KR20110011431A - Method for transminssing down shift before stop of vehicle - Google Patents

Abstract

PURPOSE: A down shift transmission method is provided to remove a run-down phenomenon by determining whether a run-down phenomenon is generated according to the rotational number of times of a turbine. CONSTITUTION: A turbine rotation number is monitored(103). It is determined whether a run-down determination condition is satisfied(105). An input side torque is controlled to be ascended(107). It is determined whether a run-down control termination condition is satisfied(113). The input side torque is controlled to be descended(115).

Description

TECHNICAL FOR TRANSMINSSING DOWN SHIFT BEFORE STOP OF VEHICLE}

The present invention relates to a method for improving the shifting feeling of downshift before stopping, and more particularly, to control down the rundown shape generated during downshift shifting during regenerative braking to improve shifting quality. It is about a shift shift method.

In general, the automatic transmission applied to a vehicle is a target shift stage from a shift map table in which a shift control device is set according to the driving speed of the vehicle, the opening ratio of the throttle valve, and various detection conditions (oil temperature, cooling water temperature, intake temperature, and air volume). After setting the gearbox by controlling a plurality of solenoid valves to control the hydraulic pressure of the gear shift gear of the target shift stage refers to the automatic shift.

The automatic transmission causes various types of shift shocks because the pressure supplied to the release element deactivated in the actuated state and the engaging element actuated in the deactivated state is not accurately synchronized when the shift to the target shift stage is executed. do. At this time, the determination of the occurrence of the shift shock is determined by looking at the rate of change of the turbine speed and the turbine speed.

That is, as shown in FIG. 1, the hydraulic pressure supplied to the release side element is supplied at a preset hydraulic duty value as the shift start (SS) is performed according to the downshift shifting request before stopping.

At this time, since the hydraulic duty value of the hydraulic release side element is rapidly reduced, a run down occurs when the turbine speed is lower than the reference speed when supplied. However, in the related art, a shift delay occurs due to the RUN DOWM phenomenon, and there is a problem in that the riding comfort decreases due to the shift delay.

Therefore, the present invention was created to solve the above problems, and an object of the present invention is to determine whether a rundown occurs according to the turbine speed received and to increase the input side torque when the rundown occurs to remove the rundown phenomenon and shift it. It is an object of the present invention to provide a method of shifting downshifts before stopping a vehicle that can eliminate delays and shift shocks, and further improve shift quality and durability by optimizing hydraulic duty of the release element.

 According to the technical problem of the present invention for achieving the above object,

Monitoring the turbine speed after receiving the downshift shift request before stopping;

Determining whether a rundown determination condition is subsequently satisfied at a shift start time point (SB) at which the actual shift is performed based on the turbine rotational speed;

Increasing control of the input side torque based on the input side torque, the target shift stage, and the slip amount when the run down determination condition is satisfied;

Determining whether the run down control termination condition is satisfied based on the turbine rotation speed and the turbine rotation rate change rate, and controlling the input side torque to fall down when the run down termination condition is satisfied;

Here, the run down determination condition is,

And when the difference between the turbine rotational speed and the turbine rotational speed before the shift start time is equal to or more than a predetermined value, it is determined that the rundown has occurred.

The input torque rise control is,

Increasing the input side torque by the input torque and the slip amount and the 대비 data value relative to the target transmission stage when the difference between the turbine rotation speed and the target turbine rotation speed corresponding to the shift stage is equal to or less than a predetermined value;

Then increasing the input side torque at a first predetermined slope set to a data value relative to the target shift stage;

Maintaining the input side torque with the input torque and slip amount and the data value compared to the target shift stage;

The run down control cancellation condition is,

The ratio between the difference between the turbine rotational speed and the turbine rotational speed at the end of the speed change and the turbine rotational speed and the turbine rotational speed change rate is less than or equal to the preset reference value.

In addition, the input torque reduction control,

Determining whether an input torque increase termination condition is satisfied based on the turbine rotation speed and the turbine rotation speed;

If the input torque rise cancellation condition is satisfied as a result of the determination, reducing the input torque by the input torque, the slip amount and the data value compared to the target shift stage; And

Subsequently, the input torque may be gradually decreased by a second predetermined slope set to a data value with respect to the target shift stage.

The downshift shifting method of the vehicle according to the present invention is controlled to increase the input side torque based on the slip amount, the target shift stage, and the input-to-torque torque data value when the run down determination condition is satisfied according to the turbine speed received. If the run down control cancellation condition is satisfied based on the turbine rotation speed and the turbine rotation speed change rate, the input torque reduction control is executed based on the slip amount, the target shift stage, and the data value of the input torque. By eliminating the phenomenon, it is possible to eliminate shift delays and shift shocks, and further, by optimizing the hydraulic duty of the release element, the shift quality and durability can be improved.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings that illustrate preferred embodiments of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a view showing the configuration of the present invention, the vehicle for controlling the overall operation of the automatic transmission according to the present invention, the driving information of the current vehicle from the various sensors provided from the engine control detection unit 11 engine control unit 13 ), The engine control unit 13 compares the information with pre-input data and controls the engine in an optimal state through the engine control driver 15.

In addition, if there is information necessary for shift control, the engine control unit 13 sends information to the shift control unit 17 to perform shift control, wherein the shift control unit 17 is supplied from the engine control unit 13. The shift control driver 21 is shifted to an optimal state by controlling the shift control driver 21 by comparing the information and the information input from the shift control detection unit 19 with previously stored data.

The engine control detection unit 11 detects all information necessary for engine control such as a vehicle speed sensor, a crank angle sensor, an engine speed sensor, a coolant temperature sensor, a turbine speed sensor, a throttle valve opening degree sensor, and the like, as known in the art. Supplied to the engine control unit 13, the shift control detecting unit 19 refers to sensors that provide information necessary for shift control such as an input / output side speed sensor, an oil temperature sensor, an inhibitor switch, a brake switch, and the like.

In addition, the engine control driving unit 15 means all driving units for engine control, and the shift control driving unit 21 includes a solenoid valve applied to hydraulic control means of an automatic transmission including a release side element and a coupling side element. It means.

The shift control unit 17 releases the release side element with a preset hydraulic duty pattern based on the turbine speed during the shift start time SB from the shift start time SS when the regenerative braking request is performed.

At this time, the shift control unit 17 determines whether the run down determination condition is satisfied based on the turbine rotation speed received during downshift shifting before stopping, and when the determination result satisfies the run down determination condition, the slip amount, the target shift stage, and The input side torque increase control is executed on the basis of the data value generated based on the input side torque, and it is determined whether the run down control termination condition is satisfied based on the turbine rotation speed and the turbine rotation speed change rate. Is satisfied, the input torque reduction control is executed on the basis of the slip amount, the target speed change stage, and the data value generated based on the input torque.

FIG. 3 is a waveform diagram showing an input torque control pattern during a rundown determination according to the present invention. As shown in FIG. 3, the input torque control includes a difference between a turbine speed and a target turbine speed corresponding to the shift stage. When the torque is less than the predetermined value, the input torque and the slip amount and the input torque increase rapidly with the data value TR1 compared to the target speed, and then the input torque with the first predetermined slope SA set as the data value with respect to the target speed. And increase the input torque and slip amount, and maintain the input torque at the data value TR2 compared to the target speed, and determine whether the run down control termination condition is satisfied based on the turbine speed and the turbine speed. If it is determined that the run-down control canceling condition is satisfied, the input torque, slip amount and the data value (TR3) It is performed to reduce the torque input side and grade, followed by gradually reducing the input torque to a second predetermined gradient (SR) is set as the target gear position than mep data value.

Here, the rundown determination condition is set to the difference between the turbine rotation speed NT and the turbine rotation speed NTI before a shift start time more than the predetermined value del NRC.

In addition, the run-down control termination condition is set to the ratio of turbine rotation speed NTJ turbine rotation speed change rate NI at the time of completion | finish of turbine rotation speed NT below the preset reference value tSYS.

4 is a flowchart illustrating a downshift shifting process before stopping a vehicle according to the present invention. The shifting process of the hybrid vehicle according to the present invention will be described with reference to the accompanying drawings.

First, the shift control unit 17 monitors the turbine rotation speed through step 103 in the case of downshift shifting before stop via step 101.

In addition, the shift control unit 17 determines whether the run down determination condition received through the step 103 is satisfied (step 105), and if the run down phenomenon occurs as a result of the determination, the slip amount through the step 107, The input side torque is rapidly increased by the target shift stage and the data value TR1 relative to the input side torque.

Subsequently, the shift control unit 17 increases the input side torque by the first predetermined inclination SA, which is a data value compared to the target shift stage, through step 109, and slips, the target shift stage, and the input side through step 111. The input side torque is maintained by the data value TR2 relative to the torque.

On the other hand, the shift control unit 17 determines whether the run down control cancellation condition is satisfied on the basis of the turbine rotation speed and the turbine rotation speed change rate through the step 113, and the run down control cancellation condition in the step 113 Is satisfied, the input torque is reduced rapidly with the slip amount, the target speed change stage, and the data value TR3 relative to the input torque.

Subsequently, the shift control unit 17 reduces the input side torque by the second predetermined slope SR, which is a data value compared to the target shift stage, in step 117.

therefore. Since the run down control is performed for the input side torque according to the control pattern of the input side torque described above, as shown in FIG. 5, the run down phenomenon of the turbine speed is eliminated.

As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing to the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the invention is indicated by the following claims rather than the above description, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the invention. .

1 is a diagram illustrating a hydraulic duty pattern of a general down shift.

2 is a view showing a configuration according to the present invention.

3 is a diagram illustrating an input side torque control pattern according to the present invention.

4 is a flowchart illustrating a downshift shifting process before stop according to the present invention.

5 is a view showing the turbine rotation speed according to the present invention.

<Code Description of Main Parts of Drawing>

11: engine control detector

13: engine control unit

15: engine control drive unit

17 shift control

19: shift control detecting unit

21: shift control drive unit

Claims (5)

Monitoring the turbine speed after receiving the downshift shift request before stopping; Determining whether a rundown determination condition is subsequently satisfied at a shift start time point (SB) at which the actual shift is performed based on the turbine rotational speed; Increasing control of the input side torque based on the input side torque, the target shift stage, and the slip amount when the run down determination condition is satisfied; And Determining whether the run down control termination condition is satisfied based on the turbine rotation speed and the turbine rotation speed change rate, and when the run down termination condition is satisfied, controlling down the input side torque; Shifting method. The method of claim 1, wherein the run down determination condition, The downshift shifting method before the vehicle, characterized in that it is determined that the run-down occurs when the difference between the turbine rotational speed and the turbine rotational speed before the shift start time is more than a predetermined value. The torque input control according to claim 1 or 2, Increasing the input side torque by the input torque and the slip amount and the 대비 data value relative to the target transmission stage when the difference between the turbine rotation speed and the target turbine rotation speed corresponding to the shift stage is equal to or less than a predetermined value; Then increasing the input side torque at a first predetermined slope set to a data value relative to the target shift stage; And maintaining the input side torque with the input torque and slip amount and the data value compared to the target shift stage. The method according to claim 1, wherein the run down control cancellation condition, A method of downshift shifting before a vehicle is stopped, wherein a ratio between the difference between the turbine rotational speed and the turbine rotational speed at the end of the shift and the turbine rotational speed change rate is equal to or less than a predetermined reference value. The torque input lowering control according to any one of claims 1 to 4, wherein Determining whether an input torque increase termination condition is satisfied based on the turbine rotation speed and the turbine rotation speed; If the input torque rise cancellation condition is satisfied as a result of the determination, reducing the input torque by the input torque, the slip amount and the data value compared to the target shift stage; And And a second predetermined slope set to a data value relative to the target shift stage to gradually reduce the input side torque.

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