Brake control device for vehicles

Abstract

A brake control device comprises: a control cylinder that generates servo pressure through the movement of a control piston driven by an electric motor; a normally open solenoid valve provided in a fluid pressure transmission path from the control cylinder to a wheel cylinder; and a control unit that controls the electric motor and the solenoid valve, adjusting the wheel cylinder pressure by the servo pressure. When a temperature-related value, associated with the temperature of a component connected to the electric motor, exceeds a threshold, the control unit closes the solenoid valve to reduce the servo pressure to a lower limit pressure, determined based on a maximum nominal size that allows continuous application of pressure to the component.Furthermore, if the differential pressure between the wheel pressure and the lower limit pressure is low, the control device reduces the valve flow supplied to close the solenoid valve compared to the case where the differential pressure is high.