Wireless Seat Belt Buckle Using Hall Effect Sensor
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Solution Overview
Problem
Current vehicle seat belt buckles rely on wired sensor assemblies for monitoring and detecting latching and unlatching, which may be cumbersome and limited in functionality compared to a wireless solution.
Innovation Solution
A vehicle seat belt buckle with a wireless sensor system that includes a Hall Effect sensor, a microcontroller, and an RF transmitter, utilizing a magnet and shunt plate to detect the buckled or unbuckled state and transmit this information via RF signals, allowing for efficient power management and low-power operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wired sensor assembly is used for monitoring the seat belt buckle, then the system structure is simple and reliable, but the functionality is limited and the system is cumbersome
Solution Approach 1:
The patent replaces the traditional wired mechanical sensor system with a wireless sensing system that uses a Hall Effect sensor to detect magnetic field changes. This substitution eliminates physical wiring while providing enhanced functionality through wireless communication capabilities, directly resolving the contradiction between improved adaptability and reduced device complexity.
Solution Approach 2:
The patent introduces a Hall Effect sensor as an intermediary device that detects magnetic field changes caused by magnet movement. This intermediary enables wireless detection of buckle state without requiring direct mechanical or wired connections, thereby enhancing functionality while maintaining system simplicity.
2Ease of operation
If a wireless sensor system with RF transmitter is implemented, then the functionality and ease of operation are improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic action by having the RF transmitter operate only at specific moments when state changes occur (latching or unlatching events) rather than continuously. The system transitions between sleep and active states based on detected magnetic field changes, significantly reducing overall power consumption while maintaining ease of operation through on-demand wireless communication.
3Reliability
If continuous monitoring is performed to ensure reliability, then the detection accuracy is maintained, but the power consumption increases
Solution Approach 1:
The system performs monitoring periodically based on magnetic field change detection rather than continuously. The Hall Effect sensor continuously detects magnetic field changes, but the RF transmission and full system activation occur only when state changes are detected, maintaining reliability while reducing power consumption through event-triggered operation.
Solution Approach 2:
The system uses the movement of the magnet itself (caused by buckle state changes) to trigger the detection and communication process. The physical action of latching or unlatching automatically activates the sensing and transmission sequence without requiring continuous external power or control, thereby maintaining reliability while minimizing power consumption.
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
Enables reliable wireless detection and reporting of the seat belt's latched or unlatched state to the vehicle's control module, enhancing functionality and reducing power consumption through efficient power management.
Implementation Method 1
the sensor integrated circuit is a Hall Effect sensor and further comprising a magnet in the buckle, the Hall Effect sensor sensing changes in the magnetic field of the magnet in response to a change in the buckled or unbuckled condition of the buckle
Data Source
AI summary
A buckle, such as a vehicle seat belt buckle, operable between a buckled and unbuckled condition. A sensor integrated circuit in the buckle senses the buckled or unbuckled condition of the buckle and generates an electrical signal indicative of the buckled or unbuckled condition of the buckle. A RF integrated circuit in the buckle and in the form of a microcontroller integrated circuit with an RF signal transmitter receives the electrical signal generated by the sensor integrated circuit and transmits an RF signal indicative of the buckled or unbuckled condition of the buckle to a vehicle's control unit via an RF signal antenna in the buckle. A battery in the buckle provides power to the sensor and RF integrated circuits.