In this product type, diesel engine is still the main power, the motor can't separate drive vehicle, just in climbing or acceleration to give aid to drive.
在这品类型中，柴油机依旧是主要动力，马达不可以单独驱动汽车，只是在爬坡或加速时匡助驱动。
2
So gravity compensation is necessary to separate the carrier acceleration and the gravitational acceleration.