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%.
Claims20
A piston for an internal combustion engine, the piston comprising:
- a bowl machined into a top surf of the piston, the bowl comprising a flat bottom and a salient angle between the top surface of the piston and a side of the bowl, an opening diameter, and a depth;
- wherein the salient angle of the bowl ranges approximately from 10 to 25 degrees and the ratio between the bowl opening diameter and the bowl depth ranges approximately from 0.5 to 2.0;
- and
- wherein the piston is configured to form a portion of a combustion chamber of the internal combustion engine.
A cylinder block comprising:
- at least one cylinder bore;
- and
- a piston positioned within the at least one cylinder bore and having a bowl machined into a top surface of the piston, the bowl comprising a bottom, a salient angle between the top surface of the piston and a side of the bowl, an opening diameter, and a depth,
- wherein the salient angle of the bowl ranges approximately from 10 to 25 degrees, the ratio between the bowl opening diameter and the bowl depth ranges approximately from 0.5 to 2.0, and the depth is constant between the opening diameter and the bottom of the bowl;
- and
- wherein the piston is configured to form a portion of a combustion chamber of the internal combustion engine.
An internal combustion engine 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 at least one cylinder bore and having a bowl machined into a top surface of the piston, the bowl comprising a bottom, a salient angle between the top surface of the piston and a side of the bowl, an opening diameter, and a depth,
- wherein the salient angle of the bowl ranges approximately from 10 to 25 degrees, the ratio between the bowl opening diameter and the bowl depth ranges approximately from 0.5 to 2.0, and the depth is constant between the opening diameter and the bottom of the bowl;
- and
- wherein the piston is configured to form a portion of a combustion chamber of the internal combustion engine.
Dependencies are inferred from the claim text.