Patent ID: 8342015
Filing Date: 2013-01-01
Classification: F02M,G01M

Abstract:
1. A method of diagnosing a failure of an EGR circuit of an engine including an EGR exchanger, an EGR valve, a bypass duct of the EGR exchanger, and a bypass flap, arranged upstream of the EGR exchanger and upstream of the bypass duct to control a proportion of exhaust gases passing through the bypass duct, wherein the EGR circuit can be activated according to a cooled mode, in which the flap is closed, and a bypass mode, in which the flap is open, the method comprising: carrying out, during a diagnosis phase, first and second activations of the flap; and measuring an average of variations of a temperature of the EGR gases at an outlet of the EGR exchanger during the diagnosis phase.