Particulate Matter Sensor Segmented Cells
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Solution Overview
Problem
Existing particulate matter sensors for diesel vehicles require initial accumulation time and have complex structures, leading to decreased accuracy and difficulty in miniaturization, making them inefficient for real-time detection and filter breakage determination.
Innovation Solution
A particulate matter sensor with a bottleneck structure, featuring a cartridge, substrate, and conductor with slanted surfaces and hot wires, which rapidly accumulates and measures variations in capacitance or resistance to reduce initial accumulation time and optimize filter breakage detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a conventional particulate matter sensor structure is used, then the sensor can detect particulate matter, but it requires an initial accumulation time and has a complex structure
Solution Approach 1:
The sensor structure is segmented into multiple cells (first cell, second cell, third cell) with different configurations. Each cell has specific penetration holes and electrode arrangements that facilitate rapid particulate matter accumulation. This segmentation allows parallel processing of exhaust gas through multiple pathways, reducing the initial accumulation time while maintaining a manageable overall structure through modular design.
Solution Approach 2:
The patent introduces a multi-dimensional approach by creating cells with varying numbers of penetration holes (first cell with more holes, second cell with fewer holes, third cell with specific hole count) and arranging electrodes in different configurations. This dimensional variation in hole distribution and electrode placement optimizes the accumulation rate across different spatial zones, enabling faster detection without requiring a uniformly complex structure throughout.
2Ease of manufacture
If the sensor structure is simplified, then manufacturing cost decreases, but accuracy of detection decreases
Solution Approach 1:
Different regions of the sensor are assigned different qualities and functions. The first cell contains multiple penetration holes for rapid initial accumulation, the second cell has fewer holes for refined measurement, and the third cell has a specific configuration for verification. Each region's electrode density and hole distribution are optimized locally to perform its specific function, achieving high overall accuracy while maintaining manufacturing simplicity through standardized local patterns that can be mass-produced.
Solution Approach 2:
The sensor utilizes a porous substrate structure with through-holes that allow exhaust gas to pass through while capturing particulate matter. The controlled porosity and hole distribution in different cells create optimal accumulation conditions without requiring complex solid structures. This porous approach simplifies manufacturing compared to solid-state alternatives while maintaining high detection accuracy through the natural filtration and accumulation properties of the porous medium.
3Loss of time
If the sensor accumulates particulate matter rapidly, then initial accumulation time decreases, but the sensor size increases
Solution Approach 1:
The sensor is divided into multiple compact cells that process exhaust gas in parallel. By segmenting the accumulation function across several smaller units rather than requiring one large accumulation chamber, the sensor achieves rapid overall accumulation while maintaining a compact form factor. Each cell contributes to the total accumulation rate, and their modular arrangement optimizes space utilization.
Solution Approach 2:
The sensor employs a nested configuration where multiple cells are arranged within a compact cartridge structure. The cells are positioned to maximize space utilization, with electrodes and penetration holes nested within the available volume. This nesting approach allows rapid accumulation functionality to be packed into a small overall sensor size, avoiding the need for a large external dimensions.
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
The sensor effectively reduces initial accumulation time, captures 90% or more of particulate matter, and optimizes filter breakage detection, enabling more accurate and miniaturized particulate matter monitoring.
Implementation Method 1
The particulate matter sensor detects a particulate matter included in the exhaust gas based on a variation of resistance or capacitance
Implementation Method 2
The particulate matter sensor detects a particulate matter included in the exhaust gas based on a variation of resistance or capacitance
Implementation Method 3
Each cell may be formed at a front surface of the conductor by a wet etching process
Data Source
AI summary
A particulate matter sensor includes a cartridge having an opening, and a substrate disposed inside the cartridge. A conductor is in contact with one surface of the substrate, has a plurality of penetration holes through a flow direction of the exhaust gas, and includes a plurality of cells formed therein with an electrode layer. The particulate matter sensor detects a particulate matter included in the exhaust gas based on a variation of resistance or capacitance.