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By using a light bus prototype, this article discusses system design with vehicle dynamic demand, driving environment, cost and etc., proposes a self-adapt control method to adjust start and stop time of the range extender based on the vehicle's average output power demand and battery SOC status. The range extender works in the most efficient point (area) with constant power consumption after system cranks. Finally, field tests are done according to an actual bus routine and CCBC situation. These results verify the rationality of system architecture and corresponding control method which effectively improve the overall fuel economy.

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