Smart Door Lock Transmission Mechanism for Peephole Attack Prevention
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Solution Overview
Problem
Traditional door locks can be unlocked abnormally from outside, posing a security risk to occupants, as criminals can manipulate the door handle from outside through a peephole.
Innovation Solution
A smart door lock system that includes a sensing unit, a controller, and a transmission mechanism, where the sensing unit detects user presence through pressure and capacitance sensors, and the controller controls the transmission mechanism to switch between openable and unopenable states based on the sensing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door lock uses a traditional transmission connection between operation part and action part, then the door can be easily opened from inside, but the door can be abnormally unlocked from outside through peephole manipulation
Solution Approach 1:
The transmission connection is designed to dynamically switch between connected and blocked states based on sensing signals. When a valid operation is detected (e.g., correct password, fingerprint), the transmission connection is established allowing the operation part to drive the action part. When no valid operation is detected or abnormal manipulation is suspected, the transmission connection is blocked, preventing any mechanical transmission from the operation part to the action part, thus securing against peephole attacks while maintaining ease of legitimate operation.
Solution Approach 2:
A control mechanism acts as an intermediary between the operation part and action part, managing the transmission connection. This intermediary receives sensing signals from various sensors (password input, fingerprint sensor, etc.) and decides whether to establish or block the transmission connection. The intermediary ensures that only authenticated operations can transmit mechanical force to unlock the bolt, while blocking all other attempts including peephole manipulation.
2Reliability
If the transmission connection is always blocked to prevent unauthorized opening, then security is improved, but the door cannot be opened when needed
Solution Approach 1:
The system incorporates multiple sensing units that provide feedback about user identity and operation intent. When a user presents valid credentials (password, fingerprint, facial recognition), the sensing units send feedback signals to the control mechanism, which then switches the transmission connection from blocked to connected state. This feedback mechanism ensures the door remains secure (transmission blocked) until legitimate authentication occurs, at which point it becomes adaptable and allows opening.
Solution Approach 2:
The transmission connection's state parameter is dynamically changed based on authentication parameters. The system monitors multiple parameters including password correctness, fingerprint match quality, facial recognition accuracy. When these parameters meet the required thresholds, the transmission connection parameter switches from 'blocked' to 'connected', enabling door opening. This parameter-based control provides both security (maintaining blocked state) and adaptability (switching to connected state when conditions are met).
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 prevents unauthorized unlocking from outside by ensuring the door can only be opened from inside when a valid user interaction is detected, enhancing the security and convenience of smart door locks.
Implementation Method 1
The sensing unit may include a pressure sensing unit
Implementation Method 2
The sensing unit may include a capacitance sensor
Data Source
AI summary
The present disclosure provides a lock and a method and a system for controlling the lock. The lock may include an operation part, an action part, and a bolt. The action part may be configured to drive the bolt to move. The operation part and the action part may be connected to each other via a transmission connection. The transmission connection may be blockable.