Rear-Wheel Steering Control Using Torque Data
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Solution Overview
Problem
Conventional four-wheel steering systems fail to control rear-wheel steering when steering angle sensor data is abnormal, potentially impairing vehicle avoidance functions in emergency situations.
Innovation Solution
A rear-wheel steering control apparatus that collects vehicle data including steering angle, torque, speed, yaw rate, and lateral acceleration, determines the normalcy of steering angle data, and generates control signals for degraded rear-wheel steering based on alternative data when abnormalities are detected, allowing for stable rear-wheel steering even with malfunctioning sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the general four-wheel steering system operates based on steering angle information from a driver, then the system can control rear-wheel steering under normal conditions, but the avoidance function is impeded when steering angle sensor data is abnormal
Solution Approach 1:
The control system dynamically switches between normal mode (using steering angle sensor data) and degraded mode (using steering torque sensor data) based on the operational status of sensors. This dynamic adaptation ensures continuous rear-wheel steering control capability regardless of sensor malfunction conditions
Solution Approach 2:
The steering torque sensor serves as an intermediary data source that can compensate for steering angle sensor failures. The control unit acts as a mediator that selects appropriate input data based on sensor status, ensuring continuous operational capability
2Device complexity
If the system uses only steering angle data for rear-wheel steering control, then the control logic is simple, but the system cannot operate when steering angle sensor malfunctions
Solution Approach 1:
The control system is designed with multi-functionality to handle both normal operation (using steering angle data) and degraded operation (using steering torque data). This universal design allows the same system to adapt to different operational conditions without requiring separate control systems
3Ease of operation
If the system disables rear-wheel steering when steering angle data is abnormal, then control simplicity is maintained, but vehicle safety and avoidance capability are compromised
Solution Approach 1:
The system prepares alternative control pathways in advance by having the steering torque sensor and degraded control logic ready before sensor failures occur. This prior preparation ensures that safety capabilities are maintained without adding complexity to normal operation
Data Source
AI summary
The present invention provides a rear-wheel steering control technique. Specifically, a rear-wheel steering control apparatus for controlling rear-wheel steering control, according to an aspect of the present invention, may include: a vehicle data collection unit configured to receive vehicle data including at least one of steering angle data, steering torque data, vehicle speed data, yaw rate data, or lateral acceleration data; a vehicle data determination unit configured to determine whether or not the steering angle data included in the vehicle data is normal; and a rear-wheel steering control unit configured to generate a rear-wheel steering control signal for degradation rear-wheel control based on at least one of the steering torque data, the vehicle speed data, the yaw rate data, or the lateral acceleration data when the steering angle data is determined to be abnormal.