Charge exchange control in a SI engine by early exhaust valve closing

• Autorzy: Żmudka Z. , Postrzednik S. , Przybyła G.
• Języki publikacji: EN

Abstrakty

EN

The paper tackles the problems connected with the charge exchange in internal combustion engines. The theoretical analysis of the charge exchange process in the SI engine has been presented. A system with independent, early exhaust valve closing has been analysed. The analysed system enables realization of an internal EGR and elimination of a throttling valve from an inlet system and reduce the charge exchange work, especially within the range of partial load. The decrease of the charge exchange work leads to an increase of the internal and effective works, which results in an increase of the effective efficiency of the spark ignition engine. The open, theoretical cycle has been assumed as a model of processes proceeding in an engine. The system has been analysed individually and comparatively with open Seiliger-Sabathe cycle. Benefits resulting from application of the system with early exhaust valve closing have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, a relative charge exchange work and a cycle efficiency. The best results within decrease of fuel consumption and increase of cycle efficiency are obtained for low engine load. The main parameters characterizing the process of the internal exhaust gas recirculation were also determined. These are the ratio and the multiplicity of the exhaust gas recirculation.

Słowa kluczowe

EN

spark-ignition engine; variable valve actuation; early exhaust valve closing; open theoretical cycle; charge exchange process; exhaust gas recirculation (EGR)

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2013
• Tom: Vol. 20, No. 1
• Strony: 387--394
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Żmudka Z.

• Silesian University of Technology Institute of Thermal Technology Konarskiego Street 18, 44-100 Gliwice, Poland tel.: [phone], fax: [phone]

autor

Postrzednik S.

• Silesian University of Technology Institute of Thermal Technology Konarskiego Street 18, 44-100 Gliwice, Poland tel.: [phone], fax: [phone]

autor

Przybyła G.

• Silesian University of Technology Institute of Thermal Technology Konarskiego Street 18, 44-100 Gliwice, Poland tel.: [phone], fax: [phone]

Bibliografia

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