JPH031237U - - Google Patents
Info
- Publication number
- JPH031237U JPH031237U JP6182989U JP6182989U JPH031237U JP H031237 U JPH031237 U JP H031237U JP 6182989 U JP6182989 U JP 6182989U JP 6182989 U JP6182989 U JP 6182989U JP H031237 U JPH031237 U JP H031237U
- Authority
- JP
- Japan
- Prior art keywords
- correction coefficient
- heater
- feedback
- fuel ratio
- feedback correction
- 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
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断面図、
第３図は、同上実施例の空燃比制御ルーチンを示
すフローチヤート、第４図は、ヒータを内蔵した
酸素センサの構成を示す要部断面図である。
１１…機関、１２…排気マニホールド、１３…
酸素センサ、１３ａ…ヒータ、１４…コントロー
ルユニツト、１６…燃料噴射弁。
FIG. 1 is a block diagram showing the configuration of the present invention, and FIG. 2 is a sectional view showing the configuration of an embodiment of the present invention.
FIG. 3 is a flowchart showing the air-fuel ratio control routine of the same embodiment, and FIG. 4 is a sectional view of main parts showing the configuration of an oxygen sensor with a built-in heater. 11...engine, 12...exhaust manifold, 13...
Oxygen sensor, 13a... Heater, 14... Control unit, 16... Fuel injection valve.
Claims (1)
するヒータを内蔵した酸素センサを機関の排気通
路に設ける一方、所定の運転条件で前記酸素セン
サにより検出された排気中酸素濃度に基づいて制
御定数を増減してフイードバツク補正係数を設定
するフイードバツク補正係数設定手段と、設定さ
れたフイードバツク補正係数を用いて空燃比をフ
イードバツク制御するフイードバツク制御手段と
を備えた内燃機関の空燃比フイードバツク制御装
置において、前記ヒータへの通電電流を検出して
電流のリークの有無を判定するリーク判定手段と
、ヒータ電流がリークしていると判定されたとき
にヒータの通電を遮断する通電遮断手段と、同じ
くヒータ電流がリークしていると判定されたとき
にヒータを正常時に通電する排気温度条件で空燃
比フイードバツク制御時におけるフイードバツク
補正係数の制御定数を正常時より大きい値に補正
する制御定数補正手段と、を含んで構成したこと
を特徴とする空燃比フイードバツク制御装置のフ
エールセーフ装置。 (2) フイードバツク補正係数を平均化処理して
学習値として修正更新しつつ記憶するフイードバ
ツク補正係数学習手段と、ヒータ電流がリークし
ていると判定されたときにヒータを正常時に通電
する排気温度条件で、前記フイードバツク補正係
数学習手段による学習を停止し、前回の同一条件
における最終の学習値を使用する学習停止手段を
含んで構成されてなる請求項１に記載の空燃比フ
イードバツク制御装置のフエールセーフ装置。[Scope of Claim for Utility Model Registration] (1) An oxygen sensor with a built-in heater that is energized to heat the element when the exhaust gas temperature is low is provided in the exhaust passage of the engine; An internal combustion engine comprising: a feedback correction coefficient setting means for setting a feedback correction coefficient by increasing/decreasing a control constant based on the oxygen concentration in exhaust; and a feedback control means for feedback-controlling an air-fuel ratio using the set feedback correction coefficient. In the air-fuel ratio feedback control device, the leak determining means detects the current flowing to the heater and determines whether there is a current leak, and the heater current is cut off when it is determined that the heater current is leaking. In addition to the energization cutoff means, the control constant of the feedback correction coefficient during air-fuel ratio feedback control is corrected to a value larger than the normal value under the exhaust temperature condition in which the heater is energized under normal conditions when it is determined that the heater current is leaking. 1. A fail-safe device for an air-fuel ratio feedback control device, comprising: control constant correction means. (2) Feedback correction coefficient learning means that averages the feedback correction coefficient and stores it while correcting and updating it as a learned value, and exhaust temperature conditions for energizing the heater normally when it is determined that the heater current is leaking. 2. The fail-safe air-fuel ratio feedback control device according to claim 1, further comprising learning stopping means for stopping learning by said feedback correction coefficient learning means and using a final learned value under the same previous conditions. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989061829U JPH0810668Y2 (en) | 1989-05-30 | 1989-05-30 | Fail-safe device for air-fuel ratio feedback control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989061829U JPH0810668Y2 (en) | 1989-05-30 | 1989-05-30 | Fail-safe device for air-fuel ratio feedback control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH031237U true JPH031237U (en) | 1991-01-09 |
| JPH0810668Y2 JPH0810668Y2 (en) | 1996-03-29 |
Family
ID=31590425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989061829U Expired - Lifetime JPH0810668Y2 (en) | 1989-05-30 | 1989-05-30 | Fail-safe device for air-fuel ratio feedback control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0810668Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62225736A (en) * | 1986-03-27 | 1987-10-03 | Mitsubishi Motors Corp | Fuel feed controller for engine |
-
1989
- 1989-05-30 JP JP1989061829U patent/JPH0810668Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62225736A (en) * | 1986-03-27 | 1987-10-03 | Mitsubishi Motors Corp | Fuel feed controller for engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0810668Y2 (en) | 1996-03-29 |
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