System and method for exhaust gas recirculation
First Claim
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1. A method for controlling an exhaust gas recirculation system of an internal combustion engine, the system including a first valve positioned to control flow through a first conduit and a second valve positioned to control flow through a second conduit, the first and second conduits both coupled to an intake manifold of the engine, the method comprising:
- positioning said first valve in response to a pressure in said first conduit and a pressure in said second conduit when said second valve is closed, said first valve controlling a first exhaust gas recirculation flow through the first conduit and into the intake manifold; and
positioning said second valve in response to a pressure in said second conduit and a pressure in said first conduit when said first valve is closed, said second valve controlling a second exhaust gas recirculation flow through the second conduit and into the intake manifold, said second flow higher than said first flow, wherein said first conduit includes a first orifice extending into the first conduit and wherein said second conduit includes a second orifice extending into the second conduit.
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Abstract
A system and method for controlling EGR of an internal combustion engine is presented. The system is capable of controlling EGR over a wide range of flow rates.
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Citations
14 Claims
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1. A method for controlling an exhaust gas recirculation system of an internal combustion engine, the system including a first valve positioned to control flow through a first conduit and a second valve positioned to control flow through a second conduit, the first and second conduits both coupled to an intake manifold of the engine, the method comprising:
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positioning said first valve in response to a pressure in said first conduit and a pressure in said second conduit when said second valve is closed, said first valve controlling a first exhaust gas recirculation flow through the first conduit and into the intake manifold; and positioning said second valve in response to a pressure in said second conduit and a pressure in said first conduit when said first valve is closed, said second valve controlling a second exhaust gas recirculation flow through the second conduit and into the intake manifold, said second flow higher than said first flow, wherein said first conduit includes a first orifice extending into the first conduit and wherein said second conduit includes a second orifice extending into the second conduit. - View Dependent Claims (2)
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3. A method for controlling an exhaust gas recirculation system of an internal combustion engine, the system including a first valve positioned to control flow through a first conduit and a second valve positioned to control flow through a second conduit, the first and second conduits both coupled to an intake manifold of the engine, the method comprising:
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positioning said first valve in response to a pressure in said first conduit and a pressure in said second conduit when said second valve is closed, said first valve controlling a first exhaust gas recirculation flow through the first conduit and into the intake manifold; and positioning said second valve in response to a pressure in said second conduit and a pressure in said first conduit when said first valve is closed, said second valve controlling a second exhaust gas recirculation flow through the second conduit and into the intake manifold, said second flow higher than said first flow, wherein said pressure in said first conduit and said pressure in said second conduit are determined by a single sensor.
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4. A system for controlling exhaust gas recirculation of an internal combustion engine, the system comprising:
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an intake manifold for directing air to at least a cylinder of the internal combustion engine; an exhaust manifold for directing exhaust gases from said at least a cylinder of said internal combustion engine; and an exhaust gas recirculation apparatus, said exhaust gas recirculation apparatus having at least a first orifice, located in and extending into a first conduit wherein the first conduit is located upstream of the intake manifold and coupled to the intake manifold, and at least a second orifice, located in and extending into a second conduit wherein the second conduit is located upstream of the intake manifold and coupled to the intake manifold, said second orifice having higher flow capacity than said first orifice, said exhaust gas recirculation apparatus having at least a first valve located in said first conduit and at least a second valve located in said second conduit, and said exhaust gas recirculation apparatus having at least a differential pressure sensing device having a first pressure sensing input positioned in said first conduit and a second pressure sensing input positioned in said second conduit. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling exhaust gas recirculation in a path that is external to a cylinder of an internal combustion engine, the path including an exhaust gas recirculation system having first and second parallel conduits each coupled to an intake manifold of the engine, the first conduit including a first valve and a first orifice downstream of the first valve, the second conduit including a second valve and a second orifice downstream of the second valve, the method comprising:
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adjusting a position of the first valve during a first engine operating condition as a differential pressure varies, the differential pressure between a first pressure and a second pressure, the first pressure being between the first valve and the first orifice and the second pressure being between the second valve and the second orifice, while said second valve located in said second conduit is closed; and adjusting a position of said second valve during a second engine operating condition as the differential pressure varies, while said first valve is closed, wherein said differential pressure is determined by a device in a single package. - View Dependent Claims (13, 14)
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Specification