JPS5827824A - Fuel supplier of internal combustion engine - Google Patents
Fuel supplier of internal combustion engineInfo
- Publication number
- JPS5827824A JPS5827824A JP12646281A JP12646281A JPS5827824A JP S5827824 A JPS5827824 A JP S5827824A JP 12646281 A JP12646281 A JP 12646281A JP 12646281 A JP12646281 A JP 12646281A JP S5827824 A JPS5827824 A JP S5827824A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- air
- venturi
- sectional area
- pressure
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (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
Description
【発明の詳細な説明】
この発明は、内燃機関の燃料供給装置に関するもので、
特に内燃機関の出力制御用として使われているスロット
ルバルブを流体力学的に損失の少ない例えばベンチュリ
ー構造とし、このベンチュリ一部分での圧力と吸気管通
路断面積をパラメータとして空燃比制御された燃料供給
を行なう燃料供給装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel supply device for an internal combustion engine.
In particular, the throttle valve, which is used to control the output of internal combustion engines, has a fluid-dynamically low loss structure such as a venturi structure, and the air-fuel ratio is controlled using the pressure in the venturi section and the cross-sectional area of the intake pipe passage as parameters. The present invention relates to a fuel supply device.
従来、内燃機関の燃料供給装置として気化器式あるいは
燃料噴射式のものがあり、特に後者は近年急速に発展し
てきたマイクロコンピュータ郷の電力装置を利用し、複
雑で精密な燃料制御が行なわれるようになってきている
。とシわけ排気ガス規制や省燃費の観点から各種の運転
条件に合わせてＥＧＲ（排気ガス循ＩＩ）や空燃比制御
を複雑かつ精確、迅速に行なうことが要精されるようＫ
なってからは、機械的な工作精度や経年変化等の問題か
ら気化器式のものでは制御が非常に困難なため、最近で
は電子式の燃料供給制御装置の実用拡大化が進みつつあ
る。そこで現在実用化されている電子式の燃料供給シス
テムでは、基本的な構成要素として入力部に空気流量メ
ータ、出力部に電気的に制御される燃料噴射装置を備え
、この入出力部間を制御する部分をマイクロコンピュー
タ勢を含む電子回路で構成するという方法がとられての
特長であるが、実用化されている電子式燃料供給システ
ムの構成からも解るように１制御部となる電子回路への
入力が全体の動作を精確さ迅速さに対応したものである
必要があシ、実際にはかなシ複雑で高精度、高価な空気
流量メータ、あるいはこれを補足するものとして、いく
つかの他の入力パラメータ全域り込んで制御している。Conventionally, fuel supply systems for internal combustion engines have been of the carburetor type or the fuel injection type, and the latter in particular utilizes the power equipment of microcomputers, which have developed rapidly in recent years, to perform complex and precise fuel control. It is becoming. In particular, from the perspective of exhaust gas regulations and fuel efficiency, it is becoming increasingly important to perform EGR (exhaust gas circulation II) and air-fuel ratio control in a complex, precise, and quick manner in accordance with various operating conditions.
Since then, control with a carburetor type has been extremely difficult due to problems such as mechanical precision and aging, so electronic fuel supply control devices have recently been increasingly put into practical use. Therefore, the electronic fuel supply system that is currently in practical use has an air flow meter at the input section and an electrically controlled fuel injection device at the output section as basic components, and controls the flow between the input and output sections. One of the features of this method is that the control part is configured with an electronic circuit including a microcomputer, but as can be seen from the configuration of the electronic fuel supply system that has been put into practical use, the electronic circuit that serves as one control unit is The input of the entire operation must correspond to the accuracy and speed, but in practice it may be difficult to use a complex, high precision, expensive air flow meter, or as a complement to this, some other The entire range of input parameters is carefully controlled.
特に車載の内燃機関の場合、運転者の意志によって任意
の条件下で行なわれる加減動作に対する迅速さの要求に
対してはスロットルバルブの開口度を検出する等の新た
な入力要素を付加して加減速補正を行なっているのが現
状である。Particularly in the case of in-vehicle internal combustion engines, in order to meet the demand for quick adjustment and reduction operations performed under arbitrary conditions according to the driver's will, new input elements such as detecting the opening degree of the throttle valve are added. Currently, deceleration correction is being performed.
この発明社上記のような従来の欠点を除去するためにな
されたもので、従来機関の出力制御用としてのみ使われ
ていた吸気管内のスロットルバルブｔ−流体力学的に損
失が少なく、その吸気管通路を通過する流量と圧力との
関係が決定されるような構造、例えば通路断面積が可変
のベンチュＩＪ−とし、このベンチュリー負圧を圧力セ
ンサーで検出し、圧力と通路断面積をパラメータとして
各時点における空気流量に応じた燃料を供給する空燃比
制御可能な燃料供給手段から構成される機関の出力制御
と燃料供給制御とを兼ね備えた内燃機関の燃料供給装置
を提供することを目的としている。This invention was made in order to eliminate the above-mentioned drawbacks of the conventional throttle valve in the intake pipe, which was conventionally used only for controlling the output of the engine. A structure in which the relationship between the flow rate and pressure passing through a passage is determined, for example, a venturi IJ with a variable passage cross-sectional area, and this venturi negative pressure is detected by a pressure sensor, and each pressure and passage cross-sectional area are used as parameters. It is an object of the present invention to provide a fuel supply device for an internal combustion engine that combines engine output control and fuel supply control, which is comprised of a fuel supply means capable of controlling the air-fuel ratio and supplies fuel according to the air flow rate at a time.
以下この発明の一実施例を図について説明する。An embodiment of the present invention will be described below with reference to the drawings.
図において、１は外気中の異愉を除去して外気を吸気管
へ導くエアークリーナ、２は吸気管、３はアクセル、４
はこのアクセルと連動して吸入空気量を制限するため、
空気流の通路断面積ＡＴｔ−変化させる可変ベンチュＩ
Ｊ−１５は通路断面積ＡＴに応じた電気信号を出力する
トランスデユーサ−１６はベンチュリー４の負圧発生部
位の圧力ＰＴを検出する圧力センサー、７は燃料インジ
ェクター、８はこのインジェクター７から吐出される燃
料量の計量制御部、９は上記通路断面積ＡＴと負圧発生
部位の圧力ｐＴとを入力パラメータとする関数発生器、
１０は吸気管２内の圧力を検出する圧力センサー、１１
は機関、１２は燃料供給部である。In the figure, 1 is an air cleaner that removes foreign matter in the outside air and guides the outside air to the intake pipe, 2 is the intake pipe, 3 is the accelerator, and 4 is the air cleaner.
works in conjunction with this accelerator to limit the amount of intake air,
Air flow passage cross-sectional area ATt - Variable vent I to change
J-15 is a pressure sensor that outputs an electric signal according to the passage cross-sectional area AT. A transducer 16 is a pressure sensor that detects the pressure PT of the negative pressure generation part of the venturi 4. 7 is a fuel injector. 8 is a fuel discharged from this injector 7. 9 is a function generator whose input parameters are the passage cross-sectional area AT and the pressure pT of the negative pressure generating part;
10 is a pressure sensor that detects the pressure inside the intake pipe 2; 11;
12 is an engine, and 12 is a fuel supply section.
次に動作について説明する。エアークリーナ１゜吸気管
２ｔ−通って吸入される空気流は、アクセルイダル３に
連動し念ベンチュリー４の部分で流量制限されると共に
、その流速が加速される。つまり流体力学によって圧力
が低下する。ここでベンチュリー４の付近における吸入
空気流について断熱状態の層流を仮定すると、空気流量
Ｇは近似的に
と表わされる。ここでＰｌ、γ１はそれぞれベンチュリ
ー４の上流側の吸気管２の圧力、および空気密度、には
空気の比熱比でに＝１．４．ＡＴはベンチュリー４の通
路断面積、ＰＴはベンチュリーの圧力である。上式は吸
気管２内の空気流速がベンチュリー４での流速に比べて
かなり小さい場合、非常に精度よく近似されるものであ
る。一般的な内燃機関でのスロットルバルブの絞）部分
の空気流速は、亜音速領域に達して乱流状態となるが、
上記の近似値は十分な精度を有している。また関数発生
器＝１４１割った値をＡＴおよびＰＴ／Ｐ、の入力に対
しで発生し、その出力を燃料量の計量制御部８に送る。Next, the operation will be explained. The air flow sucked through the air cleaner 1° and the intake pipe 2t is interlocked with the accelerator 3, and its flow rate is restricted at the venturi 4, and its flow velocity is accelerated. In other words, the pressure decreases due to fluid dynamics. Here, assuming that the intake air flow in the vicinity of the venturi 4 is an adiabatic laminar flow, the air flow rate G can be approximately expressed as follows. Here, Pl and γ1 are the pressure of the intake pipe 2 on the upstream side of the venturi 4, the air density, and the specific heat ratio of air, respectively, which is 1.4. AT is the passage cross-sectional area of the venturi 4, and PT is the pressure of the venturi. The above equation can be approximated very accurately when the air flow velocity in the intake pipe 2 is considerably smaller than the flow velocity in the venturi 4. In a typical internal combustion engine, the air flow velocity at the throttle valve part reaches the subsonic region and becomes turbulent.
The above approximations have sufficient accuracy. Further, the function generator generates a value divided by 141 for the inputs of AT and PT/P, and sends the output to the fuel quantity metering control section 8.
この制御部８は上記の出力に比例した周波数で往復駆動
される燃料？ンプ等で構成される公知のものである。This control unit 8 is fuel driven reciprocally at a frequency proportional to the above output. This is a well-known device consisting of a pump, etc.
以上のようにこの発明によれば、従来機関の出力制御用
として吸入空気量の制御手段であるスロットルバルブを
ベンチュリー構造とし、こノヘンチュリーの負圧とその
通路断面積をパラメータとして空燃比制御するようにし
たので、運転者の意志によシ外部から機関の運転状態を
変更するための唯一の手段であるスロットルの動きに対
して直接的に燃料供給量が変化でき、したがって過渡応
答性に優れた燃料供給制御が行なえる効果がある。As described above, according to the present invention, the throttle valve, which is a means for controlling the amount of intake air for controlling the output of a conventional engine, has a venturi structure, and the air-fuel ratio is controlled using the negative pressure of the venturi and its passage cross-sectional area as parameters. As a result, the fuel supply amount can be changed directly in response to the throttle movement, which is the only means for changing the engine operating state from outside according to the driver's will, and therefore has excellent transient response. This has the effect of enabling fuel supply control.
また、入力パラメータが圧力と通路断面積の２つのみで
あるので制御のための演算が単純でかつ装置全体が簡単
化できる等の効果がある。Furthermore, since there are only two input parameters, pressure and passage cross-sectional area, calculations for control are simple and the entire device can be simplified.
図面はこの発明の一実施例を示す燃料供給装置のｉｔｔ
要図である。
１・・・エアークリーナ、２・・・吸気管、３゛′°ア
クセルペダル、４・・・ペンデユ！Ｊ−１５・・・トラ
ンスデユー？−，６，１０・・・圧力センサー、７・・
・インジェクター、８・・・計量制御部、９・・・関数
発生器〇代理人 葛 野 信 −The drawing shows a fuel supply device showing one embodiment of the present invention.
This is the essential diagram. 1... Air cleaner, 2... Intake pipe, 3゛'° accelerator pedal, 4... Penduyu! J-15...transduyu? -, 6, 10...pressure sensor, 7...
・Injector, 8...Metric control unit, 9...Function generator〇Representative Shin Kuzuno -
Claims (1)
化するペンチエリ−と、このベンチュリーの負圧発生部
位の圧力ＰＴおよびベンチュリーの上流部の吸気管内圧
力Ｐｔ’ｆｒ検出する圧力センサーと、上記通路断面積
ＡＴおよび負圧発生部の圧力ＰＴ／吸気管内圧力Ｐｘｋ
入力ＡＩラメータとする関数発生器と、この関数発生器
の出力に応じて吐出される燃料量が変化する燃料吐出手
段とを備えたことを特徴とする内燃機関の燃料供給装置
。A pressure sensor that detects the pressure PT at the negative pressure generating part of the venturi and the pressure Pt'fr in the intake pipe upstream of the venturi, and the passageway. Cross-sectional area AT and pressure PT of negative pressure generating section/intake pipe pressure Pxk
1. A fuel supply device for an internal combustion engine, comprising: a function generator that uses an input AI parameter; and a fuel discharge means that changes the amount of fuel discharged according to the output of the function generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12646281A JPS5827824A (en) | 1981-08-12 | 1981-08-12 | Fuel supplier of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12646281A JPS5827824A (en) | 1981-08-12 | 1981-08-12 | Fuel supplier of internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5827824A true JPS5827824A (en) | 1983-02-18 |
Family
ID=14935808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12646281A Pending JPS5827824A (en) | 1981-08-12 | 1981-08-12 | Fuel supplier of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5827824A (en) |
-
1981
- 1981-08-12 JP JP12646281A patent/JPS5827824A/en active Pending
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