Analysis of Piston Friction in Internal Combustion Engine

-Effects of Cylinder Bore Temperature Distribution and Oil Temperature-

Abstract

Hybrid vehicles (HVs) are becoming more widely used. Since HVs supplement engines drive with motor power, the lubricant oil temperature remains at a lower level than in a conventional gasoline vehicle. This study analyzed the effect of cylinder liner temperature and lubricant oil temperature on engine friction. The results showed that, although the lubricant oil temperature was hardly significant, the liner temperature had an effect on piston friction. It was found that raising the temperature of the middle section of the cylinder liner was the most effective way of reducing piston friction.