Engine system for emission reduction without aftertreatment
AssigneeCummins Inc.
InventorsPhilipe F. Saad, Leon A. LaPointe, Premjee Sasidharan, Atsuhiko Watanabe
Life of this patent
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Abstract
An engine system comprising an internal combustion engine and a turbocharger, where a diameter of the at least one intake valve is greater than a diameter of the at least one exhaust valve, the salient angle of the piston bowl is at least 10 degrees, the ratio between the piston bowl opening diameter and the piston bowl depth is approximately 0.5 to 2.0, the intake valve opens before top dead center on an exhaust stroke of the internal combustion engine and closes before bottom dead center of an intake stroke of the internal combustion engine, and the turbocharger has a combined efficiency of more than 50%.
Claims19
An engine system, comprising:
- an internal combustion engine having:
- a cylinder head including at least one intake valve and at least one exhaust valve;
- a cylinder block positioned adjacent the cylinder head and comprising at least one cylinder bore;
- a piston positioned within the cylinder bore and having a bowl machined into a top surface of the piston, the bowl comprising a salient angle between the top surface of the piston and a side of the bowl, an opening diameter, and a depth;
- a combustion chamber defined by the cylinder head, the cylinder block, and the piston;
- and
- a high capability ignition system including an ignition device, an injector, and a pre-chamber;
- wherein a diameter of the at least one intake valve is greater than a diameter of the at least one exhaust valve, the salient angle of the piston bowl is at least 10 degrees, the ratio between the piston bowl opening diameter and the piston bowl depth is approximately 0.5 to 2.0, and the intake valve is configured to open before top dead center on an exhaust stroke of the internal combustion engine and close before bottom dead center of an intake stroke of the internal combustion engine;
- and
- a turbocharger having a compressor configured to provide compressed air to the internal combustion engine, and a turbine,
- wherein the turbocharger has a combined efficiency of more than 50%.
An internal combustion engine configured to couple to a turbocharger, comprising:
- a cylinder head including at least one intake valve and at least one exhaust valve;
- a cylinder block positioned adjacent the cylinder head and comprising at least one cylinder bore;
- a piston positioned within the cylinder bore and having a bowl machined into a top surface of the piston, the bowl comprising a salient angle between the top surface of the piston and a side of the bowl, an opening diameter, and a depth;
- and
- a combustion chamber defined by the cylinder head, the cylinder block, and the piston;
- wherein a diameter of the at least one intake valve is greater than a diameter of the at least one exhaust valve, the salient angle of the piston bowl is at least 10 degrees, the ratio between the piston bowl opening diameter and the piston bowl depth is approximately 0.5 to 2.0, and the intake valve is configured to open before top dead center on an exhaust stroke of the internal combustion engine and close before bottom dead center of an intake stroke of the internal combustion engine.
Dependencies are inferred from the claim text.