Door Lock Sensor with Accelerometer for Forced Entry Detection
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Solution Overview
Problem
Existing electronic door lock systems face challenges in accurately distinguishing between normal door closures and attempted forced entries, often resulting in false alarms and inadequate security measures.
Innovation Solution
A door lock and sensor combination utilizing a multi-axis accelerometer to measure acceleration in multiple directions, with a controller analyzing these signals to differentiate between normal closures and forced entries, and communicating security information to a remote station via a communication link.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple door lock system is used, then the device complexity is low, but the measurement precision of door movement detection is insufficient leading to false alarms
Solution Approach 1:
The door lock system is segmented into distinct functional modules: a simple single-axis accelerometer for basic motion detection, a separate controller for signal analysis, and a communication module for alerts. This segmentation allows the sensor itself to remain simple while achieving high detection precision through sophisticated signal processing in the controller.
Solution Approach 2:
The controller acts as an intermediary between the simple accelerometer sensor and the alarm system. It processes the raw acceleration signals, distinguishes between normal door closures and forced entries based on signal patterns, and only triggers alarms when forced entry is detected. This intermediary processing resolves the contradiction by adding intelligence without complicating the sensor hardware.
2Measurement precision
If a multi-axis accelerometer is used to improve detection accuracy, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The system uses a single-axis accelerometer (partial action) rather than a full multi-axis accelerometer (excessive action). The single axis is oriented to detect the specific direction of forced entry attempts, providing sufficient detection precision without the added complexity of multiple axes. This partial measurement approach resolves the contradiction by using only the necessary sensing capability.
Solution Approach 2:
The system changes the parameter of measurement precision not by increasing sensor complexity (multi-axis accelerometer) but by optimizing the signal processing parameters in the controller. The controller analyzes acceleration patterns, thresholds, and temporal characteristics to achieve high detection accuracy with a simpler single-axis sensor, thereby resolving the contradiction through parameter optimization rather than hardware escalation.
3Reliability
If alarm functionality is added to the door lock, then the security capability is improved, but the device complexity increases
Solution Approach 1:
The alarm functionality is merged with the existing door lock controller rather than being implemented as a separate alarm system. The same controller that processes accelerometer data and determines forced entry also triggers the alarm function, consolidating multiple security functions into a single integrated unit. This merging reduces overall system complexity while maintaining reliable security functionality.
Solution Approach 2:
The door lock controller is designed with multi-functionality, serving both as the primary lock control unit and as the alarm system controller. It universally handles multiple tasks: monitoring door status, processing authentication, analyzing accelerometer signals, and triggering alarms. This universal design eliminates the need for separate dedicated alarm hardware, reducing complexity while improving security reliability.
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 system effectively reduces false alarms by accurately identifying attempted forced entries and provides enhanced security through precise monitoring of door movements and status, enabling timely alerts and improved security protocols.
Implementation Method 1
A door lock and sensor combination includes an accelerometer, a housing, and a circuit board positioned in the housing
Data Source
AI summary
A door lock mechanism is disclosed that includes door lock and alarm features. The mechanism includes a controller and a sensor useful to detect motions that are representative of attempted access through a door to which the door lock mechanism is attached. The controller can set an alarm condition if a measured motion, such as a measured acceleration, meet and/or exceeds a threshold. If an appropriate access control credential is provided through a user device then the alarm condition may not be set by the controller. The door lock mechanism can be coupled to a remote station via a communications link if needed, such as a radio frequency link. The remote station can additionally be in communication with the door lock mechanism via a network. The remote station can be used to send and receive messages regarding door lock mechanism status, configuration, etc.