Pneumatic circuit for passenger car pneumatic suspension system

Patent metadata

Field	Value
Publication number	US-10343479-B2
Application number	US-201515505251-A
Country	US
Kind code	B2
Filing date	Aug 21, 2015
Priority date	Aug 22, 2014
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A compressed air supply installation for the operation of a pneumatic system includes a compressed air feed, a compressed air connection to a pneumatic unit, a venting connection, a main pneumatic line disposed between the compressed air feed and the compressed air connection, and a first venting line disposed between the compressed air connection and the venting connection, the first venting line including a venting valve including a first venting valve connection, a second venting valve connection, and a control connection pneumatically connected to a control valve by a pneumatic control relay line. The venting valve is closed between the first venting valve connection and the second venting valve connection to the venting connection in a first switching state of the venting valve and is opened between the first venting valve connection and the second venting valve connection to the venting connection in a second switching state.

First claim

The invention claimed is:

1. A compressed air supply installation for the operation of a pneumatic system, the compressed air supply installation comprising:
a compressed air feed;
a compressed air connection to a pneumatic unit;
a venting connection;
a main pneumatic line disposed between the compressed air feed and the compressed air connection; and
a first venting line disposed between the compressed air connection and the venting connection, the first venting line including a venting valve comprising a first venting valve connection, a second venting valve connection, and a control connection pneumatically connected to a control valve by a pneumatic control relay line,
wherein the venting valve is closed between the first venting valve connection and the second venting valve connection to the venting connection in a first switching state of the venting valve and is opened between the first venting valve connection and the second venting valve connection to the venting connection in a second switching state of the venting valve,
wherein the control valve is closed between a control pressure input connection and a control pressure output connection to the control connection in a first switching state of the control valve and is opened between the control pressure input connection and the control pressure output connection to the control connection in a second switching state of the of the control valve in order to subject the control connection of the venting valve to pressure and to shift the venting valve from the first or second switching state of the venting valve into second or first switching state of the venting valve,
wherein the control valve is a 2/2-way directional control valve, and
wherein the pneumatic control relay line is connected to the venting connection by an additional venting line in at least one of the first or second switching state of the venting valve.

2. The compressed air supply installation as claimed in claim 1 , wherein a restrictor is arranged in the additional venting line.

3. The compressed air supply installation as claimed in claim 1 , wherein the restrictor has a diameter of less than/equal to 1 mm.

4. The compressed air supply installation as claimed in claim 1 , wherein the additional venting line is pneumatically connected to a portion of the first venting line between the second venting valve connection and the venting connection and/or to the further venting connection.

5. The compressed air supply installation as claimed in claim 1 , wherein the additional venting line is connected to the venting connection and/or to the further venting connection regardless of the switching state of the venting valve.

6. The compressed air supply installation as claimed in claim 1 , wherein the pneumatic control relay line is a relay piston control line for a relay piston of the venting valve.

7. The compressed air supply installation as claimed in claim 6 , wherein the additional venting line is formed as an opening in the relay piston or in the venting valve housing of the venting valve.

8. The compressed air supply installation as claimed in claim 7 , wherein the opening in the relay piston is formed as a bore in the relay piston.

9. The compressed air supply installation as claimed in claim 7 , further comprising a seal that seals off and closes the opening in the relay piston in the first or second switching state of the venting valve.

10. The compressed air supply installation as claimed in claim 7 , wherein the opening in the relay piston is formed as an aperture in the venting valve housing of the venting valve, wherein the aperture is formed over a partial range of the valve lift of the relay piston of the venting valve.

11. The compressed air supply installation as claimed in claim 1 , wherein the control valve is a solenoid control valve.

12. The compressed air supply installation as claimed in claim 11 , wherein the first switching state of the control valve is an unenergized switching state and the second switching state of the control valve is an energized switching state.

13. The compressed air supply installation as claimed in claim 1 , wherein the additional venting line is a feedback line, wherein the feedback line connects to the pneumatic control relay line and a second control connection of the venting valve.

14. The compressed air supply installation as claimed in claim 13 , wherein in the case of a venting connection of the venting valve, yet a second additional venting line is connected, the second additional venting line being pneumatically connected to the venting connection.

15. The compressed air supply installation as claimed in claim 13 , wherein the second control connection is designed for receiving a second control pressure fraction, which acts in addition to a first control pressure fraction of the first control connection.

16. The compressed air supply installation as claimed in claim 13 , wherein the second control connection is embodied as a counter-control connection, which is designed to receive a second control pressure fraction, which acts in addition to a first control pressure fraction of the first control connection and for a limited time and in the opposite direction to a first control pressure fraction of the first control connection.

17. The compressed air supply installation as claimed in claim 13 , wherein the additional venting line is pneumatically connected as a feedback line to a venting rear space of the venting valve and to the venting connection, and wherein the second additional venting line connects by yet a further second venting branch connection to the first venting line 70 .

18. The compressed air supply installation as claimed in claim 13 , wherein the venting valve is formed by means of a relay piston which can be subjected to control pressure, wherein the control pressure can be controlled by the control valve, wherein the relay piston is designed for switching of the venting valve into an opened or closed state, wherein the venting valve is a pneumatically actuated 2/2-way directional control valve, wherein the relay piston has a first control face facing a control chamber and a second control face facing a venting rear space, and wherein the first control face and the second control face are arranged for mutually opposed reception of the first control pressure fraction and of the second control pressure fraction, wherein the first and second control pressure fractions are derived from the relay piston control line.

19. The compressed air supply installation as claimed in claim 13 , wherein a second additional venting line, which connects by yet a further second venting-branch connection to the first venting line between the venting valve and the first venting-branch connection, connects to the venting rear space, particularly in the case of a venting connection of the venting valve.

20. The compressed air supply installation as claimed in claim 13 , wherein a second additional venting line is designed for venting the venting rear space of the venting valve when the relay piston is actuated, and the passage of compressed air through the second additional venting line is restricted by means of a third restrictor, and/or wherein a movement of the relay piston when actuated is also damped owing to the thereby defined passage of compressed air from the venting rear space.

21. A compressed air supply system having a compressed air supply installation as claimed in claim 1 and having a pneumatic unit, in particular

Assignees

• Wabco Gmbh

Inventors

• Bodet Marc-Michel
• Meissner Frank

Classifications

• B60G2500/02

  Supply or exhaust flow rates; Pump operation · CPC title

• B60G2500/205

  Air-compressor operation · CPC title

• B60G2500/201

  Air spring system type · CPC title

• F15B2211/30505

  Non-return valves, i.e. check valves · CPC title

• B60G2500/203

  Distributor valve units comprising several elements, e.g. valves, pump or accumulators · CPC title