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the u.s. department of energy (doe) freedom car program sets certain goals and technical targets for the electric traction system (consisting of power electronics and electric machines) of advanced vehicles [1]. these requirements are designed so that hybrid electric vehicles (hev) and electric vehicles (ev) gain enough market penetration to ensure a significant reduction
in united states’ dependence on foreign oil. in order to achieve these targets, significant reductions in volume, weight and cost of the thermal management system have to be achieved. at the same time, the performance and lifetime requirements have to be met.
this paper reviews possible approaches for replacing the current cooling system used in hybrid electric vehicles (hevs).
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