Vehicle Crossing Deceleration Control Using Predicted Passage Timing
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Solution Overview
Problem
Existing vehicle control devices fail to properly finish deceleration control when a crossing target is moving before entering the predicted travel region of the own vehicle, leading to unnecessary continuation of deceleration control.
Innovation Solution
A vehicle control device that includes a control unit capable of determining a predetermined control finish condition, which includes an avoidance condition based on the own vehicle passage predicted time and the crossing target reaching predicted time, to decide when to finish deceleration control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deceleration control is continued when the crossing target is moving before entering the predicted travel region, then collision avoidance is ensured, but unnecessary deceleration control continues leading to reduced productivity
Solution Approach 1:
The control unit changes the control state from active deceleration control to finished deceleration control by evaluating temporal parameters (T1 and T2). When T1 < T2, the parameters indicate that the own vehicle will pass through the intersecting region before the crossing target arrives, so the control parameter changes to finish deceleration control, resolving the contradiction between continued safety monitoring and unnecessary deceleration.
2Productivity
If deceleration control is finished when the crossing target is moving before entering the predicted travel region, then vehicle passage efficiency is improved, but collision avoidance reliability may be reduced
Solution Approach 1:
The control unit performs preliminary evaluation of the temporal parameters T1 and T2 before finishing deceleration control. By calculating these parameters in advance and comparing them (T1 < T2), the system ensures that the own vehicle will pass through the intersecting region before the crossing target arrives, making the preliminary decision to finish deceleration control safe and reliable.
Solution Approach 2:
The control unit continuously monitors the positions and speeds of both the own vehicle and crossing target, calculating T1 and T2 in real-time. This feedback mechanism ensures that deceleration control is finished only when the temporal relationship T1 < T2 is satisfied, providing continuous verification that collision avoidance is maintained while improving passage efficiency.
Data Source
AI summary
A vehicle control device includes a vehicle control ECU configured to start deceleration control of controlling a braking device when a probability of collision between an own vehicle and a crossing target is high, and to finish the deceleration control when a predetermined control finish condition is satisfied. The control finish condition includes an avoidance condition satisfaction or dissatisfaction of which is determined when the crossing target is before crossing a predicted travel region of the own vehicle and the own vehicle and the crossing target are moving. The avoidance condition is satisfied when a predetermined condition is satisfied. The predetermined condition is set based on an own vehicle passage predicted time that is a predicted time taken by the own vehicle to pass through an intersecting region and a crossing target reaching predicted time that is a predicted time taken by the crossing target to reach the intersecting region.