Adaptive Warning Time for Automatic Emergency Braking
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Solution Overview
Problem
Existing automatic emergency brake systems in vehicles often use fixed or predetermined warning times that do not adapt to the dynamic relative movement situation between the vehicle and the obstacle, potentially leading to inadequate driver intervention time in changing traffic scenarios.
Innovation Solution
The system dynamically adjusts the warning time based on the relative movement situation between the vehicle and the obstacle, shortening it if the obstacle slows down and extending it if it accelerates, ensuring the warning time is optimized for the current traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed warning time is used in automatic emergency brake systems, then the system structure is simple and easy to implement, but the system cannot adapt to dynamic traffic situations, potentially leading to inadequate driver intervention time
Solution Approach 1:
The warning time is transformed from a fixed value to a dynamic variable that automatically adjusts based on real-time relative movement between the vehicle and obstacle. The system continuously monitors relative speed and distance, and modifies the warning time duration accordingly - extending it when the obstacle accelerates and shortening it when the obstacle decelerates, ensuring optimal driver intervention time for each traffic scenario
Solution Approach 2:
The system implements a feedback mechanism where sensor data about the obstacle's movement (acceleration/deceleration) is continuously fed back to the control unit. This feedback loop enables the system to automatically adjust the warning time in real-time based on the actual traffic situation, creating a closed-loop control system that adapts to changing conditions
2Reliability
If the warning time is extended to give drivers more intervention time, then driver safety is improved, but the response time for actual emergency situations is reduced
Solution Approach 1:
The warning time duration is dynamically adjusted based on the obstacle's acceleration behavior. When the obstacle accelerates (indicating a more severe threat), the system extends the warning time to provide adequate driver intervention time. When the obstacle decelerates (indicating a less severe situation), the system shortens the warning time, thereby preserving response time for actual emergencies. This dynamic adjustment ensures both driver safety and efficient emergency response
Data Source
Figure 1~2
AI summary
The invention relates to a method for triggering an automatic emergency braking process in a vehicle for avoiding a tail-end collision with an obstacle, wherein a warning to the driver is triggered if at least one warning condition is satisfied, wherein the satisfaction of the warning condition specifies that owing to the instantaneous driving situation of the vehicle relative to the obstacle the automatic emergency braking process should be triggered, wherein the automatic emergency braking process is not triggered until after the warning to the driver is triggered and a warning time period (tWarning) has subsequently expired. The invention provides that the warning time period (tWarning) is set as a function of the relative movement situation between the vehicle and the obstacle and/or is adapted as a function of a relative movement situation between the vehicle and the obstacle which changes over time.