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1. WO2020108725 - SYSTÈME DE POST-TRAITEMENT

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. An aftertreatment system (100) connected downstream an internal combustion engine arrangement (102) for receiving combustion gas exhausted from the internal combustion engine arrangement (102) during operation thereof, the aftertreatment system (100) comprising:

- a primary aftertreatment system (104) comprising a primary reduction system (105), the primary reduction system (105) comprising a first catalytic reduction arrangement (106);

- a secondary reduction system (108) comprising a second catalytic reduction arrangement (110), the secondary reduction system (108) being positioned in a first conduit (1 12) and arranged in fluid communication between the internal combustion engine arrangement (102) and the primary aftertreatment system (104);

- a bypass conduit (114) connected between the internal combustion engine arrangement (102) and the primary aftertreatment system (104), wherein the bypass conduit (114) and the first conduit (112) are connected in parallel with each other;

- a first valve arrangement (1 16) connected to the bypass conduit (1 14), the first valve arrangement (1 16) being operable in a first state in which combustion gas exhausted from the internal combustion engine arrangement (102) is directed through the first conduit (112) to the primary aftertreatment system (104) via the secondary reduction system (108), and second state in which combustion gas exhausted from the internal combustion engine arrangement (102) is directed through the bypass conduit (114) to the primary aftertreatment system (104) bypassing the secondary reduction system (108); and

- a second valve arrangement (1 18) arranged in the first conduit (112) in fluid communication between the second catalytic reduction arrangement (1 10) and the primary aftertreatment system (104).

2. The aftertreatment system according to claim 1 , wherein the first valve

arrangement (1 16) comprises a three-way valve for selectively directing combustion gas to the first conduit and the bypass conduit.

3. The aftertreatment system according to any one of claims 1 or 2, wherein the second valve arrangement (1 18) is operable from a closed position to an open position when a gas pressure level in the first conduit (112) exceeds a

predetermined gas pressure threshold limit.

4. The aftertreatment system according to any one of the preceding claims, wherein the second valve arrangement (1 18) is one of a pneumatically controlled check valve or an electronically controlled valve connected to a control unit for control of operation thereof.

5. The aftertreatment system according to any one of the preceding claims, wherein the first (106) and second (110) catalytic reduction arrangements are respective selective catalytic reduction devices arranged to convert nitrogen oxides (NOx) into diatomic nitrogen (N2).

6. The aftertreatment system according to any one of the preceding claims, wherein the secondary reduction system (108) comprises a reducing agent injector (120) arranged in the first conduit (112) upstream the second catalytic reduction arrangement (1 10) for supplying reducing agent to the combustion gas before the combustion gas enters the second catalytic reduction arrangement.

7. The aftertreatment system according to any one of the preceding claims, further comprising a control unit (122) connected to the first valve arrangement (1 16) for controlling operation thereof.

8. The aftertreatment system according to claim 7, wherein the control unit is configured to:

- receive a signal indicative of a temperature level of the first catalytic reduction arrangement (106);

- compare the temperature level with a predetermined temperature threshold limit;

- control the first valve arrangement (1 16) to direct combustion gas from the internal combustion engine arrangement (102) to the primary aftertreatment system (104) via the first conduit (112) if the temperature level of the first catalytic reduction arrangement (106) is below to the predetermined temperature threshold limit; and

- control the first valve arrangement (1 16) to direct combustion gas from the internal combustion engine arrangement (102) to the primary aftertreatment system (104) via the bypass conduit (1 14) if the temperature level of the first catalytic reduction arrangement (106) is above or equal to the predetermined temperature threshold limit.

9. The aftertreatment system according to any one of claim 7 or 8, wherein the control unit is configured to:

- receive a signal indicative of a temperature level of the internal combustion engine arrangement;

- compare the temperature level of the internal combustion engine arrangement with a predetermined engine temperature threshold limit;

- control the first valve arrangement to direct combustion gas from the internal combustion engine arrangement to the primary aftertreatment system via the first conduit if the temperature level of the internal combustion engine arrangement is below the predetermined engine temperature threshold limit; and

- control the first valve arrangement to direct combustion gas from the internal combustion engine arrangement to the primary aftertreatment system via the bypass conduit if the temperature level of the internal combustion engine arrangement is above or equal to the predetermined engine temperature threshold limit.

10. The aftertreatment system according to any one of the preceding claims, further comprising a burner arrangement (124) positioned in fluid communication between the internal combustion engine arrangement and the first valve arrangement.

1 1. The aftertreatment system according to any one of the preceding claims, wherein the primary aftertreatment system further comprises a primary reducing agent injector (126) arranged upstream the first catalytic reduction arrangement for supplying reducing agent to the combustion gas before the combustion gas enters to the first catalytic reduction arrangement.

12. The aftertreatment system according to any one of the preceding claims, wherein the primary aftertreatment system further comprises an oxidation catalyst (128) and a particulate filter (130) upstream the first catalytic reduction arrangement.

13. The aftertreatment system according to claim 12, wherein the oxidation catalyst (128) comprises a plurality of catalyst layers (210, 220, 230) for oxidizing

components in the combustion gas.

14. The aftertreatment system according to claim 13, wherein the plurality of catalyst layers comprises a material composition of metal oxides (220) and/or zeolites (210).

15. The aftertreatment system according to any one of claims 13 or 14, wherein the oxidation catalyst further comprises a substrate layer (230) comprising cordierite.

16. A method for controlling an aftertreatment system connected downstream an internal combustion engine arrangement, the aftertreatment system comprises a primary aftertreatment system comprising a primary reduction system, the primary reduction system comprising a first catalytic reduction arrangement; a secondary reduction system comprising a second catalytic reduction arrangement, the secondary reduction system being arranged in fluid communication between the internal combustion engine arrangement and the primary aftertreatment system via a first conduit; and a bypass conduit connected between the internal combustion engine arrangement and the primary aftertreatment system, wherein the bypass conduit and the first conduit are connected in parallel with each other, the method comprising the steps of:

- determining (S1 ) if the internal combustion engine arrangement is operating in a first operating mode or in a second operating mode;

- directing (S2) combustion gas from the internal combustion engine arrangement to the primary aftertreatment system via the secondary reduction system if the internal combustion engine arrangement is operating in the first operating mode;

- directing (S3) combustion gas from the internal combustion engine arrangement to the primary aftertreatment system via the bypass conduit for bypassing the secondary reduction system if the internal combustion engine arrangement is operating in the second operating mode.

17. The method according to claim 16, wherein the internal combustion engine arrangement is operating in the first operating mode if the temperature level of the first catalytic reduction arrangement is below a predetermined temperature threshold limit.

18. The method according to any one of claims 16 or 17, further comprising the steps of:

- determining an amount of ammonia absorbed in the first catalytic reduction arrangement; and

- determining that the internal combustion engine arrangement is operating in the first operating mode if the amount of absorbed ammonia is below a predetermined threshold limit.

19. The method according to any one of claims 16 - 18, wherein the internal combustion engine arrangement is operating in the first operating mode if the temperature level of the internal combustion engine arrangement is below a predetermined engine temperature threshold limit.

20. A vehicle comprising an internal combustion engine arrangement and an aftertreatment system according to any one of claims 1 - 15.

21. A computer program comprising program code means for performing the steps of any one of claims 16 - 19 when said program is run on a computer.

22. A computer readable medium carrying a computer program comprising program means for performing the steps of any one of claims 16 - 19 when said program means is run on a computer.