JPS6325363U

JPS6325363U -

Info

Publication number: JPS6325363U
Application number: JP11929486U
Authority: JP
Priority date: 1986-08-01
Filing date: 1986-08-01
Publication date: 1988-02-19
Anticipated expiration: 2001-08-01
Also published as: JPH0524214Y2

Description

[Brief explanation of the drawing]

第１図は本考案の基本概念図、第２〜１５図は
本考案の一実施例を示す図であり、第２図はその
全体構成図、第３図はその酸素センサの分解斜視
図、第４図はその酸素センサの断面図、第５図は
その空燃比検出回路の回路図、第６図はそのセン
サ出力のタイミングチヤート、第７図はその空燃
比と検出電圧との関係を示す図、第８図はそのシ
リンダ空気量ＱＡＣＹＬの算出プログラムを示す
フローチヤート、第９図はそのスロツトル弁流路
面積Ａαのテーブルマツプ、第１０図はそのバイ
パス路面積ＡＢのテーブルマツプ、第１１図は総
流路面積Ａをエンジン回転数Ｎで除したＡ／Ｎと
エンジン回転数Ｎとをパラメータとする定常空気
量ＱＨのテーブルマツプ、第１２図はその遅れ係
数Ｋ２のテーブルマツプ、第１３図はそのインジ
エクタ空気量ＱＡｉｎｊの算出プログラムを示す
フローチヤート、第１４図はそのオフセツト値設
定のプログラムを示すフローチヤート、第１５図
はそのオフセツト後のセンサ出力特性図である。３３……酸素センサ、３４，５０……（空燃比
検出手段）、５０……コントロールユニツト（設
定手段）。 Fig. 1 is a basic conceptual diagram of the present invention, Figs. 2 to 15 are diagrams showing an embodiment of the present invention, Fig. 2 is an overall configuration diagram thereof, Fig. 3 is an exploded perspective view of the oxygen sensor, Fig. 4 is a cross-sectional view of the oxygen sensor, Fig. 5 is a circuit diagram of its air-fuel ratio detection circuit, Fig. 6 is a timing chart of its sensor output, and Fig. 7 shows the relationship between its air-fuel ratio and detected voltage. 8 is a flowchart showing the calculation program for the cylinder air amount QACYL, FIG. 9 is a table map of the throttle valve passage area Aα, FIG. 10 is a table map of the bypass passage area AB, and FIG. is a table map of the steady air amount QH with parameters A/N obtained by dividing the total flow area A by the engine speed N and the engine speed N, FIG. 12 is a table map of the delay coefficient K2, and FIG. 13 14 is a flowchart showing a program for calculating the injector air amount QAinj, FIG. 14 is a flowchart showing a program for setting the offset value, and FIG. 15 is a characteristic diagram of the sensor output after the offset. 33...oxygen sensor, 34, 50... (air-fuel ratio detection means), 50... control unit (setting means).

Claims

[Scope of Claim for Utility Model Registration] (a) Based on a comparison between a pump cell that is supplied with a pump current that correlates to the oxygen concentration in the exhaust gas and whose pump voltage suddenly changes around the stoichiometric air-fuel ratio, and a predetermined reference gas. (b) When the pump voltage of the oxygen sensor is in a sudden change state, the average value of the pump current is determined and the pump is activated based on this average value. a setting means for setting an offset value for reading the current by correlating it with the oxygen concentration in the exhaust gas, and (c) reading the pump current of the oxygen sensor offset by the offset value set by the setting means to detect the air-fuel ratio. An air-fuel ratio detecting device comprising: an air-fuel ratio detecting means for detecting an air-fuel ratio;