Electric braking device for vehicle

An electric braking device for a vehicle comprising:

• an electric motor generating power;
• a pressing member pressing a friction member against a rotating member integrally rotating together with a wheel of the vehicle;
• a power transmitting mechanism configured to transmit the power generated by the electric motor to the pressing member and cause pressing force to be generated by the pressing member with respect to the friction member;
• and
• a controller controlling a power supply amount for the electric motor such that, of pressing force determined on the basis of an operation of a brake operation member of the vehicle by a driver, pressing force determined on the basis of a parking brake function, and pressing force determined by an automatic pressurization control generating braking force regardless of the operation of the brake operation member, selected pressing force serving as pressing force selected on the basis of conditions of the vehicle is generated, wherein
• the controller is configured to
• determine whether a keeping state in which the pressing force is kept constant is set,
• detect hysteresis characteristics in a relationship between the power supply amount and the pressing force each time a predetermined time point comes, and
• when it is determined that the keeping state is set, on the basis of the detected hysteresis characteristics, acquire a minimum value of the power supply amount at which the current pressing force can be kept, and set the power supply amount for the electric motor to a value determined on the basis of the acquired minimum value of the power supply amount.

An electric braking device for a vehicle comprising:

• an electric motor generating power;
• a pressing member pressing a friction member against a rotating member integrally rotated together with a wheel of the vehicle;
• a power transmitting mechanism configured to transmit the power generated by the electric motor to the pressing member and cause pressing force to be generated by the pressing member with respect to the friction member;
• and
• a controller controlling a power supply amount for the electric motor such that the pressing force depending on an operation of a brake operation member of the vehicle by a driver is generated, wherein
• the controller is configured to
• determine whether a keeping state in which the pressing force is kept constant is set, and
• when it is determined that the keeping state is set, set the power supply amount for the electric motor to a value determined on the basis of a predetermined relationship being free from a hysteresis between the power supply amount and the pressing force obtained on the basis of specifications of the electric motor and the power transmitting mechanism.