Patent ID: 6742335
Filing Date: 2004-06-01
Classification: F01N,F02B,F02M,Y02T

Abstract:
A method comprising:(A) exhausting gases from an exhaust manifold of a compression ignition engine; (B) separating a portion of said exhaust gases from the remainder of said exhaust gases under the control of an EGR valve; (C) removing particulates from at least said portion of said exhaust gases using an actively regenerated catalytic particulate trap; (D) cooling said portion of said exhaust gases; then (E) filtering said portion of said exhaust gases; then (F) mixing said portion of said exhaust gases with air in a venturi of an air induction system to form a mixture, said venturi generating a suction pressure of about 0.06 atmospheres and having a throat Mach Number of about 0.3 at an airflow rate through the venturi of about 60 lb/min.; and (G) directing said mixture into an intake manifold of said engine; (H) measuring (1) a temperature of said portion of said exhaust gases after said portion is cooled, (2) a temperature of said air, and (3) a temperature of said mixture; (I) calculating, based solely on the measuring step, a parameter indicative of a mass fraction of exhaust gases (mfegr) in said mixture; and (J) based on the calculating step, adjusting an EGR valve setting so as to adjust mfegr to at least approach a desired mfegr.