Patent ID: 6467270
Filing Date: 2002-10-22
Classification: F02B,F02D,Y02T

Abstract:
A system for exhaust gas recirculation in an internal combustion engine, comprising:an intake air manifold; an exhaust manifold; an exhaust gas recirculation passage providing fluid communication between said exhaust manifold and said intake air manifold; an exhaust gas recirculation valve positioned in said exhaust gas recirculation passage; a variable geometry turbine positioned downstream of said exhaust manifold; a wastegate passage providing fluid communication between said exhaust gas manifold and a point downstream of said variable geometry turbine so as to bypass flow around said variable geometry turbine; a wastegate valve positioned in said wastegate passage; and a control means for controlling exhaust gas recirculation through said exhaust gas recirculation passage by controlling a geometry of said variable geometry turbine and by controlling said wastegate valve; wherein said control of said geometry of said variable geometry turbine is independent of said control of said wastegate valve so as to avoid modulation of said exhaust gas recirculation valve.