Intersection Driving Assist for Oncoming Lane Crossing Risk
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Solution Overview
Problem
Existing driving assist devices struggle to safely allow a host vehicle to cross an oncoming lane when an oncoming vehicle deviates from its predicted path, potentially leading to contact and disrupting the driver and occupants.
Innovation Solution
A driving assist device equipped with a traveling environment information acquisition unit, an oncoming vehicle information acquisition unit, and a driving assist controller that sets a predicted travel region for the oncoming vehicle based on its behavior and determines if contact is possible, activating Autonomous Emergency Braking if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the host vehicle changes course to cross the oncoming lane after the oncoming vehicle enters the intersection, then the host vehicle can proceed without waiting, but contact with the oncoming vehicle may occur if the oncoming vehicle deviates from its predicted path
Solution Approach 1:
The system performs preliminary action by setting a predicted travel region for the oncoming vehicle before the host vehicle actually changes course. The driving assist controller predicts where the oncoming vehicle will travel based on its current behavior, and uses this prediction to determine whether it is safe to proceed with the course change, thereby preventing contact while maintaining productivity
Solution Approach 2:
The system implements feedback by continuously monitoring the actual position of the oncoming vehicle and comparing it with the predicted travel region. When the oncoming vehicle deviates from its predicted path and enters the host vehicle's course change path, the system detects this deviation and activates emergency braking to prevent contact, thus resolving the contradiction between maintaining flow and ensuring safety
2Reliability
If the host vehicle waits for the oncoming vehicle to pass before changing course, then contact is avoided, but traffic efficiency is reduced
Solution Approach 1:
The system performs preliminary action by predicting the oncoming vehicle's travel region in advance. This prediction allows the host vehicle to make informed decisions about whether to proceed with course changes without waiting, thereby maintaining traffic efficiency while ensuring safety through proactive risk assessment
Solution Approach 2:
The system applies dynamics by adaptively adjusting the host vehicle's course change behavior based on real-time conditions. When the predicted travel region indicates low risk, the host vehicle can proceed dynamically without waiting. When deviation is detected, the system dynamically switches to emergency braking, thus optimizing both productivity and reliability based on actual conditions
3Reliability
If the system activates Autonomous Emergency Braking frequently to prevent contact, then safety is improved, but driver disturbance and occupancy comfort worsen
Solution Approach 1:
The system applies local quality by making emergency braking decisions based on local, specific conditions rather than applying a uniform safety margin in all situations. The predicted travel region analysis allows the system to identify specific high-risk scenarios where emergency braking is truly necessary, rather than braking conservatively in all cases, thus maintaining safety while reducing unnecessary interventions that would disturb the driver
Solution Approach 2:
The system performs preliminary action by predicting potential contact scenarios before they occur. This allows the system to activate emergency braking only when the prediction indicates actual risk, rather than using frequent conservative braking as a preventive measure, thereby maintaining reliability while minimizing driver disturbance through targeted, necessary interventions only
Data Source
AI summary
A driving assist device includes a driving assist controller. The driving assist controller is configured to perform driving assistance when the vehicle changes a course by crossing the oncoming lane. The driving assist controller sets a predicted travel region based on behavior of the oncoming vehicle when the oncoming vehicle is approaching the vehicle that enters an intersection. When the vehicle enters the predicted travel region in a travel path of the vehicle, the driving assist controller determines whether there is a possibility of contact between the vehicle and the oncoming vehicle based on the predicted travel region and the travel path of the vehicle. The driving assist controller causes the vehicle to stop outside of the predicted travel region when there is a possibility of the contact.