JP2005016504A - Fuel supply system for lpi engine - Google Patents

Fuel supply system for lpi engine Download PDF

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Publication number
JP2005016504A
JP2005016504A JP2003401955A JP2003401955A JP2005016504A JP 2005016504 A JP2005016504 A JP 2005016504A JP 2003401955 A JP2003401955 A JP 2003401955A JP 2003401955 A JP2003401955 A JP 2003401955A JP 2005016504 A JP2005016504 A JP 2005016504A
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fuel
pressure regulator
fine hole
supply system
fuel supply
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Hong Seok Choi
弘 錫 崔
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Hyundai Motor Co
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Hyundai Motor Co
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    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply system for an LPI engine capable of contributing reduction of external leak of a fuel and contaminant at start by discharging a fuel remaining inside a fuel supply line and fuel return line to a cylinder and preventing the fuel from leaking through an injector while the engine is stopped and cooled after operation. <P>SOLUTION: This system is composed of a fine hole constructed to bypass a pressure regulator provided in a fuel return line and a check valve provided to permit only the flow of the fuel from the fine hole toward the cylinder between the fine hole and the cylinder. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明はＬＰＩエンジン（ＬＰＩ：Ｌｉｑｕｅｆｉｅｄ Ｐｅｔｒｏｌｅｕｍ Ｉｎｊｅｃｔｉｏｎ）の燃料供給システムに関し、より詳しくは、車両の走行後でエンジン停止後に、エンジンが大気温と等しくなる間に燃料供給ライン上に存在する液状の燃料がインジェクタを通じて漏出することを防止する技術に関する。   The present invention relates to a fuel supply system of an LPI (Liquid Petroleum Injection), and more particularly, a liquid fuel that exists on a fuel supply line while the engine is equal to an atmospheric temperature after the engine is stopped after the vehicle travels. TECHNICAL FIELD The present invention relates to a technique for preventing leakage of water through an injector.

図１は従来のＬＰＩエンジンで使用されている燃料供給システムを示したものであり、ボンベ１００の内部には液状の燃料をポンピングするための燃料ポンプ１０２が装着されており、燃料ポンプ１０２からポンピングされた燃料はマルチバルブ１０４を通じて燃料供給ライン１０６に送られ、送られた燃料はインジェクタ１０８を通じてエンジンの燃焼室１１０に噴射され、余剰の燃料は燃料リターンライン１１２を通じてボンベ１００にリターンする。   FIG. 1 shows a fuel supply system used in a conventional LPI engine. A fuel pump 102 for pumping liquid fuel is installed in a cylinder 100, and pumping from the fuel pump 102 is performed. The supplied fuel is sent to the fuel supply line 106 through the multi-valve 104, the sent fuel is injected into the combustion chamber 110 of the engine through the injector 108, and surplus fuel returns to the cylinder 100 through the fuel return line 112.

一方、燃料供給ライン１０６にはエンジンの停止時に燃料の供給を遮断するための供給遮断バルブ１１４と、燃料の温度を測定するための温度センサ１１６、及び燃料から発生する気体を捕集して燃料の液状を維持するためのサービスバルブ１１８が設けられており、燃料リターンライン１１２には燃料の圧力を測定するための圧力センサ１２０と燃料の圧力を一定の水準に維持するための圧力調節機と１２２が設けられている。   On the other hand, the fuel supply line 106 includes a supply shutoff valve 114 for shutting off the fuel supply when the engine is stopped, a temperature sensor 116 for measuring the temperature of the fuel, and a gas generated from the fuel to collect the fuel. A service valve 118 for maintaining the liquid state of the fuel is provided. The fuel return line 112 includes a pressure sensor 120 for measuring the pressure of the fuel and a pressure regulator for maintaining the fuel pressure at a certain level. 122 is provided.

上記のような従来のＬＰＩエンジンの燃料供給システムは車両が走行を終えてエンジンを停止すると、供給遮断バルブ１１４がボンベ１００から燃料供給ライン１０６に燃料が供給されないように燃料を遮断し、圧力調節機１２２により燃料供給ライン１０６の供給遮断バルブ設置部から、燃料リターンライン１１２の圧力調節機設置部までの間の区間には圧力のかかった燃料が残留する。この残留燃料はエンジンが徐々に常温状態に冷めて行く間に圧力が上昇する事によりインジェクタ１０８を通じて燃焼室に漏洩するようになる。   In the conventional LPI engine fuel supply system as described above, when the vehicle finishes running and stops the engine, the supply shutoff valve 114 shuts off the fuel so that fuel is not supplied from the cylinder 100 to the fuel supply line 106, and the pressure is adjusted. The pressurized fuel remains in the section from the supply shutoff valve installation part of the fuel supply line 106 to the pressure regulator installation part of the fuel return line 112 by the machine 122. This residual fuel leaks into the combustion chamber through the injector 108 as the pressure rises while the engine is gradually cooled to room temperature.

上記のように燃焼室に漏洩した燃料が外部に漏れたり、エンジンの初期始動時に過度な汚染物質を排出するなどの問題点を発生する。
特許文献１にはインジェクタから漏れ出す燃料をなくす燃料噴射装置について述べられているが、本発明は、特許文献１で開示されている方法よりも簡易な構造で漏洩する燃料をなくすものである。
特開平６−１０８９４３号公報 As described above, problems such as the fuel leaking into the combustion chamber leaking to the outside and excessive pollutants being discharged at the initial start of the engine occur.
Although Patent Document 1 describes a fuel injection device that eliminates fuel leaking from an injector, the present invention eliminates fuel that leaks with a simpler structure than the method disclosed in Patent Document 1.
JP-A-6-108943

本発明は上記問題点を解決するために案出されたものであり、エンジンが作動後に停止して冷却する間に、燃料供給ライン及び燃料リターンライン内部に残留する燃料を、ボンベに排出できるようにすることにより、燃料がインジェクタを通して漏洩することを防止して、燃料の外部漏出及び始動時の汚染物質低減に寄与できるようにしたＬＰＩエンジンの燃料供給システムを提供することにその目的がある。   The present invention has been devised to solve the above-described problems, and allows fuel remaining in the fuel supply line and the fuel return line to be discharged into a cylinder while the engine is stopped and cooled after operation. Therefore, it is an object of the present invention to provide a fuel supply system for an LPI engine that prevents fuel from leaking through an injector and contributes to external leakage of fuel and reduction of pollutants at start-up.

上記のような目的を達成するための本発明は、燃料リターンラインに設けた圧力調節機をバイパスするように備えた微細孔と；前記微細孔とボンベとの間に前記微細孔からボンベに向かう燃料の流動だけ許容するように設けたチェックバルブと；を含んで構成する。   In order to achieve the above object, the present invention provides a fine hole provided so as to bypass a pressure regulator provided in a fuel return line; between the fine hole and the cylinder, the fine hole is directed to the cylinder. And a check valve provided to allow only fuel flow.

前記圧力調節機の調圧が３〜１０ｂａｒである場合、前記微細孔の直径は０．１〜０．５ｍｍ範囲以内であること、また、 前記微細孔は前記圧力調節機に形成され、圧力調節機の燃料流入側から燃料流出側に断面積が狭くなるテーパ部を備え、前記テーパ部と燃料流出側との間に微細孔を備えている。   When the pressure regulator has a pressure adjustment of 3 to 10 bar, the diameter of the micropore is within a range of 0.1 to 0.5 mm, and the micropore is formed in the pressure regulator to adjust the pressure. A taper portion having a narrow cross-sectional area is provided from the fuel inflow side to the fuel outflow side of the machine, and a fine hole is provided between the taper portion and the fuel outflow side.

前記テーパ部の入口にはフィルタをさらに備えて、前記フィルタは中央に濾過部を備え、前記濾過部の上下に挿入突起を備えて；前記圧力調節機には前記挿入突起を挿入する挿入溝を備える。   The inlet of the tapered portion further includes a filter, the filter includes a filtering portion at the center, and includes insertion protrusions above and below the filtering portion; the pressure regulator includes an insertion groove for inserting the insertion protrusion. Prepare.

本発明により、エンジンが作動後に停止して冷却する間に、燃料供給ライン及び燃料リターンライン内部に残留する燃料が圧力調節機をバイパスしてボンベに排出できるようにすることにより、燃料がインジェクタを通して漏洩することを防止して、燃料の外部漏出及び始動時の汚染物質低減に寄与できるようにし、エンジンの整備時に燃料の外部漏出量が顕著に低減することにより、優れた整備性を持つ効果を得ることができる。   The present invention allows fuel to pass through the injector by allowing the fuel remaining in the fuel supply line and the fuel return line to bypass the pressure regulator and be discharged into the cylinder while the engine is stopped and cooled after operation. Prevents leakage and contributes to the external leakage of fuel and the reduction of pollutants at start-up, and significantly reduces the amount of external leakage of fuel during engine maintenance, resulting in excellent maintainability. Obtainable.

以下、本発明の好ましい実施例を添付図にて詳述する。
図２は本発明によるＬＰＩエンジンの燃料供給システムの一実施例を示したものであり、燃料リターンライン１に圧力調節機３を設けており、圧力調節機３には圧力調節機３をバイパスするように微細孔５を備えており、微細孔５とボンベとの間に微細孔５からボンベに向かう燃料の流動だけ許容し、その反対方向の流動は遮断するチェックバルブ７を設けている。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 2 shows an embodiment of a fuel supply system for an LPI engine according to the present invention. A pressure regulator 3 is provided in the fuel return line 1, and the pressure regulator 3 is bypassed in the pressure regulator 3. In this way, a check valve 7 is provided between the micro hole 5 and the cylinder so as to allow only the flow of fuel from the micro hole 5 toward the cylinder and block the flow in the opposite direction.

微細孔５の直径は、圧力調節機３の調圧が３〜１０ｂａｒの場合０．１〜０．５ｍｍの範囲内に設定する。特に圧力調節機３の調圧が５ｂａｒである場合を基準にすると微細孔５の直径は０．２〜０．４ｍｍ範囲以内にすることが好ましい。
これは圧力調節機３の調圧が５ｂａｒの状態で、微細孔５の直径が０．２ｍｍより小さい場合には、微細孔５が詰まる現象が頻繁に生ずるようになる問題が発生し、微細孔５の直径が０．４ｍｍ以上である場合には圧力調節機３が正常に機能しなくなるためである。 The diameter of the fine hole 5 is set within a range of 0.1 to 0.5 mm when the pressure regulator 3 has a pressure adjustment of 3 to 10 bar. In particular, on the basis of the case where the pressure regulation of the pressure regulator 3 is 5 bar, the diameter of the micropores 5 is preferably within a range of 0.2 to 0.4 mm.
This is because when the pressure of the pressure regulator 3 is 5 bar and the diameter of the fine hole 5 is smaller than 0.2 mm, a problem that the fine hole 5 is frequently clogged occurs. This is because the pressure regulator 3 does not function normally when the diameter of 5 is 0.4 mm or more.

圧力調節機３に微細孔５を形成する具体的な構造を図２（Ｂ）、（Ｃ）に示す。圧力調節機３の燃料流入側から燃料流出側に向けて断面積が狭くなるテーパ部９を備え、テーパ部９と燃料流出側との間に微細孔５を備えた構造を持つ。
さらに、テーパ部９の入口にはフィルタ１１を備えて微細孔５が燃料中の異物により詰まるのを防止するようにしている。フィルタ１１は中央に濾過部１７を備え、濾過部１７は上下に挿入突起１３を備え、圧力調節機３には挿入突起１３を挿入するための挿入溝１５を備え、フィルタ１１を若干曲げて挿入突起１３が挿入溝１５に差し込むことでフィルタ１１を装着する。図３に濾過部１７の正面図（Ａ）、側面図（Ｂ）を示す。 A specific structure for forming the fine hole 5 in the pressure regulator 3 is shown in FIGS. The pressure regulator 3 includes a tapered portion 9 having a cross-sectional area that narrows from the fuel inflow side to the fuel outflow side, and has a structure in which the fine hole 5 is provided between the taper portion 9 and the fuel outflow side.
Further, a filter 11 is provided at the inlet of the taper portion 9 to prevent the fine holes 5 from being clogged with foreign matters in the fuel. The filter 11 is provided with a filtering part 17 at the center, the filtering part 17 is provided with insertion protrusions 13 on the upper and lower sides, the pressure regulator 3 is provided with an insertion groove 15 for inserting the insertion protrusions 13, and the filter 11 is slightly bent and inserted. The filter 11 is mounted by inserting the protrusion 13 into the insertion groove 15. FIG. 3 shows a front view (A) and a side view (B) of the filtration unit 17.

ここで、フィルタ１１の設置位置を上記のようにテーパ部９の入口としているのは、フィルタ１１が微細孔５に近い所に設置されれば、フィルタ１１の大きさがあまりにも小くなり異物により非常に簡単にフィルタ１１が詰まる問題点を避けるためである。
フィルタ１１を燃料リターンライン１の圧力調節機３の入口に設けることにより、リターンするすべての燃料がこのフィルタ１１を通過するので、フィルタ１１が詰まり、適正な燃料圧形成に影響を与えることを防止するためである。 Here, the installation position of the filter 11 is used as the entrance of the taper portion 9 as described above. If the filter 11 is installed near the fine hole 5, the size of the filter 11 becomes too small, and the foreign matter. This is to avoid the problem that the filter 11 is clogged very easily.
By providing the filter 11 at the inlet of the pressure regulator 3 in the fuel return line 1, all the returning fuel passes through the filter 11, thereby preventing the filter 11 from being clogged and affecting proper fuel pressure formation. It is to do.

上記のように圧力調節機３をバイパスする微細孔５を具備することにより、エンジンの作動時には圧力調節機３が燃料リターンライン１の燃料圧を適切に調節する作用をする間、微細孔５を通じて燃料が流動してもインジェクタに供給する適正燃料圧を形成することには影響を与えないが、エンジンが停止した後では微細孔５を通じて供給遮断バルブと圧力調節機３との間の燃料が圧力調節機３をバイパスしてボンベにドレインさせるようになるため、燃料がインジェクタを通じて漏出する現象が発生しなくなる。   By providing the fine hole 5 that bypasses the pressure regulator 3 as described above, the pressure regulator 3 can appropriately adjust the fuel pressure of the fuel return line 1 when the engine is operated. Even if the fuel flows, it does not affect the formation of an appropriate fuel pressure to be supplied to the injector. However, after the engine is stopped, the fuel between the supply cutoff valve and the pressure regulator 3 is pressurized through the microhole 5. Since the regulator 3 is bypassed and drained to the cylinder, the phenomenon of fuel leaking through the injector does not occur.

バイパスする燃料は、フィルタ１１を通過することで濾過されるので、微細孔５が異物により簡単に詰まるのを防止するようになり、チェックバルブ７はボンベ側から燃料が微細孔５を通じて逆流するのを防止する機能をする。   Since the fuel to be bypassed is filtered by passing through the filter 11, the fine holes 5 are prevented from being easily clogged with foreign matters, and the check valve 7 causes the fuel to flow backward from the cylinder side through the fine holes 5. The function to prevent.

従来技術によるＬＰＩエンジンの燃料供給システムを示した構成図である。1 is a configuration diagram showing a fuel supply system for an LPI engine according to the prior art. 本発明によるＬＰＩエンジンの燃料供給システムの一実施例を示したものであって圧力調節機部分を示した断面図である。1 is a sectional view showing an embodiment of a fuel supply system for an LPI engine according to the present invention and showing a pressure regulator portion; 図２のフィルタを示した図面である。3 is a diagram illustrating the filter of FIG. 2.

符号の説明Explanation of symbols

１ 燃料リターンライン
３ 圧力調節機
５ 微細孔
７ チェックバルブ
９ テーパ部
１１ フィルタ
１３ 挿入突起
１５ 挿入溝
１７ 濾過部 DESCRIPTION OF SYMBOLS 1 Fuel return line 3 Pressure regulator 5 Fine hole 7 Check valve 9 Tapered part 11 Filter 13 Insertion protrusion 15 Insertion groove 17 Filtration part

Claims (5)

燃料リターンラインに設けた圧力調節機をバイパスするように備えた微細孔と；
前記微細孔とボンベとの間に前記微細孔からボンベに向かう燃料の流動だけ許容するように設けたチェックバルブと；
を含んで構成されたことを特徴とするＬＰＩエンジンの燃料供給システム。 Micropores provided to bypass the pressure regulator provided in the fuel return line;
A check valve provided between the fine hole and the cylinder so as to allow only a flow of fuel from the fine hole toward the cylinder;
A fuel supply system for an LPI engine, comprising: 前記圧力調節機の調圧が３〜１０ｂａｒである場合、前記微細孔の直径は０．１〜０．５ｍｍ範囲以内であることを特徴とする請求項１に記載のＬＰＩエンジンの燃料供給システム。   2. The fuel supply system for an LPI engine according to claim 1, wherein when the pressure regulator has a pressure adjustment of 3 to 10 bar, the diameter of the fine hole is within a range of 0.1 to 0.5 mm. 前記微細孔は前記圧力調節機に形成され、圧力調節機の燃料流入側から燃料流出側に断面積が狭くなるテーパ部を備え、前記テーパ部と燃料流出側との間に微細孔が備えていることを特徴とする請求項１に記載のＬＰＩエンジンの燃料供給システム。   The fine hole is formed in the pressure regulator, and includes a tapered portion whose cross-sectional area is narrowed from the fuel inflow side to the fuel outflow side of the pressure regulator, and the fine hole is provided between the taper portion and the fuel outflow side. The fuel supply system for an LPI engine according to claim 1, wherein: 前記テーパ部の入口には、フィルタをさらに備えていることを特徴とする請求項３に記載のＬＰＩエンジンの燃料供給システム。   The LPI engine fuel supply system according to claim 3, further comprising a filter at an inlet of the tapered portion. 前記フィルタは中央に濾過部を備え、前記濾過部の上下に挿入突起を備えて；
前記圧力調節機には前記挿入突起を挿入する挿入溝を備えていることを特徴とする請求項４に記載のＬＰＩエンジンの燃料供給システム。 The filter has a filtration part in the center, and has insertion protrusions above and below the filtration part;
The LPI engine fuel supply system according to claim 4, wherein the pressure regulator includes an insertion groove into which the insertion protrusion is inserted.
JP2003401955A 2003-06-27 2003-12-01 Fuel supply system for lpi engine Pending JP2005016504A (en)

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AU2006201758B2 (en) * 2005-06-30 2008-04-10 Hyundai Motor Company Fuel Supply System for Liquified Petroleum Gas Injection (LPI) Engine

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KR20040054881A (en) * 2002-12-18 2004-06-26 현대자동차주식회사 fuel feeding system for an LPI engine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2006201758B2 (en) * 2005-06-30 2008-04-10 Hyundai Motor Company Fuel Supply System for Liquified Petroleum Gas Injection (LPI) Engine
JP2007064201A (en) * 2005-08-30 2007-03-15 Hyundai Motor Co Ltd Lpi engine system

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