초록 ▼

The invention relates to a circuit arrangement (K) comprising a low-temperature circuit (NK) for cooling charge air (13) that is fed to a motor (8) in a motor vehicle equipped with a turbocharger. According to the invention, the charge air (13) is compressed in two stages in a first low-pressure tur

The invention relates to a circuit arrangement (K) comprising a low-temperature circuit (NK) for cooling charge air (13) that is fed to a motor (8) in a motor vehicle equipped with a turbocharger. According to the invention, the charge air (13) is compressed in two stages in a first low-pressure turbocharger (1) and a second high-pressure turbocharger (2). To cool the charge air (13) a first cooler (3) is provided downstream of the low-pressure turbocharger (1) and upstream of the high-pressure turbocharger (2) and a second cooler (4) is provided downstream of the high-pressure turbocharger (2) and upstream of the motor (8). The invention also relates to a method for operating a circuit arrangement (K) of this type.

대표청구항 ▼

The invention claimed is: 1. A method for operating a circuit arrangement, wherein the circuit arrangement comprises a low-temperature circuit for cooling charge air that is fed to an engine in a motor vehicle equipped with turbochargers, comprising: compressing the charge air in a first compressin

The invention claimed is: 1. A method for operating a circuit arrangement, wherein the circuit arrangement comprises a low-temperature circuit for cooling charge air that is fed to an engine in a motor vehicle equipped with turbochargers, comprising: compressing the charge air in a first compressing stage with a first low-pressure turbocharger, cooling the charge air in a first cooling stage using a low-pressure charge air/coolant cooler provided downstream of the low-pressure turbocharger and upstream of a second high-pressure turbocharger, wherein coolant from the low-pressure charge air/coolant cooler flows into a coolant/air cooler; further compressing the cooled charge air in a second compressing stage with the second high-pressure turbocharger; and cooling the further compressed charge air in a second cooling stage using a high-pressure charge air/air cooler provided downstream of the high-pressure turbocharger and upstream of the engine, wherein the high-pressure charge air/air cooler is configured to use air flow of cooling air in a main cooling circuit upstream of a main coolant cooler as seen in a direction of the air flow of the cooling air. 2. The method for operating a circuit arrangement as claimed in claim 1, wherein the charge air after the first cooling stage has a temperature of between 40째 C. and 110째 C. 3. A circuit arrangement comprising: a low-temperature circuit for cooling charge air that is fed to an engine in a motor vehicle equipped with turbochargers, wherein the low-temperature circuit comprises: a first low-pressure turbocharger for compressing the charge air in a first compressing stage; a second high pressure turbocharger for compressing the charge air in a second compressing stage; a first cooler provided downstream of the low-pressure turbocharger and upstream of the high-pressure turbocharger for cooling the charge air in a first cooling stage; a second cooler provided downstream of the high-pressure turbocharger and upstream of the engine for cooling the charge air in a second cooling stage, and a third cooler, wherein the third cooler and the second cooler form a cooling module, wherein a front face of the third cooler takes up 20% to 50% of a total front surface of the cooling module, wherein the low-temperature circuit is part of an engine cooling circuit. 4. The circuit arrangement as claimed in claim 3, wherein the low-temperature circuit branches off from a pressure side of a pump from the engine cooling circuit and is fed back to the engine cooling circuit at an engine outlet. 5. The circuit arrangement as claimed in claim 3, wherein the first cooler comprises a low-pressure charge air/coolant cooler. 6. The circuit arrangement as claimed in claim 3, wherein the second cooler comprises a high-pressure charge air/air cooler. 7. The circuit arrangement as claimed in claim 6, wherein the third cooler is a low-temperature cooler. 8. A circuit arrangement comprising: a low-temperature circuit for cooling charge air that is fed to an engine in a motor vehicle equipped with turbochargers, wherein the low-temperature circuit comprises: a first low-pressure turbocharger for compressing the charge air in a first compressing stage; a second high pressure turbocharger for compressing the charge air in a second compressing stage; a low-pressure charge air/coolant cooler provided downstream of the low-pressure turbocharger and upstream of the high-pressure turbocharger for cooling the charge air in a first cooling stage; a high-pressure charge air/air cooler provided downstream of the high-pressure turbocharger and upstream of the engine for cooling the charge air in a second cooling stage, and a third cooler that receives coolant from the low-pressure charge air/coolant cooler, wherein the high-pressure charge air/air cooler is configured to use air flow of cooling air in a main cooling circuit upstream of a main coolant cooler as seen in a direction of the air flow of the cooling air. 9. The circuit arrangement as claimed in claim 8, wherein the third cooler is a low-temperature cooler, and wherein the high-pressure charge air/air cooler is arranged alongside the low-temperature cooler. 10. The circuit arrangement as claimed in claim 9, wherein the low-temperature cooler and the high-pressure charge air/air cooler form a cooling module, wherein a front face of the low-temperature cooler takes up 20% to 50% of a total front surface of the cooling module. 11. The circuit arrangement as claimed in claim 8, wherein the motor vehicle comprises an engine cooling circuit, wherein the low-temperature circuit is independent of the engine cooling circuit and has its own pump for delivering coolant. 12. The circuit arrangement as claimed in claim 11, wherein the pump in the low-temperature circuit is arranged between the third cooler and the low-pressure charge air/coolant cooler or between the low-pressure charge air/coolant cooler and the third cooler. 13. The circuit arrangement as claimed in claim 8, wherein the low-temperature circuit is part of an engine cooling circuit. 14. The circuit arrangement as claimed in claim 13, wherein the low-temperature circuit branches off from a pressure side of a pump from the engine cooling circuit and is fed back to the engine cooling circuit at an engine outlet. 15. A circuit arrangement comprising: a low-temperature circuit for cooling charge air that is fed to an engine in a motor vehicle equipped with turbochargers, wherein the low-temperature circuit comprises: a first low-pressure turbocharger for compressing the charge air in a first compressing stage; a second high pressure turbocharger for compressing the charge air in a second compressing stage; a first cooler provided downstream of the low-pressure turbocharger and upstream of the high-pressure turbocharger for cooling the charge air in a first cooling stage; a second cooler provided downstream of the high-pressure turbocharger and upstream of the engine for cooling the charge air in a second cooling stage, wherein the second cooler comprises a high-pressure charge air/air cooler; and a third cooler, wherein the third cooler is a low-temperature cooler configured such that low-temperature coolant from the first cooler flows through the low-temperature cooler, wherein the high-pressure charge air/air cooler is arranged alongside the low-temperature cooler and, seen in a direction of air flow of cooling air, upstream of a main coolant cooler. 16. The circuit arrangement as claimed in claim 15, wherein the low-temperature cooler and the high-pressure charge air/air cooler form a cooling module, wherein a front face of the low-temperature cooler takes up 20% to 50% of a total front surface of the cooling module. 17. The circuit arrangement as claimed in claim 15, wherein the first cooler comprises a low-pressure charge air/coolant cooler. 18. The circuit arrangement as claimed in claim 15, wherein the motor vehicle comprises an engine cooling circuit, wherein the low-temperature circuit is independent of the engine cooling circuit and has its own pump for delivering coolant. 19. The circuit arrangement as claimed in claim 18, wherein the pump in the low-temperature circuit is arranged between the low-temperature cooler and the first cooler or between the first cooler and the low-temperature cooler. 20. The circuit arrangement as claimed in claim 15, wherein the low-temperature circuit is part of an engine cooling circuit. 21. The circuit arrangement as claimed in claim 20, wherein the low-temperature circuit branches off from a pressure side of a pump from the engine cooling circuit and is fed back to the engine cooling circuit at an engine outlet.