Clutch Slip Identification via Angular Rotation Difference
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Solution Overview
Problem
Current dual clutch transmission systems face challenges in accurately detecting clutch slippage and efficiently controlling clutch pressure, leading to torque losses and reduced shifting performance.
Innovation Solution
A control system that determines clutch slippage by calculating the difference in angular rotations between the transmission input and output shafts, adjusted for the gear ratio, and adjusts clutch pressure using sensors and a fluid pump to maintain optimal engagement and reduce slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clutch pressure is increased to prevent slippage, then clutch engagement reliability is improved, but torque losses increase due to excessive friction and heat
Solution Approach 1:
The clutch pressure is made dynamically adjustable rather than fixed. The system continuously monitors shaft rotations and clutch slip conditions, then adjusts pressure in real-time to match actual operating conditions. This dynamic adjustment prevents both slippage and excessive friction losses.
Solution Approach 2:
The system implements feedback control by monitoring the difference between expected and actual output shaft rotations, detecting clutch slip conditions, and using this information to adjust clutch pressure. This closed-loop control ensures optimal pressure application only when needed.
2Loss of energy
If clutch pressure is decreased to reduce torque losses, then energy efficiency is improved, but clutch slippage increases leading to poor engagement
Solution Approach 1:
The system transitions from static clutch pressure to dynamic pressure control that adapts to real-time conditions. Pressure is reduced when slip is detected to minimize energy loss, while maintaining sufficient engagement when needed for reliable operation.
Solution Approach 2:
Feedback from rotation sensors and slip detection algorithms enables the system to respond to actual clutch conditions. When slip is detected, the system increases pressure to prevent slippage; when engaged properly, pressure is reduced to minimize losses.
3Productivity
If clutch slip detection is made more sensitive to detect early slippage, then shifting performance is improved, but false detections increase leading to unnecessary pressure adjustments
Solution Approach 1:
The system uses a threshold-based detection approach that monitors rotation differences but only triggers pressure adjustment when the difference exceeds a predetermined threshold. This partial action approach avoids over-reacting to minor variations while still detecting genuine slip conditions.
Solution Approach 2:
The feedback mechanism compares actual output shaft rotation against expected rotation based on input shaft rotation and gear ratio. Only when a significant discrepancy persists does the system conclude true slippage has occurred, filtering out transient variations.
Data Source
AI summary
A control system for a transmission of a vehicle includes a first angular rotation module, a second angular rotation module, and a slip module. The first angular rotation module determines a first angular rotation of a first component of the transmission during a predetermined period based on a first signal generated by a first sensor. The second angular rotation module determines a second angular rotation of a second component of the vehicle during the predetermined period based on a second signal generated by a second sensor. The slip module selectively indicates that a clutch of the transmission is slipping based on the first angular rotation and the second angular rotation.