A new strategy to control the power split in hybrid electric vehicles is presented. The strategy is proposed for a parallel hybrid vehicle where the internal-combustion engine and the electric machine are coupled by a planetary gear system. This low computational burden strategy is designed to operate the internal-combustion engine at the maximum efficiency most of the time, in a similar fashion to serial hybrid electric vehicles, and to keep the state of charge of the battery on a desired level by an easy-to-tune proportional–integral controller. Although the strategy is not formally proven to be optimal, it is inspired by optimal control theory and has the advantage, when compared with optimal strategies, of requiring almost no a priori information about the vehicle or the route.
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