Gas Sensor Reference Gas Passage Positioning
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Solution Overview
Problem
The region of the gas detection element's rear-end portion, where terminal members contact electrode pads and through hole conductors are located, experiences a reduction in strength due to the presence of a reference gas introduction passage, compromising the sensor's reliability.
Innovation Solution
The reference gas introduction passage is positioned forward of the through hole conductor and electrode pad contact portions, ensuring that the passage does not reduce the cross-sectional area and strength of these critical regions, while still allowing reliable introduction of reference gas to the detecting section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a reference gas introduction passage is provided in the element rear-end portion where through hole conductors and electrode pads are located, then reference gas can be introduced to the detecting section, but the cross-sectional area and strength of these regions are reduced
Solution Approach 1:
The gas detection element is divided into distinct functional regions: the element rear-end portion containing through hole conductors and electrode pads, and the element intermediate portion containing the reference gas introduction passage. This spatial segmentation allows the reference gas passage to be positioned in a region that does not compromise the structural integrity of the terminal contact areas.
Solution Approach 2:
The reference gas introduction passage is positioned in the axial direction (length dimension) rather than in the radial direction (cross-sectional dimension) where the through hole conductors and electrode pads are located. By utilizing the axial dimension for the passage and keeping terminal components in the radial plane, the design avoids reducing the cross-sectional area at critical contact regions while still providing effective reference gas introduction.
2Reliability
If through hole conductors are formed in the element rear-end portion, then electrical communication with electrode pads is achieved, but the region becomes smaller in cross-sectional area and reduces in strength
Solution Approach 1:
The gas detection element is segmented into functional zones where through hole conductors are confined to the element rear-end portion for electrical communication, while the element intermediate portion is dedicated to the reference gas introduction passage. This segmentation prevents the conductors from occupying space that would be needed for structural strength in the same cross-section.
Solution Approach 2:
Through hole conductors are positioned in the element rear-end portion along the axial direction, while the reference gas introduction passage is positioned in the element intermediate portion. This axial positioning strategy allows electrical communication to be established without reducing the cross-sectional area at the terminal contact regions where strength is critical.
3Reliability
If terminal members contact electrode pads in the element rear-end portion, then electrical connection is established, but the region requires particularly high strength which is compromised by holes for through hole conductors
Solution Approach 1:
The gas detection element is divided into distinct functional regions: the element rear-end portion for terminal contacts and through hole conductors, and the element intermediate portion for the reference gas introduction passage. This segmentation ensures that the contact portions maintain their full cross-sectional area and high strength requirements while still establishing reliable electrical connections.
Solution Approach 2:
Terminal members contact electrode pads in the element rear-end portion along the axial direction, while the reference gas introduction passage is positioned in the element intermediate portion. This axial arrangement allows electrical connections to be established at the rear end without creating holes that would reduce the cross-sectional area and strength at the contact portions.
Data Source
AI summary
A gas detection element of a gas sensor has a reference gas introduction passage formed therein and extending from an opening at a radially outer perimetric surface of an element rear-end portion to a detecting section of an element forward-end portion for introducing reference gas from the opening to the detecting section. The entirety of the reference gas introduction passage is provided on a forward side in an axial direction with respect to contact portions of electrode pads and through hole conductors which are formed on and in the element rear-end portion.