BRAKE FLUID PRESSURE CONTROL DEVICE FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To effectively reduce discordant noise generated when a wheel cylinder pressure is controlled using a linear solenoid valve in which an energization current is controlled by duty control. SOLUTION: The brake fluid pressure control device is constituted such that the linear solenoid valve in which the energization current is linearly controlled by duty control based on one cycle time Tcycle is adopted as a pressure increase valve between a master cylinder and a wheel cylinder, a solenoid opening/closing valve is adopted as a pressure reduction valve between a wheel cylinder and a reservoir and a wheel cylinder pressure is controlled in a pressure-increased, retained or pressure-reduced state. In the device, while aiming at that high frequency operation sound from the pressure increase valve becomes small as Tcycle is short and that the high frequency operation sound is not totally generated from the pressure increase valve when the pressure increase valve is maintained to the closed state (that is, at retention/pressure reduction control), Tcycle is set to a long time (time Thold) at retention/pressure reduction control and Tcycle is set to a short time (within a range of time T0 to time T1 (T0