Filter Bleeding Measurement Arrangement for Pressure-Neutral Emission Detection
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Solution Overview
Problem
Existing methods fail to precisely differentiate between hydrocarbon emissions from motor vehicle tank leakages and those emitted by the fuel vapor filter, and they often interfere with the measurement process by introducing pressure changes.
Innovation Solution
A filter bleeding measurement arrangement using a flame ionization detector with a measurement adapter that includes separate connections for the fuel vapor filter, detector, and air inlet, allowing for pressure-neutral measurement of hydrocarbon emissions by directing most of the gas sucked up through the air inlet and a minimal amount through the measurement connection, ensuring that hydrocarbon vapors are detected passively and without pressure influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a flame ionization detector is directly connected to the fuel vapor filter, then hydrocarbon emissions can be detected, but pressure changes interfere with the measurement accuracy
Solution Approach 1:
A measurement adapter is introduced as an intermediary component between the fuel vapor filter and the flame ionization detector. The adapter includes a measurement connection for the filter, a detector connection for the detector, and an air inlet connection to the external atmosphere, creating a pressure-neutral measurement environment that eliminates pressure interference while maintaining measurement accuracy
Solution Approach 2:
The measurement system is segmented into separate functional connections: a measurement connection for the fuel vapor filter, a separate detector connection for the flame ionization detector, and an air inlet connection to the external atmosphere. This segmentation allows the detector to operate pressure-neutrally while still measuring filter emissions accurately
2Measurement precision
If the detector sucks up measurement gas directly from the filter, then emissions can be detected, but the detector's gas consumption affects the measurement result
Solution Approach 1:
The measurement adapter serves as a mediator that decouples the detector's gas consumption from the filter's emission output. The air inlet connection provides the majority of gas flow to the detector, while the measurement connection captures filter emissions passively without being affected by the detector's suction demand
Solution Approach 2:
The gas flow path is segmented into two sources: atmospheric air through the air inlet connection and filter emissions through the measurement connection. This segmentation ensures that the detector receives sufficient gas flow from the air inlet while measuring the filter's emission quantity accurately through the separate measurement connection
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
Enables precise and pressure-free measurement of fuel vapor emissions from the fuel vapor filter, allowing for accurate differentiation between tank and filter emissions, reducing measurement interference and ensuring reliable data collection.
Implementation Method 1
a flame ionization detector with a gas inlet and a gas outlet
Data Source
AI summary
A filter bleeding measurement arrangement for the pressure-neutral determination of the fuel vapor emissions of a fuel vapor filter includes a flame ionization detector with a gas inlet and a gas outlet, and a measurement adapter including a measurement connection for connection of the fuel vapor filter, a separate detector connection for connection of the flame ionization detector, and an air inlet fluidically connected to an external atmosphere.