阅读说明：本技术 用于诊断离合器卡滞的方法及其装置 (Method and device for diagnosing clutch jamming ) 是由 徐贤德 于 2018-04-25 设计创作，主要内容包括：本发明涉及一种卡滞诊断装置和方法。用于诊断离合器卡滞的方法的特征在于包括以下步骤：在离合器通过离合器致动器的驱动而接合之后,允许控制单元关闭离合器致动器；允许控制单元对从离合器致动器的关闭时间点经过的时间进行计数,以测量达到用于中断发动机动力的离合器分离状态所花费的时间；以及当离合器在预设的参考时间内没有达到分离状态时,允许控制单元确定在离合器中发生了卡滞。(The invention relates to a jamming diagnostic device and a method. The method for diagnosing clutch sticking is characterized by comprising the steps of: allowing the control unit to turn off the clutch actuator after the clutch is engaged by the driving of the clutch actuator; allowing the control unit to count an elapsed time from a closing time point of the clutch actuator to measure a time taken to reach a clutch release state for interrupting the power of the engine; and allowing the control unit to determine that jamming has occurred in the clutch when the clutch does not reach the disengaged state within a preset reference time.)

1. A method for diagnosing clutch stuttering, comprising the steps of:

allowing the control unit to close the clutch actuator after the clutch is engaged by driving of the clutch actuator;

allowing the control unit to count an elapsed time from a closing time point of the clutch actuator to measure a time taken to reach a clutch-off state for interrupting engine power; and

the control unit is allowed to determine that jamming has occurred in the clutch when the clutch does not reach the disengaged state within a preset reference time.

2. The method for diagnosing clutch stagnation according to claim 1, wherein the time taken to reach a clutch off-state is a self-open time due to a reaction force of an elastic member that is pressed by driving of a clutch actuator to engage or disengage the clutch.

3. The method for diagnosing clutch stagnation according to claim 2, wherein relationship information between a clutch position and a self-opening time in a normal state in which no stagnation occurs in the clutch is set in advance, and in the determining step, the control unit extracts the self-opening time with respect to the clutch position at a closing time point of the clutch actuator from the relationship information, and determines that the stagnation occurs in the clutch when the clutch does not reach the disengaged state within the extracted self-opening time.

4. An apparatus for diagnosing clutch stuttering, comprising:

a clutch that interrupts power supplied from the engine to the transmission;

a clutch actuator that controls engagement and disengagement of the clutch; and

a control unit that turns off the clutch actuator after the clutch is engaged by driving of the clutch actuator, counts an elapsed time from a turn-off time point of the clutch actuator to measure a time taken to reach a clutch release state for interrupting power of the engine, and determines that a stuck state occurs in the clutch when the clutch does not reach the release state within a preset reference time.

5. The apparatus for diagnosing clutch stagnation according to claim 4, wherein a time taken to reach a clutch off-state is a self-open time due to a reaction force of an elastic member that is pressed to engage or disengage the clutch by driving of a clutch actuator.

6. The apparatus for diagnosing clutch stagnation according to claim 5, wherein relationship information between a clutch position and a self-opening time in a normal state where no stagnation occurs in the clutch is previously set, and in the determining step, the control unit extracts the self-opening time with respect to the clutch position at a closing time point of the clutch actuator from the relationship information, and determines that the stagnation occurs in the clutch when the clutch does not reach the disengaged state within the extracted self-opening time.

7. The apparatus for diagnosing clutch stuttering of claim 4, wherein the clutch is a dual clutch mounted on a Dual Clutch Transmission (DCT).

Technical Field

The present invention relates to a clutch stuck diagnostic method and apparatus, and more particularly, to a clutch stuck diagnostic method and apparatus for diagnosing clutch stuck such that operation of a clutch mounted on a transmission is not controlled.

Background

A transmission is a device mounted on a vehicle and the like for generating appropriate rotational speed and torque by a torque generating device, such as an engine or an electric motor. Such a transmission may be represented by a manual transmission in which shifting is performed according to a manual operation by a driver, and an automatic transmission in which shifting is automatically performed according to a vehicle speed or an engine load. Currently, automatic transmissions are widely used.

As one of these automatic transmissions, a Dual Clutch Transmission (DCT) having two power transmission clutches has been developed. The dual clutch transmission selectively transmits a rotational force input from an engine to both input sides using two clutches, and alternately operates the two clutches to perform a gear shift based on a structure in which an output is achieved using rotational forces of gears provided on both input sides after the gear shift is performed. The advantage is therefore that torque interruption is less likely to occur even during a gear shift.

On the other hand, in such an automatic transmission, there may occur a problem of "clutch sticking", in which the operation of the transmission is not controlled because the clutch mounted in the transmission is fixed in an engaged state due to the clutch sticking. For example, when the rotation speed of the transmission input shaft is detected as a value similar to the engine rotation speed although the clutch is in a completely disengaged state, for example, when the vehicle is in an idling state, there is a possibility that the clutch is in a stuck state, and when the idling state of the vehicle is released and the gear is engaged in the stuck state of the clutch, there is a possibility that a serious accident is caused due to sudden traveling of the vehicle.

Further, conventionally, there has been a problem that only the post-operation with respect to the clutch sticking is possible because the stuck state of the clutch is determined only after the engine is started.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems, and it is an object according to one aspect of the present invention to provide a method and apparatus for diagnosing clutch seizure, by which the seizure of a clutch mounted on a transmission is diagnosed to prevent an accident from occurring, and the clutch seizure is diagnosed to prevent the possibility of the accident both before and after the engine is started.

A method for diagnosing clutch sticking according to one aspect of the present invention is characterized by comprising the steps of: allowing the control unit to turn off the clutch actuator after the clutch is engaged by the driving of the clutch actuator; allowing the control unit to count/time elapsed time from a closing time point of the clutch actuator so as to measure time required to reach a clutch-off state for interrupting engine power; and allowing the control unit to determine that jamming has occurred in the clutch when the clutch does not reach the disengaged state within a preset reference time.

In the present invention, the time taken to reach the clutch disengaged state may be a self-open time caused by a reaction force of an elastic member that is pressed by the driving of the clutch actuator to engage or disengage the clutch.

In the present invention, relationship information between a clutch position and a self-open time in a normal state in which no jamming occurs in the clutch may be set in advance, and in the determining step, the control unit may extract the self-open time with respect to the clutch position at a closing time point of the clutch actuator from the relationship information, and determine that the jamming occurs in the clutch when the clutch does not reach the disengaged state within the extracted self-open time.

An apparatus for diagnosing clutch seizure according to an aspect of the present invention is characterized by comprising: a clutch that interrupts power supplied from the engine to the transmission; a clutch actuator that controls engagement and disengagement of the clutch; and a control unit that turns off the clutch actuator after the clutch is engaged by driving of the clutch actuator, counts an elapsed time from a turn-off time point of the clutch actuator to measure a time taken to reach a clutch-off state for interrupting power of the engine, and determines that jamming has occurred in the clutch when the clutch does not reach the off state within a preset reference time.

In the present invention, the time taken to reach the clutch disengaged state may be a self-open time caused by a reaction force of an elastic member that is pressed by the driving of the clutch actuator to engage or disengage the clutch.

In the present invention, relationship information between the clutch position and the self-open time in a normal state in which no jamming occurs in the clutch may be set in advance, the control unit may extract the self-open time with respect to the clutch position of the clutch actuator at the closing time point from the relationship information, and determine that jamming occurs in the clutch when the clutch does not reach the disengaged state within the extracted self-open time.

In the present invention, the clutches may be dual clutches mounted on a Dual Clutch Transmission (DCT).

According to an aspect of the present invention, a stuck state of a clutch can be diagnosed early to prevent an accident due to clutch sticking, and a stuck diagnostic logic using only a self-open time without a separate additional component for diagnosing clutch sticking can be applied in order to diagnose clutch sticking, to more economically and efficiently diagnose clutch sticking.

Drawings

Fig. 1 is a block diagram for explaining an apparatus for diagnosing clutch sticking according to an embodiment of the present invention.

Fig. 2 and 3 are views for explaining clutch engagement and disengagement operations in the apparatus for diagnosing clutch stagnation according to the embodiment of the present invention.

Fig. 4 is a flowchart for explaining an apparatus for diagnosing clutch sticking according to an embodiment of the present invention.

Fig. 5 is a view for explaining and comparing a self-open time in a normal state and a self-open time in a clutch stuck state in a method for diagnosing clutch stuck according to an embodiment of the present invention.

Fig. 6 is a view showing an example of relationship information between a position of a clutch and a self-open time in a method for diagnosing clutch sticking according to an embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of a method and apparatus for diagnosing clutch sticking according to the present invention will be described with reference to the accompanying drawings. In the description, the width of lines or the size of parts shown in the drawings may be exaggerated for clarity and convenience of description. Further, the following terms are defined in consideration of functions in the present invention, and the definitions thereof may vary according to the intention or practice of a user or operator. Therefore, the definition of the terms should be based on the contents of the entire specification.

Fig. 1 is a block diagram for explaining an apparatus for diagnosing clutch stagnation according to an embodiment of the present invention, and fig. 2 and 3 are views for explaining clutch engagement and disengagement operations in the apparatus for diagnosing clutch stagnation according to an embodiment of the present invention.

Referring to fig. 1 to 3, an apparatus for diagnosing clutch seizure according to an embodiment of the present invention may include a clutch (10), a clutch actuator (20), and a control unit (30). The clutch (10) may include a pressing member (11), an elastic member (13), a pressure plate (15), a clutch plate (17), and a flywheel (19).

In this embodiment, although the dual clutch mounted on the dual clutch transmission is described as an example of the clutch (10) as shown in fig. 2 and 3, the present invention is not limited thereto, but may be applied to various clutches such as an automatic transmission and a continuously variable transmission.

The clutch (10) may interrupt power provided from the engine to the transmission. To this end, as shown in fig. 2 and 3, the clutch (10) may include a pressing member (11), an elastic member (13), a pressure plate (15), a clutch plate (17), and a flywheel (19). The pressing member (11) may be implemented by a separation bearing or a thrust bearing, and the elastic member (13) may be implemented by a diaphragm spring, but is not limited thereto.

The clutch actuator (20) may be controlled by a control unit described later to control engagement and disengagement of the clutch (10). A motor is used as an example of the clutch actuator (20) according to the embodiment, but is not limited thereto, and thus may be implemented as a solenoid actuator as a hydraulic actuator. The clutch actuator (20) may be designed to have a structure mechanically connected to the pressing member (11) by a screw and a nut. Thus, the rotational motion of the motor can be converted into a linear motion to press the pressing member (11).

The engaging and disengaging operations of the clutch (10) will be briefly described based on the above-described configurations of the clutch (10) and the clutch actuator (20) with reference to fig. 2 and 3.

Fig. 2 shows a state in which the clutch actuator (20) is closed to disengage the clutch (10). When the control unit (30) drives the clutch actuator (20), the rotational motion of the clutch actuator (20) may be converted into a linear motion by the screw and the nut to press the pressing member (11), and the elastic member (13) and the pressure plate (15) may be pressed by the pressing member (11) in one direction to engage the clutch plate (17) with the flywheel (19), so that the clutch (10) is engaged. Fig. 3 shows a state in which the clutch actuator (20) is driven to engage the clutch (10).

When the control unit (30) turns off the clutch actuator (20), the elastic member (13) returns to its original state by its elastic force to space the clutch plate (17) from the flywheel (19), thereby disengaging the clutch (10).

In this embodiment, although the dual clutch transmission is described as an example in which the clutch (10) is engaged when the clutch actuator (20) is driven and the clutch (10) is disengaged when the clutch actuator (20) is off, in some embodiments, the engagement and disengagement of the clutch (10) is achieved according to the operation of the clutch actuator (20).

This embodiment is characterized in that the seizure of the clutch (10) that may occur during normal operation of the above-described clutch (10) is diagnosed. Hereinafter, the configuration for diagnosing the seizure of the clutch (10) will be described in detail with reference to the operation of the control unit (30).

The control unit (30) may close the clutch actuator (20) after the clutch (10) is engaged by the driving of the clutch actuator (20), count an elapsed time from a closing time point of the clutch actuator (20) to measure a time taken to reach a disengaged state of the clutch (10) for interrupting the engine power, and determine that jamming has occurred in the clutch (10) when the clutch (10) does not reach the disengaged state within a preset reference time.

Here, the time taken to reach the disengaged state of the clutch (10) refers to a self-open time due to a reaction force of an elastic member (13) (i.e., a diaphragm spring) that is pressed by the driving of the clutch actuator (20) to engage or disengage the clutch (10).

Information on the relationship between the position of the clutch (10) and the self-open time in a normal state in which no sticking occurs in the clutch (10) is set in advance in the control unit (30). Therefore, the control unit (30) can extract the self-opening time relative to the position of the clutch (10) at the closing time point of the clutch actuator (20) from the relationship information, and determine that jamming has occurred in the clutch (10) when the clutch (10) does not reach the disengaged state within the extracted self-opening time.

Hereinafter, a process of diagnosing the clutch seizure by the control unit (30) will be described with reference to fig. 4 to 6.

Fig. 4 is a flowchart for explaining an apparatus for diagnosing clutch stagnation according to an embodiment of the present invention, fig. 5 is a view for explaining and comparing a self-open time in a normal state and a self-open time in a clutch stagnation state in a method for diagnosing clutch stagnation according to an embodiment of the present invention, and fig. 6 is a view showing an example of relationship information between a position of a clutch and the self-open time in a method for diagnosing clutch stagnation according to an embodiment of the present invention.

Referring to fig. 4, describing a method for diagnosing clutch sticking according to an embodiment of the present invention, first, the control unit (30) drives the clutch actuator (20) to engage the clutch (10), and then closes the clutch actuator (20). That is, as described below, the control unit (30) first confirms the engagement state of the clutch (10) (because the sticking of the clutch (10) is diagnosed based on the self-open time, which is the time taken to release the engagement of the clutch (10) in the state where the clutch (10) is engaged), and then turns off the clutch actuator (20) to measure the self-open time when the engagement state of the clutch (10) is confirmed.

Then, the control unit (30) counts the time elapsed from the closing time point of the clutch actuator (20) to measure the time taken to reach a disengaged state in which the clutch (10) interrupts the engine power. The disengaged state of the clutch (10) for interrupting the engine power is shown in fig. 2.

Here, the time taken to reach the disengaged state of the clutch (10) refers to a self-open time due to a reaction force of an elastic member (13) (i.e., a diaphragm spring) that is pressed by the driving of the clutch actuator (20) to engage or disengage the clutch (10).

In particular, the self-opening mechanism that is self-openable in an emergency may be applied to a dual clutch mounted on a dual clutch transmission, and is performed in accordance with the reaction force (i.e., elastic force) of the elastic member (13). That is, when the clutch actuator (20) is closed in a state where the clutch (10) is engaged, the elastic member (13) returns to its original state by a reaction force of the elastic member (13), and the pressure applied to the pressure plate (15) can be released to space the clutch plate (17) from the flywheel (19), so that the clutch (10) reaches a disengaged state. Therefore, the self-open time is defined as the time taken for the clutch actuator (20) to reach the disengaged state of the clutch (10) by the reaction force of the elastic member (13) from the closing time point in the engaged state of the clutch (10).

Then, the control unit (30) determines that jamming has occurred in the clutch (10) when the clutch (10) does not reach the disengaged state within a preset reference time.

Here, the reference time refers to a self-open time in a normal state where no jamming occurs in the clutch (10), and may be variously designed based on experimental results, and may be set in advance in the control unit (30).

Therefore, the control unit (30) counts the time elapsed from the closing time point of the clutch actuator (20), and determines that a considerably long self-opening time is required or that it is impossible to determine the self-opening time when the clutch (10) does not reach the disengaged state within the reference time, thereby determining that jamming has occurred in the clutch (10). Fig. 5 is a view for comparing the self-open time in the normal state and the self-open time in the clutch stuck state.

Information on the relationship between the position of the clutch (10) and the self-open time in a normal state in which no sticking occurs in the clutch (10) is set in advance in the control unit (30). Therefore, the control unit (30) can extract the self-opening time relative to the position of the clutch (10) at the closing time point of the clutch actuator (20) from the relationship information, and determine that jamming has occurred in the clutch (10) when the clutch (10) does not reach the disengaged state within the extracted self-opening time. Here, the position of the clutch (10) means the degree of engagement of the clutch (10), and is achieved by various parameters, such as the engagement pressure between the plate (17) and the flywheel (19) and the pressure applied to the elastic member (13).

In particular, as shown in fig. 6, the position of the clutch (10) and the self-open time taken to reach the disengaged state are proportional to each other, and although the position of the clutch (10) is variable in the state where the clutch actuator (20) is off, when the stuck state of the clutch (10) is diagnosed by applying a uniform reference time, the possibility of erroneous diagnosis is not excluded. Therefore, in this embodiment, in step S10, the self-open time with respect to the position of the clutch (10) at the closing time point of the clutch actuator (20) is extracted from the relationship information, and when the clutch (10) does not reach the disengaged state within the extracted self-open time, it can be determined that jamming has occurred in the clutch (10), thereby improving the accuracy of the jamming diagnosis of the clutch (10) in such a manner that the distinctive self-open time is applied in consideration of the position of the clutch (10) at the closing time point of the clutch actuator (20).

When it is determined that jamming has occurred in the clutch (10), the control unit (30) according to this embodiment may audibly alert the driver via a display or speaker on the cluster unit that the clutch (10) needs repair.

As described above, the clutch (10) according to the embodiment may be implemented as a dual clutch mounted on a dual clutch transmission. Therefore, the method for diagnosing clutch sticking according to this embodiment can be used to diagnose sticking on all clutches in the engaged state and in the disengaged state.

Further, in the method for diagnosing clutch seizure according to the present embodiment, the seizure of the clutch (10) can be diagnosed in such a manner that the self-open time of the clutch (10) is used regardless of whether the engine is running or off, and therefore, the state of the seizure of the clutch (10) can be detected not only after the engine is started but also before the engine is started.

As described above, in this embodiment, the stuck state of the clutch can be diagnosed early to prevent an accident from occurring due to clutch sticking, and a stuck diagnostic logic using only the self-open time can be applied without a separate additional component for diagnosing clutch sticking to diagnose clutch sticking, to more economically and efficiently diagnose clutch sticking.

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

10: clutch device

11: pressing member

13: elastic member

15: pressing plate

17: clutch disc

19: flywheel wheel

20: clutch actuator

30: control unit