Fuel injection control device for engine,申请号US201113163912-传众专利搜索

Fuel injection control device for engine

申请公布号：US8958973(B2)

申请号：US201113163912

申请日期：2011.06.20

申请公布日期：2015.02.17

申请人：

Denso Corporation

发明人：Katsurahara Hiroshi;Fukasawa Osamu;Nakano Tomoaki;Yokoi Masahiro;Noguchi Kota;Koike Atsushi

分类号：F02B3/00;F02D41/40;F02D41/14

主分类号：F02B3/00

代理机构：

Nixon & Vanderhye P.C.

代理人：Nixon & Vanderhye P.C.

地址：Kariya JP

摘要：A fuel injection control device for an engine executes a split injection constructed by a fixed injection and a variable injection. A required injection amount of the fixed injection is set in a low range. A required injection amount of the variable injection is set in a high range. An injection amount in the high range is larger than that of the low range. The required injection amount of the variable injection is changed within the high range while the required injection amount of the fixed injection is fixed when a load of the engine is varied while the split injection is performed. An injection control characteristic is corrected based on an actual air-fuel ratio detected before the load is varied and an actual air-fuel ratio detected after the load is varied.

主权项：1. A fuel injection control device for an engine comprising: a fuel injection valve to inject fuel; an injection controller to control the fuel injection valve based on a required fuel injection amount corresponding to an operation state of the engine; and a correcting portion to correct an injection control characteristic of the fuel injection valve, wherein the correcting portion includes first means for executing a split injection in which a fuel injection amount required by a cylinder of the engine is injected separatedly between a fixed injection and a variable injection when a predetermined condition is satisfied, the first means setting a required injection amount of the fixed injection per injection in a low range in which an injection amount is small, the first means setting a required injection amount of the variable injection per injection in a high range in which an injection amount is larger than that of the low range,second means for changing the required injection amount of the variable injection per injection within the high range while the required injection amount of the fixed injection per injection is fixed when a load of the engine is varied while the split injection is performed, andthird means for correcting the injection control characteristic of the fuel injection valve based on an actual air-fuel ratio detected by a sensor before the load is varied and an actual air-fuel ratio detected by the sensor after the load is varied.