Compressed air supply system for a commercial vehicle, and method for operating a compressed air supply system

1. A compressed air supply system for a commercial vehicle, comprising:

a compressed air inlet coupleable to a compressor;

a filter module coupled to the compressed air inlet via a delivery line;

a discharge valve unit coupled to a discharge outlet and the delivery line;

an energy-saving control outlet coupleable to a control inlet of the compressor;

a first valve unit and a second valve unit, the first and second valve units being operatively configured to control the discharge valve unit, the energy-saving control outlet and a regeneration of the filter module; and

wherein the first valve unit controls a first control inlet of the discharge valve unit, the energy-saving control outlet, and the regeneration of the filter module, and the second valve unit controls a second control inlet of the discharge valve unit.

2. The compressed air supply system as claimed in claim 1 , wherein the first valve unit evacuates the first control inlet of the discharge valve unit in a first switching state and ventilates the first control inlet of the discharge valve unit in a second switching state, and wherein the discharge valve unit is brought into an opened state by ventilation of the first control inlet when the second control inlet is evacuated.

3. The compressed air supply system as claimed in claim 2 , wherein the second valve unit evacuates the second control inlet of the discharge valve unit in a first switching state and ventilates the second control inlet of the discharge valve unit in a second switching state, and wherein the discharge valve unit is closed when the second control inlet is ventilated, even when the first control inlet is ventilated.

4. The compressed air supply system as claimed in claim 3 , wherein, in a first operating state of the compressed air supply system, the first valve unit assumes its first switching state and the second valve unit assumes its first switching state, so that a first delivery operating state prevails.

5. The compressed air supply system as claimed in claim 4 , wherein, in a second operating state of the compressed air supply system, the first valve unit assumes its first switching state and the second valve unit assumes its second switching state, so that a second delivery operating state prevails.

6. The compressed air supply system as claimed in claim 5 , wherein, in that in a third operating state of the compressed air supply system, the first valve unit assumes its second switching state and the second valve unit assumes its first switching state, so that a regeneration operating state prevails.

7. The compressed air supply system as claimed in claim 6 , wherein, in a fourth operating state of the compressed air supply system, the first valve unit assumes its second switching state and the second valve unit assumes its second switching state, so that a closed operating state prevails.

8. The compressed air supply system as claimed in claim 1 , wherein the first valve unit is arranged in a regeneration air path of the compressed air supply system.

9. The compressed air supply system as claimed in claim 1 , further comprising a regeneration valve unit, which is pneumatically actuatable via the first valve unit, the regeneration valve unit being arranged in a regeneration air path of the compressed air supply system.

10. The compressed air supply system as claimed in claim 9 , wherein the regeneration valve unit has a first control inlet, via which the regeneration valve unit is pneumatically actuatable by the first valve unit, and a second control inlet, via which the regeneration valve unit is pneumatically actuatable by the second valve unit.

11. The compressed air supply system as claimed in claim 10 , wherein the second valve unit evacuates the second control inlet of the regeneration valve unit in its first switching state and ventilates the second control inlet of the regeneration valve unit in its second switching state, and wherein the regeneration valve unit is closed when the second control inlet is ventilated, even when the first control inlet is ventilated.

12. The compressed air supply system as claimed in claim 9 , wherein the regeneration valve unit is a 2/2-way valve.

13. A compressed air supply as claimed in claim 9 , wherein the discharge valve unit and the regeneration valve unit are integrated into a 4/2-way valve.

14. The compressed air supply system as claimed in claim 1 , wherein the second valve unit is coupled to a control line, which serves to perform further control functions in the compressed air supply system.

15. The compressed air supply system as claimed in claim 14 , wherein the control line is connected to a control inlet of an overflow valve supplying a consumer circuit.

16. The compressed air supply system as claimed in claim 15 , wherein opening of the overflow valve is assisted by ventilation of the control inlet.

17. The compressed air supply system as claimed in claim 15 , wherein ventilation of the control inlet serves to bring about and maintain a closed state of the overflow valve.

18. The compressed air supply system as claimed in claim 1 , wherein the first and second valve units are 3/2-way valves.

19. The compressed air supply system as claimed in claim 1 , further comprising an electronic control module operably coupled with the first and second valve units, said valve units being solenoid valves.

20. The compressed air supply system as claimed in claim 1 , wherein the discharge valve unit is a 2/2-way valve.

21. A method for operating a compressed air supply system having a compressed air inlet coupleable to a compressor, a filter module coupled to the compressed air inlet via a delivery line, a discharge valve unit coupled to a discharge outlet and the delivery line, an energy-saving control outlet coupleable to a control inlet of the compressor, and first and second valve units, the method comprising the acts of:

controlling, via the first valve unit, a first control inlet of the discharge valve unit, the energy-saving control outlet coupled to the control inlet of the compressor, and a regeneration of the filter module; and

controlling, via the second valve unit, a second control inlet of the discharge valve unit.

22. The method as claimed in claim 21 , wherein the first valve unit evacuates the first control inlet of the discharge valve unit in a first switching state and ventilates the first control inlet of the discharge valve unit in a second switching state, and wherein the discharge valve unit is brought into an opened state by ventilation of the first control inlet when the second control inlet is evacuated.

23. The method as claimed in claim 22 , wherein the second valve unit evacuates the second control inlet of the discharge valve unit in a first switching state and ventilates the second control inlet of the discharge valve unit in a second switching state, and wherein the discharge valve unit is closed when the second control inlet is ventilated, even when the first control inlet is ventilated.

24. The method as claimed in claim 23 , wherein, a first operating state of the compressed air supply system, the first valve unit assumes its first switching state and the second valve unit assumes its first switching state, so that a first delivery operating state prevails.

25. The method as claimed in claim 24 , wherein, in a second operating state of the compressed air supply system, the first valve unit assumes its first switching state and the second valve unit assumes its second switching state, so that a second delivery operating state prevails.

26. The method as claimed in claim 25 , wherein, in a third operating state of the compressed air supply system, the first valve unit assumes its second switching state and the second valve unit assumes its first switching state, so that a regeneration operating state prevails.

27. The method as claimed in claim 26 , wherein, in a fourth operating state of the compressed air supply system, the first valve unit assumes its second switching state and the second valve unit assumes its second switching state, so that a closed operating state prevails.

28. The method as claimed in claim 21 , wherein the first valve unit is arranged in a regeneration air path of the compressed air supply system.

29. The method as claimed in claim 21 , wherein a regeneration valve unit is pneumatically actuated via the first valve unit, the regeneration valve unit being arranged in a regeneration air path of the compressed air supply system.

30. The method as claimed in claim 29 , wherein the regeneration valve unit has a first control inlet, via which it can be pneumatically actuated by the first valve unit, and wherein the regeneration valve unit has a second control inlet via which it can be pneumatically actuated by the second valve unit.

31. The method as claimed in claim 30 , wherein the second valve unit evacuates the second control inlet of the regeneration valve unit in its first switching state and ventilates the second control inlet of the regeneration valve unit in its second switching state, and wherein the regeneration valve unit is closed when the second control inlet is ventilated, even when the first control inlet is ventilated.

32. The method as claimed in claim 21 , wherein the second valve unit is coupled to a control line, which serves to perform further control functions in the compressed air supply system.

33. The method as claimed in claim 32 , wherein the control line is connected to a control inlet of an overflow valve supplying a consumer circuit.

34. The method as claimed in claim 33 , wherein opening of the overflow valve is assisted by ventilation of the control inlet.

35. The method as claimed in claim 33 , wherein ventilation of the control inlet serves to bring about and maintain a closed state of the overflow valve.

36. The method as claimed in claim 21 , wherein the valve units are actuated by an electronic control module.