Steer-by-Wire Steering Ratio and Damping Calibration
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Solution Overview
Problem
Current automobile vehicle steering systems lack the capability to optimize steering attributes in real-time, leading to degraded vehicle response characteristics due to aging components and varying road conditions, requiring frequent and pronounced steering adjustments.
Innovation Solution
A method that collects steer-by-wire data to determine driving quality objective indices, prepares trend lines using multiple algorithms, and generates real-time steering calibration modification commands to adjust damping, steering ratio, and base assist, optimizing steering characteristics continuously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If steering systems use fixed pre-settings (sport mode, comfort mode), then the system complexity is reduced and ease of operation is improved, but the adaptability to real-time driving conditions deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of steering characteristics by continuously monitoring driving conditions (vehicle speed, lateral acceleration, steering angle) and automatically modifying steering ratio, damping, and base assist in real-time. This replaces fixed pre-settings with a dynamic control system that adapts to current driving conditions, resolving the contradiction between ease of operation and adaptability.
2Reliability
If steering characteristics are optimized for specific conditions, then the driving response quality is improved, but the device complexity increases due to real-time data collection and processing requirements
Solution Approach 1:
The control system performs multiple functions using a single integrated architecture: it collects steering system data, calculates driving quality objective indices, determines optimal steering characteristics, and generates calibration modification commands. This multi-functional approach improves driving response quality while minimizing the increase in device complexity by consolidating functions rather than adding separate systems.
Solution Approach 2:
The system continuously monitors steering system data including steering wheel angle, vehicle speed, and lateral acceleration, then uses this feedback to calculate driving quality objective indices and automatically adjust steering characteristics. This closed-loop feedback mechanism enables real-time optimization of driving response quality without requiring complex manual intervention or multiple separate systems.
3Adaptability or versatility
If real-time steering calibration modification is implemented, then the adaptability and driving response are improved, but the device complexity and computational requirements increase
Solution Approach 1:
The system pre-calculates and stores steering calibration data for various driving conditions during system initialization or offline operations. During real-time operation, it selects and applies pre-prepared calibration modifications based on current driving conditions, reducing the computational burden during critical real-time control while maintaining high adaptability.
Data Source
AI summary
A method for optimizing vehicle steer-by-wire characteristics, includes collecting steer-by-wire steering system data for multiple predetermined data segments. Multiple driving quality objective indices are determined for each segment. A trend line is prepared based on the multiple predetermined data segments using a first algorithm, a second algorithm and a third algorithm, each assigned to one of the driving quality objective indices. Values obtained from the first algorithm, the second algorithm and the third algorithm are superimposed to create a net desired incremental change in damping, steering ratio and base assist. A steering calibration modification command is generated in real-time using the incremental change in damping, steering ratio and base assist.