Garage Door Panel Position Detection Using Pressure and Acceleration
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Solution Overview
Problem
Current methods for determining the position of an overhead garage door, such as end limit switches, tilt switches, and accelerometers, are inadequate in accurately identifying open, closed, or partially open states, especially for segmented doors, due to limitations in sensing small changes in altitude and distinguishing them from environmental factors like wind and atmospheric conditions.
Innovation Solution
A device comprising an accelerometer, an atmospheric pressure sensor, and a processor that measures ambient pressure and detects motion to determine the state of a garage door panel, using calibration inputs to compute vertical displacement and communicate the position to a garage door system, thereby accurately identifying open, closed, or partially open states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If atmospheric pressure sensor is used to measure altitude changes, then measurement capability is improved, but reliability deteriorates due to interference from wind and atmospheric conditions
Solution Approach 1:
The patent uses an accelerometer as an intermediary device to detect motion and trigger pressure measurements only during actual door movement. This mediates between the pressure sensor and environmental interference by establishing a causal link between detected motion and measurement timing, ensuring measurements are taken only when relevant to door position changes.
Solution Approach 2:
The system performs preliminary action by using the accelerometer to detect motion before triggering the atmospheric pressure sensor. This preliminary detection ensures that pressure measurements are only initiated when door movement is actually occurring, preventing wasted measurements during static conditions and reducing susceptibility to environmental noise.
2Measurement precision
If accelerometer is placed on bottom panel to detect full opening, then ability to detect large changes is improved, but sensitivity to small changes deteriorates
Solution Approach 1:
The patent transitions from spatial positioning (where panel placement determines measurement capability) to temporal dimension (when measurements are taken). By using the accelerometer to detect motion events and triggering pressure measurements at those moments, the system achieves comprehensive position detection regardless of panel location, effectively adding a temporal dimension to the measurement process.
3Reliability
If limit switches are used to determine door position, then closed/open state detection is improved, but ability to detect partial open states deteriorates
Solution Approach 1:
The patent replaces the mechanical limit switch system with a combination of accelerometer and atmospheric pressure sensor. This substitution transitions from discrete mechanical end-stop detection to continuous environmental parameter measurement, enabling precise determination of partial door positions through pressure differential measurements while retaining the reliability of motion detection through acceleration sensing.
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 provides precise determination of the garage door's position, including height, by correlating pressure differentials with vertical displacement, effectively overcoming previous limitations and enhancing garage door control systems.
Implementation Method 1
an atmospheric pressure sensor configured to trigger a measurement of an ambient atmospheric pressure in response to the detected motion of the panel
Implementation Method 2
an accelerometer configured to be attached to the panel and to detect a motion of the panel
Data Source
AI summary
A device for measuring a position of a panel of an overhead garage door is described. The device has an accelerometer, an atmospheric pressure sensor, and a processor. The accelerometer is attached to the panel and detects a motion or vibration of the panel. The atmospheric pressure sensor triggers a measurement of an ambient atmospheric pressure in response to the detected motion of the panel. A state of the panel is determined based on a combination of the measured ambient atmospheric pressure and the detected motion of the panel.