The present embodiments may provide a steer by wire type steering apparatus including a screw shaft rotating in conjunction with the steering shaft, a moving member coupled to an outer circumferential side of the screw shaft and moving in the axial direction when the screw shaft rotates, a housing in which the screw shaft and the moving member are embedded, and a guide member coupled to the housing to support the moving member and guide the axial movement of the moving member.

A steering control device includes an electronic control unit. The electronic control unit controls operation of a steering-side motor so as to apply a steering reaction force that resists a steering operation input to the steering wheel. The electronic control unit computes an obstruction strike reaction force for regulating a steering operation that steers a steered wheel toward an obstruction. The electronic control unit generates determination information indicating that the steered wheel is struck by an obstruction. The determination information includes first determination information indicating that the left side of the steered wheel is struck by an obstruction, and second determination information indicating that the right side of the steered wheel is struck by an obstruction. The electronic control unit sets a direction in which the obstruction strike reaction force is applied based on the generated determination information.

A steering control device for use in a steer-by-wire system is provided. The steering control device controls a reaction force device and a turning device of a steer-by-wire system. The steering control device includes a steering wheel torque controller that calculates a basic reaction force torque command value being a basic value of a reaction force torque command value so that a detection value of the torque sensor follows a target value. The steering control device further includes an end controller that stops a control of the steering wheel torque controller when: an absolute value of angle of the reaction force device or the turning device is equal to or greater than a limit angle value; and a physical quantity corresponding to an output torque of the turning device and the detection value of the torque sensor are values corresponding to approach to the limit angle value.

A steering device includes a turning shaft, a turning motor, and a control device that controls the turning motor such that an angle capable of being converted into a turning angle of a turning wheel follows a target angle that is calculated depending on a steering state of a steering wheel. The control device executes a correction process of correcting the target angle. The control device corrects the target angle such that the degree of an increase in the target angle is slower as the target angle approaches a limit value of an angle region, when the target angle increases toward the limit value of the angle region in either of a vehicle stop state or an extremely low speed state.

A steering control device includes an electronic control unit configured to calculate a target reaction torque that is a target value of a steering reaction force that is a force against steering input to a steering unit and to control operation of a steering-side motor provided in the steering unit such that a motor torque corresponding to the target reaction torque is generated. The electronic control unit is configured to calculate an angle axial force, as an axial component based on an axial force acting on a turning shaft that operates to turn turning wheels, the angle axial force being an axial force in which road-surface information is not reflected, and the angle axial force being determined according to an angle convertible to a turning angle of the turning wheels. The electronic control unit is configured to perform a guard process such that the angle axial force is not excessive.

A steering control device controls a reaction motor that generates a steering reaction force applied to a steering wheel of which power transmission to and from turning wheels is cut off. the steering control device includes: a first processor configured to change a virtual operation range of the steering wheel according to a steering state or a vehicle state by controlling the reaction motor; and a second processor configured to change a degree of change of the virtual operation range of the steering wheel according to the steering state or the vehicle state when an operation position of the steering wheel reaches a position in a vicinity of a limit position of the virtual operation range.

A steering control device includes a control unit configured to control at least an operation of a steering-side motor. The control unit is configured to calculate a target reaction torque; calculate a difference axial force that is used to limit steering for turning the turning wheels in a predetermined direction, the difference axial force being reflected in the target reaction torque; and set a reference angle to one of a steering angle and a turning angle, set a converted angle to an angle obtained by converting another of the steering angle and the turning angle according to a steering angle ratio, and calculate the difference axial force based on a difference between the reference angle and the converted angle.

A rotation limiting device for a steering system includes a steering shaft rotatable during steering motion. The rotation limiting device also includes a stationary feature. The rotation limiting device further includes a first plate having a face defining a slot extending from a first end to a second end. The rotation limiting device yet further includes a second plate having a face defining a spiral shaped recess extending from a first spiral end to a second spiral end. The rotation limiting device also includes a ball bearing partially disposed within the spiral shaped recess and the slot, wherein one of the first plate and the second plate is fixed to the stationary feature, and the other of the first plate and the second plate is fixed to the steering shaft and rotatable therewith.

Steer-by-wire steering systems for vehicles and related methods are described herein. An example steer-by-wire steering system includes a steering wheel angle sensor to detect a current steering wheel angle (α) of a steering wheel of the motor vehicle, a steering actuator to generate a variable steering torque on a steerable wheel of the motor vehicle, a steering angle sensor to detect a current steering angle (β) of the steerable wheel, and a steer-by-wire controller to process signals from the steering wheel angle sensor and the steering angle sensor and control the steering actuator based on the signals. The steer-by-wire controller is configured to vary a transmission ratio between a change in the steering wheel angle (α) and a change in the steering angle (β).

Disclosed are a steering auxiliary motor control device and a method thereof, the device comprising: a receiving unit for receiving steering angle information and driver steering torque information from a sensor included in a vehicle; a maximum steering angle determination unit for determining the maximum steering angle of the vehicle on the basis of the steering angle information and preset reference steering angle information; and a limited motor torque determination unit for determining limited motor torque for limiting maximum motor torque outputted from a steering auxiliary motor on the basis of a first condition including the steering angle information, the maximum steering angle information, and steering angle holding time information and/or a second condition including the driver steering torque information, over-torque limit entry torque information, over-torque limit release torque information, and steering torque holding time information.