Late intake valve closing as a way of the throttleless control of SI engine load

• 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. The realization of the charge exchange process is connected with the necessity of overcoming the flow resistances, then with the necessity of doing a work, so-called the charge exchange work. The flow resistance caused by throttling valve is especially high at the partial load running of an engine. A system with independent, late intake valve closing has been analysed. The use of the analysed system to governing of an engine load will enable to eliminate a throttling valve from 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 Atkinson-Miller cycle has been assumed as a model of processes proceeding in the engine with variable intake valve actuation. The system has been analysed individually and comparatively with open Seiliger-Sabathe cycle, which is theoretical cycle for the classic throttle governing of engine load. Benefits resulting from application of the system with late intake valve closing have been assessed on the basis of the selected parameters: a fuel dose, a cycle work, relative charge exchange work and cycle efficiency.

Słowa kluczowe

EN

spark-ignition engine; variable valve actuation; late intake valve closing; open Atkinson-Miller cycle; charge exchange process; cycle efficiency

• 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: 2012
• Tom: Vol. 19, No. 1
• Strony: 491--499
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Żmudka Z.

autor

Postrzednik S.

autor

Przybyła G.

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

Bibliografia

• [1] Cope, D., Wright, A., Corcoran, C., Pasch, K., Fully flexible electromagnetic valve actuator: design, modeling, and measurements, SAE Technical Paper, No. 2008-01-1350, 2008.
• [2] Franca, O. M., Impact of the Miller cycle in the efficiency of an FVVT engine during part load operation, SAE Tech. Paper, No 2009-36-0081.
• [3] Haas, M., Rauch M., Electro-hydraulic fully variable valve train system, ATZ autotechnology, 02, Vol. 10, 2010.
• [4] Postrzednik, S., Termodynamika zjawisk przepływowych, Wydawnictwo Politechniki Śląskiej, Gliwice 2006.
• [5] Postrzednik, S., Żmudka, Z., Termodynamiczne oraz ekologiczne uwarunkowania eksploatacji tłokowych silników spalinowych, Wydawnictwo Politechniki Śląskiej, Gliwice 2007.
• [6] Postrzednik, S., Żmudka, Z., Badania aplikacyjne nad procedurami niezależnego sterowania zaworami silnika spalinowego, Projekt badawczy nr N502 026 32/2190. PBU 30/RIE-6/07, 05.2007 – 06.2009, Sprawozdanie, Gliwice 2009.
• [7] Szargut, J., Termodynamika techniczna, Wydawnictwo Politechniki Śląskiej, Gliwice 2000.
• [8] Żmudka, Z., Postrzednik, S., Flow resistance in the engine inlet-exhaust system as affected by the engine parameters, Combustion Engines, No. 1 (136), 2009.
• [9] Żmudka, Z., Energetyczne i ekologiczne aspekty doskonalenia procesu wymiany ładunku w silniku spalinowym, Wydawnictwo Politechniki Śląskiej, Gliwice 2010.