Door Motion Sensing on Moveable Platforms Under Orientation Noise
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Solution Overview
Problem
Existing systems face challenges in accurately determining the open/close status of doors on moveable platforms, such as containers, due to orientation changes and noise in sensor data, which can lead to incorrect status reporting and increased costs from wiring and potential damage.
Innovation Solution
A sensor device mounted on the door, equipped with an accelerometer and gyroscope, uses a combination of infinite impulse response (IIR) filters and selective filter usage to process data, considering orientation and noise reduction, to reliably determine the door's status, even when the platform is in motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensor systems are used to determine door status on moveable platforms, then wiring and installation costs increase, but measurement precision and reliability improve
Solution Approach 1:
The patent replaces traditional mechanical wiring-based sensor systems with a wireless sensor device that uses inertial measurement units (accelerometer and gyroscope) to detect door status. This substitution eliminates the need for complex wiring while maintaining detection accuracy through advanced signal processing algorithms that filter noise and distinguish true door movements from platform movements.
2Productivity
If sensor data is continuously monitored without filtering, then responsiveness to door status changes improves, but false reports increase due to noise
Solution Approach 1:
The patent applies filtering algorithms as a preliminary action to sensor data before analysis. The system pre-processes accelerometer and gyroscope data by applying low-pass filters and other signal processing techniques to remove noise and vibrations, ensuring that subsequent door status detection is based on cleaned, reliable data that reduces false positives while maintaining responsiveness.
Solution Approach 2:
The system implements feedback mechanisms where the processed sensor data continuously informs the door status determination algorithm. By feeding back filtered acceleration and orientation data along with previously determined door statuses, the system can distinguish between genuine door movements and platform movements, reducing false reports while maintaining rapid response to actual door status changes.
3Measurement precision
If the sensor device operates at full precision continuously, then measurement accuracy improves, but energy consumption increases
Solution Approach 1:
The patent implements periodic sampling of sensor data rather than continuous high-precision monitoring. The accelerometer and gyroscope operate at optimized sampling rates that capture essential door movement information while consuming less power. The system periodically processes data through filtering algorithms only when motion thresholds are exceeded, reducing energy consumption while maintaining measurement precision for actual door events.
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 a robust and responsive method for accurately detecting door status, reducing false reports and maintaining reliability across varying orientations and environmental conditions, while minimizing hardware and installation costs.
Implementation Method 1
A sensor device mounted on the door, equipped with an accelerometer and gyroscope
Implementation Method 2
A sensor device mounted on the door, equipped with an accelerometer and gyroscope
Data Source
AI summary
In some examples, to perform motion detection of a moveable platform, variance values based on acceleration data from an accelerometer on the moveable platform are computed. Using the computed variance values, it is determined whether the moveable platform is in motion.