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Development of Stratified Scavenging Two–Stroke Cycle Engine for Emission Reduction
Technical Paper
1999-01-3269
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper describes a stratified scavenging system of two–stroke cycle engine, developed to reduce HC (hydrocarbon) emission caused by short–circuiting mixture at scavenging process. The fact, the maximum short–circuiting of fuel–air mixture occurs at the timing soon after the scavenging port open, led us to the idea of stratified scavenging, that is, first stage of scavenging by air without fuel, then second stage by air–fuel mixture. The stratified scavenging system consists of long passages from crankcase to scavenging ports, and the supplemental air intake system directly to the scavenging port. The newly developed stratified scavenging two–stroke cycle engine cuts HC emission to about 1/4 of conventional two–stroke, and can meet the CARB Tier 2 emission regulation.
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Citation
Yoshida, Y., Uenoyama, K., Kawahara, Y., and Kudo, K., "Development of Stratified Scavenging Two–Stroke Cycle Engine for Emission Reduction," SAE Technical Paper 1999-01-3269, 1999, https://doi.org/10.4271/1999-01-3269.Also In
References
- Morishima R. Asai K. “Mixture Strength at Cranking Cycles of Gasoline Engine Starting” SAE 920235
- Blair G.P. Hill B.W. “Reduction of Fuel Consumption of a Spark–Igntion Two–Stroke Cycle Engine” SAE 830093
- Onishi Shigeru Jo Souk Hong “Multi–Layer Stratified Scavenging (MULS) –A New Scavenging Method for Two–Stroke Engine” SAE 840420
- Saxena Mukesh Mathur H.B. “A Stratified Charging Two–Stroke Engine for Reduction of Scavenged–Through Losses” SAE 891805
- Sawada T. Wada M. “Development of a Low Emission Two–Stroke Cycle Engine” SAE 980761
- “Crankcase Scavenging Two–Stroke Cycle Engine”