Development Of The Automotive Electric Power Steering System Based On DSP

The automobile electric power steering system is a new type of Automobile Power Steering system. Providing supplementary force for the automobile via the electromotor, it has more advantages to the hydraulic power steering system, the traditional steering. It can provide an ideal helping force and to save the burning oil, as well as to protect environment. In recent years, many advanced types of automobiles have been equipped with the electric power steering system, it is also one of the hot topics in automobile industry with valuable application market and huge potential prospect.At the beginning of the dissertation, the basic elements and the operating principle of EPS are introduced. We put forward a scheme that a hardware current-loop circuit is designed to regulate the output torque of the motor by utilizing the abundant hardware of DSP basing on the high-performance DSP TMS320LF2407 made in TI Company. The hardware development of electric control unit of EPS is designed, which includes a core control module, a H-bridge power driver module, a sensor signals process module and a clutch control module. And the circuit board has been examined through the imitation and experiment. From the reference of concerned technical document, the paper established a mathematic model of the system, discussed the control strategy of EPS, and simulated the digital PID control and fuzzy control arithmetic. Finally the control procedure is determined and the design of the software is modularized.