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CN-122029367-A - Method for calibrating a travel sensor assembly of a motor vehicle drive train

CN122029367ACN 122029367 ACN122029367 ACN 122029367ACN-122029367-A

Abstract

The invention relates to a method for calibrating a travel sensor assembly (44) of a drive train (10) of a motor vehicle, wherein the drive train (10) has a drive motor (14) and a transmission (18), via which the drive motor (14) can drive the motor vehicle. The transmission (18) comprises a first transmission element (12), a second transmission element (28 b), a dog clutch (SE 3), an actuation device (40) and a rotational speed sensor assembly (50). At least one of the transmission elements (12, 28 b) is rotatably supported such that the transmission elements (12, 28 b) are rotatable relative to each other. The claw clutch (SE 3) is designed to connect the first transmission element (12) to the second transmission element (28 b) in a rotationally fixed manner. The dog clutch (SE 3) comprises a first clutch half (36) connected to the first transmission element (12) in a rotationally fixed manner and a second clutch half (38) connected to the second transmission element (28 b) in a rotationally fixed manner. The actuating device (40) is designed to displace the first clutch half (36) along the rotational axis of the transmission (18).

Inventors

  • D. Winter
  • M. Renfield
  • M. Notre
  • L. BECKER
  • T. Dorst
  • J. Hakkh

Assignees

  • 梅赛德斯-奔驰集团股份公司

Dates

Publication Date
20260512
Application Date
20240802
Priority Date
20231011

Claims (10)

  1. 1. A method for calibrating a travel sensor assembly (44) of a motor vehicle driveline (10), wherein: -the drive train (10) has a drive motor (14) and a transmission (18) via which the drive motor (14) can drive the motor vehicle; -the transmission (18) has a first transmission element (12), a second transmission element (28 b), a dog clutch (SE 3), an actuation device (40) and a rotation speed sensor assembly (50); -at least one of the transmission elements (12, 28 b) is rotatably supported such that the transmission elements (12, 28 b) are rotatable relative to each other; -the dog clutch (SE 3) is designed to connect the first transmission element (12) to the second transmission element (28 b) torsionally; -the dog clutch (SE 3) has a first clutch half (36) torsionally connected to the first transmission element (12) and a second clutch half (38) torsionally connected to the second transmission element (28 b); -the actuation means (40) are designed to displace the first clutch half (36) along the rotation axis of the transmission (18); -the travel sensor assembly (44) has an information transmitter (46) fixedly connected to the first clutch half (36) and a travel sensor element (48), and -The rotational speed sensor assembly (50) is designed to detect the angular position of the at least one transmission element (28 b); It is characterized in that the method comprises the steps of, -In a transmission state of the transmission (18): -moving the first clutch half (36) along a rotation axis towards the second clutch half (38) by means of the actuation means (40) until the closed state of the dog clutch (SE 3); A first travel sensor signal is assigned to the closed state, which is provided by the travel sensor assembly (44) in the closed state and characterizes a first position of the information transmitter (46) detected in the closed state by means of the travel sensor element (48); the claw clutch (SE 3) is disengaged and thus converted into a disengaged state of the claw clutch (SE 3), and the transmission element (12, 28 b) is then rotated relative to one another by a rotational angle by means of the drive motor (14) and by means of the rotational speed sensor assembly (50); -moving the first clutch half (36) along a rotation axis towards the second clutch half (28 b) by means of the actuation device (40) until a first tooth-to-tooth state of the dog clutch (SE 3); A second travel sensor signal is assigned to the first tooth-to-tooth state, which is provided by the travel sensor assembly (44) in the first tooth-to-tooth state and characterizes a second position of the information transmitter (46) detected by means of the travel sensor element (48) in the first tooth-to-tooth state, and Calibrating the travel sensor assembly (44) based on the first travel sensor signal and the second travel sensor signal.
  2. 2. The method according to claim 1, It is characterized in that the method comprises the steps of, The drive train (10) has a housing (12), to which the first clutch half (36) is connected in a rotationally fixed manner.
  3. 3. The method according to claim 2, It is characterized in that the method comprises the steps of, The second clutch half (38) is rotatable relative to the housing (12).
  4. 4. The method according to any of the preceding claims, It is characterized in that the method comprises the steps of, The torsion angle corresponds at most to the tooth width of the teeth (58, 60, 64, 68) of the dog clutch (SE 3).
  5. 5. The method according to any of the preceding claims, It is characterized in that the method comprises the steps of, -The clutch halves (36, 38) each have a snap tooth (58, 64) and a locking tooth (60, 66); -moving the first clutch half (36) along a rotation axis towards the second clutch half (38) by means of the actuation device (40) until a second tooth-to-tooth state of the dog clutch (SE 3); -in the second tooth-to-tooth condition of the dog clutch (SE 3), at least one of the engagement teeth (58, 64) of one of the clutch halves (36, 38) is located on one of the locking teeth (60, 66) of the other clutch half (36, 38); -a third travel sensor signal is assigned to the second tooth-to-tooth state, which is provided by the travel sensor assembly (44) in the second tooth-to-tooth state and characterizes a third position of the information transmitter (46) detected by means of the travel sensor element (48) in the second tooth-to-tooth state, and -Calibrating the travel sensor assembly (44) also in dependence of the third travel sensor signal.
  6. 6. The method according to claim 5, It is characterized in that the method comprises the steps of, In the first tooth-to-tooth state of the dog clutch (SE 3), at least one of the engagement teeth (58, 64) of the one clutch half (36, 38) is located on at least one of the engagement teeth (58, 64) of the other clutch half (36, 38).
  7. 7. The method according to claim 5 and 6, It is characterized in that the method comprises the steps of, The respective engagement teeth (58, 64) of the respective clutch half (36, 38) are longer than the respective locking teeth (60, 66) of the respective clutch half (36, 38) as seen along the rotational axis.
  8. 8. The method according to any of the preceding claims, It is characterized in that the method comprises the steps of, In the transmission state: -the transmission element (12, 28 b) is stationary, or -At least one or exactly one of the transmission elements (12, 28 b) rotates at a rotational speed smaller than a specified threshold.
  9. 9. The method according to any of the preceding claims, It is characterized in that the method comprises the steps of, In the transmission state: -no relative rotation between the transmission elements (12, 28 b) takes place, or -The transmission elements (12, 28 b) rotate relative to each other at a rotational speed less than a specified limit.
  10. 10. The method according to any of the preceding claims, It is characterized in that the method comprises the steps of, In the gear state, no actuation of the gear element (12, 28 b) by means of the drive motor (14) takes place.

Description

Method for calibrating a travel sensor assembly of a motor vehicle drive train Technical Field The present invention relates to a method for calibrating a travel sensor assembly of a motor vehicle drive train according to the preamble of patent claim 1. Background A known method for controlling an automated friction clutch arranged between an internal combustion engine and a multi-gear transmission in a motor vehicle drive train, which friction clutch has a clutch path to be travelled between an open and a closed state, is known from DE 10 2008 044 823 A1, wherein the clutch path is detected as a function of a path increment of the sensor which varies in the clutch path, and the sensor is calibrated in a defined position when the friction clutch is completely disengaged. It is furthermore provided that if the calibration fails, the closing process of the friction clutch will be slowed down compared to if the calibration is normally completed. DE 10 2013 226 516 A1 describes a measuring assembly by means of which the rotational direction, rotational speed, rotational position and axial position of the rotating assembly of the dog clutch can be determined. Disclosure of Invention The object of the present invention is to create a method for calibrating a travel sensor assembly of a motor vehicle drive train in order to be able to calibrate the travel sensor assembly in a particularly advantageous manner. This object is achieved by a method having the features of patent claim 1. Advantageous embodiments with suitable developments of the invention are given in the remaining claims. The invention relates to a method for calibrating a travel sensor assembly of a drive train of a motor vehicle (also referred to as a vehicle, preferably designed as a motor vehicle, in particular a passenger car). Calibration of the travel sensor assembly is also known as fine tuning or calibration of the travel sensor assembly. In particular, the calibration according to the invention, i.e. the method according to the invention, is a fine calibration of the travel sensor assembly. In this method, the drive train has a drive motor and a transmission via which the motor vehicle can be driven by the drive motor. The drive motor may be an internal combustion engine, i.e. an internal combustion engine, or the drive motor may be an electric motor, by means of which the motor vehicle can be driven electrically, in particular in a purely electric manner, via a transmission. The transmission has a first transmission element, a second transmission element, a dog clutch, an actuation device, and a speed sensor assembly. For example, a drive train, in particular a transmission, has a housing, wherein it is possible for the first transmission element and/or the second transmission element to be arranged in the housing. Furthermore, it is conceivable that the housing is, for example, one of the transmission elements, wherein, for example, a further transmission element can be arranged in the housing. Furthermore, it is possible for the claw clutch and/or the actuating device and/or the rotational speed sensor assembly and/or the travel sensor assembly to be arranged in the housing. At least one transmission element is rotatably supported, whereby the transmission elements are rotatable relative to each other, in particular about a transmission element rotation axis. Thus, for example, the at least one transmission element is rotatable relative to the housing about the transmission element axis of rotation, whereby the at least one transmission element is supported in a manner rotatable relative to the housing about the transmission element axis of rotation. It is conceivable that the two transmission elements are rotatably supported, so that for example the two transmission elements, i.e. the first transmission element and the second transmission element, can rotate about the transmission element rotation axis relative to the housing and are thus supported relative to the housing. Alternatively, it is conceivable that the at least one transmission element is rotatably supported and is thus rotatable about a transmission element rotation axis relative to the housing and relative to a further transmission element, wherein the further transmission element is connected to the housing in a rotationally fixed manner. The dog clutch is designed to connect the first transmission element to the second transmission element torsionally. In other words, the transmission elements can be connected to one another in a rotationally fixed manner by means of a claw clutch. The dog clutch has a first clutch half connected to the first transmission element in a rotationally fixed manner and a second clutch half connected to the second transmission element in a rotationally fixed manner. For example, the clutch halves can be connected to one another in a rotationally fixed manner, wherein the transmission elements can be connected to one another in a rotationally fi