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As the community is becoming more and more aware and conscious of the pollution problems caused by the internal combustion engine and its use in transportation, we are now seeing the first projects and prototypes regarding hybrid and electrically-powered vehicles. One of the main problems witnessed by engineers has been that of the relatively low operating range provided by the storage batteries available on the market today, and so, recovering the energy that is inevitably lost during braking is of primary importance. The concept of regenerative braking is fairly simple as it consists in making the electric motors function as generators. In many of today's applications we find two indipendent controls for the operation of the hydraulic brake and for the activation of regenerative braking.