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Fuel Economy Improvement Analysis of Hybrid Electric Vehicle

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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.

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Abbreviations

mf :

fuel mass

W f :

fuel work, J

W eng :

engine output work, J

W ind :

engine indicated work, J

W pump :

engine pumping work, J

W egf :

engine friction work, J

W alt :

alternator work, J

W th,loss :

thermodynamic loss work, J

W hevbat :

HEV battery work, J

W mgl :

motor — generator work, J

W el parts loss :

electric parts loss work, J

W wheel input :

wheel input work, J

W rl :

road load work, J

W vi :

vehicle inertia work, J

W brk :

braking loss work, J

Q LHV :

fuel lower heating value, kJ/kg

V auxbat :

auxiliary voltage, V

V hevbat :

HEV voltage, A

I auxbat :

auxiliary current, V

I hevbat :

HEV current, A

N eng :

engine speed, rpm

N eng :

engine speed, rpm

N wheel :

wheel speed, rpm

N veh :

vehicle speed, km/h

T wheel :

motor — generator torque, Nm

T wheel :

wheel torque, Nm

t fuel :

fuel injection time, sec

τ fule :

temperature of fuel, degC

P fuel :

fuel pressure, kPa

P cyl :

cylinder pressure, kPa

V cyl :

cylinder volume, m

η alt :

efficiency of alternator

η M :

efficiency of motor

η G :

efficiency of generator

η th :

thermal efficiency of engine

a veh :

vehicle acceleration, m/s2

idle fuel loss:

fuel loss of idle

COCEC:

contribution of the components energy consumption

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Authors and Affiliations

  1. Department of Mechanical Engineering, Ajou University, Gyeonggi, 16499, Korea

    InChun Chung, Hyehyun Kang, Jinil Park & Jonghwa Lee

Authors
  1. InChun Chung
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  2. Hyehyun Kang
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  3. Jinil Park
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  4. Jonghwa Lee
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Correspondence to Jinil Park.

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Chung, I., Kang, H., Park, J. et al. Fuel Economy Improvement Analysis of Hybrid Electric Vehicle. Int.J Automot. Technol. 20, 531–537 (2019). https://doi.org/10.1007/s12239-019-0050-7

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  • DOI: https://doi.org/10.1007/s12239-019-0050-7

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