Door Panel Sensing Module Using Bolt Magnetic Field Detection
Solution Overview
Problem
Conventional door panel sensing modules are troublesome to install and can be easily tampered with by thieves, as they require precise alignment and are visible, making them vulnerable to false signals being generated by additional magnets.
Innovation Solution
A sensing module integrated into the door frame cavity, comprising an antenna, sensing unit, processing unit, radio frequency transceiving unit, and filtering unit, which detects variations in the magnetic field of a bolt to determine the door's position and outputs radio frequency signals, eliminating the need for a separate magnet and simplifying installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnet and sensing unit are mounted on the exterior of the door panel and door frame, then the sensing module can detect door position, but the installation becomes troublesome due to alignment requirements and the module becomes vulnerable to tampering
Solution Approach 1:
The sensing unit is integrated into the door frame structure itself, merging the sensing function with the existing structural component. This eliminates the need for separate magnet and sensing unit mounting, thereby simplifying installation while maintaining sensing capability through detection of the bolt's magnetic field variations
Solution Approach 2:
The patent uses the metal bolt as an intermediary object that carries magnetic field information. Instead of directly detecting door position through aligned magnets, the sensing unit detects magnetic field variations caused by the bolt's position, which indirectly indicates door state while eliminating alignment requirements
2Reliability
If a magnet is mounted on the exterior of the door panel, then the sensing unit can detect door position, but the module becomes vulnerable to tampering by thieves installing additional magnets
Solution Approach 1:
The patent converts the potentially harmful effect of external magnets into a beneficial detection mechanism. By detecting magnetic field variations caused by the bolt's position and comparing them against predetermined thresholds, the system can identify legitimate magnetic field changes (from the bolt) while rejecting fraudulent ones (from external magnets), thus turning magnetic interference into a useful signaling mechanism
Solution Approach 2:
The sensing unit continuously monitors magnetic field variations and provides feedback to the control unit. The control unit compares the detected magnetic field strength against predetermined reference values and adjusts its interpretation accordingly, enabling the system to distinguish between legitimate bolt position changes and fraudulent external magnet interference through continuous feedback and comparison
3Measurement precision
If the sensing unit continuously monitors magnetic field, then accurate door position detection is achieved, but energy consumption increases
Solution Approach 1:
The sensing unit operates in periodic cycles rather than continuously. The control unit activates the sensing unit only when needed (such as when the door is expected to be operated or at scheduled intervals), allowing the system to maintain detection accuracy when required while significantly reducing energy consumption during idle periods
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 reduces installation complexity, enhances security by hiding the sensing module's location, and prevents tampering, while accurately determining the door's position without the need for a magnet, thus improving reliability and aesthetics.
Implementation Method 1
The sensing unit is to be activated to detect a variation in magnetic field attributed to the bolt
Data Source
AI summary
A sensing module for sensing a position of a door panel includes a sensing unit, a processing unit, and a radio frequency transceiving unit. The sensing unit is disposed in a cavity for receiving a bolt of the door panel, detects a variation in magnetic field attributed to the bolt, and outputs a sensing signal indicating the variation in magnetic field detected thereby. The processing unit is electrically connected to the sensing unit to receive the sensing signal from the sensing unit, determines whether the position of the door panel is an open position or a closed position based on the variation in magnetic field and predetermined magnetic field information, and generates an informing signal indicating the position of the door panel.