Smart Door Lock Sensing Layout for Inside-Outside Unlock Detection
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Solution Overview
Problem
Existing smart door locks using Bluetooth technology face issues with signal attenuation causing inaccurate distance measurement, inability to distinguish between inside and outside the door, and potential incorrect unlocking.
Innovation Solution
A safe door opening technology utilizing radar and UWB sensing, incorporating dual Bluetooth setups and dual UWB antennas to create stable connection and sensing ranges, with radar for outside detection and UWB for precise distance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single Bluetooth antenna is used for distance measurement, then the device complexity is reduced, but the measurement precision deteriorates due to signal attenuation and inability to distinguish inside/outside the door
Solution Approach 1:
The patent divides the single antenna function into multiple specialized antennas: a first Bluetooth antenna and a second Bluetooth antenna for communication, and a separate UWB antenna for distance measurement. This segmentation allows each antenna to be optimized for its specific function, with the UWB antenna providing accurate distance measurement independent of Bluetooth signal attenuation through the door.
Solution Approach 2:
The patent introduces UWB (Ultra-Wideband) technology as an intermediary measurement mechanism. The UWB antenna serves as a mediator that provides accurate distance measurement without being affected by the door's signal attenuation, thereby resolving the contradiction between using simple Bluetooth antennas and achieving precise distance measurement.
2Ease of operation
If Bluetooth signal is used to detect door position, then the ease of operation is improved, but the reliability deteriorates due to signal weakening causing incorrect inside/outside identification
Solution Approach 1:
The patent replaces the Bluetooth-based position detection system with a radar-based detection system. The radar antenna actively emits signals and detects reflections to determine door position, providing reliable inside/outside identification that is not dependent on Bluetooth signal strength, thereby resolving the reliability issue while maintaining ease of operation.
Solution Approach 2:
The radar system acts as an intermediary detection mechanism that independently verifies door position. By introducing this separate detection layer, the system can accurately determine whether the terminal is inside or outside the door regardless of Bluetooth signal attenuation, improving reliability without complicating the user operation.
3Measurement precision
If dual Bluetooth antennas are added to distinguish inside/outside the door, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The patent makes the radar antenna multi-functional by using it for both position detection (inside/outside identification) and distance measurement. This universality allows the system to achieve accurate inside/outside detection without adding separate specialized antennas, thereby improving measurement precision while limiting the increase in device complexity.
Solution Approach 2:
The patent combines the position detection function with the distance measurement function in a single radar system. By merging these functions into one antenna system rather than using separate antennas for each function, the patent achieves accurate inside/outside detection while avoiding the complexity increase that would result from adding multiple specialized antennas.
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
Enhances the accuracy and reliability of door identification, ensuring safe and stable unlocking by accurately distinguishing between inside and outside the door, despite signal attenuation.
Implementation Method 1
the radar forms a scanning range at a fixed angle outside the door for judging whether a communication terminal is outside the door
Implementation Method 2
the first UWB antenna forms a sensing range of 2 m at a fixed angle outside the door, and the second UWB antenna forms an unlocking range of 1 m at a fixed angle outside the door
Data Source
AI summary
A safe door opening technology based on radar and UWB sensing, comprising a first Bluetooth arranged on a front lock body, wherein a first UWB antenna and a second UWB antenna are symmetrically arranged in middle portions of the front lock body, a radar is arranged on the front lock body and below an NFC antenna, and a second Bluetooth corresponding to the position of the first Bluetooth is arranged on the rear lock body. The present invention adds the radar to the front lock body to detect the outside of a door, and can determine whether a terminal (mobile phone) used by a user is inside or outside the door, which avoids the problem of difficulty in distinguishing inside and outside the door caused by only Bluetooth connection in the prior art, and further makes the setting of sensing and unlocking distances respectively as the terminal approaches.