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US 11,454,180 B1Granted
Systems and methods for exhaust gas recirculation
AssigneeCummins Inc.
InventorsJason W. Mackey, Srikanth Aravamuthan, Michael Haas
Life of this patent
Estimating the term…
Abstract
A system and method of exhaust gas recirculation (EGR) in an internal combustion engine are provided. The EGR system includes a first EGR flow path and a second EGR flow path independent of the first EGR flow path that are each configured to recirculate high pressure exhaust from the exhaust system back to the engine intake system. The system includes a controller in operable communication with the EGR system configured to selectively control an amount of EGR flow through at least one of the first and second EGR flow paths.
Claims18
A system comprising:
- an internal combustion engine including a plurality of cylinders, an intake system for directing a charge flow to the plurality of cylinders, and an exhaust system for receiving exhaust from the plurality of cylinders and directing the exhaust out of the exhaust system;
- an exhaust gas recirculation (EGR) system for recirculating exhaust from the exhaust system, wherein the EGR system includes a first EGR flow path connected to the exhaust system and a second EGR flow path connected to the exhaust system at a separate junction from or at a common junction with the first EGR flow path, the second EGR flow path being independent of the first EGR flow path and each are configured to recirculate high pressure exhaust from the exhaust system to the intake system;
- and
- a controller in operable communication with the EGR system configured to selectively control an amount of EGR flow through at least one of the first and second EGR flow paths;
- wherein one of the first and second EGR flow paths includes and EGR cooler and the other of the first and second EGR flow paths does not include an EGR cooler.
2 more elements
A method comprising:
- operating an internal combustion engine, the internal combustion engine including a plurality of cylinders, an intake system for directing a charge flow to the plurality of cylinders, and an exhaust system for receiving exhaust from the plurality of cylinders and directing the exhaust out of the exhaust system;
- selecting, in response to at least one exhaust gas recirculation (EGR) parameter, at least one of a first EGR flow path and a second EGR flow path that are each high pressure exhaust flow paths connected to the exhaust system at a common junction or at separate junctions and the first EGR flow path and the second EGR flow path are independent of one another;
- and
- recirculating exhaust from the exhaust system through the selected at least one of the first and second EGR flow paths;
- wherein one of the first and second EGR flow paths includes an EGR cooler and the other of the first and second EGR flow paths does not include an EGR cooler.
2 more elements
Dependencies are inferred from the claim text.