e-LSD Drift Control Using Outer-Wheel Torque Bias
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Solution Overview
Problem
Existing electronic limited slip differential (e-LSD) systems in rear wheel drive vehicles restrict drift driving by not allowing driving force exceeding the allowable driving force of the driving wheels, thus not properly reflecting the driver's intention for drift driving.
Innovation Solution
A drift driving control method and system for an e-LSD that determines whether drift mode conditions are met based on the driver's vehicle operating state and outputs a driving state, and when met, controls the e-LSD to increase the driving force of the turning outer wheel, causing oversteering and maintaining simultaneous slipping of both wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the e-LSD restricts driving force to within allowable driving force of driving wheels, then vehicle stability during normal turning is improved, but drift driving capability is restricted
Solution Approach 1:
The e-LSD system dynamically adjusts its torque distribution strategy based on detected driving conditions. During normal turning, it maintains stable torque distribution within allowable limits. When drift conditions are detected (through sensor inputs indicating drift intent), it transitions to a dynamic mode that allows driving force to exceed allowable limits, enabling the outer wheel to slip and initiate drift while maintaining simultaneous slipping of both wheels
2Ease of operation
If the e-LSD controls torque distribution to prevent wheel slip, then neutral steering is achieved, but driver's intention for drift driving is not reflected
Solution Approach 1:
The system continuously monitors driving state through sensor inputs and compares them against drift condition thresholds. When drift conditions are detected, the feedback loop switches from preventing wheel slip to maintaining controlled simultaneous slipping of both wheels, allowing the driver's drift intention to be reflected in the vehicle's actual behavior
3Stability of the object's composition
If the e-LSD applies control torque within allowable driving force, then understeering is restricted, but drift driving cannot be properly executed
Solution Approach 1:
The system changes the torque distribution parameters based on detected driving mode. During normal operation, it maintains torque within allowable limits to prevent understeering. When drift mode is detected, it changes the parameters to allow torque to exceed allowable limits, enabling the outer wheel to slip and execute proper drift driving
Data Source
AI summary
A drift driving control method and system of an electronic limited slip differential (e-LSD). The method and the system enable drift driving by controlling an e-LSD differential when drift driving is intended by a driver. Whether or not drift mode conditions are met on the basis of a driver's vehicle operating state and an output value reflecting a driving state of a vehicle is determined. When the drift mode conditions are met, control is performed so that drift driving is performed by causing the vehicle to be oversteered by increasing driving force of a turning outer wheel using the electronic limited slip differential and then maintaining simultaneous slipping of right and left wheels.