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Analysis and dynamic calibration of the transient of an SI-engine equipped with turbocharger

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Abstract

Transient is considered an important operation mode of an engine since most of its working cycles happen in this mode. In this paper, GT-Power software is used to model the engine and the turbocharger; moreover, the experimental results from the IPCO Company are used for validation and calibration. The simulation is calibrated for the engine’s steady state in the part- and full-load conditions. Then, since the transient simulation cannot be performed based on the steady-state settings, the engine transient simulation is calibrated. Upon the performed simulation, the calibration differences of the transient and the steady state are investigated. These differences are analyzed during four processes of combustion, injection, heat transfer in the exhaust manifold and the turbocharger performance; then the various parameters’ effect on the engine transient are studied. The considered transient is the one during which the engine load increases with the throttle opening at a constant engine speed. It is concluded that the produced maps of the combustion and injection parameters, which are achieved from the quasi-steady conditions, can properly predict these parameters’ behavior. However, the turbocharger performance and the heat transfer inside the exhaust manifold must be calibrated, transiently. With this procedure for model calibration, the error between the model and the experimental results were decreased significantly. For example, in the speed of 1900 rpm, the error between the model and the experimental data for transient simulation is reduced from 1.57 to 0.18%. The studied engine is 1.65 L EF7-TC which is a spark ignition engine equipped with a turbocharger.

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Abbreviations

aTDC:

After top dead center

BMEP:

Brake mean effective pressure (bar)

CAD:

Crank angle degree

CA50 :

50% Burned fuel point (°)

HTM:

Heat transfer multiplier

IMEP:

Indicated mean effective pressure (bar)

IPCO:

Iran Khodro Powertrain Company

MVEM:

Mean value engine model

PSO:

Particle swarm optimization

QS:

Quasi-steady

SI:

Spark ignition

SS:

Steady state

TEM:

Turbine efficiency multiplier

TC:

Turbocharger

VGT:

Variable geometery turbin

VVT:

Variable valve timing

VNT:

Variable nozzle turbine

WG:

Wastegate

WGD:

Wastegate effective diameter (mm)

WOT:

Wide open throttle

λ:

1/Equivalence ratio

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Authors and Affiliations

  1. Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

    Mehdi Keshavarz, Amir-Hasan Kakaee & Hamidreza Fajri

  2. School of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran

    Amir-Hasan Kakaee & Hamidreza Fajri

  3. Iran Khodro Powertrain Co. (IPCO), P.O. Box 13988-13711, Tehran, Iran

    Amir-Hasan Kakaee & Hamidreza Fajri

Authors
  1. Mehdi Keshavarz
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  2. Amir-Hasan Kakaee
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  3. Hamidreza Fajri
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Correspondence to Mehdi Keshavarz.

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Technical Editor: Fernando Marcelo Pereira.

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Keshavarz, M., Kakaee, AH. & Fajri, H. Analysis and dynamic calibration of the transient of an SI-engine equipped with turbocharger. J Braz. Soc. Mech. Sci. Eng. 40, 358 (2018). https://doi.org/10.1007/s40430-018-1278-2

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  • DOI: https://doi.org/10.1007/s40430-018-1278-2

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