opening when the accelerator pedal operation amount (accelerator opening degree) is maximum according to the engine speed, and also sets the throttle valve opening degree when the accelerator pedal operation amount (accelerator opening degree) is the maximum. The throttle valve opening is controlled so that the throttle valve opening gradually increases as the accelerator operation amount increases.

The above control process will be explained below with reference to FIG.

The TDC signal input from the crank angle sensor 31 is subjected to interrupt processing every time it occurs, and in a first step 41, the TDC signal is processed based on the elapsed time between the previously input TDC signal and the currently input TDC signal. The period of is calculated, and in a second step 42, based on the period mentioned above,
The engine speed Ne is calculated and stored in a predetermined area of the RAM 34.

In the main routine, the system is initialized in the 11th step 51, and the accelerator opening sensor 30 is activated in the 12th step 52.
The target intake air amount Qa is determined based on the signal QA indicating the accelerator opening input from the engine and the engine speed Ne.
is determined by the map of the target intake air amount Qa shown in FIG.

In this case, as shown in Figure 6, the throttle valve opening when the accelerator is fully open is set according to the engine speed Ne, and the output for other accelerator openings is set as shown in Figure 6. The output is set to increase gradually as the temperature increases.

In a third step 53, the above-mentioned target intake air amount Qa is divided by the engine speed Ne to calculate the intake air filling amount per revolution, that is, the target air filling amount QC.

In a fourth step 54, a target throttle angle THO is determined based on the already determined target charging amount QC and engine rotational speed Ne using a throttle opening map shown in FIG.

Thereafter, the process returns to the second step 52 described above.

Actuator 27 of the aforementioned throttle valve 11
The processing for manipulating is executed by time interrupt processing.

In the 21st step 61, the throttle opening sensor 2
8 is read, and this signal is A/D converted to obtain the actual throttle angle THR. At the 22nd step 62, the process is carried out at the 14th step 54 described above.
The target throttle angle THO obtained in step 63 is compared with the actual throttle angle THR described above, and if it is determined that the actual throttle angle THR is large, in step 63, the actuator drive circuit 35 is instructed to rotate in the closing direction. If it is determined that the target throttle angle THO is large, a signal instructing the actuator drive circuit 35 to rotate in the opening direction is output in a 24th step 64.

Then, the actuator drive circuit 35 opens and closes the throttle valve 11 based on the above-mentioned command, and controls the actual throttle angle THR to become the target throttle angle THO.

In this way, the throttle valve 11 is controlled to open and close, and the engine 10 is driven.

In the case of the above embodiment, the throttle opening when the accelerator pedal is depressed at its maximum is set according to the engine speed, and the throttle opening for other depressions is set as follows: Since the throttle valve opening degree is set to gradually increase, there is no play in which the output does not change when the accelerator pedal is depressed, and responsiveness is improved.

In the correspondence between this invention and the above-described embodiment, the accelerator pedal operation amount detection means 12 of this invention
corresponds to the accelerator opening sensor 30 of the embodiment, and similarly below, the control means 13 corresponds to the accelerator opening sensor 30 of the embodiment.
Corresponding to the processing of the 12th to 14th steps 51 to 54, the setting means 14 performs the processing of the 12th step 5 of the CPU 32.
Although the other parts correspond to the configuration of the same part names as in the embodiment, the present invention is not limited to the embodiment.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a block diagram of the invention, FIG. 2 is a block diagram of an engine, FIG. 3 is a block diagram of a control circuit for a throttle valve, and FIG.
5 is a map of the target intake air amount, FIG. 6 is a map of the correspondence between accelerator pedal operation amount and output, and FIG. 7 is a map of the target throttle opening. 10...engine, 11...throttle valve, 12...
Accelerator pedal operation amount detection means, 13... Control means, 14... Setting means, 27... Actuator, 2
8... Throttle opening sensor, 29... Engine control unit, 30... Accelerator opening sensor,
32...CPU, 35...actuator drive circuit.

Claims (1)

[Scope of Claims] 1. Accelerator pedal operation amount detection means for detecting the operation amount of the accelerator pedal, a throttle valve, and control for controlling the opening degree of the throttle valve in accordance with the detection amount of the accelerator pedal operation amount detection means. A throttle valve control device for an engine having means for controlling the throttle valve by setting the throttle valve opening degree when the accelerator pedal operation amount is maximum to a different value depending on the rotation speed, Engine throttle valve control characterized in that a setting means is provided for controlling the throttle valve opening degree in response to the pedal operation amount so that the throttle valve opening degree gradually increases in all operation areas in response to an increase in the accelerator operation amount. Device.