JP3090162B2 - Linkless throttle 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 throttle valve opening control device for a motor vehicle, and more particularly to a so-called linkless throttle control device in which an accelerator pedal and a throttle valve are not mechanically connected.

[0002]

2. Description of the Related Art It is well known that a throttle valve provided in an intake passage is provided as a means for adjusting the output of an internal combustion engine of an automobile, and the amount of air taken into the engine is adjusted by adjusting the opening degree. . In general, the throttle valve is mechanically connected to a so-called accelerator pedal. In this case, the depression amount of the accelerator pedal and the opening degree of the throttle valve are uniquely determined. The throttle valve is coupled so as to be proportional to the throttle valve opening.

[0003]

However, when the speed ratio of the transmission changes in a decreasing direction, that is, when the upshift is performed, the relationship between the depression amount of the accelerator pedal and the throttle valve opening is uniform. The torque decreases once and the acceleration decreases. FIG. 6 is a graph showing an example of a running characteristic diagram of an automobile, in which the horizontal axis represents time and the vertical axis represents torque.

[0004] The running characteristics of the conventional throttle control device are indicated by broken lines. When the speed ratio decreases at time t ₀ , the torque suddenly decreases and then gradually increases. For this reason, drivability is impaired, especially in the case of overtaking, and the driving sensation of the driver is deteriorated. SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a linkless throttle control device that does not impair the feeling of acceleration even when the transmission is upshifted.

[0005]

FIG. 1 is a basic block diagram of a linkless throttle control device according to the present invention. The step-amount detecting means 110 for detecting the step-amount of an accelerator pedal, and the speed ratio of a transmission are determined. Speed ratio decrease detecting means 120 for detecting the change in the decreasing direction; reference throttle valve opening determining means 130 for determining the reference throttle valve opening as a function of the accelerator pedal depression amount detected by the depression amount detection means 110; , Gear ratio decrease detecting means 12
When the speed change ratio of the transmission is decreased in a direction 0, it is determined by the reference throttle valve opening determining means 130 in accordance with the increase rate of the accelerator pedal depression amount detected by the depression amount detection means 110. The corrected throttle valve opening determining means 140 for determining the corrected throttle valve opening to increase the corrected reference throttle valve opening, the reference throttle valve opening determined by the reference throttle valve opening determining means 130 and the corrected throttle valve opening. Degree determination means 1
And a throttle valve driving means 150 for driving the throttle valve to a throttle valve opening determined from the corrected throttle valve opening determined by the control unit 40.

[0006]

In the linkless throttle control device according to the present invention, when the speed ratio of the transmission changes in the decreasing direction,
The rate of increase of the throttle valve opening becomes larger than the rate of increase of the accelerator pedal depression amount, so that the torque is reduced immediately after the change of the gear ratio, and the acceleration is prevented from being reduced.

[0007]

FIG. 2 is a hardware configuration diagram of a linkless throttle control device according to an embodiment of the present invention. Air for combustion is supplied to an internal combustion engine 21 through an intake pipe 22. The amount of the combustion air supplied to the internal combustion engine is adjusted by adjusting the opening of a throttle valve 23 installed in the middle of the intake pipe.

In the present invention, the throttle valve 23 is driven by a step motor 24 directly connected to a throttle valve shaft. The step motor 24 constitutes a throttle valve driving means 150. Further, the depression amount of the accelerator pedal 25 is detected by a depression amount detection sensor 26 which is, for example, a potentiometer.

The depression amount detecting sensor 26 constitutes a depression amount detecting means 110. The depression amount detection sensor 26 and the step motor 24 are connected to a control device 27 configured as, for example, a microcomputer system. In addition, for example, 3
A switch for transmitting a pulse for each 0-degree cam angle is provided, and a pulse output from this switch is also input to the control device 27.

The control device 27 controls the bus 271
PU 272, memory 273, input interface 27
4 and an output interface 275. The depression amount sensor 26 and the vehicle speed sensor 28 are connected to the input interface 274 as analog signals. Further, the input interface 274 is connected to a transmission ratio changeover switch 29 of the transmission and a switch provided in the distributor 291 as digital signals.

A step motor 24 is connected to the output interface 275. FIG. 3 is a flowchart of a throttle control routine executed by the control device 27. The throttle control routine is executed, for example, at a predetermined cam angle or at regular intervals in synchronization with a pulse output from a switch provided in the distributor 291. . Read depression amount TA _i of the accelerator pedal at step 301.

In step 302, a deviation ΔTA from an accelerator pedal depression amount TA _OLD during a gear upshift is calculated. Calculating a reference throttle valve opening command TH _B as a function of the depression amount TA _i of the accelerator pedal at step 303. In step 304, it is determined whether a predetermined time, for example, two to three seconds has elapsed after the gear upshift.

If a negative determination is made in step 304,
In step 305, the corrected throttle valve opening ΔTH is set to “0”.
And the process proceeds to step 307. Step 304
If the determination in step 306 is affirmative, the deviation ΔTA
Then, the corrected throttle valve opening ΔTH is calculated as a function of, and the routine proceeds to step 307. Step 307 In the reference throttle valve opening command TH _B by adding the correction throttle valve opening ΔTH seek throttle valve opening command TH by.

In step 3081, it is determined whether or not the vehicle is immediately after a gear upshift.
Replacing the depression amount TA _OLD of accelerator pedal depression amount TA _i of the accelerator pedal 082. Step 3
At step 09, a throttle valve opening command TH is output to adjust the opening of the throttle valve 23.

FIG. 4 is an example of a shift diagram, in which the horizontal axis represents the speed and the vertical axis represents the throttle valve opening command TH. When the point determined from the speed and the throttle valve opening command TH crosses the shift curve in the speed increasing direction, it is determined that there is a gear upshift, and an affirmative determination is made in step 304.

FIG. 5 is a graph showing an example of a function used in the throttle control routine. FIG. 5A is a graph for obtaining a reference throttle valve opening command TH, and FIG.
Is a graph for obtaining the throttle valve opening TH after correction. (A) shows the accelerator pedal depression amount T on the horizontal axis.
The A _i, taking the throttle valve opening command TH criteria ordinate.

[0017] That reference throttle valve opening command TH of is determined as proportional to the depression amount TA _i of the accelerator pedal. In (b), the horizontal axis represents the change ΔTA in the amount of depression of the accelerator pedal after the gear upshift, and the vertical axis represents the corrected throttle valve opening TH. That is, if the change ΔTA in the amount of depression of the accelerator pedal is equal to or less than a predetermined threshold, the throttle valve opening TH after the correction of the increase rate of the amount of depression
Increase the rate of increase.

Conversely, the change ΔT in the depression amount of the accelerator pedal
If A is equal to or greater than the predetermined threshold, the increase rate of the corrected throttle valve opening TH is made smaller than the increase rate of the depression amount. Therefore, after the gear upshift, the rate of increase in the opening of the throttle valve increases with an increase in the amount of depression of the accelerator pedal, and a decrease in the sense of acceleration due to a temporary decrease in torque is suppressed.

That is, it is possible to obtain the running characteristics indicated by the solid line in the running characteristics graph shown in FIG.

[0020]

According to the linkless throttle control device of the present invention, when the gear ratio of the transmission is changed and it is determined that the gear is upshifted, the throttle valve opening degree is increased with respect to the increase rate of the accelerator pedal depression amount. By increasing the rate of increase in the torque, it is possible to suppress a decrease in the feeling of acceleration due to a drop in torque after a gear upshift.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a linkless throttle control device.

FIG. 2 is a hardware configuration diagram of an embodiment of a linkless throttle control device.

FIG. 3 is a flowchart of a throttle control routine.

FIG. 4 is a graph showing an example of a shift diagram.

FIG. 5 is a graph showing an example of a function used in a throttle control routine.

FIG. 6 is a graph showing an example of running characteristics of an automobile.

[Explanation of symbols]

 110: Depressed amount detecting means 120: Gear ratio decrease detecting means 130: Reference throttle valve opening determining means 140: Corrected throttle valve opening determining means 150: Throttle valve driving means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02D 9/00-11/10 F02D 29/00 F02D 41/00-45/00 395

Claims (1)

(57) [Claims] 1. A depression amount detecting means (110) for detecting an amount of depression of an accelerator pedal; a speed ratio decrease detecting means (120) for detecting that a transmission ratio of a transmission has changed in a decreasing direction; A reference throttle valve opening determining means (130) for determining a reference throttle valve opening as a function of the accelerator pedal depression amount detected by the detecting means (110); and a speed change of the transmission by the speed ratio decrease detecting means (120). When it is detected that the ratio has changed in the decreasing direction, the reference throttle valve opening degree determining means (130) determines the ratio in accordance with the increase rate of the accelerator pedal depression amount detected by the depression amount detecting means (110). A corrected throttle valve opening determining means (140) for determining a corrected throttle valve opening for increasing the corrected reference throttle valve opening; The throttle valve is driven to a throttle valve opening determined by the throttle valve opening determined by the tor valve opening determining means (130) and the corrected throttle valve opening determined by the corrected throttle valve opening determining means (140). And a throttle valve driving means (150).