EV Drift Control Using Countersteer Expansion and Wheel Force Modulation
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Solution Overview
Problem
Existing electric vehicle drift modes struggle with controlling the amplitude of rear wheel slip, as torque response is fast and wide, making it difficult to maintain a desired drift state without impairing ease of control, and mechanical solutions like steering angle adapters affect suspension stability.
Innovation Solution
A software-based driving control system that adjusts driving force and braking force applied to wheels based on driver intent, using a countersteer index to enhance the countersteer effect during drift mode, without hardware modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If torque response is made fast and wide for electric vehicle drift mode, then rear wheel slip can be generated easily, but it becomes difficult to control the amplitude of rear wheel slip to the desired extent
Solution Approach 1:
The control unit dynamically adjusts multiple parameters including driving force magnitude, braking force magnitude, and braking force application timing based on the drift state. By changing these parameters in real-time, the system maintains fast torque response while enabling precise control of rear wheel slip amplitude through coordinated motor and brake control.
2Ease of operation
If steering angle is expanded by attaching steering angle adapter between steering knuckle and tie rod, then countersteer effect is increased, but suspension stability and overall balance of vehicle are affected
Solution Approach 1:
The patent replaces the mechanical steering angle adapter with a software-based control system. The control unit calculates required braking forces and coordinates brake application with motor torque control to achieve countersteer expansion effect without any physical modification to the steering mechanism, thereby preserving suspension stability and vehicle balance.
Solution Approach 2:
The control unit acts as an intermediary between driver steering input and vehicle response. It processes steering angle information and generates coordinated motor and brake control commands that produce the desired countersteer effect, mediating the interaction without requiring mechanical modifications to the steering system.
3Productivity
If driving force is generated regardless of driver's intention for drift mode, then rear wheel slip occurs readily, but ease of drift control is impaired
Solution Approach 1:
The control unit continuously monitors drift state information including rear wheel slip conditions and driver steering inputs. Based on this feedback, it dynamically adjusts the magnitude of driving force and braking force, and determines optimal braking application timing. This closed-loop control ensures rear wheel slip is generated efficiently while maintaining ease of drift control by responding to actual vehicle state and driver intent.
Data Source
AI summary
A driving control system and method for electric vehicles that may expand the countersteer effect through a software method of controlling driving force or braking force applied to wheels of a vehicle depending on a driver's intention and needs, can include a control unit that performs countersteer expansion control to increase the countersteer effect with respect to a driver's countersteer amount, determine whether or not a driving state of the vehicle is a countersteer situation based on vehicle driving information including information detected by a driving information detector, determine a countersteer index, and perform the countersteer expansion control configured to control driving force or braking force applied to wheels to increase the countersteer effect, when the determined countersteer index satisfies an expansion requirement after determining that the current driving state of the vehicle is the countersteer situation.