Door Lock Verification Using Motion Sensor and RFID
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Solution Overview
Problem
Door arrangements with motor-driven extendable bolts face issues where the bolt extends when the door is open, preventing closure and compromising security, as existing solutions like additional door contacts are not foolproof against manipulation.
Innovation Solution
A door arrangement with a reading unit and motion sensor that verify the closed position by comparing signals, ensuring the bolt is retracted or not extended if the door is not fully closed, using a wireless communication system between the reading unit and identification carrier, and integrating evaluation electronics to prevent unauthorized operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a motor-driven extendable bolt is used for door locking, then the door can be securely locked, but the bolt may extend when the door is open causing it to hit the door frame and preventing proper closure
Solution Approach 1:
The system performs preliminary verification of the door closed position using multiple sensors (door contact, reading unit detecting identification carrier, motion sensor) before allowing the bolt to extend. This preliminary check prevents the bolt from extending when the door is actually open, resolving the contradiction by ensuring secure locking only when proper closure is confirmed through redundant detection methods.
2Reliability
If additional door contacts are added to detect manipulation, then manipulation detection capability is improved, but the system becomes more complex and costly
Solution Approach 1:
The reading unit serves multiple functions: it detects the closed position of the door, verifies the presence of the identification carrier, and can detect manipulation attempts. By making the reading unit multi-functional, the system achieves improved manipulation detection without adding separate dedicated sensors, thus resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The system combines multiple detection functions (door position detection, identification verification, motion detection) into a unified evaluation electronics unit that processes signals from various sensors. This merging of functions into a single integrated system reduces overall complexity while maintaining high manipulation detection capability.
3Reliability
If the bolt is extended when the door is open, then the door can be locked, but the extended bolt hits the door frame preventing the door from being closed
Solution Approach 1:
The evaluation electronics perform preliminary verification of door closure status using redundant sensors before allowing the bolt extension command to execute. This preliminary anti-action prevents the harmful effect of the bolt hitting the door frame by ensuring the door is properly closed before locking, thus resolving the contradiction between locking reliability and installation ease.
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
Enhances security by reliably detecting the closed position, preventing the bolt from hitting the door frame and ensuring the door can be closed safely and securely, while simplifying installation and maintenance with a passive identification carrier and modular design.
Implementation Method 1
a reading unit (50) for an electronic identification carrier (48) arranged on or in the door leaf (14), wherein the reading unit (50) and the identification carrier (48) are arranged (to one another) in such a way that the identification carrier (48) is in the reading range of the reading unit (50) when the door leaf (14) is closed
Implementation Method 2
a movement sensor (52) for detecting a movement of the door leaf (14)
Data Source
Figure 1
Figure 2
AI summary
A door assembly (10) comprising a door frame (12), a door leaf (14) pivotable relative to the door frame (12), and an electronic lock (22) arranged on or in the door leaf (14) with a motor-operated bolt (34) for locking the door leaf (14) to the door frame (12), is designed and further developed with a view to increasing safety and reliability in operation with simple design means in a door assembly such that an electronic identification carrier (48) is arranged on or in the door frame (12), that the lock (22) has a reading unit (50) for the electronic identification carrier (48), wherein the reading unit (50) has a motion sensor (52) that detects a movement of the door leaf (14), and that the lock (22) has evaluation electronics (54) for verifying the closed position of the door leaf (14).wherein the reading unit (50) and the motion sensor (52) are electrically and/or electronically coupled to the evaluation electronics (54). A method for operating a door arrangement (10) is specified.