LP EGR Influence on Performance of Turbocharged Direct Injection Gasoline Engine

  • Hong Wei
  • Lianbao Li
  • Lin Yang
  • Narendra PuraniaEmail author
  • Xuehai Qin
  • Huacheng Zhou
  • Dongya Chen
  • Xiaoli Tian
  • Yunlong Kuang
  • Ruiping Wang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 486)


Low-pressure exhaust gas recirculation (EGR) is one of the several technologies that are being investigated to deliver future reduction of CO2 and to match legislative emission standards. This paper now presents the influence of low-pressure EGR that is applied to a TDGI engine and the effects of EGR on fuel consumption and emission is studied. By dyno steady-state testing and vehicle simulation, a fuel consumption reduction of 6.18% is achieved under WLTC. The result will interest many professionals working in this field. Stringent legislative measures/national and international legislation/laws are forcing the automotive industry to reduce the fuel consumption and emission. To comply with those regulations and to stay competitive on the global market, it is necessary to adopt new technology. Cooled exhaust gas recirculation (CEGR) is an effective way to improve fuel economy and to reduce NOx. LP EGR technology was applied to a 1.5-L three-cylinder TDI engine during this study which is specified below. Design of experiment methods was used to adopt the best combination of CR11, valve timing, modifying piston geometry, and the camshaft. To reduce combustion duration, the ignition coil was upgraded from 75  to 90 MJ. Performed vehicle steady state simulation to realize fuel consumption reduction at WLTC cycle. Engine dyno test under steady state operating condition with CR11, able to achieve fuel consumption reduction of 6.18% at WLTC cycle compared to the base engine. At low-speed and high-load (1920 rpm@18 bar) test, result shows maximum fuel consumption reduction of 16.5%, as EGR lowers the knocking tendency, which enables to advance the ignition timing. Increasing EGR rate reduces NOx, but increases HC.


LP EGR Engine Performance BSFC Emissions 



Low pressure


High pressure


Exhaust gas recirculation


Cooled exhaust gas recirculation


Compressor ratio


World light test cycle


Real driving emission


Turbocharged direct injection


Delta pressure


Coefficient of variation


Brake mean effective pressure


Crank angle where 50% of FMB


Break-specific fuel consumption


Variable valve lift


Variable valve timing


Homogeneous charge compression ignition


Electronic control unit


Turbo charger


Wide-open throttle


Smoke intensity


Carbon oxide


Nitrogen oxide




Ignition angle


Intake VVT


Exhaust VVT


Fuel rail pressure




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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Hong Wei
    • 2
  • Lianbao Li
    • 2
  • Lin Yang
    • 2
  • Narendra Purania
    • 2
    Email author
  • Xuehai Qin
    • 2
  • Huacheng Zhou
    • 2
  • Dongya Chen
    • 2
  • Xiaoli Tian
    • 2
  • Yunlong Kuang
    • 2
  • Ruiping Wang
    • 1
    • 2
  1. 1.Zhejiang Geely Royal Engine Co., Ltd.NingboChina
  2. 2.Ningbo Geely Royal Engine Components Co., Ltd.NingboChina

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