Performance Evaluation on the Addition of Low-pressure Loop EGR in a Commercial Diesel Engine

상용 디젤엔진의 저압 순환 EGR 추가에 대한 성능 평가

  • Received : 2010.05.24
  • Accepted : 2010.09.29
  • Published : 2011.03.01

Abstract

Through this study, the performance evaluation on the addition of low-pressure loop EGR(Exhaust Gas Recirculation) in a 6.0 L commercial diesel engine was carried out using WAVE modeling and simulation. Since the key technology of advanced diesel engine combustion such as low-temperature combustion is to steadily supply high rates of EGR in a wide operating range, the current study could be effectively contribute to the design and development processes of up-to-date diesel engine systems as real-world reference data. The current simulation results show that the system in which low-pressure loop EGR is added shows almost 2.3 times increase in maximum EGR rate at 1000 rpm as well as almost 1.6 times increase at 2200 and 1600 rpm in comparison with an engine system employing high-pressure loop EGR only. Also, both turbocharger axis speed and charging pressure level did not deteriorate due to the addition of low-pressure loop EGR at 2200 and 1000 rpm, but they were fairly decreased at 1600 rpm.

Keywords

References

  1. http://www.dieselnet.com/standards/
  2. Y. He, D. Brown, S. Lu, M. Paratore and J. Li, "Opportunities and Challenges for Blended 2-Way SCR/DPF Aftertreatment Technologies," SAE 2009-01-0274, 2009.
  3. M. Schaefer, L. Hofmann, P. Girot and R. Rohe, "Investigation of NOx- and PM-reduction by a Combination of SCR-catalyst and Diesel Particulate Filter for Heavy-duty Diesel Engine," SAE 2009-01-0912, 2009.
  4. N. Singh, C. Rutland, D. Foster, K. Narayanaswamy and Y. He, "Investigation into Different DPF Regeneration Strategies Based on Fuel Economy Using Integrated System Simulation," SAE 2009-01-1275, 2009.
  5. R. Cloudt, F. Willems and P. van der Heijden, "Cost and Fuel Efficient SCR-only Solution for Post-2010 HD Emission Standards," SAE 2009-01-0915, 2009.
  6. D. Hou, H. Zhang, Y. Kalish, C. Lee and W. L. Cheng, "Adaptive PCCI Using Micro-Variable Circular-Orifice (MVCO) Fuel Injector - Key Enabling Technologies for High Efficiency Clean Diesel Engines," SAE 2009-01-1528, 2009.
  7. X. He, R. Durrett and Z. Sun, "Late Intake Valve Closing as an Emissions Control Strategy at Tier 2 Bin 5 Engine-Out NOx Level," SAE 2008-01-0637, 2008.
  8. Y. Huang and J. Leet, "Investigation of In- Cylinder NOx and PM Reduction with Delphi E3 Flexible Unit Injectors on a Heavy-Duty Diesel Engine," SAE 2008-01-1792, 2008.
  9. M. Sjoberg and J. E. Dec, "An Investigation into Lowest Acceptable Combustion Temperatures for Hydrocarbon Fuels in HCCI Engines," Proc. Combust. Inst., Vol.30, pp.2719-2726, 2005. https://doi.org/10.1016/j.proci.2004.08.132
  10. C. P. Koci, Y. Ra, M. Andrie, R. Krieger, D. Foster, R. M. Siewert and R. Durrett, "Multiple Event Fuel Injection Investigations in a Highly- Dilute Diesel Low Temperature Combustion Regime," SAE 2009-01-0925, 2009.
  11. J. T. Kashdan, P. Anselmi and B. Walter, "Advanced Injection Strategies for Controlling Low-temperature Diesel Combustion & Emissions," SAE 2009-01-1962, 2009.
  12. D. S. Kim, I. Ekoto, W. F. Colban and P. C. Miles, "In-Cylinder CO and UHC Imaging in a Light-duty Diesel Engine during PPCI Low- Temperature Combustion," SAE 2008-01-1602, 2008.
  13. S. H. Cho, K. C. Oh and C. B. Lee, "Characteristics of Low Temperature Combustion in Single Cylinder Engine by High EGR Rate," Transactions of KSAE, Vol.17, No.4, pp.79-85, 2009.
  14. E. J. Shim, S. W. Han, J. Y. Jang, J. S. Park and C. S. Bae, "Expansion of Operating Range and Reduction of Engine Out Emission in Low Temperature Diesel Combustion with Boosting," Transactions of KSAE, Vol.17, No.5, pp.31-38, 2009.
  15. Korea Auto Forum, A White Paper on Automobile and Environment, 2007.
  16. Ricardo, WAVE 8.0 Help System.