Clutch Torque-Stroke Curve Correction for Temperature Gradients
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Solution Overview
Problem
Dry clutches in semi-automatic transmissions experience significant variations in transmission torque due to temperature differences between the surface and core, leading to improper clutch control, excessive slipping, or impact, as existing control methods assume uniform clutch temperature.
Innovation Solution
A method to correct the torque-stroke curve by determining if the temperature difference between the surface and core exceeds a reference value, and adjusting the curve accordingly to account for these differences, thereby improving clutch control and preventing impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the clutch control system uses a single representative temperature value to select the T-S curve, then the control system is simple and easy to operate, but the transmission torque control becomes inaccurate when there is significant temperature difference between surface and core
Solution Approach 1:
The patent divides the clutch temperature field into multiple regions (surface temperature and core temperature) rather than using a single representative value. This segmentation allows the control system to account for temperature gradients within the clutch, improving torque control accuracy while maintaining reasonable system complexity through structured temperature monitoring and multi-curve selection.
Solution Approach 2:
The patent changes the temperature parameter from a single uniform value to multiple spatially-distributed temperature values (surface and core). By introducing this parameter change, the system can select appropriate T-S curves based on actual thermal conditions, resolving the contradiction between control simplicity and torque accuracy under varying temperature conditions.
2Productivity
If the actuator stroke is determined based on a T-S curve selected from a single representative temperature, then the control process is fast and efficient, but excessive slipping or impact occurs when temperature distribution is non-uniform
Solution Approach 1:
The patent performs preliminary temperature measurement and T-S curve selection before actuator stroke determination. By pre-establishing multiple T-S curves corresponding to different temperature conditions and selecting the appropriate curve in advance, the system maintains fast control response while avoiding the reliability issues caused by temperature-induced torque variations.
Solution Approach 2:
The patent implements feedback through continuous temperature monitoring (surface and core) and dynamic T-S curve selection. This feedback mechanism ensures the control system adapts to actual thermal conditions, preventing excessive slipping or impact while maintaining efficient control response through real-time adjustments.
3Device complexity
If the T-S curve is not corrected for temperature differences, then the clutch control system remains simple, but the clutch endurance decreases due to excessive slipping and impact
Solution Approach 1:
The patent introduces dynamic T-S curve correction based on real-time temperature measurements. The control system dynamically adjusts the T-S curve selection according to actual thermal conditions (surface and core temperatures), which protects the clutch from excessive slipping and impact, thereby extending endurance while maintaining acceptable system complexity through structured correction algorithms.
Data Source
AI summary
A method of correcting clutch characteristics of a vehicle may include determining whether or not a difference in temperature between a surface and a core of a driving clutch exceeds a reference value, and correcting a torque-stroke (T-S) curve if it is determined that the difference in temperature exceeds the reference value. The correcting of the T-S curve may include moving the T-S curve from a currently selected position in a direction in response to a rise in temperature.