Systems and methods for engine control
First Claim
1. A method for controlling exhaust gas recirculation (EGR) rate in an internal combustion engine, comprising:
- with a controller, routing at least a portion of exhaust from a first exhaust manifold to an air intake manifold coupled to the engine, and not to atmosphere, the first exhaust manifold exclusively coupled to a first cylinder group;
with the controller, routing exhaust from at least one additional exhaust manifold coupled to a corresponding at least one additional cylinder group to atmosphere; and
with the controller, during a first engine operating condition where an engine fuel demand is below a threshold demand, not injecting fuel to each of a subset of cylinders in the first cylinder group while injecting fuel to a subset of all cylinders coupled to the at least one additional exhaust manifold, where a number of cylinders of the subset of cylinders in the first cylinder group decreases in response to an increase in a target EGR rate.
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Accused Products
Abstract
Various methods for controlling EGR rate are disclosed. In one embodiment, a method comprises routing at least a portion of exhaust from a first exhaust manifold to an intake manifold, and not to atmosphere, the first exhaust manifold exclusively coupled to a first cylinder group. The method further includes routing exhaust from at least one additional exhaust manifold coupled to a corresponding at least one additional cylinder group to atmosphere, and during a first engine operating condition where an engine fuel demand is below a threshold demand, not injecting fuel to each of a subset of cylinders in the first cylinder group while injecting fuel to a subset of all cylinders coupled to the at least one additional exhaust manifold, where a number of cylinders of the subset of cylinders in the first cylinder group decreases in response to an increase in a target EGR rate.
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Citations
20 Claims
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1. A method for controlling exhaust gas recirculation (EGR) rate in an internal combustion engine, comprising:
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with a controller, routing at least a portion of exhaust from a first exhaust manifold to an air intake manifold coupled to the engine, and not to atmosphere, the first exhaust manifold exclusively coupled to a first cylinder group; with the controller, routing exhaust from at least one additional exhaust manifold coupled to a corresponding at least one additional cylinder group to atmosphere; and with the controller, during a first engine operating condition where an engine fuel demand is below a threshold demand, not injecting fuel to each of a subset of cylinders in the first cylinder group while injecting fuel to a subset of all cylinders coupled to the at least one additional exhaust manifold, where a number of cylinders of the subset of cylinders in the first cylinder group decreases in response to an increase in a target EGR rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system, comprising:
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an air intake manifold coupled to an engine configured to combust fuel; a first exhaust manifold exclusively coupled to a first cylinder group of the engine; at least one additional exhaust manifold coupled to a corresponding at least one additional cylinder group of the engine; a controller configured to; route at least a portion of exhaust from the first exhaust manifold to the air intake manifold; route exhaust from the at least one additional exhaust manifold to atmosphere; and during a first engine operating condition where an engine fuel demand is below a threshold demand, not inject fuel to each of a subset of cylinders in the first cylinder group while injecting fuel to all cylinders coupled to the at least one additional exhaust manifold, where a number of cylinders of the subset of cylinders in the first cylinder group decreases in response to an increase in a target EGR rate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification