Patent ID: 6039411
Filing Date: 2000-03-21
Classification: B60T

Abstract:
A brake control system for a vehicle comprising:wheel brake cylinders operatively mounted on front and rear wheels of said vehicle, said wheel brake cylinders being divided into two sets of wheel brake cylinders, each having two wheel brake cylinders;a master cylinder for pressurizing brake fluid in a reservoir to supply pressurized brake fluid to said wheel brake cylinders in response to depression of a brake pedal;a first hydraulic braking pressure circuit and a second hydraulic braking pressure circuit for communicating said master cylinder with each of said two sets of wheel brake cylinders, respectively;two sets of modulator means disposed in said first and second hydraulic braking pressure circuits, respectively, each of said modulating means modulating the braking pressure in each of said wheel brake cylinders;a pair of hydraulic pressure pumps disposed in said first and second hydraulic braking pressure circuits, respectively, each of said pumps introducing from an inlet thereof the brake fluid and pressurizing the brake fluid to supply the pressurized brake fluid to each of said wheel brake cylinders through each of said modulator means;two sets of first valve means disposed in said first and second hydraulic braking pressure circuits, respectively, each of said first valve means opening or closing a first passage for communicating said master cylinder with said modulator means, and said first valve means normally opening said first passage;two sets of second valve means disposed in said first and second hydraulic braking pressure circuits, respectively, each of said second valve means opening or closing a second passage for communicating said reservoir directly with the inlet of each of said pumps, or communicating said reservoir with the inlet of each of said pumps through said master cylinder, and each of said second valve means normally closing said second passage;auxiliary pressurization means for supplying pressurized brake fluid to each of said first and second hydraulic braking pressure circuits including said second valve means at the inlets of said pumps, respectively, to perform an auxiliary pressurization, at least when said second valve means opened said second passage; andcontrol means for actuating said modulator means, in the case where at least said second valve means in said first hydraulic braking pressure circuit opens said second passage, and said auxiliary pressurization means performs the auxiliary pressurization, to block the communication between said wheel brake cylinders in said second hydraulic braking pressure circuit, when said brake pedal is not depressed, and to communicate said wheel brake cylinders in said second hydraulic braking pressure circuit with said master cylinder, when said brake pedal is depressed.