Honda Motor Co., Ltd.
EGR control apparatus and EGR control method for internal combustion engine

Abstract:

An EGR control apparatus for the engine includes an ECU. The ECU calculates a LP-side correction coefficient Kcor_LP and a HP-side correction coefficient Kcor_HP such that they include a LP-side FB correction value Dfb_LP and a HP-side FB correction value Dfb_HP that are calculated using equations (9) and (17) such that an absolute value of an EGR amount error E_egr is reduced, and a LP-side learned value CorMAP_LP/HP-side learned value CorMAP_HP learned when a LP ratio R_LP=1/R_LP=0 holds, calculates a target LP opening .theta._LP_dmd and a target HP opening .theta._HP_dmd using the LP-side correction coefficient Kcor_LP and the HP-side correction coefficient Kcor_HP, and controls a LP opening .theta._LP and a HP opening .theta._HP such that they become equal to the target LP opening .theta._LP_dmd and the target HP opening .theta._HP_dmd.