Gas Sensor System with Dual Detection Units and Diffusion Resistance Ratio
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Solution Overview
Problem
Existing gas sensor systems face challenges in maintaining measurement accuracy when the concentrations of gas components change over time, such as in exhaust gases from automobiles, due to fluctuations in engine operating states.
Innovation Solution
A gas sensor system comprising a first and second gas detection unit with conversion mediums having different conversion efficiencies, and a calculation unit that calculates gas concentrations based on detection results from these units, with a diffusion resistance ratio between the units ranging from 0.71 to 1.4, ensuring improved measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gas sensor systems use conversion mediums to measure gas concentrations, then measurement capability is improved, but measurement accuracy deteriorates when gas component concentrations change over time
Solution Approach 1:
The gas sensor system is divided into multiple detection units (first and second gas detection units), each with its own conversion medium and detection device. This segmentation allows independent measurement of different gas components (NH3 and NOx) through separate detection paths, enabling accurate concentration calculations even when gas compositions change dynamically.
Solution Approach 2:
The invention utilizes changes in conversion efficiency parameters of conversion mediums under different operating conditions. By monitoring how conversion efficiency varies with temperature and gas composition, the system can compensate for dynamic changes and maintain measurement accuracy through real-time parameter adjustment and calibration.
2Measurement precision
If conversion mediums with different conversion efficiencies are used, then gas concentration calculation capability is improved, but device complexity increases
Solution Approach 1:
The detection devices used in both gas detection units are substantially the same type, providing universal functionality for detecting the second gas type. This multi-functionality approach allows the system to achieve complex measurement capabilities (simultaneous NH3 and NOx measurement) while using standardized detection components, thereby reducing overall device complexity.
Solution Approach 2:
Conversion mediums serve as intermediaries that transform the first gas type into the second gas type, enabling indirect measurement of NH3 concentration through NOx detection. This intermediary mechanism allows the system to measure multiple gas components using a single type of detection device, simplifying the overall system structure.
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 system enhances measurement accuracy for dynamic gas environments by minimizing measurement errors and maintaining precise concentration calculations despite changes in gas component concentrations over time.
Implementation Method 1
a first conversion medium disposed between the first gas introduction port and the first measurement chamber, and configured to convert a portion of the first gas type into the second gas type
Implementation Method 2
a first detection device configured to detect the second gas type in the first measurement chamber
Implementation Method 3
A ratio of a first diffusion resistance from the first gas introduction port to the first measurement chamber, and a second diffusion resistance from the second gas introduction port to the second measurement chamber
Data Source
AI summary
A gas sensor system is equipped with a first gas detection unit, and a second gas detection unit. The first and second gas detection units include a gas introduction port for introducing a gas to be measured, a measurement chamber communicating with the gas introduction port, a conversion medium (NH3 oxidation catalyst) arranged between the gas introduction port and the measurement chamber, and which converts a portion of a first gas type into a second gas type, and a detection device that detects the second gas type. A ratio of diffusion resistances of the first gas detection unit and the second gas detection unit is greater than or equal to 0.71 and less than or equal to 1.4.