Electro-pneumatic two-channel axle modulator

1. An electro-pneumatic two-channel axle modulator ( 1 ) for utility vehicles, comprising:

a first supply port ( 2 ) for connecting a first compressed air supply ( 3 ) and a second supply port ( 4 ) for connecting a second compressed air supply ( 5 );

a front axle channel port ( 6 );

a rear axle channel port ( 8 );

an electro-pneumatic front axle valve assembly ( 10 ) connected to the first supply port ( 2 ) for controlling a front axle brake pressure (pVA) at the front axle channel port ( 6 );

an electro-pneumatic rear axle valve assembly ( 12 ) connected to the second supply port ( 4 ) for controlling a rear axle brake pressure (pHA) at the rear axle channel port ( 8 ); and

a first redundancy valve assembly ( 14 ) connected to the second supply port ( 4 ) for controlling a redundant front axle brake pressure (pVAR) at the front axle channel port ( 6 ).

2. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 1 , further comprising a second redundancy valve assembly ( 16 ) connected to the first supply port ( 2 ) for controlling a redundant rear axle brake pressure (pHAR) at the rear axle channel port ( 8 ).

3. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 1 , further comprising a first redundancy port ( 15 ) for receiving a first redundancy pressure (pR 1 ) connected to the first redundancy valve assembly ( 14 ).

4. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 2 , further comprising a second redundancy port ( 17 ) for receiving a second redundancy pressure (pR 2 ) connected to the second redundancy valve assembly ( 16 ).

5. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 1 , wherein

the electro-pneumatic front axle valve assembly ( 10 ) has a front axle pilot unit ( 18 ) having a front axle inlet valve ( 22 ) for controlling a first front axle control pressure (pVS 1 ), and a front axle outlet valve ( 24 ), and

the electro-pneumatic rear axle valve assembly ( 12 ) has a rear axle pilot unit ( 20 ) having a rear axle inlet valve ( 26 ) for controlling a first rear axle control pressure (pHS 1 ), and a rear axle outlet valve ( 28 ).

6. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 3 , wherein the first redundancy valve assembly ( 14 ) has a first electro-pneumatic redundancy valve ( 30 ) connected to the first redundancy port ( 15 ), and a first redundancy relay valve ( 31 ).

7. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 2 , wherein the second redundancy valve assembly ( 16 ) has a second redundancy relay valve ( 33 ).

8. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 4 , wherein the second redundancy valve assembly ( 16 ) has a second electro-pneumatic redundancy valve ( 32 ) connected to the second redundancy port ( 17 ).

9. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 6 , wherein the first redundancy relay valve ( 31 ) has a first redundancy relay valve supply port ( 31 . 1 ) connected to the second supply port ( 4 ), a first redundancy relay valve venting port ( 31 . 2 ) connected to a vent ( 7 ), a first redundancy relay valve working port ( 31 . 3 ) connectable to the front axle channel port ( 6 ), and a first redundancy relay valve control port ( 31 . 4 ) connected to the first electro-pneumatic redundancy valve ( 30 ).

10. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 8 , wherein the second redundancy relay valve ( 33 ) has a second redundancy relay valve supply port ( 33 . 1 ) connected to the first supply port ( 2 ), a second redundancy relay valve venting port ( 33 . 2 ) connected to a vent ( 7 ), a second redundancy relay valve working port ( 33 . 3 ) connectable to the rear axle channel port ( 8 ), and a second redundancy relay valve control port ( 33 . 4 ) connected to a first electro-pneumatic redundancy valve ( 30 ) or the second electro-pneumatic redundancy valve ( 32 ).

11. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 5 ,

wherein the electro-pneumatic front axle valve assembly ( 10 ) has a pneumatic front axle main valve assembly ( 40 ) connected to the first supply port ( 2 ) and receiving the first front axle control pressure (pVS 1 ) and is configured, in response to receiving the first front axle control pressure (pVS 1 ), to control the front axle brake pressure (pVA) at the front axle channel port ( 6 ), and

wherein the electro-pneumatic rear axle valve assembly ( 12 ) has a pneumatic rear axle main valve assembly ( 42 ) connected to the second supply port ( 4 ) and receiving the first rear axle control pressure (pHS 1 ) and is configured, in response to receiving the first rear axle control pressure (pHS 1 ), to control the rear axle brake pressure (pHA) at the rear axle channel port ( 8 ).

12. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 11 , wherein the front axle main valve assembly ( 40 ) is connected to a first redundancy relay valve ( 31 ) for venting the front axle channel port ( 6 ).

13. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 11 , wherein the rear axle main valve assembly ( 42 ) is connected to a second redundancy relay valve ( 33 ) for venting the rear axle channel port ( 8 ).

14. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 11 , wherein the pneumatic front axle main valve assembly ( 40 ) has

a front axle air admission main valve ( 44 ) connected to the first supply port ( 2 ) and the front axle channel port ( 6 ), and

a front axle venting main valve ( 45 ) connectable to a vent ( 7 ) and connected to the front axle channel port ( 6 ).

15. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 11 , wherein the pneumatic rear axle main valve assembly ( 42 ) has

a rear axle air admission main valve ( 46 ) connected to the second supply port ( 4 ) and the rear axle channel port ( 8 ), and

a rear axle venting main valve ( 47 ) connected or connectable to a vent ( 7 ) and connected to the rear axle channel port ( 8 ).

16. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 14 , wherein the front axle venting main valve ( 45 ) is connected to a first redundancy relay valve working port ( 31 . 3 ).

17. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 15 , wherein the rear axle venting main valve ( 47 ) is connected to a second redundancy relay valve working port ( 33 . 3 ).

18. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 11 , wherein the pneumatic front axle main valve assembly ( 40 ) has a front axle relay valve ( 50 ), and the pneumatic rear axle main valve assembly ( 42 ) has a rear axle relay valve ( 52 ).

19. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 18 , wherein the front axle relay valve ( 50 ) has a front axle relay valve supply port ( 50 . 1 ) connected to the first supply port ( 2 ), a front axle relay valve venting port ( 50 . 2 ) connected to a first redundancy relay valve working port ( 31 . 3 ), a front axle relay valve working port ( 50 . 3 ) connected to the front axle channel port ( 6 ), and a front axle relay valve control port ( 50 . 4 ) connected to the front axle pilot unit ( 18 ).

20. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 18 , wherein the rear axle relay valve ( 52 ) has a rear axle relay valve supply port ( 52 . 1 ) connected to the second supply port ( 4 ), a rear axle relay valve venting port ( 52 . 2 ) connected to a second redundancy relay valve working port ( 33 . 3 ), a rear axle relay valve working port ( 52 . 3 ) connected to the rear axle channel port ( 8 ), and a rear axle relay valve control port ( 52 . 4 ) connected to the rear axle pilot unit ( 20 ).

21. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 9 , wherein the first electro-pneumatic redundancy valve ( 30 ) has a first redundancy valve port ( 30 . 1 ) connected to the first redundancy port ( 15 ), a second redundancy valve port ( 30 . 2 ) connected to the first redundancy relay valve control port ( 31 . 4 ), and a third redundancy valve port ( 30 . 3 ) connected to a vent ( 7 ).

22. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 21 , wherein the second redundancy valve port ( 30 . 2 ) is also connected to a second redundancy relay valve control port ( 33 . 4 ).

23. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 10 , wherein the second electro-pneumatic redundancy valve ( 32 ) has a fourth redundancy valve port ( 32 . 1 ) connected to the second redundancy port ( 17 ), a fifth redundancy valve port ( 32 . 2 ) connected to the second redundancy relay valve control port ( 33 . 4 ), and a sixth redundancy valve port ( 33 . 3 ) connected to a vent ( 7 ).

24. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 1 , further comprising an electrical control unit (ECU) having an electrical terminal for receiving brake signals (SB) and for providing corresponding switching signals (S 1 , S 2 , S 3 , S 4 ) at least to the electro-pneumatic front axle valve assembly ( 10 ) and the electro-pneumatic rear axle valve assembly ( 12 ).

25. The electro-pneumatic two-channel axle modulator ( 1 ) as claimed in claim 1 , further comprising a first pressure sensor ( 61 ) for detecting the front axle brake pressure (pVA) and providing a corresponding front axle pressure signal (SVD), and a second pressure sensor ( 63 ) for detecting the rear axle brake pressure (pHA) and providing a corresponding rear axle pressure signal (SHD).