Vehicle Emergency Braking Detection Using Dynamic Evaluation Methods
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Solution Overview
Problem
Conventional methods for detecting emergency braking situations in vehicles are often limited to specific driving scenarios and may trigger braking too early, leading to unnecessary interventions and potential hazards.
Innovation Solution
A method using two evaluation approaches - equation of motion evaluation and braking distance evaluation - to assess emergency braking situations, with criteria determining the appropriate method based on the driving scenario, ensuring accurate detection of potential collisions and minimizing false triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-method emergency braking detection is used, then the system is simple to implement, but it triggers braking too early or too late leading to unnecessary interventions or missed collisions
Solution Approach 1:
The evaluation system is segmented into two independent methods: equation of motion evaluation and braking distance evaluation. Each method processes the same input parameters (relative distance, relative speed, accelerations) through different computational approaches. The system selects one method based on current driving conditions, ensuring accurate detection without requiring both methods to run simultaneously, thus maintaining reliability while controlling complexity.
Solution Approach 2:
The system dynamically selects between two evaluation methods based on real-time driving conditions. The selection criterion depends on the object's acceleration and relative speed, allowing the system to adapt its evaluation approach to the current situation. This dynamic adaptation ensures optimal detection accuracy for varying driving scenarios without requiring a permanently complex system architecture.
2Measurement precision
If equation of motion evaluation method is used alone, then it provides accurate collision time prediction, but it may trigger unauthorized braking in certain scenarios
Solution Approach 1:
The system introduces a selection criterion as an intermediary between the equation of motion evaluation and the final braking decision. This criterion evaluates whether the object's acceleration and relative speed conditions are suitable for equation of motion analysis. When conditions are unsuitable, the system switches to braking distance evaluation, preventing unauthorized braking while preserving the precision benefits of equation of motion evaluation when appropriate.
3Object-affected harmful factors
If braking distance evaluation is used alone, then it avoids false triggers, but it may not detect emergency situations timely in all scenarios
Solution Approach 1:
The system performs preliminary evaluation of the driving scenario using selection criteria based on object acceleration and relative speed before committing to a specific evaluation method. This preliminary assessment ensures that the most appropriate method is chosen in advance, preventing both false triggers and delayed responses. The criteria are pre-established based on theoretical analysis of when each method is most effective.
Data Source
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AI summary
The invention relates to a method for determining an emergency braking situation of a vehicle (1), in which the vehicle (1) determines at least the following state variables: its own velocity (vi), its own longitudinal acceleration (a1), its relative distance (dx) from an object (2) in front, and a second speed (v2) and second acceleration (a2) of the object (2) in front, wherein by means of an evaluation method it is determined from the state variables (vi, a1, dx, v2, a2) whether an emergency braking situation is present. According to the invention there is provision that various evaluation methods are used as a function of the state variables (vi, a1, dx, v2, a2) to assess whether an emergency braking situation is present, wherein as a function of the state variables it is determined which of the plurality of evaluation methods is used, wherein the various evaluation methods comprise at least the following evaluation methods: a movement equation evaluation method in which a movement equation system of the vehicle (1) and of the object (2) in front is determined, and a second evaluation method in which a braking distance of the vehicle (1) is determined.