ACT是Active Cylinder Management的简称,意思是主动式气缸管理,也叫断缸控制或变缸控制。对一般的发动机来讲,只要发动机一启动就随即进入到工作状态,那么无论是车辆低速行驶还是怠速运行,发动机的所有气缸便会同时进入工作状态。但在发动机输出功率要求不高时(如低速行驶或停等红灯时),能够让其中几个气缸暂停工作,切断气门开启以及中断喷油器喷油,如一个6缸发动机关闭其中的2个气缸,相当于变为一个4缸发动机 ACT is the acronym for Active Cylinder Management, which means active cylinder management, also known as off-cylinder control or variable-cylinder control. For a typical engine, as soon as the engine starts working, it enters into a working state immediately. All cylinders of the engine will be in the working state at the same time whether the vehicle runs at low speed or idling. However, when the engine output power is not high (such as low speed or stop when the red light), which can be suspended for several cylinders, cut off the valve open and interrupt fuel injector, such as a 6-cylinder engine which shut down 2 A cylinder, equivalent to a 4-cylinder engine