Patent ID: 8332113

Claim:
A brake control apparatus for a vehicle, comprising: four wheel braking apparatuses for applying a braking torque to front-right, front-left, rear-right, and rear-left wheels respectively in response to a braking hydraulic pressure supplied to each of wheel cylinders at respective wheels; a first hydraulic pressure generating apparatus including two hydraulic pressure generating chambers each generating a hydraulic pressure in response to a braking operation by a driver of a vehicle; a front-wheel hydraulic circuit hydraulically connecting one of the hydraulic pressure generating chambers to the two of the wheel braking apparatuses corresponding to the front-right wheel and the front-left wheel respectively; a rear-wheel hydraulic circuit hydraulically connecting the other one of the hydraulic pressure generating chambers to the other two of the wheel braking apparatuses corresponding to the rear-right wheel and the rear-left wheel respectively; a second hydraulic pressure generating apparatus being power driven and generating an auxiliary pressure that is added to the hydraulic pressure in each of the front-wheel hydraulic circuit and rear-wheel hydraulic circuit generated by the first hydraulic pressure generating apparatus; a detecting means for detecting a braking operation variable in response to the braking operation; a reference amount determining means for determining a reference amount of auxiliary hydraulic pressure of each of the front-wheels in the front-wheel hydraulic circuit and a reference amount of auxiliary hydraulic pressure of each of the rear-wheels in the rear-wheel hydraulic circuit on the basis of the detected braking operation variable; an obtaining means for obtaining at least one of a state quantity indicating a load condition of the vehicle, a state quantity indicating a driving condition of the vehicle and a state quantity indicating slipperiness of wheel; a target amount determining means for determining, on the basis of the determined amounts of front-wheel and the rear-wheel reference amount of auxiliary hydraulic pressures and the obtained state quantity, a target amount of auxiliary hydraulic pressure of each of the front-wheels in the front-wheel hydraulic circuit to be equal to or greater than the reference amount of auxiliary hydraulic pressure of each of the front-wheel and a target amount of auxiliary hydraulic pressure of each of the rear-wheels in the rear-wheel hydraulic circuit to be equal to or lower than the reference amount of auxiliary hydraulic pressure of each of the rear-wheels; and a pressure regulating means for regulating the auxiliary hydraulic pressure in each of the front-wheel hydraulic circuit and the rear-wheel hydraulic circuit so as to correspond to respective target amount of auxiliary hydraulic pressures of the front-wheel and the rear-wheel.