Patent ID: 7493896
Filing Date: 2009-02-24
Classification: F02D,F02M,Y02T

Abstract:
1. A control system for an exhaust gas recirculation (EGR) system of an engine, comprising: a first sensor that senses fresh mass air flow; a second sensor that senses charge air flow, wherein said charge air flow is based on said fresh mass air flow and EGR exhaust flow; a calculation module that determines a difference between said fresh mass airflow and said charge air flow and generates an EGR valve control signal based on said difference; and a bypass module that controls a bypass valve based on an engine coolant temperature (Tcool) signal that indicates a temperature of an engine coolant and an EGR exhaust temperature (Texhaust) signal that indicates a temperature of said EGR exhaust, wherein the bypass valve selectively directs a portion of said EGR exhaust through a bypass conduit.