Pull Drift Compensation Using Differential Drive Steering Redundancy
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Solution Overview
Problem
Existing pull drift compensation technologies have limitations such as a small compensation range, motor blocking, and lack of redundancy control, which increase driver maneuvering burden and risk of motor failure.
Innovation Solution
A pull drift compensation assist system and method that utilizes differential drive assist steering as a primary system and electric power steering as a backup, with iterative torque calculations to gradually reduce driver hand force to zero, incorporating redundancy to enhance compensation range and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual pull drift correction is used, then the vehicle can maintain lane position, but the driver experiences fatigue and the operation is complex
Solution Approach 1:
The system enables self-service by automatically detecting lane markings and calculating drift compensation amounts without driver intervention. The control unit autonomously determines the vehicle's position relative to the lane center and applies corrective steering, eliminating the need for continuous manual correction and reducing driver fatigue.
Solution Approach 2:
The patent replaces the mechanical manual steering system with an automated electronic control system. Sensors detect lane markings, the control unit processes this information to calculate drift compensation, and actuators automatically adjust the steering angle, substituting manual mechanical operation with an integrated sensing-computing-actuating system.
2Measurement precision
If existing drift compensation systems are used, then some automatic correction is provided, but they lack precision in determining vehicle position and drift amount
Solution Approach 1:
The system achieves multi-functionality by using a single imaging device that simultaneously performs multiple tasks: detecting lane markings, determining vehicle position relative to the lane, calculating drift amount, and providing feedback for correction. This universal approach improves measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The control unit acts as an intermediary that processes raw imaging data and converts it into precise vehicle position and drift measurements. By introducing this computational mediator, the system achieves high measurement precision through algorithmic processing rather than through complex hardware modifications.
3Speed
If aggressive drift correction is applied, then vehicle return to lane center is faster, but vehicle stability is compromised during correction
Solution Approach 1:
The system applies dynamic control by continuously adjusting the drift compensation amount based on real-time vehicle position and drift measurements. The control unit modulates the correction strength dynamically, increasing it when the vehicle is far from the lane center and reducing it as the vehicle approaches the center, thereby achieving fast return while maintaining stability.
Solution Approach 2:
The patent implements feedback control by continuously monitoring vehicle position relative to the lane center and using this information to adjust the drift compensation amount. The control unit processes feedback from the imaging device and modifies the steering correction accordingly, enabling the vehicle to return to the lane center quickly while maintaining stability through closed-loop control.
Data Source
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AI summary
Embodiments of this application disclose a pull drift compensation assist system and a control method. The control method includes: determining status information of differential drive assist steering; and when differential drive assist steering works, performing pull drift compensation through differential drive assist steering; or when differential drive assist steering fails, performing pull drift compensation through electric power steering. The assist system includes a control module, a main compensation module, and an auxiliary compensation module that communicate with each other. In the technical solutions provided in embodiments of this application, compensation can be performed through differential drive assist steering, to effectively reduce occurrence of a long-time motor blocking phenomenon, reduce a motor fault risk, and reduce a motor performance deterioration degree. Compensation through differential drive assist steering may expand a hand force compensation range. Main/auxiliary system redundancy backup of differential drive assist steering and electric power steering may reduce a failure probability of pull drift compensation, and improve running safety of a vehicle. Long-term compensation and short-term compensation are performed concurrently, so that compensation for both deviation caused by an external factor and deviation caused by a factor of the vehicle may be implemented.