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US 2016/0237928 A1Published application
Systems and methods for controlling egr flow during transient conditions
AssigneeCummins Inc.
InventorsCarlos Alcides Lana, David J. Stroh, Samuel C. Geckler, Marten H. Dane, Anthony K. Perfetto, Karthik Kappaganthu, Govindarajan Kothandaraman
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Abstract
Systems, apparatus, and methods are disclosed that include a divided exhaust engine with at least one primary EGR cylinder and a plurality of non-primary EGR cylinders. The systems, apparatus and methods control the amount of recirculated exhaust gas in a charge flow in response to EGR fraction deviation conditions.
Claims41
A system comprising:
- an internal combustion engine having at least one primary exhaust gas recirculation (EGR) cylinder connected to provide an EGR flow to an EGR passage and a plurality of non-primary cylinders connected to provide an exhaust flow to an exhaust passage, wherein the EGR passage is connected to an intake system to provide an EGR flow from the at least one primary EGR cylinder to the intake system, the EGR passage being one of flow isolated and flow isolatable from the exhaust passage, wherein the intake system provides a charge flow to the at least one primary EGR cylinder and the plurality of non-primary cylinders, the charge flow including an intake air flow and an EGR fraction provided by an amount of recirculated exhaust gas from at least the at least one primary EGR cylinder;
- and
- a controller structured to interpret an EGR fraction deviation condition in which the EGR fraction provided by the amount of recirculated exhaust gas in the charge flow deviates from an expected EGR fraction, and in response to the EGR fraction deviation condition to adjust the amount of recirculated exhaust gas to the intake system toward the expected EGR fraction.
A method comprising:
- providing a charge flow to an internal combustion engine having at least one primary exhaust gas recirculation (EGR) cylinder connected to an EGR passage and a plurality of non-primary EGR cylinders connected to an exhaust passage;
- passing an exhaust flow from the non-primary EGR cylinders through the exhaust passage;
- passing an EGR flow from the at least one primary EGR cylinder through the EGR passage to an intake system, the charge flow including an EGR fraction corresponding to an amount of recirculated exhaust gas in the charge flow from at least the at least one primary EGR cylinder;
- determining an EGR fraction deviation condition in the charge flow to the internal combustion in engine in response to a deviation of the EGR fraction from an expected EGR fraction;
- and
- in response to determining the EGR fraction deviation condition, adjusting the amount of recirculated exhaust gas provided to the intake system to mitigate or reduce the deviation of the EGR fraction from the expected EGR fraction.
3 more elements
An apparatus, comprising:
- an internal combustion engine including a plurality of cylinders that receive a charge flow from an intake system, at least one of the plurality of cylinders being a primary exhaust gas recirculation (EGR) cylinder connected to the intake system to provide an EGR flow that mixes with an intake air flow to the plurality of cylinders, and remaining ones of the plurality of cylinders being connected to an exhaust system to provide an exhaust flow to an aftertreatment device of the exhaust system;
- a controller comprising:
- an EGR fraction determination module structured to determine an actual EGR fraction in the charge flow;
- an EGR fraction deviation condition module structured to determine an EGR fraction deviation condition in response to the actual EGR fraction and an expected EGR fraction;
- and
- an EGR fraction deviation condition mitigation module structured to output an EGR fraction deviation mitigation command in response to the EGR fraction deviation condition to at least one of a valve, a variable valve actuation mechanism, an intake throttle, and a fuel injector, wherein an amount of recirculated exhaust gas in the charge flow is adjusted in response to the EGR fraction deviation command.
3 more elements
Dependencies are inferred from the claim text.