Intersection Turn Support Readiness During Late Lane Changes
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Solution Overview
Problem
Existing driving support devices fail to ensure safety during lane transitions at intersections, particularly when the adjacent lane is absent, leading to potential safety hazards due to delayed lane entry and increased vehicle speed.
Innovation Solution
A driving support device that includes a control device to maintain the readiness for driving support until a predetermined time or distance has elapsed after a lane transition, ensuring deceleration control is initiated when necessary, regardless of lane presence, thus supporting safe lane changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving support device immediately transitions to the state where driving support cannot be started when an adjacent traveling lane is present, then the device complexity is reduced, but the safety at the intersection deteriorates due to delayed lane entry timing
Solution Approach 1:
The control device enters a preliminary state (driving support start possible) when an adjacent traveling lane is absent, and maintains this state for a predetermined period even after the lane becomes present. This preliminary action allows the driver sufficient time to execute the lane change and turn operation before the system transitions to the driving support unavailable state, thereby ensuring safety without requiring complex real-time decision logic.
2Ease of operation
If the driving support device requires immediate lane change execution when adjacent lane is absent, then the response time is reduced, but the ease of operation deteriorates as drivers cannot adapt to slight timing delays
Solution Approach 1:
The system dynamically adjusts the driving support availability based on the driver's actual lane change execution. By maintaining the driving support start possible state for a predetermined period after the adjacent lane becomes present, the system adapts to variations in driver reaction time and lane change execution speed, providing operational flexibility without extending the overall time loss at the intersection.
3Reliability
If the driving support device eliminates the predetermined period holding function, then the productivity of the control system is improved, but the safety deteriorates due to abrupt transition when lane presence changes
Solution Approach 1:
The control device incorporates a predetermined period holding function that acts as a cushioning transition period. When the adjacent traveling lane status changes from absent to present, the system maintains the driving support start possible state for a predetermined period before transitioning to unavailable. This beforehand cushioning prevents abrupt transitions that could compromise safety, while the predetermined period is optimized to minimize impact on overall system productivity and intersection throughput.
Data Source
AI summary
Provided is a driving support device (1) including a control device configured to enter, in a first situation that is a situation in which an own vehicle travels in a predetermined region (X) before an intersection and an adjacent traveling lane is absent on a first direction side in a crossing direction of a traveling lane (L0) on which the own vehicle is traveling, a state in which start of driving support for changing a traveling direction of the own vehicle to the first direction at the intersection is possible, and enter, in a second situation that is a situation in which the own vehicle travels in the predetermined region (X) and an adjacent traveling lane is present on the first direction side in the crossing direction of the traveling lane (L0), a state in which the start of the driving support is impossible. When transition to the second situation occurs without execution of a lane change after the control device enters the state in which the start of the driving support is possible in the first situation, the control device holds the state in which the start of the driving support is possible until a second time point that is one of: a time point when a predetermined time has elapsed from a first time point that is a time point when the transition to the second situation occurs; or a time point when the own vehicle has traveled over a predetermined distance from the first time point.