Patent ID: 7140360
Filing Date: 2006-11-28
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A system for controlling a ratio of air and fuel supplied to an internal combustion engine, the system comprising: an air intake conduit fluidly coupled to an intake manifold of the engine, an exhaust gas recirculation (EGR) conduit fluidly coupled between an exhaust manifold of the engine and one of the air intake conduit and the intake manifold, an EGR valve disposed in-line with the EGR conduit, the EGR valve responsive to a valve control signal to control exhaust gas flow through the EGR conduit, a lambda sensor producing a lambda signal indicative of air-to-fuel ratio of exhaust gas produced by the engine, and a control circuit producing a desired mass air flow value and a desired air-to-fuel ratio value, the control circuit determining a first error value as a difference between the desired air-to-fuel ratio value and the lambda signal and determining an adjusted mass air flow value as a function of the desired mass air flow value and the first error value, the control circuit producing the valve control signal as a function of the adjusted mass air flow value.