Vehicle Deceleration Control Using Preliminary Action
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automated driving systems face challenges in balancing driving safety and efficiency, particularly when the state of obstacles or following moving bodies is uncertain, as they often require detection before executing vehicle control measures, which can lead to inefficiencies or increased collision risks.
Innovation Solution
A vehicle control system that utilizes deceleration features to set target decelerations based on first and second deceleration phases, comparing minimum deceleration values to determine appropriate deceleration settings, even if the state of obstacles or following moving bodies is uncertain, thereby ensuring compatibility between safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system waits to detect obstacle presence before executing vehicle control, then driving efficiency is maintained, but driving safety is compromised due to delayed response
Solution Approach 1:
The system performs preliminary deceleration before obstacle detection is confirmed by comparing minimum deceleration values. When the first-class minimum deceleration (required to avoid collision) is greater than the second-class minimum deceleration (tolerable by following vehicle), the system proactively decelerates in advance, ensuring safety without waiting for certain obstacle detection.
2Reliability
If the system executes vehicle control prior to obstacle detection, then driving safety is improved, but driving efficiency decreases due to excessive caution
Solution Approach 1:
The system dynamically adjusts the deceleration parameter based on the comparison between first-class and second-class minimum deceleration values. By changing the deceleration parameter only when safety requirements exceed following vehicle tolerances, the system avoids unnecessary deceleration and maintains driving efficiency while ensuring safety when needed.
3Reliability
If the system applies minimum deceleration to avoid collision, then collision avoidance is ensured, but rear-end collision risk increases from following moving body
Solution Approach 1:
The system applies preliminary anti-action by comparing deceleration requirements before execution. When the required deceleration to avoid collision exceeds what the following vehicle can tolerate, the system preemptively adjusts the deceleration profile to prevent the harmful effect of rear-end collision, rather than waiting for the collision risk to materialize.
Data Source
AI summary
In deceleration set processing, first-class and second-class deceleration are specified. The first-class deceleration is deceleration of the vehicle corresponding to a first-class state. The first-class state is a state of a slowdown target of the vehicle. The second-class deceleration is deceleration of a following moving body corresponding to a second-class state. The second-class state is a state of the vehicle as viewed from the following moving body. If a minimum value of the first-class deceleration (a first-class minimum value) is equal to or greater than a minimum value of the second-class deceleration (a second-class minimum value), target deceleration is set to the first-class minimum value. Otherwise, based on a second-class minimum value phase, the target deceleration is set to deceleration equal to or greater than the second-class minimum value. The second-class minimum value phase is a phase to which the second-class minimum value belongs in a second deceleration feature.