US 8,522,756 B2Granted

Interstage exhaust gas recirculation system for a dual turbocharged engine having a turbogenerator system

AssigneeDeere & Company

InventorsCarl T. Vuk, Richard E. Winsor

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Abstract

An internal combustion engine defined as having an engine block for internal combustion, a high-pressure turbocharger for delivering pressurized intake air to the engine block, a low-pressure turbocharger for delivering pressurized intake air to the high-pressure turbocharger, a turbogenerator for recovering heat energy from the exhaust gas downstream of the low-pressure turbocharger to generate electricity, and an exhaust gas recirculation (EGR) system comprising an EGR-pump drawing exhaust gas from an EGR inlet located between the low-pressure and high-pressure turbocharger turbines, wherein the EGR-pump controllably delivers exhaust gas to an EGR mixer in the pressurized intake air stream at a location between the low-pressure and high-pressure turbocharger compressors. An electronic control unit (ECU) is adapted to command the EGR-pump to deliver a desired EGR flow-rate to the engine block based on look-up tables and either open-loop and/or closed-loop control algorithms.

Claims11

Dependent claims

An internal combustion engine comprising:

an engine block for internal combustion;
a high-pressure (HP) turbocharger having a turbine and a compressor each in communication with the engine block, the turbine being configured for receiving exhaust gas from the engine block, and the compressor being configured for delivering intake air to the engine block;
a low-pressure (LP) turbocharger having a turbine and a compressor each in communication with the HP turbocharger, the turbine being configured for receiving exhaust gas from the HP turbocharger turbine, and the compressor being configured for delivering intake air to the HP turbocharger compressor;
a turbogenerator in communication with the LP turbocharger, the turbogenerator configured for receiving exhaust gas from the LP turbocharger turbine and recovering heat energy from the exhaust gas to generate electricity;
an exhaust gas recirculation (EGR) system having an EGR-pump, an EGR inlet located between the HP turbocharger turbine and the LP turbocharger turbine, and an EGR mixer located between the LP turbocharger compressor and the HP turbocharger compressor, the EGR-pump being configured for drawing exhaust gas from the EGR inlet and controllably delivering exhaust gas to the EGR mixer;
and
an electronic control unit (ECU) coupled with the EGR-pump and adapted to command the EGR-pump to deliver a desired EGR rate to the engine block.

4 more elements

An internal combustion engine comprising:

an engine block for internal combustion;
a high-pressure (HP) turbocharger having a turbine and a compressor each in communication with the engine block, the turbine being configured for receiving exhaust gas from the engine block, and the compressor being configured for delivering intake air to the engine block;
a low-pressure (LP) turbocharger having a turbine and a compressor each in communication with the HP turbocharger, the turbine being configured for receiving exhaust gas from the HP turbocharger turbine, and the compressor being configured for delivering intake air to the HP turbocharger compressor;
a turbogenerator in communication with the LP turbocharger, the turbogenerator configured for receiving exhaust gas from the LP turbocharger turbine and recovering heat energy from the exhaust gas to generate electricity;
an exhaust gas recirculation (EGR) system having an EGR-pump, an EGR inlet located between the HP turbocharger turbine and the LP turbocharger turbine, and an EGR mixer located between the LP turbocharger compressor and the HP turbocharger compressor, the EGR-pump being configured for drawing exhaust gas from the EGR inlet and controllably delivering exhaust gas to an EGR mixer;
an exhaust filter located between the HP turbocharger turbine and the EGR inlet;
a NOx reduction device located between the LP turbocharger turbine and the turbogenerator;
and
a electronic control unit (ECU) coupled with the EGR-pump and adapted to command the EGR-pump to deliver a desired EGR rate to the engine.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/607,390Filed 28 Oct 2009
Published: US 2011/0094485 A128 Apr 2011
Granted: 3 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

F02B 37/013
Engines characterised by provision of pumps driven at least for part of the time by exhaust: with exhaust-driven pumps arranged in series
F01N 5/04
Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy: the devices using kinetic energy
F02B 33/40
With rotary pumps: of non-positive-displacement type
F02B 37/004
Engines characterised by provision of pumps driven at least for part of the time by exhaust: with exhaust drives arranged in series