Tire Pressure Sensor Data Transmission via Rotation Cycle Segmentation
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Solution Overview
Problem
Existing tire pressure monitoring systems face complications due to complex circuit structures and high power consumption resulting from combining multiple data items into a single signal or digital code in both the transponder and reader units.
Innovation Solution
A tire pressure measuring system that uses a sensor unit on the tire connected to a control unit via a radio link, employing an electromagnetic field for data transmission, where the sensor unit alters the electromagnetic field to transmit data, including air pressure and temperature, without the need for signal combination or digital encoding, and detects the tire rotation cycle to synchronize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple data items are combined into one signal or converted into one digitally coded bit string in the transponder, then data transmission efficiency is improved, but the circuit structure becomes complicated and power consumption increases
Solution Approach 1:
The patent segments the data transmission process by separating the transmission of identification information from the transmission of measured values. The sensor unit transmits identification information (tire ID, sensor ID) and measured values (pressure, temperature) as separate data items in different transmission cycles, rather than combining them into a single coded signal. This segmentation simplifies the circuit structure while maintaining efficient data transmission.
Solution Approach 2:
The patent employs periodic action by utilizing the tire rotation cycle to determine transmission timing. The sensor unit transmits data in multiple cycles corresponding to tire rotations, with each cycle transmitting different data items. This periodic transmission approach allows efficient data delivery without requiring complex signal combination circuits.
2Productivity
If multiple data items are combined into one signal or converted into one digitally coded bit string in the transponder, then data transmission efficiency is improved, but power consumption increases
Solution Approach 1:
The patent segments the data transmission process by separating the transmission of identification information from the transmission of measured values. The sensor unit transmits identification information (tire ID, sensor ID) and measured values (pressure, temperature) as separate data items in different transmission cycles, rather than combining them into a single coded signal. This segmentation simplifies the circuit structure while maintaining efficient data transmission.
Solution Approach 2:
The patent employs periodic action by utilizing the tire rotation cycle to determine transmission timing. The sensor unit transmits data in multiple cycles corresponding to tire rotations, with each cycle transmitting different data items. This periodic transmission approach allows efficient data delivery without requiring complex signal combination circuits.
3Device complexity
If the sensor unit transmits multiple data items alternately based on tire rotation cycle, then the structure is simplified and power consumption is reduced, but transmission time increases
Solution Approach 1:
The patent employs periodic action by utilizing the tire rotation cycle to determine transmission timing. The sensor unit transmits data in multiple cycles corresponding to tire rotations, with each cycle transmitting different data items. This periodic transmission approach allows efficient data delivery without requiring complex signal combination circuits.
Solution Approach 2:
The patent applies self-service by having the sensor unit automatically determine transmission timing based on the tire rotation cycle detected from the electromagnetic field strength variations. The system uses the natural rotation of the tire as a clock signal, eliminating the need for external timing control or complex scheduling circuits, thereby simplifying the structure while managing transmission time efficiently.
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
This approach simplifies the structure of both the sensor and control units, reducing power consumption and eliminating the need for signal combination or digital encoding, leading to a more efficient data transmission process.
Implementation Method 1
the sensor unit comprises an antenna for receiving the transmission electromagnetic field, and through mutual reaction with the transmission electromagnetic field, affecting the transmission electromagnetic field such that the transmission electromagnetic field varies
Implementation Method 2
the data transmission circuit may include a detector circuit for rectifying-detecting the variation of the transmission electromagnetic field in accordance with the transmission frequency
Data Source
AI summary
A tire pressure measuring system (TPMS) for transmitting pressure information from a tire to a vehicle body has a complicated structure when a plurality kinds of transmission data exist. A sensor unit receives a transmission electromagnetic field from a sensor control unit, and rectify-detects the received field. The counter of the sensor unit determines a rotation cycle of a tire, based on the signal obtained by the rectification detection, then switches the switch in conjunction with the rotation cycle, and sequentially sends the plurality of transmission data items for every tire rotation.