AVL LIST GmbH-Mirko Plettenberg, Julian Schäffer, Josef Edtmayer, Sigfried Loesch, Heinz-Georg Flesch
Graz University of Technology-Hannes Hick, Simon Walch
To be published on
by SAE International in United States
To achieve future fleet CO2 emission targets all kind of powertrains including thus with internal combustion engines need to achieve highest efficiency. Next to others the reduction of friction is one contributor to increase powertrain efficiency. The piston bore interface (PBI) is responsible for up to 50% of total engine friction losses. Optimizations in this area combined with use of low viscosity oil, which can reduce the friction of further engine sub-systems, will have the highest positive impact. To assess the friction of PBI under consideration of cross effects on other relevant parameters for mechanical function (e.g. blow-by & wear) and emissions (e.g. oil consumption) AVL has established a holistic development method based on the AVL FRISC (FRIction Single Cylinder) engine with floating liner measurement concept combined with synchronous online oil consumption and wear measurement supported by advanced simulation models, which were validated with further advanced measurement techniques. This paper will present the development method approach based on selected exemplary results and the possible transfer of results to multi cylinder engine development. Alternative Session: M203…
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Technical University of Munich, Germany-Julian Schäffer, Claus Kirner, Martin Härtl, Georg Wachtmeister
by SAE International in United States
The design of cylinder liners, pistons, and piston rings is subject to different conflicting goals. In addition to a loss-free seal of the combustion chamber, sufficient oil must be present between the friction partners. Both the reduction of piston assembly friction and the minimization of oil consumption are crucial to achieve the strictly defined CO2 and emission standards. To master this challenge and find the best compromise requires a lot of system-specific know-how. The automobile and engine manufacturers focus mainly on friction-reducing measures, which are analyzed with different measuring methods such as the floating-liner method, the strip-down method, or the instantaneous indicated mean effective pressure (IMEP) method. However, the interpretation of the results and the development of realistic simulation models lacks information about the oil film behavior and the film thickness. In order to gain this missing knowledge, instruments for oil film visualization and oil film thickness measurement have to be developed. In the FVV-project “Piston ring oil transport - Glassliner”, the two-dimensional laser-induced fluorescence method (2D-LIF) is used to visualize the lubricating oil film…
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