Patent ID: 9731751
Date: 2017-08-15
CPC Classifications: B62D

Claim:
1. A steering system comprising: a steering mechanism that is configured to steer steered wheels based on steering of a steering wheel; a motor that is configured to allow the steering mechanism to generate a turning torque that turns the steered wheels; a power supply that is configured to serve as a source of a voltage applied to the motor; a power supply voltage detection circuit that is configured to detect a power supply voltage of the power supply; a steering angle detection circuit that is configured to detect a steering angle formed at the steering mechanism; a calculation circuit that is configured to calculate a voltage command value to allow the motor to generate a predetermined turning torque; a motor control signal generation circuit that is configured to generate a motor control signal to apply a portion of the power supply voltage, which is indicated by the voltage command value, to the motor; a compensation circuit that is configured to calculate a compensation amount including at least a power supply compensation component as one of a plurality of components for compensation for the voltage command value, the compensation circuit deriving the compensation amount by executing calculation for the power supply compensation component based on the power supply voltage when the steering angle is equal to or larger than a predetermined steering angle that is close to a maximum steering angles and a current command value calculation circuit that is configured to calculate a current command value, wherein the motor control signal generation circuit that is configured to calculate the voltage command value by performing current feedback control that allows an actual current value to follow the current command value.