Method for exhaust gas recirculation rate control
AssigneeGeneral Electric Company
InventorsOmowoleola Chukuwuemeka Akinyemi, Adam Klingbeil
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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.
Claims21
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.
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.
A method for controlling an EGR rate, comprising:
- 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.
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.
Dependencies are inferred from the claim text.