A method for steering a vehicle, having a front axle with steerable wheels, a rear axle with steerable wheels, having a steering system including as its components a steering wheel operable by the driver and at least one automatic steering module, wherein a manual primary steering intervention is undertaken by the driver of the vehicle for the steering wheel, on the basis of which a manual primary steering reaction occurs for the wheels of the front axle, wherein on the basis of the manual primary steering reaction at least one automatic secondary steering intervention is undertaken with the at least one automatic steering module for the wheels of at least one axle.

A calculator or an electronic control unit (ECU) calculates an instruction value of a column assist torque and a rack assist torque output from a column actuator, or a column motor, and a rack actuator, or a rack motor, based at least on a torsion torque. The calculator includes a base assist controller, a stabilization controller, and an adder. The base assist controller individually or commonly calculates a base assist torque based on the torsion torque. The stabilization controller individually or commonly calculates a stabilization torque for stabilizing a steering system. The adder performs addition of the base assist torque and the stabilization torque.

An electric motor is controlled so as to suppress movement of a steering mechanism in response to a reverse input from a road surface during travel on rough roads, for example, a gravel road or an unpaved road.

An apparatus for reducing vibration of a steering wheel may include: a judder compensation logic unit configured to calculate judder compensation torque for removing a judder which occurs in a steering wheel of a vehicle, based on one or more of a motor current, vehicle speed and vehicle wheel speed; and a judder compensation diagnosis unit configured to determine an operation state of the judder compensation logic unit based on one or more of the vehicle wheel speed, steering torque and a brake state.

Disclosed herein are a motor control apparatus and method. The motor control apparatus includes a compensation signal generator configured to apply a DC-Link voltage (V.sub.Link) for driving a motor to a parameter map preset in order to estimate a gain and phase of a motor torque ripple generated when the motor is driven according to a motor command current and a motor rotation speed, and to generate a compensation signal (i.sub.comp) for compensating for the motor torque ripple corresponding to a current input motor command current (i.sub.q*), motor rotation speed (ω.sub.m), and DC-Link voltage (V.sub.Link), and a current controller configured to control the current of the motor by controlling an inverter such that a compensation command current (i.sub.q*_.sub.comp), generated by reflecting the compensation signal (i.sub.comp), in the motor command current (i.sub.q*), coincides with a motor drive current (i.sub.q) supplied to the motor from the inverter.

An electric power steering device includes a torque sensor provided between a steering wheel and steered wheels mounted on a vehicle body; an assist device that adds an assist force when the steered wheels are steered according to a torque detected by the torque sensor; and a vibration suppressor that outputs a vibration suppressing force from the assist device to suppress a vibration of a steering system according to a signal of a predetermined frequency band of the torque.

A method for operating an electrical power steering system of a transportation vehicle wherein a steering wheel angle is pre-defined by a steering wheel as a measure for a desired wheel steering angle for at least one steerable wheel of the transportation vehicle, where an electrical power drive with an electric motor provides a steering support, and where a support torque of the steering support is reduced based on a damping function in response to the combustion engine of the transportation vehicle being started. Also disclosed is an associated electrical power steering system, to a computer program, and to a control appliance.

An electric power steering apparatus includes a high-frequency compensation unit that outputs a high-frequency compensation signal obtained by filtering the high-frequency components of an assist torque command signal and multiplying the filtered high-frequency components by a gain; a corrected steering torque signal obtained by negatively or positively feeding back the high-frequency compensation signal to a steering torque signal is inputted to an assist torque command calculation unit; the assist torque command calculation unit outputs the assist torque command signal in accordance with the corrected steering torque signal.

The disclosure relates to a method for analyzing and/or at least partially compensating steering wheel torsional vibrations, particularly during operation of a steering device in a vehicle, wherein at least one sensing signal is acquired and at least one interference characteristic variable which is correlated to the steering wheel torsional vibration is extracted from the sensing signal. It is proposed that during a monitoring time interval a change over time in the interference characteristic variable and a change over time in a wheel frequency which is correlated to a current wheel rotational speed characteristic variable is monitored and said changes are combined in order to analyze and/or to at least partially compensate steering wheel torsional vibrations to form a common evaluation dataset.

Disclosed is a steer-by-wire steering apparatus. The steer-by-wire steering apparatus includes a locking portion configured to restrict rotation of a shaft which transfers a steering force or a steering reaction in certain conditions, an actuator which generates torque capable of overcoming a rotation-restricted state of the shaft, and a control portion which determines whether the rotation of the shaft is restricted by a malfunction of the locking portion even though the rotation of the shaft does not correspond to the certain conditions and controls the actuator to generate and provide the torque capable of overcoming the rotation-restricted state of the shaft to the shaft when it is determined that the restriction is caused by the malfunction.