Torque Vectoring Drift Control for AWD Durability and Stability
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Solution Overview
Problem
Existing AWD vehicles with LSD systems face durability issues due to excessive thermal load during drift driving, limiting their ability to assist in drift entry and maintenance, and consumers must choose between vehicles that allow drifting but compromise stability, or those that prioritize stability over drifting.
Innovation Solution
A control method using a torque vectoring motor to distribute torque between front and rear wheels based on vehicle state information, enhancing drift entry and maintenance by controlling yaw rate and synchronizing wheel speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If AWD system with LSD is used to maintain drift, then drift capability is improved, but thermal load on brake elements and clutch elements increases excessively causing durability issues
Solution Approach 1:
The patent replaces the mechanical LSD system with an electric torque vectoring system that uses independent motor control of rear wheels to achieve drift. This substitution eliminates the need for mechanical locking mechanisms and brake-based slip control, thereby reducing thermal load on brake and clutch elements while maintaining drift capability.
Solution Approach 2:
The patent changes the control parameters by independently controlling the torque applied to each rear wheel through motor control. By adjusting motor torque independently rather than using mechanical locking, the system maintains drift capability without excessive thermal generation from friction-based mechanisms.
2Stability of the object's composition
If AWD system is used to improve vehicle straightness and stability, then driving stability is improved, but slip angle of rear wheels is reduced making drift driving difficult
Solution Approach 1:
The patent applies local quality by independently controlling the torque of each rear wheel through separate motor control. This allows the system to maintain overall vehicle stability while creating localized rear wheel slip conditions necessary for drift by applying different torque levels to inner and outer rear wheels during turning.
Solution Approach 2:
The patent implements dynamic control by continuously adjusting motor torque based on real-time vehicle state (yaw rate, steering angle, wheel speed) to transition between stable driving and drift conditions. The system dynamically modulates rear wheel torque to induce controlled slip while maintaining front wheel grip for stability.
3Adaptability or versatility
If LSD locks axle to suppress inner wheel slip during drift, then drift maintenance is improved, but thermal load on clutch elements increases causing durability deterioration
Solution Approach 1:
The patent replaces the mechanical LSD clutch-based torque distribution system with an electric motor-based torque vectoring system. This substitution eliminates clutch slippage and associated thermal generation while maintaining the ability to suppress inner wheel slip and sustain drift through independent rear wheel torque control.
Data Source
AI summary
A control method for drift driving a vehicle supports a drift entry assistance function and a drift maintenance assistance function while maximizing driver's drift driving experience. The control method includes determining, by a controller, whether or not drift entry assistance control is required based on vehicle driving state information, when the vehicle enters a drift mode, and performing, by the controller, the drift entry assistance control using a torque vectoring motor so that the vehicle reaches a drift driving state when determining that the drift entry assistance control is required.