Method and apparatus for exhaust gas recirculation control and power augmentation in an internal combustion engine
First Claim
1. An exhaust gas recirculation control and power augmentation system for an internal combustion engine having an intake manifold and an exhaust manifold comprising:
- a turbocharger having a compressor for supplying intake air to the intake manifold and a turbine which receives exhaust gas from the exhaust gas manifold to operate the compressor;
the turbine having an outlet coupled with a filter trap whereby exhaust gas exiting from the turbine will flow through the filter trap to substantially reduce particulate matter in the exhaust gas;
an exhaust gas recirculation line extending from the outlet of the filter trap to an electronically controlled diverter valve;
an intake air system having a first air flowline to supply intake air to the compressor of the turbocharger and a second air flowline to supply intake air to the electronically controlled diverter valve;
the electronically controlled diverter valve having a first inlet to receive recirculated exhaust gas from the exhaust gas recirculation line and a second inlet to receive intake air from the second air flowline;
the electronically controlled diverter valve having an outlet coupled with an electrically driven compressor whereby the electronically controlled diverter valve controls the volume and ratio of recirculated exhaust gas and intake air supplied to the electrically driven compressor; and
the electrically driven compressor having an outlet connected with the intake manifold to supply a mixture of recirculated exhaust gas and intake air to the intake manifold.
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Accused Products
Abstract
A system for controlling exhaust gas recirculation flow rates and power augmentation of a turbocharged internal combustion engine operating on diesel fuel or other fuels. Exhaust gas from the engine'"'"'s exhaust manifold is used to drive the turbocharger. Exhaust gas exiting from the turbocharger is directed through a filter trap. A first portion of the exhaust gas exiting the filter trap flows through an exhaust gas recirculation cooler to provide a first input to an electronically controlled diverter valve. Filtered intake air is supplied as a second input to the electronically controlled diverter valve. A mixed output of intake air and recirculated exhaust gas is directed from the diverter valve to an electrically driven compressor and then to the intake manifold of the diesel engine. The combination of the electronically controlled diverter valve and the electrically driven compressor controls both the exhaust gas recirculation flow rates and smoke limited power output at speeds below the peak torque speed of the associated engine. Above peak torque speeds, the turbocharger generally supplies all required intake air to the engine and the electrically driven compressor supplies only recirculated exhaust gas to control NOx emissions from the engine.
175 Citations
20 Claims
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1. An exhaust gas recirculation control and power augmentation system for an internal combustion engine having an intake manifold and an exhaust manifold comprising:
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a turbocharger having a compressor for supplying intake air to the intake manifold and a turbine which receives exhaust gas from the exhaust gas manifold to operate the compressor; the turbine having an outlet coupled with a filter trap whereby exhaust gas exiting from the turbine will flow through the filter trap to substantially reduce particulate matter in the exhaust gas; an exhaust gas recirculation line extending from the outlet of the filter trap to an electronically controlled diverter valve; an intake air system having a first air flowline to supply intake air to the compressor of the turbocharger and a second air flowline to supply intake air to the electronically controlled diverter valve; the electronically controlled diverter valve having a first inlet to receive recirculated exhaust gas from the exhaust gas recirculation line and a second inlet to receive intake air from the second air flowline; the electronically controlled diverter valve having an outlet coupled with an electrically driven compressor whereby the electronically controlled diverter valve controls the volume and ratio of recirculated exhaust gas and intake air supplied to the electrically driven compressor; and the electrically driven compressor having an outlet connected with the intake manifold to supply a mixture of recirculated exhaust gas and intake air to the intake manifold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An exhaust gas recirculation control and power augmentation system for a heavy-duty diesel engine having an intake manifold and an exhaust manifold comprising:
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a turbocharger having a compressor for supplying intake air to the intake manifold connected with a turbine which receives exhaust gas from the exhaust gas manifold to operate the compressor; the turbine having an outlet coupled with a filter trap whereby exhaust gas exiting from the turbine will flow through the filter trap to substantially reduce particulate matter in the exhaust gas; an exhaust gas recirculation line extending from the outlet of the filter trap to an electronically controlled diverter valve; an intake air filter having a first air flowline to supply intake air to the compressor of the turbocharger; a second air flowline extending from the intake air filter to supply intake air to the electronically controlled diverter valve; the electronically controlled diverter valve having a first inlet to receive recirculated exhaust gas from the exhaust gas recirculation line and a second inlet to receive intake air from the second air flowline; the electronically controlled diverter valve having an outlet coupled with an electrically driven compressor whereby the electronically controlled diverter valve controls the volume and ratio of recirculated exhaust gas and intake air supplied to the electrically driven compressor; and the electrically driven compressor having an outlet connected with the intake manifold to supply a mixture of recirculated exhaust gas and intake air to the intake manifold. - View Dependent Claims (12, 13, 14, 15)
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16. A method for controlling exhaust gas recirculation and power augmentation of a diesel engine having a turbocharger, an intake manifold and an exhaust manifold comprising:
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supplying intake air to a compressor portion of the turbocharger; supplying intake air to an electronically controlled diverter valve; directing exhaust gas from the exhaust gas manifold to a turbine portion of the turbocharger; filtering exhaust gas exiting from the turbine portion of the turbocharger and directing a first portion of the filtered exhaust gas to the electronically controlled diverter valve; mixing the first portion of the filtered exhaust gas with the intake air supplied to the electronically controlled diverter valve; directing the mixture of filtered exhaust gas and intake air from the electronically controlled diverter valve to an electrically driven compressor; discharging the mixture of filtered exhaust gas and intake air from the electrically driven compressor to the intake manifold; and adjusting the ratio of intake air and filtered exhaust gas exiting from the electronically controlled diverter valve based in part on the speed of the engine and desired NOx emission level. - View Dependent Claims (17, 18, 19, 20)
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Specification