Specific duty cycle requirements of a medium duty commercial vehicle impact the choice of architecture for hybrid powertrain. Traditionally, series hybrid systems were proposed for this class of vehicles due to their simplicity and good emissions in urban environment. Recent advances in hybrid powertrain technology demonstrated by major automotive manufacturers raise the question of feasibility of a parallel hybrid concept for the heavy duty application. The objective of the presented study is to quantify the benefits of both concepts and identify the system that represents the most effective solution to address needs of a fleet operator. Computer simulations of a series and parallel hybrid drive were carried out using the actual component and duty cycle data gathered over several years of development and operation of series hybrid delivery vans. A prototype vehicle based on a walk-in van platform has been developed and is presently undergoing field trials in mail delivery service to evaluate its technical and commercial merits.
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