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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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Two of the clutches are used to either lock the ring gear of the planetary gear-set or connect it to the generator/motor depending on the mode. The third clutch connects the internal combustion engine to the generator/motor to provide range extension capability. In this mode, the ring gear is held (locked) by clutch C1.

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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 major components of the propulsion system are the battery pack, the drive unit, and the engine. Clutches are OWC1, C1 and B1. Each motor-generator is connected with a sun gear, and a clutching device can provide reaction torque by holding the ring gear of that planetary gear set. The range-extending engine is a 1.5-liter

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