Steer-by-Wire Steering Reaction Force Control
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Solution Overview
Problem
Existing steering control systems for vehicles with steer-by-wire mechanisms face challenges in balancing travel assist control and driver steering operations, as applying a steering reaction force to maintain a target wheel-turning angle can interfere with the driver's steering input.
Innovation Solution
A steering control method that detects the actual steering angle, calculates a target steering angle, and applies a steering reaction force based on the angle deviation, reducing the force when a driver's steering operation is detected to facilitate easier steering while ensuring the wheel-turning angle follows the target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a steering reaction force is applied to maintain the target wheel-turning angle during travel assist control, then the followability of the wheel-turning angle to the target is improved, but the driver's steering operation becomes difficult
Solution Approach 1:
The steering reaction force control is made dynamic by detecting driver steering operations and adjusting the reaction force accordingly. When driver operation is detected, the system reduces or suspends the application of steering reaction force, allowing smooth transition between automatic following control and manual steering control modes
Solution Approach 2:
The system implements feedback control by continuously monitoring the actual steering angle, comparing it with the target steering angle, and applying corrective steering reaction force based on the detected deviation. This feedback mechanism ensures the wheel-turning angle follows the target while allowing driver input to override when necessary
Data Source
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AI summary
A steering control method for a vehicle including a steer-by-wire type wheel-turning mechanism in which a steering wheel and steered wheels are mechanically disconnected, the method including: detecting an actual steering angle of the steering wheel (S1); calculating a target steering angle of the steering wheel on a basis of a target wheel-turning angle of the steered wheels (S2); applying a steering reaction force to the steering wheel according to an angle deviation between the actual steering angle and the target steering angle (S9) ; detecting a steering operation of the steering wheel by a driver (S3) ; and when the steering operation by the driver is detected, reducing the steering reaction force according to the angle deviation compared with when the steering operation by the driver is not detected (S4, S8) .