DUAL FUEL SYSTEMS AND METHODS WITH ADVANCED EXHAUST GAS RECIRCULATION
First Claim
Patent Images
1. A method, comprising:
- operating an internal combustion engine including a plurality of cylinders, an exhaust system, and an intake system, at least one of the plurality of cylinders being a primary exhaust gas recirculation (EGR) cylinder operably connected to provide exhaust flow to an exhaust gas recirculation (EGR) system and a remaining portion of the plurality of cylinders being operably connected to provide exhaust flow to the exhaust system, and further comprising a first fuel source that is connected to each of the plurality of cylinders and a second fuel source connected at least to the at least one primary EGR cylinder;
providing a first fuel flow only from the first fuel source to each of the plurality of cylinders in response to a first load condition of the internal combustion engine; and
in response to a second load condition of the internal combustion engine that is one of a low load condition and a high load condition, providing a second fuel flow from the second fuel source to the at least one primary EGR cylinder while providing the first fuel flow to each of the plurality of cylinders, wherein the first load condition is between the low load condition and the high load condition.
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Abstract
Systems and methods for fuelling a plurality of cylinders of an internal combustion engine are disclosed. The system includes an exhaust gas recirculation system for recirculating exhaust gas flow from at least one primary EGR cylinder of an engine into an intake system prior to combustion. The system further includes a fueling system to provide a first flow of a first fuel to each of the plurality of cylinders and a second flow of a second fuel to each of the primary EGR cylinders that is in addition to the first flow of the first fuel.
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Citations
31 Claims
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1. A method, comprising:
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operating an internal combustion engine including a plurality of cylinders, an exhaust system, and an intake system, at least one of the plurality of cylinders being a primary exhaust gas recirculation (EGR) cylinder operably connected to provide exhaust flow to an exhaust gas recirculation (EGR) system and a remaining portion of the plurality of cylinders being operably connected to provide exhaust flow to the exhaust system, and further comprising a first fuel source that is connected to each of the plurality of cylinders and a second fuel source connected at least to the at least one primary EGR cylinder; providing a first fuel flow only from the first fuel source to each of the plurality of cylinders in response to a first load condition of the internal combustion engine; and in response to a second load condition of the internal combustion engine that is one of a low load condition and a high load condition, providing a second fuel flow from the second fuel source to the at least one primary EGR cylinder while providing the first fuel flow to each of the plurality of cylinders, wherein the first load condition is between the low load condition and the high load condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method, comprising:
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producing a flow of exhaust from a plurality of cylinders of an internal combustion engine into an exhaust system of the internal combustion engine; directing the flow of exhaust created by combustion in a portion of the plurality of cylinders that are primary exhaust gas recirculation (EGR) cylinders to an exhaust gas recirculation system to mix with an intake flow to the plurality of cylinders for combustion by the plurality of cylinders; directing the flow of exhaust created by combustion in a remaining portion of the plurality of cylinders to an exhaust outlet, wherein the remaining portion of the plurality of cylinders do not include the primary EGR cylinders; determining a load condition of the internal combustion engine; and providing a first flow of fuel from a first fuel source to each of the plurality of cylinders in conjunction with providing a second flow of fuel from a second fuel source connected to each of the primary EGR cylinders in response to the load condition of the internal combustion engine being one of less than a low load threshold and greater than a high load threshold. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A system, comprising:
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an engine including a plurality of cylinders; an intake system configured to direct a charge flow to all of the plurality of cylinders; an exhaust system configured to receive exhaust from a first portion of the plurality of cylinders and outlet the exhaust to atmosphere; an exhaust gas recirculation system configured to receive exhaust from only a second portion of the plurality of cylinders and direct the exhaust from the second portion of the plurality of cylinders to the intake system; a fuel system including a first fuel source that is connected to each of the plurality of cylinders, a second fuel source that is connected to the second portion of the plurality of cylinders; and a controller connected to the engine and the fuel system, wherein the controller is configured to determine a load condition of the engine and in response to the load condition being one of greater than a high load threshold and less than a low load threshold, provide a first fuel flow from the first fuel source to each of the plurality of cylinders while providing a second fuel flow from the second fuel source to at least the second portion of the plurality of cylinders. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31)
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Specification