A brake system for a vehicle which includes a 3-way solenoid valve to reduce the number of solenoid valves mounted to the brake system.

A vehicle braking device includes: a first hydraulic pressure output unit that is connected to a master chamber through a first liquid passage and outputs hydraulic pressure to first wheel cylinders based on a hydraulic pressure of the first liquid passage; a hydraulic pressure generating unit that generates hydraulic pressure independently of a master cylinder; a second hydraulic pressure output unit that is connected to the hydraulic pressure generating unit through a second liquid passage and outputs hydraulic pressure to second wheel cylinders based on a hydraulic pressure of the second liquid passage; a normally closed communication control valve that is provided in a communication passage connecting the first liquid passage and the second liquid passage and opens and closes the communication passage; and a normally open master cut valve in the first liquid passage on the master cylinder side relative to a connection portion with the communication passage.

A brake system is provided comprising a reservoir, master cylinder, hydraulic pressure supply unit, hydraulic control unit, pressure sensor, and controller. The controller identifies a filling control sequence start when a pressure detection signal rises above and maintains a predetermined first reference pressure during standby mode. Subsequently, the controller identifies air evacuation mode entry when the signal falls below a second reference pressure, and fluid filling mode entry when the signal rises again. During air evacuation mode, the controller repeatedly opens and closes hydraulic control unit valves to discharge air from fluid passages. During fluid filling mode, the controller drives the hydraulic pressure supply unit motor to supply pressure medium. This autonomous filling control system operates solely on pressure sensor signals without requiring external equipment communication, enabling self-contained brake system charging through precise pressure profile analysis and automated mode transitions.

According to at least one embodiment, the present disclosure provides a method for determining failure of a solenoid valve in a brake system, the method comprising: a first valve operation process of opening a backup valve that controls opening and closing of a flow path disposed between a master cylinder and a pedal cylinder and opening and closing a plurality of valves other than the backup valve in a preset manner; a first determination process of moving a piston disposed in a master cylinder to a preset first position and determining whether the backup valve is in a failure state using a pressure sensor; a second valve operation process of closing a mixing valve that controls opening and closing of a flow path disposed between a front wheel circuit and a rear wheel circuit, and opening and closing the plurality of valves other than the mixing valve in a preset manner; and a second determination process of moving the piston disposed in the master cylinder to a preset second position and determining whether the mixing valve is in a failure state using a pressure sensor.

The present invention provides a brake control apparatus capable of both curbing cost and minimizing a size increase at the same time when redundancy is implemented for only a required system. A brake control apparatus includes an electromagnetic valve device including a first coil to which a first terminal and a second terminal are connected, and a second coil to which a third terminal and a fourth terminal are connected, in parallel with each other, a housing where the electromagnetic valve device is disposed, and a one control board disposed offset from one end surface of the housing in a direction of an axis around which the first coil is wound. All of the terminals are connected to the one control board.