Fuel Injection Strategies to Improve Emissions and Efficiency of High Compression Ratio Diesel Engines

Event
Powertrains, Fuels and Lubricants Meeting
Authors Abstract
Content
Simultaneous low NOx (< 0.15 g/kWh) & soot (< 0.01 g/kWh) are attainable for enhanced premixed combustion that may lead to higher levels of hydrocarbons and carbon monoxide emissions as the engine cycles move to low temperature combustion, which is a departure from the ultra low hydrocarbon and carbon monoxide emissions, typical of the high compression ratio diesel engines. As a result, the fuel efficiency of such modes of combustion is also compromised (up to 5%). In this paper, advanced strategies for fuel injection are devised on a modern 4-cylinder common rail diesel engine modified for single cylinder research. Thermal efficiency comparisons are made between the low temperature combustion and the conventional diesel cycles. The fuel injection strategies include single injection with heavy EGR, and early multi-pulse fuel injection under low or medium engine loads respectively. The empirical studies have been conducted under independently controlled exhaust gas recirculation, intake boost, and exhaust backpressure. Multiple fuel injection pulses per cycle and heavy EGR have been applied to modulate the homogeneity history in order to improve the phasing and efficiency of the combustion process. The new low temperature combustion trade-off, that is, CO & THC vs. NOx & soot is presented in the context of the different fuel injection strategies.
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DOI
https://doi.org/10.4271/2008-01-2472
Pages
14
Citation
Asad, U., Zheng, M., Han, X., Reader, G. et al., "Fuel Injection Strategies to Improve Emissions and Efficiency of High Compression Ratio Diesel Engines," SAE Int. J. Engines. 1(1):1220-1233, 2009, https://doi.org/10.4271/2008-01-2472.
Additional Details
Publisher
Published
Oct 6, 2008
Product Code
2008-01-2472
Content Type
Journal Article
Language
English