Limited Slip Differential Control Using Real-Time Wheel Load
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Solution Overview
Problem
Existing wheel slip control methods, such as ABS and TCS, are limited by control cycle delays and ineffective processing of wheel speed signals, leading to inadequate slip control performance, especially when considering real-time changes in tire vertical load and roll motion during vehicle turning, which can result in excessive side slip.
Innovation Solution
An apparatus and method that pre-reflects real-time tire vertical load information to control the limited slip differential, determining a torque command and threshold engagement torque based on vehicle operation information to prevent excessive side slip by engaging the differential when the torque command exceeds the threshold, thereby stabilizing tire grip during turning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ABS and TCS control methods are used, then basic wheel slip control is provided, but control cycle delays and processing issues result in inadequate slip control performance
Solution Approach 1:
The system performs preliminary action by predicting tire vertical load changes based on vehicle roll motion and lateral acceleration before wheel slip actually occurs. This allows the limited slip differential to be engaged proactively in anticipation of slip conditions, rather than reacting after slip has occurred, thereby eliminating control cycle delays and improving slip control performance.
2Reliability
If feedback control is used without pre-reflecting roll motion and tire vertical load information, then control simplicity is maintained, but wheel slip control performance is limited and excessive side slip occurs
Solution Approach 1:
The system calculates predicted tire vertical load by incorporating vehicle roll motion and lateral acceleration information in advance. This preliminary calculation provides forward-looking data that enables proactive engagement of the limited slip differential before wheel slip occurs, significantly improving control performance without requiring complex real-time feedback mechanisms.
Solution Approach 2:
The system introduces predicted tire vertical load as an intermediary parameter that mediates between vehicle dynamics (roll motion, lateral acceleration) and differential engagement control. This intermediary provides a simplified yet effective control signal that improves slip prevention performance without the complexity of direct real-time feedback from multiple sensors.
3Reliability
If the limited slip differential is engaged based on real-time torque commands without considering vertical load changes, then response speed is fast, but excessive side slip occurs during turning
Solution Approach 1:
The system performs preliminary calculation of predicted tire vertical load using vehicle roll motion and lateral acceleration data before the actual wheel slip occurs during turning. This allows the limited slip differential to be engaged at the optimal time in advance, combining fast response with improved tire grip stability by anticipating vertical load changes that precede slip conditions.
Data Source
AI summary
A method of controlling wheel slip of a vehicle and an apparatus thereof, the method includes determining, by a controller, a torque command for a driving device configured to drive the vehicle based on vehicle operation information obtained by an operation information detector while the vehicle is traveling, obtaining, by the controller, real-time vertical load information of a left wheel and a right wheel of the vehicle while the vehicle is traveling based on the vehicle operation information collected in the vehicle, determining, by the controller, a threshold engagement torque for control of a limited slip differential from the obtained real-time vertical load information, comparing, by the controller, a real-time torque command determined in real time based on the vehicle operation information, with the determined threshold engagement torque, and controlling, by the controller, the limited slip differential to be engaged so that differential action of a differential is limited when the real-time torque command exceeds the threshold engagement torque.