Turbocharger having balance valve, wastegate, and common actuator

A method of handling exhaust from an engine having a first plurality of combustion chambers and a second plurality of combustion chambers, the method comprising:

• receiving exhaust from the first plurality of combustion chambers;
• receiving exhaust from the second plurality of combustion chambers;
• directing exhaust received from the first and second pluralities of combustion chambers through a turbine, the turbine including a housing having a first volute and a second volute;
• moving a common actuator in a first direction by a first amount to actuate a first valve of a valve assembly to open a first port, thereby mixing exhaust received from the first plurality of combustion chambers with exhaust received from the second plurality of combustion chambers, the first port being provided in a first wall fluidly separating the first volute from the second volute;
• and
• moving the common actuator in the first direction by a second amount to actuate a second valve of the valve assembly to open a second port, thereby allowing exhaust received from the second plurality of combustion chambers to bypass the turbine, the second port being provided in a second wall fluidly separating the second volute from a common outlet of the turbine.

A power system, comprising:

• an engine having a first plurality of combustion chambers and a second plurality of combustion chambers;
• a first exhaust manifold configured to receive exhaust from only the first plurality of combustion chambers;
• a second exhaust manifold configured to receive exhaust from only the second plurality of combustion chambers;
• a turbocharger having:
• a turbine housing, the turbine housing including a first volute in fluid communication with the first exhaust manifold, a second volute having a greater flow capacity than the first volute and being in fluid communication with the second exhaust manifold, and a common outlet, and
• a turbine wheel configured to receive exhaust from the first and second volutes;
• a valve assembly including:
• a first valve configured to selectively fluidly communicate the first volute with the second volute at a location upstream of the turbine wheel, and
• a second valve configured to selectively fluidly communicate the second volute with the common outlet to bypass the turbine wheel;
• a single actuator configured to move the valve assembly;
• and
• a valve housing connected to the turbine housing and at least partially enclosing the first and second valves, the valve housing including:
• a first wall member separating a first compartment fluidly communicating with the first volute from a second compartment fluidly communicating with the second volute, and
• a second wall member separating the second compartment from the common outlet, the first valve being provided in the first compartment between the first and second walls.