Steering Wheel Angle Conversion for Cross-Vehicle Lateral Guidance
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Solution Overview
Problem
Existing driver assistance systems for automated lateral guidance in motor vehicles require vehicle-specific adaptations and threshold adjustments due to differences in steering systems, making them inefficient and inflexible across various vehicle types.
Innovation Solution
A control unit that determines a conversion factor based on target and actual steering angles, allowing for a uniform comparison and control of lateral guidance without requiring vehicle-specific settings, using a quotient of target steering angles and positions to establish equivalent angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vehicle-specific variables and predefined thresholds are used for target steering angle comparison, then the system can be implemented in specific vehicle types, but the system requires complete algorithm reset and new threshold definitions for each vehicle type
Solution Approach 1:
The patent transforms the comparison parameter from vehicle-specific physical variables (steering rack position, pinion angle) to a universal parameter (steering wheel angle) that can be directly compared across different vehicle types. This parameter change eliminates the need for vehicle-specific algorithm adaptations while maintaining accurate target steering angle comparison.
Solution Approach 2:
The patent creates a universal control approach where the same algorithm and threshold definitions can be applied across different vehicle types by using steering wheel angle as the common parameter. This universalization allows the driver assistance system to function consistently in various vehicle configurations without requiring vehicle-specific adaptations.
2Reliability
If steering rack position or pinion angle are used as manipulated variables, then the system can achieve precise control for specific vehicle configurations, but the system becomes inapplicable to vehicles with different steering systems
Solution Approach 1:
The patent introduces the steering wheel angle as an intermediary parameter that bridges different steering system configurations. Instead of directly comparing vehicle-specific variables like steering rack position or pinion angle, the system uses steering wheel angle as a common mediator that can be measured and compared across all vehicle types, ensuring both precision and compatibility.
Solution Approach 2:
The patent separates the control system into two independent parts: the vehicle-specific steering system (which generates target steering angles through its own mechanics) and the universal comparison system (which uses steering wheel angle for consistent evaluation). This segmentation allows each part to maintain its optimal characteristics while working together seamlessly.
Data Source
AI summary
A control unit is provided for operating a driver assistance system for automated lateral guidance of a motor vehicle. The control unit is configured, in a first operating state of the driver assistance system, to determine a target position of a steering wheel of the motor vehicle on the basis of the target steering angle of the motor vehicle which is stipulated by the driver assistance system in the first operating state, and to determine a quotient from the target steering angle which is stipulated by the driver assistance system in the first operating state, and from the target position which is determined therefrom, in order to determine a conversion factor. The control unit is configured, in a second operating state of the driver assistance system which is temporally sequential to the first operating state, by the application of the conversion factor thus determined, to determine a target steering angle equivalent on the basis of the target position of the steering wheel which is stipulated by the driver assistance system in the second operating state, by the application of the conversion factor thus determined, to determine an actual steering angle equivalent on the basis of an actual position of the steering wheel which is determined in the second operating state, and to control an operation of the driver assistance system on the base of a target value/actual value comparison of the target steering angle equivalent and the actual steering angle equivalent.