Achievement of Medium Engine Speed and Load Premixed Diesel Combustion with Variable Valve Timing

2006-01-0203

04/03/2006

Event
SAE 2006 World Congress & Exhibition
Authors Abstract
Content
A variable valve timing (VVT) mechanism was applied to achieve premixed diesel combustion at higher load for low emissions and high thermal efficiency in a light duty diesel engine. By means of late intake valve closing (LIVC), compressed gas temperatures near the top dead center are lowered, thereby preventing too early ignition and increasing ignition delay to enhance fuel-air mixing. The variability of effective compression ratio has significant potential for ignition timing control of conventional diesel fuel mixtures. At the same time, the expansion ratio is kept constant to ensure thermal efficiency. Combining the control of LIVC, EGR, supercharging systems and high-pressure fuel injection equipment can simultaneously reduce NOx and smoke. The NOx and smoke suppression mechanism in the premixed diesel combustion was analyzed using the 3D-CFD code combined with detailed chemistry. LIVC can achieve a significant NOx and smoke reduction due to lowering combustion temperatures (LTC: Low Temperature Combustion) and avoiding local over-rich regions in the mixtures, respectively.
Meta TagsDetails
DOI
https://doi.org/10.4271/2006-01-0203
Pages
13
Citation
Murata, Y., Kusaka, J., Odaka, M., Daisho, Y. et al., "Achievement of Medium Engine Speed and Load Premixed Diesel Combustion with Variable Valve Timing," SAE Technical Paper 2006-01-0203, 2006, https://doi.org/10.4271/2006-01-0203.
Additional Details
Publisher
Published
Apr 3, 2006
Product Code
2006-01-0203
Content Type
Technical Paper
Language
English