JPS62162760A - Miss-fire controller for gas engine - Google Patents

Miss-fire controller for gas engine

Info

Publication number
JPS62162760A
JPS62162760A JP317186A JP317186A JPS62162760A JP S62162760 A JPS62162760 A JP S62162760A JP 317186 A JP317186 A JP 317186A JP 317186 A JP317186 A JP 317186A JP S62162760 A JPS62162760 A JP S62162760A
Authority
JP
Japan
Prior art keywords
gas
cylinder
pressure
gas engine
engine
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.)
Granted
Application number
JP317186A
Other languages
Japanese (ja)
Other versions
JPH0643822B2 (en
Inventor
Shuji Sato
修二 佐藤
Yoshio Mishima
宣雄 三島
Haruo Maruyama
円山 晴男
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP61003171A priority Critical patent/JPH0643822B2/en
Publication of JPS62162760A publication Critical patent/JPS62162760A/en
Publication of JPH0643822B2 publication Critical patent/JPH0643822B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

PURPOSE:To improve the safety of the whole engine equipment by directly detecting the pressure inside the cylinder of a gas engine and judging the miss fire when the pressure lowers below a standard value and suspending the supply of fuel gas, thus preventing the discharge of uncombusted gas. CONSTITUTION:In a gas engine, gas 1 is mixed into the intake 5 through a cut-off valve 2, gas regulator 3, and a gas carburetor 4, and supplied into a cylinder 7. A pressure sensor 13 for directly detecting the pressure inside is installed into the cylinder 7, and the pressure in the cylinder and a standard value are always compared, and when the pressure in the cylinder lowers below the standard value, a controller 14 closes the cut-off valve 2, and stops the supply of gas.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ガスエンジン発電機等に用いられるガスエン
ジンの失火による未燃ガスの排出を防止するのに好適な
失火制御装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a misfire control device suitable for preventing discharge of unburned gas due to misfire of a gas engine used in a gas engine generator or the like.

〔従来の技術〕[Conventional technology]

ガスエンジンは可燃性ガスを燃料としそれをシリンダ内
部において圧縮し電気スパークにより点火燃焼させるも
のであるが、点火プラグまたは点火装置の不具合により
ガスが点火燃焼しない場合が考えられる。この場合、燃
焼しなかった未燃ガスは排気系に流出し、何らかの作用
により排気系統において着火し爆発して、設備を破損さ
せる危険性がある。このためガスエンジンにおいては点
火燃焼しなかった失火の状態を検出しエンジンを停止さ
せて設備の安全を図る必要がある。
A gas engine uses flammable gas as fuel, compresses it inside a cylinder, and ignites and burns it using an electric spark. However, there may be cases where the gas does not ignite and burn due to a malfunction in the spark plug or ignition device. In this case, the unburned gas that is not combusted flows out into the exhaust system, and there is a risk that it will ignite and explode in the exhaust system due to some action, causing damage to the equipment. For this reason, in a gas engine, it is necessary to detect a misfire state in which ignition and combustion did not occur and stop the engine to ensure the safety of the equipment.

従来では、シリンダ内の状態を直接検出する圧力センサ
を設けて点火時期等の制御を行うようにしたものが知ら
れている(特開昭59−103965号公報)。
Conventionally, there has been known a system in which a pressure sensor that directly detects the condition inside the cylinder is provided to control the ignition timing, etc. (Japanese Patent Application Laid-Open No. 103965/1982).

〔発明が解決すべき問題点〕[Problems to be solved by the invention]

しかし、上記従来の制御装置は、点火時期等の制御を精
密に行うためのもので、失火現象については考慮してい
ない、また、失火はガスエンジン発電機のように屋外に
設けられるケースの多いものの場合には設備の安全性を
離係する上で特に注意を必要とし、直ちに阻止する必要
がある。この点につき、適切な制御を行いうるものが要
望されていた。
However, the above-mentioned conventional control devices are designed to precisely control ignition timing, etc., and do not take misfire phenomena into consideration.Also, misfires are often installed outdoors, such as in gas engine generators. In such cases, special care must be taken to ensure the safety of the equipment and must be stopped immediately. In this regard, there has been a need for something that can perform appropriate control.

そこで、本発明は、シリンダ内部の圧力状態を直接検出
するとともに、その圧力状態に基づいて速やかに失火に
よる未燃ガスの排出を防止しうる失火制御装置を提供す
ることを目的とする。
SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a misfire control device that can directly detect the pressure state inside a cylinder and promptly prevent the discharge of unburned gas due to a misfire based on the pressure state.

〔問題点を解決するための手段〕[Means for solving problems]

上記した問題点を解決するために、本発明は、シリンダ
内部の圧力を直接検出する圧力センサを備えたガスエン
ジンにおいて、前記圧力センサの検出信号が予め定めら
れた基準値より低いとき前記シリンダへの燃料ガスの供
給停止信号を出力する制御装置を備えた点に特徴を有す
るものである。
In order to solve the above problems, the present invention provides a gas engine equipped with a pressure sensor that directly detects the pressure inside the cylinder, when the detection signal of the pressure sensor is lower than a predetermined reference value. The present invention is characterized in that it includes a control device that outputs a fuel gas supply stop signal.

〔作用〕[Effect]

上記した本発明の構成によれば、シリンダ内の圧力を直
接正確に検出する圧力センサからの検出信号の圧力値が
予め定められた基準値よりも低いときに燃料ガスの供給
を停止する。すなわち、通常運転時における燃焼時のシ
リンダ内圧力は、そのシリンダにもよるがほぼ一定の高
い値を示し。
According to the configuration of the present invention described above, the supply of fuel gas is stopped when the pressure value of the detection signal from the pressure sensor that directly and accurately detects the pressure inside the cylinder is lower than a predetermined reference value. That is, the pressure inside the cylinder during combustion during normal operation exhibits an almost constant high value, although it depends on the cylinder.

失火による未燃状態が発生した場合にはシリンダ内圧力
が低下する。この圧力低下をもって失火状態とみなし、
ただちに燃料ガスの供給を停止するものである。その結
果、エンジンの運転は停止され、安全性を損う未燃ガス
の排出を防止することができる。
When an unburned state occurs due to a misfire, the cylinder pressure decreases. This pressure drop is considered to be a misfire condition,
This immediately stops the supply of fuel gas. As a result, the operation of the engine is stopped, and the emission of unburned gas that impairs safety can be prevented.

〔実施例〕〔Example〕

次に、本発明の実施例を図面に基づいて説明する。 Next, embodiments of the present invention will be described based on the drawings.

第1図に、ガスエンジンの要部を示す。エンジンの運転
中においては、燃料ガス1が遮断弁2を介してガスレギ
ュレータ(、!11圧弁)3よリガスキャブレータ4に
供給される。ガスキャブレータ4では燃料ガス1と燃焼
空気とが適当な比率で混合される。その混合ガスは吸気
弁6を介してシリンダ7内へと送られる。送られた混合
ガスはシリンダ7内においてピストン8により圧縮され
、点火袋M9からの発生火花により爆発燃焼される。こ
のときの膨張力によってピストン8が押下げられ。
Figure 1 shows the main parts of a gas engine. During operation of the engine, fuel gas 1 is supplied to a regas carburetor 4 via a cutoff valve 2 and a gas regulator (!11 pressure valve) 3. In the gas carburetor 4, the fuel gas 1 and combustion air are mixed at an appropriate ratio. The mixed gas is sent into the cylinder 7 via the intake valve 6. The mixed gas sent is compressed by a piston 8 in the cylinder 7, and exploded and combusted by sparks generated from the ignition bag M9. The piston 8 is pushed down by the expansion force at this time.

その直線運動がクランク(図示せず)により回転力に変
換され、その回転出方により発電機(図示せず)が駆動
される。仕事をした排気ガス11は排気弁12により外
部へ排出される。
The linear motion is converted into rotational force by a crank (not shown), and a generator (not shown) is driven by the rotation output. The exhaust gas 11 that has done work is discharged to the outside by an exhaust valve 12.

さて、通常時におけるシリンダ7内の圧力状態は、第2
図に示すようにピストンの運動(爆発の周期)に同期し
て高くなる特性を示す、したがって、この値を圧力セン
サ13により検出し、平均化すれば、第3図の正常電圧
値(実線)15に示すごとくなる。圧力センサ13は第
1図に示すように検出部がシリンダ7の内部の圧力を直
接的に検出すべく取付けられている。圧力センサ13の
検出信号は制御袋Wt14に入力される。
Now, the pressure state inside the cylinder 7 under normal conditions is the second
As shown in the figure, it exhibits a characteristic that increases in synchronization with the movement of the piston (explosion cycle). Therefore, if this value is detected by the pressure sensor 13 and averaged, the normal voltage value (solid line) in Figure 3 15. As shown in FIG. 1, the pressure sensor 13 has a detecting section attached to directly detect the pressure inside the cylinder 7. The detection signal of the pressure sensor 13 is input to the control bag Wt14.

制御装置14は、第4図に示すように、例えば圧力セン
サ13からの検出信号を増幅するアンプ18と、整流回
路19と、比較演算器2oと、遮断弁2への駆動信号を
出力する駆動部21′とを備えている。すなわち、圧力
センサ13の検出信号は、アンプ18により増幅され、
次いで整流回路により平滑化されて直流電圧に変換され
る。この電圧は比較演算器20において予め定められた
基準電圧16(第3図)と比較される。正常電圧15の
場合は何ら信号は出されないが、低い電圧(失火電圧)
17の場合には停止信号が出力され、駆動部21を介し
て遮断弁2が閉じられることとなる。その結果、燃料の
供給が停止され、エンジンは直ちに停止する。なお、失
火電圧17が低いのは、失火による未燃状態が発生した
場合にはシリンダ7内の圧力が低下するからであるに他
ならない。
As shown in FIG. 4, the control device 14 includes, for example, an amplifier 18 that amplifies a detection signal from the pressure sensor 13, a rectifier circuit 19, a comparator 2o, and a drive circuit that outputs a drive signal to the cutoff valve 2. 21'. That is, the detection signal of the pressure sensor 13 is amplified by the amplifier 18,
The voltage is then smoothed by a rectifier circuit and converted into a DC voltage. This voltage is compared with a predetermined reference voltage 16 (FIG. 3) in a comparator 20. If the normal voltage is 15, no signal will be output, but if the voltage is low (misfire voltage)
In the case of 17, a stop signal is output, and the cutoff valve 2 is closed via the drive unit 21. As a result, the fuel supply is cut off and the engine immediately stops. Note that the reason why the misfire voltage 17 is low is simply because the pressure inside the cylinder 7 decreases when an unburned state occurs due to a misfire.

〔発明の効果〕〔Effect of the invention〕

以上述べたごとく1本発明によれば、ガスエンジンにお
ける点火装置や点火プラグなどの不具合による点火失敗
が即時に判明し、排気系がらの未燃ガスの排出を防止す
ることができ、よって設備全体の安全性と信頼性を向上
できる。
As described above, according to the present invention, ignition failure due to a malfunction in the ignition device or spark plug in a gas engine can be immediately detected, and the discharge of unburned gas from the exhaust system can be prevented, thereby preventing the entire equipment from being discharged. can improve safety and reliability.

【図面の簡単な説明】 第1図はガスエンジンの要部と本発明の実施例を示すブ
ロック図、第2図はシリンダ内の圧力状態を示す説明図
、第3図は圧力検出電圧と基準電圧との関係を示す説明
図、第4図は制御回路の例を示すブロック図である。 1・・・燃料ガス、2・・・燃料ガス遮断弁、3・・・
ガスレギュレータ、4・・・ガスキャブレータ、5・・
・燃焼空気、6・・・吸気弁、7・・・シリンダ、8・
・・ピストン、9・・・点火装置、10・・・点火プラ
グ、11・・・排気ガス、12・・・排気弁、13・・
・圧力センサ、14・・・交換器、15・・・正常電圧
、16・・・基準電圧、17・・・失火電圧。
[Brief Description of the Drawings] Figure 1 is a block diagram showing the main parts of a gas engine and an embodiment of the present invention, Figure 2 is an explanatory diagram showing the pressure state inside the cylinder, and Figure 3 is a pressure detection voltage and reference An explanatory diagram showing the relationship with voltage, and FIG. 4 is a block diagram showing an example of a control circuit. 1...Fuel gas, 2...Fuel gas cutoff valve, 3...
Gas regulator, 4... Gas carburetor, 5...
・Combustion air, 6... Intake valve, 7... Cylinder, 8.
... Piston, 9... Ignition device, 10... Spark plug, 11... Exhaust gas, 12... Exhaust valve, 13...
- Pressure sensor, 14... Exchanger, 15... Normal voltage, 16... Reference voltage, 17... Misfire voltage.

Claims (1)

【特許請求の範囲】[Claims] 1、シリンダ内部の圧力を直接検出する圧力センサを備
えたガスエンジンにおいて、前記圧力センサの検出信号
が予め定められた基準値より低いとき前記シリンダへの
燃料ガスの供給停止信号を出力する制御装置を備えたこ
とを特徴とするガスエンジンの失火制御装置。
1. In a gas engine equipped with a pressure sensor that directly detects the pressure inside the cylinder, a control device that outputs a signal to stop the supply of fuel gas to the cylinder when the detection signal of the pressure sensor is lower than a predetermined reference value. A gas engine misfire control device comprising:
JP61003171A 1986-01-10 1986-01-10 Gas engine misfire control device Expired - Lifetime JPH0643822B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61003171A JPH0643822B2 (en) 1986-01-10 1986-01-10 Gas engine misfire control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61003171A JPH0643822B2 (en) 1986-01-10 1986-01-10 Gas engine misfire control device

Publications (2)

Publication Number Publication Date
JPS62162760A true JPS62162760A (en) 1987-07-18
JPH0643822B2 JPH0643822B2 (en) 1994-06-08

Family

ID=11549932

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61003171A Expired - Lifetime JPH0643822B2 (en) 1986-01-10 1986-01-10 Gas engine misfire control device

Country Status (1)

Country Link
JP (1) JPH0643822B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6240910B1 (en) 1999-06-02 2001-06-05 Fujitsu Ten Limited Fuel injection control system for compressed natural gas-fueled automotive vehicle
JP2018084216A (en) * 2016-11-25 2018-05-31 新潟原動機株式会社 Gas fuel engine and method for stopping gas fuel engine
JP2019196763A (en) * 2018-05-11 2019-11-14 三菱重工エンジン&ターボチャージャ株式会社 Control device, power generation facility, control method, and program
JP2019196757A (en) * 2018-05-11 2019-11-14 三菱重工エンジン&ターボチャージャ株式会社 Control device, power generation facility, control method, and program

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6133932U (en) * 1984-07-31 1986-03-01 川崎重工業株式会社 Gas engine abnormality detection device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6133932U (en) * 1984-07-31 1986-03-01 川崎重工業株式会社 Gas engine abnormality detection device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6240910B1 (en) 1999-06-02 2001-06-05 Fujitsu Ten Limited Fuel injection control system for compressed natural gas-fueled automotive vehicle
JP2018084216A (en) * 2016-11-25 2018-05-31 新潟原動機株式会社 Gas fuel engine and method for stopping gas fuel engine
JP2019196763A (en) * 2018-05-11 2019-11-14 三菱重工エンジン&ターボチャージャ株式会社 Control device, power generation facility, control method, and program
JP2019196757A (en) * 2018-05-11 2019-11-14 三菱重工エンジン&ターボチャージャ株式会社 Control device, power generation facility, control method, and program

Also Published As

Publication number Publication date
JPH0643822B2 (en) 1994-06-08

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