Steering Error Compensation in Motor-Driven Power Steering
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Solution Overview
Problem
Advanced driving assistance systems (ADAS) face challenges in handling abnormal command steering angles, which can lead to instability and safety issues during vehicle operation, as existing fail-safe functions are inadequate in addressing these errors.
Innovation Solution
An apparatus and method that include a command steering angle correction module to detect and correct abnormal command steering angles by restricting, attenuating, and filtering them based on lateral acceleration, vibration, and change in steering angular velocity, ensuring the motor-driven power steering system operates within safe parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the command steering angle is directly controlled by the advanced driving assistance system, then the automation extent is improved, but the reliability deteriorates due to abnormal command steering angles causing vehicle instability
Solution Approach 1:
A command steering angle correction module is introduced as an intermediary between the ADAS and the motor-driven power steering system. This module detects abnormal command steering angles and corrects them before they reach the steering control system, thereby maintaining automation while ensuring reliability through an additional safety layer
Solution Approach 2:
The correction module continuously monitors command steering angles and compares them against expected ranges. When abnormalities are detected, the system provides feedback by correcting the steering angle, creating a closed-loop control mechanism that maintains system reliability without reducing automation
2Reliability
If the fail-safe function is enhanced to handle abnormal command steering angles, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The fail-safe function for handling abnormal command steering angles is merged with the existing motor-driven power steering system rather than being implemented as a separate standalone system. The correction module integrates with the current steering control architecture, improving reliability while minimizing additional complexity
Solution Approach 2:
The command steering angle correction module serves multiple functions: it monitors command steering angles, detects abnormalities, corrects erroneous values, and maintains system stability. This multi-functional approach improves reliability without proportionally increasing device complexity
Data Source
AI summary
Disclosed are an apparatus for and a method of compensating for a steering error in an advanced driving assistance system, and the apparatus includes a command steering angle correction module that corrects a command steering angle according to whether or not the command steering angle input from the advanced driving assistance system satisfies a preset error compensation condition; and a motor control unit that controls a motor of a motor-driven power steering system according to the command steering angle corrected by the command steering angle correction module.