Adaptive Drive Assist Deceleration at Green-Light Stops
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Solution Overview
Problem
Existing drive assist devices control vehicle deceleration based on vehicle-to-vehicle distance and relative speed, potentially causing unexpected rapid deceleration when a preceding vehicle is expected to start moving, contrary to the driver's expectation.
Innovation Solution
A drive assist device that includes sensors and a processor to adjust vehicle speed and distance control, allowing for a slower deceleration mode when certain conditions are met, such as a green traffic light and a stopped preceding vehicle, to align with driver expectations and reduce the risk of contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive assist device controls the host vehicle to decelerate rapidly to maintain a target vehicle-to-vehicle distance when a preceding vehicle is stopped, then the vehicle-to-vehicle distance control reliability is improved, but the driver expectation alignment deteriorates causing contrary-to-expectation control
Solution Approach 1:
The drive assist device dynamically adjusts the deceleration control mode based on detected traffic light conditions. When a green traffic light is detected ahead of the stopped preceding vehicle, the system switches from rapid deceleration control to slow deceleration control, making the control behavior adaptive to the traffic situation and aligned with driver expectations
Solution Approach 2:
The system changes the deceleration parameter (deceleration rate) based on traffic light detection. When a green light is detected, the deceleration parameter is reduced to produce slower deceleration, whereas without green light detection, the normal rapid deceleration parameter is applied to maintain safe following distance
2Reliability
If the drive assist device applies strong deceleration control to prevent collision with a stopped preceding vehicle, then the collision prevention capability is improved, but the control smoothness deteriorates causing abrupt deceleration
Solution Approach 1:
The system dynamically selects between two deceleration control modes based on traffic light detection. In situations where a green light is detected (indicating the stopped vehicle will likely move soon), the system applies gentle slow deceleration control, reserving strong deceleration for situations where the preceding vehicle is likely to remain stopped
Data Source
AI summary
When the preceding vehicle is stopped in front of the traffic light, the lighting color of the traffic light is “green”, the other vehicle is not stopped immediately before the preceding vehicle, the direction indicating light of the preceding vehicle is off, and the distance between the host vehicle and the preceding vehicle at the time when the preceding vehicle is detected exceeds a threshold value, the processor controls the predetermined device so that the host vehicle travels at a constant speed, or controls the predetermined device of the host vehicle so that the speed of the host vehicle decreases in the second mode that is slower than the first mode.