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Fuel Economy Improvement Analysis of Hybrid Electric Vehicle

  • InChun Chung
  • Hyehyun Kang
  • Jinil ParkEmail author
  • Jonghwa Lee
Article
  • 74 Downloads

Abstract

Owing to stricter environmental regulations and greenhouse gas reduction targets, hybrid electric vehicles (HEVs) have marked a remarkable increase in market share to replace internal combustion engine vehicles (ICEVs). Among HEVs, powersplit HEVs have attracted increasingly higher interest, and lead the trend of the HEV market. Although many studies have attempted to improve the fuel efficiency of powersplit HEVs, only a few studies have focused on the effect of vehicle system on fuel efficiency. Thus, this study compared the performance of a powersplit HEV and an ICEV by measuring and analyzing the improvement of fuel efficiency for each influencing factor. The energy flow in the main system components of a powersplit HEV, such as engine, motor, drivetrain, and wheel, was modeled, and four driving modes of ICEV and powersplit HEV were tested by using a chassis dynamometer. Finally, the improvement in fuel efficiency of a powersplit HEV was determined for each component and was quantified to allow comparative evaluation against that of an ICEV.

Key Words

Hybrid Electric Vehicle (HEV) Fuel economy Energy flow Vehicle energy management 

Nomenclature

mf

fuel mass

Wf

fuel work, J

Weng

engine output work, J

Wind

engine indicated work, J

Wpump

engine pumping work, J

Wegf

engine friction work, J

Walt

alternator work, J

Wth,loss

thermodynamic loss work, J

Whevbat

HEV battery work, J

Wmgl

motor — generator work, J

Wel parts loss

electric parts loss work, J

Wwheel input

wheel input work, J

Wrl

road load work, J

Wvi

vehicle inertia work, J

Wbrk

braking loss work, J

QLHV

fuel lower heating value, kJ/kg

Vauxbat

auxiliary voltage, V

Vhevbat

HEV voltage, A

Iauxbat

auxiliary current, V

Ihevbat

HEV current, A

Neng

engine speed, rpm

Neng

engine speed, rpm

Nwheel

wheel speed, rpm

Nveh

vehicle speed, km/h

Twheel

motor — generator torque, Nm

Twheel

wheel torque, Nm

tfuel

fuel injection time, sec

τfule

temperature of fuel, degC

Pfuel

fuel pressure, kPa

Pcyl

cylinder pressure, kPa

Vcyl

cylinder volume, m

ηalt

efficiency of alternator

ηM

efficiency of motor

ηG

efficiency of generator

ηth

thermal efficiency of engine

aveh

vehicle acceleration, m/s2

idle fuel loss

fuel loss of idle

COCEC

contribution of the components energy consumption

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References

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Copyright information

© KSAE 2019

Authors and Affiliations

  • InChun Chung
    • 1
  • Hyehyun Kang
    • 1
  • Jinil Park
    • 1
    Email author
  • Jonghwa Lee
    • 1
  1. 1.Department of Mechanical EngineeringAjou UniversityGyeonggiKorea

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