Gas Sensor Guide Body for NOx Detection Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas sensors face challenges in achieving both high detection accuracy and responsiveness for specific gas components like NOx, as they require contradictory characteristics to minimize temperature changes and ensure gas flow to the detection section, which current designs fail to balance effectively.
Innovation Solution
The gas sensor design incorporates a guide body within the inner cover that positions the base end section of the first inner circulation hole close to the tip end of the sensor element, allowing quick gas flow to the detection section while preventing direct collisions, thereby controlling temperature changes and improving responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the opening in the inner cover is positioned to allow measured gas to reach the detection section quickly, then responsiveness is improved, but temperature changes in the detection section increase reducing accuracy
Solution Approach 1:
The patent introduces an intermediary structure (the specific opening configuration and internal flow path design in the inner cover) that mediates between the measured gas and the detection section. The opening is positioned and sized to control gas flow velocity and direction, allowing rapid gas arrival while distributing the flow to minimize direct thermal冲击 on the detection section, thus resolving the contradiction between responsiveness and accuracy
2Productivity
If the opening in the inner cover allows direct gas flow to the detection section, then responsiveness is improved, but temperature stability deteriorates
Solution Approach 1:
The patent applies local quality by creating different flow characteristics in different regions of the inner cover. The opening configuration generates a flow pattern where gas velocity is high near the detection section for rapid response, but the flow is distributed and controlled to prevent excessive temperature changes at the detection location, achieving both fast detection and temperature stability through spatially differentiated flow control
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 design enhances both the accuracy and responsiveness of the gas sensor by ensuring rapid gas reachability to the detection section while minimizing temperature changes, thus effectively detecting specific gas components like NOx.
Implementation Method 1
the measured gas introduced from the opening in the inner cover into the inner cover is more likely to collide with a position on a base end side relative to the detection section
Data Source
AI summary
Provided is a gas sensor achieving improvement in detection accuracy for a specific gas component and responsiveness for detecting the specific gas component. A guide body is provided at a base end section of a first inner circulation hole in an inner cover of the gas sensor. The base end section is located between a base end position P1 2 mm away from a tip end of a sensor element in an axial direction L towards a base end side L1 and a tip end position P2 2 mm away from the tip end towards a tip end side L2. The tip end is on the base end side L1 relative to an imaginary line K passing through a base end and a tip end on a surface on the tip end side of the guide body.