Electric brake device

摘要

There is provided a brake system for vehicles, the brake system including: a slave cylinder S/C to generate a hydraulic pressure by an electric motor according to a braking operation by a driver; and a controller to decrease an operation amount of the slave cylinder S/C when an operation amount of the electric motor is maintained, then increase an operation amount of the slave cylinder S/C when a change occurs in an operation amount of the electric motor subsequently. The controller determines whether or not the phase currents Iu, Iv, Iw of the electric motor are in two-phase continuously energized state and the state remains for a certain time or longer. When the determination conditions are satisfied, the controller performs commutation control to generate commutation in the electric motor by reducing a target hydraulic pressure of the slave cylinder S/C.

主权项

1. An electric brake apparatus, comprising:
an electric hydraulic pressure generating device configured to generate a hydraulic pressure by a three-phase electric motor according to a braking operation by a driver; and a controller configured to, when it is determined that the electric motor is in two-phase continuously energized state in which a current continuously flows through same two phases out of three phases of currents driving the electric motor, decrease an operation amount of the electric hydraulic pressure generating device, wherein the two-phase continuously energized state is a state in which a certain time has elapsed while the electric hydraulic pressure generating device is generating the hydraulic pressure even though the electric motor is not rotating, wherein the electric hydraulic pressure generating device includes a cylinder and a piston, and wherein when it is determined that the electric motor is in the two-phase continuously energized state, the controller determines whether an operation amount of the piston in the cylinder is at maximum level, and if not, the controller does not decrease the operation amount of the electric hydraulic pressure generating device until the operation amount of the piston in the cylinder reaches the maximum level.