Patent ID: 8307650

Claim:
A turbocharger system comprising: a first turbocharger; a second turbocharger larger than the first turbocharger; the first turbocharger comprising a first exhaust turbine situated in a first exhaust passage; the second turbocharger including a second exhaust turbine situated in said first exhaust passage downstream of said first exhaust turbine; an exhaust gas flow control valve including: an inlet port communicating with the first exhaust gas passage upstream of the first exhaust turbine; a first outlet port communicating with the first exhaust gas passage downstream of said first exhaust turbine but upstream of said second exhaust turbine; and a second outlet port communicating with said first exhaust gas passage downstream of said second exhaust turbine; wherein the exhaust gas flow control valve is operable to selectively permit or block flow through the first and second outlet ports; wherein the second port has a smaller maximum flow area than either the inlet port or the first outlet port.