Dual-Frequency Detection Circuit for Accurate Failure Diagnosis
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Solution Overview
Problem
Existing physical quantity detection devices face challenges in accurately diagnosing failures due to vibration leakage components that can degrade detection accuracy, especially when the vibration leakage signal is zero or close to zero, leading to potential errors in failure diagnosis.
Innovation Solution
A physical quantity detection circuit that applies drive signals with distinct frequency components to generate electrostatic leakage components, which are used to output failure diagnosis signals based on these components, thereby improving failure detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tuning is performed to generate large vibration leakage components for failure diagnosis, then failure diagnosis capability is improved, but detection accuracy of physical quantity is degraded
Solution Approach 1:
The patent segments the drive signal into two distinct frequency components: a first frequency component for driving the physical quantity detection element and a second frequency component for generating electrostatic leakage components. This segmentation allows the system to separately obtain vibration leakage signals and electrostatic leakage signals, enabling failure diagnosis without degrading physical quantity detection accuracy.
Solution Approach 2:
The patent introduces electrostatic leakage components as an intermediary mechanism for failure diagnosis. These components are generated by applying a second frequency component to the drive electrode, which then couples to detection electrodes through electrostatic coupling capacitors. This intermediary approach provides a reliable failure diagnosis signal without relying on vibration leakage that would interfere with physical quantity detection.
2Measurement precision
If vibration leakage components are minimized for accurate physical quantity detection, then detection accuracy is improved, but failure diagnosis capability is degraded
Solution Approach 1:
The patent segments the drive signal into two distinct frequency components: a first frequency component for driving the physical quantity detection element and a second frequency component for generating electrostatic leakage components. This segmentation allows the system to separately obtain vibration leakage signals and electrostatic leakage signals, enabling failure diagnosis without degrading physical quantity detection accuracy.
Solution Approach 2:
The patent changes the frequency parameter of the drive signal by introducing a second frequency component that is different from the first frequency component. This parameter change enables the generation of electrostatic leakage components at a distinct frequency, allowing separate processing and diagnosis without interfering with the primary detection function.
3Ease of operation
If a single drive frequency is used for physical quantity detection, then detection simplicity is maintained, but failure diagnosis accuracy is degraded
Solution Approach 1:
The patent segments the drive signal into two distinct frequency components: a first frequency component for driving the physical quantity detection element and a second frequency component for generating electrostatic leakage components. This segmentation allows the system to separately obtain vibration leakage signals and electrostatic leakage signals, enabling failure diagnosis without degrading physical quantity detection accuracy.
Solution Approach 2:
The patent makes the drive signal multi-functional by incorporating both a first frequency component for physical quantity detection and a second frequency component for failure diagnosis. This universal approach allows a single drive circuit to perform both detection and diagnosis functions simultaneously, maintaining simplicity while improving reliability.
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
Enhances failure diagnosis by distinguishing between physical quantity components and electrostatic leakage components, reducing errors in detection and maintaining accuracy even when vibration leakage signals are minimal.
Implementation Method 1
a first electrostatic leakage component that is a component resulting from the second frequency component propagating to the first detection electrode via a first electrostatic coupling capacitor between the drive electrode and the first detection electrode
Data Source
AI summary
A physical quantity detection circuit includes: a drive circuit configured to apply a drive signal, which includes a first frequency component and a second frequency component having a frequency different from a frequency of the first frequency component, to a drive electrode of a physical quantity detection element; a physical quantity detection signal output circuit configured to output a physical quantity detection signal, based on a first physical quantity component output from a first detection electrode of the physical quantity detection element and a second physical quantity component output from a second detection electrode of the physical quantity detection element; and a first failure diagnosis signal output circuit configured to output a first failure diagnosis signal generated based on a first electrostatic leakage component resulting from the second frequency component propagating to the first detection electrode and a second electrostatic leakage component resulting from the second frequency component propagating to the second detection electrode.