Park Lock Torque Compensation for Smooth Release
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Solution Overview
Problem
Existing methods for operating motor vehicle drive train devices fail to accurately determine compensating torque to counteract tensioning torque when releasing the park lock device, leading to potential jolting and noise due to insufficient torque management.
Innovation Solution
Determine compensating torque based on the torsional angle and torsional stiffness of the torque transmission assembly, using a torsional pulse generator and longitudinal acceleration to ensure precise calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the park lock device is released without accurate compensating torque determination, then the release process is simple and quick, but jolting and noise occur due to insufficient torque management
Solution Approach 1:
The system performs preliminary determination of the compensating torque before releasing the park lock device. The control unit calculates the required compensating torque based on the tensioning torque that will be generated when the locking element is released, and applies this torque in advance through the drive unit to prevent jolting and noise during the release process.
Solution Approach 2:
The system uses feedback from sensors to detect the actual tensioning torque or the state of the torque transmission assembly, and the control unit adjusts the compensating torque accordingly. This closed-loop control ensures that the compensating torque accurately counteracts the tensioning torque, preventing harmful vibrations and noise while maintaining smooth operation.
2Measurement precision
If compensating torque is determined using torsional angle and torsional stiffness, then torque equalization accuracy is improved, but device complexity increases due to additional measurement requirements
Solution Approach 1:
The system utilizes the inherent torsional properties of the torque transmission assembly itself to determine the compensating torque. By measuring the torsional angle that naturally occurs in the assembly and combining it with the known torsional stiffness, the system calculates the compensating torque without requiring external complex measurement devices. The torque transmission assembly effectively serves its own measurement function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately equalizes tensioning torque, preventing jolting and noise during park lock release, ensuring smooth operation.
Implementation Method 1
a compensating torque is generated on the locking element by means of the drive unit, which compensating torque counteracts a tensioning torque caused by a tensioning of the torque transmission assembly when the locking element is fixed
Data Source
AI summary
A method for operating a motor vehicle drive train device for a motor vehicle, which includes a motor, connected at least temporarily to at least one wheel of the motor vehicle via a torque transmission assembly, and a park lock device. The park lock device form-fittingly fixes a locking element coupled in a rotationally fixed manner to the torque transmission assembly in a first setting and releases in a second setting and, when the park lock device is switched from the first setting to the second setting, a compensating torque is generated on the locking element by the motor, which compensating torque counteracts a tensioning torque by a tensioning of the torque transmission assembly when the locking element is fixed. The compensating torque is determined from a torsional angle of the torque transmission assembly determined after fixing of the locking element and a torsional stiffness of the torque transmission assembly.