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4.连续循环中的不稳定性 众所周知,每次燃烧情况的不稳定使各循环之间、各缸之间所产生的压力不同。然而,若点火时刻为循环中的最佳点,则它的燃烧率接近于平均值;提前点火使燃烧循环加快,而滞后点火使燃烧循环减慢。而任何偏离循环的正常水平则意味着效率上的损失、功率上的损失,汽车驱动性降低。同时由于非均衡循环而导致非最佳点火时刻,引起废气失控。同样,最快燃烧速度的循环确定辛烷值极限值,因此其压缩比必须低于在循环中能连续反复进行燃烧的压缩比。
4. Instability in Continuous Circulation It is well known that the instability of each combustion condition causes different pressures between cycles and between cylinders. However, if the ignition timing is the best point in the cycle, its combustion rate is close to the average; early ignition accelerates the combustion cycle, and hysteresis fires slows the combustion cycle. And any deviation from the normal cycle means the loss of efficiency, power loss, reduced vehicle drive. At the same time due to non-equilibrium cycle lead to non-optimal ignition timing, causing exhaust out of control. Also, the cycle of the fastest burning rate determines the octane limit, so the compression ratio must be lower than the compression ratio that can be burnt continuously and repeatedly in the cycle.