MDPS Disturbance Compensation Steering Control
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Solution Overview
Problem
Motor driven power steering (MDPS) systems face challenges in disturbance robustness, particularly in high-performance vehicles, where vibrations are amplified due to high gear ratio steering, high grip tires, and high rigidity suspension/steering mountings, leading to unstable steering feelings and increased noise, vibration, and harshness (NVH) issues.
Innovation Solution
A disturbance compensation steering control method and system that calculates a final compensation amount based on vibration strength from the tire to the steering wheel, using the difference in steering angular velocities between motor and steering angle sensors to reduce disturbances by operating the steering motor opposite to the vibration direction, thereby enhancing disturbance robustness and NVH performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high gear ratio steering, high grip tire, and high rigidity suspension/steering mounting/setting are applied to enhance vehicle performance, then steering responsiveness and grip are improved, but vibration and disturbance are amplified and directly delivered to the steering
Solution Approach 1:
The patent converts the harmful vibration and disturbance signals into useful information by detecting them with angle sensors and using them as input for disturbance compensation control. The controller calculates compensation amounts based on these detected vibrations and applies opposite corrections through the steering motor, transforming the harmful effects into a basis for active compensation and stabilization.
Solution Approach 2:
The patent implements a closed-loop feedback system where angle sensors continuously detect the steering angle and motor angle, the controller processes these signals to identify vibrations and disturbances, calculates compensation amounts, and applies corrections through the steering motor. This continuous feedback loop enables real-time suppression of steering vibrations and improves disturbance robustness.
2Stability of the object's composition
If MDPS compensation logic provides steering assist and restoration values, then steering stability is maintained through basic steering functions, but disturbance robustness is insufficient as vibration control is not a primary control target
Solution Approach 1:
The patent transitions from static compensation values to dynamic disturbance compensation control. The system continuously detects vibrations and disturbances during steering operations, calculates time-varying compensation amounts based on current disturbance levels, and applies dynamic corrections. This dynamic approach enables the system to adapt to changing disturbance conditions and significantly improves disturbance robustness while maintaining steering stability.
3Power
If steering motor operates to provide steering assist, then power steering assistance is achieved, but vibration and noise are not actively suppressed leading to poor NVH performance
Solution Approach 1:
The patent applies preliminary anti-action by detecting vibrations and disturbances before they propagate through the steering system, calculating compensation amounts that oppose the detected disturbances, and applying corrective forces through the steering motor. This proactive approach suppresses vibrations and noise at their source, preventing them from reaching the driver and significantly improving NVH performance while maintaining steering assist functionality.
Data Source
AI summary
A disturbance compensation steering control method may include, when a steering controller performs, during driving, a disturbance detection in which a tire and a steering wheel become a transfer path, performing a disturbance reduction compensation control by calculating a final compensation amount for a disturbance compensation steering output transmitted to a steering motor according to a disturbance strength and a magnitude of a steering torque.