Steering Torque Correction for Variable-Grip Steering Wheels
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Solution Overview
Problem
Current power steering systems, particularly motor-driven power steering (MDPS), fail to provide consistent steering torque due to variations in the linear distance from the rotation axis of the steering wheel, leading to irregular steering feelings for drivers when the steering wheel shape is non-circular or when the grip position changes.
Innovation Solution
A steering control device and method that includes a pressure sensor to detect pressure applied to the steering wheel, determining the grip position, calculating a steering torque correction coefficient based on the linear distance from the rotation axis, and adjusting the motor output to correct the steering torque, thereby enhancing the driver's steering experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering wheel shape is non-circular or grip position changes, then the linear distance from the rotation axis varies, but this causes irregular steering feeling due to non-uniform steering torque
Solution Approach 1:
The system dynamically changes the steering torque parameter based on the detected grip position and linear distance from the rotation axis. The controller calculates a corrected steering torque that compensates for variations in linear distance, ensuring uniform steering assistance regardless of steering wheel shape or grip position.
Solution Approach 2:
The system uses pressure sensors to detect grip position and provides feedback to the controller, which then adjusts the motor output torque accordingly. This closed-loop feedback mechanism ensures that steering torque remains uniform despite changes in grip position or steering wheel geometry.
2Reliability
If the linear distance from the rotation axis varies with grip position, then steering torque becomes non-uniform, but adding pressure sensors and correction calculations increases device complexity
Solution Approach 1:
The pressure sensors serve multiple functions: detecting grip position, determining linear distance from the rotation axis, and providing input for torque correction calculations. This multi-functionality reduces the need for additional sensors while achieving steering torque uniformity.
Solution Approach 2:
The system uses the existing pressure sensor data from the steering wheel to automatically calculate and correct steering torque without requiring external intervention or additional complex measurement systems. The controller self-adjusts the motor output based on detected grip conditions.
Data Source
AI summary
According to the disclosure, the steering control device and method may enhance the driver's steering feeling by correcting the steering torque due to a difference in linear distance despite a difference in the linear distance from the rotation axis according to the position of the pressure applied to the steering wheel shaped so that the linear distance from the rotation axis increases/decreases.