JPH036034U - - Google Patents
Info
- Publication number
- JPH036034U JPH036034U JP6490089U JP6490089U JPH036034U JP H036034 U JPH036034 U JP H036034U JP 6490089 U JP6490089 U JP 6490089U JP 6490089 U JP6490089 U JP 6490089U JP H036034 U JPH036034 U JP H036034U
- Authority
- JP
- Japan
- Prior art keywords
- fuel ratio
- air
- feedback correction
- correction amount
- engine
- 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 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000001301 oxygen Substances 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000003054 catalyst Substances 0.000 claims description 8
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims 3
- 238000002485 combustion reaction Methods 0.000 claims 3
- 239000007789 gas Substances 0.000 claims 2
- 238000013459 approach Methods 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
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図、第３図は
第２酸素センサのセンサ部の構造を示す断面図、
第４図〜第６図は同上実施例の空燃比制御のため
の各種ルーチンを示すフローチヤート、第７図は
正常時の第２酸素センサの出力波形図、第８図及
び第９図は異常時の第２酸素センサの出力波形図
である。
１……セラミツク管、２……内側電極、３……
外側電極、４……白金触媒層、５……還元触媒層
、１１……機関、１５……燃料噴射弁、１６……
コントロールユニツト、１９……第１酸素センサ
、２０……三元触媒、２２……第２酸素センサ。
Figure 1 is a block diagram showing the configuration of the present invention;
The figure shows the configuration of an embodiment of the present invention, and FIG. 3 is a sectional view showing the structure of the sensor section of the second oxygen sensor.
Figures 4 to 6 are flowcharts showing various routines for air-fuel ratio control in the same embodiment as above, Figure 7 is a diagram of the output waveform of the second oxygen sensor in normal conditions, and Figures 8 and 9 are abnormal. It is an output waveform diagram of the 2nd oxygen sensor at the time. 1... Ceramic tube, 2... Inner electrode, 3...
Outer electrode, 4... Platinum catalyst layer, 5... Reduction catalyst layer, 11... Engine, 15... Fuel injection valve, 16...
Control unit, 19...first oxygen sensor, 20...three-way catalyst, 22...second oxygen sensor.
Claims (1)
た酸素センサの検出する排気中の酸素濃度に基づ
く実際の空燃比を目標空燃比に近づけるように機
関への燃料供給量をフイードバツク制御して空燃
比を制御する内燃機関の空燃比制御装置において
、前記三元触媒の上流側の排気通路に装着され機
関排気の酸素濃度を検出する第１酸素センサと、
該第１酸素センサによつて検出された排気中酸素
濃度に基づく実際の空燃比と目標空燃比との偏差
に応じたフイードバツク補正量を比例積分制御に
より設定するフイードバツク補正量設定手段と、
該フイードバツク補正量設定手段で設定されたフ
イードバツク補正量を用いて空燃比を目標空燃比
に近づけるよう燃料供給手段による機関への燃料
供給量を補正する燃料供給量補正手段と、前記三
元触媒出口近傍の排気通路に装着され三元触媒通
過後の排気の酸素濃度を検出する窒素酸化物還元
触媒を含んだ第２酸素センサと、該第２酸素セン
サで検出された酸素濃度に基づく空燃比がリツチ
側又はリーン側に所定時間以上継続した時に前記
フイードバツク補正量設定手段で設定するフイー
ドバツク補正量の比例分を増大変更する比例分変
更手段とを備えたことを特徴とする内燃機関の空
燃比制御装置。 The amount of fuel supplied to the engine is feedback-controlled so that the actual air-fuel ratio approaches the target air-fuel ratio based on the oxygen concentration in the exhaust gas detected by an oxygen sensor installed in the exhaust passage of the engine equipped with a three-way catalyst. In an air-fuel ratio control device for an internal combustion engine that controls an air-fuel ratio, a first oxygen sensor is installed in an exhaust passage upstream of the three-way catalyst and detects the oxygen concentration of engine exhaust;
Feedback correction amount setting means for setting a feedback correction amount according to the deviation between the actual air-fuel ratio and the target air-fuel ratio based on the exhaust oxygen concentration detected by the first oxygen sensor, using proportional-integral control;
a fuel supply amount correction means for correcting the amount of fuel supplied to the engine by the fuel supply means so as to bring the air-fuel ratio closer to the target air-fuel ratio using the feedback correction amount set by the feedback correction amount setting means; and the three-way catalyst outlet. A second oxygen sensor that is installed in a nearby exhaust passage and includes a nitrogen oxide reduction catalyst that detects the oxygen concentration of the exhaust gas after passing through the three-way catalyst, and an air-fuel ratio that is based on the oxygen concentration detected by the second oxygen sensor. Air-fuel ratio control for an internal combustion engine, characterized in that the air-fuel ratio control for an internal combustion engine is provided with a proportional amount changing means for increasing or changing the proportional amount of the feedback correction amount set by the feedback correction amount setting means when the feedback correction amount continues to be on the rich side or the lean side for a predetermined time or more. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6490089U JPH036034U (en) | 1989-06-05 | 1989-06-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6490089U JPH036034U (en) | 1989-06-05 | 1989-06-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH036034U true JPH036034U (en) | 1991-01-22 |
Family
ID=31596245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6490089U Pending JPH036034U (en) | 1989-06-05 | 1989-06-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH036034U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147019A (en) * | 1974-05-17 | 1975-11-26 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61212643A (en) * | 1985-03-16 | 1986-09-20 | Toyota Motor Corp | Air-fuel ratio control device of internal-combustion engine |
| JPS63195350A (en) * | 1987-02-07 | 1988-08-12 | Toyota Motor Corp | Air-fuel ratio control device for internal combustion engine |
-
1989
- 1989-06-05 JP JP6490089U patent/JPH036034U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61212643A (en) * | 1985-03-16 | 1986-09-20 | Toyota Motor Corp | Air-fuel ratio control device of internal-combustion engine |
| JPS63195350A (en) * | 1987-02-07 | 1988-08-12 | Toyota Motor Corp | Air-fuel ratio control device for internal combustion engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147019A (en) * | 1974-05-17 | 1975-11-26 | ||
| JPS5621606B2 (en) * | 1974-05-17 | 1981-05-20 |
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