Tire Pressure Monitoring System Frequency Divider Clock Generation
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Solution Overview
Problem
Existing tire pressure monitoring systems face challenges in maintaining accurate data transmission rates via wireless communications without increasing the number of oscillators or costs, particularly due to the limited power supply and need for battery conservation in tire-mounted modules.
Innovation Solution
The system incorporates a pressure sensor, converter, oscillator circuit, transmitter, battery, and frequency divider to generate a clock signal for data transmission, reducing power consumption and variations in data transmission rates without using high-frequency stability oscillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a quartz oscillator with high frequency stability is used to generate a drive clock signal for data transmission, then the accuracy of the data transmission rate is improved, but the number of oscillators increases and the cost increases
Solution Approach 1:
The patent combines the carrier wave generation and clock signal generation functions into a single oscillator circuit. The oscillator generates a carrier wave, which is then divided by a frequency divider to produce the clock signal for data transmission timing. This eliminates the need for separate oscillators for each function, reducing component count while maintaining transmission accuracy.
Solution Approach 2:
The oscillator circuit serves multiple functions: generating the carrier wave for wireless transmission and providing the clock signal for data timing. By making the oscillator multi-functional, the patent avoids adding extra oscillators, thereby reducing device complexity and cost while ensuring accurate data transmission rates.
2Adaptability or versatility
If a battery is mounted in the tire to supply power to the measuring module, then the module can operate independently, but the power supply is limited and power consumption must be reduced
Solution Approach 1:
The system transmits data periodically rather than continuously. The microcomputer controls transmission at specific intervals, allowing the battery to conserve power during non-transmission periods. This periodic operation maintains independent functionality while significantly reducing overall power consumption compared to continuous transmission.
3Area of stationary object
If the area of the board is reduced to minimize tire module size, then the system becomes more compact, but the layout and wiring become more difficult
Solution Approach 1:
The patent merges multiple functions into fewer components, reducing the overall number of elements that need to be laid out and wired on the board. By combining oscillator and carrier wave generation, and using integrated circuits for the frequency divider and microcomputer, the board area is reduced while keeping the manufacturing process manageable through functional integration.
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 configuration ensures accurate data transmission while minimizing power consumption and costs, extending battery life and allowing for a smaller, lighter tire pressure monitoring system.
Implementation Method 1
a pressure sensor for converting pressure of a gas present in a tire into an electrical signal and outputting the electrical signal
Implementation Method 2
an oscillator circuit for outputting a carrier wave to be used to wirelessly transmit data
Implementation Method 3
a transmitter for wirelessly transmitting the data to the outside of the tire
Data Source
AI summary
A tire pressure monitoring system is capable of ensuring accuracy of the rate of transmission of data via wireless communications without an increase in the number of oscillators and an increase in the cost. The tire pressure monitoring system includes a tire pressure measuring module. The tire pressure measuring module has a microcomputer, an activation control circuit, a pressure sensor, a temperature sensor, a frequency divider, a transmitting circuit, and a battery. The microcomputer has a clock pulse generator, analog-to-digital converter circuits and a controller. The transmitting circuit has an oscillator circuit. The frequency divider divides the frequency of a carrier wave CW output from the oscillator circuit to generate a clock signal, and outputs the clock signal to the controller included in the microcomputer. The clock signal is used for the timing for outputting data to a data signal line DL. The clock signal for high precision data transmission can be generated without the need to provide an expensive oscillator in the microcomputer since the oscillator circuit is used in the transmitting circuit, and the clock signal used for data transmission by the microcomputer is generated by the inexpensive frequency divider.