Friction Clutch Run-In Phase Evaluation Suspension
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Solution Overview
Problem
Friction clutches that have not yet been run in can lead to misdiagnosis as damaged or worn, resulting in premature replacement, due to low friction coefficients and increased slip during normal torque application, especially in dual clutch gearboxes.
Innovation Solution
A method to control friction clutches by suspending evaluation during a predefined run-in phase, using total energy input and temperature-weighted frictional power to determine when the clutch has reached a threshold, thereby preventing misdiagnosis and reducing thermal loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction clutch evaluation is performed continuously, then damaged clutches can be detected reliably, but run-in phase clutches are misdiagnosed as damaged
Solution Approach 1:
The system performs preliminary identification of the run-in phase before conducting damage evaluation. By detecting whether the clutch is in the run-in phase first, the system prevents misdiagnosis during this period while maintaining reliable damage detection afterward. This preliminary action resolves the contradiction by separating the evaluation process into two stages: run-in phase identification followed by conditional damage evaluation.
2Measurement precision
If friction clutch evaluation is suspended during run-in phase, then misdiagnosis is avoided, but damage detection is delayed
Solution Approach 1:
The evaluation system dynamically adjusts its operation based on the detected phase. During the run-in phase, evaluation is suspended to ensure accuracy; once the run-in phase ends, evaluation automatically resumes. This dynamic adaptation resolves the contradiction by making the evaluation timing flexible rather than fixed, ensuring both accuracy during run-in and timely detection afterward.
3Object-affected harmful factors
If torque is limited during run-in phase, then thermal damage is prevented, but productivity is reduced
Solution Approach 1:
The system applies preliminary protective action by limiting torque specifically during the run-in phase when the clutch is most vulnerable to thermal damage. Once the run-in phase concludes and the clutch reaches its operational friction coefficient, the torque limitation is removed. This preliminary protection resolves the contradiction by applying restrictions only when necessary, preventing thermal damage while minimizing impact on overall productivity.
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 method ensures accurate evaluation of friction clutch functionality, preventing unnecessary replacements and reducing the risk of over-revving and thermal damage by delaying evaluation until the clutch has completed its run-in phase.
Implementation Method 1
a friction coefficient between friction linings of a clutch disk and the counterpart friction surfaces of the friction clutch is determined
Implementation Method 2
the frictional power input into the friction clutch is integrated with respect to time, such that the sum of the total energy input into the clutch is used to determine whether the run-in phase of the friction clutch is ended
Data Source
AI summary
A method for controlling a friction clutch operatively arranged between a drive unit and a gearbox. The method includes the steps of detecting torque transmitted by the friction clutch, determining a coefficient of friction between friction linings of a clutch disk and antifriction surfaces of the friction clutch, and evaluating the functional capability based on the determined coefficient of friction. In order to avoid an evaluation of a friction clutch that has not yet been broken-in as a worn friction clutch, the evaluation is postponed during a specified breaking-in phase of the friction clutch.