Abstract: 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.

Abstract: A power brake system (1.1) of a vehicle (2) has a pressure medium source (14) and a pressure-medium-operated primary brake system (30) operable as a service brake and steering brake system. The primary brake system has at least one foot brake valve (36a, 36b) and two wheel brake cylinders (40a, 40b) arranged on both sides on a drive axle (8) and operable independently of one another. A pressure-medium-operated secondary brake system (50), operable independently of the primary brake system (30), has a brake control valve (56) and at least one brake cylinder (62a, 62b. The secondary brake system (50) is electronically controllable and has a brake control valve (56) configured as a solenoid valve. The braking force of the at least one brake cylinder (62a, 62b) can be set by feeding or removing pressure medium to or from the latter via the brake control valve (56).

Abstract: A method is disclosed for controlling a change in the direction of travel of a working vehicle between forward travel and rearward travel or vice versa. The working vehicle has an electronically controllable hydrostatic travel drive, a power-operated brake system with at least one electronically controllable brake circuit, and an electronic brake-control unit for controlling the travel drive and the brake circuit. While the vehicle is traveling in a first direction, a change in the direction of travel is triggered by a switchover of the hydrostatic travel drive by means of an assigned manual operating element. To reduce the mechanical loading, the deceleration of the working vehicle can be assisted by automatically actuating the brakes of the electronically controllable brake circuit, where these brakes are actuated by being triggered by the switchover of the operating element and are released by the time the vehicle comes to a standstill.

Abstract: A trailer control module (94) of a pressure-medium operated braking system of a tow vehicle has a valve assembly for controlling a pneumatic braking system of a trailer vehicle The valve assembly includes the following: an electronically controlled trailer control valve (6) which contains a pneumatically controlled relay valve (18) with an inverted control input (34); a pressure-medium controlled backup valve (8) which contains a pressure-medium controlled relay valve (54); and at least one electronically controlled parking brake valve (68, 70), via which the relay valve (18) of the trailer control valve (6) can be actuated pneumatically at its inverted control input (34). In addition, a coupling device (98) is present, by which the parking brakes of the tow vehicle can also be operated via the parking brake valve (68, 70).

Abstract: A valve arrangement (2a, 2b) of a hydraulically braked tractor vehicle for controlling the brake pressure of a pneumatically braked trailer includes an electronically controlled trailer control valve (6) with an inlet valve (14), an outlet valve (16), a pneumatical relay valve (18), a breakaway valve (20) and a brake control pressure sensor (24). The valve arrangement also has a hydraulically controlled backup valve (8) with a hydraulically activated relay valve (46), a redundancy valve (112, 112?) and a hydraulic control pressure sensor (50). Output-side brake control lines (40; 62) are connected via a shuttle valve (10) to a brake coupling head (82). The valves (14, 16, 18, 20) and the pressure sensors (24, 50) of the trailer control valve (6), the valves (46, 112, 112?) of the backup valve (8) and the shuttle valve (10) may be combined in one trailer control module (98) with a single housing (100).

Abstract: A power brake system (1.1) of a vehicle (2) has a pressure medium source (14) and a pressure-medium-operated primary brake system (30) operable as a service brake and steering brake system. The primary brake system has at least one foot brake valve (36a, 36b) and two wheel brake cylinders (40a, 40b) arranged on both sides on a drive axle (8) and operable independently of one another. A pressure-medium-operated secondary brake system (50), operable independently of the primary brake system (30), has a brake control valve (56) and at least one brake cylinder (62a, 62b. The secondary brake system (50) is electronically controllable and has a brake control valve (56) configured as a solenoid valve. The braking force of the at least one brake cylinder (62a, 62b) can be set by feeding or removing pressure medium to or from the latter via the brake control valve (56).

Abstract: 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.

Abstract: A trailer control module (94) of a pressure-medium operated braking system of a tow vehicle has a valve assembly for controlling a pneumatic braking system of a trailer vehicle The valve assembly includes the following: an electronically controlled trailer control valve (6) which contains a pneumatically controlled relay valve (18) with an inverted control input (34); a pressure-medium controlled backup valve (8) which contains a pressure-medium controlled relay valve (54); and at least one electronically controlled parking brake valve (68, 70), via which the relay valve (18) of the trailer control valve (6) can be actuated pneumatically at its inverted control input (34). In addition, a coupling device (98) is present, by which the parking brakes of the tow vehicle can also be operated via the parking brake valve (68, 70).

Abstract: A tire pressure regulating system is disclosed for adjusting tire pressures of pneumatic tires of vehicle wheels of a plurality of vehicle axles of a motor vehicle while driving. The tire pressure regulating system comprises: at least one switchover valve, an axle valve, a wheel valve and a valve. A motor vehicle comprising the tire pressure regulating system is also disclosed.

Abstract: A tire pressure control device (1) of an off-road vehicle is configured for changing tire pressures of vehicle wheels (2a, 2b, 3a, 3b) of at least one vehicle axle (2, 3). Each pneumatic tire has a pressure-controlled wheel valve (4a, 4b, 5a, 5b) which is pneumatically connected to a control pressure line (S1, S2) and to a supply pressure line (V1, V2). The control pressure lines (S1, S2) and the supply pressure lines (V1, V2) are configured to be pneumatically connected to a compressed air supply device (6) and to be controlled by an electronic control unit (10) The actuation of the wheel valves (4a, 4b, 5a, 5b) takes place axle by axle via control valves (15, 16), and the compressed air supply of the vehicle wheels (2a, 2b, 3a, 3b) is carried out by side via supply valves (11, 12).

Abstract: A power-operated hydraulic brake system for a wheeled vehicle includes a main brake line; a brake valve configured to input a target brake pressure into the main brake line, the brake vale configured to be actuated via a brake pedal; a plurality of wheel brake lines branching off from the brake valve, each of which leads to an actuating unit of a wheel brake; and a valve assembly of an ABS control system. The valve assembly includes an inlet valve arranged between the main brake line and one of the wheel brake lines, and an outlet valve arranged between the relevant wheel brake line and an unpressurized return line. The inlet valve and the outlet valve are pressure-controlled 2/2-way switching valves with correspondingly large switching cross sections, and the inlet valve and the outlet valve are each assigned at least one pilot valve designed as a solenoid switching valve.

Abstract: A hydraulic power brake system (1) of a wheeled vehicle or for a vehicle unit has a main brake line (20, 21), in which a setpoint brake pressure can be controlled via a brake valve (4) that is operated via a brake pedal (7), and from which an axle brake line or a wheel brake line (46, 49, 50) branches off. Inlet valves and outlet valves and a pilot control valve of the ABS control system for the vehicle unit or for each vehicle axle are respectively disposed together in an ABS modulator block (69), which also includes a temperature sensor (70, 71, 72) for detecting the oil temperature (T) and a heating element (73, 74, 75) for locally heating the hydraulic oil are disposed in each ABS modulator block (69).

Abstract: A valve arrangement (2) of a hydraulically braked tractor vehicle for controlling the brake pressure of a pneumatically braked trailer includes an electronically controlled trailer control valve (6) with an inlet valve (14), an outlet valve (16), a pneumatical relay valve (18), a breakaway valve (20) and a brake control pressure sensor (24). The valve arrangement also has a hydraulically controlled backup valve (8) with a hydraulically activated relay valve (46), a redundancy valve (48) and a hydraulic control pressure sensor (50). Output-side brake control lines (40, 76; 62, 78) are connected via a shuttle valve (10) to a brake coupling head (82). The valves (14, 16, 18, 20) and the pressure sensors (24, 50) of the trailer control valve (6), the valves (46, 48) of the backup valve (8,) and the shuttle valve (10) may be combined in one trailer control module (98) with a single housing (100).

Abstract: An electrohydraulic brake system of an off-road vehicle includes a first hydraulic brake circuit for a first vehicle axle; a second hydraulic brake circuit for at least one second vehicle axle; a respective wheel brake for each vehicle wheel per vehicle axle; an electronic control unit having a brake force distribution function; a brake signal generator; at least one central brake force distribution valve per brake circuit, a signal input of the control unit for registering a braking signal of the brake signal generator; and at least one signal output of the control unit per brake force distribution valve. A brake pressure for applying a hydraulic pressure fluid to the brake cylinders of the wheel brakes on the respective vehicle axles can be fed to the respective brake circuit by the control unit in conjunction with the central brake force distribution valve and the brake signal generator.

Abstract: A tire pressure regulating device for adjusting, while driving, the tire pressures of vehicle wheels of a plurality of vehicle axles of a motor vehicle with pneumatic tires includes at least one switchover valve arranged on the vehicle chassis that can be controlled in an electromagnetic/pneumatic manner, a plurality of axle valves, each axle valve being arranged on the vehicle chassis for each vehicle axle and being controllable in an electromagnetic/pneumatic manner, a plurality of pressure-controlled wheel valves, each pressure-controlled wheel valve being arranged at a respective vehicle wheel, a pilot control valve arranged on the vehicle chassis and being controllable in a purely electromagnetic manner or in an electromagnetic/pneumatic manner, and a plurality of two-channel rotary couplings arranged between the vehicle axles and associated vehicle wheels and provided with switchable seals.

Abstract: A hydraulic power brake system (1) of a wheeled vehicle or for a vehicle unit has a main brake line (20, 21), in which a setpoint brake pressure can be controlled via a brake valve (4) that is operated via a brake pedal (7), and from which an axle brake line or a wheel brake line (46, 49, 50) branches off. Inlet valves and outlet valves and a pilot control valve of the ABS control system for the vehicle unit or for each vehicle axle are respectively disposed together in an ABS modulator block (69), which also includes a temperature sensor (70, 71, 72) for detecting the oil temperature (T) and a heating element (73, 74, 75) for locally heating the hydraulic oil are disposed in each ABS modulator block (69).

Abstract: A power-operated hydraulic brake system for a wheeled vehicle includes a main brake line; a brake valve configured to input a target brake pressure into the main brake line, the brake vale configured to be actuated via a brake pedal; a plurality of wheel brake lines branching off from the brake valve, each of which leads to an actuating unit of a wheel brake; and a valve assembly of an ABS control system. The valve assembly includes an inlet valve arranged between the main brake line and one of the wheel brake lines, and an outlet valve arranged between the relevant wheel brake line and an unpressurized return line. The inlet valve and the outlet valve are pressure-controlled 2/2-way switching valves with correspondingly large switching cross sections, and the inlet valve and the outlet valve are each assigned at least one pilot valve designed as a solenoid switching valve.

Abstract: A tire pressure regulating system is disclosed for adjusting tire pressures of pneumatic tires of vehicle wheels of a plurality of vehicle axles of a motor vehicle while driving. The tire pressure regulating system comprises: at least one switchover valve, an axle valve, a wheel valve and a valve. A motor vehicle comprising the tire pressure regulating system is also disclosed.

Abstract: A tyre pressure regulating device for adjusting, while driving, the tyre pressures of vehicle wheels of a plurality of vehicle axles of a motor vehicle with pneumatic tyres includes at least one switchover valve arranged on the vehicle chassis that can be controlled in an electromagnetic/pneumatic manner, a plurality of axle valves, each axle valve being arranged on the vehicle chassis for each vehicle axle and being controllable in an electromagnetic/pneumatic manner, a plurality of pressure-controlled wheel valves, each pressure-controlled wheel valve being arranged at a respective vehicle wheel, a pilot control valve arranged on the vehicle chassis and being controllable in a purely electromagnetic manner or in an electromagnetic/pneumatic manner, and a plurality of two-channel rotary couplings arranged between the vehicle axles and associated vehicle wheels and provided with switchable seals.

Abstract: A leveling valve for discharging and supplying air from and to a plurality of utilization elements comprises a valve disc arrangement configured to direct air between a source of pressurized air, an exhaust port, and the utilization elements. The valve disc arrangement comprises a first and a second valve disc, which are rotatable with respect to each other such that the valve is switchable between multiple switching positions, and, in some switching positions, either the source of pressurized air or the exhaust port are in fluid communication with the utilization elements. The valve discs provide a stepped increase in flow cross-section in a respective flow path to or from the utilization elements. The stepped increase is dependent on the angle of rotation between the valve discs.