AMT Clutch Control Micro-Slip Learning Durability
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Solution Overview
Problem
Automated manual transmission (AMT) systems face challenges in controlling clutch micro-slip and full-lock due to the lack of damping, leading to potential hardware deterioration and inefficiencies in torque transmission, which conventional methods fail to address effectively.
Innovation Solution
A method for controlling the clutch in AMT vehicles that includes micro-slip control to learn transmission torque characteristics, followed by full-lock control when specific conditions are met, and resuming micro-slip control based on driving conditions, thereby reducing clutch load and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micro-slip control is continuously performed to learn clutch transmission torque characteristics, then the clutch transmission torque characteristics can be accurately learned, but the clutch durability deteriorates due to constant load on diaphragm spring and release bearing
Solution Approach 1:
The patent implements periodic micro-slip control only when the vehicle is stationary (not moving), rather than continuously during all operations. This periodic execution allows the clutch characteristics to be learned at appropriate intervals without subjecting the clutch to constant micro-slip loads that would deteriorate durability. The controller determines whether to perform micro-slip control based on vehicle motion state, creating a periodic rather than continuous action pattern.
2Measurement precision
If micro-slip control is performed during vehicle movement to learn clutch characteristics, then the clutch transmission torque characteristics can be updated in real-time, but the shifting control time increases due to extended micro-slip control duration
Solution Approach 1:
The patent performs micro-slip control in advance when the vehicle is stationary, before actual shifting operations occur. By learning and updating the clutch transmission torque characteristics during stationary periods, the system prepares the clutch characteristics data beforehand, so that during subsequent shifting operations, the control can proceed more quickly without needing extended micro-slip control time.
3Speed
If full-lock control is performed immediately after micro-slip control, then the clutch engagement speed increases, but the clutch may experience excessive wear due to abrupt torque changes
Solution Approach 1:
The patent implements a gradual transition from micro-slip control to full-lock control, rather than an abrupt switch. During the transition, the controller gradually increases the clutch engagement speed and torque transmission, cushioning the abrupt changes that would otherwise cause excessive wear. This gradual cushioning approach protects the clutch from harmful shock loads while still achieving relatively fast engagement.
Data Source
AI summary
The present disclosure relates to a technique for improving durability of a clutch and shifting stability. The present disclosure provides a method of controlling a clutch of an automated manual transmission (AMT) vehicle, which reduces a micro-slip control time in order to improve durability of the clutch by performing a full-lock control of the clutch after slip control for learning a clutch characteristic curve. Additionally, the method shortens time to open the clutch for a subsequent shifting by predicting the time when a shift restarts after the full-lock control and by resuming the micro-slip control.