Adaptive Deceleration Timing for Vehicle Follow-Up Control
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Solution Overview
Problem
Existing vehicle control systems face challenges in maintaining appropriate deceleration of a host vehicle during follow-up running control, especially when there are variations in braking response characteristics between the host vehicle and the preceding vehicle, leading to difficulties in maintaining inter-vehicle time during deceleration.
Innovation Solution
A vehicle control device and method that include a follow-up running control unit, deceleration jerk acquisition unit, and deceleration timing control unit, which acquire and respond to deceleration jerk information of the preceding vehicle to adjust the deceleration start timing and inter-vehicle time or distance based on the relative deceleration performance, ensuring synchronized deceleration irrespective of differences in braking response characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If follow-up running control is implemented to reduce driver burden, then ease of operation is improved, but reliability deteriorates when braking response characteristics differ between vehicles
Solution Approach 1:
The control device calculates the deceleration jerk of the host vehicle in advance and uses this information to determine the appropriate deceleration start timing. By preparing the deceleration jerk value beforehand, the system can accurately predict when to start decelerating to maintain the desired inter-vehicle time, even when braking characteristics differ from the preceding vehicle.
Solution Approach 2:
The system dynamically adjusts the deceleration start timing based on the calculated deceleration jerk parameter. When the deceleration jerk indicates rapid deceleration is needed, the system advances the start timing accordingly. This parameter-based adjustment allows the follow-up running control to adapt to different braking scenarios and maintain reliability despite vehicle characteristic variations.
2Reliability
If deceleration timing is advanced for small-sized preceding vehicles with high braking performance, then safety is improved, but loss of time increases
Solution Approach 1:
The system calculates the deceleration jerk parameter to determine the appropriate deceleration start timing. By using this dynamic parameter, the system can advance deceleration timing only when necessary (when high deceleration jerk is detected), rather than always advancing it. This allows the system to maintain safety for vehicles with high braking performance while avoiding unnecessary time loss in normal deceleration scenarios.
Data Source
AI summary
Vehicle control includes: acquiring running information of a preceding vehicle that runs ahead of a host vehicle; controlling a running state of the host vehicle on the basis of the acquired running information; acquiring deceleration jerk information of the preceding vehicle; and changing a deceleration start timing, at which the host vehicle is decelerated in response to deceleration of the preceding vehicle, on the basis of the deceleration jerk information of the preceding vehicle. Alternatively, vehicle control includes: acquiring deceleration jerk information of a preceding vehicle that runs ahead of a host vehicle; and changing an inter-vehicle time or inter-vehicle distance between the preceding vehicle and the host vehicle on the basis of the deceleration jerk information of the preceding vehicle.