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Optimization of Injection System Parameter for CRDI Small Cylinder Diesel Engine by using Response Surface Method

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Abstract

This paper represents an experimental as well as statistical investigation of a laboratory-scale single-cylinder diesel engine. The study involved retrofitting the mechanical fuel supply system with a simple version of the common rail direct injection (CRDI) system. The CRDI injection system parameters such as injection pressure, pilot injection timing, the start of main injection timing, and the quantity of fuel injection percentage during the pilot and main injection period were considered in the study. The study was performed to optimize system parameters with respect to performance and emission aspects. These aspects mainly include reducing brake-specific fuel consumption (BSFC), emissions such as carbon monoxide (CO), nitrogen oxides (NOx), smoke, and hydrocarbon (HC), and increase brake thermal efficiency. The regression equations were derived considering the interactive effects between injection pressures, the pilot as well as main injection timing and quantity of percentage injection. The surface plots derived from the regression equations were used to analyse the effect of system parameters. Diesel injection at a pressure of 600 bar, main injection at 15° CA bTDC (crank angle before top dead centre), pilot injection at 40° CA bTDC, and fuel injection percentage at 10–90 were found to be optimum for the CRDI single-cylinder diesel engine. The further validation of optimum parameters was done by conducting a confirmatory test on the engine. The maximum prediction error was found to be 3.37%.

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Abbreviations

bTDC:

Before top dead centre

aTDC:

After top dead centre

TDC:

Top dead centre

RSM:

Response surface method

CRDI:

Common rail direct injection

BTE:

Brake thermal efficiency

BSFC:

Brake-specific fuel consumption

SOMI:

Start of main injection

SOPI:

Start of pilot injection

IP:

Injection pressure

HC:

Hydrocarbon

CO:

Carbon monoxide

NOx:

Nitrogen oxides

CA:

Crank angle

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Acknowledgements

The authors admire the assistance of the Department of Mechanical Engineering VJTI for facilitating this research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Veermata Jijabai Technological Institute (VJTI), Mumbai, India

    Dipak Kisan Dond & Nitin Parashram Gulhane

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  1. Dipak Kisan Dond
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  2. Nitin Parashram Gulhane
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Correspondence to Dipak Kisan Dond.

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Dond, D.K., Gulhane, N.P. Optimization of Injection System Parameter for CRDI Small Cylinder Diesel Engine by using Response Surface Method. J. Inst. Eng. India Ser. C 102, 1007–1029 (2021). https://doi.org/10.1007/s40032-021-00688-6

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