JPS63125145U

JPS63125145U -

Info

Publication number: JPS63125145U
Application number: JP1724987U
Authority: JP
Priority date: 1987-02-10
Filing date: 1987-02-10
Publication date: 1988-08-16

Description

[Brief explanation of the drawing]

第１図は本考案の構成図、第２図は本考案の一
実施例を示すシステム図、第３図は第２図の部分
詳細図、第４図は同上実施例における酸素センサ
の出力電圧特性を示すグラフ、第５図及び第６図
は同上実施例における燃料噴射量の増減補正制御
を示すフローチヤート、第７図は同上実施例にお
ける制御特性を示すタイムチヤート、第８図は従
来のアイドル空燃比制御を説明するためのフロー
チヤート、第９図は従来のアイドル空燃比調整装
置のシステム概略図、第１０図は三元触媒出口に
おける各種排気成分濃度と空燃比との関係を示す
グラフである。１……機関、８……燃料噴射弁、９……コント
ロールユニツト、１０……エアフローメータ、１
５……酸素センサ、２２……可変抵抗器。 Fig. 1 is a configuration diagram of the present invention, Fig. 2 is a system diagram showing an embodiment of the present invention, Fig. 3 is a partial detailed view of Fig. 2, and Fig. 4 is the output voltage of the oxygen sensor in the same embodiment. Graphs showing the characteristics, FIGS. 5 and 6 are flowcharts showing the increase/decrease correction control of the fuel injection amount in the above embodiment, FIG. 7 is a time chart showing the control characteristics in the above embodiment, and FIG. 8 is the conventional control. A flowchart for explaining idle air-fuel ratio control, FIG. 9 is a system schematic diagram of a conventional idle air-fuel ratio adjustment device, and FIG. 10 is a graph showing the relationship between various exhaust component concentrations and air-fuel ratio at the three-way catalyst outlet. It is. 1... Engine, 8... Fuel injection valve, 9... Control unit, 10... Air flow meter, 1
5... Oxygen sensor, 22... Variable resistor.

Claims

[Scope of utility model registration request]

An electronically controlled fuel injection system comprising a fuel injection amount setting means for setting a fuel injection amount based on an engine operating state, and a fuel injection valve drive control means for driving and controlling a fuel injection valve according to the set fuel injection amount. In the internal combustion engine, an increase/decrease correction amount adjusting means for externally adjusting an increase/decrease correction amount of the fuel injection amount in an engine idling operating state, and a fuel injection amount setting means synchronized with the adjustment of the increase/decrease correction amount by the increase/decrease correction amount adjusting means. an adjustment increase/decrease correction setting means for increasing/decreasing the fuel injection amount set by according to the adjusted increase/decrease correction amount; and detecting the air-fuel ratio of the engine intake air-fuel mixture based on the engine exhaust component concentration. The increase/decrease correction is performed when the air-fuel ratio detected by the air-fuel ratio detection means coincides with the target air-fuel ratio in the engine idling operating state when the air-fuel ratio detection means and the adjustment adjustment increase/decrease correction setting means increase or decrease the fuel injection amount. an increase/decrease correction amount storage means for storing an increase/decrease correction amount by the amount adjustment means; and a fuel injection set by the fuel injection amount setting means in an engine idle operating state other than when the increase/decrease correction amount is adjusted by the increase/decrease correction amount adjustment means. An idle air-fuel ratio adjustment device for an electronically controlled fuel injection type internal combustion engine, comprising: idle increase/decrease correction setting means for increasing/decreasing the amount according to a stored increase/decrease correction amount.