JPS6336420B2 - - Google Patents
Info
- Publication number
- JPS6336420B2 JPS6336420B2 JP58060054A JP6005483A JPS6336420B2 JP S6336420 B2 JPS6336420 B2 JP S6336420B2 JP 58060054 A JP58060054 A JP 58060054A JP 6005483 A JP6005483 A JP 6005483A JP S6336420 B2 JPS6336420 B2 JP S6336420B2
- Authority
- JP
- Japan
- Prior art keywords
- duty ratio
- loop control
- air
- closed
- control circuit
- 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.)
- Expired
Links
- 239000000446 fuel Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 241000234435 Lilium Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/0015—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for using exhaust gas sensors
- F02D35/0046—Controlling fuel supply
- F02D35/0053—Controlling fuel supply by means of a carburettor
- F02D35/0061—Controlling the emulsifying air only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Control Of The Air-Fuel Ratio Of Carburetors (AREA)
Description
【発明の詳細な説明】
＜技術分野＞
本発明は内燃機関の混合気供給装置における空
燃比制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to an air-fuel ratio control device in an air-fuel mixture supply device for an internal combustion engine.
＜従来技術＞
従来、電子制御式気化器（ECC）では補正用
エアブリードにパルス電磁弁を装着し、排気系に
設けた酸素（O2）センサからの信号に基づいて
パルス電磁弁へのパルス信号のデユーテイ比を制
御することにより空燃比をほぼ理論空燃比にフイ
ードバツク制御（閉ループ制御）しているが、高
負荷時（急加速時）および低温時には閉ループ制
御を中止し、リツチ側に開ループ制御している。
すなわち、リツチ側に相当するよう予め定めたデ
ユーテイ比（例えば40％）でパルス電磁弁を駆動
するのである（第１図Ａ参照）。<Prior art> Conventionally, in electronically controlled carburetors (ECCs), a pulse solenoid valve is attached to the correction air bleed, and a pulse is sent to the pulse solenoid valve based on a signal from an oxygen (O 2 ) sensor installed in the exhaust system. By controlling the duty ratio of the signal, the air-fuel ratio is feedback-controlled (closed-loop control) to approximately the stoichiometric air-fuel ratio, but at times of high load (sudden acceleration) and low temperatures, closed-loop control is stopped and an open-loop control is applied to the rich side. It's in control.
That is, the pulse solenoid valve is driven at a predetermined duty ratio (for example, 40%) corresponding to the rich side (see FIG. 1A).
しかしながら、気化器自体の特性が経年変化等
によつてリーン側に変化した場合（第１図Ｂ参
照）、閉ループ制御時はデユーテイ比を減少側
（リツチ側）にして理論空燃比に保つから、閉ル
ープ制御時のデユーテイ比の方が予め定められた
固定デユーテイ比よりリツチ側に相当するように
なることがあり、このような状態で固定デユーテ
イ比の開ループ制御に移ると、これによりかえつ
てリーン側に制御されてしまい、運転性を悪化さ
せてしまうという問題点があつた。 However, if the characteristics of the carburetor itself change to the lean side due to aging etc. (see Figure 1B), the duty ratio is reduced (rich) during closed loop control to maintain the stoichiometric air-fuel ratio. The duty ratio during closed-loop control may become richer than the predetermined fixed duty ratio, and if you shift to open-loop control with a fixed duty ratio in such a situation, this will instead result in a leaner ratio. There was a problem in that the vehicle was controlled by the side, which worsened drivability.
＜発明の目的＞
本発明はこのような従来の問題点に鑑み、空燃
比をリツチ側にすべく開ループ制御に移行しよう
とする際、閉ループ制御時のデユーテイ比と固定
デユーテイ比を比較し、閉ループ制御時のデユー
テイ比の方がリツチ側のときは、開ループ制御を
行わないようにして運転性の悪化を防止すること
を目的とする。<Object of the Invention> In view of these conventional problems, the present invention compares the duty ratio during closed loop control and a fixed duty ratio when attempting to shift to open loop control to make the air-fuel ratio richer. When the duty ratio during closed-loop control is on the rich side, the purpose is to prevent deterioration of drivability by not performing open-loop control.
＜発明の構成＞
このため、本発明は、閉ループ制御回路による
デユーテイ比と固定デユーテイ比とを比較する回
路と、所定の運転条件でかつ閉ループ制御回路に
よるデユーテイ比が固定デユーテイ比よりリーン
側に相当する時にパルス電磁弁に対し閉ループ制
御回路によるデユーテイ比に代えて固定デユーテ
イ比のパルス信号を与える切換回路とを設け、閉
ループ制御回路によるデユーテイ比が固定デユー
テイ比よりリツチ側に相当する時には所定の運転
条件となつても開ループ制御に移行しないように
したものである。<Configuration of the Invention> For this reason, the present invention provides a circuit that compares a duty ratio by a closed-loop control circuit with a fixed duty ratio, and a circuit that compares a duty ratio by a closed-loop control circuit with a fixed duty ratio, and a circuit in which the duty ratio by the closed-loop control circuit is on the lean side than the fixed duty ratio under predetermined operating conditions. A switching circuit is provided to give a pulse signal with a fixed duty ratio to the pulse solenoid valve in place of the duty ratio provided by the closed loop control circuit, and when the duty ratio provided by the closed loop control circuit is richer than the fixed duty ratio, the specified operation This is to prevent transition to open-loop control even if the condition is met.
＜実施例＞ 以下に実施例を説明する。<Example> Examples will be described below.
第２図において、１は気化器のベンチユリ、２
はフロート室、３はエアブリード、４は補正用エ
アブリード、５は補正用エアブリード４に設けら
れたパルス電磁弁である。 In Figure 2, 1 is the bench lily of the carburetor, 2
3 is a float chamber, 3 is an air bleed, 4 is a correction air bleed, and 5 is a pulse solenoid valve provided in the correction air bleed 4.
パルス電磁弁５はコントロールユニツト６から
のパルス信号によつて駆動され、パルス信号のデ
ユーテイ比が大きくなるほど開弁時間割合が増大
し、このとき空燃比はリーン側に制御される。 The pulse electromagnetic valve 5 is driven by a pulse signal from the control unit 6, and as the duty ratio of the pulse signal increases, the valve opening time ratio increases, and at this time, the air-fuel ratio is controlled to the lean side.
コントロールユニツト６には、排気系に設けた
O2センサ７からの信号（実際の空燃比）が入力
されこれに基づいて空燃比をほぼ理論空燃比にフ
イードバツク制御すべくパルス信号のデユーテイ
比を設定する閉ループ制御回路８が設けられてい
る。そして、閉ループ制御回路８によるデユーテ
イ比は切換回路９を介して出力回路１０に送ら
れ、この出力回路１０からパルス電磁弁５にパル
ス信号が与えられるようになつている。 The control unit 6 has a
A closed loop control circuit 8 is provided which receives the signal (actual air-fuel ratio) from the O 2 sensor 7 and sets the duty ratio of the pulse signal based on the signal to feedback-control the air-fuel ratio to approximately the stoichiometric air-fuel ratio. The duty ratio generated by the closed loop control circuit 8 is sent to an output circuit 10 via a switching circuit 9, and a pulse signal is applied from the output circuit 10 to the pulse solenoid valve 5.
切換回路９は、スロツトル弁の全開位置から高
負荷を検出する高負荷検出スイツチ１１および冷
却水温度が所定値以下の状態を検出する低温検出
スイツチ１２の各出力端がつながれているオア回
路１３から高負荷時および低温時に発せられる信
号がゲート回路１４を介して入力されたときに作
動し、このとき閉ループ制御回路８によるデユー
テイ比に代えて固定デユーテイ比を選択し、出力
回路１０を介して固定デユーテイ比のパルス信号
をパルス電磁弁５に与えるようになつている。 The switching circuit 9 is connected to an OR circuit 13 to which the output terminals of a high load detection switch 11 that detects a high load from the fully open position of the throttle valve and a low temperature detection switch 12 that detects a state where the cooling water temperature is below a predetermined value are connected. It is activated when a signal generated at high load or low temperature is input through the gate circuit 14, and at this time, a fixed duty ratio is selected instead of the duty ratio by the closed loop control circuit 8, and the fixed duty ratio is fixed through the output circuit 10. A pulse signal with a duty ratio is applied to the pulse solenoid valve 5.
ゲート回路１４は、閉ループ制御回路８による
デユーテイ比（Dv）と固定デユーテイ比（Df）
とを比較する比較回路１５により、Dv＞Dfの時
（Dvの方がリーン側に相当する時）に導電状態と
なり、Dv≦Dfの時に遮断状態となるようになつ
ている。 The gate circuit 14 has a duty ratio (Dv) and a fixed duty ratio (Df) determined by the closed loop control circuit 8.
The comparator circuit 15 which compares Dv to Df makes it conductive when Dv>Df (when Dv corresponds to the lean side), and turns off when Dv≦Df.
従つて、気化器の特性が正常の場合は、Dv＞
Dfであるから、高負荷時および低温時には第３
図Ａに示すように固定デユーテイ比による開ルー
プ制御が行われ、空燃比をリツチ側に制御する。 Therefore, if the characteristics of the vaporizer are normal, Dv＞
Since it is Df, the third
As shown in Figure A, open-loop control with a fixed duty ratio is performed to control the air-fuel ratio to the rich side.
また、気化器の特性がリーン側に変化すること
より、Dv≦Dfとなつた場合は、高負荷時又は低
温時であつてオア回路１３から信号が発せられて
も、比較回路１５によりゲート回路１４が遮断さ
れているため、切換回路９による切換が行われ
ず、第３図Ｂに示すように閉ループ制御が続行さ
れる。 Furthermore, since the characteristics of the carburetor change to the lean side, if Dv≦Df, even if a signal is emitted from the OR circuit 13 at high load or low temperature, the comparison circuit 15 will cause the gate circuit to 14 is cut off, no switching is performed by the switching circuit 9, and closed loop control continues as shown in FIG. 3B.
尚、フローチヤートは第４図の如くとなる。 The flowchart is as shown in FIG.
＜発明の効果＞
以上説明したように本発明によれば、気化器の
特性がリーン側に変化した場合に運転性が大きく
変化することがなくなるという効果が得られる。<Effects of the Invention> As explained above, according to the present invention, it is possible to obtain the effect that the drivability does not change significantly even when the characteristics of the carburetor change to the lean side.
第１図Ａ，Ｂは従来の特性図、第２図は本発明
の一実施例を示す概略構成図、第３図Ａ，Ｂは本
発明の特性図、第４図は同上実施例のフローチヤ
ートである。
４……補正用エアブリード、５……パルス電磁
弁、６……コントロールユニツト、７……O2セ
ンサ、８……閉ループ制御回路、９……切換回
路、１１……高負荷検出スイツチ、１２……低温
検出スイツチ、１３……オア回路、１４……ゲー
ト回路、１５……比較回路。
Figures 1A and B are conventional characteristic diagrams, Figure 2 is a schematic configuration diagram showing an embodiment of the present invention, Figures 3A and B are characteristic diagrams of the present invention, and Figure 4 is a flowchart of the same embodiment. It's a chat. 4...Air bleed for correction, 5...Pulse solenoid valve, 6...Control unit, 7... O2 sensor, 8...Closed loop control circuit, 9...Switching circuit, 11...High load detection switch, 12 ... Low temperature detection switch, 13 ... OR circuit, 14 ... Gate circuit, 15 ... Comparison circuit.
Claims (1)
比をパルス信号のデユーテイ比に応じて制御する
パルス電磁弁と、排気系に設けた酸素センサから
の信号に基づいてパルス信号のデユーテイ比を制
御することにより空燃比をフイードバツク制御す
る閉ループ制御回路と、閉ループ制御回路による
デユーテイ比と空燃比をリツチ側にすべく予め設
定した固定デユーテイ比とを比較する比較回路
と、所定の運転条件でかつ閉ループ制御回路によ
るデユーテイ比が固定デユーテイ比よりリーン側
に相当する時にパルス電磁弁に対し閉ループ制御
回路によるデユーテイ比に代えて固定デユーテイ
比のパルス信号を与え、所定の運転条件以外の時
あるいは閉ループ制御回路によるデユーテイ比が
固定デユーテイ比よりリーン側に相当しない時に
パルス電磁弁に対し閉ループ制御回路によるデユ
ーテイ比のパルス信号を与える切換回路とを備え
てなる内燃機関の混合気供給装置における空燃比
制御装置。1. A pulse solenoid valve that controls the air-fuel ratio of the mixture supplied by the mixture supply device according to the duty ratio of the pulse signal, and the duty ratio of the pulse signal is controlled based on the signal from the oxygen sensor installed in the exhaust system. A closed-loop control circuit performs feedback control of the air-fuel ratio by controlling the air-fuel ratio, a comparison circuit compares the duty ratio of the closed-loop control circuit with a fixed duty ratio preset to make the air-fuel ratio rich, and the closed-loop control circuit performs closed-loop control under predetermined operating conditions. When the duty ratio by the circuit corresponds to the lean side than the fixed duty ratio, a pulse signal with a fixed duty ratio is given to the pulse solenoid valve instead of the duty ratio by the closed loop control circuit, and when the operating conditions are other than the predetermined operating conditions or by the closed loop control circuit. An air-fuel ratio control device in an internal combustion engine air-fuel mixture supply device, comprising a switching circuit that provides a pulse signal of a duty ratio by a closed loop control circuit to a pulse solenoid valve when the duty ratio does not correspond to a leaner side than a fixed duty ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6005483A JPS59185855A (en) | 1983-04-07 | 1983-04-07 | Air-fuel ratio control device for mixture gas supply device of internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6005483A JPS59185855A (en) | 1983-04-07 | 1983-04-07 | Air-fuel ratio control device for mixture gas supply device of internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59185855A JPS59185855A (en) | 1984-10-22 |
| JPS6336420B2 true JPS6336420B2 (en) | 1988-07-20 |
Family
ID=13130983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6005483A Granted JPS59185855A (en) | 1983-04-07 | 1983-04-07 | Air-fuel ratio control device for mixture gas supply device of internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59185855A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8702460D0 (en) * | 1987-02-04 | 1987-03-11 | Lucas Elect Electron Syst | Electronic control system for i c engine |
| JPH0437244Y2 (en) * | 1987-02-06 | 1992-09-02 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724439A (en) * | 1980-07-16 | 1982-02-09 | Fuji Heavy Ind Ltd | Air fuel ratio controller |
-
1983
- 1983-04-07 JP JP6005483A patent/JPS59185855A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5724439A (en) * | 1980-07-16 | 1982-02-09 | Fuji Heavy Ind Ltd | Air fuel ratio controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59185855A (en) | 1984-10-22 |
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