Effects of Oil Element Component on Pre-Ignition and Super-Knock at Low Speed

WU Tianbao; FAN Yadong; LI Xuesong; XU Min

doi:10.3969/j.issn.1001-2222.2019.02.004

Vehicle Engine ›› 2019, Vol. 0 ›› Issue (2) : 22-27. DOI: 10.3969/j.issn.1001-2222.2019.02.004

Effects of Oil Element Component on Pre-Ignition and Super-Knock at Low Speed

WU Tianbao，FAN Yadong，LI Xuesong，XU Min

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Abstract

With the gradual strengthening of engine, the knocking tendency of engine increased under low speed and high load conditions and the low speed preignition phenomenon instead of normal ignition was a necessary and insufficient condition for superknock. Through the bench test of a supercharged direct injection engine, the relationships between the advance degree of preignition timing and the peaktopeak value of cylinder pressure oscillation and maximum cylinder pressure were acquired and the relationship between the preignition timing and its development result was described. Then the influence of oil additive with different element components on the preignition frequency was discussed, the role of magnesium element in the oil additive was mainly described and the effects of calcium element on frequency, probability and strength of preignition evolving into superknock was further analyzed.