T-S Curve Slope Correction for DCT Clutch Slip
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Solution Overview
Problem
In Dual Clutch Transmission (DCT) systems, the T-S curve, representing the relationship between clutch torque and stroke, often deviates due to factors like abrasion, thermal deformation, and mass production deviations, leading to potential slip and gear shifting shocks, as the actual positions at low and high torques differ from the intended positions on the T-S curve.
Innovation Solution
A method to detect and correct the slope of the T-S curve by determining differences between actual and intended positions at low and high torque regions, using reference values to adjust the curve in increasing or decreasing directions, thereby preventing slip and gear shifting shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the T-S curve is used without correction, then the clutch control system is simple, but the accuracy of torque transmission deteriorates due to deviations from actual positions
Solution Approach 1:
The patent implements feedback by detecting the actual position of the clutch during operation and comparing it with the position predicted by the T-S curve. The controller then corrects the T-S curve based on the detected deviation, creating a closed-loop system that continuously improves accuracy. This feedback mechanism resolves the contradiction by maintaining high measurement precision through dynamic correction without requiring complex hardware modifications.
Solution Approach 2:
The patent changes the parameters of the T-S curve dynamically based on detected deviations. By adjusting the curve parameters (such as torque values at specific stroke positions) based on actual clutch behavior, the system adapts to wear, thermal effects, and manufacturing variations. This parameter adjustment approach improves torque transmission accuracy while keeping the correction system relatively simple, as it modifies existing curve data rather than adding complex control mechanisms.
2Measurement precision
If the T-S curve is corrected frequently, then the accuracy of clutch position recognition is improved, but the control response time deteriorates
Solution Approach 1:
The patent performs preliminary correction of the T-S curve during periods when gear shifting is not actively occurring. By preparing corrected curve data in advance during idle or transition periods, the system ensures that accurate T-S data is ready for immediate use when gear shifting requires rapid response. This preliminary action resolves the contradiction by improving position recognition accuracy through correction while minimizing the impact on control response time during critical operations.
3Reliability
If the clutch torque is increased to prevent slip, then the reliability of torque transmission is improved, but the risk of excessive shock deteriorates
Solution Approach 1:
The patent applies dynamic correction to the T-S curve, adjusting torque values based on the actual clutch characteristics detected during operation. This dynamic approach allows the system to optimize the engagement torque profile in real-time, ensuring sufficient torque to prevent slip while avoiding excessive shock. The dynamic adjustment resolves the contradiction by adapting the torque transmission characteristics to match actual clutch behavior, maintaining reliability without causing harmful shocks.
Data Source
AI summary
A T-S curve correction method for a clutch system may include: detecting differences between actual positions of a clutch in first and second torque regions and a position on a T-S curve; determining whether the difference between the actual position in the first torque region and the position on the T-S curve is equal to or more than a first reference value; determining whether the difference between the actual position in the second torque region and the position on the T-S curve is equal to or less than a third reference value, when the difference of the actual position in the first torque region is equal to or more than the first reference value; and correcting the slope of the T-S curve in the increasing direction, when the difference of the actual position in the second torque region is equal to or less than the third reference value.