Vehicle Control Device Using Overlap Rate for Braking Timing
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Solution Overview
Problem
Existing vehicle control systems face challenges in accurately determining the start and termination times of automatic braking control and transition from braking to steering control when an oncoming vehicle strays onto the traveling lane, leading to potential delays in collision avoidance and increased risk of rear-end collisions.
Innovation Solution
A vehicle control apparatus that includes a time-to-collision acquisition unit, an overlap rate acquisition unit, and a determination unit to assess the relative positional relationship between the vehicle and obstacles, allowing for earlier initiation of automatic braking and transition to steering control based on increasing or decreasing overlap rates, thereby optimizing collision avoidance strategies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic braking control is initiated based on traditional time-to-collision thresholds, then collision avoidance is achieved, but response timing is delayed when overlap rate is increasing
Solution Approach 1:
The system performs preliminary action by detecting an increasing overlap rate trend and initiating braking control before the traditional time-to-collision threshold is reached. This early detection mechanism allows the system to prepare and execute braking earlier, reducing response time while maintaining collision avoidance effectiveness.
Solution Approach 2:
The system dynamically adjusts braking control timing based on the real-time change trend of the overlap rate. When the overlap rate is increasing, the system activates braking earlier; when stable or decreasing, it uses traditional timing. This dynamic adaptation resolves the contradiction between early response and reliable collision avoidance.
2Reliability
If automatic braking control is extended to ensure collision avoidance, then safety is improved, but unnecessary braking increases reducing comfort
Solution Approach 1:
The system dynamically adjusts braking duration based on the overlap rate change trend. When the overlap rate is decreasing, indicating the obstacle is moving away laterally, the system terminates braking earlier than traditional methods. This dynamic adjustment ensures safety by maintaining braking when needed while reducing unnecessary braking to improve comfort.
Solution Approach 2:
The system uses feedback from the overlap rate measurement to continuously adjust braking control timing and duration. By monitoring whether the overlap rate is increasing or decreasing, the system optimizes braking activation and termination timing, balancing safety requirements with comfort by avoiding unnecessary prolonged braking.
3Reliability
If traditional collision avoidance control is used, then basic safety is maintained, but transition timing from braking to steering control is delayed
Solution Approach 1:
The system performs preliminary action by detecting the decreasing overlap rate trend and initiating the transition from braking control to steering control before traditional timing. This early detection allows the system to prepare for steering intervention, reducing the overall response time while maintaining basic safety through coordinated control transition.
Data Source
AI summary
A vehicle control apparatus includes a time-to-collision acquisition unit that acquires time to collision that is a time period until a time of collision of an own vehicle with a front obstacle, an overlap rate acquisition unit that acquires an overlap rate indicating a relative positional relationship between the own vehicle and the front obstacle in a lateral direction perpendicular to a traveling direction of the own vehicle, a determination unit that performs execution determination of automatic braking control of the own vehicle, on the basis of the time to collision and the overlap rate, and that, when the overlap rate is increasing by the front obstacle approaching the own vehicle in the lateral direction, determines start timing of the automatic braking control as earlier timing than when the overlap rate is not increasing, and an automatic controller that executes the automatic braking control at the start timing.