JPH01124351U - - Google Patents
Info
- Publication number
- JPH01124351U JPH01124351U JP1978488U JP1978488U JPH01124351U JP H01124351 U JPH01124351 U JP H01124351U JP 1978488 U JP1978488 U JP 1978488U JP 1978488 U JP1978488 U JP 1978488U JP H01124351 U JPH01124351 U JP H01124351U
- Authority
- JP
- Japan
- Prior art keywords
- output
- oxygen sensor
- fuel ratio
- air
- ground potential
- 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 7
- 238000001514 detection method Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
第１図は本考案の基本概念図、第２〜４図は本
考案に係る空燃比検出装置を適用した空燃比制御
装置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図はその信号処理回路の回路図、
第４図はその信号処理回路の出力特性図を示す図
、第５〜７図は従来の空燃比検出装置を示す図で
あり、第５図はその酸素センサの断面図、第６図
はその酸素センサの起電力の特性を示す図、第７
図はその酸素センサの起電力の異常時の特性を示
す図である。
３１……エンジン、４２……酸素センサ、４３
……信号処理回路、４４……出力補正部（出力補
正手段）、４５……フイルタ部、４６……増幅部
、４７……運転状態検出手段、５０……コントロ
ールユニツト（判別手段）。
Fig. 1 is a basic conceptual diagram of the present invention, Figs. 2 to 4 are diagrams showing an embodiment of an air-fuel ratio control device to which the air-fuel ratio detection device according to the present invention is applied, and Fig. 2 is an overall configuration diagram thereof. , Figure 3 is a circuit diagram of the signal processing circuit,
Fig. 4 is a diagram showing the output characteristic diagram of the signal processing circuit, Figs. 5 to 7 are diagrams showing the conventional air-fuel ratio detection device, Fig. 5 is a cross-sectional view of the oxygen sensor, and Fig. 6 is the diagram. Diagram showing the characteristics of the electromotive force of the oxygen sensor, No. 7
The figure shows the characteristics of the electromotive force of the oxygen sensor when it is abnormal. 31...Engine, 42...Oxygen sensor, 43
... Signal processing circuit, 44 ... Output correction section (output correction means), 45 ... Filter section, 46 ... Amplification section, 47 ... Operating state detection means, 50 ... Control unit (discrimination means).
Claims (1)
境に出力が急変する酸素センサと、 (b) 酸素センサの出力に所定の正のバイアス電
圧をかけて、酸素センサの出力が接地電位以下の
場合であつても、少なくとも接地電位を超える電
圧を出力する出力補正手段と、 (c) 出力補正手段の出力を所定の基準電圧と比
較して空燃比のリツチ／リーンを判別する判別手
段と、 を備えたことを特徴とする空燃比検出装置。[Scope of Claim for Utility Model Registration] (a) An oxygen sensor that detects the oxygen concentration in exhaust gas and whose output changes suddenly at a predetermined air-fuel ratio; (b) A predetermined positive bias voltage is applied to the output of the oxygen sensor. (c) output correction means that outputs a voltage exceeding at least the ground potential even when the output of the oxygen sensor is below the ground potential; (c) the output of the output correction means is compared with a predetermined reference voltage to determine the air-fuel ratio; An air-fuel ratio detection device comprising: a determining means for determining whether the fuel is rich or lean;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978488U JPH01124351U (en) | 1988-02-17 | 1988-02-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978488U JPH01124351U (en) | 1988-02-17 | 1988-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01124351U true JPH01124351U (en) | 1989-08-24 |
Family
ID=31235597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1978488U Pending JPH01124351U (en) | 1988-02-17 | 1988-02-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01124351U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006300625A (en) * | 2005-04-19 | 2006-11-02 | Toyota Motor Corp | Abnormality detection device of oxygen sensor |
-
1988
- 1988-02-17 JP JP1978488U patent/JPH01124351U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006300625A (en) * | 2005-04-19 | 2006-11-02 | Toyota Motor Corp | Abnormality detection device of oxygen sensor |
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