| 王利民，华剑雄，卫海桥，薛亮，左俊杰，李露梅.不同燃烧模式的爆震特性及爆震强度评价方法[J].内燃机工程,2021,42(1):76-84. |
| Evaluation Method of Knock Characteristics and Knock Intensity in Different Combustion Modes |
| DOI：10.13949/j.cnki.nrjgc.2021.01.012 |
| Key Words:combustion mode knocking combustion intensity distribution knock quantification |
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| Abstract:A single-cylinder four-stroke engine equipped with variable valve actuating system was used to study the characteristics of combustion and pressure oscillation in different combustion modes, including homogeneous charge compression ignition（HCCI), gasoline compression ignition（GCI), turbulent jet ignition（TJI) and spark ignition（SI). Results show that different combustion modes have different statistical characteristics. Among them, the knock distribution in HCCI, GCI and TJI modes is relatively concentrated, rarely accompanied by occasional high knock intensity combustion cycles. But in SI mode, the knock distribution is relatively discrete, usually with higher maximum knock intensity and 99% quantile, as well as strong occasional high knock intensity combustion cycles, and also shows a very high maximum knock intensity and a very low 99% quantile under low-speed pre-ignition conditions. Moreover, in terms of the evaluation of knock conditions, based on the improvement of the traditional arithmetic average method and the knock cycle occupancy method, two new knock evaluation methods, the weighted average method and the destructive cyclic average method are proposed, so that the accuracy and adaptability of knock determination in HCCI, GCI, TJI and SI modes are greatly improved than before the improvement. But the use of destructive cyclic average method cannot accurately identify the destructiveness of knocking under low-speed pre-ignition conditions, while the weighted average method still has a very good effect. |
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