An actuator control device includes: a turning control value calculation unit configured to calculate a turning control value that controls an actuator configured to turn a steered wheel on a basis of an operation state amount by a driver with respect to a steering mechanism of the vehicle; a target value setting unit configured to set a target value of a state amount indicating a traveling direction of the vehicle on a basis of a surrounding environment of the vehicle; a target value control unit configured to control the actuator by integral control so that actual the state amount approaches the target value; and an integral suppression unit configured to suppress an increase in a first integral value calculated in the integral control according to a second integral value calculated according to the operation state amount.

An actuator control device includes: a turning control value calculation unit configured to calculate a turning control value that controls an actuator configured to turn a steered wheel on a basis of an operation state amount by a driver with respect to a steering mechanism of the vehicle; a target value setting unit configured to set a target value of a state amount indicating a traveling direction of the vehicle on a basis of a surrounding environment of the vehicle; a target value control unit configured to control the actuator by integral control so that actual the state amount approaches the target value; and an integral suppression unit configured to suppress an increase in a first integral value calculated in the integral control according to a second integral value calculated according to the operation state amount.

A motor-driven power steering apparatus includes an auxiliary output generation unit configured to generate an auxiliary output of a motor by using at least one of a vehicle speed, a steering angle and a column torque; a compensation gain generation unit configured to generate a compensation gain for compensating for a steering pull of a vehicle by a rapid acceleration during a turn, by using at least one of the vehicle speed, the steering angle and the column torque; and an auxiliary output compensation unit configured to compensate for an auxiliary output by applying the compensation gain outputted by the compensation gain generation unit to the auxiliary output.

A motor-driven power steering apparatus includes an auxiliary output generation unit configured to generate an auxiliary output of a motor by using at least one of a vehicle speed, a steering angle and a column torque; a compensation gain generation unit configured to generate a compensation gain for compensating for a steering pull of a vehicle by a rapid acceleration during a turn, by using at least one of the vehicle speed, the steering angle and the column torque; and an auxiliary output compensation unit configured to compensate for an auxiliary output by applying the compensation gain outputted by the compensation gain generation unit to the auxiliary output.

For a vehicle having left and right powered front wheels and a rear axle having left and right casters, with at least one of the casters being steerable, the steering angle of the steerable caster is controlled when the vehicle is stationary and executing a direction orientation maneuver prior to transitioning to a turn. The rotations of the steerable caster and at least one of the left and right wheels may be autonomously adjusted using a controller. The controller rotates the steerable caster about a caster axis in a direction consistent with the direction of the turn through a steering angle proportion to the magnitude of the turn, and rotates at least one of the left and right wheels to turn the vehicle in a direction consistent with the direction of the turn and in proportion to the magnitude of the turn.

For a vehicle having left and right powered front wheels and a rear axle having left and right casters, with at least one of the casters being steerable, the steering angle of the steerable caster is controlled when the vehicle is stationary and executing a direction orientation maneuver prior to transitioning to a turn. The rotations of the steerable caster and at least one of the left and right wheels may be autonomously adjusted using a controller. The controller rotates the steerable caster about a caster axis in a direction consistent with the direction of the turn through a steering angle proportion to the magnitude of the turn, and rotates at least one of the left and right wheels to turn the vehicle in a direction consistent with the direction of the turn and in proportion to the magnitude of the turn.

A vehicle control system includes: an electric power steering device that generates an assist torque that assists turning of a wheel caused by a steering wheel rotation; a controller that controls the electric power steering device to generate the assist torque according to the steering wheel rotation in a normal mode; and a state sensor that detects a vehicle travel state and a state of an occupant at a driver's seat. When the occupant at the driver's seat performs a getting-on action or a getting-off action when the vehicle is in an ignition-ON state, the controller controls the electric power steering device in a temporal mode. In the temporal mode, the controller changes a method of controlling the electric power steering device such that the steering wheel rotation is suppressed as compared with a case of the normal mode.

A vehicle control system includes: an electric power steering device that generates an assist torque that assists turning of a wheel caused by a steering wheel rotation; a controller that controls the electric power steering device to generate the assist torque according to the steering wheel rotation in a normal mode; and a state sensor that detects a vehicle travel state and a state of an occupant at a driver's seat. When the occupant at the driver's seat performs a getting-on action or a getting-off action when the vehicle is in an ignition-ON state, the controller controls the electric power steering device in a temporal mode. In the temporal mode, the controller changes a method of controlling the electric power steering device such that the steering wheel rotation is suppressed as compared with a case of the normal mode.

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 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.