JP2003286913A - Liquefied fuel gas injection system - Google Patents
Liquefied fuel gas injection systemInfo
- Publication number
- JP2003286913A JP2003286913A JP2002130184A JP2002130184A JP2003286913A JP 2003286913 A JP2003286913 A JP 2003286913A JP 2002130184 A JP2002130184 A JP 2002130184A JP 2002130184 A JP2002130184 A JP 2002130184A JP 2003286913 A JP2003286913 A JP 2003286913A
- Authority
- JP
- Japan
- Prior art keywords
- intake manifold
- cooling water
- valve
- water passage
- fuel injection
- 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.)
- Withdrawn
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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は液化ガス燃料を使用
する自動車の燃料噴射装置に関し、詳しくは、インテー
クマニホールド内に生じるアイシングを防止することが
できる燃料噴射装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel injection device for a vehicle using liquefied gas fuel, and more particularly to a fuel injection device capable of preventing icing occurring in an intake manifold.
【０００２】[0002]
【従来の技術】液化ガス燃料を使用するエンジンの燃料
噴射弁の噴孔に生じるアイシングを防止するための技術
として、公技番号２００１−３００９号の発明協会公開
技報により公知である。前記公開技報によれば、ＬＰＧ
液噴射インジェクタの先端部に設けた円環状のスペーサ
に温度センサを設けるとともに、スペーサ内部にエンジ
ン冷却水を循環する通路を設け、温度センサの出力信号
が入力されているエンジンＥＣＵにより、インジェクタ
の噴孔周辺部の温度を所定温度（例えば、９０°Ｃ）に
維持できるように、通路の入口部に設けた電磁弁をＯ
Ｎ，ＯＦＦ制御するように構成することにより、燃料噴
射弁の噴孔のアイシング発生を防止することができると
している。2. Description of the Related Art As a technique for preventing icing occurring in a nozzle hole of a fuel injection valve of an engine that uses liquefied gas fuel, it is known from the JIII Journal of Technical Disclosure No. 2001-3009. According to the public technical report, LPG
A temperature sensor is provided in an annular spacer provided at the tip of the liquid injector, and a passage for circulating engine cooling water is provided inside the spacer, and the injector of the injector is injected by the engine ECU to which the output signal of the temperature sensor is input. A solenoid valve provided at the inlet of the passage is turned on so that the temperature around the hole can be maintained at a predetermined temperature (for example, 90 ° C).
According to the publication, it is possible to prevent icing from occurring in the injection hole of the fuel injection valve by configuring the N / OFF control.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上述の
公開技報においては、インジェクタ噴孔部のアイシング
発生は防止することができるが、図３に示すように、噴
射した燃料が突き当たるインテークマニホールド２２の
底部２２ａは、循環冷却水部位から離れているため高温
の冷却水温度にもかかわらず温まらずアイシングが発生
（特に０°Ｃ付近で発生）し、堆積した氷結部分２３が
吸気抵抗となるおそれがあり、また、はがれた氷結部分
２３がエンジン４のシリンダ内に流入してＡ／Ｆ制御性
を損なうおそれがある。また、冷却水をインテークマニ
ホールド２２周辺に流して加熱しアイシングを防止する
技術もあるが、この場合にはインテークマニホールド２
２の温度が上がりすぎて、高温再始動時にインジェクタ
５のベーパロックにより始動性を損なうおそれがある。
そこで本発明は、噴射燃料が突き当たるインテークマニ
ホールドの底部および近接する噴射弁近辺を適温に暖め
ることができるとともに、インテークマニホールドの暖
め過ぎによる高温再始動性の低下を防止できる燃料噴射
装置を提供することを課題とするものである。However, in the above-mentioned public technical report, the occurrence of icing in the injector injection hole can be prevented, but as shown in FIG. 3, the injected manifold 22 of the intake manifold 22 against which the injected fuel strikes. Since the bottom portion 22a is distant from the circulating cooling water portion, icing occurs (especially at around 0 ° C) without warming despite the high temperature of the cooling water, and the accumulated frosted portion 23 may cause intake resistance. There is a possibility that the peeled-off frosted portion 23 may flow into the cylinder of the engine 4 and impair the A / F controllability. There is also a technique of flowing cooling water around the intake manifold 22 to heat it and prevent icing, but in this case, the intake manifold 2 is used.
There is a possibility that the temperature of 2 rises too much and the startability is impaired due to the vapor lock of the injector 5 at the time of high temperature restart.
Therefore, the present invention provides a fuel injection device capable of warming the bottom of the intake manifold where the injected fuel hits and the vicinity of the adjacent injection valve to an appropriate temperature, and preventing deterioration of the high temperature restartability due to overheating of the intake manifold. Is an issue.
【０００４】[0004]
【課題を解決するための手段】前記課題の解決を目的と
してなされた請求項１の発明は、インジェクタが装着さ
れたインテークマニホールドを、断熱部材を介してエン
ジンのシリンダヘッドに固定するよう構成された液化ガ
ス燃料噴射装置において、前記断熱部材の前記インテー
クマニホールド取付面側に、吸気ポートを取り囲むよう
に冷却水通路を設けるとともに前記冷却水通路の下流出
口に感温弁、および連通路を開閉するための開閉弁を設
け、前記エンジンの運転条件により前記開閉弁を作動す
るようにしたことを特徴とする。請求項１によれば、イ
ンテークマニホールドの噴射燃料が突き当たる部位が適
温に暖められアイシングが生じない。また、請求項２の
発明は、アイドル運転時およびエンジン停止時には前記
開閉弁を閉じ、負荷運転時には開くようにしたことを特
徴とする。請求項２によれば、インジェクタ噴孔近辺の
温度上昇が抑制される。なお、吸気ポートを取り囲むよ
うにという表現は、吸気ポートを囲繞、一部囲繞するこ
とを意味する。The invention according to claim 1 made for the purpose of solving the above-mentioned problems is constituted so that an intake manifold having an injector mounted thereon is fixed to a cylinder head of an engine through a heat insulating member. In the liquefied gas fuel injection device, a cooling water passage is provided on the intake manifold mounting surface side of the heat insulating member so as to surround the intake port, and a temperature sensitive valve and a communication passage are opened and closed at a downstream outlet of the cooling water passage. The on-off valve is provided, and the on-off valve is operated according to the operating condition of the engine. According to the first aspect, the portion of the intake manifold where the injected fuel abuts is warmed to an appropriate temperature and icing does not occur. Further, the invention of claim 2 is characterized in that the on-off valve is closed during idle operation and engine stop, and opened during load operation. According to the second aspect, the temperature rise in the vicinity of the injector injection hole is suppressed. In addition, the expression "to surround the intake port" means to surround the intake port or partially surround it.
【０００５】[0005]
【発明の実施の形態】本発明の望ましい実施形態につい
て図面を参照して説明する。図１は本発明の一実施形態
に係る燃料噴射装置の縦断面図で、図２は断熱部材を代
表するガスケットの正面図である。図１および図２にお
いて、液化石油ガス（ＬＰＧ）燃料を使用するエンジン
の液化ガス燃料噴射装置１を構成するインテークマニホ
ールド２はガスケット３を挟んでエンジン４に固定され
ている。インテークマニホールド２には複数のインジェ
クタ５がＯリング６を介して固定されている。また、イ
ンテークマニホールド２のフランジ部２ａには冷却水出
口２ｂが設けられ、冷却水出口２ｂには感温弁を代表す
るサーモバルブ７が気密を保持して固定されている。サ
ーモバルブ７の出口７ａはパイプ状に形成され下流に設
けられた電磁開閉弁８に連通路９ａを経て連通してい
る。電磁開閉弁８の水路系は連通路９ｂを経てラジエー
タに連通され、電気系は駆動回路１１、ＥＣＵ１２に接
続される。なお、感温弁については、本実施形態におい
てはワックス型のサーモバルブ７を使用し冷却水の温度
を感知してその温度に応じて水量を制御することによ
り、一定の冷却水温度、具体的にはエンジン再始動時イ
ンジェクタ５がベーパロックしない温度、すなわち、３
０〜４０°Ｃに保持するよう設定されている。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a fuel injection device according to an embodiment of the present invention, and FIG. 2 is a front view of a gasket representing a heat insulating member. In FIG. 1 and FIG. 2, an intake manifold 2 that constitutes a liquefied gas fuel injection device 1 of an engine that uses liquefied petroleum gas (LPG) fuel is fixed to an engine 4 with a gasket 3 interposed therebetween. A plurality of injectors 5 are fixed to the intake manifold 2 via O-rings 6. A cooling water outlet 2b is provided on the flange portion 2a of the intake manifold 2, and a thermo valve 7 representing a temperature sensitive valve is fixed to the cooling water outlet 2b while maintaining airtightness. The outlet 7a of the thermo valve 7 is formed in a pipe shape and communicates with an electromagnetic opening / closing valve 8 provided downstream through a communication passage 9a. The water channel system of the electromagnetic opening / closing valve 8 is communicated with the radiator via the communication channel 9b, and the electrical system is connected to the drive circuit 11 and the ECU 12. As for the temperature sensitive valve, in the present embodiment, a wax type thermo valve 7 is used to detect the temperature of the cooling water and control the amount of water according to the temperature, so that a constant cooling water temperature, Is the temperature at which the injector 5 does not vapor lock when the engine is restarted, that is, 3
It is set to hold at 0 to 40 ° C.
【０００６】ガスケット３は合成樹脂製の本体３ａによ
り形成され、両側の取付面には薄板状のシール材３ｂが
貼付されている。ガスケット本体３ａのインテークマニ
ホールド取付面側には複数の吸気ポート３ｃを囲繞して
冷却水通路３ｄが刻設されており、冷却水通路３ｄの入
口孔３ｅはエンジン４の冷却水通路に、出口孔３ｆはイ
ンテークマニホールド２の冷却水出口２ｂに連通してい
る。なお、冷却水通路３ｄは噴射燃料が突き当たるイン
テークマニホールド２底部近辺に一部囲繞して設けても
よい。The gasket 3 is formed by a main body 3a made of synthetic resin, and a thin plate-like sealing material 3b is attached to both mounting surfaces. A cooling water passage 3d is engraved on the intake manifold mounting surface side of the gasket body 3a so as to surround the plurality of intake ports 3c. An inlet hole 3e of the cooling water passage 3d is provided in the cooling water passage of the engine 4 and an outlet hole thereof. 3f communicates with the cooling water outlet 2b of the intake manifold 2. It should be noted that the cooling water passage 3d may be provided so as to be partially surrounded near the bottom portion of the intake manifold 2 where the injected fuel abuts.
【０００７】次に、本実施形態の作用について説明す
る。エンジン負荷運転時には暖機により温められた冷却
水はガスケット３に設けられた入口孔３ｅから流入し冷
却水通路３ｄを通過して出口孔３ｆからインテークマニ
ホールド２の冷却水出口２ｂに流出する。この間、冷却
水の熱量は熱伝導作用によりインテークマニホールド２
の吸気ポート３ｃ近辺、すなわち噴射燃料が突き当たる
底部およびインジェクタ５噴孔近辺を暖める。冷却水は
インテークマニホールド２のフランジ部２ａに設けられ
たサーモバルブ７によりその温度を３０〜４０°Ｃの一
定温度を保つよう調整され電磁開閉弁８を経てラジエー
タ１０へと流れる。一方、噴射燃料が突き当たるインテ
ークマニホールド２の底部の温度は冷却水の温度に依存
しているためアイシングは発生しない。電磁開閉弁８は
アイドル信号１３およびイグニッション信号１４をＥＣ
Ｕ１２に取り込みＥＣＵ１２からの駆動信号で駆動回路
１１により作動され、アイドル運転時およびエンジン停
止時は閉じることによりインジェクタ５噴孔近辺の温度
が前記温度（３０〜４０°Ｃ）より低下する。また、負
荷運転時には電磁開閉弁８は開く。Next, the operation of this embodiment will be described. During engine load operation, the cooling water warmed by warming flows in through the inlet hole 3e provided in the gasket 3, passes through the cooling water passage 3d, and flows out through the outlet hole 3f to the cooling water outlet 2b of the intake manifold 2. During this time, the heat quantity of the cooling water is transferred to the intake manifold 2 by the heat conduction effect.
In the vicinity of the intake port 3c, that is, in the vicinity of the bottom where the injected fuel impinges and the injector 5 injection hole, is warmed. The cooling water is adjusted by the thermo valve 7 provided on the flange portion 2a of the intake manifold 2 so as to maintain its temperature at a constant temperature of 30 to 40 ° C., and flows to the radiator 10 via the electromagnetic opening / closing valve 8. On the other hand, icing does not occur because the temperature of the bottom of the intake manifold 2 on which the injected fuel strikes depends on the temperature of the cooling water. The electromagnetic opening / closing valve 8 sends the idle signal 13 and the ignition signal 14 to the EC.
The temperature in the vicinity of the injection hole of the injector 5 becomes lower than the above temperature (30 to 40 ° C.) by being taken into U12 and operated by the drive circuit 11 by the drive signal from the ECU 12 and being closed during idle operation and engine stop. Further, the electromagnetic opening / closing valve 8 is opened during load operation.
【０００８】[0008]
【発明の効果】本発明は上述のように構成されているの
で以下の効果を奏する。すなわち、インテークマニホー
ルドの底部が適温に暖められることによりインテークマ
ニホールド内のアイシング発生を防止することができる
ので吸気抵抗の増大を招くことがなく、また、Ａ／Ｆ制
御性を損なうことがない。同時に、アイドル運転時およ
びエンジン停止時には電磁開閉弁を閉じるので、高温再
始動時のインジェクタのベーパロックによるエンジン再
始動不良をも解消することができる。Since the present invention is configured as described above, it has the following effects. That is, since the bottom of the intake manifold is warmed to an appropriate temperature, it is possible to prevent icing from occurring in the intake manifold, so that the intake resistance is not increased and the A / F controllability is not impaired. At the same time, since the electromagnetic on-off valve is closed during idle operation and engine stop, it is possible to eliminate engine restart failure due to vapor lock of the injector during high temperature restart.
【図１】本発明の一実施形態に係る燃料噴射装置の縦断
面図である。FIG. 1 is a vertical cross-sectional view of a fuel injection device according to an embodiment of the present invention.
【図２】本発明の燃料噴射装置に係るガスケットの正面
図である。FIG. 2 is a front view of a gasket according to the fuel injection device of the present invention.
【図３】従来の燃料噴射装置の縦断面図である。FIG. 3 is a vertical sectional view of a conventional fuel injection device.
１ 液化ガス燃料噴射装置 ２ インテークマニホールド ２ｂ 冷却水出口 ３ ガスケット（断熱部材） ３ａ 本体 ３ｃ 吸気ポート ３ｄ 冷却水通路 ４ エンジン ５ インジェクタ ７ サーモバルブ（感温弁） ８ 電磁開閉弁（開閉弁） ９ａ 連通路 ９ｂ 連通路 1 Liquefied gas fuel injection device 2 intake manifold 2b Cooling water outlet 3 Gasket (heat insulation member) 3a body 3c intake port 3d cooling water passage 4 engine 5 injectors 7 Thermo valve (temperature sensitive valve) 8 Solenoid open / close valve (open / close valve) 9a communication passage 9b communication passage
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中田 和哉 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 内田 光宣 愛知県西尾市下羽角町岩谷14番地 株式会 社日本自動車部品総合研究所内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kazuya Nakata 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto Car Co., Ltd. (72) Inventor Mitsunobu Uchida 14 Iwatani Shimohakaku-cho, Nishio-shi, Aichi Stock Association Company Japan Auto Parts Research Institute
Claims (2)
ニホールドを、断熱部材を介してエンジンのシリンダヘ
ッドに固定するよう構成された液化ガス燃料噴射装置に
おいて、前記断熱部材の前記インテークマニホールド取
付面側に、吸気ポートを取り囲むように冷却水通路を設
けるとともに前記冷却水通路の下流出口に感温弁、およ
び連通路を開閉するための開閉弁を設け、前記エンジン
の運転条件により前記開閉弁を作動するようにしたこと
を特徴とする液化ガス燃料噴射装置。1. A liquefied gas fuel injection device configured to fix an intake manifold, to which an injector is mounted, to a cylinder head of an engine via a heat insulating member, wherein intake air is attached to the intake manifold mounting surface side of the heat insulating member. A cooling water passage is provided so as to surround the port, a temperature sensitive valve is provided at a downstream outlet of the cooling water passage, and an opening / closing valve for opening and closing the communication passage is provided so that the opening / closing valve is operated according to the operating conditions of the engine. A liquefied gas fuel injection device characterized by the above.
は前記開閉弁を閉じ、負荷運転時には開くようにしたこ
とを特徴とする請求項１記載の液化ガス燃料噴射装置。2. The liquefied gas fuel injection device according to claim 1, wherein the on-off valve is closed during idle operation and engine stop and opened during load operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002130184A JP2003286913A (en) | 2002-03-27 | 2002-03-27 | Liquefied fuel gas injection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002130184A JP2003286913A (en) | 2002-03-27 | 2002-03-27 | Liquefied fuel gas injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003286913A true JP2003286913A (en) | 2003-10-10 |
Family
ID=29243961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002130184A Withdrawn JP2003286913A (en) | 2002-03-27 | 2002-03-27 | Liquefied fuel gas injection system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003286913A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008173943A (en) * | 2007-01-22 | 2008-07-31 | Excel Kk | Sealing structure of through hole formed on wall of plastic hollow molded body |
| JP2010138828A (en) * | 2008-12-12 | 2010-06-24 | Nikki Co Ltd | Lpg injector and lpg injection device |
| CN102959226A (en) * | 2011-04-20 | 2013-03-06 | 丰田自动车株式会社 | Fuel supply device for internal combustion engine |
| KR101393536B1 (en) * | 2012-08-09 | 2014-05-09 | 한국기계연구원 | An apparatus for preventing icing of injector using waste heat of vehicle |
| KR102603996B1 (en) * | 2022-12-14 | 2023-11-23 | (주)테너지 | Injector housing for protecting icing in injector |
-
2002
- 2002-03-27 JP JP2002130184A patent/JP2003286913A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008173943A (en) * | 2007-01-22 | 2008-07-31 | Excel Kk | Sealing structure of through hole formed on wall of plastic hollow molded body |
| JP2010138828A (en) * | 2008-12-12 | 2010-06-24 | Nikki Co Ltd | Lpg injector and lpg injection device |
| CN102959226A (en) * | 2011-04-20 | 2013-03-06 | 丰田自动车株式会社 | Fuel supply device for internal combustion engine |
| KR101393536B1 (en) * | 2012-08-09 | 2014-05-09 | 한국기계연구원 | An apparatus for preventing icing of injector using waste heat of vehicle |
| KR102603996B1 (en) * | 2022-12-14 | 2023-11-23 | (주)테너지 | Injector housing for protecting icing in injector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20080092864A1 (en) | Blowby gas passage structure | |
| JP4185531B2 (en) | LPI engine system | |
| US8439016B2 (en) | Liquefied petroleum gas engine assembly with flow control | |
| US8412438B2 (en) | Dual state liquefied petroleum gas engine assembly | |
| WO2007058103A1 (en) | Fuel injection valve | |
| JPH04101056A (en) | Fuel heating device for internal combustion engine | |
| US8474310B2 (en) | Valve freeze control apparatus and sensor element breakage control apparatus for internal combustion engine | |
| US8534260B2 (en) | Fuel supply system | |
| JP2003286913A (en) | Liquefied fuel gas injection system | |
| KR20050003082A (en) | Icing preventing device of injector | |
| JP3967977B2 (en) | Fuel supply device for internal combustion engine | |
| JP2002227726A (en) | Fuel supply device of internal combustion engine | |
| JP2011220235A (en) | Control device of internal combustion engine | |
| JP2007182905A (en) | Fuel supply device of internal combustion engine | |
| JP2000291429A (en) | Hydrocarbon-adding device for exhaust system | |
| JP2000234578A (en) | Nozzle hole deicer for fuel injection valve | |
| JP2002339832A (en) | Fuel control mechanism of dimethyl ether engine | |
| WO2022024578A1 (en) | Egr system | |
| JP2009281324A (en) | Fuel injection valve for internal combustion engine | |
| JP2001323843A (en) | Starting fuel supply device for engine | |
| KR100851468B1 (en) | Variable pressure type fuel-system of lpi engine and control methode thereof | |
| KR20010098186A (en) | Fuel injector having a heater and method for heating fuel to be injected using the injector when engine is started in cold weather | |
| JP2022023773A (en) | EGR system | |
| JP2020084877A (en) | Intake device of internal combustion engine | |
| KR101444950B1 (en) | Cylinder head |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050607 |