A control valve for applying a spring-loaded brake pressure to spring-loaded parts of a rear-axle wheel brake is pneumatically activated as a function of a parking-brake braking demand and a service-brake braking demand. A first control chamber is connected via a first control piston to a control arrangement in the control valve. During an adjustment of the first control chamber via the service-brake control pressure, the spring-loaded brake pressure at the working output is a function of the service-brake control pressure or of the parking-brake control pressure. The first control piston is connected to a third control chamber, wherein the pressure in the first control chamber acts on the first control piston in one direction, and the pressure in the third control chamber acts on the first control piston in the opposite direction. The first control chamber is selectively connectable to the third control chamber via a switchable bypass valve.

A control valve for applying a spring-loaded brake pressure to spring-loaded parts of a rear-axle wheel brake is pneumatically activated as a function of a parking-brake braking demand and a service-brake braking demand. A first control chamber is connected via a first control piston to a control arrangement in the control valve. During an adjustment of the first control chamber via the service-brake control pressure, the spring-loaded brake pressure at the working output is a function of the service-brake control pressure or of the parking-brake control pressure. The first control piston is connected to a third control chamber, wherein the pressure in the first control chamber acts on the first control piston in one direction, and the pressure in the third control chamber acts on the first control piston in the opposite direction. The first control chamber is selectively connectable to the third control chamber via a switchable bypass valve.

An electropneumatic control module for an electronically controllable pneumatic brake system for a vehicle combination with a tractor vehicle and a trailer vehicle includes a pneumatic reservoir input, which is connectable to a compressed-air reservoir, and a trailer control unit, which has a trailer control valve unit with one or more electropneumatic valves, a trailer brake pressure port and a trailer supply pressure port. The electropneumatic control module further includes an immobilizing brake unit, which has a spring-type actuator port for at least one spring-type actuator for a tractor vehicle and an immobilizing brake valve unit with one or more electropneumatic valves, and an electronic control unit, wherein the electronic control unit is designed to, based on an electronic immobilizing signal, trigger the immobilizing brake valve unit to switch at least one valve of the immobilizing brake valve unit.

An electronically controllable brake system for a vehicle includes at least one service brake circuit with service brakes and a service brake control module, wherein a service-brake brake pressure can be fed to the service brakes, and the service-brake control module is designed to generate a service-brake control signal as a function of a braking specification. The service-brake brake pressure can be generated as a function of the service-brake control signal and specified to the service brakes, for the implementation of the braking specification via the at least one service brake circuit, under electrical control by the service-brake control module. The electronically controllable brake system further includes a parking brake circuit with spring-loaded brakes, wherein a parking-brake brake pressure can be fed to the spring-loaded brakes, wherein the parking-brake brake pressure can be generated as a function of the braking specification and specified to the spring-loaded brakes.

A trailer spring brake valve is provided for a vehicle air braking system. The trailer spring brake valve comprises a number of components arranged to cooperate together to provide type of brake priority based upon trailer weight.

A system for establishing an intervehicle communication for at least first and second commercial vehicles includes at least one wireless, wired, and/or physical communication line, wherein the communication line is bidirectional. At one point of the communication line, a first authentication code generation module is provided, which is dedicated to the first vehicle. At another point of the communication line, a second code processing module is provided, which is dedicated to the second vehicle. The first authentication code generation module is configured to send identification information, authentication information, and/or encryption keys. The second code processing module is configured to process and send back identification information, authentication information, and/or encryption keys, especially processed and/or modified identification information, authentication information, encryption keys.

The present invention relates to an electronic parking brake device for a vehicle, in particular a utility vehicle. As a function of at least one operating state of a towing vehicle parking brake supply line and/or a trailer parking brake supply line, a towing vehicle parking brake control valve is activatable by a control unit in such a way that a towing vehicle parking brake supply line can be deaerated or aerated by the towing vehicle parking brake control valve. By manually actuating a trailer parking brake control element, a trailer parking brake control valve is activatable by the control unit in such a way that a trailer parking brake supply line can be deaerated or aerated by the trailer parking brake control valve. The present invention also relates to a method for operating the above electronic parking brake device for a vehicle.

An electronically controllable pneumatic brake system in a vehicle includes wheel brakes for braking respective wheels of the vehicle. Wheel brakes of at least one vehicle axle include spring-loaded cylinders for implementing a pneumatic parking brake in a parking brake braking circuit of the vehicle. The brake system further includes an electronically controllable monostable bypass valve, wherein the monostable bypass valve is disposed between a manually operated parking brake valve and the spring-loaded cylinders. The monostable bypass valve controls, in a first switching position, a bypass control pressure based on an actuation pressure produced by the parking brake valve to implement a manually specified parking brake force. The monostable bypass valve further controls, in a second switching position, a bypass control pressure depending on a venting pressure prevailing in a bypass vent connection to implement an electrically specified parking brake force.

An electropneumatic valve assembly is for activating a parking brake function of an electropneumatic brake system. The valve assembly has a pilot control unit and a main valve unit configured to actuate a parking brake pressure at least at one spring-accumulator connection. The valve assembly has a service brake connection for receiving a service brake pressure and a safety valve. The safety valve, by receiving a safety control pressure, is switchable from a venting position, in which the safety valve connects the pilot control unit to a vent, to a supply position, in which the safety valve supplies the pilot control valve with reservoir pressure, the safety valve remaining in the supply position or switching to the venting position as a function of an actuated pressure. The service brake connection is connected to the safety valve control connection.

An airbrake retention system and method for controlling air flow within an airbrake system, including the steps of: receiving, with a computer system comprising one or more processors, train control data associated with stopping on a grade; determining, with a computing system comprising one or more processors, an air retention controller within a railcar brake system to control air pressure release based on the train control data; communicating, with a computing system comprising one or more processors, an air control signal, the air control signal comprising information associated with a retainer valve of the braking assembly; and controlling, with a computing system comprising one or more processors, the retainer valve to adjust from a first state to a second state based on the air control signal to control air flow between the reservoir and the air braking assembly.