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Abstract
The steering system has experienced many types such as mechanical steering hydraulic Power steering and electric Power steering which is Provides Power directly by electric motor .The power is controlled by ECU .which has many advantages such environmental protection, the low power as the adjusted power the good road feels, the consumes and the convenience maintaining and so on .It has the advantage which the traditional hydraulic power steering is impossible .So it is both a topic hotly talked in current vehicle technology and one of the top techniques. The subject of the development of regenerative braking controller hardware to Freescale the MC9S12DG128 as the control center, including data acquisition module, communication modules, control module. communication modules, including serial port and CAN interface; communication circuit; control module including DC motor circuit and exception handles circuit; Data acquisition module includes wheel speed sensor signal acquisition circuit, torque speed sensor signal acquisition circuit, DC motor signal circuit. And the hardware is verified through the testing. Lower computer program embedded C language, including system initialization module, data acquisition modules, communications modules, control modules. PC program written by VB6.0, include system initialization interface, data acquisition interface. Calibration interface will need to calibrate the parameters of transmission to the next bit machine can also view the lower machine operating parameters, data acquisition interface with the data, the curve of real-time rendering, and data storage. The controller software which divided into lower computer-controller and PC-PC machine two parts, connect o communications and data transmission through the USB-CAN card. The experiment proves that the testing system is feasible and effective Programmed and debugged the corresponding control Procedures. But during the research there are some problems were found needed to be improved and consummated further. Power steering， Design of hardware， Assist characteristic， Control Strategy， Key words： Data acquisition
