Steer-By-Wire Torque Feedback for Weight Transfer Steering Feel
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Solution Overview
Problem
Steer-by-wire steering systems lack mechanical connection between the steering wheel and wheels, leading to a lack of feedback torque during weight transfer, resulting in a noticeable difference in driving feel compared to electric power steering systems.
Innovation Solution
A method to control steer-by-wire steering systems by calculating feedback torque based on longitudinal and lateral accelerations, using sensors to modify the base steering torque and provide feedback to the steering wheel, mimicking the feel of electric assisted power steering systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If steer-by-wire steering system is used to eliminate mechanical connection, then steering system reliability and safety are improved, but steering feel and driver feedback are worsened
Solution Approach 1:
The patent implements a feedback actuator that provides artificial feedback torque to the steering wheel based on measured vehicle states (lateral acceleration, longitudinal acceleration, steering angle). This feedback mechanism compensates for the lost mechanical connection, creating a simulated steering feel that maintains driver awareness and control while preserving the safety benefits of steer-by-wire architecture
Solution Approach 2:
The feedback actuator serves as an intermediary between the road wheel actuator and the steering wheel. It translates the actual road wheel torque and vehicle dynamics into an artificial feedback signal that mimics the mechanical connection feel, allowing the driver to perceive steering information without a direct mechanical link
2Device complexity
If feedback torque is provided only through road wheel actuator, then system complexity is reduced, but steering feel accuracy during acceleration and braking is worsened
Solution Approach 1:
The system uses multiple sensors (lateral acceleration sensor, longitudinal acceleration sensor, steering angle sensor) to measure vehicle states and feeds this information back through the feedback actuator. This multi-parameter feedback approach accurately captures weight transfer effects during acceleration and braking, providing precise steering feel compensation without requiring complex mechanical modifications
Solution Approach 2:
The feedback actuator performs multiple functions: it provides artificial feedback torque to simulate weight transfer effects, compensates for the lack of mechanical connection, and adapts to different driving conditions (acceleration, braking, cornering). This single component handles various steering feel requirements across different vehicle operations
Data Source
AI summary
A method to control a steer-by-wire steering system of a road vehicle including a road wheel actuator to turn steerable road wheels and a steering wheel actuator to apply a feedback torque to a steering wheel, includes calculating the feedback torque by modifying a base steering torque as a function of a longitudinal and/or lateral acceleration measured by sensors of the vehicle, and sending the calculated feedback torque to the steering wheel actuator to provide feedback to the driver at the steering wheel.