Active Power Steering Torque Compensation for Vehicle Pull and Drift
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Solution Overview
Problem
Conventional power steering assist systems fail to quickly respond to continuously changing road conditions, such as road inclination and camber, leading to inadequate compensation for short-term pull and drift, which affects driving comfort and safety.
Innovation Solution
A method and system for controlling directional stability in vehicles using active power steering assistance, which involves acquiring vehicle dynamics data, identifying directional stability states, measuring torque, calculating compensation torques, and actuating the power steering system to counteract measured torques, thereby differentiating between long-term and short-term pull/drift and providing real-time corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional power steering assist systems are used, then the system structure is simple and energy consumption is low, but the response speed to changing road conditions is slow and short-term pull/drift compensation is inadequate
Solution Approach 1:
The patent segments the compensation function into two distinct parts: long-term pull/drift compensation (handled by conventional PDC systems) and short-term pull/drift compensation (handled by the new dynamic compensation system). This segmentation allows each subsystem to specialize in specific time scales of compensation, improving overall response speed without requiring a complete redesign of the entire steering system.
Solution Approach 2:
The patent introduces dynamic characteristics to the power steering assist system by implementing a dynamic compensation torque calculation that responds to real-time road conditions. The system dynamically adjusts compensation based on detected vehicle state and road conditions, transforming the static conventional PDC into a dynamic system that can quickly adapt to changing conditions.
2Reliability
If conventional PDC systems are used, then the system is easy to operate, but the compensation for short-term pull and drift is insufficient
Solution Approach 1:
The patent merges the conventional long-term PDC system with a new short-term dynamic compensation system into a unified power steering assist system. The control unit integrates both compensation torques (long-term and short-term) to provide comprehensive directional stability. This merging approach ensures reliable compensation across all time scales while maintaining a single integrated control architecture that does not significantly complicate system operation.
3Reliability
If the power steering system provides pure power assistance, then energy consumption is reduced, but the ability to quickly respond to changing road conditions is limited
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously detects vehicle state (such as steering angle, vehicle speed, and lateral acceleration) and road conditions, then adjusts the compensation torque accordingly. This closed-loop feedback system enables the electric power steering to adapt quickly to changing road conditions by providing appropriate compensation only when and where needed, optimizing energy consumption while maintaining high reliability.
Data Source
AI summary
A steering system to control a directional stability of a vehicle may include an active power steering assistance system, a sensor to detect vehicle dynamics data of the vehicle, a sensor to detect a torque of a steering system of the vehicle, and a controller. The controller may be configured to determine a torque value based on the vehicle dynamics data, calculate a torque component based on a difference between the torque value and the torque of the steering system, calculate a preliminary compensation torque on a basis of the torque component, calculate a final compensation torque by adding the preliminary compensation torque and the torque value, and actuate the active power steering assistance system based upon the final compensation torque. Systems and methods for controlling directional stability of a vehicle may compensate for short-term pull/drift and long-term pull/drift.