JPH0587017A - Assist air control device - Google Patents
Assist air control deviceInfo
- Publication number
- JPH0587017A JPH0587017A JP3248933A JP24893391A JPH0587017A JP H0587017 A JPH0587017 A JP H0587017A JP 3248933 A JP3248933 A JP 3248933A JP 24893391 A JP24893391 A JP 24893391A JP H0587017 A JPH0587017 A JP H0587017A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- negative pressure
- passage
- assist air
- flow rate
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は内燃機関用燃料噴射装置
に係り、とくに運転状態に応じてアシストエアの空気流
量を制御するのに好適なアシストエア制御装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device for an internal combustion engine, and more particularly to an assist air control device suitable for controlling an air flow rate of assist air according to an operating condition.
【０００２】[0002]
【従来の技術】従来の内燃機関用燃料噴射装置は、たと
えば実開平１−７６５５８号公報に記載されているよう
に、エアポンプにより燃料噴射弁にアシストエアを供給
するものが提案されている。2. Description of the Related Art As a conventional fuel injection device for an internal combustion engine, there has been proposed a device for supplying assist air to a fuel injection valve by an air pump, as described in Japanese Utility Model Laid-Open No. 1-76558.
【０００３】また、従来たとえば実開平１−１７３４６
６号公報とくに図５に示されているように、スロットル
弁の上流側から燃料噴射弁へと通じるアシストエア通路
に、スロットル弁の直下流側から負圧導入通路を通して
導かれる吸気管負圧により作動されるダイヤフラム装置
−流量制御弁を設け、スロットル弁全閉時に導入されれ
る負圧によりダイヤフラム装置の流量制御弁の弁体を動
かし、アシストエア通路が絞られてアシストエア量が低
減されるものが提案されている。Further, in the past, for example, actual Kaihei 1-17346.
No. 6, gazette As shown in FIG. 5, in particular, an intake pipe negative pressure is introduced from an immediately downstream side of the throttle valve through a negative pressure introduction passage to an assist air passage leading from the upstream side of the throttle valve to the fuel injection valve. Diaphragm device to be operated-A device provided with a flow rate control valve, in which the negative pressure introduced when the throttle valve is fully closed moves the valve body of the flow rate control valve of the diaphragm device, and the assist air passage is throttled to reduce the amount of assist air. Is proposed.
【０００４】[0004]
【発明が解決しようとする課題】上記前者の従来技術
は、空気ポンプを内燃機関または電動モータにより駆動
しているため、エアポンプから燃料の噴射弁に供給され
る空気流量は回転数によって一義的に決定されていた。
このため、たとえばアイドル回転時、アシストエアを必
要としなくてもエアポンプは回転しているので、アシス
トエアが燃料噴射弁へ供給され混合比が狂い運転性が悪
化するという問題があった。また、同一回転数でも負荷
が異なると、要求されるアシストエアも異なるが、エア
ポンプの空気流量は一定なため、適正な混合比が得られ
ないという点について配慮がされておらず、運転性、エ
ミッション、燃費に悪影響を及ぼすという問題があっ
た。In the former prior art described above, since the air pump is driven by the internal combustion engine or the electric motor, the air flow rate supplied from the air pump to the fuel injection valve is uniquely determined by the number of revolutions. It was decided.
Therefore, for example, at the time of idle rotation, the air pump is rotating even if the assist air is not required, so that the assist air is supplied to the fuel injection valve, and the mixing ratio is disturbed, which deteriorates drivability. Also, even if the load is different at the same speed, the required assist air also differs, but since the air flow rate of the air pump is constant, no consideration is given to the fact that an appropriate mixing ratio cannot be obtained, and drivability is There was a problem that it adversely affected emissions and fuel consumption.
【０００５】また、後者の従来技術では、高速高負荷の
場合は内燃機関の回転数が高く、負荷すなわち吸入負圧
が大きいので、該吸入負圧によりダイヤフラム装置内の
スプリングの弾性力に打ちかってダイヤフラムが下方に
撓んで流量調整弁がアシストエア通路を絞ることにな
る。そのため、燃料噴射弁にアシストエアを十分に供給
することができなくなるという問題があった。Further, in the latter prior art, in the case of high speed and high load, the rotation speed of the internal combustion engine is high and the load, that is, the suction negative pressure is large, so that the suction negative pressure overcomes the elastic force of the spring in the diaphragm device. The diaphragm bends downward, and the flow control valve narrows the assist air passage. Therefore, there is a problem that the assist air cannot be sufficiently supplied to the fuel injection valve.
【０００６】本発明の目的は、運転状態に応じて燃料噴
射弁へのアシストエアの空気流量を最適に制御可能とす
るアシストエア制御装置を提供することにある。An object of the present invention is to provide an assist air control device capable of optimally controlling the air flow rate of the assist air to the fuel injection valve according to the operating condition.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、第１の発明のアシストエア制御装置においては、内
燃機関の吸気側に接続するとともに、スロットル弁を設
置する吸気管を設け、該吸気管の上記スロットル弁上流
側に一端部を接続し、他端部を燃料噴射弁に接続するア
シストエア通路を設けるとともに、該アシストエア通路
にエアポンプおよび流量調整弁を設け、かつ上記吸気管
の上記スロットル弁下流側に一端部が接続する負圧導入
通路を設け、該負圧導入通路には、その他端部に該負圧
導入通路の負圧力により上記流量調整弁の開閉量を調整
する制御弁を設けるとともに、その途中に電磁弁と、開
閉弁を設けたものである。In order to achieve the above object, in the assist air control system of the first invention, an intake pipe connected to the intake side of an internal combustion engine and provided with a throttle valve is provided. One end of the intake pipe is connected to the upstream side of the throttle valve, and the other end is connected to a fuel injection valve. An assist air passage is provided, and an air pump and a flow rate adjusting valve are provided in the assist air passage. A negative pressure introducing passage, one end of which is connected to the downstream side of the throttle valve, is provided to the other end of the negative pressure introducing passage to control the opening / closing amount of the flow rate adjusting valve by the negative pressure of the negative pressure introducing passage. A valve is provided, and an electromagnetic valve and an on-off valve are provided in the middle of the valve.
【０００８】また、第２の発明のアシストエア制御装置
においては、上記電磁弁を複数個設けるとともに、各電
磁弁を異なる開閉量にしたものである。In the assist air control system of the second invention, a plurality of solenoid valves are provided and each solenoid valve has a different opening / closing amount.
【０００９】[0009]
【作用】第１の発明は、通常の一定走行時には、スロッ
トル弁を開にするとともに、コントロールユニットから
の信号により電磁弁が開に、開閉弁が閉になっていて吸
気管からの負圧が負圧導入通路に送入し、制御弁が流量
調整弁を閉じる方向に作用する。しかるに、上記負圧導
入通路に送入した負圧は制御弁内に設けたスプリングの
弾性力より小さいので、流量調整弁は開の状態を保持す
る。そのため、エアポンプからのアシストエアがアシス
トエア通路を通って燃料噴射弁に供給し、燃料噴霧を微
粒化して混合気を完全燃焼させる。According to the first aspect of the present invention, during normal traveling, the throttle valve is opened, the electromagnetic valve is opened by the signal from the control unit, and the opening / closing valve is closed so that the negative pressure from the intake pipe is reduced. The negative pressure is introduced into the passage, and the control valve acts so as to close the flow rate adjusting valve. However, since the negative pressure sent to the negative pressure introducing passage is smaller than the elastic force of the spring provided in the control valve, the flow rate adjusting valve maintains the open state. Therefore, the assist air from the air pump is supplied to the fuel injection valve through the assist air passage to atomize the fuel spray to completely burn the air-fuel mixture.
【００１０】また、アイドル運転時には、スロットル弁
を閉にするとともに、コントロールシステムからの信号
により電磁弁が開に、開閉弁が閉になっていて吸気管か
らの負圧が負圧導入通路に送入する。このときの負圧は
制御弁内に設けたスプリングの弾性力より大きいので、
制御弁はスプリングの弾性力に打ちかって流量調整弁を
閉じる方向に作用し、負圧とスプリングの弾性力とがバ
ランスした位置まで流量調整弁の開度量を絞る。そのた
め、燃料噴射弁の燃料噴霧は微粒化と同時に混合比が適
正に制御される。During idle operation, the throttle valve is closed, the solenoid valve is opened by a signal from the control system, and the on-off valve is closed so that the negative pressure from the intake pipe is sent to the negative pressure introducing passage. To enter. Since the negative pressure at this time is larger than the elastic force of the spring provided in the control valve,
The control valve acts on the elastic force of the spring in the direction to close the flow rate adjusting valve, and reduces the opening amount of the flow rate adjusting valve to a position where the negative pressure and the elastic force of the spring are balanced. Therefore, the fuel spray of the fuel injection valve is atomized and the mixing ratio is appropriately controlled at the same time.
【００１１】さらに、高速高負荷時には、スロットル弁
を開にするとともに、コントロールシステムからの信号
により電磁弁が閉じて吸気管からの負圧の大きい吸入負
圧が負圧導入通路に送入するのを停止するとともに、開
閉弁を開にして負圧導入通路内を大気圧にする。そのた
め、制御弁はスプリングの弾性力により流量調整弁を開
の方向に作用し、エアポンプからの十分な量のアシスト
エアを燃料噴射弁に供給するので、燃料噴射弁の燃料噴
霧は微粒化と同時に混合比が適正に制御され、運転性を
損じることなく、排ガス中の炭化水素を減少させること
ができる。Further, at the time of high speed and high load, the throttle valve is opened and the electromagnetic valve is closed by a signal from the control system so that a large suction negative pressure from the intake pipe is sent to the negative pressure introducing passage. Is stopped and the on-off valve is opened to bring the negative pressure introducing passage to atmospheric pressure. Therefore, the control valve acts on the flow control valve in the opening direction by the elastic force of the spring and supplies a sufficient amount of assist air from the air pump to the fuel injection valve, so that the fuel spray of the fuel injection valve is atomized at the same time. The mixture ratio is appropriately controlled, and the hydrocarbons in the exhaust gas can be reduced without impairing the drivability.
【００１２】また、第２の発明は、複数個の電磁弁の開
閉量を異にしているので、電磁弁を開したときの吸気管
からの吸入負圧量を制御することができる。Further, according to the second aspect of the invention, since the opening and closing amounts of the plurality of solenoid valves are different, it is possible to control the suction negative pressure amount from the intake pipe when the solenoid valves are opened.
【００１３】[0013]
【実施例】以下、本発明の一実施例を示す図により説明
する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１４】図において、１は内燃機関、２は内燃機関
１の吸気部分に接続する吸気管にして、スロットル弁３
およびエアクリーナ４を設置している。５は燃料噴射
弁、６はアシストエア通路にして、一端部を上記吸気管
２の上記スロットル弁３上流側に接続し、他端部を上記
燃料噴射弁５に接続するとともに、その途中にエアポン
プ７および流量調整弁８を設置している。９は負圧導入
通路にして、一端部を上記吸気管２の上記スロットル弁
３下流側に接続し、他端部を制御弁１０に接続し、その
途中に電磁弁１１と、該負圧導入通路９から分岐して大
気に開口する分岐管１５に開閉弁１６を設置している。
上記制御弁１０はその内部をダイヤフラム１２によって
上下２個の室に分割し、上方の室内は大気に接続し、下
方の室内には、上記ダイヤフラム１２を弾性力により常
に上方に撓ませるスプリング１４と、上記ダイヤフラム
１２を上記流量調整弁８に接続する弁棒１３を設置する
とともに、上記負圧導入通路９の他端部が開口してい
る。上記電磁弁１１および開閉弁１６は、図示しないコ
ントロールユニットからの信号により開閉する。In the figure, 1 is an internal combustion engine, 2 is an intake pipe connected to an intake portion of the internal combustion engine 1, and a throttle valve 3
And the air cleaner 4 is installed. 5 is a fuel injection valve, 6 is an assist air passage, one end is connected to the upstream side of the throttle valve 3 of the intake pipe 2, the other end is connected to the fuel injection valve 5, and an air pump 7 and a flow rate adjusting valve 8 are installed. Reference numeral 9 designates a negative pressure introducing passage, one end of which is connected to the intake pipe 2 on the downstream side of the throttle valve 3 and the other end of which is connected to a control valve 10, in the middle of which a solenoid valve 11 and the negative pressure introducing passage are connected. An on-off valve 16 is installed in a branch pipe 15 that branches from the passage 9 and opens to the atmosphere.
The inside of the control valve 10 is divided into two upper and lower chambers by a diaphragm 12, the upper chamber is connected to the atmosphere, and the lower chamber is provided with a spring 14 which constantly bends the diaphragm 12 upward by elastic force. A valve rod 13 that connects the diaphragm 12 to the flow rate adjusting valve 8 is installed, and the other end of the negative pressure introducing passage 9 is open. The solenoid valve 11 and the opening / closing valve 16 are opened / closed by a signal from a control unit (not shown).
【００１５】つぎにアシストエアの制御方法について説
明する。Next, a method of controlling the assist air will be described.
【００１６】通常の一定走行時には、スロットル弁３を
開にするとともに、コントロールユニットからの信号に
より電磁弁１１を開にし、開閉弁１６を閉にすると、吸
気管２からの負圧が負圧導入通路９を通って制御弁１０
の下方室内に送入する。このときの負圧はスプリング１
４の弾性力より小さいので、ダイヤフラム１２はスプリ
ング１４の弾性力によって上方に撓み、弁棒１３を介し
て流量調整弁８を負圧とスプリング１４の弾性力とがバ
ランスする位置まで開く、したがって、エアポンプ７か
らのアシストエアはアシストエア通路６を通って燃料噴
射弁５に供給され、燃料噴霧を微粒化して混合気を完全
燃焼させるで、排ガス中の炭化水素は減少する。During normal constant traveling, when the throttle valve 3 is opened, the solenoid valve 11 is opened by the signal from the control unit, and the opening / closing valve 16 is closed, the negative pressure from the intake pipe 2 is introduced. Control valve 10 through passage 9
Into the room below. The negative pressure at this time is spring 1
Since the diaphragm 12 is smaller than the elastic force of 4, the diaphragm 12 is bent upward by the elastic force of the spring 14, and the flow rate adjusting valve 8 is opened via the valve rod 13 to a position where the negative pressure and the elastic force of the spring 14 are balanced. Assist air from the air pump 7 is supplied to the fuel injection valve 5 through the assist air passage 6 and atomizes the fuel spray to completely burn the air-fuel mixture, so that the hydrocarbons in the exhaust gas are reduced.
【００１７】また、アイドル運転時には、スロットル弁
３を閉じるとともに、コントロールユニットからの信号
により電磁弁１１を開にし、開閉弁１６を閉にすると、
吸気管２からの負圧が負圧導入通路９を通って制御弁１
０の下方室内に送入する。このときの負圧はスプリング
１４の弾性力より大きいので、ダイヤフラム１２はスプ
リング１４の弾性力に打ちかって下方に撓み、弁棒１３
を介して流量調整弁８を閉じる方向に作用し、負圧とス
プリング１４の弾性力がバランスする位置まで流量を絞
るので、燃料噴射弁５からの燃料噴霧を微粒化と同時に
混合比を適正に制御する。When the throttle valve 3 is closed during idling, the solenoid valve 11 is opened and the on-off valve 16 is closed by a signal from the control unit.
The negative pressure from the intake pipe 2 passes through the negative pressure introducing passage 9 and the control valve 1
0 into the lower chamber. Since the negative pressure at this time is larger than the elastic force of the spring 14, the diaphragm 12 bends downward due to the elastic force of the spring 14, and the valve rod 13
The flow rate adjusting valve 8 is actuated in the direction of closing through the to reduce the flow rate to a position where the negative pressure and the elastic force of the spring 14 are balanced, so that the fuel spray from the fuel injection valve 5 is atomized and the mixing ratio is made appropriate Control.
【００１８】さらに、高速高負荷時には、スロットル弁
を開にするとともに、コントロールユニットからの信号
により電磁弁１１を閉にして吸気管２からの負圧の大き
い吸入負圧が負圧導入通路９内に送入すると同時に開閉
弁１６を開にして負圧導入通路９内に大気圧を導入す
る。そのため、制御弁１０の上部室と下部室とが同一圧
力となり、スプリング１４の弾性力によりダイヤフラム
１２が上方に撓んで弁棒１３を介して流量調整弁８を上
記アイドル運転時よりも大きく開かせるので、エアポン
プ７から十分な量のアシストエアを燃料噴射弁５に供給
され、燃料噴射弁５からの燃料噴霧を微粒化と同時に混
合比を適正に制御する。したがって運転性を損じること
なく、排気ガス中の炭化水素を減少することができる。Further, at the time of high speed and high load, the throttle valve is opened, and the solenoid valve 11 is closed by a signal from the control unit so that the suction negative pressure having a large negative pressure from the intake pipe 2 is in the negative pressure introducing passage 9. At the same time, the on-off valve 16 is opened to introduce the atmospheric pressure into the negative pressure introducing passage 9. Therefore, the upper chamber and the lower chamber of the control valve 10 have the same pressure, the elastic force of the spring 14 causes the diaphragm 12 to bend upward, and the flow rate adjusting valve 8 is opened through the valve rod 13 more than during the idle operation. Therefore, a sufficient amount of assist air is supplied from the air pump 7 to the fuel injection valve 5 to atomize the fuel spray from the fuel injection valve 5 and at the same time appropriately control the mixing ratio. Therefore, the hydrocarbons in the exhaust gas can be reduced without impairing the drivability.
【００１９】なお、上記実施例は、電磁弁１１を１個設
置した場合を示すが、電磁弁１１をたとえば２個設ける
とともに、それぞれの電磁弁１１の開口面積を変えるこ
とにより、電磁弁１１開口時の吸気管２から負圧導入通
路９への吸入負圧量を制御することができる。Although the above embodiment shows the case where one solenoid valve 11 is installed, for example, two solenoid valves 11 are provided and the opening area of each solenoid valve 11 is changed to open the solenoid valves 11. At this time, the amount of negative suction pressure from the intake pipe 2 to the negative pressure introduction passage 9 can be controlled.
【００２０】[0020]
【発明の効果】本発明は、以上説明したように構成され
ているので、運転状態に応じて最適な量のアシストエア
を燃料噴射弁に供給することができ、これによって運転
性を損じることなく、排気ガス中の炭化水素を減少する
ことができる。Since the present invention is configured as described above, it is possible to supply an optimum amount of assist air to the fuel injection valve in accordance with the operating state, and thereby the drivability is not impaired. The hydrocarbons in the exhaust gas can be reduced.
【図１】本発明によるアシストエア制御装置を示す説明
図FIG. 1 is an explanatory view showing an assist air control device according to the present invention.
１…内燃機関、２…吸気管、３…スロットル弁、６…ア
シストエア通路、７…エアポンプ、８…流量調整弁、９
…負圧導入通路、１０…制御弁、１１…電磁弁、１６…
開閉弁。DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine, 2 ... Intake pipe, 3 ... Throttle valve, 6 ... Assist air passage, 7 ... Air pump, 8 ... Flow control valve, 9
... Negative pressure introduction passage, 10 ... Control valve, 11 ... Electromagnetic valve, 16 ...
On-off valve.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山田 浩一郎 茨城県勝田市大字高場2520番地 株式会社 日立製作所自動車機器事業部内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichiro Yamada Inventor Koichiro Yamada 2520 Takaba, Katsuta City, Ibaraki Prefecture Hitachi, Ltd. Automotive Equipment Division
Claims (2)
スロットル弁を設置する吸気管を設け、該吸気管の上記
スロットル弁上流側に一端部を接続し、他端部を燃料噴
射弁に接続するアシストエア通路を設けるとともに、該
アシストエア通路にエアポンプおよび流量調整弁を設
け、かつ上記吸気管の上記スロットル弁下流側に一端部
を接続するとともに、電磁弁および開閉弁を設置する負
圧導入通路を設け、該負圧導入通路の他端部に該負圧導
入通路の負圧によって上記流量調整弁の開閉量を制御す
る制御弁を設けたことを特徴とするアシストエア制御装
置。1. Connecting to the intake side of an internal combustion engine,
An intake pipe for installing a throttle valve is provided, one end is connected to the upstream side of the throttle valve of the intake pipe, and an assist air passage is provided for connecting the other end to the fuel injection valve, and an air pump and an air pump are provided in the assist air passage. A flow rate adjusting valve is provided, and one end of the intake pipe is connected to the downstream side of the throttle valve, and a negative pressure introducing passage for installing an electromagnetic valve and an opening / closing valve is provided, and the negative pressure introducing passage is provided at the other end of the negative pressure introducing passage. An assist air control device comprising a control valve for controlling the opening / closing amount of the flow rate adjusting valve according to the negative pressure in the negative pressure introducing passage.
置において、前記電磁弁を複数個設けるとともに、各電
磁弁の開口量が変化することを特徴とするアシストエア
制御装置2. The assist air control apparatus according to claim 1, wherein a plurality of the solenoid valves are provided and an opening amount of each solenoid valve is changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3248933A JPH0587017A (en) | 1991-09-27 | 1991-09-27 | Assist air control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3248933A JPH0587017A (en) | 1991-09-27 | 1991-09-27 | Assist air control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0587017A true JPH0587017A (en) | 1993-04-06 |
Family
ID=17185577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3248933A Pending JPH0587017A (en) | 1991-09-27 | 1991-09-27 | Assist air control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0587017A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10549291B2 (en) | 2013-07-09 | 2020-02-04 | Sames Kremlin | Spray nozzle for electrostatic spraying of a coating product and facility for spraying a coating product including such a spray nozzle |
-
1991
- 1991-09-27 JP JP3248933A patent/JPH0587017A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10549291B2 (en) | 2013-07-09 | 2020-02-04 | Sames Kremlin | Spray nozzle for electrostatic spraying of a coating product and facility for spraying a coating product including such a spray nozzle |
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