点火正时:在发动机的压缩冲程终了,活塞达到行程的顶点时,点火系统向火花塞提供高压火花以点燃气缸内的压缩混合气作功,这个时间就是点火正时。为使点火能量最大化,点火正时一般要提前一定的量,所以是在活塞即将到达上止点的那一刻点火,而不是正好达到上止点时才点火,这个提前量叫点火提前角。
文章详细信息 关键词: 天然气发动机;点火正时;稀薄燃烧;排放 [gap=798]Keywords: CNG engine;ignition timing;lean-burn;emissions
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同时由于可调节点火正时,能使发动机的动力性和经济性达到最佳。
Meanwhile, because the ignition timing can be adjusted, the power performance and the economic performance of the engine can obtain the optimum.
早期的控制系统主要是以气缸充气量、燃油质量和点火正时为控制参数。
Earlier engine control systems mainly based on mass air flow, fuel quality and Spark Timing.
点火正时装置:触点必须能够在活塞处于气缸中相关位置时,按时关闭和开启。
Ignition timing devices. The contact points must be timed to close and open in proper relation to the piston positions in the cylinders.
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