This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Comparison of Homogeneous, Stratified and High-Squish Stratified Combustion in a Direct-Injected Two-Stroke Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 09, 2008 by SAE International in United States
Annotation ability available
Gasoline direct injection (GDI) two-stroke engine technology has been developed for use in snowmobile applications. Applying GDI to a two-stroke engine significantly reduces emissions of unburned hydrocarbons and improves fuel economy by reducing the short circuiting of fuel that occurs in conventional carbureted two-stroke engines. The GDI design allows for two different modes of combustion, stratified and homogeneous. Stratified combustion is typically used during idle and light to moderate loads at low engine speeds while homogeneous combustion is used at moderate to high loads and medium to high engine speeds. This work presents the process and results of determining which mode of combustion provides better fuel economy during cruise point operation, and where the transition from stratified to homogeneous combustion should occur in snowmobile operation. Results are also presented regarding the effects of increased squish velocity on the brake specific fuel consumption and torque output during stratified operation. Results show that homogeneous calibration is the superior mode of combustion for the cruise points of a snowmobile.
CitationJohnson, J. and Den Braven, K., "Comparison of Homogeneous, Stratified and High-Squish Stratified Combustion in a Direct-Injected Two-Stroke Engine," SAE Technical Paper 2008-32-0030, 2008, https://doi.org/10.4271/2008-32-0030.
- Morikawa, K. Takimoto H. Ogi T. “A Study of Direct Fuel Injection Two-Stroke Engine for High Specific Power Output and High Engine Speed,” Society of Automotive Engineers SAE 1999-01-3288 /JSAE 9938043 1999
- Johnson, J. “Comparison of Stratified and Homogeneous Combustion in a Direct-Injected Two-Stroke Engine for Snowmobile Applications,” University of Idaho 2007
- Heywood J.B. Internal Combustion Engine Fundamentals McGraw Hill, Inc. 1988
- Bradbury, N. “Retrofitting Direct-Injection and a Turbocharger to a Two-Stroke Engine for Snowmobile Applications,” University of Idaho 2006
- Zhao, F. Harrington, D. Lai, M. Automotive Gasoline Direct-Injection Engines Society of Automotive Engineers, Inc. Warrendale, Pa. 2002
- Bombardier Recreational Products Waukegan, IL 2007
- Strauss, S. Zeng, Y. Montgomery, D. “Optimization of the E-TEC TM Combustion System for Direct-Injection Two-Stroke Engines Toward 3-Star Emissions,” Society of Automotive Engineers SAE 2003-32-0007 /20034307 2003
- Moriyoshi, Y. Mori, K. “Mixture Formation Analysis of a Schnurle-Type Two-Stroke Gasoline DI Engine,” Society of Automotive Engineers SAE 2001-01-1091 2001
- Harker, N. et al. “University of Idaho's Clean Snowmobile Design Using a Direct-Injection Two-Stroke Engine,” Society of Automotive Engineers SAE 08SETC-0006 2008
- Strauss, S. Zeng, Y. “The Effect of Fuel Spray Momentum on Performance and Emissions of Direct-Injected Two-Stroke Engines,” Society of Automotive Engineers SAE 2004-32-0013 /20044300 2004
- Blair G.P. Design and Simulation of Two-Stroke Engines Society of Automotive Engineers, Inc. Warrendale, Pa 1996
- Stone, R. Introduction to Internal Combustion Engines Antony Rowe Ltd. Chippenham, Wiltshire 1997