Power Steering Control Unit Torque Compensation
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Solution Overview
Problem
Current power steering systems with dual motorizations face inefficiencies due to the inability to accurately distinguish between systematic and punctual differences in motor torque, leading to instability and poor compensation, especially during parking maneuvers and temperature-related stress.
Innovation Solution
A method that calculates and minimizes compensation requests based on the differences between target and actual motor torques, distinguishing between systematic and punctual differences to ensure precise torque compensation, thereby reducing the residue and maintaining system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation requests are calculated without distinguishing between systematic and punctual differences, then compensation coverage is maximized, but system stability deteriorates due to rebound phenomenon
Solution Approach 1:
The patent segments the torque difference into two distinct components: systematic difference (affecting both motorizations equally) and punctual difference (affecting only one motorization). This segmentation allows the control system to apply different compensation strategies to each component, preventing the rebound phenomenon while maintaining compensation effectiveness for actual faults.
Solution Approach 2:
The patent implements a feedback mechanism where the control unit continuously monitors the torque differences from both motorizations and uses this information to calculate appropriate compensation requests. The feedback loop enables dynamic adjustment of compensation based on real-time system state, distinguishing between temporary punctual differences and persistent systematic differences.
2Measurement precision
If all torque differences are compensated, then torque accuracy is improved, but system stability worsens due to rebound phenomenon
Solution Approach 1:
The patent applies local quality by treating systematic difference and punctual difference differently in the compensation strategy. Punctual differences (local, temporary deviations) are compensated to maintain torque accuracy, while systematic differences (global, persistent deviations) are left uncompensated to maintain system stability and avoid rebound effects.
3Reliability
If dual motorization is used for redundancy, then safety is improved, but device complexity increases
Solution Approach 1:
The patent merges the control of two independent motorizations into a unified control architecture where a single control unit manages both motorizations. The control unit receives torque requests and distributes them to both motorizations while calculating compensation requests based on their combined performance, simplifying the control structure while maintaining redundancy benefits.
Data Source
AI summary
A method for the control of a power steering system includes a first drive and a second drive which are arranged in parallel and implement an evaluation and regulation step calculating the first compensation request and the second compensation request as a function of the first deviation and of the second deviation.