This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
COMPRESSION WAVE INJECTION: A MIXTURE INJECTION METHOD FOR TWO-STROKE ENGINES BASED ON UNSTEADY GAS DYNAMICS
Technical Paper
2001-01-1817
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This paper describes the fundamental principles of operation of a mixture injection system now called the Compression Wave Injection system (CWI). The system has been initially designed for use in handheld lawn and garden equipment but is also appropriate for use in other two stroke applications. The designed engines must demonstrate greatly reduced emissions of unburned hydrocarbon to attain present and future emission regulations. Because of the constraints of the market for the handheld products, the system was designed for low-cost production and adaptation to existing products. It was also required, from cost and operation considerations, that the system is capable of operating with fuel metering based on a carburetor.
The CWI system described utilizes a compression wave derived from the combustion process of a two-stroke engine to inject a rich mixture into the cylinder of the engine. The hot gases from the combustion process are used to partially vaporize the fuel charge prior to entry into the cylinder. Reflected compression wave behavior is utilized to aid in the preparation of the fuel charge and deliver the charge to the cylinder after the initiation of the scavenging behavior. By utilizing the Compression Wave Injection method; low-cost, carbureted engines can be produced that operate with well-vaporized delayed fuel entry into the cylinder in a similar fashion to direct-injected engines. Such engines display 30 percent improvement in brake specific fuel consumption and 70-85 percent reduction in emission of unburned hydrocarbon.
Recommended Content
Topic
Citation
Cobb, W., "COMPRESSION WAVE INJECTION: A MIXTURE INJECTION METHOD FOR TWO-STROKE ENGINES BASED ON UNSTEADY GAS DYNAMICS," SAE Technical Paper 2001-01-1817, 2001, https://doi.org/10.4271/2001-01-1817.Also In
References
- Marconi, P. Bimota S.P.A. TWO-STROKE FUEL-INJECTED INTERNAL COMBUSTION ENGINE Aug. 22 1995
- Laimbock, F. Klasnic, H. Grilic, S. Meister, G. Dorfstatter, M. “AVL SDIS Mk. II - Low Cost Automotive FI Applied to 2-Stroke Engines for Future CARB - Regulations” SAE 1999-01-3285
- Duret, P. Ecomard, M. Audinet, M. “A New Two-Stroke Engine with Compressed Air Assisted Fuel Injection for High Efficiency Low Emissions Applications” SAE 880176
- Dabadie, J-C. Duret, P-L. Venturi, S. “SCIP: A New Simplified Camless IAPAC Direct Injection for Low Emission Small Two Stroke Engines” SAE 972087
- Nuti, M. et al. “FAST Injection System: Piaggio Solution for ULEV 2T SI Engines” SAE 970362
- Nuti, M. Caponi, D. “The Development of a Propulsive Unit for a Friendly Individual Commuting Vehicle” 1999 SAE 1999-01-1246
- Ishibashi, Y. ASAI, M. NISHIDA, K. “An Experimental Study of Stratified Scavenging Activated Radical Combustion Engine” 1997 SAE 972077
- Gentili, R. Frigo, S. Tognotti, L. “Development of a Pumpless Air Assisted Injection System for Two-Cycle S.I. Engines” SAE 940397
- Gentili, R. Marini, A. “Pro-Ject Air-Assisted Fuel Injection System for Two-Stroke S.I. Engines” SAE 960360
- Blair, G. P. “Design and Simulation of Two-Stroke Engines” SAE 1-59091-685-0 1996
- Cunningham, G. Kee, R. Kenny, R. Skelton, W. “Development of a Stratified Scavenging System for Small Capacity Two-Stroke Engines” 1999 SAE 1999-01-3270
- McElligott, S. Douglas, R. Kee, R. Glover, S. “Stratified Scavenging Applied to a Small Capacity Two-Stroke Scooter for the Reduction of Fuel Consumption and Emissions” 1999 SAE 1999-01-3271
- McElligott, S. Douglas, R. Kenny, R. Glover, S. “An Assessment of a Stratified Scavenging Process Applied to a Loop Scavenged Two-Stroke Engine” 1999 SAE 1999-01-3272
- Sawada, T. Wada, M. Noguchi, M. Kobayashi, B. “A Study on Advanced Low Exhaust Emission Two-Stroke Engine” 1997 SAE 972114
- Yoshida, Y. Uenoyama, K. Kawahara, Y. Kudo, K. “Development of a Stratified Scavenging Two-Stroke Cycle Engine for Emission Reduction” 1999 SAE 1999-01-3269
- Douglas, R. “AFR and Emissions calculations for two-stroke cycle engines” SAE 901599