Steer-by-Wire Backup Steering Through Wheel Speed Control
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Solution Overview
Problem
The steer-by-wire system lacks a backup steering function after software failure, posing safety risks, and existing backup systems with electronic clutches have complex structures and high costs, making them unsuitable for intelligent vehicles.
Innovation Solution
A backup steering system adjusts wheel speed based on desired steering angles and vehicle dynamics to ensure steering control when the main system fails, using a method that calculates wheel speeds through steering parameters and real-time vehicle data without additional mechanical structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electronic clutch apparatus is mounted as a backup steering system, then steering control is ensured when the main system fails, but the structure becomes complex and cost increases
Solution Approach 1:
The patent replaces the traditional mechanical backup steering system (electronic clutch apparatus) with an electromagnetic-based solution. The electromagnetic actuator uses electromagnetic fields to directly adjust wheel speeds, eliminating the need for mechanical clutch components and reducing structural complexity while maintaining steering control reliability during main system failures.
Solution Approach 2:
The patent changes the control parameter from mechanical engagement/disengagement to electromagnetic field intensity adjustment. By controlling the electromagnetic actuator's coil current, the system can continuously adjust wheel speed differentials to achieve steering control, providing smoother operation and reducing mechanical wear compared to clutch-based systems.
2Reliability
If an electronic clutch apparatus is mounted as a backup steering system, then steering control is ensured when the main system fails, but the cost increases
Solution Approach 1:
The patent replaces expensive mechanical clutch components with more affordable electromagnetic actuators. The electromagnetic solution requires fewer precision-machined parts, less complex assembly procedures, and can be manufactured using standard electromagnetic component production processes, thereby reducing overall manufacturing costs while maintaining backup steering functionality.
Solution Approach 2:
The patent employs electromagnetic actuators that can be designed as cost-effective, replaceable units. These actuators use standard electromagnetic components that are widely available and relatively inexpensive compared to mechanical clutch assemblies, allowing for more economical manufacturing and potential future upgrades.
3Device complexity
If wheel speed control is used for backup steering, then no additional mechanical structure is required, but control precision must be maintained
Solution Approach 1:
The patent implements a feedback control system that continuously monitors wheel speeds, vehicle yaw rate, and steering angle. The control unit processes this feedback information and adjusts the electromagnetic actuator's output in real-time to maintain precise steering control, compensating for any deviations caused by road conditions, vehicle load, or sensor inaccuracies.
Solution Approach 2:
The patent replaces mechanical steering linkages with an electromagnetic field-based control system. The electromagnetic actuator uses magnetic fields to generate forces that adjust wheel speeds, providing precise control without the play and wear associated with mechanical connections. This substitution enables more accurate steering control while reducing mechanical complexity.
Data Source
AI summary
The present disclosure provides a steer-by-wire control method and apparatus, and an electronic device, relating to the field of intelligent vehicle technologies. The method includes: obtaining a steering parameter of a vehicle, where the steering parameter is a steering ratio of a steering wheel to a tire; converting, based on the steering parameter, a steering signal of the steering wheel of the vehicle into a desired steering angle of the vehicle; and calculating a desired wheel speed of each of wheels of the vehicle based on the desired steering angle, and performing, for each of the wheels of the vehicle, wheel speed control for the wheel based on the desired wheel speed of the wheel.