Steer-by-Wire Backup Steering 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 regulatory challenges while adding an electronic clutch transforms the system into a modified traditional steering system with increased complexity and cost.
Innovation Solution
A control method utilizing wheel speed difference and positive kingpin offset to determine a target steering angle, enabling steering control without additional components, thus providing an off-system backup for the failed steer-by-wire system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electronic clutch apparatus is added to provide mechanical steering capability when steer-by-wire fails, then vehicle steerability is ensured, but structural complexity and cost increase
Solution Approach 1:
The invention utilizes the vehicle's existing wheel speed difference mechanism (designed for differential driving/braking) to provide steering capability when steer-by-wire fails. The system serves itself by repurposing existing components rather than adding new backup mechanisms, thereby ensuring steerability without increasing structural complexity
Solution Approach 2:
The wheel speed difference mechanism, originally designed for differential driving and braking operations, is made multi-functional by enabling it to also provide steering capability during steer-by-wire failures. This universal approach allows one system to fulfill multiple functions, eliminating the need for dedicated backup steering components
2Reliability
If an electronic clutch apparatus is added to provide mechanical steering capability when steer-by-wire fails, then vehicle steerability is ensured, but cost increases
Solution Approach 1:
The invention leverages the vehicle's existing wheel speed difference mechanism to provide emergency steering capability, eliminating the need to manufacture and install additional electronic clutch apparatus. The system uses resources already present in the vehicle, thereby reducing manufacturing costs while ensuring steerability
Solution Approach 2:
By making the wheel speed difference mechanism multi-functional (serving both differential driving/braking and emergency steering), the invention avoids the need to manufacture separate backup steering components, thereby reducing overall manufacturing costs while maintaining vehicle steerability
3Adaptability or versatility
If mechanical connections are eliminated in steer-by-wire system, then spatial constraints are reduced and intelligent driving cockpit design is improved, but safety risk increases due to lack of backup steering capability
Solution Approach 1:
The invention prepares for potential steer-by-wire failures by establishing a backup steering mechanism using the wheel speed difference capability. This beforehand cushioning ensures that even though mechanical connections are eliminated, safety is maintained through a pre-established alternative steering path that activates upon system failure
Solution Approach 2:
The vehicle's existing wheel speed difference mechanism, designed for differential operations, is made to also provide emergency steering capability. This self-service approach maintains safety without requiring additional mechanical backup components, thereby preserving the spatial layout flexibility benefits of the steer-by-wire system
Data Source
Figure 1~3
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.