CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

In this apparatus, maintaining control (time t1 to t2) which instructs fixing of the open timing VVT of an intake valve is executed in a predetermined low load state. Subsequently, there are executed changing control which instructs changing of the open timing VVT by a predetermined amount (time t2), and maintaining control which again instructs fixing of the open timing VVT of the intake valve (time t2 to t3). An intake-valve control apparatus is determined to be "anomalous" when an change amount ”ave (= ave2 - ave1) between the average ave1 of a large number of sample values of ”MFB² (combustion percentage increase amount within a predetermined crank angle range in an expansion stroke) during the maintaining control before execution of the changing control and the average ave2 of a large number of sample values of ”MFB² during the maintaining control after execution of the changing control is less than a predetermined value C.