Sensor Fault-Tolerant Control of Electric Power Steering for Electric Vehicles

The existing research of the electric power steering (EPS) system less focuses on the safe and reliable operation. Especially the application of fault-tolerant theory to EPS of electric vehicles (EV) actually. In this paper, EPS is built based on sensor fault-tolerant control for EV. Then, the riccati equation is introduced constantly correcting weight matrix Q and R. Finally, a co-simulation analysis is conducted in MATLAB to evaluate the proposed fault-tolerant controller. It is shown that the design had a positive effect in that it could effectively improve performance due to sensor failure. And, a rapid control prototype is built based on dSPACE, a hardware-in-the-loop simulation platform, in order to conduct a real EV test. The results of test are consistent to the simulation and verified the correctness of simulation. The proposed research ensures the steering safety, enhances the EPS stability, and improves the driving comfort.