Simulation Model of Electric Power Steering System

The simulation model of Electric Power Steering (EPS) systems represents a significant research topic in automotive electronic control, particularly suitable as an undergraduate graduation project. This model typically requires integration of multidisciplinary knowledge including mechanical dynamics, motor control, and vehicle kinematics, simulating the operational processes of real EPS systems through simulation methods.

When designing the simulation model, the first step involves establishing the dynamic model of the steering system, encompassing the kinematic relationships of mechanical components such as steering wheels, steering columns, and rack-and-pinion mechanisms. Subsequently, the mathematical model of the assist motor must be incorporated, typically using a DC motor model while considering its torque characteristics and current response. The control algorithm section commonly employs PID control or more advanced control strategies to regulate the assist curve.

Simulation platforms can utilize tools like MATLAB/Simulink or CarSim, constructing modular simulation structures to analyze assist performance under various operating conditions. Model validation can be achieved through comparison with actual vehicle data or by referencing industry-standard testing scenarios. This project not only enables students to master fundamental system modeling techniques but also provides deep understanding of modern automotive electronic control system design principles.