Pivotable Barrier Status Detection Using Multi-Filter Sensor Fusion
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Solution Overview
Problem
Existing systems face challenges in accurately determining the open/close status of a door on a moveable platform, especially when the platform is subjected to varying orientations due to movement, and current solutions involve costly wiring and are prone to damage from rough handling.
Innovation Solution
A sensor device mounted on the door, equipped with an accelerometer and rotation sensor, uses gyroscope data to determine the door's orientation and status, employing infinite impulse response filters to process noisy measurement data and selectively using short and long filters to ensure fast and reliable detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring is used to connect sensors to the door status detection system, then the system can detect door status, but the wiring is costly and prone to damage from rough handling
Solution Approach 1:
The patent replaces the mechanical wiring system with a wireless sensor system. Sensors (accelerometer, rotation sensor, gyroscope) are mounted directly on the door and communicate wirelessly with the detection system, eliminating physical wiring that is costly and prone to damage from rough handling while maintaining reliable door status detection
Solution Approach 2:
The sensor system is self-contained and mounted directly on the door, requiring no external wiring connections. The sensors autonomously detect door status and transmit data wirelessly, making the system independent of complex wiring infrastructure and resistant to damage from rough handling
2Measurement precision
If traditional sensor systems are used without filtering, then the system is simpler, but measurement data is noisy and inaccurate due to platform movement and varying orientations
Solution Approach 1:
The patent applies filtering operations preliminarily to the raw measurement data from sensors before processing. Infinite impulse response filters are used to pre-process the noisy acceleration and rotation data, removing noise caused by platform movement and varying orientations before the data is used for door status determination
Solution Approach 2:
The patent introduces filtering algorithms as intermediary processing steps between the raw sensor measurements and the final door status determination. The filters act as mediators that transform noisy raw data into clean, reliable measurement data, improving precision without requiring changes to the physical sensor hardware
3Reliability
If a single filter is used to process sensor data, then the processing is faster, but the detection is less reliable under varying environmental conditions
Solution Approach 1:
The patent segments the filtering process into multiple independent filter operations applied sequentially to the sensor data. Instead of using a single complex filter, multiple filters process different aspects of the noisy measurement data, with each filter targeting specific noise characteristics, thereby improving overall detection reliability while maintaining efficient processing
Solution Approach 2:
The patent applies filtering beyond what a single filter could achieve by using multiple filters in sequence. This excessive filtering action ensures that all types of noise and environmental variations are addressed, providing robust and reliable door status detection across varying environmental conditions
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 solution provides robust and accurate detection of door status irrespective of platform orientation, reducing false events and adapting to varying environmental conditions, while minimizing hardware costs and vulnerability to damage.
Implementation Method 1
A sensor device mounted on the door, equipped with an accelerometer and rotation sensor
Implementation Method 2
uses gyroscope data to determine the door's orientation and status
Data Source
Figure 1A~1B
Figure 2
Figure 3A
AI summary
In some examples, a method determines an open/close status of a pivotable barrier on a moveable platform based on selective use of a plurality of different filters for filtering measurement data from a sensor device.