JPS58214630A - Electronically controlled fuel injection device - Google Patents

Electronically controlled fuel injection device

Info

Publication number
JPS58214630A
JPS58214630A JP9756382A JP9756382A JPS58214630A JP S58214630 A JPS58214630 A JP S58214630A JP 9756382 A JP9756382 A JP 9756382A JP 9756382 A JP9756382 A JP 9756382A JP S58214630 A JPS58214630 A JP S58214630A
Authority
JP
Japan
Prior art keywords
increase
circuit
fuel injection
signal
open degree
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
Application number
JP9756382A
Other languages
Japanese (ja)
Inventor
「あ」　芳樹
Yoshiki Yuzuriha
Hiromitsu Yamaura
山浦　弘光
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.)
Hitachi Unisia Automotive Ltd
Original Assignee
Japan Electronic Control Systems Co Ltd
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 Japan Electronic Control Systems Co Ltd filed Critical Japan Electronic Control Systems Co Ltd
Priority to JP9756382A priority Critical patent/JPS58214630A/en
Publication of JPS58214630A publication Critical patent/JPS58214630A/en
Pending legal-status Critical Current

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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires

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  • 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)

Abstract

PURPOSE:To effectively prevent chattering, by providing such an arrangement that a range of increase in fuel amount is judged in accordance with the open degree of the throttle valve, hysterisis is given to the initial and complete points of the increase, and the rate of the increase is determined in accordance with the rotational speed of an engine. CONSTITUTION:A first comparator circuit 15 issues an H-level signal when the open degree of throttle valve is larger than a first predetermined open degree alpha1. Further, a second comparator circuit 16 issues an H-level signal when the open degree of the throttle valve is less than a second predetermined open degree alpha2. A flip-flop circuit 17 is reset by the first and second comparator circuits. Thereby, the characteristics of increase in fuel amount may have hysterisis. A fuel amount increase compensating circuit 12 converts a fuel injection amount signal S2 which is computed by an arithmetic circuit 6, into a pulse width (1+K). Pw, where K is the rate of the increase which varies in accordance with the rotational speed of the engine. Thereby, chattering may be prevented.

Description

【発明の詳細な説明】 本発明は内燃機関の電子制御燃料噴射装置に関し、特に
高負荷時に燃料噴射量を増量補正する装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronically controlled fuel injection system for an internal combustion engine, and more particularly to a system for increasing the amount of fuel to be injected during high loads.

内燃機関の電子制御燃料噴射装置は、主に機関の吸入空
気量に基づいたパルス幅のパルス信号を算出し、そのパ
ルス信号によって電磁式燃料噴射弁を駆動して機関へ間
欠的に燃料を供給するものである。An electronically controlled fuel injection system for an internal combustion engine calculates a pulse signal with a pulse width based mainly on the intake air amount of the engine, and uses that pulse signal to drive an electromagnetic fuel injection valve to intermittently supply fuel to the engine. It is something to do.

かかる電子制御燃料噴射装置の従来例を第１図を参照し
て説明する。A conventional example of such an electronically controlled fuel injection device will be explained with reference to FIG.

機関１の点火コイル２から得られる点火信号Ｓ１と、吸
気通路３に設けた吸入空気量検出器４から得られる吸入
空気量信号Ｓ２とが、コントロールユニット５の燃料噴
射量演算回路６に入力され、演算回路６で演算された燃
料噴射量信号（基本パルス信号）Ｓ３が増量補正回路７
を介して燃料噴射弁駆動回路８に送られる。An ignition signal S1 obtained from the ignition coil 2 of the engine 1 and an intake air amount signal S2 obtained from the intake air amount detector 4 provided in the intake passage 3 are input to the fuel injection amount calculation circuit 6 of the control unit 5. , the fuel injection amount signal (basic pulse signal) S3 calculated by the calculation circuit 6 is sent to the increase correction circuit 7.
It is sent to the fuel injection valve drive circuit 8 via.

ここで、増量補正回路７の非作動時には、演算回路６で
演算された燃料噴射量信号Ｓ３がそのまま駆動回路８に
入力され、駆動回路８は入力される燃料噴射量信号Ｓ３
に基づいて燃料噴射弁９を駆動するための駆動パルス信
号Ｓ４を形成し、燃料噴射弁９に出力する。Here, when the increase correction circuit 7 is not operating, the fuel injection amount signal S3 calculated by the calculation circuit 6 is directly inputted to the drive circuit 8, and the drive circuit 8 receives the input fuel injection amount signal S3.
A drive pulse signal S4 for driving the fuel injector 9 is formed based on this, and is output to the fuel injector 9.

増量補正回路７はスロットル弁１０が所定開度以上にな
ったことを検出するスロットルスイッチ１１により所定
開度具」−（高負荷域）で作動し、演算回路６から駆動
回路８に入力される信号を増大させるようになっている
。即ち、燃料噴射量信号ｓ３のパルス幅をＰｗとしたと
き、（１＋Ｋ）　　・Ｐｗのパルス幅をもつ信号Ｓ５を
駆動回路８に入力させるようになっている。尚、Ｋば一
定の増量率である。The increase correction circuit 7 is operated at a predetermined opening level - (high load range) by the throttle switch 11 which detects that the throttle valve 10 has reached a predetermined opening level or more, and is inputted from the calculation circuit 6 to the drive circuit 8. It is designed to increase the signal. That is, when the pulse width of the fuel injection amount signal s3 is Pw, a signal S5 having a pulse width of (1+K)·Pw is input to the drive circuit 8. Note that K is a constant increase rate.

しかしながら、このような従来の電子制御燃料噴射装置
にあっては、高負荷時の増量補正に際し、スロットルス
イッチにより所定開度以上を検出して、このとき一定の
増量率で増量していたため（第２図参照）、スロットル
スイッチのチャタリングにより増量を断続的に行なうこ
とがあり、これが機関性能を不安定にする要因となって
いた他、増量率が一定のため、すべての状況に対処しき
れないという問題点があった。However, in such a conventional electronically controlled fuel injection system, when correcting the increase in amount under high load, the throttle switch detects an opening of more than a predetermined opening and increases the amount at a constant increase rate. (Refer to Figure 2), the throttle switch chattering caused the engine to increase the amount intermittently, which caused engine performance to become unstable, and because the rate of increase was constant, it was not possible to deal with all situations. There was a problem.

本発明はこのような従来の問題点を解決することを目的
としてなされたもので、スロットル弁の開度に応じ連続
的に変化する信号を出力するスロットルセンサを用い、
このセンサがらの信号に基づいて第１所定開度以上で増
量補正を開始し、前記第１所定開度より小さい第２所定
開度以下で増量補正を終了するようにして、増量開始点
と終了点にヒステリシスをもたセ、また増量補正時の増
量率を機関回転数に応じて決定するようにし、以上によ
りチャタリングの防止と状況に応した増量とを図るよう
にしたものである。The present invention was made with the aim of solving such conventional problems, and uses a throttle sensor that outputs a signal that continuously changes depending on the opening degree of the throttle valve.
Based on the signal from this sensor, the increase correction is started at a first predetermined opening degree or more, and is ended at a second predetermined opening degree or less, which is smaller than the first predetermined opening degree. In addition, the increase rate at the time of the increase correction is determined according to the engine speed, thereby preventing chattering and increasing the amount according to the situation.

以下、本発明を第３図に示ず一実施例に基づいて説明す
る。The present invention will be described below based on an embodiment not shown in FIG.

機関の点火コイル２がら得られる点火信号ｓ１と、吸入
空気量検出器４がらｉηられる吸入空気量信号Ｓ２とが
、コンＩ−ロールユニット５の燃料噴射量演算回路６に
入力され、演算回路６で演算された燃料噴射量信号（基
本パルス信号）３３が増量補正回路】２を介して燃料噴
射弁駆動回路８に送られる。The ignition signal s1 obtained from the ignition coil 2 of the engine and the intake air amount signal S2 obtained from the intake air amount detector 4 are input to the fuel injection amount calculation circuit 6 of the control I-roll unit 5. The fuel injection amount signal (basic pulse signal) 33 calculated in is sent to the fuel injection valve drive circuit 8 via the increase correction circuit 2.

ここで、増量補正回路１２の非作動時には、演算回路６
で演算された燃料噴射量信号ｓ３がそのまま駆動回路８
に入力され、駆動回路８は入力される燃料噴射量信号Ｓ
３に基づいて燃料噴射弁９を駆動するための駆動パルス
信号Ｓ４を形成し、燃料噴射弁９に出力する。以上は従
来と同しである。Here, when the increase correction circuit 12 is not operating, the calculation circuit 6
The fuel injection amount signal s3 calculated in is directly sent to the drive circuit 8.
The drive circuit 8 receives the input fuel injection amount signal S
3, a drive pulse signal S4 for driving the fuel injection valve 9 is formed and output to the fuel injection valve 9. The above is the same as before.

増量補正回路１２はスロットルセンサ１３からの信号に
基づいて増量補正の要否を判定する判定回路１４を含ん
で構成され、判定回路１４の出力が■ルヘルのとき作動
するようになっている。The increase correction circuit 12 includes a determination circuit 14 that determines whether or not an increase correction is necessary based on the signal from the throttle sensor 13, and is activated when the output of the determination circuit 14 is 1.

スロットルセンサ１３はポテンショメータ式で、スロッ
トル弁の開度に応じ連続的に増大する電圧信号■を出力
するものであり、その電圧信号■ば判定回路１４の第１
比較回路１５及び第２比較回路１６にそれぞれ入力され
る。The throttle sensor 13 is of a potentiometer type and outputs a voltage signal that continuously increases depending on the opening degree of the throttle valve.
The signals are input to a comparison circuit 15 and a second comparison circuit 16, respectively.

判定回路Ｉ４の第１比較回路１５は基準電圧信号Ｖ１と
の比較によりスロットル開度が第１所定開度α１以上相
当のときＨレベルの信号を発するようになっている。ま
た、第２比較回路１６は基準電圧信号Ｖ２（＜Ｖｌ）と
の比較によりスロットル開度が前記第１所定開度α１よ
り小さい第２所定開度α２（第４図参照）以下相当のと
きＨレベルの信号を発するようになっている。The first comparator circuit 15 of the determination circuit I4 is configured to generate an H level signal when the throttle opening corresponds to a first predetermined opening α1 or more by comparison with the reference voltage signal V1. Further, the second comparison circuit 16 detects when the throttle opening is equal to or less than a second predetermined opening α2 (see FIG. 4) which is smaller than the first predetermined opening α1 by comparison with the reference voltage signal V2 (<Vl). It is designed to emit a level signal.

そして、判定回路１４内では第１比較回路１５の出力端
子がフリップフロップ回路１７のセント端子につながれ
、第２比較回路１６の出力端子がフリップフロップ回路
１７のリセット端子につながれており、このフリップフ
ロップ回路１７の出力が■（レベルのとき増量補正回路
１２が作動するよ・うになっている。In the determination circuit 14, the output terminal of the first comparison circuit 15 is connected to the cent terminal of the flip-flop circuit 17, and the output terminal of the second comparison circuit 16 is connected to the reset terminal of the flip-flop circuit 17. When the output of the circuit 17 is at the (■) level, the increase correction circuit 12 is activated.

また、増量補正回路１２には点火コイル２がらの点火信
号Ｓ１が入力され、これに基づいて増量率を機関回転数
に応じ第５図に示す如く決定するようになっている。Further, the ignition signal S1 from the ignition coil 2 is input to the fuel increase correction circuit 12, and based on this, the fuel increase rate is determined in accordance with the engine speed as shown in FIG.

かくして、スロットル開度が第２所定開度α２以下の領
域では、第１比較回路１５の出力がＬレベルで、第２比
較回路１６の出力がＨレベルテアリ、フリップフロップ
回路１７のリセット端子にのみＨレベルの信号が入力さ
れている。このため、フリップフロップ回路１７の出力
はＬレベルに保持され、増量補正回路１２は作動せず、
増量補正は行なわれない。Thus, in the region where the throttle opening is less than or equal to the second predetermined opening α2, the output of the first comparison circuit 15 is at the L level, the output of the second comparison circuit 16 is at the H level, and only the reset terminal of the flip-flop circuit 17 is at the H level. A level signal is being input. Therefore, the output of the flip-flop circuit 17 is held at L level, and the increase correction circuit 12 does not operate.
No increase correction is performed.

次に、この状態からスロットル開度が第２所定開度α２
を越えて、第２比較回路１６の出力がＬレベルとなって
も、第１の所定開度α１未満であれば、第１比較回路１
５の出力は１７レベルのままであるので、フリップフロ
ップ回路１７の出力はＩ７７レベル保たれる。このため
、第２所定開度α２を越えても第１所定開度α１未満で
は増量補正は行なわれない。Next, from this state, the throttle opening is changed to a second predetermined opening α2.
Even if the output of the second comparison circuit 16 exceeds the L level, if it is less than the first predetermined opening α1, the first comparison circuit 1
Since the output of the flip-flop circuit 17 remains at the 17 level, the output of the flip-flop circuit 17 remains at the I77 level. Therefore, even if the second predetermined opening degree α2 is exceeded, the increase correction is not performed when the opening degree is less than the first predetermined opening α1.

そして、スロットル開度が第１所定開度α１以」二とな
ると初めて、第１比較回路１５の出力が■（レベルに反
転することにより、フリップフロップ回路１７のセット
端子に■ルヘルの信号が入力され、フリップフロップ回
路］７の出力がＨレベルに切換わる。これにより、増量
補正回路１２が作動し、増量補正が行なわれるようにな
る。従って、増量開始点ばα１である。Then, only when the throttle opening becomes equal to or larger than the first predetermined opening α1'2, the output of the first comparator circuit 15 is inverted to the ■(level), and a ■ Luher signal is input to the set terminal of the flip-flop circuit 17. Then, the output of the flip-flop circuit] 7 is switched to H level.As a result, the increase correction circuit 12 is activated and the increase correction is performed.Therefore, the increase starting point is α1.

増量補正に際し、増量補正回路１２は演算回路６で演算
された燃料噴射量信号Ｓ３を、そのパルス幅Ｐ１１に対
し、（１＋Ｋ）　　・Ｐｗのパルス幅をもつ信号Ｓ５に
変換して出力するが、ここで増量率には、点火コイル２
からの信号に基づき、第５図に示す如く機関回転数に対
応して予め定めた値を検索して用いることにより、機関
回転数に応して変化させる。During the increase correction, the increase correction circuit 12 converts the fuel injection amount signal S3 calculated by the calculation circuit 6 into a signal S5 having a pulse width of (1+K) Pw with respect to its pulse width P11, and outputs the signal S5. Here, the increase rate includes ignition coil 2
Based on the signal from the engine, a predetermined value corresponding to the engine speed is retrieved and used as shown in FIG. 5, thereby changing the value in accordance with the engine speed.

次にこの状態からスロットル開度が第１所定開度α１よ
り小さくなり、第１の比較回路１５の出力力月、レベル
となっても、第２所定開度α２を越えていれば、第２比
較回路１６の出力はＬレベルのままであるので、フリッ
プフロップ回路１７の出力は１ルベルに保たれる。この
ため、第１所定開度αＩより小さくなっても、第２所定
開度α２を越えていれば、増量補正が行なわれる。Next, from this state, even if the throttle opening becomes smaller than the first predetermined opening α1 and reaches the output power level of the first comparison circuit 15, if it exceeds the second predetermined opening α2, the second Since the output of the comparison circuit 16 remains at the L level, the output of the flip-flop circuit 17 is maintained at 1 level. Therefore, even if the opening degree becomes smaller than the first predetermined opening degree αI, if it exceeds the second predetermined opening degree α2, an increase correction is performed.

そして、スロットル開度が第２所定開度α２以下となる
と始めて、第２比較回路】６の出力がト■レベルに反転
することにより、フリップフロップ回路Ｉ７のリセソ１
一端子にＨレベルの信号が入力され、フリップフロップ
回路１７の出力がＬレベルに切換わる。これにより、増
量補正回路１２は非作動となり、増量補正が行なわれな
くなる。従って、増量終了点はα２であり、第４図に示
す如くヒステリシスを持った特性となる。Then, only when the throttle opening becomes equal to or less than the second predetermined opening α2, the output of the second comparator circuit 6 is inverted to the high level.
An H level signal is input to one terminal, and the output of the flip-flop circuit 17 is switched to L level. As a result, the increase correction circuit 12 becomes inactive, and no increase correction is performed. Therefore, the increase end point is α2, and the characteristic has hysteresis as shown in FIG.

以上説明したように本発明は、スロットル弁の開度に応
じ連続的に変化する信号を出力するスロ・ノトルセンサ
を用いて増量域を判定し、増量開始点と終了点とにヒス
テリシスを持たせ、しかも増量率を回転数に依存して決
定するようにしたため、チャタリングの防止と、状況に
応じた増量を行なうことができるという効果が得られる
。As explained above, the present invention determines the fuel increase range using a throttle/nottle sensor that outputs a signal that continuously changes depending on the opening degree of the throttle valve, and provides hysteresis at the fuel increase start point and end point. Moreover, since the increase rate is determined depending on the rotational speed, it is possible to prevent chattering and increase the amount according to the situation.

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

第１図は電子制御燃料噴射装置への従来例を示す概略図
、第２図は従来例におけるスロットル開度と増量率との
関係を示す線図、第３図は本発明による電子制御燃料噴
射装置の一実施例を示すブロック図、第４図は同上一実
施例におけるスロットル開度と増量率との関係を示す線
図、第５図は機関回転数と増量率との関係を示す線図で
ある。 ２・・・点火コイル　　４・・・吸入空気量検出器６・
・・演算回路　　８・・・駆動回路　　９・・・燃料噴
射弁　　１０・・・スロットル弁　　１２・・・増量補
正回路１３・・・スロットルセンザ　　１４・・・判定
回路１５・・・第１比較回路　　１６・・・第２比較回
路１７・・・フリップフロップ回路 特許出願人　　日本電子機器株式会社 代理人　　　弁理士　笹　島　冨二雄 （９） １５５ →く 伊−→ ′　ゼ四−舶Fig. 1 is a schematic diagram showing a conventional example of an electronically controlled fuel injection device, Fig. 2 is a diagram showing the relationship between throttle opening and fuel increase rate in the conventional example, and Fig. 3 is an electronically controlled fuel injection according to the present invention. A block diagram showing one embodiment of the device, FIG. 4 is a diagram showing the relationship between the throttle opening and the increase rate in the same embodiment, and FIG. 5 is a diagram showing the relationship between the engine speed and the increase rate. It is. 2... Ignition coil 4... Intake air amount detector 6.
... Arithmetic circuit 8 ... Drive circuit 9 ... Fuel injection valve 10 ... Throttle valve 12 ... Increase correction circuit 13 ... Throttle sensor 14 ... Judgment circuit 15 ... First comparison Circuit 16...Second comparison circuit 17...Flip-flop circuit Patent applicant Japan Electronics Co., Ltd. Agent Patent attorney Fujio Sasashima (9) 155 →Kui-→' Ze4-ship

Claims (1)

【特許請求の範囲】[Claims] 機関の吸入空気量に応じて燃料噴射量を定め、高負荷時
には当該燃料噴射量を増量補正するようにした内燃機関
の電子制御燃料噴射装置において、スロットル弁の開度
に応じ連続的に変化する信号を出力するスロットルセン
サを設けると共に、このセンサからの信号に基づいて第
１所定開度以上で増量補正を開始し、前記第１所定開度
より小さい第２所定開度以下で増量補正を終了し、且つ
増量補正時の増量率を機関回転数に応じて決定する増量
補正回路を設けたことを特徴とする内燃機関の電子制御
燃料噴射装置。In an electronically controlled fuel injection system for an internal combustion engine, the fuel injection amount is determined according to the intake air amount of the engine, and the fuel injection amount is increased during high loads. A throttle sensor that outputs a signal is provided, and based on the signal from this sensor, the increase correction is started at a first predetermined opening degree or more, and the increase correction is ended at a second predetermined opening degree or less, which is smaller than the first predetermined opening degree. What is claimed is: 1. An electronically controlled fuel injection system for an internal combustion engine, further comprising an increase correction circuit that determines a rate of increase during the increase correction according to the engine speed.
JP9756382A 1982-06-09 1982-06-09 Electronically controlled fuel injection device Pending JPS58214630A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9756382A JPS58214630A (en) 1982-06-09 1982-06-09 Electronically controlled fuel injection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9756382A JPS58214630A (en) 1982-06-09 1982-06-09 Electronically controlled fuel injection device

Publications (1)

Publication Number Publication Date
JPS58214630A true JPS58214630A (en) 1983-12-13

Family

ID=14195695

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9756382A Pending JPS58214630A (en) 1982-06-09 1982-06-09 Electronically controlled fuel injection device

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JP (1) JPS58214630A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5453718A (en) * 1977-10-07 1979-04-27 Nissan Motor Co Ltd Internal combustion engine fuel supply system
JPS551412A (en) * 1978-06-19 1980-01-08 Toyota Motor Corp Compensating concentration of mixture in internal combustion engine
JPS5557635A (en) * 1978-10-20 1980-04-28 Nissan Motor Co Ltd Fuel injection system
JPS55137323A (en) * 1979-04-13 1980-10-27 Nippon Denso Co Ltd Electronic controlled fuel injection device
JPS5618036A (en) * 1979-07-19 1981-02-20 Nissan Motor Co Ltd Fuel controller

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5453718A (en) * 1977-10-07 1979-04-27 Nissan Motor Co Ltd Internal combustion engine fuel supply system
JPS551412A (en) * 1978-06-19 1980-01-08 Toyota Motor Corp Compensating concentration of mixture in internal combustion engine
JPS5557635A (en) * 1978-10-20 1980-04-28 Nissan Motor Co Ltd Fuel injection system
JPS55137323A (en) * 1979-04-13 1980-10-27 Nippon Denso Co Ltd Electronic controlled fuel injection device
JPS5618036A (en) * 1979-07-19 1981-02-20 Nissan Motor Co Ltd Fuel controller

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