The Interaction of Piston-Ring-Cylinder on Flex Fueled Engines MAHLE Brazil Tech Center

Format:

Conference/Event

Author/Creator:

Ferrarese, Ferrarese, author.

Contributor:

Dezotti, Joao Rafael

Nocera, Eduardo

Uehara, Samantha

Vatavuk, Jan

Yamawaki, Marcio

Conference Name:

SAE Brasil 2010 Congress and Exhibit (2010-10-05 : Sao Paulo, Brazil)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

Modern SI engines focusing on CO2 emission reduction has beenapplying flex fuel technology to enable burning biomass fuels. Theprime route is the use of ethanol fuel on these engines. The actionof designing an engine to run with ethanol and gasoline(Flex-Fueled Engines) affects powercell components in differentways. The mechanical loads are higher to ethanol fuel. Thecombustion pressure can be increased without the risk of knockingfor ethanol while for gasoline the compression rate of the pistonis limited due to knocking occurrence. The spark time also occursearlier which impacts components lubrication once the maximum loadhappens near the top dead center (TDC) where the sliding speed islower and consequently there is lower oil film thickness. Suchcombination of spark time and sliding speed may also affectdynamics which can affect inertia and load composition of enginecomponents. The power density of engines running with ethanol isalso higher, which can impact on temperature, which also influencesthe tribology of engine components. Another subject on ethanol isits high corrosive characteristic, which is presenting flakingmechanisms on components, rings for example, not existent ongasoline engine.In this way, this paper compares the effects of such differentengine characteristics given by ethanol fuel on engine components.These effects are presented in a powercell approach evaluating theinteractions between piston, ring and cylinder. Microwelding and/orabnormal groove wear on being dependent on the gas pressure, topland height and ring material is also discussed. Ring and cylinderwear are also affected by the gas pressure but even more onlubrication effects. It is also evaluated the low friction trendson powercell and its adaptations needed on Flex-Fueled Engines. Andit is discussed the harsher environmental effects given byethanol.In this paper also presents the main recommendations onpowercell to best fit on current and future Flex-Fueled Enginesbased on numerical simulation, bench tests and engine tests

Notes:

Vendor supplied data

Publisher Number:

2010-36-0327

Access Restriction:

Restricted for use by site license