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.

• Record URL:
  https://doi.org/10.1504/IJPT.2012.049630
• Record URL:
  http://inderscience.metapress.com/link.asp?target=contribution&id=M112358821333U41
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/17424267
• Supplemental Notes:
  • Copyright © 2012 Inderscience Enterprises Ltd.
• Authors:
  • Karnik, Amey Y
  • Jankovic, Mrdjan J
  • Shelby, Michael H
• Publication Date: 2012

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 420-437
• Serial:
  • International Journal of Powertrains
  • Volume: 1
  • Issue Number: 4
  • Publisher: Inderscience Enterprises Limited
  • ISSN: 1742-4267
  • EISSN: 1742-4275
  • Serial URL: https://www.inderscience.com/jhome.php?jcode=ijpt

Subject/Index Terms

• TRT Terms: Engine performance; Gasoline engines; Power trains; Turbochargers; Valve timing
• Subject Areas: Highways; Vehicles and Equipment; I91: Vehicle Design and Safety;

Filing Info

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