Clutch Calibration Timing for Torque Matching Under Plate Wear
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Solution Overview
Problem
Clutch devices in motor vehicles experience deviations in actual torque transmission due to wear and changing coefficients of friction, leading to a mismatch between target and actual torque, which conventional calibration methods fail to adequately address, especially during the initial setting behavior of new clutch plates.
Innovation Solution
A method involving multiple calibrations of the clutch device, with shorter intervals in the initial operating time based on energy input and longer intervals in subsequent times based on mileage, to adjust the kiss point and minimize torque deviation, using a control unit to determine and adjust the calibration intervals and actuate the clutch plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional calibration is performed after specified mileage or energy input, then the calibration compensates wear and raises the kiss point, but the actual torque deviates from target torque during the initial setting behavior period
Solution Approach 1:
The calibration interval is made dynamic rather than fixed. The control unit adapts the calibration timing based on the operational state of the clutch device, performing multiple calibrations during the first operating time when setting behavior occurs, and switching to longer intervals after this period. This dynamic adjustment ensures accurate torque transmission while optimizing calibration timing.
Solution Approach 2:
The control unit monitors the operational parameters of the clutch device and uses this feedback to determine when calibrations should be performed. By detecting the setting behavior through monitoring torque transmission and operational conditions, the system automatically adjusts calibration frequency, ensuring the kiss point remains accurate without requiring manual intervention or fixed schedules.
2Measurement precision
If multiple calibrations are performed during the first operating time, then the setting behavior is compensated and torque matching improves, but the calibration frequency increases
Solution Approach 1:
The operational life of the clutch device is segmented into distinct phases: a first operating time period where multiple calibrations are performed to address setting behavior, and a second operating time period where calibrations are performed less frequently. This segmentation allows intensive calibration during the critical initial phase while maintaining efficiency during stable operation.
Solution Approach 2:
Calibrations are performed periodically with varying intervals based on the operational phase. During the first operating time, calibrations occur at shorter intervals to capture setting behavior. After this period, the system transitions to longer intervals. This periodic action with adaptive intervals ensures measurement precision while avoiding excessive calibration operations.
3Reliability
If the calibration interval is shortened to account for setting behavior, then torque deviation is reduced, but the calibration process is performed more frequently
Solution Approach 1:
Multiple calibrations are performed in advance during the first operating time period to preemptively address setting behavior before it causes significant torque deviation. By performing these calibrations early and frequently during the initial phase, the system establishes accurate torque transmission characteristics before normal operation begins, reducing the need for frequent calibrations later.
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
This approach ensures a high degree of matching between target and actual torque, reducing deviations to less than 10% during the clutch device's operation, effectively compensating for the setting behavior of clutch plates and maintaining optimal torque transmission.
Implementation Method 1
The clutch device comprises at least a plurality of clutch plates in mutual frictional contact
Data Source
AI summary
A clutch device has at least a multiplicity of clutch discs which are in frictional contact with one another, and a control unit which controls the clutch device. The clutch device is calibrated repeatedly during an operating time of the clutch device. A first calibration is performed at a first point in time. A second calibration is performed at a second point following the first calibration. The first point in time and the second point in time are within a first operating time of the clutch device and occur within a first time interval. At least a third calibration is performed in a subsequent second operating time at a third point in time. At least the second calibration is performed within a second interval of the third point in time. The first and second intervals are determined by the control unit based on a mileage of a vehicle or an energy input into the clutch device. The first interval is shorter than the second interval.