JPS61234243A - Control device for engine - Google Patents

Control device for engine

Info

Publication number
JPS61234243A
JPS61234243A JP7619785A JP7619785A JPS61234243A JP S61234243 A JPS61234243 A JP S61234243A JP 7619785 A JP7619785 A JP 7619785A JP 7619785 A JP7619785 A JP 7619785A JP S61234243 A JPS61234243 A JP S61234243A
Authority
JP
Japan
Prior art keywords
idle
engine
control constant
control
air
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
Application number
JP7619785A
Other languages
Japanese (ja)
Other versions
JPH0413537B2 (en
Inventor
Masaaki Yamauchi
山内 賢明
Koji Miyamoto
浩二 宮本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP7619785A priority Critical patent/JPS61234243A/en
Publication of JPS61234243A publication Critical patent/JPS61234243A/en
Publication of JPH0413537B2 publication Critical patent/JPH0413537B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE:To enable a response characteristic and idle stability to be obtained in an engine when its operation is transferred, by decreasing small a control constant after a number of inversion times of an air-fuel ratio decision means by an exhaust sensor reaches the predetermined number of times when it is decided that the engine is transferred to operation in an idle range. CONSTITUTION:An ECU 17, when an opening of a throttle valve 13 detected by a throttle sensor 18 is placed in a fully closed condition with an engine speed decreasing to a predetermined value or less, detects an engine that its operation is transferred from a non-idle condition to an idle condition. Here it is decided whether or not an output from an exhaust sensor 21 is inverted, and when the output is inverted, the ECU 17 performs counting. If this count reaches a predetermined value, the ECU 17 switches a control constant of air- fuel ratio feedback control from a large value for non-idle operation use to a small value for idle operation use. A degree of convergency is shown by a number of inversion times in the output of the exhaust sensor 21, and the ECU 17, changing small the control constant in the optimum timing corresponding to the convergency, correctly controls an idle condition thereafter to be stabilized.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、排気系に配設した排気センサの検出信号に応
じて吸気系に供給する空燃比を制御するようにしたエン
ジンの制御装置の改良に関するものである。
Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an engine control device that controls the air-fuel ratio supplied to an intake system in response to a detection signal from an exhaust sensor installed in the exhaust system. It is about improvement.

(従来技術) 従来より、エンジンの吸気系に供給する燃料量を制御す
る方法として、例えば、特開昭52−53141号に見
られるように、排気系に配設した排気センサ出力の反転
によって供給空燃比が目標空燃比(理論空燃比)よりリ
ッチ、あるいはり一ンかを検出し、この検出空燃比が所
定の値となるように燃料供給量を所定の制御定数(制御
利得)にてフィードバック制御する技術が公知である。
(Prior Art) Conventionally, as a method of controlling the amount of fuel supplied to the intake system of an engine, for example, as seen in Japanese Patent Laid-Open No. 52-53141, fuel is supplied by reversing the output of an exhaust sensor installed in the exhaust system. Detects whether the air-fuel ratio is richer or richer than the target air-fuel ratio (stoichiometric air-fuel ratio), and feeds back the fuel supply amount using a predetermined control constant (control gain) so that the detected air-fuel ratio becomes a predetermined value. Techniques for controlling this are known.

そして、通常の走行状態とアイドル時とでは、制御のベ
ースが異なるとともに、アイドル時は状態の変化が少な
いことから、制御定数を小さくして制御安定性を向上す
る一方、非アイドル域では運転状態の変化に対して応答
性を向上することから、制御定数を大きくするように切
換えることも知られている。
The base of control is different between normal driving conditions and idling, and since there are few changes in the state during idling, control constants are reduced to improve control stability, while in non-idling areas the driving conditions It is also known to increase the control constant in order to improve responsiveness to changes in .

上記のようにアイドル域と非アイドル域とで制御定数を
変える場合に、スロットルバルブの全閉およびエンジン
回転数の低下等の検出により、エンジンの運転状態が非
アイドル域からアイドル域に移行したことを判定した場
合に、すぐに制御定数を小さくするように切換えると、
それまでの制御ベースと異なることから、アイドル状態
の制御ベースに移行して安定するまでに時間を要し、所
定のアイドル時制御に収束するのが遅れるものである。
When changing the control constant between the idle range and the non-idle range as described above, the engine operating state has shifted from the non-idle range to the idle range due to detection of the throttle valve being fully closed, a decrease in engine speed, etc. If you immediately switch the control constant to a smaller value when
Since the control base is different from the previous control base, it takes time to shift to the idle state control base and stabilize, and convergence to the predetermined idle state control is delayed.

そこで、アイドル域に移行した場合には、所定時間の間
は制御定数を大きいままとし、この時間を経過した後に
遅れて制御定数を小さくするようにした制御システムが
ある。しかるに、アイドル時を判定して、所定時間後に
制御定数を切換えるものでは、実際の変動に対応せずに
正確さに欠けるものである。すなわち、制御定数の切換
時にまだアイドル状態に収束していない場合には、制御
定数が小さくなることによって収束に時間がかかるよう
になるか、もしくは、既にアイドル状態に収束している
場合には、制御定数が大きいままであることから、燃料
供給から検出までの遅れに対応するハンチング現象が大
きくなって、安定したアイドル状態が得られないもので
ある。
Therefore, there is a control system in which the control constant is kept large for a predetermined period of time when the vehicle shifts to the idle region, and the control constant is made small after this period has elapsed. However, a method that determines idle time and switches the control constant after a predetermined period of time does not respond to actual fluctuations and lacks accuracy. In other words, if the idle state has not yet been converged when the control constant is switched, the convergence will take longer as the control constant becomes smaller, or if the idle state has already been converged, Since the control constant remains large, the hunting phenomenon corresponding to the delay from fuel supply to detection increases, making it impossible to obtain a stable idling state.

(発明の目的) 本発明は上記事情に鑑み、非アイドル域からアイドル域
への移行時の応答性と、アイドル安定性とを共に得るよ
うにしたエンジンの制御装置を提供することを目的とす
るものである。
(Object of the Invention) In view of the above circumstances, an object of the present invention is to provide an engine control device that achieves both responsiveness and idle stability when transitioning from a non-idling range to an idling range. It is something.

(発明の構成) 本発明の制御装置は、非アイドル域からアイドル域への
移行判定時に、排気センサによる空燃比判定手段の反転
回数が所定回数に達した後に制御定数を小さくするよう
に変更するようにしたことを特徴とするものである。
(Structure of the Invention) The control device of the present invention changes the control constant to be small after the number of inversions of the air-fuel ratio determination means by the exhaust sensor reaches a predetermined number when determining a transition from a non-idling region to an idling region. It is characterized by the following.

(発明の効果) 本発明によれば、アイドル域となった時に制御定数を小
さくする際に、排気センサの反転回数を見て所定回数に
達した時に制御定数を変えるようにしたことにより、あ
る程度収束した状態に合せて変えることができ、収束す
るまでの応答性と収束した後の安定性とが良好に得られ
るものである。
(Effects of the Invention) According to the present invention, when reducing the control constant when the idle region is reached, the number of reversals of the exhaust sensor is checked and the control constant is changed when a predetermined number of times is reached. It can be changed according to the converged state, and good responsiveness until convergence and stability after convergence can be obtained.

すなわち、アイドル域に移行した場合のベースの変化に
対応する変動は、大きな制御定数によって速やかに行っ
て応答性を確保するとともに、排気センサの出力の反転
回数は収束の程度を示すものであって、これに対応して
最適な時期に制御定数を小さく変えて、その後のアイド
ル状態を正確に制御して安定させることができるもので
ある。
In other words, the fluctuations corresponding to the changes in the base when moving to the idle range are quickly performed using a large control constant to ensure responsiveness, and the number of reversals in the output of the exhaust sensor indicates the degree of convergence. In response to this, the control constant can be changed to a small value at an optimal time, and the subsequent idle state can be accurately controlled and stabilized.

(実施例) 以下、図面により本発明の詳細な説明する。(Example) Hereinafter, the present invention will be explained in detail with reference to the drawings.

第1図はエンジンの全体構成を示し、エンジン本体1の
ピストン2上部に形成される各気筒の燃焼室3には、吸
気弁4によって開閉される吸気ボート5および排気弁6
によって開閉される排気ボート7がそれぞれ開口され、
吸気ボート5に吸気通路8が、排気ボート7に排気通路
9がそれぞれ接続されている。
FIG. 1 shows the overall configuration of the engine. The combustion chamber 3 of each cylinder formed above the piston 2 of the engine body 1 includes an intake boat 5 and an exhaust valve 6, which are opened and closed by an intake valve 4.
The exhaust boats 7 which are opened and closed by are respectively opened,
An intake passage 8 is connected to the intake boat 5, and an exhaust passage 9 is connected to the exhaust boat 7.

吸気通路8は、上流端にエアクリーナ11を備え、その
下流に吸気量を検出するエア70−メータ12が介装さ
れ、スロットルバルブ13を介してサージタンク14に
接°続されている。このサージタンク14から各気筒に
対してそれぞれ独立して各気筒の吸気ボート5に接続さ
れ、吸気ボート5の近傍に燃料噴射弁15が配設されて
いる。
The intake passage 8 has an air cleaner 11 at its upstream end, an air meter 12 for detecting the amount of intake air installed downstream thereof, and is connected to a surge tank 14 via a throttle valve 13. This surge tank 14 is independently connected to each cylinder's intake boat 5, and a fuel injection valve 15 is disposed near the intake boat 5.

上記燃料噴射弁15には、エンジンコントロールユニッ
ト17 (ECU)からの噴射パルスが出力され、この
燃料噴射パルスのパルス幅に対応する時間だけ燃料を噴
射するものである。上記エンジンコントロールユニット
17には、エンジンの運転状態を検出するために、前記
エアフa−メータ12からの吸気山信号、スロットルバ
ルブ13に設けられたスロットルセンサ18からのスロ
ットル信号、エンジン本体1の冷却水通路19に設けら
れた水温センサ20からのエンジン温度信号、排気通路
9に設けられた排気センサ21(02センサ)からの排
気ガス成分濃度信号(空燃比信号)およびディストリビ
ュータ22からのイグニションパルス信号がそれぞれ入
力される。
An injection pulse from an engine control unit 17 (ECU) is output to the fuel injection valve 15, and fuel is injected for a time corresponding to the pulse width of this fuel injection pulse. The engine control unit 17 includes an intake peak signal from the air flow meter 12, a throttle signal from a throttle sensor 18 provided on the throttle valve 13, and a cooling signal for the engine body 1 to detect the operating state of the engine. An engine temperature signal from the water temperature sensor 20 provided in the water passage 19, an exhaust gas component concentration signal (air-fuel ratio signal) from the exhaust sensor 21 (02 sensor) provided in the exhaust passage 9, and an ignition pulse signal from the distributor 22. are input respectively.

このエンジンコントロールユニット17は、各信号に応
じて運転状態に対応する燃料噴射mを演算し、イグニシ
ョンパルスに応じた所定時期に燃料噴射パルスを、燃料
噴射弁15に対して出力するものである。また、排気セ
ンサ21による検出空燃比が所定の空燃比になるように
、燃料噴射パルスを補正するフィードバック制御を行う
ものである。そして、通常の走行状態のような非アイド
ル域においては、大きな制御定数で上記フィードバック
制御を行い、アイドル域では小さな制御定数でフィード
バック制御を行うものである。ざらに、非アイドル域か
らアイドル域へ移行した時に、排気センサ21が所定回
数(例えば3回)反転したことを検出してから、制御定
数をアイドル用に小さく変えるものである。
This engine control unit 17 calculates fuel injection m corresponding to the operating state according to each signal, and outputs a fuel injection pulse to the fuel injection valve 15 at a predetermined timing according to the ignition pulse. Further, feedback control is performed to correct the fuel injection pulse so that the air-fuel ratio detected by the exhaust sensor 21 becomes a predetermined air-fuel ratio. In a non-idling region such as a normal driving state, the feedback control is performed using a large control constant, and in an idling region, feedback control is performed using a small control constant. Roughly speaking, when transitioning from the non-idling range to the idling range, the control constant is changed to a small value for idling after detecting that the exhaust sensor 21 has reversed a predetermined number of times (for example, three times).

すなわち、非アイドル域からアイドル域への移行時の排
気センサ21出力と、フィードバック補正係数との関係
を第2図に示す。a点でアイドル状態に移行する前の非
アイドル状1it(定常運転時)においては、設定空燃
比に対して排気センサ21の検出出力がリッチ側からリ
ーン側にもしくはリーン側からリッチ側に反転するのに
応じて、フィードバック補正係数は、燃料供給mを増大
もしくは減少するべく大きな制御定数で変動するもので
ある。そして、a点でアイドル域に移行すると、それま
での補正係数の平均値から、制御ベースが変って補正係
数の平均値も変ることから、補正係数は燃料供給量を低
減する方向にそのままの大きな制御定数ですなわち大き
な傾きで変動し、排気センサ21出力の反転に対応して
その増減制御を行う。排気センサ21出力が3回反転し
、ある程 、度アイドル状態に収束したb点で、制御定
数を小さく変更し変動の傾きを小さくして少ない変動幅
で精度のよい制御を行うものである。なお、アイドル域
に移行したa点ですぐに制御定数を小さくすると、破線
で示すように変動の傾きが小さくなって、アイドル時の
補正係数の平均値に対して移行する時間が長くなって、
アイドル状態への収束が遅れるものである。
That is, FIG. 2 shows the relationship between the output of the exhaust sensor 21 and the feedback correction coefficient at the time of transition from the non-idling range to the idling range. In the non-idle state 1it (during steady operation) before shifting to the idle state at point a, the detection output of the exhaust sensor 21 is reversed from the rich side to the lean side or from the lean side to the rich side with respect to the set air-fuel ratio. In response to this, the feedback correction coefficient varies with a large control constant to increase or decrease the fuel supply m. Then, when the transition to the idle range occurs at point a, the control base changes and the average value of the correction coefficient changes from the average value of the correction coefficient up to that point, so the correction coefficient remains large in the direction of reducing the fuel supply amount. It varies with a control constant, that is, with a large slope, and its increase/decrease is controlled in response to the reversal of the output of the exhaust sensor 21. At point b, where the output of the exhaust sensor 21 is inverted three times and has converged to an idle state to a certain extent, the control constant is changed to a smaller value to reduce the slope of the fluctuation, thereby performing accurate control with a smaller fluctuation range. Note that if you immediately reduce the control constant at point a, which has entered the idle range, the slope of the fluctuation will become smaller, as shown by the broken line, and the time it will take to shift relative to the average value of the correction coefficient during idle will become longer.
This causes a delay in convergence to the idle state.

上記非アイドル域からアイドル域への移行時における、
エンジンコントロールユニット17の作動を、第3図の
フローチャートに沿って説明する。
When transitioning from the above non-idle area to the idle area,
The operation of the engine control unit 17 will be explained along the flowchart of FIG.

ステップS1はアイドル状態か否か判定するものであっ
て、例えば、スロットル開度が全開状態でエンジン回転
数が所定値以下に低下することによって検出し、非アイ
ドル時にはNoの判定によってステップS2でカウンタ
をOにリセットした後、ステップS3で制御定数を通常
運転用の大きな値にセットして、これに基づいてフィー
ドバック制御するものである。
Step S1 is to determine whether or not the engine is in an idling state. For example, it is detected when the throttle opening is fully open and the engine speed drops below a predetermined value, and when the engine is not idling, the counter is set in step S2 when the determination is No. After resetting to O, the control constant is set to a large value for normal operation in step S3, and feedback control is performed based on this.

一方、アイドル状態に移行すると、ステップS1の判定
がYESとなってステップS4に進み、このステップS
4でカウンタの計数が設定値N以上か否か判定する。N
未満のNoの時にはステップ$5で排気センサ出力が反
転したか否か判定し、反転していないNoの時には、前
記ステップS3に進んで大きい制御定数のまま制御を行
う。一方、反転したYESの時にはステップS6でカウ
ンタの計数を行ってから、ステップS3に進む。そして
、この排気センサ21出力の反転毎にステップS6のカ
ウントを繰返し、そのカウントが設定値Nに達すると、
ステップ$4の判定がYESとなってステップS7に進
み、制御定数をアイドル用の小さい値に設定するもので
ある。
On the other hand, when the state shifts to the idle state, the determination in step S1 becomes YES and the process proceeds to step S4.
In step 4, it is determined whether the count of the counter is greater than or equal to the set value N. N
If the result is No, it is determined in step $5 whether the exhaust sensor output has been reversed, and if the result is No, the process proceeds to step S3, where control is performed with the large control constant maintained. On the other hand, when the result is inverted YES, the counter is counted in step S6, and then the process proceeds to step S3. Then, the count in step S6 is repeated every time the output of the exhaust sensor 21 is reversed, and when the count reaches the set value N,
If the determination in step $4 is YES, the process proceeds to step S7, where the control constant is set to a small value for idling.

上記のような実施例により、通常の運転域ではエンジン
の運転状態の変動に対応して応答性よく燃料噴射制御が
行えるとともに、アイドル域へ移行した場合は速やかな
収束を得た後、安定した正確な制御を行うことができる
With the embodiment described above, fuel injection control can be performed with good responsiveness in response to fluctuations in the engine operating state in the normal operating range, and when it shifts to the idle range, it can quickly converge and then stabilize. Accurate control can be performed.

なお、排気センサ出力に基づくフィードバック制御方式
は上記実施例のほか、従来公知の制御方式が適宜採用可
能である。
In addition to the feedback control method based on the exhaust sensor output, in addition to the above-mentioned embodiments, conventionally known control methods can be adopted as appropriate.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例における制御装置を備えたエ
ンジンの概略構成図、 第2図A、Bはアイドル域に移行時の排気センサ出力と
フィードバック補正係数の変動関係を示す特性図、 第3図はエンジンコントロールユニットの作動を説明す
るためのフローチャートである。 1・・・・・・エンジン本体   5・・・・・・吸気
ボート8・・・・・・吸気通路     15・・・・
・・燃料噴射弁17・・・・・・エンジンコントロール
ユニット18・・・・・・スロットルセンサ 21・・・・・・排気センサ
FIG. 1 is a schematic configuration diagram of an engine equipped with a control device according to an embodiment of the present invention; FIGS. 2A and 2B are characteristic diagrams showing the fluctuation relationship between the exhaust sensor output and the feedback correction coefficient at the time of transition to the idle range; FIG. 3 is a flow chart for explaining the operation of the engine control unit. 1...Engine body 5...Intake boat 8...Intake passage 15...
... Fuel injection valve 17 ... Engine control unit 18 ... Throttle sensor 21 ... Exhaust sensor

Claims (1)

【特許請求の範囲】[Claims] (1)排気センサの検出信号に応じて目標空燃比に対し
リッチあるいはリーンを判定しエンジンに供給する空燃
比を所定の制御定数で制御し、アイドル時の制御定数を
非アイドル時の制御定数より小さくするエンジンの制御
装置において、非アイドル域からアイドル域への移行判
定時に、上記空燃比判定手段の反転回数が所定回数に達
した後に制御定数を小さくするように変更することを特
徴とするエンジンの制御装置。
(1) The target air-fuel ratio is determined to be rich or lean according to the detection signal of the exhaust sensor, and the air-fuel ratio supplied to the engine is controlled using a predetermined control constant, and the control constant during idling is set from the control constant during non-idling. A control device for an engine that is made smaller in size, wherein the control constant is changed to be smaller after the number of inversions of the air-fuel ratio determining means reaches a predetermined number of times when determining a transition from a non-idling region to an idling region. control device.
JP7619785A 1985-04-10 1985-04-10 Control device for engine Granted JPS61234243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7619785A JPS61234243A (en) 1985-04-10 1985-04-10 Control device for engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7619785A JPS61234243A (en) 1985-04-10 1985-04-10 Control device for engine

Publications (2)

Publication Number Publication Date
JPS61234243A true JPS61234243A (en) 1986-10-18
JPH0413537B2 JPH0413537B2 (en) 1992-03-10

Family

ID=13598422

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7619785A Granted JPS61234243A (en) 1985-04-10 1985-04-10 Control device for engine

Country Status (1)

Country Link
JP (1) JPS61234243A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01117959A (en) * 1987-10-30 1989-05-10 Honda Motor Co Ltd Air-fuel ratio feedback control for internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5297031A (en) * 1976-02-12 1977-08-15 Nissan Motor Co Ltd Air fuel ration controller
JPS60198348A (en) * 1984-03-23 1985-10-07 Mitsubishi Motors Corp Engine controller

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5297031A (en) * 1976-02-12 1977-08-15 Nissan Motor Co Ltd Air fuel ration controller
JPS60198348A (en) * 1984-03-23 1985-10-07 Mitsubishi Motors Corp Engine controller

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01117959A (en) * 1987-10-30 1989-05-10 Honda Motor Co Ltd Air-fuel ratio feedback control for internal combustion engine

Also Published As

Publication number Publication date
JPH0413537B2 (en) 1992-03-10

Similar Documents

Publication Publication Date Title
JPS5872646A (en) Air-fuel ratio control method for internal-combustion engine
US5168701A (en) Method of controlling the air-fuel ratio in an internal combustion engine
US5127225A (en) Air-fuel ratio feedback control system having a single air-fuel ratio sensor downstream of a three-way catalyst converter
US5697340A (en) Engine cold startup controller
US5099646A (en) Air-fuel ratio feedback control system having a single air-fuel ratio sensor downstream of a three-way catalyst converter
US5092123A (en) Air-fuel ratio feedback control system having air-fuel ratio sensors upstream and downstream of three-way catalyst converter
JPH0531649B2 (en)
JP3622273B2 (en) Control device for internal combustion engine
JPS61234243A (en) Control device for engine
US5671720A (en) Apparatus and method for controlling air-fuel ratio of an internal combustion engine
JP2515300B2 (en) Ignition timing control device for internal combustion engine
JP2521037B2 (en) Engine air-fuel ratio control device
JPH03488B2 (en)
JP3055378B2 (en) Control device for internal combustion engine
JPS63195349A (en) Air-fuel ratio control device for internal combustion engine
JPH09203337A (en) Air-fuel ratio controller for internal combustion engine
JPH0617692A (en) Failure judgment device for engine fuel system
JPH0746750Y2 (en) Air-fuel ratio controller for engine
JP2866468B2 (en) Air-fuel ratio control method for internal combustion engine
JP2609126B2 (en) Air-fuel ratio feedback control device for internal combustion engine
JPS61135950A (en) Air-fuel ratio feedback control method for electronically controlled engine
JPH0517398Y2 (en)
JPS62101857A (en) Electronically-controlled fuel injection device
JPS61108839A (en) Fuel injection control device of internal-combustion engine
JPH07158479A (en) Fuel injection control device for internal combustion engine

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees