JP2008115737A - Fuel supply control device in gas engine - Google Patents

Fuel supply control device in gas engine Download PDF

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JP2008115737A
JP2008115737A JP2006298848A JP2006298848A JP2008115737A JP 2008115737 A JP2008115737 A JP 2008115737A JP 2006298848 A JP2006298848 A JP 2006298848A JP 2006298848 A JP2006298848 A JP 2006298848A JP 2008115737 A JP2008115737 A JP 2008115737A
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load
fuel
fuel supply
pressure
gas engine
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JP5094092B2 (en
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Toru Hashimoto
徹 橋本
Satoru Goto
悟 後藤
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Niigata Power Systems Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To continue operation without causing an engine stall when its load is shut off. <P>SOLUTION: A fuel supply control device 1 is provided with a load detection part 18 detecting load quantity of the gas engine E; a shut off load judgment part 17 judging existence of load shut off, determining load shut off quantity at load shut off based on load quantity input from an electric power load detection part 18, judging whether load shut off quantity is equal to or greater than an established value, and outputting operation command when load shut off is equal to or greater than an established value, and outputting operation command; and a pressure regulating valve control part 15 operating with operation command i2 output by the shut off load judgment part 17 and operating a pressure regulating valve 7 of a fuel main pipe 6 with keeping gain in feed back control of fuel supply pressure high for a certain period of time. A fuel discharge pipe 10 provided with an open close valve 9 is connected to the fuel gas main pipe 6. The open close valve 9 is opened for a predetermined period of time with operation command i3 output by the shut off load judgment, and fuel gas is discharged from the fuel gas main pipe 6 through the fuel gas discharge pipe 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、負荷遮断時にガスエンジンが失速することなく運転を継続することができるガスエンジンにおける燃料供給制御装置に関するものである。   The present invention relates to a fuel supply control device in a gas engine that can continue operation without stalling the gas engine when the load is interrupted.

従来、電子燃料噴射式ガスエンジンは、過給機からシリンダに導入される圧縮空気の給気圧を検出すると共に、燃料ガス供給源から電磁弁によって流路を開閉制御される燃料供給管を通してシリンダ内に供給される燃料ガスの燃料供給圧を検出し、前記給気圧と燃料供給圧との差圧が一定になるように、燃料供給管の上流側に設けた調圧弁をＰＩＤ制御によって動作させるようにしている。しかし、ガスエンジンが負荷を定格出力から瞬時に無負荷あるいは部分負荷に変化された場合には、給気圧が負荷の低下に伴う過給機吐出圧の低下により速やかに低下するのに対して、燃料ガスの供給圧は、元圧が一定であること、および負荷が下がることにより燃料ガスの消費量が減ることから、圧力低下の速度が遅くなり、その結果、前記燃料供給圧と給気圧との差圧が増加して、前記電磁弁が開かなくなり、ガスエンジンが失火して失速することがある。   2. Description of the Related Art Conventionally, an electronic fuel injection type gas engine detects the supply air pressure of compressed air introduced from a supercharger into a cylinder, and passes through a fuel supply pipe whose opening and closing is controlled by a solenoid valve from a fuel gas supply source. The pressure control valve provided on the upstream side of the fuel supply pipe is operated by PID control so that the pressure difference between the fuel supply pressure and the fuel supply pressure is constant. I have to. However, when the gas engine changes the load from the rated output instantaneously to no load or partial load, the supply air pressure decreases rapidly due to the decrease in the supercharger discharge pressure accompanying the decrease in load, The supply pressure of the fuel gas is constant because the pressure of the fuel gas is reduced due to a constant source pressure and a decrease in load. May increase, the solenoid valve will not open, and the gas engine may misfire and stall.

そこで、電子燃料噴射式ガスエンジンにおける燃料供給制御装置として、給気ダクトを介して吸入した空気を圧縮して給気管によってシリンダ内に供給する過給機と、調圧弁で圧力を調節した燃料ガスを電磁弁の開閉によってシリンダに供給する燃料供給管と、該燃料供給管に開閉弁を有する配管を介して連絡されると共に、スロットル弁を有する管路を介して前記過給機の空気吸入側に連絡され、前記配管から供給される燃料ガスを空気と混合するキャブレターと、開閉制御弁を有し前記過給機を迂回して前記給気ダクトと給気管を連絡するバイパス管と、前記電磁弁、開閉弁、開閉制御弁、スロットル弁の各開閉動作を、ガスエンジンの負荷に応じて切り換えて制御する制御装置とを備え、ガスエンジンの起動時および低負荷時に、燃料供給管から供給された燃料ガスをキャブレターによって空気と混合し、この混合気を過給機で圧縮してシリンダに供給することにより、シリンダ内で混合気の燃焼を失火無く行わせ、ガスエンジンの中、高負荷時に、前記電磁弁を開いて前記燃料供給管から供給される燃料ガスを過給機で圧縮された空気と混合してシリンダに供給して燃焼させるようにしたものが知られている（例えば、特許文献１参照）。
特開２００５−５４６１３号公報 Therefore, as a fuel supply control device in an electronic fuel injection type gas engine, a supercharger that compresses air sucked through an air supply duct and supplies the compressed air into the cylinder by an air supply pipe, and a fuel gas whose pressure is adjusted by a pressure regulating valve Is connected to the fuel supply pipe via a pipe having an opening / closing valve, and is connected to the fuel supply pipe via a pipe having a throttle valve. A carburetor that mixes fuel gas supplied from the pipe with air, a bypass pipe that has an open / close control valve and bypasses the turbocharger and connects the supply duct and the supply pipe, and the electromagnetic And a control device that switches and controls each opening / closing operation of the valve, the opening / closing valve, the opening / closing control valve, and the throttle valve according to the load of the gas engine. The fuel gas supplied from the supply pipe is mixed with air by a carburetor, and this air-fuel mixture is compressed by a supercharger and supplied to the cylinder, so that the air-fuel mixture is burned in the cylinder without misfire. It is known that the fuel gas supplied from the fuel supply pipe is mixed with air compressed by a supercharger and supplied to the cylinder for combustion during medium and high loads. (For example, refer to Patent Document 1).
JP 2005-54613 A

しかしながら、従来の電子燃料噴射式ガスエンジンの燃料供給制御装置においては、起動時および低負荷時の運転に対応させるために、燃料供給管から供給された燃料ガスをキャブレターによって空気と混合し過給機の給気ダクトに供給する経路を付加的に有していることから、制御装置の構成が複雑になると共に、発電用ガスエンジンが停電等の発生により、負荷が定格出力から無負荷に急変したような場合には、その変化に適切に対応して安定に燃焼運転を継続できないおそれがあった。   However, in the conventional fuel supply control device for an electronic fuel injection gas engine, in order to cope with the operation at the time of start-up and low load, the fuel gas supplied from the fuel supply pipe is mixed with air by a carburetor and supercharged. Since the system has an additional supply path to the air supply duct of the machine, the configuration of the control device becomes complicated, and the power generation gas engine suddenly changes from the rated output to no load due to the occurrence of a power failure, etc. In such a case, there is a fear that the combustion operation cannot be stably continued in response to the change appropriately.

本発明は、上記事情に鑑みてなされたものであって、負荷遮断時にガスエンジンが失速することなく運転を継続することができるガスエンジンにおける燃料供給制御装置を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fuel supply control device in a gas engine that can continue operation without stalling the gas engine when the load is interrupted.

本発明は、前記課題を解決するために、以下の構成としたことを特徴としている。
すなわち、請求項１に係るガスエンジンにおける燃料供給制御装置は、過給機からシリンダに導入される圧縮空気の給気圧を検出すると共に、燃料ガス供給源から燃料供給弁によって流路を開閉制御される燃料供給管を通してシリンダ内に供給される燃料ガスの燃料供給圧を検出し、前記給気圧と燃料供給圧との差圧がガスエンジンの負荷に応じて調整されるように、制御手段によって前記燃料供給管の入口に設けた調圧弁を動作させてフィードバック制御により、前記燃料供給管に導入される燃料ガスの圧力を制御するようにしたガスエンジンにおける燃料供給制御装置において、前記制御手段が、ガスエンジンの負荷量を検出する負荷検出部と、ガスエンジンの負荷遮断の有無を判定すると共に、該負荷検出部から入力される負荷量にもとづいてガスエンジンの負荷遮断時における負荷遮断量を求め、該負荷遮断量が設定値以上か否かを判断し、設定値以上の時に動作指令を出力する遮断負荷判断部と、該遮断負荷判断部から出力された動作指令によって動作し、前記フィードバック制御におけるゲインを一定時間だけ高めて前記調圧弁を動作させる調圧弁制御部とを備えていることを特徴としている。 In order to solve the above-mentioned problems, the present invention is characterized by the following configuration.
That is, the fuel supply control apparatus for a gas engine according to claim 1 detects the supply pressure of compressed air introduced from the supercharger into the cylinder, and is controlled to open and close the flow path from the fuel gas supply source by the fuel supply valve. The control means detects the fuel supply pressure of the fuel gas supplied into the cylinder through the fuel supply pipe and adjusts the differential pressure between the supply pressure and the fuel supply pressure according to the load of the gas engine. In a fuel supply control apparatus in a gas engine that operates a pressure regulating valve provided at an inlet of a fuel supply pipe to control the pressure of the fuel gas introduced into the fuel supply pipe by feedback control, the control means includes: A load detection unit for detecting the load amount of the gas engine and whether or not the gas engine load is interrupted are determined and the load amount input from the load detection unit is also determined. Accordingly, a load cutoff amount at the time of load cutoff of the gas engine is obtained, a determination is made as to whether or not the load cutoff amount is equal to or greater than a set value, and an interrupt command is output when the load cutoff amount is equal to or greater than the set value; And a pressure regulating valve control unit that operates according to an operation command output from the unit and operates the pressure regulating valve by increasing a gain in the feedback control for a certain period of time.

請求項２に係るガスエンジンにおける燃料供給制御装置は、請求項１に記載の燃料供給制御装置において、前記燃料供給管に開閉弁を設けた燃料ガス放出管が接続されており、前記遮断負荷判断部から出力された動作指令によって前記開閉弁が所定時間だけ開弁されて、前記燃料供給管から燃料ガスが放出されるようになっていることを特徴としている。   A fuel supply control apparatus for a gas engine according to claim 2 is the fuel supply control apparatus according to claim 1, wherein a fuel gas discharge pipe provided with an open / close valve is connected to the fuel supply pipe, and the shutoff load determination is performed. The on-off valve is opened for a predetermined time by an operation command output from the section, and fuel gas is discharged from the fuel supply pipe.

請求項３に係るガスエンジンにおける燃料供給制御装置は、過給機からシリンダに導入される圧縮空気の給気圧を検出すると共に、燃料ガス供給源から燃料供給弁によって流路を開閉制御される燃料供給管を通してシリンダ内に供給される燃料ガスの燃料供給圧を検出し、前記給気圧と燃料供給圧との差圧がガスエンジンの負荷に応じて調整されるように、制御手段によって前記燃料供給管の入口に設けた調圧弁を動作させてフィードバック制御により、前記燃料供給管に導入される燃料ガスの圧力を制御するようにしたガスエンジンにおける燃料供給制御装置において、前記燃料供給管に開閉弁を設けた燃料ガス放出管が接続されており、前記制御手段が、ガスエンジンの負荷量を検出する負荷検出部と、ガスエンジンの負荷遮断の有無を判定すると共に、該負荷検出部から入力される負荷量にもとづいてガスエンジンの負荷遮断時における負荷遮断量を求め、該負荷遮断量が設定値以上か否かを判断し、設定値以上の時に動作指令を出力する遮断負荷判断部とを備えており、該遮断負荷判断部から出力された動作指令によって前記開閉弁が所定時間だけ開弁されて、前記燃料供給管から燃料ガスが放出されるようになっていることを特徴としている。   A fuel supply control apparatus for a gas engine according to claim 3 detects a supply pressure of compressed air introduced from a supercharger into a cylinder, and is controlled to open and close a flow path from a fuel gas supply source by a fuel supply valve. The fuel supply pressure of the fuel gas supplied into the cylinder through the supply pipe is detected, and the fuel supply is controlled by the control means so that the differential pressure between the supply pressure and the fuel supply pressure is adjusted according to the load of the gas engine. In a fuel supply control apparatus for a gas engine, wherein a pressure control valve provided at an inlet of a pipe is operated to control a pressure of a fuel gas introduced into the fuel supply pipe by feedback control, an open / close valve is provided in the fuel supply pipe A fuel gas discharge pipe provided with a gas engine is connected, and the control means detects a load amount of the gas engine and whether or not the load of the gas engine is interrupted. And determining the load shut-off amount at the time of load shut-off of the gas engine based on the load amount input from the load detection unit, determining whether or not the load shut-off amount is equal to or greater than a set value. A shut-off load determination unit that outputs an operation command, and the on-off valve is opened for a predetermined time by the operation command output from the shut-off load determination unit, and fuel gas is released from the fuel supply pipe. It is characterized by that.

本発明によれば、以下の優れた効果を奏する。
すなわち、請求項１に係るガスエンジンにおける燃料供給制御装置によれば、負荷遮断時に、調圧弁制御部によって燃料供給管内の燃料供給圧のフィードバック制御におけるゲインが一定時間だけ高められることにより、調圧弁が敏感に動作して燃料供給管内の燃料ガスの圧力を瞬時に下げるので、燃料供給管の燃料供給弁の入口と出口の差圧を適切に維持することができ、これにより、前記燃料供給弁の開閉動作を確実に行わせて、燃料ガスのシリンダ内への供給を確保することができ、負荷遮断時においても、ガスエンジンが失速することなく運転を継続することができる。 The present invention has the following excellent effects.
That is, according to the fuel supply control apparatus for a gas engine according to claim 1, when the load is cut off, the pressure adjustment valve control unit increases the gain in the feedback control of the fuel supply pressure in the fuel supply pipe for a certain period of time. Operates sensitively and instantaneously lowers the pressure of the fuel gas in the fuel supply pipe, so that the differential pressure between the inlet and outlet of the fuel supply valve of the fuel supply pipe can be appropriately maintained, and thereby the fuel supply valve Thus, the fuel gas can be reliably supplied to the cylinder, and the operation can be continued without stalling the gas engine even when the load is interrupted.

請求項２に係るガスエンジンにおける燃料供給制御装置によれば、負荷遮断時に、調圧弁の動作によって燃料供給管内の燃料ガスの圧力を瞬時に下げることに加えて、遮断負荷判断部によって所定時間だけ開閉弁を開弁させることにより、燃料供給管内の燃料ガスを燃料ガス放出管から速やかに放出させることができるので、燃料供給管内の燃料ガスの圧力を一層効果的に下げることができ、負荷遮断時におけるガスエンジンの失速運転の防止効果を高めることができる。   According to the fuel supply control apparatus for a gas engine according to claim 2, in addition to instantaneously lowering the pressure of the fuel gas in the fuel supply pipe by the operation of the pressure regulating valve when the load is shut off, the shut-off load determining unit performs only a predetermined time. By opening the on-off valve, the fuel gas in the fuel supply pipe can be quickly released from the fuel gas discharge pipe, so the pressure of the fuel gas in the fuel supply pipe can be reduced more effectively and the load can be cut off. The effect of preventing the stall operation of the gas engine at the time can be enhanced.

請求項３に係るガスエンジンにおける燃料供給制御装置によれば、負荷遮断時に、遮断負荷判断部によって所定時間だけ開閉弁を開弁させることにより、燃料供給管内の燃料ガスを燃料ガス放出管から速やかに放出させて、燃料供給管内の燃料ガスの圧力を効果的に下げることができるので、調圧弁を動作させて行う燃料供給管内の燃料供給圧のフィードバック制御系の構成が複雑になることがなく、前記燃料供給管の燃料供給弁の入口と出口の差圧を適切に維持して前記燃料供給弁の開閉動作を確実に行わせることができ、負荷遮断時においてもガスエンジンが失速することなく運転を継続することができる。   According to the fuel supply control apparatus for a gas engine according to claim 3, when the load is shut off, the shut-off load determination unit opens the on-off valve for a predetermined time, so that the fuel gas in the fuel supply pipe is quickly discharged from the fuel gas discharge pipe. The pressure of the fuel gas in the fuel supply pipe can be effectively reduced, so that the configuration of the feedback control system for the fuel supply pressure in the fuel supply pipe performed by operating the pressure regulating valve is not complicated. The fuel supply valve can be reliably opened and closed by properly maintaining the differential pressure between the inlet and outlet of the fuel supply valve of the fuel supply pipe without causing the gas engine to stall even when the load is shut off. Driving can be continued.

以下、本発明の一実施の形態に係るガスエンジンにおける燃料供給制御装置について添付図面を参照して説明する。
先ず、本発明の一実施の形態に係るガスエンジンにおける燃料供給制御装置１を備えたガスエンジンＥは、図１に示すように、複数のシリンダを有するエンジン本体２の上部に前記各シリンダおよびシリンダ内のピストンと共に主燃焼室を区画形成する複数のシリンダヘッド３が設けられている。前記各シリンダヘッド３には、図示しないが、それらの吸気ポートに過給機からシリンダ本体２設けた給気室（または給気主管と各給気枝管を有するガスエンジンではそれらの主管、枝管）を通して圧縮空気が導入されるようになっている。また、前記各シリンダヘッド３には、燃料供給電磁弁（燃料供給弁）４を有し一端を前記各吸気ポート（または給気主管と各給気枝管を有するガスエンジンでは吸気ポートの近くで前記各給気枝管）にそれぞれ連通する複数の燃料ガス枝管（燃料供給管）５が接続されており、該各燃料ガス枝管５の他端は燃料ガス主管（燃料供給管）６に個々に連絡されている。 Hereinafter, a fuel supply control device in a gas engine according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, as shown in FIG. 1, a gas engine E equipped with a fuel supply control device 1 for a gas engine according to an embodiment of the present invention has the cylinders and cylinders disposed above an engine body 2 having a plurality of cylinders. A plurality of cylinder heads 3 are provided for defining the main combustion chamber together with the inner piston. Although not shown, each cylinder head 3 has an air supply chamber (or an air supply main pipe and each supply branch pipe in a gas engine having a cylinder main body 2 provided from a supercharger to the intake port thereof. Compressed air is introduced through the tube. Each cylinder head 3 has a fuel supply solenoid valve (fuel supply valve) 4 and one end of each cylinder head 3 near the intake port (or in the case of a gas engine having an intake main pipe and an intake branch pipe). A plurality of fuel gas branch pipes (fuel supply pipes) 5 communicating with the respective air supply branch pipes) are connected, and the other end of each fuel gas branch pipe 5 is connected to a fuel gas main pipe (fuel supply pipe) 6. Have been contacted individually.

そして、前記燃料ガス主管６の一端（上流側端部、図１で左端部）は、制御エアａで作動される調圧弁７を有する燃料管（燃料供給管）８によって燃料ガス供給源（図示せず）に連絡されていると共に、前記燃料ガス主管６の他端（下流側端部、図１で右端部）は、ボールバルブ等の開閉弁９を有する燃料ガス放出管１０に連絡されている。前記開閉弁９は、電磁弁１１を有する配管１２から供給されるエアＡによって開閉作動されるようになっている。前記給気室（または給気主管）には各シリンダ内への給気圧を検出する給気圧検出器１３が設けられ、前記燃料ガス主管６には、燃料ガス主管６内における燃料ガスの供給圧を検出する燃料供給圧検出器１４が設けられている。   One end (upstream end portion, left end portion in FIG. 1) of the fuel gas main pipe 6 is connected to a fuel gas supply source (figure) by a fuel pipe (fuel supply pipe) 8 having a pressure regulating valve 7 operated by control air a. The other end (downstream end, right end in FIG. 1) of the fuel gas main pipe 6 is connected to a fuel gas discharge pipe 10 having an on-off valve 9 such as a ball valve. Yes. The on-off valve 9 is opened and closed by air A supplied from a pipe 12 having an electromagnetic valve 11. The supply chamber (or supply main pipe) is provided with a supply pressure detector 13 for detecting the supply air pressure into each cylinder, and the fuel gas main pipe 6 has a fuel gas supply pressure in the fuel gas main pipe 6. A fuel supply pressure detector 14 is provided to detect the above.

しかして、前記ガスエンジンＥは、燃料供給源から前記燃料管８を経て前記調圧弁７で圧力を調整された後、前記燃料ガス主管６を通って燃料供給電磁弁４で流量を調整されながら、前記燃料ガス枝管５によって前記吸気ポートに供給された燃料ガスと、前記過給機から給気室を通して吸気ポートに供給された圧縮空気とが混合され、この混合気がシリンダの主燃焼室内に導入されてピストンによって圧縮され、適宜着火手段によって着火燃焼されて回転出力を得て、この回転出力により発電装置Ｇを駆動するようになっている。   Thus, the gas engine E is adjusted in pressure by the pressure regulating valve 7 from the fuel supply source through the fuel pipe 8 and then adjusted in flow rate by the fuel supply electromagnetic valve 4 through the fuel gas main pipe 6. The fuel gas supplied to the intake port by the fuel gas branch pipe 5 is mixed with the compressed air supplied from the supercharger to the intake port through the supply chamber, and this mixture is mixed with the main combustion chamber of the cylinder. And is compressed by a piston, and is ignited and combusted appropriately by an igniting means to obtain a rotational output, and the power generator G is driven by this rotational output.

次に、本発明の一実施の形態に係るガスエンジンにおける燃料供給制御装置１は、燃料供給源から前記ガスエンジンＥのシリンダへの燃料ガスの燃料供給圧を制御する調圧弁制御部（制御手段）１５を備えている。該調圧弁制御部１５は、前記給気圧検出器１３によって検出される給気圧（電流信号）Ｐａと前記燃料供給圧検出器１４によって検出される燃料供給圧（電流信号）Ｐｆとを入力し、それらの差圧が発電装置Ｇの発電電力（ガスエンジンＥの負荷）ｈ（後述）毎に設定された目標値になるようにＰＩＤ計算を行い、このＰＩＤ計算によって得られた制御信号（電気信号）ｉ１を電空変換器（制御手段）１６に出力するようになっている。   Next, the fuel supply control device 1 for a gas engine according to an embodiment of the present invention includes a pressure regulating valve control unit (control means) that controls the fuel supply pressure of fuel gas from a fuel supply source to the cylinder of the gas engine E ) 15. The pressure regulating valve control unit 15 inputs a supply air pressure (current signal) Pa detected by the supply air pressure detector 13 and a fuel supply pressure (current signal) Pf detected by the fuel supply pressure detector 14. PID calculation is performed so that the differential pressure becomes a target value set for each of the generated power (load of the gas engine E) h (described later) of the power generator G, and a control signal (electrical signal) obtained by the PID calculation is calculated. ) I1 is output to the electropneumatic converter (control means) 16.

前記電空変換器１６は、前記調圧弁制御部１５からの制御信号ｉ１を入力し、その大きさに応じて、圧縮空気源から器内に供給されたエアＡの圧力を変化させて前記調圧弁７に制御エアａを供給するようになっている。前記調圧弁７は、前記電空変換器１６からの制御エアａによってバイアス圧を掛けられてバルブの開度を調整され、出口圧（前記燃料管８から燃料ガス主管６に流れる燃料ガスの圧力）を変更調節するようになっている。
すなわち、前記調圧弁制御部１５は、前記給気圧Ｐａと燃料供給圧Ｐｆとの差圧がガスエンジンの負荷に応じて調整されるように、前記燃料ガス主管６の入口側に設けた調圧弁７を動作させてフィードバック制御により、前記燃料ガス主管６に導入される燃料ガスの圧力を制御するようになっている。 The electropneumatic converter 16 receives the control signal i1 from the pressure regulating valve control unit 15 and changes the pressure of the air A supplied from the compressed air source into the chamber according to the magnitude thereof. Control air a is supplied to the pressure valve 7. The pressure regulating valve 7 is biased by the control air a from the electropneumatic converter 16 so that the opening of the valve is adjusted, and the outlet pressure (the pressure of the fuel gas flowing from the fuel pipe 8 to the fuel gas main pipe 6). ) Change and adjust.
That is, the pressure regulating valve controller 15 is a pressure regulating valve provided on the inlet side of the fuel gas main pipe 6 so that the differential pressure between the supply air pressure Pa and the fuel supply pressure Pf is adjusted according to the load of the gas engine. 7, the pressure of the fuel gas introduced into the fuel gas main pipe 6 is controlled by feedback control.

さらに、前記燃料供給制御装置１は遮断負荷判断部（制御手段）１７を備えている。該遮断負荷判断部１７には、前記発電装置Ｇによって発電された電力を計測する電力トランスデューサからなる負荷検出部１８が接続され、前記ガスエンジンＥに対する負荷（電力）ｈが入力されると共に、遮断器の開閉による発電装置Ｇからの電力の供給、遮断信号（ガスエンジンＥに対する負荷ｈの断続信号）ｂが入力されるようになっている。そして、前記遮断負荷判断部１７は、前記遮断器から入力された前記負荷断続信号ｂが負荷ｈの遮断信号ｂ１であるときは、前記負荷検出部１８から入力された負荷ｈにもとづいて負荷遮断時の負荷量（負荷遮断量）ｈ１を求め、この負荷遮断量ｈ１が設定遮断負荷量（設定値）ｈｓ以上である場合には、前記調圧弁制御部１５に動作信号ｉ２を送信すると共に、前記配管１２の電磁弁１１にタイマで設定された所定時間（保持時間）だけ動作指令（制御電圧）ｉ３を与えて開弁させるようにようになっている。   Further, the fuel supply control device 1 includes an interrupt load determination unit (control means) 17. A load detection unit 18 comprising a power transducer for measuring the power generated by the power generation device G is connected to the interrupting load determination unit 17, and a load (electric power) h for the gas engine E is input to the interrupting load determination unit 17. Supply of electric power from the power generator G by opening and closing of the generator, and a cut-off signal (interrupt signal of the load h to the gas engine E) b are input. When the load interrupt signal b input from the circuit breaker is the interrupt signal b1 of the load h, the interrupt load determination unit 17 performs load interrupt based on the load h input from the load detection unit 18. Load amount (load cutoff amount) h1 is obtained, and when the load cutoff amount h1 is equal to or greater than a set cutoff load amount (set value) hs, an operation signal i2 is transmitted to the pressure regulating valve control unit 15, and An operation command (control voltage) i3 is given to the electromagnetic valve 11 of the pipe 12 for a predetermined time (holding time) set by a timer to open the valve.

前記調圧弁制御部１５は、前記遮断負荷判断部１７から動作信号ｉ２が入力されると、内部のＰＩＤ演算器のゲイン設定要素をタイマで設定された一定時間（保持時間）だけ変更して前記フィードバック制御（フィードバックループ）におけるゲインを高めて制御電流ｉ１を電空変換器１６に送信するので、該電空変換器１６が制御エアａの圧力を一定時間だけ高めて前記調圧弁７を動作させ、これにより、調圧弁７の出口圧（燃料供給圧Ｐｆ）が下げられるようになっている。また、前記遮断負荷判断部１７から制御電圧ｉ３を受けて電磁弁１１が一定時間だけ開弁すると、配管１２を通って供給されるエアＡによって前記開閉弁９が開弁して、前記燃料ガス主管６内の燃料ガスが燃料ガス放出管１０を通って一定時間だけ放出されることにより、燃料ガス主管６内の燃料供給圧Ｐｆが急激に下げられるようになっている。
なお、前記調圧弁７，前記開閉弁９、前記電磁弁１１、前記燃料供給圧検出器１４、前記遮断器等も前記燃料供給制御装置１の構成要素となっている。 When the operation signal i2 is input from the shutoff load determination unit 17, the pressure regulating valve control unit 15 changes the gain setting element of the internal PID computing unit by a predetermined time (holding time) set by a timer. Since the gain in the feedback control (feedback loop) is increased and the control current i1 is transmitted to the electropneumatic converter 16, the electropneumatic converter 16 increases the pressure of the control air a for a certain time to operate the pressure regulating valve 7. Thereby, the outlet pressure (fuel supply pressure Pf) of the pressure regulating valve 7 is lowered. Further, when the solenoid valve 11 is opened for a predetermined time in response to the control voltage i3 from the shutoff load determination unit 17, the on-off valve 9 is opened by the air A supplied through the pipe 12, and the fuel gas When the fuel gas in the main pipe 6 is discharged through the fuel gas discharge pipe 10 for a predetermined time, the fuel supply pressure Pf in the fuel gas main pipe 6 is rapidly lowered.
The pressure regulating valve 7, the on-off valve 9, the electromagnetic valve 11, the fuel supply pressure detector 14, the circuit breaker, and the like are also constituent elements of the fuel supply control device 1.

次に、前記構成のガスエンジンにおける燃料供給制御装置１の作用について図２，図３をも参照しながら説明する。
前記燃料供給制御装置１が動作状態とされてガスエンジンＥが運転されると、前記燃料ガス放出管１０の開閉弁９が閉じた状態において、燃料供給源からの燃料ガスが前記燃料管８を経て前記調圧弁７で圧力を調整された後、前記燃料ガス主管６を通って燃料供給電磁弁４で流量を調整されてから、前記燃料ガス枝管５によってエンジンの吸気ポートに導入される。そして、吸気ポートに導入された燃料ガスは、前記過給機から給気室を通して吸気ポートに導入された圧縮空気と混合され、この混合気がシリンダの主燃焼室内に導入されて燃焼されることによりガスエンジンから回転出力が得られ、この回転出力により発電装置Ｇが駆動されて発電される。 Next, the operation of the fuel supply control device 1 in the gas engine having the above configuration will be described with reference to FIGS.
When the fuel supply control device 1 is in an operating state and the gas engine E is operated, fuel gas from a fuel supply source passes through the fuel pipe 8 in a state where the on-off valve 9 of the fuel gas discharge pipe 10 is closed. After the pressure is adjusted by the pressure regulating valve 7, the flow rate is adjusted by the fuel supply electromagnetic valve 4 through the fuel gas main pipe 6, and then introduced into the intake port of the engine by the fuel gas branch pipe 5. The fuel gas introduced into the intake port is mixed with the compressed air introduced into the intake port from the supercharger through the air supply chamber, and this mixture is introduced into the main combustion chamber of the cylinder and burned. Thus, a rotational output is obtained from the gas engine, and the power generation device G is driven by this rotational output to generate electric power.

そして、前記ガスエンジンＥの運転中は、前記給気圧検出器１３によって検出された給気室内の給気圧Ｐａと、前記燃料供給圧検出器１４によって検出された燃料ガス主管６内の燃料供給圧Ｐｆとが前記調圧弁制御部１５に入力されているので、該調圧弁制御部１５は、それらの給気圧Ｐａと燃料供給圧Ｐｆとの差圧が、発電装置Ｇの発電電力（ガスエンジンＥの負荷）ｈ毎に設定された目標値になるようにＰＩＤ計算を行い、このＰＩＤ計算によって得られた制御信号ｉ１を電空変換器１６に出力する。そのため、該電空変換器１６が前記制御信号ｉ１にもとづいて制御エアａによって前記調圧弁７の調圧動作を行わせ、これにより、前記燃料ガス主管６内の燃料供給圧Ｐｆが、フィードバック制御により前記給気圧Ｐａとの間に適切な差圧が生じた状態に調節される。
したがって、前記燃料ガス枝管５の燃料供給電磁弁４がガスエンジンＥの調速動作によって的確に開弁されて、前記燃料ガス主管６から所定圧、所定流量の燃料ガスが燃料ガス枝管５を通して吸気ポートに供給され、そこで給気と混合されてシリンダ内に導入されて燃焼され、ガスエンジンＥは安定した運転状態を継続する。 During operation of the gas engine E, the supply air pressure Pa detected in the supply air chamber 13 by the supply air pressure detector 13 and the fuel supply pressure in the fuel gas main pipe 6 detected by the fuel supply pressure detector 14. Since Pf is input to the pressure regulating valve control unit 15, the pressure regulating valve control unit 15 determines that the differential pressure between the supply air pressure Pa and the fuel supply pressure Pf is generated power of the power generator G (gas engine E PID calculation is performed so that the target value is set for each h), and the control signal i1 obtained by this PID calculation is output to the electropneumatic converter 16. Therefore, the electropneumatic converter 16 controls the pressure regulating valve 7 by the control air a based on the control signal i1, and thereby the fuel supply pressure Pf in the fuel gas main pipe 6 is feedback controlled. Thus, the pressure is adjusted to a state where an appropriate differential pressure is generated between the supply pressure Pa and the supply pressure Pa.
Accordingly, the fuel supply solenoid valve 4 of the fuel gas branch pipe 5 is accurately opened by the speed-regulating operation of the gas engine E, and the fuel gas having a predetermined pressure and a predetermined flow rate is supplied from the fuel gas main pipe 6 to the fuel gas branch pipe 5. Is supplied to the intake port, where it is mixed with the supply air, introduced into the cylinder and burned, and the gas engine E continues to operate stably.

しかし、前記ガスエンジンＥの運転中に、停電等が発生することにより、前記発電装置Ｇの給電系統に設置されている遮断器が開いて、ガスエンジンＥの負荷が定格負荷から瞬時に無負荷あるいは部分負荷に変化した場合（負荷遮断時）は、図２（ａ）に示すように、前記遮断器が開いて負荷遮断信号ｂ１が前記遮断負荷判断部１７に入力される（ステップＳ１）ので、該遮断負荷判断部１７は、前記負荷検出部１８から入力されている発電装置Ｇの発電電力ｈにもとづいて、負荷遮断寸前の電力量ｈｘと負荷遮断直後の電力量ｈｏの差から負荷遮断量ｈ１（図３（ａ）参照）を求め、該負荷遮断量ｈ１が予め設定されている設定負荷遮断量ｈｓと比較されて（ステップＳ２）、負荷遮断量ｈ１が設定負荷遮断量ｈｓ以上であるときは、前記調圧弁制御部１５に動作信号ｉ２を送信する。   However, when a power failure or the like occurs during operation of the gas engine E, the circuit breaker installed in the power supply system of the power generator G opens, and the load of the gas engine E is instantaneously no load from the rated load. Or when it changes to partial load (at the time of load interruption), as shown in Drawing 2 (a), since the above-mentioned circuit breaker opens, load interruption signal b1 is inputted into the above-mentioned interruption load judgment part 17 (Step S1). Based on the generated power h of the power generator G input from the load detector 18, the interrupted load determination unit 17 determines whether or not the load is interrupted from the difference between the amount of power hx just before the load is interrupted and the amount of power ho immediately after the load is interrupted. An amount h1 (see FIG. 3A) is obtained, and the load cutoff amount h1 is compared with a preset load cutoff amount hs (step S2), and the load cutoff amount h1 is equal to or greater than the set load cutoff amount hs. When there is It transmits an operation signal i2 to the valve control unit 15.

そして、前記動作信号ｉ２の入力により前記調圧弁制御部１５が動作して、その内部のＰＩＤ演算器のゲイン設定要素を低ゲイン値Ｋｏから予め定められた高ゲイン値Ｋ１に設定変更して（ステップＳ３ａ）、図３（ｂ）に示すように、その高ゲイン値Ｋ１をタイマで設定された一定時間（保持時間）Ｔ１だけ維持した（ステップＳ４ａ）後に、低ゲイン値Ｋｏに戻す（ステップＳ５ａ）。これにより、前記燃料ガス主管６内の燃料供給圧Ｐｆのフィードバック制御用のゲインが高められた制御電流ｉ１にもとづいて、前記電空変換器１６が前記調圧弁７をその出口圧が瞬時に低下して一定時間Ｔ１だけ維持するように動作させるので、前記燃料ガス主管６内の燃料供給圧Ｐｆが速やかに低下される。   Then, the pressure regulating valve control unit 15 operates in response to the input of the operation signal i2, and the gain setting element of the PID calculator inside is changed from a low gain value Ko to a predetermined high gain value K1 ( Step S3a), as shown in FIG. 3B, the high gain value K1 is maintained for a certain time (holding time) T1 set by the timer (Step S4a), and then returned to the low gain value Ko (Step S5a). ). As a result, the electropneumatic converter 16 instantaneously decreases the outlet pressure of the pressure regulating valve 7 based on the control current i1 in which the gain for feedback control of the fuel supply pressure Pf in the fuel gas main pipe 6 is increased. Thus, the fuel supply pressure Pf in the fuel gas main pipe 6 is quickly reduced because the operation is performed so as to maintain only for a predetermined time T1.

一方、図２（ｂ）に示すように、前記遮断器が開いて前記負荷遮断信号ｂ１が前記遮断負荷判断部１７に入力されたとき（ステップＳ１）は、該遮断負荷判断部１７が、前記のように負荷遮断量ｈ１（図３（ａ）参照）を求め、該負荷遮断量ｈ１が予め設定されている設定負荷遮断量ｈｓと比較され（ステップＳ２）、負荷遮断量ｈ１が設定負荷遮断量ｈｓ以上であると、前記遮断負荷判断部１７が動作指令（制御電圧）ｉ３によって前記電磁弁１１を開弁させ（ステップＳ３ｂ）、図３（ｃ）に示すように、その開弁状態をタイマで設定された所定時間（保持時間）Ｔ２だけ維持した（ステップＳ４ｂ）後に、前記電磁弁１１を閉じる（ステップＳ５ａ）。これにより、前記配管１２を通して流れる作動エアＡにより開閉弁９が所定時間Ｔ２だけ開弁されることにより、前記燃料ガス主管６の燃料ガスが瞬時に燃料ガス放出管１０を通して外部（燃料回収タンク等）に放出され、その放出が所定時間Ｔ２だけ維持され、燃料ガス主管６内の燃料供給圧Ｐｆが速やかに低下される。   On the other hand, as shown in FIG. 2B, when the breaker is opened and the load breaking signal b1 is input to the breaking load determining unit 17 (step S1), the breaking load determining unit 17 Thus, the load cutoff amount h1 (see FIG. 3A) is obtained, and the load cutoff amount h1 is compared with a preset load cutoff amount hs (step S2), and the load cutoff amount h1 is set to the set load cutoff amount. If the amount is greater than or equal to the amount hs, the shut-off load determination unit 17 opens the solenoid valve 11 by an operation command (control voltage) i3 (step S3b), and the valve open state is changed as shown in FIG. After maintaining for a predetermined time (holding time) T2 set by the timer (step S4b), the solenoid valve 11 is closed (step S5a). As a result, the on-off valve 9 is opened for a predetermined time T2 by the working air A flowing through the pipe 12, so that the fuel gas in the fuel gas main pipe 6 instantaneously passes through the fuel gas discharge pipe 10 to the outside (a fuel recovery tank or the like). And the release is maintained for a predetermined time T2, and the fuel supply pressure Pf in the fuel gas main pipe 6 is quickly reduced.

前記のようにして、ガスエンジンＥに対する負荷遮断時に、該負荷遮断時における負荷遮断量ｈ１が設定負荷遮断量ｈｓ以上であるか否かを、前記遮断負荷判断部１７によって判断され、前記負荷遮断量ｈ１が設定負荷遮断量ｈｓ以上である場合に、前記調圧弁制御部１５によって燃料ガス主管６内の燃料供給圧Ｐｆのフィードバック制御用のゲインが一定時間Ｔ１だけ高められて前記調圧弁７がその出口圧を一定時間低下させるように動作し、これと同時に、前記遮断負荷判断部１７によって電磁弁１１を介して前記開閉弁９が所定時間Ｔ２だけ開弁されて、前記燃料ガス主管６内の燃料ガスが燃料ガス放出管１０を通って所定時間放出されるようになっているので、前記負荷遮断時における燃料ガス主管６内の燃料供給圧Ｐｆを、前記調圧弁制御部１５と遮断負荷判断部１７によって前記調圧弁７と開閉弁９の動作を的確に制御することによって、迅速、効果的に低下させることができる。これにより、負荷遮断時に、前記燃料ガス主管６から燃料ガス枝管５を通してシリンダへ供給される燃料ガスの燃料供給圧Ｐｆと、過給機からシリンダへ供給される圧縮空気の給気圧Ｐａとの差圧が異常に増加することが防止される。
したがって、ガスエンジンＥの負荷遮断時に、燃料供給圧Ｐｆと給気圧Ｐａの差圧が大きくなることにより、前記燃料ガス枝管５の燃料供給電磁弁４が開弁しなくなって、ガスエンジンＥが失速してしまうといった現象がおこることはなく、ガスエンジンＥの安定した燃焼運転が確保される。 As described above, when the load on the gas engine E is interrupted, the interrupt load determining unit 17 determines whether or not the load interrupt amount h1 at the time of the load interrupt is equal to or greater than the set load interrupt amount hs. When the amount h1 is equal to or greater than the set load cutoff amount hs, the pressure regulating valve control unit 15 increases the gain for feedback control of the fuel supply pressure Pf in the fuel gas main pipe 6 by a predetermined time T1, and the pressure regulating valve 7 At the same time, the shutoff load determination unit 17 opens the on-off valve 9 through the electromagnetic valve 11 for a predetermined time T2, and the inside of the fuel gas main pipe 6 is operated. The fuel gas is discharged through the fuel gas discharge pipe 10 for a predetermined time, so that the fuel supply pressure Pf in the fuel gas main pipe 6 at the time of the load interruption is adjusted. By accurately controlling the operation of the on-off valve 9 and the pressure regulating valve 7 by the valve control section 15 and the cut-off load determination unit 17, it is possible to quickly, thereby effectively lowering. Thus, when the load is interrupted, the fuel supply pressure Pf of the fuel gas supplied from the fuel gas main pipe 6 to the cylinder through the fuel gas branch pipe 5 and the supply pressure Pa of the compressed air supplied from the supercharger to the cylinder Abnormal increase in differential pressure is prevented.
Therefore, when the load of the gas engine E is cut off, the differential pressure between the fuel supply pressure Pf and the supply air pressure Pa increases, so that the fuel supply electromagnetic valve 4 of the fuel gas branch pipe 5 does not open, and the gas engine E A phenomenon of stalling does not occur, and a stable combustion operation of the gas engine E is ensured.

以上説明したように、前記実施の形態に係るガスエンジンにおける燃料供給制御装置１は、過給機からシリンダに導入される圧縮空気の給気圧Ｐａを検出すると共に、燃料ガス供給源から燃料供給電磁弁４によって流路を開閉制御される燃料ガス枝管５を通してシリンダ内に供給される燃料ガスの燃料供給圧Ｐｆを検出し、前記給気圧Ｐａと燃料供給圧Ｐｆとの差圧がガスエンジンＥの負荷ｈに応じて調整されるように、制御手段によって前記燃料ガス主管６の入口に設けた調圧弁７を動作させてフィードバック制御により、前記燃料ガス主管６に導入される燃料ガスの圧力を制御するようにしたガスエンジンにおける燃料供給制御装置において、前記制御手段が、ガスエンジンＥの負荷量を検出する負荷検出部１８と、ガスエンジンＥの負荷遮断の有無を遮断器からの負荷遮断信号ｂにより判定すると共に、前記負荷検出部１８から入力される負荷量にもとづいてガスエンジンＥの負荷遮断時における負荷遮断量ｈ１を求め、該負荷遮断量ｈ１が設定負荷遮断量（設定値）ｈｓ以上か否かを判断し、設定負荷遮断量ｈｓ以上の時に動作指令ｉ２，ｉ３を出力する遮断負荷判断部１７と、該遮断負荷判断部１７から出力された動作指令ｉ２によって動作し、前記フィードバック制御におけるゲインを一定時間だけ高めて前記調圧弁７を電空変換器１６を介して動作させる調圧弁制御部１５とを備え、また、前記燃料ガス主管６に開閉弁９を設けた燃料ガス放出管１０が接続されており、前記遮断負荷判断部１７から出力された動作指令ｉ３で電磁弁１１を介して開閉される配管１２を通して供給される動作エアＡにより前記開閉弁９が所定時間だけ開弁されて、前記燃料ガス主管６から燃料ガスが燃料ガス放出管１０を通して放出される構成とされている。   As described above, the fuel supply control device 1 in the gas engine according to the embodiment detects the supply pressure Pa of compressed air introduced from the supercharger into the cylinder, and also supplies the fuel supply electromagnetic from the fuel gas supply source. The fuel supply pressure Pf of the fuel gas supplied into the cylinder through the fuel gas branch pipe 5 whose opening and closing is controlled by the valve 4 is detected, and the differential pressure between the supply air pressure Pa and the fuel supply pressure Pf is the gas engine E. The pressure control valve 7 provided at the inlet of the fuel gas main pipe 6 is operated by the control means so that the pressure of the fuel gas introduced into the fuel gas main pipe 6 is controlled by feedback control. In the fuel supply control device for a gas engine to be controlled, the control means includes a load detection unit 18 for detecting a load amount of the gas engine E, and a negative value for the gas engine E. The presence or absence of interruption is determined by the load interruption signal b from the circuit breaker, and the load interruption amount h1 at the time of load interruption of the gas engine E is obtained based on the load amount input from the load detector 18, and the load interruption amount It is determined whether or not h1 is greater than or equal to a set load cutoff amount (set value) hs, and when it is equal to or greater than the set load cutoff amount hs, an interrupt load determination unit 17 that outputs operation commands i2 and i3, and an output from the interrupt load determination unit 17 And a pressure regulating valve controller 15 that operates the pressure regulating valve 7 via the electropneumatic converter 16 by increasing the gain in the feedback control for a certain period of time, and operating the fuel gas main pipe. 6 is connected to a fuel gas discharge pipe 10 provided with an open / close valve 9, and is a pipe 12 that is opened and closed via an electromagnetic valve 11 in response to an operation command i 3 output from the shut-off load determination section 17 The on-off valve 9 by operating the air A supplied through is opened for a predetermined time, the fuel gas from the fuel gas main pipe 6 is configured to be discharged through the fuel gas discharge pipe 10.

したがって、前記実施の形態に係るガスエンジンにおける燃料供給制御装置１によれば、負荷遮断時に、その遮断負荷量ｈ１が設定遮断負荷量ｈｓ以上になった場合、調圧弁制御部１５によって燃料ガス主管６内の燃料供給圧のフィードバック制御におけるゲインが一定時間だけ高められることにより、前記調圧弁７が敏感に動作して前記燃料ガス主管６内の燃料ガスの圧力を瞬時に下げることに加えて、遮断負荷判断部１７によって所定時間だけ前記開閉弁９を開弁させることにより、燃料ガス主管６内の燃料ガスを前記燃料ガス放出管１０から速やかに外部へ放出させ、燃料ガス主管６内の燃料ガスの圧力を効果的に下げることができるので、燃料ガス主管６から吸気ポートを経て燃料ガスを供給する燃料ガス枝管５に設けた燃料供給電磁弁４の入口と出口の差圧を適切かつ確実に維持することができ、これにより、前記燃料供給電磁弁４の開閉動作を円滑、確実に行わせて、燃料ガスのシリンダ内への供給を確保することができ、負荷遮断時においても、ガスエンジンＥが失速することなく運転を継続することができる。   Therefore, according to the fuel supply control device 1 in the gas engine according to the above-described embodiment, when the shut-off load amount h1 becomes equal to or greater than the set shut-off load amount hs when the load is shut off, the pressure regulating valve control unit 15 performs the fuel gas main pipe. In addition to the fact that the pressure in the feedback control of the fuel supply pressure in 6 is increased for a certain period of time, the pressure regulating valve 7 operates sensitively to instantaneously lower the pressure of the fuel gas in the fuel gas main pipe 6, By opening the on-off valve 9 for a predetermined time by the shut-off load determining unit 17, the fuel gas in the fuel gas main pipe 6 is quickly released to the outside from the fuel gas discharge pipe 10, and the fuel in the fuel gas main pipe 6 is discharged. Since the gas pressure can be effectively reduced, the fuel supply power provided in the fuel gas branch pipe 5 for supplying the fuel gas from the fuel gas main pipe 6 through the intake port is provided. The pressure difference between the inlet and the outlet of the valve 4 can be maintained appropriately and reliably, whereby the fuel supply electromagnetic valve 4 can be smoothly opened and closed to supply fuel gas into the cylinder. Thus, even when the load is interrupted, the operation can be continued without causing the gas engine E to stall.

なお、前記実施の形態に係るガスエンジンにおける燃料供給制御装置１においては、負荷遮断時に、前記調圧弁制御部１５によって前記燃料ガス主管６内の燃料供給圧Ｐｆのフィードバック制御用のゲインを、一定時間高めて前記調圧弁７を制御することにより、燃料ガス主管６内の燃料供給圧Ｐｆを下げると同時に、前記遮断負荷判断部１７によって前記燃料ガス放出管１０の開閉弁９を開いて前記燃料ガス主管６内の燃料ガスを所定時間放出して、燃料ガス主管６内の燃料供給圧Ｐｆを速やかに下げることにより、燃料供給電磁弁４の入口と出口の差圧を適正値に維持させ、負荷遮断時でも前記燃料供給電磁弁４が確実に動作して、ガスエンジンＥのシリンダへの燃料ガスの供給を安定して行えるように構成して、負荷遮断時におけるガスエンジンＥの失速運転の防止効果を高めている。   In the fuel supply control apparatus 1 in the gas engine according to the above embodiment, the gain for feedback control of the fuel supply pressure Pf in the fuel gas main pipe 6 is kept constant by the pressure regulating valve control unit 15 when the load is shut off. By controlling the pressure regulating valve 7 by increasing the time, the fuel supply pressure Pf in the fuel gas main pipe 6 is lowered, and at the same time, the shutoff load determination unit 17 opens the on-off valve 9 of the fuel gas discharge pipe 10 to open the fuel. By releasing the fuel gas in the gas main pipe 6 for a predetermined time and quickly reducing the fuel supply pressure Pf in the fuel gas main pipe 6, the pressure difference between the inlet and outlet of the fuel supply electromagnetic valve 4 is maintained at an appropriate value, The fuel supply solenoid valve 4 operates reliably even when the load is shut off, so that the fuel gas can be stably supplied to the cylinder of the gas engine E. To enhance the effect of preventing stalling operation of the engine E.

しかし、本発明はこれに限らず、前記調圧弁制御部１５によって前記燃料ガス主管６内の燃料供給圧Ｐｆのフィードバック制御用のゲインを高めること、または前記遮断負荷判断部１７によって前記燃料ガス主管６内の燃料ガスを放出すること、のいずれか一方を実施して燃料ガス主管６内の燃料供給圧Ｐｆを下げるように構成してもよく、いずれの構成においても、前記燃料ガス枝管５の燃料供給電磁弁４の入口と出口の差圧を適切に維持して前記燃料供給電磁弁４の開閉動作を確実に行わせることができ、負荷遮断時においてガスエンジンＥが失速することなく運転を継続することができる。その場合は、何れか一方に対応する装置を具備してその一方のみを単独に実施してもよく、また、両方に対応した装置を具備して、外部からいずれか一方を選択して実施できるようにしてもよい。   However, the present invention is not limited to this. The gain for feedback control of the fuel supply pressure Pf in the fuel gas main pipe 6 is increased by the pressure regulating valve control unit 15, or the fuel gas main pipe is used by the shut-off load determination unit 17. The fuel gas branch pipe 5 may be configured so as to lower the fuel supply pressure Pf in the fuel gas main pipe 6 by either one of releasing the fuel gas in the fuel pipe 6. The fuel supply electromagnetic valve 4 can be opened and closed reliably by properly maintaining the differential pressure between the inlet and outlet of the fuel supply electromagnetic valve 4 and the gas engine E can be operated without stalling when the load is shut off. Can continue. In such a case, a device corresponding to one of them may be provided and only one of them may be implemented alone, or a device corresponding to both may be provided and either one may be selected from the outside. You may do it.

また、前記実施の形態に係るガスエンジンにおける燃料供給制御装置１においては、前記燃料ガス主管６の調圧弁７の動作を調圧弁制御部１５によって電空変換器１６を介して間接的に制御するようにしたが、電空変換器１６を介さずに直接制御するようにしてもよく、また、前記燃料ガス放出管の開閉弁９を前記遮断負荷判断部１７からの動作指令ｉ３で電磁弁１１を介して開閉される配管１２から供給される動作エアＡにより間接的に開閉させるようにしたが、これに限らず、前記開閉弁９を電磁弁等に代えて前記遮断負荷判断部１７からの動作指令ｉ３で直接的に開閉させるようにしてもよい。   Further, in the fuel supply control device 1 in the gas engine according to the embodiment, the operation of the pressure regulating valve 7 of the fuel gas main pipe 6 is indirectly controlled by the pressure regulating valve control unit 15 via the electropneumatic converter 16. However, the control may be performed directly without using the electropneumatic converter 16, and the on / off valve 9 of the fuel gas discharge pipe is controlled by the operation command i 3 from the shutoff load determination unit 17. However, the present invention is not limited to this, and the opening / closing valve 9 is replaced by an electromagnetic valve or the like from the shut-off load determination unit 17. You may make it open and close directly with the operation command i3.

本発明の一実施の形態に係るガスエンジンにおける燃料供給制御装置を示す系統図である。1 is a system diagram showing a fuel supply control device in a gas engine according to an embodiment of the present invention. 同じく燃料供給制御装置の作用を示すフロー図である。It is a flowchart which similarly shows the effect | action of a fuel supply control apparatus. 同じく燃料供給制御装置の作用を示すタイミングチャートである。It is a timing chart which similarly shows the effect | action of a fuel supply control apparatus.

符号の説明Explanation of symbols

１ 燃料供給制御装置
２ エンジン本体
３ シリンダヘッド
４ 燃料供給電磁弁（燃料供給弁）
５ 燃料ガス枝管（燃料供給管）
６ 燃料ガス主管（燃料供給管）
７ 調圧弁
８ 燃料管（燃料供給管）
９ 開閉弁
１０ 燃料ガス放出管
１１ 電磁弁
１２ 配管
１３ 給気圧検出器
１４ 燃料供給圧検出器
１５ 調圧弁制御部（制御手段）
１６ 電空変換器 （制御手段）
１７ 遮断負荷判断部（制御手段）
１８ 電力負荷検出部（制御手段）
Ｅ ガスエンジン
Ｇ 発電装置 DESCRIPTION OF SYMBOLS 1 Fuel supply control apparatus 2 Engine main body 3 Cylinder head 4 Fuel supply solenoid valve (fuel supply valve)
5 Fuel gas branch pipe (fuel supply pipe)
6 Fuel gas main pipe (fuel supply pipe)
7 Pressure regulating valve 8 Fuel pipe (fuel supply pipe)
DESCRIPTION OF SYMBOLS 9 On-off valve 10 Fuel gas discharge pipe 11 Solenoid valve 12 Piping 13 Supply pressure detector 14 Fuel supply pressure detector 15 Pressure regulation valve control part (control means)
16 Electro-pneumatic converter (control means)
17 Interrupting load determination unit (control means)
18 Power load detector (control means)
E Gas engine G Power generator

Claims (3)

過給機からシリンダに導入される圧縮空気の給気圧を検出すると共に、燃料ガス供給源から燃料供給弁によって流路を開閉制御される燃料供給管を通してシリンダ内に供給される燃料ガスの燃料供給圧を検出し、前記給気圧と燃料供給圧との差圧がガスエンジンの負荷に応じて調整されるように、制御手段によって前記燃料供給管の入口に設けた調圧弁を動作させてフィードバック制御により、前記燃料供給管に導入される燃料ガスの圧力を制御するようにしたガスエンジンにおける燃料供給制御装置において、
前記制御手段は、ガスエンジンの負荷量を検出する負荷検出部と、ガスエンジンの負荷遮断の有無を判定すると共に、該負荷検出部から入力される負荷量にもとづいてガスエンジンの負荷遮断時における負荷遮断量を求め、該負荷遮断量が設定値以上か否かを判断し、設定値以上の時に動作指令を出力する遮断負荷判断部と、該遮断負荷判断部から出力された動作指令によって動作し、前記フィードバック制御におけるゲインを一定時間だけ高めて前記調圧弁を動作させる調圧弁制御部とを備えていることを特徴とするガスエンジンにおける燃料供給制御装置。 Fuel supply of fuel gas supplied into the cylinder through a fuel supply pipe whose opening and closing is controlled by a fuel supply valve from a fuel gas supply source while detecting the supply pressure of compressed air introduced from the supercharger into the cylinder The pressure is detected, and the pressure control valve provided at the inlet of the fuel supply pipe is operated by the control means so that the differential pressure between the supply air pressure and the fuel supply pressure is adjusted according to the load of the gas engine. In the fuel supply control device in the gas engine, which controls the pressure of the fuel gas introduced into the fuel supply pipe,
The control means determines a load detection unit for detecting a load amount of the gas engine and whether or not the gas engine load is interrupted, and at the time of gas engine load interruption based on the load amount input from the load detection unit. Calculates the load cutoff amount, determines whether the load cutoff amount is greater than or equal to the set value, and outputs an operation command when the load cutoff amount is equal to or greater than the set value, and operates according to the operation command output from the interrupt load determination unit And a pressure regulating valve control unit that operates the pressure regulating valve by increasing a gain in the feedback control for a certain period of time. 前記燃料供給管には開閉弁を設けた燃料ガス放出管が接続されており、前記遮断負荷判断部から出力された動作指令によって前記開閉弁が所定時間だけ開弁されて、前記燃料供給管から燃料ガスが放出されるようになっていることを特徴とする請求項１に記載のガスエンジンにおける燃料供給制御装置。   A fuel gas discharge pipe provided with an open / close valve is connected to the fuel supply pipe, and the open / close valve is opened for a predetermined time by an operation command output from the shut-off load determination unit, and the fuel supply pipe is 2. A fuel supply control apparatus for a gas engine according to claim 1, wherein fuel gas is discharged. 過給機からシリンダに導入される圧縮空気の給気圧を検出すると共に、燃料ガス供給源から燃料供給弁によって流路を開閉制御される燃料供給管を通してシリンダ内に供給される燃料ガスの燃料供給圧を検出し、前記給気圧と燃料供給圧との差圧がガスエンジンの負荷に応じて調整されるように、制御手段によって前記燃料供給管の入口に設けた調圧弁を動作させてフィードバック制御により、前記燃料供給管に導入される燃料ガスの圧力を制御するようにしたガスエンジンにおける燃料供給制御装置において、
前記燃料供給管には開閉弁を設けた燃料ガス放出管が接続されており、前記制御手段は、ガスエンジンの負荷量を検出する負荷検出部と、ガスエンジンの負荷遮断の有無を判定すると共に、該負荷検出部から入力される負荷量にもとづいてガスエンジンの負荷遮断時における負荷遮断量を求め、該負荷遮断量が設定値以上か否かを判断し、設定値以上の時に動作指令を出力する遮断負荷判断部とを備えており、該遮断負荷判断部から出力された動作指令によって前記開閉弁が所定時間だけ開弁されて、前記燃料供給管から燃料ガスが放出されるようになっていることを特徴とするガスエンジンにおける燃料供給制御装置。 Fuel supply of fuel gas supplied into the cylinder through a fuel supply pipe whose opening and closing is controlled by a fuel supply valve from a fuel gas supply source while detecting the supply pressure of compressed air introduced from the supercharger into the cylinder The pressure is detected, and the pressure control valve provided at the inlet of the fuel supply pipe is operated by the control means so that the differential pressure between the supply air pressure and the fuel supply pressure is adjusted according to the load of the gas engine. In the fuel supply control device in the gas engine, which controls the pressure of the fuel gas introduced into the fuel supply pipe,
A fuel gas discharge pipe provided with an open / close valve is connected to the fuel supply pipe, and the control means determines a load detection unit for detecting a load amount of the gas engine and whether or not the load cut off of the gas engine is interrupted. Based on the load amount input from the load detection unit, the load cutoff amount at the time of gas engine load cutoff is obtained, and it is determined whether or not the load cutoff amount is equal to or greater than a set value. A shut-off load determination unit for outputting, and the on-off valve is opened for a predetermined time by an operation command output from the shut-off load determination unit, so that fuel gas is discharged from the fuel supply pipe. A fuel supply control device for a gas engine.
JP2006298848A 2006-11-02 2006-11-02 Fuel supply control device for gas engine Expired - Fee Related JP5094092B2 (en)

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Cited By (5)

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JP2015227653A (en) * 2014-06-03 2015-12-17 ヤンマー株式会社 Biomass gas mono-fuel combustion engine
JP2016164413A (en) * 2015-03-06 2016-09-08 マン・ディーゼル・アンド・ターボ・エスイー Method and closed loop control system for operating engine
CN112196679A (en) * 2020-09-29 2021-01-08 广西玉柴机器股份有限公司 Transient compensation control system and method for gas generator
CN116335859A (en) * 2023-05-23 2023-06-27 潍柴动力股份有限公司 Engine fuel supply system and control method
CN116447518A (en) * 2023-04-03 2023-07-18 广东港能新能源科技有限公司 Natural gas conveying pipeline pressure regulating device

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Publication number Priority date Publication date Assignee Title
JP2015227653A (en) * 2014-06-03 2015-12-17 ヤンマー株式会社 Biomass gas mono-fuel combustion engine
JP2016164413A (en) * 2015-03-06 2016-09-08 マン・ディーゼル・アンド・ターボ・エスイー Method and closed loop control system for operating engine
CN112196679A (en) * 2020-09-29 2021-01-08 广西玉柴机器股份有限公司 Transient compensation control system and method for gas generator
CN112196679B (en) * 2020-09-29 2024-02-09 广西玉柴船电动力有限公司 Transient compensation control system and method for gas generator
CN116447518A (en) * 2023-04-03 2023-07-18 广东港能新能源科技有限公司 Natural gas conveying pipeline pressure regulating device
CN116447518B (en) * 2023-04-03 2023-11-10 广东港能新能源科技有限公司 Natural gas conveying pipeline pressure regulating device
CN116335859A (en) * 2023-05-23 2023-06-27 潍柴动力股份有限公司 Engine fuel supply system and control method
CN116335859B (en) * 2023-05-23 2023-09-15 潍柴动力股份有限公司 Engine fuel supply system and control method

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