A steering system for a steerable vehicle includes at least two steerable wheels, to each of which an electrically operable steering actuator to enable the steering actuator to adjust the steering angle of the particular steerable wheel by application of a steering torque. The at least two steering actuators can be mechanically coupled to each other so that, in the event of a failure or a malfunction of the one steering actuator, the steering torque provided by the other steering actuator can be transferred to the one steering actuator, to enable the steering angle of the steerable wheel assigned to the failed steering actuator to still be changed via the other steering actuator. The at least two steering actuators can be mechanically coupled to each other via a bendable shaft or via a universal joint shaft which includes at least two rigid shafts hingedly connected via a universal joint.

A steer-by-wire steering system for a vehicle is disclosed, comprising a steering wheel unit, connected with a wheel unit. The steering wheel unit has a steering wheel angle sensor, a steering wheel actuator for setting a steering wheel target torque, and a steering wheel controller for actuating the steering wheel actuator. The wheel unit has a steering sensor for capturing at least one actual steering value, a wheel actuator for setting a target steering value, and a wheel controller. The wheel controller is designed to calculate a virtual torsion rod torque based on the target steering value and the actual steering value, to actuate the wheel actuator based on the calculated virtual torsion rod torque, and to transfer the calculated virtual torsion rod torque to the steering wheel unit. The steering wheel controller is designed to calculate the steering wheel target torque based on the transferred virtual torsion rod torque.

An electric power steering system includes a basic assist amount calculation section calculating a basic assist amount for assisting the manipulation of a steering wheel, and an assist compensation amount calculation section calculating an assist compensation amount for correcting the basic assist amount. The system includes an assist amount correction section calculating a corrected assist amount by correcting the basic assist amount based on the assist compensation amount, and a motor drive section driving a motor using the corrected assist amount. The assist compensation amount calculation section uses a reverse input specification that more transmits the signal components of specific frequency in road-surface input torque, to a steering wheel than in the case of using only the basic assist amount, and calculates the assist compensation amount suitable for a vehicle-state value, such as a steering torque, to suppress variation in the transmission characteristics due to variation of the vehicle-state value.

An electrohydraulic steer-by-wire steering system has an operator interface for specifying a turning angle, which is associated with a sensor for the acquisition of a position or movement of the operator interface. An electronic control device is connected to a first electrohydraulic circuit and to a second electrohydraulic circuit and set up in order to actuate the two electrohydraulic circuits as a function of a signal from the sensor. The system further includes a steering actuator for adjusting the turning angle of a steerable wheel. The steering actuator has two chambers each of which is connected simultaneously to the two electrohydraulic circuits.

A mode setting unit of ECU controls a turning angle so as to be a turning angle in accordance with a steering angle detected by a steering angle sensor. When a vehicle is started, the mode setting unit controls an angle ratio so as to be an angle ratio that is equal to or smaller than a ratio of the turning angle to the steering angle (mechanical angle ratio) when a steering wheel and a turning mechanism are connected by a clutch mechanism.

According to the present embodiments, it is possible to provide a steer-by-wire type steering apparatus which: limits a steering wheel operation of a driver within a maximum rotation angle, thereby increasing steering feel for the driver; prevents a clock spring installed on a steering wheel from being damaged, and enables parts to be manufactured and processed more easily; enables simple assembly; has small interference with surrounding parts, and thus the apparatus can be designed in various structures; and is advantageous in terms of packaging.

In a steering system including a steering operation mechanism, a second actuator, a steering angle sensor, a steering torque sensor, and a steering operation control device and a control method for the steering system, only a drive assist target steered angle (first target steered angle) is reflected in a final target steered angle when a torque sensor value (actual steering torque) detected by the steering torque sensor is equal to or less than an intervention threshold. When the magnitude of the torque sensor value is more than the intervention threshold, the rate of reflection (distribution ratio) of a driver target steered angle (second target steered angle) in the final target steered angle is raised as the torque sensor value is increased, and the rate of reflection of the driver target steered angle in the final target steered angle is lowered as the magnitude of the torque sensor value is decreased.

The disclosure relates to a steering wheel actuator unit for a steer-by-wire steering apparatus for a motor vehicle and having a steering axle, wherein a free end of the steering axle is designed for arranging a steering wheel and the steering axle is rotatably mounted about its longitudinal axle, the steering wheel actuator unit comprising at least one feedback device which acts on the steering axle to realize a predetermined torque and/or a predetermined damping, and a spindle device connected to the steering axle for providing end stops for the rotational movement of the steering axle. In order to be able to reduce and/or avoid incorrect operation in case of failure of the feedback device, the steering wheel actuator unit further comprising an eddy current device which generates a resistance for the rotation of the steering axle about its longitudinal axle.

A steering column assembly for a motor vehicle, having an outer tube which is arranged in a rotationally fixed manner, a telescopic steering column which is received at least in part in the outer tube, and a rotary drive which is adapted to telescopically adjust the telescopic steering column, wherein the telescopic steering column comprises a first steering column portion and a second steering column portion which surrounds the first steering column portion at least in part. The two steering column portions are coupled with one another in a telescopic portion. in such a manner that they are telescopically displaceable relative to one another. The rotary drive is in engagement with the first steering column portion so that the rotary drive transfers a force to the first steering column portion in order to telescopically adjust the telescopic steering column.

A steer-by-wire steering system for a motor vehicle is presented, having a steering means to be held by the driver, a bearing device and an electric steering means actuator. The bearing device has a first sleeve element and a second sleeve element, which are connected to one another to be telescopic along an axial direction of the sleeve elements. The bearing device has a fastening element, which is fixedly connectable to a body of the motor vehicle, wherein the second sleeve element is fixedly mounted on the actuating element and wherein the steering means and the steering means actuator are mounted on the first sleeve element such that they are immovable in relation to the first sleeve element in the axial direction.