Steering control device

A steering control device for controlling a drive of a reaction motor that applies reaction torque to a steering wheel in a steer-by-wire system in which a steering mechanism and a turning mechanism are mechanically separated, or for controlling a drive of a steering motor that functions as a steering assist motor that applies steering assist torque to a steering wheel in an electric power steering system in which a steering mechanism and a steering mechanism are mechanically coupled, comprising:

• a steering wheel lock calculating unit configured to perform a steering wheel lock drive control for calculating a drive command so as to output a lock torque for maintaining a rotation stop state of the steering wheel by energizing the steering motor when a predetermined condition is satisfied while a vehicle is parked or stopped;
• and
• a power converter configured to convert power supply electric power according to the drive command calculated by the steering wheel lock calculating unit and supplies the electric power to the steering motor, wherein
• the steering wheel lock calculating unit calculates the drive command so that a rotation angle of the steering motor follows a rotation angle command value,
• during the steering wheel lock drive control, when the steering wheel is rotated by a steering wheel torque exceeding a lock torque output by the steering motor,
• the steering wheel lock calculating unit returns the steering wheel to a steering wheel angle based on an initial value of the rotation angle command value to continue the steering wheel lock drive control.

A steering control device for controlling a drive of a reaction motor that applies reaction torque to a steering wheel in a steer-by-wire system in which a steering mechanism and a turning mechanism are mechanically separated, or for controlling a drive of a steering motor that functions as a steering assist motor that applies steering assist torque to a steering wheel in an electric power steering system in which a steering mechanism and a steering mechanism are mechanically coupled, comprising:

• a steering wheel lock calculating unit configured to perform a steering wheel lock drive control for calculating a drive command so as to output a lock torque for maintaining a rotation stop state of the steering wheel by energizing the steering motor when a predetermined condition is satisfied while a vehicle is parked or stopped;
• and
• a power converter configured to convert power supply electric power according to the drive command calculated by the steering wheel lock calculating unit and supplies the electric power to the steering motor, wherein
• the steering motor is a polyphase motor, and
• while the steering wheel lock drive control is being performed, the steering wheel lock calculating unit switches an energized phase according to an energized time so as to avoid concentration of energization on a specific phase of the steering motor.

A steering control device for controlling a drive of a reaction motor that applies reaction torque to a steering wheel in a steer-by-wire system in which a steering mechanism and a turning mechanism are mechanically separated, or for controlling a drive of a steering motor that functions as a steering assist motor that applies steering assist torque to a steering wheel in an electric power steering system in which a steering mechanism and a steering mechanism are mechanically coupled, comprising:

• a steering wheel lock calculating unit configured to perform a steering wheel lock drive control for calculating a drive command so as to output a lock torque for maintaining a rotation stop state of the steering wheel by energizing the steering motor when a predetermined condition is satisfied while a vehicle is parked or stopped;
• and
• a power converter configured to convert power supply electric power according to the drive command calculated by the steering wheel lock calculating unit and supplies the electric power to the steering motor, wherein
• after a start of the steering wheel lock drive control, when a sleep mode release trigger is received from the vehicle or when a predetermined time has passed without input of steering wheel torque,
• the steering wheel lock calculating unit stops the steering wheel lock drive control and shifts to a sleep mode.

A steering control device for controlling a drive of a reaction motor that applies reaction torque to a steering wheel in a steer-by-wire system in which a steering mechanism and a turning mechanism are mechanically separated, or for controlling a drive of a steering motor that functions as a steering assist motor that applies steering assist torque to a steering wheel in an electric power steering system in which a steering mechanism and a steering mechanism are mechanically coupled, comprising:

• a steering wheel lock calculating unit configured to perform a steering wheel lock drive control for calculating a drive command so as to output a lock torque for maintaining a rotation stop state of the steering wheel by energizing the steering motor when a predetermined condition is satisfied while a vehicle is parked or stopped;
• and
• a power converter configured to convert power supply electric power according to the drive command calculated by the steering wheel lock calculating unit and supplies the electric power to the steering motor, wherein
• when a steering wheel torque equal to or greater than a release threshold value is input during the steering wheel lock drive control,
• the steering wheel lock calculating unit stops the steering wheel lock drive control to release the lock.