EXHAUST GAS RECIRCULATION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE,申请号JP20080148876-传众专利搜索

EXHAUST GAS RECIRCULATION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

申请公布号：JP2008248888(A)

申请号：JP20080148876

申请日期：2008.06.06

申请公布日期：2008.10.16

申请人：

KOMATSU LTD

发明人：TSUJI MASAFUMI;ONODERA YASUYUKI;KANZAKI YOSHIKI;JINBO TADASHI

分类号：F02D21/08;F02D41/02;F02D43/00;F02M25/07

主分类号：F02D21/08

摘要：PROBLEM TO BE SOLVED: To control recirculation ratio by reducing NO<SB>x</SB>, reducing soot and balancing engine output and fuel consumption, in an internal combustion engine having an exhaust gas recirculation circuit. SOLUTION: In the exhaust gas recirculation control device for the internal combustion engine, a control part 33 is provided to control a first opening and closing valve 15c for opening and closing an exhaust gas recirculation control circuit and a second opening and closing valve 12d for opening and closing an intake air bypass circuit 12c so that an EGR (exhaust gas recirculation) ratio and an air-fuel ratio achieve respective target values stored in a memory means 32 in accordance with a rotation speed, a load, an oxygen concentration in inlet air and an oxygen concentration in exhaust gas detected by a detection means 31. COPYRIGHT: (C)2009,JPO&INPIT