Patent ID: 7658068
Filing Date: 2010-02-09
Classification: F01D,F01N,F02B,F02C,F02D,F05D,Y02T

Abstract:
1. A method comprising: operating a turbocharger including a variable geometry turbine having an inlet passage to the turbine with a fluid flow area, the fluid flow area having a normal size for an internal combustion engine operating in a normal operating range; reducing the size of the fluid flow area from the normal size to a reduced size for exhaust gas heating, wherein the reduced size comprises a width between about zero and 4 millimeters; bypassing a portion of the exhaust gas entering the inlet passage around the guide vanes of the variable geometry turbine; and wherein said reducing exposes a bypass fluid flow path to the exhaust gas within the inlet passage, and wherein the bypass fluid flow path is normally blocked when the fluid flow area is of the normal size.