Roundabout Entry Braking Zones for Vehicle Roll And Collision Control
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Solution Overview
Problem
Autonomous vehicles face challenges in maintaining driving stability and preventing collisions when navigating roundabouts, particularly due to excessive rolling caused by driving on sloping parts of traffic islands, especially at high speeds.
Innovation Solution
A system and method for controlling vehicle entry into a roundabout by setting defense zones based on traffic island dimensions and vehicle speed, using an autonomous driving controller to activate braking when the vehicle enters specific zones to prevent collisions and stabilize the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the vehicle drives on the sloping part of the traffic island to avoid shaking, then the vehicle load stability is improved, but the vehicle may collide with the traffic island or structures near it
Solution Approach 1:
The autonomous driving controller pre-calculates defense zones based on traffic island geometry and vehicle parameters before the vehicle reaches the roundabout. This preliminary action allows the vehicle to approach the optimal path in advance, maintaining load stability while avoiding collision risks through pre-planned trajectory adjustment.
Solution Approach 2:
The system dynamically adjusts the defense zone boundaries and vehicle trajectory based on real-time vehicle speed, size, and roundabout geometry. This dynamic adaptation allows the vehicle to maintain stability on sloping parts while automatically adjusting the safety margin to prevent collisions with traffic islands.
2Productivity
If the vehicle travels at high speed through the roundabout, then the productivity is improved, but excessive roll occurs and driving stability is reduced
Solution Approach 1:
The autonomous driving controller applies preliminary anti-action by calculating and applying counteracting forces through braking control before the vehicle enters the high-risk zone. This preemptive braking reduces vehicle speed and roll moment in advance, preventing excessive roll while maintaining overall productivity through optimized speed management.
Solution Approach 2:
The system changes key parameters including vehicle speed, defense zone boundaries, and braking force based on real-time conditions. By dynamically adjusting these parameters, the system maintains driving stability at high speeds while preserving productivity through intelligent speed optimization rather than uniform speed reduction.
3Reliability
If autonomous driving is performed to avoid the sloping part of the traffic island, then the collision risk is reduced, but roll occurs due to vehicle rotation
Solution Approach 1:
The system applies local quality by creating differentiated defense zones with varying safety margins based on the specific geometry of the traffic island and vehicle position. This localized approach allows the vehicle to safely navigate around sloping parts while minimizing unnecessary vehicle rotation and roll by optimizing the avoidance trajectory for each specific situation.
4Area of stationary object
If the vehicle drives excessively close to the traffic island, then the area utilization is improved, but collision with the traffic island or nearby structures may occur
Solution Approach 1:
The system dynamically adjusts the defense zone boundaries based on vehicle speed, size, and roundabout geometry, allowing the vehicle to optimally utilize the roundabout area. This dynamic adjustment enables the vehicle to drive closer to the traffic island when safe, improving area utilization while maintaining collision avoidance through real-time boundary adaptation.
Data Source
AI summary
A system for controlling a vehicle entering a roundabout includes a sensor unit configured to recognize a traffic island provided in the roundabout. The system also includes an autonomous driving controller configured to set defense zones based on the traffic island and a speed of the vehicle. The defense zones may indicate danger zones that one or both of i) cause collision between the vehicle and the traffic island or ii) deteriorate stability of the vehicle based on the traffic island and a speed of the vehicle. The system may additionally include a braking controller configured to perform braking of the vehicle entering the defense zones.