Disclosed is a valve arrangement for aerating spring accumulator brake cylinders in a trailer vehicle with a pneumatic braking system, the valve arrangement having a first connection for a line connected to a reservoir of the trailer vehicle, a second connection for a line leading to the spring accumulator brake cylinders, and a first pneumatic control input, wherein the first connection can be connected to the second connection depending on the pressure on the first pneumatic control input. The first control input is connected to a line connected to a control connection of the trailer vehicle or to a line connected to the reservoir. A valve unit, a pneumatic braking system, a method of operating the same, and a trailer vehicle including the same are also disclosed.

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 electro-pneumatic tractor protection valve assembly (8) including a trailer supply input (84) for receiving a supply pressure, a trailer service output (87) for delivering a trailer supply pressure, a first supply input (81) for receiving a primary driver brake pressure, a second supply input (82) for receiving a secondary driver brake pressure, a dual brake valve (14) actuated by a brake pedal (10) and supplying the brake control pressures, a vent opening (86) for venting an internal conduit, a first electrically controlled pneumatic valve (92) to receive a first electric control signal for trailer assistance braking, and a trailer control output (85) for delivering a trailer brake control pressure. The valve assembly includes one single casing (8a) accommodating the first supply input (81), the second supply input (82), the trailer supply input (84), the trailer control output (85), the vent opening (86) and the trailer service output (87).

A valve system includes an isolation check valve delivering pneumatic fluid as a supply pressure, a double-check valve adapted to deliver a braking demand control signal of the pneumatic fluid based on a higher of a first braking demand in a first pneumatic braking circuit and a second braking demand in a second pneumatic braking circuit, and a control module. The control module is adapted to receive the supply pressure as a control module supply pressure of the pneumatic fluid, receive a control module control pressure of the pneumatic fluid based on the braking demand control signal, and deliver a control module delivery pressure of the pneumatic fluid based on the control module supply pressure and the control module control pressure. A park control module selectively transmits the pneumatic fluid at the supply pressure based on a park brake control signal.

An electro-pneumatic tractor protection valve assembly (8) including a trailer supply input (84) for receiving a supply pressure, a trailer service output (87) for delivering a trailer supply pressure, a first supply input (81) for receiving a primary driver brake pressure, a second supply input (82) for receiving a secondary driver brake pressure, a dual brake valve (14) actuated by a brake pedal (10) and supplying the brake control pressures, a vent opening (86) for venting an internal conduit, a first electrically controlled pneumatic valve (92) to receive a first electric control signal for trailer assistance braking, and a trailer control output (85) for delivering a trailer brake control pressure. The valve assembly includes one single casing (8a) accommodating the first supply input (81), the second supply input (82), the trailer supply input (84), the trailer control output (85), the vent opening (86) and the trailer service output (87).

A valve system includes an isolation check valve delivering pneumatic fluid as a supply pressure, a double-check valve adapted to deliver a braking demand control signal of the pneumatic fluid based on a higher of a first braking demand in a first pneumatic braking circuit and a second braking demand in a second pneumatic braking circuit, and a control module. The control module is adapted to receive the supply pressure as a control module supply pressure of the pneumatic fluid, receive a control module control pressure of the pneumatic fluid based on the braking demand control signal, and deliver a control module delivery pressure of the pneumatic fluid based on the control module supply pressure and the control module control pressure. A park control module selectively transmits the pneumatic fluid at the supply pressure based on a park brake control signal.

A valve system includes a control module on a tractor portion of a vehicle adapted to receive a supply pressure as a control module supply pressure of the pneumatic fluid, receive a control module control pressure of the pneumatic fluid, and deliver a control module delivery pressure of the pneumatic fluid based on the control module supply pressure and the control module control pressure. A park control module selectively transmits the pneumatic fluid at the supply pressure based on a park brake control signal. A supply glad-hand fluidly communicates the selectively transmitted supply pressure of the pneumatic fluid to supply a brake on an associated trailer portion of the vehicle. A control glad-hand fluidly communicates the control module delivery pressure of the pneumatic fluid to control the brake on the associated trailer portion of the vehicle. An exhaust valve, which fluidly communicates with both the selectively transmitted supply pressure and the control module delivery pressure, exhausts the control module delivery pressure of the pneumatic fluid from the control glad-hand.

Disclosed is a valve arrangement for aerating spring accumulator brake cylinders in a trailer vehicle with a pneumatic braking system, the valve arrangement having a first connection for a line connected to a reservoir of the trailer vehicle, a second connection for a line leading to the spring accumulator brake cylinders, and a first pneumatic control input, wherein the first connection can be connected to the second connection depending on the pressure on the first pneumatic control input. The first control input is connected to a line connected to a control connection of the trailer vehicle or to a line connected to the reservoir. A valve unit, a pneumatic braking system, a method of operating the same, and a trailer vehicle including the same are also disclosed.

A trailer control module for a brake device, more particularly an electronic parking brake device, for a commercial vehicle, includes at least one control piston and at least one housing, in which the control piston is accommodated. The housing has at least one control connection point and at least one feedback connection point for controlling the control piston. The housing also has at least one supply connection point, which is connected to at least one supply line for supplying pressure fluid to the trailer control module. The control piston can be controlled bistably by the control connection point and by the feedback connection point. A parking brake device, more particularly an electronic parking brake device, for a vehicle, includes at least one such trailer control module.

When a brake of a tractor is released, a control unit having a computer built therein monitors the pressure of working fluid output from a trailer control valve that controls a brake of the trailer in conjunction with the brake of the tractor. When time required for a pressure of the working fluid to decrease to a predetermined pressure is a predetermined time or longer, the control unit determines that the trailer is coupled with the tractor. When the time is less than the predetermined time, the control unit determines that the trailer is not coupled with the tractor.