JP3818634B2 - LPG engine fuel supply system - Google Patents

LPG engine fuel supply system Download PDF

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Publication number
JP3818634B2
JP3818634B2 JP2001201894A JP2001201894A JP3818634B2 JP 3818634 B2 JP3818634 B2 JP 3818634B2 JP 2001201894 A JP2001201894 A JP 2001201894A JP 2001201894 A JP2001201894 A JP 2001201894A JP 3818634 B2 JP3818634 B2 JP 3818634B2
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Japan
Prior art keywords
lpg
fuel
supply system
delivery pipe
fuel supply
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JP2003020999A (en
Inventor
和哉 中田
潤 山田
佐藤　　亨
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Aisan Industry Co Ltd
Toyota Motor Corp
Soken Inc
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Aisan Industry Co Ltd
Nippon Soken Inc
Toyota Motor Corp
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    • 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

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  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、ＬＰＧ（液化石油ガス）エンジンの燃料供給系（装置）に関する。
【０００２】
【従来の技術】
ＬＰＧを利用したエンジンの燃料供給系は、特開平１０−２５２５６９号公報等により知られている。
従来のＬＰＧエンジンでは、ＬＰＧ燃料はＬＰＧタンクからデリバリパイプに導かれ、各インジェクタからエンジンの吸気系に噴射される。ＬＰＧ燃料はインジェクタから噴射される迄は液体であり、噴射直後に気化される。
【０００３】
【発明が解決しようとする課題】
しかし、従来のＬＰＧエンジンの燃料供給系では、デリバリパイプ近傍がエンジンからの受熱で昇温するので、ＬＰＧ燃料がＬＰＧタンクからインジェクタに流れる間にデリバリパイプ等で一部気化することがあり（ＬＰＧ燃料は約４ＭＰａ以下および９７℃以上で気化する）、気液混合状態でインジェクタから噴射されると、噴射が安定しない。
また、ＬＰＧエンジンの燃料供給系に気相がある状態でエンジンを停止させると、再始動時にエンジンがかかりにくい等、エンジンの制御が安定しない。
本発明の目的は、ＬＰＧ燃料供給系での気相の生成を抑制してインジェクタからの燃料噴射を安定化できるＬＰＧエンジンの燃料供給系を提供することにある。
【０００４】
【課題を解決するための手段】
上記目的は、つぎの本発明によって達成される。
（１） ＬＰＧ燃料タンクの液相部分とデリバリパイプとを接続する液相系統と、該液相系統とは別に設けられた、前記ＬＰＧ燃料タンクの気相部分と前記デリバリパイプとを接続する気相系統とを備え、前記気相系統に加圧室を設けるとともに、前記気相系統の、前記ＬＰＧ燃料タンクと前記加圧室との間の通路に気相燃料を前記ＬＰＧ燃料タンクから吸い出して加圧室に送るとともに気相燃料を液化するポンプを設け、前記加圧室と前記デリバリパイプを接続する通路に開閉弁を設けたＬＰＧエンジンの燃料供給系。
（２） 前記デリバリパイプの温度が所定温度以上で前記開閉弁を開とするように前記開閉弁の開閉を制御するＥＣＵを設けた（１）記載のＬＰＧエンジンの燃料供給系。
【０００５】
上記（１）のＬＰＧエンジンの燃料供給系では、液体ＬＰＧが一部気化して燃料供給系に気相（気化燃料）が生じても、その気体はポンプによって加圧室に送られるとともに加圧によって液化され、加圧室に一時貯えられる。そして、バルブが開かれた時にバルブを通ってデリバリパイプに送給され、デリバリパイプの温度を下げ、デリバリパイプでの気相の発生を抑え、燃料噴射を安定させる。
上記（２）のＬＰＧエンジンの燃料供給系では、デリバリパイプの温度が所定温度（たとえば、９０℃）以上になると、デリバリパイプに気相（気化燃料）が発生するおそれがあるので、所定温度以上になるとＥＣＵの指令によって開閉弁を開とし、加圧室からの液体ＬＰＧをデリバリパイプに送ってデリバリパイプの温度を下げ、デリバリパイプでの気相の発生を抑え、燃料噴射を安定させる。
【０００６】
【発明の実施の形態】
以下に、本発明実施例のＬＰＧエンジンの燃料供給系を図１〜図３を参照して、説明する。
図１において、ＬＰＧ燃料タンク１は燃料通路１１によってデリバリパイプ６（以下、単にデリバリという）に接続されており、ＬＰＧ燃料はポンプ１０で燃料通路１１を通してデリバリ６に送られ、デリバリ６から各インジェクタ７を介してＬＰＧエンジンの吸気マニホルドに噴射される。ＬＰＧ燃料は、インジェクタ７から噴射される迄は液体状態にあるべきであり、噴射後直ちに気化される。
【０００７】
ＬＰＧ燃料タンク１とは別に加圧室３が設けられる。この加圧室３は、加圧室３からデリバリ６間でのＬＰＧ燃料の気化を抑えるために、デリバリ６の近傍に設けられることが望ましい。また、加圧室３は、走行風が当たる等なるべく温度が上がらない部位に設置し、フィン等を設けて表面積を多くし風量が多く当たるようにすることが望ましい。
ＬＰＧ燃料タンク１と加圧室３とは通路８によって接続され、加圧室３とデリバリ６またはその近傍とは通路９によって接続されている。通路８には加圧室３内を液相に加圧する加圧用ポンプ２が設けられ、通路９には通路９を開閉する開閉弁４（たとえば、ＯＮ−ＯＦＦ電磁弁）が設けられる。
【０００８】
通路８はＬＰＧ燃料タンク１の上部に開口していて、ＬＰＧ燃料タンク１内の気相を吸い出すことができるようにしてある。加圧用ポンプ２は加圧室３内を所定圧力（たとえば、４ＭＰａ）以上に加圧でき、加圧室３内の圧力がある値（たとえば、５ＭＰａ）以上になると作動を停止する。ある値以上の圧力で作動を停止させる理由は、それ以上、圧力を上げたり、作動を継続しても、気相を液相にする上からは無駄であるからである。ポンプ２の作動はＥＣＵ５（エンジンコントロールコンピュータ）によって制御される。その制御は図２に示すように、ステップ１０１で加圧室３の圧力が所定圧力（たとえば、５ＭＰａ）より高いか否かを判定し、高くないなら、ステップ１０２に進んでポンプ２を作動させ、気相をタンク１から吸い出して加圧室３に送るとともに液化し、所定圧力より高ければステップ１０３に進んでポンプ２を停止する。
【０００９】
開閉弁４の作動もＥＣＵ５によって制御される。開閉弁４の制御は、図３に示すように、ステップ２０１でデリバリ６またはその近傍の温度（図示略の温度センサにて検知）が所定温度（たとえば、９０℃）より高いか否かを判定し、高ければステップ２０２に進んで開閉弁４を開として加圧室３内の液体ＬＰＧ燃料をデリバリ６に送り込み、所定温度より高くなければステップ２０３に進んで開閉弁４を閉とし、加圧室３内を加圧できるようにする。
【００１０】
つぎに、本発明実施例の作用を説明する。
ＬＰＧ燃料供給系で、液体ＬＰＧ燃料が一部気化して燃料供給系に気相が生じても、その気体はＬＰＧ燃料タンク１の上部にたまり、そこからポンプ２で吸い出されて加圧室３に送られるとともに、ポンプ２による加圧によって液化され、加圧室３内に貯えられる。そして、デリバリ６またはその近傍が、エンジンからの受熱等で温度が上がって気相が生じようとした時に、開閉弁４が開かれて開閉弁４を通る時に一部膨張して極く少量気化して低温となった液体ＬＰＧがデリバリ６に供給され、デリバリ６の温度を下げて、ＬＰＧ燃料の気化を抑制し、液体のままの状態でインジェクタ７からの燃料噴射を行わさせる。これによって気体が無いかまたはほとんど気体を含まない安定した燃料噴射が可能となり、再始動性もよくなる。
【００１１】
また、開閉弁４の開閉をＥＣＵ５にて行うようにし、デリバリ６の温度が所定温度（たとえば、約９０℃）以上になると開とするようにし、それ以外で閉とするようにしたので、気相発生のおそれがある時のみに開いて気相発生を抑えることができ、それ以外の時は閉じて加圧室３内の加圧に備えるようにすることができる。
また、ポンプ２も所定圧力（たとえば、５ＭＰａ）以上で停止するようにしたので、常時作動させて駆動エネルギーを消費することがなく、燃費を低下させない。
【００１２】
【発明の効果】
請求項１のＬＰＧエンジンの燃料供給系によれば、加圧室、ポンプ、開閉弁を設けたので、燃料供給系に気相が生じてもポンプで吸出して加圧室に送り液化し、開閉弁開時にデリバリに液化した状態で供給することができ、デリバリでの気相の発生を抑え、燃料噴射を安定させることができる。
請求項２のＬＰＧエンジンの燃料供給系によれば、デリバリの温度が所定温度以上になると開閉弁を開とするようにしたので、デリバリでの気相の発生を効果的に抑えることができ、燃料噴射を安定させることができる。
【図面の簡単な説明】
【図１】本発明実施例のＬＰＧエンジンの燃料供給系の系統図である。
【図２】本発明実施例のＬＰＧエンジンの燃料供給系の加圧用ポンプの作動制御フローチャートである。
【図３】本発明実施例のＬＰＧエンジンの燃料供給系の開閉弁の作動制御フローチャートである。
【符号の説明】
１ ＬＰＧ燃料タンク
２ （加圧用）ポンプ
３ 加圧室
４ 開閉弁
５ ＥＣＵ（エンジンコントロールコンピュータ）
６ デリバリパイプ
７ インジェクタ
８、９ 通路
１０ ポンプ
１１ 燃料通路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fuel supply system (apparatus) for an LPG (liquefied petroleum gas) engine.
[0002]
[Prior art]
An engine fuel supply system using LPG is known from JP-A-10-252569.
In a conventional LPG engine, LPG fuel is guided from an LPG tank to a delivery pipe, and injected from each injector into the engine intake system. LPG fuel is liquid until it is injected from the injector, and is vaporized immediately after injection.
[0003]
[Problems to be solved by the invention]
However, in the conventional LPG engine fuel supply system, the temperature in the vicinity of the delivery pipe rises due to the heat received from the engine, so the LPG fuel may partially vaporize in the delivery pipe or the like while flowing from the LPG tank to the injector (LPG). The fuel is vaporized at about 4 MPa or less and 97 ° C. or more), and when injected from the injector in a gas-liquid mixed state, the injection is not stable.
Further, if the engine is stopped in a state where there is a gas phase in the fuel supply system of the LPG engine, the engine control is not stable, for example, it is difficult to start the engine at the time of restart.
An object of the present invention is to provide a fuel supply system for an LPG engine that can stabilize the fuel injection from an injector by suppressing the generation of a gas phase in the LPG fuel supply system.
[0004]
[Means for Solving the Problems]
The above object is achieved by the present invention described below.
(1) A liquid phase system that connects the liquid phase portion of the LPG fuel tank and the delivery pipe, and a gas phase that is provided separately from the liquid phase system and connects the gas phase portion of the LPG fuel tank and the delivery pipe. and a phase line, provided with a pressure chamber in the vapor phase systems, the vapor line, and sucked out gas phase fuel passage between the LPG fuel tank and the pressure chamber from the LPG fuel tank a pump for liquefying a gas phase fuel and sends the pressurizing chamber is provided, the fuel supply system of LPG engines provided with a closing valve in a passage connecting said delivery pipe and the pressure chamber.
(2) The fuel supply system for an LPG engine according to (1), wherein an ECU for controlling opening / closing of the on-off valve is provided so that the opening / closing valve is opened when a temperature of the delivery pipe is equal to or higher than a predetermined temperature.
[0005]
In the fuel supply system of the LPG engine of (1) above, even if the liquid LPG is partially vaporized and a gas phase (vaporized fuel) is generated in the fuel supply system, the gas is sent to the pressurizing chamber by the pump and pressurized. And is temporarily stored in the pressure chamber. Then, when the valve is opened, it is fed to the delivery pipe through the valve, the temperature of the delivery pipe is lowered, the generation of the gas phase in the delivery pipe is suppressed, and the fuel injection is stabilized.
In the fuel supply system for the LPG engine of (2) above, when the temperature of the delivery pipe reaches a predetermined temperature (for example, 90 ° C.) or higher, a gas phase (vaporized fuel) may be generated in the delivery pipe. Then, the on-off valve is opened according to a command from the ECU, and the liquid LPG from the pressurizing chamber is sent to the delivery pipe to lower the temperature of the delivery pipe, thereby suppressing the generation of the gas phase in the delivery pipe and stabilizing the fuel injection.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Below, the fuel supply system of the LPG engine of this invention Example is demonstrated with reference to FIGS. 1-3.
In FIG. 1, an LPG fuel tank 1 is connected to a delivery pipe 6 (hereinafter simply referred to as a delivery) by a fuel passage 11, and LPG fuel is sent to the delivery 6 through the fuel passage 11 by a pump 10. 7 is injected into the intake manifold of the LPG engine. The LPG fuel should be in a liquid state until it is injected from the injector 7 and is vaporized immediately after injection.
[0007]
A pressurizing chamber 3 is provided separately from the LPG fuel tank 1. The pressurizing chamber 3 is desirably provided in the vicinity of the delivery 6 in order to suppress vaporization of the LPG fuel between the pressurizing chamber 3 and the delivery 6. Further, it is desirable that the pressurizing chamber 3 is installed at a site where the temperature does not rise as much as possible, such as when the traveling wind hits, and fins are provided to increase the surface area so that the amount of air hits.
The LPG fuel tank 1 and the pressurizing chamber 3 are connected by a passage 8, and the pressurizing chamber 3 and the delivery 6 or the vicinity thereof are connected by a passage 9. The passage 8 is provided with a pressurizing pump 2 that pressurizes the inside of the pressurizing chamber 3 to a liquid phase, and the passage 9 is provided with an on-off valve 4 (for example, an ON-OFF electromagnetic valve) that opens and closes the passage 9.
[0008]
The passage 8 is opened at the top of the LPG fuel tank 1 so that the gas phase in the LPG fuel tank 1 can be sucked out. The pressurizing pump 2 can pressurize the inside of the pressurizing chamber 3 to a predetermined pressure (for example, 4 MPa) or more, and stops the operation when the pressure in the pressurizing chamber 3 becomes a certain value (for example, 5 MPa) or more. The reason why the operation is stopped at a pressure of a certain value or more is that even if the pressure is increased or the operation is continued, it is useless to make the gas phase into a liquid phase. The operation of the pump 2 is controlled by an ECU 5 (engine control computer). As shown in FIG. 2, the control determines in step 101 whether or not the pressure in the pressurizing chamber 3 is higher than a predetermined pressure (for example, 5 MPa). If not, the process proceeds to step 102 and the pump 2 is operated. The gas phase is sucked out from the tank 1 and sent to the pressurizing chamber 3 and liquefied. If the pressure is higher than the predetermined pressure, the routine proceeds to step 103 and the pump 2 is stopped.
[0009]
The operation of the on-off valve 4 is also controlled by the ECU 5. As shown in FIG. 3, the control of the on-off valve 4 determines whether or not the delivery 6 or a temperature in the vicinity thereof (detected by a temperature sensor not shown) is higher than a predetermined temperature (for example, 90 ° C.) as shown in FIG. If it is higher, the routine proceeds to step 202 where the on-off valve 4 is opened and the liquid LPG fuel in the pressurizing chamber 3 is sent to the delivery 6. If it is not higher than the predetermined temperature, the routine proceeds to step 203 where the on-off valve 4 is closed and pressurized. The inside of the chamber 3 can be pressurized.
[0010]
Next, the operation of the embodiment of the present invention will be described.
Even if the liquid LPG fuel partially vaporizes in the LPG fuel supply system and a gas phase is generated in the fuel supply system, the gas accumulates in the upper portion of the LPG fuel tank 1 and is sucked out by the pump 2 from there and is pressurized. 3 and is liquefied by pressurization by the pump 2 and stored in the pressurization chamber 3. When the temperature of the delivery 6 or its vicinity rises due to heat received from the engine or the like and a gas phase is about to be generated, when the on-off valve 4 is opened and passes through the on-off valve 4, it partially expands and a very small amount of gas is generated. The liquid LPG that has become low in temperature is supplied to the delivery 6, the temperature of the delivery 6 is lowered, the vaporization of the LPG fuel is suppressed, and the fuel is injected from the injector 7 in the liquid state. As a result, stable fuel injection with no gas or almost no gas is possible, and the restartability is improved.
[0011]
Further, the on-off valve 4 is opened and closed by the ECU 5 so that it is opened when the temperature of the delivery 6 exceeds a predetermined temperature (for example, about 90 ° C.) and closed at other times. It can be opened only when there is a possibility of phase generation, and gas phase generation can be suppressed, and at other times it can be closed to prepare for pressurization in the pressurizing chamber 3.
In addition, since the pump 2 is also stopped at a predetermined pressure (for example, 5 MPa) or more, the pump 2 is always operated and does not consume drive energy, and the fuel consumption is not reduced.
[0012]
【The invention's effect】
According to the fuel supply system of the LPG engine of the first aspect, since the pressurizing chamber, the pump, and the on-off valve are provided, even if a gas phase is generated in the fuel supply system, the gas is sucked out by the pump and sent to the pressure chamber to be liquefied. When the valve is opened, it can be supplied in a liquefied state at the delivery, the generation of the gas phase at the delivery can be suppressed, and the fuel injection can be stabilized.
According to the fuel supply system of the LPG engine according to claim 2, since the on-off valve is opened when the delivery temperature becomes equal to or higher than the predetermined temperature, generation of a gas phase in the delivery can be effectively suppressed, Fuel injection can be stabilized.
[Brief description of the drawings]
FIG. 1 is a system diagram of a fuel supply system of an LPG engine according to an embodiment of the present invention.
FIG. 2 is an operation control flowchart of a pressurizing pump of a fuel supply system of an LPG engine according to an embodiment of the present invention.
FIG. 3 is an operation control flowchart of an on-off valve of a fuel supply system of an LPG engine according to an embodiment of the present invention.
[Explanation of symbols]
1 LPG fuel tank 2 (for pressurization) pump 3 pressurization chamber 4 on-off valve 5 ECU (engine control computer)
6 Delivery pipe 7 Injector 8, 9 Passage 10 Pump 11 Fuel passage

Claims (2)

ＬＰＧ燃料タンクの液相部分とデリバリパイプとを接続する液相系統と、該液相系統とは別に設けられた、前記ＬＰＧ燃料タンクの気相部分と前記デリバリパイプとを接続する気相系統とを備え、前記気相系統に加圧室を設けるとともに、前記気相系統の、前記ＬＰＧ燃料タンクと前記加圧室との間の通路に気相燃料を前記ＬＰＧ燃料タンクから吸い出して加圧室に送るとともに気相燃料を液化するポンプを設け、前記加圧室と前記デリバリパイプを接続する通路に開閉弁を設けたＬＰＧエンジンの燃料供給系。 A liquid phase system for connecting a liquid phase portion of an LPG fuel tank and a delivery pipe, and a gas phase system for connecting the gas phase portion of the LPG fuel tank and the delivery pipe provided separately from the liquid phase system; the provided, the pressure chamber is provided on the gas-phase system, the vapor-phase line, and sucked out gas phase fuel passage from the LPG fuel tank pressurization chamber between said LPG fuel tank and the pressure chamber vapor fuel pump for liquefying provided, the fuel supply system of LPG engines provided with a closing valve in a passage connecting said delivery pipe and the pressurizing chamber and sends the. 前記デリバリパイプの温度が所定温度以上で前記開閉弁を開とするように前記開閉弁の開閉を制御するＥＣＵを設けた請求項１記載のＬＰＧエンジンの燃料供給系。The fuel supply system for an LPG engine according to claim 1, further comprising an ECU that controls opening and closing of the on-off valve so that the opening and closing valve is opened when a temperature of the delivery pipe is equal to or higher than a predetermined temperature.
JP2001201894A 2001-07-03 2001-07-03 LPG engine fuel supply system Expired - Lifetime JP3818634B2 (en)

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