Electric brake device

An electric brake device comprising:

• a brake rotor;
• a friction member configured to be brought into contact with the brake rotor;
• a friction member operating actuator configured to bring the friction member into contact with the brake rotor;
• an electric motor configured to drive the friction member operating actuator;
• and a control device configured to control a braking force by means of the electric motor,
• the control device including:
• a braking force follow-up controller configured to control the braking force so as to follow up a target braking force provided from a higher-level control unit;
• a braking force maintaining controller configured to maintain a current of the electric motor or motor current at a constant value;
• and a switching controller configured to perform switching between control by the braking force follow-up controller and control by the braking force maintaining controller,
• the switching controller including:
• a constant target value determining function unit configured to determine whether or not a target value is constant, depending on whether or not an absolute value of a rate of change of the target braking force is equal to or less than a predetermined value;
• and a follow-up state determining function unit configured to determine whether or not the braking force is in a follow-up state to the target braking force, depending on whether or not a deviation between the braking force and the target braking force is within a predetermined range, wherein
• when a condition, which the constant target value determining function unit has determined that the target value is constant and the follow-up state determining function unit has determined that the braking force is in the follow-up state, is satisfied, switching is performed from the control by the braking force follow-up controller to the control by the braking force maintaining controller which maintains the motor current at a constant value, and
• the motor current maintained at the constant value by the braking force maintaining controller is a motor current that is determined on the basis of the braking force or the target braking force obtained when the switching controller has determined that the condition is satisfied.