초록 ▼

An electropneumatic brake control device for controlling an air-quantity-boosting valve device which controls a parking brake of a vehicle. A valve unit is provided that has a vent valve for venting a control input of the air-quantity-boosting valve device. The vent valve has three states. In a firs

An electropneumatic brake control device for controlling an air-quantity-boosting valve device which controls a parking brake of a vehicle. A valve unit is provided that has a vent valve for venting a control input of the air-quantity-boosting valve device. The vent valve has three states. In a first state, the control input of the air-quantity-boosting valve device can be vented in a throttled manner by using an aperture. In a second state, the control input of the air-quantity-boosting valve device cannot be vented. In a third state, the control input of the air-quantity-boosting valve device can finally be vented in an unthrottled manner.

대표청구항 ▼

1. A valve unit for an electropneumatic brake control device for controlling an air-flow-boosting valve device for controlling a parking brake of a vehicle, the valve unit comprising a vent valve for venting a control input of said air-flow-boosting valve device, said vent valve having a first opera

1. A valve unit for an electropneumatic brake control device for controlling an air-flow-boosting valve device for controlling a parking brake of a vehicle, the valve unit comprising a vent valve for venting a control input of said air-flow-boosting valve device, said vent valve having a first operating state wherein said control input of said air-flow-boosting valve device can be vented in throttled manner via an orifice and at least one duct, said orifice and said at least one duct being configured to place a first outlet of said vent valve in pneumatic communication with a port of said valve device, a second operating state wherein said control input of said air-flow-boosting valve device cannot be vented, and a third operating state wherein said control input of said air-flow-boosting valve device can be vented in unthrottled manner via a vent device other than said orifice. 2. The valve unit according to claim 1, wherein said vent valve is a double-armature solenoid valve having a primary magnet armature and a secondary magnet armature disposed in a common armature-guide housing and each loaded with a spring, said solenoid valve being actuatable by a solenoid for said primary and said secondary magnet armatures. 3. The valve unit according to claim 2, wherein said double-armature solenoid valve has (i) an inlet associated with said secondary magnet armature that can be placed in communication with said control input of said air-flow-boosting valve device, (ii) a first outlet associated with said primary magnet armature that can be placed in throttled communication with a venting device via said orifice, and (iii) a second outlet associated with said secondary magnet armature that can be placed in unthrottled communication with said venting device. 4. The valve unit according to claim 3, wherein: a) when said solenoid is de-energized, said primary magnet armature and said secondary magnet armature are in spring-loaded home positions, said vent valve occupying said first operating state whereby said inlet is in communication with said first outlet and shut off from said second outlet,b) by injection of a first solenoid current of predefined intensity flowing through said solenoid, said primary magnet armature is displaceable to a switching position determined by the magnetic force, and said secondary magnet armature is disposed in spring-loaded home position, said vent valve occupying said second operating state whereby said inlet is shut off from said first outlet and said second outlet, andc) by injection of a second solenoid current of predefined intensity flowing through said solenoid, said second solenoid current being greater than said first solenoid current, both said primary armature and said secondary armature are displaced to switching positions determined by the magnetic force, said vent valve occupying said third operating state whereby said inlet is in communication with said second outlet and is shut off from said first outlet. 5. The valve unit according to claim 3, wherein: a) when said solenoid is de-energized, said primary magnet armature and said secondary magnet armature are in spring-loaded home positions, said vent valve occupying said first operating state whereby said inlet is in communication with said first outlet and shut off from said second outlet,b) by injection of a first solenoid current of predefined intensity flowing through said solenoid, said primary magnet armature is displaceable to a switching position determined by the magnetic force, and said secondary magnet armature is disposed in spring-loaded home position, said vent valve occupying said third operating state whereby said inlet is in communication with said second outlet and shut off from said first outlet, andc) by injection of a second solenoid current of predefined intensity flowing through said solenoid, said second solenoid current being greater than said first solenoid current, both said primary magnet armature and said secondary magnet armature are displaceable to switching positions determined by the magnetic force, said vent valve occupying said second operating state whereby said inlet is shut off from said first outlet and said second outlet. 6. The valve unit according to claim 3, further comprising an air-admission valve having an inlet and an outlet, wherein: a) said inlet of said air-admission valve is in communication with a first connecting member that can be placed in communication with a compressed-air reservoir,b) said first outlet of said vent valve is in communication via said orifice and said second outlet of said vent valve with a second connecting member that can be placed in communication with said venting device, andc) said outlet of said air-admission valve is in communication with said inlet of said vent valve and with a third connecting member that can be placed in communication with said control input of said air-flow-boosting valve device. 7. The valve unit according to claim 2, wherein said primary magnet armature and said secondary magnet armature have different diameters. 8. The valve unit according to claim 7, wherein said secondary magnet armature has a smaller diameter than said primary magnet armature. 9. The valve unit according to claim 2, wherein said primary magnet armature and said secondary magnet armature are pulled to different depths into said solenoid. 10. The valve unit according to claim 9, wherein said primary magnet armature is pulled more deeply into said solenoid than said secondary magnet armature. 11. The valve unit according to claim 2, wherein the spring force exerted on said primary magnet armature by said spring associated with said primary magnet armature is smaller than the spring force exerted on said secondary magnet armature by said spring associated with said secondary magnet armature. 12. The valve unit according to claim 2, wherein said primary magnet armature and said secondary magnet armature are substantially identical. 13. An electropneumatic brake control device for controlling a vehicle parking brake, comprising pneumatically actuatable brake cylinders for actuation of wheel brakes, at least one of said brake cylinders being a spring-actuated brake cylinder having a spring-actuator part that can actuate said parking brake, at least one valve unit according to claim 1 having a connecting member in communication with a pneumatic control input of an air-flow-boosting valve device, said air-flow-boosting valve device having an inlet in communication with a compressed-air supply line to a compressed-air reservoir and an outlet in communication with a compressed-air line to said spring-actuator part of said spring-actuated brake cylinder, wherein pressure at said outlet of said air-flow-boosting valve device is controllable by control pressure applied at said pneumatic control input. 14. An electrically controlled pneumatic vehicle brake system, comprising a service brake, a brake control device according to claim 11, and a parking brake, said service brake including a brake pedal and pneumatically actuatable brake cylinders, one of said brake cylinders being in communication with said brake pedal, at least one of said brake cylinders being a spring-actuated brake cylinder having a spring-actuator part that can actuate said parking brake, and said parking brake including a parking-brake signal transducer for actuating said parking brake by venting said spring-actuator part of said spring-actuated brake cylinder. 15. A vehicle comprising an electrically controlled pneumatic vehicle brake system according to claim 14. 16. The brake control device according to claim 13, wherein said air-flow-boosting valve device is a relay valve having a relay piston with an opening by which an outlet of said relay valve is placed in throttled communication with a control input of said relay valve. 17. The brake control device according to claim 16, wherein said opening has a larger cross-sectional area than the cross-sectional area of an orifice of said valve unit. 18. The brake control device of claim 13, wherein said connecting member of said at least one valve unit is in direct communication with said pneumatic control input of said air-flow-boosting valve device.