机油元素组分对低速早燃与超级爆震的影响

吴天宝; 范亚东; 李雪松; 许敏

doi:10.3969/j.issn.1001-2222.2019.02.004

车用发动机 ›› 2019, Vol. 0 ›› Issue (2) : 22-27. DOI: 10.3969/j.issn.1001-2222.2019.02.004

栏目

机油元素组分对低速早燃与超级爆震的影响

吴天宝，范亚东，李雪松，许敏

作者信息 +

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

WU Tianbao，FAN Yadong，LI Xuesong，XU Min

Author information +

文章历史 +

摘要

随着发动机的逐步强化，发动机低速大负荷工况下爆震倾向增加，而非正常着火的低速早燃现象是超级爆震的必要不充分条件。通过一台增压直喷发动机的台架试验，得出了早燃发生时刻的提前程度与缸压振荡峰峰值和最大缸压之间的关系，阐述了早燃发生时刻与其发展结果之间的关联；探讨了不同元素组分的机油添加剂对早燃发生频次的影响，重点阐述了机油添加剂中镁元素的作用，同时分析了钙元素对早燃发展为超级爆震发生的次数、概率以及超级爆震强度的影响。

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.