Vehicle Impact Detection Using Adaptive Collision-Form Thresholds
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Solution Overview
Problem
Conventional impact determination devices rely solely on comparing acceleration thresholds with detection values to determine collision forms, lacking consideration for the actual impact form, leading to potential inaccuracies in impact detection.
Innovation Solution
An impact determination device that incorporates an acceleration sensor for detecting front-rear and left-right vehicle directions, an external sensor for object detection, and a threshold setting unit that adjusts acceleration thresholds based on the impact form recognized by the external sensor, allowing for more accurate impact determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the threshold is set based only on acceleration sensor detection results, then the device complexity is reduced, but the measurement precision of impact determination deteriorates
Solution Approach 1:
The patent combines multiple sensor types (acceleration sensor, angular velocity sensor, and external sensor) into an integrated sensor system that works together to determine impact form. The threshold setting unit merges data from these different sensors to set appropriate thresholds, achieving higher measurement precision through multi-sensor fusion rather than relying on a single sensor type.
Solution Approach 2:
The threshold setting unit acts as an intermediary that processes information from multiple sensors and translates it into appropriate determination thresholds. It mediates between the raw sensor data and the final impact determination, using external sensor information about objects in the periphery to adjust thresholds dynamically based on the detected impact form.
2Reliability
If conventional acceleration-only threshold comparison is used, then the ease of operation is maintained, but the reliability of impact determination deteriorates
Solution Approach 1:
The system performs preliminary detection using external sensors to identify objects in the periphery and predict potential impact forms before the actual impact occurs. This preliminary action allows the threshold setting unit to pre-adjust thresholds based on the detected impact form, making the subsequent impact determination more reliable without requiring complex real-time analysis during the impact event itself.
Solution Approach 2:
The threshold setting unit dynamically adjusts determination thresholds based on the impact form detected by external sensors. Instead of using fixed thresholds, the system changes thresholds in real-time according to the detected object and predicted impact type, thereby improving reliability while maintaining operational simplicity through automated adaptive adjustment.
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
The device enhances the accuracy of impact detection by setting thresholds tailored to the specific impact form, reducing false positives and improving the reliability of collision recognition.
Implementation Method 1
an acceleration sensor that detects an acceleration including each component in a front-rear direction and a left-right direction of a vehicle
Data Source
AI summary
The impact determination device includes an internal sensor including an acceleration sensor that detects an acceleration including components in the front-rear direction and the left-right direction of the host vehicle, an external sensor that detects an object around the host vehicle, a threshold setting unit that sets a threshold for determining an impact caused by an object on the host vehicle, and an impact determination unit that determines an impact when the acceleration of each of the components is equal to or greater than the threshold. The threshold setting unit recognizes an impact form of the object with respect to the host vehicle based on a detection result of the external sensor, and sets a threshold for each component of the acceleration in accordance with the impact form.