JP4138395B2 - Liquefied gas fuel supply device - Google Patents

Liquefied gas fuel supply device Download PDF

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Publication number
JP4138395B2
JP4138395B2 JP2002232114A JP2002232114A JP4138395B2 JP 4138395 B2 JP4138395 B2 JP 4138395B2 JP 2002232114 A JP2002232114 A JP 2002232114A JP 2002232114 A JP2002232114 A JP 2002232114A JP 4138395 B2 JP4138395 B2 JP 4138395B2
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JP
Japan
Prior art keywords
fuel
pressure
pipe
liquefied gas
tank
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Expired - Fee Related
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JP2002232114A
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Japanese (ja)
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JP2004036599A (en
Inventor
睦 辻野
房治 大村
佐藤　　亨
利成 斉木
光宣 内田
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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
    • 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
    • Y02T10/40—Engine management systems

Description

【０００１】
【発明の属する技術分野】
本発明は内燃機関の液化ガス燃料供給装置に関し、詳しくは、デリバリパイプ内の圧力および燃料タンク内の圧力から燃料パイプ系の漏洩を検知して燃料を遮断する液化ガス燃料供給装置に関するものである。
【０００２】
【従来の技術】
燃料タンク内に貯蔵されたＬＰＧ等の液化ガス燃料を加圧してデリバリパイプに送り、デリバリパイプに設けられたインジェクタにより噴射してエンジンに供給する液化ガス燃料供給装置については、特表平６−５０２４７３号公報等で公知である。前記公報によれば、タンク内に貯蔵され且つタンク内で周囲温度に左右される可変の蒸気圧を有する燃料を、タンクでの可変蒸気圧より一定差圧高い圧力に維持される絶対圧で燃料を燃料流入側レール（デリバリパイプ）およびインジェクタに圧送し、燃料の絶対圧を監視し、他の通常のエンジンパラメータと共に燃料の絶対圧によって燃料噴射パルス幅を変化させるとしている。
【０００３】
【発明が解決しようとする課題】
しかしながら、前記公報に開示された構成においては、プレッシャレギュレータがデリバリパイプ近傍に配設されているため、万一、燃料配管中、特にプレッシャレギュレータの下流（タンク側）において漏洩があった場合には、圧力低下による検知ができなくエンジンも回り続けるので危険性が増大する。特に、燃料が液化ガス燃料である場合は、漏洩部の目視による確認もできないので危険性が増大する。そこで本発明は、万一、燃料配管中に漏洩が生じた場合でも容易に検知でき、供給路を遮断して燃料タンク内の燃料をそれ以上外部に漏洩させないようにすることができる液化ガス燃料供給装置を提供することを課題とするものである。
【０００４】
【課題を解決するための手段】
前記課題の解決を目的としてなされた請求項１の発明は、燃料タンク内の液化ガス燃料をフューエルポンプにより加圧してデリバリパイプに送り、前記デリバリパイプに設けられたインジェクタによりエンジンに燃料を供給するとともに、プレッシャレギュレータにより燃料配管内の圧力を調圧した後、余剰燃料を前記燃料タンクに戻すよう構成された液化ガス燃料供給装置において、前記燃料配管内の燃料圧力と前記燃料タンク内の圧力との圧力差が所定値よりも小さくなったとき、または、単位時間当たりの圧力差低下が所定値以上となったとき、前記燃料配管の故障と診断して前記フューエルポンプの作動を停止することを特徴とする。このように構成することにより燃料配管中の故障を検知して、燃料タンク内の燃料の外部への漏洩を防止することができる。
【０００５】
また、請求項２の発明は、燃料タンク内の液化ガス燃料をフューエルポンプにより加圧してデリバリパイプに送り、前記デリバリパイプに設けられたインジェクタによりエンジンに燃料を供給するとともに、プレッシャレギュレータにより燃料配管内の圧力を調圧した後、余剰燃料を前記燃料タンクに戻すよう構成された液化ガス燃料供給装置において、前記フルッシャレギュレータを前記燃料配管の下流端に装着して前記燃料タンク内に配設するとともに、前記燃料配管内の燃料圧力と前記燃料タンク内の燃料圧力との圧力差が所定値よりも小さくなったとき、または、単位時間当たりの圧力差低下が所定値以上となったとき、前記燃料配管の故障と判断してフューエルポンプの作動を停止するとともに、タンク遮断弁およびデリバリ遮断弁を閉じて前記燃料タンクからの燃料供給を遮断することを特徴とする。このように構成することにより請求項１の作用・効果に加えて、全燃料配管中の故障を検知することが可能となる。
【０００６】
【発明の実施の形態】
本発明の望ましい実施形態について図面を参照して説明する。図１は本発明の一実施形態に係る液化ガス燃料供給装置の概念図である。図１において、液化ガス燃料１を収容する燃料タンク２には、燃料を注入するための充填ユニット３、燃料量を表示するためのレベルケージ４、燃料タンク２内の燃料圧力を検知するためのタンク燃圧センサ５、燃料を加圧してデリバリパイプ６に圧送するためのフューエルポンプ７、デリバリパイプ６内の燃料圧力を調整するためのプレッシャレギュレータ８がそれぞれ装着されている。フューエルポンプ７の先には燃料供給管１２が連結されインテークマニホールド１３に固定されたデリバリパイプ６に連通されている。
【０００７】
燃料供給管１２の途中の燃料タンク２出口近傍にはタンク遮断弁１４が設けられ、ＥＣＵ（１１）からの電気信号により開閉される。タンク燃圧センサ５はエンジン１０を制御するためのＥＣＵ（１１）に接続されている。燃料供給管１２の途中のデリバリパイプ６近傍にはデリバリ遮断弁１５が設けられ、同じくＥＣＵ（１１）からの電気信号により開閉される。デリバリパイプ６とインテークマニホールド１３との間には複数のインジェクタ１６が挟持され、ＥＣＵ（１１）からの電気信号によりデリバリパイプ６内の燃料をエンジン１０に噴射するよう構成されている。燃料配管を構成するデリバリパイプ６にはデリバリパイプ６内の燃料圧力を検知するための燃圧センサ１７が設けられている。燃圧センサ１７はＥＣＵ（１１）に接続されている。なお、燃圧センサ１７は本実施例においてはデリバリパイプ６に設けられているが、燃料供給管１２またはリターンパイプ１９に設けてもよく、同様の作用・効果を生ずる。
【０００８】
デリバリパイプ６の出口には燃料配管の一部を構成するリターンパイプ１９が連結され、燃料タンク２の上部に連通されている。リターンパイプ１９途中のデリバリパイプ６近傍には第１の逆止弁２０が設けられリターンパイプ１９からの逆流を阻止するよう構成されている。リターンパイプ１９途中の燃料タンク２近傍には第２の逆止弁２１が設けられ、燃料タンク２からの逆流を阻止するよう構成されている。燃料タンク２内のリターンパイプ１９の終端にはプレッシャレギュレータ８が設けられ、デリバリパイプ６内の燃料圧力を調整するよう構成されている。調整による余剰燃料はプレッシャレギュレータ８から直接燃料タンク２内に流出するよう構成されている。なお、燃料供給管１２、デリバリパイプ６、リターンパイプ１９で燃料配管を構成している。
【０００９】
次に、本実施形態の作用について図１、図２を参照して説明する。図２は本実施形態の配管漏洩検知時の制御フローチャートである。不図示のイグニッションスイッチがＯＮになるとタンク遮断弁１４およびデリバリ遮断弁１５が開くとともにフューエルポンプ７が作動し液化ガス燃料１を所定圧力だけ加圧してデリバリパイプ６に圧送する。デリバリパイプ６を通過した燃料は第１および第２の逆止弁２０，２１を経てプレッシャレギュレータ８に達し、調圧された後余剰燃料はプレッシャレギュレータ８から排出されて燃料タンク２内に流出する。こうしてデリバリパイプ６内およびリターンパイプ１９内等の全燃料配管中の圧力は燃料タンク２内圧力よりも所定圧力だけ高い状態に保持される。
【００１０】
ＥＣＵ（１１）からの電気的信号によりインジェクタ１６が作動し、デリバリパイプ６内の燃料をエンジン１０のインテークマニホールド１３内に噴射してエンジン１０を作動させる。フューエルポンプ７の作動中は、タンク燃圧センサ５および燃圧センサ１７によりタンク圧力（Ｐｔ）およびデリバリ圧力（Ｐｄ）が所定時間ごとにサンプリングされＥＣＵ（１１）で処理される。万一、リターンパイプ１９から燃料が漏洩した場合は、後述する制御ロジックにより漏洩を検知しフューエルポンプ７の作動を停止させるとともにタンク遮断弁１４およびデリバリ遮断弁１５を閉じて燃料の供給を停止させる。
【００１１】
図２のフローチャートを参照して上述の制御ロジックについて説明する。不図示のイグニッションスイッチがＯＮになるとステップ（以下Ｓと記す）１００においてフューエルポンプ７が駆動され、タンク遮断弁１４およびデリバリ遮断弁１５の両遮断弁が開弁され、燃料タンク２内の液化ガス燃料１がデリバリパイプ６等に圧送される。次いで、Ｓ１０１においてタンク圧力（Ｐｔ）およびデリバリ圧力（Ｐｄ）がサンプリングされてＥＣＵ（１１）内のメモリに記憶される。
【００１２】
Ｓ１０２においてデリバリ圧力（Ｐｄ）とタンク圧力（Ｐｔ）との差圧（Ｐｄ−Ｐｔ）が所定圧力、例えば、０．３５ＭＰａより少ない場合、あるいは差圧（Ｐｄ−Ｐｔ）の変化量ｄ（Ｐｄ−Ｐｔ）／ｄｔが所定変化量、例えば、０．１ＭＰａ／ｍｓｅｃより多い場合には、配管途中に漏洩があったと判断しＳ１０３に進む。また、条件が不成立の場合にはＳ１０１に戻って燃料タンク圧力（Ｐｔ）等のサンプリングを再度行う。Ｓ１０３において、フューエルポンプ７を停止させるとともに遮断弁１４，１５を閉弁させて制御を終了する。
【００１３】
【発明の効果】
本発明は上述のように構成されているので以下の効果を奏する。すなわち、請求項１の発明においては、燃料配管内の燃料圧力と燃料タンク内の圧力との圧力差が所定値よりも小さくなったとき、または、単位時間当たりの圧力差低下が所定値以上となったとき、燃料配管の故障と診断してフューエルポンプの作動を停止するように構成したので、燃料配管が損傷しても故障を検知することができ、燃料タンク内の燃料の外部への漏洩を防止することができる。また、請求項２の発明においては、プレッシャレギュレータを燃料配管の下流端に装着して燃料タンク内に配設するとともに、燃料配管内の燃料圧力と燃料タンク内の燃料圧力との圧力差が所定値よりも小さくなったとき、または、単位時間当たりの圧力差低下が所定値以上となったとき、燃料配管の故障（漏洩）と判断してタンク遮断弁およびデリバリ遮断弁を閉じて燃料タンクからの燃料供給を遮断するようにしたので、燃料供給管やデリバリパイプだけでなく万一事故によりリターンパイプを含む燃料配管中の各部が損傷しても故障を検知することができ、燃料タンク内の燃料の漏洩の防止を確実に向上させることができる。
【図面の簡単な説明】
【図１】本発明の一実施形態に係る液化ガス燃料供給装置の概念図である。
【図２】本発明の一実施形態に係る液化ガス燃料供給装置の制御ロジックを示すフローチャートである。
【符号の説明】
１ 液化ガス燃料
２ 燃料タンク
５ タンク燃圧センサ
６ デリバリパイプ（燃料配管）
７ フューエルポンプ
８ プレッシャレギュレータ
１０ エンジン
１４ タンク遮断弁
１５ デリバリ遮断弁
１６ インジェクタ
１７ 燃圧センサ
１９ リターンパイプ（燃料配管）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquefied gas fuel supply apparatus for an internal combustion engine, and more particularly, to a liquefied gas fuel supply apparatus that detects fuel pipe system leakage from the pressure in a delivery pipe and the pressure in a fuel tank and shuts off the fuel. .
[0002]
[Prior art]
Regarding a liquefied gas fuel supply device that pressurizes liquefied gas fuel such as LPG stored in a fuel tank, sends it to a delivery pipe, and injects it by an injector provided in the delivery pipe and supplies it to an engine, No. 502473 and the like. According to the publication, the fuel having a variable vapor pressure stored in the tank and depending on the ambient temperature in the tank is fueled at an absolute pressure that is maintained at a pressure higher than the variable vapor pressure in the tank by a certain differential pressure. Is pumped to the fuel inflow side rail (delivery pipe) and the injector, the absolute pressure of the fuel is monitored, and the fuel injection pulse width is changed by the absolute pressure of the fuel together with other normal engine parameters.
[0003]
[Problems to be solved by the invention]
However, in the configuration disclosed in the above publication, since the pressure regulator is disposed in the vicinity of the delivery pipe, in the unlikely event that there is a leak in the fuel pipe, particularly downstream (tank side) of the pressure regulator. The danger increases because the engine continues to run because it cannot be detected due to a pressure drop. In particular, when the fuel is a liquefied gas fuel, since the leakage part cannot be visually confirmed, the danger increases. Accordingly, the present invention provides a liquefied gas fuel that can be easily detected even in the event that a leak occurs in the fuel pipe, and that the fuel in the fuel tank can be prevented from leaking further outside by blocking the supply path. It is an object to provide a supply device.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 is that the liquefied gas fuel in the fuel tank is pressurized by a fuel pump and sent to the delivery pipe, and the fuel is supplied to the engine by the injector provided in the delivery pipe. In addition, in the liquefied gas fuel supply apparatus configured to return the surplus fuel to the fuel tank after adjusting the pressure in the fuel pipe by a pressure regulator, the fuel pressure in the fuel pipe, the pressure in the fuel tank, When the pressure difference of the fuel pipe becomes smaller than a predetermined value, or when the pressure difference drop per unit time becomes a predetermined value or more, it is diagnosed that the fuel pipe is faulty and the operation of the fuel pump is stopped. Features. With this configuration, it is possible to detect a failure in the fuel pipe and prevent leakage of the fuel in the fuel tank to the outside.
[0005]
According to a second aspect of the present invention, liquefied gas fuel in a fuel tank is pressurized by a fuel pump and sent to a delivery pipe, fuel is supplied to the engine by an injector provided in the delivery pipe, and fuel piping is provided by a pressure regulator. In the liquefied gas fuel supply device configured to return surplus fuel to the fuel tank after adjusting the pressure inside the fuel tank, the flusher regulator is attached to the downstream end of the fuel pipe and disposed in the fuel tank. And when the pressure difference between the fuel pressure in the fuel pipe and the fuel pressure in the fuel tank becomes smaller than a predetermined value, or when the pressure difference decrease per unit time becomes a predetermined value or more, The fuel pump is judged to have failed and the fuel pump is stopped. CLOSING characterized by interrupting the fuel supply from the fuel tank. With this configuration, in addition to the operation and effect of the first aspect, it becomes possible to detect a failure in all the fuel pipes.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram of a liquefied gas fuel supply apparatus according to an embodiment of the present invention. In FIG. 1, a fuel tank 2 containing liquefied gas fuel 1 has a filling unit 3 for injecting fuel, a level cage 4 for displaying the amount of fuel, and a fuel pressure in the fuel tank 2 for detecting the fuel pressure. A tank fuel pressure sensor 5, a fuel pump 7 for pressurizing and feeding fuel to the delivery pipe 6, and a pressure regulator 8 for adjusting the fuel pressure in the delivery pipe 6 are mounted. A fuel supply pipe 12 is connected to the tip of the fuel pump 7 and communicates with a delivery pipe 6 fixed to an intake manifold 13.
[0007]
A tank shutoff valve 14 is provided near the outlet of the fuel tank 2 in the middle of the fuel supply pipe 12 and is opened and closed by an electrical signal from the ECU (11). The tank fuel pressure sensor 5 is connected to an ECU (11) for controlling the engine 10. A delivery shut-off valve 15 is provided in the vicinity of the delivery pipe 6 in the middle of the fuel supply pipe 12, and is also opened and closed by an electrical signal from the ECU (11). A plurality of injectors 16 are sandwiched between the delivery pipe 6 and the intake manifold 13, and the fuel in the delivery pipe 6 is injected into the engine 10 by an electrical signal from the ECU (11). The delivery pipe 6 constituting the fuel pipe is provided with a fuel pressure sensor 17 for detecting the fuel pressure in the delivery pipe 6. The fuel pressure sensor 17 is connected to the ECU (11). Although the fuel pressure sensor 17 is provided in the delivery pipe 6 in the present embodiment, it may be provided in the fuel supply pipe 12 or the return pipe 19 and produces the same operation and effect.
[0008]
A return pipe 19 constituting a part of the fuel pipe is connected to the outlet of the delivery pipe 6 and communicates with the upper part of the fuel tank 2. A first check valve 20 is provided in the vicinity of the delivery pipe 6 in the middle of the return pipe 19 so as to prevent backflow from the return pipe 19. A second check valve 21 is provided in the vicinity of the fuel tank 2 in the middle of the return pipe 19 so as to prevent backflow from the fuel tank 2. A pressure regulator 8 is provided at the end of the return pipe 19 in the fuel tank 2 so as to adjust the fuel pressure in the delivery pipe 6. Excess fuel resulting from the adjustment is configured to flow directly into the fuel tank 2 from the pressure regulator 8. The fuel supply pipe 12, the delivery pipe 6, and the return pipe 19 constitute a fuel pipe.
[0009]
Next, the effect | action of this embodiment is demonstrated with reference to FIG. 1, FIG. FIG. 2 is a control flowchart at the time of pipe leakage detection according to this embodiment. When an ignition switch (not shown) is turned ON, the tank shutoff valve 14 and the delivery shutoff valve 15 are opened and the fuel pump 7 is operated to pressurize the liquefied gas fuel 1 by a predetermined pressure and pump it to the delivery pipe 6. The fuel that has passed through the delivery pipe 6 reaches the pressure regulator 8 via the first and second check valves 20 and 21, and after the pressure adjustment, the surplus fuel is discharged from the pressure regulator 8 and flows out into the fuel tank 2. . In this way, the pressure in all the fuel pipes such as the delivery pipe 6 and the return pipe 19 is kept higher than the pressure in the fuel tank 2 by a predetermined pressure.
[0010]
The injector 16 is operated by an electrical signal from the ECU (11), and the fuel in the delivery pipe 6 is injected into the intake manifold 13 of the engine 10 to operate the engine 10. While the fuel pump 7 is in operation, the tank fuel pressure sensor 5 and the fuel pressure sensor 17 sample the tank pressure (Pt) and delivery pressure (Pd) every predetermined time and process them by the ECU (11). In the unlikely event that fuel leaks from the return pipe 19, the leak is detected by a control logic, which will be described later, and the operation of the fuel pump 7 is stopped and the tank shutoff valve 14 and the delivery shutoff valve 15 are closed to stop the fuel supply. .
[0011]
The above control logic will be described with reference to the flowchart of FIG. When an ignition switch (not shown) is turned ON, the fuel pump 7 is driven in step (hereinafter referred to as S) 100, both the tank cutoff valve 14 and the delivery cutoff valve 15 are opened, and the liquefied gas in the fuel tank 2 is opened. The fuel 1 is pumped to the delivery pipe 6 or the like. Next, in S101, the tank pressure (Pt) and the delivery pressure (Pd) are sampled and stored in the memory in the ECU (11).
[0012]
In S102, when the differential pressure (Pd−Pt) between the delivery pressure (Pd) and the tank pressure (Pt) is less than a predetermined pressure, for example, 0.35 MPa, or the change amount d (Pd−Pt) of the differential pressure (Pd−Pt). If Pt) / dt is greater than a predetermined change amount, for example, 0.1 MPa / msec, it is determined that there is a leak in the middle of the piping, and the process proceeds to S103. If the condition is not satisfied, the process returns to S101 and the fuel tank pressure (Pt) and the like are sampled again. In S103, the fuel pump 7 is stopped and the shutoff valves 14 and 15 are closed, and the control is terminated.
[0013]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects. That is, in the invention of claim 1, when the pressure difference between the fuel pressure in the fuel pipe and the pressure in the fuel tank becomes smaller than a predetermined value, or the pressure difference decrease per unit time is not less than a predetermined value. When the fuel pipe becomes faulty, the fuel pump is diagnosed as having a fault and the fuel pump is stopped. Therefore, even if the fuel pipe is damaged, the fault can be detected and the fuel in the fuel tank leaks to the outside. Can be prevented. In the invention of claim 2, the pressure regulator is mounted at the downstream end of the fuel pipe and disposed in the fuel tank, and the pressure difference between the fuel pressure in the fuel pipe and the fuel pressure in the fuel tank is predetermined. When the pressure difference is lower than the value or when the pressure difference drop per unit time exceeds the specified value, it is judged that the fuel pipe has failed (leakage) and the tank shutoff valve and delivery shutoff valve are closed and the fuel tank is closed. The fuel supply is cut off, so that not only the fuel supply pipe and delivery pipe but also each part in the fuel pipe including the return pipe is damaged due to an accident. The prevention of fuel leakage can be reliably improved.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a liquefied gas fuel supply apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a control logic of the liquefied gas fuel supply apparatus according to the embodiment of the present invention.
[Explanation of symbols]
1 liquefied gas fuel 2 fuel tank 5 tank fuel pressure sensor 6 delivery pipe (fuel piping)
7 Fuel pump 8 Pressure regulator 10 Engine 14 Tank shutoff valve 15 Delivery shutoff valve 16 Injector 17 Fuel pressure sensor 19 Return pipe (fuel piping)

Claims (2)

燃料タンク内の液化ガス燃料をフューエルポンプにより加圧してデリバリパイプに送り、前記デリバリパイプに設けられたインジェクタによりエンジンに燃料を供給するとともに、プレッシャレギュレータにより燃料配管内の圧力を調圧した後、余剰燃料を前記燃料タンクに戻すよう構成された液化ガス燃料供給装置において、
前記燃料配管内の燃料圧力と前記燃料タンク内の圧力との圧力差が所定値よりも小さくなったとき、または、単位時間当たりの圧力差低下が所定値以上となったとき、前記燃料配管からの前記液化ガス燃料の漏洩と診断して前記フューエルポンプの作動を停止することを特徴とする液化ガス燃料供給装置。After the liquefied gas fuel in the fuel tank is pressurized by a fuel pump and sent to a delivery pipe, fuel is supplied to the engine by an injector provided in the delivery pipe, and the pressure in the fuel pipe is regulated by a pressure regulator, In the liquefied gas fuel supply device configured to return surplus fuel to the fuel tank ,
When the pressure difference between the pressure in the fuel pressure and the fuel tank before Symbol fuel in the pipe is smaller than a predetermined value, or when the pressure differential decreases per unit time exceeds a predetermined value, the fuel pipe A liquefied gas fuel supply device characterized by diagnosing leakage of the liquefied gas fuel from the fuel pump and stopping the operation of the fuel pump. 燃料タンク内の液化ガス燃料をフューエルポンプにより加圧してデリバリパイプに送り、前記デリバリパイプに設けられたインジェクタによりエンジンに燃料を供給するとともに、プレッシャレギュレータにより燃料配管内の圧力を調圧した後、余剰燃料を前記燃料タンクに戻すよう構成された液化ガス燃料供給装置において、
前記プレッシャレギュレータを前記燃料配管の下流端に装着して前記燃料タンク内に配設するとともに、前記燃料配管内の燃料圧力と前記燃料タンク内の燃料圧力との圧力差が所定値よりも小さくなったとき、または、単位時間当たりの圧力差低下が所定値以上となったとき、前記燃料配管からの前記液化ガス燃料の漏洩と判断してフューエルポンプの作動を停止するとともに、タンク遮断弁およびデリバリ遮断弁を閉じて前記燃料タンクからの燃料供給を遮断することを特徴とする液化ガス燃料供給装置。After the liquefied gas fuel in the fuel tank is pressurized by a fuel pump and sent to a delivery pipe, fuel is supplied to the engine by an injector provided in the delivery pipe, and the pressure in the fuel pipe is regulated by a pressure regulator, In the liquefied gas fuel supply device configured to return surplus fuel to the fuel tank ,
Together arranged before Symbol the fuel tank the pressure regulator is attached to the downstream end of the fuel pipe, the pressure difference between the fuel pressure in the fuel pressure and the fuel tank in the fuel pipe is smaller than a predetermined value Or when the pressure difference drop per unit time becomes equal to or greater than a predetermined value, it is determined that the liquefied gas fuel has leaked from the fuel pipe, and the operation of the fuel pump is stopped. A liquefied gas fuel supply device characterized in that the delivery shutoff valve is closed to shut off the fuel supply from the fuel tank.
JP2002232114A 2002-07-05 2002-07-05 Liquefied gas fuel supply device Expired - Fee Related JP4138395B2 (en)

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KR100650933B1 (en) 2005-12-09 2006-11-30 르노삼성자동차 주식회사 Gas leaking monitoring device of lpli system
KR100749243B1 (en) 2006-06-30 2007-08-13 지멘스 오토모티브 주식회사 Method for diagonsing leakage of fuel supplying line for lpi car
KR100779840B1 (en) 2006-07-11 2007-11-29 지멘스 오토모티브 주식회사 Apparatus and method for diagonsing fuel supplying apparatus of lpi car
KR100799770B1 (en) 2006-08-31 2008-02-01 (주)모토닉 Gas feeding apparatus of gas fuel vehicles
KR101054046B1 (en) * 2008-11-27 2011-08-03 주식회사 케피코 How to check and handle the leakage of Elpia's vehicle
KR101480577B1 (en) * 2009-12-01 2015-01-09 현대자동차주식회사 Liquid Natural Gas supplying system and fuel leakage preventing method thereof
KR101765933B1 (en) 2011-06-10 2017-08-23 현대자동차주식회사 Fuel Pump Control Method for Vehicle

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