This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Description of the Shape of an Air-fuel Mixture and Determination of Injection Advance Angles Related to the Spark Discharges in a Gasoline Direct Injection Engine
Annotation ability available
Sector:
Language:
English
Abstract
This paper analyses the shape of the air-fuel mixture in the latest version of an internal combustion engine (gasoline direct injection GDI). In this type of an engine there is an ultra-lean combustion mode where the fuel injection occurs at the compression stroke. An ignition occurs at an ultra-lean air-fuel ratio of 30 to 40 even 55 including exhaust gas recirculation. This mode of combustion of the stratified mixture decreases fuel consumption by around 35% and even 40% during idling. This gasoline engine becomes as efficient as a Diesel engine.
The problem considered is the shaping of the air-fuel mixture in such an engine where the injector is situated at an angle to the axis of a curved piston.
The analysis in this paper includes the following parameters: the diameter of the opening and the angle of the injector, the pressure of the injected fuel, the shape of the surface of the curved piston, the speed of the piston as a function of the crank angle, and dimensions of an engine.
The aim of the mathematical model developed is to find the injection advance angle needed for the core of the rich mixture to reach the igniting spark.
Authors
Topic
Citation
Sendyka, B., "A Description of the Shape of an Air-fuel Mixture and Determination of Injection Advance Angles Related to the Spark Discharges in a Gasoline Direct Injection Engine," SAE Technical Paper 980496, 1998, https://doi.org/10.4271/980496.Also In
References
- Lyszewskij A. 1971 Sankt Petersburg, Russia
- Orzechowski Z. Prywer J. Warsaw 1994 Poland
- Yamaguchi Jack “Mitsubushi DI gasoline engine prototype” Automotive Engineering SAE September 1995 25 29 USA
- Karl G. “Analysis of a Direct Injected Gasoline Engine” SAE 970624 International Congress & Exposition Feb 1997 USA
- Tomoda T. “Development of Direct Injection Gasoline Engine - Study of Stratified Mixture Formation” SAE 970539 International Congress & Exposition Feb 1997 USA
- Han Z. “Effects of Injection Timing on Air-Fuel Mixing in a Direct-Injection Spark-Ignition Engine” SAE 970625 International Congress & Exposition Feb 1997 USA
- Kume T. “ Combustion Control Technologies for Direct Injection SI Engine” SAE 960600 International Congress & Exposition Feb 1996 USA
- Ohsuga M. “Mixture Preparation for Direct-Injection SI Engines” SAE 970542 International Congress & Exposition Feb 1997 USA
- Harada J. “Development of Direct Injection Gasoline Engine” SAE 970540 International Congress & Exposition Feb 1997 USA
- Nuti M. “Fast Injection System: PIAGGIO Solution for ULEV 2T SI Engines” SAE 970362 International Congress & Exposition Feb 1997 USA
- Iwamoto Y. “Development of Gasoline Direct Injection Engin” SAE 970541 International Congress & Exposition Feb 1997 USA
- Meyer J. “Spray Visualisation of Air-Assisted Fuel Injection Nozzles foe Direct Injection SI-Engines” SAE 970623 International Congress & Exposition Feb 1997 USA
- Zhao F. “A Review of Mixture Preparation and Combustion Control Strategies for Spark-Ignited Direct-SAE 970627 Injection Gasoline Engines” International Congress & Exposition Feb 1997 USA