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Achievement of Medium Engine Speed and Load Premixed Diesel Combustion with Variable Valve Timing
Technical Paper
2006-01-0203
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Authors
- Yutaka Murata - Waseda University
- Jin Kusaka - Waseda University
- Matsuo Odaka - Waseda University
- Yasuhiro Daisho - Waseda University
- Daisuke Kawano - National Traffic Safety and Environment Laboratory (NTSEL)
- Hisakazu Suzuki - National Traffic Safety and Environment Laboratory (NTSEL)
- Hajime Ishii - National Traffic Safety and Environment Laboratory (NTSEL)
- Yuichi Goto - National Traffic Safety and Environment Laboratory (NTSEL)
Topic
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.Also In
Homogeneous Charge Compression Ignition (HCCI) Combustion 2006
Number: SP-2005; Published: 2006-04-03
Number: SP-2005; Published: 2006-04-03
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