Experimental studies on low pressure semi-direct fuel injection in a two stroke spark ignition engine |
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| Authors: | M Loganathan A Ramesh |
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| Institution: | (1) Department of Mechanical Engineering, Annamalai University, Annamalai Nagar, 608002, India;(2) Internal Combustion Engines Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036, India |
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| Abstract: | In this work a two-stroke scooter engine was modified to work with semi-direct injection of gasoline at a pressure of 8 bar
from an injector in the cylinder barrel pointed toward the cylinder head. The influence of injection timing, injection pressure,
spark plug location and air-fuel ratio, on performance, emissions and combustion characteristics has been investigated. In
addition, a comparison has been made with manifold injection of gasoline on the same engine at a given speed and various outputs.
A significant reduction in HC emissions and fuel consumption with no adverse effects on NOx emissions and combustion stability
was observed. A small drop in power and increase in CO emission were observed disadvantages of the new injection system. Injection
timing was found to be the most important factor and a balance between reduction in shortcircuited fuel by late injection,
and time for mixture preparation by advancing the injection, was found to be essential. |
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| Keywords: | Two stroke engines Semi-direct injection Emission control Fuel Injection |
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