JPH04171258A - Fuel supplier for gas engine - Google Patents
Fuel supplier for gas engineInfo
- Publication number
- JPH04171258A JPH04171258A JP29831890A JP29831890A JPH04171258A JP H04171258 A JPH04171258 A JP H04171258A JP 29831890 A JP29831890 A JP 29831890A JP 29831890 A JP29831890 A JP 29831890A JP H04171258 A JPH04171258 A JP H04171258A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- surge tank
- regulator
- flow rate
- passage
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 69
- 238000005192 partition Methods 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 abstract description 14
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Landscapes
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は気体燃料をエンジンに供給する装置、詳しくは
吸気路中の混合器のベンチュリ負圧に依存して燃料を供
給するにあたり、加減速時に適正な燃料供給が行なわれ
る機能を具えた装置に関するものである。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a device for supplying gaseous fuel to an engine, and more specifically, a device for supplying gaseous fuel to an engine, and more specifically, for supplying fuel depending on the venturi negative pressure of a mixer in an intake passage, acceleration and deceleration are performed. The present invention relates to a device that has a function that allows for proper fuel supply at certain times.
［従来の技術］
ＬＰＧ、ＬＮＧのような液化ガス燃料をベーパライザで
ガス化して得た気体燃料、或いはＣＮＧ、都市ガスのよ
うな気体燃料をレギュレータで大気圧よりも僅かに低い
所定の負圧に調整し、エンジンの吸気路中の混合器のベ
ンチュリ負圧に応じて吸引させ、且つその途中で主ジェ
ットにより流量を制御してエンジンに供給するシステム
は周知である。[Prior art] Gaseous fuel obtained by gasifying liquefied gas fuel such as LPG or LNG with a vaporizer, or gaseous fuel such as CNG or city gas, is brought to a predetermined negative pressure slightly lower than atmospheric pressure using a regulator. A system is well known in which the air is regulated and sucked in according to the venturi negative pressure of a mixer in the intake passage of the engine, and the flow rate is controlled by a main jet along the way and supplied to the engine.
このシステムにおいて、レギュレータ出口から主ジェッ
トに至る部分で気体燃料が一定圧力に維持されているこ
とが流量制御を適正に行なううえで好ましい。−力、混
合器の絞り弁が急速度で操作されるとき、即ちエンジン
の加減速時のような過渡運転時にベンチュリ負圧の変化
に対応する燃料流量の変化に対しレギュレータの応答が
遅れるため一定圧力が維持されなくなって流量制御を適
正に行なうことが不可能となり、その結果エンジンの排
気状態や運転性を劣化させる。In this system, it is preferable for the gaseous fuel to be maintained at a constant pressure from the regulator outlet to the main jet in order to properly control the flow rate. - constant when the mixer throttle valve is operated at a rapid rate, i.e. during transient operations such as during engine acceleration/deceleration, as the regulator's response to changes in fuel flow rate corresponding to changes in venturi negative pressure is delayed; Since the pressure is no longer maintained, it becomes impossible to properly control the flow rate, and as a result, the exhaust state and drivability of the engine deteriorate.
その対策として、第３図に示すようにレギュレータ５１
から混合器５２のベンチュリ５３に至る燃料通路５４の
レギュレータ５１と主ジェット５５との間にサージタン
ク５６を設置し、圧力変化をこのサージタンク５６によ
って吸収させることが試みられた。As a countermeasure, as shown in FIG.
Attempts have been made to install a surge tank 56 between the main jet 55 and the regulator 51 of the fuel passage 54 extending from the fuel passageway 54 to the venturi 53 of the mixer 52, and to have the surge tank 56 absorb pressure changes.
しかしながら、このサージタンク５６は加速時のような
燃料流量増加時に対応させるには大容量の方が好ましく
、減速時のような燃料流量減少時にレギュレータ５１の
応答遅れを小さくするには小容量の方が好ましい。従っ
て、加速燃料を適正に増量して供給するだけでなく、減
速時に燃料を適切に減量させるためには、定常運転時に
おけるレギュレータ５１のヒステレシスによる圧力変動
を吸収できる程度の容量に設定して要求される相反する
性質の両方に対応させな７ければならなかった。即ち、
加速時および減速時のいずれに対しても流量制御を適正
に行なわせる機能をサージタンク５６にもたせることは
できない。However, it is preferable that the surge tank 56 has a large capacity to cope with an increase in fuel flow rate such as during acceleration, and a small capacity to reduce the response delay of the regulator 51 when the fuel flow rate decreases such as during deceleration. is preferred. Therefore, in order to not only appropriately increase and supply acceleration fuel but also appropriately reduce fuel during deceleration, the required capacity should be set to an extent that can absorb pressure fluctuations due to hysteresis of the regulator 51 during steady operation. It was necessary to accommodate both of the conflicting characteristics of the project. That is,
The surge tank 56 cannot be provided with the function of properly controlling the flow rate both during acceleration and deceleration.
［発明が解決しようとする課題］
本発明が解決しようとする課題は、ベンチュリ負圧に応
じてレギュレータから気体燃料を吸引し混合器に送る際
に、過渡運転時の流量制御を適正に行なうことができな
い、という点である。即ち、本発明は加速時および減速
時のいずれに対しても流量制御を適正に行なうことがで
きる機構を具えたガスエンジンの燃料供給装置を提供し
ようとするものである。[Problem to be Solved by the Invention] The problem to be solved by the present invention is to appropriately control the flow rate during transient operation when sucking gaseous fuel from the regulator and sending it to the mixer according to the venturi negative pressure. The point is that it is not possible. That is, an object of the present invention is to provide a fuel supply system for a gas engine that is equipped with a mechanism that can properly control the flow rate both during acceleration and deceleration.
［課題を解決するための手段］
本発明は、レギュレータと混合器とこれらを接続した燃
料通路とを具えているガスエンジンのための燃料供給装
置がもっている前記課題を次の手段によって解決した。[Means for Solving the Problems] The present invention has solved the above-mentioned problems of a fuel supply device for a gas engine, which includes a regulator, a mixer, and a fuel passage connecting these, by the following means.
即ち、燃料通路のレギュレータと主ジェットとの間に第
一サージタンクを設置するとともに、レギュレータと第
一サージタンクとを第二サージタンクを設置した補助燃
料通路で接続し、二つのサージタンクを連通ずる連通路
を燃料流量の増加時に開き減少時に閉じるようにし尚、
二つのサージタンクを一つのハウジングに仕切壁によっ
て区画形成し、連通路を仕切壁に設けた通口で形成する
のがよい。また、連通路の開閉弁は吸気路の負圧信号に
より駆動する場合と、電子式制御器の電気信号により駆
動する場合とがある。That is, a first surge tank is installed between the regulator and the main jet in the fuel passage, and the regulator and the first surge tank are connected by an auxiliary fuel passage in which a second surge tank is installed, so that the two surge tanks are connected. The communicating path is opened when the fuel flow rate increases and closed when it decreases.
It is preferable that the two surge tanks are partitioned into one housing by a partition wall, and the communication path is formed by a port provided in the partition wall. Further, the opening/closing valve of the communication passage may be driven by a negative pressure signal of the intake passage, or may be driven by an electric signal from an electronic controller.
［作 用 ］
エンジンのアイドル時および低速時には開閉弁が閉弁し
て気体燃料を燃料通路のみにより供給する。加速時に開
閉弁が開弁して第二サージタンクの気体燃料を第一サー
ジタンクに導入し、燃料流量増加に対応させてレギュレ
ータの応答遅れによる圧力低下をなくす。また、減速時
に開閉弁が閉弁してベンチュリ負圧の低下を第一サージ
タンクを有する燃料通路のみによってレギュレータに伝
え応答遅れを小さくして燃料流量を減少させる。[Operation] When the engine is idling or at low speed, the on-off valve closes and gaseous fuel is supplied only through the fuel passage. During acceleration, the on-off valve opens and introduces gaseous fuel from the second surge tank into the first surge tank to correspond to the increase in fuel flow rate and eliminate pressure drop due to response delay of the regulator. Further, during deceleration, the on-off valve closes, and the decrease in venturi negative pressure is transmitted to the regulator only through the fuel passage having the first surge tank, reducing the response delay and reducing the fuel flow rate.
［実施例］ 図面を参照して本発明の詳細な説明する。[Example] The present invention will be described in detail with reference to the drawings.
第１図において、エアクリーナ１を通過した空気は混合
器２で気体燃料と混合し、吸気マニホルド３を通ってエ
ンジン４に供給される。−方、レギュレータ５で大気圧
よりも僅かに近い所定の負圧に調整された気体燃料は、
燃料通路６を通って混合器２のベンチュリ２１に送られ
、主ノズル２２からベンチュリ負圧に応じて吸気路２３
に吸出される。燃料通路６は気体燃料の流量制御を行な
う主ジェット６１を有し、その上流側に第一サージタン
ク７が設置されている。この第一サージタンク７は定常
運転時においてレギュレータ５のヒステレシスによる圧
力変動を吸収することが可能な最小限の大きさまたはこ
れよりも少し大きい小容量に作られる。In FIG. 1, air that has passed through an air cleaner 1 is mixed with gaseous fuel in a mixer 2, and is supplied to an engine 4 through an intake manifold 3. - On the other hand, the gaseous fuel adjusted to a predetermined negative pressure slightly closer to atmospheric pressure by the regulator 5 is
The fuel is sent to the venturi 21 of the mixer 2 through the fuel passage 6, and is sent from the main nozzle 22 to the intake passage 23 according to the venturi negative pressure.
is sucked out. The fuel passage 6 has a main jet 61 that controls the flow rate of gaseous fuel, and a first surge tank 7 is installed upstream thereof. The first surge tank 7 is made to have a minimum size that can absorb pressure fluctuations due to hysteresis of the regulator 5 during steady operation, or a small capacity slightly larger than this.
レギュレータ５と第一サージタンク７とは第二サージタ
ンク９を設置した補助燃料通路８によって接続されてい
る。この二つのサージタンク７．９は一つのハウジング
１０の内部に仕切壁１１により区画されて形成された一
体構造であり、これらを連通ずる連通路１２は仕切壁１
１に設けた通口によって形成されている。The regulator 5 and the first surge tank 7 are connected by an auxiliary fuel passage 8 in which a second surge tank 9 is installed. These two surge tanks 7.9 are integrally formed inside one housing 10 and partitioned by a partition wall 11, and the communication passage 12 that communicates them is formed by the partition wall 1.
It is formed by the opening provided in 1.
また、連通路１２を開閉する開閉弁１３はダイヤフラム
１４に取付けられて第二サージタンク９に配備され、ダ
イヤフラム１４の第二サージタンク９と反対側は負圧室
１５に面している。この負圧室１５は吸気路２３の絞り
弁２４のアイドル位置よりも少し上流であって開度増大
に伴い下流となる個所に負圧通路１６によって連通し、
且つダイヤフラム１４を第二サージタンク９の方へ付勢
する閉弁ばね１７が装入されている。Further, an on-off valve 13 for opening and closing the communication passage 12 is attached to a diaphragm 14 and disposed in the second surge tank 9, and the side of the diaphragm 14 opposite to the second surge tank 9 faces the negative pressure chamber 15. This negative pressure chamber 15 communicates with a portion of the intake passage 23 that is slightly upstream of the idle position of the throttle valve 24 and becomes downstream as the opening degree increases, through a negative pressure passage 16.
In addition, a valve closing spring 17 is installed which urges the diaphragm 14 toward the second surge tank 9.
このような構成の本実施例は、エンジン４のアイドル時
および絞り弁２４の開度が小さい低速時に負圧通路１６
が絞り弁２４の上流側の低い負圧を負圧室１５に導入し
ていることによって開閉弁１３が連通路１２を閉塞して
いる。このため、レギュレータ５で調整された気体燃料
は燃料通路６のみにより混合器２に送られ、第一サージ
タンク７は一定容量を維持してレギュレータ５の圧力変
動による圧力変化を吸収するのに有効に働く。In this embodiment having such a configuration, the negative pressure passage 16 is closed when the engine 4 is idling and at low speed when the opening degree of the throttle valve 24 is small.
The on-off valve 13 closes the communication passage 12 by introducing the low negative pressure upstream of the throttle valve 24 into the negative pressure chamber 15 . Therefore, the gaseous fuel regulated by the regulator 5 is sent to the mixer 2 only through the fuel passage 6, and the first surge tank 7 is effective in maintaining a constant capacity and absorbing pressure changes due to pressure fluctuations in the regulator 5. to work.
加速時に絞り弁２４が大きく開かれ負圧通路１６が絞り
弁２４の下流側の高い負圧を負圧室１５に導入するよう
になると、ダイヤフラム１４は負圧に吸引されて開閉弁
１３が連通路１２を開放する。このため、第二サージタ
ンク９の気体燃料が第一サージタンク７を通って混合器
２に送られ、加速運転による燃料流量増加に対応する燃
料を供給する。即ち、第二サージタンク９は第一サージ
タンク７の容積を増大させ、ベンチュリ負圧が高くなっ
たときのレギュレータ５の応答遅れによる圧力低下を補
償し、主ジェット６１による流量制御を適正に行なわせ
るのである。When the throttle valve 24 opens wide during acceleration and the negative pressure passage 16 introduces high negative pressure downstream of the throttle valve 24 into the negative pressure chamber 15, the diaphragm 14 is attracted to the negative pressure and the on-off valve 13 is connected. Open the passage 12. Therefore, the gaseous fuel in the second surge tank 9 is sent to the mixer 2 through the first surge tank 7 to supply fuel corresponding to the increase in fuel flow rate due to the accelerated operation. That is, the second surge tank 9 increases the volume of the first surge tank 7, compensates for the pressure drop due to the response delay of the regulator 5 when the venturi negative pressure becomes high, and properly controls the flow rate by the main jet 61. Let it happen.
絞り弁２４の開度がかなり大きくその下流側の負圧が負
圧室１５に導入されている状態の定常運転時においては
、エンジン４の負荷と絞り弁２４の開度とによって負圧
が異なる値となり、絞り弁２４の全開時には負荷に関係
なく負圧が低いことによって開閉弁１３は閉弁状態とな
るが、それ以外の開度域では負圧に応じて開閉弁１３は
閉弁または開弁のいずれかの状態となる。この運転域で
は燃料流量はかなり大きく精密な流量制御を必要としな
いので、第二サージタンク９が第一サージタンク７と連
通し且つこれらがレギュレータ５に接続されていてもエ
ンジン４の運転に悪影響を与えない。During steady operation when the opening degree of the throttle valve 24 is quite large and negative pressure on the downstream side is introduced into the negative pressure chamber 15, the negative pressure varies depending on the load of the engine 4 and the opening degree of the throttle valve 24. When the throttle valve 24 is fully open, the on-off valve 13 is closed due to low negative pressure regardless of the load, but in other opening ranges, the on-off valve 13 is closed or opened depending on the negative pressure. The valve will be in one of two states. In this operating range, the fuel flow rate is quite large and precise flow control is not required, so even if the second surge tank 9 communicates with the first surge tank 7 and they are connected to the regulator 5, the operation of the engine 4 will be adversely affected. not give.
減速時に絞り弁２４が閉じると、負圧室１５にその上流
側の低い負圧が導入されるので開閉弁１３は閉弁し、ベ
ンチュリ負圧の低下を第一サージタンク７を有する燃料
通路６のみによってレギュレータ５に伝達する。第一サ
ージタンク７の容量は小さいので、この圧力伝達の遅れ
は小さく、レギュレータ５の応答遅れを小さくして燃料
流量を減少させる。また、燃料通路６に残存する燃料は
比較的少量であるので、減速時に燃料流量を適切に減少
させるのに有利である。When the throttle valve 24 closes during deceleration, low negative pressure on the upstream side is introduced into the negative pressure chamber 15, so the on-off valve 13 closes and the decrease in venturi negative pressure is channeled into the fuel passage 6 having the first surge tank 7. The signal is transmitted to the regulator 5 only by the signal. Since the capacity of the first surge tank 7 is small, this delay in pressure transmission is small, which reduces the response delay of the regulator 5 and reduces the fuel flow rate. Furthermore, since the amount of fuel remaining in the fuel passage 6 is relatively small, it is advantageous to appropriately reduce the fuel flow rate during deceleration.
第２図は開閉弁１３を駆動する機構の異なる実施例を示
すものであって、開閉弁１３は電子式制御器１８から送
られる電気信号によって励磁するソレノイド１９のプラ
ンジャに結合されている。FIG. 2 shows a different embodiment of the mechanism for driving the on-off valve 13, in which the on-off valve 13 is connected to the plunger of a solenoid 19 which is energized by an electrical signal sent from an electronic controller 18.
電子式制御器１８には空気流量、絞り弁２４の開度、エ
ンジン４の回転速度などのエンジン運転状態や自動車の
場合は更にその車速か人力され、開閉弁１３を前記同様
に開弁または閉弁する電気信号を出力する。この実施例
では、加速時にのみ開閉弁１３を開弁し、それ以外は減
速時を含めて開閉弁１３を閉弁状態としておくことがで
きる。The electronic controller 18 is inputted with engine operating conditions such as the air flow rate, the opening degree of the throttle valve 24, the rotational speed of the engine 4, and in the case of a car, the vehicle speed, and is used to open or close the on-off valve 13 in the same manner as described above. Outputs an electrical signal to activate the valve. In this embodiment, the on-off valve 13 is opened only during acceleration, and can be kept closed at other times, including during deceleration.
［発明の効果 ］
本発明によると、燃料通路に設置した圧力吸収用のサー
ジタンクにもう一つのサージタンクを付設し、これらを
加速時に連通し減速時に遮断するという簡単な手段で過
渡運転時にレギュレータから混合器に吸引される気体燃
料の流量制御を適切に行ない、エンジンの排気状態や運
転性を良好ならしめることができる。[Effects of the Invention] According to the present invention, another surge tank is attached to the pressure absorption surge tank installed in the fuel passage, and the regulator is connected during transient operation by a simple method of communicating with the surge tank during acceleration and cutting off during deceleration. The flow rate of the gaseous fuel sucked into the mixer from the engine can be appropriately controlled, and the exhaust state and drivability of the engine can be improved.
第１図は本発明の実施例を示す配置図、第２図は本発明
の異なる実施例を示す部分図、第３図は従来例の配置図
である。FIG. 1 is a layout diagram showing an embodiment of the present invention, FIG. 2 is a partial diagram showing a different embodiment of the invention, and FIG. 3 is a layout diagram of a conventional example.
Claims (1)
気路に設置されベンチュリ負圧に応じて気体燃料が送ら
れる混合器と、流量制御用の主ジェットを有し前記レギ
ュレータから前記ベンチュリに至る燃料通路とからなる
ガスエンジンの燃料供給装置において； 前記燃料通路のレギュレータと主ジェットとの間に設置
された第一サージタンクと、前記レギュレータと第一サ
ージタンクとを接続した補助燃料通路と、前記補助燃料
通路に設置された第二サージタンクと、前記第二サージ
タンクと第一サージタンクとを連通する連通路を燃料流
量の増加時に開き減少時に閉じる開閉弁とを具えたこと
を特徴とする燃料供給装置。 ２、第一サージタンクと第二サージタンクとが一つのハ
ウジングに仕切壁により区画されて形成され、連通路が
前記仕切壁に設けた通口である請求項１記載のガスエン
ジンの燃料供給装置。 ３、開閉弁が吸気路の絞り弁アイドル位置よりも上流で
開度増大に伴い下流となる個所の負圧力によって駆動さ
れる請求項１記載のガスエンジンの燃料供給装置。 ４、開閉弁がエンジン運転状態に応じて電子式制御器か
ら送られる電気信号によって駆動されるガスエンジンの
燃料供給装置。[Claims] 1. The regulator has a regulator that adjusts the gaseous fuel to a predetermined pressure, a mixer installed in the intake passage and to which the gaseous fuel is sent in accordance with the venturi negative pressure, and a main jet for controlling the flow rate. A fuel supply system for a gas engine comprising a fuel passage extending from the venturi to the venturi; a first surge tank installed between the regulator of the fuel passage and the main jet; and a first surge tank connected to the regulator. An auxiliary fuel passage, a second surge tank installed in the auxiliary fuel passage, and an on-off valve that opens a communication passage that communicates the second surge tank and the first surge tank when the fuel flow rate increases and closes it when the fuel flow rate decreases. A fuel supply device characterized by: 2. The fuel supply system for a gas engine according to claim 1, wherein the first surge tank and the second surge tank are formed in one housing separated by a partition wall, and the communication passage is a port provided in the partition wall. . 3. The fuel supply system for a gas engine according to claim 1, wherein the on-off valve is driven by negative pressure at a location upstream of the throttle valve idle position in the intake passage and downstream as the opening degree increases. 4. A gas engine fuel supply system in which an on-off valve is driven by an electric signal sent from an electronic controller depending on the engine operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29831890A JPH04171258A (en) | 1990-11-02 | 1990-11-02 | Fuel supplier for gas engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29831890A JPH04171258A (en) | 1990-11-02 | 1990-11-02 | Fuel supplier for gas engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04171258A true JPH04171258A (en) | 1992-06-18 |
Family
ID=17858095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29831890A Pending JPH04171258A (en) | 1990-11-02 | 1990-11-02 | Fuel supplier for gas engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04171258A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06330773A (en) * | 1993-05-19 | 1994-11-29 | Tokyo Gas Co Ltd | Stabilizer for operation of gas engine |
| JPH06330774A (en) * | 1993-05-19 | 1994-11-29 | Tokyo Gas Co Ltd | Stabilizer for operation of gas engine |
| US6679232B2 (en) * | 2001-07-11 | 2004-01-20 | Honda Giken Kogyo Kabushiki Kaisha | Mixer for multicylinder gas engine |
| CN110392779A (en) * | 2017-03-30 | 2019-10-29 | 马自达汽车株式会社 | The getter device of multiple cylinder engine |
-
1990
- 1990-11-02 JP JP29831890A patent/JPH04171258A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06330773A (en) * | 1993-05-19 | 1994-11-29 | Tokyo Gas Co Ltd | Stabilizer for operation of gas engine |
| JPH06330774A (en) * | 1993-05-19 | 1994-11-29 | Tokyo Gas Co Ltd | Stabilizer for operation of gas engine |
| US6679232B2 (en) * | 2001-07-11 | 2004-01-20 | Honda Giken Kogyo Kabushiki Kaisha | Mixer for multicylinder gas engine |
| CN110392779A (en) * | 2017-03-30 | 2019-10-29 | 马自达汽车株式会社 | The getter device of multiple cylinder engine |
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