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master's thesis
Varijabilni pogon ventila za automobilski Otto motor
Rijeka: University of Rijeka, Faculty of Engineering, 2019. urn:nbn:hr:190:890359
Gubo, Marko
University of Rijeka
Faculty of Engineering
Department of Thermodynamics and Energy Engineering
Section of Marine Engineering

Institutional repository: Repository of the University of Rijeka, Faculty of Engineering

Cite this document

Gubo, M. (2019). Varijabilni pogon ventila za automobilski Otto motor (Master's thesis). Rijeka: University of Rijeka, Faculty of Engineering. Retrieved from https://urn.nsk.hr/urn:nbn:hr:190:890359

Gubo, Marko. "Varijabilni pogon ventila za automobilski Otto motor." Master's thesis, University of Rijeka, Faculty of Engineering, 2019. https://urn.nsk.hr/urn:nbn:hr:190:890359

Gubo, Marko. "Varijabilni pogon ventila za automobilski Otto motor." Master's thesis, University of Rijeka, Faculty of Engineering, 2019. https://urn.nsk.hr/urn:nbn:hr:190:890359

Gubo, M. (2019). 'Varijabilni pogon ventila za automobilski Otto motor', Master's thesis, University of Rijeka, Faculty of Engineering, accessed 18 January 2025, https://urn.nsk.hr/urn:nbn:hr:190:890359

Gubo M. Varijabilni pogon ventila za automobilski Otto motor [Master's thesis]. Rijeka: University of Rijeka, Faculty of Engineering; 2019 [cited 2025 January 18] Available at: https://urn.nsk.hr/urn:nbn:hr:190:890359

M. Gubo, "Varijabilni pogon ventila za automobilski Otto motor", Master's thesis, University of Rijeka, Faculty of Engineering, Rijeka, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:190:890359

Metadata
TitleVarijabilni pogon ventila za automobilski Otto motor
Title (english)Variable valve train for automotive petrol engine
AuthorMarko Gubo
MentorTomislav Mrakovčić (mentor)
Committee memberKristian Lenić (predsjednik povjerenstva)
Committee memberRoberto Žigulić (član povjerenstva)
Committee memberOzren Bukovac (član povjerenstva)
GranterUniversity of Rijeka
Faculty of Engineering
(Department of Thermodynamics and Energy Engineering)
(Section of Marine Engineering)
Rijeka
Defense date and country2019-07-16, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Razvodni sustav motora je zadužen za otpremanje ispušnih plinova i izgorenih čestica te za osiguravanje potrebne količine svježeg zraka čime se omogućuje ponavljanje procesa. Razvodni sustav motora čine: usisni filtri, cilindri, bregasta vratila, ventili, mehanizmi prenošenja sile, ispušni vodovi i prigušivači. Okretanjem bregastog vratila, brjegovi preko podizača ili putem klackalica, poluga i opruga otvaraju i zatvaraju ventile. Budući da je prijenosni omjer koljenastobregasto vratilo 1 : 2, za dva okretaja koljenastog, bregasto napravi jedan. S gledišta kutnog kretanja, može se reći da se nakon dva okretaja koljenastog i jednog okretaja bregastog vratila, ona "poklope" u nuli. Varijabilnim pogonom ventila se utječe se na promjenu faznog kuta bregastog vratila u odnosu na koljenasto. Jedan od primjera tehnoloških rješenja varijabilnog pogona ventila je BMW-ov VANOS. Jednostruki VANOS upravlja samo bregastim vratilom usisnih ventila, dok Double VANOS upravlja s oba bregasta vratila, odnosno omogućava upravljanje vremenom otvaranja i zatvaranja i usisnih i ispušnih ventila. Bregastim vratilima se u tom slučaju konkretno upravlja preko mehaničko-hidrauličkog sklopa kojim upravlja računalni sustav vozila. U računalu su pohranjeni podaci optimalnih kutova otvaranja i zatvaranja ventila za što bolje performanse. Optimalne vrijednosti kutova se dobivaju pomoću simulacijskih softvera poput Lotusa, kao u slučaju ovog diplomskog rada. Prednosti varijabilnog pogona ventila se očituju u smanjenoj potrošnji goriva te povećavanju snage i momenta.
Abstract (english)
The gases exchange system is responsible for ejection of exhaust gases and particles and thereby ensuring the required amount of fresh air for another combustion process. This system is built of: suction filters, cylinders, camshafts, valves, force transmission mechanisms, exhaust pipes and springs. By rotating the camshaft, cams are opening and closing valves through lifters and rocker arms. The transmission ratio of the camshaft and crankshaft is 1:2. Variable valve train is introduced in order to avoid shafts overlap in the zero degrees and lead to improve engine operation. The single VANOS manages only the intake valves camshaft, while the Double VANOS manages both camshafts, enabling timing control of inlet and exhaust valves. In this case, the camshafts are specifically controlled via a mechanical-hydraulic unit controlled by the vehicle's computer system. The computer stores data of optimum angles of opening and closing valves for a better performance. Optimal angular values are gained through simulation software like Lotus as in this master thesis. The benefits of variable valve train are reflected in reduced fuel consumption and increased power and torque.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:190:890359
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2019-08-26 10:55:14