International Journal of Vehicle Structures and Systems

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Injection Timing Variation and its Influence on the Performance and Combustion Characteristics on a Direct Injection CI Engine


Affiliations
1 Dept. of Mech. Engg, Hindustan University, Chennai, India
2 Dept. of Automobile Engg., Hindustan University, Chennai, India
 

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The present experimental investigation aims at improving the combustion and performance parameters by varying the injection timing. A 3.5 kW single cylinder stationary CI engine equipped with eddy current dynamometer is used in this investigation. The static injection timing is varied using spill method by an advancement and retirement of 2 CAD with respect to standard injection timing of 23 °BTDC. On comparison with the standard injection timing, the brake thermal efficiency, cylinder pressure, rate of heat release, mean gas temperature and rate of pressure rise are found to increase along with a significant decrease in brake specific fuel consumption for an advanced injection timing of 21 °BTDC. Negative improvement is observed with respect to retarded injection timing of 25 °BTDC. Optimum parameters for enhanced engine performance is found to be 21°BTDC injection timing with a 200 bar injection pressure at rated speed.

Keywords

Injection Timing Variation, In-Cylinder Pressure, Net Heat Release, Mean Gas Temperature.
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  • Injection Timing Variation and its Influence on the Performance and Combustion Characteristics on a Direct Injection CI Engine

Abstract Views: 233  |  PDF Views: 132

Authors

V. Hariram
Dept. of Mech. Engg, Hindustan University, Chennai, India
S. Seralathan
Dept. of Mech. Engg, Hindustan University, Chennai, India
M. Rajasekaran
Dept. of Automobile Engg., Hindustan University, Chennai, India
G. John
Dept. of Automobile Engg., Hindustan University, Chennai, India

Abstract


The present experimental investigation aims at improving the combustion and performance parameters by varying the injection timing. A 3.5 kW single cylinder stationary CI engine equipped with eddy current dynamometer is used in this investigation. The static injection timing is varied using spill method by an advancement and retirement of 2 CAD with respect to standard injection timing of 23 °BTDC. On comparison with the standard injection timing, the brake thermal efficiency, cylinder pressure, rate of heat release, mean gas temperature and rate of pressure rise are found to increase along with a significant decrease in brake specific fuel consumption for an advanced injection timing of 21 °BTDC. Negative improvement is observed with respect to retarded injection timing of 25 °BTDC. Optimum parameters for enhanced engine performance is found to be 21°BTDC injection timing with a 200 bar injection pressure at rated speed.

Keywords


Injection Timing Variation, In-Cylinder Pressure, Net Heat Release, Mean Gas Temperature.



DOI: https://doi.org/10.4273/ijvss.10.1.12