On the basis of the market demand, our company proposed to upgrade the power steering system of some cars, from hydraulic power steering to electric power steering (EPS). First of all, the system match of key parts was discussed. For determine of assist characteristics curve, the handling characteristics of the car were tested, and then the speed coefficient was fitted out according to the results. EPS system simulation model was established based on MATLAB/SIMULINK, the aligning and damping control strategies were formulated and the parameters were optimized. EPS controller was designed and the hardware-in-the-loop simulation test-bed based on DSPACE was built. Some tests were implemented on the bed and the results showed that the control strategies were effective and the controller can meet the requirements.
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