The Effects of Fuels and Lubricants on Low-Speed Pre-Ignition in Gasoline SI Engines

With the onset of downsized and highly-boosted engines,engine designers are encountering a new combustion phenomenon,called low-speed pre-ignition(LSPI) or superknock,which occurs when the engine operates under a low-speed,high-load conditions.LSPI events cause large spikes in cylinder pressure that can easily exceed the design limits of the engine.Therefore,it is important for the automotive industry to understand how LSPI events occur and develop a solution that can either eliminate it or detect and mitigate its effects.This paper summarizes the existing work that has been conducted on the subject of LSPI.Much of the research work presented hypothesizes that physical and chemical interactions and accumulation of fuels and lubricants in the piston top land crevice volume affect the frequency of LPSI events.Therefore,it may be possible to formulate fuels and lubricants that can mitigate or eliminate the occurrence of LPSI.

With the onset of downsized and highly- boosted engines, engine designers are encountering a new combustion phenomenon, called low - speed pre - ignition （LSPI） or superknock, which occurs when the engine operates under a low - speed, high - load conditions. LSPI events cause large spikes in cylinder pressure that can easily exceed the design limits of the engine. Therefore, it is important for the automotive industry to understand how LSPI events occur and develop a so- lution that can either eliminate it or detect and mitigate its effects. This paper summarizes the existing work that has been conducted on the subject of LSPI. Much of presented hypothesizes that physical and chemical interactions and accumulation of fuels and lubricants in crevice volume affect the frequency of LPSl events. Therefore, it may be possible to formulate fuels and mitigate or eliminate the occurrence of LPSI. the research work the piston top land lubricants that can