An electrohydraulic brake control device (200) for a motor vehicle for at least four hydraulically actuatable wheel brakes (8a-8d), said brake control device comprising an electrically actuatable pressure source (2), an electrically actuatable inlet valve (6a-6d) for each wheel brake, an electrically actuatable outlet valve (7a-7d) for each wheel brake, and a brake supply line (13), to which the at least four inlet valves (6a-6d) are connected, wherein an electrically actuatable circuit separation valve (40) is arranged in the brake supply line (13) in such a way that, when the circuit separation valve (40) is closed, the brake supply line (13) is hydraulically separated into a first line section (13a) and a second line section (13b), wherein the brake control device (200) comprises at least four hydraulic wheel ports (9a-9d) for connection to the wheel brakes (8a-8d), wherein the brake control device (200) comprises a first hydraulic port (62) for connection to a pressure medium reservoir (4) and a second hydraulic port (61) for connecting a further pressure source (5) to the brake control device (200), wherein the first line section (13a) of the brake supply line (13) is hydraulically connected to the electrically actuatable pressure source (2) and at least two of the at least four inlet valves (6a, 6b), and the second line section (13b) of the brake supply line (13) is hydraulically connected to the second hydraulic port (61) and the other of the at least four inlet valves (6c, 6d), and a brake system for a motor vehicle comprising such a brake control device (200).

Wheel pressure estimation apparatus and method are disclosed. A wheel pressure estimation apparatus includes: an inputter configured to receive a brake signal output from an electronically controlled brake apparatus and receive a brake pedal signal detected from a detector and a pressure value of a master cylinder, an estimator configured to estimate a discharge flow rate of a motor pump generated by a suctioning operation of the motor pump to estimate a wheel pressure when the brake signal is received, a determiner configured to determine whether a driver intends to brake according to whether the brake pedal signal is input and a controller configured to control the estimator to estimate the wheel pressure again using discharge flow rate model information in which the pressure value of the master cylinder is applied to the discharge flow rate of the estimated motor pump, when the driver intends to brake.

Wheel pressure estimation apparatus and method are disclosed. A wheel pressure estimation apparatus includes: an inputter configured to receive a brake signal output from an electronically controlled brake apparatus and receive a brake pedal signal detected from a detector and a pressure value of a master cylinder, an estimator configured to estimate a discharge flow rate of a motor pump generated by a suctioning operation of the motor pump to estimate a wheel pressure when the brake signal is received, a determiner configured to determine whether a driver intends to brake according to whether the brake pedal signal is input and a controller configured to control the estimator to estimate the wheel pressure again using discharge flow rate model information in which the pressure value of the master cylinder is applied to the discharge flow rate of the estimated motor pump, when the driver intends to brake.

A method for operating a pneumatic system of a vehicle is disclosed. The pneumatic system comprises an electronically and/or pneumatically controlled compressor which supplies compressed air during a normal mode and which is switched off or idles when not supplying compressed air. In the method, an ambient temperature (T_Umg) around the pneumatic system is continuously sensed and compared with a predefined target temperature (T_Ziel), a freezing risk is detected when the ambient temperature (T_Umg) reaches or drops below the target temperature (T_Ziel), and when a freezing risk has been detected, a cold mode is activated in which the compressor delivers compressed air also outside delivery phases of the normal mode, and additional compressed air is supplied to pneumatic system components that risk freezing. An additional ON time (ED_zus) of the compressor in the cold mode is variably controlled.

A method for operating a pneumatic system of a vehicle is disclosed. The pneumatic system comprises an electronically and/or pneumatically controlled compressor which supplies compressed air during a normal mode and which is switched off or idles when not supplying compressed air. In the method, an ambient temperature (T_Umg) around the pneumatic system is continuously sensed and compared with a predefined target temperature (T_Ziel), a freezing risk is detected when the ambient temperature (T_Umg) reaches or drops below the target temperature (T_Ziel), and when a freezing risk has been detected, a cold mode is activated in which the compressor delivers compressed air also outside delivery phases of the normal mode, and additional compressed air is supplied to pneumatic system components that risk freezing. An additional ON time (ED_zus) of the compressor in the cold mode is variably controlled.

A piston pump for delivering fluids includes a piston, a cylinder element and a pressure chamber which is arranged between an inlet valve and an outlet valve and is closed by a cover, wherein a throttling mechanism for throttling the fluid flow is provided in the fluid flow downstream of the outlet valve, and a vehicle brake system has a piston pump of this type. The throttling mechanism includes a movable annular disc which is guided on the cylinder element and the internal diameter of which is adapted to the external diameter of the cylinder element, wherein the axial travel of the annular disc sets a variable first throttle cross section.

A method for supplying vacuum for a pneumatic brake booster for a motor vehicle braking system, using an electromotively-driven displacement type pump assembly. At least one pressure sensor for monitoring a pneumatic pressure is associated with the pump assembly, and electric signals of the pressure sensor are fed to an electronic unit, analyzed, and processed in order to regulate the pressure. A plausibility check of the pressure sensor signal is carried out by a pressure value amplitude being determined, by signal analysis, in the form of a difference between a maximum pressure value and a minimum pressure value within a stroke of the displacement element, and this being compared to a stored comparison value wherein if the pressure value amplitude deviates from the comparison value by a defined amount, the signal of the pressure sensor is then defined as implausible.

A method for supplying vacuum for a pneumatic brake booster for a motor vehicle braking system, using an electromotively-driven displacement type pump assembly. At least one pressure sensor for monitoring a pneumatic pressure is associated with the pump assembly, and electric signals of the pressure sensor are fed to an electronic unit, analyzed, and processed in order to regulate the pressure. A plausibility check of the pressure sensor signal is carried out by a pressure value amplitude being determined, by signal analysis, in the form of a difference between a maximum pressure value and a minimum pressure value within a stroke of the displacement element, and this being compared to a stored comparison value wherein if the pressure value amplitude deviates from the comparison value by a defined amount, the signal of the pressure sensor is then defined as implausible.

A compressed air supply device for operating a pneumatic installation comprises an air supply unit configured to supply air, an air compression unit configured to compress air, a bleeding line comprising a controllable solenoid valve arrangement, the solenoid valve arrangement having a magnetic part and a pneumatic part, and a bleeding port configured to bleed air. The device also comprises a compressed air supply line having an air drier and a compressed air port, the compressed air supply line being configured to supply the pneumatic installation with compressed air, wherein the pneumatic part is open when the magnetic part is not activated.

A compressed air supply device for operating a pneumatic installation comprises an air supply unit configured to supply air, an air compression unit configured to compress air, a bleeding line comprising a controllable solenoid valve arrangement, the solenoid valve arrangement having a magnetic part and a pneumatic part, and a bleeding port configured to bleed air. The device also comprises a compressed air supply line having an air drier and a compressed air port, the compressed air supply line being configured to supply the pneumatic installation with compressed air, wherein the pneumatic part is open when the magnetic part is not activated.