The Response of a Closed Loop Controlled Diesel Engine on Fuel Variation

Liebig, Dorothea; Krane, Winfried; Ziman, Pauline; Garbe, Thomas; Hoenig, Martin

doi:10.4271/2008-01-2471

Cited by 17 publications

(5 citation statements)

References 4 publications

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“…Close control of these factors reduces cyclic and cylinder-to-cylinder variability, achieving improved engine performance and reduced emissions. In-cycle fuel and intake charge control techniques are also being developed to enhance the robustness of engine operation [7][8][9]. However, the more unstable nature of LTC compared to conventional diesel combustion adds further complexity to maintaining tight control over the engine operating mode.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

McTaggart-Cowan

Cong

Garner

et al. 2012

Journal of Engineering for Gas Turbines and Power

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This work elucidated which engine operating parameters have the greatest influence on Low temperature diesel combustion (LTC) and emissions. Key parameters were selected and evaluated at low and intermediate speed and load conditions using fractional factorial and Taguchi orthogonal experimental designs. The variations investigated were: about ± 5% in EGR rate, fuel injection quantity and engine speed respectively; and ± we in intake charge temperature. The half-fractional factorial results showed that the interactions among these parameters were negligible for a specific load/speed point. The Taguchi orthogonal method could be used as an efficient DoE tool for studying the multi-parameter 'small-scale transients' that a diesel engine would be likely to encounter when operating in LTC modes. LTC showed the most significant sensitivity to EGR rate variations, where an increase from 60% to 63% in EGR rate doubted THC and CO emissions and reduced combustion stability. LTC was also sensitive to the fuel injection quantity with an increase in injected mass lowering the overall oxygen-fuel ratio and thereby increasing THC and CO emissions. These two parameters influenced the oxygen concentration in the intake charge; which was identified to be a decisive parameter for the LTC combustion and emissions. Intake charge temperature affected the total charge quantity trapped in the cylinder and showed noticeable influence on CO emissions for the low speed intermediate load condition. Variations in engine speed showed a negligible influence on the LTC combustion processes and emissions.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

McTaggart-Cowan

Cong

Garner

et al. 2012

Journal of Engineering for Gas Turbines and Power

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show abstract

“…The changes in COV imep are recently explained in terms of changes of combustion mid-point (CA50) [25]. This combustion mid-point is used in close loop combustion control [26,27] and appears as a natural answer to exposed cycle by cycle variability.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Diesel combustion using multiple injection strategies for idling after cold start of passenger-car engines

Payri

Broatch

Salavert

et al. 2010

Experimental Thermal and Fluid Science

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“…During the last phase of testing, various compensation strategies were explored to adjust combustion phasing to the baseline setting obtained from the first phase of testing. One method to adjust combustion phasing was to adjust injection timing, a method discussed in Liebig et al 17 In this study, SOI was advanced to advance combustion phasing with low CN fuel. Conversely, SOI was retarded to retard combustion phasing when using the high CN fuel.…”

Section: Single-cylinder Engine Testingmentioning

confidence: 99%

An evaluation of cetane sensitivity in low-temperature combustion and options to compensate for market cetane variation

Kurtz

Kuhel

2014

International Journal of Engine Research

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A single-cylinder engine was used to assess the sensitivity of emissions, noise and fuel consumption to variation in cetane number when operated in low temperature combustion both with and without the application of compensation strategies. Without compensation, changes in cetane caused greater variability in all of the parameters studied when operated in low temperature combustion as compared to conventional diesel combustion. Correcting combustion phasing was explored by adjusting three different parameters: start of injection timing, burnt gas fraction and intake manifold temperature. None of these methods were able to achieve substantially equivalent combustion and emissions across all fuels evaluated. Large variations in hydrocarbon and particulate emissions were observed when start of injection was adjusted to correct combustion phasing. Adjusting the burnt gas fraction caused large differences in nitrogen oxides and noise, particularly with low cetane fuels. Finally, intake manifold temperatures low enough to reach the target combustion phasing with the higher cetane fuel were unachievable, suggesting that this method would not be viable as a production solution. It was concluded that the most effective way to ensure robust combustion and emissions in low temperature combustion is to reduce ignition delay variability by refining the fuel specification, either through tighter control over the cetane number range or by shifting the fuel specification toward higher cetane number, where ignition delay is less sensitive to changes in cetane rating.

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The Response of a Closed Loop Controlled Diesel Engine on Fuel Variation

Cited by 17 publications

References 4 publications

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

Investigation of Diesel combustion using multiple injection strategies for idling after cold start of passenger-car engines

An evaluation of cetane sensitivity in low-temperature combustion and options to compensate for market cetane variation

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