A method and an apparatus for predicting intake manifold pressure are
presented, to compensate for a large lag or a large time delay without
producing an overshot or discontinuous behaviors of a predicted value.
The method comprises the step of obtaining a difference of values of a
variable to be predicted and a difference of values of another variable
ahead of the variable to be predicted. The method further comprises the
step of filtering the differences with adaptive filters. The method
further comprises the step of obtaining a predicted difference of values
of the variable to be predicted, through algorithm of estimation with
fuzzy reasoning. The method further comprises the step of adding the
predicted difference of values of the variable to be predicted, to a
current value of the variable to be predicted, to obtain a predicted
value of the variable to be predicted.