A control circuit connected to a control device configured to control a motor connected to a rotation shaft that is convertible into a turning angle of a turning wheel, the control circuit includes a main circuit configured to calculates a rotation number indicating a rotational state of the rotation shaft based on a detection signal from a rotation angle sensor configured to detect a rotation angle of the motor as a relative angle, a detection result communication unit configured to detect whether or not there is an abnormality in the main circuit and output a detection result to the control device, and a pseudo abnormality generating unit configured to set the detection result to be abnormal based on a pseudo abnormal signal from the control device.

A redundant control device for a three-phase electric motor of a steering system of a motor vehicle, having a primary control path and a secondary control path. The primary control path has a primary processing unit, and the secondary control path has a secondary processing unit. The primary control path is connected to a first phase winding of the electric motor, and the secondary control path is connected to a second phase winding and a third phase winding for actuating the electric motor, wherein each phase winding is assigned an individual converter.

A drive controller according to an aspect controls drive of a three-phase motor, and includes an electric value calculation unit that calculates an electric value in each of coordinate axes of rotating coordinates of the three-phase motor based on an electric value that is at least one of a current value and a voltage value generated in the three-phase motor, and a fault determination unit that determines a fault phase having a fault in phases of the three-phase motor by combining positive-negative information on at least one of a difference between a calculation electric value calculated by the electric value calculation unit and a target electric value indicating a control target of an electric value in each of the coordinate axes, and a variation of the difference, with each of the coordinate axes.

A steering wheel unit is equipped with an electrode which is provided on a steering wheel and constitutes an electrostatic capacitance sensor, a sensor circuit that passes an alternating current to the electrode, a comprehensive control unit adapted to energize the sensor circuit at a time of failure diagnosis, and a failure diagnosis unit that performs a short circuit failure diagnosis continuously or periodically when a power source of a vehicle is on, and performs an open circuit failure diagnosis when the power source of the vehicle is switched from off to on.

A steering apparatus and method for a vehicle. Steering controllers are connected via an internal communications network. Each of the steering controllers monitors the operating state of another steering controller using the internal communications network, so that, if one of the steering controllers currently controlling the steering motor operates abnormally, the steering motor is controlled by at least one steering controller of the remaining steering controllers.

A current sensor state determination device determines that an abnormality is caused in a current sensor when a sum of phase currents based on current detection values from each of the current sensors in three phases is greater than a first determination value, and determines that no abnormality is caused in the current sensor when the sum of phase currents is equal to or less than the first determination value. The state determination device determines that the current sensor is normal when it is determined that (i) no abnormality is caused in a preset electric angle range equal to or less than one electric-angle cycle of the rotating electric machine and (ii) a value of an electric current flowing in the rotating electric machine in a rotating coordinates system calculated based on the current detection value is equal to or greater than a second determination value.

A power steering device includes a steering mechanism structured to steer a steerable wheel in accordance with steering of a steering wheel. A first sensor is structured to sense a specific state quantity of steering. A second sensor is structured to sense the specific state quantity. A first actuation part is structured to apply a steering force to the steering mechanism. A second actuation part is structured to apply a steering force to the steering mechanism. A first microprocessor is configured to receive an output signal from the first sensor, and control driving of the first actuation part based on the output signal received from the first sensor. A second microprocessor is configured to receive an output signal from the first sensor and an output signal from the second sensor, and control driving of the second actuation part based on the output signal received from the first sensor.

A steering device installed on a vehicle including a plurality of steerable wheels and configured to independently steer a wheel which is one of the plurality of steerable wheels, including: an electric motor as a drive source; a motion converting mechanism configured to convert a motion of the electric motor into a steering motion of the wheel; and a controller configured to control a supply current to the electric motor so as to achieve steering of the wheel corresponding to a motion position of the electric motor, wherein, to eliminate a discrepancy between the motion position of the electric motor and a steering position of the wheel detected hosed on the supply current to the electric motor supplied when the motion position of the electric motor is maintained at a straight-traveling-state position, the controller executes a reference change process of changing a setting of the straight-traveling-state position.

The present disclosure relates to a rear-wheel steering system and a controlling method thereof. The rear-wheel steering system includes: a rack configured to transmit a driving force generated from a rear-wheel steering motor to rear wheels; a first correction module configured to, when an engine is started, detect a position of the rack using a displacement sensor and calculate a first correction value that is a difference between the detected position and a neutral position; a second correction module configured to, when the engine is started, detect a position of the rack using a motor position sensor that detects a rotation angle of the rear-wheel steering motor and calculate a second correction value that is a difference between the detected position and the neutral position; a comparison determiner configured to compare the first correction value and the second correction value to determine whether the displacement sensor has malfunctioned; and a steering controller configured to control an operation of the rear-wheel steering motor. Accordingly, it is possible to determine whether an error occurs in the displacement sensor and to return the rack to the neutral position even when the error has occurred in the displacement sensor.

A torque sensor is configured to detect torque even when an abnormality has occurred in one magnetic sensor among multiple magnetic sensors. An electric power steering apparatus using the torque sensor is provided. The torque sensor includes a first magnetic sensor between a first magnetic collection mechanism and a second magnetic collection mechanism, a second magnetic sensor between the first and second magnetic collection mechanisms and disposed at a same position as or a symmetric position to a magnetic environment of the first magnetic sensor, and a third magnetic sensor between the first and second magnetic collection mechanisms and disposed at a same position as or a symmetric position to the magnetic environments of the first and second magnetic sensors. The torque sensor detects torque generated on a rotational member based on an output signal of the first, second, or third magnetic sensor.