过程和马达将储存在电池里的电能转换成扭力（带动车轮转动和拖曳前进的力）一样，不过是反向运作，用汽车行驶中减速时所产生的扭力来制造电力，储存在电池里。

• Just as a motor can transform electrical energy stored in a battery into torque (the force that produces wheel rotation and hauling power), the process can run in reverse so that the torque created by slowing a moving car generates electricity that can be accumulated in a battery.