Steering Vibration Factor Estimation for Electric Power Steering
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Solution Overview
Problem
Existing methods for analyzing and suppressing vibrations in electric power steering systems require significant time and effort, and adjusting controller settings without identifying vibration factors can be ineffective.
Innovation Solution
An input/output device that estimates vibration factors by extracting feature amounts from response data using a vibration factor estimation unit, reducing the need for manual analysis and enabling efficient controller settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If users manually analyze vibration factors each time vibration occurs, then vibration suppression can be achieved, but it takes a significant amount of time and effort
Solution Approach 1:
The system automatically estimates vibration factors by itself without requiring user intervention. The vibration factor estimation unit processes response data, extracts feature amounts, and identifies vibration factors autonomously, making the system serve itself in analyzing vibration causes.
Solution Approach 2:
The patent replaces manual mechanical analysis with an automated estimation system that uses response data and feature amount extraction algorithms to identify vibration factors, substituting human effort with an automated computational system.
2Reliability
If controller settings are adjusted by trial and error without specifying vibration factors, then some vibration suppression may be achieved, but it is not a fundamental measure and requires significant time
Solution Approach 1:
The system performs preliminary estimation of vibration factors before adjusting controller settings. By first identifying the vibration factor through feature amount extraction and then determining appropriate controller settings based on the estimation result, the system avoids trial-and-error approaches.
Solution Approach 2:
The system uses response data from the electric power steering device as feedback to continuously estimate vibration factors and adjust controller settings accordingly, creating a closed-loop system that adapts based on actual vibration conditions.
3Reliability
If mechanical characteristics, frequency characteristics, or noise characteristics are identified and controller is set accordingly, then vibration can be suppressed, but vibration or noise may still occur due to identification errors or unintended disturbances
Solution Approach 1:
The system dynamically estimates vibration factors during steering operations rather than using fixed pre-identified characteristics. The vibration factor estimation unit processes real-time response data and extracts feature amounts adaptively, allowing the system to respond to changing vibration conditions and unexpected disturbances.
Data Source
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AI summary
An input/output device (3) includes: a vibration factor estimation unit (32) configured to be connected for communication to a control device for controlling a rotating machine provided in an electric power steering device provided in a vehicle to generate a steering assist force for a steering, to acquire, during a steering operation of the steering, response data indicating a response to a steering operation of the electric power steering device detected by the control device, to extract a feature amount related to a vibration or a noise generated during the steering operation of the steering from the response data, and to estimate a vibration factor candidate, which is a candidate for a vibration factor, based on the feature amount; and an output unit (33) configured to output the vibration factor candidate.