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Experimental characterization of cooled EGR in a gasoline direct injection engine for reducing fuel consumption and nitrogen oxide emission

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Abstract

The emphasis on increasing fuel economy and reducing emissions is increasing. Attention has turned to how the performance of a gasoline direct injection (GDI) engine can be improved to achieve lower fuel consumption and NOx emission. Therefore, positive effects can reduce fuel consumption and NOx emission as well as knock suppression. The cooled exhaust gas recirculation (EGR) ranges within the characteristic map are characterized from the experimental results at various speeds and brake mean effective pressures in a GDI engine. The results show that the application of cooled EGR system brought in 3.63 % reduction as for the fuel consumption and 4.34 % as for NOx emission.

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Abbreviations

dQ:

Rate of heat relese (W)

dV:

Rate of cylinder volume (mm3)

dθ:

Rate of crank angle (°)

dp:

Rate of cylinder pressure (bar)

r:

Ratio of specific heats; cp/cv (−)

COVimep :

COV of the imep (%)

σimep :

Standard deviation of IMEP (bar)

imep:

Average of IMEP (bar)

EGR:

Rate exhaust gas recirculation rate (%)

CO2intake:

Concentration of CO2 in intake manifold (ppm)

CO2exhaust:

Concentration of CO2 in exhaust manifold (ppm)

CO2amb:

Concentration of CO2 in ambient intake air (ppm)

\({\text{NO}}_{{{\text{x}}_{\text{t}} }}\) :

Target NOx emission level (ppm)

\({\text{COV}}_{{{\text{imep}}_{\text{t}} }}\) :

Target combustion stability level (%)

FCt :

Target fuel consumption level (g/min)

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Acknowledgments

This work was supported by the 2014 Post-doctoral Research Program of Inje University.

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Authors and Affiliations

  1. Department of Mechanical Engineering and High Safety Vehicle Core Technology Research Center, INJE University, 607 Eobang-Dong, Gimhae-si, Gyongsangnam-do, 621-749, Republic of Korea

    Sang-Ki Park, Jungkoo Lee, Kyungcheol Kim, Seongho Park & Hyung-Man Kim

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  1. Sang-Ki Park
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  2. Jungkoo Lee
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  3. Kyungcheol Kim
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  4. Seongho Park
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  5. Hyung-Man Kim
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Correspondence to Hyung-Man Kim.

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Park, SK., Lee, J., Kim, K. et al. Experimental characterization of cooled EGR in a gasoline direct injection engine for reducing fuel consumption and nitrogen oxide emission. Heat Mass Transfer 51, 1639–1651 (2015). https://doi.org/10.1007/s00231-015-1633-0

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  • DOI: https://doi.org/10.1007/s00231-015-1633-0

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