Study on engine lube oil deterioration based on engine operating conditions of small engines 2018-32-0025
Internal Combustion engines require the quality of engine oil to be within specified limits for consistent performance, fuel efficiency and reduced emissions. OEM’s determine the oil change interval mainly based on the distance covered by the motorcycles. The current method causes the oil to be drained too early or too late depending on the riding pattern of the user. The degradation of engine oil is a function of engine operating conditions and environmental conditions. Hence, it is necessary to determine the amount of engine oil degradation using existing sensors in the engine management system. The measurements are done on a 200cc oil-cooled and 400cc liquid cooled single cylinder engines. The engines are subjected to operating points with different Lube oil temperature, Engine speed and Throttle position to determine the oil degradation. The oil samples are tested according to ASTM standards for changes in Kinematic Viscosity, Total Base Number (TBN), Oxidation, Nitration, Carbon Soot and Water Dilution. The variation in oil deterioration trends over the lifetime of the engine is also studied. The oil deterioration trends are analyzed against varying engine operating parameters, which can be used to determine the appropriate oil change interval, with increased reliability and cost saving expected for the end user.