Tire Pressure Detection Using Wheel Acceleration Correlation
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Solution Overview
Problem
Existing tire pressure monitoring systems (TPMS) face issues with erroneous alarms or non-alarms due to periodic noise generated near the torsional resonance frequency of tires, which can lead to incorrect detection of tire pressure decreases in driving wheels.
Innovation Solution
A tire pressure decrease detection apparatus and method that includes rotation speed and acceleration information detection, correlation calculation between left and right driving wheels, and a determination mechanism to stop estimating torsional resonance frequency when correlation exceeds a threshold, thereby removing the influence of periodic noise from driving wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the torsional resonance frequency is time-series estimated from rotation speed information to detect tire pressure decrease, then the detection capability is improved, but periodic noise from driving wheels causes erroneous alarms or non-alarms
Solution Approach 1:
The patent introduces correlation calculation as an intermediary step between rotation acceleration information and resonance frequency estimation. By calculating the correlation of rotation acceleration information from left and right driving wheels and using it as a gating condition, the system mediates between the raw sensor data and the frequency estimation process, preventing periodic noise from corrupting the resonance frequency when correlations exceed the threshold
Solution Approach 2:
The patent implements a feedback mechanism where the correlation calculation result feeds back to control the resonance frequency estimation process. When the correlation exceeds the threshold, the system detects periodic noise and stops the resonance frequency estimation, creating a closed-loop control that adjusts the detection process based on real-time noise conditions
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 effectively suppresses the impact of periodic noise, preventing erroneous alarms and ensuring accurate detection of tire pressure decreases.
Implementation Method 1
a torsional resonance frequency of the tire is lowered by deflation and time-series estimates the torsional resonance frequency of the tire from rotation speed information or rotation acceleration information of the tire
Implementation Method 2
there is sometimes a case where a periodic noise is generated in the vicinity of the torsional resonance frequency of the tire due to vehicle speed, a gear position, or the like
Data Source
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AI summary
A tire pressure decreased detection apparatus comprising rotation speed information detection means, rotation acceleration information calculation means, resonance frequency estimate means for time-series estimating a torsional resonance frequency of the rotation speed information, correlation calculation means for, regarding left and right wheels of driving wheels, calculating a time series correlation of the rotation acceleration information of the left and right wheels, and determination means for determining a decrease in pressure of the tires based on the estimated torsional resonance frequency. In a case where the correlation exceeds a predetermined threshold value, the resonance frequency estimate means stops estimating the torsional resonance frequency.