Method and control device for operating a shifting element of a motor vehicle

Abstract

The invention relates to a method and a control device for operating a shift element of a motor vehicle. Wherein the shifting element (10) has a shifting sleeve (12), which can be actuated by an actuator (13) via a shifting fork (15) and which can be displaced in a translatory manner from an actual position into a target position in order to carry out a shift via the shifting fork (15), the actuator (13) actuating the shifting fork in an actuation direction predefined for the shift to be carried out. After the shift sleeve (12) is displaced from the actual position into the target position, the shift sleeve (12) is maintained in the target position by actuating the shift fork (15) by means of the actuator (13) counter to an actuation direction predefined for the shift to be carried out.

Description

Technical Field

[0001] This invention relates to a method for operating a gear shifting element in a motor vehicle. The invention also relates to a control device for performing this method. Background Technology

[0002] DE102018207590A1 discloses a shifting element for a motor vehicle. The shifting element has a shift sleeve that can be operated by an actuator via a shift fork. The actuator displaces the shift fork, and according to its operation, the shift fork displaces the shift sleeve via a shift fork head. This allows the shift sleeve to be translated from its actual position to a target position by controlling the actuator.

[0003] After the shift sleeve has shifted to its desired target position, the actuator is deactivated, i.e., no more current is supplied. This leaves the shift fork in the position that caused the shift sleeve to shift to the target position, resulting in persistent contact between the shift fork, particularly the shift fork head, and the shift sleeve, which can cause wear. Summary of the Invention

[0004] There is an urgent need for a transmission shift element having a shift sleeve operable by an actuator via a shift fork, capable of operation with reduced risk of wear. The object of this invention is to provide a novel method and control apparatus for operating a shift element in a motor vehicle. This object is achieved by the method according to claim 1 and the control apparatus according to claim 5.

[0005] According to the present invention, after the shift sleeve is moved from the actual position to the target position, the shift fork is operated in the reverse direction of the predetermined operation direction for the shift to be performed by the actuator, thereby maintaining the shift sleeve in the target position.

[0006] According to the present invention, after the shift sleeve is moved to its target position, the shift fork is operated in the reverse direction of the predetermined operation direction for the shift to be performed via the actuator, thereby maintaining the shift sleeve in the target position. After the shift sleeve is moved to the target position, the shift fork is slightly moved in the reverse operation direction to maintain the shift sleeve in the target position on the one hand, and to avoid prolonged contact with the shift sleeve and thus avoid prolonged axial collision with the shift sleeve, thereby reducing the risk of wear.

[0007] Preferably, after the shift sleeve moves from the actual position to the target position, the shift fork is operated in the reverse direction of the predetermined operation direction for the shift to be performed via the actuator, so that there is no contact between the shift fork and the shift sleeve as the operation is reversed in the predetermined operation direction for the shift to be performed, which is particularly beneficial to reducing the risk of wear.

[0008] Preferably, the shift fork engages with a groove in the shift sleeve, and then, as the shift sleeve moves from its actual position to its target position, the shift fork abuts against the wall of the groove. After the shift sleeve has moved from its actual position to its target position, the shift fork is manipulated by the actuator in the reverse direction of the predetermined operation for the shift to be performed, preferably so that the shift fork subsequently does not abut against the wall of the groove. For this purpose, particularly by manipulating the shift fork in the reverse direction of the predetermined operation for the shift to be performed to move it to half the groove width of the shift sleeve's groove, or approximately half the groove width, also helps to reduce the risk of wear. Attached Figure Description

[0009] Preferred improvements are described in the dependent claims and the following description. Embodiments of the invention are illustrated in detail with reference to the accompanying drawings, but are not limited thereto. In the figures:

[0010] Figure 1 A schematic diagram showing the height of a gear shifting element for operating a motor vehicle according to the present invention is provided. Detailed Implementation

[0011] Figure 1 A height schematic diagram of a shift element 10 in a motor vehicle, particularly a transmission, is shown, wherein the shift element 10 has a shift sleeve 12 capable of translational displacement in the direction of double arrow 11. An actuator 13 is used to displace the shift sleeve 12, which displaces the shift sleeve 11 via a shift lever 14 and a shift fork 15. The actuator 13 may be an electric motor, whose rotational motion is converted into translational motion of the shift lever 14 and the shift fork 15. The translational motion of the shift lever 14 and the shift fork 15 is visually represented by double arrow 16.

[0012] The control device 17 is used to manipulate the actuator 13, and according to the dashed double arrow 18, the control device exchanges data with the actuator 13.

[0013] To perform a gear shift, the shift sleeve 12 is moved from its actual position to its target position by the control device 17 to energize the actuator 13 so as to manipulate the shift fork 15 in the predetermined operating direction for the gear shift to be performed, and to move the shift sleeve 12 to its target position in a defined manner via the shift fork 15.

[0014] According to the present invention, after the shift sleeve 12 is moved from the actual position to the target position, the shift fork 15 is manipulated in the reverse direction of the predetermined operation for the shift to be performed via the actuator 13, thereby maintaining the shift sleeve 12 in the target position. In this embodiment, as the operation is performed in the reverse direction of the predetermined operation for the shift to be performed, there is no longer any contact between the shift fork 15 and the shift sleeve 12. Therefore, after the shift sleeve 12 is moved to the target position, there is no longer any permanent contact between the shift fork 15 and the shift sleeve 12, and thus no permanent axial collision occurs between the shift fork 15 and the shift sleeve 12.

[0015] exist Figure 1 In one embodiment, the shift sleeve 12 has a groove 19, and a portion of the shift fork 15 extends into the groove, wherein this portion of the shift fork 15 extending into the groove 19 is also referred to as the shift fork head. To shift the shift sleeve 12 from its actual position to a corresponding target position, the portion of the shift fork 15 extending into the groove 19 abuts against the wall 19a or 19b of the groove 19. If Figure 1 If the shift fork is moved to the right, the portion of the shift fork 15 extending into the groove 19 abuts against the wall 19a. Conversely, if Figure 1 If the shift sleeve 12 is moved to the left, the shift fork 15 will abut against the wall 19b of the groove 19 with the part of it extending into the groove 19.

[0016] After the shift sleeve 12 is moved to its target position, the shift fork 15 is operated in the reverse direction of the predetermined operation for the shift to be performed via the actuator 13, thereby maintaining the shift sleeve 12 in the target position. That is, the shift fork 15 will not subsequently abut against the walls 19a and 19b of the groove 19 with its portion extending into the groove 19. For this purpose, in particular, the shift fork 15 is moved by the actuator 13 in the reverse direction of the predetermined operation for the shift to be performed to half or about half the width of the groove 19 of the shift sleeve 12, so that the portion of the shift fork 15 extending into the groove 19 is arranged approximately in the center of the groove and does not contact the two walls 19a and 19b.

[0017] The present invention also relates to a control device for a motor vehicle, which is configured to automatically execute the above-described method on the control side.

[0018] Therefore, in order to perform a gear shift, the control device 10 operates the actuator 13 by feeding power to it, thereby manipulating the shift fork 15 in the predetermined operating direction for the gear shift to be performed. In this case, the shift sleeve 12 is moved from its actual position to the corresponding target position for the gear shift to be performed by translation.

[0019] According to the present invention, after the shift sleeve 12 is moved from the actual position to the target position for the shift to be performed, the control device 17 manipulates the actuator 13 to manipulate the shift fork 15 in the reverse direction of the predetermined operation direction for the shift to be performed, thereby maintaining the shift sleeve 12 in the target position, and then ensuring that there is no permanent contact between the shift sleeve 12 and the shift fork 15.

[0020] The control device 17 according to the invention is preferably an electronic control device equipped with hardware and software tools for performing the method according to the invention. The hardware tools include a data interface for exchanging data with modules involved in performing the method according to the invention, such as exchanging data with actuator 13. Furthermore, the hardware tools also include a data interface for exchanging data with modules involved in implementing the method according to the invention. Additionally, the hardware tools include a processor for data processing and a memory for data storage. The software tools include program modules that execute in the control device to implement the method according to the invention.

[0021] List of reference numerals

[0022] 10 shift elements

[0023] 11. Shift sleeve displacement

[0024] 12-speed shift sleeve

[0025] 13 actuators

[0026] 14 gear shift levers

[0027] 15 Shift Fork

[0028] 16. Shift lever and shift fork displacement

[0029] 17 Control Equipment

[0030] 18 Data Exchange

[0031] 19 grooves

[0032] 19a wall

[0033] 19b wall

Claims

1. A method for operating a shifting element (10) in a motor vehicle, in, The shifting element (10) has a shift sleeve (12) operable by an actuator (13) via a shift fork (15), wherein the shift sleeve (12) is shifted from an actual position to a target position in a translational manner to perform a shift via the shift fork (15), and the actuator (13) operates the shift fork in a predetermined operating direction for the shift to be performed. Its features are, After the shift sleeve (12) is moved from the actual position to the target position, the shift fork (15) is manipulated in the opposite direction of the predetermined operation direction for the shift to be performed via the actuator (13) to maintain the shift sleeve (12) in the target position.

2. The method according to claim 1, characterized in that, After the shift sleeve (12) is moved from the actual position to the target position, the shift fork (15) is manipulated in the opposite direction of the predetermined operation direction for the shift to be performed via the actuator (13), such that there is no contact between the shift fork (15) and the shift sleeve (12) as the operation is reversed in the opposite direction of the predetermined operation direction for the shift to be performed.

3. The method according to claim 1 or 2, characterized in that, The shift fork (15) is fitted into the groove (19) in the shift sleeve (12), and when the shift sleeve (12) moves from the actual position to the target position, the shift fork abuts against the wall (19a, 19b) of the groove (19). After the shift sleeve (12) is moved from the actual position to the target position, the shift fork (15) is manipulated in the opposite direction of the predetermined operation direction for the shift to be performed via the actuator (13) so that the shift fork (15) does not abut against the wall (19a, 19b) of the groove (19).

4. The method according to claim 3, characterized in that, After the shift sleeve (12) is moved from the actual position to the target position, the shift fork (15) is moved by the actuator (13) in the opposite direction to the predetermined operation direction for the shift to be performed, by about half the width of the groove (19) in the shift sleeve (12).

5. Control device (17) for a gear shifting element (10) for operating a motor vehicle. in, The control device (17) manipulates the actuator (13) of the shift element (10) to perform a gear shift, thereby causing the shift sleeve (12) of the shift element (10) to be moved from its actual position to its target position via the shift fork (15) of the shift element (10). The actuator (17) manipulates the shift fork in the predetermined operating direction for the gear shift to be performed. Its features are, After the shift sleeve (12) is moved from the actual position to the target position, the control device (17) manipulates the actuator (13) to manipulate the shift fork (15) in the opposite direction to the predetermined operation direction for the shift to be performed, thereby maintaining the shift sleeve (12) in the target position.

6. The control device according to claim 5, characterized in that, The control device is configured to automatically execute the method according to any one of claims 1 to 4 on the control side.

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