KR101990046B1 - Method for diagnosing clutch stuck and apparatus thereof - Google Patents

Abstract

The present invention relates to a method for diagnosing a clutch stuck and a device thereof. The method comprises: a step in which a control unit determines whether a stuck state diagnosis start condition of a clutch is satisfied based on control duty of an operating current applied to a clutch actuator performing an engaging operation and a release operation of the clutch and an actual pressure applied to the clutch; a step in which the control unit compares the actual pressure and a preset target pressure to firstly diagnose the clutch stuck when it is determined that the stuck state diagnosis start condition of the clutch is satisfied; and a step in which the control unit determines whether the stuck state of the clutch is in an open struck state or a closed stuck state based on the actual pressure and finally diagnosis the stuck state of the clutch when it is determined that the clutch is stuck as a result of the first diagnosis. According to the present invention, it is possible to prevent accidents caused by the clutch stuck and to eliminate the loss of torque transmitted from an engine.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for fixing a clutch,

The present invention relates to a method and an apparatus for diagnosing clutch fastening, and more particularly, to a clutch fastening diagnostic method and apparatus for diagnosing the fastening of a clutch that can not control the operation of a clutch mounted on a transmission.

The transmission means a device mounted on a vehicle or the like for generating an appropriate-sized rotational speed and torque through a torque generating means such as an engine or a motor. Such a transmission can be represented by a manual transmission in which shifting is performed in accordance with a manual operation of a driver, and an automatic transmission in which a shift is automatically performed in response to a vehicle speed or an engine load. Currently, automatic transmission is widely used.

As one of such automatic transmissions, a dual clutch transmission (DCT) having two power transmission clutches has been developed. The dual clutch transmission selectively transmits the rotational force input from the engine to the two input sides using two clutches and outputs the output after shifting by using the rotational force of the gears disposed on the two input sides. So that there is almost no disconnection of the power even during shifting. Also, since there is no acceleration stop sensation generated in the single plate clutch, there is an advantage that the shifting feeling is very excellent.

On the other hand, in such an automatic transmission, there may occur a clutch sticking problem in which the clutch mounted therein is fixed in a specific state and its operation can not be controlled. For example, when the transmission input shaft rotational speed is detected as a value similar to the engine rotational speed even though the clutch is in a fully disengaged state such as when the vehicle is in an idle state, (Closed Stuck), and when the idle state of the vehicle is released and the gear is engaged in the fixed state of the clutch, there is a possibility of causing a serious accident due to sudden driving of the vehicle. Further, when the clutch is fixed in the released state (Open Stuck), there is a problem that the clutch can not be controlled to be in the engaged state, resulting in loss of torque transmitted from the engine.

The background art of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2010-0089221 (published on Aug. 12, 2010).

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above problems, and it is an object of one aspect of the present invention to provide a torque converter that prevents an accident caused by clutch engagement by diagnosing the fastening of a clutch mounted on a transmission, And to provide a clutch fixing diagnosis method and apparatus capable of eliminating losses.

The clutch fixing diagnosis method according to one aspect of the present invention is characterized in that the control section controls the duty ratio of the clutch based on the control duty of the operating current applied to the clutch actuator performing the clutch operation and the clutch release operation, The control unit compares the actual pressure and a predetermined target pressure to determine whether or not the stuck condition of the clutch is satisfied, And when the diagnosis is made that the clutch is in a fixed state as a result of the primary diagnosis, the control unit determines whether the fixed state of the clutch is an open stuck state or a closed state based on the actual pressure, (Closed Stuck) state and final diagnosis of the attachment of the clutch The features.

In the determining step, the control unit may determine that the fixing diagnosis start condition of the clutch is satisfied if the control duty is equal to or greater than a preset reference duty and the actual pressure is equal to or greater than a predetermined first reference pressure .

The present invention is characterized in that, in the first diagnosis step, the control unit makes a first diagnosis that the clutch is in a fixed state if the pressure corresponding to the difference between the actual pressure and the target pressure is equal to or greater than a preset second reference pressure .

In the present invention, the target pressure is preset to a value corresponding to the control duty.

In the present invention, the clutch is a dual clutch mounted on a wet dual clutch transmission (Wet-DCT: Wet-Dual Clutch Transmission).

According to an aspect of the present invention, there is provided a clutch fixing diagnosis apparatus comprising a clutch for interrupting power supplied from an engine to a transmission, a clutch actuator for performing a clutch operation and a clutch release operation of the clutch, a pressure sensor for sensing an actual pressure applied to the clutch And a control duty of the operating current applied to the clutch actuator and an actually measured pressure sensed by the pressure sensor, it is judged that the fixation diagnosis start condition of the clutch is satisfied, the actual pressure and the preset target pressure And when the clutch is in a fixed state and the first diagnosis is made, it is determined whether the fixed state of the clutch is the open stuck state or the closed state based on the actual pressure, (Closed Stuck) state and a final diagnosis of fixing of the clutch It characterized in that it comprises a.

According to one aspect of the present invention, the present invention diagnoses the attachment of a clutch mounted on a transmission, thereby preventing accidents caused by clutch sticking, and eliminating the loss of torque transmitted from the engine. The driving stability of the vehicle can be improved by applying the clutch fixing diagnosis logic to the dual clutch transmission and controlling the transmission so as to avoid a state in which both clutches are engaged based on the diagnosis result of the clutch fixing.

1 is a block diagram illustrating a clutch fixing diagnostic apparatus according to an embodiment of the present invention.
2 is a flowchart for explaining a method of fixing a clutch according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a clutch fixing diagnosis method and apparatus according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a block diagram illustrating a clutch fixing diagnostic apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a clutch fixing diagnostic apparatus according to an embodiment of the present invention may include a clutch 10, a clutch actuator 20, a pressure sensor 30, and a control unit 40.

In the present embodiment, the clutch 10 is a dual clutch mounted on a wet dual clutch transmission (Wet-DCT) as an example. However, the present invention is not limited to this and may be applied to various types of transmission such as an automatic transmission and a continuously variable transmission As shown in Fig.

The clutch 10 is capable of interrupting the power supplied from the engine to the transmission. To this end, the clutch 10 may be applied to a conventional clutch, such as a release member such as a release bearing or a thrust bearing, a resilient member such as a diaphragm spring, a pressure plate, Wheel (not shown).

The clutch actuator 20 is controlled in duty according to the operation current applied by the control of the control unit 40 to be described later, so that the clutch actuator 20 can perform the engagement and disengagement operations of the clutch 10. [ The clutch actuator 20 according to the present embodiment may be implemented as a solenoid actuator which is a motor as an electric actuator or a hydraulic actuator. The clutch actuator 20 is designed to be mechanically connected to the pressing member of the clutch 10 via a screw shaft and a screw nut to press the pressing member.

The pressure sensor 30 can sense the actual pressure applied to the clutch 10 and more specifically the clutch actuator 20 measures the pressure at which the pressing member of the clutch 10 is pressed and transmits the pressure to the control unit 40 . The actual pressure sensed by the pressure sensor 30 can be used to determine whether or not the fixing diagnosis start condition of the clutch 10 is satisfied as will be described later and can be used in the primary diagnosis and final diagnosis of the fixing of the clutch 10 have.

If the control unit 40 determines that the fixing diagnosis start condition of the clutch 10 is satisfied based on the control duty of the operating current applied to the clutch actuator 20 and the actual pressure sensed by the pressure sensor 30 The stall of the clutch 10 is first diagnosed by comparing the actual pressure and the preset target pressure and when the clutch 10 is first diagnosed as being in a fixed state, It is judged whether the fastened state is an open stuck state or a closed stuck state so that the fastening of the clutch 10 can be finally diagnosed.

Hereinafter, a process of the controller 40 diagnosing the fixing of the clutch will be described in detail with reference to FIG.

2 is a flowchart for explaining a method of fixing a clutch according to an embodiment of the present invention.

2, the control unit 40 controls the duty of the operating current applied to the clutch actuator 20 and the actual duty ratio of the clutch 10 applied to the clutch 10, It is determined whether or not the fixation diagnosis start condition of the clutch 10 is satisfied based on the pressure (S10). Step S10 is meaningful as a step of starting the fixing diagnosis of the clutch 10 by confirming that the intermittent operation of the clutch 10 is being performed in accordance with the operation of the clutch actuator 20. [

In step S10, the control unit 40 determines that the fixation diagnosis start condition of the clutch 10 is satisfied when the control duty is equal to or greater than a preset reference duty and the actual pressure is equal to or greater than a preset first reference pressure.

Here, the reference duty is used to confirm that the clutch actuator 20 is operating, and to set the clutch 10 to the target position at which the clutch 10 should be positioned in order to diagnose whether or not the clutch 10 is fixed Can be set in advance as the target duty of the operating current required for the clutch actuator 20 and the first reference pressure can be preset as the pressure for confirming that the predetermined pressure is actually applied to the clutch 10. [ Accordingly, when the control duty is equal to or greater than a preset reference duty and the actual pressure is equal to or greater than a preset first reference pressure, it is determined that an environment capable of diagnosing the fixation of the clutch 10 is formed, And the fixing diagnosis of the clutch 10 is started through step S30.

If it is determined in step S10 that the fixation diagnosis start condition of the clutch 10 is satisfied, the control unit 40 compares the actual pressure and a preset target pressure to first diagnose the stuck of the clutch 10 S20). Step S20 is a step of diagnosing whether or not the clutch 10 is in a fixed state, including an open stuck state and a closed stuck state, which will be described later.

Here, the target pressure may be set in advance to a value corresponding to the control duty of the operating current applied to the clutch actuator 20. Accordingly, in step S20, the control unit 40 sets the pressure corresponding to the difference between the actual pressure and the target pressure It is possible to perform a first diagnosis that the clutch 10 is in a fixed state.

That is, when it is determined that the control duty of the operating current applied to the clutch actuator 20 is equal to or greater than the reference duty in step S10, the target pressure corresponding to this control duty must be applied to the clutch 10 by the clutch actuator 20 And if the pressure corresponding to the difference between the actual pressure applied to the clutch 10 (that is, the actual pressure sensed by the pressure sensor 30) and the target pressure is equal to or greater than a preset second reference pressure, It can be determined that the target pressure corresponding to the control duty is not applied to the clutch 10 due to the fixing, so that the control unit 40 can diagnose that the clutch 10 is in a fixed state. The second reference pressure may be variously designed on the basis of the intention of the designer and the experimental result, and may be preset in the control unit 40. [

If it is diagnosed that the clutch 10 is in a fixed state as a result of the first diagnosis in the step S20, the control unit 40 determines whether the fixed state of the clutch 10 is an open stuck state or a closed state, It is determined whether the clutch 10 is in the closed stuck state and the clutch 10 is finally diagnosed (S30).

That is, when the actual pressure is included in the range of the pressure (denoted by the open pressure region for convenience) applied to the clutch 10 in the open state (i.e., released state) of the clutch 10, 10 can be diagnosed as being in the open fixed state and the actual pressure is expressed as the range of the pressure applied to the clutch 10 in the closed state (i.e., the engaged state) of the clutch 10 , The control unit 40 can diagnose that the clutch 10 is in the closed and fixed state. The open pressure area and the closed pressure area may be variously designed on the basis of the designer's intention and the experimental results and set in the control part 40 in advance.

As described above, in the present embodiment, the clutch 10 may be implemented as a dual clutch mounted on a wet dual clutch transmission (Wet-DCT), and accordingly, When the fixing is finally diagnosed, on the basis of the result of the final diagnosis of the fixation of the clutch 10, the control unit 40 controls the wet dual clutch transmission 10 so as to avoid the state where both of the first clutch and the second clutch included in the dual clutch are engaged. (S40).

For example, when the first clutch is finally diagnosed as being in the open fixed state, the control unit 40 can interlock the gear through the second clutch that is not in a fixed state (for example, When the clutch is in the open fixed state, the even-numbered gear interlocking is performed via the second clutch), and when the first clutch is finally diagnosed as being in the closed fixed state, the control unit 40 interrupts the gear via the first clutch (For example, when the first clutch for solenoid intermittent control is in a closed-engaged state, the second clutch for intermittent-gear interrupting maintains the disengaged state and performs the intermittent-to-intermittent intermittent control via the first clutch). Thus, the state in which both of the first clutch and the second clutch included in the dual clutch are engaged can be avoided. The first clutch and the second clutch may be clutches for intermittent gear intermittence and intermittent gear intermittent control, respectively, or conversely, clutches for intermittent intermittent gear intervention and intermittent intermittent gear interception, respectively. That is, the first clutch and the second clutch mean a clutch that performs complementary gear interlocking.

On the other hand, in the present embodiment, when the fixing of the clutch 10 is finally diagnosed, the control unit 40 outputs the final diagnosis result through a display on the cluster unit or a speaker or the like to inform the driver that the clutch 10 needs to be repaired It may further include an audio-visual warning step S50.

As described above, the present embodiment diagnoses the attachment of the clutch mounted on the transmission, thereby preventing an accident caused by the clutch fixing, eliminating the loss of the torque transmitted from the engine, and improving the clutch fixing diagnosis logic according to the present invention It is possible to improve the running safety of the vehicle by controlling the transmission so as to avoid a state in which both clutches are engaged based on the diagnosis result of the clutch fastening applied to the dual clutch transmission.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: Clutch
20: Clutch actuator
30: Pressure sensor
40:

Claims (10)

Wherein the control unit determines whether or not the fixation diagnosis start condition of the clutch is satisfied based on the control duty of the operation current applied to the clutch actuator performing the engagement and disengagement operations of the clutch and the actual pressure applied to the clutch ;
The control unit compares the actual pressure and a predetermined target pressure to make a first diagnosis of the stuck of the clutch when it is determined that the fixing diagnosis start condition of the clutch is satisfied; And
If it is determined that the clutch is in a fixed state as a result of the primary diagnosis, the control unit determines whether the fixed state of the clutch is an open stuck state or a closed stuck state based on the actual pressure Determining a final diagnosis of the attachment of the clutch;
Wherein the clutch is fixed to the clutch.
The method according to claim 1,
In the determining step,
Wherein when the control duty is equal to or greater than a predetermined reference duty and the actual pressure is equal to or greater than a predetermined first reference pressure, it is determined that the fixation diagnosis start condition of the clutch is satisfied.
The method according to claim 1,
In the primary diagnosis step,
When the pressure corresponding to the difference between the actual pressure and the target pressure is equal to or greater than a preset second reference pressure, the clutch is diagnosed as being in a fixed state.
The method of claim 3,
Wherein the target pressure is preset to a value corresponding to the control duty.
The method according to claim 1,
Wherein the clutch is a dual clutch mounted on a wet dual clutch transmission (Wet-DCT: Wet-Dual Clutch Transmission).
A clutch for interrupting power supplied from the engine to the transmission;
A clutch actuator for performing engagement and disengagement operations of the clutch;
A pressure sensor for sensing an actual pressure applied to the clutch; And
When it is determined that the fixing diagnosis start condition of the clutch is satisfied based on the control duty of the operating current applied to the clutch actuator and the actual pressure sensed by the pressure sensor, the actual pressure and the preset target pressure are compared The clutch is firstly diagnosed as being stuck, and when the clutch is first diagnosed as being in a fixed state, it is determined whether or not the fixed state of the clutch is an open stuck state or a closed state (Closed Stuck) state, and finally diagnoses the fixing of the clutch;
And the clutch fixing diagnostic device.
The method according to claim 6,
Wherein the controller determines that the fixation diagnosis start condition of the clutch is satisfied if the control duty is equal to or greater than a preset reference duty and the actual pressure is equal to or greater than a preset first reference pressure.
The method according to claim 6,
Wherein the control unit diagnoses that the clutch is in a fixed state if the pressure corresponding to the difference between the actual pressure and the target pressure is equal to or greater than a preset second reference pressure.
9. The method of claim 8,
Wherein the target pressure is preset to a value corresponding to the control duty.
The method according to claim 6,
Wherein the clutch is a dual clutch mounted on a wet dual clutch transmission (Wet-DCT: Wet-Dual Clutch Transmission).

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