Vehicle Steering Ratio Control for Automated Turning Trajectories
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Solution Overview
Problem
Conventional driver assistance systems require manual driver intervention during automated turning maneuvers, such as steering wheel adjustments, which can be uncomfortable and inefficient.
Innovation Solution
A control device that identifies the curve radius and curvature profile to automatically adjust the steering ratio, using closed-loop control to maintain a defined steering wheel angle without requiring manual input, utilizing sensors and map data to determine a target trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automated turning control is implemented without steering ratio adjustment, then automation extent is improved, but driver comfort deteriorates due to requiring manual grip changes
Solution Approach 1:
The system dynamically adjusts the steering ratio based on the identified curve profile during automated turning maneuvers. The control device continuously adapts the steering ratio to match the curve radius and curvature requirements, enabling fully automated control without requiring the driver to manually adjust their grip on the steering wheel.
2Device complexity
If fixed steering ratio is used during automated turning, then device complexity is reduced, but manufacturing precision of target trajectory deteriorates
Solution Approach 1:
The control device changes the steering ratio parameter dynamically during automated turning based on the identified curve profile. By adjusting the steering ratio according to the curve radius and curvature, the system achieves accurate target trajectory following while maintaining relatively simple system architecture.
3Manufacturing precision
If continuous steering ratio control is implemented, then target trajectory accuracy is improved, but device complexity increases
Solution Approach 1:
The control device performs preliminary identification of the curve profile (radius and curvature) before executing the automated turning maneuver. By pre-determining the steering ratio adjustments needed based on the curve characteristics, the system achieves accurate target trajectory following while avoiding the need for complex real-time continuous adjustment mechanisms.
4Device complexity
If automated steering control without curve profile identification is used, then device complexity is reduced, but measurement precision of turning parameters deteriorates
Solution Approach 1:
The control device introduces an intermediary curve profile identification step that determines the steering ratio based on curve radius and curvature characteristics. This intermediary process enables precise automated steering control by translating curve geometric parameters into appropriate steering ratio adjustments, achieving measurement precision without excessive system complexity.
Data Source
AI summary
A controller for controlling the operation of a motor vehicle includes an electronic control unit that ascertains a target trajectory for a turning maneuver of the motor vehicle, ascertains the curve of the radius and/or the curvature of the curve of the target trajectory based on the target trajectory, and controls the steering of the motor vehicle based on the ascertained curve of the radius and/or the curvature of the curve. The steering is controlled via a continuous control of the steering ratio and/or the setting of a fixed value for the steering ratio.