Method for exhaust gas recirculation rate control
First Claim
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1. A method for controlling EGR rate in an internal combustion engine, comprising:
- routing exhaust from a first cylinder group exclusively to an intake coupled to the engine, and not to atmosphere;
routing exhaust from a second cylinder group to atmosphere; and
during a first engine operating condition where an engine fuel demand is below a threshold demand, injecting fuel to each cylinder in the first cylinder group while injecting fuel to a subset of cylinders of the second cylinder group, where a number of cylinders of the subset of cylinders of the second cylinder group decreases in response to an increase in a target EGR rate.
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Abstract
Various methods for controlling EGR rate are disclosed. In one embodiment, a method for controlling EGR rate in an engine comprises routing exhaust from a first cylinder group to an intake coupled to the engine, and not to atmosphere, routing exhaust from a second cylinder group to atmosphere, and, during a first engine operating condition, injecting fuel to each cylinder in the first cylinder group while injecting fuel to a subset of cylinders of the second cylinder group.
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Citations
21 Claims
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1. A method for controlling EGR rate in an internal combustion engine, comprising:
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routing exhaust from a first cylinder group exclusively to an intake coupled to the engine, and not to atmosphere; routing exhaust from a second cylinder group to atmosphere; and during a first engine operating condition where an engine fuel demand is below a threshold demand, injecting fuel to each cylinder in the first cylinder group while injecting fuel to a subset of cylinders of the second cylinder group, where a number of cylinders of the subset of cylinders of the second 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 method of operating an internal combustion engine, comprising:
responsive to an effective exhaust gas recirculation (EGR) rate being below a target EGR rate, during a plurality of engine cycles, firing each cylinder from a first cylinder group more often than each cylinder from a second cylinder group, the first cylinder group comprising donor cylinders and the second cylinder group comprising non-donor cylinders. - View Dependent Claims (13, 14, 15, 16)
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17. A method for controlling an EGR rate, comprising:
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injecting fuel to each cylinder of a donor cylinder group; injecting fuel to a subset of cylinders of a non-donor cylinder group; and adjusting a number of cylinders of the subset of cylinders of the non-donor cylinder group based on a determined target EGR rate, including decreasing the number of cylinders in response to an increase in the determined target EGR rate. - View Dependent Claims (18, 19, 20)
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21. A method, comprising:
selectively skipping one or more non-donor cylinders in an engine having pluralities of both donor and non-donor cylinders based at least in part on a determined speed of the engine and a target EGR rate.
Specification