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Here is my $.02, and I am in a hurry to get back to work so if it doesn't make sense I will edit/add to it later.
Electric motor A drives the car. Electric motor B (run by the gas engine) charges the batteries. Under extreme circumstances and only for a brief amount of time, rather than charge the batteries motor B's electrical current goes straight to motor A. This provides greater efficiencies, and more power, but also allows the Volt to remain "all electric".
Again just my rough understanding of their drive systems, I could be wrong
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