Power Steering Oscillation Detection and Dynamic Assistance Control
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Solution Overview
Problem
Power steering systems cause oscillations at the steering wheel due to design limitations and driving conditions, leading to discomfort and vehicle instability.
Innovation Solution
A method and system for detecting and mitigating oscillations by identifying, classifying, and adjusting power steering features based on vehicle features and driving scenarios using a machine learning algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power steering assistance is increased to reduce steering effort, then ease of operation is improved, but oscillations increase causing vehicle instability
Solution Approach 1:
The power steering system dynamically adjusts assistance levels based on real-time oscillation detection. When oscillations are detected, the system reduces or disables assistance temporarily, then gradually restores it as oscillations subside, creating a dynamic balance between steering ease and stability
Solution Approach 2:
The system implements a feedback loop that continuously monitors steering wheel oscillations and adjusts power steering assistance accordingly. The oscillation mitigation system receives feedback from oscillation sensors and modifies assistance levels in response, creating a closed-loop control system that balances steering effort and stability
2Reliability
If power steering assistance is reduced to eliminate oscillations, then vehicle stability is improved, but steering effort increases reducing ease of operation
Solution Approach 1:
The system applies periodic action by temporarily disabling power steering assistance in pulses when oscillations are detected, then restoring it when oscillations subside. This periodic modulation of assistance allows the system to eliminate oscillations while minimizing the overall impact on steering effort during normal operation
Solution Approach 2:
The system applies partial action by reducing power steering assistance to the minimum necessary level rather than completely disabling it. This allows the system to mitigate oscillations while maintaining some level of steering assistance, thereby reducing rather than eliminating the impact on ease of operation
3Reliability
If oscillation mitigation is applied aggressively to eliminate oscillations quickly, then vehicle stability is improved rapidly, but steering control precision is reduced
Solution Approach 1:
The system performs preliminary action by gradually reducing power steering assistance over multiple iterations rather than abruptly disabling it. This gradual reduction allows the system to mitigate oscillations while maintaining more precise steering control throughout the mitigation process
Data Source
AI summary
Techniques are provided for vehicle oscillation control. In one embodiment, the techniques involve identifying an oscillation at a steering wheel or steering column of a vehicle, upon determining that the oscillation exceeds an oscillation of interest threshold, identifying the oscillation as an oscillation of interest, classifying a cause of the oscillation of interest, and mitigating the oscillation of interest based on the classification of the cause.