The Application Of GPS In The Research And Design Of Electronic Power Steering System

Vehicle's steering system is the most important system to achieve the intention of the driver's operation, control the vehicle statement and handing stability. Electronic Power Steering System is the focus of the recently research and Applications. It has the characteristic of few component, simple architecture, energy-saving environmental protection, easy fix and maintenance. It is the direction of the future power steering technique. It is hopeful to be the standard component. It is the maintenance of power steering.First, introduced the development and application of GPS in the research of vehicle handling stability and EPS based on the published papers. It can be concluded that the application of GPS is an important method in vehicle front-steering handling and stability research.Second, based on the research of the architectur and operational principle of EPS. Using the kinematics and dynamics to establish the EPS model and Bicycle model. Proposed the method of measure the slip angle and yaw rate using GPS real-time differential positioning technology and INS sersor, analysed the errors of the system. Using Carsim and Simulink software co-simulation, verify the bicycle vehicle model used in the field of vehicle stability control is feasible.Third, analysed the reasons for the stability of the vehicle to lose. Focuse on the impact of vehicle stability by the yaw rate and slip angle. Proposed GPS-based vehicle stability control strategy. Designed the GPS-based EPS controller. Focuses on the composition of the controller, master controller, GPS interface circuit, and steering motor drive circuit.Finally, verified the correctness of GPS-based vehicle stability control strategy and the utility of GPS-based controller by Open-loop Control Test, Understeer Control Test, Oversteer Control test, Uneven distribution of quality Control Test.