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A Study on the Effect of Valve Timing on the Combustion and Emission Characteristics for a 4-cylinder PCCI Diesel Engine

Authors: Joonsup Han, Jaehyeon Lee, Hyungmin Kim, Kihyung Lee


PCCI engines can reduce NOx and PM emissions simultaneously without sacrificing thermal efficiency, but a low combustion temperature resulting from early fuel injection, and ignition occurring prior to TDC, can cause higher THC and CO emissions and fuel consumption. In conclusion, it was found that the PCCI combustion achieved by the 2-stage injection strategy with optimized calibration factors (e.g. EGR rate, injection pressure, swirl ratio, intake pressure, injection timing) can reduce NOx and PM emissions simultaneously. This research works are expected to provide valuable information conducive to a development of an innovative combustion engine that can fulfill upcoming stringent emission standards.

Keywords: Atkinson cycle, Diesel Engine, LIVC (Late intakevalve closing), PCCI (premixed charge compression ignition)

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[1] Bression, G., Soleri, D., Savy, S., Dehoux, S., Azoulay, D., Hamouda, H., Doradoux, L., Guerrassi, N., Lawrence, N., "A study of methods to lower HC and CO emissions in diesel HCCI", SAE 2008-01-0034, 2008.
[2] Ryu, J. D., Kim, H. M., Lee, K. H., Cho, H. M., "A study on the spray structure and evaporation characteristic of common rail type high pressure injector in homogeneous charge compression ignition engine", The 9th Annual Conference ILASS-Asia, 2004.
[3] Yun, H., Sellnau, M., Milovanovic, N., and Zyekch, S., "Development of Premixed Low-Temperature Diesel Combustion in a HSDI Diesel Engine", SAE 2008-01-0639, 2008.
[4] Silvis, W. M., "An Algorithm for Calculating the Air/Fuel Ratio from Exhaust Emissions", SAE 970514, 1997.
[5] Chung, J. W., Kang, J. H., Kim, N. H., Kang, W., Kim, B. S., "Effects of the Fuel Injection Ratio on the Emission and Combustion Performances of the partially Premixed Charge Compression Ignition Combustion Engine Applied with the Split Injection Method", International Journal of Automotive Technology Vol. 9, NO. 1, 1-8, 2008.
[6] Ricardo. Co., "Engine Test Manual-Mass Emissions", 2000.
[7] Christensen, M., Johansson, B., "Supercharged Homogeneous Charge Compression Ignition (HCCI) with Exhaust Gas Recirculation and Pilot Fuel", SAE 2000-01-1835, 2000.
[8] Jeong, D. B., Bang, J. H., Min, K. D., "A Study on the Optimization of Operating Variables in a Diesel Engine by Design Of Experiments", Spring Conference of KSAE Vol. 1, 2008.
[9] Kim, H. M., Kim, K. B., Lee, K. H., Ikeda, Y., "A Study on the Optimization of Operating Conditions for Simultaneous Reduction in NOx and PM in a 4-cylinder Premixed Diesel Engine", SAE 2009-01-0926, 2009.
[10] Murata, Y., Kusaka, J., Odaka, M., Daisho, Y., Kawano, D., Suzuki, H., Ishii, Y. Goto, "Achievement of Medium Engine Speed and Load Premixed Diesel Combustion with Variable Valve Timing", SAE 2006-01-0203, 2006.
[11] Gothekar, S. A., Vora, K. C., Mutha, G. R., Walke, N. H., and Marathe, H. V., "Design of Experiments: A Systems Approach to Engine Optimization for Lower Emissions", SAE 2007-26-012, 2007.
[12] Park, S. W., Bang, S. H., Lee, K. H., Lee, C. S. and Lee, J. H., "Atomization Characteristics of Common-rail Diesel Injector with Multi-Hole", SAE paper 2003-01-1833, 2003.