Automated Steering Angle Limits for Curved Road Compliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automated steering control systems deactivate on curved roads when maximum horizontal acceleration is exceeded, leading to inconvenience and safety concerns due to frequent transfer of control authority to the driver.
Innovation Solution
A vehicle system that determines a steering angle limit based on road curvature changes, limiting steering angle control to prevent excessive acceleration and deactivating automated steering when necessary, while providing visual cues and speed adjustments to ensure compliance with legal limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If automated steering control is implemented on curved roads, then automation level is improved, but horizontal acceleration exceeds legal limits causing system deactivation
Solution Approach 1:
The system dynamically adjusts the steering angle limit based on real-time vehicle speed and road curvature information. When approaching a curved road, the controller calculates an appropriate steering angle limit that prevents horizontal acceleration from exceeding legal limits, thereby maintaining automated steering control stability and preventing unnecessary deactivation.
Solution Approach 2:
The system changes the steering angle limit parameter according to vehicle speed and road conditions. By adjusting this parameter dynamically, the system ensures that automated steering control remains within legal acceleration limits while maintaining effective automation on curved roads.
2Reliability
If steering angle limit is reduced to comply with acceleration limits, then legal compliance is improved, but automated steering effectiveness deteriorates
Solution Approach 1:
The steering angle limit is not fixed but dynamically adjusted based on vehicle speed and road curvature. At lower speeds or on gentle curves, the system allows larger steering angles to maintain effectiveness, while at higher speeds or on sharp curves, it reduces the limit to ensure legal compliance. This dynamic adjustment resolves the contradiction between compliance and effectiveness.
Solution Approach 2:
The system changes the steering angle limit parameter adaptively based on operating conditions. By modifying this parameter in real-time, the system achieves both legal compliance and maintained steering effectiveness across different driving scenarios.
3Reliability
If automated steering control is deactivated frequently, then acceleration limits are satisfied, but driver convenience and safety deteriorate
Solution Approach 1:
The system performs preliminary calculations of the steering angle limit before automated steering control is activated or before entering curved road sections. By pre-calculating appropriate limits based on speed and curvature data, the system prevents situations that would trigger deactivation, thereby maintaining continuous automation and improving driver convenience while ensuring compliance.
Solution Approach 2:
The system continuously monitors vehicle speed, road curvature, and horizontal acceleration, using this feedback to dynamically adjust the steering angle limit. This closed-loop control ensures compliance with acceleration limits while maintaining automated steering control, preventing frequent deactivation and improving driver convenience.
Data Source
AI summary
A vehicle includes a steering device; a travel information means obtaining travel information of a vehicle; a road information means obtaining road information on a travel road of the vehicle; and a controller controlling the steering device based on the travel information and the road information, wherein the controller is configured to determine a steering angle limit depending on a curvature change of the road, and performs automated steering control based on the steering angle limit.