Automated Vehicle Standstill Method via Speed Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driver assistance systems face challenges in safely bringing a vehicle to a standstill from high speeds, particularly in automated driving modes, while minimizing transitional states that increase risk for occupants and other road users.
Innovation Solution
A method involving a multi-phase deceleration profile that reduces vehicle speed to a transition range of 55-85 km/h, maintains this speed for a stabilization phase, and then brings the vehicle to a standstill, with deceleration limits to prevent rear-end collisions and allow for potential driver takeover during certain phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the vehicle is braked directly to a standstill from high speed, then the transfer to standstill is achieved quickly, but the risk of rear-end collisions and harm to occupants increases
Solution Approach 1:
The braking process is divided into multiple phases: first reducing speed to a transition range (55-85 km/h), then maintaining this speed for a stabilization period, and finally completing the standstill. This segmentation allows the system to balance rapid response with safety by preventing abrupt deceleration that could cause rear-end collisions or occupant injury.
Solution Approach 2:
The system performs preliminary speed reduction to a transition range before completing the full standstill. This preliminary action stabilizes the vehicle at a lower speed first, allowing following traffic to react and reducing the risk of sudden collisions, while still achieving the ultimate goal of bringing the vehicle to a standshall.
2Loss of time
If the vehicle speed is reduced rapidly to a standstill, then the minimal risk condition is achieved quickly, but transitional states with increased risk are assumed
Solution Approach 1:
The transition to minimal risk condition is segmented into phases: initial speed reduction to transition range, stabilization phase at transition speed, and final standstill. This ensures the vehicle does not pass through highly risky transitional states while still achieving rapid overall response.
Solution Approach 2:
The system changes the speed parameter in controlled steps rather than continuously. By maintaining speed within a specific transition range (55-85 km/h) during the stabilization phase, the system avoids creating transitional states with excessive risk while still progressing toward the minimal risk condition efficiently.
3Loss of time
If automated driving functions are fully active during emergency braking, then response is immediate, but driver intervention opportunities are reduced
Solution Approach 1:
The automated driving function is deactivated in segments: first during the speed reduction phase, then during the stabilization phase, but potentially remaining active or allowing takeover during the final standstill phase. This segmented deactivation balances immediate automated response with preserved driver intervention opportunities when safety allows.
Solution Approach 2:
The system dynamically adjusts the level of automation based on the braking phase. Automated functions are fully active initially for immediate response, then progressively deactivated as the vehicle enters stabilization and final standstill phases, allowing driver takeover capability to emerge when the situation becomes less critical.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method (2) for automatically bringing a vehicle to a standstill. The method comprises the following steps: Reducing (21) the speed of the vehicle to a transitional speed, which is in a transitional speed range of 55 km/h to 85 km/h; remaining (22) in the transitional speed range for a transitional period with a duration of at least 20 seconds; after the transitional period has elapsed, further reducing (23) the speed of the vehicle until the vehicle comes to a standstill.