Patent ID: 7469974

Claim:
A vehicle brake control device, comprising: a brake operating member to be operated by a driver; an operation amount sensor for detecting an operation amount of the brake operating member; a cylinder including a first piston, a second piston, and a reservoir, the first and second pistons demarcating a first chamber and a second chamber, the reservoir storing brake fluid and being in communication with the first chamber and the second chamber, wherein the first and second pistons are pushed by a push rod connected with the brake operating member and accordingly compress the first and second chambers; first and second front wheel cylinders, which are respectively installed to two front wheels; first and second rear wheel cylinders, which are respectively installed to two rear wheels; a main conduit for connecting the first and second front wheel cylinders and the first and second rear wheel cylinders with the reservoir, the main conduit branching into four sections which are respectively be connected with the first and second front wheel cylinders and the first and second rear wheel cylinders; a first pump located in a first one of the four sections, the first pump for pressurizing the first front wheel cylinder by drawing in and discharging the brake fluid stored in the reservoir; a second pump located in a second one of the four sections, the second pump for pressurizing the first rear wheel cylinder by drawing in and discharging the brake fluid stored in the reservoir; a third pump located in a third one of the four sections, the third pump for pressurizing the second front wheel cylinder by drawing in and discharging the brake fluid stored in the reservoir; a fourth pump located in a fourth one of the four sections, the fourth pump for pressurizing the second rear wheel cylinder by drawing in and discharging the brake fluid stored in the reservoir; a first motor for driving the first and second pumps which pressurize a first conduit path in the main conduit; a second motor for driving the third and fourth pumps which pressurize a second conduit path in the main conduit; first to fourth adjustment conduits, which are located respectively in parallel with the four pumps; first to fourth linear valves, which are respectively located in the first to fourth adjustment conduits; a first auxiliary conduit for connecting the first chamber with the first front wheel cylinder via a point downstream of the first pump; a first control valve located in the first auxiliary conduit; a second auxiliary conduit for connecting the second chamber with the second front wheel cylinder via a point downstream of the third pump; a second control valve located in the second auxiliary conduit; and a control means for controlling the first to fourth linear valves, the first and second control valves, and the first and second motors, based on a detection signal from the operation amount sensor.