Patent ID: 7310946

Claim:
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.