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Title: Engine with exhaust gas recirculation system and variable geometry turbocharger

Abstract

An engine assembly includes an intake assembly, an internal combustion engine defining a plurality of cylinders and configured to combust a fuel and produce exhaust gas, and an exhaust assembly in fluid communication with a first subset of the plurality of cylinders. Each of the plurality of cylinders are provided in fluid communication with the intake assembly. The exhaust assembly is provided in fluid communication with a first subset of the plurality of cylinders, and a dedicated exhaust gas recirculation system in fluid communication with both a second subset of the plurality of cylinders and with the intake assembly. The dedicated exhaust gas recirculation system is configured to route all of the exhaust gas from the second subset of the plurality of cylinders to the intake assembly. Finally, the engine assembly includes a turbocharger having a variable geometry turbine in fluid communication with the exhaust assembly.

Inventors:
Publication Date:
Research Org.:
GM Global Technology Operations LLC, Detroit, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1351821
Patent Number(s):
9,175,644
Application Number:
13/869,323
Assignee:
GM Global Technology Operations LLC (Detroit, MI) DOEEE
DOE Contract Number:
EE0005654
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Apr 24
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 33 ADVANCED PROPULSION SYSTEMS

Citation Formats

Keating, Edward J. Engine with exhaust gas recirculation system and variable geometry turbocharger. United States: N. p., 2015. Web.
Keating, Edward J. Engine with exhaust gas recirculation system and variable geometry turbocharger. United States.
Keating, Edward J. Tue . "Engine with exhaust gas recirculation system and variable geometry turbocharger". United States. doi:. https://www.osti.gov/servlets/purl/1351821.
@article{osti_1351821,
title = {Engine with exhaust gas recirculation system and variable geometry turbocharger},
author = {Keating, Edward J.},
abstractNote = {An engine assembly includes an intake assembly, an internal combustion engine defining a plurality of cylinders and configured to combust a fuel and produce exhaust gas, and an exhaust assembly in fluid communication with a first subset of the plurality of cylinders. Each of the plurality of cylinders are provided in fluid communication with the intake assembly. The exhaust assembly is provided in fluid communication with a first subset of the plurality of cylinders, and a dedicated exhaust gas recirculation system in fluid communication with both a second subset of the plurality of cylinders and with the intake assembly. The dedicated exhaust gas recirculation system is configured to route all of the exhaust gas from the second subset of the plurality of cylinders to the intake assembly. Finally, the engine assembly includes a turbocharger having a variable geometry turbine in fluid communication with the exhaust assembly.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Nov 03 00:00:00 EST 2015},
month = {Tue Nov 03 00:00:00 EST 2015}
}

Patent:

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  • A turbine assembly for a variable-geometry turbocharger includes a turbine housing defining a divided volute having first and second scrolls, wherein the first scroll has a substantially smaller volume than the second scroll. The first scroll feeds exhaust gas to a first portion of a turbine wheel upstream of the throat of the wheel, while the second scroll feeds gas to a second portion of the wheel at least part of which is downstream of the throat. Flow from the second scroll is regulated by a sliding piston. The first scroll can be optimized for low-flow conditions such that themore » turbocharger can operate effectively like a small fixed-geometry turbocharger when the piston is closed. The turbine housing defines an inlet that is divided by a dividing wall into two portions respectively feeding gas to the two scrolls, a leading edge of the dividing wall being downstream of the inlet mouth.« less
  • A recirculation duct with a check valve is connected to an exhaust duct communicating with the engine and a turbine of a turbocharger and an delivery duct communicating with the engine and compressor of the turbocharger. A branch duct is connected to the delivery tube upstream of the recirculation duct. In the branch duct, a control valve is provided for controlling a quantity of air flowing in the branch duct according to both a pressure in the exhaust duct and a pressure in the delivery duct downstream of the branch dust to lower the pressure in the delivery duct downstreammore » of the branch duct thereby recirculating part of the exhaust gas. The control valve is provided with a dashpot and push rods, and driven by an accelerator when the engine runs at high load. The dashpot damper a rapid movement of the control valve made by the accelerator.« less
  • This patent describes an exhaust gas recirculation apparatus for an internal combustion engine having an intake air passage and an exhaust gas passage connected thereto. The apparatus comprises: an exhaust gas recirculation passage connecting the exhaust gas passage to the intake air passage for recirculating the exhaust gas into the intake air passage; and a vacuum-operated exhaust gas recirculation control valve disposed in the exhaust gas recirculation passage for controlling the flow of the exhaust gas to be recirculated. The exhaust gas recirculation control valve comprises a diaphragm for receiving admitted operating vacuum such that the valve closes when themore » absolute value of the admitted operating vacuum is lower than the absolute value of a first predetermined vacuum value and opens when the absolute value of the admitted operating vacuum is higher than the absolute value of the first Predetermined vacuum value.« less
  • An exhaust gas recirculation control system which is adapted to control the valve opening of the exhaust gas recirculation valve so as to minimize the difference between a detected value of the valve opening of the above value and a command value determined as a function of operating conditions of the engine. The valve opening is corrected at a higher speed when the above difference has a larger absolute value, and at a lower speed when the difference has a smaller absolute value, to ensure prompt and accurate control of the exhaust gas recirculation quantity.
  • A turbocharged internal combustion engine includes a bypass manifold interconnecting intake and exhaust manifolds for recycling exhaust gases back to the engine to reduce oxides of nitrogen. A compressor in the intake manifold is driven by a turbine in the exhaust manifold to pressurize intake air for the engine. The bypass manifold is connected to the intake manifold in a manner so that recycled exhaust gas does not flow through the compressor, to thereby eliminate undesirable exhaust contaminant buildup in the compressor. The bypass manifold includes a one-way valve to prevent the pressurized intake manifold air from backflowing into themore » exhaust system during full load operation. A control system regulates the differential pressure between the intake and exhaust manifolds by monitoring engine operating parameters. When a predetermined pressure differential is established between the exhaust and intake manifolds, the bypass manifold valve opens to recycle exhaust gases.« less