Particulate Matter Detection Element with Capacitance Component
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrical-resistance-type particulate matter detecting devices face challenges in accurately differentiating between particulate matter accumulation and electrical wire disconnection, leading to unstable output and increased manufacturing costs due to the need for precise resistance value adjustment in conductive layers, and they struggle to maintain detection accuracy as metal electrodes disperse and change resistance values over time.
Innovation Solution
The implementation of a particulate matter detecting device with a detection element that includes both a capacitance component and a direct current resistance, utilizing an alternating-current power source and detector to differentiate between particulate matter accumulation and disconnection abnormalities, while ensuring insulation properties with an insulating ceramic dielectric layer, allowing for stable detection without direct current flow to the capacitance component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive layer containing zirconia or the like is used to provide a resistance layer connected in parallel to electrical resistance formed by particulate matter, then damage and deterioration of the electrodes can be detected, but the resistance value requires precise adjustment with high accuracy, leading to increased manufacturing cost
Solution Approach 1:
The patent changes the material parameter from zirconia-based conductive layer to alumina-based insulating ceramic layer. This material substitution eliminates the need for precise resistance value adjustment while maintaining detection functionality, thereby reducing manufacturing complexity and cost
2Measurement precision
If metal electrodes are used in the detection element, then electrical resistance can be measured to detect particulate matter, but the metal disperses and changes resistance values over time, leading to unstable output
Solution Approach 1:
The patent changes the electrode material from metal to insulating ceramic (alumina). This material substitution prevents metal dispersion and resistance value drift over time, ensuring stable output while maintaining measurement precision through the capacitance component
Solution Approach 2:
The patent employs a composite structure combining insulating ceramic material with conductive properties for the detection element. This composite approach provides both the electrical measurement capability and long-term stability required for accurate particulate matter detection
3Measurement precision
If direct current is used to detect electrical resistance of particulate matter, then particulate matter accumulation can be measured, but disconnection abnormalities cannot be differentiated from particulate matter accumulation
Solution Approach 1:
The patent segments the detection function into two independent components: a direct current resistance component for measuring particulate matter accumulation and a capacitance component for detecting disconnection abnormalities. This segmentation allows each component to perform its specific function without interference, enabling differentiation between particulate matter accumulation and disconnection events
Solution Approach 2:
The detection element is designed with multi-functionality, serving both as a resistance measurement device for particulate matter detection and as a capacitance measurement device for disconnection detection. This universal design eliminates the need for separate detection systems
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 solution enables reliable and accurate detection of particulate matter and disconnection abnormalities, maintaining high detection accuracy and reducing manufacturing costs by using an insulating ceramic dielectric layer to ensure insulation and control alternating current impedance effectively.
Implementation Method 1
ensuring insulation properties with an insulating ceramic dielectric layer, allowing for stable detection without direct current flow to the capacitance component
Implementation Method 2
detects changes in electrical resistance value occurring as a result of smoke accumulating between the electrodes that serve as a detection section
Implementation Method 3
utilizing an alternating-current power source and detector to differentiate between particulate matter accumulation and disconnection abnormalities
Data Source
AI summary
A particulate matter detection element includes a capacitance component disposed in parallel with a detected resistance RSEN. A direct current-power source that supplies a direct current (IDC) for particulate matter detection, and an alternating-current power source that supplies an alternating current (IAC) for disconnection detection are provided.