A brake system for a vehicle having a master brake cylinder, which provides a pressure signal, having a brake-medium reservoir connected to the master brake cylinder, and a first brake circuit, which is coupled by a first input to the master brake cylinder and by a second input to the brake-medium reservoir, and having at least one first wheel brake cylinder, which is mounted at a first wheel, in order to exert a force corresponding to the pressure signal onto the first wheel, and having a separator valve, which is configured between the first input and the first wheel-brake cylinder, to prevent further transmission of the pressure signal upon receipt of a supplied closing signal; and having a control valve, which is configured between the first input and the first wheel-brake cylinder; in order to control an inflow of a brake medium from brake-medium reservoir to the first wheel-brake cylinder. In addition, a method for controlling a corresponding brake system is also described.

The disclosure relates to an assembly for a hydraulic motor-vehicle brake system that includes a first port for connecting to a pressure chamber of a master brake cylinder and a second port for connecting to a pressure-medium reservoir. The assembly includes an output pressure port for connecting to a pressure modulation device and a pump assembly having at least a first suction side connected to the second port. In addition, the assembly includes a first hydraulic connection that connects the first port and the output pressure port. A first valve is arranged about the first hydraulic connection and is configured to be is open when current is not applied. The assembly includes a second hydraulic connection between the first port and the second port. A second valve is arranged about the second hydraulic connection, which is closed when current is not applied.

A slip-controllable vehicle brake system includes a brake circuit to which a master brake cylinder is connected to a wheel brake. The connection between the brake circuit and the master brake cylinder is controlled by a changeover valve. To supply the wheel brake with pressure medium, the brake circuit has a pressure generator that is externally driven and interacts with a pressure build-up valve of the wheel brake. The brake system includes a pressure pulsation damping device with a pulsation damper and a resistor which forms a flow cross-section. The pressure build-up valve and/or the changeover valve is continuously adjustable and steplessly switched from an open position into a blocked position. The flow cross-section of the resistor is actualized by an electronic triggering of the pressure build-up valve or the changeover valve such that it is variably adjusted to changing environmental or operating conditions.

One embodiment provides a vehicle brake hydraulic pressure control apparatus configured to perform a vehicle hold control which controls a brake hydraulic pressure when a vehicle comes to a halt. The vehicle brake hydraulic pressure control apparatus includes: a behavior determination section configured to determine whether or not a behaving amount in a lateral direction of the vehicle is equal to or larger than a first threshold; and an operation determination section configured to determine whether or not a control member provided to control the vehicle is operated. Further, the vehicle hold control is canceled at least when the behavior determination section determines that the behaving amount is equal to or larger than the first threshold and the operation determination section determines that the control member is operated.

A method and system for operating a brake system for motor vehicles, including a plurality of wheel brakes for which wheel-individual nominal pressure includes an electrically controllable pressure supply device, to provide a brake system pressure for actuating the wheel brakes. The brake system pressure provided by the pressure supply device can be determined. An electrically controllable inlet valve and electrically controllable outlet valve per wheel brake adjust wheel-individual brake pressures. At least one outlet valve is analogized for analog-controlled and is controlled by an electric control variable, wherein at least one valve-specific control characteristic and/or a valve-specific parameter is determined for the analogized or analog-controlled outlet valve by the brake system, and wherein the analogized or analog-controlled outlet valve is controlled as a function of the valve-specific control characteristic and/or the valve-specific parameter for the degradation of the brake pressure in the wheel brake associated with the outlet valve.

A method and system for operating a motor vehicle brake system, including several wheel brakes, an electrically controllable pressure supply device, dispenses a pressure medium volume for actuating the brakes, and an analogized or analog-controlled inlet valve, arranged in each wheel brake between the pressure supply device and wheel brake, for adjusting wheel-individual brake pressures. A check valve is connected in parallel to each inlet valve. At the start of a wheel-individual brake pressure control, all inlet valves are closed, and a pressure build-up is carried out in a predetermined group of one or more wheel brakes by displacing a pressure medium volume into the predetermined group of wheel brakes by the pressure supply device. Each inlet valve of the predetermined group is controlled such that the inlet valve is overflowed, wherein each inlet valve of the remaining wheel brakes is controlled such that the inlet valve remains closed.

It is an object of the invention to provide a brake device capable of detecting a failure in each of components, by which booster control is performed, at an early stage even during vehicle running. The brake device is configured to discharge brake fluid into a communicating fluid path that connects a fluid path of a primary system and a fluid path of a secondary system, and to control a first communicating valve for restricting a flow of brake fluid from the communicating fluid path to the fluid path of the primary system and a second communicating valve for restricting a flow of brake fluid from the communicating fluid path to the fluid path of the secondary system in respective valve-closing directions, so as to check at least a state of the pump.

A braking system for a machine includes a first valve assembly having a first electronically actuated proportional valve, and a second valve assembly having a second electronically actuated proportional valve. The braking system includes a first pressure sensor and a second pressure sensor disposed downstream of the first and second valve assemblies, respectively. The first and second pressure sensors are configured to determine a first pressure and a second pressure of a braking fluid from the first and second valve assembly. The braking system also includes a controller configured to receive a signal indicative of the first pressure and the second pressure of the braking fluid and compare the first pressure and the second pressure. The controller is configured to selectively actuate at least one of the first electronically actuated proportional valve and the second electronically actuated proportional valve to substantially equalize the first pressure and the second pressure.

In a method for optimizing the pressure setting accuracy, a hydraulic pressure is built up according to a pressure requirement of a hydraulic pump, and overflow control is performed using an analog-controlling hydraulic valve and a known control characteristic curve of the analog-controlling hydraulic valve, which overflow control counteracts a pressure build-up produced by the hydraulic pump that exceeds the pressure requirement. In addition to the known control characteristic curve of the analog-controlling hydraulic valve, at least one additional valve characteristic is taken into account for the overflow control.

A brake system for a motor vehicle comprises a hydraulic line system with at least one normally closed hydraulic valve, wherein a final stage is provided for electrically actuating the at least one hydraulic valve. To minimize noise emissions, the final stage is a final stage with analog control and a computing unit is provided which is configured to determine a valve current based on a pressure difference across the hydraulic valve and to actuate the final stage to make the valve current available at the hydraulic valve.