ARRANGEMENT AT A SUPERCHARGED COMBUSTION ENGINE

• US 20100263369A1
• Filed: 11/06/2008
• Published: 10/21/2010
• Est. Priority Date: 11/16/2007
• Status: Active Grant

• Current Assignee: Scania CV AB (Volkswagen AG)
• Original Assignee: Scania CV AB (Volkswagen AG)
• Inventors: Kardos, Zoltan, Söderberg, Erik, Wikström, Hans
• Granted Patent: US 8,695,340 B2
• Time in Patent Office: Days
• US Class Current: 60/599
• CPC Class Codes: F02B 29/0412 Multiple heat exchangers arranged in parallel or in series
• CPC Class Codes: F02B 29/0431 Details or means to guide the ambient air to the heat exchanger, e.g. having a fan, flaps, a bypass or a special location in the engine compartment
• CPC Class Codes: F02B 29/0443 Layout of the coolant or refrigerant circuit
• CPC Class Codes: F02B 37/004 with exhaust drives arranged in series
• CPC Class Codes: F02B 37/013 with exhaust-driven pumps arranged in series
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

An arrangement for a supercharged combustion engine includes a first compressor compressing air in the engine air inlet line as a first stage and a second compressor compressing the air in the inlet line as a second stage, a first coolant-cooled charge air cooler cooling the air after it has been compressed in the first stage and before it is compressed in the second stage, and an air-cooled charge air cooler cooling the compressed air when it has been compressed by the first stage, a second coolant-cooled charge air cooler cooling the compressed air after it has been compressed in the second stage and before it is compressed in the air-cooled charge air cooler. Exhaust gases in an exhaust line from the engine drive turbines which operate the compressors. A return line from the exhaust line and connected into the inlet line has a cooler for the exhaust gases before mixing the gases with the inlet air.

Claims

1-10. -10. (canceled)

11. An arrangement for a supercharged combustion engine, which arrangement comprises

an exhaust line for connection to the engine to lead exhaust gases out from the combustion engine, an inlet line for connection to the engine to lead air at above atmospheric pressure to the combustion engine,

a first compressor in the inlet line and configured and operable for compressing the air in the inlet line as a first stage,

a second compressor in the inlet line after the first compressor and configured and operable for compressing the air in the inlet line as a second stage after the first stage,

a first coolant-cooled charge air cooler at the inlet line after the first compressor and before the second compressor and configured and operable for cooling the air in the inlet line and after the air has been compressed in the first stage and before the air is compressed in the second stage,

an air-cooled charge air cooler at the inlet line and configured and operable for cooling the compressed air after it has been compressed in the second stage,

a second coolant-cooled charge air cooler at the inlet line and after the second compressor and before the air cooled charge air cooler and configured and operable for cooling the compressed air after the air has been compressed in the second stage and before the air is cooled in the air-cooled charge air cooler,

a return line connected with the exhaust line to receive and recirculate the exhaust gases, the return line being connected to the inlet line for recirculating exhaust gases into the inlet line for mixing the exhaust gases into the compressed air before the inlet line leads into the engine, and

a cooling circuit with a circulating coolant, the cooling circuit comprising a separate cooling system separate from a cooling system operable for cooling the combustion engine, and at least the first coolant-cooled charge air cooler is part of the cooling circuit.

12. An arrangement according to claim 11, wherein the separate cooling system comprises a radiator element configured and operable for the circulating coolant to be cooled by air.

13. An arrangement according to claim 12, wherein the radiator element is situated in a region at the engine at which the radiator element is cooled by air which is at the temperature of the surroundings.

14. An arrangement according to claim 11, wherein the second coolant-cooled charge air cooler is also part of the separate cooling system.

15. An arrangement according to claim 14, wherein the first coolant-cooled charge air cooler and the second coolant-cooled charge air cooler are arranged in parallel in the separate cooling system, such that each of the coolant charge air coolers receives coolant at about the same temperature.

16. An arrangement according to claim 11, wherein the separate cooling system comprises an EGR cooler at the return line and configured and operable for cooling the recirculating exhaust gases in the return line.

17. An arrangement according to claim 11, further comprising a cooling circuit which forms part of a cooling system for cooling the combustion engine, and the second coolant-cooled charge air cooler is in the cooling circuit.

18. An arrangement according to claim 11, further comprising an air-cooled EGR cooler configured and operable for cooling the recirculating exhaust gases in the return line.

19. An arrangement according to claim 11, wherein at least one of the compressors is part of a turbo unit comprising a turbine configured and located for being driven by the exhaust gases in the exhaust line.

20. A supercharged combustion engine, comprising:

an exhaust line for exhausting combustion exhaust gases from the engine, an inlet line for inlet back to the engine of air mixed with exhaust gases from the engine,

starting from the engine, a first turbine in the exhaust line configured for being driven by exhaust gases, followed by a second turbine in the exhaust line configured for being driven by the exhaust gases;

in the inlet line in a direction toward the engine, a first air compressor in the inlet line and connected with the second turbine for being driven by the second turbine;

a first cooler at the inlet line following the first compressor and the first cooler being configured and operable for cooling air in the inlet line that was compressed in the first compressor;

a second air compressor in the inlet line following the first cooler, the second compressor being connected with the first turbine for being driven by the first turbine;

a second cooler at the inlet line following the second compressor, the second cooler being configured and operable for cooling air compressed in the second compressor;

an exhaust gas return line recirculating exhaust gases from the exhaust line to the inlet line into the engine, a connection from the return line into the inlet line following the first and second coolers for mixing recirculating cooled exhaust gases and inlet air before the inlet air is transmitted into the engine.

21. The combustion engine of claim 20, further comprising a third cooler at the return line for the exhaust gases and located before the connection of the return line to the inlet line.

22. The combustion engine of claim 21, wherein the first and the second coolers are coolant-cooled charge air coolers;

a respective cooling circuit with a circulating coolant connected with each of the first and second coolant-cooled charge air coolers for cooling them.

23. The combustion engine of claim 22, further comprising an air cooled charge air cooler at the inlet line after the second coolant-cooled charge air cooler and before the connection to the return line.

24. The combustion engine of claim 21, wherein the third cooler at the return line comprises a first EGR cooler.

25. The combustion engine of claim 24, further comprising a second EGR cooler which is in position to be cooled by air surrounding the engine and is disposed at the return line.