A non-return valve having a valve opening spring is positioned between an unpressurized brake fluid reservoir and a brake master cylinder of a hydraulic vehicle power brake system having an externally-powered brake pressure generator. The non-return valve allows for a flow-through in the direction of the brake master cylinder and blocking against a return flow from the brake master cylinder into the brake fluid reservoir starting at a counterpressure in the brake master cylinder specified by the valve opening spring.

The disclosure relates to method for activating a fluid solenoid valve in a fluid system of a vehicle, in which, in order to set a switching mode, an activation voltage applied to a coil arrangement of the fluid solenoid valve. It is provided here that the activation voltage is set depending on an operating criterion to at least two different operating modes, wherein, in a first operating mode, a current regulation of the coil current flowing through the coil arrangement is performed, and in a second operating mode differing from the first operating mode.

A brake control device includes a pilot-type pressure-increasing device. A pilot unit of the pressure-increasing device is connected to a power hydraulic pressure generating device via a pilot input passage. A linear control valve that is also used for adjusting a hydraulic pressure of a wheel cylinder is provided on the pilot input passage. A brake ECU checks whether the pressure-increasing device is normally activated or not based on a hydraulic pressure outputted from the pressure-increasing device when the linear control valve is energized for an activation check. Thus, the brake ECU can perform the activation check of the pressure-increasing device without requiring a driver's operation on a brake pedal.

A method for operating a brake system, which brake system includes a master brake cylinder, which is actuated by the driver with the aid of a brake force booster, a driver-independent pressure source, and at least one wheel brake to which a wheel speed sensor is assigned. During a braking operation initiated by the driver, which is identified in particular by a brake lamp switch, the present vehicle deceleration is determined and compared with a predefined threshold value, and the at least one driver-independent pressure source is activated if the determined vehicle deceleration reaches or falls below the predefined threshold value. A brake system for a motor vehicle, which brake system has a control unit in which the method is carried out is also disclosed.

A method for determining a switching state of a valve that is actuated by a coil, wherein the method includes: respectively ascertaining a current flowing through the coil and a voltage applied to the coil at several times which follow one another with a prespecified time interval, calculating an inductance variable of the coil based on the currents, the voltage and the time interval, and determining the switching state based on the inductance variable. Also disclosed is a solenoid valve assembly.

A rotational monitoring system of at least one axle designed to identify at least one axle controlled by it having an estimated instantaneous linear speed lower than a predetermined instantaneous linear limit speed, and remove the braking force to one or more wheels of the axle identified to have an estimated instantaneous linear speed lower than the predetermined instantaneous linear limit speed, by canceling a pressure to brake cylinders associated with the at least one axle identified to have an estimated instantaneous linear speed lower than the predetermined instantaneous linear limit speed. The cancellation of a pressure is obtained by acting on an electro-pneumatic valve designed to perform a Remote Release function associated with the pneumatic circuits generating braking pressure for the brake cylinders and adapted to cancel a residual braking pressure.

A method for operating a brake system. A brake request signal is generated, and a setpoint brake pressure required in an active circuit is ascertained. An actual brake pressure is set according to the setpoint brake pressure. A wheel brake actuated by the active circuit is hydraulically decoupled from the pressure generation device by closing an isolation valve, which is situated between the pressure generation device and the wheel brake, the isolation valve is preloaded to a closed state counter to an inflow direction of a volume flow into a brake-side section between the isolation valve and the wheel brake. A hydraulic recoupling of the wheel brake takes place by opening the isolation valve in that the actual brake pressure is set according to the setpoint brake pressure and an opening force is simultaneously applied to the isolation valve such that a compensation of a closing force takes place.

To avoid an exceedance of a permissible maximum pressure in a hydraulic vehicle power braking system including anti-slip regulation, continuous valves are to be utilized as inlet valves of wheel brakes of the vehicle braking system, and the inlet valve of a wheel brake, whose outlet valve will be opened or is open in order to regulate the wheel brake pressure, is to be partially closed, so that this inlet valve acts as a throttle and limits a brake pressure in the vehicle braking system.

A method for operating a brake system. A brake request signal is generated, and a setpoint brake pressure required in an active circuit is ascertained. An actual brake pressure is set according to the setpoint brake pressure. A wheel brake actuated by the active circuit is hydraulically decoupled from the pressure generation device by closing an isolation valve, which is situated between the pressure generation device and the wheel brake, the isolation valve is preloaded to a closed state counter to an inflow direction of a volume flow into a brake-side section between the isolation valve and the wheel brake. A hydraulic recoupling of the wheel brake takes place by opening the isolation valve in that the actual brake pressure is set according to the setpoint brake pressure and an opening force is simultaneously applied to the isolation valve such that a compensation of a closing force takes place.

A valve assembly including: a valve body comprising a valve chamber, a first fluid port, a second fluid port, and a third fluid port, wherein the first fluid port, the second fluid port and the third fluid port are in fluid communication with the valve chamber; a first plunger movably disposed within the valve chamber, wherein when the first plunger is in the open position, the first fluid port is in fluid communication with the second fluid port, and wherein when the first plunger is in the closed position the first fluid port is fluidly isolated from the second fluid port; and a second plunger movably disposed within the valve chamber, wherein when the second plunger is in the open position the second fluid port (8b) is in fluid communication with the third fluid port, and wherein when the second plunger is in the closed position, the second fluid port is fluidly isolated from the third fluid port.