The invention relates to an air-cooled exhaust gas heat exchanger, in particular exhaust gas cooler (1) for motor vehicles comprising channels (exhaust gas channels) which can be cross-flown by the exhaust gas of an internal combustion engine, between which ribs (4) for air cooling are arranged. Acc
The invention relates to an air-cooled exhaust gas heat exchanger, in particular exhaust gas cooler (1) for motor vehicles comprising channels (exhaust gas channels) which can be cross-flown by the exhaust gas of an internal combustion engine, between which ribs (4) for air cooling are arranged. According to the invention, the exhaust gas channels are embodied as tubes, in particular as flat tubes (3), which form the ribs (4) of a rib tube block (2) and the tube (3) has tube ends (3a) which are received in the collecting vessels (5) for the exhaust gas.
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1. An air-cooled exhaust gas heat exchanger for a motor vehicle, the exhaust gas heat exchanger comprising: a plurality of flat exhaust gas tubes configured to allow a flow of exhaust gas therethrough;a plurality of ambient air ducts arranged between the flat exhaust gas tubes and configured to allo
1. An air-cooled exhaust gas heat exchanger for a motor vehicle, the exhaust gas heat exchanger comprising: a plurality of flat exhaust gas tubes configured to allow a flow of exhaust gas therethrough;a plurality of ambient air ducts arranged between the flat exhaust gas tubes and configured to allow a flow of ambient air therethrough;first and second collecting tanks configured to receive ends of the flat exhaust gas tubes; andat least one coolant duct arranged upstream of the plurality of flat exhaust gas tubes in a direction of the flow of ambient air;wherein each of the ambient air ducts comprises a plurality of fins,wherein the plurality of flat exhaust gas tubes and the plurality of fins of the ambient air ducts form a fin/tube block, andwherein each of the flat exhaust gas tubes comprises a plurality of turbulence inserts, soldered-in internal fins, or winglets. 2. The exhaust gas heat exchanger as claimed in claim 1, wherein the flat exhaust gas tubes comprise steel. 3. The exhaust gas heat exchanger as claimed in claim 1, wherein the fins of the ambient air ducts comprise steel or a non-ferrous metal. 4. The exhaust gas heat exchanger as claimed in claim 1, wherein the fins of the ambient air ducts are corrugated fins and comprise gills. 5. The exhaust gas heat exchanger as claimed in claim 1, wherein the fins of the ambient air ducts are webbed fins. 6. The exhaust gas heat exchanger as claimed in claim 1, wherein the flat exhaust gas tubes are arranged in a plurality of rows. 7. The exhaust gas heat exchanger as claimed in claim 1, wherein the first and second collecting tanks for the exhaust gas comprise stainless steel or plastic. 8. The exhaust gas heat exchanger as claimed in claim 1, wherein the fins of the ambient air ducts have a fin density in a range from 20 to 80 fins/dm. 9. The exhaust gas heat exchanger as claimed in claim 1, wherein at least one of the plurality of flat exhaust gas tubes has a hydraulic diameter dh which is in a range of 2≦dh ≦20. 10. The exhaust gas heat exchanger as claimed in claim 1, wherein the fin/tube block has a depth T, measured in a direction of the flow of ambient air, in a range of 20≦T≦100 mm. 11. The exhaust gas heat exchanger as claimed in claim 1, wherein: the fin/tube block has a height H and the length L, and a ratio of height H to length L is in a range of 0.1≦H/L≦0.8. 12. The exhaust gas heat exchanger as claimed in claim 1, further comprising a bypass duct for the exhaust gas. 13. The exhaust gas heat exchanger as claimed in claim 1, further comprising a bypass duct for the exhaust gas, wherein the exhaust gas heat exchanger has a pressure drop ΔPAk and the bypass duct has a pressure drop ΔPBy,wherein the exhaust gas heat exchanger and the bypass duct are configured such that, when the exhaust gas heat exchanger is open, a relationship ΔPBy >ΔPAk applies, and when the exhaust gas heat exchanger is partially or completely blocked, a relationship ΔPBy <ΔPAk applies. 14. The exhaust gas heat exchanger as claimed in claim 1, further comprising a bypass configured to be controlled externally as a function of a through flow cross section of the exhaust gas heat exchanger. 15. The exhaust gas heat exchanger as claimed in claim 1, wherein a louver is arranged upstream of the exhaust gas heat exchanger in a direction of the flow of ambient air. 16. The exhaust gas heat exchanger as claimed in claim 1, further comprising a condensate discharge located on an exhaust gas outlet side. 17. The exhaust gas heat exchanger as claimed in claim 1, wherein the exhaust gas heat exchanger comprises an integrated EGR valve. 18. The exhaust gas heat exchanger as claimed in claim 1, wherein the at least one coolant duct has a serpentine shape and comprises straight duct sections which are arranged parallel to the flat exhaust gas tubes. 19. The exhaust gas heat exchanger as claimed in claim 1, wherein the coolant duct is connected to a cooling circuit of an internal combustion engine. 20. The exhaust gas heat exchanger as claimed in claim 1, wherein the fin/tube block comprises first and second side parts. 21. The exhaust gas heat exchanger as claimed in claim 20, wherein each of the first and second side parts comprises a further flat tube which cannot be traversed by flow and is connected to an outermost fin layer. 22. The exhaust gas heat exchanger as claimed in claim 1, wherein at least one of the plurality of fins of the ambient air ducts has a fin height h, wherein the following dimensional range applies: 2≦h≦10 mm. 23. The exhaust gas heat exchanger as claimed in claim 22, wherein the fin height h=5 mm. 24. The exhaust gas heat exchanger as claimed in claim 1, wherein at least one of the plurality of flat exhaust gas tubes has a tube height b, wherein the following dimensional range applies: 2≦b≦10 mm. 25. The exhaust gas heat exchanger as claimed in claim 24, wherein the tube height b=4.5 mm. 26. The exhaust gas heat exchanger as claimed in claim 24, wherein a ratio of the tube height b to a height h of at least one of the plurality of fins of the ambient air ducts is in a range 0.5≦b/h≦1.5. 27. The exhaust gas heat exchanger as claimed in claim 1, wherein the exhaust gas heat exchanger is a component of a cooling module, the cooling module comprising a coolant cooler, a condenser, a charge air cooler, or a combination thereof. 28. The exhaust gas heat exchanger as claimed in claim 27, wherein the exhaust gas heat exchanger and the charge air cooler are arranged one above the other in the cooling module. 29. The exhaust gas heat exchanger as claimed in claim 1, further comprising a bypass configured to be controlled by a differential pressure between an exhaust gas inlet and an exhaust gas outlet on the exhaust gas heat exchanger. 30. The exhaust gas heat exchanger as claimed in claim 29, wherein the bypass comprises a differential pressure valve having an exhaust gas supply duct and an exhaust gas return duct which can be separated and bypassed by a valve closing member. 31. The exhaust gas heat exchanger as claimed in claim 30, wherein the exhaust gas supply duct is connected to the exhaust gas inlet of the exhaust gas heat exchanger, and the exhaust gas return duct is connected to the exhaust gas outlet of the exhaust gas heat exchanger. 32. The exhaust gas heat exchanger as claimed in claim 30, wherein the valve closing member is loaded by a closing spring. 33. The exhaust gas heat exchanger as claimed in claim 1, further comprising an electric heater configured to heat the flat exhaust gas tubes. 34. The exhaust gas heat exchanger as claimed in claim 33, wherein the electric heater comprises heating filaments which are arranged in a heat-conducting fashion on an outside of the flat exhaust gas tubes. 35. The exhaust gas heat exchanger as claimed in claim 1, further comprising a displaceable covering device comprising longitudinal slots. 36. The exhaust gas heat exchanger as claimed in claim 35, wherein the longitudinal slots are arranged parallel to the flat exhaust gas tubes. 37. The exhaust gas heat exchanger as claimed in claim 35, wherein the covering device comprises webs between the longitudinal slots, the webs being configured to selectively cover the fins of the ambient air ducts. 38. The exhaust gas heat exchanger as claimed in claim 35, wherein the covering device is configured to be selectively displaced transversely with respect to the flat exhaust gas tubes. 39. The exhaust gas heat exchanger as claimed in claim 1, wherein the exhaust gas heat exchanger and a charge air cooler are connected to one another to form a heat exchanger module. 40. The exhaust gas heat exchanger as claimed in claim 39, wherein at an outlet side of the flat exhaust gas tubes, the exhaust gas is conducted separately from charge air through or around an outlet-side charge air tank of the charge air cooler. 41. The exhaust gas heat exchanger as claimed in claim 40, wherein the exhaust gas is conducted in a separate duct located upstream of an outlet side collecting tank. 42. The exhaust gas heat exchanger as claimed in claim 41, wherein the separate duct is arranged inside or outside the outlet-side charge air tank. 43. The exhaust gas heat exchanger as claimed in claim 42, wherein the separate duct is formed by a partition in the outlet-side charge air tank. 44. The exhaust gas heat exchanger as claimed in claim 41, wherein the separate duct comprises a tube or hose made from plastic, rubber or steel, or as a plastic blow-molded part. 45. The exhaust gas heat exchanger as claimed in claim 40, further comprising a mixing zone located downstream of the charge air tank and configured to allow the exhaust gas and the charge air to mix within the mixing zone. 46. The exhaust gas heat exchanger as claimed in claim 39, further comprising a venturi nozzle configured to suck the exhaust gas from the exhaust gas heat exchanger. 47. The exhaust gas heat exchanger as claimed in claim 39, wherein the exhaust gas heat exchanger and the charge air cooler are integrated to form a common heat exchanger which can be traversed by a flow of charge air in a first direction and the flow of exhaust gas in the first direction and can be cooled by the flow of ambient air in a second direction. 48. The exhaust gas heat exchanger as claimed in claim 47, wherein the exhaust gas and the charge air are supplied to the common heat exchanger via a common inlet connecting piece or via separate inlet connecting pieces. 49. An arrangement for exhaust gas recirculation (EGR) in a motor vehicle having an internal combustion engine with an intake line, an exhaust gas line, and an EGR line, wherein the arrangement comprises the exhaust gas heat exchanger as claimed in claim 1. 50. The arrangement as claimed in claim 49, wherein an exhaust gas cooler is connected upstream of the exhaust gas heat exchanger in the EGR line, the exhaust gas cooler being configured to be cooled by a liquid coolant. 51. The arrangement as claimed in claim 49, wherein the exhaust gas heat exchanger is not arranged on a cooling module. 52. The arrangement as claimed in claim 49, wherein a separate fan for feeding cooling air is connected upstream or downstream of the exhaust gas heat exchanger. 53. The exhaust gas heat exchanger as claimed in claim 1, wherein an oxidation catalytic converter is connected upstream of the exhaust gas heat exchanger. 54. The exhaust gas heat exchanger as claimed in claim 53, wherein the oxidation catalytic converter is arranged inside or outside an inlet-side collecting tank for the exhaust gas. 55. An air-cooled exhaust gas heat exchanger for a motor vehicle, the exhaust gas heat exchanger comprising: a plurality of flat exhaust gas tubes configured to allow a flow of exhaust gas therethrough;a plurality of ambient air ducts arranged between the flat exhaust gas tubes and configured to allow a flow of ambient air therethrough; andfirst and second exhaust gas collecting tanks that receive open ends of the flat exhaust gas tubes, the first and second exhaust gas collecting tanks being configured to allow the flow of exhaust gas from the first exhaust gas collecting tank to the second exhaust gas collecting tank through the plurality of flat exhaust gas tubes;wherein each of the ambient air ducts comprises a plurality of fins,wherein the plurality of flat exhaust gas tubes and the plurality of fins of the ambient air ducts form a fin/tube block,wherein each of the first and second exhaust gas collecting tanks comprises a flat tube plate with openings into which ends of the flat exhaust gas tubes are welded or soldered, edges of each of the openings being entirely surrounded by flat surfaces forming portions of the flat tube plate, andwherein the exhaust gas heat exchanger further comprises at least one coolant duct arranged upstream of the plurality of flat exhaust gas tubes in a direction of the flow of ambient air. 56. The exhaust gas heat exchanger as claimed in claim 55, wherein the at least one coolant duct has a serpentine shape and comprises straight duct sections which are arranged parallel to the flat exhaust gas tubes. 57. The exhaust gas heat exchanger as claimed in claim 55, wherein the coolant duct is connected to a cooling circuit of an internal combustion engine.
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