Internal combustion engine system

Patent metadata

Field	Value
Publication number	US-10161300-B2
Application number	US-201315106189-A
Country	US
Kind code	B2
Filing date	Dec 19, 2013
Priority date	Dec 19, 2013
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

An internal combustion engine system includes an internal combustion engine, an exhaust system, an exhaust gas recirculation circuit and a turbocharger including a first turbine interacting with a first compressor for charging air to the internal combustion engine. An exhaust gas recirculation passage is arranged to divert exhaust gases from the internal combustion engine upstream the first turbine and to debouch the exhaust gases downstream the first compressor. The internal combustion engine includes a bleed air channel which is located to divert compressed air at a location in or down¬stream from the first compressor and upstream of the internal combustion engine. A second turbine is arranged for receiving bleed air from the bleed air channel to recover energy from the bleed air channel. A vehicle including such an internal combustion engine system is also provided.

First claim

The invention claimed is:

1. An internal combustion engine system comprising:
an internal combustion engine;
an exhaust system;
an exhaust gas recirculation circuit comprising an exhaust gas recirculation passage;
a turbo-charger comprising a first turbine positioned in the exhaust system and interacting with a first compressor for charging air to the internal combustion engine;
a bleed air channel which is located to divert compressed air away from the internal combustion engine at a location in or downstream from the first compressor and upstream of the internal combustion engine; and
a second turbine arranged in the bleed air channel to receive the compressed air from the bleed air channel,
wherein the compressed air from the bleed air channel is not mixed with unpurified exhaust gases upstream or downstream of the first turbine, the second turbine is configured to recover energy of the compressed air from the bleed air channel, and the exhaust gas recirculation passage is arranged to divert exhaust gas from the internal combustion engine upstream the first turbine and to debouch the exhaust gases downstream the first compressor.

2. The internal combustion engine system according to claim 1 , wherein the bleed air channel is directed for heat exchange with a waste heat source originating from the internal combustion engine.

3. The internal combustion engine system according to claim 2 , wherein the waste heat source is an exhaust gas heat source.

4. The internal combustion engine system according to claim 3 , wherein the waste heat source is the exhaust gas recirculation circuit.

5. The internal combustion engine system according to claim 4 , wherein the exhaust gas recirculation circuit comprises an exhaust gas recirculation cooler, and the bleed air channel is directed through the exhaust gas recirculation cooler for heat exchange therein with the exhaust gases.

6. The internal combustion engine system according to claim 5 , wherein a regulating valve located on the bleed air channel for regulating an amount of the compressed air through the bleed air channel.

7. The internal combustion engine system according to claim 6 , further comprising an engine control unit which is arranged, to control the regulating valve.

8. The internal, combustion engine system according to claim 6 , wherein the engine control unit is connected to sensors arranged to indicate an air demand, in the internal combustion engine and arranged to control the regulating valve based on the air demand in the internal combustion engine.

9. The internal combustion engine system according to claim 8 , wherein the engine control unit is connected to sensors arranged to indicate ambient air pressure and arranged to control the regulating valve based on ambient air pressure.

10. The internal combustion engine system according to claim 5 , wherein the compressed air in the bleed air channel and the exhaust gases in the exhaust system are held separated in the exhaust gas recirculation cooler.

11. The internal, combustion engine system according to claim 10 , wherein the compressed air in the bleed air channel and the exhaust gases in the exhaust system are held separated until the compressed air is made to debouch in the exhaust system downstream of any exhaust gas after treatment system connected to the exhaust system.

12. The internal combustion engine system according to claim 3 , wherein the waste heat source is one or more of the exhaust system and an exhaust after treatment system connected to the exhaust system.

13. The internal combustion engine system according to claim 1 , wherein the second turbine is located downstream of an exhaust gas recirculation cooler.

14. The internal combustion engine system according to claim 1 , wherein the second turbine is arranged to recover energy to the internal combustion engine.

15. The internal combustion engine system according to claim 1 , wherein the second turbine is arranged to convert the recovered energy into mechanical energy.

16. The internal combustion engine system according to claim 1 , wherein the second turbine is arranged to convert the recovered energy into electrical energy.

17. The internal combustion engine system according to claim 1 , wherein the second turbine is operatively connected to the internal combustion engine through a gear train.

18. The internal combustion engine system according to claim 17 , wherein the waste heat recovery turbine is arranged to convert the recovered energy into mechanical energy, and wherein, the waste heat recovery turbine is operatively connected to the gear train through which the second turbine is operatively connected to the internal combustion engine.

19. The internal combustion engine system according to claim 1 , further comprising a third turbine interacting with a second compressor, the third turbine and the second compressor being arranged to work at a lower pressure than the first turbine and the first compressor.

20. The internal combustion engine system according to claim 19 , wherein the second turbine is connected to a gear train with the turbocompound turbine.

21. The internal combustion engine system according to claim 1 , wherein the internal combustion engine system further comprises a turbocompound turbine having a gear train for recovering mechanical energy from the exhaust gases, the second turbine being operatively connected to the turbocompound turbine gear train.

22. The internal combustion engine system according to claim 1 , wherein the bleed air channel debouches in the exhaust system down-stream of any exhaust gas after treatment system connected to the exhaust system.

23. The internal combustion engine system according to claim 1 , further comprising a waste heat recovery heat exchanger located in the exhaust system, and a waste heat recovery circuit having a waste heat recovery turbine for recovering energy from the exhaust gases.

24. The internal combustion engine system according to claim 23 , wherein the waste heat recovery heat exchanger is located downstream any exhaust gas after treatment system connected to the exhaust system.

25. The internal combustion engine system according to claim 23 , wherein the waste-heat recovery turbine is arranged to convert the recovered energy into mechanical energy.

26. The internal combustion engine system according to claim 23 , wherein the waste heat recovery turbine is arranged to convert the recovered energy into electrical energy.

27. The internal combustion engine system according to claim 25 , wherein the waste heat recovery' turbine is operatively connected to the internal combustion engine through a gear train.

28. A vehicle comprising an internal combustion engine system,
wherein the internal combustion engine system further comprising:
an internal combustion engine;

an exhaust system;
an exhaust gas recirculation circuit comprising an exhaust gas recirculation passage;
a turbo-charger comprising a first turbine positioned in the exhaust system and interacting with a first compressor for charging air to the internal combustion engine;
a bleed air channel diverting compressed air away from the internal combustion engine at a location in or downstream from the first compressor and upstream of the internal combustion engine; and
a second turbine arranged in the bleed air channel to receive the compressed air

Assignees

• Volvo Truck Corp

Inventors

• Bauer Martin
• Aronsson Ulf

Classifications

• Y02T10/16

  Cross-Sectional Technologies · mapped topic

• F02B37/164

  the bypassed air being used in an auxiliary apparatus, e.g. in an air turbine · CPC title

• F02B41/00

  Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power · CPC title

• F02D41/0007

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• F02M26/08

  for engines having two or more intake charge compressors or exhaust gas turbines, e.g. a turbocharger combined with an additional compressor · CPC title