Clutch Control Apparatus for Judder Mitigation
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Solution Overview
Problem
The dry clutch in dual clutch transmissions experiences significant temperature variations and manufacturing dispersion, leading to judder phenomena during vehicle acceleration, which causes vibrations and deteriorates drivability due to unstable transmission torque characteristics.
Innovation Solution
A clutch control apparatus that includes a judder extractor, an anti-judder signal generator, and a signal post-processing device to actively control the clutch by generating and applying an anti-judder torque, which is a reverse phase signal adjusted in amplitude and phase to counteract the judder, thereby reducing vehicle vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a dry clutch is used to improve power transmission efficiency and fuel economy, then transmission efficiency is improved, but temperature variation and judder phenomenon occur due to friction
Solution Approach 1:
The control apparatus generates an anti-judder torque signal that is the reverse phase of the detected judder component, applying counteracting torque before the judder fully manifests to reduce vibration and improve drivability while maintaining dry clutch operation
2Power
If clutch friction material is used to transmit power, then power transmission is achieved, but friction performance instability causes transmission torque variation
Solution Approach 1:
The system continuously detects the judder component from transmission input shaft speed and feeds back a corrected anti-judder torque signal to the clutch actuator, creating a closed-loop control system that compensates for friction performance instability in real-time
Solution Approach 2:
The control apparatus dynamically adjusts the clutch torque by modifying the actuator control signal based on detected judder characteristics, changing operational parameters to maintain stable power transmission despite friction material variability
3Ease of manufacture
If clutch manufacturing dispersion is present, then manufacturing ease is improved, but transmission torque characteristics vary considerably
Solution Approach 1:
The control system automatically compensates for manufacturing variations by detecting actual judder characteristics and self-adjusting the clutch torque through the anti-judder control algorithm, eliminating the need for precise manual calibration of each clutch unit
Data Source
AI summary
A clutch control apparatus includes: a judder extractor for extracting a judder component based on a speed of a transmission input shaft; an anti-judder signal generator for generating a basic control signal, which is a reverse phase signal to the judder component, based on the judder component extracted by the judder extractor; a signal separator for separating an amplitude and a phase of the basic control signal received from the anti-judder signal generator; and a signal post-processing device for respectively adjusting the amplitude and the phase output from the signal separator and then combining the same together to output anti-judder torque.