Driving Support Apparatus Intersection Arrival Time Prediction
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Solution Overview
Problem
Existing driving support systems may implement unnecessary collision avoidance measures when a pedestrian has already crossed the road, leading to driver discomfort due to mismatched actual and implemented support situations.
Innovation Solution
A driving support apparatus that predicts the time for both the host vehicle and the pedestrian to reach an intersection, using these predictions to determine the necessity of support through a map-based system, continuing support if the pedestrian's speed is low and the time is within certain thresholds, even if initial determination suggests no support is needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving support is implemented based on lateral movement speed and detection angle alone, then collision avoidance support is provided, but unnecessary driving support may be implemented when the pedestrian has already crossed the road
Solution Approach 1:
The system performs preliminary actions by predicting the arrival times of both the host vehicle and the moving object at the intersection before making the final driving support determination. This allows the system to anticipate whether the moving object will have already crossed by the time the vehicle arrives, preventing unnecessary driving support implementation and improving both reliability and driver comfort.
2Reliability
If driving support is implemented for all cases with low lateral movement speed, then collision avoidance is ensured, but driver discomfort occurs due to mismatch between actual situation and implemented support
Solution Approach 1:
The system dynamically adjusts the driving support determination by continuously monitoring the relationship between the predicted arrival time of the host vehicle and the predicted arrival time of the moving object. This dynamic adjustment allows the system to maintain high collision avoidance coverage while avoiding unnecessary interventions that would cause driver discomfort, resolving the contradiction between reliability and ease of operation.
3Device complexity
If the system uses only lateral movement speed threshold for determination, then the determination process is simple, but it cannot accurately distinguish between pedestrians who will cross and those who have already crossed
Solution Approach 1:
The system transitions from a one-dimensional determination based solely on lateral movement speed to a two-dimensional determination by introducing the time dimension. By predicting and comparing the arrival times of the host vehicle and the moving object at the intersection, the system achieves accurate detection of pedestrian crossing status without significantly increasing determination process complexity.
Data Source
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AI summary
There is provided a driving support apparatus and a driving support method that enable implementation of an effective driving support by appropriately determining necessity of the driving support. A driving support apparatus 1 includes a collision time prediction unit 31 that predicts a TTC and a TTV, a driving support determination unit 35 that applies the TTC and TTV to a map M and determines whether the driving support in the host vehicle is to be implemented or not, a driving support control unit 39 that controls the driving support in the host vehicle, an extension mode determination unit 37 that determines whether a speed of the moving object in a direction crossing the traveling direction is equal to or less than a first threshold value and whether the TTC is equal to or less than a second threshold value or not, and determines that the driving support is to be implemented in the host vehicle in a case where the above conditions are satisfied. In a case where the extension mode determination unit 37 determines that the driving support is to be implemented, even in a case where the driving support determination unit 35 determines that the driving support is not to be implemented, driving support control unit 39 continues to implement the driving support in the host vehicle.