Simulated Gas Supply Apparatus Stabilizing Flow Rates
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Solution Overview
Problem
Conventional catalyst and sensor evaluation tests face challenges in accurately simulating exhaust gas conditions due to fluctuations in raw gas flow rates, leading to instability in simulated gas concentrations and flow rates, making it difficult to achieve high accuracy in mimicking exhaust gas changes.
Innovation Solution
A simulated gas supply apparatus comprising multiple raw gas sources, flow controller groups, a switching valve system, and a controlling unit that adjusts flow rates and valve operations to stabilize and sequentially supply simulated gas with precise concentrations and flow rates, ensuring accurate simulation of exhaust gas changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flow rates of raw gases are changed to adjust simulated gas concentration, then the concentration of simulated gas can be adjusted, but the flow rates fluctuate and take several seconds to stabilize, reducing measurement precision
Solution Approach 1:
The system pre-calculates and stores the required flow rates for each raw gas source based on the target simulated gas concentration before actual operation. When concentration adjustment is needed, the system retrieves pre-computed flow rate settings rather than calculating in real-time, eliminating computational delay and enabling immediate stabilization.
Solution Approach 2:
The patent replaces manual or mechanical flow rate adjustment mechanisms with an automated control system that uses pre-stored flow rate data. This substitution eliminates the lag associated with mechanical adjustment and allows for precise, instantaneous flow rate changes without stabilization delays.
2Measurement precision
If the flow rates of raw gases are changed to adjust simulated gas concentration, then the concentration can be adjusted, but the pressure in flow pipes changes affecting remaining raw gases, reducing reliability
Solution Approach 1:
The system divides the gas supply into multiple independent channels, each controlled by its own flow controller. This segmentation allows each raw gas to be adjusted independently without affecting the pressure and flow of other gases, eliminating the coupling effect that causes instability in the mixed simulated gas.
Solution Approach 2:
The control system continuously monitors the actual flow rates and concentrations of raw gases and simulated gas, comparing them with target values. When deviations are detected, the system automatically adjusts flow rates to maintain stability, ensuring reliable and consistent simulated gas supply despite individual flow rate changes.
3Manufacturing precision
If multiple raw gas flow rates are changed simultaneously, then the simulated gas concentration can be adjusted, but the different stabilization times of each gas make it difficult to achieve high accuracy, reducing manufacturing precision
Solution Approach 1:
The system pre-calculates the required flow rates for each raw gas source based on the target simulated gas concentration and stores these values before operation. This eliminates the need for complex real-time coordination of multiple flow rates, as all adjustments are based on pre-determined settings that account for individual gas stabilization characteristics.
Solution Approach 2:
The patent changes the control parameter from simultaneous flow rate adjustment to sequential or independent adjustment based on pre-stored values. Each raw gas flow rate is set according to its specific stabilization time characteristics, allowing the system to achieve accurate mixed gas concentration without complex coordination mechanisms.
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 apparatus effectively stabilizes and sequentially supplies simulated gas with predetermined concentrations and flow rates, improving the accuracy of catalyst and sensor evaluation tests by mimicking exhaust gas conditions more reliably.
Implementation Method 1
a plurality of flow controller groups each of which is constituted of a plurality of flow controllers, each of the flow controllers being provided for each of the raw gas sources so as to control flow rates of each of the raw gas sources
Implementation Method 2
a switching valve system constituted of a plurality of switching valves each of which is provided for each of the flow controller groups so as to switch the simulated gas flow between the primary supply pipe and the primary exhaust pipe
Data Source
AI summary
A simulated gas supply apparatus includes a raw gas source group including a plurality of raw gas sources, a plurality of flow controller groups, each of which includes a plurality of flow controllers, a flow control system including the flow controller groups, a primary supply pipe for supplying a simulated gas to an evaluation device, a primary exhaust pipe for exhausting the simulated gas, a switching valve system including a plurality of switching valves so as to switch the simulated gas flow between the primary supply pipe and the primary exhaust pipe, and a controlling unit that controls the flow control system and the switching valve system.