JPH0387949U - - Google Patents
Info
- Publication number
- JPH0387949U JPH0387949U JP14987789U JP14987789U JPH0387949U JP H0387949 U JPH0387949 U JP H0387949U JP 14987789 U JP14987789 U JP 14987789U JP 14987789 U JP14987789 U JP 14987789U JP H0387949 U JPH0387949 U JP H0387949U
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel ratio
- ratio sensor
- catalyst
- catalytic converter
- 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
- 239000000446 fuel Substances 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 claims description 4
- 230000003197 catalytic effect Effects 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims 2
- 230000002159 abnormal effect Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
第１図はこの考案のクレーム対応図、第２図は
この考案の一実施例の構成を示す説明図、第３図
はＯ２センサの出力を説明するための特性図、第
４図は実施例の動作を説明するためのフローチヤ
ート、第５図は触媒が劣化したときの下流側のＯ
２センサの出力変化を説明するための特性図であ
る。
１……触媒コンバータ、２……第１の空燃比セ
ンサ、３……第２の空燃比センサ、４……混合気
供給手段、５……空燃比制御手段、６……触媒活
性化判定手段、７……異常判定手段。
Fig. 1 is a diagram corresponding to claims of this invention, Fig. 2 is an explanatory diagram showing the configuration of an embodiment of this invention, Fig. 3 is a characteristic diagram for explaining the output of the O 2 sensor, and Fig. 4 is an implementation diagram. A flowchart for explaining the operation of the example, Figure 5 shows the downstream O when the catalyst deteriorates.
It is a characteristic diagram for explaining the output change of two sensors. DESCRIPTION OF SYMBOLS 1... Catalytic converter, 2... First air-fuel ratio sensor, 3... Second air-fuel ratio sensor, 4... Air-fuel mixture supply means, 5... Air-fuel ratio control means, 6... Catalyst activation determination means , 7... Abnormality determination means.
Claims (1)
１の空燃比センサを配設し、前記触媒コンバータ
の下流に第２の空燃比センサを配設して、所定の
運転条件下でそれら２つの空燃比センサの出力に
基づき内燃機関の空燃比をフイードバツク制御す
るシステムにおける空燃比センサの異常検出装置
であつて、 前記触媒コンバータの触媒が活性化しているか
否かを触媒の温度に関連する情報に基づいて判定
する触媒活性化判定手段と、 前記触媒が活性化していないときに前記第２の
空燃比センサの出力が異常であるか否かを判定す
る異常判定手段と を備えたことを特徴とする空燃比センサの異常検
出装置。[Claims for Utility Model Registration] A first air-fuel ratio sensor is disposed upstream of a catalytic converter installed in the exhaust system, a second air-fuel ratio sensor is disposed downstream of the catalytic converter, An abnormality detection device for an air-fuel ratio sensor in a system that feedback-controls the air-fuel ratio of an internal combustion engine based on the outputs of the two air-fuel ratio sensors under operating conditions, the device detecting whether or not the catalyst of the catalytic converter is activated. catalyst activation determining means for determining based on information related to catalyst temperature; and abnormality determining means for determining whether the output of the second air-fuel ratio sensor is abnormal when the catalyst is not activated. An abnormality detection device for an air-fuel ratio sensor, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14987789U JPH0387949U (en) | 1989-12-26 | 1989-12-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14987789U JPH0387949U (en) | 1989-12-26 | 1989-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0387949U true JPH0387949U (en) | 1991-09-09 |
Family
ID=31696250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14987789U Pending JPH0387949U (en) | 1989-12-26 | 1989-12-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0387949U (en) |
-
1989
- 1989-12-26 JP JP14987789U patent/JPH0387949U/ja active Pending
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