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In-Cylinder Gas Sampling of IC Engines Using Modified GDI Injectors~The CSV
Published May 18, 2005 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
Sampling of in-cylinder gas from operating IC engines offers potentially valuable information to automotive engineers. Though it has been demonstrated in the past that specialized high-speed sampling valves can be used to meet this need, the application has never become commonplace, due to cost and reliability issues. In this paper, a novel in-cylinder sampling technique is presented, using production GDI (Gasoline Direct Injection) injector as a very high speed, small and cheap sampling valve. Modifications to the standard injector are described, and a description of the mode of operation. Results from a gasoline and a diesel engine are presentd, both pre- and post-combustion, for the gases CO2, NO and uHC, using production high frequency response gas sensors, and also lambda, using a modified UEGO sensor. These results show how continuous cyclic measurements may be made in a routine way.