A vehicle is provided including an electronic power steering system, an electronic throttle control system, and a stability control system.

A vehicle is provided including an electronic power steering system, an electronic throttle control system, and a stability control system.

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 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 device includes: a turning shaft that turns a turning wheel of a vehicle, with dynamic power transmission being separated between the turning shaft and a steering wheel; a turning motor; and a control device. The control device executes a particular process for increasing a command value to a value larger than an original command value that depends on a steering state, in a particular situation where an axial force exceeding a design-based expectation is easily generated in the turning shaft.

A steering control device is configured to control a steering device as a controlled object, the steering device having a structure in which transmission of power between a steering portion and a turning portion is cut off. The steering control device includes a central processing unit. The central processing unit is configured to execute a reduction process in a case where at least either one of a travel state amount and a steering state amount is a state amount indicating that a target turning-corresponding angle does not change. The reduction process is a process of reducing a driving current to be supplied to a turning motor.

A steering control device controls a turning motor that generates a turning force for causing turning wheels of which power transmission to and from a steering wheel is cut off to turn. The steering control device includes a first processor configured to change a steering angle ratio which is a ratio of a turning angle of the turning wheels to a steering angle of the steering wheel according to a vehicle speed through control of the turning motor and a second processor configured to change a degree of change of the steering angle ratio with respect to change of the vehicle speed according to a steering state or a vehicle state.

A steering control device controls a turning motor that generates a turning force for causing turning wheels of which power transmission to and from a steering wheel is cut off to turn. The steering control device includes a first processor configured to change a steering angle ratio which is a ratio of a turning angle of the turning wheels to a steering angle of the steering wheel according to a vehicle speed through control of the turning motor and a second processor configured to change a degree of change of the steering angle ratio with respect to change of the vehicle speed according to a steering state or a vehicle state.

A steering control device includes a target torque generating unit configured to generate a target torque which is a target value of a motor torque. The target torque generating unit includes an axial component calculating unit. The axial component calculating unit includes a first calculation system configured to calculate a vehicle-speed-based axial force, a second calculation system configured to calculate an other-state-quantity-based axial force, and an output switching unit. The output switching unit is configured to output the vehicle-speed-based axial force as the axial component by validating the first calculation system when a state of the vehicle speed is normal and to output the other-state-quantity-based axial force as the axial component by validating the second calculation system when the state of the vehicle speed is abnormal.