而且也只有很少的车型用其来代替差速锁，而更多的情况是和差速锁同时存在的。差速锁就是锁住两个轮子，不管是电子的还是机械的，功能都是一样的。你可以看看wiki关于差速锁的介绍，另外所有的4x4SUV都是有差速锁的，这里是一段关于2017年F150的介绍：Ford also offers an electronically locking rear differential. This allows the driver to engage the rear locker at low speeds for added traction via a dash-mounted knob. When engaged, the two rear tires spin at the same speed, regardless if one tire has traction. This should only be used when driving in a straight line at low speeds and when traction is an issue.