Supercharged internal combustion engine, and method for operating an internal combustion engine of said type
AssigneeFord Global Technologies, LLC
InventorsKai Sebastian Kuhlbach, Norbert Andreas Schorn, Rainer Friedfeldt, Guenter Bartsch
Life of this patent
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Abstract
A supercharged internal combustion engine having at least two exhaust-gas turbochargers is provided. The engine includes a first exhaust manifold and a second exhaust manifold which are permanently connected to one another upstream of the two turbines of the turbochargers via at least one connecting duct which cannot be closed off. In this way, overflow of exhaust from the one exhaust manifold may be transferred to the other exhaust manifold.
Claims18
A supercharged internal combustion engine, comprising:
- at least one cylinder head with at least two cylinders, wherein each cylinder has at least two outlet openings for discharging exhaust gases, at least one of which outlet openings is designed as an activatable outlet opening, and each outlet opening is adjoined by an exhaust line having a smallest cross section ACross,Ex;
- a first exhaust manifold in which the exhaust lines of the activatable outlet openings of the at least two cylinders merge, to form a first overall exhaust line which is connected to a turbine of a first exhaust-gas turbocharger;
- a second exhaust manifold in which the exhaust lines of the other outlet openings of the at least two cylinders merge, to form a second overall exhaust line which is connected to a turbine of a second exhaust-gas turbocharger,
- wherein the first exhaust manifold and the second exhaust manifold are permanently connected to one another upstream of the two turbines via at least one connecting duct which is permanently open, wherein the at least one connecting duct is integrated into the cylinder head, and wherein a smallest cross section ACross,C of the at least one connecting duct is smaller than ACross,Ex;
- and
- a bypass line connecting the first exhaust manifold to the second exhaust manifold including a shut off element arranged in the bypass line, the bypass line positioned downstream of the cylinder head and upstream of the first exhaust-gas turbocharger and the second exhaust-gas turbocharger.
An engine system, comprising:
- at least one cylinder head with at least two in-line cylinders, each cylinder having a first and second exhaust port, each exhaust port adjoined by an exhaust line having a smallest cross section ACross,Ex;
- a first integrated exhaust manifold directing exhaust from the first exhaust port of each cylinder to a first turbocharger;
- a second integrated exhaust manifold directing exhaust from the second exhaust port of each cylinder to a second turbocharger;
- and
- a connecting duct coupling the first and second integrated exhaust manifolds upstream of the first and second turbochargers,
- wherein the connecting duct is integrated into the cylinder head, and wherein a smallest cross section ACross,C of the connecting duct is smaller than ACross,Ex.
A method for an engine having a first and second turbocharger, comprising:
- directing exhaust gas from the engine to the first turbocharger via a first integrated exhaust manifold;
- and
- during select conditions,
- directing a first portion of the exhaust gas via the first integrated exhaust manifold to the second turbocharger via a permanently open connecting line integrated in a cylinder head, and
- directing a second portion of the exhaust gas via a second integrated exhaust manifold to the second turbocharger,
- wherein a smallest cross section ACross,C of the connecting line is smaller than a smallest cross section ACross,Ex of an exhaust line.
Dependencies are inferred from the claim text.