Vehicle Risk Control for Narrow-Road Overtaking Scenarios
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Solution Overview
Problem
Existing vehicle control systems fail to adjust the start timing of risk reduction control effectively when an oncoming vehicle is likely to overtake a moving body on a narrow road, leading to insufficient reduction of contact risk.
Innovation Solution
A vehicle control device that executes risk reduction control by relaxing the start condition when specific conditions are met, including the road being narrow, an oncoming vehicle and a low-speed moving body present, high likelihood of the oncoming vehicle overtaking the moving body, and certain relative motion criteria, adjusting the threshold values based on relative speed and overlap rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the start condition of risk reduction control is based only on distance and relative speed, then the control system is simple, but the start timing cannot be adjusted according to the likelihood of oncoming vehicle overtaking, resulting in insufficient risk reduction
Solution Approach 1:
The system performs preliminary analysis of the road environment and oncoming vehicle behavior to predict the likelihood of overtaking before the actual risk materializes. By evaluating road width, presence of moving bodies, and vehicle speeds in advance, the system determines whether to lower the threshold for initiating risk reduction control, enabling earlier intervention when overtaking is likely
Solution Approach 2:
The start condition threshold for risk reduction control is made dynamic rather than fixed. The threshold automatically adjusts based on the calculated likelihood of overtaking - lowering when overtaking is likely and maintaining normal levels when it is not. This dynamic adjustment allows the system to respond appropriately to varying risk scenarios without requiring completely different control logic
2Loss of time
If the risk reduction control starts only when distance divided by relative speed is below a threshold, then the control logic is simple, but the control starts too late when the oncoming vehicle is likely to overtake a moving body
Solution Approach 1:
The system performs preliminary assessment of multiple factors (road width, presence of moving bodies, vehicle speeds) to predict overtaking likelihood before the critical moment arrives. This advance prediction enables the system to prepare for earlier intervention when overtaking is anticipated, rather than waiting for the basic distance-speed threshold to be triggered
Solution Approach 2:
The system introduces an intermediate evaluation layer between the basic distance-speed measurement and the final control decision. This intermediary layer calculates the likelihood of overtaking by analyzing additional factors such as road geometry and vehicle behavior, serving as a mediator that translates raw sensor data into contextualized risk assessment
Data Source
AI summary
The vehicle control device is configured such that the contact risk determination condition is relaxed when a first condition for determining that a road on which the own vehicle is traveling is a narrow road, an oncoming vehicle approaching the own vehicle and a second condition for determining that a moving body moving at a low speed exists between the oncoming vehicle and the own vehicle within the predetermined range, a third condition for determining that the oncoming vehicle is highly likely to reach a rear end of the moving body before the own vehicle reaches a front end of the moving body, and a fourth predetermined condition regarding a relative motion between the oncoming vehicle and the moving body are satisfied.