| Electric Power Steering System (EPS) is one of the research focuses of automotive engineering. Based on the study of the operation principles of EPS, the present thesis designed and developed the Electronic Control Unit (ECU) and the software program of the ECU of EPS, also carried out the bed test.Considering the functions of the electronic control unit of EPS, the present thesis studied and developed the hardware that adopted ARM S3C44B0X as its microprocessor. The control unit was able to realize real-time data/signal acquisition and system control. The target current of motor output could be determined by the obtained data; and utilizing the Pulse-Width Modulation (PWM) technology, power could be provided to the steering system by controlling the output current and rotation direction through H-bridge circuit.The software program, which was divided into the realization of control strategy and the acquisition & control of data/signal, was developed in modular after the design of experimental ECU was completed. PD control arithmetic was used in EPS and the simulation analysis was carried out. And the main program, A/D acquisition program, speed signal acquisition program and PWM control program are developed in the second part.At last, the present thesis introduced the innovative bed test device, by which the bed test on circuit and software system was performed, as well as analyzed and demonstrated the test result. The result showed that the electronic control unit designed was with stable performance, appropriate structure and excellent matching condition, and the excellent power steering effect could be ensured by EPS.
|
PDF Full Text Request