With the gradual strengthening of engine, the knocking tendency of engine increased under low speed and high load conditions and the low speed preignition phenomenon instead of normal ignition was a necessary and insufficient condition for superknock. Through the bench test of a supercharged direct injection engine, the relationships between the advance degree of preignition timing and the peaktopeak value of cylinder pressure oscillation and maximum cylinder pressure were acquired and the relationship between the preignition timing and its development result was described. Then the influence of oil additive with different element components on the preignition 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 preignition evolving into superknock was further analyzed.
WU Tianbao
,
FAN Yadong
,
LI Xuesong
,
XU Min
. Effects of Oil Element Component on Pre-Ignition and Super-Knock at Low Speed
[J]. Vehicle Engine, 2019
, 0(2)
: 22
-27
.
DOI: 10.3969/j.issn.1001-2222.2019.02.004
