A method for operating a power steering system (12) of a vehicle (10) comprises the following steps: a) preparation and/or calculation of a characteristic curve (a), which indicates a power assistance (F.sub.1) to be applied by the power steering system (12) as a function of a driver manual torque (M), b) determination of an initial steering angle s (x.sub.1) of a steering wheel (24), c) determination of a disturbing force, which acts on a steering train (22) of the vehicle (10) due to external forces, d) compensation for the disturbing force by means of an applied compensating force (F.sub.3) in such a way that a steering rack force (F.sub.2) at the initial steering angle (x.sub.1) assumes an initial value, in particular the initial value zero, and e) application of a synthesized steering rack force (F.sub.4) to produce a desired driving feel.

A power steering system and a vehicle comprising such a power steering system are furthermore described.

An alignment tool for a work vehicle includes: an axle housing connecting portion having a housing mating feature configured to mount to a respective mating feature of an axle housing; and a steering knuckle connecting portion coupled with the axle housing connecting portion and having a knuckle mating feature configured to mount to a respective mating feature of a steering knuckle, the steering knuckle connecting portion being coupled to the axle housing connecting portion and angled with respect to the axle housing connecting portion such that the housing mating feature is mountable to the mating feature of the axle housing and the knuckle mating feature is mountable to the mating feature of the steering knuckle only when the steering knuckle is at a fully steered position.

Provided is an actuator for a steering system, which can be increased in degree of freedom for design change, regardless of a configuration change of a hydraulic power steering side. The actuator for a steering system comprises a transmission mechanism configured to transmit the rotation of a steering shaft to a steered wheel, a piston disposed in the transmission mechanism, and a pair of pressure chambers configured to generate a force acting to move the piston. The actuator for a steering system is disposed between a hydraulic power steering system, which imparts a steering force to the steered wheel along with the movement of the piston, and a steering wheel. The actuator for a steering system includes an input shaft which is rotatably and axially supported by the housing and disposed in the steering wheel side; an output shaft which is rotatably and axially supported by the housing and disposed in the hydraulic power steering system; a torsion bar connecting the input shaft and the output shaft; a motor rotor disposed around the outer periphery of the output shaft within the housing and configured to rotate integrally with the output shaft; a motor stator disposed around the outer periphery of the motor rotor within the housing; and a rotation angle detecting section disposed within the housing and configured to detect the rotation angles of the input and output shafts or a relative angle of the input and output shafts.

A torque index sensor may be provided which comprises: a substrate; a first cover which accommodates the circuit board; a first hall sensor and a second hall sensor which are disposed on the circuit board; a magnet seating member which is coupled to the stator; a second magnet which is coupled to the magnet seating member; and a second cover made of a metal material coupled with the first cover, wherein the magnet seating member and the second magnet are disposed between the first cover and the second cover, wherein the second cover comprises: an upper plate on which a through hole is formed; and a side plate which extends in the rotational axis direction from the upper plate, and wherein the side plate comprises a groove formed at a position corresponding to the hall sensor.

A control steered angle calculation unit includes: an end position determination unit that determines whether a rack shaft is located at either one of right and left rack end positions; a motor absolute angle calculation unit that detects a motor absolute angle; an end position-corresponding motor angle setting unit that, when the rack shaft is determined to be located at either one of the right and left rack end positions, sets the detected motor absolute angle as an end position-corresponding motor angle corresponding to the one of the right and left rack end positions; and a control steered angle origin setting unit that calculates an average value of right and left end position-corresponding motor angles as an offset angle, and sets an angle obtained by subtracting the offset angle from the detected motor absolute angle as an origin of the control steered angle represented by the motor ab solute angle.

A steering control device includes an electronic control unit. The electronic control unit is configured to perform end contact relaxation control for correcting a current command value such that a decrease of an end separation angle indicating a distance of an absolute steering angle from an end-position-corresponding angle is limited when the end separation angle is equal to or less than a predetermined angle and to perform partial release control for decreasing a correction value of the current command value due to execution of the end contact relaxation control based on a steering torque which is input to a steering system when a vehicle is intended to travel while turning at the time of execution of the end contact relaxation control.

Disclosed is an automatic adjustment system for a steering wheel provided in a process line to support wheel alignment operation of a vehicle mounted with an OBD, includes a scanner for recognizing a vehicle identification number entered into the process line; an antenna that connects the OBD of the vehicle with the wireless diagnosis communication to transmit and receive data; a robot moves a vision sensor mounted on the front end portion thereof to the shooting position of the steering wheel in the vehicle through the attitude control, when the vehicle is seated in a centering position; and a control apparatus that analyzes the shooting image of the vision sensor to calculate the current distorted angle of the steering wheel and initialize by inputting the current distorted angle of the steering wheel to the steering angle sensor via the diagnosis communication connected with the OBD of the vehicle.

Embodiments of the disclosure disclose a method and an apparatus for calibrating a vehicle control parameter, an on-board controller, and an autonomous vehicle; one embodiment of the method comprises: executing a calibrating step in response to reaching a preset update condition, the calibrating step comprises: obtaining a current offset data set, wherein the current offset data in the current offset data set are determined in a period of time including a current time point; determining a current offset data reference value for characterizing a value feature of the current offset data set; and performing offset correction for the vehicle control parameter based on an offset between the current offset data reference value and a historical offset data reference value. This embodiment implements autonomous calibration of the vehicle parameter based on changes of vehicle offset, such that the vehicle may accurately follow a corresponding control indicator.

A rotation angle detection device includes at least one target rotating in unison with a shaft, a rotating member for rotating at a different rotation speed from the shaft as the shaft rotates, a first sensor whose output signal changes when the target is approached, a second sensor that detects the rotation angle of the rotating member within one rotation, and a computing section that calculates the absolute angle of the shaft based on the output signal of the first sensor and the rotation angle of the rotating member detected by the second sensor. The output signal of the first sensor changes at a period different from the rotation period of the rotating member when the shaft rotates, and the computing section detects the absolute angle of the shaft at that time from the rotation angle of the rotating member when the output signal of the first sensor changes.

A method for estimating the absolute angular position of a steering wheel equipping a power-steering device, referred to as relative steering wheel position, of the shaft of a power-steering motor is assessed, a first estimation (Angle1) of the absolute angular position of the steering wheel is assessed from at least one first model using the speed difference between the left and right rear wheels, a first dynamic offset equal to the difference between the first estimation (Angle1) of the absolute angular position of the steering wheel and the relative steering wheel position is estimated, and the absolute angular position of the steering wheel is calculated by adding to the relative steering wheel position a total compensation offset determined from the first dynamic offset, also when restarting the vehicle, a switching-off offset corresponds to the value of the total compensation offset at the time when the vehicle was previously switched off.