A one-dimensional ring-pack lubrication model developed at MIT is applied to simulate the oil film behavior during the warm-up period of a Kohler spark ignition engine. This is done by making assumptions for the evolution of the oil temperatures during warm-up and that the oil control ring during downstrokes is fully flooded. The ring-pack lubrication model includes features such as three different lubrication regimes, i.e., pure hydrodynamic lubrication, boundary lubrication and pure asperity contact, nonsteady wetting of both inlet and outlet of the piston ring, capability to use all ring face profiles that can be approximated by piece-wise polynomials, and, finally, the ability to model the rheology of multigrade oils. Not surprisingly, the simulations show that by far the most important parameter is the temperature dependence of the oil viscosity.

Issue Section:
Internal Combustion Engines: Cold Start Phenomena
Keywords:
engines, lubrication, interface phenomena, sliding friction, mechanical contact, flow simulation, temperature, rheology, wetting
Topics:
Compression, Engines, Film thickness, Lubrication, Piston rings, Temperature, Viscosity, Spark-ignition engine, Rheology, Cylinders, Oils, Petroleum, Surface roughness, Wetting, Friction, Absorption, Desorption, Stress, Simulation
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