Patent ID: 6776130
Filing Date: 2004-08-17
Classification: F01L

Abstract:
A control apparatus of a variable valve timing mechanism that changes a rotation phase of a camshaft relative to a crankshaft of an internal combustion engine by an actuator, comprising:a first sensor outputting a signal synchronized with the rotation of said crankshaft; a second sensor outputting a signal synchronized with the rotation of said camshaft; a phase detecting section that detects said rotation phase based on the signals from said first and second sensors; a controlled variable detecting section that detects controlled variable of said actuator; a conversion section that converts said controlled variable into the rotation phase with a transfer function representing said variable valve timing mechanism; an estimation value calculating section that calculates an estimation value of rotation phase based on the rotation phase detected by said phase detecting section and the rotation phase obtained by said conversion section; and a control section that outputs an operating signal to said actuator based on said estimation value and a desired value.