KR20080028151A - Shifting control device and its method - Google Patents

Abstract

A shifting control device of an automatic transmission and a controlling method of the same are provided to perform stably a shifting operation by controlling an RPM(Revolution Per Minute) of an engine in an upshifting process. A traveling state sensing unit(10) receives a signal changed according to a traveling state of a vehicle, and outputs a corresponding electrical signal. An engine control unit(20) receives an output signal from the traveling state sensing unit in order to determine an upshifting state. A shifting control unit(30) outputs an initial duty control signal of a gradient ramp1 stored in a memory when the engine control unit generates an upshift signal. The shifting control unit outputs a duty control signal of a gradient ramp2 larger than the gradient ramp1 in a maximum shift start time. The shifting control unit compensates the initial duty control signal of the gradient ramp1 stored in the memory when an RPM is more than a red zone. A shift driving unit(40) changes a shift stage to a corresponding shift stage according to the duty control signal.

Description

Shift control device of automatic transmission and its control method {SHIFTING CONTROL DEVICE AND ITS METHOD}

1 is a shift control duty pattern diagram during an upshift shift of an automatic transmission according to the prior art;

2 is a block diagram of an automatic transmission shift control apparatus according to the present invention;

3 is a shift control duty pattern diagram during upshift shifting of an automatic transmission according to the present invention;

4 is a flowchart illustrating a control method of a shift control apparatus of an automatic transmission according to the present invention.

<Explanation of symbols on main parts of the drawings>

10: driving state detection unit 11: throttle valve opening amount detection unit

12: vehicle speed detection unit 13: turbine rotation speed detection unit

14 engine speed detection unit 20 engine control device

30: shift control unit 40: shift drive unit

SMT: Maximum shift start time SSS: Actual shift start point

The present invention relates to a shift control method of an automatic transmission, and more particularly, to a shift control method of an automatic transmission that prevents the engine speed from being excessively increased and above the red zone speed during the upshift shift.

In general, an automatic transmission applied to a vehicle controls a hydraulic pressure by controlling a plurality of solenoid valves according to a traveling speed of a vehicle, an opening ratio of a throttle valve, and various detection conditions, so that a gear shift of a target shift stage is operated. The shift is made automatically.

In other words, when the driver switches the select lever to the desired shift range, the manual valve port is changed and the hydraulic pressure supplied from the oil pump is selectively operated according to the duty control of the solenoid valve. Let this be done.

The automatic transmission operated according to this operating principle has a friction element that is deactivated in the operating state when the shift to the target shift stage is performed, and a friction element that is converted from the deactivation state to the operating state. Since the shift performance of the automatic transmission is determined according to the deactivation and start timing of these friction elements, the research on the shift control method for improving the shift performance has been actively conducted in recent years.

In view of the technical background of the present invention, in the case of a vehicle equipped with an automatic transmission, if the throttle valve is set to 100% for acceleration during driving, 1-2 shifts are made.

At this time, the engine speed may be greater than or equal to the red zone due to the hydraulic deviation between the vehicles at 1-2 shifts.

As shown in FIG. 1, when the engine speed is greater than or equal to the red zone, the engine control unit ECU of the vehicle may rotate the engine speed by setting the opening rate of the throttle valve or stopping the supply of fuel as a safety measure. Do not let more than a number.

If the above phenomenon occurs, the current transmission will display a FAIL-SAFE CODE that the 1-2 shift is not completed, and the engine check light is lit to inform the driver.

However, the shift control method of the automatic transmission according to the prior art configured as described above has a problem that the engine does not become shifted when the driver desires it and the engine speed becomes more than the red zone speed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shift control apparatus and a control method of an automatic transmission in which a shift is made at a desired point in time of the driver and the engine rotation speed does not become greater than the red zone rotation speed.

The present invention is a driving state detection unit for receiving a signal that is output by varying the state of the vehicle according to the driving state of the vehicle and outputs a corresponding electric signal; An engine controller configured to receive a signal output from the driving state detecting unit and determine whether to shift upshift; The engine control unit outputs an initial duty control signal of a ramp1 slope stored in a memory when an upshift shift signal is generated, and when a maximum shift start time set in the memory is reached from the upshift shift signal, a ramp2 slope greater than the ramp1 slope is reached. A shift control unit for outputting a duty control signal and correcting an initial duty control signal of a ramp 1 slope stored in the memory when the engine speed exceeds the red zone engine speed in the shifting process; Provides a shift control apparatus of an automatic transmission including a shift driver for shifting a shift stage to a corresponding target shift stage by a duty control signal output from the shift control apparatus.

In addition, the present invention comprises the steps of determining whether the upshift shift for the vehicle in motion; Outputting an initial duty control signal of a ramp1 slope when an upshift shifting signal is generated in the determining of whether the upshift shifting is performed; Determining whether a maximum shift start time has been reached from the upshift shift signal; Outputting a duty control signal having a ramp2 slope greater than the ramp1 slope when the maximum shift start time is reached; A shift control method of an automatic transmission including a torque reduction control step of lowering an input torque is provided.

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

2 is a block diagram of an automatic transmission shift control apparatus according to the present invention, Figure 3 is a shift control duty pattern of the upshift shift of the automatic transmission according to the present invention, Figure 4 is an automatic transmission according to the present invention A flowchart showing a control method of the shift control apparatus.

A driving state detection unit 10 outputting a signal that varies according to the driving state of the vehicle; An engine control apparatus 20 which receives a signal output from the vehicle driving state sensing unit 10; When the shift is started by receiving a signal about the vehicle driving state from the engine controller 20, the shift shock is corrected by comparing the turbine rotational speed with the engine rotational speed to correct a certain amount of duty signal when the turbine rotational speed is lower than the engine rotational speed A shift control unit 30 which stops the output of all the duty signals after a predetermined time is found and the shift synchronization completion point is found; It consists of a shift drive unit 40 consisting of a solenoid valve for adjusting the hydraulic pressure in accordance with the duty control signal output from the shift control unit 30.

The driving state detection unit 10 includes a throttle valve opening amount detection unit 11 for detecting an opening degree of a throttle valve whose opening / closing state is changed according to the operation of the accelerator pedal and outputting a corresponding electric signal; A vehicle speed detector 12 which detects a speed of a driving vehicle and outputs a corresponding signal; A turbine rotation speed sensing unit 13 for sensing a rotation speed of the turbine side of the torque converter connected to the input side of the transmission and outputting a corresponding signal; The engine speed detection unit 14 detects the rotational speed of the crankshaft variable according to the operating state of the engine and outputs a corresponding signal.

Looking at the operation of the present invention configured as described above are as follows.

The driving state detector 10 detects a throttle valve opening amount, a vehicle speed, a turbine speed, an engine speed, and the like, and outputs a signal for the detected driving state to the engine controller 20 while the vehicle is running. (S100)

The shift control unit 30 determines whether the shift is upshifted based on the signal output from the driving state detecting unit 10 (S110).

When the upshift shift signal is generated by the shift control unit 30 to command an upshift shift, as illustrated in FIG. 3, the shift control unit 30 outputs an initial duty control signal of a ramp1 slope (S120).

The shift control unit 30 determines whether the maximum shift start time SMT stored in the shift control unit 30 memory is reached from the upshift shift signal.

If the maximum shift start time SMT is reached, the shift control unit 20 outputs a duty control signal having a ramp2 slope as shown in FIG. 3 (S140).

Further, as shown in FIG. 3, torque reduction control for lowering the input torque is executed (S160).

When the maximum shift start time SMT is not reached in the step of determining whether the maximum shift start time SMT has been reached, the shift controller 30 determines whether the actual shift start point SSS has been reached. )

The actual speed change start point (SSS) is obtained by measuring the turbine speed, and refers to the point at which the maximum turbine speed and the measured turbine speed are 30 rpm or less by measuring the turbine speed from the upshift shift signal.

If the actual speed change start point (SSS) is not reached, it is determined whether the maximum speed change start point (SMT) is reached again. If the actual speed change start point (SSS) is reached, the torque reduction control (S160) is executed. do.

After the torque reduction control step, it is determined whether the engine speed is greater than or equal to the red zone engine speed (S170).

If the engine speed is greater than or equal to the red zone engine speed, learning control is performed to correct the initial duty control signal so that the engine speed becomes less than or equal to the red zone engine speed at the next shift.

The automatic transmission control apparatus and the control method according to the present invention outputs a duty control signal of a ramp2 slope having a larger slope than the initial duty control signal of the ramp1 slope after a predetermined period from the upshift shift signal, thereby rotating the engine during upshift shifting. It is effective to prevent the number from exceeding the red zone engine speed.

Claims (5)

A driving state sensing unit which receives a signal that is varied in the state of the vehicle according to the driving state of the vehicle and outputs a corresponding electric signal; An engine controller configured to receive a signal output from the driving state detecting unit and determine whether to shift upshift; The engine control unit outputs an initial duty control signal of a ramp1 slope stored in a memory when an upshift shift signal is generated, and when a maximum shift start time set in the memory is reached from the upshift shift signal, a ramp2 slope greater than the ramp1 slope is reached. A shift control unit for outputting a duty control signal and correcting an initial duty control signal of a ramp 1 slope stored in the memory when the engine speed exceeds the red zone engine speed in the shifting process; And a shift drive unit configured to shift the shift stage to a corresponding shift stage by a duty control signal output from the shift control apparatus. Determining whether the shift is upshifted with respect to the vehicle being driven; Outputting an initial duty control signal of a ramp1 slope when an upshift shifting signal is generated in the determining of whether the upshift shifting is performed; Determining whether a maximum shift start time has been reached from the upshift shift signal; Outputting a duty control signal having a ramp2 slope greater than the ramp1 slope when the maximum shift start time is reached; A shift control method of an automatic transmission comprising a torque reduction control step of lowering an input torque. The method according to claim 2, Determining whether or not the actual shift start point is reached by measuring a change in turbine speed when the maximum shift start time has not been reached from the upshift shift signal; And a torque reduction control step of lowering an input torque when the actual shift start point is reached. The method according to claim 2, The actual shift start point in the step of determining whether the actual shift start point is reached is the point of time when the maximum turbine speed and the measured turbine speed are 30 rpm or less by measuring the turbine speed from the upshift signal. . The method according to any one of claims 2 to 4, Determining whether an engine speed is greater than or equal to a red zone engine speed after the torque reduction control step; And correcting the initial duty control signal when the engine speed is equal to or greater than the red zone engine speed after the torque reduction control step.

Images