A valve unit (1, 1′) for modulating the pressure in a pneumatic brake system, has a brake pressure inlet (3), a brake pressure outlet (4) and a venting outlet (5), a pneumatically controllable main valve (6, 7) and a pilot valve (8, 9), embodied as a solenoid valve and assigned to the main valve (6, 7), which are arranged in a valve housing (2, 2′) subdivided by a plane of division (10), into a main housing (11, 11′) and a housing cover (12). Forfixing the housing cover (12) on the main housing (11, 11′) a bracket element (62.1) is fixed to the main housing (11, 11′) and bears with a largely planar pressure plate (63) generating an elastic prestressing force on a planar outside wall (64) of the housing cover (12) oriented parallel to the plane of division (10) of the valve housing (2, 2′).

The invention concerns a valve unit (1) for modulating pressure in a compressed air braking system, with a brake pressure input (3), a brake pressure output (4), and a purge output (5), an inlet valve (6) configured as a diaphragm valve, an outlet valve (7) configured as a diaphragm valve, and with, for each diaphragm valve (6, 7), respective precontrol valves (8, 9), which are each configured as a 3/2-way solenoid valve and are arranged in an elongate valve housing (2), which is divided by a division plane (10) that is largely horizontal in the installation position into a base housing (11) and a housing cover (12).

For effective sound damping of the compressed air emerging into the environment when the outlet valve (7) is open, the valve unit (1) at the purge output (5) is provided with a silencer (75) which comprises a largely cylindrical silencer housing (76) with an inlet opening (77), a calming chamber (78) arranged radially on the inside, a large outlet opening (79) and a silencer insert (80.1) arranged upstream of the outlet opening (79) inside the silencer housing (76) and made of an air-permeable and sound-deadening material, and which (75) is attached to the base housing (11) with base walls (83, 84) oriented parallel to the division plane (10) between the brake pressure input (3) and the brake pressure output (4).

A method is disclosed for controlling brake forces of a working machine, the working machine including a frame and two front wheels and two rear wheels mounted to the frame, the working machine further including a front wheel brake arranged to brake at least one of the front wheels, and a rear wheel brake arranged to brake at least one of the rear wheels, the front wheel brake being controllable independently of the rear wheel brake, and vice versa, the working machine further including an implement connected to the frame so as to be movable in relation to the frame. The method includes determining a position of the implement in relation to the frame, and distributing the brake forces between the front and rear wheel brakes at least partly based on the determined implement position.

A method is disclosed for controlling brake forces of a working machine, the working machine including a frame and two front wheels and two rear wheels mounted to the frame, the working machine further including a front wheel brake arranged to brake at least one of the front wheels, and a rear wheel brake arranged to brake at least one of the rear wheels, the front wheel brake being controllable independently of the rear wheel brake, and vice versa, the working machine further including an implement connected to the frame so as to be movable in relation to the frame. The method includes determining a position of the implement in relation to the frame, and distributing the brake forces between the front and rear wheel brakes at least partly based on the determined implement position.

An ABS pressure control valve assembly for controlling the fluid pressure in a pressure-medium-operated brake system of a vehicle having brake slip control, by which the brake pressure in pressure-medium-operated brake actuators is adaptively adjusted for a locking tendency of individual wheels of the vehicle. Two membranes of two membrane valves are clamped between two housing parts and an intermediate plate. Also described are a pressure-medium-operated brake system of a vehicle with brake-slip control, including at least one such ABS pressure control valve assembly, and to a method for producing such an ABS pressure control valve assembly.

A valve assembly for providing pressure control at an output port, including: an input port and the output port; a pressure sink; a first valve with a first control connection; a second valve with a second control connection, in which the first valve and the second valve are arranged in series between the input port and the pressure sink and between which the output port branches off; a first control valve to connect the first control connection to the input port or vents the first control connection in a controllable manner; and a second control valve to connect the first control connection to the output port or vents the first control connection in a controllable manner. Also described are a related anti-lock braking system, a commercial vehicle, and a method.

A valve assembly for providing pressure control at an output port, including: an input port and the output port; a pressure sink; a first valve with a first control connection; a second valve with a second control connection, in which the first valve and the second valve are arranged in series between the input port and the pressure sink and between which the output port branches off; a first control valve to connect the first control connection to the input port or vents the first control connection in a controllable manner; and a second control valve to connect the first control connection to the output port or vents the first control connection in a controllable manner. Also described are a related anti-lock braking system, a commercial vehicle, and a method.

A hydraulic unit, in particular a hydraulic unit for a slip-controllable vehicle brake system, includes a housing block, a pump, and a damping device. The pump has an intake side and a delivery side. The housing block has a pump receptacle that holds the pump, a first fluid duct that intersects the pump receptacle in a region of the delivery side of the pump, and a second fluid duct opening into the pump receptacle in the region of the delivery side of the pump, and a first separation point that seals off the first fluid duct from the second fluid duct. The damping device damps pulsations and reduces operating noise of the hydraulic unit without (i) having a detrimental effect on functional characteristics of the unit, in particular on pressure build-up dynamics of the vehicle brake system, or without (ii) jeopardizing a compact construction of the hydraulic 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 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.