Strain Sensor Waveform Peak Separation for Multi-Quantity Detection
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Solution Overview
Problem
Existing tire sensor technologies face challenges in accurately detecting load weight and other physical quantities due to mixed signal components, leading to reduced detection accuracy and a lack of consideration for simultaneous detection of multiple quantities using a single sensor.
Innovation Solution
A physical quantity detecting device employing a strain sensor with a sensor signal waveform that includes a reference level, a positively changing level, and a negatively changing level, where an estimating unit identifies peak values corresponding to different physical quantities, allowing for high-accuracy detection of multiple quantities from a single sensor output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a strain sensor is used to detect load weight and wear amount, then detection capability is provided, but detection accuracy deteriorates due to mixed signal components from other physical quantities
Solution Approach 1:
The sensor signal waveform is segmented into distinct positive and negative level components, each corresponding to different physical quantities. The estimating unit separates the mixed signal by identifying peak values at different levels, effectively dividing the detection task to improve accuracy for each specific parameter while maintaining overall detection capability.
2Device complexity
If one sensor element is used to detect multiple physical quantities, then device complexity is reduced, but measurement precision deteriorates due to signal mixing
Solution Approach 1:
A single sensor element is designed to perform multiple detection functions simultaneously. The sensor signal waveform contains information about load weight, wear amount, and other physical quantities, which are extracted through the estimating unit's analysis of positive and negative level peak values, enabling one sensor to replace multiple specialized sensors.
3Measurement precision
If signal correction for air pressure is applied, then detection accuracy for load weight improves, but other mixed signal components from temperature and velocity remain uncorrected
Solution Approach 1:
The signal correction process is segmented into multiple independent correction steps, each addressing a specific physical quantity's influence. The estimating unit separately corrects for air pressure, temperature, and velocity effects on the sensor signal waveform, ensuring comprehensive accuracy improvement without leaving residual errors from uncorrected components.
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 the simultaneous detection of multiple physical quantities, such as wear amount and load weight, with improved accuracy by correcting for mixed signal components like air pressure, temperature, and velocity, enhancing safety and reliability in tire monitoring systems.
Implementation Method 1
A strain sensor of a tire can detect a load weight acting on the tire and a wear amount of the tire by detecting a strain deformation of the tire
Implementation Method 2
one or two or more piezoelectric film deformation measuring sensors attached to a tire side wall(s). A deformation measuring sensor generates a deformation signal
Data Source
AI summary
A physical quantity detecting device (10) detects a plurality of different physical quantities on the basis of an output signal waveform. A strain sensor (3) as one sensor element outputs a sensor signal waveform (15) having a reference level (151), a positive level positively changing from the reference level (151), and a negative level negatively changing from the reference level (151). An estimating unit (4) estimates a first physical quantity corresponding to a peak value (152) of the positive level and a second physical quantity corresponding to a peak value (153) of the negative level on the basis of the sensor signal waveform (15) output by the strain sensor (3).