JPH0663465B2 - Electronically controlled fuel injection device for internal combustion engine - Google Patents
Electronically controlled fuel injection device for internal combustion engineInfo
- Publication number
- JPH0663465B2 JPH0663465B2 JP59256285A JP25628584A JPH0663465B2 JP H0663465 B2 JPH0663465 B2 JP H0663465B2 JP 59256285 A JP59256285 A JP 59256285A JP 25628584 A JP25628584 A JP 25628584A JP H0663465 B2 JPH0663465 B2 JP H0663465B2
- Authority
- JP
- Japan
- Prior art keywords
- engine
- fuel supply
- fuel
- throttle valve
- load
- 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
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は内燃機関の減速時に燃料供給を停止するように
した電子制御燃料噴射装置の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an electronically controlled fuel injection device that stops fuel supply when the internal combustion engine is decelerated.
（従来の技術） 機関の減速時の燃費節減をはかるべく、減速時に燃料の
供給を停止するようにしたものが、例えば特公昭54−23
39号公報、特公昭55−4217号公報、特公昭56−37412号
公報などを始めとして、種々提案されている。(Prior Art) In order to reduce fuel consumption during deceleration of an engine, a fuel supply is stopped during deceleration.
Various proposals have been made, including No. 39, Japanese Patent Publication No. 55-4217 and Japanese Patent Publication No. 56-37412.
このような減速時の燃料供給停止をマイクロコンピュー
タにより制御する場合、その機能的な流れを示すと、一
般には第５図のような手順で行なわれる。When the stop of fuel supply during deceleration as described above is controlled by a microcomputer, the functional flow is generally shown in FIG.
まず車速Ｖが所定値Vsp以上であるか否かを判断し、所
定値以上のときは吸気絞弁が全閉時にONとなる絞弁スイ
ッチの信号により、絞弁が全閉状態にあるか否かを判断
する。そして絞弁が全閉のときは機関の回転数Ｎが所定
値Ｎ１以上であるか否かを判断し、このようにしてアイ
ドリングなどの低回転域を除き、回転数が所定値以上で
吸気絞弁が閉じる減速時に燃料の供給を停止するように
なっている。First, it is determined whether or not the vehicle speed V is equal to or higher than a predetermined value Vsp. When the vehicle speed V is equal to or higher than the predetermined value, whether or not the throttle valve is fully closed is determined by a signal from a throttle switch that is turned on when the intake throttle valve is fully closed. To judge. When the throttle valve is fully closed, it is determined whether the engine speed N is equal to or higher than a predetermined value N 1 , and thus the intake speed is equal to or higher than a predetermined value except for a low speed region such as idling. The fuel supply is stopped during deceleration when the throttle valve is closed.
これに対して絞弁スイッチがOFFのときは燃料の供給停
止を行わない。On the other hand, when the throttle switch is OFF, the fuel supply is not stopped.
（発明が解決しようとする問題点） しかしながらこのように回転数が所定値以上で絞弁スイ
ッチがONのときに必ず燃料の供給を停止する構造では、
万一絞弁スイッチのワイヤーハーネスなどの短絡によ
り、絞弁が全閉できないにも拘わらず、誤って絞弁スイ
ッチのON信号が入力されているような場合、機関の回転
数が所定値に達する毎に燃料カットが行なわれてしまう
という問題があった。(Problems to be solved by the invention) However, in such a structure in which the fuel supply is always stopped when the rotation speed is equal to or higher than a predetermined value and the throttle valve switch is ON,
In the unlikely event that the throttle valve cannot be fully closed due to a short circuit of the throttle valve wire harness, but the ON signal of the throttle switch is erroneously input, the engine speed reaches the specified value. There was a problem that fuel was cut every time.
本発明はこのような問題を解決することを目的とするも
のである。The present invention aims to solve such problems.
（問題点を解決するための手段） そこで本発明は、第１図に示すように、例えば絞弁開度
センサ２からの信号に基づいて機関に対する要求負荷が
無いことを検出したときに燃料供給を停止する燃料供給
停止手段３と、回転センサ１からの信号に基づいて機関
回転数の増加率を検出する回転数増加率検出手段４と、
機関の吸入空気量もしくはこれに対応する燃料量に基づ
いて実際の負荷状態を検出するエアフロメータ等からな
る負荷検出手段５と、前記検出した回転数増加率がゼロ
もしくは所定の正の値以上でかつ検出した実負荷が所定
値以上の条件を満足したときには前記燃料供給の停止条
件が満たされていても燃料供給停止を解除する停止条件
解除手段６とを備えるようにした。なお、７は回転数検
出手段１と負荷検出手段５の信号にもとづいて燃料の噴
射パルス幅を演算する噴射量演算手段、８はこの演算結
果により燃料噴射弁９を駆動する噴射弁駆動手段であ
る。(Means for Solving Problems) Therefore, according to the present invention, as shown in FIG. 1, fuel supply is performed when it is detected that there is no required load on the engine based on a signal from the throttle valve opening sensor 2, for example. A fuel supply stopping means 3 for stopping the engine speed;
If the load detecting means 5 including an air flow meter or the like for detecting an actual load state based on the intake air amount of the engine or the fuel amount corresponding to the intake air amount, and the detected rotational speed increase rate is zero or a predetermined positive value or more. Further, the stop condition canceling means 6 is provided for canceling the stop of the fuel supply even when the condition for stopping the fuel supply is satisfied when the detected actual load satisfies the condition of a predetermined value or more. Reference numeral 7 is an injection amount calculation means for calculating the injection pulse width of the fuel based on the signals from the rotation speed detection means 1 and the load detection means 5, and 8 is an injection valve drive means for driving the fuel injection valve 9 based on the calculation result. is there.
（作用） したがって、検出信号としては所定の機関減速状態を出
力していても、回転数が一定ないしは増加中のときや、
機関が無負荷状態ではないときは、正規の減速状態では
ないと判断して燃料カットを行わない。(Effect) Therefore, even when the predetermined engine deceleration state is output as the detection signal, when the rotation speed is constant or increasing,
When the engine is not in the no-load state, it is determined that the engine is not in the normal deceleration state and fuel cut is not performed.
このため、絞弁スイッチなど絞弁開度検出手段が誤動作
しても、所定の減速状態以外は燃料の供給が停止される
ようなことがなく、運転性の向上がはかれる。Therefore, even if the throttle valve opening detection means such as the throttle switch malfunctions, the fuel supply is not stopped except in the predetermined deceleration state, and the drivability is improved.
（実施例） 以下本発明の実施例を第２図にもとづいて説明する。(Embodiment) An embodiment of the present invention will be described below with reference to FIG.
図中10は機関本体、11は吸気通路であり、吸気通路11の
途中には吸気絞弁12が介装される。絞弁12の上流には機
関の負荷を検出する手段としてエアフローメータ13が取
付られるが、これに代えて、あるいはこれと共に絞弁12
の下流の吸入負圧を検出する圧力センサ14を設ける。In the figure, 10 is an engine body, 11 is an intake passage, and an intake throttle valve 12 is provided in the middle of the intake passage 11. An air flow meter 13 is installed upstream of the throttle valve 12 as a means for detecting the load on the engine, but instead of or together with this, the throttle valve 12
A pressure sensor 14 for detecting the suction negative pressure on the downstream side is provided.
前記絞弁12の開度検出手段として、絞弁12の全閉を検出
する絞弁スイッチ15が設けられ、また機関の回転数を検
出するためにクランク角度センサ16が設けられる。A throttle valve switch 15 for detecting the fully closed state of the throttle valve 12 is provided as an opening detection means of the throttle valve 12, and a crank angle sensor 16 is provided for detecting the rotational speed of the engine.
前記エアフローメータ13、圧力センサ14、絞弁スイッチ
15、クランク角度センサ16の各検出信号は制御装置17に
入力する。Air flow meter 13, pressure sensor 14, throttle valve switch
The detection signals of the crank angle sensor 16 and the crank angle sensor 16 are input to the controller 17.
制御装置17はマイクロコンピュータなどで構成され、機
関の運転状態に応じて燃料噴射弁18から噴射供給される
燃料量を制御する。The control device 17 is composed of a microcomputer or the like, and controls the amount of fuel injected and supplied from the fuel injection valve 18 according to the operating state of the engine.
つまり、基本的には機関の負荷（吸入空気量）と回転数
にもとづいて、所定の空燃比がえられるように燃料の噴
射量を演算し、燃料噴射弁18に機関回転に同期して燃料
噴射パルスを出力する一方、機関の減速時は第３図のよ
うにして燃料の噴射を停止させる。That is, basically, the fuel injection amount is calculated based on the engine load (intake air amount) and the number of revolutions so that a predetermined air-fuel ratio can be obtained, and the fuel injection valve 18 is operated in synchronization with the engine revolution. While outputting the injection pulse, when the engine is decelerating, the fuel injection is stopped as shown in FIG.
すなわち、検出した機関回転数Ｎが所定値Ｎ１以上か否
かを判定し、所定値以上のときは絞弁スイッチ15がONか
OFFかをみる。絞弁12が全閉でないとき、つまり絞弁ス
イッチ15がOFFのときは燃料カットを行わない。That is, it is determined whether or not the detected engine speed N is a predetermined value N 1 or more.
Check if it is OFF. When the throttle valve 12 is not fully closed, that is, when the throttle valve 15 is OFF, fuel cut is not performed.
これに対して絞弁スイッチ15がONのときは、機関回転数
の増加率（換言すると変化率）dN／dTを演算し、これが
所定値Ｋ１以上か否かを判定し、以下のときは所定の減
速状態であると判断して燃焼噴射を停止する。なお、こ
の所定値Ｋ１はゼロまたは実験等で求めた適当な正の値
とする。On the other hand, when the throttle switch 15 is ON, the rate of increase in engine speed (in other words, the rate of change) dN / dT is calculated, and it is determined whether or not this is a predetermined value K 1 or more. When it is determined that the vehicle is in the predetermined deceleration state, the combustion injection is stopped. The predetermined value K 1 is zero or an appropriate positive value obtained by experiments or the like.
これに対して増加率が所定値Ｋ１以上のときは、エアフ
ローメータ13の出力から機関の負荷Qaがアイドリング時
の負荷値よりもやや大きい所定値Qk以上か否かを判定
し、負荷が所定値以下のときは燃料噴射を停止する。On the other hand, when the increase rate is equal to or higher than the predetermined value K 1 , it is determined from the output of the air flow meter 13 whether the engine load Qa is equal to or higher than a predetermined value Qk which is slightly larger than the idling load value. When it is less than the value, fuel injection is stopped.
急な下り坂走行時など絞弁全閉であっても車速が増加す
ることがあり、これに伴って機関回転数も増加するが、
このような場合は燃料カットを行う必要がある。The vehicle speed may increase even when the throttle valve is fully closed, such as when driving on a steep downhill, and the engine speed also increases accordingly.
In such a case, it is necessary to cut the fuel.
しかし、この負荷が所定値Qkよりも大きいとき、つま
り、絞弁全閉信号が入力しているにも拘わらず、機関の
回転数は増加しつつあり、しかも吸入空気量も所定値以
上であるようなときは、実質的に機関が減速状態にある
とは想定できないので、この場合には燃料の噴射を停止
しない。However, when this load is larger than the predetermined value Qk, that is, the throttle valve fully closed signal is input, the engine speed is increasing and the intake air amount is also the predetermined value or more. In such a case, it cannot be assumed that the engine is substantially in the deceleration state, and in this case, the fuel injection is not stopped.
見掛け上は所定の減速状態にあっても、実際は機関が所
定以上の負荷運転をしている場合は、絞弁開度信号は全
閉を検出したとしても、何等かの異常があると考えた方
がよく、本発明ではこのようなときは燃料供給の停止を
解除、すなわち燃料カットをせずに機関の出力を確保
し、円滑な運転性を維持するのである。Even if the engine is operating in a predetermined deceleration condition, if the engine is actually operating with a load higher than the specified value, it is considered that there is something wrong with the throttle valve opening signal, even if it is detected as fully closed. In the present invention, the stop of the fuel supply is released, that is, the output of the engine is secured without cutting the fuel in such a case, and the smooth drivability is maintained.
絞弁スイッチ15が故障あるいは誤動作により、吸気絞弁
12が全閉していないにも拘わらずON信号を出力したよう
な場合、従来は所定の減速条件が検出されれば必ず燃料
カットを行うため、運転性が損なわれていたが、本発明
ではこのようなときに、絞弁スイッチ15からの信号は絞
弁全閉を検出していても、実際に機関の負荷や回転数の
変化率をみながら正規の減速状態にあるのかどうかの判
断を下すため、減速状態でないにも拘わらず燃料をカッ
トするような事態を確実に回避することができるのであ
る。Intake throttle valve 15 may malfunction due to malfunction or malfunction of throttle switch 15.
In the case where the ON signal is output despite that 12 is not fully closed, conventionally, the fuel cut is always performed when the predetermined deceleration condition is detected, so the drivability is impaired. In such a case, even if the signal from the throttle switch 15 detects that the throttle valve is fully closed, it is possible to judge whether or not the engine is in the normal deceleration state by actually checking the load of the engine and the rate of change of the rotational speed. Therefore, it is possible to surely avoid a situation in which the fuel is cut even though the vehicle is not in the decelerated state.
次に第４図の実施例を説明すると、これはブレーキが踏
み込まれ、ブレーキランプスイッチがONとなったときは
燃料カットを行う機能を追加したもので、これにより急
な下り坂の判定などが確実になり、この場合には機関の
負荷の判定を削除することも可能である。Next, to explain the embodiment of FIG. 4, this is the addition of a function to cut off the fuel when the brake is depressed and the brake lamp switch is turned on. Being certain, in this case it is also possible to eliminate the load judgment of the engine.
つまり、機関の回転数Ｎが所定値Ｎ１以上で絞弁スイッ
チがONのとき、ブレーキランプスイッチがONならば、そ
くざに燃料の供給を停止するのである。なお、ブレーキ
ランプスイッチがOFFのときは、前記第３図と同様な制
御が行なわれる。That is, when the engine speed N is equal to or higher than the predetermined value N 1 and the throttle valve switch is ON, and the brake lamp switch is ON, the fuel supply is stopped. When the brake lamp switch is off, the same control as in FIG. 3 is performed.
（発明の効果） 以上のように本発明によれば、機関の回転数が一定ない
し増加しつつあり、かつ負荷がかかっているときには、
減速状態の検出信号が出力されていても、燃料の供給停
止を解除するようにしたので、絞弁開度センサなどの誤
動作により減速時以外に絞弁全閉信号が入力しても、燃
料の供給が断続され、機関の出力性能を確保することが
できるという効果がある。(Effects of the Invention) As described above, according to the present invention, when the engine speed is constant or increasing and a load is applied,
Even if the deceleration state detection signal is output, the stop of fuel supply is canceled, so even if the throttle valve fully closed signal is input at times other than deceleration due to malfunction of the throttle valve opening sensor etc. There is an effect that supply of power is interrupted and the output performance of the engine can be secured.
また、本発明では燃料噴射装置の基本的構成として当初
から備えている回転センサ及びエアフローメータ等から
の出力に基づいて異常を判別することができるので、既
存の燃料噴射装置に大幅な変更を加えることなく低コス
トで上記フェイルセイフの機能を実現できるという効果
も得られる。Further, in the present invention, since it is possible to determine the abnormality based on the outputs from the rotation sensor, the air flow meter, etc., which are originally provided as the basic configuration of the fuel injection device, the existing fuel injection device is significantly modified. It is also possible to obtain the effect that the fail-safe function can be realized at low cost.
第１図は本発明の全体構成図、第２図は本発明の実施例
の構成図、第３図、第４図はそれぞれ制御装置の制御動
作を示すフローチャートである。 第５図は従来の制御動作を示すフローチャートである。 １……回転数検出手段、２……絞弁開度検出手段、３…
…燃料供給停止手段、４……回転数増加率検出手段、５
……負荷検出手段、６……停止解除手段、７……噴射量
演算手段、９……燃料噴射弁。FIG. 1 is an overall configuration diagram of the present invention, FIG. 2 is a configuration diagram of an embodiment of the present invention, and FIGS. 3 and 4 are flowcharts showing the control operation of the control device, respectively. FIG. 5 is a flowchart showing a conventional control operation. 1 ... Rotation speed detecting means, 2 ... Throttle valve opening detecting means, 3 ...
... Fuel supply stopping means, 4 ... Rotational speed increase rate detecting means, 5
...... Load detection means, 6 ... Stop release means, 7 ... Injection amount calculation means, 9 ... Fuel injection valve.
Claims (1)
たときに燃料供給を停止する燃料供給停止手段と、機関
回転数の増加率を検出する回転数増加率検出手段と、機
関の吸入空気量もしくはこれに対応する燃料量に基づい
て実際の負荷状態を検出する負荷検出手段と、前記検出
した回転数増加率がゼロもしくは所定の正の値以上でか
つ検出した実負荷が所定値以上の条件を満足したときに
は前記燃料供給の停止条件が満たされていても燃料供給
停止を解除する停止条件解除手段とを備えたことを特徴
とする内燃機関の電子制御燃料噴射装置。1. A fuel supply stop means for stopping fuel supply when it detects that there is no required load on the engine, a rotational speed increase rate detecting means for detecting an increase rate of the engine rotational speed, and an intake air amount of the engine. Alternatively, load detection means for detecting an actual load state based on the corresponding fuel amount, and a condition in which the detected rotational speed increase rate is zero or a predetermined positive value or more and the detected actual load is a predetermined value or more. And a stop condition canceling means for canceling the fuel supply stop even if the fuel supply stop condition is satisfied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59256285A JPH0663465B2 (en) | 1984-12-04 | 1984-12-04 | Electronically controlled fuel injection device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59256285A JPH0663465B2 (en) | 1984-12-04 | 1984-12-04 | Electronically controlled fuel injection device for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61135949A JPS61135949A (en) | 1986-06-23 |
| JPH0663465B2 true JPH0663465B2 (en) | 1994-08-22 |
Family
ID=17290523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59256285A Expired - Lifetime JPH0663465B2 (en) | 1984-12-04 | 1984-12-04 | Electronically controlled fuel injection device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0663465B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59190448A (en) * | 1983-04-11 | 1984-10-29 | Honda Motor Co Ltd | Fuel feed control method for internal-combustion engine |
| JPS59213930A (en) * | 1983-05-19 | 1984-12-03 | Japan Electronic Control Syst Co Ltd | Electronic control fuel injector for internal-combustion engine |
-
1984
- 1984-12-04 JP JP59256285A patent/JPH0663465B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61135949A (en) | 1986-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |