A low speed pre-ignition characteristics was studied on a turbocharged direct injection gasoline engine. Results show that under low speed pre-ignition conditions at the speed of 1750 r/min and with a torque of 320 N·m

the earlier the ignition timing of pre ignition

the greater the knocking tendency and its intensity. Moreover

studying the influence of engine operating parameters and lubricating oil physicochemical properties on pre-ignition also shows that the frequency of pre-ignition increases with the rise of inter-cooler temperature and coolant temperature. High viscosity lubricating oil can suppress the frequency and tendency of superknock. Moreover

calcium element in the oil additive greatly promotes the occurrence of superknock

while phosphorus element plays a greater inhibitory role

and magnesium element has the least inhibitory effect.