Gas sampling method and dilution tunnel therefor

Details Gas sampling method and dilution tunnel therefor Gas sampling method and dilution tunnel therefor

1994-03-28

1995-09-19

Chilcot, Jr., Richard E.

Measuring and testing

Vehicle chassis

Steering

73 2332, G01M 1500

Patent

active

054507499

ABSTRACT:
Emission gasses from an engine exhaust pipe are collected through an inlet of a dilution tunnel which is an elongated, hollow tube. The inlet is spaced from the exhaust pipe to also admit surrounding air. Ambient air and emissions are mixed in the tunnel by a screen in the tunnel. A probe in the tunnel diverts a portion of the mixture to gas analyzers. Prior to analysis the mixture may be condensed, filtered or otherwise processed. The analysis determines a CO/CO.sub.2 ratio which is used to determine the air/fuel ratio in the engine based on characteristics of the fuel. The air/fuel mixture of the engine is then adjusted to achieve desired performance.

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patent: 5231864 (1993-08-01), Ishida et al.
patent: 5255554 (1993-10-01), Mallebrein et al.

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