A calibration method in which, a rotation angle calculation device (20, 30) calculates (S2) a rotation angle θc based on a detection signal of a sensor, transmits (S3) rotation angle data Dc indicating the rotation angle θc to a calibration device (40), and transmits (S3) time difference data Dt relating to a time difference after having captured the detection signal until transmitting the rotation angle data to the calibration device, and in which the calibration device measures (S1) a rotation angle θr, clocks (S1, S4) a measurement time tm at which the rotation angle θr is measured and a transmission time tt of transmitting or receiving the rotation angle data, and acquires (S5, S6) calibration data Dc of the rotation angle data by comparing the rotation angle θr measured at a time tc2 obtained by going back in time from the transmission time tt by the time difference after having captured the detection signal until transmitting the rotation angle data and the rotation angle data Da with each other.

A steering device includes: a first steering mechanism including a first ball nut steering, and a first motor actuator, the first ball nut steering including a first output shaft, a first ball screw, and a first transmitting mechanism, the first motor actuator arranged to provide a rotation force to the first output shaft, a second steering mechanism including a second ball nut steering, and a second motor actuator, the second ball nut steering including a second output shaft, a second ball screw, and a second transmitting mechanism, the second motor actuator arranged to provide a rotation force to the second output shaft, a connection member arranged to connect the first transmitting mechanism and the second transmitting mechanism so as to interlock a movement of the first transmitting mechanism and a movement of the second transmitting mechanism.

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 calibration method in which, a rotation angle calculation device calculates a rotation angle based on a detection signal of a sensor, transmits rotation angle data indicating the rotation angle to a calibration device, and transmits time difference data relating to a time difference after having captured the detection signal until transmitting the rotation angle data to the calibration device, and in which the calibration device measures a rotation angle, clocks a measurement time at which the rotation angle is measured and a transmission time of transmitting or receiving the rotation angle data, and acquires calibration data of the rotation angle data by comparing the rotation angle measured at a time obtained by going back in time from the transmission time by the time difference after having captured the detection signal until transmitting the rotation angle data and the rotation angle data with each other.

A steering device for a vehicle includes a steering rod and at least one drive unit, wherein the steering rod can be displaced along its longitudinal extent by the drive unit. The steering device also includes at least one first sensor device for determining a displacement position of the steering rod. The steering rod, as seen along its longitudinal extent, exhibits at least one change in its cross section, in particular diameter, wherein the first sensor device is designed to sense the change.

An angle detector including; a magnet being mounted on a rotation axle and that has a first track magnetized in P pole-pairs and second track magnetized in Q pole-pairs, a first hole device group that senses magnetic flux from the first track, a second hole device group that senses magnetic flux from the second track, a first detection unit that outputs an M-step absolute angular signal through division of one electric-angle rotation into M sections, a second detection unit that outputs an N-step relative angular signal through division of each of the M divided sections into N sections, an angle calculation unit that divides the one electric-angle rotation into [M×N] sections and calculates an [M×N]-step electric angular signal, based on the absolute angular signal and the relative angular signal, and an angle correction unit that outputs a correction angle supplemented so as to smooth the electric angular signal.

The power management unit supplies first power that is continuous power to the second sensor when the power switch is on, supplies second power that is intermittent power having a voltage lower than the first power to the second sensor when the power switch is off, and outputs rotation number information representing a rotation number of the motor rotation shaft based on the second sensor signal. The power management unit includes a comparator that operates using the second power as the power source when the power switch is off and compare the second sensor signal and the reference voltage, and a counter that detects the rotation number of the motor rotation shaft by counting the output of the comparators.

A method for estimating torsion bar torque includes receiving, from a first sensor, a handwheel position value indicating a position of a handwheel of a steering system and receiving, from a second sensor, a motor position value indicating a position of a motor of the steering system. The method also includes estimating a torsion bar torque value using the handwheel position value and the motor position value

An electric power steering apparatus includes: a torque sensor configured to detect a steering torque of a driver; a motor configured to assist in a steering force of the driver; a rotation angle estimation unit configured to estimate a rotation angle of the motor to output an estimated angle; a correction signal calculation unit configured to calculate a correction signal based on the steering torque; a frequency separation unit configured to separate the estimated angle into a first frequency component and a second frequency component; an estimated angle correction unit configured to calculate, as a control angle, a value obtained by adding a second-frequency-component corrected signal, which is obtained by correcting the second frequency component based on the correction signal, to the first frequency component; and an electric power supply unit configured to supply electric power to the motor based on the control angle.

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.