Clutch Touch Point Detection via Drag Torque Correction
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Solution Overview
Problem
Existing methods for detecting the touch point of a clutch in automated manual transmissions and double clutch transmissions are prone to mis-detection due to variations in angular acceleration of the input shaft, affecting stable operability and control.
Innovation Solution
A method and apparatus that utilize an engine speed sensor to calculate drag torque and correct the detection range of the touch point by adjusting the setting values based on the speed and acceleration of the input shaft, updating the touch point as a clutch position matched to a reference value, and releasing the clutch when the speed exceeds a certain value, thereby improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the touch point is detected based on angular acceleration of the input shaft, then the detection method is simple, but the detection accuracy deteriorates due to variations in angular acceleration
Solution Approach 1:
The patent changes the detection parameter from angular acceleration to drag torque, which is calculated based on the relationship between engine torque and clutch engagement characteristics. This parameter change eliminates the mis-detection problem caused by angular acceleration variations while maintaining detection simplicity
Solution Approach 2:
The patent introduces drag torque as an intermediary parameter that mediates between the engine torque and clutch engagement state. By using drag torque instead of directly measuring angular acceleration, the system achieves more accurate touch point detection that is not affected by acceleration variations
2Device complexity
If the touch point detection range is fixed, then the control system is simple, but the detection reliability deteriorates when clutch characteristics change due to temperature or abrasion
Solution Approach 1:
The patent makes the touch point detection range dynamic by adjusting it based on the calculated drag torque. The detection range is no longer fixed but adapts to changing clutch conditions, ensuring reliable detection even when clutch characteristics change due to temperature or abrasion
Solution Approach 2:
The patent implements feedback by continuously monitoring the drag torque and adjusting the detection range accordingly. The system uses the calculated drag torque value to dynamically modify the detection parameters, creating a closed-loop control that maintains detection reliability under varying conditions
Data Source
AI summary
Disclosed are a method and an apparatus for detecting a touch point of a clutch and the method includes: maintaining a touch point of the clutch; correcting a setting value for determining a lowest value by calculating drag torque using a speed and an acceleration of a input shaft to change a detection range of the touch point; setting the lowest value of the speed of the input shaft within the changed detection range of the touch point to a reference value of the input shaft after actuating the clutch; releasing the clutch when the speed of the input shaft is more than a value acquired by adding the reference value of the input shaft and the corrected setting value for determining the lowest value; and updating the touch point as a clutch position matched to the reference value.