A detection unit has a rotation angle sensor including at least three detection elements detecting a change of physical quantity and outputting angle signals respectively corresponding to detection values of the respective detection elements. The detection unit also has a controller including an abnormality monitor monitoring the angle signals and identifying the respective angle signals either as a normal signal or an abnormal signal. The controller either outputs a value corresponding to at least one of two normal signals when two or more normal signals are identified or stops output regarding the detection signal when two or more normal signals are not identified.

A detection unit has a detection element for detecting a change of magnetic field according to a rotation of a magnet, and an angle calculator for calculating an angle signal according to a detected physical quantity detected by the detection element. Further, a storage stores a plurality of correction values for correcting detection error of the angle signal, and another storage stores a plurality of correction values for correcting detection error of the angle signal. An abnormality determiner determines abnormality of the correction values, an another abnormality determiner determines abnormality of the correction values. A control calculator performs a control calculation by using the angle signals corrected by using the correction value having been determined as normal.

In a detection unit, a control unit includes an abnormality monitoring unit and a control calculation unit, and obtains an angle signal from different sensor units. The abnormality monitoring unit monitors abnormality of the angle signal. The control calculation unit performs calculation by using the angle signal. A second control unit obtains the angle signal by communication with a first control unit, i.e., from an other control unit. The abnormality monitoring unit, when comparing a subject system calculation value with an other system calculation value, uses a communication delay corrected value which has a correction of communication delay as at least one of the subject system calculation value and the other system calculation value.

A motor electric control unit (ECU) for an electromechanical power steering mechanism, which controls current through an electric assist motor in response to steering mechanism sensors' signals. The ECU may comprise at least two channels. Each channel has the steering mechanism sensors in a redundancy concept. At least one voter that is assigned to an actuator and is configured to vote on the correct steering mechanism sensors' outputs of the at least two channels. The steering mechanism sensors may include a steering column torque sensor and an RPS sensor for sensing a rotor angle of the electric assist motor. Each of the at least two channels may include processors that have different software to protect against systematic faults.

A controller for a motor includes a first processing circuit and a second processing circuit configured to communicate with each other. The first processing circuit is configured to execute a first operation amount calculation process, an operation process, and an output process. The first operation amount calculation process is a process of calculating a first operation amount. The output process is a process of outputting the first operation amount to the second processing circuit. The second processing circuit is configured to execute a second operation amount calculation process, a first use operation process, a second use operation process, and an elimination process.

A steering control device for a steering system includes an electronic control unit configured to: calculate target torque that is a target value of the motor torque; control operation of the motor; calculate a vehicle speed basic axial force based on a detected vehicle speed; calculate another state quantity basic axial force based on a state quantity other than the detected vehicle speed; calculate a distributed axial force by adding the vehicle speed basic axial force and the other state quantity basic axial force at individually set distribution ratios; calculate the target torque based on the distributed axial force; and reduce the distribution ratio of the vehicle speed basic axial force when the detected vehicle speed is abnormal as compared to when the detected vehicle speed is normal.

A sensor device includes a sensor section having a plurality of sensor elements sensing a physical quantity regarding a magnetic flux collecting module, an output circuit generating and outputting an output signal including data signals respectively corresponding to sensing values from the sensor elements, and an ECU obtaining the output signal. The ECU includes an abnormality determiner identifying an abnormal sensor element. When at least two of the plurality of sensor sections respectively have at least one normal sensor element, a sub-sensor section transmits the output signal therefrom to the ECU at a shifted output timing from an output timing of the output signal from a main sensor section. The amount of such a shift of the output timing is shorter than one signal cycle of the output signal.

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 power steering device includes a steering mechanism, an electric motor for applying a steering assist force to the steering mechanism, and a first motor rotational position sensor for sensing as an actual axis phase a rotational position of a rotor of the electric motor. A control device is configured to: receive input of a signal of first actual axis phase outputted from the first motor rotational position sensor; receive input of a signal of value of electric current flowing through the electric motor; estimate as a control phase a phase of an induced voltage occurring in the electric motor, based on the signal of value of electric current; and determine whether or not the first motor rotational position sensor is abnormal, based on a difference between the first actual axis phase and the control phase.

A control device includes a first system and a second system being a redundant system for the first system, and controls a device to be controlled. The control device includes a first abnormality detector detecting abnormality of a first-system circuit constituting the first system, and a second abnormality detector detecting abnormality of a second-system circuit constituting the second system. The first abnormality detector detects existence of abnormality of the first-system circuit by comparing the detected value of a first predetermined part of the first-system circuit with a first threshold. The second abnormality detector detects existence of abnormality of the second-system circuit by comparing the detected value of a second predetermined part in the second-system circuit corresponding to the first predetermined part, with a second threshold different from the first threshold.