Vehicle Steering Failover Control for Sensor Abnormalities
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Solution Overview
Problem
Existing vehicle steering systems lack effective mechanisms to ensure passenger and vehicle safety when steering abnormalities occur, such as faulty torque sensors or steering angle sensors.
Innovation Solution
A vehicle steering device and method that includes a control unit capable of directly controlling the steering output unit when a steering abnormality is detected, regardless of the operation of the steering input unit, and can transition to an autonomous driving mode, including a limp aside operation, to ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering input unit is controlled normally through the steering sensor, then the steering operation is accurate and responsive, but the system cannot ensure safety when the steering sensor fails to generate signals
Solution Approach 1:
The control unit is pre-programmed with autonomous driving modes and limp aside operations that automatically activate when steering sensor failure is detected. This preliminary preparation ensures that safety measures are instantly available without requiring manual intervention or system reconfiguration during the emergency.
Solution Approach 2:
The control unit acts as an intermediary between the steering input unit and steering output unit when sensor failure occurs. It receives the abnormality detection from the torque sensor and autonomously controls the steering output unit, mediating the control flow to bypass the failed steering sensor and maintain safe vehicle operation.
2Reliability
If the control unit directly controls the steering output unit when steering abnormality occurs, then passenger and vehicle safety is ensured, but the steering system complexity increases
Solution Approach 1:
The control unit is designed with multi-functionality, serving both as a normal control interface during regular operation and as an autonomous emergency control system when steering abnormalities occur. This universal design allows a single component to handle multiple operational modes without requiring separate dedicated systems for normal and emergency conditions.
Solution Approach 2:
The steering system implements self-service through the control unit's ability to autonomously detect steering abnormalities via the torque sensor and automatically switch to direct control modes. The system monitors itself and performs self-correction without external intervention, reducing the need for additional complex safety systems.
3Reliability
If the steering system operates in autonomous driving mode with limp aside operation, then the vehicle can be maneuvered to a safe location, but the response time and direct driver control are reduced
Solution Approach 1:
The steering control system dynamically adapts its operation mode based on real-time sensor feedback. When the steering sensor functions normally, the system operates in direct control mode with fast response. When failure is detected, it dynamically switches to autonomous limp aside mode, adjusting the control strategy according to the operational context and abnormality type.
Solution Approach 2:
The control unit contains pre-programmed limp aside operation sequences that are executed automatically upon detecting steering sensor failure. These preliminary action programs provide standardized safe maneuvering procedures that can be instantly deployed, ensuring consistent and reliable safety responses without requiring real-time complex decision-making.
Data Source
AI summary
The present disclosure provides a vehicle steering device and a vehicle steering method capable of ensuring safety of a passenger and a vehicle when a steering abnormality of the vehicle occurs. The vehicle steering device includes a steering input unit, a steering output unit connected to the steering input unit and a wheel, and a control unit configured to control the steering input unit and the steering output unit, in which, when a steering abnormality occurs in the steering input unit, the control unit directly controls the steering output unit regardless of the operation of the steering input unit.