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Figure6givestheperformancesofthemotorandthegeneratorofthecoaxialpower-splithybrid powertrainwith anHESS. The input power of themotor generally follows thevehicle driving powerduring the cycle,whichmeans only a small part of themechanical power of the diesel engine isused topropel thevehicledirectly.Although the currentof themotorvaries inawide range from�193.6 to215.9A, itdoesnot exceed themaximumoperation currentof themotor. Figure 5. Analysis results for the performance of theHESS system: (a) the electric power output by theHESS, (b) the poweroutputs of thebatteriesPbat and the supercapacitorsPsc, (c) SOCsof thebatteriesSOCbat and the supercapacitors SOCsc, (d)outputvoltagesof thebatteriesUbat andthesupercapacitorsUsc, (e)outputcurrentsof thebatteries ibatandthe supercapacitors iscwherepositivevaluesdenotedischargingprocessandnegative for charging. A Hybrid Energy Storage System for a Coaxial Power-Split Hybrid Powertrain http://dx.doi.org/10.5772/67756 95