Turbocharged combustion system

Patent metadata

Field	Value
Publication number	US-10316741-B2
Application number	US-90422210-A
Country	US
Kind code	B2
Filing date	Oct 14, 2010
Priority date	Oct 14, 2010
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

An engine combustion system is disclosed which includes: a cylinder head having at least two cylinders; an exhaust duct adjoining each cylinder with the exhaust ducts of at least two cylinders converging to form an exhaust manifold within the cylinder head and two turbines arranged downstream of the exhaust manifold. In one embodiment, the two turbines are arranged in parallel with a control element disposed upstream of one of the turbines to close off flow to the one turbine. Alternatively, a first of the turbines has a first bypass duct having a first valve. Flow exiting the turbine and the bypass path converge and are provided to a second of the turbines that has a second bypass duct having a second valve. By controlling positions of each valve, flow can be provided solely to the associated turbine, the associated bypass duct, or a combination.

First claim

What is claimed:

1. An engine combustion system having a cylinder head with at least two cylinders and an exhaust duct adjoining each cylinder with the exhaust ducts of at least two cylinders converging to form an exhaust manifold within the cylinder head, the combustion system comprising:
a first turbine disposed downstream of the exhaust manifold and arranged in a housing;
a first bypass duct positioned upstream of where the at least two cylinders converge to form the exhaust manifold within the cylinder head and arranged in parallel flow relationship with the first turbine and extending from the cylinder head into the housing wherein an outlet from the first turbine converges with an outlet from the first bypass duct in a combined duct;
a first control element disposed in the first bypass duct controlling a proportion of exhaust flow allowed to bypass the first turbine, wherein the first control element is configured to open responsive to exhaust flow being below a predetermined level; and
a second turbine arranged in the housing downstream of the combined duct.

2. The system of claim 1 , further comprising:
a second bypass duct arranged in parallel flow relationship with the second turbine and disposed in the housing; and
a second control element disposed in the second bypass duct controlling a proportion of exhaust flow allowed to bypass the second turbine.

3. The system of claim 2 wherein the first control element is one of a poppet valve and a butterfly valve, and the second control element is one of a poppet valve and a butterfly valve.

4. The system of claim 1 wherein the housing is a separate element coupled to the exhaust manifold.

5. The system of claim 1 , further comprising:
an electronic control unit electronically coupled to the engine, engine sensors, and the first control element wherein the electronic control unit commands the first control element to open when exhaust flow is below a predetermined level.

6. A method to control an engine combustion system, comprising:
commanding, by a controller, a first valve to be fully open when exhaust flow is less than a predetermined level wherein the engine combustion system includes:
a cylinder head having at least two cylinders;
an exhaust duct adjoining each cylinder with the exhaust ducts of the at least two cylinders converging to form an exhaust manifold within the cylinder head;
a first turbine arranged in a housing coupled to the cylinder head;
a first bypass duct arranged in parallel flow relationship with the first turbine and having an inlet upstream of where the exhaust ducts of the at least two cylinders converge to form the exhaust manifold within the cylinder head and an outlet disposed in the housing wherein an outlet from the first turbine converges with the outlet from the first bypass duct in a combined duct, wherein the first control element is disposed in the first bypass duct for controlling a proportion of exhaust flow allowed to bypass the first turbine; and
a second turbine arranged in the housing downstream of the combined duct.

7. The method of claim 6 wherein the combustion system further includes a second bypass duct arranged in parallel flow relationship with the second turbine and disposed in the housing and a second valve disposed in the second bypass duct controlling a proportion of exhaust flow allowed to bypass the second turbine, the method further comprising:
commanding, by the controller, the second valve to a closed position at an exhaust flow level lower than the predetermined level.

8. An engine combustion system, comprising:
a cylinder head having an integrated exhaust manifold where exhaust ducts of at least two cylinders converge; and
a housing having:
a first turbine downstream of the integrated exhaust manifold;
a bypass duct disposed upstream of where the exhaust ducts of the at least two cylinders converge and in parallel flow relationship with the first turbine;
a combined duct combining flow from the first turbine and the bypass duct;
a valve in the bypass duct that opens responsive to exhaust flow being below a predetermined level; and
a second turbine downstream of the combined duct.

Assignees

• Kuhlbach Kai Sebastian
• Borrmann Dirk
• Friedfeldt Rainer
• Ford Global Tech Llc

Inventors

• Kuhlbach Kai Sebastian
• Borrmann Dirk
• Friedfeldt Rainer

Classifications

• F02F1/243

  Cylinder heads and inlet or exhaust manifolds integrally cast together · CPC title

• F02B37/18 Primary

  by bypassing exhaust {from the inlet to the outlet of turbine or to the atmosphere} · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F02B37/004

  with exhaust drives arranged in series · CPC title

• F02B67/10

  of charging or scavenging apparatus · CPC title