Fuel cells and high energy density batteries have limited overrated capacity and slow power response. Ultracapacitors and flywheels\r\nare proposed to overcome these limitations and to facilitate regenerative braking in hybrid and electric vehicles. The simulations\r\npresented in this paper show that a Secondary Energy StorageUnit (SESU) enhances the performance of the drivelines as previously\r\nsuggested and provides additional improvements. A combined design of the primary energy source and the SESU reduces the total\r\nweight and volume and increases the battery lifetime. A full-electric driveline is simulated using a standard EPA FTP-75 drive\r\ncycle. Then the same vehicle is simulated with as SESU and the results are compared.The same is done for a hybrid driveline. Two\r\ndrivelines are used as references and then enhanced with an SESU; four simulations are presented in total. Simulation results show\r\nthat an energy storage device with very low energy and high power allows better battery selection and energy management.
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