KR101937023B1 - Learning control method for damper clutch - Google Patents

Abstract

The controller determines whether the operation state of the vehicle is a situation in which a predetermined hydraulic pressure value is required, and when the necessary learning conditions are satisfied, the solenoid valve control current for implementing the hydraulic pressure is applied, The solenoid valve control current is updated to an appropriate value, and then the solenoid valve is controlled in accordance with the updated control current.

Description

TECHNICAL FIELD [0001] The present invention relates to a damper clutch learning control method,

The present invention relates to a damper clutch learning control method and, more particularly, to a technique for controlling a damper clutch provided in a torque converter.

A torque converter is used in the transmission of the vehicle. The torque converter is provided with a damper clutch so that the engine connected to the torque converter can be directly connected to the turbine of the torque converter, thereby improving the fuel economy of the vehicle.

The damper clutch as described above is controlled by applying a control current to a solenoid valve for controlling the hydraulic pressure supplied to the damper clutch. In the transmission manufacturing line, the hydraulic pressure supplied to the damper clutch is measured with respect to the control current applied to the solenoid valve And compares the measured oil pressure with a predetermined normal oil pressure to determine whether the transmission is a positive or negative.

In addition, the controller of the vehicle has a map of the relationship between the hydraulic pressure to be provided to the damper clutch and the control current of the solenoid valve for forming such a hydraulic pressure, and controls the damper clutch using the map.

It is to be understood that the foregoing description of the inventive concept is merely for the purpose of promoting an understanding of the background of the present invention and should not be construed as an admission that it is a prior art already known to those skilled in the art. Will be.

KR 10-0838119 B1

The present invention does not need to judge whether the damper clutch hydraulic pressure is suitable for the control current in the transmission manufacturing line or not, and when the torque converter is mounted on the vehicle, the relationship of the solenoid valve control current to the hydraulic pressure of the damper clutch The present invention provides a damper clutch learning control method capable of ensuring an appropriate control performance of a damper clutch applied to a vehicle while reducing a cost due to a reduction in a test process of a transmission manufacturing line.

In order to achieve the above object, the present invention provides a damper clutch learning control method,

A learning object selecting step of selecting, as a learning target oil pressure value, the selected oil pressure value at the time when a driving state of the vehicle in which a predetermined oil pressure value is required among a plurality of predetermined oil pressure values predetermined by the controller occurs;

From the control map, the solenoid valve control current required for the controller to apply the hydraulic pressure corresponding to the learning target hydraulic pressure value to the damper clutch;

Wherein the controller controls at least one of the maximum slip amount of the damper clutch and the target slip amount at which the damper clutch reaches the target slip amount in advance for the corresponding operation state while controlling the solenoid valve with the control current obtained in the current acquisition step A reference maximum slip amount and a reference target arrival time;

Wherein the controller corrects the control current for the learning target hydraulic pressure value in the control map in accordance with the difference generated as a result of the comparison step and sets the hydraulic pressure value between the hydraulic current value corrected for the control current and another selected hydraulic pressure value adjacent thereto A learning step of newly updating the control currents by an interpolation method;

A learning applying step of, after the learning step, controlling the solenoid valve by selecting a control current of a solenoid valve with respect to a new oil pressure value required by the controller according to the driving state of the vehicle, from the updated control map;

And a control unit.

The plurality of selected hydraulic pressure values may be selected as at least two hydraulic pressure values separated from each other within the entire range of the hydraulic pressure supplied to the damper clutch under the control of the solenoid valve.

The plurality of selected hydraulic pressure values may be selected as hydraulic pressure values required for each of at least two vehicle operating conditions, that is, the tip of the vehicle, the intermediate kick down, the head kick down, the tip out, and the lift foot up.

The selected hydraulic pressure values may include a selected hydraulic pressure value for learning the hysteresis effect occurring in a situation where the hydraulic pressure of the damper clutch is released after the hydraulic pressure is released.

Wherein the control map stores a control current corresponding to a selected valid value for learning the hysteresis effect in two parts;

One of the two control currents is for a case where a steady state response of the damper clutch occurs by applying the hydraulic pressure again in a state where the hydraulic pressure is not released completely after starting to release the hydraulic pressure of the damper clutch, And then a hydraulic pressure is applied to the damper clutch to generate a transient response of the damper clutch.

If the maximum slip amount of the damper clutch is larger than the reference maximum slip amount as a result of the comparison step, the learning step significantly increases the control current with respect to the learning target oil pressure value as the difference becomes larger, The control current can be largely reduced and corrected.

Wherein the learning step includes: when the target arrival time of the damper clutch is longer than the reference target arrival time as a result of the comparison step, the control current for the learning target oil pressure value is significantly increased and corrected as the difference becomes larger, The control current can be greatly reduced and corrected.

The present invention does not need to judge whether the damper clutch hydraulic pressure is suitable for the control current in the transmission manufacturing line or not, and when the torque converter is mounted on the vehicle, the relationship of the solenoid valve control current to the hydraulic pressure of the damper clutch So that it is possible to secure the appropriate control performance of the damper clutch applied to the vehicle while reducing the cost by reducing the test process of the transmission manufacturing line.

1 is a view showing an example of connection between a damper clutch and a solenoid valve to which the present invention can be applied;
2 is a graph showing an initial state of a control map usable in the present invention,
3 is a flowchart showing an embodiment of a damper clutch learning control method according to the present invention,
4 is a graph illustrating an example of learning according to the present invention,
FIG. 5 is a graph illustrating a learning principle of the tip-in according to the present invention,
6 is a graph illustrating an example of hysteresis learning for transient response of the damper clutch.

1 shows a damper clutch 3 of a torque converter 1 to which the present invention can be applied, a damper clutch control valve 5 for controlling the damper clutch 3, a damper clutch control valve 5 for controlling the damper clutch 3, A solenoid valve 7 for controlling the hydraulic pressure supplied to the damper clutch 3 and finally a controller 9 for applying a control current for controlling the solenoid valve 7 are disclosed.

A pressure reducing valve 11 is also shown which supplies the line pressure generated by a regulator valve (not shown) to the damper clutch control valve 5.

2 is a graph showing the relationship of control currents to be applied to the solenoid valve 7 in order to form the hydraulic pressure to be provided to the damper clutch 3, Is stored in a storage device.

The state of the hydraulic pressure and the control current shown in FIG. 2 is an initial value to be input to the storage device. This initial value is used for repeated experiment and analysis of the combination of a plurality of damper clutches 3 and solenoid valves 7 ≪ / RTI >

Logically, in a vehicle equipped with a combination of the damper clutch 3 and the solenoid valve 7 as described above, the average values obtained by the repeated experiment and analysis are input to the controller 9 control the solenoid valve 7, the hydraulic pressure corresponding to the damper clutch 3 must be applied. However, in reality, the damper clutch 3 and the solenoid valve 7 are not required to be machined and assembled Even if the same control current is applied to the solenoid valve due to a deviation or the like, the hydraulic pressure actually acting on the damper clutch may not exactly coincide.

In order to cope with the situation as described above, the control map is constructed as an initial value having the average values as shown in FIG. 2 at the time of initial assembling and manufacturing of the transmission and the vehicle, Even if there is no correction, an abnormal hydraulic pressure is applied to the damper clutch due to various reasons for the applied solenoid valve control current, while applying a control current to the solenoid valve so that a correct hydraulic pressure corresponding thereto can be applied to the damper clutch So that the controller can more precisely control the damper clutch through the solenoid valve.

3 is a flowchart showing an embodiment of the damper clutch learning control method according to the present invention. In the embodiment of the present invention, when the controller 9 determines that a predetermined hydraulic pressure value among a plurality of predetermined hydraulic pressure values (S10) for selecting the selected hydraulic pressure value at that time as the learning target hydraulic pressure value when an operation state of the learning target hydraulic pressure value is generated; A current acquisition step (S20) of acquiring, from the control map, the control current of the solenoid valve (7) required for the controller (9) to apply the hydraulic pressure corresponding to the learning target hydraulic pressure value to the damper clutch (3); The controller 9 controls the solenoid valve with the control current obtained in the current acquiring step S20 so that the maximum slip amount of the damper clutch 3 and the target slip amount of the damper clutch 3 reaching the target slip amount A comparison step (S30) of comparing at least one of an arrival time with a reference maximum slip amount and a reference target arrival time which are determined in advance for a corresponding operating situation; The controller 9 corrects the control current for the learning target hydraulic pressure value in the control map according to the difference generated as a result of the comparison step S30, A learning step (S40) of updating the control currents by the interpolation method with respect to the oil pressure values between the oil pressure values; After the learning step S40, the controller 9 selects the control current of the solenoid valve 7 with respect to the new hydraulic pressure value required according to the driving state of the vehicle from the updated control map, and outputs the control current to the solenoid valve 7, And a learning application step (S50) for controlling the application.

That is, the controller 9 determines whether the operation state of the vehicle is a situation in which a predetermined hydraulic pressure value is required, and when the necessary learning conditions are satisfied, the controller 9 controls the solenoid valve 7 to implement the hydraulic pressure The control current of the solenoid valve 7 is updated to an appropriate value in accordance with the reaction (maximum slip amount, target arrival time) of the damper clutch 3 while applying the current, and thereafter the solenoid valve 7 7).

Particularly, when the learning is performed for one selected oil pressure value, the control current is updated together with the oil pressure values between the selected oil pressure value adjacent to the selected oil pressure value by the interpolation method as described above.

That is, according to the present invention, at least two representative hydraulic pressure values among the entire hydraulic pressure range to be applied to the damper clutch 3 are selected as the selected hydraulic pressure values, So that data can be secured.

Accordingly, it is preferable that the plurality of selected hydraulic pressure values are selected by at least two hydraulic pressure values spaced apart from one another within the entire range of the hydraulic pressure supplied to the damper clutch 3 under the control of the solenoid valve 7.

In particular, the plurality of selected hydraulic pressure values are typical situations that may occur during driving of the vehicle, such as TIP-IN, KICK DOWN, Kick-down kickdown, TIP-OUT, It is preferable to select the hydraulic pressure values required for at least two of the vehicle operation situations among the lift foot-ups (LIFT FOOT UP).

The tip-in means a situation in which the driver depresses the accelerator pedal from a state in which the accelerator pedal is not depressed. This means that the shift amount of the accelerator pedal is less than about 20% and the shift is not caused in the transmission.

The kick-down is a situation in which the shift from a current speed change stage to a lower speed change stage in the transmission is caused by an accelerator pedal operation of the driver, and the intermediate kick down is a case where the accelerator pedal operation amount is about 30 to 60% And the head kickdown may be set to an acceleration pedal operation amount of 60% or more.

The tip-out refers to a situation in which the driver depresses the accelerator pedal and then lifts the foot from the accelerator pedal so that the amount of manipulation of the accelerator pedal becomes 0%, and the shift does not occur. On the other hand, % Means that the shifting to the upper gear range is caused.

On the other hand, among the plurality of selected hydraulic pressure values, it is preferable that a selected hydraulic pressure value for learning the hysteresis effect generated in a situation where the hydraulic pressure of the damper clutch 3 is started to be released after the hydraulic pressure is released.

2, the graph of the hydraulic pressure with respect to the control current is represented by two straight lines. The straight line on the right side of the graph indicates the state when the damper clutch 3 is controlled in the direction of increasing the hydraulic pressure And a relatively straight line on the left side indicates a state in which the hydraulic pressure applied to the damper clutch 3 is controlled to decrease.

That is, even when the same control current is applied to the solenoid valve, a situation where control is performed while increasing the hydraulic pressure to the damper clutch 3 and a situation where control is performed while releasing the hydraulic pressure forms different hydraulic pressures. Therefore, the controller 9 must take such a situation into account so that the damper clutch 3 can be controlled more accurately.

The selected hydraulic pressure value for learning the hysteresis effect is preferably set to a relatively low hydraulic pressure value, for example, about 0.4 to 0.5 bar. As can be seen from the graph of FIG. 2, as the hydraulic pressure is lower, the deviation of the control current due to the hysteresis effect is largely generated, so that it is effectively reflected in the control map.

In particular, it is preferable that the control map stores a control current corresponding to a selected value for learning the hysteresis effect in two ways.

One of the two control currents corresponding to the selected hydraulic pressure value for learning the hysteresis effect starts to release the hydraulic pressure of the damper clutch 3 and then the hydraulic pressure is applied again in a state in which the hydraulic pressure is not completely released, And the other is for the case where the transient response of the damper clutch 3 occurs by applying the hydraulic pressure again after completely releasing the hydraulic pressure of the damper clutch 3. [

That is, in a situation where the hydraulic pressure is applied again after completely releasing the hydraulic pressure of the damper clutch 3, a transient phenomenon occurs such as a so-called fill time which refers to the time for the hydraulic pressure to be filled in the damper clutch 3, So that the control of the damper clutch 3 can be more appropriately performed by distinguishing this situation from the case where the steady state response occurs.

For example, the controller 9 uses the control current for the transient response of the damper clutch 3 in a situation where the control current of the solenoid valve 7 is controlled to 0 or less and then the hydraulic pressure is applied to the damper clutch 3 again So that the control current for the steady state response is used in a situation where the control current is not controlled to be 0 or less even if the same hydraulic pressure is applied to the damper clutch 3, It is possible to control the damper clutch 3 more accurately.

When the controller 9 determines that any one of the predetermined hydraulic pressure values among the predetermined hydraulic pressure values is required as described above during the execution of the learning object selection step S10, It is possible to further confirm whether the learning condition is satisfied prior to selecting the selected hydraulic pressure value as the learning target hydraulic pressure value so that the learning step S40 can be performed only when all the learning conditions are satisfied.

That is, not only the hydraulic pressure value required for the damper clutch 3 corresponds to one of the selected hydraulic pressure values but also the engine cooling water temperature and the ATF temperature, for example, indicate the steady state operation of the vehicle, and the vehicle speed is 70 to 80 Km / h and 120 Km / h or less, whether the gradient of the current road is not at an excessive level and at an ordinary level, and the like, so that the vehicle is in a normal state and the vehicle speed is within a normal vehicle speed range , The learning step (S40) is performed only when the gradient of the road is at a normal level, so that it is possible to prevent indiscreet learning and ensure reliability and stability of learning.

If the maximum slip amount of the damper clutch 3 is larger than the reference maximum slip amount as a result of the comparison step S30, the learning step S40 increases the control current for the learning target oil pressure value as the difference becomes larger When the difference is small, the control current can be greatly reduced and corrected as the difference is large.

In the learning step S40, if the target arrival time of the damper clutch 3 is longer than the reference target arrival time as a result of the comparison step S30, the control current for the learning target oil pressure value increases as the difference becomes larger The control current is largely increased and corrected. In the short case, the larger the difference is, the larger the control current can be reduced and corrected.

In the learning step S40, the control current may be corrected in consideration of both the maximum slip amount and the target arrival time.

At this time, the control current correction amount according to the difference between the maximum slip amount and the reference maximum slip amount, and the control current correction amount according to the difference between the target arrival time and the reference target arrival time, .

FIG. 4 illustrates an example in which learning is performed according to the present invention. First, a graph that changes as learning progresses from a graph of the state as shown in FIG. 2 is explained. As a result, Below is a graphical representation of the learning contents of FIG. 4, which can be seen as an example of a control map substantially stored in the storage device.

In the case of the control map as shown in the above table, the selected hydraulic pressure values can be regarded as 0.5 bar of hysteresis, 1.5 bar of tip-in, 2.5 bar of intermediate kick-down and 3.5 bar of head kick down.

For example, in a situation where the conditions such as the engine cooling water temperature, the ATF temperature, the vehicle speed, the road gradient, and the like are satisfied during the running of the vehicle, the controller 9 generates a driving condition in which the driver treads the accelerator pedal, When the required hydraulic pressure of the damper clutch 3 is 1.5 bar, which is the selected hydraulic pressure, 1.5 bar is selected as the learning target hydraulic pressure value.

The controller 9 obtains the initial value 0.53 mA of the control current of the solenoid valve 7 corresponding to 1.5 bar from the control map and controls the solenoid valve 7 with the control current to control the damper clutch 3, And the target slip amount is compared with the reference maximum slip amount and the reference target slip amount.

5, when the driver does not operate the accelerator pedal and operates, the slip occurs in the damper clutch 3 due to the increased engine torque, and the controller 9 is in a tip The hydraulic pressure of the damper clutch 3 according to the above equation is calculated to be 1.5 bar and the solenoid valve 7 starts to be controlled at 0.53 mA. As a result, the engine RPM as shown increases in slip according to the reference behavior Should decrease.

In this case, no learning is required, and the control current of the control map is maintained.

However, in the same situation as described above, the RPM behavior of the engine may occur in the same state as in (1) or (2). In the case of (1), excessive hydraulic pressure of 1.5 bar or more may be generated for a control current of 0.53 mA. It can be seen that the hydraulic pressure that is relatively low is less than 1.5 bar.

In this case, the difference between the maximum slip amount and the target slip arrival time differs from the case of the reference RPM of the engine RPM, and the correction value to be used to correct the control current is determined according to how large the difference is.

For example, if the maximum slip amount occurring in the case of the reference behavior of the engine RPM is 10RPM, the reference maximum slip amount is 10RPM, and if the maximum slip amount is 1RPM, For example, 0.04 mA, and subtracts from the initial value control current of 0.53 mA to update the learning value to 0.49 mA. Figure 4 and the above diagram correspond to this case.

Of course, when the maximum slip amount is 6 RPM and the difference from the reference maximum slip amount is calculated as 4 RPM, a correction value of 0.02 mA, for example, is obtained from the correction map, and the learning value is corrected to 0.51 mA.

On the contrary, when the difference between the reference maximum slip amount and the reference maximum slip amount is 20RPM, the maximum slip amount is 20RPM as in the case (2), so that the oil pressure is insufficient. Therefore, And the value is added to the initial value control current of 0.53 mA to update the learning value to 0.58 mA.

The acquisition and storage of the correction value as described above can be performed by comparing the target arrival time with the reference target arrival time. Here, the target arrival time is a time when the slip amount of the damper clutch 3 reaches the target slip amount, If the target arrival time is longer than the reference target arrival time set based on the reference behavior of the engine RPM, the control current is corrected to be larger according to the longer time, If the difference is shorter than the reference target arrival time, the control current is corrected so as to become smaller as the difference becomes larger, so that the next arrival time of the same situation approaches the reference target arrival time.

Even in the case of the mediation kick-down, the head kick-down, and the like, the learning can be performed in a manner substantially similar to the case of the tip-in.

On the other hand, the learned value of the hydraulic pressure value between the selected hydraulic pressure values as described above is obtained by interpolation between the selected hydraulic pressure value that has been learned and the selected hydraulic pressure value adjacent thereto as described above.

In this example, the hydraulic values of 1, 2, 3, and 4 bar are obtained by interpolation. For reference, 0 bar and 4.5 bar are the minimum and maximum hydraulic values, respectively. When the selected hydraulic pressure value is learned, when the interpolation method is applied to the hydraulic pressure values in between, the same function as the selected hydraulic pressure value is used to calculate the hydraulic pressure value therebetween.

That is, when the control current is learned at 0.82 mA for the hydraulic oil value of 3.5 bar and 3.5 bar of the head kickdown, the learned control current and the control hydraulic current of 4.5 bar, 0.9 mA, And the control current of 0.86 mA is updated to the learning value by the interpolation method.

On the other hand, in the case of tip-out or lift-up, hysteresis learning can be performed. That is, as the driver suddenly releases the accelerator pedal, the torque and the rotational speed of the engine are reduced. Accordingly, the controller 9 reduces the oil pressure of the damper clutch 3 to induce a damping action by slipping the damper clutch 3, The control for coupling the clutch 3 again is performed. At this time, hysteresis learning can be performed.

In the case of learning the hysteresis effect, the selected hydraulic pressure value for hysteresis learning is set at 0.5 bar. In the graph, three initial values are shown in order from the left, Is a control current for implementing 0.5 bar when controlling the hydraulic pressure applied to the clutch 3, and 0.4 mA at the center is a control current for controlling the hydraulic pressure of the damper clutch 3 Of the damper clutch 3 in the direction in which the hydraulic pressure of the damper clutch 3 is increased in a state in which the hydraulic pressure of the damper clutch 3 is not completely released, And 0.6 mA on the right side represents the initial value of the transient response generated when the hydraulic pressure of the damper clutch 3 is sufficiently released and then the hydraulic pressure is applied again. .

The graph of FIG. 4 shows the case of the steady state response during the steady state response and the transient response. The hydraulic pressure of the damper clutch 3 is reduced to 0.5 bar by the control current of 0.1 mA of the solenoid valve 7 When the control is performed in the direction in which the hydraulic pressure is not fully released and the hydraulic pressure is again increased, the maximum slip amount of the damper clutch 3 and the target arrival time are stored in advance The correction value of the control current is obtained from a separate correction map by comparing the reference maximum slip amount generated in the case of the engine RPM reference behavior with the reference target arrival time and the learning value of the obtained control current is 0.46 mA .

6 represents the transient state response of the above table. The control current of the solenoid valve 7 is set to 0 or less, the hydraulic pressure of the damper clutch 3 is sufficiently released, and the control current is supplied to the solenoid valve 7 The control is performed so that the maximum slip amount of the damper clutch 3 and the target slip amount of the damper clutch 3 are controlled while the control current is controlled to be 0.6 mA as the initial value for forming the selected hydraulic pressure value of 0.5 bar from the state of 0 or less, Is compared with a reference maximum slip amount occurring in the case of the reference behavior of the engine RPM stored in advance and a reference target arrival time so as to obtain a correction value of the control current from a separate correction map, And the learning value is 0.58 mA.

Here, the two straight lines in Fig. 6 are the same as the straight lines indicating the initial values in Fig. 4, and are shown for reference.

In the case of the hysteresis learning, different learning results are derived depending on whether the response of the damper clutch 3 is the steady state response or the transient state response to the same selected hydraulic pressure value. And by controlling the damper clutch 3 by using learning values according to the respective situations, it is possible to improve the control response and the accuracy, and ultimately contribute to the improvement of the driving quality of the vehicle.

For reference, the control current can be used in almost the same manner as the control duty (DUTY) for controlling the solenoid valve.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

One; Torque converter
3; Damper clutch
5; Damper clutch control valve
7; Solenoid valve
9; controller
11; Pressure reducing valve
S10; Selecting the Learning Object
S20; Current acquisition step
S30; Comparison step
S40; Learning stage
S50; Steps to apply learning

Claims (7)

A learning object selecting step of selecting, as a learning target oil pressure value, the selected oil pressure value at the time when a driving state of the vehicle in which a predetermined oil pressure value is required among a plurality of predetermined oil pressure values predetermined by the controller occurs;
From the control map, the solenoid valve control current required for the controller to apply the hydraulic pressure corresponding to the learning target hydraulic pressure value to the damper clutch;
Wherein the controller controls at least one of the maximum slip amount of the damper clutch and the target slip amount at which the damper clutch reaches the target slip amount in advance for the corresponding operation state while controlling the solenoid valve with the control current obtained in the current acquisition step A reference maximum slip amount and a reference target arrival time;
Wherein the controller corrects the control current for the learning target hydraulic pressure value in the control map in accordance with the difference generated as a result of the comparison step and sets the hydraulic pressure value between the hydraulic current value corrected for the control current and another selected hydraulic pressure value adjacent thereto A learning step of newly updating the control currents by an interpolation method;
And a learning applying step of, after the learning step, controlling the solenoid valve by selecting the control current of the solenoid valve with respect to a new oil pressure value required by the controller according to the driving state of the vehicle, from the updated control map ,
Wherein the plurality of selected hydraulic pressure values are selected as at least two hydraulic pressure values spaced apart from each other within the entire range of the hydraulic pressure supplied to the damper clutch under the control of the solenoid valve;
Wherein the plurality of selected hydraulic pressure values are selected as hydraulic pressure values required for at least two vehicle operating conditions among the tip of the vehicle, the intermediate kick down, the head kick down, the tip out, and the lift foot up
Wherein the damper clutch is controlled by the damper clutch. delete delete The method according to claim 1,
The plurality of selected hydraulic pressure values include a selected hydraulic pressure value for learning a hysteresis effect generated in a situation where the hydraulic pressure of the damper clutch is released after the hydraulic pressure is released
Wherein the damper clutch is controlled by the damper clutch. The method of claim 4,
Wherein the control map stores a control current corresponding to a selected valid value for learning the hysteresis effect in two parts;
One of the two control currents is for a case where a steady state response of the damper clutch occurs by applying the hydraulic pressure again in a state where the hydraulic pressure is not released completely after starting to release the hydraulic pressure of the damper clutch, Wherein the damper clutch learning control method is for a case where an excessive response of the damper clutch occurs by applying hydraulic pressure again after completely releasing the damper clutch. The method according to claim 1,
If the maximum slip amount of the damper clutch is larger than the reference maximum slip amount as a result of the comparison step, the learning step significantly increases the control current with respect to the learning target oil pressure value as the difference becomes larger, The control current is largely reduced and corrected
Wherein the damper clutch is controlled by the damper clutch. The method according to claim 1,
Wherein the learning step includes: when the target arrival time of the damper clutch is longer than the reference target arrival time as a result of the comparison step, the control current for the learning target oil pressure value is significantly increased and corrected as the difference becomes larger, The control current is largely reduced and corrected
Wherein the damper clutch is controlled by the damper clutch.

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