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In automotive engineering the electronic differential is a form of differential, which provides the required torque for each driving wheel and allows different wheel speeds. It is used in place of the mechanical differential in multi-drive systems. When cornering, the inner and outer wheels rotate at different speeds, because the inner wheels describe a smaller turning radius. The electronic differential uses the steering wheel command signal and the motor speed signals to control the power to each wheel so that all wheels are supplied with the torque they need. ==Functional description== The classical automobile drive train is composed by a single motor providing torque to one or more driving wheels. The most common solution is to use a mechanical device to distribute torque to the wheels. This mechanical differential allows different wheel speeds when cornering. With the emergence of electric vehicles new drive train configurations are possible. Multi-drive systems become easy to implement due to the large power density of electric motors. These systems, usually with one motor per driving wheel, need an additional top level controller which performs the same task as a mechanical differential. The ED scheme has several advantages over a mechanical differential: * simplicity - it avoids additional mechanical parts such as a gearbox or clutch; * independent torque for each wheel allows additional capabilities (e.g., traction control, stability control); * reconfigurable - it is reprogrammable in order to include new features or tuned according to the driver’s preferences; * allows distributed regenerative braking; * the torque is not limited by the wheel with least traction, as it is with a mechanical differential. * faster response times; * accurate knowledge of traction torque per wheel. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Electronic differential」の詳細全文を読む スポンサード リンク
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