Seat Belt Buckle RFID Detection for Fake Tongue Prevention
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Solution Overview
Problem
Existing seat belt buckle systems fail to reliably distinguish between the correct belt tongue and an unauthorized one, allowing fake tongues or passenger belts to be used, which poses safety risks and inaccuracies in vehicle function activation.
Innovation Solution
Incorporating an RFID transponder in the belt tongue and an RFID reading unit in the seat belt buckle, ensuring coupling only occurs when the belt tongue is correctly inserted, with measures like short distance requirements and shielding to prevent unauthorized coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch is arranged in the seat belt buckle to detect insertion, then the driver can receive warning when not buckled, but fake tongues or passenger belts can be used to avoid warning
Solution Approach 1:
The patent replaces the mechanical switch detection system with an RFID (radio frequency identification) system. The RFID reading unit in the buckle wirelessly communicates with the RFID transponder in the belt tongue, eliminating the mechanical contact-based switch that could be bypassed by fake tongues. This substitution of detection mechanism fundamentally resolves the reliability issue.
Solution Approach 2:
The patent introduces an RFID transponder as an intermediary element in the belt tongue that must be properly positioned within the buckle for detection. This intermediary component acts as a mediator between the belt tongue and the reading unit, requiring precise spatial relationship (coupling) to function, thereby preventing fake tongues from triggering false positive detection.
2Reliability
If the RFID transponder is arranged in the belt tongue, then only the assigned belt tongue can be recognized, but coupling must be restricted to inserted state only
Solution Approach 1:
The patent utilizes changes in electromagnetic coupling parameters (signal strength, impedance) that occur when the belt tongue is inserted versus when it is outside the buckle. The RFID reading unit detects these parameter changes to determine insertion state, restricting transponder activation or signal recognition to only the inserted state without requiring mechanical constraints.
3Reliability
If additional measures like short distance requirements and shielding are implemented, then unauthorized coupling is prevented, but device complexity increases
Solution Approach 1:
The patent replaces potential mechanical shielding or physical constraints with electromagnetic field-based solutions. The RFID system inherently provides directional coupling characteristics and the reading unit can be designed with antenna orientation and signal filtering that naturally restricts coupling to the inserted state, eliminating the need for additional mechanical shielding components.
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
Ensures only the assigned belt tongue is recognized as inserted, eliminating safety hazards and eliminating the need for additional switches, with the RFID system providing a discrete signal for correct insertion.
Implementation Method 1
The RFID transponder, which is also referred to as a tag or a chip, is activated and supplied with energy via an electromagnetic field generated by the RFID reading unit.
Data Source
AI summary
A seat belt buckle (1) and a belt tongue (2) which can be inserted into the seat belt buckle (1). An RFID responder (3) is arranged in or on the belt tongue (2) and an RFID reading unit (4) is arranged in the seat belt buckle (1) and is designed in such a way that a coupling between the RFID reading unit (4) and the RFID transponder (3) is only possible if the belt tongue (2) is inserted into the seat belt buckle (1).