A pneumatic brake for a vehicle is provided. The pneumatic brake includes a housing and a single diaphragm within the housing that divides the housing into front and rear variable-volume chambers. A push rod is disposed in the front chamber and extends outwardly from the housing. A parking spring is disposed in the rear chamber and urges the diaphragm and push rod towards the front chamber. A valve body extends through the rear chamber and includes an elongated stem disposed in a telescoping relationship with the push rod. In resting and activation modes, brake pressure is applied by the parking spring to the top plate to activate a brake function. In a deactivation mode, pneumatic pressure is supplied to the front chamber to compress the parking spring and disengage the brake. A brake system including the pneumatic brake and an ABS is also provided.

A method is for operating a parking brake system with a spring-loaded brake and a control module in a motor vehicle or trailer. The control module is connected to a parking brake circuit. The method includes supplying the parking brake circuit with reservoir pressure. The method further includes applying spring-loaded accumulator holding pressure to the spring-loaded brake cylinders in order to have the spring-loaded brake assume a release position, wherein the spring-loaded accumulator holding pressure is less than the reservoir pressure in the parking brake circuit.

An electro-pneumatic parking brake arrangement includes a shut-off valve and a parking brake module. The parking brake module includes a reservoir connection configured to connect to a compressed air reservoir, a first spring-loaded accumulator connection configured to connect to the shut-off valve, an electro-pneumatic valve unit having at least one electro-pneumatic valve configured to output a spring-loaded brake pressure at the first spring-loaded accumulator connection, and an electronic control unit configured to receive parking brake signals from an electronic parking brake switch and/or a higher-order control unit. The shut-off valve comprises a second spring accumulator connection configured to connect the spring-loaded brakes of the further axle and to shut off the second spring accumulator connection depending on a shut-off signal provided by the parking brake module.

A trailer control valve for a tractor includes a body defining a supply port and first and second delivery ports. The supply port is configured for fluid communication with a fluid source on the tractor. The first and second delivery ports are configured for fluid communication with glad-hand connectors through which fluid is supplied from the tractor to a trailer for, respectively, releasing a parking brake and applying a service brake. The first delivery port is in fluid communication with the supply port. A relay valve is supported within the body and includes a valve member configured to move between positions preventing and permitting fluid communication between the supply port and the second delivery port. Pressure transducers in the body generate pressure signals indicative of fluid pressure at the delivery ports permitting detection of the presence of a trailer coupled to the tractor.

An electropneumatic-equipment of a vehicle, including: a) an electropneumatic-parking-brake-device (EPBD) having an electropneumatic-parking-brake-control-device (EPBCD), a compressed-air-supply and pneumatic-spring-type brake-cylinder, b) the EPBCD has an electronic-parking-brake-control-unit (EPBCU), a first valve-device including a first solenoid-valve and valve-pressure controlled thereby, the first solenoid-valve being controlled by the EPBCU, c) a pneumatic-control-input of the pressure-controlled valve is connected to the first solenoid-valve and a working-output of the pressure-controlled valve is connectable to the spring-type brake-cylinder, d) the first solenoid-valve is connected to the compressed-air-supply and pressure-sink, e) the first solenoid-valve is configured such that it connects the pneumatic-control-input of the pressure-controlled valve to the compressed-air-supply/pressure-sink, f) the pressure-controlled valve is configured such that for deaeration of its pneumatic-control-input, it deaerates its working-output and for aeration of its pneumatic-control-input, it aerates its working-output, and g) a second valve-device having a second solenoid-valve, connected to the pneumatic-control-input of the pressure-controlled valve of the first valve-device and is configured such it connects the pneumatic-control-input of the pressure-controlled valve to a further pressure-sink or blocks such a connection, h) the EPBCD is supplied with electrical-energy by two electrical-energy-sources, a first electrical-energy-source and second electrical-energy-source, and i) the second solenoid-valve of the second valve-device is energized/deenergized by the two energy-sources or by two electronic-control-units, of which a first electronic-control-unit and a second electronic-control-unit is supplied with electrical energy by another energy-source.

A method for controlling a compressed air brake system of a vehicle includes outputting an analog driver brake pressure via a brake pressure control line during driver braking by operating a brake pedal, a switching device set in a driver braking position to a brake circuit with at least one ABS stop valve device, a brake line, and a wheel brake. The method additionally includes, in the presence of both driver braking and the external brake demand signal, measuring the driver brake pressure and determining a driver brake pressure value. Furthermore, the method includes forming a combined brake pressure value by adding or superimposing the driver brake pressure value and an external brake pressure value contained in the external brake demand signal, and switching the switching device into the functional position and controlling the combined brake pressure value from the system pressure by actuating the ABS stop valve device.

The invention relates to an electropneumatic brake system (1) for a commercial vehicle. The brake system (1) comprises brake control modules (8) by which it is possible to generate a brake pressure for service brake cylinders (6) which can be associated with single vehicle wheels or vehicle wheels of a vehicle axle. According to the invention there is a redundant compressed air supply of the brake control modules (8) by connecting the brake control modules (8) both to a compressed air reservoir (41, 42) as well as to a backup compressed air reservoir (43).

The invention relates to an electromagnetic valve device having an armature (18) which is moveable in an axial direction in a valve housing (10) in response to energizing of a stationary coil (12), and which is designed to interact with a first valve seat (22) associated with a fluid inlet connection (26) of the valve housing, a first fluid flow path (36) being formed in the valve housing such that fluid flowing through the opened first valve seat can flow in order to actuate a plunger (32) moveable relative to the armature (18) and to which a preloading force is applied, the actuation causing a second valve seat (43) interacting with the plunger (32) to be opened to produce a fluid connection to a fluid working connection (42) of the valve housing, and the valve housing having a fastening structure (44, 46) in the form of at least one hole extending at an angle to the axial direction, the fluid inlet connection (26) and the working connection (42) being formed on the same axial side of the valve housing in relation to the structure means.

An electromagnetic valve device having a fluid inlet port (1), which is formed in a valve casing (10), for a fluid to be switched, in particular pneumatic fluid, a working port (2), which is realized in the valve casing, for the fluid and locking component(s) (14), which are moveably guided in the valve casing along an axial direction and which are realized for interacting with a valve seat (26) formed in the valve casing and opening a fluid flow path between the fluid inlet port and the working port and which are moveably realized via fluid switched by means of electromagnetic positioning means (32).

A two-position gate valve has a gate defining a full-flow passageway therethrough and defining a restricted-flow passageway therethrough, without defining a closed position. The full-flow passageway has an entrance with a first area and an exit with a second area, the second area being smaller than the first area, and the full-flow passageway continuously tapers from the entrance to the exit thereof. The restricted-flow passageway has an entrance with a third area and has an exit with a fourth area, the fourth area being smaller than the first area, the second area, and the third area, and the restricted-flow passageway continuously tapers from the entrance to the exit thereof. Flow through the full-flow passageway is in a first direction and flow through the restricted-flow passageway is also in the first direction and the ratio of the fourth area to the second area is in a range of 5 to 15.