Patent ID: 6708676
Filing Date: 2004-03-23
Classification: F02D,Y02T

Abstract:
An EGR control unit comprising:an EGR passage for making a communication between an exhaust passage and an intake passage in an internal combustion engine; an EGR adjusting device including at least an EGR valve for opening and closing said EGR passage and drive means for driving said EGR valve; temperature detecting means for detecting in-passage temperature of at least two passages of said intake passage, an atmospheric air introduction passage located on an upstream side of said intake passage and communicated with the atmosphere and said EGR passage; actual EGR rate calculating means for calculating a rate of an exhaust gas to an intake gas to said internal combustion engine on the basis of detection information from said temperature detecting means; and EGR control means for controlling said EGR adjusting device through the use of the actual EGR rate calculated by said actual EGR rate calculating means.