Electronic Key Device Direction-Based Unlocking
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Solution Overview
Problem
Existing electronic key devices often unintentionally unlock vehicle doors or trunks when a user passes within a predetermined distance, even if they do not intend to enter the vehicle, leading to security issues.
Innovation Solution
An electronic key device system that includes a portable device and a vehicle-mounted device with multiple antennas, which transmit and receive radio waves to determine the user's approach direction and distance, ensuring that doors are only unlocked when the user is attempting to enter the vehicle by analyzing changes in reception strength and direction over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle-mounted device transmits radio waves and detects reception strength to determine user approach, then the door unlocking function is activated, but unintended unlocking occurs when users merely pass by without entering intent
Solution Approach 1:
The system transitions from static distance-based unlocking to dynamic direction-based unlocking. The vehicle-mounted device continuously transmits radio waves and analyzes changes in reception strength over time to determine the user's moving direction. By calculating the rate of change of reception strength and comparing it against threshold values, the system dynamically adjusts unlocking behavior based on whether the user is approaching the vehicle or merely passing by, thereby preventing unintended unlocking while maintaining reliable access for legitimate users.
2Measurement precision
If the system uses multiple antennas to determine moving direction, then the precision of user intent detection is improved, but the device complexity increases
Solution Approach 1:
The system divides the vehicle's exterior into multiple detection zones, each associated with a specific antenna. By segmenting the detection space and assigning specific antennas to specific zones (front, rear, left, right), the system can determine which zone the user is approaching based on which antenna receives the strongest signal. This segmentation approach enables precise direction detection while keeping the system architecture manageable through modular zone-based processing.
Solution Approach 2:
The system implements continuous feedback by repeatedly transmitting radio waves from multiple antennas and analyzing the reception strength changes over time. The portable device returns reception strength information, which the vehicle-mounted device uses to calculate the rate of change and determine moving direction. This feedback loop allows the system to continuously update its understanding of user intent based on real-time signal variations, improving measurement precision through iterative analysis.
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 reliably unlocks vehicle doors only when the user is approaching, preventing unintended unlocking and enhancing security by accurately determining the user's intent to enter.
Implementation Method 1
a plurality of antennas ANT1 to ANT3 provided in different positions of a vehicle 1... transmit radio waves every predetermined time... based on the reception strength of radio waves transmitted from the plurality of antennas
Data Source
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AI summary
An electronic key device includes a portable device (3)capable of being carried by a user, and a vehicle-mounted device (2) configured to perform mutual communication with the portable device (3). The vehicle-mounted device (2) includes a plurality of antennas (ANT1, ANT2, ANT3) that is provided in different positions of a vehicle and is configured to transmit radio waves every predetermined time. A response signal based on the reception strength of the radio waves transmitted from the plurality of antennas is transmitted from the portable device (3) to the vehicle-mounted device (2). The vehicle-mounted device (2) determines that a moving direction of the portable device (3) heads for any one of the antennas based on the response signal, and when it is determined that a distance between the vehicle (1) and the portable device (3) is equal to or less than a predetermined threshold, control is performed such that a door (1a, 1b) becomes unlocked.