The invention waste heat conversion system for a motor vehicle includes a waste heat converting vapor engine coupled by a one way clutch to a motor-generator which is coupled through an engageable clutch to the vehicle drive train. The motor-generator of the invention system is also electrically connected to a storage battery and can either charge the battery or be powered by the battery to provide added power to the drive train. The invention system is capable of numerous modes of operation and can also be configured to convert braking energy for storage in the battery.
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