JP2007107442A - Gas fuel supply device - Google Patents

Gas fuel supply device Download PDF

Info

Publication number
JP2007107442A
JP2007107442A JP2005298423A JP2005298423A JP2007107442A JP 2007107442 A JP2007107442 A JP 2007107442A JP 2005298423 A JP2005298423 A JP 2005298423A JP 2005298423 A JP2005298423 A JP 2005298423A JP 2007107442 A JP2007107442 A JP 2007107442A
Authority
JP
Japan
Prior art keywords
pressure
fuel
fuel injection
injection pressure
gas
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.)
Pending
Application number
JP2005298423A
Other languages
Japanese (ja)
Inventor
Hiromasa Ono
博正 大野
Tomoaki Fukuoka
智昭 福岡
Masahiro Mizoguchi
昌広 溝口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikki Co Ltd
Original Assignee
Nikki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nikki Co Ltd filed Critical Nikki Co Ltd
Priority to JP2005298423A priority Critical patent/JP2007107442A/en
Priority to KR1020060004849A priority patent/KR20070041286A/en
Publication of JP2007107442A publication Critical patent/JP2007107442A/en
Pending legal-status Critical Current

Links

Images

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
    • F02D19/021—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
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0602—Fuel pressure
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a good air-fuel ratio, even in a condition where atmospheric pressure is changed and fuel injection pressure is fluctuated, in a device supplying vaporized gas fuel to an engine. <P>SOLUTION: In a gas fuel supply device 1A, liquified gas fuel stored in a fuel tank 10 is fed to a vaporizer 6 to vaporize the fuel therein, the fuel is adjusted to be vaporized gas of predetermined positive pressure and is fed to an injector 8 disposed to an intake conduit 52 of the engine 2 to supply the gas fuel to the engine, and an electronic control unit 11A performs a valve open control of the injector 8. A pressure sensor 15 as a fuel injection pressure detection means is disposed between a vaporizer 6 and the injector 8, and a valve open time of the injector 8 is corrected depending on difference between the detected fuel injection pressure and prestored standard fuel injection pressure, so as to control to eliminate deviation in air-fuel ratio along with change in fuel injection pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はＬＰＧ（液化石油ガス）やＬＮＧ（液化天然ガス）などの液化ガス燃料を減圧気化させて得た気体燃料をエンジンに供給する装置に関し、殊に、大気圧の変化により燃料噴射圧が変動するような状況であっても、良好な空燃比を得ることのできるガス燃料供給装置に関する。   The present invention relates to an apparatus for supplying a gaseous fuel obtained by vaporizing a liquefied gas fuel such as LPG (liquefied petroleum gas) or LNG (liquefied natural gas) under reduced pressure to the engine. The present invention relates to a gas fuel supply apparatus that can obtain a good air-fuel ratio even in a fluctuating situation.

ＬＰＧやＬＮＧなどの液化ガス燃料は、従前より火花点火エンジンの燃料に用いられており、レギュレータ（ベーパライザ）とミキサとを使用して大気圧程度に減圧させた気化ガスとして吸気管路に吸引させてエンジンに供給する方式が広く採用されているが、例えば特開平６−１７７０９号公報に記載されているように所定正圧の気化ガスに調整してエンジンの吸気管路に噴射させる方式が広く用いられている。   Liquefied gas fuels such as LPG and LNG have been used for spark ignition engines, and have been sucked into the intake pipe as vaporized gas that has been reduced to atmospheric pressure using a regulator (vaporizer) and mixer. However, for example, as described in Japanese Patent Laid-Open No. 6-17709, a method of adjusting to a predetermined positive pressure of vaporized gas and injecting it into the intake pipe of the engine is widely used. It is used.

この所定正圧の気化ガスに調整する方式においては、液化ガス燃料を加熱気化させる手段としてエンジン冷却水の熱を利用することが慣用されている。即ち、ガス燃料供給装置１Ｄが配設された図４のエンジンの燃料供給システムの配置図に示すように、燃料タンク１０から液体の状態で取り出されたガス燃料は、燃料タンク１０近傍およびエンジンルーム内に配置された遮断弁５ａ，５ｂを通過し、ベーパライザ６へと導かれる。ベーパライザ６はエンジン冷却水を循環させることで導入し液化ガス燃料との間で熱交換を行い、これを蒸発・気化させるようになっている。   In the method of adjusting the vaporized gas to a predetermined positive pressure, it is customary to use the heat of engine cooling water as means for heating and vaporizing the liquefied gas fuel. That is, as shown in the layout diagram of the engine fuel supply system of FIG. 4 in which the gas fuel supply device 1D is disposed, the gas fuel taken out in the liquid state from the fuel tank 10 is in the vicinity of the fuel tank 10 and the engine room. It passes through the shut-off valves 5 a and 5 b disposed inside and is guided to the vaporizer 6. The vaporizer 6 is introduced by circulating engine cooling water, exchanges heat with the liquefied gas fuel, and evaporates and vaporizes it.

また、ベーパライザ６は調圧機能を有しており、インジェクタ８に気化ガスを送出する吐出圧力は大気圧との圧力差をほぼ一定に調整されている。そして、インジェクタ８はエンジン点火系や噴射系の制御を行う電子制御ユニット１１Ｄ（ＥＣＵ）から出力される開弁信号により所定時間開弁してエンジン２に気体の状態としたガス燃料を噴射供給する。   Further, the vaporizer 6 has a pressure adjusting function, and the discharge pressure for sending the vaporized gas to the injector 8 is adjusted so that the pressure difference from the atmospheric pressure is substantially constant. The injector 8 injects and supplies gas fuel in a gaseous state to the engine 2 by opening it for a predetermined time by a valve opening signal output from an electronic control unit 11D (ECU) that controls the engine ignition system and injection system. .

しかし、このような従来のガス燃料供給装置１Ｄにおいて、ベーパライザ６内で調圧される噴射圧はダイヤフラム背圧側を大気圧としていることから、大気圧との差圧としてのゲージ圧は一定であるものの、標高の変動などによる大気圧の上下によりその絶対圧が変動してしまう、という現象が起きやすい。   However, in such a conventional gas fuel supply apparatus 1D, since the injection pressure regulated in the vaporizer 6 is the atmospheric pressure on the diaphragm back pressure side, the gauge pressure as the differential pressure from the atmospheric pressure is constant. However, there is a tendency that the absolute pressure fluctuates due to the rise and fall of atmospheric pressure due to changes in altitude.

即ち、一般的にインジェクタ８から噴射される気体燃料の流量は、圧縮性流体として以下に示す数式１で表されるが、この式から噴射圧（絶対圧）が変化すると密度も変化するため、開口面積が同じでも流量が変化することになる。これを実際のエンジン２に搭載した場合を考えてみると、車両が高地に行って気圧が低下することで燃料噴射圧が低下するため、インジェクタ８の駆動パルス幅が同じでも燃料流量が低下することになる。   That is, generally, the flow rate of the gaseous fuel injected from the injector 8 is expressed by the following mathematical formula 1 as a compressible fluid. From this formula, when the injection pressure (absolute pressure) changes, the density also changes. Even if the opening area is the same, the flow rate changes. Considering the case where this is mounted on the actual engine 2, the fuel injection pressure is reduced because the vehicle goes to a high altitude and the atmospheric pressure decreases, so the fuel flow rate decreases even if the drive pulse width of the injector 8 is the same. It will be.

Figure 2007107442
Figure 2007107442

一方、吸入空気量はエアフローメータ１２で質量流量として計測されるので、電子制御ユニット１１Ｄからインジェクタ８に出力される開弁時間の信号は平地の場合と変わらない。従って、噴射圧（絶対圧）の低下により流量が低下する分だけ空燃比にズレが生じて高地では空燃比がリーンになってしまう、という問題が発生する。
特開平６−１７７０９号公報 On the other hand, since the intake air amount is measured as a mass flow rate by the air flow meter 12, the valve opening time signal output from the electronic control unit 11D to the injector 8 is the same as in the case of flat ground. Therefore, there arises a problem that the air-fuel ratio is shifted by the amount that the flow rate is reduced due to a decrease in the injection pressure (absolute pressure), and the air-fuel ratio becomes lean at high altitude.
JP-A-6-17709

本発明は、上記のような問題点を解決しようとするものであり、液化ガス燃料を減圧気化させて得た気体燃料をエンジンに供給する装置について、高度変化などにより大気圧が変化して燃料噴射圧が変動する状況であっても、良好な空燃比が得られるようにすることを課題とする。   The present invention is intended to solve the above-described problems. An apparatus for supplying gaseous fuel obtained by vaporizing liquefied gas fuel under reduced pressure to an engine changes its atmospheric pressure due to altitude change or the like. An object is to obtain a good air-fuel ratio even when the injection pressure varies.

そこで、本発明は、燃料タンクに貯留した液化ガス燃料をベーパライザに送り該ベーパライザ内部の気化室で気化させるとともに大気圧を背圧としたダイヤフラムで区画された調圧室で所定正圧の気化ガスに調整してエンジンの吸気管路に送るとともに所定の検出手段で検出したデータを基に電子制御ユニットにより前記吸気管路に配置したインジェクタの開弁制御を実行して前記エンジンにガス燃料を供給するガス燃料供給装置において、前記検出手段としてベーパライザと前記インジェクタとの間の燃料供給管路に気化したガス燃料の圧力を検出する燃料噴射圧検出手段が配設され、前記燃料噴射圧検出装置により検出した燃料噴射圧と予め記憶した規準燃料噴射圧との差に応じて前記電子制御ユニットがインジェクタの開弁時間を補正することにより、燃料噴射圧の変化に伴う空燃比のズレを解消する方向に制御するものとした。   Accordingly, the present invention provides a vaporization gas having a predetermined positive pressure in a pressure-regulating chamber partitioned by a diaphragm that sends liquefied gas fuel stored in a fuel tank to a vaporizer and vaporizes it in a vaporization chamber inside the vaporizer and uses atmospheric pressure as a back pressure. To the engine intake pipe, and based on the data detected by the predetermined detection means, the electronic control unit executes the valve opening control of the injector arranged in the intake pipe to supply gas fuel to the engine. In the gas fuel supply apparatus to be supplied, a fuel injection pressure detecting means for detecting the pressure of vaporized gas fuel is disposed in the fuel supply pipe line between the vaporizer and the injector as the detecting means, and the fuel injection pressure detecting apparatus The electronic control unit corrects the valve opening time of the injector according to the difference between the fuel injection pressure detected by the above and the pre-stored reference fuel injection pressure The Rukoto was assumed that control in a direction to eliminate the deviation of the air-fuel ratio accompanying the change in fuel injection pressure.

このような構成とすることで、ベーパライザに内装したダイヤフラム背圧側の大気圧が変化する等して燃料噴射圧が変動する場合であっても、この変動量に対応してインジェクタの開弁時間を補正して空燃比のズレを最小限とすることができ、空燃比を良好に維持しやすい燃料噴射制御とすることができる。   By adopting such a configuration, even when the fuel injection pressure fluctuates due to a change in the atmospheric pressure on the diaphragm back pressure side built in the vaporizer, the valve opening time of the injector is reduced in accordance with the fluctuation amount. Correction can minimize the deviation of the air-fuel ratio, and the fuel injection control can easily maintain the air-fuel ratio satisfactorily.

また、このガス燃料供給装置において、大気圧検出手段が併設され、検出した大気圧データおよび燃料噴射圧データの両方を用いて、電子制御ユニットがインジェクタの開弁時間を補正するものとすれば、実際の大気圧変動に応じて補正量に調整を加えることにより一層適切な燃料噴射制御を実現しやすいものとなる。   Further, in this gas fuel supply device, if an atmospheric pressure detection means is provided, and the electronic control unit corrects the valve opening time of the injector using both the detected atmospheric pressure data and fuel injection pressure data, By adjusting the correction amount in accordance with the actual atmospheric pressure fluctuation, it becomes easier to realize more appropriate fuel injection control.

さらに、この大気圧検出手段を備えたガス燃料供給装置において、燃料噴射圧検出手段が燃料噴射圧を大気圧との差圧としてのゲージ圧で検出するものとし、電子制御ユニットが絶対圧で検出した大気圧データを用いて、検出した燃料噴射圧をゲージ圧から絶対圧に換算するものとすれば、燃料噴射圧を直接絶対圧で検出する場合と比べ、低コストで良好な空燃比を維持しやすいものとなる。   Further, in the gas fuel supply apparatus equipped with the atmospheric pressure detecting means, the fuel injection pressure detecting means detects the fuel injection pressure with a gauge pressure as a differential pressure from the atmospheric pressure, and the electronic control unit detects with the absolute pressure. If the detected fuel injection pressure is converted from gauge pressure to absolute pressure using the measured atmospheric pressure data, a good air-fuel ratio is maintained at a lower cost than when the fuel injection pressure is directly detected as absolute pressure. It will be easy to do.

さらにまた、上述したガス燃料供給装置において、燃料噴射圧検出手段は燃料噴射圧を絶対圧で検出するものとすれば、大気圧との差圧としてのゲージ圧で検出するものと異なり、車両の運転状況に標高の変化を伴う場合であっても燃料噴射圧を正確に検出しやすいものとなる。   Furthermore, in the gas fuel supply apparatus described above, if the fuel injection pressure detecting means detects the fuel injection pressure as an absolute pressure, it differs from that detected by a gauge pressure as a differential pressure from the atmospheric pressure. Even when the operating situation is accompanied by a change in altitude, the fuel injection pressure can be easily detected accurately.

一方、上述したガス燃料供給装置とは異なり、燃料タンクに貯留した液化ガス燃料をベーパライザに送りその内部の気化室で気化させるとともに大気圧を背圧としたダイヤフラムで区画された調圧室で所定正圧の気化ガスに調整してエンジンの吸気管路に配置したインジェクタに送りエンジンにガス燃料を供給するものであって、所定の検出手段で検知したデータを基に電子制御ユニットがインジェクタの開弁制御を実行するガス燃料供給装置において、大気圧検出手段が配設され、電子制御ユニットが、検出した大気圧データを基に燃料噴射圧を予測し、予測した燃料噴射圧と予め記憶した規準燃料噴射圧との差に応じて、インジェクタの開弁時間を補正して燃料噴射圧の変化に伴う空燃比のズレを解消する方向に制御するものとすれば、空気量補正のために予め大気圧検出手段を備えている場合等において、燃料噴射圧検出手段を不要として一層低コストで良好な空燃比を得ることができる。   On the other hand, unlike the gas fuel supply device described above, the liquefied gas fuel stored in the fuel tank is sent to the vaporizer and vaporized in the vaporizer chamber, and the pressure is regulated in a pressure regulating chamber partitioned by a diaphragm whose back pressure is atmospheric pressure. The fuel gas is fed to an injector arranged in the intake pipe of the engine after being adjusted to a positive pressure vaporized gas, and gas fuel is supplied to the engine. The electronic control unit opens the injector based on data detected by a predetermined detection means. In a gas fuel supply apparatus that executes valve control, an atmospheric pressure detection means is provided, and an electronic control unit predicts a fuel injection pressure based on the detected atmospheric pressure data, and stores the predicted fuel injection pressure and a pre-stored standard. According to the difference with the fuel injection pressure, if the valve opening time of the injector is corrected and controlled in a direction to eliminate the deviation of the air-fuel ratio accompanying the change in the fuel injection pressure, When such is provided with a pre-atmospheric pressure detecting means for gas amount correction, it is possible to obtain a good air-fuel ratio at a much lower cost of the fuel injection pressure detecting means as needed.

そして、このガス燃料供給装置において、大気圧検出手段は大気圧を絶対圧で検出するとともに電子制御ユニットが予測する燃料噴射圧力も絶対圧とすれば、相対圧としてのゲージ圧によるものと比べて、大気圧の変化による影響を最小限として精度の高い燃料噴射制御を実現しやすいものとなる。   In this gas fuel supply apparatus, if the atmospheric pressure detecting means detects the atmospheric pressure with an absolute pressure and the fuel injection pressure predicted by the electronic control unit is also an absolute pressure, it is compared with a gauge pressure as a relative pressure. Therefore, it becomes easy to realize highly accurate fuel injection control while minimizing the influence of changes in atmospheric pressure.

本発明により、気圧の変化等による燃料噴射圧の変動に的確に対応して、良好な空燃比を得る燃料噴射制御を実現できるものである。   According to the present invention, it is possible to realize fuel injection control that obtains a good air-fuel ratio in an appropriate manner in response to fluctuations in fuel injection pressure due to changes in atmospheric pressure or the like.

図面を参照して本発明の実施の形態を説明すると、本実施の形態のガス燃料供給装置１Ａを配設したエンジンの燃料供給システムの配置図を示す図１を参照して、燃料タンク１０にはＬＰＧなどのガス燃料が液体の状態で貯留されており、燃料タンク１０から延びた燃料供給管路９Ａがベーパライザ６に接続している。また、燃料供給管路９Ａには燃料タンク１０出口寄りに第一遮断弁５ａが配設され、ベーパライザ６入口寄りに第二遮断弁５ｂが配設されている。   An embodiment of the present invention will be described with reference to the drawings. Referring to FIG. 1 showing a layout diagram of an engine fuel supply system in which a gas fuel supply device 1A of the present embodiment is provided, a fuel tank 10 is provided. Gas fuel such as LPG is stored in a liquid state, and a fuel supply line 9 </ b> A extending from the fuel tank 10 is connected to the vaporizer 6. Further, in the fuel supply line 9A, a first shut-off valve 5a is disposed near the fuel tank 10 outlet, and a second shut-off valve 5b is disposed near the vaporizer 6 inlet.

ベーパライザ６は、ガス燃料を液体の状態から減圧・気化して所定正圧の気化ガスに調整して送出するものであり、内部上流側にエンジン冷却水を熱源に用いた加熱室を備え、その下流側には大気圧を背圧とするとともに調圧バネを有するダイヤフラムで区画された調圧室を備えている。また、ベーパライザ６から延びる燃料供給管路９Ｂは、エンジン２の吸気管路５２に開口する複数のインジェクタ８に燃料レール７を介して接続されている。   The vaporizer 6 depressurizes and vaporizes the gas fuel from a liquid state and adjusts and sends it to a predetermined positive pressure vaporized gas. The vaporizer 6 includes a heating chamber using engine cooling water as a heat source on the upstream side thereof. On the downstream side, a pressure regulating chamber is provided which is divided by a diaphragm having a pressure regulating spring while using atmospheric pressure as a back pressure. The fuel supply line 9 </ b> B extending from the vaporizer 6 is connected to a plurality of injectors 8 that open to the intake pipe 52 of the engine 2 via the fuel rail 7.

本実施の形態において、ベーパライザ６からインジェクタ８に接続する燃料供給管路９Ｂに、気化の状態となったガス燃料の噴射圧力を検出する燃料噴射圧検出手段として圧力センサ１５が配設されている点を特徴としている。また、インジェクタ８は電子制御ユニット１１Ａに接続されており、吸気管路５２にはエアフローメータ１２が配置されエンジン２の吸入空気量を検出して電子制御ユニット１１Ａに入力する点は従来のものと同様である。尚、圧力センサ１５で検出する燃料噴射圧は絶対圧となっており、大気圧の変動により影響を受けにくいようになっている。   In the present embodiment, a pressure sensor 15 is disposed in the fuel supply line 9B connected from the vaporizer 6 to the injector 8 as fuel injection pressure detecting means for detecting the injection pressure of the vaporized gas fuel. Characterized by dots. The injector 8 is connected to the electronic control unit 11A, and the air flow meter 12 is arranged in the intake pipe 52 so that the intake air amount of the engine 2 is detected and inputted to the electronic control unit 11A. It is the same. The fuel injection pressure detected by the pressure sensor 15 is an absolute pressure and is not easily affected by fluctuations in atmospheric pressure.

一方、電子制御ユニット１１Ａは、内装した記憶手段に所定のエンジン制御プログラムがインストールされ、エアフローメータ１２等によるエンジンの状態を示す種々の検出データを基にインジェクタ８の開弁時間を算出して、良好な空燃比を得るために燃料噴射制御を実行する制御装置である点も従来のものと同様である。そして、本発明においては通常の燃料噴射制御機能に加え、圧力センサ１５を用いて検知した燃料噴射圧を基にインジェクタ８の開弁時間を補正する機能を有している点に特徴がある。   On the other hand, the electronic control unit 11A calculates a valve opening time of the injector 8 based on various detection data indicating the state of the engine by the air flow meter 12 or the like, in which a predetermined engine control program is installed in the internal storage means. It is the same as the conventional one in that it is a control device that executes fuel injection control to obtain a good air-fuel ratio. In addition to the normal fuel injection control function, the present invention is characterized in that it has a function of correcting the valve opening time of the injector 8 based on the fuel injection pressure detected using the pressure sensor 15.

即ち、前述したように、ガス燃料供給装置には通常ベーパライザ内に大気圧を背圧とするダイヤフラムで区画された調圧室を備えており、標高が大きく変化するような車両の運転状態においては、大気圧の変化に伴い燃料噴射の絶対圧が変動することで燃料噴射量も変動するため、空燃比を適切にコントロールすることが困難であった。そのため、本発明において圧力センサ１５で燃料噴射圧を常にモニタし、検知した燃料噴射圧に応じてインジェクタ８の開弁時間を補正するようにして、大気圧の変化で生じる空燃比の誤差をなくす方向に制御を行うようにしたものである。   That is, as described above, the gas fuel supply apparatus is usually provided with a pressure regulating chamber partitioned by a diaphragm whose back pressure is atmospheric pressure in the vaporizer, and in a vehicle operating state in which the altitude changes greatly. Since the fuel injection amount also fluctuates because the absolute pressure of fuel injection fluctuates with changes in atmospheric pressure, it is difficult to control the air-fuel ratio appropriately. Therefore, in the present invention, the fuel injection pressure is constantly monitored by the pressure sensor 15 and the valve opening time of the injector 8 is corrected according to the detected fuel injection pressure, thereby eliminating the air-fuel ratio error caused by the change in atmospheric pressure. Control is performed in the direction.

この制御についてさらに詳細に説明すると、電子制御ユニット１１Ａには規準値となる燃料噴射圧（絶対圧）が記憶されており、この値と検知した燃料噴射圧の値とを比較し、インジェクタ８に出力する開弁信号の補正量を計算するようになっている。例えば、背圧としての大気圧が低下することにより燃料噴射圧が規準値よりも低くなる場合は燃料噴射量を増量するように補正し、逆に規準値よりも高くなる場合には燃料噴射量を減量するように補正して、的確な空燃比が得られる燃料噴射時間となるように制御するものである。   This control will be described in more detail. The fuel injection pressure (absolute pressure) serving as a reference value is stored in the electronic control unit 11A, and this value is compared with the detected fuel injection pressure value. The correction amount of the valve opening signal to be output is calculated. For example, if the fuel injection pressure becomes lower than the reference value due to a decrease in the atmospheric pressure as the back pressure, the fuel injection amount is corrected to be increased. Conversely, if the fuel injection pressure becomes higher than the reference value, the fuel injection amount The fuel injection time is corrected so as to decrease, and control is performed so that the fuel injection time is obtained so that an accurate air-fuel ratio can be obtained.

このことにより、エンジンを搭載した車両の走行に伴い標高が変化する場合、例えば高地に行って大気圧が低下し燃料噴射圧（絶対圧）が低下するような状況であっても、安定的に良好な空燃比を維持できるようになる。尚、本実施の形態において、圧力センサ１５は燃料噴射圧を絶対圧で検出するようになっており、検出値が大気圧の変動に影響されないことからより的確な燃料噴射制御を実行しやすいものとなっている。   As a result, when the altitude changes as the vehicle equipped with the engine travels, even if the altitude is lowered and the fuel injection pressure (absolute pressure) is lowered, for example, when the altitude is lowered, the fuel injection pressure (absolute pressure) is reduced stably. A good air-fuel ratio can be maintained. In the present embodiment, the pressure sensor 15 detects the fuel injection pressure as an absolute pressure, and since the detected value is not affected by fluctuations in atmospheric pressure, more accurate fuel injection control can be easily performed. It has become.

図２は、本発明における第二の実施の形態であるガス燃料供給装置１Ｂを備えたエンジンの燃料供給システムの配置図である。本実施の形態も基本的構成は前述のガス燃料供給装置１Ａとほぼ同様であるが、燃料噴射圧を絶対圧で検出する圧力センサ１５の代わりに、燃料噴射圧をゲージ圧で検出する圧力センサ１６が配設されているとともに、吸気管路５２に大気圧（絶対圧）を測定する圧力センサ１４を追加して配設した点が異なる。   FIG. 2 is a layout diagram of an engine fuel supply system including a gas fuel supply apparatus 1B according to a second embodiment of the present invention. The basic configuration of the present embodiment is almost the same as that of the gas fuel supply apparatus 1A described above, but a pressure sensor that detects the fuel injection pressure with a gauge pressure instead of the pressure sensor 15 that detects the fuel injection pressure with an absolute pressure. 16 is different from the intake pipe 52 in that a pressure sensor 14 for measuring atmospheric pressure (absolute pressure) is additionally provided.

そして、電子制御ユニット１１Ｂは、ゲージ圧で検出した燃料噴射圧と圧力センサ１４で検出した大気圧との関係から所定の計算方法を用いて絶対圧の燃料噴射圧に換算するようになっている。例えば、ゲージ圧の燃料噴射圧にそのときの大気圧に応じて予め設定された所定の係数を掛ける等して、上述のガス燃料供給装置１Ａと同様に燃料噴射時間を補正するものとして、的確な燃料噴射制御を実行できるようになっている。尚、本実施の形態は、エンジンの燃料供給システムに当初から大気圧検出手段が配設されている場合において比較的低コストで上述の効果を得られる点で有利なものとなる。   The electronic control unit 11B converts the fuel injection pressure detected by the gauge pressure and the atmospheric pressure detected by the pressure sensor 14 into an absolute fuel injection pressure using a predetermined calculation method. . For example, the fuel injection time is corrected by correcting the fuel injection time in the same manner as the gas fuel supply apparatus 1A by multiplying the fuel injection pressure of the gauge pressure by a predetermined coefficient set in advance according to the atmospheric pressure at that time. Fuel injection control can be executed. This embodiment is advantageous in that the above-described effects can be obtained at a relatively low cost when the atmospheric pressure detecting means is provided in the fuel supply system of the engine from the beginning.

図３は、発明における第三の実施の形態であるガス燃料供給装置１Ｃを備えたエンジンの燃料供給システムの配置図を示している。本実施の形態は、図２のガス燃料供給装置１Ｂにおける圧力センサ１６を取り外したものであり、圧力センサ１４で検出した大気圧（絶対圧）から所定の導出方法によりベーパライザで気化された燃料の噴射圧を絶対圧で求めて予測するようになっている。そして、上述の二つの実施の形態と同様、電子制御ユニット１１Ｃがインジェクタ８の開弁時間を補正する制御を実行するものである。   FIG. 3 shows a layout of an engine fuel supply system including a gas fuel supply device 1C according to the third embodiment of the invention. In this embodiment, the pressure sensor 16 in the gas fuel supply apparatus 1B of FIG. 2 is removed, and the fuel vaporized by the vaporizer by the predetermined derivation method from the atmospheric pressure (absolute pressure) detected by the pressure sensor 14 is used. The injection pressure is obtained by an absolute pressure and predicted. Then, as in the above-described two embodiments, the electronic control unit 11C executes control for correcting the valve opening time of the injector 8.

本実施の形態おいては、ベーパライザ６の吐出圧（燃料噴射圧）が殆ど変動しない場合や、大気圧の変動に応じたベーパライザ６の吐出圧特性を電子制御ユニット１１Ｃが記憶している場合に適用する意義が大きいものである。例えば、電子制御ユニット１１Ｃの記憶手段に、大気圧（絶対圧）の値とそのときの燃料噴射圧（絶対圧）の値を実験等で連続的に求めた数値を吐出圧特性としてグラフ化または関数化したものを記憶させておき、これを用いて電子制御ユニット１１Ｃが検知した大気圧（絶対圧）から絶対圧の燃料噴射圧を算出することができる。   In the present embodiment, when the discharge pressure (fuel injection pressure) of the vaporizer 6 hardly fluctuates, or when the electronic control unit 11C stores the discharge pressure characteristics of the vaporizer 6 according to the fluctuation of the atmospheric pressure. The significance of application is great. For example, in the storage means of the electronic control unit 11C, a numerical value obtained by continuously obtaining the value of the atmospheric pressure (absolute pressure) and the value of the fuel injection pressure (absolute pressure) at that time by an experiment or the like is graphed as a discharge pressure characteristic By storing the function, it is possible to calculate the absolute fuel injection pressure from the atmospheric pressure (absolute pressure) detected by the electronic control unit 11C.

これにより、大気圧から燃料噴射圧を絶対圧で予測することができ、燃料噴射圧検出手段を不要として構成が簡易化され、気圧が変化し燃料噴射圧が変動するような車両の運転状況であっても、一層低コストで良好な空燃比が得られる燃料噴射制御を実行できるものである。   As a result, the fuel injection pressure can be predicted from the atmospheric pressure as an absolute pressure, the fuel injection pressure detecting means is not required, the configuration is simplified, and the vehicle operating conditions in which the air pressure changes and the fuel injection pressure fluctuates. Even in this case, it is possible to execute the fuel injection control that can obtain a good air-fuel ratio at a lower cost.

本発明の第一の実施の形態を示す配置図。The layout which shows 1st embodiment of this invention. 本発明の第二の実施の形態を示す配置図。The layout which shows 2nd embodiment of this invention. 本発明の第三の実施の形態を示す配置図。The layout which shows 3rd embodiment of this invention. 従来例を示す配置図。The layout which shows a prior art example.

符号の説明Explanation of symbols

１Ａ，１Ｂ，１Ｃ ガス燃料供給装置、 ２ エンジン、 ６ ベーパライザ、 ８ インジェクタ、 ９Ａ，９Ｂ 燃料供給管路、 １０ 燃料タンク、 １１Ａ，１１Ｂ，１１Ｃ 電子制御ユニット、 １２ エアフローメータ、１４，１５，１６ 圧力センサ、 ５２ 吸気管路
1A, 1B, 1C Gas fuel supply device, 2 Engine, 6 Vaporizer, 8 Injector, 9A, 9B Fuel supply line, 10 Fuel tank, 11A, 11B, 11C Electronic control unit, 12 Air flow meter, 14, 15, 16 Pressure Sensor, 52 Intake pipe

Claims (6)

燃料タンクに貯留した液化ガス燃料をベーパライザに送り該ベーパライザ内部の気化室で気化させるとともに大気圧を背圧としたダイヤフラムで区画された調圧室で所定正圧の気化ガスに調整してエンジンの吸気管路に送るとともに所定の検出手段で検出したデータを基に電子制御ユニットにより前記吸気管路に配置したインジェクタの開弁制御を実行して前記エンジンにガス燃料を供給するガス燃料供給装置において、前記検出手段としてベーパライザと前記インジェクタとの間の燃料供給管路に気化したガス燃料の圧力を検出する燃料噴射圧検出手段が配設され、前記燃料噴射圧検出装置により検出した燃料噴射圧と予め記憶した規準燃料噴射圧との差に応じて前記電子制御ユニットがインジェクタの開弁時間を補正することにより、燃料噴射圧の変化に伴う空燃比のズレを解消する方向に制御することを特徴とするガス燃料供給装置。   The liquefied gas fuel stored in the fuel tank is sent to the vaporizer, vaporized in the vaporization chamber inside the vaporizer, and adjusted to a predetermined positive pressure vaporized gas in the pressure regulating chamber partitioned by a diaphragm whose back pressure is atmospheric pressure. A gas fuel supply device for supplying gas fuel to the engine by performing valve opening control of an injector disposed in the intake pipe by an electronic control unit based on data sent to the intake pipe and detected by predetermined detection means A fuel injection pressure detecting means for detecting the pressure of vaporized gas fuel in a fuel supply line between the vaporizer and the injector as the detecting means, and the fuel injection pressure detected by the fuel injection pressure detecting device The electronic control unit corrects the valve opening time of the injector according to the difference between the reference fuel injection pressure stored in advance and the reference fuel injection pressure. Gas fuel supply system and controls the direction to eliminate the deviation of the air-fuel ratio accompanying the change of the injection pressure. 前記検出手段として大気圧検出手段が併用され、検出した大気圧データおよび燃料噴射圧データの両方を用いて前記電子制御ユニットが前記インジェクタの開弁時間を補正する請求項１記載のガス燃料供給装置。   The gas fuel supply apparatus according to claim 1, wherein atmospheric pressure detection means is used in combination as the detection means, and the electronic control unit corrects the valve opening time of the injector using both detected atmospheric pressure data and fuel injection pressure data. . 前記燃料噴射圧検出手段が燃料噴射圧を大気圧との差圧としてのゲージ圧で検出するものであり、前記電子制御ユニットが絶対圧で検出した大気圧データを用いて、検出した燃料噴射圧をゲージ圧から絶対圧に換算する請求項２記載のガス燃料供給装置。   The fuel injection pressure detecting means detects the fuel injection pressure with a gauge pressure as a differential pressure from the atmospheric pressure, and the detected fuel injection pressure using the atmospheric pressure data detected by the electronic control unit as an absolute pressure. The gas fuel supply device according to claim 2, wherein the pressure is converted from a gauge pressure to an absolute pressure. 前記燃料噴射圧検出手段が、燃料噴射圧を絶対圧で検出するものである請求項１または２に記載のガス燃料供給装置。   The gas fuel supply device according to claim 1 or 2, wherein the fuel injection pressure detecting means detects the fuel injection pressure with an absolute pressure. 燃料タンクに貯留した液化ガス燃料をベーパライザに送り該ベーパライザ内部の気化室で気化させるとともに大気圧を背圧としたダイヤフラムで区画された調圧室で所定正圧の気化ガスに調整してエンジンの吸気管路に送るとともに所定の検出手段で検出したデータを基に電子制御ユニットにより前記吸気管路に配置したインジェクタの開弁制御を実行して前記エンジンにガス燃料を供給するガス燃料供給装置において、前記検出手段として大気圧検出手段が配置され、検出した大気圧データを基に電子制御ユニットが燃料噴射圧を予測し、予測した燃料噴射圧と予め記憶した規準燃料噴射圧との差に応じて、前記インジェクタの開弁時間を補正して燃料噴射圧の変化に伴う空燃比のズレを解消する方向に制御することを特徴とするガス燃料供給装置。   The liquefied gas fuel stored in the fuel tank is sent to the vaporizer, vaporized in the vaporization chamber inside the vaporizer, and adjusted to a predetermined positive pressure vaporized gas in the pressure regulating chamber partitioned by a diaphragm whose back pressure is atmospheric pressure. A gas fuel supply device for supplying gas fuel to the engine by performing valve opening control of an injector disposed in the intake pipe by an electronic control unit based on data sent to the intake pipe and detected by predetermined detection means The atmospheric pressure detection means is disposed as the detection means, and the electronic control unit predicts the fuel injection pressure based on the detected atmospheric pressure data, and the difference between the predicted fuel injection pressure and the previously stored reference fuel injection pressure is calculated. Accordingly, the gas fuel is controlled by correcting the valve opening time of the injector so as to eliminate the deviation of the air-fuel ratio associated with the change in the fuel injection pressure. Charging device. 前記大気圧検出手段が大気圧を絶対圧で検出するとともに前記電子制御ユニットが予測する燃料噴射圧力も絶対圧である請求項５記載のガス燃料供給装置。
6. The gas fuel supply apparatus according to claim 5, wherein the atmospheric pressure detecting means detects the atmospheric pressure with an absolute pressure, and the fuel injection pressure predicted by the electronic control unit is also an absolute pressure.
JP2005298423A 2005-10-13 2005-10-13 Gas fuel supply device Pending JP2007107442A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2005298423A JP2007107442A (en) 2005-10-13 2005-10-13 Gas fuel supply device
KR1020060004849A KR20070041286A (en) 2005-10-13 2006-01-17 Apparatus for supplying gas fuel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005298423A JP2007107442A (en) 2005-10-13 2005-10-13 Gas fuel supply device

Publications (1)

Publication Number Publication Date
JP2007107442A true JP2007107442A (en) 2007-04-26

Family

ID=38033498

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005298423A Pending JP2007107442A (en) 2005-10-13 2005-10-13 Gas fuel supply device

Country Status (2)

Country Link
JP (1) JP2007107442A (en)
KR (1) KR20070041286A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009097364A (en) * 2007-10-15 2009-05-07 Nikki Co Ltd Fuel supply method for gas engine and gasoline alternative gas fuel injection control device
JP2009180132A (en) * 2008-01-30 2009-08-13 Toyota Motor Corp Heat recovery and utilization system for internal combustion engine
US8967121B2 (en) 2010-06-17 2015-03-03 Toyota Jidosha Kabushiki Kaisha Internal combustion engine control apparatus and control method for internal combustion engine control apparatus
CN108571393A (en) * 2017-03-08 2018-09-25 福特环球技术公司 The method and system of port fuel injection
CN113124315A (en) * 2021-04-30 2021-07-16 常州易控汽车电子股份有限公司 LNG pressure boost control system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07189811A (en) * 1993-12-28 1995-07-28 Honda Motor Co Ltd Controlling method for fuel injection quantity in gas fuel engine
JPH1162678A (en) * 1997-08-22 1999-03-05 Honda Motor Co Ltd Failure detection device for fuel pressure sensor
JP2000087771A (en) * 1998-09-09 2000-03-28 Toyota Motor Corp Supply fuel control unit of gas fuel internal combustion engine
JP2001193571A (en) * 2000-01-12 2001-07-17 Hitachi Ltd Diagnostic device for gaseous fuel engine
JP2002089373A (en) * 2000-09-19 2002-03-27 Nikki Co Ltd Liquefied gas supplying method for engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07189811A (en) * 1993-12-28 1995-07-28 Honda Motor Co Ltd Controlling method for fuel injection quantity in gas fuel engine
JPH1162678A (en) * 1997-08-22 1999-03-05 Honda Motor Co Ltd Failure detection device for fuel pressure sensor
JP2000087771A (en) * 1998-09-09 2000-03-28 Toyota Motor Corp Supply fuel control unit of gas fuel internal combustion engine
JP2001193571A (en) * 2000-01-12 2001-07-17 Hitachi Ltd Diagnostic device for gaseous fuel engine
JP2002089373A (en) * 2000-09-19 2002-03-27 Nikki Co Ltd Liquefied gas supplying method for engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009097364A (en) * 2007-10-15 2009-05-07 Nikki Co Ltd Fuel supply method for gas engine and gasoline alternative gas fuel injection control device
JP2009180132A (en) * 2008-01-30 2009-08-13 Toyota Motor Corp Heat recovery and utilization system for internal combustion engine
US8967121B2 (en) 2010-06-17 2015-03-03 Toyota Jidosha Kabushiki Kaisha Internal combustion engine control apparatus and control method for internal combustion engine control apparatus
CN108571393A (en) * 2017-03-08 2018-09-25 福特环球技术公司 The method and system of port fuel injection
CN108571393B (en) * 2017-03-08 2022-12-06 福特环球技术公司 Method and system for port fuel injection
CN113124315A (en) * 2021-04-30 2021-07-16 常州易控汽车电子股份有限公司 LNG pressure boost control system

Also Published As

Publication number Publication date
KR20070041286A (en) 2007-04-18

Similar Documents

Publication Publication Date Title
EP2837801B1 (en) Method and apparatus for controlling fuel pressure in a gaseous fuelled internal combustion engine
JP4695042B2 (en) Add-on gas fuel injection system
US8151740B2 (en) System and method for controlling the calorie content of a fuel
US9004050B2 (en) Gaseous fuel rail sensor diagnostics
JP2007107442A (en) Gas fuel supply device
JP2008215130A (en) Injector control device for gas engine
JP5890214B2 (en) Control system for internal combustion engine and inert gas concentration detection device for compressed natural gas
JP2010007595A (en) Fuel supply system for lpg engine
JP2006299838A (en) Fuel supply device for engine
KR100889692B1 (en) Apparatus for detecting level of fuel of car
JP2014106098A (en) Density measurement system for liquefied natural gas, facility for liquefied natural gas including the system and density measurement method for liquefied natural gas
JP4802881B2 (en) Fuel supply device for internal combustion engine
JP2007146806A (en) Fuel system for liquefied gas fuel engine
JP2009167923A (en) Method for supplying fuel to engine, and gasoline alternative liquified petroleum gas injection control device
JP4348686B2 (en) Engine fuel supply method and apparatus
JP5079744B2 (en) Fuel vapor pressure measurement system
EP2508741B1 (en) Method and device for the diagnosis of gaseous fluid leakages in a fuel feed circuit of an engine driven vehicle
CN105793546A (en) Fuel injection control device
KR100897095B1 (en) Method for detecting and preventing the fuel leakage in lpi system
JP2011153529A (en) Fuel supply device for engine
JP4459119B2 (en) Fuel supply system for gas engine
KR20100125909A (en) Apparatus and method for controlling fuel pump speed of lpi vehicle
JPH0192562A (en) Electric control fuel supply device for liquefied oil gas engine
KR101791756B1 (en) Fuel Supply System of Vehicle and Method of Driving Thereof
KR101396315B1 (en) Gas fuel supply system of the vehicle where the cylinder by supply amount of fuel deviation is minimized

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20081009

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100428

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100511

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20101012