JPH01167458A - Fuel injector - Google Patents

Fuel injector

Info

Publication number
JPH01167458A
JPH01167458A JP62324269A JP32426987A JPH01167458A JP H01167458 A JPH01167458 A JP H01167458A JP 62324269 A JP62324269 A JP 62324269A JP 32426987 A JP32426987 A JP 32426987A JP H01167458 A JPH01167458 A JP H01167458A
Authority
JP
Japan
Prior art keywords
valve
fuel injection
intake
branch
fuel
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
JP62324269A
Other languages
Japanese (ja)
Inventor
Tokuo Ishii
石井 徳雄
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.)
Subaru Corp
Original Assignee
Fuji Heavy Industries 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 Fuji Heavy Industries Ltd filed Critical Fuji Heavy Industries Ltd
Priority to JP62324269A priority Critical patent/JPH01167458A/en
Publication of JPH01167458A publication Critical patent/JPH01167458A/en
Pending legal-status Critical Current

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  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

PURPOSE:To maintain stable combustion without feeding over rich mixture gas into a cylinder, in a fuel injector for an internal combustion engine, by arranging a gate valve openable/closable synchronously with the operation of a valve stop mechanism corresponding to a fuel injection port. CONSTITUTION:An injector 24 provided with a plurality of fuel injection ports 23a, 23b for respective branch intake paths 21, 22 is arranged at a branch point to the branch intake paths 21, 22 corresponding to respective intake valves. A solenoid valve 25 is arrange at the fuel injection port 23b for the branch intake path 22 corresponding to an intake valve. Since fuel supply to a branch intake path at stopped side is interrupted during stoppage of valve, over rich mixture gas is not fed to the cylinder upon subsequent resumption of valve operation. By such arrangement, stably combustion can be maintained.

Description

【発明の詳細な説明】[Detailed description of the invention] 【産業上の利用分野】[Industrial application field]

本発明は、バルブ停止機構を具備する内燃機関における
燃料噴射装置に関するものである。
The present invention relates to a fuel injection device for an internal combustion engine that includes a valve stop mechanism.

【従来の技術】[Conventional technology]

1気筒に複数の吸気バルブを有し、各吸気バルブに対応
する分岐吸気通路への分岐点に位置して各分岐吸気通路
への複数の燃料噴射口を有するインジェクタが配置され
ている吸気系は、特開昭55−119957号公報所載
のものなどで公知である。 このような構成では、インジェクタを各吸気バルブ対応
で用意する必要がなく、全体的には構成が簡素化される
というメリットがある。
An intake system has a plurality of intake valves in one cylinder, and an injector having a plurality of fuel injection ports to each branch intake passage is arranged at a branch point to a branch intake passage corresponding to each intake valve. , published in Japanese Patent Application Laid-Open No. 55-119957, etc. are well known. Such a configuration has the advantage that there is no need to prepare an injector for each intake valve, and the overall configuration is simplified.

【発明が解決しようとする問題点】[Problems to be solved by the invention]

しかしながら、このような構成の燃料噴射装置を、その
まま、バルブ停止機構を有する内燃機関に適用しようと
すると、次の問題を生ずる。すなわら、バルブ停止機構
によって、例えば、車速が所定値以下で、一方の吸気バ
ルブを閉じるように制御された時、停止された側の分岐
吸気通路へも上記インジェクタから、対応する燃料噴射
口を介して燃料が1171射され、上記停止側の分岐吸
気通路が過温状態となる。そして、次に停止状態が解除
された時、対応する吸気バルブの開放の際に、上記停止
側の分岐吸気通路に溜った燃料が気筒内に導入され、燃
焼を不安定にするという欠点がある。 本発明は、上記事情にもとづいてなされたもので、各分
岐吸気通路への分岐点に1つのインジエフタを設置し、
そこから燃料を各分岐吸気通路へそれぞれ対応する複数
の燃料噴射口から供給する場合、吸気バルブの停止機構
が働く側の燃料噴射口については、上記停止機構の動作
と同期して燃料噴射を停止できるようにし、停止期間中
、停止側の分岐吸気通路への燃料供給を遮断できるよう
にした燃料噴射装置を提供しようとするものである。
However, if a fuel injection device having such a configuration is applied as it is to an internal combustion engine having a valve stop mechanism, the following problem will occur. That is, when the valve stop mechanism controls one intake valve to close, for example, when the vehicle speed is below a predetermined value, the injector also connects the corresponding fuel injection port to the branch intake passage on the stopped side. 1171 of fuel is injected through the engine, and the branch intake passage on the stop side becomes overtemperature. Then, when the stopped state is released, the fuel accumulated in the branched intake passage on the stopped side is introduced into the cylinder when the corresponding intake valve is opened, making combustion unstable. . The present invention has been made based on the above circumstances, and includes installing one injector at the branch point to each branch intake passage,
When fuel is supplied from there to each branch intake passage from multiple fuel injection ports, the fuel injection port on the side where the intake valve stop mechanism operates will stop fuel injection in synchronization with the operation of the stop mechanism. It is an object of the present invention to provide a fuel injection device that can cut off the fuel supply to the branch intake passage on the stop side during the stop period.

【問題点を解決するための手段】[Means to solve the problem]

このため、本発明では、1気筒に複数の吸気バルブを有
し、各吸気バルブに対応する分岐吸気通路への分岐点に
位置して各分岐吸気通路への複数の燃料噴射口を有する
インジェクタが配置されている吸気系において、上記イ
ンジェクタに、バルブ停止機構によって吸気バルブの一
方が停止される側の上記燃料噴射口に対応して、上記バ
ルブ停止機構に同期して開閉される開閉弁を設置してい
る。
Therefore, in the present invention, an injector is provided which has a plurality of intake valves in one cylinder, is located at a branch point to a branch intake passage corresponding to each intake valve, and has a plurality of fuel injection ports to each branch intake passage. In the intake system, an on-off valve that opens and closes in synchronization with the valve stop mechanism is installed in the injector, corresponding to the fuel injection port on the side where one of the intake valves is stopped by the valve stop mechanism. are doing.

【作  用】[For production]

したがって、バルブ停止側の分岐吸気通路への燃料供給
が、バルブ停止機構が働いている間、遮断されるから、
上記分岐吸気通路で、混合気が過濃になり燃料が溜るこ
ともなく、次にバルブ停止が解除されても、適正な空燃
比の混合気が気筒に供給でき、燃焼が安定に維持できる
ことになる。
Therefore, the fuel supply to the branch intake passage on the valve stop side is cut off while the valve stop mechanism is working.
With the above-mentioned branch intake passage, the air-fuel mixture will not become too rich and fuel will not accumulate, and even when the valve stop is canceled next time, the air-fuel mixture with the appropriate air-fuel ratio can be supplied to the cylinder, and combustion can be maintained stably. Become.

【実 施 例】【Example】

以下、本発明の一実施例を図面を参照して具体的に説明
する。図において、符号1.1′は、互いにビン2を介
して連結されるカムシャフトであり、ここには、各気筒
に対応してそれぞれ一体的に形成されるカム3および回
動自在に嵌合されたカム4が配設されている。上記カム
シャフト1゜1′の接合部分は、中央のジャーナル5で
軸支されており、上記カム4の一端に形成したシリンダ
部4aは上記ジャーナル5に形成した突出部5aに摺動
自在に嵌合されていて、上記シリンダ部4aとカムシャ
フト1(1’)と突出部5aとで囲まれた空間に油圧室
6を形成している。一方、上記カムシャフト1(1’)
と上記カム4の他端とには、互いに偏心したテーパ嵌合
部1aおよび4bが形成してあって、回転方向に関して
、所定の位相の時、カム4とカムシャフト1(1’)と
の回転方向に対する係合を達成できるようにしである。 そして、上記カム4は、カムシャフト1(1’)に設け
たコイルスプリング7で油圧杢6の方向に弾持されてい
る。上記油圧室6はジャーナル5に設けた油圧通路8を
介して三方切換弁9に連通されており、上記三方切換弁
9は、ポンプ10のデリバリ側と上記油圧通路8を連通
し、あるいは上記油圧通路8とドレン通路11とを連通
ずるように切換え動作できるようになっている。 また、上記カム3および4に対応して、ロッカアーム1
2および13が用意されていて、1つの気筒14に対し
て設けた吸気バルブ15および1Gの各リフタ17およ
び1Bに当1妄されている。なお、各リフタ17および
18は、バルブスプリング19および20で上記ロッカ
アーム12および13に弾接されている。上記吸気バル
ブ15および16に対応する分岐吸気通路21および2
2への分岐点に位置して、吸気通路23には、各分岐吸
気通路21および22へ燃料を供給する2つの燃料噴射
口23aおよび23bを備えたインジェクタ24が設け
られている。 そして、上記吸気バルブ16に対応する側の分岐吸気通
路22への燃料噴射口23bには、ソレノイドバルブ2
5が設けてあり、ソレノイドコイル25aへの電気的付
勢で、上記燃料噴射口23bからの燃料噴射をm1li
するように閉側に動作される。 −[記三方切換弁9および上記ソレノイドバルブ25へ
の制御信号は、比較回路26から与えられるようになっ
ており、上記比較回路26では、エンジン回転数センサ
27で検出したエンジン回転数と、基準値とを比較し、
上記エンジン回転数が上記基準値以下では制御信号を出
して三方切換弁9のソレノイドコイルを付勢し、油圧通
路8をドレン11に連通すると共に、ソレノイドバルブ
25へ制御信号を出してソレノイドコイル25aを附勢
するようになっている。 このような構成では、アイドリングなどの運転状態では
、ソレノイドバルブ25が閉じていて、燃料噴射口23
bから分岐吸気通路22への燃料噴射が遮断されている
。そして、この時には、油圧通路8はドレン通路11に
連通し、カム4はスプリング7の働きで、油圧室6側に
押されるため、テーパ嵌合部4bがテーパ嵌合部1aよ
り離れており、したがって、カムシャフト1(1’)と
カム4との回転方向への係止は解除されている。このた
め、ロッカアーム13は停止状態になり、吸気バルブ1
6は閉じた状態で動作を停止する。このため、各気筒で
は、一方の吸気バルブ15のみが開閉動作し、分岐吸気
通路21からのみ、吸気を達成する。この場合、前述の
ように、燃料噴射口23bが閉じられているため、燃料
噴射口23aから分岐吸気通路21への燃料噴射は維持
されるが、吸気のなされない分岐吸気通路22への燃料
供給は行なわれない。 次に、走行状態などの他の運転状態に切換って、エンジ
ン回転数が上昇されると、比較回路26からの制御信号
が断れるから、三方切換弁9はソレノイドの消勢で、油
圧通路8をポンプ10側に連通ずる。このため、圧油が
油圧室6に入り、カムシャフト1(1’)の位相がカム
4に対して一致した時、テーパ嵌合部4bがテーパ嵌合
部1a1.:嵌合し、回転方向に関してカム4とカムシ
ャフト1(1’)とが係合される。このため、カム4の
動作がロッカアーム13を介してリフタ18に伝えられ
、吸気バルブ16が開閉動作を再開する。この時、ソレ
ノイドバルブ25のソレノイドコイル25aに対する信
号がなく、ソレノイドコイル25aが消勢されるので、
ソレノイドバルブ25は開放され、燃料噴射口23bか
らの燃料噴射が分岐吸気通路22に対して行なわれる。 したがって、バルブ停止期間中、分岐吸気通路22への
燃料供給がなされていないので、バルブ停止が解除され
て、再び吸気バルブ16が開いて分岐吸気通路22への
燃料噴射がなされる場合、分岐吸気通路22には燃料が
溜っていないので、過濃混合気が気筒にもたらされるこ
とがなく、安定した燃焼が維持される。 なお、上記実施例では、電気信号でソレノイドバルブ2
5を開閉制御するようにしたが、バルブ停止機構のオン
、オフ動作の時の油圧切換で切換わる油圧によりインジ
ェクタにおけるバルブ停止制御側の燃料噴射口のバルブ
開閉制御を行ってもよいことは勿論である。
Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. In the figure, reference numeral 1.1' denotes a camshaft that is connected to each other via a pin 2, and a cam 3 and a cam 3 that are integrally formed corresponding to each cylinder and rotatably fitted therein are connected to each other via a pin 2. A cam 4 is provided. The joint portion of the camshaft 1゜1' is pivotally supported by a central journal 5, and a cylinder portion 4a formed at one end of the cam 4 is slidably fitted into a protrusion 5a formed on the journal 5. A hydraulic chamber 6 is formed in a space surrounded by the cylinder portion 4a, the camshaft 1 (1'), and the protruding portion 5a. On the other hand, the above camshaft 1 (1')
and the other end of the cam 4 are formed with mutually eccentric tapered fitting parts 1a and 4b, so that when the cam 4 and the camshaft 1 (1') are in a predetermined phase with respect to the rotation direction, the cam 4 and the camshaft 1 (1') This allows engagement in the direction of rotation to be achieved. The cam 4 is elastically supported in the direction of the hydraulic heather 6 by a coil spring 7 provided on the camshaft 1 (1'). The hydraulic chamber 6 communicates with a three-way switching valve 9 via a hydraulic passage 8 provided in the journal 5, and the three-way switching valve 9 communicates the delivery side of the pump 10 with the hydraulic passage 8, or the hydraulic pressure The passage 8 and the drain passage 11 can be switched to communicate with each other. Also, corresponding to the cams 3 and 4, rocker arm 1
2 and 13 are prepared, and are connected to the intake valve 15 provided for one cylinder 14 and each lifter 17 and 1B of 1G. The lifters 17 and 18 are in elastic contact with the rocker arms 12 and 13 by valve springs 19 and 20. Branch intake passages 21 and 2 corresponding to the intake valves 15 and 16
2, the intake passage 23 is provided with an injector 24 having two fuel injection ports 23a and 23b for supplying fuel to each branch intake passage 21 and 22. A solenoid valve 2 is provided at the fuel injection port 23b to the branch intake passage 22 on the side corresponding to the intake valve 16.
5 is provided, and by electrically energizing the solenoid coil 25a, the fuel injection from the fuel injection port 23b is performed m1li.
It is operated to the closed side so that the - [Control signals to the three-way switching valve 9 and the solenoid valve 25 are given from a comparison circuit 26, and the comparison circuit 26 compares the engine rotation speed detected by the engine rotation speed sensor 27 with the reference Compare with the value,
When the engine speed is below the reference value, a control signal is issued to energize the solenoid coil of the three-way switching valve 9 to communicate the hydraulic passage 8 to the drain 11, and a control signal is issued to the solenoid valve 25 to energize the solenoid coil 25a of the three-way switching valve 9. It is designed to encourage In such a configuration, in an operating state such as idling, the solenoid valve 25 is closed and the fuel injection port 23 is closed.
Fuel injection from b to the branch intake passage 22 is blocked. At this time, the hydraulic passage 8 communicates with the drain passage 11, and the cam 4 is pushed toward the hydraulic chamber 6 by the action of the spring 7, so the tapered fitting part 4b is separated from the tapered fitting part 1a. Therefore, the camshaft 1 (1') and the cam 4 are no longer locked in the rotational direction. Therefore, the rocker arm 13 is in a stopped state, and the intake valve 1
6 stops operating in the closed state. Therefore, in each cylinder, only one intake valve 15 opens and closes, and intake is achieved only from the branch intake passage 21. In this case, as described above, since the fuel injection port 23b is closed, fuel injection from the fuel injection port 23a to the branch intake passage 21 is maintained, but fuel is not supplied to the branch intake passage 22 where air is not taken. is not carried out. Next, when switching to another operating state such as a running state and increasing the engine speed, the control signal from the comparator circuit 26 is cut off, so the three-way selector valve 9 de-energizes the solenoid and the hydraulic passage 8 is communicated with the pump 10 side. Therefore, when pressurized oil enters the hydraulic chamber 6 and the phase of the camshaft 1 (1') matches the cam 4, the tapered fitting portion 4b moves to the tapered fitting portion 1a1. : They fit together, and the cam 4 and the camshaft 1 (1') are engaged with each other in the rotational direction. Therefore, the operation of the cam 4 is transmitted to the lifter 18 via the rocker arm 13, and the intake valve 16 resumes its opening/closing operation. At this time, there is no signal to the solenoid coil 25a of the solenoid valve 25, and the solenoid coil 25a is deenergized.
The solenoid valve 25 is opened, and fuel is injected from the fuel injection port 23b into the branch intake passage 22. Therefore, since fuel is not supplied to the branch intake passage 22 during the valve stop period, when the valve stop is canceled and the intake valve 16 is opened again to inject fuel into the branch intake passage 22, the branch intake passage 22 is injected with fuel. Since no fuel is accumulated in the passage 22, a rich mixture is not brought into the cylinder, and stable combustion is maintained. In the above embodiment, the solenoid valve 2 is activated by an electric signal.
5, the opening and closing of the fuel injection port on the valve stop control side of the injector may of course be controlled by the hydraulic pressure that is switched when the valve stop mechanism is turned on and off. It is.

【発明の効果】【Effect of the invention】

本発明は、以上詳述したようにになり、吸気バルブの停
止機構が働く側の燃料噴射口については、上記停止機構
の動作と同期して燃料噴射を停止できるようにしたので
、停止期間中、停止側の分岐吸気通路への燃料供給が遮
断されるから、その後、バルブ駆動を再開した時に、過
a混合気が気筒へ供給されることがなく、燃焼の安定が
維持されるという効果が得られる。
The present invention has been described in detail above, and for the fuel injection port on the side where the stop mechanism of the intake valve operates, fuel injection can be stopped in synchronization with the operation of the stop mechanism, so that during the stop period Since the fuel supply to the branch intake passage on the stop side is cut off, when the valve drive is restarted afterwards, the excess aeration mixture will not be supplied to the cylinder, and the stability of combustion will be maintained. can get.

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

第1図°は本発明の一実施例を示す動弁系の縦断側面図
、第2図は、吸気系の断面図である。 3.4・・・カム、6・・・油圧室、9・・・三方切換
弁、10・・・ポンプ、11・・・ドレン、12.13
・・・ロッカアーム、15、16・・・吸気バルブ、2
1.22・・・分岐吸気通路、23・・・吸気通路、2
3a 、 23b・・・燃料噴射口、24・・・インジ
ェクタ、25・・・ソレノイドバルブ、26・・・比較
回路、27・・・エンジン回転数センサ。 同  弁理士  村 井   進
FIG. 1 is a longitudinal sectional side view of a valve train system showing one embodiment of the present invention, and FIG. 2 is a sectional view of an intake system. 3.4...Cam, 6...Hydraulic chamber, 9...Three-way switching valve, 10...Pump, 11...Drain, 12.13
...Rocker arm, 15, 16...Intake valve, 2
1.22... Branch intake passage, 23... Intake passage, 2
3a, 23b... Fuel injection port, 24... Injector, 25... Solenoid valve, 26... Comparison circuit, 27... Engine rotation speed sensor. Patent attorney Susumu Murai

Claims (1)

【特許請求の範囲】[Claims]  1気筒に複数の吸気バルブを有し、各吸気バルブに対
応する分岐吸気通路への分岐点に位置して各分岐吸気通
路への複数の燃料噴射口を有するインジエクタが配置さ
れている吸気系において、上記インジエクタに、バルブ
停止機構によって吸気バルブの一方が停止される側の上
記燃料噴射口に対応して、上記バルブ停止機構に同期し
て開閉される開閉弁を設置したことを特徴とする燃料噴
射装置。
In an intake system in which one cylinder has a plurality of intake valves, and an injector having a plurality of fuel injection ports to each branch intake passage is arranged at a branch point to a branch intake passage corresponding to each intake valve. , wherein the injector is provided with an on-off valve that opens and closes in synchronization with the valve stop mechanism, corresponding to the fuel injection port on the side where one of the intake valves is stopped by the valve stop mechanism. Injection device.
JP62324269A 1987-12-21 1987-12-21 Fuel injector Pending JPH01167458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62324269A JPH01167458A (en) 1987-12-21 1987-12-21 Fuel injector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62324269A JPH01167458A (en) 1987-12-21 1987-12-21 Fuel injector

Publications (1)

Publication Number Publication Date
JPH01167458A true JPH01167458A (en) 1989-07-03

Family

ID=18163924

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62324269A Pending JPH01167458A (en) 1987-12-21 1987-12-21 Fuel injector

Country Status (1)

Country Link
JP (1) JPH01167458A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011270A1 (en) * 1995-09-21 1997-03-27 Robert Bosch Gmbh Fuel injection valve
KR100598810B1 (en) * 2004-06-29 2006-07-10 현대자동차주식회사 Injector nozzle shape adjustment device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011270A1 (en) * 1995-09-21 1997-03-27 Robert Bosch Gmbh Fuel injection valve
US5819707A (en) * 1995-09-21 1998-10-13 Robert Bosch Gmbh Fuel injection valve
KR100598810B1 (en) * 2004-06-29 2006-07-10 현대자동차주식회사 Injector nozzle shape adjustment device

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