JPS62171638U - - Google Patents
Info
- Publication number
- JPS62171638U JPS62171638U JP5958686U JP5958686U JPS62171638U JP S62171638 U JPS62171638 U JP S62171638U JP 5958686 U JP5958686 U JP 5958686U JP 5958686 U JP5958686 U JP 5958686U JP S62171638 U JPS62171638 U JP S62171638U
- Authority
- JP
- Japan
- Prior art keywords
- air
- sensor
- fuel ratio
- output
- feedback control
- 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
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims 7
- 238000002485 combustion reaction Methods 0.000 claims 3
- 238000001514 detection method Methods 0.000 claims 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 2
- 239000007789 gas Substances 0.000 claims 2
- 239000001301 oxygen Substances 0.000 claims 2
- 229910052760 oxygen Inorganic materials 0.000 claims 2
- 238000004092 self-diagnosis Methods 0.000 claims 2
- 230000005856 abnormality Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- 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ブロツク図、第２
図は本考案の一実施例の構成を示す構成図、第３
図は、同上実施例の制御動作を示すフローチヤー
ト、第４図は従来例の構成を示す構成図、第５図
はＯ２センサの正常時の出力状態を示す波形図、
第６図はＯ２センサの異常時の出力状態を示す波
形図である。
１……機関、４……排気通路、５……Ｏ２セン
サ、１１……コントロールユニツト、１２……Ｌ
ＥＤ。
Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a block diagram showing the configuration of the present invention.
The figure is a configuration diagram showing the configuration of an embodiment of the present invention.
FIG. 4 is a flowchart showing the control operation of the above embodiment, FIG. 4 is a configuration diagram showing the configuration of the conventional example, and FIG. 5 is a waveform diagram showing the output state of the O 2 sensor during normal operation.
FIG. 6 is a waveform diagram showing the output state of the O 2 sensor when it is abnormal. 1... Engine, 4... Exhaust passage, 5... O2 sensor, 11... Control unit, 12... L
ED.
Claims (1)
濃度の基準値に対する大小をオン・オフ的に検出
するＯ２センサからの信号に基づいて、機関の所
定運転条件で排気中酸素濃度を前記基準値近傍に
保つことにより、機関に供給される混合気の空燃
比を所定値に保つようにフイードバツク制御する
空燃比フイードバツク制御装置を備えた内燃機関
にあつて、Ｏ２センサの異常の有無を診断する自
己診断装置において、前記空燃比フイードバツク
制御装置による空燃比のフイードバツク制御時に
Ｏ２センサの出力のレベルを検出する出力レベル
検出手段と、同じくＯ２センサの出力が反転する
周期を検出する出力周期検出手段と、前記出力レ
ベル検出手段により検出される出力レベルが設定
値以下のときまたは前記出力周期検出手段により
検出される出力周期が設定値以上のときにＯ２セ
ンサが異常であると判定する判定手段と、該判定
手段による判定結果を報知する報知手段とを備え
て構成したことを特徴とする空燃比フイードバツ
ク制御装置付内燃機関におけるＯ２センサの自己
診断装置。 Based on the signal from the O2 sensor, which is installed in the exhaust passage of an internal combustion engine and detects whether the oxygen concentration in the exhaust gas is larger or smaller than the reference value on an on-off basis, the oxygen concentration in the exhaust gas is adjusted to the reference value under predetermined operating conditions of the engine. Diagnosing the presence or absence of an abnormality in the O2 sensor in internal combustion engines equipped with an air-fuel ratio feedback control device that performs feedback control to maintain the air-fuel ratio of the air-fuel mixture supplied to the engine at a predetermined value by keeping the air -fuel ratio close to the specified value. In the self-diagnosis device, the air-fuel ratio feedback control device includes an output level detection means for detecting the level of the output of the O 2 sensor during air-fuel ratio feedback control, and an output period for detecting the period at which the output of the O 2 sensor is reversed. and determining that the O 2 sensor is abnormal when the output level detected by the output level detection means is less than or equal to a set value or when the output cycle detected by the output cycle detection means is greater than or equal to the set value. 1. A self-diagnosis device for an O 2 sensor in an internal combustion engine equipped with an air-fuel ratio feedback control device, characterized in that it comprises a determining means and a notifying means for notifying the determination result by the determining means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5958686U JPS62171638U (en) | 1986-04-22 | 1986-04-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5958686U JPS62171638U (en) | 1986-04-22 | 1986-04-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62171638U true JPS62171638U (en) | 1987-10-30 |
Family
ID=30891213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5958686U Pending JPS62171638U (en) | 1986-04-22 | 1986-04-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62171638U (en) |
-
1986
- 1986-04-22 JP JP5958686U patent/JPS62171638U/ja active Pending
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