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An innovative mild hybrid transmission concept is presented and the opportunities described that arise from the addition of an e-machine to the transmission system and the introduction of a freewheel mechanism. Design studies and simulation have shown that hybridising elements of the transmission system can extend the efficiency gains of 12V engine-based mild hybrid systems, specifically in small passenger cars. In addition, combined with the freewheel mechanism, this concept adds desirable features and functionality that justify its cost. The paper will demonstrate how some of this functionality will enable hybridisation of a far broader range of vehicles, helping manufacturers to significantly reduce their fleet CO2 emissions.