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Chevy Volt Delivers Novel Two-Motor, Four-Mode Extended Range Electric Drive System; Seamless Driver Experience Plus Efficiency

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In this mode, the ring gear is held (locked) by clutch C1. Virtually all of the vehicle’s motive power is therefore delivered by the traction motor in this mode, including hard accelerations, using power supplied by the battery pack. Click to enlarge. Mode 1: Low-speed EV Propulsion (Engine Off).

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GM provides technical details of the Gen 2 Voltec propulsion system used in the 2016 Volt

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The drive unit contains two newly developed electric motor-generators for propelling the vehicle and other duties; power electronics to supply and control them; a system of gears, clutches, and hydraulic controls to combine and deliver the mechanical power from the motor-generators and the engine; and an electric oil pump.

Volt 150