JP2014084774A - Engine generator - Google Patents

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JP2014084774A
JP2014084774A JP2012233495A JP2012233495A JP2014084774A JP 2014084774 A JP2014084774 A JP 2014084774A JP 2012233495 A JP2012233495 A JP 2012233495A JP 2012233495 A JP2012233495 A JP 2012233495A JP 2014084774 A JP2014084774 A JP 2014084774A
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fuel
engine
fuel consumption
calculation formula
consumption calculation
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JP6222914B2 (en
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Taku Homma
拓 本間
Toshikazu Watanabe
俊和 渡辺
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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 an engine generator including detection means capable of surely detecting the occurrence of fuel leakage while considering secular change of an engine.SOLUTION: The engine generator includes: a delivery flowmeter 31 for measuring a flow rate of a fuel passing a fuel delivery pipe 22; a return flowmeter 32 for measuring a flow rate of the fuel passing a fuel return pipe 23; electric power measuring means 33 for measuring electric power generated by a generator 12; and determination means 34 that compares a fuel supply amount to an engine, which is obtained by subtracting a measurement value of the return flowmeter from a measurement value of the delivery flowmeter, with engine fuel consumption calculated by a preset fuel consumption calculation expression on the basis of the generated electric power measured by the electric power measuring means, and determines the occurrence of fuel leakage when the fuel supply amount exceeds a preset amount for the fuel consumption,. The determination means includes fuel consumption calculation expression correction means 37 for correcting the fuel consumption calculation expression based on a use period of the engine.

Description

本発明は、エンジン発電機に関し、詳しくは、エンジンで発電機を駆動する可搬式のエンジン発電機における燃料漏れを検出する検出手段を備えたエンジン発電機に関する。   The present invention relates to an engine generator, and more particularly to an engine generator provided with detection means for detecting fuel leakage in a portable engine generator that drives a generator with an engine.

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、燃料漏れの検出条件が初期設定のままでは、経年変化によってエンジンの燃費性能が低下して燃料を多く消費するようになったときに燃料漏れが発生したと判定し、警報を発したり、エンジンを強制的に停止させたりして負荷への電力供給が断たれてしまうおそれがあった。   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, if the fuel leak detection condition remains at the default setting, it is determined that the fuel leak has occurred when the fuel efficiency of the engine has deteriorated due to secular change and the fuel has been consumed. There is a possibility that the power supply to the load is cut off by forcibly stopping the engine.

そこで本発明は、エンジンの経年変化を考慮しながら燃料漏れの発生を確実に検出することができる検出手段を備えたエンジン発電機を提供することを目的としている。   SUMMARY OF THE INVENTION An object of the present invention is to provide an engine generator provided with detection means that can reliably detect the occurrence of fuel leakage while taking into account the secular change of the engine.

上記目的を達成するため、本発明のエンジン発電機は、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、前記燃料送出管を通って燃料タンクからエンジンに送出される燃料の流量を計測する送出流量計と、前記燃料返送管を通ってエンジンから燃料タンクに返送される燃料の流量を計測する返送流量計と、前記発電機の発電電力量を計測する電力量計測手段とを備えるとともに、前記送出流量計の計測値から前記返送流量計の計測値を差し引いたエンジンへの燃料供給量と、前記電力量計測手段で計測した発電電力量に基づいてあらかじめ設定された燃料消費量算出式により算出したエンジンの燃料消費量とを比較し、前記エンジンへの燃料供給量が前記エンジンの燃料消費量に対してあらかじめ設定された量以上になったときに燃料漏れが発生したと判定する判定手段を備え、該判定手段は、前記エンジンの使用期間に基づいて前記燃料消費量算出式を、算出した前記燃料消費量が増加するように補正する燃料消費量算出式補正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, an engine generator according to the present invention includes an engine, a generator driven by the engine, a fuel tank for storing fuel supplied to the engine, and a fuel tank inside the casing. A portable engine generator comprising a fuel delivery pipe for supplying fuel sucked 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 delivery flow meter for measuring the flow rate of fuel sent from the fuel tank to the engine through the fuel delivery pipe, and a return flow meter for measuring the flow rate of fuel returned from the engine to the fuel tank through the fuel return pipe And an electric energy measuring means for measuring the amount of electric power generated by the generator, and from the measured value of the delivery flow meter, the return flow meter The fuel supply amount to the engine from which the measured value is subtracted is compared with the fuel consumption amount of the engine calculated by a fuel consumption calculation formula set in advance based on the power generation amount measured by the power amount measuring means, And determining means for determining that a fuel leak has occurred when a fuel supply amount to the engine is greater than or equal to a predetermined amount with respect to the fuel consumption of the engine, the determining means comprising a period of use of the engine And a fuel consumption calculation formula correcting means for correcting the fuel consumption calculation formula so that the calculated fuel consumption increases.

さらに、本発明の可搬式エンジン発電機は、前記エンジンの使用期間がエンジンを使用開始してからの経過日数あるいは前記燃料消費量算出式を補正してからの経過日数であり、該経過日数があらかじめ設定された設定日数を超えたときに、前記燃料消費量算出式補正手段が前記燃料消費量算出式を補正すること、あるいは、前記エンジンの使用期間がエンジンを使用開始してからの積算運転時間あるいは前記燃料消費量算出式を補正してからの積算運転時間であり、該積算運転時間があらかじめ設定された設定時間を超えたときに、前記燃料消費量算出式補正手段が前記燃料消費量算出式を補正することを特徴としている。   Furthermore, the portable engine generator of the present invention is the number of days that have elapsed since the start of use of the engine, or the number of days that have elapsed since the fuel consumption calculation formula was corrected. When the set number of days set in advance is exceeded, the fuel consumption calculation formula correcting means corrects the fuel consumption calculation formula, or integrated operation after the engine usage period starts using the engine Or an accumulated operation time after correcting the fuel consumption calculation formula, and when the accumulated operation time exceeds a preset set time, the fuel consumption calculation formula correcting means It is characterized by correcting the calculation formula.

また、前記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、前記判定手段が燃料漏れの発生を判定したときに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 addition, the apparatus includes an alarm generation unit that generates an alarm when the determination unit determines occurrence of fuel leakage, and an engine control unit that stops the engine when the determination unit determines occurrence of fuel leakage. It is characterized by having.

本発明のエンジン発電機によれば、発電電力量に基づいて燃料消費量を算出するための燃料消費量算出式を、エンジンの使用期間に応じて補正するので、長期間の使用による経年変化でエンジンの燃費性能が低下し、発電電力量に対して燃料を多く消費するようになった場合でも、燃料漏れが発生したと判定することがなくなり、負荷への電力供給を継続することができる。一方、経年変化を見込んだ以上に燃料供給量が増加した場合は、燃料漏れが発生したと判定するので、燃料が外部に流出したりすることを防止できる。   According to the engine generator of the present invention, the fuel consumption calculation formula for calculating the fuel consumption based on the amount of generated power is corrected according to the period of use of the engine. Even when the fuel consumption performance of the engine is reduced and a large amount of fuel is consumed with respect to the amount of generated power, it is not determined that a fuel leak has occurred, and power supply to the load can be continued. On the other hand, when the fuel supply amount increases more than expected over time, it is determined that a fuel leak has occurred, so that the fuel can be prevented from flowing out.

本発明のエンジン発電機における燃料漏れ検出部の一形態例を示すブロック図である。It is a block diagram which shows one example of the fuel leak detection part in the engine generator of this invention. 発電電力量と燃料消費量との関係、及び、比較する燃料供給量の関係を示す図である。It is a figure which shows the relationship between the electric power generation amount and fuel consumption, and the relationship of the fuel supply amount to compare. 燃料消費量算出式を補正して燃料漏れを検出する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 procedure which correct | amends a fuel consumption calculation formula and detects a fuel leak. 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.

まず、図４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の下方に燃料タンク１５を配置している。   First, as shown in FIG. 4, the portable engine generator shown in this embodiment is configured to drive a generator 12 by 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 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（オイルガード）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 (oil guard) 26 whose bottom and four sides are sealed by a bottom plate 24 and side walls 25 is provided at the lower part 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.

このような可搬式エンジン発電機に設けた燃料漏れ検出部３０は、図１に示すように、前記燃料タンク１５内から燃料フィードポンプ２１で吸引されて燃料送出管２２を通り、エンジン１１に供給される燃料の流量を計測する流量計として送出流量センサ３１と、エンジン１１から燃料返送管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流量計として返送流量センサ３２と、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の発電電力量を計測する電力量センサ３３と、これらのセンサから得られる流量や電力量に基づいて燃料漏れの判定を行う判定部３４とを備えている。   As shown in FIG. 1, the fuel leak detector 30 provided in such a portable engine generator is sucked by the fuel feed pump 21 from the fuel tank 15 and supplied to the engine 11 through the fuel delivery pipe 22. A flow rate sensor 31 as a flow meter for measuring the flow rate of the fuel to be sent, a return flow rate sensor 32 as a flow meter for measuring the flow rate of fuel returned from the engine 11 to the fuel tank 15 through the fuel return pipe 23, and a load A power amount sensor 33 that measures the amount of power generated by the generator 12 from the amount of power supplied, frequency, power factor, etc., and a determination unit that determines fuel leakage based on the flow rate and power amount obtained from these sensors 34.

前記送出流量センサ３１で計測した送出量計測値及び前記返送流量センサ３２で計測した返送量計測値と、前記電力量センサ３３で計測した発電電力量計測値は、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３４に取り込まれる。さらに、判定手段３４には、該判定手段３４が燃料漏れが発生したと判定したときに、判定手段３４からの信号によって作動するエンジン制御手段３５と警報発生手段３６とが接続されている。また、判定手段３４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おり、液位があらかじめ設定された設定液位より上昇したときに、エンジン制御手段３５や警報発生手段３６を作動させるように形成されている。   The delivery amount measurement value measured by the delivery flow sensor 31, the return amount measurement value measured by the return flow sensor 32, and the generated power amount measurement value measured by the electricity amount sensor 33 are used to determine the presence or absence of fuel leakage. The data for calculation is taken into the determination means 34. Further, an engine control means 35 and an alarm generation means 36 that are operated by a signal from the determination means 34 when the determination means 34 determines that fuel leakage has occurred are connected to the determination means 34. In addition, the liquid level detection signals from both liquid level sensors 28 and 29 are also input to the determination unit 34. When the liquid level rises above a preset liquid level, an engine control unit 35 or an alarm is generated. It is configured to actuate the means 36.

一般に、エンジン１１で発電機１２を駆動して発電する場合、エンジン１１が消費する燃料の量は、発電機１２が発電している電力量の二乗に比例することがわかっているため、前記判定手段３４には、エンジン１１と発電機１２との組み合わせに応じて、発電電力量計測値からエンジン１１の燃料消費量を算出するための燃料消費量算出式があらかじめ設定されている。電力量センサ３３で計測した発電電力量計測値に基づいて燃料消費量算出式で算出した値から、図２（ａ）に示すような燃料消費基準線Ａを描くことができる。   In general, when the generator 11 is driven by the engine 11 to generate power, it is known that the amount of fuel consumed by the engine 11 is proportional to the square of the amount of power generated by the generator 12. The means 34 is preset with a fuel consumption calculation formula for calculating the fuel consumption of the engine 11 from the measured value of the generated power according to the combination of the engine 11 and the generator 12. A fuel consumption reference line A as shown in FIG. 2A can be drawn from the value calculated by the fuel consumption amount calculation formula based on the generated power amount measurement value measured by the power amount sensor 33.

判定手段３４による燃料漏れの判定は、基本的には、前記送出流量センサ３１の送出量計測値から前記返送流量センサ３２の返送量計測値を差し引いた燃料供給量算出値と、前記電力量センサ３３で計測した発電電力量計測値から算出した負荷率に基づいて燃料消費量算出式により算出した燃料消費量との比較で行われ、燃料消費量に対して燃料供給量算出値があらかじめ設定された量以上になったとき、例えば、燃料消費量算出式で算出した燃料消費量に対して燃料供給量算出値が１％以上多くなったときに、燃料漏れが発生したと判定する。判定手段３４は、燃料漏れを検出するとエンジン制御手段３５でエンジン１１を自動的に停止させたり、警報発生手段３６で警報や警告灯を作動させたりする。また、判定手段３４には、各流量センサ３１，３２や電力量センサ３３の異常発生を検出する機能も備えており、例えば、各センサからの信号が途絶えたときには、センサに異常が発生したと判定し、エンジン制御手段３５でエンジン１１を停止させたり、警報発生手段３６で警報や警告灯を作動させたりする。   The determination of the fuel leakage by the determination means 34 is basically performed by calculating the fuel supply amount obtained by subtracting the return amount measurement value of the return flow rate sensor 32 from the delivery amount measurement value of the delivery flow rate sensor 31 and the power amount sensor. This is performed by comparison with the fuel consumption calculated by the fuel consumption calculation formula based on the load factor calculated from the measured power generation value measured in 33, and the fuel supply calculation value is set in advance for the fuel consumption. When the fuel supply amount calculation value is 1% or more greater than the fuel consumption calculated by the fuel consumption calculation formula, for example, it is determined that the fuel leakage has occurred. When the fuel leak is detected, the determination unit 34 automatically stops the engine 11 by the engine control unit 35 or activates an alarm or warning light by the alarm generation unit 36. The determination means 34 also has a function of detecting the occurrence of an abnormality in each of the flow sensors 31, 32 and the electric energy sensor 33. For example, when the signal from each sensor is interrupted, an abnormality has occurred in the sensor. The engine control unit 35 stops the engine 11 and the alarm generation unit 36 activates an alarm or warning light.

長期間の使用による経年変化でエンジン１１の燃費性能が低下した場合、図２（ａ）に示すように、流量センサ３１，３２の計測値から算出した燃料供給量算出値Ｂの燃料量が、前記燃料消費基準線Ａの燃料量よりも多くなる。例えば、初期設定された燃料消費量算出式では、燃料消費基準線Ａに対して燃料供給量算出値Ｂが大きくなるため、判定手段３４が燃料漏れが発生していると判定してしまう。   When the fuel consumption performance of the engine 11 decreases due to secular change due to long-term use, as shown in FIG. 2A, the fuel amount of the fuel supply amount calculation value B calculated from the measurement values of the flow sensors 31, 32 is The amount of fuel exceeds the fuel consumption reference line A. For example, in the fuel consumption calculation formula that is initially set, the fuel supply amount calculation value B is larger than the fuel consumption reference line A, so that the determination unit 34 determines that fuel leakage has occurred.

このため、前記判定手段３４には、エンジン１１の使用期間に応じて前記燃料消費量算出式を補正する燃料消費量算出式補正手段３７が設けられている。この燃料消費量算出式補正手段３７は、このエンジン発電機の使用開始からの経過日数、あるいは、燃料消費量算出式補正手段３７で燃料消費量算出式を補正してからの経過日数があらかじめ設定された経過日数を超えたときに、前回の運転で記録した経年負荷率と経年燃料供給量との記録に基づいて、前記燃料消費量算出式をあらかじめ設定された条件で補正するための燃料消費量補正式を算出し、算出した燃料消費量補正式により、算出される燃料消費量が増加するように燃料消費量算出式を補正する。   Therefore, the determination unit 34 is provided with a fuel consumption calculation formula correcting unit 37 that corrects the fuel consumption calculation formula in accordance with the usage period of the engine 11. The fuel consumption calculation formula correcting means 37 sets in advance the number of days that have elapsed since the start of use of the engine generator, or the number of days that have elapsed since the fuel consumption calculation formula correcting means 37 corrected the fuel consumption calculation formula. The fuel consumption for correcting the fuel consumption calculation formula under a preset condition based on the record of the aged load factor and the aged fuel supply amount recorded in the previous operation when the number of elapsed days exceeded An amount correction formula is calculated, and the fuel consumption calculation formula is corrected by the calculated fuel consumption correction formula so that the calculated fuel consumption increases.

例えば、半年以上経過し、前記燃料消費基準線Ａに対して燃料供給量算出値Ｂが常に０．２％以上上回る値になるようになった場合には、燃料消費基準線Ａを作成する燃料消費量算出式を、燃料消費量補正式によって燃料消費量算出式で算出する燃料消費量が０．２％大きな値となるように補正する。これにより、図２（ｂ）に示すように、燃料消費量算出式で算出した燃料消費量により描かれる燃料消費基準線が、実線で示す前記燃料消費基準線Ａから破線で示す新たな燃料消費基準線Ｃになる。   For example, when a fuel supply amount calculation value B always exceeds 0.2% or more with respect to the fuel consumption reference line A after half a year has elapsed, the fuel for creating the fuel consumption reference line A The consumption calculation formula is corrected by the fuel consumption correction formula so that the fuel consumption calculated by the fuel consumption calculation formula becomes a value 0.2% larger. As a result, as shown in FIG. 2B, the fuel consumption reference line drawn by the fuel consumption calculated by the fuel consumption calculation formula is changed from the fuel consumption reference line A indicated by the solid line to the new fuel consumption indicated by the broken line. It becomes the reference line C.

このように、以前の燃料消費基準線Ａの値に比べて燃料量が多くなる新たな燃料消費基準線Ｃを描くように燃料消費量算出式を補正することにより、エンジン１１の燃費性能が経年変化により低下して、前述のように、燃料消費基準線Ａに対して燃料供給量算出値Ｂが１％多くなった場合でも、新たな燃料消費基準線Ｃと燃料供給量算出値Ｂとを比較するので、判定手段３４が燃料漏れ発生と判定することはなく、そのまま電力供給を継続することができる。この場合も、新たな燃料消費基準線Ｃの値に対して燃料供給量算出値Ｂがあらかじめ設定された値以上に大きくなった場合には燃料漏れと判定するので、燃料漏れの発生を見逃すことはない。   Thus, by correcting the fuel consumption calculation formula so as to draw a new fuel consumption reference line C in which the amount of fuel is larger than the value of the previous fuel consumption reference line A, the fuel consumption performance of the engine 11 is improved over time. Even if the fuel supply amount calculated value B increases by 1% with respect to the fuel consumption reference line A as described above, the new fuel consumption reference line C and the fuel supply amount calculated value B are Since the comparison is made, the determination means 34 does not determine that the fuel leak has occurred, and the power supply can be continued as it is. Also in this case, when the fuel supply amount calculation value B becomes larger than a preset value with respect to the value of the new fuel consumption reference line C, it is determined that the fuel leaks, so that the occurrence of the fuel leak is overlooked. There is no.

次に、図３に基づいて、判定手段３４で前記燃料消費量算出式を補正しながら燃料漏れを検出する動作の一例を説明する。ステップ１０１で可搬式エンジン発電機の電源を投入し、エンジン１１をスタートさせて発電機１２が発電を開始すると、ステップ１０２で、前回の運転で保存した経年負荷率、経年燃料供給量、日付などの記録を読み出して燃料消費量補正式を算出する。なお、燃料消費量算出式、燃料消費量補正式は、あらかじめ設定された式が製造時に初期値としてそれぞれ記録されており、製造後に初めて運転する場合は、初期値を読み出すことになり、日付は当日の日付を使用開始日として読み出すことになる。   Next, an example of an operation for detecting a fuel leak while correcting the fuel consumption calculation formula by the determination means 34 will be described with reference to FIG. When the power of the portable engine generator is turned on in step 101 and the engine 11 is started and the generator 12 starts generating power, in step 102, the aging load factor, the aging fuel supply amount, the date, etc. stored in the previous operation are stored. The fuel consumption correction formula is calculated by reading the record. Note that the fuel consumption calculation formula and the fuel consumption correction formula are pre-set formulas that are recorded as initial values at the time of manufacture, respectively. The date of the day will be read out as the use start date.

次のステップ１０３では、可搬式エンジン発電機の使用開始日あるいは燃料消費量算出式を補正した前回の日付から経過した期間を算出し、あらかじめ設定された期間、例えば半年を経過したか否かを判断する。ステップ１０３で半年以上経過していると判断したときは、ステップ１０４に進み、あらかじめ設定されている経年負荷率及び経年燃料供給量の記録を読み出し、経年負荷率及び経年燃料供給量と読み出した燃料消費量算出式とに基づいて新たな燃料消費量算出式を算出する。次に、ステップ１０５では、算出した新たな燃料消費量算出式と読み出した以前の燃料消費量算出式とを比較し、両者の誤差があらかじめ設定された量未満、例えば誤差が１％未満のときには、ステップ１０６で以前の燃料消費量算出式を新たな燃料消費量算出式に補正してステップ１０７に進む。一方、ステップ１０５で両者の誤差が１％以上であると判断したときには、誤差が大きすぎて不適切なため、ステップ１０６に進まずに、以前の燃料消費量算出式を保持した状態でステップ１０７に進む。また、前記ステップ１０３で経過した期間があらかじめ設定された期間未満のときにもステップ１０７に進む。   In the next step 103, a period elapsed from the date when the portable engine generator was used or the fuel consumption calculation formula was corrected is calculated, and whether or not a preset period, for example, half a year has passed, is calculated. to decide. If it is determined in step 103 that more than half a year has passed, the process proceeds to step 104, where a record of the preset aging load factor and aging fuel supply amount is read, and the aging load factor and aging fuel supply amount and the read fuel are read. A new fuel consumption calculation formula is calculated based on the consumption calculation formula. Next, in step 105, the calculated new fuel consumption calculation formula is compared with the previous fuel consumption calculation formula that has been read, and when the error between the two is less than a preset amount, for example, the error is less than 1%. In step 106, the previous fuel consumption calculation formula is corrected to a new fuel consumption calculation formula, and the routine proceeds to step 107. On the other hand, when it is determined in step 105 that the error between the two is 1% or more, the error is too large and inappropriate. Therefore, the process does not proceed to step 106, but the previous fuel consumption calculation formula is held and step 107 is held. Proceed to Further, the routine also proceeds to step 107 when the period elapsed in step 103 is less than a preset period.

ステップ１０７では、送出流量センサ３１と返送流量センサ３２とで燃料流量をそれぞれ計測し、次のステップ１０８では、計測した各燃料流量から、判定の対象とするための燃料供給量（燃料供給量算出値）を算出する。また、ステップ１０９で電力量センサ３３により発電電力量を計測し、ステップ１１０で発電電力量から負荷率を算出する。   In step 107, the fuel flow rate is measured by the delivery flow rate sensor 31 and the return flow rate sensor 32, respectively, and in the next step 108, the fuel supply amount (fuel supply amount calculation) to be determined from each measured fuel flow rate. Value). In step 109, the amount of generated power is measured by the power amount sensor 33, and in step 110, the load factor is calculated from the amount of generated power.

次のステップ１１１では、送出流量センサ３１及び返送流量センサ３２の異常の有無の判定、ステップ１０８で算出した燃料供給量算出値と、ステップ１１０で算出した負荷率に基づいて燃料消費量算出式で算出した燃料消費量との比較によって燃料漏れの有無の判定を行う。ステップ１１１で両流量センサ３１，３２の異常や燃料漏れがないと判断したときには、ステップ１１２に進んで電力量センサ３３の異常の有無の判定を行い、電力量センサ３３に異常がないと判断した場合は、ステップ１１３に進み、判定に用いた負荷率や燃料供給量を、経年負荷率及び経年燃料供給量として記録し、ステップ１１４に進む。   In the next step 111, a determination is made on whether there is an abnormality in the delivery flow rate sensor 31 and the return flow rate sensor 32, a fuel supply amount calculation value calculated in step 108, and a fuel consumption amount calculation formula based on the load factor calculated in step 110 The presence or absence of fuel leakage is determined by comparison with the calculated fuel consumption. When it is determined in step 111 that there is no abnormality in both the flow sensors 31 and 32 and there is no fuel leakage, the process proceeds to step 112 to determine whether or not the electric energy sensor 33 is abnormal, and it is determined that there is no abnormality in the electric energy sensor 33. In this case, the process proceeds to step 113, and the load factor and fuel supply amount used for the determination are recorded as the aged load factor and the aged fuel supply amount, and the process proceeds to step 114.

前記ステップ１１１，１１２でセンサの異常や燃料漏れの発生を検知したときには、従来と同様に、エンジン制御手段３５や警報発生手段３６を作動させ、自動的あるいは手動でエンジン１１を停止させてステップ１１４に進む。 When an abnormality of the sensor or the occurrence of fuel leakage is detected in the steps 111 and 112, the engine control means 35 and the alarm generation means 36 are actuated to stop the engine 11 automatically or manually as in the conventional case. Proceed to

ステップ１１４では、電源が切られていなければ前記ステップ１０７に戻り、ステップ１０７〜ステップ１１４を繰り返し、ステップ１１４で電源が切断されたと判断したときには、ステップ１１５で運転中に記録した負荷率、燃料供給量などの各種データや各種式、日付などを保存して終了する。   In Step 114, if the power is not turned off, the process returns to Step 107, and Steps 107 to 114 are repeated. When it is determined in Step 114 that the power is turned off, the load factor and fuel supply recorded during the operation in Step 115 are obtained. Save various data such as quantity, various formulas, date, etc. and exit.

このように、可搬式エンジン発電機のエンジン１１や発電機１２の経年変化を考慮して燃料漏れの有無の判定を行うことにより、エンジン１１の経年変化による燃料消費の増加を、燃料漏れと判定することがなくなり、長期にわたって安定した状態で電力供給を行えるとともに、燃料漏れの判定を確実に行うことができる。   Thus, by determining the presence or absence of fuel leakage in consideration of the secular change of the engine 11 or the generator 12 of the portable engine generator, the increase in fuel consumption due to the secular change of the engine 11 is determined as the fuel leak. This makes it possible to supply power in a stable state over a long period of time, and to reliably determine fuel leakage.

なお、使用期間は、エンジンの積算運転時間を利用することもでき、経過日数と積算運転時間とを併用することもできる。   It should be noted that the accumulated operation time of the engine can be used for the use period, and the elapsed days and the accumulated operation time can be used in combination.

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、３０…燃料漏れ検出部、３１…送出流量センサ、３２…返送流量センサ、３３…電力量センサ、３４…判定部、３５…エンジン制御手段、３６…警報発生手段、３７…燃料消費量算出式補正手段   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, 30 ... Fuel leak detection part 31 ... Sending flow rate sensor, 32 ... Return flow rate sensor, 33 ... Electric energy sensor, 34 ... Determination unit, 35 ... Engine control means, 36 ... Alarm generating means, 37 ... Fuel consumption calculation formula correcting means

Claims (5)

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、前記燃料送出管を通って燃料タンクからエンジンに送出される燃料の流量を計測する送出流量計と、前記燃料返送管を通ってエンジンから燃料タンクに返送される燃料の流量を計測する返送流量計と、前記発電機の発電電力量を計測する電力量計測手段とを備えるとともに、前記送出流量計の計測値から前記返送流量計の計測値を差し引いたエンジンへの燃料供給量と、前記電力量計測手段で計測した発電電力量に基づいてあらかじめ設定された燃料消費量算出式により算出したエンジンの燃料消費量とを比較し、前記エンジンへの燃料供給量が前記エンジンの燃料消費量に対してあらかじめ設定された量以上になったときに燃料漏れが発生したと判定する判定手段を備え、該判定手段は、前記エンジンの使用期間に基づいて前記燃料消費量算出式を、算出した前記燃料消費量が増加するように補正する燃料消費量算出式補正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。   Inside the casing, an engine, a generator driven by the engine, a fuel tank for storing fuel to be supplied to the engine, and fuel for supplying fuel sucked from the fuel tank by a fuel feed pump to the engine In a portable engine generator having a delivery pipe and a fuel return pipe for returning fuel not consumed in the engine from the engine to the fuel tank, the fuel is sent from the fuel tank to the engine through the fuel delivery pipe. A delivery flow meter that measures the flow rate of fuel, a return flow meter that measures the flow rate of fuel returned from the engine to the fuel tank through the fuel return pipe, and an energy measurement that measures the amount of power generated by the generator A fuel supply amount to the engine obtained by subtracting the measurement value of the return flow meter from the measurement value of the delivery flow meter; The fuel consumption of the engine calculated by a fuel consumption calculation formula set in advance based on the power generation amount measured by the amount measuring means is compared with the fuel consumption of the engine relative to the fuel consumption of the engine. Determining means for determining that a fuel leak has occurred when the fuel consumption amount exceeds a preset amount, and the determining means calculates the fuel consumption calculation formula based on a period of use of the engine. A portable engine generator comprising fuel consumption calculation formula correcting means for correcting the consumption to increase. 前記エンジンの使用期間は、エンジンを使用開始してからの経過日数あるいは前記燃料消費量算出式を補正してからの経過日数であり、該経過日数があらかじめ設定された設定日数を超えたときに、前記燃料消費量算出式補正手段が前記燃料消費量算出式を補正す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 period of use of the engine is the number of days that have elapsed since the start of use of the engine or the number of days that have elapsed since the fuel consumption calculation formula was corrected, and when the number of days that have elapsed exceeds a preset number of days 2. The portable engine generator according to claim 1, wherein the fuel consumption calculation formula correcting means corrects the fuel consumption calculation formula. 前記エンジンの使用期間は、エンジンを使用開始してからの積算運転時間あるいは前記燃料消費量算出式を補正してからの積算運転時間であり、該積算運転時間があらかじめ設定された設定時間を超えたときに、前記燃料消費量算出式補正手段が前記燃料消費量算出式を補正す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 period of use of the engine is an accumulated operation time after the start of use of the engine or an accumulated operation time after correcting the fuel consumption calculation formula, and the accumulated operation time exceeds a preset set time. 2. The portable engine generator according to claim 1, wherein the fuel consumption calculation formula correcting means corrects the fuel consumption calculation formula. 前記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請求項１乃至３のいずれか１項記載の可搬式エンジン発電機。   The portable engine generator according to any one of claims 1 to 3, further comprising alarm generation means for generating an alarm when the determination means determines occurrence of fuel leakage. 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乃至４のいずれか１項記載の可搬式エンジン発電機。   5. The portable engine generator according to claim 1, further comprising an engine control unit that stops the engine when the determination unit determines occurrence of fuel leakage. 6.
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