A hybrid vehicle is defined as one that has more than one source of power. In a hydraulic hybrid system the engine is coupled with a hydraulic pump/motor assembly and hydraulic accumulator, whereas in electric hybrid systems the engine is coupled with an electric generator/motor and batteries or other electrical storage devices. Both technologies are available in either series or parallel configurations.rnIn a parallel hybrid hydraulic system, the conventional vehicle power train is supplemented by the addition of the hybrid hydraulic system. In a series hybrid hydraulic system, the conventional vehicle drive line is replaced by the hybrid power system. The energy is transferred from the engine to the drive wheels through fluid power. These systems have one thing in common: the recovery and storage of energy normally wasted as heat from friction pads during braking. The objective of a hybrid transmission is to store and re-use as much as possible of this wasted energy.
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