This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effects of Variable Inlet Valve Timing and Swirl Ratio on Combustion and Emissions in a Heavy Duty Diesel Engine
Technical Paper
2012-01-1719
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In order to avoid the high CO and HC emissions associated with
low temperature when using high levels of EGR, partially premixed
combustion is an interesting possibility. One way to achieve this
combustion mode is to increase the ignition delay by adjusting the
inlet valve closing timing, and thus the effective compression
ratio.
The purpose of this study was to investigate experimentally the
possibilities of using late and early inlet valve closure to reduce
NOx emissions without increasing emissions of soot or
unburned hydrocarbons, or fuel consumption. The effect of
increasing the swirl number (from 0.2 to 2.5) was also
investigated. The combustion timing (CA50) was kept constant by
adjusting the start of injection and the possibilities of
optimizing combustion using EGR and high injection pressures were
investigated. Furthermore, the airflow was kept constant for a
given EGR level.
The engine used in the experiments was a single-cylinder
heavy-duty direct injection diesel engine equipped with an
electronically controlled unit injector with variable needle
opening pressure. Its geometry is based on the Volvo D12C
production engine with the compression ratio lowered from 18.5 to
17. The engine is also equipped with a fully flexible pneumatic
inlet valve system, enabling both early and late inlet valve
closing times and varied swirl levels.
The results show that late or early IVC can be used to achieve
partially premixed combustion (and thus low soot and NOx
emissions) without a fuel consumption penalty.
Recommended Content
Authors
Topic
Citation
Ehleskog, M., Gjirja, S., and Denbratt, I., "Effects of Variable Inlet Valve Timing and Swirl Ratio on Combustion and Emissions in a Heavy Duty Diesel Engine," SAE Technical Paper 2012-01-1719, 2012, https://doi.org/10.4271/2012-01-1719.Also In
References
- Huestis, E. Erickson, P. Musculus, M. “In-Cylinder and Exhaust Soot in Low-Temperature Combustion Using a Wide-Range of EGR in a Heavy-Duty Diesel Engine,” SAE Technical Paper 2007-01-4017 2007 10.4271/2007-01-4017
- Wang, Y. Zeng, S. Huang, J. He, Y. Huang, X. Lin, L. Li, S. “Experimental investigation of applying Miller Cycle to reduce NOx emissions from diesel engine” Proceedings of IMechE 219 Journal of Power and Energy 631 638 2005
- Benajes, J. Serrano, J.R Molina, S. Novella, R. “Potential of Atkinson cycle combined with egr for pollutant control in a HD diesel engine” Journal of Energy Conversion and Management 50 174 183 2009
- Benajes, J. Molina, S. Martín, J. Novella, R. “Effect of advancing the closing angle of the intake valves on diffusion- controlled combustion in a HD diesel engine” Applied Thermal Engineering 29 1947 1954 2009
- De Ojeda, W. “Effect of Variable Valve Timing on Diesel Combustion Characteristics,” SAE Technical Paper 2010-01-1124 2010 10.4271/2010-01-1124
- Murata, Y. Kawano, D. Kusaka, J. Daisho, Y. Suzuki, H. Ishii, H. Goto, Y. Odaka, M. “Potential of emissions reduction by premixed diesel combustion with variable valve timing” Review of Automotive Engineering 27 379 386 SAE of Japan 2006
- 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 10.4271/2006-01-0203
- Murata, Y. Kusaka, J. Daisho, Y. Kawano, D. et al. “Miller-PCCI Combustion in an HSDI Diesel Engine with VVT,” SAE Int. J. Engines 1 1 444 456 2009 10.4271/2008-01-0644
- He, X. Durrett, R. Sun, Z. “Late Intake Valve Closing as an Emissions Control Strategy at Tier 2 Bin 5 Engine-Out NOx Level,” SAE Int. J. Engines 1 1 427 443 2009 10.4271/2008-01-0637
- Alriksson, M. Rente, T. Denbratt, I. “Low Soot, Low NOx in a Heavy Duty Diesel Engine Using High Levels of EGR,” SAE Technical Paper 2005-01-3836 2005 10.4271/2005-01-3836
- Heywood, J.B. “Internal Combustion Engine Fundamentals” McGraw-Hill book company 1988
- Woschni, G. “A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,” SAE Technical Paper 670931 1967 10.4271/670931
- Trajkovic, S. Milosavljevic, A. Tunestål, P. Johansson, B. “FPGA Controlled Pneumatic Variable Valve Actuation,” SAE Technical Paper 2006-01-0041 2006 10.4271/2006-01-0041
- Ma, J. Schock, H. Carlson, U. Hoglund, A. et al. “Analysis and Modeling of an Electronically Controlled Pneumatic Hydraulic Valve for an Automotive Engine,” SAE Technical Paper 2006-01-0042 2006 10.4271/2006-01-0042
- Dec, J. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging*,” SAE Technical Paper 970873 1997 10.4271/970873