The present study investigates various measures to reduce pressure rise rates (PRRs) in a residual-affected homogeneous charge compression ignition (HCCI) engine. At the same time, the impact of those measures on efficiency and emissions is assessed. Experimental research was performed on a single cylinder engine equipped with a fully flexible valve train mechanism and direct gasoline injection. The HCCI combustion mode with exhaust gas trapping was realized using negative valve overlap (NVO) and fuel reforming, achieved via the injection of a portion of fuel during exhaust recompression. Three measures are investigated for the PRR control under the same reference operating conditions, namely: (i) variable intake and exhaust valve timing, (ii) boost pressure adjustment, and (iii) split fuel injection to control the amount of fuel injected for reforming. Variable exhaust valve timing enabled control of the amount of trapped residuals, and thus of the compression temperature. The reduction in the amount of trapped residuals, at elevated engine load, delays auto-ignition, which results in a simultaneous reduction of pressure rise rates and nitrogen oxides emissions. The effects of intake valve timing are much more complex because they include the variability in the amount of intake air, the thermodynamic compression ratio, as well as the in-cylinder fluid flow. It was found, however, that both early and late intake valve openings (IVOs) delay auto-ignition and prolong combustion. Additionally, the reduction of the amount of fuel injected during exhaust recompression further delays combustion and reduces combustion rates. Intake pressure reduction has by far the largest effect on peak pressure reduction yet is connected with excessive NOX emissions. The research successfully identifies air-path and injection techniques, which allow for the control of combustion rates and emissions under elevated load regime.
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July 2019
Research-Article
Application of Variable Valve Actuation Strategies and Direct Gasoline Injection Schemes to Reduce Combustion Harshness and Emissions of Boosted HCCI Engine
Jacek Hunicz,
Jacek Hunicz
Faculty of Mechanical Engineering,
Lublin University of Technology,
Nadbystrzycka 36,
Lublin 20-618, Poland
e-mail: j.hunicz@pollub.pl
Lublin University of Technology,
Nadbystrzycka 36,
Lublin 20-618, Poland
e-mail: j.hunicz@pollub.pl
1Corresponding author.
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Maciej Mikulski
Maciej Mikulski
School of Technology and Innovation,
Energy Technology,
University of Vaasa,
Vaasa FI-65200, Finland
e-mail: maciej.mikulski@uwasa.fi
Energy Technology,
University of Vaasa,
Wolffintie 34
,Vaasa FI-65200, Finland
e-mail: maciej.mikulski@uwasa.fi
Search for other works by this author on:
Jacek Hunicz
Faculty of Mechanical Engineering,
Lublin University of Technology,
Nadbystrzycka 36,
Lublin 20-618, Poland
e-mail: j.hunicz@pollub.pl
Lublin University of Technology,
Nadbystrzycka 36,
Lublin 20-618, Poland
e-mail: j.hunicz@pollub.pl
Maciej Mikulski
School of Technology and Innovation,
Energy Technology,
University of Vaasa,
Vaasa FI-65200, Finland
e-mail: maciej.mikulski@uwasa.fi
Energy Technology,
University of Vaasa,
Wolffintie 34
,Vaasa FI-65200, Finland
e-mail: maciej.mikulski@uwasa.fi
1Corresponding author.
Manuscript received March 15, 2019; final manuscript received April 3, 2019; published online April 22, 2019. Editor: Jerzy T. Sawicki.
J. Eng. Gas Turbines Power. Jul 2019, 141(7): 071023 (9 pages)
Published Online: April 22, 2019
Article history
Received:
March 15, 2019
Revised:
April 3, 2019
Citation
Hunicz, J., and Mikulski, M. (April 22, 2019). "Application of Variable Valve Actuation Strategies and Direct Gasoline Injection Schemes to Reduce Combustion Harshness and Emissions of Boosted HCCI Engine." ASME. J. Eng. Gas Turbines Power. July 2019; 141(7): 071023. https://doi.org/10.1115/1.4043418
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