Research On EPS Assist Characteristic And Control Algorithm

Electric Power Steering System has development so fast and more and more vehicles have a kind of EPS. EPS resolve the problem of the hydraulic steering system and improve the characteristic of steering control. At the same time EPS reduce the fuel consume and make for the environment. EPS has a tremendous development direction. FAW already worked on the project. This paper is about the simulation of EPS for the project. Electric control unit is the key to the EPS, and it is the main object of this paper . The main content include: study on the characteristic of steering operation; Assist characteristic of object vehicle; perfect steering input; investigate electromotor; trail after the object electric current and the investigation of control strategy. Torque assistance on the Steering column is more proper this time. Use the model of EPS and the carsim vehicle model provided by MSC. All used on the Simulink condition. Make certain the perfect inputting of steering torque is very important but a lot of difficulty to obtain. Assist characteristic of linearity is proper and being adopted. All the process finished by simulation based on test data. The research on control strategy is more complicated, use the PID controller to control the electric current and finish the simulation. Finally, test the steering system of the project vehicle with EPS to testify the assist characteristic and control strategy. The result show the method is available and reasonable.