Lane Change Control for Oncoming Vehicle Crossing Risk
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Solution Overview
Problem
Existing vehicle assistance systems fail to effectively prevent oncoming vehicles from approaching a host vehicle during lane changes, leading to potential collisions and unstable driving control.
Innovation Solution
A travel assistance method that detects oncoming vehicles and adjusts the host vehicle's route and speed to ensure a safe lane change by determining a crossing point and changing the driving control information to maintain a safe time difference with the oncoming vehicle, thereby preventing collisions and stabilizing the driving process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the host vehicle performs a lane change using the determined route and vehicle speed, then the lane change efficiency is improved, but another vehicle traveling outside the travel route may approach and face the host vehicle in front, creating a collision risk
Solution Approach 1:
The system performs preliminary detection of oncoming vehicles and prediction of crossing points before the lane change is executed. By calculating the time difference between the host vehicle reaching the crossing point and the oncoming vehicle reaching the crossing point in advance, the system can determine whether the lane change should proceed or be modified, preventing potential collisions before they occur.
Solution Approach 2:
The system dynamically adjusts the lane change parameters (route and/or vehicle speed) based on the detected oncoming vehicle and calculated time difference. When the time difference falls within the predetermined risky range, the system modifies the lane change execution by changing at least one of the route or vehicle speed to make the time difference fall outside the risky range, thereby adapting the lane change process to real-time conditions.
2Reliability
If the system modifies the lane change route or vehicle speed to avoid oncoming vehicles, then collision risk is reduced, but the lane change time and efficiency are increased
Solution Approach 1:
The system changes the parameters of the lane change operation (route coordinates and/or vehicle speed) to avoid the collision risk. By calculating the optimal modified parameters that make the time difference fall outside the predetermined risky range, the system achieves collision avoidance while minimizing the impact on lane change time.
Data Source
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AI summary
The present invention provides a travel assistance method for performing a lane change of a host vehicle using a determined route and vehicle speed. The travel assistance method includes: detecting an oncoming vehicle traveling in an opposite lane opposite to a lane in which the host vehicle travels when the host vehicle starts the lane change; determining a crossing point between a virtual advancing route and a linear advancing route in which the oncoming vehicle advances linearly, the virtual advancing route differing from the route and being a virtual extension of an advancing route of the host vehicle in an advancing direction during a period from start to end of the lane change; executing a lane change using the route and the vehicle speed in a case where a time difference between a first predicted time when it is assumed that the host vehicle reaches the crossing point and a second predicted time until the oncoming vehicle reaches the crossing point is outside a predetermined range; and when the time difference is within the predetermined range, executing a lane change by changing at least one of the route and the vehicle speed such that the time difference is outside the predetermined range.