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In order to meet the problem of motor torque control for plug in hybrid electric vehicle, direct torque control system is designed with Profibus-DP bus and Ethernet communication by using Siemens S7- 300 series PLC and MM 440. Structure and control scheme of the system is described. Hardware design of the system is given. Software design of the system is also completed. Based on the PC witch equipped with WinCC-Flexiblel, Human Machine Interface configuration of the system is made, which achieved human- machine information exchange. Finally, the torque monitoring interface is given after the system is debugged successfully, which confirmed the feasibility of the design. KEYWORD: Programmable logic controller (PLC); Human machine interface (HMI); MM440 inverter; Pro- fibus-DP bus; Torque control; PHEV

Application of MM40 Invert in Direct Torque Control of PHEV