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Influence of injection rate shaping on combustion and emissions for a medium duty diesel engine

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Abstract

This paper describes the effects of injection rate shaping on the combustion, fuel consumption and emission of NOX and soot of a medium duty diesel engine. The focus is on the influence of four different injection rate shapes; square type 1, square type 2, boot and ramp, with a variation of maximum injection pressure and start of injection (SOI). The experiments were carried out on a 1 liter single cylinder research diesel engine equipped with an amplifier-piston common rail injection system, allowing the adjustment of the injection pressure during the injection event and thus injection rate as desired. Two strategies to maintain the injected fuel mass constant were followed. One where rate shaping is applied at constant injection duration with different peak injection pressure and one strategy where rate shaping is applied at a constant peak injection pressure, but with variable injection duration. Injection rate shaping was found to have a large effect on the premixed and diffusion combustion, a significant influence on NOx emissions and depending on the followed strategy, moderate or no influence on soot emission. Only small effects on indicated fuel consumption were found.

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Abbreviations

B:

A boot type of injection

CAD:

Crank Angle Degrees after top dead center

HRL:

Heat Release Law [J]

INOx :

Emission Index of Nitrous Oxides [gno /kgfuel]

IP:

Injection pressure [bar]

ISOOT:

Emission Index of soot [gsoot/kgfuel]

Logic SOI:

The start of injection programmed in engine control unit [CAD]

R:

A ramp type of injection

Real SOI:

The real start of injection [CAD]

RoHR:

Rate of Heat Release [J/CAD]

S1:

A normal square type of injection

S2:

A modified square type of injection

SOC:

Start of Combustion [CAD]

TDC:

Top Dead Center

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Authors and Affiliations

  1. Universidad Politécnica de Valencia. CMT-Motores Térmicos, Camino de Vera, s/n 46022, Valencia, Spain

    J. Benajes, S. Molina & K. De Rudder

  2. Chalmers University of Technology, Hörsalsvägen 7, 41296, Gothenburg, Sweden

    T. Rente

Authors
  1. J. Benajes
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  2. S. Molina
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  3. K. De Rudder
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  4. T. Rente
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Correspondence to S. Molina.

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Benajes, J., Molina, S., De Rudder, K. et al. Influence of injection rate shaping on combustion and emissions for a medium duty diesel engine. J Mech Sci Technol 20, 1436–1448 (2006). https://doi.org/10.1007/BF02915967

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  • DOI: https://doi.org/10.1007/BF02915967

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