JPH0250311B2 - - Google Patents
Info
- Publication number
- JPH0250311B2 JPH0250311B2 JP58173058A JP17305883A JPH0250311B2 JP H0250311 B2 JPH0250311 B2 JP H0250311B2 JP 58173058 A JP58173058 A JP 58173058A JP 17305883 A JP17305883 A JP 17305883A JP H0250311 B2 JPH0250311 B2 JP H0250311B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- injection valve
- fuel injection
- pressure
- pump
- 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.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 claims description 155
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 35
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000003502 gasoline Substances 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
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
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LPG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
を備え、この燃料噴射弁の開弁時間によつて内燃
機関への燃料供給量を制御するようにしたLPG
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 liquefied petroleum gas (hereinafter abbreviated as LPG)
LPG, which relates to a fuel supply system for an internal combustion engine, and in particular is equipped with a fuel injection valve and controls the amount of fuel supplied to the internal combustion engine by the opening time of the fuel injection valve.
This invention relates to improvements in fuel supply devices for internal combustion engines.
〔発明の背景〕
自動車用LPG内燃機関の燃料供給装置として
は、LPGボンベの燃料飽和蒸気圧力、すなわち、
燃料圧力によつて液状のLPG燃料をベーパラザ
ーに送り、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。[Background of the Invention] As a fuel supply system for an automobile LPG internal combustion engine, the fuel saturated vapor pressure of an LPG cylinder, that is,
Depending on the fuel pressure, liquid LPG fuel is sent to the vaporizer, which evaporates and adjusts the pressure to produce gaseous fuel at a constant pressure.
Generally, it is supplied to the mixer as LPG fuel.
しかし、近年、特開昭53―141831号公報にある
ようなガソリン噴射装置と同様にLPG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つて計量
するようにした燃料供給装置が検討されている。 However, in recent years, similar to the gasoline injection device disclosed in Japanese Patent Application Laid-Open No. 53-141831, in order to increase the output and efficiency of LPG internal combustion engines, liquid
A fuel supply system that measures LPG fuel based on the opening time of a fuel injection valve is 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つて燃料を圧送する
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。第１に、燃料噴射弁の開弁
時間によつて燃料供給量を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つて
いない液状の燃料であることが必要であるが、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、自動車
用内燃機関に供給されるLPG燃料は、燃料組成、
周囲温度によつ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
る燃料を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
ンプによつ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。 Even in a fuel supply system using this fuel injection valve, it is possible to forcefully feed fuel using only the fuel saturated vapor pressure, but if this is done, the following problems occur. First, in order to accurately control the amount of fuel supplied by the valve opening time of the fuel injection valve, the fuel supplied to the fuel injection valve must 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. Ta. Second, the LPG fuel supplied to automotive internal combustion engines has a fuel composition,
Since the saturated vapor pressure varies greatly depending on the ambient temperature, the opening time of the fuel injection valve for fuel metering must be corrected by the fuel pressure over a wide range (the amount of fuel injected within the same valve opening time must be adjusted). Therefore, in a fuel supply system equipped with a fuel injection valve, a fuel pump is required to pressurize the fuel sent from the LPG cylinder to the fuel injection valve to a constant pressure. However, when the fuel from the LPG cylinder is pressurized by a fuel pump and supplied to the fuel injection valve, the fuel is injected into the upstream side immediately before the fuel pump, so a slight drop in pressure is prevented. This causes air bubbles to be generated, and the air bubbles gradually increase, resulting in a decrease in pump efficiency.The pressure also decreases on the downstream side of the fuel pump, causing air bubbles to be generated, resulting in a problem in which fuel is no longer supplied and the engine stalls.
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状態を示す線図
で、(a)は燃料圧力、(b)はエンジン回転数の変化を
示す。 Figure 1 is a diagram showing the changes in fuel pressure and engine speed caused by the closure of the fuel supply system due to air bubbles when a fuel pump is installed. (a) shows the fuel pressure, and (b) shows the engine speed. Indicates a change in number.
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 an object of the present invention is to provide a liquefied petroleum gas fuel for an internal combustion engine that can turn the liquefied petroleum gas fuel supplied to the fuel injection valve into a liquid fuel that does not contain air bubbles. The purpose is to provide a supply device.
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
とした点にある。
A feature of the present invention is that a fuel pump is provided between the liquid fuel outlet of the liquefied petroleum gas cylinder and the fuel injection valve, and a part of the fuel supplied from the fuel pump to the fuel injection valve is transferred to the liquefied petroleum gas cylinder. The main feature is that a fuel return passage is provided to return the fuel to the gas phase side.
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。
The present invention will be explained in detail below with reference to the embodiments shown in FIGS. 2 and 4 and FIG. 3.
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ツトルチヤンバ
ー３が設けてある。スロツトルチヤンバー３には
上記混合気の供給量を制御するスロツトルバルブ
４が設けてあり、このスロツトルバルブ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が取り付けてある。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、さらに、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
が設けてあり、LPGボンベ６からの燃料は燃料
噴射弁５からスロツトルチヤンバー３内に噴射さ
れ、一部は絞り１０、電磁弁１１、リターン通路
１２を経てLPGボンベ６の気相側へ送り返され
るようにしてある。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、デイストリビユーター等にエンジン
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、燃料の圧力を電気的に検出
する圧力センサ１５と燃料温度を電気的に検出す
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１７に入力させてある。電子制御装
置１７は、センサ１３〜１６からの電気信号であ
るアナログ信号をデイ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CPU１９からの出力によつて燃
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り、燃料噴射弁５の開弁
時間を制御することによつて内燃機関１に供給す
る燃料量を制御するようにしてある。 FIG. 2 is an overall configuration diagram showing an embodiment of the fuel supply device of the present invention. In FIG. 2, reference numeral 1 denotes an internal combustion engine main body, and the internal combustion engine main body 1 is provided with a throttle chamber 3 that supplies an air/fuel mixture through an intake pipe 2. 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. It is installed. The fuel supply system of the fuel supply device according to the present invention includes an LPG cylinder 6, a fuel pump 7, a fuel reservoir 8, a solenoid valve 9, and a fuel injection valve 5. Via the solenoid valve 11 and return passage 12
A fuel return passage leading to the gas phase side of the LPG cylinder 6 is provided, and the fuel from the LPG cylinder 6 is injected from the fuel injection valve 5 into the throttle chamber 3. It is configured to be sent back to the gas phase side of the LPG cylinder 6 via the 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, and a distributor or the like is provided with a rotation sensor 14 that detects the engine rotation speed.
Further, the fuel reservoir 8 is provided with a pressure sensor 15 for electrically detecting the pressure of the fuel, and a temperature sensor 16 consisting of a thermistor or the like for electrically detecting the fuel temperature. The signal is input to an electronic control unit 17. The electronic control unit 17 converts analog signals, which are electrical signals from the sensors 13 to 16, into digital signals.
The signals from the D converter 18 and the A-D converter 18 are processed to calculate the valve opening time of the fuel injection valve 5, etc.
It is composed of a CPU 19 and a fuel injector drive circuit 20 that controls the opening of the fuel injector 5 based on the output from the CPU 19, and controls the internal combustion engine 1 by controlling the opening time of the fuel injector 5. The amount of fuel supplied to the engine is controlled.
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。ここで、内燃機関キースイツチオンの状態に
なると、電磁弁９，１１が開弁し、同時に燃料ポ
ンプ７が駆動され、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を通つてLPGボンベ６の気相側に戻さ
れる。したがつて、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が設けてあるので、
燃料ポンプ７から絞り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つて
おり、燃料中に気泡を発生するのが抑制される。 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 valve 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. Here, when the internal combustion engine key switch is turned on, the solenoid valves 9 and 11 are opened, and at the same time the fuel pump 7 is driven, liquid LPG fuel is supplied to the fuel injection valve 5, and the fuel injection valve 5 is supplied with liquid LPG fuel. Bubbles caused by vaporization of the fuel are returned to the gas phase side of the LPG cylinder 6 through the throttle 10, the solenoid valve 11, and the return passage 12. Therefore, only liquid fuel that does not contain bubbles is supplied to the fuel injection valve 5. 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 within the LPG cylinder 6, and the generation of bubbles 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による燃料圧力との関係につ
いて説明する。第３図は第２図の絞り１０の大き
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ｂは実際の燃
料圧力を示す。図に示すように、絞り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、絞り１０の内径が0.6
〜1.0mmの間にあり、これより絞り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。 Next, the relationship between the size of the throttle 10 provided in the fuel return passage and the fuel pressure exerted by the fuel pump 7 will be explained. FIG. 3 is a diagram showing the experimental results of the relationship between the size of the orifice 10 in FIG. , solid line b indicates the actual fuel pressure. As shown in the figure, when the inner diameter of the throttle 10 is zero, that is, when the fuel return passage is closed, the fuel pump 7 does not pressurize the fuel.
It is not possible to completely send liquid fuel to the fuel injection valve 5. The maximum pressurizing effect is when the inner diameter of the orifice 10 is 0.6
-1.0 mm, and if the inner diameter of the aperture 10 is larger than this, the pressurizing effect will be reduced. 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
により燃料噴射弁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 is always
Accordingly, liquid fuel not containing bubbles can be supplied to the fuel injection valve 5, and accurate fuel flow rate control can be performed.
第４図は第２図の絞り１０の具体的な構成を示
す断面図である。第４図において、１０ａは固定
ジエツトで、固定ジエツト１０ａは、最大加圧効
果が得られる第３図に併記した内径d1に設定して
ある。１０ｂソレノイド側ジエツトで、ソレノイ
ド２１により開閉されるようにしてある。ソレノ
イド側ジエツト１０ｂの内径は、ソレノイド側ジ
エツト１０ｂが開弁の状態のときに固定ジエツト
１０ａとの合計の等価内径が第３図に併記した内
径d2となるように設定してある。なお、ソレノイ
ド側ジエツト１０ｂは図示のように固定ジエツト
１０ａのバイパス流路に設けてある。 FIG. 4 is a sectional view showing a specific structure of the aperture 10 shown in FIG. 2. FIG. In FIG. 4, reference numeral 10a denotes a fixed jet, and the fixed jet 10a is set to have an inner diameter d1 shown in FIG. 3 to obtain the maximum pressurizing effect. 10b is a solenoid side jet which is opened and closed by a solenoid 21. The inner diameter of the solenoid side jet 10b is set so that when the solenoid side jet 10b is in the open state, the total equivalent inner diameter with the fixed jet 10a becomes the inner diameter d2 shown in FIG. Note that the solenoid side jet 10b is provided in a bypass passage of the fixed jet 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、すなわち、燃料圧力が一般に
０〜20Kg／cm2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。したがつて、
第２図の絞り１０として第４図に示す構成の絞り
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エツト１０ｂ
を開き、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 fuel composition and temperature, and it is used as an automobile fuel.
LPG is also a saturated vapor, that is, the fuel pressure generally changes by 0 to 20 kg/cm 2 , so it is impossible to control the fuel flow rate without pressure control. Therefore,
A throttle having the configuration shown in FIG. 4 is used as the throttle 10 in FIG.
2 to reduce the pressurizing effect of the fuel pump 7 shown in FIG. 2, 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図の絞りの具体
的実施例を示す断面図である。
５…燃料噴射弁、６…LPGボンベ、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。
Fig. 1 is a diagram showing changes in fuel pressure and engine speed due to blockage of the fuel supply system due to bubbles when a fuel pump is provided, and Fig. 2 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.
An overall configuration diagram showing an example of a fuel supply system for an LPG internal combustion engine. 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. , FIG. 4 is a sectional view showing a specific embodiment of the aperture shown in FIG. 2. 5... Fuel injection valve, 6... LPG cylinder, 7... Fuel pump, 8... Fuel reservoir, 9, 11... Solenoid valve, 10...
Throttle, 12... Return passage, 13... Suction pipe pressure sensor, 14... Rotation speed sensor, 15... Pressure sensor,
16...Temperature sensor, 17...Electronic control device.
Claims (1)
を制御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、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た液化石油ガス内燃機関用燃
料供給装置において、前記燃料リターン通路には
絞りを設けると共に、上記絞りは前記燃料リター
ン通路に直列に設けられた固定絞りとこの固定絞
りに並列に接続されたバイパス流路に設けられた
可変絞りとを備え、燃料圧力が所定値以上の時に
上記可変絞りを開放する様にしたことを特徴とす
る液個石油ガス内燃料機関用燃料供給装置。1 A fuel injection valve is provided, the opening time of the fuel injection valve is controlled to control the amount of liquefied petroleum gas fuel supplied to the internal combustion engine, and a liquid fuel outlet of the liquefied petroleum gas cylinder and the fuel injection valve are provided. A fuel pump is provided between the fuel pump and the fuel injection valve, and a fuel return passage is provided to return part of the fuel supplied from the fuel pump to the gas phase side of the liquefied petroleum gas cylinder. In the engine fuel supply device, the fuel return passage is provided with a restriction, and the restriction is provided in a fixed restriction provided in series with the fuel return passage and a bypass passage connected in parallel to the fixed restriction. 1. A fuel supply device for a liquid petroleum gas fuel engine, comprising a variable throttle, the variable throttle being opened when the fuel pressure is above a predetermined value.
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 JPS6065261A (en) | 1985-04-15 |
| JPH0250311B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0558592B1 (en) * | 1990-11-20 | 1999-02-03 | The Energy Research And Development Corporation | A method and a system for fuel injection |
| AUPM632394A0 (en) * | 1994-06-21 | 1994-07-14 | Biocom Pty Ltd | Determination of heat soak conditions |
| KR100747210B1 (en) | 2005-08-30 | 2007-08-07 | 현대자동차주식회사 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6065261A (en) | 1985-04-15 |
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