KR19980017087A - Impact control method during kick down of automatic transmission vehicle - Google Patents

Abstract

The present invention is to prevent the sudden increase of the engine RPM when the throttle valve is opened a lot by the accelerator pedal to improve the ride comfort so that the damper clutch operation is released smoothly, according to the throttle opening amount and the engine RPM of the damper clutch operation Reading an accelerator pedal open state to determine a kick down in an automatic transmission vehicle having an on / off variable; Comparing and determining whether the accelerator pedal opening angle is equal to or greater than a set reference value; And a step of outputting a throttle valve open perception signal to prohibit a sudden increase in engine RPM when the opening angle of the accelerator pedal is detected to be greater than or equal to a predetermined reference value.

Description

Impact control method during kick down of automatic transmission vehicle

1 is a block diagram of a damper clutch solenoid valve driving device of an automatic transmission vehicle,

(A) and (b) of FIG. 2 are output waveform diagrams of signals for controlling the damper clutch solenoid valve,

3 is a flowchart illustrating a method for controlling an impact during kick down of an automatic transmission vehicle according to an exemplary embodiment of the present invention.

[Industrial use]

The present invention relates to a shock control method when kicking down (K / D) of an automatic transmission vehicle, and more particularly, a damper clutch (damper) by prohibiting a sudden increase in engine RPM when kicking down to obtain a large driving force. The present invention relates to an impact control method when kicking down an automatic transmission vehicle so as to reduce the impact by smoothly releasing the clutch.

[Prior art]

Referring to (b) of FIG. 1 of the control operation of the damper clutch used to improve the power transmission efficiency and improve fuel economy, the following description will be made.

When the driver kicks down to obtain a large driving force, the opening amount of the throttle valve 120 is rapidly increased according to the opening angle of the accelerator pedal 110, and the engine RPM is rapidly increased to release the damper clutch. .

In detail, in the automatic shift control unit 140 that receives the signal detected by the throttle position sensor 131 and the signal detected by the ignition coil 132, the position on the damper clutch operating area map previously input to the ROM is determined. The calculation result is a damper clutch non-operation area, and a release signal is output to the damper clutch solenoid valve 150.

The release signal described above has a structure in which on / off is varied at one instant as shown in FIG.

In this way the damper clutch is released upon kickdown.

[Problem to solve the present invention]

However, when the damper clutch is operated as shown in FIG. 2 (b) as described above, the shock generated at the moment when the damper clutch is turned on and off is large and there is a problem that the engine RPM suddenly rises and the riding comfort is lowered.

The present invention has been made to solve the above problems, to prevent the sudden rise of the engine RPM when the opening of the accelerator pedal over a certain angle so that the damper clutch operation release signal is made smoothly to reduce the impact generated during release The purpose is.

[Means to solve the problem]

As a means for achieving the above object, the present invention, in the automatic transmission vehicle in which the damper clutch operation on / off is variable in accordance with the throttle opening amount and the engine RPM, the acceleration pedal opening state to read the determination of the kick-down Steps; Comparing and determining whether the accelerator pedal opening angle is equal to or greater than a set reference value; When the opening angle of the accelerator pedal is detected to be greater than or equal to the predetermined reference value in the comparison and determining step, the throttle valve opening perception signal is output to prohibit the sudden rise of the engine RPM.

EXAMPLE

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The apparatus of the present invention with reference to FIG. 1 includes a throttle valve 20 whose opening amount varies according to whether the accelerator pedal 10 is opened, and a throttle position sensor for detecting the opening degree of the throttle bab 20. 31), an ignition coil 32 for detecting engine RPM, and a signal of the accelerator pedal 10 are detected in advance, and when the threshold value is equal to or greater than a predetermined reference value, a perceptual signal is output to the throttle valve 20, and the throttle position sensor 31 is detected. And an automatic shift control unit 40 for reading a signal of the ignition coil 32 and outputting a signal for controlling damper clutch operation, and a damper clutch solenoid valve receiving a duty signal from the automatic shift control unit 40. It consists of 30.

To explain the operation with reference to FIG. 3, first, the automatic shift control unit 40 reads the open state of the accelerator pedal 10 (S10), and compares and determines whether the amount of change is greater than or equal to the set reference value (S20). .

When the accelerator pedal change amount is determined to be greater than or equal to the set reference value, an open perception signal is output to the throttle valve 20 (S31). When the accelerator pedal change amount is determined to be equal to or less than the set reference value, the throttle valve 20 may be operated in a normal state. Normal control signals are output (S32).

In addition, the opening degree of the throttle valve 20 sensed by the throttle position sensor 31 and the engine RPM detected by the ignition coil 32 are inputted to the automatic shift control unit 40, and the two values are determined by the automatic shift control unit 40. Determination of the operation / deactivation of the damper clutch by using the corresponding duty signal to the damper clutch solenoid valve 50.

If the driver wants to kick down, the information input from the accelerator pedal 10 determines that the opening degree is greater than the set reference value, and thus the automatic shift control unit 40 outputs an open perception signal to the throttle valve (S31).

The engine RPM output from the ignition coil 32 and the throttle opening amount output from the throttle position sensor 31 are combined to determine the damper clutch non-operation region, and the duty signal is determined by the damper clutch solenoid valve in FIG. The output will be smooth.

However, since the amount of change of the accelerator pedal read from the accelerator pedal 10 in the normal driving state is less than or equal to the set reference value, the normal control signal is output to the throttle valve 20 (S32).

At this time, the duty signal output to the damper clutch solenoid valve 50 by combining the engine RPM output from the ignition coil 32 and the throttle opening amount output from the throttle position sensor 31 is made as shown in FIG.

[Effects of the Invention]

Therefore, when the throttle valve is opened at a moment by the accelerator pedal, the automatic shift control unit detects this first and outputs a signal to perceive the opening of the throttle valve to prohibit the sudden increase of the engine RPM, thereby smoothly releasing the damper clutch. The ride comfort is improved by mitigating the shock caused by the damper clutch deactivation.

Claims (2)

In an automatic transmission vehicle in which the damper clutch operation is turned on or off according to the throttle opening amount and the engine RPM, Reading the accelerator pedal open state to determine a kick down; Comparing and determining whether the accelerator pedal opening angle is equal to or greater than a set reference value; And outputting a throttle valve open perception signal to prohibit the sudden rise of the engine RPM when the opening angle of the accelerator pedal is detected to be greater than or equal to a predetermined reference value in the comparison determination step. The method according to claim 1, wherein when the amount of change in the accelerator pedal is equal to or less than the setting reference value And a normal control signal is outputted so that the throttle valve can be generally operated.