Hydraulic brake boost

A brake system for actuating a pair of front wheel brakes and a pair of rear wheel brakes, the system comprising:

• a reservoir;
• a master cylinder operable during a manual push-through mode by actuation of a brake pedal connected to the master cylinder to generate brake actuating pressure at a first output for hydraulically actuating the pair of front wheel brakes;
• a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating the pair of front wheel brakes and the pair of rear wheel brakes during a normal non-failure braking event;
• an electronic control unit for controlling the power transmission unit;
• a pedal simulator in selective fluid communication with the master cylinder for providing predetermined brake pedal response;
• first and second two-position three-way valves, each three-way valve being hydraulically connected with the master cylinder, the power transmission unit, and a selected one of the front wheel brakes, and each of the first and second three-way valves selectively controlling hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to the selected one of the pair of front wheel brakes;
• and
• a hydraulic block, the hydraulic block including
• a master cylinder bore extending into the hydraulic block from a first block side and configured to selectively accept at least a portion of the master cylinder,
• a power transmission unit bore extending into the hydraulic block from a second block side, substantially perpendicular to the first block side, and being configured to selectively accept at least a portion of the power transmission unit, the power transmission unit bore protruding from a main body of the hydraulic block at a third block side, the third block side being substantially perpendicular to the first block side and substantially parallel to the second block side, the third block side including a power transmission unit housing cover selectively attached thereto for defining at least a portion of a hydraulic chamber of the power transmission unit, and
• a plurality of valve ports extending into the hydraulic block from the second block side, at least a selected two of the valve ports being each configured to selectively accept at least a portion of a selected one of the first and second two-position three-way valves, the selected two of the valve ports being located further from the first block side than is the power transmission unit bore;
• wherein the power transmission unit bore extends into the hydraulic block substantially perpendicular to, and spaced apart from, the master cylinder bore.

A brake system for actuating a pair of front wheel brakes and a pair of rear wheel brakes, the system comprising:

• a reservoir;
• a master cylinder operable during a manual push-through mode by actuation of a brake pedal connected to the master cylinder to generate brake actuating pressure at a first output for hydraulically actuating the pair of front wheel brakes;
• a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating the pair of front wheel brakes and the pair of rear wheel brakes during a normal non-failure braking event;
• an electronic control unit for controlling the power transmission unit;
• a pedal simulator in selective fluid communication with the master cylinder for providing predetermined brake pedal response;
• and
• first and second two-position three-way valves, each three-way valve being hydraulically connected with the master cylinder, the power transmission unit, and a selected one of the front wheel brakes;
• each of the first and second three-way valves selectively controlling hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to the selected one of the pair of front wheel brakes;
• the electronic control module being a first electronic control module, the brake system including a second electronic control module, wherein a chosen one of the first and second electronic control modules controls the power transmission unit, and the other one of the first and second electronic control modules controls the first and second three-way valves.

A brake system for actuating a pair of front wheel brakes and a pair of rear wheel brakes, the system comprising:

• a reservoir;
• a master cylinder operable during a manual push-through mode by actuation of a brake pedal connected to the master cylinder to generate brake actuating pressure at a first output for hydraulically actuating the pair of front wheel brakes;
• a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating the pair of front wheel brakes and the pair of rear wheel brakes during a normal non-failure braking event;
• an electronic control unit for controlling the power transmission unit;
• a pedal simulator in selective fluid communication with the master cylinder for providing predetermined brake pedal response;
• first and second two-position three-way valves, each three-way valve being hydraulically connected with the master cylinder, the power transmission unit, and a selected one of the front wheel brakes;
• each of the first and second three-way valves selectively controlling hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to the selected one of the pair of front wheel brakes;
• a pedal simulator valve interposed fluidically between the pedal simulator and the reservoir;
• and
• a pressure switch interposed fluidically between the pedal simulator and the reservoir, the pressure switch selectively providing a switch signal to the electronic control unit, the switch signal being indicative of an operational condition of the pedal simulator valve.

A brake system for actuating a pair of front wheel brakes and a pair of rear wheel brakes, the system comprising:

• a reservoir;
• a master cylinder operable during a manual push-through mode by actuation of a brake pedal connected to the master cylinder to generate brake actuating pressure at a first output for hydraulically actuating the pair of front wheel brakes;
• a power transmission unit configured for selectively providing pressurized hydraulic fluid for actuating the pair of front wheel brakes and the pair of rear wheel brakes during a normal non-failure braking event;
• an electronic control unit for controlling the power transmission unit;
• a pedal simulator in selective fluid communication with the master cylinder for providing predetermined brake pedal response;
• first and second two-position three-way valves, each three-way valve being hydraulically connected with the master cylinder, the power transmission unit, and a selected one of the front wheel brakes;
• each of the first and second three-way valves selectively controlling hydraulic fluid flow from a chosen one of the master cylinder and the power transmission unit to the selected one of the pair of front wheel brakes;
• and
• a pressure sensor located fluidically between the three-way valve and the pedal simulator, the pressure sensor selectively providing a sensor signal to the electronic control unit, the sensor signal being indicative of driver applied pedal force.