Patent ID: 6718252
Filing Date: 2004-04-06
Classification: F02D

Abstract:
A control apparatus for an internal combustion engine for feedback controlling an operation amount of an actuator driving a control object employed in the internal combustion engine by using a control model simulating the control object, said control apparatus comprising:a state detecting means for detecting a state of the control object; a state variation outputting means for outputting present and previous operation amounts as well as present and previous state detection values detected by said state detecting means as a state variable representing an internal state of the control model; a control parameter processing means for finding a control parameter by using model parameters of the control model; a correction value processing means for finding an operation amount correction value based on a difference between a control parameter found by said control parameter processing means and a state variable output by said state variation outputting means and a deviation of a detection value output by said state detecting means from a control target value; and an operation amount processing means for adding the operation amount correction value to a previous operation amount in order to find a present operation amount; wherein said control parameter processing means calculates coefficients of a characteristic polynomial of the control model by adoption of a pole-assignment method, and calculates the control parameter from the coefficients of the characteristic polynomial and the model parameters.