ELECTRIC POWER STEERING SYSTEM

摘要

A controller of an electric power steering system includes: a basic assist component computing unit (60) that computes a first assist component (Ta1*) based on a steering torque (Th); a steered angle command value computing unit (61) that computes a steered angle command value (θt*) based on the sum of the steering torque (Th) and the first assist component (Ta1*); and a steered angle feedback controller (62) that computes a second assist component (Ta2*) through feedback control on an actual steered angle (θt). The controller further includes: a correction component computing unit (65) that computes a correction component (Tc*) based on a steering angle (θs); and an assist command value computing unit (50) that computes an assist command value (Ta*) by subtracting the correction component (Tc*) from the sum of the first assist component (Ta1*) and the second assist component (Ta2*).

主权项

1. An electric power steering system comprising:
an assist mechanism that applies assist force generated by a motor to a steering mechanism of a vehicle; and a controller that controls driving of the motor based on an assist command value that is a target value of a torque output from the motor, the controller including
a basic assist component computing unit that computes a first assist component that is a basic component of the assist command value, based on a steering torque applied to a steering wheel,a steered angle command value computing unit that computes a steered angle command value that is a target value of a steered angle of steered wheels, based on a sum of the steering torque and the first assist component,a steered angle feedback controller that computes a second assist component by executing steered angle feedback control for causing an actual steered angle of the steered wheels to follow the steered angle command value,a correction component computing unit that computes a correction component based on a steering angle of the steering wheel, andan assist command value computing unit that computes the assist command value on the basis of a value obtained by subtracting the correction component from a sum of the first assist component and the second assist component.