NFC Dual-Antenna Vehicle Locking Security
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Solution Overview
Problem
Existing remote keyless entry systems for motor vehicles suffer from security flaws due to the large perimeter of access control, making them vulnerable to unauthorized access.
Innovation Solution
The implementation of Near Field Communication (NFC) technology using a dual-antenna system for secure authentication, where one antenna is integrated into the vehicle's start/stop switch and another in the passenger compartment or docking station, enabling secure locking/unlocking and starting through NFC protocols, ensuring data exchange occurs only when the user is in close proximity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If remote keyless entry systems use a large perimeter for access control, then ease of operation is improved, but security is worsened
Solution Approach 1:
The patent segments the access control system into multiple zones with different authentication requirements. The vehicle perimeter is divided into outer zones (less secure access) and inner zones (secure access requiring additional authentication). This allows convenient access from a distance while maintaining security for critical operations like engine starting.
Solution Approach 2:
Different authentication methods and security levels are applied to different locations around the vehicle. The system uses local quality by requiring NFC authentication specifically at the steering wheel area for engine starting, while allowing more convenient access from other perimeter locations. This resolves the contradiction by providing ease of operation in less critical zones while maintaining security in critical zones.
2Reliability
If NFC communication range is limited to a few centimeters, then security is improved, but ease of operation is worsened
Solution Approach 1:
The system performs preliminary authentication actions when the key is detected in the vehicle interior or near the vehicle. The NFC reader detects the key's presence and initiates authentication sequences in advance, preparing the system for subsequent operations. This allows the ultra-short NFC range to work effectively while maintaining convenience through pre-positioning of the key.
Solution Approach 2:
The patent introduces intermediary detection mechanisms (such as RFID or other longer-range detection systems) that work in conjunction with the NFC system. These intermediaries detect the key's presence from a greater distance and guide the user to the correct position for NFC authentication, thereby maintaining security through short-range NFC while improving ease of operation through the intermediary's longer-range detection capability.
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 security by limiting communication range to a few centimeters, making unauthorized access more difficult and providing intuitive and secure vehicle operation through NFC authentication.
Implementation Method 1
The NFC processor emits a magnetic field, sends data by magnetic field amplitude modulation
Implementation Method 2
The NFC protocol is based on inductive coupling and load modulation at a slave device
Implementation Method 3
receives data by charge modulation and inductive coupling
Implementation Method 4
receives data by demodulating a magnetic field emitted by the other reader
Implementation Method 5
emits data by modulating the impedance of its antenna circuit (load modulation)
Data Source
Figure 1~2
Figure 3
AI summary
The device has a motor vehicle opening locking/unlocking device (3) for controlling locking/unlocking of openings (17) of a motor vehicle (1) following reception of authentication data of a key (7) via a reading interface (9). A motor vehicle starting system (5) controls starting of the vehicle following reception of the authentication data via the reading interface. A radiofrequency communication interface (11) of the key and the reading interface process the exchange of the authentication data of the key according to a Near Field Communication (NFC)protocol.