JPH0254347U - - Google Patents
Info
- Publication number
- JPH0254347U JPH0254347U JP13424788U JP13424788U JPH0254347U JP H0254347 U JPH0254347 U JP H0254347U JP 13424788 U JP13424788 U JP 13424788U JP 13424788 U JP13424788 U JP 13424788U JP H0254347 U JPH0254347 U JP H0254347U
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel ratio
- sensor
- calculating
- cylinder
- 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.)
- Granted
Links
- 239000000446 fuel Substances 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000006866 deterioration Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
第１図はこの考案のクレーム対応図、第２図は
この考案を４気筒エンジンに適用した場合の一実
施例の制御系のシステム図、第３図は三元触媒シ
ステムにおける空燃比補正係数の変化特性を示す
波形図、第４図は前記実施例における空燃比補正
係数の変化特性を示す波形図、第５図はこの実施
例のコントロールユニツトの制御動作を説明する
ための流れ図、第６図はこの実施例の基準時間Ｔ
Ｒの特性図、第７図はこの考案の他の実施例の制
御動作を説明するための流れ図である。
１……空燃比センサ、２……横切り判定手段、
３……比例分算出手段、４……空燃比フイードバ
ツク補正量算出手段、５……燃料噴射量決定手段
、７……比例分増大手段、８……測定手段、９…
…応答劣化判定手段、２１……排気ポート、２２
……排気通路、２４……触媒コンバータ、２５…
…酸素センサ（空燃比センサ）、２６……吸気ポ
ート、２７……スロツトルバルブ、２９……エア
フローメータ、３１……クランク角センサ、３５
……コントロールユニツト、３６……燃料噴射弁
。
Fig. 1 is a complaint correspondence diagram of this invention, Fig. 2 is a system diagram of a control system of one embodiment when this invention is applied to a four-cylinder engine, and Fig. 3 is a diagram of the air-fuel ratio correction coefficient in a three-way catalyst system. FIG. 4 is a waveform diagram showing the change characteristics of the air-fuel ratio correction coefficient in the embodiment described above, FIG. 5 is a flow chart for explaining the control operation of the control unit of this embodiment, and FIG. is the reference time T in this example
The characteristic diagram of R, FIG. 7, is a flowchart for explaining the control operation of another embodiment of this invention. 1...Air-fuel ratio sensor, 2...Cross crossing determination means,
3... Proportional component calculating means, 4... Air-fuel ratio feedback correction amount calculating means, 5... Fuel injection amount determining means, 7... Proportional component increasing means, 8... Measuring means, 9...
...Response deterioration determination means, 21...Exhaust port, 22
...Exhaust passage, 24...Catalytic converter, 25...
... Oxygen sensor (air-fuel ratio sensor), 26 ... Intake port, 27 ... Throttle valve, 29 ... Air flow meter, 31 ... Crank angle sensor, 35
...Control unit, 36...Fuel injection valve.
Claims (1)
このセンサ出力が理論空燃比相当のスライスレベ
ルを横切つたかどうかを判定する手段と、これが
判定されたときに空燃比をステツプ的に変化させ
る比例分を算出する手段と、この比例分を含んで
空燃比のフイードバツク補正量を算出する手段と
、この補正量にて運転条件に応じた基本噴射量を
補正してシリンダに供給すべき燃料噴射量を決定
する手段とを備えるエンジンの空燃比制御装置に
おいて、前記比例分を特別に大きくする手段と、
この大きな比例分による燃料補正にて燃焼したガ
スがシリンダから排気されてより前記センサ出力
がスライスレベルを横切るまでの経過時間または
経過クランク角を測定する手段と、この測定値と
予め定めた基準値との比較により前記センサに応
答劣化が生じているかどうかを判定する手段とを
備えることを特徴とするエンジンの空燃比制御装
置。 A sensor that outputs an output according to the air-fuel ratio in the exhaust,
A means for determining whether the sensor output crosses a slice level corresponding to the stoichiometric air-fuel ratio, a means for calculating a proportional amount for changing the air-fuel ratio in steps when this is determined, and a means for calculating the proportional amount for changing the air-fuel ratio in steps. An air-fuel ratio control system for an engine, comprising: means for calculating a feedback correction amount of an air-fuel ratio; and means for correcting a basic injection amount according to operating conditions using this correction amount to determine a fuel injection amount to be supplied to a cylinder. In the apparatus, means for specially increasing the proportion;
Means for measuring the elapsed time or elapsed crank angle from when the burned gas is exhausted from the cylinder to when the sensor output crosses the slice level by the fuel correction based on the large proportion, and a means for measuring the elapsed time or elapsed crank angle from when the burned gas is exhausted from the cylinder to the time when the sensor output crosses the slice level, and the measured value and the predetermined reference value. an air-fuel ratio control device for an engine, comprising means for determining whether response deterioration has occurred in the sensor by comparison with the sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13424788U JPH0543253Y2 (en) | 1988-10-14 | 1988-10-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13424788U JPH0543253Y2 (en) | 1988-10-14 | 1988-10-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0254347U true JPH0254347U (en) | 1990-04-19 |
| JPH0543253Y2 JPH0543253Y2 (en) | 1993-10-29 |
Family
ID=31392832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13424788U Expired - Lifetime JPH0543253Y2 (en) | 1988-10-14 | 1988-10-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0543253Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328975A (en) * | 2005-05-23 | 2006-12-07 | Fuji Heavy Ind Ltd | Abnormality diagnostic system of air-fuel ratio sensor |
-
1988
- 1988-10-14 JP JP13424788U patent/JPH0543253Y2/ja not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006328975A (en) * | 2005-05-23 | 2006-12-07 | Fuji Heavy Ind Ltd | Abnormality diagnostic system of air-fuel ratio sensor |
| JP4647393B2 (en) * | 2005-05-23 | 2011-03-09 | 富士重工業株式会社 | Air-fuel ratio sensor abnormality diagnosis device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0543253Y2 (en) | 1993-10-29 |
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