Gas Sensor Porous Layer Design for Phosphorus Clogging
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Solution Overview
Problem
Conventional gas sensors used in internal combustion engines for combustion control face a drop in detection accuracy due to clogging caused by phosphorus and silicone, which the existing secondary porous portion structures are insufficient in preventing, leading to reduced performance and accuracy.
Innovation Solution
A gas sensing device with a first porous portion and a second porous portion, where the second porous portion is designed to invade into a concave portion formed by the first porous portion, preventing external gas invasion and enhancing phosphorus and silicone absorption without enlarging the device, thus maintaining detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a second porous portion is added to suppress clogging by phosphorus and silicone, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The second porous portion is nested within the concave portion of the first porous portion, with part of the second porous portion invading into the concave portion. This nested configuration allows the second porous portion to function as a protective layer without requiring a completely separate structural component, thereby suppressing clogging while minimizing the increase in device complexity.
2Quantity of substance
If the second porous portion is designed to invade into the concave portion, then phosphorus and silicone absorption is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The concave portion is pre-formed in the first porous portion before the second porous portion is applied. This preliminary formation of the concave portion provides a predetermined receptacle that guides the invasion of the second porous portion, ensuring proper positioning and contact with the opening edge while facilitating phosphorus and silicone absorption. This approach reduces manufacturing precision requirements compared to requiring precise post-assembly alignment.
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 solution effectively suppresses clogging in the first porous portion, improving the air-fuel ratio detection accuracy by controlling diffusion resistance and preventing separation of the second porous portion, while allowing for efficient absorption of phosphorus and silicone without delaying activation time.
Implementation Method 1
the second porous portion... sucking phosphorous and silicone... invasion of phosphorous and silicone from outside is suppressed
Implementation Method 2
The first porous portion is provided to control the diffusion rate of the measuring object gas introduced into the measuring chamber
Data Source
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AI summary
This invention provides a gas sensing device and gas sensor including a porous portion in which a first porous portion (115) absorbs phosphorus and silicone sufficiently so as to suppress generation of clogging in a second porous portion (30) meeting demands for intensifying the performance and accuracy of a gas sensor, so that the accuracy of detection of air-fuel ratio is further improved.