An electronic brake system may be capable of performing braking operation according to a pedal effort of a driver even when the brake system operates abnormally as well as simplifying a configuration thereof by minimizing the number of valves for controlling a flow of oil pressure and precisely controlling pressure therein.

An electro-hydraulic brake system includes a master cylinder (MC) configured to supply fluid into a first MC fluid passageway in response to pressing force on a brake pedal; a pressure supply unit (PSU) assembly having a PSU motor coupled to a ball screw actuator, a PSU housing defining a piston bore having a terminal end opposite the PSU motor, and a PSU piston dividing the piston bore into a first chamber and a second chamber and movable by the ball screw actuator, with each of the first chamber and the second chamber containing a hydraulic fluid; and a backup pump assembly including a pump for supplying the brake fluid to at least one of the wheel brakes. The ball screw actuator includes an actuator nut assembly having a plurality of ball bearings each disposed within the piston bore and submerged in the hydraulic fluid.

To provide a brake control apparatus that brings a brake operating member to a proper position during antilock control. At least during operation of an antilock controller 105, valves 23 and 24 are actuated to impart a stroke to a piston 52P with hydraulic pressure generated by the pump 7.

A vehicle control apparatus executes a yaw moment control to control a yaw rate of a vehicle to a target yaw rate by adjusting braking or driving forces applied to wheels of the vehicle and a speed difference control to control front and rear wheel speed differences within predetermined ranges by adjusting the braking or driving forces. The vehicle control apparatus executes the yaw moment control to the front wheels when the front wheel speed difference is within the predetermined range and executes the speed difference control to the front wheels when the front wheel speed difference is not within the predetermined range. The vehicle control apparatus executes the yaw moment control to the rear wheels when the rear wheel speed difference is within the predetermined range and executes the speed difference control to the rear wheels when the rear wheel speed difference is not within the predetermined range.

a brake apparatus capable of improving a brake operation feeling is provided. A brake apparatus includes a stroke simulator including a piston configured to be activated axially in a cylinder with use of brake fluid supplied from a master cylinder. The piston divides an inside of the cylinder into at least a positive pressure chamber and a backpressure chamber. The piston is configured in such a manner that a pressure-receiving area racing the backpressure chamber is smaller than a pressures-receiving area facing the positive pressure chamber. The stroke simulator is configured to generate, thorough the activation of the piston, an operation reaction force according to a brake operation performed by a driver. The brake apparatus further includes a second oil passage provided between the positive pressure chamber and the master cylinder, a third oil passage connecting between the backpressure chamber and the first oil passage, a fourth oil passage connecting between the backpressure chamber and the reservoir tank, and a switching unit configured to switch a connection of the backpressure chamber between a connection between the backpressure chamber and the first oil passage and a connection between the backpressure chamber and the reservoir tank.

The invention relates to an actuating system for a vehicle brake, with an actuating arrangement, in particular a brake pedal, at least one (first) piston-cylinder unit, which is connected via a hydraulic line to the vehicle brake (braking circuit) in order to supply the braking circuit with pressure medium and apply pressure to the vehicle brake, and with a drive for the piston-cylinder unit. According to the invention, pressure medium can be fed to the braking circuit in controlled manner in both piston movement directions, in particular the advance stroke and the return stroke, by means of at least one, in particular stepped, piston (10) of the piston-cylinder unit (10, 10a, 10b).

A vehicle brake system for giving an excellent brake feeling to a driver includes: a stroke detector configured to detect a stroke of a brake pedal; a brake fluid pressure generator including a motor actuator and configured to generate a brake fluid pressure by operation of the motor actuator, and a controller configured to control the operation of the motor actuator on the basis of a detected value by the stroke detector. The controller has a base required-deceleration map for obtaining a base required-deceleration associated with a detected value by the stroke detector; a responsive-feeling required-deceleration map for obtaining a responsive-feeling required-deceleration associated with the detected value by the stroke detector; and a phase-lag processor applying phase-lag processing on the responsive-feeling required-deceleration, and control the operation of the motor actuator on the basis of the required-deceleration and the responsive-feeling required-deceleration applied with the phase-lag processing.

A brake operation unit includes, for example, a master cylinder that movably houses a piston moving in connection with an operation member; an electric discharging unit including a motor and a discharging mechanism that is caused to discharge a working fluid by operation of the motor; and a reaction force applying mechanism that applies a reaction force to the operation member. A second central axis of the motor is separated from a first central axis of the master cylinder, and intersects a direction parallel to the first central axis. When viewed in a direction parallel to the second central axis, the first central axis is located between the second central axis and the reaction force applying mechanism.

A brake system for hydraulically actuating a pair of front wheel brakes and a pair of rear wheel brakes includes master cylinder fluidly connected to a reservoir and operable to provide a brake signal responsive to actuation of a brake pedal connected thereto. The master cylinder is selectively operable in a manual push-through mode. First and second power transmission units are in fluid communication with the reservoir and selected front and rear wheel brakes. An electronic control unit selectively controls at least one of the first and second power transmission units. First and second two-position three-way valves are each hydraulically connected with a respective power transmission unit, the master cylinder, and a respective front wheel brake. The first and second two-position three-way valves are configured to place the master cylinder in push-through fluid-supplying connection with at least a corresponding one of the pair of front wheel brakes.

According to an embodiment, it provides a brake system comprising a pedal simulator connected to a master cylinder and configured to provide a driver with a pedal feeling upon receiving a hydraulic pressure in accordance with a driver's pedal force, wherein the pedal simulator comprises: a damping housing having an air chamber, installed at a block having a bore communicating with an oil hole connected to the master cylinder, and configured to seal the bore; a reaction force unit configured to provide a pedal reaction force by being compressed by oil introduced through the oil hole; and a check valve disposed in a passage through which the air chamber communicates with the external air.