Smart Door Lock Tamper Detection for Grade 2 Security
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Solution Overview
Problem
Existing smart locks do not meet the security requirements of EN 50131 Grade 2, making them unsuitable for integration into advanced security monitoring systems.
Innovation Solution
An electronically controlled lock equipped with a processor, lock RF transceiver, magnetometers, and an accelerometer, which functions as a shock detector to generate tamper signals and alert signals, ensuring compliance with EN 50131 Grade 2 standards by detecting attempts to pick or interfere with the lock, and distinguishing between genuine attacks and false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If smart locks are integrated into premises security monitoring systems, then user convenience is improved, but security compliance deteriorates because most smart locks do not satisfy EN50131 Grade 2 requirements
Solution Approach 1:
The patent combines a smart lock with shock detection functionality and tamper detection capabilities into a single integrated device. The lock incorporates an accelerometer to detect shocks and vibrations, magnetometers to detect magnetic field changes, and a processor to analyze these signals for tamper detection, merging remote control convenience with Grade 2 security compliance in one unit.
Solution Approach 2:
The lock serves multiple functions simultaneously: it provides remote locking/unlocking control, monitors for tamper attempts through shock and magnetic field detection, generates alarm signals when threats are detected, and communicates with both local and remote monitoring systems. This multi-functionality allows a single device to satisfy both user convenience and security compliance requirements.
2Reliability
If shock sensors are added to detect tamper attempts, then security detection capability is improved, but false alarms increase due to inability to distinguish genuine attacks from normal activity
Solution Approach 1:
The processor continuously monitors shock and vibration signals from the accelerometer, comparing them against predefined thresholds and patterns. When abnormal shock patterns are detected that exceed normal operational variations, the system generates tamper detection alerts. This feedback mechanism allows the system to adapt to normal activity while remaining sensitive to genuine threats.
Solution Approach 2:
The system uses multiple sensors (accelerometer for shock/vibration, magnetometers for magnetic field changes) to detect different physical parameters associated with tamper attempts. By monitoring multiple parameters simultaneously and analyzing their patterns, the system can distinguish between genuine security threats and normal environmental variations, reducing false alarms while maintaining high detection capability.
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 lock provides enhanced security by meeting Grade 2 standards, allowing integration into advanced security monitoring systems and reducing false alarms through differentiated signal transmission based on sensor type and nature of the attack.
Implementation Method 1
an accelerometer; wherein: the accelerometer is configured to operate as a shock sensor, the processor and the accelerometer together functioning as a shock detector to generate a tamper signal
Implementation Method 2
one or more magnetometers; at least one of the one or more magnetometers being configured to detect the presence of one or more door magnets located outside the lock but within or attached to the door
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
An electronically controlled lock for a door of premises, the lock comprising a processor and coupled to the processor: a lock RF transceiver; one or more magnetometers.