Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of EGR Rate and Injection Timing on the Characteristics of Exhaust Emissions in Light-duty Diesel Engine

Cooled EGR 시스템의 EGR률과 연료분사시기가 소형 디젤엔진의 배기 배출물 특성에 미치는 영향에 관한 연구

  • Gong, Ho-Jeong (School of Mechanical Engineering, Graduate School of Korea University) ;
  • Hwang, In-Goo (School of Mechanical Engineering, Graduate School of Korea University) ;
  • Ko, A-Hyun (School of Mechanical Engineering, Graduate School of Korea University) ;
  • Myung, Cha-Lee (School of Mechanical Engineering, Korea University) ;
  • Park, Sim-Soo (School of Mechanical Engineering, Korea University) ;
  • Lim, Chang-Sik (R&D Center, Kamtec Inc)
  • 공호정 (고려대학교 대학원 기계공학부) ;
  • 황인구 (고려대학교 대학원 기계공학부) ;
  • 고아현 (고려대학교 대학원 기계공학부) ;
  • 명차리 (고려대학교 기계공학부) ;
  • 박심수 (고려대학교 기계공학부) ;
  • 임창식 (캄텍 기술연구소)
  • Received : 2010.06.16
  • Accepted : 2011.10.06
  • Published : 2012.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

Cooled EGR system is widely used to reduce NOx emissions in diesel engine. But when EGR rate was increased, combustion stability was worsened and PM level was increased. So determining optimized control point of EGR rate is important. In order to determine this point, it is important to figure out the effect of EGR system on the exhaust emissions. In this research, NOx and PM emissions were analyzed with various coolant temperature supplied to the EGR cooler at several positions such as downstream of turbocharger, upstream and downstream of DPF. Effects of some variables such as EGR rate, hot / cooled EGR and change of injection timing were estimated. And $CO_2$ emissions were measured at exhaust and intake manifold to calculate EGR rate at each engine operating condition. Also combustion analysis was performed in each engine operating conditions. In the result of this study, there was trade-off between NOx emissions and PM emissions. When EGR rate was increased, combustion pressure was decreased and COV of IMEP was increased.

Keywords

References

  1. J. B. Heywood, Internal Combustion Engine Fundamentals, Mc-Graw Hill, New York, 1988.
  2. B. D. Hsu, Practical Diesel-engine Combustion Analysis, SAE, 2002.
  3. F. Yang and O. Minggao, "Experimental Research on EGR in a Diesel Engine Equipped with Common Rail Injection System," SAE 2003- 01-0351, 2003.
  4. J. Zhu and K. Lee, "Effect of Exhaust Gas Recirculation on Particulate Morphology for a Light-duty Diesel Engine," SAE 2005-01-0195, 2005.
  5. Y. Han, Y. Oh and S. Oh, "An Experimental Study on Performance and Exhaust Gas in a Heavy-duty Diesel Engine with Cooled-EGR," Transactions of KSAE, Vol.9, No.5, pp.1-8, 2001.
  6. N. H. Choi, G. S. Kim, B. J. Jang and G. A. Kim, Defining the Mechanism of Pulmonary Diseases Induced by Air-borne Particulate Matters and Development of Treatment Methods, KOSEF Report, 2005.
  7. H. Gong, I. G. Hwang, S. Park, Y. Jang and C. Lim, "Experimental Investigation on Exhaust Characteristics of NOx and PM according to Coolant Temperature Variation of EGR System," Spring Conference Proceedings, KSAE, KSAE 10B-0078, 2010.
  8. A. Ko, H. Lee, K. Hong, K. Min and S. Park, "Particulate Matter Behaviors in the Aftertreatment System of Diesel Engine Using Fast PM Analyzer," Spring Conference Proceedings, KSAE, pp.19-24, 2009.
  9. H. Choi and K. Min, "The Down-sizing for the Better Fuel Efficiency of HSDI Diesel Engines," Auto Journal, KSAE, Vol.30, No.6, pp.28-33, 2008.
  10. C. Bae, "The Effect of EGR on the Combustion in a High Speed Direct-injection Diesel Engine," Proceedings of UK-Korea Joint Seminar on Internal Combustion Engines, KSAE, pp.173- 194, 1998.
  11. Y. S. Cho, S. W. Lee, J. S. Lee, Y. B. Yoon and Y. J. Park, "An Experimental Study on Regeneration Characteristics by Variation of Exhaust Gas Temperature, HC and $O_{2}$ Concentrations on DOC-CDPF System," Transactions of KSAE, Vol.17, No.1, pp.43-49, 2009.

Cited by

  1. Experimental Evaluation of EGR and Fuel Injection Pressure on Combustion, Size-resolved Nano-particle and NOx Emissions Characteristics in an Advanced Light-duty Diesel Engine vol.22, pp.7, 2014, https://doi.org/10.7467/KSAE.2014.22.7.008
  2. Study on Optimization of Fuel Injection Parameters and EGR Rate of Off-road Diesel Engine by Taguchi Method vol.22, pp.7, 2014, https://doi.org/10.7467/KSAE.2014.22.7.084
  3. An usefulness study on estimation and control method of EGR ratio using intake manifold pressure in an gasoline engine vol.38, pp.7, 2014, https://doi.org/10.5916/jkosme.2014.38.7.806
  4. Numerical Analysis of Engine Efficiency by Pilot and Main Injection Timing Optimization through 1D Modeling of Diesel Engine vol.25, pp.6, 2017, https://doi.org/10.7467/KSAE.2017.25.6.668