Lane Change Trajectory Planning at Traffic-Lane Splits
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Solution Overview
Problem
Existing driver-assistance systems for lane changes at traffic-lane splits fail to effectively manage collision risks and merging issues, particularly in urban environments, as they do not ensure a safe and timely lane change without interfering with following vehicles.
Innovation Solution
A method and system that senses traffic-lane splits, determines the vehicle's position, and calculates a trajectory for a lane change at a predefined point in time after the split, ensuring no trailing vehicle can reach the target lane first, while considering maximum lateral acceleration and distance from lane restrictions, using sensors like ultrasonic, radar, lidar, and cameras, and integrating with navigation systems for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a lane change is executed immediately at the traffic-lane split, then the lane change maneuver is completed quickly, but the risk of collision with trailing vehicles increases
Solution Approach 1:
The system performs preliminary detection of the traffic-lane split and calculates the optimal lane change trajectory before the vehicle reaches the split point. By anticipating the need for lane change and preparing the trajectory in advance, the system ensures that the lane change is executed at the precise optimal moment - immediately after the split - thereby minimizing execution time while avoiding collision with trailing vehicles that have not yet reached the split point.
2Duration of action of moving object
If the lane change trajectory is extended further back before the split, then the lane change can be initiated earlier, but the vehicle may interfere with following vehicles in the target lane
Solution Approach 1:
The system continuously monitors the positions of surrounding vehicles using sensors and uses this feedback information to dynamically adjust the lane change trajectory. By detecting the real-time positions of trailing vehicles and calculating their speeds, the system determines the optimal trajectory that initiates the lane change at the precise moment when it is safe to do so - early enough to complete the maneuver before trailing vehicles reach the split, but not so early as to interfere with vehicles already in or approaching the target lane.
3Ease of manufacture
If existing sensors and navigation systems are utilized for lane change assistance, then system costs are reduced, but the system must effectively integrate multiple existing systems
Solution Approach 1:
The system is designed to utilize existing multi-functional sensors and navigation systems already present in modern vehicles. The same sensors used for other driver assistance functions are repurposed for lane change assistance at traffic-lane splits. The navigation system, already used for route guidance, is integrated to provide split point information. This multi-functional approach reduces costs by avoiding duplicate hardware while the control unit integrates these existing systems through software processing to achieve the lane change assistance function.
Data Source
AI summary
A method for operating a driver-assistance system for the lateral guidance of a motor vehicle in a lane change from a current lane to a target lane in a traffic-lane split. Also provided is a driver-assistance system for the lateral guidance of a motor vehicle in a lane change from a current lane to a target lane in a traffic-lane split. The driver-assistance system encompasses a trajectory-ascertainment device, which is configured to ascertain a trajectory for the lane change of the motor vehicle from the current lane to the target lane so that the lane change from the current lane to the target lane is carried out at a predefined point in time following the traffic-lane split.