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Effect of Variable Valve Timing on Diesel Combustion Characteristics
Technical Paper
2010-01-1124
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper investigates the effects of variable valve actuation on combustion in a Diesel engine. Early inlet valve closing (EIVC) lowered the pressure and temperature during the compression stroke, resulting in a longer ignition delay as the fuel mixed more homogenously with the charge air ahead of combustion. Combustion was characterized by prominent cool flame chemistry and a faster, more energetic, premixed combustion. Tests were performed on a 6.4L V8 engine at loads up to 5 bar BMEP. The use of EIVC showed significant reductions of soot (above 90%) and fuel efficiency improvements (of 5%) with NOx levels below the US 2010 standard of 0.2g/bhp-hr. The improvements in emissions and fuel economy came from controlling in-cylinder temperatures and optimizing combustion phasing. For a constant engine-out NOx emission, EIVC improved fuel economy as the amount of EGR and the engine back pressure requirement were reduced.
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De Ojeda, W., "Effect of Variable Valve Timing on Diesel Combustion Characteristics," SAE Technical Paper 2010-01-1124, 2010, https://doi.org/10.4271/2010-01-1124.Also In
References
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