TPMS Signal Filtering for Low-Noise, Low-Power Pressure Monitoring
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Solution Overview
Problem
Tire pressure monitoring systems (TPMS) face challenges with battery life and noise contamination of signals, leading to increased downtime and reduced effectiveness due to phase distortion and high energy consumption.
Innovation Solution
A TPMS system that includes an amplifier, filter, analog-to-digital converter, memory, and digital signal processor with selectable filters, which processes signals to minimize filter settling time and correct phase distortion by reversing and reprocessing signals, using Z delay register values to reduce energy consumption and extend battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional analog filters are used to filter road noise from TPMS signals, then noise reduction is achieved, but the filter size increases, phase distortion increases, and energy consumption increases
Solution Approach 1:
The patent replaces traditional analog mechanical filters with a digital signal processing system. The analog filter is substituted by a digital processor that implements filtering algorithms in the digital domain, eliminating the physical constraints and high energy consumption of analog components while maintaining noise reduction effectiveness.
Solution Approach 2:
The patent changes the operating parameters of the filtering system by using digital rather than analog processing. This parameter change allows for adaptive filtering where the filter characteristics can be dynamically adjusted based on signal conditions, reducing energy consumption while maintaining effective noise reduction.
2Object-affected harmful factors
If traditional analog filters are used to filter road noise from TPMS signals, then noise reduction is achieved, but phase distortion increases
Solution Approach 1:
The patent replaces traditional analog mechanical filters with a digital signal processing system. The analog filter is substituted by a digital processor that implements filtering algorithms in the digital domain, eliminating the physical constraints and high energy consumption of analog components while maintaining noise reduction effectiveness.
3Measurement precision
If the TPMS processes signals continuously with high sampling rates, then signal accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic signal processing where the digital processor activates only during specific intervals to process received signals. Instead of continuous high-rate processing, the system uses periodic processing with adaptive sampling that maintains signal accuracy while significantly reducing overall energy consumption by keeping the processor in low-power states between processing intervals.
4Reliability
If the TPMS operates in real-time with continuous processing, then monitoring effectiveness is improved, but battery life decreases
Solution Approach 1:
The patent implements periodic signal processing where the digital processor activates only during specific intervals to process received signals. Instead of continuous high-rate processing, the system uses periodic processing with adaptive sampling that maintains signal accuracy while significantly reducing overall energy consumption by keeping the processor in low-power states between processing intervals.
Solution Approach 2:
The patent changes the operating parameters of the filtering system by using digital rather than analog processing. This parameter change allows for adaptive filtering where the filter characteristics can be dynamically adjusted based on signal conditions, reducing energy consumption while maintaining effective noise reduction.
Data Source
AI summary
The present disclosure relates to a system and method for a tire pressure monitoring system. Embodiments may include receiving and storing an input signal in a memory; receiving a digital signal from the memory at a digital signal processor, wherein the digital signal processor includes a plurality of selectable filters; filtering the digital signal through the plurality of selectable filters, wherein filtering the digital signal generates a forward-filtered digital signal; storing the forward-filtered digital signal in the memory; reversing the forward-filtered digital signal, wherein reversing the forward-filtered digital signal generates a reverse-filtered digital signal; and filtering the reverse-filtered digital signal through the plurality of selectable filters, wherein filtering the reverse-filtered digital signal generates a processed signal.