There is provided a torque transmission joint configured to transmit torque between end portions of a driving shaft and a driven shaft arranged in series in an axial direction. An outer-diameter-side concave-convex portion is formed on an inner periphery of one shaft of the driving shaft and the driven shaft or a member fixed to the one shaft, an inner-diameter-side concave-convex portion is formed on an outer periphery of the other shaft or a member fixed to the other shaft, and the outer-diameter-side concave-convex portion and the inner-diameter-side concave-convex portion are engaged with a circumferential gap being interposed therebetween. An elastic member is provided between the end portion of the driving shaft and the end portion of the driven shaft either directly or via another member such that torque can be transmitted between the driving shaft and the driven shaft.

There is provided a torque transmission joint configured to transmit torque between end portions of a driving shaft and a driven shaft arranged in series in an axial direction. An outer-diameter-side concave-convex portion is formed on an inner periphery of one shaft of the driving shaft and the driven shaft or a member fixed to the one shaft, an inner-diameter-side concave-convex portion is formed on an outer periphery of the other shaft or a member fixed to the other shaft, and the outer-diameter-side concave-convex portion and the inner-diameter-side concave-convex portion are engaged with a circumferential gap being interposed therebetween. An elastic member is provided between the end portion of the driving shaft and the end portion of the driven shaft either directly or via another member such that torque can be transmitted between the driving shaft and the driven shaft.

A variable steering angle steering device rotationally drives a rotational element using a steering angle ratio adjustment motor so as to change the relationship between the amount of rotation of a first rotating shaft and the amount of rotation of a second rotating shaft, thereby changing the relationship between the amount of steering of the steering wheel and the amount of change in steering angle. The steering angle ratio adjustment motor is supported and fixed at a part of a steering column forward than a portion at which the steering column is supported with respect to a support frame. In the event of primary collision, the steering angle ratio adjustment motor collides with the support frame and is thereby prevented from being displaced rearward beyond the support frame.

A variable steering angle steering device rotationally drives a rotational element using a steering angle ratio adjustment motor so as to change the relationship between the amount of rotation of a first rotating shaft and the amount of rotation of a second rotating shaft, thereby changing the relationship between the amount of steering of the steering wheel and the amount of change in steering angle. The steering angle ratio adjustment motor is supported and fixed at a part of a steering column forward than a portion at which the steering column is supported with respect to a support frame. In the event of primary collision, the steering angle ratio adjustment motor collides with the support frame and is thereby prevented from being displaced rearward beyond the support frame.

[Problem] An object of the present invention is to provide an electric power steering apparatus capable of smoothly switching the control systems without self-steer by gradually changing a control torque of the torque control and a command value of the position/speed control upon fade processing that switches the control systems.

[Means for Solving the Problem] The present invention is the electric power steering apparatus including a torque sensor to detect a steering torque and a motor control unit to control a motor that applies an assist torque to a steering system of a vehicle, comprising: a function to switch a control system of the motor between a torque control system of a torque system to control a motor output torque and a position/speed control system of a steering angle system to control a steering angle of a steering in accordance with a predetermined switching trigger, wherein each of a steering angle command value and a steering angle speed of the position/speed control system and an assist torque level of the torque control system gradually change sensitive to the steering torque, when shifting from the torque control system to the position/speed control system or vice versa.

An electric power steering apparatus includes a control section that includes a feed-back control section which sets a viscoelastic model as a reference model within a predetermined angle at front of a rack end. The feed-back control section includes a feed-back element to calculate a target rack displacement based on an input-side rack axial force and a control element to output an output-side rack axial force based on a position deviation between the target rack displacement and a rack displacement.

A steering input system for a trailer backup assist system includes an input apparatus having a housing and a user-manipulable input element coupled with the housing. The system further includes a controller determining a state of a use condition of the input apparatus and, based on the state of the use condition, one of implementing or disabling a trailer backup assist mode. The trailer backup assist mode generates a vehicle steering command based on an instantaneous position of the input element.

An apparatus for monitoring a signal path is provided. The signal path includes a first processing unit, which generates a first signal based on an input signal of the signal path, and a second processing unit, which generates an output signal of the signal path, wherein the output signal depends on the first signal. The apparatus includes an output estimation module configured to determine an estimated output signal of the second processing unit based on the input signal. Further, the apparatus includes a comparison module configured to determine a state of the signal path based on a deviation of the output signal from the estimated output signal.

A steering assist system for a vehicle comprises a steering assist module configured to determine a baseline assistance force to be applied to a steering system of the vehicle, and a transient disturbance compensation module configured to determine a transient compensation force to compensate for transient conditions that urge the vehicle to deviate from a straight path. The transient compensation force is based at least partially on the determined baseline assistance force. The system also includes a steady-state disturbance compensation module configured to determine a steady-state compensation force to compensate for steady-state conditions that urge the vehicle to deviate from the straight path, the steady-state compensation force being based at least partially on the determined baseline assistance force. Methods relate to controlling steering systems.

A method of reconstructing a detected faulty signal. A roll sensor fault is detected by a processor. A signal of the detected faulty roll sensor is reconstructed using indirect sensor data. The reconstructed signal is output to a controller to maintain stability.