Fuel cell hybrid city buses are set to play a prominent role in public traffic applications by offering a more energy efficient and less polluting drive-train alternative to conventional internal combustion engine (ICE) vehicles. During the past ten years the Chinese university - industry - collaboration organization developed several fuel cell hybrid city buses. Three of them were demonstrated in the Beijing Olympic Games of 2008, and caused great attention. However, the hybrid powertrain needs to be improved, so as to fulfill the vehicle power requirement, prolong the working life time of the fuel cell stacks, and keep the battery charge sustaining. Similar to the old one, the new generation consists of two fuel cell stacks, a traction battery and an electric motor. The differences reflect in three aspects. Firstly, the two stacks are regulated independent with each other. Secondly, a real-time applicable average power prediction algorithm of the electric motor is exploited. Thirdly, the output power of each stack is determined in accordance with the states, which are estimated on-line. A novel energy management strategy considering average electric motor power prediction, SOC balancing, battery temperature feedback control, fuel cell resistance estimating is exploited. Experimental results show the effectiveness of the proposed system.

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