Scavenging in a turbocharged gasoline engine
by Amey Y. Karnik; Mrdjan J. Jankovic; Michael H. Shelby
International Journal of Powertrains (IJPT), Vol. 1, No. 4, 2012

Abstract: The phenomenon of air escaping the engine intake directly to the exhaust during valve overlap is commonly known as scavenging. This phenomenon is primarily observed at low-speed, high-load in engines with significant overlap between intake valve opening and exhaust valve closing. Evaluation on a turbocharged-gasoline engine shows increased low-speed torque when operating under scavenging conditions. This paper investigates the occurrence of scavenging and analyzes its consequences. A methodology is presented to infer the amount of scavenging using airflow and in-cylinder pressure measurements. Scavenging increases catalyst exotherm when operating with stoichiometric exhaust. A model is proposed to predict the additional exotherm.

Online publication date: Fri, 05-Dec-2014

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