JPS6210439A - Throttle controller for vehicle - Google Patents

Abstract

PURPOSE:To prevent uncomfortable wobbling vibration in the initial time of accelera tion, by controlling a throttle valve driving speed to be decreased for the actual open ing in a predetermined value or less while increased in a predetermined value or more when a clutch is connected further with a valve driving direction in the opening direction. CONSTITUTION:A controller provides a deviation arithmetic means 4 which calculates a deviation between the target throttle opening, set by a setting means 2 in accordance with an output from an accelerator control amount detecting means 1, and the actual opening by an actual opening detecting means 3. While the controller, providing a driving direction discriminating means 6 discriminating a driving direction of a throttle valve in accordance with the polarity of the deviation calculated in the means 4, inputs an output signal from said means 6 to a control amount calculating means 7 with output signals from the actual opening detecting means 3, deviation calculating means 4 and a clutch detecting means 5. And said means 7, calculating a control amount having a characteristic controlling a valve driving speed to be decreased for the actual opening in a predetermined value or less while increased in a predeter mined value or more when a clutch is connected further with a driving direction in the opening direction, controls a valve driving means 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a device for controlling a throttle valve opening in an internal combustion engine for a vehicle.

[Prior art]

In a conventional vehicle internal combustion engine, for example, as shown in FIG. 5, an accelerator pedal 30 and a throttle valve 31 are mechanically directly connected via a wire 32 or the like, and the accelerator pedal 30 is operated! Normally, the (depression amount) directly becomes the adjustment amount of the throttle valve 31.

In addition, as described in Japanese Patent Publication No. 107925 of 1981, the amount of operation of the accelerator pedal is electrically detected and fuel is supplied accordingly, so that the amount of air commensurate with the amount of fuel is supplied. There is also known a device that controls the opening of the throttle valve to supply the engine with a mixture corresponding to the operation of the accelerator pedal.

In addition, as described in Japanese Patent Publication No. 43626/1975, a target vehicle speed is set according to the amount of operation of the accelerator pedal, and the throttle valve opening is controlled so that the actual vehicle speed matches the target vehicle speed. Devices that do this are also known.

In addition, as described in Published Patent Publication No. 25853 of 1982, the amount of operation of the accelerator pedal is detected electrically, and the throttle valve opening is controlled accordingly. There is also known a device that controls the relationship between the accelerator opening and the throttle opening in a specific driving state.

However, the conventional throttle control device as described above is configured to control the driving speed of the throttle valve regardless of whether the clutch is engaged or disengaged, and therefore has the following problems.

[Problem that the invention seeks to solve]

In other words, if the throttle valve drive speed is set to a large value, the response will be better, but when the accelerator pedal is depressed with the clutch engaged, the throttle valves 1 to 1 will open suddenly, causing so-called jerking. This may cause vibrations, etc., which may deteriorate driveability.

Conversely, if the drive speed is set to a small value, the throttle valve opens slowly when the accelerator pedal is depressed, so the deterioration in drivability as described above can be avoided, but the responsiveness deteriorates.

As mentioned above, conventional devices have a problem in that it is difficult to achieve both drivability and responsiveness.

The present invention aims to solve the problems of the prior art as described above.

[Means to solve the problem]

In order to achieve the above object, in the present invention, when the clutch is engaged and the driving direction is the opening direction, the driving speed of the throttle valve is reduced in the range where the actual opening is below a predetermined value, and the actual opening is reduced. The drive speed is configured to be increased in a range where the speed is greater than the predetermined value.

This will be explained in detail below.

FIG. 1 is a block diagram showing the functionality of the present invention.

In FIG. 1, the operation amount detection means 1 includes an accelerator means (
It detects the amount of operation of an accelerator pedal operated by the foot, an accelerator lever operated by hand, etc.), and is, for example, a potentiometer that outputs an analog signal corresponding to the amount of depression of the accelerator pedal.

Next, the target throttle valve opening degree setting means 2 sets a target throttle valve opening degree using the above operation amount as a main variable.

The method for setting this target throttle valve opening is as follows:
For example, various methods can be considered, such as a method in which the target throttle valve opening degree is set in response to the operating amount of the accelerator means, and a method in which the characteristics are changed in accordance with the temperature of the internal combustion engine.

Next, the actual opening detection means 3 detects the actual opening of the throttle valve, and is, for example, a potentiometer that outputs an analog signal proportional to the rotation angle of the throttle valve.

Next, the deviation calculating means 4 calculates the deviation between the target throttle valve opening and the actual opening.

Next, the clutch detection means 5 detects whether the clutch is engaged or disengaged, and is, for example, a clutch switch that responds to a clutch pedal.

Next, the driving direction determining means 6 is a means for determining whether the driving direction of the throttle valve is an opening direction or a closing direction, and determines the driving direction depending on, for example, the sign of the deviation calculated by the deviation calculating means 4 described above. .

In other words, when the target throttle valve opening is larger than the actual opening, the throttle valve is driven in the opening direction.
In the opposite case, it will be driven in the closing direction. Therefore, the driving direction can be determined based on the sign of the deviation.

Next, the control amount calculation means 7 calculates the actual opening degree detection means 3,
Deviation calculation means 4. The control amount is calculated according to the results of the clutch detecting means 5 and the driving direction determining means 6. In particular, when the clutch is engaged and the driving direction is the opening direction,
The control amount is calculated such that the drive speed of the throttle valve is reduced in a range where the actual opening is less than a predetermined value, and the drive speed is increased in a range where the actual opening is greater than the predetermined value.

Next, the drive means 8 drives the throttle valve according to the above-mentioned control amount, and is composed of, for example, a drive circuit and a servo motor.

As mentioned above, when the clutch is engaged and the drive direction is the opening direction, the throttle valve drive speed is reduced in the range where the actual opening is less than the predetermined value, and the drive speed of the throttle valve is reduced in the range where the actual opening is larger than the predetermined value. By configuring the drive speed to be high, the Scots 1 to 1 valves open relatively slowly at the beginning of acceleration, allowing smooth acceleration without unpleasant jerky vibrations. Since the throttle valve opens rapidly, responsiveness can also be improved.

In FIG. 1, the portions surrounded by broken lines, that is, the target throttle valve opening setting means 2, the deviation calculating means 4, the drive direction determining means 6, and the control amount calculating means 7 are controlled by the CPU.
[Embodiment of the Invention] FIG. 2 is a diagram showing an embodiment of the present invention.

In FIG. 2, the clutch switch 11 sends out different signals depending on whether the clutch is disengaged or engaged.

Further, the potentiometer 12 detects the operation amount (depression amount) of the accelerator pedal 13 and outputs it as an analog voltage.

The above clutch switch 11 and potentiometer 12
The signal can be sent directly or if necessary to the AD converter 1.
4 to the microcomputer 15.

The microcomputer 15 performs calculations as described below to set a control amount corresponding to the deviation between the target throttle valve opening and the actual opening, and outputs the result via the DA converter 16.

On the other hand, a servo motor 23 is attached to one end of the rotating shaft 20 of the throttle valve 18.

Further, a return spring 22 is attached between the lever 21 fixed to the other end of the rotating shaft 20 and the fixing point to bias the throttle valve 18 in the fully open direction.

Then, the control amount signal output from the DA converter 16 is amplified by the drive circuit 17 and then transferred to the servo motor 2.
3 and drives the servo motor 23 to rotate by a predetermined angle.

Further, a potentiometer 24 that generates a signal corresponding to the rotation angle of the servo motor 23 is attached. This is fed back to the microcomputer 15 and controlled so that the rotation angle of the servo motor 23, that is, the opening degree of the throttle valve 18, matches the target throttle valve opening degree.

Next, the contents of calculations in the microcomputer 15 will be explained.

FIG. 3 is an embodiment of a flowchart showing the above calculation, and this calculation is repeatedly performed at a predetermined timing.

In FIG. 3, first, at Pl, the accelerator stroke, that is, the amount of depression of the accelerator pedal is read.

Next, in P2, the target throttle valve opening θ is determined using the above-mentioned accelerator stroke as the main variable. Calculate.

Next, in P3, the actual opening degree θ of the throttle valve is read.

Next, in P4, the target throttle valve opening θ. and actual opening degree θ
Calculate the deviation formula 〇 (Δθ=θ.-〇).

Next, in P5, it is determined whether the driving direction of the throttle valve is the opening direction.

This determination is made by determining whether the deviation Δθ at P4 is positive or negative.

If YES in P5, the process goes to P6 and it is determined whether the clutch is engaged or not.

If YES in P6, the process goes to Pl, and it is determined whether the actual opening degree θ is less than or equal to the predetermined value θS.

When P5, P6, and Pl are NO, that is, when the driving direction of the throttle valve is in the closing direction, when the clutch is disengaged, and when the actual opening degree θ is larger than the predetermined value O3, P
8, and set the characteristic to have a large drive speed.

On the other hand, if YES in P7, that is, if the clutch is engaged, the throttle valve drive direction is in the opening direction, and the actual opening is less than the predetermined value, the process goes to P9 and the drive speed is set to a small characteristic. .

Next, in PLO, a control amount is calculated based on the deviation calculated in P4 and the characteristics of the driving speed determined in P8 or P9, and the control amount is output.

Next, the present invention will be explained in detail.

FIG. 4 shows the control characteristics when the clutch is engaged, and when the driving speed is high, when the driving speed is low, and when the present invention (
(a combination of large and small) is shown in contrast.

As can be seen from Figure 4, if the drive speed is set to a large value when the clutch is engaged, the throttle valve opening will rapidly increase in accordance with the amount of depression of the accelerator pedal, and as a result, the The acceleration fluctuates as shown, producing unpleasant vibrations called jerky vibrations.

On the other hand, when the drive speed is set to a small value, the throttle valve opens slowly, so the jerky vibrations described above do not occur. However, the increase in engine speed also becomes gradual, resulting in poor responsiveness.

In contrast, in the present invention, the driving speed is reduced in the range where the throttle valve opening is less than the predetermined value θS, and the driving speed is increased in the range where the throttle valve opening is larger than the predetermined value, which causes unpleasant jerky vibrations. This eliminates the need to do so, and also maintains good responsiveness.

〔Effect of the invention〕

As explained above, in the present invention, when the clutch is engaged and the driving direction is the opening direction, the driving speed of the throttle valve is reduced in the range where the actual opening is below the predetermined value, and the actual opening is set to the above-mentioned predetermined value. By configuring the drive speed to be increased in a range larger than the value, the throttle valve opens relatively slowly at the beginning of acceleration, allowing smooth acceleration without unpleasant jerky vibrations. In this case, since the throttle valve opens rapidly, responsiveness can be improved, and an excellent effect can be obtained in that control characteristics that achieve both drivability and responsiveness can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the functions of the present invention, Fig. 2 is an embodiment of the invention, Fig. 3 is an embodiment of a flowchart showing the calculation contents of the invention, and Fig. 4 is an embodiment of the invention. FIG. 5 is a comparison diagram of the control characteristics of the conventional device, and is an example of the conventional device. <Explanation of symbols> 1... Manipulated amount detection means 2... Target throttle valve opening setting means 3... Actual opening detection means 4... Deviation calculation means 5... Clutch detection means 6...・Drive direction determining means 7... Controlled amount calculation means 8... Drive means agent patent attorney Junnosuke Nakamura 1 Figure 7゛Country 1 No. 5 Crotch Sai 2 Evil 2 473 times ++ Kokotsutsumi 9 l) - 11th Sai from O 5 Mouth υ

Claims (1)

[Claims] operation amount detection means for detecting the operation amount of the accelerator means;
a target throttle valve opening setting means for setting a target throttle valve opening using the manipulated variable as a main variable; an actual opening detecting means for detecting the actual opening of the throttle valve; A deviation calculating means for calculating the deviation from the opening degree, a clutch detecting means for detecting whether the clutch is disengaged or engaged, a driving direction determining means for determining whether the driving direction of the throttle valve is the opening direction or the closing direction, and the above-mentioned The control amount is calculated according to the results of the actual opening detection means, the deviation calculation means, the clutch detection means, and the driving direction determining means. In particular, when the clutch is engaged and the driving direction is the opening direction, the actual opening is calculated. control amount calculation means for calculating a controlled amount having a characteristic of reducing the drive speed of the throttle valve in a range where the actual opening is less than a predetermined value and increasing the drive speed in a range where the actual opening is larger than the predetermined value; A vehicle throttle control device comprising: a drive means for driving a throttle valve in accordance with the present invention.