Vehicle Behavior Prediction for Narrow-Road Passing Priority
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Solution Overview
Problem
Conventional vehicle-behavior prediction methods struggle to determine the order of priorities for vehicles passing through narrow roads when they cannot exchange information, leading to delayed avoidance actions.
Innovation Solution
A vehicle-behavior prediction method that determines the priority of host and concerned vehicles using object detection, map acquisition, and controller-based processing, allowing for prompt avoidance actions by adjusting the threshold for starting action based on priority, even without information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If information exchange function is required between host vehicle and vehicle concerned to determine priority, then priority determination accuracy is improved, but system complexity and reliability deteriorate when communication fails
Solution Approach 1:
The patent uses map information as an intermediary to determine vehicle priority without requiring direct communication between vehicles. The map data serves as a neutral mediator that provides passing place location information, allowing the host vehicle to independently assess priority based on its position relative to the passing place, thus resolving the contradiction between accurate priority determination and system reliability without communication.
Solution Approach 2:
The host vehicle independently determines its own priority by using its detected position and map information, without relying on information from the vehicle concerned. This self-service approach eliminates the need for inter-vehicle communication while maintaining reliable priority determination, as each vehicle autonomously assesses its situation based on available data.
2Reliability
If information exchange is required between vehicles to determine passing priority, then collision avoidance reliability is improved, but response time deteriorates due to communication delays or failures
Solution Approach 1:
The system performs preliminary determination of vehicle priority using map information and detected position before any potential conflict occurs. By pre-assessing priority based on passing place location and vehicle position, the system eliminates the need for time-consuming communication exchanges during critical moments, thus improving response time while maintaining collision avoidance reliability.
Solution Approach 2:
Each vehicle independently and immediately determines its priority status using its own position data and map information, without waiting for communication from the other vehicle. This self-service mechanism eliminates communication delays entirely, enabling immediate avoidance actions while maintaining high reliability through autonomous decision-making.
3Reliability
If the host vehicle waits for a fixed time threshold before taking avoidance action, then false alarms are reduced, but response time to actual hazards increases
Solution Approach 1:
The patent dynamically adjusts the time threshold for avoidance actions based on the determined priority of the host vehicle. When the host vehicle has high priority (passing place is behind it), a longer time threshold is applied to reduce false alarms. When priority is low (passing place is ahead), a shorter threshold enables faster response. This dynamic adjustment resolves the contradiction between reducing false alarms and improving response time.
Solution Approach 2:
The system changes the time threshold parameter based on the priority determination result. By adjusting this critical parameter according to the host vehicle's relative position to the passing place, the system optimizes the balance between avoiding false alarms and responding quickly to genuine hazards, with the threshold becoming more sensitive when priority is low and more conservative when priority is high.
Data Source
AI summary
A vehicle-behavior prediction device includes: a priority determination section that determines the priority of a host vehicle and a vehicle concerned when the host vehicle and the vehicle concerned pass through a road section; and a vehicle control section that sets the time from when the vehicle concerned stops to when the host vehicle starts action to avoid the vehicle concerned to be shorter in a case where the priority of the host vehicle is low than in a case where the priority of the host vehicle is high.