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Effect of EGR Combined with Intense Tumble Flow on a Well-Calibrated Commercial Turbocharged GDI Engine

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Abstract

A turbocharged GDI engine with variable intake tumble is used to study the effects of EGR combined with enhanced tumble on the engine’s economy, power, and emissions characteristics. The effects of EGR with enhanced intake tumble flow, on the combustion phase, combustion duration, knock index and combustion cycle variation of the engine, were studied at two speeds of 1500 r/min and 2000 r/min from low to medium and to full load. The research shows that although the commercial engine has been well calibrated and optimized, the optimization of EGR and enhanced tumble flow together with the optimization of the ignition angle can improve the engine’s economy and emission characteristics, while maintaining relatively fast burning speed and low combustion cycle variation. From medium to heavy load, the economy can be improved by 2.6∼10 %, and the minimum fuel consumption can be reduced to 213 g/kW.h (ηe = 36.8 %). At the same time, the increase of the combustion cycle variation is controlled within 5 %, but as the load and the EGR ratio increase, the power loss cannot be compensated by the advance of the ignition angle. The 6 ∼ 21 % EGR ratio brings 3.5 ∼ 9 % power loss.

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Abbreviations

R EGR :

exhaust gas recirculation ratio

P C :

in-cylinder pressure

V C :

in-cylinder volume

Q th-in :

heat transfer through in-cylinder

m c :

mass in-cylinder

u c :

internal energy in-cylinder

ƞ e :

brake thermal efficiency

Cool:

coolant

Exh:

the exhaust gas of the engine

LP:

low pressure

EGR:

exhaust gas recirculation

TGDI:

turbocharged gasoline direct injection

CMCV:

charge motion control valve

TKE:

turbulent kinetic energy

KI:

knock index

CR:

compression ratio

GDI:

gasoline direct injection

HRR:

heat release rate

IMEP:

Indicated mean effective pressure

BMEP:

brake mean effective pressure

BSFC:

brake specific fuel consumption

PMAX:

maximum in-cylinder gas pressure

RMAX:

maximum pressure rise rate

NOx:

Nitrogen oxides

CD:

combustion duration

CA:

crank angle

COV:

Coefficient of Variation

CO2 :

carbon dioxide

HCCI:

homogeneous charge compression ignition

BTDC:

before top dead center

CFD:

computational fluid dynamics

CA50:

CA50 is crank angle at which accumulated heat release reaches 10 % of the total chemical energy.

CA10-90:

CA10-90 is the crank angle that the accumulated heat release turns from 10 % to 90 % of the total chemical energy.

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Acknowledgement

We would like to thank SAIC Science and Technology Foundation project for their support via the Grant No.1731.

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Authors and Affiliations

  1. College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Congbo Yin, Hao Pan, Zhendong Zhang & Kai Shen

  2. Shanghai Volkswagen Automotive Company, 123 Anting Yutian Road, Jiading District, Shanghai, 200093, China

    Haibing Zhu

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  1. Congbo Yin
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  2. Hao Pan
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  3. Zhendong Zhang
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  4. Haibing Zhu
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  5. Kai Shen
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Correspondence to Congbo Yin.

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Yin, C., Pan, H., Zhang, Z. et al. Effect of EGR Combined with Intense Tumble Flow on a Well-Calibrated Commercial Turbocharged GDI Engine. Int.J Automot. Technol. 22, 1347–1361 (2021). https://doi.org/10.1007/s12239-021-0117-0

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