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Modeling of pressure line behavior of a common rail diesel engine due to injection and fuel variation

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Abstract

Common rail diesel engines with electronic fuel injection can accurately meter the fuel injection quantity with more accurate fuel injection control capability. In this work a common rail fuel injection system of a single cylinder diesel engine has been proposed and the important parameters like injection pressure, energizing time and high pressure pipes diameter and length are designed such that to be compatible with the engine basic design in case of pressure waves and injected mass variations. A one-dimensional approach has been used to model the injector using AMESim code in which Adiabatic models have been used to model injector system. Injected mass quantity has been calculated for different working point of fuel injection system that can be utilized as engine electronic control maps as inlet parameters. Results indicated that pressure fluctuation at the injector inlet is increased by decreasing pipe diameter while tube length has no significant effect on pressure waves. It is also shows that using biodiesel as fuel will lead to decrease in injection quantity but there is no significant impact on pressure fluctuations.

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Notes

  1. AMsim is a one dimensional software that is capable to model a system with hydraulically, mechanical and electrical components. As the fuel injection system for common rail engines includes electromechanical and hydraulic parts, this software is suitable for modeling of this system.

Abbreviations

A 0 :

Area of nozzle hole (mm3)

C d :

Discharge coefficient

CN:

Cavitation number

CR:

Common-rail

d :

Spring spire diameter (mm)

D :

Spring diameter (mm)

D 0 :

Diameter at the orifice outlet (mm)

ET:

Energizing time (ms)

EDC:

Electronic desel control

HPCR:

High pressure Common-rail

IQA:

Injection Quantity Adjustment

k :

Stiffness of spring (N/m)

L :

Length

\(\dot{m}_f\) :

Mass flow rate (kg/s)

n a :

Spring number of spires

P b :

Discharge pressure (bar)

P i :

Injection pressure (bar)

P v :

Vapor pressure of fuel (bar)

PWC:

Pressure wave correction

RME:

Rape seed methyl ester

u :

Velocity (m/s)

λ :

Flow number

v f :

Fuel kinematic viscosity (cSt)

ρ f :

Fuel density (kg/m3)

ΔP :

Pressure drop (bar)

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Acknowledgments

The authors would like to thanks Fuel Combustion and Emission center of Sharif University of Technology for financial support and Mr. Varzdar and Mr. Hosseinian for their assistance on experimental setup establishment.

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Authors and Affiliations

  1. Automotive Development Center (ADC), Faculty of Mechanical Engineering, Universiti Teknologi Malaysia (UTM), 81310, Johor Bahru, Malaysia

    Mostafa Mohebbi & Azhar Abdul Aziz

  2. Mechanical Engineering Faculty, Amirkabir University of Technology, No. 424, Hafez Avenue, P.O. Box 15875-4413, Tehran, Iran

    Arman Hamidi

  3. Mechanical Engineering Faculty, Semnan University, Semnan, Iran

    Alireza Hajialimohammadi

  4. Mechanical Engineering Faculty, Sharif University of Technology, No. 424, Azadi Avenue, P.O. Box 11365-11155, Tehran, Iran

    Vahid Hosseini

Authors
  1. Mostafa Mohebbi
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  2. Azhar Abdul Aziz
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  3. Arman Hamidi
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  4. Alireza Hajialimohammadi
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  5. Vahid Hosseini
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Correspondence to Mostafa Mohebbi.

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Technical Editor: Luis Fernando Figueira da Silva.

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Mohebbi, M., Aziz, A.A., Hamidi, A. et al. Modeling of pressure line behavior of a common rail diesel engine due to injection and fuel variation. J Braz. Soc. Mech. Sci. Eng. 39, 661–669 (2017). https://doi.org/10.1007/s40430-016-0573-z

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  • DOI: https://doi.org/10.1007/s40430-016-0573-z

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