Cam phase control apparatus and method

摘要

A cam phase control apparatus (1) for an internal combustion engine (3) is provided for improving the controllability in a transient state in which an actual cam phase converges to a target cam phase to accurately and readily identify model parameters even when a mechanism for changing the actual cam phase exhibits an intense friction characteristic. The cam phase control apparatus (1) relies on a sliding mode control algorithm which models a controlled object that receives the control input (DUT) to a cam phase varying device (10) and outputs an actual cam phase (CAIN) as a discrete time based model (eq.(1)), and creates a switching function Ã(k) as a function (eq.(11)) of time series data of a following error (e). An ECU (2) functions as a sliding mode controller for determining the control input (DUT) to the cam phase varying device (10) at a predetermined control period (”T) for converging the actual cam phase (CAIN) to a target cam phase (CAIMCMD).