TPMS Sensor Antenna Matching for Fast, Low-Power Tire Detection
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Solution Overview
Problem
Current TPMS sensors face challenges with high power consumption, long data transmission cycles, and susceptibility to same-frequency interference, which limits data transmission rate and increases error rates, necessitating larger batteries and potentially compromising signal sensitivity.
Innovation Solution
A TPMS sensor with a data transmission rate greater than 20 kbps, using a terminal antenna (valve stem or tire rim) and dual-stage filtering network, coupled with a button cell battery and supercapacitor, to reduce power consumption and enhance signal strength and interference resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If traditional FSK or ASK modulation is used with battery capacity of 200 mAh or more, then the product lifespan requirement is met, but the battery size cannot be reduced
Solution Approach 1:
The patent changes the data transmission rate parameter from traditional 9.6-10 kbps to greater than 20 kbps, which directly reduces the emission time and power consumption, enabling smaller battery capacity while meeting lifespan requirements
Solution Approach 2:
The patent optimizes the radio frequency emission cycle by reducing the frame emission time from approximately 8.5 ms to less than 4.25 ms through higher transmission rate, creating a more efficient periodic transmission pattern that reduces average power consumption
2Productivity
If data transmission rate is increased to greater than 20 kbps, then emission time and power consumption are reduced, but signal transmission penetration may be affected
Solution Approach 1:
The patent uses a composite antenna system combining a built-in antenna with an external terminal antenna (valve stem or tire rim) to enhance signal transmission penetration while maintaining high data transmission rate, leveraging the complementary strengths of different antenna types
Solution Approach 2:
The patent introduces an antenna matching network as an intermediary component between the TPMS sensor and the terminal antenna, optimizing impedance matching and signal transfer to ensure reliable penetration at high transmission rates
3Use of energy by stationary object
If radio frequency emission cycle is shortened to reduce power consumption, then emission power consumption is reduced, but anti-interference capability may be affected by same-frequency signals
Solution Approach 1:
The patent implements optimized periodic transmission with emission cycles greater than 4.25 ms, balancing reduced power consumption with sufficient time for complete data frame transmission, minimizing vulnerability to same-frequency interference through consistent timing patterns
Solution Approach 2:
The patent incorporates CRC verification and acknowledgment mechanisms that provide feedback on transmission success, allowing the system to detect and handle interference events, ensuring data integrity even when emission occurs during same-frequency signal presence
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 solution achieves reduced power consumption, increased data transmission rate, improved signal penetration, and enhanced anti-interference capability, allowing for a smaller, lighter design with extended battery life and safer installation.
Implementation Method 1
a TPMS sensor, which uses ASK/OOK/FSK transmission technology with a data transmission rate greater than 20 kbps
Implementation Method 2
the TPMS sensor is connected with the terminal antenna through the antenna matching network
Data Source
AI summary
The present application discloses a vehicle tire detection device, including a TPMS (Tire Pressure Monitoring System) sensor, an antenna matching network, and a terminal antenna. The TPMS sensor uses ASK/OOK/FSK transmission technology with a data transmission rate greater than 20 kbps. The TPMS sensor is connected to the terminal antenna through the antenna matching network. The terminal antenna is one of a valve stem, a metal base, or a tire rim.