KR102246626B1 - Method and system for controlling damper clutch - Google Patents

Abstract

The present invention relates to technology for more conveniently and stably controlling a damper in the entire shift section by performing slip control of a damper clutch using a hydraulic map reflecting the transmission characteristics. The present invention provides a damper clutch control method and a system thereof. In the present invention, when a shift command is applied, the damper control hydraulic pressure is reduced by the hydraulic map reflecting the hydraulic characteristics of a current gear stage to slip a damper clutch slip amount in a lockup state to a target slip amount. The feedback-controlling of the damper control hydraulic pressure is performed, so that the slip amount of the damper clutch is actually shifted while maintaining the target slip amount. When the actual shifting is completed, the damper control hydraulic pressure is increased by the hydraulic map reflecting the hydraulic characteristics of the target gear stage to lock up the damper clutch again.

Description

Damper clutch control method and system {METHOD AND SYSTEM FOR CONTROLLING DAMPER CLUTCH}

The present invention relates to a damper clutch control method and system for performing damper control more conveniently and stably in the entire transmission area by performing slip control of a damper clutch using a hydraulic map reflecting transmission characteristics.

The automatic transmission has the advantage of improving the driving convenience of the driver, but has a disadvantage in that fuel consumption increases due to power loss due to fluid slip in the torque converter.

In order to compensate for such shortcomings, a damper clutch is installed in the torque converter to be directly connected to the flywheel, thereby minimizing slip of the torque converter while driving to improve fuel economy.

However, when the control that directly connects the damper clutch to improve fuel economy becomes frequent, an impact force is generated in the process of engaging and releasing the damper clutch, resulting in a problem that deteriorates the driving feel and drivability of the vehicle.

Accordingly, recently, control has been made so as to absorb the shock in a region where drivability tends to deteriorate, particularly in a section where a shift shock may occur by causing an appropriate slip in the damper clutch in a shift section.

For example, the shift section is divided into three sections, and a calibration work is performed by applying a hydraulic map that uses engine torque and slip amount as axes for each section, and the result is set as a set value in the TCU, and the damper clutch is operated. It will build up hydraulic pressure.

However, since such a control method uses a different map for each section, there is a problem in that the capacity of the logic is increased because a map must be provided for each section for one shift control.

In addition, in order to alleviate the shift shock, the actual control hydraulic pressure should be set by checking the optimum slip amount after performing a test on the possible shift generation area. In particular, as the gear level increases according to the multistage of the automatic transmission. There is a problem that the amount of shift that the engineer must develop is further increased, making the work of calibration increasingly difficult.

In addition, since the calibration method relies on the method of finding the optimum value after reproducing the phenomenon rather than based on the characteristics of the transmission, the reliability of the result is highly dependent on the know-how of the engineer.

The matters described as the background art are only for enhancing an understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

JP 2005-299860 A

The present invention was conceived to solve the above-described problems, and by performing slip control of the damper clutch using a hydraulic map reflecting transmission characteristics, a damper that performs damper control more conveniently and stably in the entire shift section It is to provide a clutch control method and system.

The configuration of the present invention to achieve the above object, the controller, when a shift command is applied, reduces the damper control hydraulic pressure by the hydraulic map reflecting the hydraulic characteristics of the current gear stage to reduce the damper clutch slip amount in the locked-up state. A shift preparation step of slipping at a target slip amount; An actual speed change step of controlling, by a controller, a damper control hydraulic pressure as a feedback control so that a slip amount of the damper clutch is actually changed while maintaining the target slip amount; And a shift completion step of re-locking the damper clutch by increasing the damper control hydraulic pressure by the controller by the hydraulic map reflecting the hydraulic characteristics of the target gear when the actual shift is completed.

The hydraulic map may be determined based on a relationship between hydraulic characteristics of a gear stage, engine torque, and transmission input shaft rotational speed.

Before the shift preparation step, a target slip amount of the damper clutch may be set for each gear stage, and a target slip hydraulic pressure for slipping at the target slip amount may be set.

In the shift preparation step, slope control of the damper control hydraulic pressure may be performed so that the slip amount of the damper clutch is gradually increased from the time when the shift command is applied to reach the target slip amount.

In the actual transmission step, the damper control hydraulic pressure may be feedback-controlled using a hydraulic map reflecting the hydraulic characteristics of the current gear stage.

In the shift completion step, a slope control of the damper control hydraulic pressure may be performed so that the slip amount of the damper clutch is gradually reduced and re-locked.

The configuration of the present invention comprises: a hydraulic map storage unit configured to set and store a hydraulic map of the damper control hydraulic pressure according to the target slip amount of the damper clutch for each gear stage; When a shift command is applied, the damper control hydraulic pressure is reduced by the hydraulic map reflecting the hydraulic characteristics of the current gear stage to slip the damper clutch slip amount in the locked-up state to the target slip amount, and the slip amount of the damper clutch is the target slip amount. And a controller for controlling the damper control hydraulic pressure as a feedback control so as to maintain the actual transmission while maintaining the actual transmission, and increasing the damper control hydraulic pressure by the hydraulic map reflecting the hydraulic characteristics of the target gear when the actual transmission is completed to re-lock the damper clutch. It can be characterized.

Through the above-described problem solving means, the present invention performs slip control of the damper using a hydraulic map reflecting the gear stage characteristics before and after the shift for each section in which the shift is performed, so that more stable damper control is achieved in the process of shifting. As a result, there is an effect of improving the driving stability of the vehicle.

Moreover, it is possible to implement damper control by simply setting an appropriate target slip amount for each shift section. Also, even if engine torque or other engine elements are changed, there is no need to manually adjust the hydraulic map for each shift section. By enabling the damper control in the shift section, there is also an effect that the damper control is made easy and simple.

1 is a flow chart sequentially listing a method for controlling a damper clutch according to the present invention.
2 is a view for explaining a damper control process of the present invention, a damper slip behavior and a damper control pressure according to the damper control.
3 to 6 are diagrams illustrating target control hydraulic pressure according to engine torque and transmission input shaft rotational speed when target slip amounts are 0RPM, 100RPM, 200RPM, and 300RPM based on the second stage.

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention performs slip control of a damper clutch using a hydraulic map reflecting the characteristics of a gear stage in all areas of a vehicle shift section, thereby performing damper control simply and stably.

Accordingly, according to FIG. 1, the damper clutch control method according to the present invention includes a shift preparation step (S10), an actual shift step (S20), and a shift completion step (S30).

Looking specifically at the present invention, in the shift preparation step (S10), when a shift command is applied by the controller, the damper control hydraulic pressure is reduced by the hydraulic map reflecting the hydraulic characteristics of the current gear stage, thereby targeting the damper clutch slip amount in the locked-up state. Slip by the amount of slip. Here, the shift command may be an upshift shift in which shift is performed to an upper stage.

In the actual shifting step (S20), the controller feedback-controls the damper control hydraulic pressure so that the actual shifting is achieved while maintaining the target slip amount of the damper clutch.

In the shift completion step (S30), the controller increases the damper control hydraulic pressure according to the hydraulic map reflecting the hydraulic characteristics of the target gear when the actual shift is completed, thereby re-locking the damper clutch.

FIG. 2 shows an example of a damper slip behavior and a damper control pressure according to the damper control of the present invention. When specifically described with reference to the drawings, the upshift shift section is largely divided into three sections.

Among them, T1 is a control section for securing a target slip amount through the shift preparation step S10, and becomes a section between A and B.

Here, A denotes a time point at which shift control starts as a shift command is applied, and is a time point at which the damper clutch starts to slip in a locked-up state.

In addition, S1 at the end point of T1 is a slip amount for minimizing the shift shock at the start point of actual shifting, and this may be a target slip amount.

Here, the target slip amount is a value that can be determined through a test, and a total of four target slip amounts may be set as 0RPM, 100RPM, 200RPM, and 300RPM.

In addition, T2 is a control section for maintaining the target slip amount through the actual shift step S20, and becomes a section between B and C.

Here, B denotes a point in time when the actual transmission starts in the corresponding upshift shifting process, and is a point in time at which the turbine rotational speed starts to decrease. For reference, according to the shift preparation step (S10), the slip control of the damper clutch is performed as the target slip amount at the point A'before the point B.

In addition, S2 at the end of T2 is a slip amount for maintaining the target slip amount of S1 in the actual shift section.

Subsequently, T3 is a control section for re-locking up the damper clutch by releasing the target slip amount through the shift completion step S30, and becomes a section between C and D.

Here, C is the point at which the actual transmission is completed, and this is the moment at which the gear ratio of the target gear stage is reached. And, D is the time point at which the corresponding upshift shift is completed.

Then, S3 at the end point of T3 becomes the slip amount at the point of completion of the shift control, that is, the slip amount for re-locking the damper clutch.

According to this configuration, the present invention performs slip control of a damper using a hydraulic map reflecting gear stage characteristics before and after the shift for each section in which the shift is performed.

In addition, in the case of an automatic transmission, the characteristics of the control hydraulic pressure are different for each gear stage due to factors such as a transmission load according to the transmission structure and control characteristics, and a difference in driving resistance for each vehicle speed.

Therefore, by using the difference in the characteristics of the control hydraulic pressure to control the damper control hydraulic pressure based on the current gear stage in the shift preparation section and the damper control hydraulic pressure based on the target gear stage in the shift completion section, more stable damper control during the shifting process. As a result, the driving stability of the vehicle is improved.

On the other hand, the hydraulic map of the present invention may be determined by the relationship between the hydraulic characteristics of the gear stage, the engine torque, and the rotation speed of the transmission input shaft.

3 to 6 show an example of a hydraulic map applicable to the present invention, and target control hydraulic pressure according to engine torque and transmission input shaft rotation speed when the target slip amount is 0RPM, 100RPM, 200RPM, and 300RPM based on the second gear stage. Is exemplified.

In other words, it is possible to implement damper control by simply setting an appropriate target slip amount for each shift section, and even if engine torque or other engine elements are changed, it is not necessary to manually adjust the hydraulic map for each shift section. By enabling the damper control in the shift section, the damper control is made easy and simple.

In addition, in the present invention, before the shift preparation step (S10), a target slip amount of the damper clutch may be set for each gear stage, and a target slip hydraulic pressure for slipping at the target slip amount may be set. Accordingly, during the damper control, the damper control hydraulic pressure is controlled to the target slip hydraulic pressure, so that the slip amount of the damper clutch is slipped to the target slip amount.

That is, the hydraulic map according to the target slip amount is preset and stored for each gear stage, so that the damper control is performed using the hydraulic map stored for the current gear stage and the target gear stage during the gear shifting process.

In addition, referring to FIG. 2, in the shift preparation step (S10) of the present invention, the slope control of the damper control hydraulic pressure is performed to reach the target slip amount by gradually increasing the slip amount of the damper clutch from the time the shift command is applied. Will be carried out.

That is, if the damper is immediately controlled by the damper clutch slip amount to the target slip amount, the slip shock of the damper clutch may be caused by the sudden slip occurrence of the damper clutch. As it is made linearly, the occurrence of slip impact of the damper clutch is suppressed.

In addition, in the actual transmission step (S20) of the present invention, the damper control hydraulic pressure may be feedback-controlled using a hydraulic map reflecting the hydraulic characteristics of the current gear stage.

That is, the actual shift section is a section in which the target slip amount secured in the shift preparation section is maintained, and the target slip amount is maintained through PID correction by applying the hydraulic map of the current gear stage.

Subsequently, in the shift completion step (S30), the slope control of the damper control hydraulic pressure is performed so that the slip amount of the damper clutch is gradually reduced and re-locked.

In other words, after the actual shift is completed, the slip is minimized again.If the damper is immediately controlled with the target slip amount in the lock-up state, the damper clutch's fastening shock is caused by the sudden lock-up of the damper clutch. Therefore, the damper hydraulic pressure fluctuates linearly through the slope control of the damper control hydraulic pressure, thereby suppressing the occurrence of a fastening impact of the damper clutch.

Meanwhile, the damper clutch control system according to the present invention includes a hydraulic map storage unit and a controller.

First, the hydraulic map storage unit sets and stores the hydraulic map of the damper control hydraulic pressure according to the target slip amount of the damper clutch for each gear stage.

When a shift command is applied, the controller reduces the damper control hydraulic pressure by the hydraulic map reflecting the hydraulic characteristics of the current gear stage to slip the damper clutch slip amount in the locked-up state to the target slip amount, and the slip amount of the damper clutch is the The damper control hydraulic pressure is feedback-controlled so that the actual transmission is performed while maintaining the target slip amount, and the damper clutch is re-locked by increasing the damper control hydraulic pressure by the hydraulic map reflecting the hydraulic characteristics of the target gear stage when the actual transmission is completed. do.

Here, the controller may be a TCU in charge of electronic control of the transmission, and a hydraulic map may be stored in the TCU.

For reference, the controller according to an exemplary embodiment of the present invention includes an algorithm configured to control the operation of various components of a vehicle or a nonvolatile memory (not shown) configured to store data related to a software command for reproducing the algorithm, and It may be implemented through a processor (not shown) configured to perform an operation described below using data stored in the corresponding memory. Here, the memory and the processor may be implemented as individual chips. Alternatively, the memory and processor may be implemented as a single chip integrated with each other. The processor may take the form of one or more processors.

Meanwhile, referring to FIG. 2, when the damper clutch control process according to the present invention is exemplified and described, when an upshift shift from 2nd to 3rd is requested by the vehicle speed and APS signal reflecting the driving state of the vehicle, the current stage Based on the two-stage hydraulic map, S1, which is the target slip amount at point A', is set.

Accordingly, the damper control hydraulic pressure is tilted to the target slip hydraulic pressure from the point A to the point A'using the two-stage hydraulic map, and the damper clutch is slip-controlled to the target slip amount in the locked-up state (S10).

Then, while controlling the slip amount of the damper clutch to maintain the target slip amount, the damper control hydraulic pressure is maintained until the point B based on the two-stage hydraulic map, and then the target slip amount is maintained in the actual transmission section from the point B to the point C. The feedback control is performed (S20).

After that, the lockup target slip amount S3 is set based on the 3rd level hydraulic map, which is the target level at point C.

Accordingly, the damper control hydraulic pressure from the point C to the point D is tilted to the target slip hydraulic pressure for lock-up using the three-stage hydraulic map, and the damper clutch is controlled from the slip state to the re-lock-up state (S30). For reference, after the point D, the damper hydraulic pressure is increased and controlled according to the slope control between C and D, thereby achieving a stable lock-up state of the damper clutch.

As described above, in the present invention, the slip control of the damper is performed using a hydraulic map reflecting the gear stage characteristics before and after the shift for each section in which the shift is performed, so that a more stable damper control is achieved in the process of shifting. Improves the driving stability of the vehicle.

Moreover, it is possible to implement damper control by simply setting an appropriate target slip amount for each shift section. Also, even if engine torque or other engine elements are changed, there is no need to manually adjust the hydraulic map for each shift section. By enabling the damper control in the shift section, the damper control is made easy and simple.

On the other hand, the present invention has been described in detail only for the above specific examples, but it is obvious to those skilled in the art that various modifications and modifications are possible within the scope of the technical idea of the present invention, and it is natural that such modifications and modifications belong to the appended claims. .

S10: shift preparation stage
S20: Actual shifting step
S30: Shift completion stage

Claims (7)

A shift preparation step in which the controller slips the damper clutch slip amount in the locked-up state to the target slip amount by reducing the damper control hydraulic pressure by the hydraulic map reflecting the hydraulic characteristics of the current gear stage when the shift command is applied;
An actual shift step of controlling, by a controller, a damper control hydraulic pressure as a feedback control so that the slip amount of the damper clutch is actually shifted while maintaining the target slip amount; And
Including; a shift completion step of re-locking the damper clutch by increasing the damper control hydraulic pressure by the controller by the hydraulic map reflecting the hydraulic characteristics of the target gear stage when the actual shift is completed,
The hydraulic map is a damper clutch control method, characterized in that the relationship between the hydraulic characteristics of the gear stage, engine torque, and transmission input shaft rotational speed. delete The method according to claim 1,
Before the shift preparation step,
A damper clutch control method, wherein a target slip amount of the damper clutch is set for each gear stage, and a target slip hydraulic pressure for slipping at the target slip amount is set. The method according to claim 1,
In the shift preparation step,
A damper clutch control method, characterized in that, from a time when the shift command is applied, gradient control of the damper control hydraulic pressure is performed to gradually increase the slip amount of the damper clutch to reach the target slip amount. The method according to claim 1,
In the actual transmission step,
A damper clutch control method, characterized in that feedback-controlling the damper control hydraulic pressure using a hydraulic map reflecting the hydraulic characteristics of the current gear stage. The method according to claim 1,
In the shift completion step,
And controlling the slope of the damper control hydraulic pressure so that the slip amount of the damper clutch is gradually reduced and re-locked. A hydraulic map storage unit configured to set and store a hydraulic map of the damper control hydraulic pressure according to the target slip amount of the damper clutch for each gear stage;
When a shift command is applied, the damper control hydraulic pressure is reduced by the hydraulic map reflecting the hydraulic characteristics of the current gear stage to slip the damper clutch slip amount in the locked-up state to the target slip amount, and the slip amount of the damper clutch is the target slip amount. And a controller for controlling the damper control hydraulic pressure as a feedback control so as to maintain the actual transmission while maintaining the actual transmission, and increasing the damper control hydraulic pressure by the hydraulic map reflecting the hydraulic characteristics of the target gear when the actual transmission is completed to re-lock the damper clutch, and including,
The hydraulic map is a damper clutch control system, characterized in that the relationship between the hydraulic characteristics of the gear stage, engine torque, and transmission input shaft rotational speed.

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