Rear Wheel Steering Error Detection and Neutral Control
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Solution Overview
Problem
Existing rear wheel steering control systems in vehicles are prone to malfunctions due to errors in input signals, which can compromise occupant safety by affecting the accuracy of rear wheel steering angles and stability.
Innovation Solution
A method and apparatus that determine the presence of errors in input signals for rear wheel steering control, calculate a rear wheel angle reduction rate based on yaw rate, and control the rear wheels to neutral, thereby ensuring stability without requiring a separate mechanical apparatus for neutral control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rear wheel steering control is implemented using input signals, then rear wheel steering responsiveness and driving stability are improved, but errors in input signals cause malfunctions in rear wheel steering control
Solution Approach 1:
The control device performs preliminary error detection on input signals before they are used for rear wheel steering control. By checking the steering angle sensor signal and other input signals in advance, the system prevents erroneous signals from causing malfunctions, thereby improving reliability without adding complex mechanical components.
Solution Approach 2:
The system implements a feedback mechanism where the control device continuously monitors input signals and compares them against expected ranges. When errors are detected, the system provides feedback to adjust or reject the erroneous signals, preventing them from affecting rear wheel steering control accuracy and safety.
2Measurement precision
If a separate mechanical apparatus is added for rear wheel neutral control, then control accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the need for separate mechanical neutral control apparatus with a software-based control logic. The control device uses logical calculations to determine when rear wheels are at neutral position and how to return them to neutral, eliminating complex mechanical components while maintaining control precision.
Solution Approach 2:
The rear wheel steering system uses its own existing components (steering actuator, control device, sensors) to achieve neutral control functionality. The control device calculates and executes neutral return operations using the same actuator that provides steering control, making the system self-sufficient without additional dedicated mechanical neutral control mechanisms.
Data Source
AI summary
A method for controlling rear wheel steering of a vehicle may include: determining, by a control unit, whether an error exists in rear wheel steering control input information received therein to control rear wheel steering of the vehicle; calculating, by the control unit, a rear wheel angle reduction rate for controlling rear wheels to neutral based on a yaw rate of the vehicle when it is determined that an error exists in the rear wheel steering control input information; and controlling, by the control unit, the rear wheels to neutral according to the calculated rear wheel angle reduction rate.