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Reibungspotentiale im Tribosystem Kolben/Zylinderlaufbahn Reibungsabschätzung, -messung und -simulation mit AVL FriPrO, AVL FRISC und AVL EXCITE
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Piston to liner friction is responsible for a significant part (up to 50%) of total engine friction losses. Engine manufacturers use liner offset designs to address this issue and potentially reduce friction losses as is to be expected from theoretical considerations. A “floating liner” single cylinder engine was used to directly measure the effect of such liner offset design on the friction losses. Results show benefits to be gained at moderate speeds where cylinder pressure effects are the main drivers of piston to liner contact forces. At high engine speed this trend reverses due to piston inertia effects.
This study presents calculations on the global fuel energy consumption used to overcome friction in passenger cars in terms of friction in the engine, transmission, tires, and brakes. Friction in tribocontacts was estimated according to prevailing contact mechanisms such as elastohydrodynamic, hydrodynamic, mixed, and boundary lubrication. Coefficients of friction in the tribocontacts were estimated based on available information in the literature on the average passenger car in use today, a car with today’s advanced commercial tribological technology, a car with today’s best advanced technology based upon recent research and development, and a car with the best technology forecasted in the next 10 years. The following conclusions were reached:
Österreich Patent No. AT514794 (A1)
- K Salzgeber
- M E Hammer
Salzgeber, K., Hammer, M. E.: Österreich Patent No. AT514794 (A1). (2015).
Simulation und Analyse der Kolbengruppenreibung im Verbrennungsmotor mit der Floating Liner Methode. Dissertation am
- J Edtmayer
Edtmayer, J.: Messung, Simulation und Analyse der Kolbengruppenreibung im Verbrennungsmotor mit der Floating Liner Methode. Dissertation am Institut für Maschinenelemente und Entwicklungsmethodik der Technischen Universität Graz. (2019).
Potential of the sustainable C1-fuels OME, DMC, and MeFo for particulate free combustion in DI and SI engines
- M Härtl
- D Pélerin
- P Dworschak
- T Maier
- A Stadler
- S Blochum
- K Gaukel
- E Jacob
- G Wachtmeister
Härtl, M., Pélerin, D., Dworschak, P., Maier, T., Stadler, A., Blochum, S., Gaukel, K., Jacob,
E., Wachtmeister, G.: Potential of the sustainable C1-fuels OME, DMC, and MeFo for particulate free combustion in DI and SI engines. In: 5th International Engine Congress, Baden-Baden (2018)