JP2853398B2 - Engine throttle opening control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a throttle opening of an engine.

[0002]

2. Description of the Related Art There is a device that converts an operation amount of an accelerator into an electric signal and drives an engine throttle valve using an actuator such as a servomotor based on the signal.

There is also a device in which a throttle valve is mechanically connected to an accelerator and driven, and the opening characteristic of the throttle valve is varied by changing a lever ratio of the throttle using an actuator.

Such a device can easily realize a traction control system or the like for preventing a vehicle drive wheel from slipping (Japanese Patent Laid-Open No. 58-155235, 59-29).
No. 750, No. 60-173327, No. 60-259737
No. 61-89948).

[0005]

However, such an apparatus cannot cope with the deterioration of the throttle mechanism over time.

That is, in the case of driving a throttle valve using an actuator, a target throttle valve opening is calculated based on the operation amount of an accelerator, and the difference between the target opening and the actual opening of the throttle valve at that time is calculated. By driving the actuator based on it, the opening of the throttle valve is controlled,
In this case, if there is deterioration over time, an error occurs in the opening of the throttle valve, and good control cannot be obtained.

[0007] Further, for a variable throttle valve opening characteristic, a target throttle valve opening and a target throttle lever ratio are calculated based on the accelerator position and other operating conditions.
By driving the actuator based on the target opening and lever ratio, the required opening and opening characteristics of the throttle valve can be obtained. However, if there is deterioration over time, good control cannot be obtained.

For this reason, the operability gradually deteriorates with the aging deterioration.

An object of the present invention is to solve such a problem.

[0010]

According to a first aspect of the present invention, as shown in FIG.
A throttle opening control device for switching the opening / closing drive of the throttle valve 11 or an opening characteristic of the throttle valve 11; a means 12 for detecting an actual opening of the throttle valve 11; a means 13 for calculating a target opening of the throttle valve 11; An initial drive means for actuating the actuator when the opening is changed, and a small opening based on the detected opening when the difference between the target opening and the detected opening is greater than or equal to a predetermined value after the operation. Control value setting means 15 for selecting a control value that is sometimes small and gradually reducing the control value, and correction driving means 16 for operating the actuator 10 according to the gradually reduced value are provided.

A second aspect of the present invention relates to a throttle opening degree control device for an engine, which uses an actuator 20 to open and close a throttle valve 21 or switch the opening characteristic of the throttle valve 21 as shown in FIG.
Means for detecting the actual opening of the throttle valve, means for calculating the target opening of the throttle valve, and a difference between the target opening and the detected opening multiplied by a correction coefficient to obtain the operation value of the actuator. Operating value calculating means 24; and driving means 25 for operating the actuator 20 according to the operating value.
And a learning means 26 for correcting and learning the correction coefficient from the operation result.

[0012]

According to a first aspect of the present invention, after the actuator is initially operated,
If the difference between the target opening of the throttle valve and the detected opening is equal to or more than the predetermined value, a smaller control value is set for a smaller opening based on the detected opening, and a larger control is set for a larger opening based on the detected opening. By selecting the value and gradually decreasing the control value, the operation amount of the actuator is sequentially determined and the actuator is operated.

Therefore, the opening degree and opening characteristics of the throttle valve as required can be obtained irrespective of deterioration with time.

The second invention learns the previous operation result based on the difference between the target opening of the throttle valve and the detected opening,
Determine the operation value of the actuator this time and operate.

Therefore, the opening degree and opening characteristics of the throttle valve as requested can be obtained quickly.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows the operation of a throttle valve using an actuator.

In FIG. 3, reference numeral 30 denotes an accelerator pedal depression angle sensor which detects the actual depression angle of the accelerator pedal based on the output voltage of a potentiometer.

A throttle valve opening sensor 31 detects an actual opening of a throttle valve 33 provided in an intake passage 32 of the engine. Reference numeral 34 denotes a rotation sensor (crank angle sensor) for detecting the number of rotations of the engine.

The detection signals from the sensors 30, 31, and 34 are input to a control unit 35 comprising a microcomputer. The control unit 35 determines a target throttle valve opening based on these signals, and a servo motor 36 as an actuator.
Operate.

Reference numeral 37 denotes an engine spark plug;
Is a fuel injector.

Next, the control contents of the control device 35 (for the target opening calculating means, initial driving means, control value setting means and correction driving means) will be described with reference to the flowchart of FIG.

First, when the depression angle of the accelerator pedal changes,
In step 51, the current throttle valve opening So is read, and in step 52, the target opening Sp is calculated from the depression angle of the accelerator pedal.

Then, in step 53, the number of control times n is set to 1
Set, determine the actuator operation amount A ₁ from the predetermined data table as basis Figure 5 to the difference between the target opening Sp and the current throttle valve opening So at step 54, at operation amount A ₁ in step 55 The servo motor 36 is operated.

After this operation, the throttle valve opening S is read in step 56, and in step 57, the difference (absolute difference) between the target opening Sp and the throttle valve opening (detection opening) S is set to a predetermined value ε. Compare.

In this case, if there is no error in the operation of the throttle valve 33 due to aging or the like, the throttle valve opening S is controlled to the target opening Sp by the operation of the servo motor 36, and the opening difference becomes larger than the predetermined value ε. Therefore, the process is terminated.

On the other hand, the target opening Sp and the throttle valve opening S
If the difference is equal to or more than the predetermined value ε, the process proceeds to step 58 and the control count n is updated. Then, in step 59, it is determined whether the throttle valve opening S is larger or smaller than the target opening Sp.

If the throttle valve opening S is smaller than the target opening Sp, the opening is insufficient, and the actuator operation amount An (the above-described A
Calculating ₁ and the same direction), is greater than the target opening degree Sp, since opening is excessive, the actuator operation amount for correcting the excessive Step 61 An (the aforementioned A ₁
And the opposite direction).

In this case, according to the throttle valve opening S,
As shown in FIG. 6, a control value C (S) is read from a data table which is determined to take a smaller value as the opening S is smaller and a larger value in a series as the opening S is larger, and to read the control value C (S). , The forward and reverse actuator operation amount An is obtained.

FIG. 7 shows the opening degree S of the throttle valve 33.
The effect of the change on the drivability indicates that when the opening degree S is small, the effect on the drivability is large even if the change in the opening degree is small, and when the half-side opening degree S is large, the change in the opening degree is large. However, the influence on drivability is small. That is, a smaller control value C (S) is set in consideration of the influence on drivability as the opening degree S is smaller, and a larger control value C (S) is set in order to speed up the correction when the opening degree S is larger. I do.

When the operation amount An is obtained, the servo motor 36 is operated to correct the operation amount An in step 62.

After this operation, the throttle valve opening S is read in step 56, and if the difference between the target opening Sp and the throttle valve opening S falls within a predetermined value ε in step 57, the process is terminated. If the difference between the target opening Sp and the throttle valve opening S is equal to or larger than the predetermined value ε, the process proceeds to step 58 again, and
The control number n is updated, and the above-described processing is repeated.

The reason why the control value C (S) is divided by the control number n is that the throttle valve opening S approaches the target opening Sp each time the servo motor 36 performs a correction operation.

With this configuration, when the target throttle valve opening is changed by operating the accelerator pedal, the operation amount A ₁ is obtained from the difference between the target opening and the current throttle valve opening, and the servo of the throttle valve 33 is calculated. The motor 36 is operated. If there is a difference between the target opening and the throttle valve opening after the operation that is equal to or more than a predetermined value, the servo motor 36 is operated to correct.

That is, in this case, when the throttle valve opening is small, a small control value is selected, and when the throttle valve opening is large, a large control value is selected (see FIG. 6). Is gradually reduced to obtain the corrected operation amount An, and the servo motor 36 is operated. FIG. 8 shows a state in which the throttle valve opening is corrected to the target opening.

Therefore, even if there is a deterioration over time, the throttle valve 33 is accurately driven and controlled to the target opening.
When the throttle valve opening is large, the correction can be accelerated, and when the throttle valve opening is small, the correction does not adversely affect the operability, and suitable opening control can be ensured.

Therefore, a proper accelerator response can always be obtained, and the drivability is improved. In addition, when this apparatus is applied to a traction control system or the like, high-precision and good control can be ensured.

FIG. 9 is a flowchart for learning control of the operation of the servomotor. The mechanical configuration is the same as that of the example shown in FIG. 3, and the control device (20) includes a target opening calculating means, an operating value. It constitutes a calculating means and a learning means.

First, at step 71, the correction coefficient K (initial value is 1) stored in the memory is read.
Then, the target opening B is calculated from the depression angle of the accelerator pedal.

Next, at step 73, the difference between the target opening B and the current throttle valve opening Bo is multiplied by a correction coefficient K to obtain a parameter C. At step 74, the parameter C is determined based on the parameter C as shown in FIG. The actuator operation amount A is read from the data table.

Then, in step 75, the servo motor 36 is operated with the operation amount A.

After this operation, the throttle valve opening S is read in step 76, and in step 77, the throttle valve opening S is divided by the difference between the target opening B and the throttle valve opening Bo before operation. A new correction coefficient K is obtained, and is updated to the previous value in step 78.

In this way, if there is a difference between the target opening B and the throttle valve opening after the servomotor 36 is operated, the correction amount of the operation amount A corresponding to the difference is learned, and the learning is performed at the next operation. The operation amount A is corrected and calculated using the correction coefficient K later.

Therefore, the drive of the throttle valve 33 can always be controlled to the target opening, and proper opening control can be performed regardless of deterioration with time.

FIGS. 11 and 12 show that the opening characteristic of the throttle valve is made variable by changing the lever ratio of the throttle, and FIG. 13 is a flow chart showing the control contents.

A return spring 102 for urging the throttle valve 100 in a closing direction is wound around a throttle shaft 101 that supports the throttle valve 100 so as to be freely rotatable, and a driving lever (second lever) 103. Is fixed.

At the tip of the throttle shaft 101, a fan-shaped throttle drum 104 is rotatably mounted.
A first lever 105 is provided on one of the throttle drums 104.

The throttle drum 104 is provided with a peripheral groove 1.
When an accelerator wire from an accelerator pedal is wrapped around 06 and the accelerator pedal is depressed, it is turned according to the amount of depression.

The intermediate lever 108 interposed between the first and second levers 105 and 103 has a short cylindrical bearing 10.
9 is rotatably supported by being fitted into a guide ring 112 at the tip of a rod 111 of an actuator 110, and has elongated holes 113, 1 at both ends of a lever 108 which differ by 180 °
14 is engaged with pins 115 and 116 at the tips of the first and second levers 105 and 103, respectively.

The actuator 110 reciprocates the rod 111 by changing the rotational motion of the motor into a linear motion.
08 slides and its rotation center is displaced on a straight line passing through the center of the throttle shaft 101.

Accordingly, the depression amount of the accelerator pedal is transmitted from the first lever 105 of the throttle drum 104 to the throttle valve 100 from the second lever 103 via the intermediate lever 108, and the actuator 11
By setting the amount of eccentricity of the intermediate lever 108 by the operation of the throttle valve 0, the lever ratio of the throttle changes, and the throttle valve 1
The required opening characteristics of 00 are obtained.

Next, control contents will be described.

In this case, although the configuration of the control system is not shown,
As in the example of FIG. 3, an accelerator pedal depression angle sensor, a throttle valve opening sensor, a rotation sensor, a load sensor, a vehicle speed sensor, and the like for detecting the operating conditions of the engine are provided. The driving unit, the control value setting unit, and the correction driving unit are configured.

As shown in FIG. 13, at step 121, the depression angle α of the accelerator pedal is read, and at step 122, the target opening β is calculated based on the depression angle α of the accelerator pedal and the operating conditions of the engine.

Next, at step 123, the target lever ratio γ of the throttle is calculated according to the target opening degree β with respect to the accelerator pedal depression angle α, and at step 124, the moving distance e of the intermediate lever 108 is calculated from the target lever ratio γ. Ask for.

[0056] Then, set to 1 the control number n at step 125, it determines the operation amount A ₁ of the actuator 110 from the moving distance e of the intermediate lever 108 at step 126, at operation amount A ₁ in step 127 the actuator 1
Activate 10

However, if the target lever ratio γ does not change from the current lever ratio, the moving distance e of the intermediate lever 108 is 0.
And the actuator operation amount A ₁ = 0.

Then, at step 128, the throttle valve 1
At step 129, the difference (absolute difference) between the target opening β and the throttle valve opening S is compared with a predetermined value ε.

At this time, if there is no error due to aging or the like, the throttle valve opening S is controlled to the target opening β, and the opening difference becomes smaller than the predetermined value ε.

On the other hand, when the difference between the target opening β and the throttle valve opening S is equal to or larger than the predetermined value ε, the routine proceeds to step 130 and thereafter, the number of controls n is updated, and in step 131 the throttle valve opening S is It is determined whether it is larger or smaller than the target opening degree β.

If the throttle valve opening S is smaller than the target opening β, the opening is insufficient, and in step 132, an actuator operation amount An for correcting the shortage is calculated.
If the opening degree is larger than the target opening degree β, the opening degree is excessive, so that the actuator operation amount An for correcting the excessive degree is calculated in step 133.

In this case, according to the throttle valve opening S,
As shown in FIG. 6, the control value C (S) is read from a data table in which the smaller the opening S is, the smaller the value is. Determine the quantity An.

When the actuation amount An is obtained, the actuator 110 is corrected by the actuation amount An in step 134. After the actuation, the throttle valve opening S is read in step 128, and the target opening β is determined in step 129. If the difference between the throttle valve opening S is within the predetermined value ε, the process is terminated. If the difference between the target opening β and the throttle valve opening S is equal to or more than the predetermined value ε, the process proceeds to step 130 again. , The control count n is updated, and the above-described processing is repeated.

In such a configuration, when the target throttle valve opening changes according to the operation of the accelerator pedal or operating conditions, the actuator 110 is operated so as to obtain the target opening and the target lever ratio. If there is a difference between the predetermined value and the throttle valve opening degree, the actuator 11
0 is corrected.

This correction operation is basically the same as the control shown in FIG. 4; a small control value is selected when the throttle valve opening is small, and a large control value is selected when the throttle valve opening is large.
This is gradually reduced every time to obtain a corrected operation amount An.
The actuator 110 is operated.

Therefore, when the throttle valve opening is large, the correction can be accelerated. When the throttle valve opening is small, the correction does not adversely affect the driving performance. It is possible to precisely control the target opening and obtain the required opening characteristics.

When applied to a traction control system or the like, high-precision control can be ensured.

The operation of the actuator 110 may be controlled by learning the operation result of the actuator 110 with respect to the target value, similarly to the example of FIG.

[0069]

As described above, according to the first aspect, when the difference between the target opening of the throttle valve and the detected opening is equal to or larger than a predetermined value, the smaller the opening based on the detected opening, the smaller the opening. Select the control value and gradually reduce the control value to obtain the operation amount,
Since the actuator is operated in a corrective manner, the required opening degree and opening characteristics of the throttle valve can be ensured regardless of deterioration over time, so that drivability is improved and high reliability of the throttle can be obtained.

According to the second aspect of the present invention, since the operation of the actuator is learned and controlled, the opening degree and the opening characteristics of the throttle valve can be controlled accurately and promptly with respect to aging, and high drivability can be obtained. , Reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the present invention.

FIG. 2 is a configuration diagram of the present invention.

FIG. 3 is a configuration diagram of a throttle valve direct acting type.

FIG. 4 is a flowchart showing the control contents.

FIG. 5 is a characteristic diagram showing a data table of an actuator operation amount.

FIG. 6 is a characteristic diagram showing a data table of control values.

FIG. 7 is an explanatory diagram showing the degree of influence on drivability due to a change in the opening degree.

FIG. 8 is an explanatory diagram showing an operation of correcting an opening.

FIG. 9 is a flowchart showing control contents of another embodiment.

FIG. 10 is a characteristic diagram showing a data table of an actuator operation amount.

FIG. 11 is a structural view of a variable lever ratio type.

FIG. 12 is an exploded perspective view of a variable lever ratio type.

FIG. 13 is a flowchart showing the control contents.

[Explanation of symbols]

 Reference Signs List 30 Accelerator pedal depression angle sensor 31 Throttle valve opening sensor 33 Throttle valve 35 Controller 36 Servo motor 100 Throttle valve 103 Second lever 105 First lever 108 Intermediate lever

Continuation of the front page (56) References JP-A-62-135629 (JP, A) JP-A-61-89949 (JP, A) JP-A-61-89948 (JP, A) JP-A-60-259737 (JP, A) JP-A-60-173327 (JP, A) JP-A-59-29750 (JP, A) JP-A-58-155235 (JP, A) JP-A-4-292547 (JP, A) 3-37340 (JP, A) JP-A-61-152933 (JP, A) JP-A-1-159151 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02D 41/14 320 F02D 9/02 351 F02D 11/10 F02D 45/00 322

Claims (2)

(57) [Claims] A throttle opening control device for an engine for switching the opening / closing drive of a throttle valve or switching the opening characteristics of a throttle valve using an actuator, a means for detecting an actual opening of the throttle valve, and a target opening of the throttle valve. Means for calculating, initial drive means for operating the actuator when the target opening is changed, and, based on the detected opening when the difference between the target opening and the detected opening after this operation is equal to or greater than a predetermined value. An engine throttle, comprising: control value setting means for selecting a smaller control value as the opening degree is smaller and gradually decreasing the control value; and correction driving means for operating the actuator according to the gradually decreased value. Opening control device. 2. A throttle opening control device for an engine, which switches an opening / closing drive of a throttle valve or switches an opening characteristic of the throttle valve by using an actuator, means for detecting an actual opening of the throttle valve, and a target opening of the throttle valve. Calculating means, operating value calculating means for multiplying the difference between the target opening and the detected opening by a correction coefficient to obtain an operating value of the actuator, driving means for operating the actuator according to the operating value, A throttle opening control device for an engine, further comprising learning means for correcting and learning the correction coefficient from an operation result.