JPH0735739B2 - Electronic fuel injection method - Google Patents
Electronic fuel injection methodInfo
- Publication number
- JPH0735739B2 JPH0735739B2 JP61109581A JP10958186A JPH0735739B2 JP H0735739 B2 JPH0735739 B2 JP H0735739B2 JP 61109581 A JP61109581 A JP 61109581A JP 10958186 A JP10958186 A JP 10958186A JP H0735739 B2 JPH0735739 B2 JP H0735739B2
- Authority
- JP
- Japan
- Prior art keywords
- throttle opening
- fuel injection
- opening sensor
- correction
- intake pipe
- 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 - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims description 30
- 238000002347 injection Methods 0.000 title claims description 19
- 239000007924 injection Substances 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 19
- 230000001133 acceleration Effects 0.000 claims description 13
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 230000005856 abnormality Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明は電子式燃料噴射方法、特に吸入管負圧、スロッ
トル弁開度及びエンジン回転数をパラメータとして加速
制御を行なう際の電子式燃料噴射方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electronic fuel injection method, and more particularly, when performing acceleration control with negative intake pipe pressure, throttle valve opening and engine speed as parameters. And an electronic fuel injection method.
(従来の技術) 点火式内燃機関(以下エンジンと称す)の燃料制御とし
ては、エンジンの吸入管負圧とエンジン回転数とを用い
たスピード・デンシティ方式(以下S/D方式と称す)
と、スロットル弁の開度位置とエンジン回転数とを用い
たスピード・スロットル方式(以下S/TR方式と称す)と
がある。これらの各方式は夫々の条件を入力して、基本
燃料噴射量を求め、これにエンジンの運用状態に応じた
補正量を加味して、最終噴射量としている。(Prior Art) As a fuel control of an ignition type internal combustion engine (hereinafter referred to as an engine), a speed / density method (hereinafter referred to as S / D method) using a negative pressure in an intake pipe of the engine and an engine speed
There is a speed / throttle method (hereinafter referred to as S / TR method) that uses the opening position of the throttle valve and the engine speed. Each of these methods inputs respective conditions, obtains a basic fuel injection amount, and adds a correction amount according to the operating state of the engine to the final fuel injection amount.
そして、最近では電子式燃料噴射装置が開発され、前記
各原理を利用して種々な燃料制御方式が提案されてい
る。Recently, an electronic fuel injection device has been developed, and various fuel control systems have been proposed by utilizing the above-mentioned principles.
第4図によって、従来の燃料制御方式の一例を説明す
る。第4図は特開昭57−52640号公報に記載されたもの
を機能ブロック図として表現したものである。An example of a conventional fuel control system will be described with reference to FIG. FIG. 4 is a functional block diagram of what is described in JP-A-57-52640.
上記従来例の基本的な考え方は、マトリクスメモリ41
(以下第1ROMと称す)、42(以下第2ROMと称す)の二つ
を用意し、このうちの第1ROM41には、エンジン回転数Ne
(以下Neと称す)とスロットル弁開度QTR(以下QTRと称
す)とをパラメータとした基本燃料噴射量をメモリし、
第2ROM42にはNeと吸入管圧力PB(以下PBと称す)とをパ
ラメータとした基本燃料噴射量をメモリする。The basic idea of the above conventional example is that the matrix memory 41
(Hereinafter referred to as the first ROM) and 42 (hereinafter referred to as the second ROM) are prepared. Of these, the first ROM 41 has an engine speed Ne.
(Hereinafter referred to as Ne) and throttle valve opening Q TR (hereinafter referred to as Q TR ) are stored in the basic fuel injection amount as parameters,
The second ROM 42 stores the basic fuel injection amount with Ne and the suction pipe pressure P B (hereinafter referred to as P B ) as parameters.
そして、エンジンの比較的低負荷領域では第2ROMを用
い、又、その他の高負荷領域では第1ROMを用いて夫々燃
料噴射を行なう方式であり、その場合、スロットル開度
センサ異常検出手段43がスロットル異常を検出した場合
には、前記負荷条件に拘らず、切換手段44を用いて第1R
OMから第2ROMへ切換えて、エンジンの全運転領域にわた
って第2ROMを用いて運転しようとするものである。The second ROM is used in the relatively low load region of the engine, and the first ROM is used in the other high load region. In this case, the throttle opening sensor abnormality detection means 43 uses the throttle When an abnormality is detected, the switching means 44 is used to switch to the first R regardless of the load condition.
It is intended to switch from OM to the second ROM and operate using the second ROM over the entire operating region of the engine.
(発明が解決しようとする問題点) 上記し従来方式の場合、各ROMにメモリされているもの
は、各パラメータに応じた基本燃料噴射量であって、例
えば加速補正対策はなされていない。従って、加速時の
ドライバビリティが悪い欠点を有している。(Problems to be Solved by the Invention) In the above-mentioned conventional method, what is stored in each ROM is the basic fuel injection amount corresponding to each parameter, and, for example, no acceleration correction measure is taken. Therefore, there is a drawback that drivability during acceleration is poor.
本発明は、上記問題点を解決するためになされたもので
あり、スロットル開度センサの異常が検出された後にお
いても、加速補正のバックアップの可能な電子式燃料噴
射方法を提供することを目的としている。The present invention has been made to solve the above problems, and an object thereof is to provide an electronic fuel injection method capable of backing up acceleration correction even after an abnormality of a throttle opening sensor is detected. I am trying.
[発明の構成] (問題点を解決するための手段) 上記目的を達成するため、本発明では吸入管圧力とエン
ジン回転数とを基に、エンジンの所定運用条件に応じた
基本燃料量を演算し、この基本燃料量に対してスロット
ル開度の微分値による補正を行なう電子式燃料噴射方法
において、エンジン回転数に対応する吸入管絶対圧を複
数の各スロットル開度毎に求めて等スロットル開度曲線
を予め設定しておき、前記スロットル開度センサからの
出力値が前記設定値を中心とした所定幅内に入らないと
き、スロットル開度センサ異常と判断して燃料補正の内
の加速補正のみをスロットル開度微分値から吸入管圧力
微分値に切換えるよう構成した。[Structure of the Invention] (Means for Solving Problems) In order to achieve the above object, the present invention calculates a basic fuel amount according to a predetermined operating condition of an engine based on an intake pipe pressure and an engine speed. However, in the electronic fuel injection method that corrects this basic fuel amount by the differential value of the throttle opening, the absolute absolute value of the intake pipe corresponding to the engine speed is obtained for each of the multiple throttle openings, and the equal throttle opening is performed. If the output value from the throttle opening sensor does not fall within the predetermined range centered on the set value, the throttle opening sensor is determined to be abnormal and the acceleration correction of the fuel correction is performed. Only the throttle opening differential value is changed to the intake pipe pressure differential value.
(作用) 従って予め求めてある等スロットル開度曲線(これには
バラツキ対策として所定幅を設けてある)内にスロット
ル開度が入っていなければスロットル開度センサ異常と
判断し、加速補正のみをスロットル開度微分値による補
正から吸入管圧力微分値による補正に切換えるようにし
ている。(Operation) Therefore, if the throttle opening does not fall within the predetermined throttle opening curve (which has a predetermined width as a countermeasure against variations), it is determined that the throttle opening sensor is abnormal and only the acceleration correction is performed. The correction based on the differential value of the throttle opening is switched to the correction based on the differential value of the suction pipe pressure.
(実施例) 以下、図面を参照して本発明の実施例を説明する。第1
図は、本発明による電子式燃料噴射方法を説明するため
の一実施例の機能ブロック構成図である。Embodiments Embodiments of the present invention will be described below with reference to the drawings. First
FIG. 1 is a functional block configuration diagram of an embodiment for explaining an electronic fuel injection method according to the present invention.
第1図において、1は加速演算回路でスロットル開度微
分演算手段11、吸入管圧力微分演算手段12、スロットル
開度センサ異常検出手段43−1及び切換手段44−1から
なっている。13は基本燃料演算手段で、エンジン回転数
Neと吸入管圧力PBとから演算する。In FIG. 1, reference numeral 1 denotes an acceleration calculation circuit which comprises a throttle opening differential calculating means 11, an intake pipe pressure differential calculating means 12, a throttle opening sensor abnormality detecting means 43-1 and a switching means 44-1. 13 is a basic fuel calculation means, the engine speed
Calculate from Ne and suction pipe pressure P B.
第2図はスロットル開度センサの異常検出を説明する図
であり、等スロットル開度曲線から検出する。FIG. 2 is a diagram for explaining abnormality detection of the throttle opening sensor, which is detected from an equal throttle opening curve.
即ち、縦軸に吸入管絶対圧力をとり、横軸にエンジン回
転数をとってスロットル開度との関係を示している。That is, the vertical axis represents the intake pipe absolute pressure, and the horizontal axis represents the engine speed, showing the relationship with the throttle opening.
図から明らかなように、エンジン回転数と吸入管絶対圧
力とによりスロットル開度が或る程度予測出来ることが
わかる。そこで、エンジン回転数と吸入管絶対圧力とに
より、スロットル開度センサの出力値を予め設定してお
き、その設定値幅内に前記したスロットル開度センサの
出力値が入っているか否かを検出することにより、スロ
ットル開度センサの異常を検出しようとするものであ
る。As is apparent from the figure, the throttle opening can be predicted to some extent based on the engine speed and the absolute pressure of the suction pipe. Therefore, the output value of the throttle opening sensor is preset based on the engine speed and the absolute pressure of the intake pipe, and it is detected whether or not the output value of the throttle opening sensor is within the set value range. Thus, the abnormality of the throttle opening sensor is to be detected.
第3図は動作説明のフローチャートである。FIG. 3 is a flow chart for explaining the operation.
第3図において、ステップ31ではエンジン回転数Neと吸
入管圧力PBとから基本燃料Qを演算する。ステップ32で
は、前記した第2図の等スロットル開度曲線を用いてス
ロットル開度センサの異常を検出する。In FIG. 3, in step 31, the basic fuel Q is calculated from the engine speed Ne and the suction pipe pressure P B. In step 32, the abnormality of the throttle opening sensor is detected using the equal throttle opening curve shown in FIG.
ここで、異常がなければステップ33へ進み、スロットル
開度センサの微分演算により補正係数αを求め、補正量
Q′を算出してステップ35にて噴射する。Here, if there is no abnormality, the process proceeds to step 33, the correction coefficient α is obtained by the differential operation of the throttle opening sensor, the correction amount Q ′ is calculated, and the injection is performed at step 35.
一方、ステップ32において、スロットル開度センサの異
常が検出されるとステップ34へ進み、吸入管圧力の微分
演算により補正係数βを求め、補正量Q′を算出してス
テップ35にて噴射する。ステップ35の処理終了後は、ス
テップ31へ戻って以上の操作を繰返す。On the other hand, at step 32, when an abnormality of the throttle opening sensor is detected, the routine proceeds to step 34, where a correction coefficient β is obtained by differentiating the suction pipe pressure, a correction amount Q ′ is calculated, and injection is carried out at step 35. After the process of step 35 ends, the process returns to step 31 and the above operation is repeated.
以上のように本実施例によれば、スロットル開度センサ
の異常時には、基本燃料噴射量とは無関係に加速補正を
スロットル微分から吸入管圧力微分へ切換えることが可
能であって、極めて運転性能の向上が達成できる。As described above, according to the present embodiment, when the throttle opening sensor is abnormal, it is possible to switch the acceleration correction from the throttle differential to the intake pipe pressure differential regardless of the basic fuel injection amount. Improvement can be achieved.
そして本方式を用いると、スロットル開度センサのどの
開度が異常かが判別できる。したがって異常な開度を通
過する加減速にはスロットル開度センサの出力を使わず
に、圧力による補正値を使用することができる。要する
にスロットル開度センサの異常検出開度により、圧力に
よる補正とスロットル開度による補正を使い分けること
が可能となる。この意味はスロットル開度センサを使っ
た補正の方が応答性が速いため、できるだけスロットル
開度センサによる補正を使いたいと言う意図があるため
である。Using this method, it is possible to determine which opening of the throttle opening sensor is abnormal. Therefore, for acceleration / deceleration passing through an abnormal opening, the correction value based on the pressure can be used without using the output of the throttle opening sensor. In short, it is possible to selectively use the correction by the pressure and the correction by the throttle opening depending on the abnormality detection opening of the throttle opening sensor. This means that the correction using the throttle opening sensor has a quicker responsiveness, and the intention is to use the correction using the throttle opening sensor as much as possible.
[発明の効果] 以上説明した如く、本発明によればあくまでも基本燃料
は、回転数と吸入管圧力とで演算し、スロットル開度セ
ンサ異常時のみ加速補正を圧力微分に切換えるようにし
たので、定常運転時は勿論のこと、加速補正も充分に行
なわれ、運転性能の向上した電子式燃料噴射方法を提供
できる。[Effects of the Invention] As described above, according to the present invention, the basic fuel is calculated based on the rotation speed and the suction pipe pressure, and the acceleration correction is switched to the pressure differential only when the throttle opening sensor is abnormal. Not only during steady operation, but also acceleration correction is sufficiently performed, and an electronic fuel injection method with improved operation performance can be provided.
第1図は本発明による電子式燃料噴射方法を説明するた
めの一実施例の機能ブロック構成図、第2図はスロット
ル開度センサの異常を検出する等スロットル開度曲線
図、第3図は動作説明のフローチャート、第4図は従来
装置を説明する一構成例図である。1 ……加速演算回路 11……スロットル開度微分演算手段 12……吸入管圧力微分演算手段 13……基本燃料演算手段 41……第1ROM、42……第2ROM 43、43−1……スロットル開度センサ異常検出手段 44、44−1……切換手段FIG. 1 is a functional block configuration diagram of an embodiment for explaining an electronic fuel injection method according to the present invention, FIG. 2 is a throttle opening curve diagram for detecting abnormality of a throttle opening sensor, and FIG. FIG. 4 is a flow chart for explaining the operation, and FIG. 1 ... Acceleration calculation circuit 11 ... Throttle opening differential calculation means 12 ... Suction pipe pressure differential calculation means 13 ... Basic fuel calculation means 41 ... First ROM, 42 ... Second ROM 43, 43-1 ... Throttle Opening sensor abnormality detection means 44, 44-1 ... switching means
Claims (1)
ンジンの所定運用条件に応じた基本燃料量を演算し、こ
の基本燃料量に対してスロットル開度の微分値による補
正を行なう電子式燃料噴射方法において、エンジン回転
数に対応する吸入管絶対圧を複数の各スロットル開度毎
に求めて等スロットル開度曲線を予め設定しておき、前
記スロットル開度センサからの出力値が前記設定値を中
心とした所定幅内に入らないとき、スロットル開度セン
サ異常と判断して燃料補正の内の加速補正のみをスロッ
トル開度微分値から吸入管活力微分値に切換えることを
特徴とする電子式燃料噴射方法。1. An electronic device for calculating a basic fuel amount according to a predetermined operating condition of an engine on the basis of an intake pipe pressure and an engine speed, and correcting the basic fuel amount by a differential value of a throttle opening. In the fuel injection method, the intake pipe absolute pressure corresponding to the engine speed is obtained for each of a plurality of throttle openings, and an equal throttle opening curve is set in advance, and the output value from the throttle opening sensor is When it does not fall within the predetermined range centered on the set value, it is judged that the throttle opening sensor is abnormal and only the acceleration correction of the fuel correction is switched from the throttle opening differential value to the intake pipe vitality differential value. Electronic fuel injection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61109581A JPH0735739B2 (en) | 1986-05-15 | 1986-05-15 | Electronic fuel injection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61109581A JPH0735739B2 (en) | 1986-05-15 | 1986-05-15 | Electronic fuel injection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62267542A JPS62267542A (en) | 1987-11-20 |
| JPH0735739B2 true JPH0735739B2 (en) | 1995-04-19 |
Family
ID=14513896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61109581A Expired - Lifetime JPH0735739B2 (en) | 1986-05-15 | 1986-05-15 | Electronic fuel injection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0735739B2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58148238A (en) * | 1982-02-25 | 1983-09-03 | Toyota Motor Corp | Electron control fuel injection method for internal- combustion engine |
| JPS60187725A (en) * | 1984-03-08 | 1985-09-25 | Mitsubishi Motors Corp | Controlling device of engine |
| JPS60222544A (en) * | 1984-04-18 | 1985-11-07 | Mitsubishi Motors Corp | Throttle sensor trouble deciding device |
| JPS60224951A (en) * | 1984-04-24 | 1985-11-09 | Mitsubishi Motors Corp | Engine fuel feeder |
-
1986
- 1986-05-15 JP JP61109581A patent/JPH0735739B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62267542A (en) | 1987-11-20 |
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