A steer-by-wire steering system for a vehicle, including: an operating member operable by a driver; a dual-system steering device including two systems each of which includes an electric motor as a drive source, the steering device being configured to steer a wheel; and a controller configured to control a current to be supplied to each of the electric motors of the respective two systems so as to cause the steering device to steer the wheel in accordance with an operation of the operating member, wherein the controller is configured to prohibit the current greater than an upper limit value from being supplied to the electric motors of the respective two systems, and wherein, when the wheel is steered only by only one of the two systems, the controller raises the upper limit value of the current to be supplied to the electric motor of the one of the two systems.

A rotary electric machine control device for controlling a rotary electric machine having multiple winding sets includes multiple inverter circuits, multiple power supply relays, and multiple controllers provided for respective systems. Each of the controllers is configured to monitor an abnormality of a subject system and an abnormality of a different system and is configured to turn off a power supply relay in the subject system when an abnormality requiring a power supply stop occurs in the subject system. Each of the controllers is further configured to acquire power supply relay information related to a state of the power supply relay of the different system through a signal line, and is configured to monitor the abnormality of the different system based on the power supply relay information.

Control circuits control inverter circuits provided in correspondence to the control circuits by a drive mode selected from a plurality of drive modes. A cooperative drive mode is for controlling a current supply to motor windings by a plurality of systems by using a value acquired from the other control circuit via communication. An independent drive mode is for controlling the current supply to the motor windings by the plurality of systems without using the value acquired from the other control circuit. A one-system drive mode is for controlling the current supply to the motor winding by one system without using the value acquired from the other control circuit. The control circuits set the drive mode to a cooperative drive mode when inter-computer communication is normal. The control circuits set the drive mode to an independent drive mode or a one-system drive mode thereby differentiating an output characteristic of a motor from that in the cooperative drive mode.

The present embodiments relate to an inductor device, a filter device and a steering assist device. The inductor device can comprise: a core including a magnetic material; and a wire which is wound around the core and which includes a low resistance material.

A method includes receiving motor velocity data, and, in response to a determination that the motor velocity data indicates that a velocity of a motor is below a threshold velocity: calculating a thermal metric corresponding to a phase imbalance of the motor; identifying at least one thermal mitigation parameter based on the thermal metric; generating at least one thermal management motor position command based on the at least one thermal mitigation parameter; and selectively controlling the motor according to the thermal management motor position command.

An ECU, which is a signal control apparatus, has a plurality of control units, which control one same motor. Steering angle calculation units acquire sensor signals from the angle sensors provided corresponding to the steering angle calculation units, respectively, and calculate the steering angles in correspondence to the sensor signals. The angle FB units perform the angle FB control based on the angle differences, which are between the target angle and the steering angle and between the target angle and the steering angle, respectively. In the angular FB unit of at least one of the control units, the angular feedback control is performed using the angle difference, which is subjected to the correction processing to reduce the error between the detection angle of the own system and the detection angle of the other system calculated by the steering angle calculation unit of the other control unit.

A control unit determines a presence or absence of a short-circuit failure with respect to a target switch which is a phase-opening switch to be determined. At this time, after opening all the phase opening switches, the control unit drives an inverter to connect a power supply line provided with the target switch among the phase opening switches to ground. The control unit determines that the target switch has a short-circuit failure when a voltage of the power supply line in which the target switch is not provided is smaller than a predetermined voltage.

An electric power steering apparatus and a control method thereof. A motor includes a first motor providing power to move a rack and a second motor providing power to move the rack in synchronization with the first motor. A sensor includes a torque angle sensor detecting a torque value and a steering angle in response to manipulation of a steering wheel and an angle sensor detecting an angle of rotation of a sector shaft. A controller controls the motor in response to the manipulation of the steering wheel, calculates an amount of compensation rotation of the motor by comparing the steering angle and the angle of rotation, and controls an amount of rotation of the motor in accordance with an amount of compensation rotation. The amount of rotation of a vehicle's wheel is controlled, so that actual intention of the driver in steering is accurately reflected.

An electronic steering control apparatus to which a redundancy system is applied and which includes a first position controller and a second position controller. When communication is established between the first and second position controllers, the first position controller controls the position of a first motor based on command steering angles θ.sub.1 and θ.sub.2 from a control unit and feedback steering angles θ.sub.m1 and θ.sub.m2 from the first motor and a second motor, and the second position controller controls the position of the second motor based on the command steering angles θ.sub.1 and θ.sub.2 from the control unit and the feedback steering angles θ.sub.m1 and θ.sub.m2 from the first motor and the second motor.

According to one or more embodiments, a motor control system that provides torque ripple compensation includes a current regulator that receives a first current command corresponding to an input torque command. The current regulator further generates a first voltage command based on the first current command using a first transformation matrix. The current regulator further receives a second current command corresponding to a torque ripple to be compensated. The current regulator further generates a second voltage command based on the second current command using a second transformation matrix. The current regulator further computes a final voltage command using the first voltage command and the second current command, the final voltage command being applied to a motor.