Physical Quantity Detection Circuit for Vibration Leakage Diagnosis
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Solution Overview
Problem
Existing physical quantity sensors face challenges in accurately diagnosing failures due to noise components and zero-point deviations caused by vibration leakage, which affect the reliability of signal outputs in both normal and abnormal conditions.
Innovation Solution
A physical quantity detection circuit that differentially amplifies and synchronously detects signals from a physical quantity detection device to isolate and subtract vibration leakage components, generating a clean physical quantity signal and a separate vibration leakage signal, allowing for effective failure diagnosis based on the leakage signal's magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the physical quantity detection device is tuned so that vibration leakage components have opposite phases, then failure diagnosis capability is improved, but noise component increases and zero point deviation occurs in normal detection mode
Solution Approach 1:
The patent segments the signal processing into two distinct modes: a physical quantity detection mode that outputs a first signal with minimized vibration leakage, and a failure diagnosis mode that outputs a second signal with enhanced vibration leakage components. This segmentation allows each mode to be optimized independently, resolving the contradiction between detection accuracy and diagnosis capability.
Solution Approach 2:
The patent dynamically switches between different signal processing configurations based on operational mode. In detection mode, the system uses one configuration that minimizes noise, while in diagnosis mode, it switches to another configuration that maximizes vibration leakage signal strength. This dynamic adaptation allows the system to achieve both high detection accuracy and effective failure diagnosis.
2Reliability
If vibration leakage components are enhanced for diagnosis, then failure detection is improved, but noise interference increases in normal operation
Solution Approach 1:
The patent performs preliminary separation of vibration leakage components during normal operation by outputting them as a distinct second signal. This preliminary action allows the vibration leakage to be isolated and enhanced only when needed for failure diagnosis, preventing noise interference during normal physical quantity detection while maintaining the ability to detect failures.
3Measurement precision
If differential amplification is used to extract physical quantity signals, then detection sensitivity is improved, but vibration leakage components remain in the output
Solution Approach 1:
The patent extracts vibration leakage components from the differential amplification output and outputs them as a separate second signal dedicated to failure diagnosis. This extraction removes the harmful vibration leakage from the primary physical quantity detection signal while making the leakage components available for independent analysis in failure diagnosis mode, thereby improving both detection sensitivity and reducing noise interference.
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 reduces noise interference and ensures accurate detection of physical quantities while enabling reliable failure diagnosis by isolating vibration leakage, thereby improving the overall reliability of the sensor system.
Implementation Method 1
a differential amplification circuit that differentially amplifies signals outputted from two detection electrodes of the physical quantity detection device
Implementation Method 2
a synchronous wave-detection circuit that performs synchronous wave-detection on differentially amplified signals
Implementation Method 3
a physical quantity detection device that detects flexural vibration of two drive vibration arms
Data Source
AI summary
A physical quantity detection circuit including a differential amplification circuit that differentially amplifies a signal pair based on a first signal containing a first physical quantity component and a first vibration leakage component and a second signal containing a second physical quantity component having a phase opposite the phase of the first physical quantity component and a second vibration leakage component having the same phase as the phase of the first vibration leakage component, an adder circuit that adds the signal pair, a first synchronous wave-detection circuit that performs synchronous wave-detection on a signal based on an output signal from the differential amplification circuit, a second synchronous wave-detection circuit that performs synchronous wave-detection on a signal based on an output signal from the adder circuit, a physical quantity detection signal generation circuit that generates a physical quantity detection signal based on an output signal from the first synchronous wave-detection circuit, and a vibration leakage signal generation circuit that generates a vibration leakage signal based on an output signal from the second synchronous wave-detection circuit.