Vehicle Impact Detection via Acceleration Variation Rate Analysis
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Solution Overview
Problem
Existing impact detection systems for vehicles struggle to accurately differentiate between impacts and other causes of acceleration, such as wind, earthquakes, or mechanical parking lot movements, leading to potential erroneous detection.
Innovation Solution
The proposed impact detection apparatus includes a storage circuit to log acceleration data over time and a determination circuit that analyzes the variation rate of acceleration within a predetermined period to determine if an impact has occurred. The apparatus also adjusts an acceleration threshold based on vehicle velocity to improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed acceleration threshold is used for impact detection, then the detection system is simple to operate, but detection accuracy deteriorates due to false positives from non-impact causes
Solution Approach 1:
The patent implements dynamic threshold adjustment by continuously monitoring acceleration variation rates and adapting the threshold accordingly. When high variation rates are detected (indicating potential impact), the threshold is lowered to increase sensitivity. When low variation rates are detected (normal conditions), the threshold is raised to reduce false positives. This dynamic adaptation resolves the contradiction by making the system both accurate and context-aware without requiring overly complex fixed-rule logic.
Solution Approach 2:
The patent changes the acceleration threshold parameter based on the variation rate of acceleration over time. By modifying this key parameter dynamically rather than keeping it fixed, the system achieves high detection accuracy across different operating conditions while maintaining reasonable system complexity through a single adaptable parameter.
2Measurement precision
If the acceleration threshold is adjusted dynamically based on variation rate, then detection accuracy is improved, but the computational complexity increases
Solution Approach 1:
The patent applies partial action by focusing computational resources only on calculating the variation rate of acceleration, rather than analyzing all possible motion parameters. This selective approach achieves high detection accuracy through targeted analysis of the most relevant feature (acceleration change rate) while keeping computational complexity manageable by ignoring less relevant factors.
3Reliability
If a high acceleration threshold is used to reduce false positives, then false detection rate decreases, but legitimate impact detection capability deteriorates
Solution Approach 1:
The patent uses dynamic threshold adjustment to resolve this contradiction. During normal operation with low acceleration variation rates, a high threshold is maintained to reduce false positives. When an impact occurs and acceleration variation rate increases, the threshold automatically lowers to capture legitimate impacts. This dynamic behavior ensures both high reliability during normal conditions and high detection capability during impact events.
Solution Approach 2:
The patent prepares for potential impacts by continuously monitoring acceleration variation rates and pre-adjusting the threshold before an impact occurs. When high variation rates are detected, the system proactively lowers the threshold in advance, ensuring that legitimate impacts are not missed while maintaining high thresholds during normal operation to prevent false positives.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables high-accuracy detection of impacts on vehicles while minimizing false positives from non-impact causes, thereby enhancing the reliability of impact detection systems.
Implementation Method 1
an acceleration sensor that detects an acceleration generated in the vehicle
Data Source
AI summary
An impact detection apparatus of the present disclosure includes: a storage circuit that stores a velocity and an acceleration of a vehicle in association with an elapse of time; and a determination circuit that determines whether an impact is applied to the vehicle at each timing in a predetermined period based on a variation rate of the acceleration in the predetermined period.