公开(公告)号：US06644019B2

公开(公告)日：2003-11-11

申请号：US10080969

申请日：2002-02-22

申请人： Koji Morikawa ,  Makoto Kaneko ,  Jin Itoh ,  Youhei Saishu

发明人： Koji Morikawa ,  Makoto Kaneko ,  Jin Itoh ,  Youhei Saishu

IPC分类号： F01N300

CPC分类号： F02D41/1454 ,  F02B1/04 ,  F02B1/12 ,  F02B3/06 ,  F02B23/101 ,  F02B69/06 ,  F02B2023/102 ,  F02D13/0215 ,  F02D13/0265 ,  F02D41/006 ,  F02D41/3017 ,  F02D41/3035 ,  F02D2041/001 ,  F02D2041/3052 ,  Y02T10/18 ,  Y02T10/22

摘要： When an engine operates in a low and medium load area and in a low and medium speed area, the combustion mode is established to a compression ignition combustion and when the engine operates in other load and speed areas, the combustion mode is established to a spark ignition combustion. Further, when the compression ignition combustion is performed, the mixture is stratified in the combustion chamber and an ultra lean combustion is realized. As a result, both NOx reduction in an ultra lean condition and HC/CO reduction in an oxidation atmosphere can be obtained. On the other hand, when the spark ignition combustion is performed, a normal feedback control of air-fuel ratio activates a three-way catalyst to reduce HC, CO and NOx simultaneously.