Patent ID: 7269950

Claim:
A turbocharger using the energy contained in an exhaust flow to compress an intake flow, the turbocharger comprising: a turbine comprising a turbine wheel surrounded by at least two scrolls, the at least two scrolls each shaped to direct and deliver the exhaust flow supplied thereto directly against the turbine wheel to cause rotation thereof; a channel to conduct the exhaust flow; a director selectively moving through a range of motion bounded by a first position, wherein the director forms a wall of the channel to gradually converge the exhaust flow substantially exclusively into one of the at least two scrolls, and a second position, wherein the director is withdrawn substantially completely from within the exhaust flow, the range of motion including an intermediate position located between the first and second positions; a bypass providing a conduit bypassing the turbine; the director in the first position, in the intermediate position, and in all positions therebetween covering the bypass and resisting entrance of the exhaust flow into the bypass; the director in the intermediate position being out of the channel, leaving the channel unobstructed to conduct the exhaust flow substantially exclusively into the at least two scrolls; the director in the second position exposing the bypass and permitting entrance of exhaust flow into the bypass; and a compressor driven by the turbine.