Rear-Wheel Steering Stick-Slip Detection and Limited Motor Control
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Solution Overview
Problem
Rear wheel steering (RWS) systems experience a hardware stick-slip phenomenon, leading to noticeable noise and a uniform reduction in control performance at specific vehicle speeds, without distinguishing between high-quality and defective products.
Innovation Solution
A rear wheel steering apparatus and control method that detect stick-slip by monitoring differences in target and actual movement distances, motor current output, and estimated vs. actual movement distances, and control the motor to operate in a limited mode to mitigate stick-slip effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If control performance is uniformly lowered at specific vehicle speed to reduce stick-slip noise, then noise level is reduced to acceptable levels, but RWS system control performance deteriorates
Solution Approach 1:
The system applies different control strategies based on local product quality characteristics. High-quality products maintain full control performance while defective products with stick-slip issues operate in limited mode, rather than uniformly degrading all products
Solution Approach 2:
The system continuously monitors actual movement distance and compares it with target movement distance to detect stick-slip occurrences in real-time, enabling dynamic adjustment of control mode based on detected conditions
2Object-affected harmful factors
If control performance is uniformly lowered for all products, then noise from stick-slip is reduced, but product quality differentiation is lost
Solution Approach 1:
The system treats different product quality levels differently by detecting stick-slip characteristics and applying appropriate control modes - full performance for high-quality products and limited mode for defective products
Solution Approach 2:
The system automatically detects product quality level through stick-slip detection and self-adjusts control mode without external intervention, allowing each product to operate in the mode appropriate to its quality
3Reliability
If stick-slip detection is implemented to differentiate product quality, then control performance is maintained for high-quality products, but system complexity increases
Solution Approach 1:
The system uses feedback from existing sensors (linear position sensor, motor current) to detect stick-slip occurrences, comparing actual movement with target movement to identify defective products
Solution Approach 2:
The system uses the existing motor and position sensor as intermediaries to detect stick-slip phenomena, rather than adding dedicated detection hardware, thereby minimizing system complexity
Data Source
AI summary
The present disclosure relates to a rear wheel steering apparatus and a control method thereof, which can detect stick-slip that may occur during the operation of a rear wheel steering (RWS) system, thereby controlling the performance of a motor in a variable manner, and can control the motor to operate in a limited operation mode only when the stick-slip has occurred during the operation of the RWS system, thereby reducing the noise generated by the stick-slip and the shock transmitted to a vehicle.