Modeling for Friction of Four Stroke Four Cylinder In-Line Petrol Engine

Abstract

A four stroke four cylinder in-line petrol engine is modeled to estimate various performance parameters. The solution is based on tribology and dynamics principle. The detailed parameters relating to engine friction and lubrication are computed numerically for the engine firing order 1-3-4-2. The numerical method is based on finite difference method that solves coupled Reynolds Equation and Energy Equation. Output includes the movie thickness, friction force, friction power loss and temperature rise in the ring liner conjunction in all four cylinders. Transient regime of ring liner lubrication isaddressed while the same changes from hydrodynamic to mixed in an engine cycle. Momentary cessation near the top and bottom dead center that causes boundary interaction is analyzed through asperity contact. The non - Newtonian behavior of lubricant film due to pressure and temperature is addresses using viscosity -pressure- temperature inter relationship.

Keywords

• Friction
• Piston subsystem
• High performance engine
• Firing order
• Tribodynamics