A turning angle detecting device includes: a first storage unit configured to store a turning angle neutral point correction value being a difference between a median of the turning angles at respective limits in right and left steering and the turning angle in a straight traveling state; a second storage unit configured to store an initial position of a movable portion of an actuator of a wheel turning mechanism in the straight traveling state; a first turning angle calculating unit configured to calculate a first turning angle with respect to the median of the turning angles at the respective limits based on a detection value of a position of the movable portion; and a second turning angle calculating unit configured to calculate a second turning angle based on the detection value, the turning angle neutral point correction value, the initial position and the first turning angle.

An object of the present invention is to provide a rotational angle detection apparatus and a power steering apparatus capable of detecting a rotational angle of a rotational shaft eve when a failure has occurred in a magnetic detection portion. One aspect of the present invention is a rotational angle detection apparatus including a first magnetic detection portion provided on a rotational axis and configured to detect a change in a magnitude or a direction of a magnetic field, and a second magnetic detection portion provided on the rotational axis and disposed at a position offset from the first magnetic detection portion in a direction along the rotational axis. The second magnetic detection portion is configured to detect the change in the magnitude or the direction of the magnetic field. The rotational angle detection apparatus further includes a magnet provided on an outer side in a radial direction of the rotational axis with respect to the first magnetic detection portion and the second magnetic detection portion and disposed in such a manner that an N-pole and an S-pole face each other around the rotational axis. The magnet is provided rotatably relative to the first magnetic detection portion and the second magnetic detection portion. The rotational angle detection apparatus is configured to detect a rotational angle of the magnet relative to the first magnetic detection portion and the second magnetic detection portion based on signals output from the first magnetic detection portion and the second magnetic detection portion.

The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.

A steering system circuit arrangement for operating an electric motor comprised by a steering adjuster may include a control unit and either a first sensor unit, which is designed to provide first input signals, or a second sensor unit, which is designed to provide second input signals that are different from the first input signals. The control unit is configured to both receive the first input signals provided by the first sensor unit and to provide an actuation signal for the electric motor by taking account of these received first input signals, and to receive the second input signals provided by the second sensor unit and to provide the actuation signal by taking account of these received second input signals. Further, an electromechanical steering system may include such a circuit arrangement. Methods for producing and operating such steering systems may also be utilized.

A steering angle detecting apparatus for vehicles includes a vernier calculating section that performs vernier calculation based on a steering shaft angle and a motor angle, a neutral period specifying section that specifies a neutral period including a neutral point based on a reference angle calculated by the vernier calculation in the vernier calculating section, and a neutral point specifying section that specifies the neutral point from the neutral period and a stored neutral point value, and outputs a steering angle the neutral point of which is specified.

A steering system for a motor vehicle, having a steering column, an electromechanical steering assistance apparatus, a sensor which is assigned to the steering column and is configured to sense a torque and a rotational angle of the steering column, and a regulator, wherein the electromechanical steering assistance apparatus comprises a motor having an angular position encoder which is configured to sense the motor rotational angle of the motor, wherein the regulator is configured to determine a torque of the electromechanical steering assistance apparatus, and wherein the regulator is also configured to determine a disturbance variable, which gives rise to an undesired steering sensation, in the steering system by means of a Kalman filter.

In a rotation detecting apparatus, a sensor includes a sensor element outputting a measurement value representing rotation of a detection target, and a circuit module. The circuit module includes a rotational angle calculator calculating, based on the measurement value, rotational angle information indicative of a rotational angle of the detection target. The rotational angle calculator generates a rotational angle signal including the rotational angle information. The circuit module includes a rotation number calculator calculating, based on the measurement value, rotation number information representing the number of rotations of the detection target. The rotation number calculator generates a rotation number signal including the rotation number information. An output unit outputs, as an output signal, a series of the rotational angle signal and the rotation number signal. A controller obtains the output signal from the communicator, and calculates, based on the output signal, information about the rotation of the detection target.

Embodiments of the disclosure relate to a steering assist device and method, and a steering system. The steering assist device comprises an input-side steering control module controlling an input-side steering actuator to assist an input-side mechanism connected with a steering wheel and an output-side steering control module controlling an output-side steering actuator to assist an output-side mechanism mechanically separated from the input-side mechanism and connected with a wheel. The output-side steering control module may control an output-side steering motor based on a position sensing value of the output-side mechanism and a position sensing value of an output-side steering motor included in the output-side steering actuator, which are received from their respective sensors.

One aspect of the present invention increases or reduces an amplitude or amplitudes of a steering angle sensor output signal and/or a motor rotational angle signal, and outputs a motor instruction signal based on a substitute signal for a torque sensor output signal that is calculated based on at least one of the steering angle sensor output signal and the motor rotational angle signal that is subjected to the adjustment of the amplitude thereof, and the other of the steering angle sensor output signal and the motor rotational angle signal, when an abnormality is detected in the torque sensor output signal.

Please replace the original Abstract with the following new Abstract: A steering system for a vehicle includes a steering gear, two knuckles of two steerable wheels, a steering actuator, a plurality of sensors, and a processing unit. The steering gear is connected to a first knuckle of the two knuckles and the steering gear is connected to a second knuckle of the two knuckles. The steering gear is connected to the steering actuator. The sensors are mounted at locations associated with the steering gear. Each of the plurality of sensors is configured to acquire steering system position information. Each of the plurality of sensors are configured to provide acquired steering system information to the processing unit.