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Fuel Consumption and Emission Reduction of a Small Two-Stroke Engine Through Air-Assisted Fuel Injection and Delayed-Charging
Technical Paper
1999-01-1247
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The classical small two-stroke engine is mechanically simple with a high power-to-weight ratio. But direct fuel losses are high and therefore induce a high fuel consumption and an unacceptable pollution level. We have developed a simple device (named Delayed-Charging) which is able to largely reduce fuel losses by almost separating the scavenging and fuel-charging functions and, consequently, retaining the major part of delivered fuel in the cylinder. Recent improvements, by use of an air-assisted injection combined with an air curtain to deviate the fuel spray trajectory throughout the cylinder, lead to a further reduction of hydrocarbon emission level from 4% (FIDHC methane equivalent) in a standard carbureted engine down to a 1% level associated to a fuel consumption reduction within a larger speed range in our newly modified 50 cc engine.
To better understand the behavior of the fuel flow, a local instantaneous fuel-concentration measurement in the exhaust duct by a continuous Laser Induced Fluorescence (LIF) process (with a Argon Laser beam) is associated to the continuous mean measurement of HC emission, giving information on the fuel transport and utilization throughout the engine.
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Rochelle, P. and Perrard, W., "Fuel Consumption and Emission Reduction of a Small Two-Stroke Engine Through Air-Assisted Fuel Injection and Delayed-Charging," SAE Technical Paper 1999-01-1247, 1999, https://doi.org/10.4271/1999-01-1247.Also In
References
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