Modelling and Measurement of Tribological Parameters Between Piston Rings and Liner in Turbocharged Diesel Engine

摘要

This paper presents tribological modelling, experimental work, and validation of tribology parameters of a single-cylinder turbocharged diesel engine run at various loads, speeds, intake boost pressures, and cylinder liner temperatures. Analysis was made on piston rings and liner materials, rings mechanical and thermal loads, contact pressure between rings and liner, and lubricant conditions. The engine tribology parameters were measured and used to validate the engine tribology models. These tribology parameters are: oil film thickness, coefficient of friction between rings and liner, friction force, friction power, friction torque, shear rate, shear stress and wear of the sliding surfaces. In order to measure the oil film thickness between rings and liner, a single-cylinder AVL turbocharged diesel engine was instrumented to accept the difference in voltage drop method between rings, oil film, and liner. The oil film thickness was measured between top piston ring, second piston ring and oil ring along the engine stroke from the bottom reversal to top reversal.