Emergency Stop Point Selection for Automated Vehicles
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Solution Overview
Problem
Highly automated or fully automated motor vehicles face challenges in safely determining an emergency stop point, which can lead to increased risks of damage to the vehicle or other traffic participants due to the stopping process, especially when defects occur, as existing systems fail to minimize disruption to traffic flow and safety.
Innovation Solution
A method and device for determining an emergency stop point based on the vehicle's driving state, considering factors like speed, urgency, and environmental conditions, to select a location that minimizes risk, using a combination of onboard sensors and map data to assess potential stop points and control the vehicle's movement to ensure safe and controlled deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the motor vehicle stops quickly to minimize defect response time, then the response time is reduced, but the risk of damage to the vehicle or other traffic participants increases
Solution Approach 1:
The system performs preliminary analysis of the driving state and environment before executing the stop command. The processing device determines whether the current driving state allows for a safe emergency stop by evaluating factors such as speed, distance to obstacles, and road conditions in advance, thereby preventing harmful effects before they occur.
Solution Approach 2:
The system continuously monitors the driving state and environmental conditions, using sensor data to provide feedback to the processing device. This feedback loop enables real-time adjustment of the stop decision, allowing the system to minimize response time when conditions permit while preventing stops that would create excessive risk.
2Adaptability or versatility
If the motor vehicle stops at any available location to maximize stopping flexibility, then the stopping flexibility is improved, but the disruption to traffic flow increases
Solution Approach 1:
The system evaluates the local characteristics of potential stop locations by analyzing environmental data such as road type, traffic density, and surrounding infrastructure. Instead of applying a uniform stopping criterion, the processing device adapts the stop decision to the specific local conditions, selecting locations that minimize traffic disruption while maintaining stopping flexibility.
3Length of moving object
If strong deceleration is applied to reach a close stop point, then the stopping distance is reduced, but the risk of damage due to deceleration increases
Solution Approach 1:
The system dynamically adjusts the deceleration parameter based on the evaluated driving state and environmental conditions. When a close stop point is selected, the processing device calculates the appropriate deceleration rate that achieves the stop within the available distance while keeping the deceleration force within safe limits to prevent damage to the vehicle or surrounding objects.
Data Source
AI summary
A method for determining an emergency stop point for a motor vehicle includes steps of determining a driving state of the motor vehicle and determining an emergency stop point in the area of the motor vehicle on the basis of the driving state. The stop point is determined in such a way that a risk of stopping at the determined emergency stop point does not exceed a predetermined value.