Wireless Lock Proximity Detection and Power Management
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Solution Overview
Problem
Current radio frequency passive keyless entry systems for residential locks face challenges in simplicity, speed, distance measurement, battery life, and convenience, including delayed authentication, proximity accuracy, and power consumption.
Innovation Solution
A wireless access control system that includes a remote access device with a controller and radio signal generator, powered by a battery, utilizing an accelerometer for acceleration signals and an authentication circuit for encryption, along with a proximity detector to enable secure and efficient access control, potentially using a Smartphone and a Router Plug-in Unit for connectivity and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the lock continuously monitors for authorized tokens to enable fast authentication, then authentication speed is improved, but power consumption increases
Solution Approach 1:
The lock performs periodic monitoring at intervals rather than continuous monitoring, reducing power consumption while maintaining acceptable authentication speed. The system alternates between active monitoring phases and low-power sleep phases, enabling fast authentication when needed while conserving battery energy during idle periods.
2Ease of operation
If the lock extends monitoring range to detect users at a distance, then convenience is improved, but power consumption and signal interference increase
Solution Approach 1:
The lock performs preliminary detection at longer ranges using lower-power signals to identify potential authorized users before initiating full authentication. This preliminary action allows the system to extend monitoring range for convenience while managing power consumption by only activating full monitoring when a potential user is detected.
3Ease of operation
If the lock requires minimal user interaction for access, then simplicity is improved, but security against unauthorized access decreases
Solution Approach 1:
The system introduces an intermediary verification mechanism that automatically validates user identity through multiple factors (token authentication, proximity detection, biometric verification) before granting access. This intermediary layer maintains simplicity for authorized users while enhancing security by verifying identity through multiple channels without requiring additional user actions.
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 provides fast and secure access control with minimal user interaction, extended battery life, and improved convenience by optimizing authentication speed, proximity detection, and power conservation, while ensuring authorized access and preventing unauthorized entry.
Implementation Method 1
An accelerometer provides an acceleration signal to the controller in response to sensed acceleration
Implementation Method 2
The radio signal generator outputting a radio signal for a predetermined time period in response to an acceleration signal
Implementation Method 3
A proximity detector which detects the presence of a user at or near the lock provides a proximity detection signal to the controller
Data Source
AI summary
A wireless access control system includes a remote access device and an electronic lock. The electronic lock communicates with the remote access device. The electronic lock controls the ability to lock and unlock a door in which the electronic lock is disposed. The electronic lock determines when the remote access device is at a distance less than or equal to a predetermined distance from the lock to enable the lock to be unlocked.