Abstract: A vehicle braking system includes a master cylinder coupled to a brake pedal and establishing fluid communication to wheel cylinder(s) of primary and secondary circuits via respective outputs. A pressure sensor detects actual, non-boosted demand pressure. Each circuit includes a motor-driven pump defining pressure and suction sides, inlet and outlet valves, a normally-open isolation valve, and a normally-closed apply pressure control valve. A pedal feel simulator receives hydraulic fluid from the master cylinder when the isolation valves are closed. A controller receives a signal from the pressure sensor and generates corresponding control signals for the motor-driven pump and the apply pressure control valve of each circuit to pressurize the pressure side of each circuit equal to the sensed demand pressure plus a predetermined boost factor, and the actual pressure at each wheel cylinder is configured for individual manipulation by selective opening and closing of the inlet and outlet valves.

Abstract: A vehicle braking system includes a master cylinder coupled to a brake pedal and establishing fluid communication to wheel cylinder(s) of primary and secondary circuits via respective outputs. A pressure sensor detects actual, non-boosted demand pressure. Each circuit includes a motor-driven pump defining pressure and suction sides, inlet and outlet valves, a normally-closed isolation valve, and a normally-closed apply pressure control valve. A pedal feel simulator receives hydraulic fluid from the master cylinder when the isolation valves are closed. A controller receives a signal from the pressure sensor and generates corresponding control signals for the motor-driven pump and the apply pressure control valve of each circuit to pressurize the pressure side of each circuit equal to the sensed demand pressure plus a predetermined boost factor, and the actual pressure at each wheel cylinder is configured for individual manipulation by selective opening and closing of the inlet and outlet valves.