JPS5833374B2 - Fuel injection engine supercharging device - Google Patents
Fuel injection engine supercharging deviceInfo
- Publication number
- JPS5833374B2 JPS5833374B2 JP9408279A JP9408279A JPS5833374B2 JP S5833374 B2 JPS5833374 B2 JP S5833374B2 JP 9408279 A JP9408279 A JP 9408279A JP 9408279 A JP9408279 A JP 9408279A JP S5833374 B2 JPS5833374 B2 JP S5833374B2
- Authority
- JP
- Japan
- Prior art keywords
- passage
- supercharging
- supercharger
- air
- engine
- 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
Links
Landscapes
- Exhaust Gas After Treatment (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Supercharger (AREA)
Description
【発明の詳細な説明】
本発明は、吸気通路に空気量検出装置を設け、吸入空気
量に応じて燃量噴射量を設定するようにした燃料噴射式
エンジンに好適な過給装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a supercharging device suitable for a fuel injection type engine, which is equipped with an air amount detection device in an intake passage and sets a fuel injection amount according to the amount of intake air.
従来より、主吸気通路に加えて過給通路を設け、自然吸
入による主吸気通路からの主吸気に加えて、エンジンに
よって駆動される過給機により加圧されたエアまたは混
合気を過給気として過給通路からエンジンの燃焼室に補
助的に充填（過給）し、エンジンの充填効率をアップし
、エンジン出力の向上を図るようにしたエンジンの過給
装置は公知である（例えば特開昭５３−２４９１３号公
報参照）。Conventionally, a supercharging passage has been provided in addition to the main intake passage, and in addition to the main intake from the main intake passage due to natural intake, air or air mixture pressurized by a supercharger driven by the engine is used for supercharging. Engine supercharging devices that supplementally charge (supercharge) the combustion chamber of the engine from the supercharging passage to increase engine charging efficiency and improve engine output are known (for example, in Japanese Patent Application Laid-Open No. (See Publication No. 53-24913).
ところで、この種の過給装置を燃料噴射式エンジンに適
用する場合には、過給通路からエンジンの燃焼室に供給
される過給量自体も燃量噴射量の設定にとって重要であ
るため、過給量を正確に計量する必要があり、そのため
には、エアフローメータ等の空気量検出装置を介設した
吸気通路を該空気量検出装置の下流で主吸気通路と過給
機を介設した過給通路とに分岐し、一つの空気量検出装
置によってエンジンの燃焼室に供給される吸入空気の総
量、を検出することが有利である。By the way, when applying this type of supercharging device to a fuel injection engine, the amount of supercharging itself supplied from the supercharging passage to the combustion chamber of the engine is important for setting the fuel injection amount. It is necessary to accurately measure the intake amount, and for this purpose, the intake passage with an air quantity detection device such as an air flow meter is connected to the main intake passage downstream of the air quantity detection device, and the supercharger is arranged in the intake passage downstream of the air quantity detection device. It is advantageous to detect the total amount of intake air supplied to the combustion chamber of the engine by means of one air quantity detection device.
しかしながら、過給機によって供給される過給気は、エ
ンジンの全運転範囲に亘ってその全量がエンジンの作動
室に供給されるとは限られず、例えば出力性能よりも排
気ガス浄化性能が問題となるエンジンの低負荷運転時に
は、排気ガス浄化用の２次エアとして過給気の一部を過
給機下流の過給通路より分岐させて設けた２次エア供給
通路からエンジンの排気通路に供給することが有利であ
ると考えられている。However, the entire amount of supercharged air supplied by a supercharger is not necessarily supplied to the engine working chamber over the entire operating range of the engine, and for example, exhaust gas purification performance is more important than output performance. During low-load operation of the engine, part of the supercharged air is supplied to the engine exhaust passage as secondary air for purifying exhaust gas from a secondary air supply passage that is branched from the supercharging passage downstream of the turbocharger. It is considered advantageous to do so.
したがって、エンジンの運転条件によっては、上記吸気
通路に介設した空気量検出装置によって検出した吸入空
気の全量がエンジンの燃焼室に供給されるものではなく
、通常の如く、上記空気量検出装置によって検出した空
気量に応じて、燃料噴射量を設定した場合には、燃料が
過剰となる問題がある。Therefore, depending on the operating conditions of the engine, the entire amount of intake air detected by the air amount detection device installed in the intake passage may not be supplied to the combustion chamber of the engine. When the fuel injection amount is set according to the detected air amount, there is a problem that fuel becomes excessive.
この問題を解消するためには、過給通路からさらに２次
エア供給通路に分流される２次エア量を、上記とは別の
エアフローメーク等の空気量検出装置によって検力し、
その検出値を吸気通路に介設した空気量検出装置の検出
値から減算し、その計算結果に応じて燃料噴射量を設定
することが考えられるが、この方式は、空気量検出装置
を余計に設けなければならないうえ、燃料噴射装置側の
制御をいたずらに複雑化する問題がある。In order to solve this problem, the amount of secondary air that is further branched from the supercharging passage to the secondary air supply passage is detected by an air amount detection device such as an air flow make, which is different from the one described above.
It is conceivable to subtract this detected value from the detected value of an air amount detection device installed in the intake passage and set the fuel injection amount according to the calculation result, but this method requires an unnecessary air amount detection device. In addition, there is a problem in that it unnecessarily complicates the control on the fuel injection device side.
本発明は、かかる問題を解消すべくなされたものであっ
て、単一の空気量検出装置を用いたうえで、２次エアと
して消費される２次エア供給量分は、その量に応じて空
気量検出装置をバイパスさせて別途過給通路を含む吸気
通路に供給することにより、空気量検出装置は、エンジ
ンの燃焼室内に実際に供給される吸入空気の総量を常時
正確に検出することができ、よって過給装置を採用する
場合にも、燃料噴射制御系には何んらの変更をもたらす
ことなしに、正確な燃料制御が行える燃料噴射式エンジ
ンの過給装置を提供することを目的としている。The present invention was made to solve this problem, and by using a single air amount detection device, the amount of secondary air supplied that is consumed as secondary air is adjusted according to the amount. By bypassing the air amount detection device and supplying it to the intake passage including the supercharging passage separately, the air amount detection device can accurately detect the total amount of intake air actually supplied into the combustion chamber of the engine at all times. The present invention aims to provide a supercharging device for a fuel-injected engine that allows accurate fuel control without making any changes to the fuel injection control system even when a supercharging device is adopted. It is said that
このため、本発明においては、吸気通路上流に設置した
空気量検出装置の下流において主吸気通路と過給通路と
を分岐させ、過給通路の途中には過給機を介設し、過給
通路の過給機の下流には、第１分岐部を介して、２次エ
ア供給通路を分岐させて設ける一方、過給通路の過給機
上流には、第２分岐部を介して他端が大気に開放された
大気導入通路を分岐させ、上記第１分岐部にはエンジン
の運転状態に応じて該第１分岐部下流の過給通路と２次
エア供給通路とを過給機に対して交互に切換接続する第
１切換弁を設ける一方、第２分岐部には、第１切換弁が
上記第１分岐部下流の過給通路を過給機に対して接続し
たときには、上記第２分岐部上流の過給通路を過給機に
対して接続するとともに、第１切換弁が上記２次エア供
給通路を過給機に対して接続したときには、上記大気導
入通路を過給機に対して接続する第２切換弁を設けるこ
とによって、過給時には、空気量検出装置によって計量
した吸気の一部を過給機により加圧してエンジンの燃焼
室に供給するようにする一方、２次エア供給時には、空
気量検出装置とは無関係に外気を取入れてこれを過給機
により加圧して２次エアとしてエンジンの排気系に供給
するようにしたことを基本的な特徴としている。Therefore, in the present invention, the main intake passage and the supercharging passage are branched downstream of the air amount detection device installed upstream of the intake passage, and a supercharger is interposed in the middle of the supercharging passage. A secondary air supply passage is provided downstream of the supercharger in the passage through a first branch part, while a secondary air supply passage is provided at the other end of the passage upstream of the supercharger through a second branch part. The first branch is connected to a supercharging passage downstream of the first branch and a secondary air supply passage to the supercharger depending on the engine operating condition. A first switching valve is provided at the second branch, and when the first switching valve connects the supercharging passage downstream of the first branch to the supercharger, the second switching valve is connected to the supercharging passage downstream of the first branch. When the supercharging passage upstream of the branch part is connected to the turbocharger, and the first switching valve connects the secondary air supply passage to the turbocharger, the atmosphere introduction passage is connected to the turbocharger. By providing a second switching valve that is connected to At the time of supply, the basic feature is that outside air is taken in regardless of the air amount detection device, pressurized by a supercharger, and supplied as secondary air to the exhaust system of the engine.
即ち、本発明に係る燃料噴射式エンジンの過給装置にお
いては、単一の空気量検出装置を設けて、主吸気と過給
気の総量を正確に検出することができるようにし、２次
エアの供給時には、過給機上流の過給通路を上記空気量
検出装置を介設した吸気通路からカットして、過給機の
吸込側を大気に連通ずることにより、上記空気量検出装
置では２次エア分を計算しないようにしたうえで、過給
機を２次エア供給のための２次エアポンプとして利用す
るようにしたことを特徴としている。That is, in the supercharging device for a fuel injection engine according to the present invention, a single air amount detection device is provided to accurately detect the total amount of main intake air and supercharging air, and the secondary air When supplying air, the supercharging passage upstream of the turbocharger is cut from the intake passage in which the air amount detection device is installed, and the suction side of the supercharger is communicated with the atmosphere. This system is characterized in that the supercharger is used as a secondary air pump for supplying secondary air without calculating the amount of secondary air.
以下、図示の実施例について、本発明をより具体的に説
明する。Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments.
図において、Ｅはピストン１の往復動でクランク軸２を
回転させるようにしたレシプロエンジン、３は主吸気バ
ルブ４により吸気行程において燃焼室５に対して開かれ
る主吸気ポート、６は過給バルブ７により吸気行程の終
期に燃焼室５に対して開かれる過給ポート、８は排気バ
ルブ９により排気行程にお・いて開かれる排気ポートで
ある。In the figure, E is a reciprocating engine that rotates a crankshaft 2 by the reciprocating motion of a piston 1, 3 is a main intake port opened to a combustion chamber 5 during the intake stroke by a main intake valve 4, and 6 is a supercharging valve. 7 is a supercharging port opened to the combustion chamber 5 at the end of the intake stroke, and 8 is an exhaust port opened by an exhaust valve 9 during the exhaust stroke.
また、１０はエアクリーナ、１１はエアクリーナ１０に
接続した吸気通路、１２は吸気通路１１を通過する吸入
空気の総量を検出するエアフローメータ等よりなる空気
量検出装置、１３は空気量検出装置１２の下流において
上記吸気通路１１に連続する主吸気通路１４に対して分
岐した過給通路で、その途中には、ベーン型エアポンプ
よりなる過給機１５を介設している。Further, 10 is an air cleaner, 11 is an intake passage connected to the air cleaner 10, 12 is an air amount detection device including an air flow meter or the like that detects the total amount of intake air passing through the intake passage 11, and 13 is downstream of the air amount detection device 12. This is a supercharging passage branching off from a main intake passage 14 that is continuous with the intake passage 11, and a supercharger 15 made of a vane type air pump is interposed in the middle of the supercharging passage.
上記主吸気ポート３に連通ずる主吸気通路１４にはエン
ジンＥの負荷に応じて開閉されるスロットルバルブ１６
を介設するとともに、その下流に空気量検出装置１２の
検出信号に応じてコンΔ−タＡにより制御される燃料噴
射装置Ｂを設置し、燃料噴射式のエンジンを構成してい
る。A throttle valve 16 that opens and closes depending on the load of the engine E is provided in the main intake passage 14 that communicates with the main intake port 3.
A fuel injection device B is installed downstream of the fuel injection device B, which is controlled by a controller A in response to a detection signal from an air amount detection device 12, thereby forming a fuel injection type engine.
上記過給通路１３に介設する過給機１５の吐出側、吸込
側には、夫々第１、第２分岐部１７．１８を設け、第１
分岐部１７からは、エンジンＥの排気通路２０の途中、
好ましくは、排気通路２０に介設した排気ガス浄化装置
２１の上流に開口する２次エア供給通路２２を分岐させ
て設ける。First and second branch portions 17.18 are provided on the discharge side and suction side of the supercharger 15 interposed in the supercharging passage 13, respectively.
From the branch part 17, part way through the exhaust passage 20 of the engine E,
Preferably, a secondary air supply passage 22 that opens upstream of the exhaust gas purification device 21 provided in the exhaust passage 20 is provided in a branched manner.
また、第２分岐部１８には、上流を大気、好ましくは工
アクリーナ１０に接続した大気導入通路２３の下流を接
続している。Further, the second branch portion 18 is connected to the atmosphere, preferably downstream of an atmosphere introduction passage 23 whose upstream side is connected to the air cleaner 10 .
上記第１分岐部１７には、過給機１５の吐出側を途中に
エンジン負荷に応じて開度が調整される過給量コントロ
ールバルブ１９を介設した下流側過給通路１３ｄ又は２
次エア供給通路２２のいずれか一方に接続するダイヤフ
ラム作動の第１切換弁２５を設ける一方、第２分岐部１
８には、過給機１５の吸込側を主吸気通路１４から分岐
した上流側過給通路１３ｕ又は大気導入通路２３のいず
れか一方に接続するダイヤフラム作動の第２切換弁２６
を設けている。In the first branch part 17, a downstream supercharging passage 13d or 2 is provided with a supercharging amount control valve 19 whose opening degree is adjusted depending on the engine load on the discharge side of the supercharger 15.
A diaphragm-operated first switching valve 25 connected to either one of the second air supply passages 22 is provided, while the second branch 1
8 includes a diaphragm-operated second switching valve 26 that connects the suction side of the supercharger 15 to either the upstream supercharging passage 13u branched from the main intake passage 14 or the atmosphere introduction passage 23.
has been established.
これら第１、第２切換弁２５．２６は構造が同じで、互
いに同調して作動するように構成されており、口”ｙド
２５ａ、２６ａを介して弁体２５ｂ。These first and second switching valves 25, 26 have the same structure and are configured to operate in synchronization with each other, and are connected to the valve body 25b via the ports 25a, 26a.
２６ｂを支持したダイヤフラム２５ｃ、２６ｃによって
大気室２５ｄ 、２６ｄとは仕切った負圧室２５ｅ 、
２６ｅには、主吸気通路１４のスロットル弁１６下流に
設けた負圧取出口２８に連通する共通の負圧導入通路２
９によって、スロットル弁１６下流の吸気負圧を導入す
るようにしている。A negative pressure chamber 25e is separated from the atmospheric chambers 25d and 26d by diaphragms 25c and 26c supporting the diaphragm 26b.
26e includes a common negative pressure introduction passage 2 that communicates with a negative pressure outlet 28 provided downstream of the throttle valve 16 in the main intake passage 14.
9, intake negative pressure downstream of the throttle valve 16 is introduced.
したがって、第１、第２切換弁２５．２６は主吸気通路
１４のスロットル弁１６下流の吸気負圧の高低に応じて
切換作動され、吸気負圧が高いエンジンＥの低負荷運転
時には、図の状態、即ち第１切換弁２５の下流側過給通
路１３ｄを閉じて２次エア供給通路２２を開き、また第
２切換弁２６は上流側過給通路１３ｕを閉じて大気導入
通路２３を開いた状態に保持され、その結果、大気導入
通路２３と２次エア供給通路２２との間に過給機１５が
接続される。Therefore, the first and second switching valves 25 and 26 are switched depending on the level of the intake negative pressure downstream of the throttle valve 16 in the main intake passage 14, and when the engine E with high intake negative pressure is operated at a low load, as shown in the figure. In other words, the first switching valve 25 closes the downstream supercharging passage 13d and opens the secondary air supply passage 22, and the second switching valve 26 closes the upstream supercharging passage 13u and opens the atmosphere introduction passage 23. As a result, the supercharger 15 is connected between the atmosphere introduction passage 23 and the secondary air supply passage 22.
一方、吸気負圧が低くなるエンジンＥの高負荷運転時に
は、逆に、第１、第２切換弁２５．２６は夫々２次エア
供給通路２２および大気導入通路２３を閉じるように切
換作動され、その結果、上流側過給通路１３ｕは過給機
１５の吸込側に接続されるとともに、過給機１５の吐出
側は下流側過給通路１３ｄに接続される。On the other hand, during high-load operation of the engine E where the intake negative pressure is low, the first and second switching valves 25 and 26 are switched to close the secondary air supply passage 22 and the atmosphere introduction passage 23, respectively. As a result, the upstream supercharging passage 13u is connected to the suction side of the supercharger 15, and the discharge side of the supercharger 15 is connected to the downstream supercharging passage 13d.
なお、図において、３０は２次エアの供給時その流量ヲ
コントロールする２次エアコントロールバルブ、３１は
過給機１５の吐出側と吸込側とを連通し、途中にチェッ
クボールタイプのＩＪ ＩＪ−フ弁３２を介設したＩＪ
ＩＪ−フ通路である。In the figure, 30 is a secondary air control valve that controls the flow rate of secondary air when it is supplied, and 31 is a check ball type IJ- IJ with a flap valve 32
This is the IJ-fu passage.
上記の構成の結果、エンジンＥの低負荷運転時には過給
は行なわれず、過給機１５は２次エアポンプとして機能
し、大気導入通路２３を介してエアを吸込んで加圧し、
加圧エアを、２次エアとして２次エア供給通路２２を介
して排気通路２０の排気ガス浄化装置２１の上流に供給
する。As a result of the above configuration, during low load operation of the engine E, supercharging is not performed, and the supercharger 15 functions as a secondary air pump, sucking air through the atmospheric air introduction passage 23 and pressurizing it.
Pressurized air is supplied as secondary air to the exhaust passage 20 upstream of the exhaust gas purification device 21 via the secondary air supply passage 22.
この場合の２次エア量は、２次エアコントロールバルブ
３０によりコントロールされる。The amount of secondary air in this case is controlled by the secondary air control valve 30.
したがって、この場合、吸気通路１１に介設した空気量
検出装置１２によって計量された吸気の全量は、主吸気
通路１４を流下し、スロットル弁１６の開度に応じて主
吸気ポート３からエンジンＥの燃焼室５に自然吸入され
るため、空気量検出装置１２は検出した吸入空気量を電
気信号としてコンピュータＡに入力し、燃料噴射装置Ｂ
はコンピュータＡの出力信号に応じて吸入空気量に対応
した燃料を正確に計量してこれを主吸気通路１４に噴射
する。Therefore, in this case, the total amount of intake air measured by the air amount detection device 12 provided in the intake passage 11 flows down the main intake passage 14 and flows from the main intake port 3 to the engine E according to the opening degree of the throttle valve 16. Since the intake air is naturally sucked into the combustion chamber 5, the air amount detection device 12 inputs the detected intake air amount to the computer A as an electric signal, and the air amount is input to the computer A.
In accordance with the output signal of the computer A, the fuel corresponding to the amount of intake air is accurately measured and injected into the main intake passage 14.
一方、エンジンＥの高負荷運転時には、吸気負圧の低下
によって、第１、第２切換弁２５ 、２６がともに切換
作動され、上流側過給通路１３ｕは過給機１５の吸込側
に、下流側過給通路１３ｄは過給機１５の吐出側に夫々
接続され、過給機１５は過給機として機能し、加圧エア
を過給気として下流側過給通路１３ａに送給し、コント
ロールバルブ１９によって流量がコントロールされた過
給気は、過給バルブ７によって過給ポート６が開かれた
ときにエンジンＥの燃焼室５に供給される。On the other hand, during high-load operation of the engine E, both the first and second switching valves 25 and 26 are switched due to a decrease in intake negative pressure, and the upstream supercharging passage 13u is connected to the suction side of the supercharger 15, and the downstream The side supercharging passages 13d are respectively connected to the discharge side of the supercharger 15, and the supercharger 15 functions as a supercharger and feeds pressurized air as supercharging air to the downstream supercharging passage 13a for control purposes. The supercharging air whose flow rate is controlled by the valve 19 is supplied to the combustion chamber 5 of the engine E when the supercharging port 6 is opened by the supercharging valve 7.
この場合、過給気として供給される空気は、空気量検出
装置１２によってその量が検出された吸気の一部であり
、エンジンＥの燃焼室５に実際に供給される空気の全量
は、空気量検出装置１２によって正しく検出され、した
がってコンピュータＡは、吸気の全量に見合った燃料量
を演算して制御信号を燃料噴射装置Ｂに印加し、燃料噴
射装置Ｂは必要な燃料を主吸気通路１４に適正量噴射す
る。In this case, the air supplied as supercharging air is a part of the intake air whose amount is detected by the air amount detection device 12, and the total amount of air actually supplied to the combustion chamber 5 of the engine E is The amount of fuel is correctly detected by the amount detection device 12, and therefore the computer A calculates the amount of fuel corresponding to the total amount of intake air and applies a control signal to the fuel injection device B, so that the fuel injection device B injects the necessary fuel into the main intake passage 14. Inject the appropriate amount.
なお、上記実施例においては第１、第２切換弁２５．２
６はダイヤフラム作動のものを用いたが、本発明はこれ
を限定されるものではなく、例えば主吸気通路１４のス
ロットル弁１６の開度が設定開度に開かれた際に、電気
的にこれを検出して、第１、第２切換弁を切換える電磁
作動のものを用いてもよいことはいうまでもない。In addition, in the above embodiment, the first and second switching valves 25.2
6 is operated by a diaphragm, but the present invention is not limited to this. For example, when the opening degree of the throttle valve 16 of the main intake passage 14 is opened to the set opening degree, this is electrically operated. Needless to say, an electromagnetically actuated one that detects the changeover valve and switches the first and second switching valves may also be used.
また上記各実施例においては主吸気通路１４および過給
通路１３を夫々独立して燃焼室５に接続したものについ
て説明したが、本発明はこれに限定されるものではなく
、例えば前記特開昭５３−２４９１３号公報に記載され
ているように、主吸気通路と過給通路とを合流させたう
えで燃焼室に接続したものにも適用しうる。Further, in each of the above embodiments, the main intake passage 14 and the supercharging passage 13 are each independently connected to the combustion chamber 5, but the present invention is not limited to this. As described in Japanese Patent No. 53-24913, the present invention can also be applied to a structure in which the main intake passage and the supercharging passage are merged and then connected to the combustion chamber.
以上詳細に説明したことから明らかなように、本発明は
、過給通路の過給機の吐出側、吸込側に夫々第１、第２
分岐部を介して２次エア供給通路および大気導入通路を
接続するとともに、第１分岐部には、下流側過給通路と
２次エア供給通路とを切換える第１切換弁を設ける一方
、２次分岐部には、上流側過給通路と大気導入通路とを
切換える第２切換弁を設け、第１、第２切換弁を同調さ
せて切換えるようにして、エンジンの低負荷時には、大
気導入通路から取入れた空気を過給機により加圧して２
次エアとしてエンジンの排気系に供給する２次エア供給
系を吸気系とは別個に形成するようにしたことを特徴と
する燃料噴射式エンジンの過給装置を提供するものであ
る。As is clear from the detailed explanation above, the present invention provides a supercharging passage with a first and a second on the discharge side and suction side of the supercharger, respectively.
The secondary air supply passage and the atmospheric air introduction passage are connected through the branch part, and the first branch part is provided with a first switching valve that switches between the downstream supercharging passage and the secondary air supply passage. The branch part is provided with a second switching valve that switches between the upstream supercharging passage and the atmosphere introduction passage, and the first and second switching valves are switched in synchronization, so that when the engine is under low load, the air is switched from the atmosphere introduction passage. The intake air is pressurized by a supercharger and
The present invention provides a supercharging device for a fuel injection type engine, characterized in that a secondary air supply system for supplying secondary air to an exhaust system of an engine is formed separately from an intake system.
本発明によれば、エンジンの低負荷時には、吸気系とは
別個の系によって吸気通路に介設した空気量検出装置と
は無関係に取入れた空気を２次エアとして過給機によっ
て送給することができる一方、エンジンの高負荷時には
、上記空気量検出装置によってその量を検出した空気の
一部を過給機によってエンジンの燃焼室に過給すること
ができるので、単一の空気量検出装置によって実際にエ
ンジンの燃焼室に供給される空気量を正確に検出するこ
とができ、しかも過給機を２次エア供給用にも用いるこ
とができるので、過給に伴なう燃料制御を簡単化でき、
過給の目的を損なうことなしに、効率的なエンジンを提
供することができる効果がある。According to the present invention, when the engine is under low load, air is taken in by a system separate from the intake system, regardless of the air amount detection device installed in the intake passage, and is fed as secondary air by the supercharger. On the other hand, when the engine is under high load, part of the air whose amount is detected by the air amount detection device can be supercharged into the combustion chamber of the engine by the supercharger. The amount of air actually supplied to the combustion chamber of the engine can be accurately detected, and the supercharger can also be used for secondary air supply, making fuel control associated with supercharging easy. can be converted into
This has the effect of providing an efficient engine without sacrificing the purpose of supercharging.
図面は本発明に係る燃料噴射式エンジンの過給装置の実
施例を示すエンジンの全体概略説明図である。
Ｅ・・・エンジン、１１・・・吸気通路、１２・・・空
気量検出装置、１３・・・過給通路、１４・・・主吸気
通路、１５・・・過給機、Ｂ・・・燃料噴射装置、１７
・・・第１分岐部、１８・・・第２分岐部、２０・・・
排気通路、２２・・・２次エア供給通路、２３・・・大
気導入通路、２５・・・第１切換弁、２６・・・第２切
換弁。The drawing is an overall schematic explanatory view of an engine showing an embodiment of a supercharging device for a fuel injection type engine according to the present invention. E...Engine, 11...Intake passage, 12...Air amount detection device, 13...Supercharging passage, 14...Main intake passage, 15...Supercharger, B... fuel injection device, 17
...first branch, 18...second branch, 20...
Exhaust passage, 22...Secondary air supply passage, 23...Atmospheric introduction passage, 25...First switching valve, 26...Second switching valve.
Claims (1)
過給通路とを形成する一方、主吸気通路と過給通路との
分岐部よりも上流の吸気通路に吸入空気量を検出する空
気量検出装置を設け、該空気量検出装置の出力信号に応
じて燃料噴射量を制御するようにした燃料噴射式エンジ
ンの過給装置において、 上記過給機下流の過給通路の第１分岐部より分岐して排
気系に２次エアを供給する２次エア供給通路を設けると
ともに、エンジンの運転状態に応じて上記過給機を第１
分岐部下流の過給通路と２次エア供給通路のいずれか一
方に接続する第１切換弁を設ける一方、上記過給機上流
の過給通路の第２分岐部より分岐して大気に開放される
大気導入通路を設けるとともに、上記第１切換弁に同調
して過給機が上記第１分岐部下流の過給通路に接続され
たとき上記第２分岐部上流の過給通路を過給機に接続し
、過給機が上記２次エア供給通路に接続されたとき上記
大気導入通路を過給機に接続する第２切換弁を設けたこ
とを特徴とする燃料噴射式エンジンの過給装置。[Scope of Claims] 1. The intake passage is branched to form a main intake passage and a supercharging passage in which a supercharger is interposed, while the intake passage is located upstream of the branching point between the main intake passage and the supercharging passage. In a supercharging device for a fuel injection engine, an air amount detection device for detecting an intake air amount is provided in the supercharger, and a fuel injection amount is controlled according to an output signal of the air amount detection device. A secondary air supply passage is provided that branches from the first branch of the supercharging passage and supplies secondary air to the exhaust system, and the supercharger is connected to the first branch according to the operating state of the engine.
A first switching valve is provided which connects to either one of the supercharging passage downstream of the branching part and the secondary air supply passage, while the second switching valve is connected to the second branching part of the supercharging passage upstream of the supercharger and is opened to the atmosphere. At the same time, in synchronization with the first switching valve, when the supercharger is connected to the supercharging passage downstream of the first branch, the supercharging passage upstream of the second branch is connected to the supercharging passage. A supercharging device for a fuel injection engine, characterized in that a second switching valve is provided which connects the atmosphere introduction passage to the supercharger when the supercharger is connected to the secondary air supply passage. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9408279A JPS5833374B2 (en) | 1979-07-23 | 1979-07-23 | Fuel injection engine supercharging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9408279A JPS5833374B2 (en) | 1979-07-23 | 1979-07-23 | Fuel injection engine supercharging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5618024A JPS5618024A (en) | 1981-02-20 |
| JPS5833374B2 true JPS5833374B2 (en) | 1983-07-19 |
Family
ID=14100550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9408279A Expired JPS5833374B2 (en) | 1979-07-23 | 1979-07-23 | Fuel injection engine supercharging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5833374B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5975348U (en) * | 1982-11-12 | 1984-05-22 | 三上 正夫 | Installation structure of automobile roof lining |
| JPH0532372Y2 (en) * | 1987-11-28 | 1993-08-19 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57157014A (en) * | 1981-03-23 | 1982-09-28 | Mitsubishi Motors Corp | Air intake unit of supercharged engine |
| JPS5847117A (en) * | 1981-09-14 | 1983-03-18 | Daihatsu Motor Co Ltd | Engine with supercharger |
-
1979
- 1979-07-23 JP JP9408279A patent/JPS5833374B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5975348U (en) * | 1982-11-12 | 1984-05-22 | 三上 正夫 | Installation structure of automobile roof lining |
| JPH0532372Y2 (en) * | 1987-11-28 | 1993-08-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5618024A (en) | 1981-02-20 |
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