This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Mixture Preparation for Direct-Injection SI Engines
Annotation ability available
Sector:
Language:
English
Abstract
Meeting future exhaust emission and fuel consumption standards tor passenger cars will require refinements in how the combustion process is carried out in spark ignition engines. A direct injection system decrease fuel consumption under road load cruising conditions, and stratified charge of the fuel mixture is particularly effective for ultra lean combustion. To achieve stable combustion at an ultra lean air fuel ratio, fuel spray speed, angle, droplet diameter and in-cylinder air behavior must be optimized.
In this paper, the engine system which has an injector and spark plug located in the center of combustion chamber, and has a flat type piston was investigated. We adopted a swirl type injector (fuel pressure 5MPa) which gave a droplet diameter of 20 μ m. Swirl air motion was applied in the cylinder to concentrate the fuel mixture at its cylinder center. Fuel spray speed was decreased to under 30m/s to keep the mixture at the top of the cylinder. We achieved a lean limit air fuel ratio of about 40 using the flat type piston.
Authors
Topic
Citation
Ohsuga, M., Shiraishi, T., Nogi, T., Nakayama, Y. et al., "Mixture Preparation for Direct-Injection SI Engines," SAE Technical Paper 970542, 1997, https://doi.org/10.4271/970542.Also In
References
- Kume T. et al. Combustion Control Technologies for Direct Injection SI Engine SAE Paper No. 960600
- Kono S. et al. Development of the Stratified Charge and Stable Combustion Method in DI Gasoline Engines SAE Paper No. 950688
- Iriya Y. et al. Engine Performance and The Effects of Fuel Spray Characteristics on Direct Injection S.I. Engines '96 Autumn Conference of the Society of Automotive Engineers of Japan 1 1996-10
- Matsushita S. et al. Mixture Formation Process and Combustion Process of Direct Injection S.I. Engine '96 Autumn Conference of the Society of Automotive Engineers of Japan 1996-10
- Shiraishi T. et al. A Study of the Mixture Preparation Process on Spark Ignited, Direct Injection Engine SAE IPC-8 Paper No.9530409
- Fujieda M. et al. Influence of the Spray Pattern on Combustion Characteristics in a Direct Injection Engine '96 Spring Conference of the Society of Automotive Engineers of Japan 1996-5
- Anderson R.W. et al. Understanding the Thermodynamics of Direct Injection Spark Ignition (DISI) Combustion Systems: An Analytical and Experimental Investigation SAE Paper No. 962018
- Shimotani K. et al. Characteristics of Exhaust Emission on Gasoline In-Cylinder Direct Injection Engine 13th Symposium of Internal Combustion Engines Japan 1996-6
- Karl G. et al Thermodynamic Analysis of a Stratified Direct Injected Gasoline Engine VDI 17th International Wiener Motorensymposium 1996-4
- Stutzenberger H. et al. Gasoline Direct Injection for S.I. Engines- Development Status and Outlook VDI 17th international Wiener Motorensympsium 67 1996-4
- Fansler T.D. et al. Fuel Distributions in a Firing Direct-Injection Spark-Ignition Engine Using Laser-Induced Fluorescence Imaging SAE Paper No. 950110
- Fraidl G.K. et al. Gasoline Direct Injection: Actual Trends and Future Strategies for Injection and Combustion System SAE Paper No. 960465