An electric power steering device is provided, easing a sense of incongruity that a driver feels with respect to steering. If an abnormal phase is detected, an electronic control unit (ECU) 50 stops energizing a winding (any one of windings 86u, 86v and 86w) of the abnormal phase and energizes windings (two of the windings 86u, 86v and 86w) of the two phases other than the abnormal phase, and, as a vehicle speed V increases, the ECU 50 reduces a current value applied to the windings (two of the windings 86u, 86v and 86w) of the two phases other than the abnormal phase.

Cost is reduced when a duplication configuration including up to a power supply is adopted. An in-vehicle electronic control device that executes calculation processing of vehicle control using information acquired by an external sensor includes: a first calculation unit that executes the calculation processing; and a second calculation unit that is communicably connected to the first calculation unit, in which the first calculation unit and the second calculation unit are supplied with power from different power supplies, and execute calculation processing of vehicle control that is different from each other in a normal state, the first calculation unit outputs an action plan of a vehicle, the second calculation unit outputs a signal to be input to an actuator for operating a vehicle, and when the first calculation unit or the second calculation unit fails, a calculation unit in a normal state executes calculation processing of degenerated vehicle control.

A steer-by-wire rudder system includes a first system having a first motor unit that drives a rudder mechanism and a first control unit that controls the first motor unit, and a second system having a second motor unit that drives the rudder mechanism and a second control unit that controls the second motor unit. The first control unit and the second control unit perform cooperative control for controlling the first motor unit and the second control unit to cooperate with each other. When the cooperative control is not performed, one of the control of the first motor unit by the first control unit and the control of the second motor unit by the second control unit continues, and the other thereof stops.

A steer-by-wire rudder system includes a first system having a first motor unit that drives a rudder mechanism and a first control unit that controls the first motor unit, and a second system having a second motor unit that drives the rudder mechanism and a second control unit that controls the second motor unit. The first control unit and the second control unit perform cooperative control for controlling the first motor unit and the second control unit to cooperate with each other. When the cooperative control is not performed, one of the control of the first motor unit by the first control unit and the control of the second motor unit by the second control unit continues, and the other thereof stops.

The embodiments relate to a steering control device and method of a vehicle. A steering control device may include a receiver configured to receive absolute steering angle information, relative steering angle information, and rack position information of the vehicle, a determiner configured to determine absolute steering angle estimation information based on the rack position information and the relative steering angle information if there is an abnormality in the absolute steering angle information, and a controller configured to, if an adjustment condition is satisfied for at least one of a rack limit position and a steering wheel limit position, perform a position adjustment control based on the rack position information and the absolute steering angle estimation information.

A control device includes a reaction force controller to generate an input torque input to a control target and control a reaction force transmitted to a steering person and an assist controller to generate a correction torque to correct the input torque based on an output of the control target and a nominal model. The assist controller includes a high-pass filter with a first cutoff frequency, a low-pass filter with a second cutoff frequency higher than the first cutoff frequency, and a disturbance compensation value calculator. When a transfer function of the low-pass filter is Q(s) and a transfer function of the high-pass filter is HPF(s), a transfer function of a control target is constrained by a transfer function of the nominal model in a frequency band in which a gain in a gain characteristic of Q(s).Math.HPF(s) is 1.

A control device that controls a control target including at least a motor in a steering mechanism including an input shaft to which a steering wheel is connected, an output shaft connected to the input shaft via a torsion bar, and the motor connected to the output shaft. The control device includes a reaction force controller to generate an input torque input to the control target based on a torsion bar torque generated in the torsion bar and to control a reaction force transmitted from the steering wheel to the steering person, and an assist controller to generate a correction torque to correct the input torque based on an output of the control target and a nominal model. The assist controller is configured or programmed such that a transfer function of the control target is constrained by a transfer function of the nominal model in a frequency band.

A control device includes a reaction force controller to generate an input torque input to the control target and control a reaction force transmitted from a steering wheel to a steering person, an assist controller to generate a correction torque to correct the input torque based on an output of the control target and a nominal model, and a state feedback circuit to feed back a state compensation value to the input torque based on the output of the control target. The assist controller is configured or programmed such that the transfer function of the control target is constrained by the transfer function of the nominal model in the frequency band where the gain in the gain characteristic of the complementary sensitivity function with respect to the modeling error between the control target and the nominal model is approximately 1.

The embodiments relate to a steering control device and method. Specifically, a steering control device according to an embodiment may include a first steering control module configured to receive steering information, determine a target rack position based on the steering information, and generate a first command current to control a steering motor so that a rack moves to the target rack position, and a second steering control module configured to receive a control right for the steering motor if the first steering control module fails, and generate a second command current for controlling the steering motor.

An electric rotating machine has a first end frame and a second end frame for firmly supporting a stator between them in an axial direction of the electric rotating machine. An electronic control portion is mounted to a rear side of the first end frame. Multiple through-holes are formed at a radial-outer periphery of the second end frame. Each of multiple through-bolts is inserted into the respective through-holes from a side of the second end frame and screwed into the first end frame, to thereby firmly connect the first and the second end frames to each other.