Besides dispensing with the traditional engine bay on a car, hub motors save space and weight because there is no need for a mechanical transmission, with its driveshafts and differential units.

除了不需在汽车上配置传统发动机舱，由于轮毂电机不需要机械传动(一般有传动轴和差别单位)，轮毂电机能节省汽车空间并减少重量。

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Normally you have an engine or motor going through a differential.

通常你有一个引擎或者电机来带动差速器。

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The switch provides a low-pressure differential signal to the engine control system.

此开关为引擎控制系统提供一个低压差动信号。

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Mathematical models are used to simulate the rest of the car, from the gearbox and rear differential to the force exerted by the road, so that the engine is subjected to the same demands and forces as it would be in a real car.

ECONOMIST: Car design