Steer-By-Wire Failure Backup Using Wheel Speed Difference
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Solution Overview
Problem
Steer-by-wire systems in vehicles lack a reliable backup mechanism to ensure vehicle steerability in case of electronic or electrical failures, posing safety risks and increasing system complexity and cost.
Innovation Solution
A control method that utilizes wheel speed difference and positive kingpin offset to determine a target steering angle for vehicle wheels when the steer-by-wire system fails, without requiring additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electronic clutch apparatus is added to provide mechanical steering capability when steer-by-wire system fails, then vehicle steerability is ensured during failure, but system structural complexity and cost increase
Solution Approach 1:
The patent extracts and utilizes existing components (wheel speed sensor, kingpin offset data, brake system) that are already part of the vehicle's standard equipment. By leveraging these pre-existing elements, the system creates a backup steering mechanism without adding the electronic clutch apparatus, thereby maintaining reliability while reducing device complexity
Solution Approach 2:
The patent makes the existing brake system serve a dual function: its primary function for stopping the vehicle and a secondary function for providing steering capability during steer-by-wire failure. By applying differential braking forces to the wheels, the system achieves steering control without requiring dedicated steering components, thus reducing overall system complexity
2Reliability
If an electronic clutch apparatus is added to provide mechanical steering capability when steer-by-wire system fails, then vehicle steerability is ensured during failure, but cost control deteriorates
Solution Approach 1:
The patent extracts and utilizes existing components (wheel speed sensor, kingpin offset data, brake system) that are already part of the vehicle's standard equipment. By leveraging these pre-existing elements, the system creates a backup steering mechanism without adding the electronic clutch apparatus, thereby maintaining reliability while reducing device complexity
Solution Approach 2:
The patent enables the existing brake system to serve itself by providing an additional steering function. The same brake actuators that are already installed for stopping the vehicle are repurposed to generate differential braking forces for steering control during failure, eliminating the need for separate steering components and reducing overall system cost
Data Source
AI summary
The present disclosure provides a vehicle and a control method, a control apparatus, and a storage medium thereof. The method includes: obtaining a wheel speed difference at a current vehicle speed when it is determined that a steer-by-wire system of the vehicle is failed; obtaining a positive kingpin offset value; and determining, based on the wheel speed difference and the positive kingpin offset value, a target steering angle of a vehicle wheel, and controlling the vehicle wheel based on the target steering angle. The method provided in the present disclosure can enables steering control of the vehicle based on the wheel speed difference and a positive kingpin offset when the steer-by-wire system fails, and no additional components are required. In this way, an off-system backup for the failed steer-by-wire system is achieved, improving vehicle safety and reducing costs.