摘要：For a series plug-in hybrid electric vehicle,higher working efficiency can be achieved by the drive system with two small motors in parallel than that with one big motor ***,the overly complex structure will inevitably lead to a substantial increase in the development *** improve the system price-performance ratio,a new kind of series-parallel hybrid system evolved from the series plug-in hybrid system is *** to the technical parameters of the selected components,the system model is established,and the vehicle dynamic property and pure electric drive economy are *** on the dynamic programming,the energy management strategy for the drive system under the city driving cycle is developed,and the superiority validation of the system is *** the studied vehicle driven by the designed series-parallel plug-in hybrid system,compared with the one driven by the described series plug-in hybrid system,the dynamic property is significantly improved because of the multi-power coupling,and the fuel consumption is reduced by 11.4%with 10 city driving *** a word,with the flexible configuration of the designed hybrid system and the optimized control strategy of the energy management,the vehicle performance can be obviously improved.