Driving Support Device Intersection Notification Timing
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Solution Overview
Problem
Existing driving support devices do not consider changes in traffic signal states and flow when notifying drivers of oncoming vehicles at intersections, leading to unsuitable notifications during path changes by vehicles.
Innovation Solution
A driving support device with a notification unit and electronic control unit that detects path changes and acquires traffic signal states, restricting notifications until the signal permits the turn, based on vehicle speed and time elapsed, ensuring notifications align with traffic flow changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If notification is performed immediately when a turn is permitted by the traffic signal, then the driver receives timely information about oncoming vehicles, but the notification may occur during the vehicle's acceleration phase causing driver annoyance and reducing notification effectiveness
Solution Approach 1:
The system performs preliminary detection of the traffic signal state change from prohibited to permitted turn, and prepares the notification in advance. However, it delays the actual notification until after the vehicle completes acceleration and reaches a stable cruising speed, ensuring the notification occurs at an appropriate moment when the driver is not occupied with acceleration operations.
2Adaptability or versatility
If notification is restricted until the vehicle is ready to turn, then the notification timing aligns with traffic flow, but the notification may be delayed too long reducing its usefulness
Solution Approach 1:
The system dynamically adjusts the notification timing based on real-time vehicle state parameters including acceleration phase detection and cruising speed recognition. The notification is triggered at the optimal moment when the vehicle transitions from acceleration to cruising, adapting to the actual driving conditions rather than using a fixed delay period.
3Measurement precision
If the system monitors vehicle speed and traffic signal states to determine notification timing, then notification accuracy improves, but the device complexity increases
Solution Approach 1:
The system continuously monitors vehicle speed and acceleration state, and uses this feedback information to determine the appropriate notification timing. The control unit detects when the vehicle completes acceleration and reaches cruising speed, then triggers the notification at this optimal moment, creating a closed-loop control system that adapts to actual driving conditions.
Data Source
AI summary
A driving support device is configured to restrict notification of information on a presence of an oncoming vehicle in an opposing path entering the intersection to a driver of a host vehicle over a restriction period which is a period from a first time point at which it is determined that a state of a traffic signal has been switched from a first state in which the turn of the host vehicle is prohibited to a second state in which the turn of the host vehicle is permitted to a time point at which it is estimated that the host vehicle is able to perform the turn at an intersection based on information on the state of the host vehicle after the first time point, and to release the restriction of the notification of the information when the restriction period has elapsed from the first time point.