Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

Study on Fuel Consumption Improvement in SI Engine with EGR for Hybrid Electric Vehicle

하이브리드용 가솔린엔진의 EGR을 통한 연비향상에 관한 연구

  • Published : 2008.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

EGR(exhaust gas recirculation) is considered as a most effective method to reduce the NOx emissions. But high EGR tolerance is always pursued not only for its advantages of the pumping loss reduction and fuel economy benefit in Gasoline-Hybrid engine. However, the occurrence of excessive cyclic variation with high EGR normally prevents substantial fuel economy improvements from being achieved in practice. Therefore, the optimum EGR rate should be carefully determined in order to achieve low fuel consumption and low exhaust emission. In this study, 2 liters gasoline engine with E-EGR system was used to investigate the effects of EGR on fuel efficiency, combustion stability, engine performance and exhaust emissions. With optimal EGR rates, the fuel consumption was improved by 4%. This improvement was achieved while a reduction in NOx emissions of 75% was accomplished. Increase of EGR gas temperature causes the charge air temperature to affect the knock phenomenon and moreover, the EGR valve lift changes for the same control signal.

Keywords

References

  1. G. R. Neame, D. P. Gardiner, R. W. Mallory, V. K. Rao, M. F. Bardon and V. Battista, "Improving the Fuel Economy of Stoichiometrically Fuelled S.I. Engines by Means of EGR and Enhanced Ignition a Comparison of Gasoline, Methanol and Natural Gas," SAE 952376, 1995
  2. S. Diana, V. Giglio, B. Iorio and G. Police, "A Strategy to Improve the Efficiency of Stoichiometric Spark-ignition Engines," SAE 961953, 1996
  3. C. S. Kim, J. H. Choi and B. K. Oh, "A Study for EGR Distribution of Gasoline Engine Using CFD," Fall Conference Proceedings, KSAE, pp.106-111, 2006
  4. J. H. Son, H. Y. Kim, J. T. Chung, W. T. Kim and W. G. Lee, "The Flow and Mixing Characteristics of the Fresh Air and EGR Gas for Mixer Configurations at Downstream of Throttle Valve," Fall Conference Proceedings, KSAE, pp.134-140, 2004
  5. J. Przastek, A. Dabkowski and A. Teodorczyk, "The Study of Exhaust Gas Recirculation on Efficiency and NOx Emission in Spark-ignition Engine," SAE 1999-01-3514, 1999
  6. M. Tabata, T. Yamamoto and T. Fukube, "Improving NOx and Fuel Economy for Mixture Injected SI Engine with EGR," SAE 950684, 1995
  7. S. S. Moon, J. J. Choi, E. Abo-Serie and C. S. Bae, "The Effects of Split-Injection and EGR on the Combustion Characteristics of a DISI Engine," Transactions of KSAE, Vol.14, No.1, pp.144-152, 2006
  8. J. Y. Cha, J. H. Kwon, Y. J. Cho and S. S. Park, "The Effect of Exhaust Gas Recirculation (EGR) on Combustion Stability, Engine Performance and Exhaust Emissions in a Gasoline Engine," KSME International Journal, Vol.15, No.10, pp.1442-1450, 2001
  9. G. H. Abd-Alla, "Using Exhaust Gas Recirculation in Internal Combustion Engines: A Review," Energy Conversion and Management, pp.1027-1042, 2002
  10. K. T. Yeom, Y. M. Woo, J. Y. Jang, Y. K. Park and C. S. Bae, "Performance and Emission Characteristics of Liquid-Phase LPG Injection Engine with Different EGR Rate," Transactions of KSAE, Vol.11, No.5, pp.7-14, 2003