Adaptive Jerk Limiting Clutch Control Filter
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Solution Overview
Problem
Existing clutch control methods for vehicles with dry clutches often result in shocks due to sudden changes in clutch torque during launching and shifting, as they fail to properly follow the launching target torque, leading to vibrations and poor drivability.
Innovation Solution
A clutch control method that filters the clutch target torque to limit jerk, determining whether jerk needs to be limited based on torque variations, and adjusts the torque variation accordingly to ensure smooth clutch control torque changes, thereby preventing sudden changes in clutch torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the clutch control torque is filtered to limit jerk, then the clutch torque changes smoothly, but the clutch control torque does not properly follow the launching target torque, causing shocks
Solution Approach 1:
The patent applies dynamics by making the jerk limit adaptive rather than fixed. The controller dynamically adjusts the jerk limit based on the difference between the current clutch control torque and the launching target torque. When the difference is large, a larger jerk limit is applied to enable faster response; when the difference is small, a smaller jerk limit is applied to ensure smooth tracking, thus resolving the contradiction between smoothness and tracking accuracy
Solution Approach 2:
The patent changes the parameter of jerk limit from a constant value to a variable value that depends on the torque difference. By adjusting the jerk limit parameter dynamically, the system achieves both smooth torque changes and accurate tracking of the launching target torque, resolving the technical contradiction
2Speed
If the clutch control torque is not filtered, then it follows the launching target torque quickly, but sudden changes in clutch torque cause shocks
Solution Approach 1:
The patent makes the filtering characteristic dynamic by adjusting the jerk limit based on operating conditions. When rapid response is needed, the controller allows larger jerk; when smooth operation is needed, the controller limits jerk more strictly. This dynamic approach resolves the contradiction between response speed and shock prevention
Solution Approach 2:
The patent uses feedback by continuously monitoring the difference between the clutch control torque and the launching target torque, then using this information to adjust the jerk limit. This closed-loop control ensures both fast response and shock prevention by adapting the filtering strength to current operating conditions
Data Source
AI summary
The present disclosure provides a clutch control method, including: a variation setting step of setting, by a controller, a current torque variation depending on a difference between a just previous clutch control torque and a clutch target torque; a limit determining step of determining whether a jerk of a clutch control torque need not be limited when the clutch control torque is reduced and then is increased or when the clutch control torque is continuously reduced by using the current torque variation and a just previous torque variation; a direction setting step and a limit setting step to determine a final torque variation based on the outcome of the limit determining step; and a control torque calculating step of calculating the clutch control torque to control a clutch.