Patent ID: 7426831

Claim:
A turbocharger system, comprising: a high-pressure turbocharger system, wherein the high-pressure turbocharger system includes a turbine portion; a low-pressure turbocharger system operably associated with the high-pressure turbocharger system, wherein the low-pressure turbocharger system includes a turbine portion having a first volute and a second volute formed therein, wherein the turbine portion of the high-pressure turbocharger system is in fluid communication with either the first volute or the second volute of the turbine portion of the low-pressure turbocharger system; a turbine regulating valve system having at least two valve members, said turbine regulating valve system operably associated with the turbine portion of the low-pressure turbocharger system, wherein the turbine regulating valve system is controlled by a control mechanism, and the turbine regulating valve system is selectively operable to meter an exhaust gas flow to the first or second volutes based on preselected operating conditions of the control mechanism; a turbine by-pass system operably associated with the low-pressure turbine portion, wherein the turbine by-pass system is selectively operable to cause at least a portion of the exhaust gas flow to by-pass the low-pressure turbine portion; and one of said at least two valve members is in fluid communication with either of said first or second volutes, and another of said at least two valve members is in fluid communication with said turbine by-pass system.