JPH0445963U - - Google Patents
Info
- Publication number
- JPH0445963U JPH0445963U JP8784590U JP8784590U JPH0445963U JP H0445963 U JPH0445963 U JP H0445963U JP 8784590 U JP8784590 U JP 8784590U JP 8784590 U JP8784590 U JP 8784590U JP H0445963 U JPH0445963 U JP H0445963U
- Authority
- JP
- Japan
- Prior art keywords
- oxygen sensor
- output
- determining
- engine
- determining means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 claims 2
- 230000005856 abnormality Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 claims 1
- 230000006866 deterioration Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 230000002779 inactivation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
第１図は本考案の構成を示す機能ブロツク図、
第２図は一実施例のシステム図、第３図は燃料噴
射量演算ルーチンのフローチヤート、第４図はク
ランク角フイードバツク補正係数設定ルーチンの
フローチヤート、第５図は学習ルーチンのフロー
チヤート、第６図は酸素センサ出力のタイムチヤ
ート、第７図は診断ルーチンのフローチヤート、
第８図は空燃比フイードバツク制御を示すタイム
チヤート、第９図は運転状態の領域を示す線図、
第１０図は従来の問題点を示す線図である。
１……機関、７……燃料噴射弁、８……コント
ロールユニツト、１０……エアフローメータ、１
１……クランク角センサ、１３……酸素センサ。
Figure 1 is a functional block diagram showing the configuration of the present invention.
Figure 2 is a system diagram of one embodiment, Figure 3 is a flowchart of a fuel injection amount calculation routine, Figure 4 is a flowchart of a crank angle feedback correction coefficient setting routine, Figure 5 is a flowchart of a learning routine, and Figure 5 is a flowchart of a learning routine. Figure 6 is a time chart of the oxygen sensor output, Figure 7 is a flow chart of the diagnostic routine,
Fig. 8 is a time chart showing air-fuel ratio feedback control, Fig. 9 is a diagram showing operating state regions,
FIG. 10 is a diagram showing conventional problems. 1... Engine, 7... Fuel injection valve, 8... Control unit, 10... Air flow meter, 1
1...Crank angle sensor, 13...Oxygen sensor.
Claims (1)
スライスレベルを境として、空燃比のリツチ側で
大、リーン側で小の電圧を出力する酸素センサの
診断装置であつて、 前記酸素センサの出力電圧がリツチ側にある時
間ＴＲ及びリーン側にある時間ＴＬをそれぞれ検
出する時間検出手段と、 前記両時間の比（ＴＲ／ＴＬ）が所定値以上の
とき酸素センサの出力異常と判定する出力異常判
定手段と、 機関の運転状態を検出する運転状態検出手段と
、 機関の運転状態が高回転又は高負荷で、酸素セ
ンサが出力異常のときに劣化と判定する劣化判定
手段と、 機関の運転状態が低回転且つ低負荷で、酸素セ
ンサが出力異常のときに非活性と判定する非活性
判定手段と、 を設けたことを特徴とする内燃機関の酸素センサ
の診断装置。[Claim for Utility Model Registration] Diagnostic device for an oxygen sensor that responds to the oxygen concentration in the exhaust gas of an internal combustion engine and outputs a voltage that is high on the rich side of the air-fuel ratio and low on the lean side, with a predetermined slice level as the boundary. time detection means for respectively detecting a time TR when the output voltage of the oxygen sensor is on the rich side and a time TL when the output voltage is on the lean side; An output abnormality determining means for determining that the output of the sensor is abnormal; an operating state detecting means for detecting the operating state of the engine; An oxygen sensor for an internal combustion engine, comprising: a deterioration determining means; and an inactivation determining means for determining that the oxygen sensor is inactive when the engine is operating at low rotation and low load and the oxygen sensor has an abnormal output. Diagnostic equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8784590U JPH0445963U (en) | 1990-08-24 | 1990-08-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8784590U JPH0445963U (en) | 1990-08-24 | 1990-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0445963U true JPH0445963U (en) | 1992-04-20 |
Family
ID=31820557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8784590U Pending JPH0445963U (en) | 1990-08-24 | 1990-08-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0445963U (en) |
-
1990
- 1990-08-24 JP JP8784590U patent/JPH0445963U/ja active Pending