System for diagnosing fault conditions associated with an air handling system for an internal combustion engine

摘要

A system for diagnosing fault conditions associated with an air handling system for an internal combustion engine includes an air handling control mechanism responsive to a mechanism command to control fluid flow through an air handling system of an internal combustion engine. An engine controller is configured to compute predicted responses of a number of engine operating parameters each as a different function of the mechanism command, and to compute a corresponding number of correlation coefficients each as a function of one of the engine operating parameter signals and a corresponding one of the predicted responses. The controller is operable to diagnose a fault associated with the air handling control mechanism if at least some of the correlation coefficients are below a first threshold, and to diagnose a properly functioning air handling control mechanism if at least some of the correlation coefficients are above a second threshold.