Reverse IIR filter as a tool for cylinder indicating channel patency impact correction on measured cylinder pressure waveform

• Autorzy: Łutowicz M.
• Języki publikacji: EN

Abstrakty

EN

Indicating of large marine and industrial diesel engines is made with using indicating channels in cylinder head with valves. The impact of these channels on the value of the parameters obtained from indicating is significant. However, indicating is commonly used for comparative tests assuming that this error is the same on all cylinders of the same engine in identical conditions. As a result of operation especially in cylinders with irregular combustion process the coke occurs in the channel limits its patency. It causes changes in the image of indicated pressure. In such a situation defined parameters are subject of considerable random error. In the earlier studies on the engine Sulzer type 6AL20/24 cylinder channel failure was simulated and channel chocking symptom was observed as apparent TDC shift relative to a reference mark connected with the shaft. As part of ongoing studies attempt to reconstruct distorted pressure curve by chocked indicating channel was made. It is assumed that the channel with the valve is only connection between throttling element in the form of a channel with the much greater volume of the valve. Such a structure was modeled as IIR filter. For this type of filter, there is an unequivocal inverse transformation, which, at least in theory gives possibility to reconstruct the distorted pressure waveform. The reconstruction was carried out by selection of the filter coefficients so as to eliminate the shift of TDC. In practice it turned out that the reconstruction is not perfect. All obtained pressure waveforms are slightly noisy and distorted in the first phase of expansion. Despite this, there was a significant reduction in errors of some parameters determined from the reconstructed pressure waveform.

Słowa kluczowe

EN

marine diesel engine; indicated; diagnostics; indicated channel

• 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. 2
• Strony: 253--259
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Łutowicz M.

• Naval Academy in Gdynia, Department Mechanical-Electrical Engineering Śmidowicza Street 69, 81-103 Gdynia, Poland tel.: [phone]

Bibliografia

• [1] Lus, T., Tuning method for high-speed Marine diesel engine MB820 type, Journal of KONES Powertrain and Transport, Vol. 17, No. 2, Warszawa 2010.
• [2] Wimmer, A., Glaser, J., Indykowanie silnika. Engine indication, AVL List GmbH Przedstawicielstwo w Polsce, Warszawa 2004.
• [3] Kluj, S., Diagnostyka urządzeń okrętowych. Diagnosis of marine equipment, Gdynia: Studium Doskonalenia Kadr S.C. Wyższej Szkoły Morskiej w Gdyni, 1992.
• [4] Cuper, D. Łutowicz, M., Influence of indicator valve channel untightens and loss of patency on the parameters values image obtained from indicator diagram, Journal of KONES Powertrain and Transport, Vol. 18, No. 4, Warszawa 2011.
• [5] Łutowicz, M., Evaluation of the Condition of Cylinder Systems of the Engine Based Ion an Compression Process Analysis, Polish Journal of Environmental Studies, Vol. 18, No. 2A, Olsztyn 2009.
• [6] Polanowski, S., The processing of indicator diagrams with the use of the moving approximating objects, Combustion Engines, No. 1, 2005.