JP2011052668A - Fuel tank - Google Patents

Fuel tank Download PDF

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JP2011052668A
JP2011052668A JP2009204911A JP2009204911A JP2011052668A JP 2011052668 A JP2011052668 A JP 2011052668A JP 2009204911 A JP2009204911 A JP 2009204911A JP 2009204911 A JP2009204911 A JP 2009204911A JP 2011052668 A JP2011052668 A JP 2011052668A
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fuel
liquefied gas
fuel tank
gas fuel
internal combustion
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JP5253335B2 (en
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Toyoichi Umehana
豊一 梅花
Keiji Iwatsuki
恵司 岩月
Masahiro Nagasaka
昌宏 長坂
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Central Motor Wheel Co Ltd
Toyota Motor Corp
FTS Co Ltd
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Central Motor Wheel Co Ltd
Toyota Motor Corp
FTS Co Ltd
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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
    • Y02T10/12—Improving ICE efficiencies
    • 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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  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel tank minimizing an installation space for a heating means and the fuel tank without requiring special equipment or a fuel pump for heating liquefied gas fuel, in an internal combustion engine using the liquefied gas fuel and liquid fuel as fuel. <P>SOLUTION: A liquefied gas fuel tank is provided inside of a liquid fuel tank, and the liquefied gas fuel tank is formed as a pressure-resistant vessel. Return fuel from the fuel injection path of the internal combustion engine is introduced to the liquid fuel tank, and the liquefied gas fuel tank is heated by a heat quantity of return fuel. Thereby, the liquefied gas fuel is evaporated inside of the liquefied gas fuel tank, and the evaporated liquefied gas fuel is delivered from the tank. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、内燃機関の燃料タンクに関する。   The present invention relates to a fuel tank for an internal combustion engine.

液化ガス燃料を主燃料とする内燃機関を搭載する車両においては、液化ガス燃料を加圧して液化し、タンクに貯蔵するが、寒冷地での起動時などの低温時には、液化ガス燃料の蒸気圧が低いため、気体として取り出すことができず、燃料タンクから内燃機関に液化ガス燃料を供給するためには、燃料ポンプを備えることが必要である。   In vehicles equipped with an internal combustion engine that uses liquefied gas fuel as the main fuel, the liquefied gas fuel is pressurized and liquefied and stored in a tank. At low temperatures such as when starting up in cold regions, the vapor pressure of the liquefied gas fuel Therefore, in order to supply the liquefied gas fuel from the fuel tank to the internal combustion engine, it is necessary to provide a fuel pump.

また、液化ガス燃料には、気化するために非常に大きな熱量を必要とするものがあり、この場合には、液化した燃料を内燃機関に噴射しても、噴射によって気化することが期待できない。   Some liquefied gas fuels require a very large amount of heat to vaporize. In this case, even if the liquefied fuel is injected into the internal combustion engine, it cannot be expected to be vaporized by the injection.

そこで、液化ガス燃料を主燃料とする内燃機関を搭載する車両においては、液化した燃料を加熱する手段を備えることが必要となり、設備コストや設置スペースが増加するという問題が発生する。   Therefore, in a vehicle equipped with an internal combustion engine that uses liquefied gas fuel as a main fuel, it is necessary to provide means for heating the liquefied fuel, which causes a problem that equipment costs and installation space increase.

液化ガス燃料を主燃料とする場合の対策として、寒冷地での起動時などの低温時にはガソリン等の液体燃料を使用し、液体燃料使用時に液化ガス燃料を加熱し、起動後、液化ガス燃料に切り替える方法が考えられる。この場合、２種類の燃料を備えるために、２つの燃料タンクを備えることが必要となり、設備コストや設置スペースが増加するという問題が発生する。   As a countermeasure when liquefied gas fuel is used as the main fuel, liquid fuel such as gasoline is used at low temperatures such as when starting in cold regions, and liquefied gas fuel is heated when using liquid fuel. A method of switching is conceivable. In this case, in order to provide two types of fuel, it is necessary to provide two fuel tanks, which causes a problem that the equipment cost and installation space increase.

内燃機関の燃料として２種類の燃料を使用する技術は、例えば、特許文献１〜８に紹介されている。特許文献１〜２では、燃料タンクを二重構造として、設置スペース上の問題を解決している。特許文献３〜５では、２つの燃料タンクを個別に備え、車両への搭載位置を、それぞれ離れた場所に設けることによって、設置スペース上の問題を解決しているものと考えられる。特許文献６〜８は、２つの燃料タンクを個別に備えているが、設置スペース上の問題をどのように解決しているかについては、記載されていない。   Technologies that use two types of fuel as fuel for an internal combustion engine are introduced in, for example, Patent Documents 1 to 8. In patent documents 1 and 2, the fuel tank has a double structure to solve the problem of installation space. In Patent Documents 3 to 5, it is considered that the problem on the installation space is solved by providing two fuel tanks individually and providing the mounting positions on the vehicle at different locations. Patent Documents 6 to 8 individually include two fuel tanks, but do not describe how to solve the problem of installation space.

また、特許文献１〜８のいずれにおいても、２種類の燃料の使い分けについて、副燃料による低温起動時に主燃料を加熱し、起動後、加熱された主燃料に切り替える技術については、記載されていない。   Further, in any of Patent Documents 1 to 8, there is no description of a technique for heating the main fuel at the time of low-temperature start-up by the auxiliary fuel and switching to the heated main fuel after start-up for properly using the two types of fuel. .

特開２００２−１３０５９５号公報JP 2002-130595 A 特開２００８−３０６４２号公報JP 2008-30642 A 特開２００８−５５９３３号公報JP 2008-55933 A 特開２００８−５５９３４号公報JP 2008-55934 A 特開２００８−６８７７９号公報JP 2008-68779 A 特開平５−７１４３３号公報Japanese Patent Laid-Open No. 5-71433 特開平５−１０６５２５号公報JP-A-5-106525 特開平５−３１２１１５号公報JP-A-5-312115

本発明は、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化ガス燃料を加熱する特別な設備や燃料ポンプを必要とせず、加熱手段や燃料タンクの設置スペースを最小にする燃料タンクを提供することを目的としている。   The present invention relates to an internal combustion engine that uses liquefied gas fuel and liquid fuel as fuel, and does not require a special facility or fuel pump for heating the liquefied gas fuel, and a fuel tank that minimizes the installation space for the heating means and the fuel tank. The purpose is to provide.

請求項１に記載の発明によれば、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化ガス燃料のタンクを、液体燃料のタンクの内部に設け、液化ガス燃料のタンクを、耐圧容器として構成し、液体燃料のタンクには、内燃機関の燃料噴射経路からのリターン燃料を導き、リターン燃料の有する熱量により、液化ガス燃料のタンクを加熱することによって、液化ガス燃料のタンクの内部で、液化ガス燃料を気化し、液化ガス燃料のタンクから、気化した液化ガス燃料を送出する、内燃機関の燃料タンクが提供される。   According to the first aspect of the present invention, in the internal combustion engine using liquefied gas fuel and liquid fuel as fuel, the liquefied gas fuel tank is provided inside the liquid fuel tank, and the liquefied gas fuel tank is The liquid fuel tank is configured as a container, and the return fuel from the fuel injection path of the internal combustion engine is guided to the inside of the liquefied gas fuel tank by heating the liquefied gas fuel tank with the amount of heat of the return fuel. Thus, there is provided a fuel tank for an internal combustion engine that vaporizes the liquefied gas fuel and delivers the vaporized liquefied gas fuel from the tank of the liquefied gas fuel.

すなわち、請求項１の発明では、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化された液化ガス燃料を貯蔵するタンクを、液体燃料のタンクの内部に設け、２つの燃料タンクを備えることによる設置スペースの増加を防止し、また、燃料タンクの二重構造を利用して、液化ガス燃料を加熱するための特別な加熱手段を追加せずに、内燃機関によって加熱されたリターン燃料の熱量により、液化ガス燃料を加熱し、気化する。気化した液化ガス燃料は、圧力が高いので、液化ガス燃料のタンクは、耐圧容器として構成する。また、タンク内の圧力が高いので、この圧力によって、気化した液化ガス燃料を、タンクから送り出すことができ、燃料ポンプを備える必要がない。   That is, according to the first aspect of the present invention, in an internal combustion engine using liquefied gas fuel and liquid fuel as fuel, a tank for storing the liquefied liquefied gas fuel is provided inside the liquid fuel tank, and two fuel tanks are provided. The return fuel heated by the internal combustion engine is prevented without increasing the installation space due to the provision, and without adding a special heating means for heating the liquefied gas fuel by utilizing the double structure of the fuel tank. The liquefied gas fuel is heated and vaporized by the amount of heat. Since the vaporized liquefied gas fuel has a high pressure, the liquefied gas fuel tank is configured as a pressure vessel. Further, since the pressure in the tank is high, vaporized liquefied gas fuel can be sent out from the tank by this pressure, and there is no need to provide a fuel pump.

請求項２に記載の発明によれば、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化ガス燃料のタンクを、液体燃料のタンクの内部に設け、液化ガス燃料のタンクを、耐圧容器として構成し、液体燃料のタンクには、内燃機関を冷却して加熱された冷却水、又は、内燃機関の排気ガスを導き、冷却水又は排気ガスの熱量により、液化ガス燃料のタンクを加熱することによって、液化ガス燃料のタンクの内部で、液化ガス燃料を気化し、液化ガス燃料のタンクから、気化した液化ガス燃料を送出する、内燃機関の燃料タンクが提供される。   According to the second aspect of the present invention, in the internal combustion engine using liquefied gas fuel and liquid fuel as fuel, the liquefied gas fuel tank is provided inside the liquid fuel tank, and the liquefied gas fuel tank is Constructed as a container, the liquid fuel tank is cooled by heating the internal combustion engine or the exhaust gas of the internal combustion engine is guided, and the liquefied gas fuel tank is heated by the amount of heat of the cooling water or exhaust gas Thus, a fuel tank for an internal combustion engine is provided in which the liquefied gas fuel is vaporized inside the liquefied gas fuel tank and the vaporized liquefied gas fuel is sent out from the liquefied gas fuel tank.

すなわち、請求項２の発明では、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化された液化ガス燃料を貯蔵するタンクを、液体燃料のタンクの内部に設け、２つの燃料タンクを備えることによる設置スペースの増加を防止し、また、燃料タンクの二重構造を利用して、液化ガス燃料を加熱するための特別な加熱手段を追加せずに、内燃機関を冷却して加熱された冷却水、又は、内燃機関の排気ガスの熱量により、液化ガス燃料を加熱し、気化する。気化した液化ガス燃料は、圧力が高いので、液化ガス燃料のタンクは、耐圧容器として構成する。また、タンク内の圧力が高いので、この圧力によって、気化した液化ガス燃料を、タンクから送り出すことができ、燃料ポンプを備える必要がない。   That is, in the invention of claim 2, in an internal combustion engine using liquefied gas fuel and liquid fuel as fuel, a tank for storing the liquefied liquefied gas fuel is provided inside the tank of liquid fuel, and two fuel tanks are provided. The installation space is prevented from increasing, and the internal combustion engine is cooled and heated without adding special heating means for heating the liquefied gas fuel by utilizing the double structure of the fuel tank. The liquefied gas fuel is heated and vaporized by the amount of heat of the cooling water or the exhaust gas of the internal combustion engine. Since the vaporized liquefied gas fuel has a high pressure, the liquefied gas fuel tank is configured as a pressure vessel. Further, since the pressure in the tank is high, vaporized liquefied gas fuel can be sent out from the tank by this pressure, and there is no need to provide a fuel pump.

請求項３に記載の発明によれば、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化ガス燃料のタンクを、液体燃料のタンクの内部に設け、液化ガス燃料のタンクを、耐圧容器として構成し、液体燃料のタンクには、内燃機関の燃料噴射経路からのリターン燃料、内燃機関を冷却して加熱された冷却水、内燃機関の排気ガスのうち、２つ以上を導き、リターン燃料、冷却水、排気ガスの熱量のうち、２つ以上の組み合わせにより、液化ガス燃料のタンクを加熱することによって、液化ガス燃料のタンクの内部で、液化ガス燃料を気化し、液化ガス燃料のタンクから、気化した液化ガス燃料を送出する、内燃機関の燃料タンクが提供される。   According to the third aspect of the present invention, in the internal combustion engine using liquefied gas fuel and liquid fuel as fuel, the liquefied gas fuel tank is provided inside the liquid fuel tank, and the liquefied gas fuel tank is Constructed as a container, the liquid fuel tank leads two or more of return fuel from the fuel injection path of the internal combustion engine, cooling water heated by cooling the internal combustion engine, and exhaust gas of the internal combustion engine, and returns The liquefied gas fuel is vaporized inside the liquefied gas fuel tank by heating the liquefied gas fuel tank by combining two or more calories of fuel, cooling water, and exhaust gas. A fuel tank for an internal combustion engine is provided for delivering vaporized liquefied gas fuel from the tank.

すなわち、請求項３の発明では、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化された液化ガス燃料を貯蔵するタンクを、液体燃料のタンクの内部に設け、２つの燃料タンクを備えることによる設置スペースの増加を防止し、また、燃料タンクの二重構造を利用して、液化ガス燃料を加熱するための特別な加熱手段を追加せずに、内燃機関によって加熱されたリターン燃料、内燃機関を冷却して加熱された冷却水、又は、内燃機関の排気ガスの熱量のうち、２つ以上の組み合わせにより、液化ガス燃料を加熱し、気化する。気化した液化ガス燃料は、圧力が高いので、液化ガス燃料のタンクは、耐圧容器として構成する。また、タンク内の圧力が高いので、この圧力によって、気化した液化ガス燃料を、タンクから送り出すことができ、燃料ポンプを備える必要がない。   That is, in the invention of claim 3, in an internal combustion engine using liquefied gas fuel and liquid fuel as fuel, a tank for storing the liquefied liquefied gas fuel is provided inside the tank of liquid fuel, and two fuel tanks are provided. The return fuel heated by the internal combustion engine is prevented without increasing the installation space due to the provision, and without adding a special heating means for heating the liquefied gas fuel by utilizing the double structure of the fuel tank. The liquefied gas fuel is heated and vaporized by a combination of two or more of the cooling water heated by cooling the internal combustion engine or the amount of heat of the exhaust gas of the internal combustion engine. Since the vaporized liquefied gas fuel has a high pressure, the liquefied gas fuel tank is configured as a pressure vessel. Further, since the pressure in the tank is high, vaporized liquefied gas fuel can be sent out from the tank by this pressure, and there is no need to provide a fuel pump.

請求項４に記載の発明によれば、気化した液化ガス燃料の圧力を利用して、液化ガス燃料のタンクから、液体の液化ガス燃料を送出する、請求項１から３のいずれか１項に記載の内燃機関の燃料タンクが提供される。   According to a fourth aspect of the present invention, in any one of the first to third aspects, the liquid liquefied gas fuel is delivered from the tank of the liquefied gas fuel using the pressure of the vaporized liquefied gas fuel. A fuel tank for the described internal combustion engine is provided.

すなわち、請求項４の発明では、タンク内の圧力が高いので、この圧力によって、車両システムの要求に応じて、液体の液化ガス燃料を、タンクから送り出すことができ、燃料ポンプを備える必要がない。   That is, in the invention of claim 4, since the pressure in the tank is high, the liquid liquefied gas fuel can be sent out from the tank according to the demand of the vehicle system by this pressure, and there is no need to provide a fuel pump. .

請求項５に記載の発明によれば、液化ガス燃料のタンク内の燃料の温度又は圧力を検出する、温度センサー又は圧力センサーを備える、請求項１から４のいずれか１項に記載の内燃機関の燃料タンクが提供される。   According to the invention described in claim 5, the internal combustion engine according to any one of claims 1 to 4, further comprising a temperature sensor or a pressure sensor for detecting the temperature or pressure of the fuel in the tank of the liquefied gas fuel. A fuel tank is provided.

すなわち、請求項５の発明では、液化ガス燃料のタンク内の燃料の温度又は圧力を検出し、検出値に応じて、内燃機関に、液化ガス燃料を供給するか、又は液体燃料を供給するか、を判断する。   That is, in the invention of claim 5, the temperature or pressure of the fuel in the tank of liquefied gas fuel is detected, and whether the liquefied gas fuel is supplied to the internal combustion engine or the liquid fuel is supplied according to the detected value. .

請求項６に記載の発明によれば、液化ガス燃料のタンク内の燃料の温度又は圧力が、所定値以下の場合には、液体燃料を内燃機関に供給する、請求項１から５のいずれか１項に記載の内燃機関の燃料タンクが提供される。   According to the invention described in claim 6, when the temperature or pressure of the fuel in the liquefied gas fuel tank is equal to or lower than a predetermined value, the liquid fuel is supplied to the internal combustion engine. An internal combustion engine fuel tank according to claim 1 is provided.

すなわち、請求項６の発明では、液化ガス燃料のタンク内の燃料の温度又は圧力の検出値が、所定値以下の場合には、低温始動と判断し、低温始動時には、液体燃料を内燃機関に供給して、内燃機関を始動する。内燃機関が始動して、リターン燃料、冷却水、排気ガスの温度が上昇し、これらの熱量を利用して、液化ガス燃料のタンク内の燃料の温度及び圧力が上昇し、温度又は圧力の検出値が、所定値を超えた場合には、内燃機関に供給する燃料を、液化ガス燃料に切り替える。   That is, in the invention of claim 6, when the detected value of the temperature or pressure of the fuel in the tank of liquefied gas fuel is not more than a predetermined value, it is determined that the engine is cold start, and at the time of cold start, the liquid fuel is supplied to the internal combustion engine. Supply and start the internal combustion engine. The internal combustion engine is started and the temperature of return fuel, cooling water, and exhaust gas rises. Using these calories, the temperature and pressure of the fuel in the tank of liquefied gas fuel rises, and the temperature or pressure is detected. When the value exceeds a predetermined value, the fuel supplied to the internal combustion engine is switched to liquefied gas fuel.

請求項７に記載の発明によれば、請求項１から６のいずれか１項に記載の内燃機関の燃料タンクを備える、車両が提供される。   According to invention of Claim 7, a vehicle provided with the fuel tank of the internal combustion engine of any one of Claim 1 to 6 is provided.

すなわち、請求項７の発明では、液化ガス燃料と液体燃料とを燃料とする内燃機関を搭載する車両において、液化ガス燃料を加熱する特別な設備や燃料ポンプを必要とせず、加熱手段や燃料タンクの設置スペースを最小にする燃料タンクを備えた、車両が提供される。   That is, in the invention of claim 7, in a vehicle equipped with an internal combustion engine using liquefied gas fuel and liquid fuel as fuel, no special equipment or fuel pump for heating the liquefied gas fuel is required, and the heating means and the fuel tank A vehicle is provided with a fuel tank that minimizes installation space.

各請求項に記載の発明によれば、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化ガス燃料を加熱する特別な設備や燃料ポンプを必要とせず、加熱手段や燃料タンクの設置スペースを最小にする燃料タンクを提供するという共通の効果を奏する。   According to the invention described in each claim, in an internal combustion engine using liquefied gas fuel and liquid fuel as fuel, no special equipment or fuel pump for heating the liquefied gas fuel is required, and the heating means and the fuel tank are installed. The common effect is to provide a fuel tank that minimizes space.

本発明を燃料タンクに適用した場合の、実施形態の概略構成を説明する図であり、気体の液化ガス燃料を取り出す図である。It is a figure explaining schematic structure of an embodiment at the time of applying the present invention to a fuel tank, and is a figure taking out gaseous liquefied gas fuel. 本発明を燃料タンクに適用した場合の、実施形態の概略構成を説明する図であり、液体の液化ガス燃料を取り出す図である。It is a figure explaining schematic structure of an embodiment at the time of applying the present invention to a fuel tank, and is a figure which takes out liquid liquefied gas fuel.

以下、添付図面を用いて本発明の実施形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１、図２は、本発明を燃料タンクに適用した場合の、実施形態の概略構成を示す。液化ガス燃料、例えばＬＰＧやアンモニア、と、ガソリン等の液体燃料と、を燃料とする内燃機関において、液化ガス燃料を貯蔵するタンク２０を、液体燃料のタンク１０の内部に設ける。液体燃料のタンク１０には、内燃機関の燃料噴射経路から、リターン燃料を、リターン燃料入口１４に導き、内燃機関で加熱されたリターン燃料の熱量により、液化ガス燃料のタンク２０を加熱する。従って、液化ガス燃料のタンク２０の内部では、液化ガス燃料が気化し、図１のように、気化した液化ガス燃料を、気化した液化ガス燃料の有する圧力を利用して、燃料出口２２から送出する。気化した液化ガス燃料は、高い圧力を有するため、液化ガス燃料のタンク２０は、耐圧容器として構成する。或いは、図２のように、気化した液化ガス燃料の有する圧力を利用して、液体の液化ガス燃料を、燃料出口２２から送出することもできる。   1 and 2 show a schematic configuration of an embodiment when the present invention is applied to a fuel tank. In an internal combustion engine that uses liquefied gas fuel, for example, LPG, ammonia, and liquid fuel such as gasoline, a tank 20 that stores the liquefied gas fuel is provided inside the liquid fuel tank 10. In the liquid fuel tank 10, the return fuel is led from the fuel injection path of the internal combustion engine to the return fuel inlet 14, and the liquefied gas fuel tank 20 is heated by the amount of heat of the return fuel heated by the internal combustion engine. Therefore, the liquefied gas fuel is vaporized inside the liquefied gas fuel tank 20, and the vaporized liquefied gas fuel is sent out from the fuel outlet 22 using the pressure of the vaporized liquefied gas fuel as shown in FIG. To do. Since the vaporized liquefied gas fuel has a high pressure, the liquefied gas fuel tank 20 is configured as a pressure vessel. Alternatively, as shown in FIG. 2, the liquid liquefied gas fuel can be sent out from the fuel outlet 22 using the pressure of the vaporized liquefied gas fuel.

このように構成することにより、液化ガス燃料と液体燃料とを燃料とする内燃機関において、液化ガス燃料を加熱する特別な設備や燃料ポンプを必要とせず、加熱手段や燃料タンクの設置スペースを最小にすることができる。   With this configuration, in an internal combustion engine using liquefied gas fuel and liquid fuel as fuel, no special equipment or fuel pump for heating the liquefied gas fuel is required, and the installation space for the heating means and the fuel tank is minimized. Can be.

或いは、液化ガス燃料のタンク２０を加熱するために、リターン燃料を利用する代わりに、内燃機関を冷却して加熱された冷却水、又は、内燃機関の排気ガスを、液体燃料のタンク１０に導き、冷却水又は排気ガスの熱量により、液化ガス燃料のタンク２０を加熱することもできる。また、リターン燃料、冷却水、排気ガスのうち、２つ以上を液化ガス燃料のタンク２０に導き、２つ以上の組み合わせによって液化ガス燃料のタンク２０を加熱することもできる。これらいずれの手段によっても、液化ガス燃料を加熱する特別な設備や燃料ポンプを必要とせず、加熱手段や燃料タンクの設置スペースを最小にすることができるが、冷却水や排気ガスを利用する場合には、液体燃料タンク１０内に、冷却水や排気ガスが通過する配管を設ける必要があり、また、タンク外の配管設備も必要であるため、リターン燃料を単独で利用することが、より好ましい。   Alternatively, instead of using return fuel to heat the tank 20 of liquefied gas fuel, cooling water heated by cooling the internal combustion engine or exhaust gas of the internal combustion engine is led to the liquid fuel tank 10. The liquefied gas fuel tank 20 can be heated by the amount of heat of the cooling water or the exhaust gas. Further, two or more of return fuel, cooling water, and exhaust gas may be led to the liquefied gas fuel tank 20 to heat the liquefied gas fuel tank 20 by a combination of two or more. Any of these means does not require any special equipment or fuel pump for heating the liquefied gas fuel, and the installation space for the heating means and fuel tank can be minimized, but when cooling water or exhaust gas is used. In this case, it is necessary to provide piping through which the cooling water and exhaust gas pass in the liquid fuel tank 10, and piping equipment outside the tank is also required. Therefore, it is more preferable to use the return fuel alone. .

液化ガス燃料のタンクには、タンク内の燃料の温度を検出する温度センサー３０を備え、低温起動時等の、温度センサー３０の検出する温度が所定値以下の場合には、液体燃料タンク１０内のガソリンを内燃機関に供給し、温度センサー３０の検出する温度が所定値を超えた場合には、液化ガス燃料を、液化ガス燃料のタンク２０から、内燃機関に供給するように、切り替え制御する。この場合、気化した液化ガス燃料の温度と圧力との間には、対応関係が存在するので、温度センサーの代わりに、圧力センサーを備えることによっても、同様の制御をすることができる。   The liquefied gas fuel tank is provided with a temperature sensor 30 for detecting the temperature of the fuel in the tank. When the temperature detected by the temperature sensor 30 is equal to or lower than a predetermined value, such as at low temperature startup, the liquid fuel tank 10 The gasoline is supplied to the internal combustion engine, and when the temperature detected by the temperature sensor 30 exceeds a predetermined value, switching control is performed so that liquefied gas fuel is supplied from the liquefied gas fuel tank 20 to the internal combustion engine. . In this case, since a correspondence relationship exists between the temperature and pressure of the vaporized liquefied gas fuel, the same control can be performed by providing a pressure sensor instead of the temperature sensor.

すなわち、低温時に起動する場合は、まず、液体燃料タンク１０内のガソリンを内燃機関に供給・噴射して、暖気運転を行う。噴射装置からのリターン燃料は、温度が上昇しており、液体燃料タンク１０に流入して、液体燃料タンク１０内のガソリンの温度を上昇させる。上昇したガソリンの温度は、液化ガス燃料のタンク２０に伝達し、タンク２０内の液化ガス燃料の温度を上昇させ、液化ガス燃料を気化させる。気化した液化ガス燃料の温度が設定値よりも高くなった場合、すなわち、気化した液化ガス燃料の圧力が圧送に十分な圧力で、内燃機関での噴射に十分な圧力であると判断される温度になった場合には、燃料供給を、ガソリンから、液化ガス燃料に切り替え、通常運転を行う。   That is, when starting at a low temperature, first, the gasoline in the liquid fuel tank 10 is supplied to the internal combustion engine and injected to perform the warm-up operation. The temperature of the return fuel from the injector rises and flows into the liquid fuel tank 10 to raise the temperature of gasoline in the liquid fuel tank 10. The temperature of the increased gasoline is transmitted to the tank 20 of liquefied gas fuel, the temperature of the liquefied gas fuel in the tank 20 is raised, and the liquefied gas fuel is vaporized. When the temperature of the vaporized liquefied gas fuel becomes higher than the set value, that is, the temperature at which the pressure of the vaporized liquefied gas fuel is sufficient for pumping and sufficient for injection in the internal combustion engine. In this case, the fuel supply is switched from gasoline to liquefied gas fuel, and normal operation is performed.

以上において、上述の基本構成のほか、図１の実施形態では、液化ガス燃料タンク２０の安全対策として、液化ガス燃料タンク２０内の圧力が過剰になることを防止するために、圧力リリーフ弁２５を備えており、供給された液化ガス燃料が、例えば配管の破損等により過剰に流出することを防止するために、過流防止弁２９と、緊急遮断弁２８とを備えている。更に、液化ガス燃料タンク２０は、タンク内に液化ガス燃料が過剰に充填されることを防止するために、過充填防止弁２７を備えている。   In the above, in addition to the basic configuration described above, in the embodiment of FIG. 1, as a safety measure for the liquefied gas fuel tank 20, the pressure relief valve 25 is used to prevent the pressure in the liquefied gas fuel tank 20 from becoming excessive. In order to prevent the supplied liquefied gas fuel from flowing out excessively due to, for example, damage to the piping, an overflow prevention valve 29 and an emergency shutoff valve 28 are provided. Further, the liquefied gas fuel tank 20 includes an overfill prevention valve 27 in order to prevent the liquefied gas fuel from being excessively filled in the tank.

１０ 液体燃料タンク
１１ 燃料注入口
１２ 燃料出口
１３ 燃料残量計
１４ リターン燃料入口
１５ 燃料ポンプ
１６ 逆止弁
２０ 液化ガス燃料タンク
２１ 燃料注入口
２２ 燃料出口
２３ 燃料残量計
２５ 圧力リリーフ弁
２６ 逆止弁
２７ 過充填防止弁
２８ 緊急遮断弁
２９ 過流防止弁
３０ 温度センサー DESCRIPTION OF SYMBOLS 10 Liquid fuel tank 11 Fuel inlet 12 Fuel outlet 13 Fuel fuel gauge 14 Return fuel inlet 15 Fuel pump 16 Check valve 20 Liquefied gas fuel tank 21 Fuel inlet 22 Fuel outlet 23 Fuel fuel gauge 25 Pressure relief valve 26 Reverse Stop valve 27 Overfill prevention valve 28 Emergency shut-off valve 29 Overflow prevention valve 30 Temperature sensor

Claims (7)

液化ガス燃料と液体燃料とを燃料とする内燃機関において、
前記液化ガス燃料のタンクを、前記液体燃料のタンクの内部に設け、
前記液化ガス燃料のタンクを、耐圧容器として構成し、
前記液体燃料のタンクには、前記内燃機関の燃料噴射経路からのリターン燃料を導き、
前記リターン燃料の有する熱量により、前記液化ガス燃料のタンクを加熱することによって、前記液化ガス燃料のタンクの内部で、前記液化ガス燃料を気化し、
前記液化ガス燃料のタンクから、気化した液化ガス燃料を送出する、
内燃機関の燃料タンク。 In an internal combustion engine that uses liquefied gas fuel and liquid fuel as fuel,
The liquefied gas fuel tank is provided inside the liquid fuel tank,
The liquefied gas fuel tank is configured as a pressure vessel,
Return fuel from the fuel injection path of the internal combustion engine is guided to the liquid fuel tank,
The liquefied gas fuel is vaporized inside the liquefied gas fuel tank by heating the liquefied gas fuel tank with the amount of heat of the return fuel,
From the liquefied gas fuel tank, the vaporized liquefied gas fuel is sent out.
A fuel tank for an internal combustion engine. 液化ガス燃料と液体燃料とを燃料とする内燃機関において、
前記液化ガス燃料のタンクを、前記液体燃料のタンクの内部に設け、
前記液化ガス燃料のタンクを、耐圧容器として構成し、
前記液体燃料のタンクには、前記内燃機関を冷却して加熱された冷却水、又は、前記内燃機関の排気ガスを導き、
前記冷却水又は前記排気ガスの熱量により、前記液化ガス燃料のタンクを加熱することによって、前記液化ガス燃料のタンクの内部で、前記液化ガス燃料を気化し、
前記液化ガス燃料のタンクから、気化した液化ガス燃料を送出する、
内燃機関の燃料タンク。 In an internal combustion engine that uses liquefied gas fuel and liquid fuel as fuel,
The liquefied gas fuel tank is provided inside the liquid fuel tank,
The liquefied gas fuel tank is configured as a pressure vessel,
In the liquid fuel tank, cooling water heated by cooling the internal combustion engine or exhaust gas of the internal combustion engine is guided,
The liquefied gas fuel is vaporized inside the liquefied gas fuel tank by heating the liquefied gas fuel tank by the amount of heat of the cooling water or the exhaust gas,
From the liquefied gas fuel tank, the vaporized liquefied gas fuel is sent out.
A fuel tank for an internal combustion engine. 液化ガス燃料と液体燃料とを燃料とする内燃機関において、
前記液化ガス燃料のタンクを、前記液体燃料のタンクの内部に設け、
前記液化ガス燃料のタンクを、耐圧容器として構成し、
前記液体燃料のタンクには、前記内燃機関の燃料噴射経路からのリターン燃料、前記内燃機関を冷却して加熱された冷却水、前記内燃機関の排気ガスのうち、２つ以上を導き、前記リターン燃料、前記冷却水、前記排気ガスの熱量のうち、２つ以上の組み合わせにより、前記液化ガス燃料のタンクを加熱することによって、前記液化ガス燃料のタンクの内部で、前記液化ガス燃料を気化し、
前記液化ガス燃料のタンクから、気化した液化ガス燃料を送出する、
内燃機関の燃料タンク。 In an internal combustion engine that uses liquefied gas fuel and liquid fuel as fuel,
The liquefied gas fuel tank is provided inside the liquid fuel tank,
The liquefied gas fuel tank is configured as a pressure vessel,
Two or more of return fuel from the fuel injection path of the internal combustion engine, cooling water heated by cooling the internal combustion engine, and exhaust gas of the internal combustion engine are led to the liquid fuel tank, and the return The liquefied gas fuel is vaporized inside the liquefied gas fuel tank by heating the liquefied gas fuel tank with a combination of two or more of the heat amounts of the fuel, the cooling water, and the exhaust gas. ,
From the liquefied gas fuel tank, the vaporized liquefied gas fuel is sent out.
A fuel tank for an internal combustion engine. 前記気化した液化ガス燃料の圧力を利用して、前記液化ガス燃料のタンクから、液体の液化ガス燃料を送出する、請求項１から３のいずれか１項に記載の内燃機関の燃料タンク。   The fuel tank for an internal combustion engine according to any one of claims 1 to 3, wherein liquid liquefied gas fuel is delivered from the liquefied gas fuel tank using the pressure of the vaporized liquefied gas fuel. 前記液化ガス燃料のタンク内の燃料の温度又は圧力を検出する、温度センサー又は圧力センサーを備える、請求項１から４のいずれか１項に記載の内燃機関の燃料タンク。   The fuel tank of the internal combustion engine according to any one of claims 1 to 4, further comprising a temperature sensor or a pressure sensor that detects a temperature or a pressure of the fuel in the tank of the liquefied gas fuel. 前記液化ガス燃料のタンク内の燃料の温度又は圧力が、所定値以下の場合には、前記液体燃料を前記内燃機関に供給する、
請求項１から５のいずれか１項に記載の内燃機関の燃料タンク。 When the temperature or pressure of the fuel in the liquefied gas fuel tank is equal to or lower than a predetermined value, the liquid fuel is supplied to the internal combustion engine.
The fuel tank of the internal combustion engine according to any one of claims 1 to 5. 請求項１から６のいずれか１項に記載の内燃機関の燃料タンクを備える、車両。   A vehicle comprising the fuel tank of the internal combustion engine according to any one of claims 1 to 6.
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WO2024166457A1 (en) * 2023-02-09 2024-08-15 三菱重工エンジン＆ターボチャージャ株式会社 Ammonia gas supply system and internal combustion engine system

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