Static Steering Ratio Selection for Predictable Vehicle Control
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Solution Overview
Problem
Motor vehicle steering systems with variable electronic steering ratios can cause unpredictability for drivers, leading to insecure and suboptimal steering actions due to unexpected variations in steering ratios during driving operations.
Innovation Solution
A method that allows drivers to manually select a static steering ratio, which is either preset or chosen from variable options, using an actuating device connected to the electronic steering system, ensuring predictable driving characteristics by controlling the steering angle of steerable wheels through an electronic steering system with a sensor and adjusting device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If variable electronic steering ratios are used, then steering adaptability to different driving conditions is improved, but driver predictability and confidence deteriorate due to unexpected variations
Solution Approach 1:
The system dynamically adjusts the steering ratio based on detected driving conditions (manual vs. automatic mode). When manual mode is detected, the system provides a static steering ratio for predictability. When automatic mode is detected, the system enables variable steering ratios for adaptability. This dynamic switching resolves the contradiction by providing the appropriate steering characteristic based on the detected operating mode.
Solution Approach 2:
The electronic steering system changes the steering ratio parameter based on the detected driving mode. In manual mode, the steering ratio is kept static to ensure driver confidence. In automatic mode, the steering ratio becomes variable to improve adaptability. This parameter change strategy allows the system to optimize both driver confidence and adaptability under different operating conditions.
2Productivity
If variable steering ratios are automatically controlled, then steering optimization for different conditions is improved, but driver control and predictability worsen
Solution Approach 1:
The system includes a detection device that automatically detects whether the vehicle is operating in manual or automatic mode and autonomously adjusts the steering ratio accordingly. This self-service mechanism eliminates the need for the driver to manually select between static and variable steering ratios, thereby maintaining ease of operation while achieving steering optimization through automatic mode-based adjustment.
Solution Approach 2:
The system uses feedback from the detection device to determine the current operating mode and adjusts the steering ratio based on this feedback. When manual mode is detected, the system provides a static steering ratio for driver control. When automatic mode is detected, the system enables variable steering ratios for optimization. This feedback mechanism ensures both driver control and steering optimization are maintained.
Data Source
AI summary
A method operates a steering system of a motor vehicle having a steerable wheel controlled using a steering wheel. The method begins by ascertaining a prevailing control angle of the steering wheel of the motor vehicle. A variable steering ratio between the prevailing control angle and a steering angle of the steerable wheel is defined. A static steering ratio from the variable steering ratio to set the steering angle of the steerable wheel is then selected.