Vehicle Clutch Control Torque Prediction for Slippage Prevention
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Solution Overview
Problem
Excessive slippage of a dry clutch during sudden acceleration in vehicles leads to jolting, delayed acceleration, and reduced fuel efficiency due to inaccuracy in torque transmission characteristics and inadequate response speed of the clutch controller.
Innovation Solution
A clutch control method that estimates changes in input torque based on acceleration pedal depression, calculates additional torque to prevent slippage, and adjusts clutch control torque by operating the clutch actuator to maintain optimal power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the clutch is fully engaged to transmit power, then power transmission efficiency is improved, but the clutch cannot respond fast enough to sudden torque changes causing excessive slippage
Solution Approach 1:
The controller predicts future input torque based on current acceleration pedal position and its rate of change, then proactively adjusts clutch transmission torque before the actual torque change occurs. This preliminary action allows the clutch to maintain optimal engagement without excessive slippage when sudden torque demands arise, resolving the contradiction between maintaining full engagement for efficiency and responding quickly to torque changes.
2Reliability
If the clutch transmission torque is reduced to prevent slippage, then drivability is improved, but power transmission efficiency deteriorates
Solution Approach 1:
The clutch transmission torque is dynamically adjusted based on predicted input torque and current slip conditions. The controller continuously modifies the clutch engagement state to maintain optimal torque transmission, preventing both excessive slippage and complete disengagement. This dynamic control ensures drivability is maintained while minimizing energy loss through slippage.
Solution Approach 2:
The controller uses feedback from acceleration pedal position, its rate of change, and actual clutch slip conditions to continuously adjust clutch transmission torque. This closed-loop control ensures that the clutch responds appropriately to driver inputs while maintaining optimal power transmission efficiency, resolving the contradiction between drivability and energy efficiency.
3Measurement precision
If the T-S curve accuracy is improved, then clutch control precision is improved, but the complexity of the control system increases
Solution Approach 1:
Instead of relying on a complex accurate T-S curve, the system changes the control parameters to use acceleration pedal position and its rate of change as direct inputs for torque prediction. This simplifies the control system by using readily available sensor data and mathematical differentiation rather than complex lookup tables or curves, while still achieving precise clutch control.
Data Source
AI summary
A clutch control method of a vehicle may include estimating a change in an input torque supplied by a power source based on an extent to which an acceleration pedal is depressed by the controller; obtaining an additional torque at a level to prevent slippage of a clutch against the input torque estimated in the estimating of a change in input torque by the controller; determining a final clutch control torque for controlling the clutch by adding the additional torque, which is obtained in the obtaining of an additional torque, to the input torque by the controller; and controlling the clutch by operating a clutch actuator with the final clutch control torque determined in the determining of a final clutch control torque by the controller.