The residual gas fraction was measured in an air-cooled single-cylinder utility engine by directly sampling the trapped cylinder charge during a programmed misfire. Tests were performed for a range of fuel mixture preparation systems, cam timings, ignition timings, engine speeds and engine loads. The residual fraction was found to be relatively insensitive to the fuel mixture preparation system, but was, to a moderate degree, sensitive to the ignition timing. The residual fraction was found to be strongly affected by the amount of valve overlap and engine speed. The effects of engine speed and ignition timing were, in part, due to the in-cylinder conditions at EVO, with lower temperatures favoring higher residual fractions. The data were compared to existing literature models, all of which were found to be lacking. The effect of the threshold value used to define lift was investigated, and a modified form of the Yun and Mirsky correlation, which was relatively insensitive to lift threshold, was proposed.
Residual Gas Measurements in a Utility Engine
Sae Technical Papers
Small Engine Technology Conference & Exposition ; 2004
2004-09-27
Conference paper
English
Residual Gas Measurements in a Utility Engine
British Library Conference Proceedings | 2004
|Fit control for utility engine
Automotive engineering | 1999
|Fit Control for Utility Engine
SAE Technical Papers | 1999
|In-Cylinder Measurements of Residual Gas Concentration in a Spark Ignition Engine
SAE Technical Papers | 1990
|In-cylinder measurements of residual gas concentration in a spark ignition engine
Automotive engineering | 1990
|