Patent ID: 8001783
Filing Date: 2011-08-23
Classification: F02B,F02D,Y02T,Y10T

Abstract:
1. A method for controlling the flow of exhaust gas generated by an internal combustion engine of an engine system, the engine system comprising a primary fluid conduit fluidly coupling an exhaust manifold to an exhaust outlet through a high pressure turbocharger and a low pressure turbocharger, and the engine system further comprising a secondary fluid conduit bypassing the high pressure turbocharger to fluidly couple the exhaust manifold to the exhaust outlet through the low pressure turbocharger, the method comprising: providing a single barrel valve having a rotatable portion, the rotatable portion comprising spaced-apart first and second flow passages formed therethrough, the first flow passage comprising an inlet communicable in fluid receiving communication with a first section of a primary fluid conduit and an outlet communicable in fluid providing communication with a second section of the primary fluid conduit, and the second flow passage comprising an inlet communicable in fluid receiving communication with a first section of a secondary fluid conduit and an outlet communicable in fluid providing communication with a second section of the secondary fluid conduit; rotating the rotatable portion into a first position to allow fluid to flow through the first flow passage to fluidly couple the first and second sections of the primary fluid conduit, and to prevent fluid flow through the second flow passage to fluidly decouple the first and second sections of the secondary fluid conduit, wherein the rotatable portion is rotated into the first position during periods of operation of the internal combustion engine resulting in at least one of a low pressure, low mass flow, and low velocity of exhaust gas within the primary fluid conduit; rotating the rotatable portion into a second position to allow fluid to flow through the second flow passage to fluidly couple the first and second sections of the secondary fluid conduit, and to prevent fluid flow through the first flow passage to fluidly decouple the first and second sections of the primary fluid conduit, wherein the rotatable portion is rotated into the second position during periods of operation of the internal combustion engine resulting in at least one of a high pressure, high mass flow, and high velocity of exhaust gas within the primary fluid conduit; and rotating the rotatable portion into any of various intermediate positions between the first and second positions to allow fluid to flow through both the first and second flow passages to fluidly couple the first and second sections of the primary and secondary fluid conduits, respectively, wherein the rotatable portion is rotated into the plurality of intermediate positions during periods of operation of the internal combustion engine resulting in at least one of exhaust gas within the primary fluid conduit having an intermediate pressure between the low and high pressures, exhaust gas within the primary fluid conduit having an intermediate mass flow between the low and high mass flows, and exhaust gas within the primary fluid conduit having an intermediate velocity between the low and high velocities.