Compressed air supply system

Patent metadata

Field	Value
Publication number	US-10703164-B2
Application number	US-201716081922-A
Country	US
Kind code	B2
Filing date	Feb 6, 2017
Priority date	Mar 30, 2016
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A compressed-air feed system for operating a pneumatic system includes a compressed-air supply, a compressed-air connection to the pneumatic system, a ventilation connection to surroundings, and a pneumatic main line between the compressed-air supply and the compressed-air connection. The pneumatic main line has an air dryer and a regeneration throttle. The compressed-air feed system further includes a ventilation line between the pneumatic main line and the ventilation connection. The ventilation line has a ventilation valve and a ventilation throttle. The compressed-air feed system further includes a bypass line between the compressed-air connection and the air dryer. The bypass line has a bypass valve formed as a 2/2 directional valve configured to permit an air flow conducted via the air dryer, and bypassing the regeneration throttle, for filling and ventilating the pneumatic system.

First claim

The invention claimed is:

1. A compressed-air feed system for operating a pneumatic system, the compressed-air feed system comprising:
a compressed-air supply;
a compressed-air connection to the pneumatic system;
a ventilation connection to surroundings;
a pneumatic main line between the compressed-air supply and the compressed-air connection, the pneumatic main line having an air dryer and a regeneration throttle;
a ventilation line between the pneumatic main line and the ventilation connection, the ventilation line having a ventilation valve and a ventilation throttle;
a bypass line between the compressed-air connection and the air dryer, the bypass line having a bypass valve formed as a 2/2 directional valve configured to permit an air flow conducted via the air dryer, and bypassing the regeneration throttle, for filling and ventilating the pneumatic system.

2. The compressed-air feed system as claimed in claim 1 , wherein the bypass line is connected via a first and a second connection points to the pneumatic main line, wherein the first connection point is arranged between the air dryer and the regeneration throttle, and wherein the second connection point is arranged between the regeneration throttle and the compressed-air connection.

3. The compressed-air feed system as claimed in claim 1 , wherein the ventilation valve has a check valve, and/or wherein the bypass valve has a check valve.

4. The compressed-air feed system as claimed in claim 1 , wherein the bypass line permits a larger minimum flow cross section of a throughflowing compressed-air flow than the regeneration throttle.

5. The compressed-air feed system as claimed in claim 1 , in which the ventilation line permits a larger minimum flow cross section of a throughflowing compressed-air flow than a cross section of the bypass line.

6. The compressed-air feed system as claimed in claim 1 , further comprising a compressed-air reservoir as part of a pneumatic system which is connected via a filling valve to the pneumatic main line and which is configured to, in a boost mode of the compressed-air feed system, fill the pneumatic system with compressed air via the filling valve and the pneumatic main line.

7. The compressed-air feed system as claimed in claim 1 , further comprising a two-stage compressor connected both to the air supply and to the pneumatic main line and which is configured to, in a corresponding filling operating mode of the compressed-air feed system, fill the pneumatic system with compressed air.

8. The compressed-air feed system as claimed in claim 1 , wherein the pneumatic main line has a check valve.

9. The compressed-air feed system as claimed in claim 6 , configured to provide a first filling operating mode in which the bypass valve and the filling valve are at least temporarily simultaneously open, such that the pneumatic system can, over a predetermined time period of a filling process, be filled by an air flow from the compressed-air reservoir, which flow is, in part, limited not by the regeneration throttle but by a minimum flow cross section of the bypass line.

10. The compressed-air feed system as claimed in claim 9 , configured to provide a second ventilation operating mode in which the ventilation valve and the bypass valve are simultaneously open, such that the pneumatic system can, over an entire time period of a ventilation process, be ventilated via the ventilation line by an air flow which is, in part, limited not by the regeneration throttle but by a minimum flow cross section of the bypass line.

11. The compressed-air feed system as claimed in claim 10 , wherein the second and/or another ventilation operating mode are provided such that the first ventilation valve is opened at a time t 1 and that the bypass valve is opened at a time t 2 , and wherein the time t 1 precedes the time t 2 .

12. The compressed-air feed system as claimed in claim 10 , wherein the second and/or another ventilation operating mode are provided such that the first ventilation valve is closed at a time t 3 and that the bypass valve is closed at a time t 4 , and wherein the time t 3 follows the time t 4 .

13. A pneumatic system including the compressed-air feed system as claimed in claim 1 , and further including a pneumatic system formed as an air suspension system having a gallery and at least one first branch line, which is pneumatically connected to the gallery and which has a bellows, and/or a second branch line, which is pneumatically connected to the gallery and which has a compressed-air reservoir, and having a first directional valve connected upstream of the bellows and/or a second directional valve connected upstream of the compressed-air reservoir.

14. A method for operating a compressed-air feed system, and/or a pneumatic system, the method comprising:
filling a pneumatic system by a compressed-air flow, conducted via a pneumatic main line and via an air dryer, from the compressed-air feed system via a main line valve arranged in the pneumatic main line and/or via a bypass valve, the pneumatic main line having the air dryer and a regeneration throttle;
maintaining a pressure in the pneumatic system, wherein the pneumatic main line is shut off, by a first ventilation valve and the bypass valve, for prevention of a flow of compressed air out of the pneumatic system, the ventilation valve disposed in a ventilation line between the pneumatic main line and a ventilation connection, and
ventilating the pneumatic system by the compressed-air flow, conducted via the pneumatic main line and via the air dryer, from the pneumatic system via a ventilation valve connected to a ventilation throttle or via the first ventilation valve and a bypass valve.

15. The method as claimed in claim 14 , wherein the filling takes place, in a first filling operating mode, via a main line valve in the pneumatic main line and via the bypass valve simultaneously, wherein the bypass valve and a filling valve, via which a compressed-air reservoir is connected to the pneumatic main line, are open simultaneously, such that the pneumatic system is, over a predetermined time period of a filling process, filled via the regeneration throttle and via the bypass line.

16. The method as claimed in claim 14 , in which the ventilation in a second ventilation operating mode takes place via the regeneration throttle and the bypass valve simultaneously, wherein the ventilation valve and the bypass valve are open simultaneously, such that the pneumatic system is, over an entire time period of a ventilation process, ventilated via the ventilation throttle and via the bypass line.

17. The method as claimed in claim 14 , in which a humidity of air within the pneumatic system is reduced by repeated ventilation and filling of the pneumatic system with the bypass valve closed.

18. A device configured to perform the method as claimed in claim 14 for open-loop and/or closed-loop control of a compressed-air feed system and/or of a pneumatic system.

Assignees

• Wabco Europe Bvba

Inventors

• Meier Joerg
• Stabenow Uwe
• Stuenkel Christoph

Classifications

• B60G17/056 Primary

  Regulating distributors or valves {for hydropneumatic systems}(B60G17/044 - B60G17/048, {B60G17/0416} take precedence; {Fluid interconnection systems to control vehicle inclination B60G21/06, B60G21/10}; valves per se F16K) · CPC title

• B60G2500/30

  Height or ground clearance · CPC title

• B60G2500/302

  using distributor valves · CPC title

• B60G17/0565 Primary

  Height adjusting valves · CPC title

• B60G2500/2021

  Arrangement of valves · CPC title