The effect of diesel knock on a turbocharged diesel engine emissions and top compression ring friction

Turbocharged engines with direct injection offer a significant contribution to engine downsizing technology. However, there remain many unsolved and ambitious issues concerning knocking pre-ignition. Therefore, detailed understanding of the top compression ring lubrication fuel economy is critical. This paper focuses on tribological performance under partially lubricated conditions caused by diesel knock in turbocharged engine. A mixed-hydrodynamics model was built including multi-phase flow asperity interactions realistic boundary conditions. The study shows that frictional power losses ring-liner contact increased owing starved gasoline finding indicates control combined inlet can help mitigate emissions conjunction.