JP4989281B2 - Gas engine fuel supply method and gasoline alternative gas fuel injection control device - Google Patents

Gas engine fuel supply method and gasoline alternative gas fuel injection control device Download PDF

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JP4989281B2
JP4989281B2 JP2007102719A JP2007102719A JP4989281B2 JP 4989281 B2 JP4989281 B2 JP 4989281B2 JP 2007102719 A JP2007102719 A JP 2007102719A JP 2007102719 A JP2007102719 A JP 2007102719A JP 4989281 B2 JP4989281 B2 JP 4989281B2
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gasoline
gas fuel
fuel injection
injection signal
gas
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JP2008261232A (en
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州俊 稲生
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Nikki Co Ltd
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Nikki Co Ltd
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    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
    • F02D19/061—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
    • 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
    • F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • 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)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Description

本発明は、既設のガソリン噴射システムをガス燃料を使用するガソリン代替ガス燃料噴射システムに改造した場合における、ガスエンジンの燃料供給方法及びガソリン代替ガス燃料噴射制御装置に関するものである。   The present invention relates to a fuel supply method for a gas engine and a gasoline alternative gas fuel injection control device when an existing gasoline injection system is modified to a gasoline alternative gas fuel injection system using gas fuel.

ＬＰＧ（液化石油ガス）やＣＮＧ（天然ガス）等のガス燃料はガソリンに比べて安価に入手できることや排気中の有害成分が少ないなどの利点があることは知られているが、ガソリンにより稼働する火花点火エンジンのようには普及していない。   Gas fuels such as LPG (liquefied petroleum gas) and CNG (natural gas) are known to have advantages such as being cheaper than gasoline and having less harmful components in the exhaust, but they operate on gasoline. Not as popular as a spark ignition engine.

そこで、ガソリンにより稼働する火花点火エンジンをガス燃料を用いて可働させることが行われており、例えば特開平６−１７７０９号公報などに記載されているようにＬＰＧやＣＮＧ（圧縮天然ガス）を気体の状態にして所定圧力に調整し吸気管路に噴射させてエンジンに供給する方式が広く普及している。   Therefore, a spark ignition engine operated by gasoline is operated using gas fuel. For example, as described in JP-A-6-17709, LPG or CNG (compressed natural gas) is used. A system in which a gas is adjusted to a predetermined pressure, injected into an intake pipe, and supplied to an engine is widely used.

そして、ガソリン噴射システムを搭載している既存のエンジンに、ガソリンとは特性の異なるガス燃料をインジェクタから吸気管路に噴射する噴射システムを搭載することにより既存のガソリン噴射システムをそのまま利用してガソリン代替ガス燃料噴射システムを構築するするには、例えば特開２００４―１０８１４８号公報に記載されているように、ガソリン噴射システムの電子制御装置におけるガソリン噴射量と同等の混合気を与える燃料噴射量を種々のデータを用いて所定の計算式で算出する、というきわめて簡単な機能をもたせたガソリン代替ガス燃料用の電子制御装置を増設し、且つ、燃料の種類ごとに噴射に適した弁口径・ダイナミックレンジをもつ電磁駆動式のインジェクタを使用することが知られている。   The existing engine equipped with a gasoline injection system is equipped with an injection system that injects gas fuel, which has different characteristics from gasoline, from the injector into the intake pipe. In order to construct an alternative gas fuel injection system, for example, as described in Japanese Patent Application Laid-Open No. 2004-108148, a fuel injection amount that gives an air-fuel mixture equivalent to a gasoline injection amount in an electronic control unit of a gasoline injection system is set. An electronic control unit for gasoline alternative gas fuel with a very simple function of calculating with a predetermined calculation formula using various data is added, and the valve diameter and dynamic suitable for injection for each fuel type It is known to use an electromagnetically driven injector with a range.

このような従来のガソリン代替ガス燃料噴射システムは、配置図である図１、及びこれに配設される制御装置の機能ブロック図である図２に示すように、エンジン１の運転状態を各種センサ５〜９で検出し、ガソリン噴射信号Ｉ１〜Ｉｎを出力する電子制御ユニット１０を有する既設のガソリン噴射制御装置と、ガソリン噴射信号をガス燃料用に補正適合してガス燃料噴射信号Ｏ１〜Ｏｎとしてエンジンの各気筒に設けたインジェクタ２へ出力する電子制御ユニット１１を有するガソリン代替ガス燃料噴射制御装置とを備えている。   As shown in FIG. 1 which is a layout diagram and FIG. 2 which is a functional block diagram of a control device disposed in such a conventional gasoline alternative gas fuel injection system, the operation state of the engine 1 is measured by various sensors. The existing gasoline injection control device having the electronic control unit 10 that detects the fuel injection signals I1 to In and outputs the gasoline injection signals I1 to In and the gas injection signals O1 to On by correcting the gasoline injection signals for gas fuel. And a gasoline alternative gas fuel injection control device having an electronic control unit 11 that outputs to an injector 2 provided in each cylinder of the engine.

前記電子制御ユニット１１には図５に示すように電子制御ユニット１０からのガソリン噴射信号Ｉｎが入力されており、その信号においてＯＦＦからＯＮに切り替わるガソリン噴射開始の波形を検知すると、所定のディレイ時間をカウントしてからガス燃料噴射信号ＯｎをＯＦＦからＯＮに切換え、ガソリン噴射時間および各種センサから入力されたエンジン運転状態に基いて計算されたガス燃料の噴射時間に基づいてインジェクタ２からガス燃料を噴射させる制御を実行するようになっている。   As shown in FIG. 5, the electronic control unit 11 receives a gasoline injection signal In from the electronic control unit 10, and when a gasoline injection start waveform switching from OFF to ON is detected in the signal, a predetermined delay time is detected. The gas fuel injection signal On is switched from OFF to ON, and the gas fuel is supplied from the injector 2 based on the gasoline injection time and the injection time of the gas fuel calculated based on the engine operating state input from various sensors. Control to inject is executed.

しかしながら、ガソリン噴射信号Ｉｎのオン時間が想定した範囲を超えた場合に、ガス燃料噴射信号Ｏｎのオン時間が異常に長時間化して、電磁駆動式のインジェクタ２におけるインジェクタ・コイルが過熱して溶損してしまうという問題がある。
特開平６−１７７０９号公報 特開２００４―１０８１４８号公報 However, when the on-time of the gasoline injection signal In exceeds the assumed range, the on-time of the gas fuel injection signal On becomes abnormally long, and the injector coil in the electromagnetically driven injector 2 is overheated and melted. There is a problem of losing.
JP-A-6-17709 JP 2004-108148 A

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、ガソリン噴射システムを利用したガソリン代替ガス燃料噴射システムについて、ガソリン代替ガス燃料噴射制御装置に入力されるガソリン噴射信号のオン時間が想定した時間を超えるような場合でも、インジェクタ・コイルが溶損することを防止でき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, and an on-time of a gasoline injection signal input to a gasoline alternative gas fuel injection control device in a gasoline alternative gas fuel injection system using a gasoline injection system. It is an object of the present invention to prevent the injector coil from being melted even when the estimated time exceeds the expected time.

前記課題を解決するためになされた本発明は、ガソリン噴射制御装置から出力されるガソリン噴射信号により制御されるエンジン既設のガソリン噴射システムに、前記ガソリン噴射制御装置における電子制御ユニットが出力するガソリン噴射信号を受信しガス燃料噴射信号を出力するガソリン代替ガス燃料噴射制御装置における電子制御ユニットと、これに接続された電磁駆動式でガス燃料用のインジェクタとを増設してなるガソリン代替ガス燃料噴射システムで実施されるガスエンジンの燃料供給方法において、前記ガソリン代替ガス燃料噴射制御装置における電子制御ユニットが前記ガス燃料噴射信号の連続したオン時間が所定の時間を超えないように所定のタイミングで自動的にオフに切換える制御を実行することにより前記インジェクタで過電流が発生するのを抑制することを特徴とする。   In order to solve the above-mentioned problems, the present invention provides a gasoline injection output from an electronic control unit in the gasoline injection control apparatus to an existing gasoline injection system controlled by a gasoline injection signal output from the gasoline injection control apparatus. Gasoline alternative gas fuel injection system comprising an electronic control unit in a gasoline alternative gas fuel injection control device that receives a signal and outputs a gas fuel injection signal, and an electromagnetically driven gas fuel injector connected thereto In the fuel supply method of the gas engine implemented in step 1, the electronic control unit in the gasoline alternative gas fuel injection control device is automatically operated at a predetermined timing so that the continuous on-time of the gas fuel injection signal does not exceed a predetermined time. By performing the control to switch off to Characterized in that to prevent the over-current occurs in the data.

本発明は、ガソリン噴射信号のオン時間が想定した範囲を超えるような場合でも、ガス燃料噴射信号のオン時間をエンジン運転制御上必要最低限の燃料流量を確保可能としながら少なくともインジェクタの耐久性を確保できる範囲のオン時間を超えない設定としておくことにより、ガス燃料噴射信号のオン状態の異常な長時間化によりインジェクタに過電流を発生させない。   Even when the on-time of the gasoline injection signal exceeds the assumed range, the present invention makes it possible to ensure at least the durability of the injector while ensuring the minimum fuel flow rate required for engine operation control with respect to the on-time of the gas fuel injection signal. By setting the ON time within a range that can be secured, an overcurrent is not generated in the injector due to an abnormally long ON state of the gas fuel injection signal.

また、このガスエンジンの燃料供給方法において、ガソリン代替ガス燃料噴射制御装置における電子制御ユニットよるガス燃料噴射信号のオン時間には、リミット時間が予め設定されており、このリミット時間に達することによりガス燃料噴射信号をオフに切換えるものとすれば、ガソリン噴射信号のオン時間の推移に縛られることなく自動オフ制御が確実に実行される。   In this gas engine fuel supply method, a limit time is set in advance for the on time of the gas fuel injection signal by the electronic control unit in the gasoline alternative gas fuel injection control device. If the fuel injection signal is switched off, the automatic off control is reliably executed without being restricted by the transition of the on-time of the gasoline injection signal.

さらに、この場合、ガソリン代替ガス燃料噴射制御装置は、入力されたガソリン噴射信号のオフからオンへの変化を検知してから所定のディレイ時間が経過した後、ガス燃料噴射信号をオフからオンに切換えるとともに、このガス燃料噴射信号のオン時間のカウントを開始するものとし、カウント開始後所定時間内にガソリン噴射信号のオンからオフへの変化を検知しなかった場合にガス燃料噴射信号をオフにすることにより、前述のリミット時間到達を確実に検知するとともに有効な自動オフ制御が実行できる。   Further, in this case, the gasoline alternative gas fuel injection control device turns the gas fuel injection signal from OFF to ON after a predetermined delay time has elapsed since the change in the input gasoline injection signal from OFF to ON was detected. At the same time, the counting of the on-time of the gas fuel injection signal is started, and the gas fuel injection signal is turned off when no change from on to off of the gasoline injection signal is detected within a predetermined time after the count starts By doing so, it is possible to reliably detect the arrival of the aforementioned limit time and execute effective automatic OFF control.

さらにまた、上述したガソリン代替ガス燃料噴射システムに配設され、上述したガスエンジンの燃料供給方法を実行するためのプログラムが記憶手段に記憶されており、上述した燃料供給方法を実施するガソリン代替ガス燃料噴射制御装置とすれば、上述した燃料供給方法を確実且つ容易に実現できる。   Furthermore, a program for executing the fuel supply method for the gas engine, which is disposed in the gasoline alternative gas fuel injection system described above, is stored in the storage means, and the gasoline alternative gas for executing the fuel supply method described above is stored. If it is set as a fuel-injection control apparatus, the fuel supply method mentioned above is realizable reliably and easily.

ガス燃料噴射信号の連続したオン時間が所定の時間を超えないように所定のタイミングで自動的にオフに切換える制御を実行するという本発明によると、ガソリン代替ガス燃料噴射制御装置に入力されるガソリン噴射信号のオン時間が想定した場合を超えるような場合でも、インジェクタ・コイルの溶損を有効に防止することができる。   According to the present invention in which the control for automatically switching off the gas fuel injection signal at a predetermined timing so as not to exceed the predetermined time is executed, the gasoline input to the gasoline alternative gas fuel injection control device Even when the on time of the injection signal exceeds the assumed case, it is possible to effectively prevent the injector coil from being melted.

以下に、図面を参照しながら本発明における最良の実施の形態を説明する。   The best mode of the present invention will be described below with reference to the drawings.

図１は、エンジン１に既設のガソリン噴射システムに、ガス燃料がＬＰＧ等の比較的気化し易いものを用いた場合のガソリン代替ガス燃料噴射制御装置を構成するための電子制御ユニット１１と、電磁駆動式でガス燃料用のインジェクタ２を増設してなるガソリン代替ガス燃料噴射システムの配置図を示しており、ガス燃料を充填したボンベの液相部分から延びる送出管路（図示せず）が所定の気化手段を経由して複数のインジェクタ２に接続されており、それらのインジェクタ２が電子制御ユニット１１により駆動制御されるようになっている。   FIG. 1 shows an electronic control unit 11 for constituting a gasoline alternative gas fuel injection control device when a gas fuel that is relatively easily vaporized such as LPG is used for an existing gasoline injection system in an engine 1, and an electromagnetic FIG. 2 is a layout diagram of a gasoline alternative gas fuel injection system in which an injector 2 for gas fuel is added, and a delivery pipe line (not shown) extending from a liquid phase portion of a cylinder filled with gas fuel is shown. These vaporizers are connected to a plurality of injectors 2, and these injectors 2 are driven and controlled by an electronic control unit 11.

本実施の形態は、ガソリン噴射制御装置としての電子制御ユニット１０とガス燃料用のインジェクタ２の前に装着されていたガソリン用インジェクタとを備えたガソリン噴射システムを搭載していた既存のガソリンエンジンを、ガスエンジンに改造するもので、元のガソリン噴射制御装置である電子制御ユニット１０が、スロットル開度センサ８、ＭＡＰセンサ９、Ｏ２センサ６、水温センサ７、クランク角センサ５により検出したエンジン運転状態に基いて算出したガソリン噴射信号を出力し、図示しないガソリン用インジェクタをこの駆動信号に応じたデューティサイクルで開閉動作させ、エンジン要求流量のガソリンを噴射してエンジン１に供給し、点火プラグ４を所定のタイミングで点火させるものであって、このこと自体は周知の技術である。   In this embodiment, an existing gasoline engine equipped with a gasoline injection system including an electronic control unit 10 as a gasoline injection control device and a gasoline injector mounted in front of a gas fuel injector 2 is used. The engine operation detected by the throttle opening sensor 8, the MAP sensor 9, the O 2 sensor 6, the water temperature sensor 7, and the crank angle sensor 5 is converted into a gas engine. A gasoline injection signal calculated based on the state is output, a gasoline injector (not shown) is opened and closed at a duty cycle corresponding to the drive signal, gasoline of an engine required flow rate is injected and supplied to the engine 1, and a spark plug 4 Is ignited at a predetermined timing. It is surgery.

また、本実施の形態では、ガソリン代替ガス燃料噴射制御装置としての電子制御ユニット１１とガス燃料用のインジェクタ２とが前記のガソリン噴射システムを残置させて増設され、ガソリン代替ガス燃料噴射システムを構成する。この場合、図示しないガソリン用インジェクタを撤去してガス燃料用のインジェクタ２と付け替えればよく、電子制御ユニット１０からガソリン用インジェクタに至る気筒毎の信号線をそのまま電子制御ユニット１１につけ替え接続して、入力信号線とすればよい。   In the present embodiment, an electronic control unit 11 as a gasoline alternative gas fuel injection control device and an injector 2 for gas fuel are added to leave the gasoline injection system, thereby constituting a gasoline alternative gas fuel injection system. To do. In this case, the gasoline injector (not shown) may be removed and replaced with the gas fuel injector 2, and the signal line for each cylinder from the electronic control unit 10 to the gasoline injector is replaced and connected to the electronic control unit 11 as it is. An input signal line may be used.

さらに、電子制御ユニット１１は、図示しないＣＰＵ，ＲＯＭ，ＲＡＭ，入出力インターフェース等を備えた汎用の電子制御ユニットを用いることができ、ハードウエアとしては従来のガソリン代替ガス燃料噴射制御装置と同様であるが、そのＲＯＭに以下に述べる本発明のガスエンジンの燃料供給方法を実行するためのプログラムを備えている点を特徴としている。   Furthermore, the electronic control unit 11 can be a general-purpose electronic control unit having a CPU, ROM, RAM, input / output interface, etc. (not shown), and the hardware is the same as that of a conventional gasoline alternative gas fuel injection control device. However, the ROM is provided with a program for executing the fuel supply method of the gas engine of the present invention described below.

電子制御ユニット１１は、図２の機能ブロック図に示す様に、ガソリン噴射制御装置としての電子制御ユニット１０からエンジン運転状態に応じて出力されるガソリン噴射信号を送信する信号線を介して入力したガソリン噴射信号Ｉ１〜Ｉｎに基いて、所定の補正係数を掛ける等してガス燃料の適正な噴射量を算出し、この算出されたガス燃料噴射量を与えるガス燃料噴射信号Ｏ１〜Ｏ２を、駆動信号線を介して気筒毎にインジェクタ２に出力するものであり、この機能については従来のガソリン代替ガス燃料噴射制御装置と共通している。   As shown in the functional block diagram of FIG. 2, the electronic control unit 11 is input via a signal line that transmits a gasoline injection signal output from the electronic control unit 10 as a gasoline injection control device according to the engine operating state. Based on the gasoline injection signals I1 to In, an appropriate injection amount of gas fuel is calculated by multiplying a predetermined correction coefficient, etc., and the gas fuel injection signals O1 to O2 that give the calculated gas fuel injection amount are driven. This is output to the injector 2 for each cylinder via a signal line, and this function is common to the conventional gasoline alternative gas fuel injection control device.

この機能に加えて、電子制御ユニット１１にはガス燃料噴射信号Ｏｎのオン時間が予め定めた所定の時間を超えないように自動的にオフにする噴射信号自動切替手段を機能的に備えており、ガス燃料噴射信号Ｏｎが異常に長時間化することによるインジェクタ２における過電流の発生を抑制して、インジェクタ・コイルの溶損を防止するような制御を実行する点を特徴としている。   In addition to this function, the electronic control unit 11 is functionally equipped with an injection signal automatic switching means that automatically turns off the gas fuel injection signal On so that it does not exceed a predetermined time. Further, the present invention is characterized in that control is performed to prevent the injector coil from being melted by suppressing the occurrence of overcurrent in the injector 2 due to an abnormally long gas fuel injection signal On.

即ち、電子制御ユニット１１の記憶手段であるＲＯＭには、本実施の形態で詳述するガスエンジンの燃料供給方法の手順を実行するためのプログラムが記憶されている。   That is, the ROM that is the storage means of the electronic control unit 11 stores a program for executing the procedure of the fuel supply method for the gas engine described in detail in the present embodiment.

次に、前記ガスエンジンの燃料供給方法を実施する電子制御ユニット１１の動作については、図３のフローチャート及び図４の波形図を参照して詳細に説明する。   Next, the operation of the electronic control unit 11 that implements the fuel supply method of the gas engine will be described in detail with reference to the flowchart of FIG. 3 and the waveform diagram of FIG.

図３のフローチャートによると、ガソリン噴射信号Ｉｎが入力されているガソリン代替ガス燃料噴射制御装置としての電子制御ユニット１１は、ガソリン噴射時信号Ｉｎのオフからオンへの変化を検知したか否かを判定し（Ａ１）、検知しない場合ははじめに戻り、検知した場合は、検知後にディレイ時間ｔ１を経過したか否かを判定（Ａ２）する。経過していない場合は、再度同じ判定を行い、経過している場合はガス燃料噴射信号Ｏｎをオフからオンに切り換える（Ａ３）。   According to the flowchart of FIG. 3, the electronic control unit 11 as the gasoline alternative gas fuel injection control device to which the gasoline injection signal In is input has detected whether or not the change in the gasoline injection signal In has been detected from OFF to ON. If it is determined (A1) and not detected, the process returns to the beginning. If detected, it is determined (A2) whether or not the delay time t1 has elapsed after detection. If it has not elapsed, the same determination is performed again. If it has elapsed, the gas fuel injection signal On is switched from OFF to ON (A3).

次に、ガソリン噴射信号Ｉｎのオンからオフへの変化を検知したか否かを判定し（Ａ４）、検知した場合はガス燃料噴射信号Ｏｎをオンからオフへ切換えて（Ｂ１）最初に戻り、検知しない場合はガス燃料噴射信号Ｏｎのオン時間が予め定めた時間ｔ２以上となっているか否かを判定する（Ａ５）（図４参照）。   Next, it is determined whether or not a change in the gasoline injection signal In from on to off is detected (A4). If detected, the gas fuel injection signal On is switched from on to off (B1), and the process returns to the beginning. If not detected, it is determined whether the on time of the gas fuel injection signal On is equal to or longer than a predetermined time t2 (A5) (see FIG. 4).

そして、ガス燃料噴射信号Ｏｎのオン時間が予め定めた時間ｔ２以上となっていない場合は（Ａ４）の判定に戻り、所定時間以上となっている場合はガス燃料噴射信号Ｏｎをオンからオフへ自動切り換えして（Ａ６）はじめに戻る。このように、カウント開始後所定時間ｔ２内にガソリン噴射信号Ｉｎのオンからオフへの変化を検知しない場合だけ、自動的にガス燃料噴射信号Ｏｎをオフにするものである。   When the on time of the gas fuel injection signal On is not equal to or longer than the predetermined time t2, the process returns to the determination of (A4), and when it is equal to or longer than the predetermined time, the gas fuel injection signal On is changed from on to off. Switch automatically (A6) and return to the beginning. As described above, the gas fuel injection signal On is automatically turned off only when the change of the gasoline injection signal In from on to off is not detected within the predetermined time t2 after the start of counting.

このような制御をガソリン代替ガス燃料噴射制御装置である電子制御ユニット１１により実行することにより、ガソリン噴射信号Ｉｎのオン時間が想定した場合を超えるような場合であっても、インジェクタ２に過電流が発生することを抑制しながら空燃比がリーンまたはリッチに偏らずにエンジン運転の安定性を維持する燃料流量を確保できるオン時間内に、ガス燃料噴射信号Ｏｎをコントロールすることができる。   By executing such control by the electronic control unit 11 which is a gasoline alternative gas fuel injection control device, even if the on-time of the gasoline injection signal In exceeds the assumed case, an overcurrent is supplied to the injector 2. It is possible to control the gas fuel injection signal On within the on-time that can secure the fuel flow rate that maintains the stability of the engine operation without the occurrence of lean or rich air-fuel ratio while suppressing the occurrence of.

以上、本発明によれば、ガソリン噴射システムを利用したガソリン代替ガス燃料噴射システムについて、本発明によりガソリン噴射信号のオン時間が想定した場合を超えるような場合でも、インジェクタ・コイルが溶損することを有効に防止することができる。   As described above, according to the present invention, in the alternative fuel gas fuel injection system using the gasoline injection system, the injector coil is melted even when the on-time of the gasoline injection signal is exceeded by the present invention. It can be effectively prevented.

本発明における実施の形態及び従来例に共通した燃料供給システムの配置図。The layout of the fuel supply system common to embodiment and the prior art example in this invention. 図１の燃料供給システムにおける信号の流れを示す機能ブロック図。The functional block diagram which shows the flow of the signal in the fuel supply system of FIG. 本発明における実施の形態であるガソリン代替ガス燃料噴射制御装置の制御内容を示すフローチャート。The flowchart which shows the control content of the gasoline alternative gas fuel injection control apparatus which is embodiment in this invention. 図３のフローチャートによるガソリン代替ガス燃料噴射制御装置の制御状態の一例を示す波形図。The wave form diagram which shows an example of the control state of the gasoline alternative gas fuel injection control apparatus by the flowchart of FIG. 従来例による制御状態を示す波形図。The wave form diagram which shows the control state by a prior art example.

符号の説明Explanation of symbols

１ エンジン、２ インジェクタ、１０，１１ 電子制御ユニット
1 engine, 2 injectors, 10, 11 electronic control unit

Claims (3)

ガソリン噴射制御装置から出力されるガソリン噴射信号により制御されるエンジン既設のガソリン噴射システムに、前記ガソリン噴射制御装置における電子制御ユニットが出力するガソリン噴射信号を受信しガス燃料噴射信号を出力するガソリン代替ガス燃料噴射制御装置における電子制御ユニットと、これに接続された電磁駆動式でガス燃料用のインジェクタとを増設してなるガソリン代替ガス燃料噴射システムで実施されるガスエンジンの燃料供給方法において、前記ガソリン代替ガス燃料噴射制御装置における電子制御ユニットがガソリン噴射時信号のオフからオンへの変化を検知したか否かを判定し、検知した場合は、検知後にディレイ時間を経過したか否かを判定して、経過している場合はガス燃料噴射信号をオフからオンに切り換える。次に、ガソリン噴射信号のオンからオフへの変化を検知したか否かを判定し、検知しない場合はガス燃料噴射信号のオン時間が予め定めた時間以上となっているか否かを判定し、カウント開始後所定時間内にガソリン噴射信号のオンからオフへの変化を検知しない場合だけ、自動的にガス燃料噴射信号をオフにする制御を実行することにより、ガソリン噴射信号のオン時間が想定した場合を超えるような場合であっても、インジェクタに過電流が発生することを抑制しながら空燃比がリーンまたはリッチに偏らずにエンジン運転の安定性を維持する燃料流量を確保できるオン時間内に前記ガス燃料噴射信号の連続したオン時間が所定の時間を超えないように所定のタイミングで自動的にオフに切換える制御を実行することにより前記インジェクタで過電流が発生するのを抑制することを特徴とするガスエンジンの燃料供給方法。 Gasoline alternative for receiving gasoline injection signal output from electronic control unit in gasoline injection control device and outputting gas fuel injection signal to existing gasoline injection system controlled by gasoline injection signal output from gasoline injection control device In a fuel supply method for a gas engine implemented in a gasoline alternative gas fuel injection system comprising an electronic control unit in a gas fuel injection control device and an electromagnetically driven gas fuel injector connected to the electronic control unit. Determine whether the electronic control unit in the gasoline alternative gas fuel injection control device has detected a change from off to on in the gasoline injection signal, and if so, determine whether the delay time has elapsed after detection. If so, switch the gas fuel injection signal from off to on. Obtain. Next, it is determined whether or not a change from on to off of the gasoline injection signal is detected, and if not detected, it is determined whether or not the on time of the gas fuel injection signal is equal to or longer than a predetermined time, The on-time of the gasoline injection signal is assumed by executing the control to automatically turn off the gas fuel injection signal only when the change from on to off of the gasoline injection signal is not detected within a predetermined time after the count starts. Even if it exceeds the case, the fuel flow rate can be secured within the on-time period to maintain the stability of engine operation without suppressing the air-fuel ratio leaning or rich while suppressing the occurrence of overcurrent in the injector. By performing control to automatically switch off the gas fuel injection signal at a predetermined timing so that the continuous on time does not exceed a predetermined time. The fuel supply method for a gas engine, characterized in that to prevent the over-current occurs in the data. 前記ガス燃料噴射信号のオン時間にはリミット時間が予め設定されており、このリミット時間に達すると前記ガス燃料噴射信号がオフに切換わることを特徴とする請求項１に記載したガスエンジンの燃料供給方法。   2. The gas engine fuel according to claim 1, wherein a limit time is preset for an on time of the gas fuel injection signal, and the gas fuel injection signal is switched off when the limit time is reached. Supply method. 前記ガソリン代替ガス燃料噴射システムに配設され、請求項１または２に記載したガスエンジンの燃料供給方法を実行するためのプログラムが記憶手段に記憶されており、前記燃料供給方法を実施するガソリン代替ガス燃料噴射制御装置。   A gasoline alternative that is arranged in the gasoline alternative gas fuel injection system and that stores a program for executing the fuel supply method of the gas engine according to claim 1 or 2 and that executes the fuel supply method. Gas fuel injection control device.
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