The invention relates to an electronically controllable secondary brake system (46), operated by pressure medium, useable as both as a parking brake system and an auxiliary brake system, with spring brake cylinders (68a, 68b) arranged on wheel brakes of at least one vehicle axle (8), with a directly or indirectly electronically controllable brake control valve (56). The brake force of the spring brake cylinder (68a, 68b) can be reduced by a feed of pressure medium and can be increased by a discharge of pressure medium, and with an electronic brake control unit (48) for controlling the brake control valve (56) dependent on the current value of a brake value signal (SBW). The brake control valve (56) is configured as a 3/3-way proportional valve with a pressure medium inlet, a pressure medium outlet, and a working connector, which is connected via a working line (60, 66) to the spring brake cylinders.

The apparatus comprises a sensor for generating a vehicle load signal, weighting devices designed to supply a weighted pneumatic pressure as a function of the load signal, and first and second braking control apparatus, both coupled to the weighting devices and comprising respective relay valves which supply at their outlets respective braking pressures, modulated as a function of said weighted pneumatic pressure, to respective braking actuators associated with the wheels of a respective axle or of a respective bogie of the vehicle. The weighting devices comprise an electro-pneumatic drive assembly which is interposed between pneumatic pressure supply means and the drive inlet of the relay valves and an electronic weighting control unit which controls the drive assembly as a function of the load signal, so as to modulate in a predetermined way the pressure at the drive inlet of the relay valves.

A control valve (3) of a compressed air system of a vehicle has a control piston (22), guided in an axially movable manner in a housing cylinder (25), two pressure chambers (32, 34) separated from one another by the control piston (22), which is sealed by at least one sealing ring (37) arranged on the outer circumference of the control piston (22). The sealing ring (37) is a radial sealing ring having an axial length which substantially corresponds to the axial thickness of the control piston (22). The sealing ring (37) has, on each of the two axial edges thereof, one respective radially obliquely outwardly directed sealing lip (39, 40) which is in contact with the inner wall (38) of the cylinder (25), and that a plurality of guide members (50) distributed over the circumference and formed between the two sealing lips (39, 40) on the sealing ring (37).

An electropneumatic parking brake system for a utility vehicle includes a precontrol module configured to control at least a first control pressure. The precontrol module has a precontrol store connection configured to receive a store pressure from a compressed air device and at least one precontrol valve combination. The electropneumatic parking brake system further includes at least one manually actuatable sliding valve connected to a valve store connection and having a parking brake connection. The parking brake connection is ventilated in a first switching position of the sliding valve and a parking brake pressure at the parking brake connection is controllable in a second switching position of the sliding valve. The sliding valve has a first pneumatic control connection at which the first control pressure is configured to be controlled in order to pneumatically switch the sliding valve.

A fluid-operated braking system (1) for a tractor-trailer vehicle includes a trailer control valve (2), a parking brake module (3), and an electronic control unit (4) electrically connected to the trailer control valve (2) and to the parking brake module (3). A pressure fluid accumulator (13) of the braking system (1) is connected to a control pressure input (P43) of the trailer control valve (2). A redundancy circuit controls the control pressure input (P43), even during a malfunction of the control unit (4). The parking brake module (3) includes a control valve (14), a redundancy valve (15) and a changeover valve (16) controlled by an electronic switch unit (20) with a holding function. When the control unit (4) malfunctions, the last error-free switching position of the control valve (14) or the redundancy valve is maintained until a operationally safe resting state is reached or the ignition system is switched off.

An electronically controllable pneumatic brake system for a vehicle includes wheel brakes for braking wheels of the vehicle, wherein axle modulators specify a service brake braking pressure to the wheel brakes in dependence upon a service brake control pressure. The brake system further includes a foot brake valve configured to pneumatically specify the service brake control pressure to the axle modulators, wherein the service brake control pressure can be generated by the foot brake valve in dependence upon a mechanical imposition or in dependence upon an electropneumatic imposition. The brake system additionally includes a bypass valve arrangement configured to specify a foot brake input pressure to the foot brake valve, the foot brake input pressure being used as an electropneumatic imposition.

An electronically controlled pneumatic (ECP) overlay control valve can selective switch between a conventional pneumatic mode and an ECP mode. In ECP mode, the overlay control valve shunts the brake cylinder pressure of the pneumatic control valve which allows a relay valve to build or exhaust pressure in the brake cylinder in response to an electronically controlled apply/release circuit. In conventional pneumatic mode, the overlay control valve disconnects the relay valve and allows a conventional pneumatic control valve to control the pressurization and exhausting of the brake cylinder.

Systems and methods for immobilization of a vehicle include a remote device coupled to a network, the remote device including a transceiver, and a vehicle including a communication interface coupled to the network, the communication interface configured to provide telematics data to, and receive commands from, the transceiver. The system further includes an energy store on the vehicle, the energy store configured to supply electrical power to the communication interface. In some embodiments, at least one of the commands received from the transceiver is configured to immobilize the vehicle. In some cases, the at least one command received from the transceiver is configured to release air pressure in an air line of the vehicle to actuate a plurality of air brakes on the vehicle, or to actuate a wheel-lock mechanism within an electrically powered drive axle on the vehicle.

An electronically controlled pneumatic (ECP) overlay control valve can selective switch between a conventional pneumatic mode and an ECP mode. In ECP mode, the overlay control valve shunts the brake cylinder pressure of the pneumatic control valve which allows a relay valve to build or exhaust pressure in the brake cylinder in response to an electronically controlled apply/release circuit. In conventional pneumatic mode, the overlay control valve disconnects the relay valve and allows a conventional pneumatic control valve to control the pressurization and exhausting of the brake cylinder.

A solenoid valve apparatus for a brake system for a vehicle, including: a main valve unit; a pilot-control valve unit that is fluidically connected to the main valve unit; and a housing to accommodate at least the main valve unit and the pilot-control valve unit; in which the pilot-control valve unit includes a double solenoid unit and at least one valve device, in which the double solenoid unit is formed such that it can be populated with at least one valve device, and in which the double solenoid unit has at least two accommodating portions for accommodating valve devices and at least two solenoid devices for actuating valve devices. Also described are a related braking system and a related method for mounting a solenoid valve assembly for a braking system for a vehicle.