Wireless Lock Switching Using Door Position Feedback
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Solution Overview
Problem
Existing wireless access control systems often inadvertently lock doors when users pass proximity to the lock while the door is open, leading to inconvenience and potential security breaches.
Innovation Solution
A wireless access control system with a lock assembly that includes directional antennas, a touch sensor, and a controller that only locks the door when it is fully closed and the user is inside, using a remote access device to manage locking states based on door position and user proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock switches to locked position when the remote device is detected in proximity, then security is improved, but accidental locking occurs when the door is open causing inconvenience and potential security breaches
Solution Approach 1:
The system continuously monitors door position sensor feedback to determine whether the door is closed before executing the locking action. The controller only switches the lock to the locked position when both conditions are met: remote device is in proximity AND door position sensor confirms the door is closed. This feedback mechanism prevents accidental locking when the door is open while maintaining security when the door is properly closed.
Solution Approach 2:
The system performs a preliminary check of the door position sensor state before executing the locking action. By checking whether the door is closed prior to locking, the system ensures that the locking operation only occurs under appropriate conditions, preventing premature or incorrect locking that would compromise both convenience and security.
2Reliability
If the lock locks automatically when the remote device is in the interior area, then security is enhanced, but the lock may lock while the door is open creating safety hazards
Solution Approach 1:
The door position sensor provides continuous feedback to the controller about the door's state. The controller uses this feedback to determine whether it is safe to execute the locking action. Only when the door position sensor confirms the door is closed does the controller proceed to lock the lock, thereby eliminating the safety hazard of locking an open door while maintaining security enhancement.
Solution Approach 2:
The system applies preliminary anti-action by preventing the locking action from occurring when the door is open. The controller actively blocks the locking command when the door position sensor indicates the door is not closed, counteracting the potential harmful effect of locking an open door before it can occur.
Data Source
AI summary
A wireless access control system may include a remote access wireless communications device and a lock assembly. The lock assembly may include a lock switchable between locked and unlocked positions, a door position sensor, interior and exterior directional antennas, lock wireless communications circuitry coupled to the interior and exterior directional antennas, a touch sensor, and a lock controller. The lock controller may unlock the lock based upon the touch sensor, determine when the door is closed after being opened based upon the door position sensor, and determine whether the remote access wireless device is in an interior or an exterior area based upon directional antennas. The lock controller may also switch the lock to the locked position when the door is closed and when the remote access wireless device is in the interior area, and not switch the lock to the locked position when the door is open.