JPS6143229A - Air-fuel ratio control method of engine - Google Patents
Air-fuel ratio control method of engineInfo
- Publication number
- JPS6143229A JPS6143229A JP16319484A JP16319484A JPS6143229A JP S6143229 A JPS6143229 A JP S6143229A JP 16319484 A JP16319484 A JP 16319484A JP 16319484 A JP16319484 A JP 16319484A JP S6143229 A JPS6143229 A JP S6143229A
- Authority
- JP
- Japan
- Prior art keywords
- engine
- air
- fuel ratio
- pipe pressure
- signal
- 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
Classifications
-
- 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
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
Abstract
Description
【発明の詳細な説明】
本発明はエンジンのいくつかの状態を検出して電子式の
制御ユニットにおいてデータ処理し、適正空燃比の燃料
量、空気量が得られるように空燃比に影響を及ぼす機器
へ駆動信号を発し空燃比制御を行う方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention detects several states of the engine, processes the data in an electronic control unit, and influences the air-fuel ratio so that the amount of fuel and air at the appropriate air-fuel ratio can be obtained. This invention relates to a method for controlling air-fuel ratios by issuing drive signals to equipment.
従来の技術
例えばエンジンの吸気系に燃料を低圧噴射は
するシステムにおいて、吸入空気量とエンジン回転速度
とによって基本噴射量を決定し。Conventional technology For example, in a system that injects fuel at low pressure into the intake system of an engine, the basic injection amount is determined based on the amount of intake air and the engine rotational speed.
始動、暖機、アイドル、加速、高出力などにおいて吸入
空気温度、エンジン温度、バッテリ電圧などに応じた補
正噴射量を基本噴射量に加算することは周知である。こ
こで、エンジン回転速度に直接または間接に同期するク
ランク軸位置１虞火時期、吸入管圧力、絞シ弁開度など
の要素を検出して制御ユニットへ入力するにあた夛、］
２るサンプル時間毎にこれらの電気信号のサンプリング
を行ってその平均値を求め、制御ユニットにおいて前記
平均値をその後の制御データ値として使用している。It is well known that a correction injection amount according to intake air temperature, engine temperature, battery voltage, etc. is added to the basic injection amount during startup, warm-up, idling, acceleration, high output, etc. Here, elements such as crankshaft position, ignition timing, suction pipe pressure, throttle valve opening, etc. that are directly or indirectly synchronized with engine speed are detected and input to the control unit.]
These electrical signals are sampled every two sampling times to obtain an average value, and the average value is used as a subsequent control data value in the control unit.
前記において９例えばクランク軸の角度または上死点周
期から算出されたサンプル時間によって上死点間の吸入
管圧力信号を成る回数サンプリングし、その平均値
（ｎ：サンプリング回数、Ｐｎニー回の吸入管圧力デー
タ）を制御データ値として使用し噴射量の算出を行うと
、エンジンの過渡状態即ち加速、減速時においても前記
式によって算出された平均値を使用して燃料噴射量が決
定されるので。In the above 9, for example, the suction pipe pressure signal between the top dead center is sampled a certain number of times according to the crankshaft angle or the sample time calculated from the top dead center period, and the average value (n: number of sampling times, Pn knee times of the suction pipe When the injection amount is calculated using the pressure data) as the control data value, the fuel injection amount is determined using the average value calculated by the above formula even in the transient state of the engine, that is, during acceleration and deceleration.
実際の燃料噴射時にはそのときの吸入空気量に対応しな
い燃料が噴射されることとなシ。During actual fuel injection, fuel that does not correspond to the intake air amount at that time will be injected.
過渡状態での追従性が悪く空燃比制御が適正に行われな
い。The followability in transient conditions is poor and air-fuel ratio control is not performed properly.
問題点を解決するための手段
本発明は、エンジンのいくつかの状態を検出して電子式
の制御ユニットでデータ処理し空燃比制御の駆動信号を
発する空燃比制御方法において、エンジン回転速度に同
期した電気信号を制御ユニットへ入力するにあたり。Means for Solving the Problems The present invention provides an air-fuel ratio control method that detects several states of an engine, processes the data in an electronic control unit, and issues a drive signal for air-fuel ratio control. When inputting electrical signals to the control unit.
エンジンが過渡状態にあるときはその直前の一回のサン
プリング値を制御データ値として使用することによって
、前記問題点を解決するための手段とした。When the engine is in a transient state, the previous sampled value is used as the control data value, thereby solving the above problem.
実施例
第１図は本発明の実施例を示すブロック図であって、ク
ランク軸の角度および上列Ａ。Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention, showing the angle of the crankshaft and the upper row A.
吸入管圧力をそれぞれの検知器１．２．３によって検出
し、これら検知器１．２．３が発する電気信号を電子式
の制御ユニット４へ入力しデータ処理して燃料噴射弁９
へ駆動信号を発する。The suction pipe pressure is detected by each detector 1.2.3, and the electrical signals generated by these detectors 1.2.3 are input to the electronic control unit 4 for data processing and the fuel injection valve 9.
Emit a drive signal to.
制御ユニット４は中央処理装置５のほかに％コンバータ
６を有し、吸入管圧力信号はこのヤコンバータ６に送ら
れてサンプリング信号７０周期によって定まるサンプル
時間毎の平均が算出され、これが−回の吸入管圧力デー
タ信号８となって中央処理装置５に入力されるのである
。In addition to the central processing unit 5, the control unit 4 has a % converter 6, and the suction pipe pressure signal is sent to this converter 6, and the average for each sample time determined by 70 periods of the sampling signal is calculated. The suction pipe pressure data signal 8 is input to the central processing unit 5.
上死点信号が例えば第２図Ａのように中央処理装置５へ
入力され、サンプリング信号７が第２図Ｂのような周期
で′（、コンバータ６に送られ、吸入管圧力信号が第２
図Ｃのような形でヘコンバータ６に送られている。上死
点信号は制御データ値として使用する吸入管圧力データ
信号を決定し、また吸入管圧力信号をブロックＡｌ ＊
Ａ２−Ａ３・・・・・・ｋ区画するもので、サンプル時
間毎に算出された吸入管圧力データ信号（第２図Ｄ）の
いくつかが一つのブロックに包含される。For example, the top dead center signal is input to the central processing unit 5 as shown in FIG. 2A, the sampling signal 7 is sent to the converter 6 at the period shown in FIG.
It is sent to the converter 6 in the form shown in Figure C. The top dead center signal determines the suction pipe pressure data signal used as the control data value and also blocks the suction pipe pressure signal Al*
It is divided into A2-A3...k sections, and some of the suction pipe pressure data signals (Fig. 2D) calculated at each sample time are included in one block.
エンジンが定常運転を行っているとき、ブロック＆１に
おける吸入管圧力データＰＨ，Ｐ１２゜としてブロック
ＩＧ２＊＆３においても使用され燃料噴射量の算出を行
う。ブロックＡ ４ においてエンジンが過渡状態とな
シ、吸入管圧力が急激に高くなったとする。このときブ
ロック應４における吸入管圧力データＰ４１．Ｐ４゜。When the engine is in steady operation, the intake pipe pressure data PH, P12° in block &1 are also used in block IG2*&3 to calculate the fuel injection amount. Assume that in block A4, the engine is in a transient state and the suction pipe pressure suddenly increases. At this time, suction pipe pressure data P41. P4゜.
の制御データ値として使用すると、第２図Ｅの二点鎖線
のよりに現在の吸入管圧力に対し著しく低い値で燃料噴
射量の算出を行うこととなる。If this is used as the control data value, the fuel injection amount will be calculated at a value significantly lower than the current intake pipe pressure, as indicated by the two-dot chain line in FIG. 2E.
本発明によると、エンジン回転速度に同期した電気信号
２本実施例においては吸入管圧力データ信号がある一定
以上の変動を示したとき、上死点信号によってその直前
即ち最も新しい吸入管圧力データＰ４４ をブロック高
５の制御データ値として使用するのである。According to the present invention, in this embodiment, when the suction pipe pressure data signal shows a fluctuation of more than a certain level, the immediately preceding or latest suction pipe pressure data P44 is generated by the top dead center signal. is used as the control data value for block height 5.
ブロック撚５以後においてエンジンが定常運転に戻れば
ブロック應５における吸入管圧力データの平均値が以後
の制御データ値として使用される。前述の制御データ値
は第２図Ｅに示されている。If the engine returns to steady operation after block twist 5, the average value of the suction pipe pressure data in block twist 5 is used as the subsequent control data value. The aforementioned control data values are shown in FIG. 2E.
尚、ブロック高５においても過渡状態が続くときは次の
上列店信号の直前の吸入管圧力データをブロック扁６の
制御データ値として使用することは勿論である。Incidentally, when the transient state continues even at the block height 5, it goes without saying that the suction pipe pressure data immediately before the next upper row store signal is used as the control data value for the block platen 6.
尚また。エンジン回転速度に同期した電気信号としては
前記以外の要素を検出して得られる電気信号を用いても
よいことは勿論であ）、更に吸入管圧力の代９に吸入空
気量を直接検出して制御データ値に使用することもでき
る。Also. As an electric signal synchronized with the engine speed, it is of course possible to use an electric signal obtained by detecting elements other than those mentioned above. Can also be used for control data values.
本発明によると、エンジンが過渡状態にあるときに平均
値の代りに直前の一回のサンプリング値を制御データ値
として使用し空燃比制御の駆動信号を発するようにした
ので、エンジン回転速度が急激に変動しても現在の状態
【最も近い制御データ値でデータ処理が行われ、過渡状
態での追従性が良好で適正な空燃比制御を行うことがで
きるものである。According to the present invention, when the engine is in a transient state, the last sampling value is used as the control data value instead of the average value, and the drive signal for air-fuel ratio control is generated, so that the engine speed suddenly increases. Even if the current state fluctuates, data processing is performed using the control data value closest to the current state.Followability in transient states is good, and appropriate air-fuel ratio control can be performed.
第１図は本発明の実施例を示すブロック図。
第２図は各信号の波形図である。
１、２．３・・・・・・検知器、４・・・・・・制御ユ
ニット。
５・・・・・・中央処理装置、６・・・・・・ヤコンバ
ータ。
第１ 箇FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a waveform diagram of each signal. 1, 2.3...Detector, 4...Control unit. 5...Central processing unit, 6...Ya converter. 1st clause
Claims (1)
を発する空燃比制御方法において、エンジン回転速度に
同期した電気信号を制御ユニットへ入力するにあたり、
エンジンが過渡状態にあるときはその直前の一回のサン
プリング値を制御データ値として使用することを特徴と
するエンジンの空燃比制御方法。[Claims] In an air-fuel ratio control method that detects several states of an engine, processes the data in an electronic control unit, and issues a drive signal for air-fuel ratio control, an electric signal synchronized with the engine rotational speed is sent to the control unit. When inputting to
A method for controlling an air-fuel ratio of an engine, characterized in that when the engine is in a transient state, a single sampling value immediately before the transient state is used as a control data value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16319484A JPS6143229A (en) | 1984-08-02 | 1984-08-02 | Air-fuel ratio control method of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16319484A JPS6143229A (en) | 1984-08-02 | 1984-08-02 | Air-fuel ratio control method of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6143229A true JPS6143229A (en) | 1986-03-01 |
Family
ID=15769056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16319484A Pending JPS6143229A (en) | 1984-08-02 | 1984-08-02 | Air-fuel ratio control method of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6143229A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771841A (en) * | 1986-09-30 | 1988-09-20 | Nissan Motor Co., Ltd. | Variable power assist steering system for vehicle |
| US4860846A (en) * | 1986-12-27 | 1989-08-29 | Nissan Motor Co., Ltd. | Vehicle speed responsive variable assist power steering system |
| US4862985A (en) * | 1986-12-27 | 1989-09-05 | Nissan Motor Co., Ltd. | Variable assist power steering system with varying power assist with vehicle speed |
| US4865147A (en) * | 1986-12-27 | 1989-09-12 | Nissan Motor Company, Limited | Hydraulic fluid circuit for variable assist power steering system |
| US4884648A (en) * | 1986-12-27 | 1989-12-05 | Nissan Motor Company, Limited | Variable assist power steering system with varying power assist characteristic |
| US4958695A (en) * | 1986-12-27 | 1990-09-25 | Nissan Motor Company, Limited | Variable assist power steering system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59213931A (en) * | 1983-05-19 | 1984-12-03 | Japan Electronic Control Syst Co Ltd | Electronic control fuel injector for internal-combustion engine |
-
1984
- 1984-08-02 JP JP16319484A patent/JPS6143229A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59213931A (en) * | 1983-05-19 | 1984-12-03 | Japan Electronic Control Syst Co Ltd | Electronic control fuel injector for internal-combustion engine |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4771841A (en) * | 1986-09-30 | 1988-09-20 | Nissan Motor Co., Ltd. | Variable power assist steering system for vehicle |
| US4860846A (en) * | 1986-12-27 | 1989-08-29 | Nissan Motor Co., Ltd. | Vehicle speed responsive variable assist power steering system |
| US4862985A (en) * | 1986-12-27 | 1989-09-05 | Nissan Motor Co., Ltd. | Variable assist power steering system with varying power assist with vehicle speed |
| US4865147A (en) * | 1986-12-27 | 1989-09-12 | Nissan Motor Company, Limited | Hydraulic fluid circuit for variable assist power steering system |
| US4884648A (en) * | 1986-12-27 | 1989-12-05 | Nissan Motor Company, Limited | Variable assist power steering system with varying power assist characteristic |
| US4958695A (en) * | 1986-12-27 | 1990-09-25 | Nissan Motor Company, Limited | Variable assist power steering system |
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