Electric-brake controller and vehicle brake system

An electric-brake controller comprising an antilock controller configured to reduce slipping of a wheel under braking by controlling a pressing force of an electric brake comprising a pressing member that is advanced by rotation of an electric motor in a forward direction to press a friction member against a brake rotation member to reduce rotation of the wheel, the brake rotation member being configured to be rotated with the wheel, the pressing force being a force with which the pressing member presses the friction member against the brake rotation member,

• wherein the electric brake comprises a return spring configured to apply a spring force such that the pressing member is moved away from the brake rotation member in a back direction,
• wherein the antilock controller comprises a pressing-force reducer configured to reduce the pressing force,
• wherein the pressing-force reducer comprises:
• a reverse-rotation-current supplier configured to supply reverse-rotation current for a reverse-rotation-current supply time, the reverse-rotation current being current causing the electric motor to rotate in a reverse direction reverse to the forward direction;
• and
• a forward-rotation-current supplier configured to supply forward-rotation current to the electric motor after the reverse-rotation current is supplied by the reverse-rotation-current supplier for the reverse-rotation-current supply time, the forward-rotation current being current causing the electric motor to rotate in the forward direction, and
• wherein the antilock controller configured to:
• determine the reverse-rotation-current supply time, each time when the predetermined set time has elapsed;
• and
• execute feedforward control for reducing the pressing force for the reverse-rotation-current supply time.

A vehicle brake system, comprising:

• an electric brake comprising a pressing member that is advanced by rotation of an electric motor in a forward direction to press a friction member against a brake rotation member to reduce rotation of a wheel, the brake rotation member being configured to be rotated with the wheel;
• and
• an electric-brake controller comprising an antilock controller configured to reduce slipping of the wheel under braking by controlling a pressing force with which the pressing member presses the friction member against the brake rotation member,
• wherein the electric brake comprises a return spring configured to apply a spring force such that the pressing member is moved away from the brake rotation member in a back direction,
• wherein the antilock controller comprises a pressing-force reducer configured to reduce the pressing force,
• wherein the pressing-force reducer comprises:
• a reverse-rotation-current supplier configured to supply reverse-rotation current for a reverse-rotation-current supply time, the reverse-rotation current being current causing the electric motor to rotate in a reverse direction reverse to the forward direction;
• and
• a forward-rotation-current supplier configured to supply forward-rotation current to the electric motor after the reverse-rotation current is supplied by the reverse-rotation-current supplier for the reverse-rotation-current supply time, the forward-rotation current being current causing the electric motor to rotate in the forward direction,
• wherein the electric-brake controller comprises an operation-dependent pressing-force controller configured to control the pressing force to a magnitude related to a state of operation of a brake operating member by a driver, and
• wherein the pressing-force reducer is configured to reduce the pressing force at a rate greater than a maximum value of a rate at which the pressing force is reduced by the operation-dependent pressing-force controller.

A vehicle brake system, comprising:

• an electric brake comprising a pressing member that is advanced by rotation of an electric motor in a forward direction to press a friction member against a brake rotation member to reduce rotation of a wheel, the brake rotation member being configured to be rotated with the wheel;
• and
• an electric-brake controller comprising an antilock controller configured to reduce slipping of the wheel under braking by controlling a pressing force with which the pressing member presses the friction member against the brake rotation member,
• wherein the electric brake comprises a return spring configured to apply a spring force such that the pressing member is moved away from the brake rotation member in a back direction,
• wherein the antilock controller comprises a pressing-force reducer configured to reduce the pressing force,
• wherein the pressing-force reducer comprises:
• a reverse-rotation-current supplier configured to supply reverse-rotation current for a reverse-rotation-current supply time, the reverse-rotation current being current causing the electric motor to rotate in a reverse direction reverse to the forward direction;
• and
• a forward-rotation-current supplier configured to supply forward-rotation current to the electric motor after the reverse-rotation current is supplied by the reverse-rotation-current supplier for the reverse-rotation-current supply time, the forward-rotation current being current causing the electric motor to rotate in the forward direction, and
• wherein the antilock controller configured to:
• determine the reverse-rotation-current supply time, each time when the predetermined set time has elapsed;
• and
• execute feedforward control for reducing the pressing force for the reverse-rotation-current supply time.