Scavenging in a turbocharged gasoline engine

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.


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  • Accession Number: 01493215
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 19 2013 12:16PM