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LP EGR Influence on Performance of Turbocharged Direct Injection Gasoline Engine

  • Hong Wei
  • Lianbao Li
  • Lin Yang
  • Narendra Purania
  • 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)

Abstract

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.

Keywords

LP EGR Engine Performance BSFC Emissions 

Definitions/Abbreviations

LP

Low pressure

HP

High pressure

EGR

Exhaust gas recirculation

CEGR

Cooled exhaust gas recirculation

CR

Compressor ratio

WLTC

World light test cycle

RDE

Real driving emission

TDI

Turbocharged direct injection

DP

Delta pressure

COV

Coefficient of variation

BMEP

Brake mean effective pressure

CA50

Crank angle where 50% of FMB

BSFC

Break-specific fuel consumption

VVL

Variable valve lift

VVT

Variable valve timing

HCCI

Homogeneous charge compression ignition

ECU

Electronic control unit

TC

Turbo charger

WOT

Wide-open throttle

S415

Smoke intensity

CO

Carbon oxide

NOx

Nitrogen oxide

HC

Hydrocarbon

ZWOUT

Ignition angle

wnwsa

Intake VVT

wnwse

Exhaust VVT

Prist_w

Fuel rail pressure

Mpa

Megapascal

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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
  • 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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