Switchable Impedance Matching for Dual-Frequency TPMS Emitters

Solution Overview

Problem

Tire pressure monitoring systems face challenges in compatibility with different RF signal frequencies used by various automobile brands, requiring multiple tire pressure detectors to be stocked, leading to significant inventory costs.

Innovation Solution

A wireless signal emitter for tire pressure detectors incorporating a controller, antenna, and impedance matching module that can switch between two RF frequencies (315 MHz and 433 MHz) by adjusting impedance configurations, allowing a single detector to be compatible with multiple car brands.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple tire pressure detectors with different RF frequencies are stocked to support different car brands, then compatibility with various in-car receivers is improved, but inventory costs and device complexity increase

Engineering Contradiction:

Improvecompatibility with different in-car receiversVSAvoidinventory management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a single tire pressure detector that can operate with multiple RF frequencies (315 MHz and 433 MHz) by integrating an impedance matching module with switching capability. This allows one device to perform multiple functions - supporting different car brands and receiver types without requiring separate detectors for each frequency, thereby reducing inventory complexity while maintaining broad compatibility

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent employs dynamic impedance adjustment through a switching element controlled by a controller. The system can dynamically switch between different impedance configurations (first impedance for 315 MHz, second impedance for 433 MHz) based on the required frequency, enabling a single detector to adapt to different operational conditions and frequency requirements without manual reconfiguration

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple tire pressure detectors with different RF frequencies are stocked to support different car brands, then compatibility with various in-car receivers is improved, but stocking costs increase

Engineering Contradiction:

Improvecompatibility with different in-car receiversVSAvoidinventory stocking cost

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent implements a single tire pressure detector that can operate with multiple RF frequencies (315 MHz and 433 MHz) by integrating an impedance matching module with switching capability. This allows one device to perform multiple functions - supporting different car brands and receiver types without requiring separate detectors for each frequency, thereby reducing inventory complexity while maintaining broad compatibility

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines multiple frequency support capabilities into a single detector unit. By merging the functionality of what would traditionally require separate 315 MHz and 433 MHz detectors into one device with switchable impedance configurations, the system reduces the total quantity of detectors needed in inventory while maintaining support for multiple car brands and receiver types

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11799452B2Wireless signal emitter of tire pressure detector

Publication Date: 2023.10.24 MOBILETRON ELECTRONICS CO LTD

AI summary

A wireless signal emitter of a tire pressure detector includes a controller, an antenna, and an impedance matching module. The impedance matching module includes an impedance matching circuit and an impedance adjusting circuit. The impedance matching circuit is electrically connected to the controller. The impedance adjusting circuit is electrically connected to the antenna and the impedance matching circuit. The impedance adjusting circuit includes a switching element electrically connected to the controller. When the switching element receives different signals of the controller, the impedance adjusting circuit switches between two different configurations, so that the impedance matching module has two different impedances, thereby the antenna sends two different radio frequency signals to achieve a purpose of a single tire pressure detector suitable for in-car receivers of different frequencies.