JP2013238161A - Portable engine generator - Google Patents

Portable engine generator Download PDF

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JP2013238161A
JP2013238161A JP2012111359A JP2012111359A JP2013238161A JP 2013238161 A JP2013238161 A JP 2013238161A JP 2012111359 A JP2012111359 A JP 2012111359A JP 2012111359 A JP2012111359 A JP 2012111359A JP 2013238161 A JP2013238161 A JP 2013238161A
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fuel
engine
flow meter
generator
measured value
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Toshikazu Watanabe
俊和 渡辺
Taku Honma
拓 本間
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Nippon Sharyo Ltd
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Nippon Sharyo Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a portable engine generator capable of surely detecting the occurrence of fuel leakage and an occurrence part.SOLUTION: The inside of a casing having an oil retaining wall 26 is provided with an engine 11, a generator 12, a fuel tank 15, a fuel send-out pipe 22 and a fuel return pipe 23, a first flowmeter 31 and a second flowmeter 32 are arranged at both ends of the fuel send-out pipe and a third flowmeter 33 and a fourth flowmeter 34 are arranged at both ends of the fuel return pipe, respectively, a means 36 is arranged for determining the fuel consumption of the engine from a power generation state of the generator, a determining means 37 is arranged for detecting the fuel leakage of the fuel send-out pipe from measured values of the first flowmeter and the second flowmeter, the fuel leakage of the fuel return pipe from measured values of the third flowmeter and the fourth flowmeter and the fuel leakage of the engine from the measured value of the first flowmeter or the second flowmeter, the measured value of the third flowmeter or the fourth flowmeter and the fuel consumption, and warning generating means 39a and 39b are arranged for generating warnings when the fuel leakage is caused.

Description

本発明は、可搬式エンジン発電機に関し、詳しくは、下部に防油堤を備えたケーシングの内部にエンジン、発電機及び燃料タンクを収容した可搬式エンジン発電機に関する。   The present invention relates to a portable engine generator, and more particularly, to a portable engine generator in which an engine, a generator, and a fuel tank are housed in a casing having an oil bank at the bottom.

エンジンによって発電機を駆動する可搬式エンジン発電機では、エンジンなどから漏れた燃料が周囲に流出することを防止するための防油堤（オイルガード）を設けている（例えば、特許文献１参照。）。また、燃料タンクからエンジンに燃料を供給する燃料供給経路の途中に燃料小出し槽を設け、該燃料小出し槽内の燃料の状態から燃料漏れを検出するようにしたエンジン発電機が提案されている（例えば、特許文献２参照。）。   2. Description of the Related Art A portable engine generator that drives a generator by an engine is provided with an oil barrier to prevent fuel leaked from the engine or the like from flowing out to the surroundings (see, for example, Patent Document 1). ). Further, an engine generator has been proposed in which a fuel dispensing tank is provided in the middle of a fuel supply path for supplying fuel from the fuel tank to the engine, and fuel leakage is detected from the state of fuel in the fuel dispensing tank ( For example, see Patent Document 2.)

特開２００９−２９９６３３号公報JP 2009-299633 A 特開２００２−３１００２４号公報JP 2002-310024 A

特許文献２に記載された燃料漏れの検出方法では、主燃料槽（燃料タンク）とは別に燃料小出し槽を設けなければならず、構成が複雑でコスト増になるだけでなく、主燃料槽と燃料小出し槽との間からの燃料漏れは検出することができなかった。また、可搬式エンジン発電機では、長時間連続運転に対応するため、燃料タンクの大容量化が進んでおり、これに伴って防油堤の容積も大きくする必要があることから、防油堤を含めたエンジン発電機が大型化する傾向にある。   In the fuel leak detection method described in Patent Document 2, a fuel dispensing tank must be provided separately from the main fuel tank (fuel tank), which not only increases the cost and complexity of the configuration, No fuel leakage from the fuel dispensing tank could be detected. In addition, in portable engine generators, the capacity of fuel tanks is increasing in order to support continuous operation for a long period of time. There is a tendency for engine generators including

そこで本発明は、燃料漏れの発生及び発生部分を確実に検出することができ、防油堤を含めたエンジン発電機の小型化を図ることができる可搬式エンジン発電機を提供することを目的としている。   Accordingly, an object of the present invention is to provide a portable engine generator capable of reliably detecting the occurrence and occurrence of fuel leakage and reducing the size of the engine generator including the oil breakwater. Yes.

上記目的を達成するため、本発明の可搬式エンジン発電機は、下部に防油堤を備えたケーシングの内部に、エンジンと、該エンジンにより駆動される発電機と、前記エンジンに供給する燃料を貯留する燃料タンクと、該燃料タンク内から燃料フィードポンプで吸引した燃料を前記エンジンに供給する燃料送出管と、前記エンジンで消費されなかった燃料をエンジンから前記燃料タンクに返送する燃料返送管とを備えた可搬式エンジン発電機において、前記燃料送出管の前記燃料フィードポンプ側に第１流量計を、該燃料送出管の前記エンジン側に第２流量計を、前記燃料返送管のエンジン側に第３流量計を、該燃料返送管の前記燃料タンク側に第４流量計をそれぞれ設け、前記発電機の発電状態から前記エンジンの燃料消費量を求める燃料消費量算出手段を設けるとともに、前記第１流量計の計測値に対して前記第２流量計の計測値があらかじめ設定された流量差を超えたときに前記燃料送出管の部分で燃料漏れが発生したと判定し、前記第３流量計の計測値に対して前記第４流量計の計測値があらかじめ設定された流量差を超えたときに前記燃料返送管の部分で燃料漏れが発生したと判定し、前記第１流量計の計測値又は前記第２流量計の計測値から前記第３流量計の計測値又は前記第４流量計の計測値を差し引いた燃料供給量と前記燃料消費量算出手段で求めた燃料消費量とを比較し、燃料供給量が燃料消費量に対してあらかじめ設定された量以上に多くなったときに前記エンジンの部分で燃料漏れが発生したと判定する判定手段を設け、該判定手段が燃料漏れの発生を判定したときに警報を発生する警報発生手段を備えていることを特徴とし、さらに、前記判定手段が燃料漏れの発生を判定したときに、前記エンジンを停止させるエンジン制御手段を備えていることを特徴としている。   In order to achieve the above object, a portable engine generator according to the present invention includes an engine, a generator driven by the engine, and fuel supplied to the engine in a casing having an oil bank at the bottom. A fuel tank to be stored; a fuel delivery pipe for supplying fuel sucked from the fuel tank by a fuel feed pump to the engine; and a fuel return pipe for returning fuel not consumed by the engine from the engine to the fuel tank; A first flow meter on the fuel feed pump side of the fuel delivery pipe, a second flow meter on the engine side of the fuel delivery pipe, and an engine side of the fuel return pipe. A third flow meter is provided on the fuel tank side of the fuel return pipe, and a fourth flow meter is provided on each side of the fuel return pipe to determine the fuel consumption of the engine from the power generation state of the generator. In addition to providing a quantity calculation means, when the measured value of the second flow meter exceeds a preset flow rate difference with respect to the measured value of the first flow meter, a fuel leak occurred in the portion of the fuel delivery pipe When the measured value of the fourth flow meter exceeds a preset flow rate difference with respect to the measured value of the third flow meter, it is determined that a fuel leak has occurred in the fuel return pipe portion. The fuel supply amount obtained by subtracting the measurement value of the third flow meter or the measurement value of the fourth flow meter from the measurement value of the first flow meter or the measurement value of the second flow meter, and the fuel consumption calculation means Comparing with the determined fuel consumption, provided with a determination means for determining that a fuel leak has occurred in the part of the engine when the fuel supply amount is greater than a predetermined amount with respect to the fuel consumption, The judging means judges the occurrence of fuel leakage. It is characterized by comprising alarm generating means for generating an alarm sometimes, and further comprising engine control means for stopping the engine when the determination means determines the occurrence of fuel leakage. Yes.

本発明の可搬式エンジン発電機によれば、各流量計の測定値とエンジンの燃料消費量とに基づいて燃料漏れの発生を確実に検出することができるとともに、燃料漏れの発生部分を燃料送出管、燃料返送管及びエンジンのいずれかに特定することもできる。これにより、燃料漏れの原因を容易に特定することができるので、大量の燃料が防油堤を越えて外部に漏れ出すことを防止でき、可搬式エンジン発電機に設けられている防油堤を省略したり、防油堤の容積を小さくしたりすることができ、防油堤を含めたエンジン発電機の小型化を図ることができる。   According to the portable engine generator of the present invention, it is possible to reliably detect the occurrence of a fuel leak based on the measured value of each flow meter and the fuel consumption of the engine, and to transmit the fuel leak occurrence portion to the fuel. It can also be specified as a pipe, a fuel return pipe, or an engine. As a result, the cause of the fuel leakage can be easily identified, so that a large amount of fuel can be prevented from leaking outside the oil breakwater, and the oil breakwater provided in the portable engine generator can be prevented. It can be omitted or the volume of the oil breakwater can be reduced, and the engine generator including the oil breakwater can be downsized.

本発明のエンジン発電機の一形態例を示す断面正面図である。It is a section front view showing an example of an engine generator of the present invention. 燃料漏れを検出する制御手段部分の一例を示すブロック図である。It is a block diagram which shows an example of the control means part which detects a fuel leak. 燃料漏れの検出手順の一例を示すフローチャートである。It is a flowchart which shows an example of the detection procedure of a fuel leak. エンジンの負荷率と燃料消費量との関係の一例を示す図である。It is a figure which shows an example of the relationship between an engine load factor and fuel consumption.

まず、図１に示すように、本形態例に示す可搬式エンジン発電機は、エンジン（ディーゼルエンジン）１１で発電機１２を駆動して負荷に電力を供給するものであって、防音構造を有するケーシング１３の下部に設けられた架台１４上に前記エンジン１１及び発電機１２を水平方向に配列するとともに、架台１４の下方に大容量の燃料タンク１５を配置している。   First, as shown in FIG. 1, the portable engine generator shown in this embodiment is configured to drive a generator 12 with an engine (diesel engine) 11 to supply power to a load, and has a soundproof structure. The engine 11 and the generator 12 are arranged in a horizontal direction on a gantry 14 provided at a lower portion of the casing 13, and a large-capacity fuel tank 15 is disposed below the gantry 14.

また、架台１４上におけるエンジン１１側には、エンジン１１の運転に必要なバッテリ１６やラジエータ１７、エアクリーナ１８，排気管１９などが配置され、発電機１２側には、エンジン１１や発電機１２などを制御したりするための制御盤２０が設けられている。また、エンジン１１と燃料タンク１５との間には、燃料フィードポンプ２１及び燃料送出管２２、燃料返送管２３を含む燃料系統が設けられている。   Further, a battery 16, a radiator 17, an air cleaner 18, an exhaust pipe 19, and the like necessary for the operation of the engine 11 are arranged on the gantry 14 side, and the engine 11, the generator 12, and the like are arranged on the generator 12 side. A control panel 20 is provided for controlling the control. A fuel system including a fuel feed pump 21, a fuel delivery pipe 22 and a fuel return pipe 23 is provided between the engine 11 and the fuel tank 15.

架台１４の下部には、底板２４及び側壁２５により底部及び四周を密閉した防油堤２６が、前記燃料タンク１５の下半部を囲むようにして設けられている。発電機１２側の側壁２５の下部には、防油堤２６内の液を排出するためのドレン２７が設けられ、防油堤２６の内部には、防油堤２６内の液位があらかじめ設定された高液位に達したときに高液位信号を出力する高液位センサ２８と、防油堤２６内の液位が前記高液位より低いあらかじめ設定された低液位に達したときに低液位信号を出力する低液位センサ２９とが設けられている。   An oil breakwater 26 whose bottom and four sides are sealed by a bottom plate 24 and a side wall 25 is provided at the bottom of the gantry 14 so as to surround the lower half of the fuel tank 15. A drain 27 for discharging the liquid in the oil breakwater 26 is provided below the side wall 25 on the generator 12 side, and the liquid level in the oil breakwater 26 is preset in the oil breakwater 26. A high liquid level sensor 28 that outputs a high liquid level signal when the high liquid level is reached, and when the liquid level in the oil barrier 26 reaches a preset low liquid level lower than the high liquid level. And a low liquid level sensor 29 for outputting a low liquid level signal.

このように形成した可搬式エンジン発電機において、図２に示すように、前記燃料送出管２２の前記燃料フィードポンプ２１側には、前記燃料タンク１５内から燃料フィードポンプ２１で吸引して燃料送出管２２に流入する燃料の流量を計測する第１流量計３１が設けられるとともに、該燃料送出管２２の前記エンジン１１側には、該燃料送出管２２を通ってエンジン１１に供給される燃料の流量を計測する第２流量計３２が設けられている。   In the portable engine generator formed in this way, as shown in FIG. 2, the fuel feed pump 21 draws fuel from the fuel tank 15 to the fuel feed pump 21 side of the fuel delivery pipe 22 and feeds the fuel. A first flow meter 31 for measuring the flow rate of the fuel flowing into the pipe 22 is provided, and on the engine 11 side of the fuel delivery pipe 22, the fuel supplied to the engine 11 through the fuel delivery pipe 22 is provided. A second flow meter 32 for measuring the flow rate is provided.

また、前記燃料返送管２３のエンジン１１側には、エンジン１１から燃料返送管２３に戻された燃料の流量を計測する第３流量計３３が設けられるとともに、該燃料返送管２３の燃料タンク１５側には、該燃料返送管２３を通って燃料タンク１５に戻される燃料の流量を計測する第４流量計３４が設けられている。 A third flow meter 33 for measuring the flow rate of the fuel returned from the engine 11 to the fuel return pipe 23 is provided on the engine return side of the fuel return pipe 23, and the fuel tank 15 of the fuel return pipe 23 is provided. On the side, a fourth flow meter 34 for measuring the flow rate of the fuel returned to the fuel tank 15 through the fuel return pipe 23 is provided.

前記第１流量計３１は燃料フィードポンプ２１の燃料吐出部に、第２流量計３２はエンジン１１の燃料供給部にそれぞれ直結させた状態で燃料送出管２２の両端部に設けることが好ましく、第３流量計３３はエンジン１１の燃料返送部に、第４流量計３４は燃料タンク１５の燃料戻り部にそれぞれ直結させた状態で燃料返送管２３の両端部に設けることが好ましい。また、燃料フィードポンプ２１の燃料吸引側には、エンジン１１への燃料の供給を強制的に遮断するためのストップバルブ３５が設けられている。   The first flow meter 31 is preferably provided at both ends of the fuel delivery pipe 22 in a state of being directly connected to the fuel discharge portion of the fuel feed pump 21 and the second flow meter 32 to the fuel supply portion of the engine 11. The three flow meters 33 are preferably provided at both ends of the fuel return pipe 23 in a state of being directly connected to the fuel return portion of the engine 11 and the fourth flow meter 34 to the fuel return portion of the fuel tank 15. A stop valve 35 for forcibly shutting off the fuel supply to the engine 11 is provided on the fuel suction side of the fuel feed pump 21.

エンジン１１によって駆動される前記発電機１２には、負荷に供給している電力量、周波数、力率などから発電機１２の発電状態を検出する電力量センサ３６ａが設けられている。さらに、該発電状態に基づいて前記エンジン１１の負荷率を求めることにより、エンジン１１の燃料消費量を求める燃料消費量算出手段３６ｂが設けられている。この燃料消費量算出手段３６ｂで求めた燃料消費量と、前記各流量計３１，３２，３３，３４で計測した燃料の流量計測値とは、燃料漏れの有無を判定するための演算用データとして判定手段３７に取り込まれる。さらに、判定手段３７には、該判定手段３７が燃料漏れが発生したと判定したときに、判定手段３７からの信号によって作動するエンジン制御手段３８と警報発生手段３９ａ，３９ｂとが接続されている。また、該判定手段３７には、両液位センサ２８，２９からの液位検出信号も入力されている。   The generator 12 driven by the engine 11 is provided with an electric energy sensor 36a that detects the electric power generation state of the generator 12 from the electric energy supplied to the load, the frequency, the power factor, and the like. Further, a fuel consumption calculating means 36b for determining the fuel consumption of the engine 11 by determining the load factor of the engine 11 based on the power generation state is provided. The fuel consumption calculated by the fuel consumption calculation means 36b and the fuel flow measurement values measured by the flow meters 31, 32, 33, and 34 are used as calculation data for determining the presence or absence of fuel leakage. It is taken into the judging means 37. Further, the determination means 37 is connected to an engine control means 38 and alarm generation means 39a and 39b that are operated by a signal from the determination means 37 when the determination means 37 determines that a fuel leak has occurred. . The determination means 37 also receives liquid level detection signals from both liquid level sensors 28 and 29.

判定手段３７では、前記各流量計３１，３２，３３，３４でそれぞれ計測した燃料の流量計測値と前記燃料消費量とに基づいて燃料漏れの有無を判定する。まず、前記第１流量計３１の計測値に対して前記第２流量計３２の計測値があらかじめ設定された流量差を超えたときに、前記燃料送出管２２の部分で燃料漏れが発生したと判定する。また、前記第３流量計３３の計測値に対して前記第４流量計３４の計測値があらかじめ設定された流量差を超えたときに前記燃料返送管２３の部分で燃料漏れが発生したと判定する。これにより、燃料送出管２２や燃料返送管２３の損傷による燃料漏れや配管接続部の緩みなどによる燃料漏れの発生を早期に確実に検出することができる。   The determination means 37 determines the presence or absence of fuel leakage based on the fuel flow rate measurement values measured by the flow meters 31, 32, 33, and 34 and the fuel consumption. First, when a measured value of the second flow meter 32 exceeds a preset flow rate difference with respect to a measured value of the first flow meter 31, a fuel leak has occurred in the fuel delivery pipe 22 portion. judge. Further, when the measured value of the fourth flow meter 34 exceeds a preset flow rate difference with respect to the measured value of the third flow meter 33, it is determined that a fuel leak has occurred in the fuel return pipe 23. To do. Thereby, the occurrence of fuel leakage due to damage to the fuel delivery pipe 22 or the fuel return pipe 23 or the looseness of the pipe connection portion can be reliably detected at an early stage.

さらに、判定手段３７では、第１流量計３１の計測値又は第２流量計３２の計測値と、第３流量計３３の計測値又は第４流量計３４の計測値と、燃料消費量算出手段３６ｂで求めた燃料消費量とに基づいて、エンジン１１の部分での燃料漏れの有無の判定を行う。このとき、第１流量計３１と第２流量計３２とは、１本の燃料送出管２２の両端部に設けられており、燃料送出管２２の部分に燃料漏れが無い場合には両流量計が同じ計測値を示すので、第１流量計３１の計測値及び第２流量計３２の計測値のいずれか一方の計測値を燃料送出量として採用すればよい。また、第３流量計３３と第４流量計３４とは、１本の燃料返送管２３の両端部に設けられており、燃料返送管２３の部分に燃料漏れが無い場合には両流量計が同じ計測値を示すので、第３流量計３３の計測値及び第４流量計３４の計測値のいずれか一方の計測値を燃料返送量として採用すればよい。   Further, in the determination means 37, the measurement value of the first flow meter 31 or the measurement value of the second flow meter 32, the measurement value of the third flow meter 33 or the measurement value of the fourth flow meter 34, and the fuel consumption calculation means Based on the fuel consumption obtained in 36b, it is determined whether or not there is a fuel leak in the portion of the engine 11. At this time, the first flow meter 31 and the second flow meter 32 are provided at both ends of one fuel delivery pipe 22, and when there is no fuel leakage in the fuel delivery pipe 22, both flow meters Indicate the same measured value, and either one of the measured value of the first flow meter 31 and the measured value of the second flow meter 32 may be adopted as the fuel delivery amount. The third flow meter 33 and the fourth flow meter 34 are provided at both ends of one fuel return pipe 23. When there is no fuel leakage in the fuel return pipe 23, both flow meters are provided. Since the same measurement value is shown, any one of the measurement value of the third flow meter 33 and the measurement value of the fourth flow meter 34 may be adopted as the fuel return amount.

第１流量計３１又は第２流量計３２で計測した前記燃料送出量から第３流量計３３又は第４流量計３４で計測した前記燃料返送量を差し引いた燃料の量、すなわちエンジン１１への燃料供給量と、燃料消費量算出手段３６ｂで求めたエンジン１１の燃料消費量とを比較し、燃料供給量が燃料消費量をあらかじめ設定された量以上に超えたときにエンジン１１の部分で燃料漏れが発生していると判定する。   The amount of fuel obtained by subtracting the fuel return amount measured by the third flow meter 33 or the fourth flow meter 34 from the fuel delivery amount measured by the first flow meter 31 or the second flow meter 32, that is, the fuel to the engine 11 A comparison is made between the supply amount and the fuel consumption amount of the engine 11 obtained by the fuel consumption amount calculation means 36b. When the fuel supply amount exceeds the fuel consumption amount that is set in advance, the fuel leaks in the engine 11 portion. Is determined to have occurred.

図３は、燃料漏れの有無を判定する手順の一例を示すもので、まず、最初のステップ５１でエンジンキーをＯＮにすると燃料フィードポンプ２１が作動を開始し、ステップ５２でストップバルブ３５が開くとエンジン１１への燃料の供給が始まる。この状態でエンジンキーをスタート位置にするとエンジン１１が始動して発電機１２が発電を開始する。   FIG. 3 shows an example of a procedure for determining the presence or absence of fuel leakage. First, when the engine key is turned ON in the first step 51, the fuel feed pump 21 starts operating, and in step 52, the stop valve 35 is opened. The fuel supply to the engine 11 begins. In this state, when the engine key is set to the start position, the engine 11 is started and the generator 12 starts power generation.

可搬式エンジン発電機の運転中、ステップ５３では、各流量計での燃料の流量計測が行われ、ステップ５４で前記燃料送出量と前記燃料返送量とに基づいてエンジン１１への燃料供給量が算出される。また、ステップ５５では、発電機１２の発電状態に基づいてエンジン１１の負荷率を求め、ステップ５６で、図４に示すエンジン１１の負荷率と燃料消費量との関係からエンジン１１における燃料消費量を求める。   During operation of the portable engine generator, in step 53, the flow rate of fuel is measured by each flow meter, and in step 54, the fuel supply amount to the engine 11 is determined based on the fuel delivery amount and the fuel return amount. Calculated. Further, in step 55, the load factor of the engine 11 is obtained based on the power generation state of the generator 12, and in step 56, the fuel consumption amount in the engine 11 from the relationship between the load factor of the engine 11 and the fuel consumption amount shown in FIG. Ask for.

ステップ５７では、ステップ５４で求めた燃料供給量とステップ５６で求めた燃料消費量とが比較され、燃料供給量が燃料消費量に対してあらかじめ設定された量以上に多い場合は、エンジン１１で燃料漏れが発生したと判定してステップ５８に進む。ステップ５８では、判定手段３７からの信号によってエンジン制御手段３８がエンジン１１を停止させ、続いてステップ５９でストップバルブ３５が閉じてエンジン１１への燃料の供給が遮断される。さらに、ステップ６０では、判定手段３７からのエンジン１１の部分で燃料漏れが発生したことに対応する信号により、警報発生手段３９ａ，３９ｂが作動して警報２が出力される。この警報２は、ステップ６１で警報リセット操作が行われるまで継続し、ステップ６１で警報リセット操作が行われるとステップ６２で警報２が停止して一連の手順が終了する。   In step 57, the fuel supply amount obtained in step 54 is compared with the fuel consumption amount obtained in step 56. If the fuel supply amount is greater than a predetermined amount with respect to the fuel consumption amount, the engine 11 It is determined that a fuel leak has occurred, and the routine proceeds to step 58. In step 58, the engine control means 38 stops the engine 11 by a signal from the determination means 37, and then in step 59, the stop valve 35 is closed and the fuel supply to the engine 11 is shut off. Further, in step 60, the alarm generation means 39a and 39b are activated by the signal corresponding to the occurrence of fuel leakage in the engine 11 portion from the determination means 37, and the alarm 2 is output. This alarm 2 continues until the alarm reset operation is performed in step 61. When the alarm reset operation is performed in step 61, the alarm 2 is stopped in step 62 and the series of procedures is completed.

また、ステップ５７で燃料供給量が燃料消費量に対してあらかじめ設定された量以上に多くなっていない場合には、エンジン１の部分で燃料漏れが発生していないと判定し、ステップ６３に進んで第１流量計３１の計測値（流量１）と第２流量計３２の計測値（流量２）とを比較する。このとき、流量１に比べて流量２が多い場合は、燃料送出管２２の上流側の流量より下流側の流量が多いことになり、第１流量計３１又は第２流量計３２が故障したことが考えられるので、ステップ６４に進んで警報発生手段３９ａ，３９ｂから警報１を出力し、第１流量計３１及び第２流量計３２の点検を促した状態にしてからステップ５３に戻る。   On the other hand, if the fuel supply amount does not exceed the fuel consumption amount set in advance in step 57, it is determined that no fuel leakage has occurred in the engine 1, and the process proceeds to step 63. Then, the measurement value (flow rate 1) of the first flow meter 31 and the measurement value (flow rate 2) of the second flow meter 32 are compared. At this time, when the flow rate 2 is higher than the flow rate 1, the flow rate on the downstream side is higher than the flow rate on the upstream side of the fuel delivery pipe 22, and the first flow meter 31 or the second flow meter 32 has failed. Therefore, the process proceeds to step 64, where the alarm 1 is output from the alarm generation means 39a, 39b, the inspection of the first flow meter 31 and the second flow meter 32 is prompted, and the process returns to step 53.

また、前記ステップ６３で流量１と流量２とが等しい場合は、正常な状態であると判定してステップ６５に進み、前記警報１が出力されている場合には警報１を停止してから運転中の最初のステップ５３に戻る。例えば、急激な流量変動などによる一時的な異常状態が発生してステップ６３からステップ６４に進んで警報１が出力された場合は、ステップ６３からステップ６５に進んだことによって警報１が停止するので、一時的な異常状態が解消されたことを確認できる。   If the flow rate 1 is equal to the flow rate 2 in step 63, it is determined that the flow is normal and the process proceeds to step 65. If the warning 1 is output, the warning 1 is stopped and the operation is started. Return to the first step 53. For example, when a temporary abnormal state due to a rapid flow rate change or the like occurs and the alarm 1 is output from step 63 to step 64, the alarm 1 is stopped by proceeding to step 65 from step 63. It can be confirmed that the temporary abnormal state has been resolved.

そして、ステップ６３で流量１に比べて流量２が少ない場合は、燃料送出管２２の上流側の流量より下流側の流量が少なくなっていることから、燃料送出管２２の部分で液漏れが発生していると判定し、ステップ６６に進む。ステップ６６では、前記ステップ５８と同様に、判定手段３７からの信号によってエンジン制御手段３８がエンジン１１を停止させ、続いてステップ６７でストップバルブ３５が閉じてエンジン１１への燃料の供給が遮断される。さらに、ステップ６８で燃料送出管２２の部分で液漏れが発生したことに対応する信号により、警報発生手段３９ａ，３９ｂが作動して警報３が出力される。この警報３は、ステップ６９で警報リセット操作が行われるまで継続し、ステップ６９で警報リセット操作が行われるとステップ７０で警報３が停止して一連の手順が終了する。   When the flow rate 2 is smaller than the flow rate 1 in step 63, the flow rate on the downstream side is smaller than the flow rate on the upstream side of the fuel delivery tube 22, so that liquid leakage occurs in the portion of the fuel delivery tube 22. The process proceeds to step 66. In step 66, as in step 58, the engine control means 38 stops the engine 11 by a signal from the determination means 37. Subsequently, in step 67, the stop valve 35 is closed and the supply of fuel to the engine 11 is shut off. The Further, in response to the signal corresponding to the occurrence of liquid leakage in the portion of the fuel delivery pipe 22 in step 68, the alarm generation means 39a and 39b are activated and the alarm 3 is output. This alarm 3 continues until an alarm reset operation is performed in step 69, and when an alarm reset operation is performed in step 69, alarm 3 is stopped in step 70 and a series of procedures is completed.

また、第３流量計３３の計測値を流量１、第４流量計３４の計測値を流量２とすることにより、前記同様の手順で燃料返送管２３の部分における燃料漏れの有無の判定や両流量計３３，３４の状態を確認することができる。さらに、各流量計の計測値やエンジン１１への燃料供給量を監視することにより、各流量計の状態やエンジン１１の状態を確認することができる。   Further, by setting the measurement value of the third flow meter 33 to flow rate 1 and the measurement value of the fourth flow meter 34 to flow rate 2, it is possible to determine whether or not there is a fuel leak in the fuel return pipe 23 in the same procedure as described above. The state of the flow meters 33 and 34 can be confirmed. Furthermore, the state of each flow meter and the state of the engine 11 can be confirmed by monitoring the measured value of each flow meter and the amount of fuel supplied to the engine 11.

前記ステップ５７における燃料供給量と燃料消費量との比較においては、エンジンの個体差、経年変化、流量計の精度などの各種条件に応じた補正量を設定し、エンジン１１の負荷率から求めた燃料消費量に前記補正量を加えた量をあらかじめ設定し、燃料消費量に補正量を加えた量と前記燃料供給量とを比較して燃料漏れの有無を判定する。図４に示すように、負荷率１００％のときの燃料消費量が毎時１７０リットル、負荷率５０％のときの燃料消費量が毎時１０５リットル、負荷率０％（アイドリング）のときの燃料消費量が毎時３５リットルとなるエンジン１１の場合は、例えば、各負荷率における燃料消費量に、補正量として例えば毎時１リットルを加えた量を比較対象とする。例えば、負荷率が５０％の場合、通常の燃料消費量は毎時１０５リットルであるから、これに毎時１リットルを加えた毎時１０６リットルを燃料供給量との比較対象とし、燃料供給量が毎時１０６リットル以上になったときに燃料漏れと判定するように設定すればよい。同様に、ステップ６３における流量１と流量２との比較においても、流量１の上下１％未満の流量差の場合には、誤差範囲としてステップ６５に進むように設定することにより、判定動作の安定化を図ることができる。   In the comparison between the fuel supply amount and the fuel consumption amount in step 57, correction amounts were set according to various conditions such as individual differences in the engine, aging, and accuracy of the flowmeter, and obtained from the load factor of the engine 11. An amount obtained by adding the correction amount to the fuel consumption amount is set in advance, and the amount obtained by adding the correction amount to the fuel consumption amount is compared with the fuel supply amount to determine the presence or absence of fuel leakage. As shown in FIG. 4, the fuel consumption when the load factor is 100% is 170 liters per hour, the fuel consumption when the load factor is 50% is 105 liters per hour, and the fuel consumption is when the load factor is 0% (idling). In the case of the engine 11 having an engine speed of 35 liters per hour, for example, an amount obtained by adding, for example, 1 liter per hour as a correction amount to the fuel consumption amount at each load factor is used as a comparison target. For example, when the load factor is 50%, the normal fuel consumption is 105 liters per hour. Therefore, 106 liters per hour obtained by adding 1 liter per hour to the fuel supply amount is compared with the fuel supply amount of 106 liters per hour. What is necessary is just to set so that a fuel leak may be determined when it becomes more than a liter. Similarly, in the comparison between the flow rate 1 and the flow rate 2 in step 63, if the flow rate difference is less than 1% above and below the flow rate 1, the determination range is stabilized by setting the error range to advance to step 65. Can be achieved.

また、燃料漏れの判定は、例えば、各流量や燃料消費量を数分間積算して判定に用いたり、流量１と流量２とが異なっている時間や流量差、燃料供給量が燃料消費量を超えている時間と超えた量とで判定したりするなど、エンジン発電機の運転状態、すなわち、負荷の変動状態に応じて判定条件を設定することが可能である。さらに、判定手段３７に前記両液位センサ２８，２９からの信号を取り込むことにより、雨水の浸入などによって高液位センサ２８が防油堤２６内の高液位を検出したときには少量の燃料漏れでも直ちにエンジン停止して警報出力を行うように設定し、防油堤２６内がほとんど空の状態で低液位センサ２９まで液位が上昇していないときには、警報出力のみを行ってエンジン停止を行わないように設定することもできる。   In addition, the determination of fuel leakage may be performed by, for example, integrating each flow rate and fuel consumption for several minutes, or using the time, flow rate difference between the flow rate 1 and the flow rate 2 and the fuel supply amount as the fuel consumption amount. It is possible to set a determination condition according to the operating state of the engine generator, that is, the load fluctuation state, such as determination based on the exceeding time and the exceeding amount. Further, by taking the signals from the both liquid level sensors 28 and 29 into the judging means 37, a small amount of fuel leaks when the high liquid level sensor 28 detects a high liquid level in the oil barrier 26 due to the intrusion of rainwater or the like. However, the engine is immediately stopped and an alarm is output. When the oil barrier 26 is almost empty and the liquid level does not rise to the low liquid level sensor 29, only the alarm is output and the engine is stopped. It can also be set not to do.

さらに、電力供給先の事情により、発電機１２の緊急停止が望ましくない場合、例えば、消防用ポンプや手術用電源などに電源を供給しており、僅かな燃料漏れよりも電源供給の継続が優先する場合は、前記ステップ５８，５９及びステップ６６，６７を無効とし、警報のみを出力するように設定し、消火や手術が終了してからエンジン１１を停止させるようにすることもできる。   In addition, when the emergency stop of the generator 12 is not desirable due to the circumstances of the power supply destination, for example, power is supplied to a fire pump or surgical power supply, and continuation of power supply has priority over slight fuel leakage. In this case, the steps 58 and 59 and the steps 66 and 67 are invalidated, and only the alarm is set to be output, and the engine 11 can be stopped after the extinction or the operation is completed.

また、燃料フィードポンプ２１として、エンジン１１の運転状態に関係なくバッテリーで作動するものを使用した場合は、エンジンキーをＯＮにすると、燃料フィードポンプ２１が作動するので、ストップバルブ３５が開いていれば、燃料タンク１５内の燃料は、燃料フィードポンプ２１から燃料送出管２２、エンジン１１、燃料返送管２３を通って燃料タンク１５に全量が循環するので、このときの各流量計の計測値が全て同一であれば、燃料漏れが発生していないこと、各流量計が正常に作動していることを確認できる。   In addition, when a fuel feed pump 21 that operates on a battery regardless of the operating state of the engine 11 is used, the fuel feed pump 21 operates when the engine key is turned ON, so that the stop valve 35 is open. For example, all the fuel in the fuel tank 15 is circulated from the fuel feed pump 21 to the fuel tank 15 through the fuel delivery pipe 22, the engine 11, and the fuel return pipe 23. If all are the same, it can be confirmed that there is no fuel leakage and that each flowmeter is operating normally.

本形態例に示す可搬式エンジン発電機では、燃料漏れが発生したときにエンジン１１を停止させるエンジン制御手段３８と警報を出力する警報発生手段３９ａ，３９ｂとを設けているが、通常運転時に発電機の操作員が操作可能な状態で使用される可搬式エンジン発電機では、警報発生手段３９ａ，３９ｂのみを設けるようにしてもよく、エンジン制御手段３８と警報発生手段３９ａ，３９ｂとを設け、エンジン制御手段３８の動作を有効／無効に切り替えるエンジン制御選択手段を設けるようにしてもよい。   In the portable engine generator shown in this embodiment, the engine control means 38 for stopping the engine 11 and the alarm generation means 39a and 39b for outputting an alarm are provided when a fuel leak occurs. In the portable engine generator used in a state where the operator of the machine can operate, only the alarm generation means 39a and 39b may be provided, the engine control means 38 and the alarm generation means 39a and 39b are provided, Engine control selection means for switching the operation of the engine control means 38 between valid and invalid may be provided.

また、警報発生手段３９ａ，３９ｂは、任意の警報出力手段を採用することができ、警告灯、警報などを適宜に組み合わせることができる。前記図３に示した手順における警報１，警報２，警報３は、例えば、警報１では一方の警報発生手段３９ａのみが作動し、警報２では他方の警報発生手段３９ｂのみが作動し、警報３では両方の警報発生手段３９ａ，３９ｂが作動するように設定することができる。   Further, the alarm generation means 39a and 39b can employ arbitrary alarm output means, and can appropriately combine warning lights and alarms. For example, alarm 1, alarm 2, and alarm 3 in the procedure shown in FIG. 3 are such that, for alarm 1, only one alarm generating means 39a is activated, and in alarm 2, only the other alarm generating means 39b is activated. Then, both alarm generation means 39a and 39b can be set to operate.

１１…エンジン、１２…発電機、１３…ケーシング、１４…架台、１５…燃料タンク、１６…バッテリ、１７…ラジエータ、１８…エアクリーナ、１９…排気管、２０…制御盤、２１…燃料フィードポンプ、２２…燃料送出管、２３…燃料返送管、２４…底板、２５…側壁、２６…防油堤、２７…ドレン、２８…高液位センサ、２９…低液位センサ、３１…第１流量計、３２…第２流量計、３３…第３流量計、３４…第４流量計、３５…ストップバルブ、３６ａ…電力量センサ、３６ｂ…燃料消費量算出手段、３７…判定手段、３８…エンジン制御手段、３９ａ，３９ｂ…警報発生手段   DESCRIPTION OF SYMBOLS 11 ... Engine, 12 ... Generator, 13 ... Casing, 14 ... Mount, 15 ... Fuel tank, 16 ... Battery, 17 ... Radiator, 18 ... Air cleaner, 19 ... Exhaust pipe, 20 ... Control panel, 21 ... Fuel feed pump, DESCRIPTION OF SYMBOLS 22 ... Fuel delivery pipe | tube, 23 ... Fuel return pipe | tube, 24 ... Bottom plate, 25 ... Side wall, 26 ... Oil barrier, 27 ... Drain, 28 ... High liquid level sensor, 29 ... Low liquid level sensor, 31 ... 1st flow meter 32 ... second flow meter, 33 ... third flow meter, 34 ... fourth flow meter, 35 ... stop valve, 36a ... electric energy sensor, 36b ... fuel consumption calculation means, 37 ... determination means, 38 ... engine control Means, 39a, 39b ... alarm generating means

Claims (2)

下部に防油堤を備えたケーシングの内部に、エンジンと、該エンジンにより駆動される発電機と、前記エンジンに供給する燃料を貯留する燃料タンクと、該燃料タンク内から燃料フィードポンプで吸引した燃料を前記エンジンに供給する燃料送出管と、前記エンジンで消費されなかった燃料をエンジンから前記燃料タンクに返送する燃料返送管とを備えた可搬式エンジン発電機において、前記燃料送出管の前記燃料フィードポンプ側に第１流量計を、該燃料送出管の前記エンジン側に第２流量計を、前記燃料返送管のエンジン側に第３流量計を、該燃料返送管の前記燃料タンク側に第４流量計をそれぞれ設け、前記発電機の発電状態から前記エンジンの燃料消費量を求める燃料消費量算出手段を設けるとともに、前記第１流量計の計測値に対して前記第２流量計の計測値があらかじめ設定された流量差を超えたときに前記燃料送出管の部分で燃料漏れが発生したと判定し、前記第３流量計の計測値に対して前記第４流量計の計測値があらかじめ設定された流量差を超えたときに前記燃料返送管の部分で燃料漏れが発生したと判定し、前記第１流量計の計測値又は前記第２流量計の計測値から前記第３流量計の計測値又は前記第４流量計の計測値を差し引いた燃料供給量と前記燃料消費量算出手段で求めた燃料消費量とを比較し、燃料供給量が燃料消費量に対してあらかじめ設定された量以上に多くなったときに前記エンジンの部分で燃料漏れが発生したと判定する判定手段を設け、該判定手段が燃料漏れの発生を判定したときに警報を発生する警報発生手段を備えていることを特徴とする可搬式エンジン発電機。   An engine, a generator driven by the engine, a fuel tank for storing fuel to be supplied to the engine, and a fuel feed pump sucked from the fuel tank inside a casing having an oil bank at the bottom. A portable engine generator comprising: a fuel delivery pipe for supplying fuel to the engine; and a fuel return pipe for returning fuel not consumed by the engine from the engine to the fuel tank, wherein the fuel in the fuel delivery pipe A first flow meter on the feed pump side, a second flow meter on the engine side of the fuel delivery pipe, a third flow meter on the engine side of the fuel return pipe, and a third flow meter on the fuel tank side of the fuel return pipe 4 flow meters are provided, and fuel consumption calculation means for obtaining the fuel consumption of the engine from the power generation state of the generator is provided, and the measured value of the first flow meter is adjusted. When the measured value of the second flow meter exceeds a preset flow rate difference, it is determined that a fuel leak has occurred in the fuel delivery pipe, and the measured value of the third flow meter is compared with the measured value of the third flow meter. 4 When the measured value of the flow meter exceeds a preset flow rate difference, it is determined that a fuel leak has occurred in the fuel return pipe, and the measured value of the first flow meter or the measured value of the second flow meter The fuel supply amount obtained by subtracting the measurement value of the third flow meter or the measurement value of the fourth flow meter from the value and the fuel consumption amount obtained by the fuel consumption amount calculation means are compared, and the fuel supply amount is the fuel consumption amount. Is provided with a determination means for determining that a fuel leak has occurred in the engine portion when the amount exceeds a preset amount, and an alarm is generated when the determination means determines that a fuel leak has occurred. Features alarm generation means Portable engine generator to be. 前記判定手段が燃料漏れの発生を判定したときに、前記エンジンを停止させるエンジン制御手段を備えていることを特徴とする請求項１記載の可搬式エンジン発電機。   The portable engine generator according to claim 1, further comprising engine control means for stopping the engine when the determination means determines the occurrence of fuel leakage.
JP2012111359A 2012-05-15 2012-05-15 Portable engine generator Pending JP2013238161A (en)

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