EGR CONTROLLER FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To improve the EGR control accuracy of an internal combustion engine. SOLUTION: An ECR valve opening degree command value is changed by a predetermined amount when an engine is in a normal operation condition, and a first collector pressure change amount Pcol1 is calculated using parameters other than EGR valve opening degree (S3). A second collector pressure change amount Pcol2 is calculated due to a difference in pressure of collector pressure estimated values before and after it is changed by the predetermined amount in accordance with the EGR valve opening degree (S4). A compensation coefficient used in the estimate of EGR valve opening degree based on Pcol1 and Pcol2 is set after the EGR valve opening degree command value is returned to its original value (S6).