EXHAUST GAS RECIRCULATION SYSTEM

Abstract

An exhaust gas recirculation system comprises an exhaust gas cooler (1) downstream of which a condenser (2) is disposed through which flows fresh air (7).

Claims

1.-7. (canceled)

8. An exhaust gas recirculation system with an exhaust gas cooler downstream of which is disposed a condenser through which flows fresh air.

9. An exhaust gas recirculation system with an exhaust gas cooler according to claim 1, wherein the condenser comprises a tube through which flows fresh air,

10. An exhaust gas recirculation system with an exhaust gas cooler according to claim 9, wherein the tube axis of the fresh air tube extends substantially perpendicularly to the direction of flow of the exhaust gas.

11. An exhaust gas recirculation system with an exhaust gas cooler according to claim 8, wherein the fresh air tube comprises ribs.

12. An exhaust gas recirculation system with an exhaust gas cooler according to claim 8, wherein the condenser comprises an outlet leading to a tank.

13. An exhaust gas recirculation system with an exhaust gas cooler according to claim 12, wherein the tank is connectable to the combustion chamber and/or to an exhaust gas outlet of a combustion engine.

14. An exhaust gas recirculation system with an exhaust gas cooler according to claim 8, wherein the condenser is provided in an exhaust gas collector.

15. An exhaust gas recirculation system with an exhaust gas cooler according to claim 9, wherein the fresh air tube comprises ribs.

16. An exhaust gas recirculation system with an exhaust gas cooler according to claim 9, wherein the condenser comprises an outlet leading to a tank.

17. An exhaust gas recirculation system with an exhaust gas cooler according to claim 10, wherein the condenser comprises an outlet leading to a tank.

18. An exhaust gas recirculation system with an exhaust gas cooler according to claim 11, wherein the condenser comprises an outlet leading to a tank.

19. An exhaust gas recirculation system with an exhaust gas cooler according to claim 9, wherein the condenser is provided in an exhaust gas collector.

20. An exhaust gas recirculation system with an exhaust gas cooler according to claim 10, wherein the condenser is provided in an exhaust gas collector.

21. An exhaust gas recirculation system with an exhaust gas cooler according to claim 11, wherein the condenser is provided in an exhaust gas collector.

22. An exhaust gas recirculation system with an exhaust gas cooler according to claim 12, wherein the condenser is provided in an exhaust gas collector.

23. An exhaust gas recirculation system with an exhaust gas cooler according to claim 13, wherein the condenser is provided in an exhaust gas collector.

24. An exhaust gas recirculation system with an exhaust gas cooler according to claim 15, wherein the condenser is provided in an exhaust gas collector.

25. An exhaust gas recirculation system with an exhaust gas cooler according, to claim 16, wherein the condenser is provided in an exhaust gas collector.

26. An exhaust gas recirculation system with an exhaust gas cooler according to claim 17, wherein the condenser is provided in an exhaust gas collector,

27. An exhaust gas recirculation system with an exhaust gas cooler according to claim 18, wherein the condenser is provided in an exhaust gas collector.

Description

BRIEF DESCRIPTION OF THE DRAWING

[0014] In the following an embodiment example of the invention will be explained in greater detail with reference to the Figures. In the drawing depict:

[0015] FIG. 1 a schematic side view of the exhaust gas cooler according to the invention;

[0016] FIG. 2 a schematic bottom view of the exhaust gas cooler according to the invention;

[0017] FIG. 3 a schematic diagram in a first operating state and

[0018] FIG. 4 a schematic diagram in a second operating state,

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT EXAMPLE OF THE INVENTION

[0019] As can be seen in FIG. 1, the exhaust gas 9 to be recirculated flows first through the exhaust gas cooler 1 and subsequently through the condenser 2. In the depicted case the latter is essentially formed by a volume encompassed by a housing through which extends a fresh air tube 3 whose diameter is only insignificantly less than the dimension of the described condenser housing. At its bottom is located an outlet 4 for the condensate. By 5 is designated an exhaust gas recirculation valve, disposed downstream of condenser 2, that regulates the flow rate of the exhaust gas now freed of the water vapor and consequently dried. Said housing may be the housing of an exhaust gas collector downstream of the exhaust gas cooler 1. The exhaust gas cooler 1 may in particular comprise numerous separate tubes or channels through which the exhaust gas flows, wherein the individual exhaust gas flows are combined in the region of the described exhaust gas collector.

[0020] In the bottom view of FIG. 2 ribs 8 are supplementarily indicated which can be developed on the fresh air tube 3 such that they completely encircle it and/or extend parallel to the direction of flow of the exhaust gas. In the bottom view of FIG. 2 can be seen further that the fresh air tube 3 extends fully through the housing of the condenser [2]. The fresh air flow is denoted by 7. It can be seen that a preferred configuration is depicted in which the fresh air flow 7 is substantially perpendicular to the exhaust gas flow.

[0021] In FIG. 3 a tank 11 is additionally depicted which is connected to an outlet 4 of the condenser 2 such that across a duct 10 the condensate can be collected in the tank 11. As shown in FIG. 3, the condensate can be recirculated from this tank 11 into the combustion chamber. FIG. 3 further indicates that the engine can comprise an exhaust turbocharger 12 disposed, in the direction of flow, upstream of a catalyst 13.

[0022] After the fresh air to be charged, as indicated in FIG. 3, contains recirculated exhaust gas, the condenser [2], disposed according to the invention downstream of the exhaust gas cooler [1], notably deploys its effect since the recirculated exhaust gas has been dried and the water vapor, originally contained therein, cannot do any damage to the compressor wheel of the exhaust gas turbocharger.

[0023] In FIG. 4 is depicted an alternative diagram in which the condensate is also collected in a tank 11 from which, however, is it evaporated and mixed to the exhaust gas discharged from the motor vehicle. The architectural execution corresponds otherwise to that of FIG. 3.