JP2009047036A - Gas fuel supply device of engine - Google Patents

Gas fuel supply device of engine Download PDF

Info

Publication number
JP2009047036A
JP2009047036A JP2007212609A JP2007212609A JP2009047036A JP 2009047036 A JP2009047036 A JP 2009047036A JP 2007212609 A JP2007212609 A JP 2007212609A JP 2007212609 A JP2007212609 A JP 2007212609A JP 2009047036 A JP2009047036 A JP 2009047036A
Authority
JP
Japan
Prior art keywords
chamber
air
gas fuel
back pressure
negative 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
Application number
JP2007212609A
Other languages
Japanese (ja)
Inventor
Toshio Namatame
利夫 生田目
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.)
Nikki Co Ltd
Original Assignee
Nikki Co 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 Nikki Co Ltd filed Critical Nikki Co Ltd
Priority to JP2007212609A priority Critical patent/JP2009047036A/en
Publication of JP2009047036A publication Critical patent/JP2009047036A/en
Pending legal-status Critical Current

Links

Images

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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Landscapes

  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To excellently maintain an engine operation state, by securing stability of the air-fuel ratio in response to all states, in a gas fuel supply device for sending out gas fuel to an intake passage from a mixer by vaporizing by reducing pressure to a pressure of about atmospheric pressure by a regulator. <P>SOLUTION: This inner vent type gas fuel supply device has the regulator 3 and the mixer 4, and connects the intake passage 2 on the downstream side of an air cleaner 5 and a back pressure chamber 31 of the regulator 3 by a pipe 7. A valve mechanism 6 as an atmosphere introducing valve means is connected to the back pressure chamber 31. The valve mechanism 6 has an atmospheric hole 60a. A needle valve 63 arranged in its communicating passage is opened larger as the intake negative pressure gets larger to introduce the atmospheric air to the back pressure chamber 31 side, and an excessive quantity of the negative pressure applied to the back pressure chamber 31 is reduced by adjusting an atmospheric quantity introduced to the back pressure chamber 31 side in response to a load state of engine operation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、圧力容器に充填されたＬＰＧ（液化天然ガス）等のガス燃料をレギュレータで大気圧程度の圧力に減圧・気化し、調圧されたガス燃料をミキサから吸気通路に送出してエンジンに供給するガス燃料供給装置に関する。   In the present invention, a gas fuel such as LPG (liquefied natural gas) filled in a pressure vessel is decompressed and vaporized to a pressure of about atmospheric pressure by a regulator, and the regulated gas fuel is sent from a mixer to an intake passage. The present invention relates to a gas fuel supply device to be supplied to the vehicle.

ガス燃料、一般には液化石油ガス（ＬＰＧ）または圧縮天然ガス（ＣＮＧ）をエンジンに供給する装置として、圧力容器に充填した高圧・液状のガス燃料をレギュレータで大気圧程度の圧力に減圧調整し、これをミキサを通過する吸入空気流により生じる負圧で吸引させて吸気通路に送り、エンジンに供給する装置が汎用されている。   As a device for supplying gas fuel, generally liquefied petroleum gas (LPG) or compressed natural gas (CNG) to the engine, the pressure of the high pressure / liquid gas fuel filled in the pressure vessel is reduced to a pressure of about atmospheric pressure with a regulator, A device is widely used in which this is sucked with a negative pressure generated by an intake air flow passing through a mixer, sent to an intake passage, and supplied to an engine.

このような装置のうち、高圧のガス燃料を適度な圧力に減圧・調整するためのレギュレータが、調圧室とダイヤフラムで仕切られた背圧室に大気孔を有するアウターベント式のものである場合、エアクリーナが目詰まりを起こした場合に背圧室にかかる負圧が増大してガス流量が過剰に増加するため、リッチエンストに陥るトラブルに陥ることになる。   Among these devices, when the regulator for depressurizing and adjusting the high-pressure gas fuel to an appropriate pressure is of the outer vent type having an air hole in the back pressure chamber partitioned by the pressure regulating chamber and the diaphragm When the air cleaner is clogged, the negative pressure applied to the back pressure chamber increases and the gas flow rate increases excessively, resulting in a trouble that causes a rich engine.

この対策として、図４の縦断面図に示すガス燃料供給装置のように、吸気通路２のエアクリーナ５下流側部分を配管７でレギュレータ３の背圧室３１に接続して、エアクリーナ５が目詰まりしたときに吸気通路２の吸気負圧を背圧室３１に導入することにより、調圧室３０に作用する負圧で燃料が過剰に流入することを回避して、オーバーリッチを防止するようにしたインナーベント式のものが知られている（例えば特開平９−２５０４０１号公報参照）。   As a countermeasure, the air cleaner 5 downstream side portion of the intake passage 2 is connected to the back pressure chamber 31 of the regulator 3 by the pipe 7 as in the gas fuel supply device shown in the longitudinal sectional view of FIG. By introducing the intake negative pressure of the intake passage 2 into the back pressure chamber 31 at this time, it is possible to avoid excessive flow of fuel due to the negative pressure acting on the pressure adjusting chamber 30 and prevent overrich. An inner vent type is known (see, for example, JP-A-9-250401).

ところが、前記インナーベント式のガス燃料供給装置においては、エンジン高負荷運転時にレギュレータ３の背圧室３１にかかる負圧が増大すると、ダイヤフラム３２が弁体３３を閉弁方向に動作させるために調圧室３０から送出される燃料流量が過剰に減少し、今度は逆にリーンとなってエンストが発生しやすくなるという問題がある。
特開平９−２５０４０１号公報 However, in the inner vent type gas fuel supply device, when the negative pressure applied to the back pressure chamber 31 of the regulator 3 increases during engine high load operation, the diaphragm 32 adjusts the valve body 33 in the valve closing direction. There is a problem that the flow rate of the fuel delivered from the pressure chamber 30 decreases excessively, and this time, on the contrary, becomes lean and engine stall is likely to occur.
JP-A-9-250401

本発明は、上記のような問題点を解決しようとするものであり、レギュレータでガス燃料を所定圧力に減圧・気化してミキサから吸気通路に送出するガス燃料供給装置について、あらゆる状況に対応して空燃比の安定性を確保してエンジン運転状態を良好に維持できるようにすることを課題とする。   The present invention is intended to solve the above-described problems. A gas fuel supply apparatus that depressurizes and vaporizes gas fuel to a predetermined pressure with a regulator and sends the gas fuel to the intake passage from the mixer. It is an object of the present invention to ensure the stability of the air-fuel ratio and maintain the engine operating state satisfactorily.

そこで、本発明は、圧力容器に充填されたガス燃料を所定の圧力に減圧・気化させるレギュレータ及び前記レギュレータにて調圧後のガス燃料をエンジンにおけるエアクリーナの下流に設けた吸気通路に送出するミキサを備え、前記吸気通路と前記レギュレータの背圧室とが配管で接続されたインナーベント式のガス燃料供給装置において、前記レギュレータの背圧室に大気導入バルブ手段が接続されており、この大気導入バルブ手段は大気孔を有して該大気孔への連通路に設けたバルブを吸気負圧が増大するに従って大きく開放して前記背圧室側に大気を導入することにより、エンジン運転の負荷状態に応じて前記背圧室側に導入する大気量を調整することにより前記背圧室にかかる負圧の過剰分を縮小させることを特徴とする。   Accordingly, the present invention provides a regulator that depressurizes and vaporizes gas fuel filled in a pressure vessel to a predetermined pressure, and a mixer that sends the gas fuel adjusted by the regulator to an intake passage provided downstream of an air cleaner in the engine. An air vent valve means is connected to the back pressure chamber of the regulator, and the air introduction valve means is connected to the back pressure chamber of the regulator. The valve means has an air hole, and the valve provided in the communication path to the air hole is largely opened as the intake negative pressure increases, and the air is introduced into the back pressure chamber side. Accordingly, the amount of the negative pressure applied to the back pressure chamber is reduced by adjusting the amount of air introduced into the back pressure chamber.

レギュレータの背圧室を吸気通路に接続したことでエアクリーナ目詰まり時のオーバーリッチ化を軽減できるが、これに加え、このようにエンジン運転が高負荷状態になるに従って多くの大気を背圧室側に導入して送出燃料の空燃比変動幅を縮小させる方向にコントロールすることで、高負荷運転時にリーン状態に陥ることを有効に回避する。   By connecting the back pressure chamber of the regulator to the intake passage, it is possible to reduce over-richness when the air cleaner is clogged, but in addition to this, as the engine operation becomes high load, more air is drawn to the back pressure chamber side. In this way, the air-fuel ratio fluctuation range of the delivered fuel is controlled to be reduced, so that the lean state can be effectively avoided during high-load operation.

また、その大気導入バルブ手段はダイヤフラムで区画された負圧導入室を有し、この負圧導入室がエアクリーナ下流の吸気通路に配管で接続され、この負圧導入室に吸気負圧を導入しダイヤフラムを変位させることでバルブを開閉させて大気導入量をコントロールするものとすれば、エンジンの運転の低負荷状態から高負荷状態への変動により的確に対応しやすいものとなる。   The air introduction valve means has a negative pressure introduction chamber partitioned by a diaphragm, and this negative pressure introduction chamber is connected to an intake passage downstream of the air cleaner by a pipe, and introduces intake negative pressure into the negative pressure introduction chamber. If the amount of air introduced is controlled by opening and closing the valve by displacing the diaphragm, it becomes easier to respond accurately due to the fluctuation of the engine operation from the low load state to the high load state.

この場合、そのレギュレータの背圧室と吸気通路とを接続する配管の途中に、大気導入バルブ手段の負圧導入室と吸気通路とを接続するための配管が接続されているとともに、その接続位置の上流側に大気圧導入バルブ手段からレギュレータの背圧室に大気を導入させるための配管が接続されている場合には、既存のインナーベント式ガス燃料供給装置を使用して容易に製造することができる。   In this case, a pipe for connecting the negative pressure introduction chamber of the air introduction valve means and the intake passage is connected in the middle of the pipe connecting the back pressure chamber of the regulator and the intake passage, and the connection position thereof. When the piping for introducing the atmosphere from the atmospheric pressure introduction valve means to the back pressure chamber of the regulator is connected upstream of the valve, it should be easily manufactured using the existing inner vent type gas fuel supply device Can do.

インナーベント式ガス燃料供給装置のレギュレータ背圧室側にエンジンの負荷状態に応じた適当量の大気を導入するという本発明によると、エアクリーナ目詰まり時からエンジン高負荷運転時等、あらゆる状況に対応して空燃比の安定性を確保し、エンジン運転状態を良好に維持することができる。   According to the present invention of introducing an appropriate amount of air according to the engine load condition into the regulator back pressure chamber side of the inner vent type gas fuel supply device, it can handle all situations such as clogged air cleaner to high engine load operation Thus, the stability of the air-fuel ratio can be ensured, and the engine operating state can be maintained well.

以下に、図面を参照しながら本発明における最良の実施の形態を説明する。   The best mode of the present invention will be described below with reference to the drawings.

図１は本発明における実施の形態のエンジンのガス燃料供給装置を配設した燃料供給システムの一部を示す配置図であり、この燃料供給システムは、ＬＰＧなどのガス燃料をレギュレータ３で所定圧力の気体にして吸気通路２の負圧で吸引させ、図示しないガスエンジンに供給するものである。吸気通路２の基端側にはエアクリーナ５が配設され、その下流側にはベンチュリ４１及び燃料ノズル４０を有するミキサ４が配設されており、レギュレータ３から延設された燃料供給配管９が燃料ノズル４０に接続され、調圧されたガス燃料を吸気通路２内に噴出させるようになっている。   FIG. 1 is a layout diagram showing a part of a fuel supply system in which a gas fuel supply device for an engine according to an embodiment of the present invention is provided. This fuel supply system uses a regulator 3 to apply gas fuel such as LPG to a predetermined pressure. The gas is sucked at the negative pressure of the intake passage 2 and supplied to a gas engine (not shown). An air cleaner 5 is disposed on the proximal end side of the intake passage 2, and a mixer 4 having a venturi 41 and a fuel nozzle 40 is disposed on the downstream side thereof, and a fuel supply pipe 9 extending from the regulator 3 is provided. Connected to the fuel nozzle 40, pressure-regulated gas fuel is jetted into the intake passage 2.

レギュレータ３は、内部にダイヤフラム３２で区画された調圧室３０及び背圧室３１を有しており、調圧室３０は図示しない圧力容器から送出された高圧のガス燃料を導入する燃料導入孔３４を有しており、調圧室３０内部を所定圧力に保つように動作するダイヤフラム３２の変位により燃料導入孔３４部分に設けた弁体３３を開閉操作して、高圧のガス燃料を減圧気化させながら所望の圧力に調整する。   The regulator 3 includes a pressure regulating chamber 30 and a back pressure chamber 31 that are partitioned by a diaphragm 32 inside, and the pressure regulating chamber 30 introduces a high-pressure gas fuel sent from a pressure vessel (not shown). 34, the valve body 33 provided in the fuel introduction hole 34 is opened and closed by the displacement of the diaphragm 32 that operates to keep the inside of the pressure regulating chamber 30 at a predetermined pressure, and the high pressure gas fuel is vaporized under reduced pressure. And adjust to the desired pressure.

また、上述したようにエアクリーナ５の目詰まり時に対応するために、吸気通路２のエアクリーナ５下流側でミキサ４上流側部分が配管７で背圧室３１に接続されており、過剰な吸気負圧の影響によるオーバーリッチ化を回避するインナーベント方式を採用している。   Further, as described above, in order to cope with the clogging of the air cleaner 5, the upstream portion of the mixer 4 on the downstream side of the air cleaner 5 in the intake passage 2 is connected to the back pressure chamber 31 by the pipe 7. The inner vent method is used to avoid over-riching due to the effects of

そして、本実施の形態のガス燃料供給装置において、特に、レギュレータ３の背圧室３１に大気導入バルブ手段としてのバルブ機構６を接続したことで、エンジン高負荷運転時に背圧室３１側に適当量の大気を導入して吸気負圧の過剰分を減少させ、空燃比の安定性を確保することができる。   In the gas fuel supply apparatus according to the present embodiment, the valve mechanism 6 as the air introduction valve means is connected to the back pressure chamber 31 of the regulator 3 in particular, so that it is suitable for the back pressure chamber 31 side during high engine load operation. By introducing a sufficient amount of air, the excess intake negative pressure can be reduced to ensure the stability of the air-fuel ratio.

このバルブ機構６は、ほぼレギュレータに近似した構成を有しており、内部にダイヤフラム６２で仕切られた大気室６０と負圧導入室６１とを備えており、この大気室６０には大気側と連通させる大気孔６０ａが設けられ、所定のフィルタを介して大気室６０内に大気を導入する。   The valve mechanism 6 has a configuration almost similar to a regulator, and includes an atmospheric chamber 60 and a negative pressure introducing chamber 61 that are partitioned by a diaphragm 62 inside. An atmosphere hole 60a for communication is provided, and the atmosphere is introduced into the atmosphere chamber 60 through a predetermined filter.

そして、この大気室６０は出口孔６３ｃ部分から延設された配管８ａがレギュレータ３の背圧室３１と吸気通路２とを接続している配管７の途中に連結されたことで背圧室３１に接続されており、バルブ機構６の開弁動作に伴って背圧室３１側に大気を導入する。   The air chamber 60 is connected to the back pressure chamber 31 by connecting a pipe 8 a extending from the outlet hole 63 c in the middle of the pipe 7 connecting the back pressure chamber 31 of the regulator 3 and the intake passage 2. The air is introduced to the back pressure chamber 31 side with the valve opening operation of the valve mechanism 6.

一方、負圧導入室６１にも、大気室６０からの配管８ａ接続部の下流側で配管７に接続しており、配管７を介して吸気通路２の吸気負圧を導入するようになっている。また、ダイヤフラム６２の大気室６０側の面からは先端に弁体６３ａを有するニードルバルブ（弁ロッド）６３が大気室６０内を貫通するように突設され、大気室６０の出口孔６３ｃに設けた弁座６３ｂと弁体６３ａとで構成されるバルブ（弁）を、負圧導入室６１に吸気負圧の変動を導入してダイヤフラム６２を往復変位させることにより開閉制御する。   On the other hand, the negative pressure introduction chamber 61 is also connected to the pipe 7 on the downstream side of the pipe 8 a connection portion from the atmospheric chamber 60, and the intake negative pressure of the intake passage 2 is introduced through the pipe 7. Yes. Further, a needle valve (valve rod) 63 having a valve body 63a at its tip is projected from the surface of the diaphragm 62 on the atmosphere chamber 60 side so as to penetrate the atmosphere chamber 60 and is provided in the outlet hole 63c of the atmosphere chamber 60. The valve (valve) constituted by the valve seat 63b and the valve body 63a is controlled to open and close by reciprocating the diaphragm 62 by introducing the fluctuation of the intake negative pressure into the negative pressure introduction chamber 61.

即ち、エンジン高負荷運転時に吸気通路２の吸気負圧が増大することにより、調圧バネ６４の付勢力に抗して吸気導入室６１の体積が減少し、ダイヤフラム６２が変位してバルブ機構６が開弁し、これにより大気孔６０ａを介してレギュレータ３の背圧室３１側に大気を導入するものである。尚、図のように弁体６３ａの先端側にリーク孔６３ｄを設けておくことによりスムースな動作及び作用を確保しやすくなる。また、背圧室３１側に大気を導入することには、背圧室３１内に実際に大気を導入することのほか、背圧室３１に吸気負圧を作用させる配管７に大気を導入してその負圧を減少させることも含んでいる。   That is, the intake negative pressure in the intake passage 2 increases during engine high-load operation, so that the volume of the intake introduction chamber 61 decreases against the biasing force of the pressure adjusting spring 64, and the diaphragm 62 is displaced to displace the valve mechanism 6. Is opened, thereby introducing the atmosphere to the back pressure chamber 31 side of the regulator 3 through the atmosphere hole 60a. As shown in the figure, it is easy to ensure a smooth operation and action by providing a leak hole 63d on the distal end side of the valve body 63a. In addition to introducing the air into the back pressure chamber 31, the air is introduced into the pipe 7 that applies the intake negative pressure to the back pressure chamber 31. This includes reducing the negative pressure.

次に、本実施の形態のガス燃料供給装置による作用及び効果について、以下に詳細に説明する。   Next, the operation and effect of the gas fuel supply device of the present embodiment will be described in detail below.

エアクリーナ５の目詰まり時には、吸気通路２及び配管７の負圧が増大するが、これらの負圧が配管８ｂを介してバルブ機構６の負圧導入室６１に導入され、クリーナ５の目詰まりによる吸気負圧レベルに応じてバルブが開き、適当量の大気が配管８ａを介しレギュレータ３の背圧室３１側に導入される。これにより、吸気負圧の背圧室３１への影響を適宜調整しながら適正な燃料流量に修正することができ、オーバーリッチ化を有効に回避することができる。   When the air cleaner 5 is clogged, negative pressures in the intake passage 2 and the pipe 7 increase. However, these negative pressures are introduced into the negative pressure introduction chamber 61 of the valve mechanism 6 through the pipe 8b, and the cleaner 5 is clogged. The valve is opened according to the intake negative pressure level, and an appropriate amount of air is introduced into the back pressure chamber 31 side of the regulator 3 through the pipe 8a. As a result, the influence of the negative intake pressure on the back pressure chamber 31 can be adjusted appropriately to correct the fuel flow rate, and over-riching can be effectively avoided.

エンジン運転のアイドル時〜軽負荷時にはバルブ機構６は閉弁しているが、中負荷時〜高負荷時にかけては吸気通路２の負圧が増大して配管７から分岐した配管８ｂを介して負圧導入室６１に吸気負圧が作用して、バルブ機構６のダイヤフラム６２が調圧バネ６４の付勢力に抗して変位し、ニードルバルブ６３が牽引されることで開弁して出口孔６３ｃが開く。すると、調量された大気が配管８ａから配管７を介して導入されるため、レギュレータ３の背圧室３１に作用する過剰な吸気負圧を適度なレベルに減少させ、これにより適正な燃料流量を確保して供給燃料のリーン化を回避する。   The valve mechanism 6 is closed when the engine is idling to a light load. However, the negative pressure of the intake passage 2 is increased through a pipe 8b branched from the pipe 7 during a medium load to a high load. An intake negative pressure acts on the pressure introducing chamber 61, the diaphragm 62 of the valve mechanism 6 is displaced against the urging force of the pressure adjusting spring 64, and the needle valve 63 is pulled to open, thereby opening the outlet hole 63c. Opens. Then, since the metered atmosphere is introduced from the pipe 8a through the pipe 7, the excessive intake negative pressure acting on the back pressure chamber 31 of the regulator 3 is reduced to an appropriate level, whereby an appropriate fuel flow rate is obtained. To avoid lean fuel supply.

図２及び図３は、本実施の形態のガス燃料供給装置の作用を確認するための実験結果を示したものである。図２に示した図表の横軸はモード運転ナンバーを示しており、１はアイドル、２は３０６０ｒｐｍ１０％負荷、３は２５％負荷、４は５０％負荷、５は７５％負荷、６は１００％負荷、７は８６００ｒｐｍ１００％負荷を示している。また、縦軸の上から順に大気導入用バルブの開口面積（径換算）、ＣＯ濃度、エアクリーナ下流負圧、ベンチュリ負圧を示している。また、バラメータのパワーダウンレシオは、目詰まりの度合いを出力比で表したものである。   2 and 3 show experimental results for confirming the operation of the gas fuel supply apparatus of the present embodiment. The horizontal axis of the chart shown in FIG. 2 indicates the mode operation number, where 1 is idle, 2 is 3060 rpm 10% load, 3 is 25% load, 4 is 50% load, 5 is 75% load, and 6 is 100%. The load, 7 indicates 8600 rpm 100% load. Moreover, the opening area (diameter conversion), CO concentration, air cleaner downstream negative pressure, and venturi negative pressure of the air introduction valve are shown in order from the top of the vertical axis. Moreover, the power-down ratio of the parameter represents the degree of clogging as an output ratio.

この図表から、大気導入バルブ手段であるバルブ機構６を備えた本実施の形態のガス燃料供給装置は、パワーダウンレシオ−２０％の目詰まり時においても、ＣＯ濃度がほぼ一定を維持しており、空燃比が大きく変動していないことが分かる。また、エンジン運転の中・高負荷時においても同様であり、総ての条件において比較的良好なエンジン運転状態を維持可能であることが分かる。   From this chart, the gas fuel supply device of the present embodiment having the valve mechanism 6 as the air introduction valve means maintains the CO concentration almost constant even when the power down ratio is clogged at -20%. It can be seen that the air-fuel ratio does not vary greatly. The same applies to the middle / high load of engine operation, and it can be seen that a relatively good engine operation state can be maintained under all conditions.

これに対し、図３は同じ装置においてバルブ機構６の大気導入用バルブの開度をφ２．５の一定に固定して運転した場合の試験結果を示した図表であり、モード１〜３がリッチであり、モード５〜６がリーンであり、モード７がリーン運転負荷であった。この図表から、吸気負圧の変動に応じて大気導入用バルブの開度を調整した図２の場合と比べて、空燃比の安定性が充分に確保されていないことが分かる。   On the other hand, FIG. 3 is a chart showing test results when the opening of the air introduction valve of the valve mechanism 6 is fixed to a constant φ2.5 in the same device, and modes 1 to 3 are rich. Modes 5 to 6 were lean, and mode 7 was a lean operation load. From this chart, it can be seen that the stability of the air-fuel ratio is not sufficiently ensured as compared with the case of FIG. 2 in which the opening degree of the air introduction valve is adjusted according to the fluctuation of the intake negative pressure.

以上、述べたように、レギュレータでガス燃料を大気圧程度の圧力に減圧・気化しミキサから吸気管路に送出するガス燃料供給装置について、本発明により、あらゆる状況に対応して供給燃料の過剰な空燃比変動を回避し、エンジン運転状態を良好に維持できるようになった。   As described above, the gas fuel supply device that depressurizes and vaporizes the gas fuel to a pressure of about atmospheric pressure by the regulator and sends the gas fuel to the intake pipe from the mixer. The air-fuel ratio fluctuation can be avoided and the engine operating condition can be maintained well.

本発明における実施の形態のガス燃料供給装置を示す配置図。1 is a layout view showing a gas fuel supply apparatus according to an embodiment of the present invention. 図１のガス燃料供給装置の作用・効果を確認するための実験結果の図表。The graph of the experimental result for confirming the effect | action and effect of the gas fuel supply apparatus of FIG. 図１のガス燃料供給装置において、バルブ機構のバルブ開度を固定した場合の実験結果の図表。FIG. 3 is a chart of experimental results when the valve opening of the valve mechanism is fixed in the gas fuel supply apparatus of FIG. 1. 従来のガス燃料供給装置を示す配置図。The layout which shows the conventional gas fuel supply apparatus.

符号の説明Explanation of symbols

２ 吸気通路、 ３ レギュレータ、 ４ ミキサ、 ５ エアクリーナ、 ６ バルブ機構、 ７，８ａ，８ｂ 配管、 ３０ 調圧室、 ３１ 背圧室、 ３２，６２ ダイヤフラム、 ４０ 燃料ノズル、 ４１ ベンチュリ、 ６０ 大気室、 ６０ａ 大気孔、 ６１ 負圧導入室、 ６３ ニードルバルブ、 ６３ａ 弁体、 ６３ｂ 弁シート、 ６３ｃ 出口孔、 ６４ 調圧バネ
2 intake passage, 3 regulator, 4 mixer, 5 air cleaner, 6 valve mechanism, 7, 8a, 8b piping, 30 pressure regulating chamber, 31 back pressure chamber, 32, 62 diaphragm, 40 fuel nozzle, 41 venturi, 60 atmospheric chamber, 60a air hole, 61 negative pressure introducing chamber, 63 needle valve, 63a valve body, 63b valve seat, 63c outlet hole, 64 pressure regulating spring

Claims (3)

圧力容器に貯蔵させたガス燃料を所定の圧力に減圧・気化させるレギュレータ及び前記レギュレータにて調圧後のガス燃料をエンジンにおけるエアクリーナの下流に設けた吸気通路に送出するミキサを備え、前記吸気通路と前記レギュレータの背圧室とが配管で接続されたインナーベント式のガス燃料供給装置において、前記レギュレータの背圧室に大気導入バルブ手段が接続されており、この大気導入バルブ手段は大気孔を有して該大気孔への連通路に設けたバルブを吸気負圧が増大するに従って大きく開放して前記背圧室側に大気を導入することにより、エンジン運転の負荷状態に応じて前記背圧室側に導入する大気量を調整することにより前記背圧室にかかる負圧の過剰分を縮小させることを特徴とするエンジンのガス燃料供給装置。   A regulator for depressurizing and vaporizing the gas fuel stored in the pressure vessel to a predetermined pressure, and a mixer for sending the gas fuel adjusted by the regulator to an intake passage provided downstream of an air cleaner in the engine; And an air vent valve means connected to the back pressure chamber of the regulator, and the air introduction valve means has an air hole. The valve provided in the communication path to the atmosphere hole is opened widely as the intake negative pressure increases and the atmosphere is introduced into the back pressure chamber side, so that the back pressure is determined according to the load condition of the engine operation. A gas fuel supply device for an engine, wherein an excess amount of negative pressure applied to the back pressure chamber is reduced by adjusting an amount of air introduced into the chamber. 前記大気導入バルブ手段がダイヤフラムで区画された負圧導入室を有しているとともに、この負圧導入室が前記エアクリーナ下流の吸気通路に配管で接続されており、前記負圧導入室に吸気負圧を導入して前記ダイヤフラムを変位させることにより前記バルブを開閉させて大気導入量をコントロールすることを特徴とする請求項１に記載したエンジンのガス燃料供給装置。   The air introduction valve means has a negative pressure introduction chamber partitioned by a diaphragm, and the negative pressure introduction chamber is connected to an intake passage downstream of the air cleaner by a pipe, and the negative pressure introduction chamber is sucked into the negative pressure introduction chamber. 2. The gas fuel supply device for an engine according to claim 1, wherein the valve is opened and closed by introducing pressure to displace the diaphragm to control the amount of air introduced. 前記背圧室と吸気通路とを接続する配管の途中に、前記大気導入バルブ手段の負圧導入室と前記吸気通路とを接続するための配管が接続しているとともに、この接続位置の上流側に前記大気圧導入バルブ手段から前記背圧室に大気を導入させるための配管が接続されていることを特徴とする請求項２に記載したエンジンのガス燃料供給装置。
A pipe for connecting the negative pressure introduction chamber of the air introduction valve means and the intake passage is connected to the middle of the pipe connecting the back pressure chamber and the intake passage, and the upstream side of the connection position. 3. A gas fuel supply device for an engine according to claim 2, wherein a pipe for introducing air from said atmospheric pressure introduction valve means to said back pressure chamber is connected.
JP2007212609A 2007-08-17 2007-08-17 Gas fuel supply device of engine Pending JP2009047036A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007212609A JP2009047036A (en) 2007-08-17 2007-08-17 Gas fuel supply device of engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007212609A JP2009047036A (en) 2007-08-17 2007-08-17 Gas fuel supply device of engine

Publications (1)

Publication Number Publication Date
JP2009047036A true JP2009047036A (en) 2009-03-05

Family

ID=40499486

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007212609A Pending JP2009047036A (en) 2007-08-17 2007-08-17 Gas fuel supply device of engine

Country Status (1)

Country Link
JP (1) JP2009047036A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133186A (en) * 2011-11-29 2013-06-05 本田技研工业株式会社 Fuel supply system for gas engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59123651U (en) * 1983-02-07 1984-08-20 株式会社日本気化器製作所 vaporizer
JPS62117244U (en) * 1986-01-17 1987-07-25

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59123651U (en) * 1983-02-07 1984-08-20 株式会社日本気化器製作所 vaporizer
JPS62117244U (en) * 1986-01-17 1987-07-25

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133186A (en) * 2011-11-29 2013-06-05 本田技研工业株式会社 Fuel supply system for gas engine

Similar Documents

Publication Publication Date Title
CA2431327A1 (en) Natural gas fuel storage and supply system for vehicles
JP4424615B2 (en) Gas fuel supply device
US20100012101A1 (en) Fuel supply system for gas engine
US20100269796A1 (en) Regulator for gas engine and gaseous fuel supplying device
JP2009047036A (en) Gas fuel supply device of engine
US6145495A (en) Propane injection system for a diesel engine
US9989016B2 (en) Electronic controlled fuel enrichment system
US9334832B2 (en) Airflow enriching device
KR101465442B1 (en) Supply Apparatus of Gas Fuel Having Converging-Diverging Nozzle
JPS586056B2 (en) internal combustion engine carburetor
JP2008215125A (en) Fuel supply system for internal combustion engine
US20120110999A1 (en) Propane injection system
JP4767458B2 (en) Fuel supply device for internal combustion engine
JP2019015181A (en) Regulator for gas fuel supply
JP4543354B2 (en) Engine gas fuel supply device
JP2024037067A (en) Low-pressure regulator for gas fuel
JPH1182082A (en) Fuel supply system for engine
US11193436B2 (en) Evaporated fuel processing device
JP2010025522A (en) Emulsion fuel supply system
JP2004028012A (en) Diaphragm carburetor
JP2005233041A (en) Fuel supply device of liquefied gas
JP3818634B2 (en) LPG engine fuel supply system
JPH04179849A (en) Gas fuel injection device
JP2006322381A (en) Vaporizer
JPH075244Y2 (en) LPG supply device for engine

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100817

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20111026

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20111028

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20120302