CVS SYSTEM SAMPLE WATER VAPOR MANAGEMENT
First Claim
1. An engine emissions test system comprising:
- a tunnel configured to receive exhaust from an engine;
a sampler configured to extract a sample of exhaust from the tunnel;
at least one sample bag configured to store the sample of exhaust;
a bag fill circuit configured to communicate the sample of exhaust between the sampler and the at least one sample bag, the bag fill circuit including a pump and a flow meter; and
a fill gas line configured to communicate a fill gas from a fill gas source to the bag fill circuit dep;
(at a point between the flow meter of the bag fill circuit and the at least one sample bag).
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Accused Products
Abstract
An exhaust sampling system includes a pre-fill gas source having a pre-fill gas. A sampling conduit is configured to collect exhaust gas and make-up gas. A sample bag is fluidly connected to the sampling conduit and the pre-fill gas source. A controller is programmed to run a test procedure in which a sample of exhaust gas and make-up gas is collected in the sample bag. The controller sends a command that fills the sample bag with pre-fill gas prior to the test procedure. The pre-fill gas remains in the sample bag during the test procedure. In one example, the amount of pre-fill gas is selected to prevent the sample from condensing in the sample bag during the test procedure. In another example, the amount of pre-fill gas is selected to provide a sufficient volume of gases for analysis during the test procedure.
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Citations
16 Claims
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1. An engine emissions test system comprising:
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a tunnel configured to receive exhaust from an engine; a sampler configured to extract a sample of exhaust from the tunnel; at least one sample bag configured to store the sample of exhaust; a bag fill circuit configured to communicate the sample of exhaust between the sampler and the at least one sample bag, the bag fill circuit including a pump and a flow meter; and a fill gas line configured to communicate a fill gas from a fill gas source to the bag fill circuit dep;
(at a point between the flow meter of the bag fill circuit and the at least one sample bag). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An engine emissions test system comprising:
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a tunnel configured to receive exhaust from an engine; at least one sample bag configured to store a sample of exhaust; an read circuit configured to communicate the stored exhaust sample between the at least one sample bag and an analyzer; and a fill gas line configured to communicate a fill gas to be mixed with the exhaust sample, the fill gas line extending between a fill gas source and the read circuit. - View Dependent Claims (13, 14, 15, 16)
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Specification