Vehicle Torque Control System for Smooth Slip Elimination
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Solution Overview
Problem
Existing vehicle driving force control systems face challenges in eliminating wheel slippage without abruptly changing driving or braking torque, leading to uncomfortable feelings for the driver and potential resonance in driveshafts.
Innovation Solution
A driving force control system with a torque generating device, differential mechanism, and differential restricting device, controlled by a system that calculates slip ratios and adjusts torque distribution between wheels to eliminate slippage without abrupt changes in torque, using a controller that executes slip-eliminating control by restricting differential rotation and adjusting driving or braking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission torque of the clutch device is increased to eliminate wheel slippage, then the wheel slippage is reduced, but the driving torque changes abruptly causing driver discomfort and potential resonance
Solution Approach 1:
The control system dynamically adjusts the clutch transmission torque based on real-time wheel slip detection. When slippage is detected, the clutch torque is increased progressively to eliminate slippage, and when slippage stops, the torque is reduced gradually. This dynamic adjustment prevents abrupt torque changes that would cause driver discomfort while effectively eliminating wheel slippage.
Solution Approach 2:
The system uses wheel speed sensors to continuously monitor wheel rotation speeds and calculate slip ratios. This feedback information is fed to the control unit which adjusts the clutch transmission torque accordingly. The closed-loop control ensures that torque adjustments are made only when necessary and are modulated to avoid abrupt changes, resolving the contradiction between slippage elimination and driver comfort.
2Reliability
If the transmission torque of the clutch device is increased to eliminate slippage, then the wheel slippage is reduced, but torque distribution between wheels becomes imbalanced
Solution Approach 1:
The control system applies different torque control strategies to different wheels based on their individual slip conditions. When one wheel slips more than the other, the system selectively increases torque to the slipping wheel through differential clutch control, rather than uniformly increasing torque to both wheels. This localized torque adjustment eliminates slippage while maintaining balanced torque distribution across the wheel pair.
Data Source
AI summary
A driving force control system for a vehicle configured to eliminate slippage of a wheel without changing a driving torque or a braking torque abruptly. The driving force control system comprises a drive unit and a controller. The drive unit includes a differential mechanism connected to a right wheel and a left wheel to distribute torque of a torque generating device, and a differential restricting device that restricts a differential rotation between the right wheel and the left wheel. The controller restricts a differential rotation between the right wheel and the left wheel less than a predetermined value by the differential mechanism. If a slip ratio of one of the wheels smaller than that of the other wheels is greater than an acceptable value, the controller executes a slip-eliminating control.