A bearing arrangement may be used to mount a worm shaft meshing with a worm wheel in a housing of an electromechanical power steering system. The bearing arrangement comprises a first rotary bearing, a second rotary bearing, and a pivoting ring. The first rotary bearing is configured to permit a pivoting movement of the worm shaft. The pivoting ring comprises a first pivoting ring component and a second pivoting ring component and is configured to act resiliently between the second rotary bearing and the housing. The second rotary bearing is at least partially arranged between the first pivoting ring component and the second pivoting ring component. The first pivoting ring component has two first points, with respect to which the first pivoting ring component is configured resiliently. The second pivoting ring component has two second points, with respect to which the second pivoting ring component is configured resiliently.

To provide an AC rotary machine apparatus which can determine the operation stop of the control circuit of the other system with good accuracy. An AC rotary machine apparatus, including: a resolver is provided with a first system excitation winding, first system two output windings, a second system excitation winding, and second system two output windings, in which a magnetic interference occurs between a first system and a second system; a first system control circuit that applies AC voltage with a first period to the first system excitation winding; and a second system control circuit that applies AC voltage with a second period to the second system excitation winding, wherein the first system control circuit determines whether the operation of the second system control circuit stops, based on the components of the second period extracted from the first system output signals.

Provided is a reducer of an electric power steering apparatus. The reducer has a significantly reduced volume, a decreased number of components, and a shortened production process and can prevent vibration and noise generated during power transfer while removing noise caused by a clearance between a shaft and a power transfer member.

A steering control device includes a first control system and a second control system. The first control system includes and a first microcomputer. The first microcomputer is configured to compute a first command value for controlling power supply to a first coil and a second command value for controlling power supply to a second coil. The second control system includes and a second microcomputer. The second microcomputer is configured to compute the first command value and the second command value. The first microcomputer and the second microcomputer are configured to communicate the first command value and the second command value with each other. The cycle of communication between the first microcomputer and the second microcomputer is set to be equal to or shorter than each of the cycles of computations of the first command value and the second command value by the first microcomputer and the second microcomputer.

A power steering assembly includes an electric motor having an output shaft extending therefrom. The assembly also includes a housing containing a worm gear operatively coupled to a steering shaft, the worm gear rotatable about a worm gear axis. The assembly further includes an electric motor and a worm arranged to engage the worm gear, the worm extending from the output shaft of the electric motor as a single, integrally formed shaft, the single, integrally formed shaft extending axially from a first end to a second end and being cantilevered to allow the second end to deflect. The assembly yet further includes a bushing surrounding a portion of the shaft proximate the second end of the shaft, the bushing and the portion of the shaft defining a clearance therebetween.

A position measurement system for a steering system includes a steering shaft. The position measurement system also includes a worm gear coupled to the steering shaft. The position measurement system further includes a worm in meshed engagement with the worm gear, the worm driven by a motor. The position measurement system yet further includes a first sensor operatively coupled to the worm to detect an angular position of the worm and the motor that drives the worm. The position measurement system also includes a driving gear coupled to the steering shaft. The position measurement system further includes a spur gear in meshed engagement with the driving gear. The position measurement system yet further includes a second sensor operatively coupled to the spur gear to detect an angular position of the spur gear.

A method for controlling an assist motor of a power steering system, power steering system including the assist motor configured to apply a motor torque on a rack, and at least one steering computer, method being designed to servo-control a position of the rack to a position setpoint, method including: a maneuvering step in which the assist motor exerts a motor torque on the rack according to a motor torque setpoint; wherein the method also includes: servo-control step in which the steering computer determines a speed setpoint of the rack according to the position setpoint and to the position of the rack; limitation step in which the steering computer issues a limited speed setpoint which is lower than or equal to a maximum speed threshold; control step in which the steering computer determines the motor torque setpoint according to the limited speed setpoint and to a speed of the rack.

A method of steering steerable wheels of a vehicle includes determining a first angle of a first portion of a steering column. A second angle of a second portion of the steering column is determined. The first and second angles are compared to determine a difference between the first and second angles. The vehicle is steered autonomously if the difference between the first and second angles is above a predetermined amount and a time that the difference between the first and second angles is above the predetermined amount is greater than a predetermined amount of time.

A steering control device includes an electronic control unit. The electronic control unit is configured to calculate a target rotation angle of a shaft rotating with a turning operation of turning wheels based on a steering angle of a steering wheel acquired from a rotation angle of a reaction motor, to calculate a command value based on the target rotation angle and a steering torque acquired from a torsion angle of a torsion bar twisting with an operation of the steering wheel, and to compensate for the torsion angle by adding the torsion angle as a compensation value to the steering angle. The electronic control unit is configured to change a value of the torsion angle that is added to the steering angle according to a degree of change of a state variable used to calculate the command value.

A motor-driven power steering system for a vehicle is configured such that movement of the worm shaft and a clearance caused by backlash between the worm wheel and the worm shaft may be prevented using the bearing-integrated damper bush which is coupled to the end portion of the worm shaft and is made of steel, and during of rotation of the worm shaft, the lubricant is supplied between the worm shaft and the bearing-integrated damper bush to facilitate lubrication and cooling.