JPS6065261A - Fuel feeder for internal-combustion engine using liquidized petroleum gas - Google Patents
Fuel feeder for internal-combustion engine using liquidized petroleum gasInfo
- Publication number
- JPS6065261A JPS6065261A JP58173058A JP17305883A JPS6065261A JP S6065261 A JPS6065261 A JP S6065261A JP 58173058 A JP58173058 A JP 58173058A JP 17305883 A JP17305883 A JP 17305883A JP S6065261 A JPS6065261 A JP S6065261A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- injection valve
- fuel injection
- valve
- combustion engine
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/026—Measuring or estimating parameters related to the fuel supply system
- F02D19/027—Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0209—Hydrocarbon fuels, e.g. methane or acetylene
- F02M21/0212—Hydrocarbon fuels, e.g. methane or acetylene comprising at least 3 C-Atoms, e.g. liquefied petroleum gas [LPG], propane or butane
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0278—Port fuel injectors for single or multipoint injection into the air intake system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は液化石油ガス（以下Ｉ、ＰＧと略称する）内燃
機関用燃料供給装置に係り、特に燃料噴射弁金偏え、こ
の燃料噴射弁の開弁時間によって内燃機関への燃料供給
量を制御するようにしたＬ Ｐ Ｇ内燃機関用燃料供給
装置の改良に関するものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a fuel supply system for a liquefied petroleum gas (hereinafter abbreviated as I, PG) internal combustion engine, and particularly to a fuel injection valve misalignment, The present invention relates to an improvement of a fuel supply device for an LPG internal combustion engine that controls the amount of fuel supplied to the internal combustion engine based on the valve opening time.
自動車用Ｔ、ＰＧ内燃機関の燃料供給装置としては、Ｌ
ＰＧボンベの燃料飽和蒸気圧力、すなわち、燃料圧力に
よって液状のＬＰＧ燃料をベーパライザーに送シ、蒸発
、調圧して一定圧力の気体状のＬＰＧ燃料としてミキサ
ーに供給する方式としたのが一般的である。As a fuel supply system for automobile T and PG internal combustion engines, L
The general method is to send liquid LPG fuel to a vaporizer, evaporate it, adjust the pressure, and supply it to the mixer as gaseous LPG fuel at a constant pressure, depending on the fuel saturated vapor pressure of the PG cylinder, that is, the fuel pressure. be.
しかし、近年、特開昭５３−１４１８３１号公報にある
ようガガソリン噴射装置と同様にＴ、 Ｐ Ｇ内燃機関
の高出力化、高効率化を目的として、液状のＬＰＧ燃料
を燃料噴射弁の開弁時間によって計量するようにした燃
料供給装置が検討畑れている。However, in recent years, as described in Japanese Patent Application Laid-Open No. 53-141831, liquid LPG fuel is being used to open the fuel injection valve for the purpose of increasing the output and efficiency of T and PG internal combustion engines, similar to the gasoline injection device. A fuel supply system that measures fuel by time is currently being considered.
この燃料噴射弁を用いた燃料供給装置においても、燃料
飽和蒸気圧のみによって燃料を圧送することが可能であ
るが、このようにすると下記のような不具合を生ずる。Even in a fuel supply system using this fuel injection valve, it is possible to pump fuel only by the fuel saturated vapor pressure, but if this is done, the following problems occur.
第１に、燃料噴射弁の開弁時間によって燃料供給量全正
確に制御するためには、燃料噴射弁に供給される燃料が
気泡の混っていない液状の燃料であることが必要であ条
が、発明者がこのような燃料供給装置の動作を観察した
結果によれば、ＬＰＧボンベから供給される燃料は完全
な液状ではなく、燃料の気化による気泡が混入している
ことが確認された。第２に、―動車用内燃機関に供給さ
れるＬＰＧ燃料は、燃料組成、周囲温度によって飽和蒸
気圧が大きく変化するため、燃料計量のための燃料噴射
弁の開弁時間の燃圧による補正を広い範囲で行なわなけ
ればならず（同一開弁時間内の燃料噴射量の燃圧の平方
根に比例する）、このため、燃料噴射弁を備えた燃料供
給装置では、ＬＰＧボンベから燃料噴射弁へ送る燃料全
一定圧力に加圧する燃料ポンプが必要になる。しかし、
ＬＰＧボンベからの燃料を燃料ポンプによって加圧して
燃料噴射弁へ供給するようにした場合には、燃料ポンプ
の直前の上流側では燃料が吹い込まれるため、圧力の微
少な低下を招いて気泡を発生し、気泡が順次増大してポ
ンプ効率の低下をきたし、燃料ポンプ下流側でも圧力が
低下して気泡が発生し、燃料が供給されなくなつ゛ て
エンスト：に至るという問題を生ずる。First, in order to accurately control the total amount of fuel supplied by the valve opening time of the fuel injection valve, it is necessary that the fuel supplied to the fuel injection valve be liquid fuel without air bubbles. However, according to the results of the inventor's observation of the operation of such a fuel supply device, it was confirmed that the fuel supplied from the LPG cylinder is not completely liquid, but contains air bubbles due to fuel vaporization. . Second, the saturated vapor pressure of LPG fuel supplied to internal combustion engines for automobiles varies greatly depending on the fuel composition and ambient temperature. (proportional to the square root of the fuel pressure of the fuel injection amount within the same valve opening time), and for this reason, in a fuel supply system equipped with a fuel injection valve, all of the fuel sent from the LPG cylinder to the fuel injection valve must be A fuel pump that pressurizes to a constant pressure is required. but,
When fuel from an LPG cylinder is pressurized by a fuel pump and supplied to the fuel injection valve, the fuel is injected immediately upstream of the fuel pump, causing a slight drop in pressure and causing air bubbles. This causes a problem in that the pressure decreases on the downstream side of the fuel pump and bubbles are generated, resulting in fuel not being supplied and engine stalling.
第１図は燃料ポンプを設けた場合の気泡による燃料供給
系の閉止による燃料圧力およびそれにともなうエンジン
回転数の変化の袂態を示す線図で、（ａ）は燃料圧力、
（ｂ）はエンジン回転数の変化を示す。Fig. 1 is a diagram showing the changes in fuel pressure and engine speed caused by the closure of the fuel supply system due to bubbles when a fuel pump is installed; (a) shows the fuel pressure;
(b) shows the change in engine speed.
本発明は上記に鑑みてなされたもので、その目・的とす
るところは、燃料噴射弁に供給される液化石油ガス燃料
を気泡を含まない液状の燃料とすることができる液化石
油ガス内燃機関用燃料供給装置を提供することにある。The present invention has been made in view of the above, and its object/target is a liquefied petroleum gas internal combustion engine capable of converting the liquefied petroleum gas fuel supplied to the fuel injection valve into a liquid fuel that does not contain air bubbles. An object of the present invention is to provide a fuel supply device for
□ 〔発明の概要〕
本発明の特徴は、液化石油ガスボンベの液体燃料取出口
と燃料噴射弁との間に燃料ポンプを設けるとともに、上
記燃料ポンプから上記燃料噴射弁に供給される燃料の一
部を上記液化石油ガスポンベの気相側に戻す燃料リター
ン通路を設けた構成とした点にある。□ [Summary of the Invention] The present invention is characterized in that a fuel pump is provided between the liquid fuel outlet of the liquefied petroleum gas cylinder and the fuel injection valve, and a portion of the fuel supplied from the fuel pump to the fuel injection valve is The present invention is characterized in that a fuel return passage is provided for returning fuel to the gas phase side of the liquefied petroleum gas pump.
以下本発明を第２図、第４図に示した実施例および第３
図を用いて詳細に説明する。Embodiments of the present invention shown in FIGS. 2 and 4 and 3.
This will be explained in detail using figures.
第２図は本発明の燃料供給装置の一実施例を示す全体構
成図である。第゛２図において、１は内燃機関本体で、
内燃機関本体１には吸気管２を経て空気・燃料混合気を
供給する。スロットルチャンバー３が設けである。スロ
ットルチャンバ、−３には上記混合気の供給量を制御す
るスロットルバルブ４が設けてあり、このス・口、ット
ルバルプ４の下流側または上流側に本発明に係る燃料供
給装置の燃料噴射弁５が取り付けである・。本発明に係
る燃料供給装置の燃料供給系は、ＬＰＧボンベ６、燃料
ポンプ７、燃料溜８、電磁弁９、燃料噴射弁５とより構
成してあり、ざらに、燃料噴射弁５から絞り１０．電磁
弁１１、リターン通路１２を経てＬＰＧボンベ６の気相
側に至る燃料リターン通路が設けてあｐ、ＬＰＧボンベ
６からの燃料は燃料噴射弁５からスロットルチャンバー
３内に噴射され、一部は絞り１０、電磁弁、１１．９タ
一ン通路１２を経てＬ Ｐ Ｇボンベ６の気相側へ送り
返されるようにしである。一方、吸気管２には吸入負圧
を電気的に検出する吸入負圧センサ１３が設けてあり、
また、ディストリビュータ−等にエンジン回転数を検出
する回転センサ１４が設けてあり、また、燃料溜８には
１、燃料の圧力を電気的に検出する圧力センサ１５と燃
料温度ラミ気的に検出するサーミスタなどよりなる温度
センサ１６とが設けてあり、各センサ１３〜１６からの
電気信号は電子制御装置１７ＩＩＣ入力させておる。電
子制御装置１７は、センサ１３〜１６からの電気信号で
る、アナログ信号をディジタル信号に変換するＡ−Ｄ変
換器１８と、Ａ−Ｄ変換器１８からの信号を処理して燃
料噴射弁５の開弁時間等を演算するＣＰＵ１９およびＣ
ＰＵＩＩからの出力によって燃料噴射弁５の開弁制御を
行う燃料噴射弁駆動回路２０などから構成してあシ、燃
料噴射弁５の開弁時間を制御することによって内燃機関
１に供給する燃料量を制御する。ようにしである。FIG. 2 is an overall configuration diagram showing an embodiment of the fuel supply device of the present invention. In Fig. 2, 1 is the internal combustion engine main body;
An air/fuel mixture is supplied to the internal combustion engine main body 1 through an intake pipe 2. A throttle chamber 3 is provided. The throttle chamber -3 is provided with a throttle valve 4 for controlling the supply amount of the air-fuel mixture, and a fuel injection valve 5 of the fuel supply system according to the present invention is installed on the downstream or upstream side of the throttle valve 4. is the installation. The fuel supply system of the fuel supply device according to the present invention is composed of an LPG cylinder 6, a fuel pump 7, a fuel reservoir 8, a solenoid valve 9, and a fuel injection valve 5. ．． A fuel return passage leading to the gas phase side of the LPG cylinder 6 via the solenoid valve 11 and the return passage 12 is provided, and the fuel from the LPG cylinder 6 is injected into the throttle chamber 3 from the fuel injection valve 5, and a portion The gas is sent back to the gas phase side of the LPG cylinder 6 via a throttle 10, a solenoid valve, and a 11.9-tube passage 12. On the other hand, the intake pipe 2 is provided with an intake negative pressure sensor 13 that electrically detects intake negative pressure.
Further, a rotation sensor 14 for detecting the engine speed is provided at the distributor etc., and a pressure sensor 15 for electrically detecting the fuel pressure and a pressure sensor 15 for detecting the fuel temperature electrically are provided in the fuel reservoir 8. A temperature sensor 16 made of a thermistor or the like is provided, and electrical signals from each sensor 13 to 16 are inputted to an electronic control unit 17IIC. The electronic control device 17 includes an A-D converter 18 that converts analog signals, which are electrical signals from the sensors 13 to 16, into digital signals, and an A-D converter 18 that processes the signals from the A-D converter 18 to control the fuel injection valve 5. CPU 19 and C that calculate valve opening time, etc.
The fuel injection valve drive circuit 20 controls the opening of the fuel injection valve 5 based on the output from the PUII, and controls the amount of fuel supplied to the internal combustion engine 1 by controlling the opening time of the fuel injection valve 5. control. That's how it is.
次に、以上の構成の燃料供給装置の動作について説明す
る。内燃機関１の停止時には、電磁弁９と１１とは閉止
されている。そして、ＬＰＧボンベ６内の液体燃料は燃
料ポンプ７を通り、燃料溜８に至り、これらは液体燃料
で満されている。ただし、燃料噴射弁５には燃料が供給
されていない。Next, the operation of the fuel supply device having the above configuration will be explained. When the internal combustion engine 1 is stopped, the solenoid valves 9 and 11 are closed. The liquid fuel in the LPG cylinder 6 passes through a fuel pump 7 and reaches a fuel reservoir 8, which is filled with liquid fuel. However, fuel is not supplied to the fuel injection valve 5.
ここで、内燃機関キースイッチがオンの状態になると、
電磁弁９．１１が開弁し、同時に燃料ポンプ７が駆動き
れ、液状のＬＰＧ燃料が燃料噴射弁５に供給され、燃料
噴射弁５付近の燃料の気化による気泡は、絞り１０、電
磁弁１１、リターン通路１２全通ってＬＰＧボンベ６の
気相側に戻される。したがって、燃料噴射弁５には、気
泡を含まない液状の燃料のみが供給される。しかも、燃
料リターン通路には絞り１０が設けであるので、燃料ポ
ンプ７から絞シ１０までの間の燃料圧力は、ＬＰＧボン
ベ６内の燃料圧力より高くなっており、燃料中に気泡を
発生するのが抑制される。Here, when the internal combustion engine key switch is turned on,
The solenoid valves 9 and 11 open, and at the same time the fuel pump 7 is fully driven, liquid LPG fuel is supplied to the fuel injection valve 5, and air bubbles due to fuel vaporization near the fuel injection valve 5 are removed by the throttle 10 and the solenoid valve 11. , and is returned to the gas phase side of the LPG cylinder 6 through the entire return passage 12. Therefore, the fuel injection valve 5 is supplied with only liquid fuel that does not contain bubbles. Moreover, since the fuel return passage is provided with a throttle 10, the fuel pressure between the fuel pump 7 and the throttle 10 is higher than the fuel pressure in the LPG cylinder 6, which causes bubbles to be generated in the fuel. is suppressed.
次に、燃料リターン通路に設けた絞り１０の大きさと燃
料ポンプ７による燃料加圧との関係について説明する。Next, the relationship between the size of the throttle 10 provided in the fuel return passage and the fuel pressurization by the fuel pump 7 will be explained.
第３図は第２図の絞り１００太きさと燃料噴射弁５の直
前の上流側の燃料圧力との関係の実験結果を示す線図で
、図の破線ａは燃料ポンプ７による加圧力を示し、実線
すは実際の燃料圧力を示す。図に示すように、絞シ１０
の内径が零、すなわち、燃料リターン通路閉鎖のときは
、燃料ポンプ７による燃料の加圧が行われず、燃料噴射
弁５に完全に液状の燃料を送ることができない。最大加
圧効果は、絞シ１０の内径が０．６〜１．０ｍｍの間に
あり、これよシ絞シ１０の内径が大きいと加圧効果が減
少する。上記のように、燃料ポンプ７による加圧効果を
得るためには、ポンプ容量等により適当な絞り径を選択
する必要がある。FIG. 3 is a diagram showing the experimental results of the relationship between the orifice size 100 in FIG. , the solid line indicates the actual fuel pressure. As shown in the figure, the diaphragm 10
When the inner diameter of the fuel return passage is zero, that is, when the fuel return passage is closed, the fuel pump 7 does not pressurize the fuel, and liquid fuel cannot be completely delivered to the fuel injection valve 5. The maximum pressurizing effect is achieved when the inner diameter of the diaphragm 10 is between 0.6 and 1.0 mm, and as the inner diameter of the diaphragm 10 becomes larger than this, the pressurizing effect decreases. As mentioned above, in order to obtain the pressurizing effect by the fuel pump 7, it is necessary to select an appropriate orifice diameter depending on the pump capacity and the like.
上記した本発明の実施例によれば、ＬＰＧの燃料組成や
周囲温度に関係なく、常に燃料ポンプ７によ多燃料噴射
弁５に気泡を含まない液状の燃料を供給することができ
、正確な燃料流量制御を行うことができる。According to the embodiment of the present invention described above, the fuel pump 7 can always supply bubble-free liquid fuel to the multi-fuel injection valve 5 regardless of the LPG fuel composition or the ambient temperature. Fuel flow rate control can be performed.
第４図は第２図の絞シ１０の他の実施例を示す断面図で
ある。第２図においては、絞りｌＯをあらかじめ選定し
た内径の固定絞９としであるが、第４図においては、こ
れを可変絞りとしである。FIG. 4 is a sectional view showing another embodiment of the diaphragm 10 shown in FIG. In FIG. 2, the aperture lO is a fixed aperture 9 with a preselected inner diameter, but in FIG. 4, it is a variable aperture.
第４図において、１０ａは固定ジェットで、固定ジェノ
）１０ａは、最大加圧効果が得られる第３図に併記した
内径ｄｌに設定しである。１０ｂソレノイド側ジエツト
で、ソレノイド２１により開閉きれるようにしである。In FIG. 4, 10a is a fixed jet, and the fixed jet (10a) is set to the inner diameter dl shown in FIG. 3 to obtain the maximum pressurizing effect. 10b is a solenoid side jet that can be opened and closed by a solenoid 21.
ソレノイド側ジェット１０ｂの内径は、ソレノイド側ジ
ェット１０ｂが開弁の状態のときに固定ジェノ）１０ａ
との合計の等側内径が第３図に併記した内径ｄ２となる
ように設定しである。なお、ソレノイド側ジェット１０
ｂは図示のように固定ジェノ）１０ａのバイパス流路に
設けである。The inner diameter of the solenoid side jet 10b is fixed when the solenoid side jet 10b is in the open state.
The total equal-side inner diameter of the inner diameter is set to be the inner diameter d2 shown in FIG. 3. In addition, the solenoid side jet 10
b is provided in the bypass flow path of the fixed generator 10a as shown in the figure.
ＬＰＧは燃料組成および温度により飽和蒸気圧が大きく
変化し、自動車用燃料として使用されるＬＰＧも飽和蒸
気圧、すなわち、燃料圧力が一般にθ〜２０Ｋｇ／ｃｍ
２も変化するため、圧力制御なしでは、燃料流量制御が
不可能である。したがって、第２図の絞り１０として第
４図に示す構成の絞シを用い、燃料圧力がある一定値以
上のときは、ソレノイド２１によりソレノイド側ジェッ
ト１０ｂ全開キ、第２図の燃料ポンプ７の加圧効果を減
少させるようにすればこれにより燃料噴射弁５での燃料
圧力の変化幅を小さくできる。The saturated vapor pressure of LPG varies greatly depending on the fuel composition and temperature, and the LPG used as automobile fuel also has a saturated vapor pressure, that is, the fuel pressure generally ranges from θ to 20 Kg/cm.
2 also changes, so fuel flow rate control is impossible without pressure control. Therefore, when a throttle having the configuration shown in FIG. 4 is used as the throttle 10 in FIG. By reducing the pressurizing effect, the range of change in fuel pressure at the fuel injection valve 5 can be reduced.
以上説明したように、本発明によれば、燃料噴射弁に供
給される液化石油ガス燃料を気泡を含まない液状の燃料
とすることができ、正確な燃料流量制御を行うことがで
きるという効果がある。As explained above, according to the present invention, the liquefied petroleum gas fuel supplied to the fuel injection valve can be made into a liquid fuel that does not contain air bubbles, and the fuel flow rate can be accurately controlled. be.
第１図は燃料ポンプを設けた場合の気泡による燃料供給
系の閉止による燃料圧力およびエンジン回転数の変化を
示す線図、第２図は本発明のＬＰＧ内燃機関用燃料供給
装置の一実施例を示す全体構成図、第３図は第２図の絞
りの大きさと燃料噴射弁の直前の上流側の燃料圧力との
関係の実験結果を示す線図、第４図は第２図の絞りの他
の実施例を示す断面図である。
５・・・燃料噴射弁、６・・・ＬＰＧポンベ、７・・・
燃料ポンプ、８・・・燃料溜、９．１１・・・電磁弁、
１０・・・絞り、１２・・・リターン通路、１３・・・
吸入管圧力センサ、１４・・・回転数センサ、１５・・
・圧力センサ、１６・・・温度センサ、１７・・・電子
式制御装置。
代理人 弁理士 高橋明夫
め １ＦｉＪ
（α）
ａ＋ Ｐｅ’ｆ （ｓｅｃ ）
第 ２ 層 ・
１３図
糸交り／１Ｆ９イ仝（−ｙｐｒ列）Fig. 1 is a diagram showing changes in fuel pressure and engine speed due to closure of the fuel supply system by bubbles when a fuel pump is provided, and Fig. 2 is an embodiment of the fuel supply system for an LPG internal combustion engine of the present invention. Fig. 3 is a diagram showing the experimental results of the relationship between the size of the orifice shown in Fig. 2 and the fuel pressure on the upstream side immediately before the fuel injection valve, and Fig. 4 is a diagram showing the relationship between the size of the orifice shown in Fig. FIG. 7 is a sectional view showing another embodiment. 5...Fuel injection valve, 6...LPG pump, 7...
Fuel pump, 8... Fuel reservoir, 9.11... Solenoid valve,
10... Aperture, 12... Return passage, 13...
Suction pipe pressure sensor, 14... Rotation speed sensor, 15...
- Pressure sensor, 16... Temperature sensor, 17... Electronic control device. Agent Patent Attorney Akio Takahashi 1FiJ (α) a+ Pe'f (sec) 2nd layer ・Figure 13 Thread crossing / 1F9 I (-ypr column)
Claims (1)
して内燃機関に供給する液化石油ガス燃料の供給量を制
御するようにしたものにおいて、液化石油ガスボンベの
液体燃料取出口と前記燃料噴射弁との間に燃料ポンプを
設けるとともに、前記燃料ポンプから前記燃料噴射弁に
供給される燃料の一部を前記液化石油ガスボンベの気相
側に戻す燃料リターン通路を設けた構成としであること
を特徴とする液化石油ガス内燃機関用燃料供給装置。 ２、前記燃料リターン通路には絞シを設けである特許請
求の範囲第１項記載の液化石油ガス内燃機関用燃料供給
装置。[Scope of Claims] 1. A fuel injection valve that is equipped with a fuel injection valve and that controls the opening time of the fuel injection valve to control the amount of liquefied petroleum gas fuel supplied to an internal combustion engine, a fuel pump is provided between the liquid fuel outlet and the fuel injection valve, and a fuel return passage returns a part of the fuel supplied from the fuel pump to the fuel injection valve to the gas phase side of the liquefied petroleum gas cylinder. 1. A fuel supply device for a liquefied petroleum gas internal combustion engine, characterized in that it has a configuration. 2. The fuel supply device for a liquefied petroleum gas internal combustion engine according to claim 1, wherein the fuel return passage is provided with a restriction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58173058A JPS6065261A (en) | 1983-09-21 | 1983-09-21 | Fuel feeder for internal-combustion engine using liquidized petroleum gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58173058A JPS6065261A (en) | 1983-09-21 | 1983-09-21 | Fuel feeder for internal-combustion engine using liquidized petroleum gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6065261A true JPS6065261A (en) | 1985-04-15 |
| JPH0250311B2 JPH0250311B2 (en) | 1990-11-01 |
Family
ID=15953434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58173058A Granted JPS6065261A (en) | 1983-09-21 | 1983-09-21 | Fuel feeder for internal-combustion engine using liquidized petroleum gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6065261A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0558592A1 (en) * | 1990-11-20 | 1993-09-08 | The Energy Research And Development Corporation | A method of fuel injection |
| US5775281A (en) * | 1994-06-21 | 1998-07-07 | The Energy Research And Development Corporation | Determination of heat soak conditions |
| US7182073B1 (en) | 2005-08-30 | 2007-02-27 | Hyundai Motor Company | LPI engine system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58148256A (en) * | 1982-02-11 | 1983-09-03 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Method of supplying internal combustion engine with fuel and fuel feeder executing said method |
-
1983
- 1983-09-21 JP JP58173058A patent/JPS6065261A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58148256A (en) * | 1982-02-11 | 1983-09-03 | ロ−ベルト・ボツシユ・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング | Method of supplying internal combustion engine with fuel and fuel feeder executing said method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0558592A1 (en) * | 1990-11-20 | 1993-09-08 | The Energy Research And Development Corporation | A method of fuel injection |
| EP0558592B1 (en) * | 1990-11-20 | 1999-02-03 | The Energy Research And Development Corporation | A method and a system for fuel injection |
| US5775281A (en) * | 1994-06-21 | 1998-07-07 | The Energy Research And Development Corporation | Determination of heat soak conditions |
| US7182073B1 (en) | 2005-08-30 | 2007-02-27 | Hyundai Motor Company | LPI engine system |
| AU2006201756B2 (en) * | 2005-08-30 | 2007-11-01 | Hyundai Motor Company | LPI Engine System |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0250311B2 (en) | 1990-11-01 |
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