ELECTRIC POWER STEERING SYSTEM

摘要

In an electric power steering system, a low-pass filter executes a low-pass filtering process on a detected steering torque value detected by a torque sensor. A steering torque deviation computing unit computes a deviation ΔT between a detected steering torque value T* obtained through the low-pass filtering process and the detected steering torque value detected by the torque sensor. A PI control unit generates a vibration compensation value used to lead the detected steering torque value to the steering torque value obtained through the low-pass filtering process, by executing PI computation on the steering torque deviation computed by the steering torque deviation computing unit.

主权项

1. An electric power steering system that applies steering assist force from an electric motor to a steered mechanism that transmits steering force to steered wheels, comprising:
a vehicle speed detecting unit that detects a vehicle speed; a steering angle detecting unit that detects a steering angle; a steering velocity detecting unit that detects a steering velocity; a steering torque detecting unit that detects a steering torque; a target steering torque value setting unit that sets a target steering torque value based on a detected steering angle value detected by the steering angle detecting unit, a detected vehicle speed value detected by the vehicle speed detecting unit, and a detected steering velocity value detected by the steering velocity detecting unit; a target current value computing unit that computes a target current value for leading the detected steering torque value to the target steering torque value, based on the target steering torque value set by the target steering torque value setting unit and the detected steering torque value detected by the steering torque detecting unit; and a control unit that controls the electric motor based on the target current value computed by the target current value computing unit.