According to at least one embodiment, the present disclosure provides an electric hydraulic brake including: a plurality of wheel brakes configured to supply braking force to wheels of a vehicle; a reservoir storing brake oil; a master cylinder connected to the reservoir and configured to generate hydraulic pressure in cooperation with a motor; a hydraulic circuit configured to selectively transmit the hydraulic pressure to the plurality of wheel brakes, the hydraulic circuit including a front wheel hydraulic circuit to transmit the hydraulic pressure to a pair of front wheel brakes, a rear wheel hydraulic circuit to transmit the hydraulic pressure to a pair of rear wheel brakes, and a plurality of solenoid valves; a first controller configured to control the motor and the hydraulic circuit in accordance with braking input; and a second controller configured to control the motor and the front wheel hydraulic circuit when the first controller malfunctions.

A brake system may include an actuating device, in particular a brake pedal; a first piston-cylinder unit having two pistons subjecting the brake circuits to a pressure medium via a valve device, wherein one of the pistons can be actuated by the actuation device; a second piston-cylinder unit having an electric motor drive, a transmission at least one piston to supply at least one of the brake circuits with a pressure medium via a valve device; and a motor pump unit with a valve device to supply the brake circuits with a pressure medium. The brake system may also include a hydraulic travel simulator with a pressure or working chamber which is connected to the first piston-cylinder unit.

A brake apparatus for a vehicle, comprising: a 3-way solenoid valve unit including one or more 3-way solenoid valves, a valve block having a first surface on which the 3-way solenoid valve unit is installed, at least one accumulator, a pressurizing unit, and a plurality of wheel cylinders, wherein each 3-way solenoid valve includes a first port, a second port, a third port, a first opening/closing flow path, and a second opening/closing flow path, and at least a part of the at least one accumulator is disposed between the 3-way solenoid valve unit and a second surface of the valve block.

Disclosed are a vehicle braking system and a control method thereof, which are a vehicle braking system capable of detecting an offset of a pressure sensor regardless of whether a brake pedal is provided, and a control method thereof, including a first brake device, a first pressure sensor for measuring an internal pressure of the first brake device; and a first offset determinator for determining that an offset has occurred in the first pressure sensor when a first cut valve provided in the first brake device is opened and the state in which a measurement of the first pressure sensor exceeds a first reference pressure is maintained for more than a first reference time.

A brake system for a motor vehicle, having a first hydraulic brake device configured to brake wheels on a first axle of the motor vehicle, a first control unit configured to control the braking operation of the wheels on the first axle; and a second hydraulic brake device configured to brake the wheels on a second axle of the motor vehicle, and a second control unit configured to control the braking operation of the wheels on the second axle. The first control unit is coupled with the second control unit via a communication channel. The first control unit and the second control unit are each configured to receive data that are relevant for the control of the braking operation, the first control unit furthermore being configured to transmit a data signal on the basis of the received data via the communication channel to the second control unit.

In a hydraulic brake system, when a main power supply is in an abnormal condition in which it cannot supply electric power to a pump motor, etc., the pump motor is operated with electric power supplied from an auxiliary power supply, irrespective of the presence of a braking request. Thus, when the main power supply is in the abnormal condition, the number of times inrush current flows is reduced. As a result, the voltage of the auxiliary power supply is less likely to be lower than an operation minimum voltage, and the hydraulic brake system is less likely to be unable to be operated.

An electro-hydraulic brake system comprises a single-circuit master cylinder (MC) fluidly coupled to a first MC fluid passageway and configured to supply fluid into the first MC fluid passageway in response to pressing force on a brake pedal coupled thereto. The electro-hydraulic brake system also comprises a pressure supply unit (PSU) assembly including an electric motor coupled to a ball screw actuator, a PSU housing defining a piston bore having a terminal end opposite the electric motor, and a PSU piston disposed within the piston bore and movable by the ball screw actuator through the piston bore and dividing the piston bore into a first chamber and a second chamber, with each of the first chamber and the second chamber containing a hydraulic fluid. 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.

A braking control device, when stopping a vehicle in a state where a braking force is being applied to the vehicle, executes a reducing control of reducing the braking force corresponding to a braking request before the vehicle stops and executes an increasing control of increasing the braking force corresponding to the braking request before the reducing control in order to suppress vehicle pitching behavior generated when the braking force is applied to the vehicle. The control device sets braking force increase amount in the increasing control based on a difference distance that is a difference between a first distance correlated with a vehicle traveling distance from a reduction start timing when the reducing control is executed until the stopping of the vehicle and a second distance correlated with a vehicle traveling distance from the reduction start timing when the reducing control is not executed until the stopping of the vehicle.

A vehicle braking device includes a first supply device that supplies brake fluid to wheel cylinders, a first supply path that connects the first supply device and the wheel cylinders, and first and second electromagnetic valves provided on the first supply path. The first electromagnetic valve is disposed on the first supply path such that a seating direction of the first electromagnetic valve and a brake fluid supply direction are opposite each other, the seating direction is a direction in which a valve body is seated on a valve seat, and the brake fluid supply direction is a direction in which the brake fluid flows from the first supply device to the wheel cylinders through the first supply path. The second electromagnetic valve is disposed on the first supply path such that a seating direction of the second electromagnetic valve and the brake fluid supply direction are the same.

A method of conducting a diagnostic test to determine leakage within a brake system includes first providing a brake system having a plunger assembly including a housing defining a bore therein. The plunger assembly includes a piston slidably disposed therein such that movement of the piston pressurizes a pressure chamber when the piston is moved in a first direction. The pressure chamber of the plunger assembly is in fluid communication with an output, and wherein the plunger assembly further includes an electrically operated linear actuator for moving the piston within the bore. The linear actuator of the plunger assembly is actuated to provide pressure at the output of the plunger assembly at a first predetermined level. The pressure at the output of the plunger assembly is held for a predetermined length of time. The method further includes determining whether conditional criteria has been met indicating a leakage within the brake system.