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 drive-by-wire steering system for a power equipment device is provided. One example embodiment comprises a steering interface system, a power steering system, and a communication link connecting the steering interface system and power steering system. The power steering system can adjust steering angle of wheels of the power equipment device based on inputs received from the steering interface system. The steering interface system can receive user inputs and provide powered feedback and/or a simulated caster effect via a steering interface. Additional embodiments include power equipment devices and steering interface systems.

A steering device includes: an offset correction value storing section to store an offset correction value including a first offset correction value and a second offset correction value, the first offset value being a current value for correcting the first sensed current signal so that a value of a vibration of the electric motor is equal to or smaller than a first predetermined value when the motor rotation speed signal is a first rotation speed, and the second offset value being a current value for correcting the first sensed current signal so that the value of the vibration of the electric motor is equal to or smaller than a second predetermined value when the motor rotation speed signal is a second rotation speed.

A steering device, including: a steering knuckle rotatably holding a wheel; an electric motor and a speed reducer configured to decelerate rotation of the electric motor, the electric motor and the speed reducer being fixed to a suspension arm; and a joint through which the steering knuckle is supported by the suspension arm in a state in which a kingpin axis is allowed to incline with respect to the suspension arm, the joint coupling the steering knuckle and an output shaft of the speed reducer such that the steering knuckle pivots about the kingpin axis by an operation of the electric motor.

A motor control device includes an inverter to drive a motor, and a control calculator to calculate a current command value indicating a current to be supplied to the motor from the inverter. The control calculator includes a voltage control calculator to calculate a voltage command value indicating a voltage to be applied to the motor from the inverter based on a current deviation between the current command value and the actual current detection value, and a compensation calculator to add a compensation value to a signal value on at least one of an upstream side and a downstream side in a signal flow that passes through the voltage control calculator. The voltage control calculator calculates the voltage command value by adaptive control based on an actual angular velocity value indicating an angular velocity at which the motor rotates. The compensation calculator calculates the compensation value based on the actual angular velocity value and the target current command value.

A steer-by-wire vehicle includes a steering actuator configured to turn a wheel and a reaction actuator configure to apply a torque to a steering wheel. An electronic control unit of a control apparatus for the vehicle is configured to execute normal steering control for turning the wheel and applying a reaction torque to the steering wheel according to a rotation of the steering wheel, and, when an activation condition including that the normal steering control is not needed is satisfied, execute rotation suppression control for suppressing the rotation of the steeling wheel without prohibiting the rotation of the steering wheel. Specifically, the electronic control unit is configured to, based on a steering speed or a steering torque, determine a rotation suppression torque for suppressing the rotation of the steering wheel, and control the reaction actuator such that the rotation suppression torque is applied to the steering wheel.

In a steer-by-wire steering apparatus according to embodiments of the present invention, a structure for preventing rotation of a sliding bar in order to allow the sliding bar to slide in the axial direction by the torque of a motor or a structure for determining a position to which the sliding bar moves can be more simply implemented, whereby the number of components can be reduced, the assembly process can be simplified, and the cost can be significantly reduced.

Provided is a control device (14) for a power steering device including a steering mechanism (1) configured to transmit rotation of a steering wheel to a steered wheel, and an electric motor (13) configured to apply a steering force to the steering mechanism. The control device includes: a command signal calculation part (61) configured to calculate a motor command signal (Io) for control of driving of the electric motor, based on a state of steering of the steering wheel, and output the command signal to the electric motor; a vibration signal receiving part (69) configured to receive a vibration signal of the power steering device; and an abnormality determination part (63) configured to determine whether or not the power steering device is abnormal, based on a Y-axis acceleration signal (Gy) received by the vibration signal reception part.

An aspect of a drive controller controls drive of a three-phase motor, and includes an imbalance calculation unit that calculates an electrical imbalance between phases in the three-phase motor, a control value calculation unit that calculates current control values in respective axial directions of a rotating coordinate system of the three-phase motor according to a given target, and a balance compensation unit that reduces the imbalance by adding a compensation value to a current control value in an axial direction other than a q-axis of the current control values calculated by the control value calculation unit.

An electric motor with a rotor and a stator, where the rotor and/or the stator can comprise two or more sections, and a torque ripple caused by the magnetic field(s) associated with a section of the rotor (or stator) can at least partially counters torque ripple caused by the magnetic field(s) associated with other section(s) of the rotor (or stator).