This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Stratified Charging Two-Stroke Engine for Reduction of Scavenged-Through Losses
Annotation ability available
Sector:
Language:
English
Abstract
Svavenged-through losses of fresh charge in two-stroke engines are known to be the major causes for high specific fuel consumption (sfc) and hydrocarbon (HC) emissions. This paper describes one of the concepts of stratified-charging in which initial charging is carried out by air or leaner mixtures, and this is followed by rich mixtures. The distinguishing feature of the concept is that the loss-contribution of the initial fractions of incoming charge is higher, which consists more of air. For this, a practical dual-intake system was developed. The experimental evaluation showed that the sfc and HC of the new engine version were consistently lower, however, the level of reduction depended upon the flow-ratio of the two circuits of the dual-intake system and the load. It did not practically depend upon the trapped air-fuel ratio.
Authors
Citation
Saxena, M., Mathur, H., and Radzimirski, S., "A Stratified Charging Two-Stroke Engine for Reduction of Scavenged-Through Losses," SAE Technical Paper 891805, 1989, https://doi.org/10.4271/891805.Also In
References
- Davis, C.W. “Fuel Injection and Positive Ignition: A Basis for improved Efficiency and Economy” SAE Trans. 69 120 1961
- Yamagishi, G. Sato, T. Twasa, H. “A Study of Two-Stroke Cycle Petrol Injection Engine for Exhaust Gas Purification” SAE Paper No. 720195
- Vieilledent, E. “Low Pressure Electronic Fuel Injection System for Two-Stroke Engines” SAE Paper No. 780767
- Yui, S. Ohinishi, S. “New Concept of Stratified Charge Two-Stroke Engine Yui and Ohinishi Combustion Process (YOCP)” SAE Paper No. 690468
- Kataoka, K. Hiraki, Y. “Improvement of Combustion and Clean Exhaust Gas of a Two-Cycle Gasoline Engine With Charge Stratification” Inst. Mech. Engg. C 93/75 113 118
- “Pneumatic Fuel Injection Spurs Two-Stroke Revival” Automotive Engineering 8 1988 94 74
- Duret, P. Ecomard, A. Audinet, M. “A New Two-Stroke Engine with Compressed-Air Assisted Fuel Injection for High Efficiency Low Emissions Applications” SAE Paper No. 880176
- Batoni, G. “An Investigation into the Future of Two-Stroke Motorcycle Engine” SAE Paper No. 780710
- Blair, G.P. Hill, B.W. Miller, A.J. Nickell, S.P. “Reduction of Fuel Consumption of a Spark Ignition Two-Stroke Cycle Engine” SAE Paper No. 830093
- Ohinishi, S. Sonk Hong JO Pan Do Jo Kato, SA. “Multilayer Stratified Scavenging (MULS) -A New Scavenging Method for Two-Stroke Engine” SAE Paper No. 840420
- Saxena, M. Kumar, R. Radzimirski, S. “Reduction of Mixture Short-Circuiting in Two-Stroke S. I. Engines: A Novel Design of Intake System” Paper No. B-6 IX NCICEC, IIP Dehradun, India Nov. 1985
- Ramesh A. Raja Rao S. Nagalingam, B. Gopalakrishnan, K.V. “A New Approach to Improve the Performance and Emissions of a Two-Stroke SI Engine” Paper No. B-1