TPMS Emitter Position Identification via Doppler Signal Processing
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Solution Overview
Problem
Existing tire pressure monitoring systems (TPMS) rely on expensive, large, and high-power-consuming accelerometers to identify the location of emitters, which is inefficient and costly.
Innovation Solution
A method that uses intermediate-frequency signal processing, fast Fourier transform, and Doppler effect analysis to determine the position of TPMS emitters without accelerometers, by reconstructing radiofrequency signals and correlating them with anti-lock braking system signals to identify wheel positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If accelerometers are used to identify TPMS emitter positions, then measurement precision is improved, but device complexity, cost, and power consumption increase
Solution Approach 1:
The patent extracts the position identification function from the accelerometer and relocates it to the receiver unit. By removing the accelerometer from the emitter and using only the radiofrequency signal processing at the receiver side, the system achieves position identification without requiring expensive accelerometer components in each emitter.
Solution Approach 2:
The patent introduces intermediate-frequency signal processing as an intermediary mechanism. By reconstructing the radiofrequency signal at the receiver and processing it through fast Fourier transform to detect Doppler frequency shifts, the system mediates between the simple emitter transmission and the complex position identification requirement.
2Measurement precision
If accelerometers are used in TPMS emitters, then emitter position can be determined, but manufacturing cost increases
Solution Approach 1:
The patent extracts the position identification function from the emitter unit and relocates it to the receiver unit. This extraction eliminates the need for expensive accelerometer components in each emitter, significantly reducing manufacturing costs while maintaining the capability to identify emitter positions.
Solution Approach 2:
The patent uses signal processing copies (fast Fourier transform of the radiofrequency signal) to create virtual position information without physical sensors. By analyzing the Doppler frequency shift in the copied signal representation, the system determines position without requiring expensive physical accelerometer copies in each emitter.
3Measurement precision
If accelerometers are used for position identification, then position accuracy is improved, but power consumption increases
Solution Approach 1:
The patent extracts the power-intensive position identification processing from the emitter to the receiver unit. By removing the accelerometer and its continuous operation from the emitter, the system dramatically reduces emitter power consumption while maintaining position identification capability at the receiver side where power is more readily available.
Solution Approach 2:
The patent uses periodic signal transmission and processing instead of continuous accelerometer operation. The radiofrequency signals are transmitted periodically, and position identification is performed by processing these periodic signals at the receiver through fast Fourier transform, reducing the need for continuous power consumption in the emitter.
4Measurement precision
If accelerometers are used to identify wheel position, then position determination is accurate, but system size increases
Solution Approach 1:
The patent extracts the accelerometer component from the emitter unit and relocates the position identification function to the receiver unit. This extraction significantly reduces the physical size and volume of the emitter while maintaining accurate wheel position identification through signal processing at the receiver side.
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 accurate and cost-effective identification of TPMS emitter positions, reducing the need for expensive accelerometer components and improving system efficiency.
Implementation Method 1
it is determined whether there is a frequency deviation of the intermediate-frequency signal by comparing the instantaneous value of the fast Fourier transform to the average value of the fast Fourier transform
Data Source
AI summary
A method for identifying at least one emitter for monitoring the tire pressure of a motor vehicle by association with one of the wheels of the motor vehicle. The method includes: for each emitter monitoring tire pressure, reconstructing an intermediate-frequency signal from the radiofrequency signal and a reference signal, determining the FFT of the intermediate-frequency signal, determining whether there is a frequency deviation of the intermediate-frequency signal, determining the side of the vehicle on which the emitter monitoring the pressure of a tire is placed, acquiring a signal from the anti-lock braking system for at least one of the wheels on the side on which it was determined that the emitter for monitoring the pressure of a tire is placed, and determining the position of the emitter for monitoring the pressure of a tire depending on the deviation and on the at least one signal from the anti-lock braking system.