A Method and System for Controlling An Internal Combustion Engine

A system 10 and method for monitoring a control system parameter determine a difference between a desired and estimated or measured parameter value, apply a weighting factor to the difference and select a control strategy based on the weighted difference. The weighting factor generally reflects the confidence in the accuracy of the parameter value determined by the parameter monitor and may be determined based on one or more engine or ambient operating conditions or parameters or may be based on statistical analyses of monitor values and/or control system parameter values.