To achieve a compactly designed, simple and robust control valve for a hydrodynamic torque generator which is linear over a wide adjustment range, the control channel (12) of the control valve is formed in such a way that a substantially linear relationship between valve position () and flow ({dot over (V)}) is achieved by rotating the valve body (6) between a first valve position (.sub.1), which differs from the closed position, and a second valve position (.sub.2) with a larger flow ({dot over (V)}) than in the first position (.sub.1).

Provided is a braking device capable of increasing boost responsiveness of wheel cylinders. The braking device includes a second chamber from which a brake fluid is discharged by a movement of a piston caused by inflow of the brake fluid flowed out from a master cylinder to a first chamber through a brake operation by a driver, and a pump configured to discharge the brake fluid into an oil passage for supplying the brake fluid flowed out from the second chamber to a wheel cylinder.

An electronically pressure-controllable braking system and methods for controlling an electronically pressure-controllable braking system. Each wheel brake of the braking system is connected respectively to at least two brake circuits, pump units and valve devices of one brake circuit are operable respectively independently of the pump units and the valve devices of the respective other brake circuit. This provides a cost-effectively and compactly designed redundant braking system, which is suitable for use in autonomously, i.e., driverlessly drivable, motor vehicles.

An electronically pressure-controllable braking system and methods for controlling an electronically pressure-controllable braking system. Each wheel brake of the braking system is connected respectively to at least two brake circuits, pump units and valve devices of one brake circuit are operable respectively independently of the pump units and the valve devices of the respective other brake circuit. This provides a cost-effectively and compactly designed redundant braking system, which is suitable for use in autonomously, i.e., driverlessly drivable, motor vehicles.

A brake control mounted in a vehicle equipped with a regenerative generator on either the front wheels or the rear wheels including a first pressure adjusting unit that adjusts a liquid pressure generated by a first electric motor to a first liquid pressure and provides the first liquid pressure to wheel cylinders of wheels on one side; and a second pressure adjusting unit that is configured by a fluid pump, which is driven by a second electric motor, and a pressure adjusting valve, and that performs adjustment to increase the first liquid pressure to a second liquid pressure and provides the second liquid pressure to wheel cylinders of wheels on the other side.

A motor vehicle brake system includes at least four hydraulically actuatable wheel brakes, a main pressure medium reservoir, at atmospheric pressure, a first electrohydraulic brake control device, which, for each of the four wheel brakes, includes a wheel-specific outlet, and a second electrohydraulic brake control device, which, for each of the four wheel brakes, includes a wheel-specific inlet, connected to the wheel-specific outlet of the first brake control device, a wheel-specific wheel outlet, connected to the wheel brake, and a hydraulic wheel connecting line, connecting the inlet to the wheel outlet. The second brake control device includes a first pump with a first pressure side and first suction side. The first pressure side connected to a first and second wheel connecting line, and a second pump with a second pressure side and second suction side. The second pressure side connected to the third and the fourth wheel connecting line.

A motor vehicle brake system includes at least four hydraulically actuatable wheel brakes, a main pressure medium reservoir, at atmospheric pressure, a first electrohydraulic brake control device, which, for each of the four wheel brakes, includes a wheel-specific outlet, and a second electrohydraulic brake control device, which, for each of the four wheel brakes, includes a wheel-specific inlet, connected to the wheel-specific outlet of the first brake control device, a wheel-specific wheel outlet, connected to the wheel brake, and a hydraulic wheel connecting line, connecting the inlet to the wheel outlet. The second brake control device includes a first pump with a first pressure side and first suction side. The first pressure side connected to a first and second wheel connecting line, and a second pump with a second pressure side and second suction side. The second pressure side connected to the third and the fourth wheel connecting line.

A control device is provided with a flow rate derivation part for deriving a pressure-holding-valve flow rate on the basis of a pressure command value and a previous pressure command value; a differential pressure derivation part for deriving a differential-pressure-valve differential pressure value so that the differential-pressure-valve differential pressure value increases with an increase in the difference obtained by subtracting the pressure-holding-valve flow rate from a pump-discharge flow rate; and a pressure-holding-valve processing part for performing an aperture derivation process to derive a command aperture so that the command aperture decreases with an increase in the difference obtained by subtracting the pressure command value from the sum of an pressure value and the differential-pressure-valve differential pressure value, and driving a holding pressure valve at the command aperture.

A control device is provided with a flow rate derivation part for deriving a pressure-holding-valve flow rate on the basis of a pressure command value and a previous pressure command value; a differential pressure derivation part for deriving a differential-pressure-valve differential pressure value so that the differential-pressure-valve differential pressure value increases with an increase in the difference obtained by subtracting the pressure-holding-valve flow rate from a pump-discharge flow rate; and a pressure-holding-valve processing part for performing an aperture derivation process to derive a command aperture so that the command aperture decreases with an increase in the difference obtained by subtracting the pressure command value from the sum of an pressure value and the differential-pressure-valve differential pressure value, and driving a holding pressure valve at the command aperture.

A braking system for a motor vehicle, having at least one brake pressure source and at least one wheel brake. In this case, it is provided that the at least one wheel brake is fluidically connected to the at least one brake pressure source via several brake pressure control devices, which are fluidically connected in parallel, wherein each of the brake pressure control devices has at least one pressure build-up valve and at least one pressure reduction valve, and that the brake pressure control devices are fluidically connected to the at least one brake pressure source via a common valve device, wherein the valve device always fluidically connects one of the brake pressure control devices to the at least one brake pressure source. The disclosure further relates to a method for operating a braking system for a motor vehicle.