Patent ID: 9518897
Filing Date: 2016-12-13
CPC Classification: G01M,G01N

Claim Text:
1. An exhaust sampling system for an engine, the exhaust sampling system comprising: a dilution tunnel in which exhaust gas from the engine is diluted with a first diluent gas; an exhaust collection unit including at least one collection bag that selectively receives said diluted exhaust gas; a first sample probe in fluid communication with said dilution tunnel and operable to selectively supply said at least one collection bag with a portion of said diluted exhaust gas during a test phase; and a controller operable to permit flow of said diluted exhaust gas from said first sample probe to said at least one collection bag in a first state and operable to prevent flow of said diluted exhaust gas from said first sample probe to said at least one collection bag in a second state, said controller selectively supplying a second diluent gas to said at least one collection bag during said test phase and selectively preventing flow of said second diluent gas to said at least one collection bag during said test phase.