一般人都认为空挡滑行可以省油,其实这种说法说的是片面的,空挡滑行不一定就省油。开过化油器车的老车手们都知道,空档滑行可以省油。那么现在的电喷车还可能通过空档滑行来节油吗?结论是,滑行可以节油,但尽量不要空档滑行。
所谓的电喷发动机,实际上就是由电脑控制燃油喷射的发动机,啥时喷油,喷多少,完全由电脑控制,而这个控制程序是由设计师们预先设定的,它的喷射是有条件的,当符合条件才会喷射。其中有个停止喷油的时刻,那就是加速踏板被完全抬起并且发动机转速高于某个转速时(在惯性作用下发动机转速并不会立即降到怠速800转/分),电脑会指令停止喷油。这个“某个转速”是多少,每个厂家的发动机在设定时会有所不同,一般在1200转/分以上,就停止喷油。这在专业上成为电喷发动机“减速停油”过程。当你高速行驶时,在挂档的情况下你的右脚从加速踏板上抬起,在惯性下,车速和转速都开始下降。只要不低于预先设定的“某个转速”(如1200转/分),发动机就会停止喷油。在发动机反拖动的情况下,发动机转速下降反而会比较慢,这样还有利于延长停止喷油的过程,从而收到很好的省油效果。如果你空档滑行,发动机便会进入怠速运转,而怠速状态下发动机都会有一定的喷油,绝不会停止喷油,其节油效果反而并一定好。
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