Tire Pressure Monitoring Transmitter Frequency Configuration via PLL
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Solution Overview
Problem
Conventional tire pressure monitoring detectors require two oscillators to switch between 315 MHz and 433.92 MHz frequencies, leading to high costs and technological complexity, with data transmission susceptible to interference.
Innovation Solution
A data transmitting device using a single standard oscillator and a phase locked loop with a pressure-controlling oscillator, a microcontrol unit, and a signal output unit with a variable impedance antenna, allowing users to select frequencies directly, eliminating the need for two oscillators and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two oscillators are used to switch between 315 MHz and 433.92 MHz frequencies, then frequency compatibility with different vehicular host computers is achieved, but device cost and technological complexity increase
Solution Approach 1:
The patent merges the frequency generation function into a single pressure-controlling oscillator that can operate at both 315 MHz and 433.92 MHz frequencies. This consolidates what would traditionally require two separate oscillators into one component, reducing device complexity while maintaining frequency compatibility with different vehicular host computers
Solution Approach 2:
The pressure-controlling oscillator is designed with multi-functionality to generate both 315 MHz and 433.92 MHz frequencies based on control signals from the microcontroller unit. This universal oscillator replaces the need for dedicated oscillators for each frequency, simplifying the overall device architecture
2Adaptability or versatility
If two oscillators are used to provide 315 MHz and 433.92 MHz frequencies, then frequency selection capability is achieved, but manufacturing cost increases
Solution Approach 1:
By combining the frequency generation capability into a single pressure-controlling oscillator, the patent reduces the bill of materials and assembly complexity. Manufacturers only need to produce and assemble one oscillator type rather than managing inventory and assembly of two different oscillator types, directly lowering manufacturing costs
3Speed
If data is transmitted through the PLL and matching circuit, then frequency-adjusted signals are achieved, but data transmission becomes susceptible to interference and transmission routes become intricate
Solution Approach 1:
The patent extracts the data transmission path from the frequency generation path. Data from the microcontroller unit is transmitted directly to the antenna through a dedicated transmission route, separate from the PLL and frequency generation components. This separation removes data transmission from the frequency-adjustment chain, eliminating susceptibility to interference while maintaining efficient signal frequency adjustment
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 cost-effective frequency configuration and interference-resistant data transmission, making the tire pressure monitoring detector compatible with various vehicular host computers by selecting between 315 MHz and 433.92 MHz frequencies.
Implementation Method 1
a standard oscillator for providing an oscillation signal of a fixed frequency and using the fixed frequency as a standard frequency
Implementation Method 2
a phase locked loop comprising a phase frequency comparator, a filter, and a pressure-controlling oscillator, with the phase frequency comparator being electrically connected to the standard oscillator
Data Source
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AI summary
A data transmitting device (10) capable of configuring different operating frequencies for use by a tire pressure monitoring detector includes: a standard oscillator (11); a phase locked loop (21) including a phase frequency comparator (22), a filter (24), and a pressure-controlling oscillator (26); a microcontrol unit (31) electrically connected to the standard oscillator (11) and the phase frequency comparator (22) and adapted to store a first ratio (C1) and a second ratio (C2); and a signal output unit (41) electrically connected to the output end (261) of the pressure-controlling oscillator (26) and the microcontrol unit (31). The microcontrol unit (31) allows a user to select and send the first or second ratio (C1 ·C2) to the phase frequency comparator (22). The phase locked loop (21) generates a target frequency signal (Ts) according to the first or second ratio (C1 · C2) selected by the user. The microcontrol unit (31) sends a data (D) to the signal output unit (41), and the signal output unit (41) outputs the data (D) according to the frequency of the target frequency signal (Ts).