Knost, Friedemar ; Demel, Philipp ; Mokros, Alexander ; Beidl, Christian (2024)
Potential analysis of a variable valve train system in the scope of synthetic fuel.
Internationaler Motorenkongress 2023. Baden-Baden (28.02.-01.03.2023)
doi: 10.1007/978-3-658-44982-7_12
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
The subject of these investigations at the Institute for Internal Combustion Engines and Powertrain Systems is the evaluation of a variable valve train system in terms of the potentials with alternative fuels (HVO and OME). In the context of this article, tests are carried out on a single cylinder research engine (SCRE) with a variable valve train, that allows internal EGR in different amounts on the exhaust side as well as a Miller stroke on the air intake. Each exhaust valve can be switched between two camshaft contours, which allows four setups on the exhaust side. On the intake, the camshaft contours of both valves are switched at the same time, which allows Miller and regular setting. Previous investigations have shown, that exhaust temperatures decrease with OME in comparison to Diesel. With the variable valve train, the exhaust gas temperature can be increased and at the same time raw emissions be lowered. The investigation of these effects compared between Diesel, HVO and OME are part of this investigation. Additionally to these investigations, the Miller stroke is under investigation. Less fresh air enters the combustion chamber and the effective compression ratio is reduced. On the other hand, the efficiency of the combustion itself can decrease. Higher efficiency is achieved when the reduced compression work overcompensates the combustion disadvantages or boost pressure is used for compensation. Especially with OME and its higher amount of molecular bounded oxygen the advantage regarding the less sensitive efficiency decrease with high EGR rates is expected to be higher than with Diesel and can show the potential of a synthetic fuel with low NOx-emissions in combination with a variable valve train system.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Knost, Friedemar ; Demel, Philipp ; Mokros, Alexander ; Beidl, Christian |
| Art des Eintrags: | Bibliographie |
| Titel: | Potential analysis of a variable valve train system in the scope of synthetic fuel |
| Sprache: | Englisch |
| Publikationsjahr: | 2024 |
| Ort: | Wiesbaden |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Heintzel, A. (eds) Internationaler Motorenkongress 2023 |
| Buchtitel: | Internationaler Motorenkongress 2023 |
| Veranstaltungstitel: | Internationaler Motorenkongress 2023 |
| Veranstaltungsort: | Baden-Baden |
| Veranstaltungsdatum: | 28.02.-01.03.2023 |
| DOI: | 10.1007/978-3-658-44982-7_12 |
| Kurzbeschreibung (Abstract): | The subject of these investigations at the Institute for Internal Combustion Engines and Powertrain Systems is the evaluation of a variable valve train system in terms of the potentials with alternative fuels (HVO and OME). In the context of this article, tests are carried out on a single cylinder research engine (SCRE) with a variable valve train, that allows internal EGR in different amounts on the exhaust side as well as a Miller stroke on the air intake. Each exhaust valve can be switched between two camshaft contours, which allows four setups on the exhaust side. On the intake, the camshaft contours of both valves are switched at the same time, which allows Miller and regular setting. Previous investigations have shown, that exhaust temperatures decrease with OME in comparison to Diesel. With the variable valve train, the exhaust gas temperature can be increased and at the same time raw emissions be lowered. The investigation of these effects compared between Diesel, HVO and OME are part of this investigation. Additionally to these investigations, the Miller stroke is under investigation. Less fresh air enters the combustion chamber and the effective compression ratio is reduced. On the other hand, the efficiency of the combustion itself can decrease. Higher efficiency is achieved when the reduced compression work overcompensates the combustion disadvantages or boost pressure is used for compensation. Especially with OME and its higher amount of molecular bounded oxygen the advantage regarding the less sensitive efficiency decrease with high EGR rates is expected to be higher than with Diesel and can show the potential of a synthetic fuel with low NOx-emissions in combination with a variable valve train system. |
| Freie Schlagworte: | Variable valve train system, Miller, Internal EGR, Hydrogenated, vegetable oil (HVO), Oxymethylene ether (OME), Synthetic fuels, Efficiency, Emission reduction |
| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Institut für Verbrennungskraftmaschinen und Fahrzeugantriebe (VKM) |
| Hinterlegungsdatum: | 05 Jul 2024 12:01 |
| Letzte Änderung: | 05 Jul 2024 12:01 |
| PPN: | 519626168 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum