Abstract
Low temperature combustion was developed using a four-cylinder light vehicle diesel engine. Operating conditions considered were 1600 rpm, 1bar and 3bar IMEP. Both EGR and split injection strategy were optimized in order to obtain the lowest BSFC accompanied with a low level of emissions. It was found that a late injection strategy with high levels of EGR rate was required for simultaneous reduction of NOx and soot. However, the fuel consumption remains higher than the conventional combustion regime. Thus, the optimization study of injection parameters to improve the trade-off between NOx and soot emissions while maintaining good fuel efficiency was performed. Several injection pressures were tested. The results showed that as injection pressure increased, NOx emissions increased slightly, soot initially decreased sharply, but further increase of injection pressure on soot was not obvious at low temperature atmosphere, and might lead to increased BSFC. Next, split injection strategy was adopted, optimized pilot injection conditions for minimizing fuel consumption were found at late pilot injection timing with big injection quantity, but little amount of pilot injection could make better comprehensive performance of diesel engine. Through multi-parameter collaborative optimization, the emission reduction path was proposed at operating condition of partial load. Low NOx and soot emissions could be obtained with slightly increase of fuel consumption.
Similar content being viewed by others
References
Akihama, K., Takatori, Y., Inagaki, K., Sasaki, S. and Dean, A. M. (2001). Mechanism of the smokeless rich diesel combustion by reducing temperature. SAE Paper No. 2001-01-0655.
Alriksson, M. and Denbratt, I. (2006). Low temperature combustion in a heavy duty diesel engine using high levels of EGR. SAE Paper No. 2006-01-0075.
Azimov, U., Kim, K., Jeong, D. and Lee, Y. (2009). Evaluation of low-temperature diesel combustion regimes with n-Heptane fuel in a constant-volume chamber. Int. J. Automotive Technology 10, 3, 265–276.
Brijesh, P. and Sreedhara, S. (2013). Exhaust emissions and its control methods in compression ignition engines: A review. Int. J. Automotive Technology 14, 2, 195–206.
de Ojeda, W., Zoldak, P., Espinosa, R. and Kumar, R. (2008). Development of a fuel injection strategy for diesel LTC. SAE Paper No. 2008-01-0057.
Dickey, D. W., Ryan III, T. W. (1998). NOx control in heavy-duty diesel engines- What is the limit?. SAE Paper No. 980174.
Fang, T., Coverdill, R., Lee, C. and White, R. (2006). Combustion and soot visualization of low temperature combustion within an HSDI diesel engine using split injection strategy. SAE Paper No. 2006-01-0078.
Fang, T., Coverdill, R., Lee, C. and White, R. (2008). Low temperature premixed combustion within a small bore high speed direct injection (HSDI) optically accessible diesel engine using a retarded single injection. Int. J. Automotive Technology 9, 5, 551–561.
Henein, N., Kastury, A., Natti, K. and Bryzik, W. (2008). Advanced low temperature combustion (ALTC): Diesel engine performance, fuel economy and emissions. SAE Paper No. 2008-01-0652.
Idicheria, C. and Pickett, L. (2005). Soot formation in diesel combustion under high-EGR conditions. SAE Paper No. 2005-01-3834.
Jung, S., Ishida, M., Yamamoto, S., Ueki, H. and Sakaguchi, D. (2010). Enhancement of NOx-PM tradeoff in a diesel engine adopting bio-ethanol and EGR. Int. J. Automotive Technology 11, 5, 611–616.
Kimura, S., Aoki, O., Kitahara, Y. and Aiyoshizawa, E. (2001). Ultra-clean combustion technology combining a low-temperature and premixed combustion concept for meeting future emission standards. SAE Paper No. 2001-01-0200.
Kook, S., Bae, C., Miles, P. C., Choi, D. and Pickett, M. (2005). The influence of charge dilution and injection timing on low-temperature diesel combustion and emissions. SAE Paper No. 2005-01-3837.
Maiboom, A., Tauzia, X. and Hetet, J. F. (2008). Experimental study of various effects of EGR on combustion and emission of an automotive direct injection diesel engine. Energy 33, 1, 22–34.
Marc and Lejeune (2004). Potential of primixed combustion with flash late injection on a heavy-duty diesel engine. SAE Paper No. 2004-01-1906.
Nguyen, L., Sung, N., Lee, S. and Kim, H. (2011). Effects of split injection, oxygen enriched air and heavy EGR on soot emissions in a diesel engine. Int. J. Automotive Technology 12, 3, 339–350.
Potter, M. and Durrett, R. (2006). Design for compression ignition high-efficiency clean combustion engines. 2006 Directions in Engine-Efficiency and Emissions Research (DEER) Conf. Detroit, Michigan, USA.
Shimazaki, N., Tsurushima, T. and Nishimura, T. (2003). Dual mode combustion concept with premixed diesel combustion by direct injection near top dead center. SAE Paper No. 2003-01-0742.
Zheng, M., Han, X. and Reader, G. T. (2010). Empirical studies of EGR enabled diesel low temperature combustion. Automotive Safety and Energy 1, 3, 219–228.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yin, B., Wang, J., Yang, K. et al. Optimization of EGR and split injection strategy for light vehicle diesel low temperature combustion. Int.J Automot. Technol. 15, 1043–1051 (2014). https://doi.org/10.1007/s12239-014-0108-5
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12239-014-0108-5