Dissertations / Theses on the topic 'Dieselmotorer'
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Königsson, Fredrik. "En Förbränningsmodell för Dieselmotorer." Thesis, KTH, Maskinkonstruktion (Inst.), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49675.
A modern diesel engine uses common rail fuel injection with solenoid or piezoelectric valves with multiple injections for each combustion event to achieve the desired shape of the cylinder pressure trace during each engine cycle.The practice of adding the fuel in multiple injections during each combustion event has several advantages. One is limiting engine noise by adding a small amount of fuel early during the cycle, thus reducing the premixed part of the combustion once the bulk of the fuel is injected. This is referred to as pilot injection. Another possibility is the addition of a late injection which raises the exhaust temperature which can improve transient response, regenerate particle filters or make possible the use of SCR when low exhaust temperatures would otherwise render such use impossible.Since multiple injections provide additional degrees of freedom, which were previously unavailable, the initial tuning of new engines becomes increasingly complex. New understanding must be achieved as to how different amounts and timings affect the cylinder pressure trace and hence the overall efficiency of the engine. To aid in the tuning process an analytical model for the cylinder pressure is desired. The model would use the timings and amounts of fuel injected as its inputs and predict the resulting cylinder pressure trace, which then could be used as a plant model for simulations or inversely predict the amount and phase of each injection at calibration or real-time, using pressure sensor feedback. The development of such a model has been the focus of this project.The result is a model that, while providing satisfactory precision on some areas, requires more work to fully capture the complex processes taking place in a firing diesel engine.
Höckerdal, Erik. "Observer design and model augmentation for bias compensation with engine applications /." Linköping : Department of Electrical Engineering, Linköpings universitet, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-15885.
Wewel, Jonathan, and Anton Tranvik. "Kylvattenbehandling : En studie av olika korrosionsskydd för kylvattensystem till marina dieselmotorer." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-88975.
Enoksson, Mats. "Data mining : en jämförelse av några tekniker för klassificering och gruppering av dieselmotorer." Thesis, University of Skövde, School of Humanities and Informatics, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-150.
Rapporten behandlar arbetet att med data mining-metoder finna ett samband i insamlad information. Data mining är ett begrepp för att tillämpa artificiell intelligens på en större datamängd. Syftet är i detta fall att hitta ett sätt att klassificera dieselmotorer.
Den datamängd som används kommer från mätningar vid testkörning av dieselmotorer och garantikostnader som motorerna ger upphov till efter leveransen från fabriken. Målet är att finna ett samband mellan testvärdena och kostnaden i syfte att kunna identifiera kostnadsbenägna motorer redan vid testkörningen.
En klusteranalys görs med två olika tekniker, K-means method och Kohonen-nät, som visar att det föreligger ett svagt men ändå förnimbart samband. En jämförelse mellan teknikernas resultat och användbarhet görs.
Två tekniker används till att bygga klassificeringsverktyg som skall kunna sortera ut motorerna med höga kostnader. Teknikerna som används är Beslutsträd och Artificiella neurala nätverk. Båda dessa tekniker klarar att klassificera motorerna rätt till omkring 70%. Resultaten och användbarheten jämförs även här.
Slutsatsen av arbetet är att det föreligger ett samband. Detta är dock för svagt och otydligt för att kunna användas som klassificeringsunderlag för praktiskt bruk. Jämförelsen visar att Kohonen-nät och Artificiella neurala nätverk är att föredra för den här typen av problem.
Bergkvist, Martin. "Riskanalys av brand i avgassytem som avser dieselmotorer som opererar med låg belastning på fartyg." Thesis, Linnéuniversitetet, Sjöfartshögskolan (SJÖ), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-90338.
With escalating bunker costs and oversized engine installations an increasing number of vessels have started to operate in a mode known as slow steaming. This means that the soot fires in exhaust gas boilers/economizers have increased and in some extreme cases led to hydrogen fires. This thesis focus on how diesel engines use residual fuels and operate with a low engine load. The purpose of this thesis is to investigate whether incomplete combustion caused by a low combustion temperature leads to the accumulation of unburned fuel and cylinder oil in the exhaust gas system and to describe which precautions eliminate the risk of a fire in the exhaust gas boiler or exhaust gas economizer. A literature review has been conducted and data has been collected in the field of diesel engine with priority given to marine steam boilers. The result of the study shows how difficult (problematic) it is to run a diesel engine at a lower power output, since the vessel often is designed for a heavy fuel oil operation when the engine load approximately 80 % output. Conclusions from the study show that even when a faultless engine has not reached operating temperature, incomplete combustion of fuel and lubricating oil occurs due to the low temperature in the combustion chamber. This can entail operational risks by accumulating unburned fuel and cylinder oil in exhaust systems such as wet and sticky carbon deposit. The result shows that water washing, steam cleaning and catalytic cleaning are the most efficient cleaning methods for most deposits in exhaust gas boilers and economizers.
Eriksson, Claes, and Linus Lindström. "Miljövänligare dieselmotorer : En studie om vilka tekniska lösningar dieselmotorutvecklande företag använder för att bemöta existerande och framtida miljökrav." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-58980.
The elementary acknowledgement that the present report is based upon is the fact that the environmental awareness in the world has risen which forces many companies to adapt their production to the current demands. One of the most affected industries is that of vehicles where the engine manufacturers ought to reduce the emission levels of produced engines to a fraction of the previous ones. The purpose of this report is thus to examine what technical solutions these companies utilize to produce more environmentally friendly engines, and investigate which methods that seem interesting for future development. The report also includes an analysis of whether hauliers/buss-companies/individuals which employ these companies’ diesel engines are willing to pay extra for an environmentally friendly engine. The method to convey sufficient material to write this report includes an extensive studie of published literature of existing techniques, interviews with representatives from different companies and experts, and a written enquiry handed out randomly to 62 hauliers and 88 individuals. Interviews were held with Volvo, Scania, Drivetrain Sweden AB, Alfdex(a co-operation between Alfa Laval and Haldex), Haldex Concentric, Clean Oil Technology, and Andreas Cronhjort (senior assistant master in internal combustion engine technique at Royal Institute of Technology in Sweden). The essential and remarkable result which previously described method enhanced was that the current research that companies invest in has mainly focused on maintaining the laws on reduction of nitrogen-oxides and particulate matter but now has shifted focus to reduction of carbon-dioxide emissions. The main reason for why companies predicts that new laws won’t deal with further reduction of NOx and PM emissions buth rather that of CO2 is because the previous are incused with extremely high demands and further reductions wouldn’t be fortunate to the world-economy. Thus, the focus has shifted radically and the companies must adapt their production. Therefore, in the future, they are planning for new methods than those previously used. These new methods that are researched about are declared for in the result- and analysis section of this report. The technical solutions that, in the future, will be useful to reduce the emissions of carbon dioxide are to increase the efficiency in the engine. This can be done through increasing the pressure in the engine, decrease the friction, choose better materials and fuel, absorb the energy in the exhaust-heat, and apply hybridization. Many niche-companies have been created due to the stated purpose (to reduce carbon dioxide emissions) and thus the study comprises interviews with such companies. The analysis in this report demonstrates that the propensity to pay extra for an environmentally friendly engine is fairly small. Furthermore it is noted that hauliers and bus companies seem to be more benevolent to pay for the environment and prioritises it higher than individuals. Probably this is because companies believe they can make money on calling themself environmentally friendly. In addition, the previous trend towards CO2 emissions satisfied customer needs since, according to the enquiry, they prioritize fuel economy high.
Leonardi, Anna. "Feinste Schwebeteilchen aus Dieselmotoren /." [S.l.] : [s.n.], 1991. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9515.
Messing, Roman [Verfasser]. "Virtuelle Abgassensoren für Dieselmotoren / Roman Messing." München : Verlag Dr. Hut, 2014. http://d-nb.info/1049363175/34.
Brander, Kristoffer. "Förbättrad saverringsdesign för dieselmotor." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-25258.
A diesel engine in operation continuously generate small amounts of deposits, which then can form a hard carbon based buildup called coke. The coke is formed in contact with surfaces with high temperature, one of which is the piston top land. When the buildup is thick enough it reaches the inside of the cylinder where it creates friction and thereby polishes the surface. This has a negative effect on the properties of the surface, while it in addition creates an irregular diameter of the cylinder. Oil consumption also increases when oil on the inside of the cylinder is pushed upwards to the combustion chamber by the buildup. To solve this problem Scania introduced an anti-polishing ring. This is located in a seat at the top of the cylinder, at the same height as top dead center on the piston top land. By having a smaller inner diameter than the cylinder, the anti-polishing ring is able to scrape off coke on top land before it reaches the cylinder wall. The aim of this thesis carried out at Scania is to improve the anti-polishing ring design by mainly reducing crevice volumes caused by it. The crevice volumes primarily increase fuel consumption and should therefore be avoided. Alternatives to the anti-polishing ring are also to be documented. The anti-polishing ring was divided into sub features, where every feature was examined to reduce the amount of crevice volume that it causes. Function, crevice volume, robustness and cost was taken into consideration when designing a new anti-polishing ring. Continuous contact with the manufacturer ensured that changes being made were still possible to manufacture. If the existing symmetry of the anti-polishing ring is changed, a means to guarantee that the ring is always assembled correctly needs to be implemented. Several suggestions where compared to find the best solution to the problem. An improved design of the anti-polishing ring is suggested that reduces the crevice volumes by 56,4 % and thereby the fuel consumption by approximately 0,125 %. The conclusion is that the anti-polishing ring is the most effective solution and that the design proposed improves it furthermore.
Wolf, René [Verfasser]. "Vergleich von Dieselmotoren unterschiedlicher Größe / René Wolf." Aachen : Shaker, 2017. http://d-nb.info/1138179094/34.
Larink, Jörg. "Zylinderdruckbasierte Auflade- und Abgasrückführregelung für PKW-Dieselmotoren." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976684039.
Eiglmeier, Christian. "Phänomenologische Modellbildung des gasseitigen Wandwärmeüberganges in Dieselmotoren." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961043253.
Kuhn, Thorsten. "Messung der Zylinderverformung von Aluminiumkurbelgehäusen für Dieselmotoren." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=966269705.
Meyer-Salfeld, Steffen. "Piezogesteuertes Forschungs-Einspritzsystem für direkteinspritzende PKW-Dieselmotoren." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97409000X.
Kopp, Carsten. "Variable Ventilsteuerung für Pkw-Dieselmotoren mit Direkteinspritzung." [S.l.] : [s.n.], 2006. http://diglib.uni-magdeburg.de/Dissertationen/2006/carkopp.htm.
Schmitt, Dietmar. "Präparation, funktionelle und strukturelle Charakterisierung von Oxidationskatalysatoren zur Nachbehandlung von Abgasen dieselmotorbetriebener Fahrzeuge Einfluss von Präparationsverfahren und Edelmetallprekursor beim System Platin/[gamma]-Aluminiumoxid /." [S.l. : s.n.], 1999. http://elib.tu-darmstadt.de/diss/000136.
Block, Bernd. "Untersuchung von Möglichkeiten und Grenzen optischer Messtechniken zur Temperaturbestimmung in Verbrennungsmotoren." [S.l. : s.n.], 1997. http://deposit.ddb.de/cgi-bin/dokserv?idn=954328264.
Funk, Alexander. "Untersuchung des SNR-Verfahrens am Dieselmotor." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96171655X.
Nöthen, Christian [Verfasser]. "Strategien zur Gassystemregelung von Pkw-Dieselmotoren / Christian Nöthen." Aachen : Shaker, 2010. http://d-nb.info/1084535483/34.
Richert, Felix. "Objektorientierte Modellbildung und nichtlineare prädiktive Regelung von Dieselmotoren." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979833264.
Krome, Dirk. "Charakterisierung der Tropfenkollektive von Hochdruckeinspritzsystemen für direkteinspritzende Dieselmotoren." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971919364.
Richert, Felix. "Objektorientierte Modellbildung und nichtlineare prädiktive Regelung von Dieselmotoren /." Düsseldorf : VDI-Verl, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014913167&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Dörner, David [Verfasser]. "Untersuchung zum Kaltleerlauf bei Pkw-Dieselmotoren / David Dörner." München : Verlag Dr. Hut, 2016. http://d-nb.info/1094117196/34.
Müller, Jochen. "Entwicklung eines Niedrig-NOx-Brennverfahrens für Pkw-Dieselmotoren." Aachen Shaker, 2009. http://d-nb.info/994502451/04.
Schollmeyer, Michael [Verfasser]. "Beitrag zur modellbasierten Ladedruckregelung für Pkw-Dieselmotoren / Michael Schollmeyer." Aachen : Shaker, 2010. http://d-nb.info/1081884886/34.
Naumann, Tino. "Wissensbasierte Optimierungsstrategien für elektronische Steuergeräte an Common-Rail-Dieselmotoren." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965199878.
Gerstle, Michael. "Simulation des instationären Betriebsverhaltens hochaufgeladener Vier- und Zweitakt-Dieselmotoren." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=957207913.
Jeschke, Jens. "Konzeption und Erprobung eines zylinderdruckbasierten Motormanagements für PKW-Dieselmotoren." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968650325.
Neugärtner, Jörg [Verfasser], and Rudolf [Akademischer Betreuer] Flierl. "Innere Lastpunktverschiebung bei Dieselmotoren / Jörg Neugärtner ; Betreuer: Rudolf Flierl." Kaiserslautern : Technische Universität Kaiserslautern, 2018. http://d-nb.info/1164012576/34.
Gauthier, Yvan. "Einspritzdruck bei modernen Pkw-Dieselmotoren : Einfluss auf die Russemission /." Wiesbaden : Vieweg + Teubner, 2009. http://d-nb.info/995466890/04.
Dandanell, Erik. "Insprutningens börvärde för en direktinsprutad dieselmotor." Thesis, KTH, Maskinkonstruktion (Inst.), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99319.
The development of diesel engines is driven by tightening emission legislations. The last 15 years up to today's standard Euro V, emission levels have been seriously reduced. The proposals for the 2013 Euro VI standard is to lower the levels for diesel engines critical emissions, nitrogen oxides (NOx) and particulate by 80 respectively 50 percent. To meet these requirements the demands on engines in both hardware and software perspective are high. The purpose of this study is if possible improve the control and extend information of the combustion process. The study is performed as a master thesis on the group of function development at Scania CV AB. The question to be answered is whether the set point of the injection which today is centre of injection should be changed and if so to what. Proposal for a new set point include start of combustion and crank angle 50 percent burned. Neither start of combustion nor crank angle 50 percent burned is known parameters in today's control unit. For this reason a big part of the thesis is to calculate the ignition delay and also the combustion shape. Hardenberg and Hase presented an ignition delay model 1979 [5], this model is the foundation of the new ignition delay formula presented in this work. The new model compensates for parameters affecting the ignition delay in today's modern engines for example EGR, engine water temperature and start of injection. A Wiebe function is used to calculate mass fraction burned fuel and the shape of combustion. The Wiebe function which was originally created for Otto combustion is capable in some cases to estimate the mass fraction burned fuel and the shape of the combustion in a diesel engine. The function works when the combustion is similar to HCCI combustion, in which the ignition delay is long and virtually the entire amount of fuel is premixed with air before start of combustion. Since diesel combustion in most cases involves mixing controlled combustion, it is not possible to estimate the combustion process with a Wiebe function. The study shows that start of combustion can be calculated with good accuracy. However, it has no practical advantages to choose start of combustion as a new set point against the current set point. The recommendation is therefore to maintain the current set point. With that, it is not to say that the model can not be exploited in the control unit, on the other hand there may be cases where it can be very helpful to know the length of ignition delay and thus for example, have an idea of the proportion of the premixed combustion.
Heikel, Christian [Verfasser]. "Werkstoff- und verfahrenstechnische Bewertung von Zylinderköpfen für Dieselmotoren / Christian Heikel." Aachen : Shaker, 2011. http://d-nb.info/1098041151/34.
Bechmann, Olaf. "Untersuchungen zur Ablagerung von Russpartikeln aus dem Abgas von Dieselmotoren." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959587780.
Schwarte, Anselm. "Modellbasierte Fehlererkennung und Diagnose des Ansaug- und Abgassystems von Dieselmotoren /." Düsseldorf : VDI-Verl, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015517428&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Müller, Jochen [Verfasser]. "Entwicklung eines Niedrig-NOx-Brennverfahrens für Pkw-Dieselmotoren / Jochen Müller." Aachen : Shaker, 2009. http://d-nb.info/1156517699/34.
Neef, de A. Tjeerd. "Untersuchung der Voreinspritzung am schnellaufenden, direkteingespritzten Dieselmotor /." Zürich, 1987. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8292.
Merkel, Sascha. "Untersuchung einer neuen Einspritzstrategie zur russarmen Verbrennung bei Dieselmotoren mit Direkteinspritzung." Berlin Logos-Verl, 2008. http://d-nb.info/992155479/04.
Allmendinger, Klaus. "Modellbildung und modellbasierte Estimation thermodynamischer Prozessgrössen am Beispiel eines Dieselmotors." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969582110.
Hopp, Martin. "Untersuchung der Russoxidation unter dieselmotorischen Randbedingungen." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96360662X.
Bikas, Georgios. "Kinetic mechanisms for hydrocarbon ignition." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=964932857.
Remmele, Edgar. "Standardisierung von Rapsöl als Kraftstoff Untersuchungen zu Kenngrössen, Prüfverfahren und Grenzwerten /." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968472435.
May, Ralf Johannes. "Strukturanalyse der Zylinderbohrungsverzüge eines Vollaluminiummotors." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960604995.
Höhne, Gernot. "Untersuchungen zur oxidativen Regeneration von Diesel-Partikelfiltern." [S.l. : s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=976191245.
Correa, Chrys. "Combustion simulations in Diesel engines using reduced reaction mechanisms." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961521937.
Gronki, Joachim. "Quantitative Visualisierung der Gemischbildung, Verbrennung und Schadstoffbildung eines Dieselsprays in einer Hochtemperatur-Hochdruck-Zelle durch multiple mehrdimensionale Laserdiagnostik." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968408869.
Froschhammer, Franz. "Identifikation und Kompensation von Sensorungenauigkeiten für die drehzahlgestützte On-board-Diagnose von Verbrennungsmotoren." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=964921421.
Raatz, Thorsten. "Untersuchungen zur homogenen Dieselverbrennung /." Aachen : Shaker, 2003. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=010574430&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Vanhaelst, Robin. "Optische und thermodynamische Modelle zur Untersuchung der teilhomogenen Dieselverbrennung." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969695071.
Hasse, Ilka. "Einsatz von Photokatalysatoren bei der Reinigung von Kraftfahrzeugabgasen." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=971920087.
Kožuch, Peter. "Ein phänomenologisches Modell zur kombinierten Stickoxid- und Rußberechnung bei direkteinspritzenden Dieselmotoren." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11514002.