Patent ID: 6125830
Filing Date: 2000-10-03
Classification: F02D,Y02T

Abstract:
A system for controlling an exhaust gas recirculation flow from an engine exhaust to an engine intake manifold, the system comprising,a flow control valve through which the exhaust gas recirculation flow passes after exiting the exhaust;a fixed area orifice through which the exhaust gas recirculation flow passes after exiting said flow control valve before entering the engine intake manifold; anda controller for generating a differential pressure signal indicating a differential pressure across the fixed area orifice, the controller generating an estimated manifold pressure based on a total gas charge inducted into the cylinder, calculating an exhaust gas recirculation flow based on said differential pressure signal and said estimated manifold pressure, the controller adjusting said valve based on said calculated exhaust gas recirculation flow and a desired exhaust gas recirculation flow.