Exhaust system having parallel egr coolers
AssigneeElectro-Motive Diesel, Inc.
InventorSteven Dallas JOHNSON
Life of this patent
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Abstract
An exhaust system is disclosed for use with an engine. The exhaust system may have a first exhaust manifold associated with a first plurality of engine cylinders, and a second exhaust manifold associated with a second plurality of engine cylinders. The exhaust system may also have a first exhaust gas recirculation passage extending from the first exhaust manifold to the first plurality of engine cylinders, and a second exhaust gas recirculation passage extending from the first exhaust manifold to the second plurality of engine cylinders. The exhaust system may additionally have a first cooler located in fluid communication with the first exhaust gas recirculation passage, and a second cooler located in fluid communication with the second exhaust gas recirculation passage.
Claims20
An exhaust system for an engine, comprising:
- a first exhaust manifold associated with a first plurality of engine cylinders;
- a second exhaust manifold associated with a second plurality of engine cylinders;
- a first exhaust gas recirculation passage extending from the first exhaust manifold to the first plurality of engine cylinders;
- a second exhaust gas recirculation passage extending from the first exhaust manifold to the second plurality of engine cylinders;
- a first cooler located in fluid communication with the first exhaust gas recirculation passage;
- and
- a second cooler located in fluid communication with the second exhaust gas recirculation passage.
A power system, comprising:
- an engine block at least partially defining a first bank of cylinders and a second bank of cylinders;
- a first intake manifold mounted at a first side of the engine block and in fluid communication with the first bank of cylinders;
- a second intake manifold mounted at a second side of the engine block and in fluid communication with the second bank of cylinders;
- a first exhaust manifold mounted between the first and second banks of cylinders and in fluid communication with the first bank of cylinders;
- a second exhaust manifold mounted between the first and second banks of cylinders and in fluid communication with the second bank of cylinders;
- a high-pressure turbocharger fluidly connected to the second exhaust manifold and to the first and second intake manifolds;
- a first low-pressure turbocharger fluidly connected to the high-pressure turbocharger;
- a second low-pressure turbocharger fluidly connected to the high-pressure turbocharger;
- a first exhaust gas recirculation passage extending from the first exhaust manifold to the first intake manifold;
- a second exhaust gas recirculation passage extending from the first exhaust manifold to the second intake manifold;
- a first cooler mounted to a first side of the engine block below the first intake manifold and fluidly connected with the first exhaust gas recirculation passage;
- and
- a second cooler mounted to a second side of the engine block below the second intake manifold and fluidly connected with the second exhaust gas recirculation passage.
A method of handling exhaust from an engine, comprising:
- directing exhaust from a first plurality of engine cylinders to a turbocharger;
- directing a first flow of exhaust from a second plurality of engine cylinders back into the first plurality of engine cylinders;
- directing a second flow of exhaust from the second plurality of engine cylinders back into the second plurality of engine cylinders;
- cooling the first flow of exhaust;
- and
- cooling the second flow of exhaust separately from the first flow of exhaust.
Dependencies are inferred from the claim text.