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Development and Testing of a Novel Direct Mixture Injection System for a Two Stroke SI Engine
Technical Paper
2008-32-0077
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In this work a novel mixture injection system has been developed and tested on a two stroke scooter engine. This system admits finely atomized gasoline directly into the combustion chamber. It employs many components that were individually developed, fabricated, tested and then coupled together. A small compressor driven by the engine sends pressurized air at the correct crank angle through a timing valve. This is connected to a mechanical injector through a high pressure pipe. Fuel is metered into the high pressure pipe using a standard low pressure injector. The developed mixture injection system resulted in considerable improvements in thermal efficiency and reduction in HC emissions over the manifold injection method at all engine outputs. A considerable reduction in short circuiting losses was seen. The highest brake thermal efficiency achieved was 25.5% as against 23% with the manifold injection system. The minimum HC level is 460 ppm where as for manifold injection it is 1360 ppm. Better combustion with the developed system lead to a small increase in the peak NO level as compared to the manifold injection system. Further improvements are possible by redesigning the compressor and combustion chamber.
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Citation
Loganathan, M. and Ramesh, A., "Development and Testing of a Novel Direct Mixture Injection System for a Two Stroke SI Engine," SAE Technical Paper 2008-32-0077, 2008, https://doi.org/10.4271/2008-32-0077.Also In
References
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