Abstract
The real-time change of road adhesion coefficient has a huge impact on the driver road feeling, easily lead to cause car in the driving conditions of the safety problem. To solve this problem, designing power characteristic curve of the electric power steering (EPS) system based on road adhesion coefficient. With the dynamics models of the vehicle and EPS system are established, this paper reasons and estimates the road adhesion coefficient combining with the method to estimate the maximum aligning torque, moreover, makes a step simulation about the model of EPS under 0.3g lateral acceleration based on Matlab/Simulink platform, and conducts the fitting of power characteristic curve which changes along with road adhesion coefficient and speed based on the driver's ideal handwheel torque. The simulation results show that the power characteristic curve designed meets the requirement of the driver's ideal handwheel torque on the high and low adhesion coefficient road, meanwhile, in the steering driving conditions, the road feeling of the driver on the low adhesion road is the same as that of the normal adhesion road, which can effectively prevent the driver's wrong operation, improving the car active safety.
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