Turbine regulating valve system

• US 8,490,395 B2
• Filed: 12/21/2010
• Issued: 07/23/2013
• Est. Priority Date: 12/14/2004
• Status: Expired due to Fees

• Current Assignee: BorgWarner Incorporated
• Original Assignee: BorgWarner Incorporated
• Inventors: Grissom, Thomas A., Delavan, Matthew B.
• Primary Examiner(s): Trieu, Thai Ba
• Application Number:
  US12/928,849
• Publication Number:
  US 20110094222A1
• Time in Patent Office: 945 Days
• Field of Search: 606/12, 606/02, 123/562
• US Class Current: 60/612
• CPC Class Codes: F02B 37/004 with exhaust drives arranged in series
• CPC Class Codes: F02B 37/013 with exhaust-driven pumps arranged in series
• CPC Class Codes: F02B 37/025 Multiple scrolls or multiple gas passages guiding the gas to the pump drive
• CPC Class Codes: F02B 37/16 by bypassing charging air
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/183 Arrangements of bypass valves or actuators therefor
• CPC Class Codes: F02B 37/22 by varying cross-section of exhaust passages or air passages , e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits F02B37/24 takes precedence
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A regulated two-stage turbocharger system is provided. The turbocharger system includes high-pressure and low-pressure turbochargers in communication with one another. The turbocharger system includes a valve system having valves that are independently controllable so as to selectively control the gas flow into the turbine portions of the high-pressure turbocharger and the low-pressure turbocharger. The valves are asymmetric with differing perimeters, diameters, and sizes with respect to one another.

Claims

1. A turbocharger system (100), comprising:

a high-pressure turbocharger unit (102) having a high-pressure turbine connected via a conduit (114) with an exhaust manifold (112);

a low-pressure turbocharger unit (104) having a low-pressure turbine,

wherein the low-pressure turbocharger unit (104) is operably associated with the high-pressure turbocharger unit (102);

wherein the low-pressure turbine of the low-pressure turbocharger unit (104) is connected in series via conduits (116a, 116b) with the high-pressure turbine of the high-pressure turbocharger unit (102) , and

wherein the low-pressure turbine has a discharge conduit (208) being in fluid communication to a waste gate;

a valve system (200, 300), including a first asymmetric valve (202), a second asymmetric valve (204), and a turbine bypass valve (300), to selectively meter a gas flow to the high-pressure turbine of the high-pressure turbocharger unit (104) such that in at least one mode of operation, the high-pressure turbine of the high-pressure turbocharger unit (102) is bypassed by the first asymmetric valve (202) and the second asymmetric valve (204),

wherein the first asymmetric valve (202) is connected to an exhaust manifold (112) by a first conduit (202a) and the second asymmetric valve (204) is connected to the exhaust manifold (112) by a second conduit (204a),

wherein the first asymmetric valve (202) and the second asymmetric valve (204) are in fluid communication with the low-pressure turbine of the low-pressure turbocharger unit (104) by conduits (206a, 206b and 116b) and wherein the conduits (116a, 116b) have a common connection with an end of the conduit (206b),

wherein the first asymmetric valve (202) and the second asymmetric valve (204) are in fluid communication with the discharge conduit (208) to bypass the high pressure turbine of the high-pressure turbocharger unit (102) and the low-pressure turbine of the low-pressure turbocharger unit (104) by fluid communication with the conduit (206a) receiving exhaust gas from the first asymmetric valve (202) and the second asymmetric valve (204) and then passing the exhaust gas into low-pressure turbocharger by turbine bypass conduits (300a, 300b), and wherein the conduits (206a, 300a) have a common connection branching off of another end of the conduit (206b);

wherein the conduit (206a) receiving the exhaust gas from the first asymmetric valve (202) and the second asymmetric valve (204) and then passing the exhaust gas through turbine bypass conduits (300a, 300b), and wherein the turbine bypass valve (300) connects said turbine bypass conduit (300a) with said turbine bypass conduit (300b); and

a control unit,

wherein;

at low engine speed and load conditions, the control unit closes the first asymmetric valve (202) and the second asymmetric (204), and the turbine bypass valve (300) to allow the exhaust gas to flow through the high-pressure turbine of the high-pressure turbocharger (102) with fluid communication of the high-pressure turbine of the high-pressure turbocharger (102) with the low-pressure turbine of the low-pressure turbocharger (104),

at an increase in engine speed and load, the control unit opens the first asymmetric valve (202) to allow the exhaust gas to flow to the low-pressure turbine of the low-pressure turbocharger unit (104) via the conduits (206a, 206b, 116b), and

at being reached maximum engine speed and load conditions, the control unit additionally opens the second asymmetric (204) and the turbine bypass valve (300) to allow the exhaust gas to proceed there through to essentially bypass the high-pressure turbocharger (102) and the low-pressure turbocharger (104) via the conduit (206a) receiving the exhaust gas from the first asymmetric valve (202) and the second asymmetric (204) and passing the exhaust gas into said bypass turbine conduits (300a, 300b) and said discharge conduit (208).