Patent ID: 8051834

Claim:
A method for controlling a throttle valve and an EGR valve in internal combustion engine, the method comprising the steps of: measuring a fresh mass air flow value entering the internal combustion engine; determining an exhaust oxygen concentration set point ([O 2 ] spEM ) indicative of an oxygen concentration in an exhaust manifold; calculating an air reference value (Air reference ) as a function of the exhaust oxygen concentration set point ([O 2 ] spEM ); determining an oxygen concentration feedback value ([O 2 ] fdIM , [O 2 ] fdEM ) representative of an oxygen concentration in the internal combustion engine; obtaining a position information for the throttle valve by comparing the actual fresh mass air flow value and the air reference value (Air reference ); obtaining a position for the EGR valve by comparing the oxygen concentration feedback value ([O 2 ] fdIM , [O 2 ] fdEM ) and the oxygen concentration set point ([O 2 ] spEM ); and controlling the throttle valve according to the position information for the throttle valve and the position information for the EGR valve.