JP2008281109A - Liquefied gas filling device and liquefied gas filling method - Google Patents

Liquefied gas filling device and liquefied gas filling method Download PDF

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JP2008281109A
JP2008281109A JP2007125695A JP2007125695A JP2008281109A JP 2008281109 A JP2008281109 A JP 2008281109A JP 2007125695 A JP2007125695 A JP 2007125695A JP 2007125695 A JP2007125695 A JP 2007125695A JP 2008281109 A JP2008281109 A JP 2008281109A
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liquefied gas
filling
pressure
tank
storage container
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JP4950754B2 (en
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Teruo Kasuya
晃夫 粕谷
太 ▲高▼橋
Futoshi Takahashi
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Tokico System Solutions Co Ltd
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Tokico Technology Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquefied gas filling device and a liquefied gas filling method, capable of accurately measuring a gas filling quantity filled in a filling tank. <P>SOLUTION: An equalizing valve 8 closed from the initial stage of filling, is not opened when a pressure difference in both vessels (pressure Pt in a storage vessel - pressure Ps in a vehicle vessel) is a value exceeding predetermined pressure PO. If the equalizing valve 8 is opened when the pressure Pt in the storage vessel is higher than the pressure Ps in the vehicle vessel, though these is risk of becoming the situation of unnecessarily supplying liquefied gas to the vehicle vessel by passing through a gaseous phase line (an equalizing line), such a situation is not caused by the control, and reduction in measuring accuracy of a liquefied gas filling quantity caused by supplying the liquefied gas to the vehicle vessel 2 by passing through the gaseous phase line 7, is not caused, and the measuring accuracy is improved by that extent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は液化ＤＭＥ（ジメチルエーテル）、ＬＰＧ（液化プロパンガス）、ＬＮＧ（液化天然ガス）などの液化ガスを貯蔵容器から被充填タンクに充填する場合に用いられる液化ガス充填装置及び液化ガス充填方法に関する。   The present invention relates to a liquefied gas filling apparatus and a liquefied gas filling method used when filling a tank to be filled with liquefied gas such as liquefied DME (dimethyl ether), LPG (liquefied propane gas), and LNG (liquefied natural gas) from a storage container. .

近年、液化ガスを燃料にして走行する自動車の開発が進められており、これに伴い液化ガスをスタンドの貯蔵タンク（貯蔵容器）から自動車の燃料タンク（被充填タンク）に供給して充填させる液化ガス充填装置の実用化が進められている。
本発明は、液化ガスを貯蔵タンクから被充填タンクに充填する液化ガス充填装置及び液化ガス充填方法に関するものであるが、バルクローリー車に載置されたタンク（ローリータンク）からバルク容器に液化石油ガスを充填する、すなわち、本発明に係る液化ガス充填装置と液化ガス（液化石油ガス）の流れが反対の場合となる液化石油ガス充填装置の一例が、特許文献１に示されている。 In recent years, the development of automobiles that run on liquefied gas as fuel has been promoted, and accordingly, liquefied gas is supplied from the storage tank (storage container) of the stand to the fuel tank (filled tank) of the automobile for filling. Practical use of gas filling equipment is in progress.
The present invention relates to a liquefied gas filling apparatus and a liquefied gas filling method for filling liquefied gas from a storage tank to a tank to be filled, and liquefied petroleum from a tank (lorry tank) mounted on a bulk lorry vehicle to a bulk container. Patent Document 1 discloses an example of a liquefied petroleum gas filling device that fills gas, that is, a liquefied gas filling device according to the present invention and a liquefied gas (liquefied petroleum gas) flow are opposite to each other.

特許文献１の液化石油ガス充填装置は、バルクローリー車のローリータンクの下部とバルク容器との間にはポンプを介して液送ライン（液化ガス供給経路）が連結され、ローリータンクの上部とバルク容器との間に気相ライン（均圧ライン）が連結され、ポンプの駆動により液化石油ガスをバルク容器内に充填するようになっている。   In the liquefied petroleum gas filling device of Patent Document 1, a liquid feed line (liquefied gas supply path) is connected between a lower part of a lorry tank of a bulk lorry vehicle and a bulk container via a pump, and an upper part of the lorry tank and a bulk A gas phase line (equal pressure equalization line) is connected to the container, and liquefied petroleum gas is filled into the bulk container by driving a pump.

そして、特許文献１の液化石油ガス充填装置におけるローリータンクからバルク容器への液化石油ガス（液化ガス）の充填に代えて、バルク容器からローリータンクへ液化ガスを充填するようにし、すなわち、貯蔵タンクから被充填タンクへ液化ガスを充填するようにして本願発明が対象にする液化ガス充填装置（以下、便宜上、特許文献１参考技術という。）を構成することが考えられる。
特開２０００-２９１８８９号公報 And instead of filling the liquefied petroleum gas (liquefied gas) from the lorry tank to the bulk container in the liquefied petroleum gas filling device of Patent Document 1, the liquefied gas is filled from the bulk container to the lorry tank, that is, a storage tank. It is conceivable to construct a liquefied gas filling apparatus (hereinafter referred to as “Reference technology of Patent Document 1” for the sake of convenience) that the present invention is intended to fill the tank to be filled with liquefied gas.
JP 2000-291889 A

ところで、上述した特許文献１参考技術では、貯蔵タンク内の圧力が被充填タンク内の圧力よりも高い場合には、気化ガスが均圧ラインを介して被充填タンクに供給されてしまう。この現象は、貯蔵タンク内の圧力が被充填タンク内の圧力より大きければ大きい程顕著に現われ、この結果、被充填タンクへの正確なガス充填量を把握することができなくなるという問題点を惹起する。   By the way, in the above-mentioned Patent Document 1 reference technique, when the pressure in the storage tank is higher than the pressure in the tank to be filled, the vaporized gas is supplied to the tank to be filled through the pressure equalization line. This phenomenon appears more prominently when the pressure in the storage tank is larger than the pressure in the tank to be filled. As a result, it becomes impossible to grasp the exact gas filling amount to the tank to be filled. To do.

本発明は、上記事情に鑑みてなされたもので、被充填タンクに充填されるガス充填量の正確な計測を可能とする液化ガス充填装置及び液化ガス充填方法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 liquefied gas filling apparatus and a liquefied gas filling method capable of accurately measuring the amount of gas filled in a tank to be filled.

請求項１記載の発明は、液化ガスの貯蔵容器及び被充填タンクを接続する液化ガス供給経路と、前記貯蔵容器から前記被充填タンクへの液化ガスの充填制御を行うコントローラと、を備えた液化ガス充填装置において、前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインと、該均圧ラインに設けられ前記コントローラの制御により開、閉弁して該均圧ラインの連通、遮断を行い液化ガス充填開始時には閉弁されている均圧弁と、前記貯蔵容器内の圧力を検出する貯蔵容器内圧力検出手段と、前記被充填タンク内の圧力を検出する被充填タンク内圧力検出手段と、を備え、前記コントローラは、前記貯蔵容器内圧力検出手段が検出する貯蔵容器内圧力が前記被充填タンク内圧力検出手段が検出する被充填タンク内圧力よりも所定圧力以上大きい場合には前記均圧弁を開弁させないことを特徴とする。   The invention according to claim 1 is a liquefaction comprising: a liquefied gas supply path that connects a storage container for liquefied gas and a tank to be filled; and a controller that controls filling of the liquefied gas from the storage container to the tank to be filled. In the gas filling device, a pressure equalization line connecting the gas phase part of the storage container and the gas phase part of the tank to be filled, and the pressure equalization line provided in the pressure equalization line is opened and closed under the control of the controller, and the pressure equalization A pressure equalizing valve which is closed at the start of liquefied gas filling by connecting and shutting off the line, a pressure detecting means in the storage container for detecting the pressure in the storage container, and a filling to detect the pressure in the filling tank A tank internal pressure detection means, wherein the controller is configured such that the storage container internal pressure detected by the storage container internal pressure detection means is equal to the filling tank internal pressure detected by the filling tank internal pressure detection means. If more than a predetermined pressure greater, characterized in that does not open the pressure equalizing valve.

請求項２記載の発明は、液化ガスの貯蔵容器及び被充填タンクを接続する液化ガス供給経路と、前記貯蔵容器から前記被充填タンクへの液化ガスの充填制御を行うコントローラと、を備えた液化ガス充填装置において、前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインと、該均圧ラインに設けられ前記コントローラの制御により開、閉弁して該均圧ラインの連通、遮断を行い液化ガス充填開始時には閉弁されている均圧弁と、前記液化ガスの前記被充填タンクへの充填の終了が近いことを検出する液化ガス充填末期検出手段と、を備え、前記コントローラは、前記液化ガス供給終了検出手段の検出結果に基づき前記均圧弁を開弁させることを特徴とする。
請求項３記載の発明は、請求項２に記載の液化ガス充填装置において、前記液化ガス供給終了検出手段は、前記貯蔵容器から前記被充填タンクへの液化ガスの供給量を計測する流量計により得られた計測流量が予め定めた所定流量以下に低下した場合に、前記液化ガスの前記被充填タンクへの充填の終了が近いことを検出することを特徴とする。 The invention according to claim 2 is a liquefaction comprising a liquefied gas supply path connecting a storage container for a liquefied gas and a tank to be filled, and a controller for controlling filling of the liquefied gas from the storage container to the tank to be filled. In the gas filling device, a pressure equalization line connecting the gas phase part of the storage container and the gas phase part of the tank to be filled, and the pressure equalization line provided in the pressure equalization line is opened and closed under the control of the controller, and the pressure equalization A pressure equalizing valve that is closed at the start of liquefied gas filling by connecting and shutting off the line, and liquefied gas filling end detection means for detecting that the filling of the liquefied gas into the tank to be filled is nearing completion The controller opens the pressure equalizing valve based on a detection result of the liquefied gas supply end detection means.
According to a third aspect of the present invention, in the liquefied gas filling device according to the second aspect, the liquefied gas supply completion detecting means is a flow meter that measures the supply amount of the liquefied gas from the storage container to the tank to be filled. When the obtained measured flow rate falls below a predetermined flow rate determined in advance, it is detected that the filling of the liquefied gas into the filling tank is almost finished.

請求項４記載の発明は、貯蔵容器及び被充填タンクを接続する液化ガス供給経路を通して前記貯蔵容器より前記被充填タンクへ液化ガスを充填する液化ガス充填方法において、前記貯蔵容器内の圧力及び前記被充填タンク内の圧力を検出する圧力検出工程を有し、前記圧力検出工程で得られた前記貯蔵容器内の圧力が前記圧力検出工程で得られた前記被充填タンク内の圧力よりも所定圧力以上大きい場合には、前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインに設けられ液化ガス充填開始時には閉弁されている均圧弁を開弁しないことを特徴とする。   According to a fourth aspect of the present invention, there is provided a liquefied gas filling method for filling a liquefied gas from the storage container to the tank to be filled through a liquefied gas supply path connecting the storage container and the tank to be filled. A pressure detection step for detecting the pressure in the filling tank, and the pressure in the storage container obtained in the pressure detection step is a predetermined pressure higher than the pressure in the filling tank obtained in the pressure detection step. If larger than the above, the pressure equalizing valve provided at the pressure equalizing line connecting the gas phase portion of the storage container and the gas phase portion of the tank to be filled is not opened when liquefied gas filling is started. And

請求項５記載の発明は、貯蔵容器及び被充填タンクを接続する液化ガス供給経路を通して前記貯蔵容器より前記被充填タンクへ液化ガスを充填する液化ガス充填方法において、前記液化ガスの充填の終了が近いことが検出された場合、前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインに設けられ液化ガス充填開始時には閉弁されている均圧弁を開弁させることを特徴とする。
請求項６記載の発明は、請求項５に記載の液化ガス充填方法において、前記貯蔵容器から前記被充填タンクへの液化ガスの供給量を計測する流量計により得られた計測流量が予め定めた所定流量以下に低下した場合に、前記液化ガスの充填の終了が近いと検出されることを特徴とする。 According to a fifth aspect of the present invention, in the liquefied gas filling method of filling the liquefied gas from the storage container to the tank to be filled through the liquefied gas supply path connecting the storage container and the tank to be filled, the filling of the liquefied gas is completed. When it is detected that the tank is close, the pressure equalizing valve provided at the pressure equalizing line connecting the gas phase part of the storage container and the gas phase part of the tank to be filled is closed when liquefied gas filling starts. It is characterized by.
According to a sixth aspect of the present invention, in the liquefied gas filling method according to the fifth aspect, a measurement flow rate obtained by a flow meter for measuring a supply amount of the liquefied gas from the storage container to the tank to be filled is predetermined. When the flow rate drops below a predetermined flow rate, it is detected that the end of filling of the liquefied gas is near.

請求項１、４に記載の発明によれば、液化ガス充填開始時から閉弁されている均圧弁について貯蔵容器内圧力が被充填タンク内圧力よりも所定圧力以上大きい場合には均圧弁を開弁させないので、貯蔵容器内圧力が被充填タンク内圧力より大きい場合に、仮に均圧弁が開弁していると、均圧ラインを通って液化ガスが被充填タンクに不要に供給されるような事態になる虞があるが、上記制御によりこのような事態になることがなくなり、均圧ラインを通って被充填タンクに液化ガスが供給されてしまうことで惹起する液化ガス充填量の計測精度の低下を招くことがなく、この分、計測精度の向上が図れる。
請求項２，３，５，６に記載の発明によれば、液化ガス充填開始時には閉弁されている均圧弁が、液化ガスの充填の終了が近いことが検出された場合に、開弁するので、開弁することにより、貯蔵容器の気相部及び被充填タンクの気相部の均圧化が進んで、液化ガスの充填が促進されると共に、開弁されるまでの閉弁状態では、貯蔵容器内圧力が被充填タンク内圧力より大きい場合に、仮に均圧弁が開弁していると、均圧ラインを通って液化ガスが被充填タンクに不要に供給されるような事態になる虞があるが、このような事態になることが回避され、これに伴い液化ガス充填量の計測精度の向上を図ることができる。 According to the first and fourth aspects of the present invention, when the pressure inside the storage container is higher than the pressure inside the tank to be filled by a pressure equalizing valve that has been closed since the start of liquefied gas filling, the pressure equalizing valve is opened. If the pressure in the storage container is higher than the pressure in the tank to be filled and the pressure equalizing valve is opened, the liquefied gas is unnecessarily supplied to the tank to be filled through the pressure equalization line. Although there is a risk of such a situation, such a situation is not caused by the above control, and the measurement accuracy of the liquefied gas filling amount caused by the liquefied gas being supplied to the filled tank through the pressure equalizing line is improved. Measurement accuracy can be improved by this amount without causing a decrease.
According to the second, third, fifth, and sixth aspects of the invention, the pressure equalizing valve that is closed when the liquefied gas filling starts is opened when it is detected that the filling of the liquefied gas is almost finished. Therefore, by opening the valve, the pressure equalization of the gas phase part of the storage container and the gas phase part of the tank to be filled advances, and the filling of the liquefied gas is promoted, and in the closed state until the valve is opened. When the pressure inside the storage container is larger than the pressure inside the tank to be filled and the pressure equalizing valve is opened, the liquefied gas is unnecessarily supplied to the tank to be filled through the pressure equalizing line. Although there is a possibility, such a situation is avoided, and accordingly, the measurement accuracy of the liquefied gas filling amount can be improved.

次に、本発明の第１実施形態に係る液化ガス充填装置についてその液化ガス充填方法と共に図１及び図２に基づいて説明する。
図１は本発明の第１実施形態に係る液化ガス充填装置１を示すシステム系統図である。図１に示されるように、液化ガス充填装置１は、車両に搭載された容器（以下、車両容器２という。被充填タンクに相当する。）に液化ガスを供給するガス供給ステーションなどに設置されている。 Next, the liquefied gas filling apparatus according to the first embodiment of the present invention will be described based on FIGS. 1 and 2 together with the liquefied gas filling method.
FIG. 1 is a system diagram showing a liquefied gas filling apparatus 1 according to the first embodiment of the present invention. As shown in FIG. 1, the liquefied gas filling device 1 is installed in a gas supply station that supplies liquefied gas to a container (hereinafter referred to as a vehicle container 2, which corresponds to a tank to be filled) mounted on a vehicle. ing.

液化ガス充填装置１は、液化ガスを貯蔵する貯蔵容器３からの液化ガスを車両容器２（被充填タンクに相当する。）に供給するためのディスペンサユニット４と、ディスペンサユニット４の各機器を制御するコントローラ５と、から大略、構成されている。
ディスペンサユニット４には、貯蔵容器３の下部側に連通された液相ライン６（ガス供給経路）と、貯蔵容器３の気相部に相当する上部側に連通された気相ライン（均圧ライン）７とが設けられている。気相ライン７には、開、閉弁することにより該気相ライン７の連通、遮断を行う均圧弁（均圧ライン自動弁ともいう。）８が設けられている。均圧弁８はコントローラ５により、開、閉弁制御される。なお、均圧弁８は、少なくとも、充填開始時には閉弁されている。 The liquefied gas filling device 1 controls the dispenser unit 4 for supplying the liquefied gas from the storage container 3 for storing the liquefied gas to the vehicle container 2 (corresponding to a tank to be filled), and each device of the dispenser unit 4. The controller 5 is configured roughly.
The dispenser unit 4 has a liquid phase line 6 (gas supply path) communicated with the lower side of the storage container 3 and a gas phase line (equal pressure line) communicated with the upper side corresponding to the gas phase part of the storage container 3. ) 7 is provided. The gas phase line 7 is provided with a pressure equalizing valve (also referred to as a pressure equalizing line automatic valve) 8 that opens and closes the gas line 7 to open and close the gas phase line 7. The pressure equalizing valve 8 is controlled to open and close by the controller 5. The pressure equalizing valve 8 is closed at least at the start of filling.

液相ライン６には、ポンプ１１、セパレータ１２、逆止弁１３、液相ライン６内を流通する液化ガスの流量を計測するための流量計（以下、供給側流量計という。）１４、背圧弁１５、電磁弁（充填用電磁弁ともいう。）１６が貯蔵容器３から下流側に向けてこの順で配設されている。液相ライン６における背圧弁１５及び電磁弁１６の間の部分に分岐ライン１７が設けられており、分岐ライン１７の先端側には圧力計１８が設けられている。
液相ライン６の下流には、カップリング２０を介して充填ホース２１が接続されている。そして、充填ホース２１の先端には、車両容器２の図示しない充填口に連結される充填ノズル２２が設けられている。 The liquid phase line 6 includes a pump 11, a separator 12, a check valve 13, a flow meter (hereinafter referred to as a supply-side flow meter) 14 for measuring the flow rate of the liquefied gas flowing through the liquid phase line 6, and a back. A pressure valve 15 and a solenoid valve (also referred to as a filling solenoid valve) 16 are arranged in this order from the storage container 3 toward the downstream side. A branch line 17 is provided in a portion of the liquid phase line 6 between the back pressure valve 15 and the electromagnetic valve 16, and a pressure gauge 18 is provided on the tip side of the branch line 17.
A filling hose 21 is connected to the downstream of the liquid phase line 6 via a coupling 20. A filling nozzle 22 connected to a filling port (not shown) of the vehicle container 2 is provided at the tip of the filling hose 21.

気相ライン７には、当該気相ライン7内を流通する気化ガスの流量を計測するための流量計（以下、気相ライン側流量計という。）２５及び前記均圧弁８が貯蔵容器３から車両容器２側に向けてこの順で配設されている。気相ライン７における車両容器２側部分には、３本の分岐ライン２６が設けられており、各分岐ライン２６の先端部には、車両容器２内の圧力（車両容器内圧力）Ｐｓを測定するための圧力センサ（以下、車両容器側圧力センサという。）２７、車両容器２内の温度（車両容器内温度）Ｔｓを測定するための温度センサ（以下、車両容器側温度センサという。）２８及び安全弁２９がそれぞれ設けられている。気相ライン７の車両容器２側部分には、カップリング３０を介して気相ライン用ホース３１が接続されている。そして、気相ライン用ホース３１は、その車両容器２側に気相ライン接続口３２を設けており、気相ライン接続口３２を介して車両容器２に接続される。   In the gas phase line 7, a flow meter (hereinafter referred to as a gas phase line side flow meter) 25 for measuring the flow rate of the vaporized gas flowing in the gas phase line 7 and the pressure equalizing valve 8 are provided from the storage container 3. It arrange | positions in this order toward the vehicle container 2 side. Three branch lines 26 are provided on the side of the vehicle container 2 in the gas phase line 7, and the pressure (vehicle container internal pressure) Ps in the vehicle container 2 is measured at the tip of each branch line 26. Pressure sensor (hereinafter referred to as a vehicle container side pressure sensor) 27, and a temperature sensor (hereinafter referred to as a vehicle container side temperature sensor) 28 for measuring a temperature (vehicle container internal temperature) Ts in the vehicle container 2. And a safety valve 29 are provided. A gas phase line hose 31 is connected to the vehicle container 2 side portion of the gas phase line 7 via a coupling 30. The gas-phase line hose 31 is provided with a gas-phase line connection port 32 on the vehicle container 2 side, and is connected to the vehicle container 2 via the gas-phase line connection port 32.

また、貯蔵容器３の上部側には貯蔵容器３内の圧力（貯蔵容器内圧力）Ｐｔ及び温度（貯蔵容器内温度）Ｔｔを夫々測定する圧力センサ（以下、貯蔵容器側圧力センサという。）３３及び温度センサ（以下、貯蔵容器側温度センサという。）３４が設けられている。   Further, on the upper side of the storage container 3, a pressure sensor (hereinafter referred to as a storage container side pressure sensor) 33 for measuring the pressure (storage container pressure) Pt and the temperature (storage container temperature) Tt in the storage container 3 respectively. And a temperature sensor (hereinafter referred to as a storage container side temperature sensor) 34 is provided.

コントローラ５は、ポンプ１１、供給側流量計１４、電磁弁１６、車両容器側圧力センサ２７、車両容器側温度センサ２８、貯蔵容器側圧力センサ３３、貯蔵容器側温度センサ３４、均圧弁８及び図示しない充填開始スイッチに接続されている。コントローラ５は、図示しないメモリに格納されたプログラムを実行して、対応する各機器からの検出データを受けつつ貯蔵容器３から車両容器２への液化ガスの充填を行うように対応する各機器の制御を行う。コントローラ５は、前記プログラムを実行する過程で主に供給側流量計１４の検出データを用いて、車両容器２への液化ガスの充填量を計測し、計測結果及び内容について、必要に応じて図示しないディスプレイに表示させたり、図示しないプリンタによりプリントさせる。   The controller 5 includes a pump 11, a supply-side flow meter 14, a solenoid valve 16, a vehicle container-side pressure sensor 27, a vehicle container-side temperature sensor 28, a storage container-side pressure sensor 33, a storage container-side temperature sensor 34, a pressure equalizing valve 8, and an illustration. Not connected to the filling start switch. The controller 5 executes a program stored in a memory (not shown) and receives the detection data from each corresponding device while filling the liquefied gas from the storage container 3 to the vehicle container 2. Take control. The controller 5 measures the filling amount of the liquefied gas into the vehicle container 2 mainly using the detection data of the supply side flow meter 14 in the process of executing the program, and shows the measurement results and contents as necessary. Display on a display that does not, or print by a printer (not shown).

さらに、コントローラ５は、図２のフローチャートに示される制御を行い、均圧弁８の開閉を制御し、これにより、貯蔵容器３の気化ガスが気相ライン７を通して車両容器２に不要に供給されるような事態になることを回避し、車両容器２への液化ガスの充填量を精度高く計測できるようにしている。なお、図２のフローチャートの実行に際し、その初期状態で均圧弁８は閉弁されている。
以下、図２のフローチャートに基づいて、本実施形態に係る液化ガス充填装置１の作用（液化ガス充填方法）を説明する。 Further, the controller 5 performs the control shown in the flowchart of FIG. 2 to control the opening and closing of the pressure equalizing valve 8, whereby the vaporized gas in the storage container 3 is unnecessarily supplied to the vehicle container 2 through the gas phase line 7. Such a situation is avoided, and the filling amount of the liquefied gas into the vehicle container 2 can be measured with high accuracy. When the flowchart of FIG. 2 is executed, the pressure equalizing valve 8 is closed in the initial state.
Hereinafter, the operation (liquefied gas filling method) of the liquefied gas filling apparatus 1 according to the present embodiment will be described based on the flowchart of FIG.

図２において、まず、充填開始スイッチがオン（ＯＮ）されたか否かが判定される（ステップＳ１）。ステップＳ１でＮＯと判定すると再度当該判定を行う。ステップＳ１でＹＥＳと判定すると、コントローラ５は電磁弁１６（充填用電磁弁１６）を開弁する（ステップＳ２）。ステップＳ２の処理により、液化液相ライン６を通して貯蔵容器３から車両容器２に液化ガスが移動し、車両容器２への液化ガスの充填が進む。   In FIG. 2, it is first determined whether or not the filling start switch is turned on (step S1). If it is determined NO in step S1, the determination is performed again. If YES is determined in step S1, the controller 5 opens the solenoid valve 16 (filling solenoid valve 16) (step S2). By the process of step S2, the liquefied gas moves from the storage container 3 to the vehicle container 2 through the liquefied liquid phase line 6, and the filling of the liquefied gas into the vehicle container 2 proceeds.

なお、充填初期時には均圧弁８は閉弁されており、この状態では気相ライン７を通して気化ガスが貯蔵容器３から車両容器２へ、或いは車両容器２から貯蔵容器３へ移動することはない。均圧弁８が閉弁された状態で、液化ガスの充填が進むと、車両容器２の気相部の容積が逓減し（ひいては車両容器２の気相部の圧力が逓増し）、これに対応するように、供給側流量計１４で計測される計測流量は少なくなる特性を示す。換言すれば、均圧弁８が閉弁状態で液化ガスの充填が進行して車両容器２の気相部の圧力が大きくなった状態では、液化ガスの車両容器２への充填が停滞する傾向になる。
そして、このように車両容器２の気相部の圧力が逓増した状態（この状態は、貯蔵容器３の気相部の圧力と車両容器２の気相部の圧力との圧力差が小さくなっている状態でもある。）で、仮に均圧弁８を開弁すると、気相ライン７を通して両容器（貯蔵容器３、車両容器２）の気相部について均圧化が進み、その分、均圧弁８が閉弁している状態に比して、液化ガスの車両容器２への充填が進みやすくなる。 At the initial stage of filling, the pressure equalizing valve 8 is closed. In this state, the vaporized gas does not move from the storage container 3 to the vehicle container 2 or from the vehicle container 2 to the storage container 3 through the gas phase line 7. When filling of the liquefied gas proceeds while the pressure equalizing valve 8 is closed, the volume of the gas phase portion of the vehicle container 2 is gradually reduced (and the pressure of the gas phase portion of the vehicle container 2 is increased). As shown, the measured flow rate measured by the supply-side flow meter 14 shows a characteristic that decreases. In other words, when the pressure equalization valve 8 is closed and the filling of the liquefied gas proceeds and the pressure in the gas phase portion of the vehicle container 2 increases, the filling of the liquefied gas into the vehicle container 2 tends to stagnate. Become.
And the state where the pressure of the gas phase part of the vehicle container 2 is increased in this way (in this state, the pressure difference between the pressure of the gas phase part of the storage container 3 and the pressure of the gas phase part of the vehicle container 2 becomes small. When the pressure equalizing valve 8 is opened, the pressure equalization proceeds in the gas phase portions of both containers (storage container 3 and vehicle container 2) through the gas phase line 7, and the pressure equalizing valve 8 is correspondingly increased. Compared with the state where the valve is closed, the filling of the liquefied gas into the vehicle container 2 is facilitated.

ステップＳ２に続いて、貯蔵容器側温度センサ３４が検出した貯蔵容器内温度Ｔｔから車両容器側温度センサ２８が検出した車両容器内温度Ｔｓを減算した値（以下、便宜上、両容器内温度差という。）が、所定温度Ｔ０を超える値であるか否かを判定する（ステップＳ３）。   Subsequent to step S2, a value obtained by subtracting the vehicle container temperature Ts detected by the vehicle container temperature sensor 28 from the storage container temperature Tt detected by the storage container temperature sensor 34 (hereinafter referred to as the temperature difference between the containers). .) Is a value that exceeds a predetermined temperature T0 (step S3).

ステップＳ３でＮＯと判定すると、貯蔵容器側圧力センサ３３が検出した（圧力検出工程を構成する。）貯蔵容器内圧力Ｐｔから車両容器側圧力センサ２７が検出した（圧力検出工程を構成する。）車両容器内圧力Ｐｓを減算した値（以下、便宜上、両容器内圧力差という。）が所定圧力Ｐ０を超える値であるか否かを判定する（ステップＳ４）。
ステップＳ４、或いは、前述のステップＳ３においてＹＥＳと判定した場合は、供給側流量計１４の計測流量Ｒｖが所定流量Ｂ（この実施形態では極めて０に近い値に設定されている。）未満であるか否かを判定する（ステップＳ５）。
ステップＳ５でＮＯと判定した場合（貯蔵容器３から車両容器２への液化ガスの供給が行われている場合）、ステップＳ３に戻る。ステップＳ５でＹＥＳと判定した場合（貯蔵容器３から車両容器２への液化ガスの供給がほぼ停止している場合）、ステップＳ６に進む。 If it is determined NO in step S3, the storage container side pressure sensor 33 detects (configures the pressure detection process), and the vehicle container side pressure sensor 27 detects from the storage container internal pressure Pt (configures the pressure detection process). It is determined whether or not a value obtained by subtracting the vehicle container internal pressure Ps (hereinafter referred to as a pressure difference between the two container internals) exceeds a predetermined pressure P0 (step S4).
If YES is determined in step S4 or step S3 described above, the measured flow rate Rv of the supply-side flow meter 14 is less than a predetermined flow rate B (which is set to a value very close to 0 in this embodiment). Is determined (step S5).
When it determines with NO by step S5 (when supply of the liquefied gas from the storage container 3 to the vehicle container 2 is performed), it returns to step S3. When it determines with YES at step S5 (when supply of the liquefied gas from the storage container 3 to the vehicle container 2 has stopped substantially), it progresses to step S6.

ステップＳ２で電磁弁１６が開弁した後、貯蔵容器内圧力Ｐｔと車両容器内圧力Ｐｓとの圧力差が所定圧力Ｐ０より大きい状態において、均圧弁８を開弁させると気相ライン７を介して貯蔵容器３内の気化ガスが車両容器２へ流出してしまうこととなる。このため、貯蔵容器内圧力Ｐｔと車両容器内圧力Ｐｓとの圧力差が所定圧力Ｐ０より大きい場合には、ステップＳ４でＹＥＳと判定して、ステップＳ５に進み、ステップＳ５でＮＯと判定することになり、ステップＳ３ひいてはステップＳ４、Ｓ５のループを継続して行い、液化ガスの車両容器２への充填が進む。また、貯蔵容器内圧力Ｐｔと車両容器内圧力Ｐｓとの圧力差が所定圧力Ｐ０以下の場合には、均圧弁８を開弁したとしても気相ライン７を介して貯蔵容器３より車両容器２へ流出する気化ガスの流出量は少ないため、Ｓ７の処理に移行し、均圧弁８を開弁させることにより、貯蔵容器３内より車両容器２への液化ガスの供給を促進させる。
すなわち、両容器内圧力差（貯蔵容器内圧力Ｐｔ−車両容器内圧力Ｐｓ）が所定圧力Ｐ０を超える値である場合には、均圧弁８は閉弁状態が維持され、これにより気相ライン７を通って液化ガスが車両容器２に不要に供給されるようなことを回避している。
このため、貯蔵容器内圧力Ｐｔが車両容器内圧力Ｐｓに対して大きくて、仮に均圧弁８を開弁していた場合に気相ライン７を通って車両容器２に液化ガスが供給されてしまうことで惹起する液化ガス充填量の計測精度の低下を招くことがない。 After the electromagnetic valve 16 is opened in step S2, when the pressure equalizing valve 8 is opened in a state where the pressure difference between the storage container internal pressure Pt and the vehicle container internal pressure Ps is larger than the predetermined pressure P0, the gas line 7 is connected. As a result, the vaporized gas in the storage container 3 flows out to the vehicle container 2. For this reason, when the pressure difference between the storage container internal pressure Pt and the vehicle container internal pressure Ps is larger than the predetermined pressure P0, YES is determined in step S4, the process proceeds to step S5, and NO is determined in step S5. Then, the loop of Step S3 and Steps S4 and S5 is continuously performed, and the filling of the liquefied gas into the vehicle container 2 proceeds. Further, when the pressure difference between the storage container internal pressure Pt and the vehicle container internal pressure Ps is equal to or less than the predetermined pressure P0, the vehicle container 2 from the storage container 3 via the gas phase line 7 even if the pressure equalizing valve 8 is opened. Since the amount of vaporized gas flowing out into the tank is small, the process proceeds to S7 and the pressure equalizing valve 8 is opened to promote the supply of liquefied gas from the storage container 3 to the vehicle container 2.
That is, when the pressure difference between the two containers (the pressure in the storage container Pt−the pressure in the vehicle container Ps) exceeds the predetermined pressure P0, the pressure equalizing valve 8 is maintained in the closed state. This prevents the liquefied gas from being unnecessarily supplied to the vehicle container 2 through the vehicle.
For this reason, when the internal pressure Pt of the storage container is larger than the internal pressure Ps of the vehicle container and the pressure equalizing valve 8 is opened, the liquefied gas is supplied to the vehicle container 2 through the gas phase line 7. Thus, the measurement accuracy of the liquefied gas filling amount caused by this is not reduced.

また、前記ステップＳ５でＹＥＳ、すなわち液化ガスの流量が極めて少なくなる（このことは、車両容器２への液化ガスへの充填がほとんど終了段階まで進んだことに相当する）と、電磁弁１６を閉弁し（ステップＳ６）、充填処理を終了する。なお、この場合には、均圧弁８が開弁することなく今回の貯蔵容器３より車両容器２への液化ガスの供給は終了することになる。   If YES in step S5, that is, the flow rate of the liquefied gas becomes extremely small (this corresponds to the fact that the filling of the liquefied gas into the vehicle container 2 has almost been completed), the solenoid valve 16 is turned on. The valve is closed (step S6), and the filling process is terminated. In this case, the supply of the liquefied gas from the current storage container 3 to the vehicle container 2 is completed without the pressure equalizing valve 8 being opened.

一方、前述のステップＳ４でＮＯと判定すると、前述のＳ７において均圧弁８を開弁し、車両容器内圧力Ｐｓが飽和蒸気圧Ｐｈとほぼ一致している（換言すれば、車両容器２内の液化ガスがガス化する）か否（車両容器２内の液化ガスがガス化しない）かを判定する（ステップＳ８）。   On the other hand, if NO is determined in the above-described step S4, the pressure equalizing valve 8 is opened in the above-described S7, and the vehicle container internal pressure Ps is substantially equal to the saturated vapor pressure Ph (in other words, in the vehicle container 2). It is determined whether or not the liquefied gas is gasified (the liquefied gas in the vehicle container 2 is not gasified) (step S8).

ステップＳ８でＹＥＳと判定すると、貯蔵容器内圧力Ｐｔが飽和蒸気圧Ｐｈとほぼ一致している（換言すれば、貯蔵容器３内の液化ガスがガス化する）か否（貯蔵容器３内の液化ガスがガス化しない）かを判定する（ステップＳ９）。ステップＳ９でＹＥＳと判定すると、供給側流量計１４の計測流量Ｒｖが所定流量Ｂ未満であるか否かを判定する（ステップＳ１０）。
ステップＳ１０でＹＥＳと判定すると、均圧弁８を閉弁し（ステップＳ１１）、電磁弁１６を閉弁し（ステップＳ６）、この均圧弁８の制御を含む充填制御処理を終了する。ステップＳ１０でＹＥＳと判定すると、ステップＳ８に戻る。 If YES is determined in step S8, whether or not the storage container pressure Pt substantially coincides with the saturated vapor pressure Ph (in other words, the liquefied gas in the storage container 3 is gasified) (liquefaction in the storage container 3). It is determined whether the gas is not gasified (step S9). If YES is determined in step S9, it is determined whether or not the measured flow rate Rv of the supply-side flow meter 14 is less than the predetermined flow rate B (step S10).
If YES is determined in step S10, the pressure equalizing valve 8 is closed (step S11), the electromagnetic valve 16 is closed (step S6), and the filling control process including the control of the pressure equalizing valve 8 is ended. If YES is determined in the step S10, the process returns to the step S8.

ステップＳ８でＮＯと判定した場合、又は、ステップＳ９でＮＯと判定した場合には、均圧弁８を閉弁し（ステップＳ１２）、供給側流量計１４の計測流量Ｒｖが所定流量Ｂ未満であるか否かを判定する（ステップＳ１３）。ステップＳ１３でＮＯと判定すると、ステップＳ３に戻る。ステップＳ１３でＹＥＳと判定すると、ステップＳ６に進む。
ステップＳ３でＹＥＳと判定した場合、又はステップＳ４でＹＥＳと判定した場合は、供給側流量計１４の計測流量Ｒｖが所定流量Ｂ未満であるか否かを判定する（ステップＳ５）。ステップＳ５でＮＯと判定した場合、ステップＳ３に戻る。ステップＳ５でＹＥＳと判定した場合、ステップＳ６に進む。 If NO is determined in step S8, or if NO is determined in step S9, the pressure equalizing valve 8 is closed (step S12), and the measured flow rate Rv of the supply-side flow meter 14 is less than the predetermined flow rate B. Whether or not (step S13). If NO is determined in step S13, the process returns to step S3. If it determines with YES by step S13, it will progress to step S6.
If YES is determined in step S3, or if YES is determined in step S4, it is determined whether or not the measured flow rate Rv of the supply-side flow meter 14 is less than the predetermined flow rate B (step S5). If NO is determined in step S5, the process returns to step S3. If it is determined as YES in step S5, the process proceeds to step S6.

この第1実施形態では、上述したように両容器内圧力差（貯蔵容器内圧力Ｐｔ−車両容器内圧力Ｐｓ）が所定圧力Ｐ０を超える値である場合には、均圧弁８は閉弁状態が維持されて開弁せず、気相ライン７を通って液化ガスが車両容器２に不要に供給されるようなことを回避する。このため、気相ライン７を通って車両容器２に液化ガスが供給されてしまうことで惹起する液化ガス充填量の計測精度の低下を招くことがない。   In the first embodiment, as described above, when the pressure difference between the two containers (the pressure in the storage container Pt−the pressure in the vehicle container Ps) exceeds the predetermined pressure P0, the pressure equalizing valve 8 is in the closed state. This prevents the liquefied gas from being unnecessarily supplied to the vehicle container 2 through the gas phase line 7 without being opened. For this reason, the measurement accuracy of the filling amount of the liquefied gas caused by the liquefied gas being supplied to the vehicle container 2 through the gas phase line 7 is not reduced.

次に、本発明の第２実施形態を図３に基づき、図１、図２を参照して説明する。
この第２実施形態に係る液化ガス充填装置は、第１実施形態に係る液化ガス充填装置（図１）と略同等の構成を有し、コントローラが、第１実施形態のコントローラに比して、図２のフローチャートに代わる図３のフローチャートに示される制御内容を実行することが主に異なっている。なお、前述の第１実施形態のコントローラの制御内容である図２のフローチャートと相違するステップはＳ２０とＳ２１の処理のみである。よって、以下の図３のフローチャートに示される制御内容の説明において、同一の制御内容については同一のステップ番号を付しその説明を省略するとともに、主にＳ２０とＳ２１の処理について以下に説明する。
図３のフローチャートは、後述するように、液化ガスの供給の終了が近いことを検出する液化ガス供給終了検出手段を設け、コントローラ（図１、コントローラ５参照）が、前記液化ガス供給終了検出手段の検出に基づき前記均圧弁８（図１参照）を開弁させるようにしている。気相ライン７を通した車両容器２への不要な液化ガスの充填を抑制するための均圧弁８の開弁制御について、第１実施形態では、圧力センサ（車両容器側圧力センサ２７、貯蔵容器側圧力センサ３３）が検出するデータを用いて行っているが、この第２実施形態では、後述するように圧力センサに代えて供給側流量計１４が計測する計測流量Ｒｖを用いて行っている。
この第２実施形態でも、第１実施形態の場合と同様に、均圧弁８は少なくとも充填初期時には閉弁されている。 Next, a second embodiment of the present invention will be described with reference to FIGS. 1 and 2 based on FIG.
The liquefied gas filling apparatus according to the second embodiment has substantially the same configuration as the liquefied gas filling apparatus (FIG. 1) according to the first embodiment, and the controller is compared with the controller of the first embodiment. The main difference is that the control contents shown in the flowchart of FIG. 3 instead of the flowchart of FIG. 2 are executed. The steps different from the flowchart of FIG. 2 which is the control content of the controller of the first embodiment described above are only the processes of S20 and S21. Therefore, in the description of the control content shown in the flowchart of FIG. 3 below, the same control number is assigned the same step number and the description thereof is omitted, and the processing of S20 and S21 is mainly described below.
As will be described later, the flowchart of FIG. 3 includes liquefied gas supply end detection means for detecting that the supply of liquefied gas is almost finished, and the controller (see controller 5 in FIG. 1) is configured to detect the liquefied gas supply end detection means. Based on this detection, the pressure equalizing valve 8 (see FIG. 1) is opened. Regarding the valve opening control of the pressure equalizing valve 8 for suppressing the filling of the unnecessary liquefied gas into the vehicle container 2 through the gas phase line 7, in the first embodiment, the pressure sensor (the vehicle container side pressure sensor 27, the storage container). In the second embodiment, the measurement flow rate Rv measured by the supply-side flow meter 14 is used instead of the pressure sensor as will be described later. .
In the second embodiment as well, as in the first embodiment, the pressure equalizing valve 8 is closed at least at the initial stage of filling.

そして、ステップＳ３でＹＥＳと判定した場合、又はステップＳ４でＹＥＳと判定する場合にステップＳ２０〔供給側流量計１４の計測流量Ｒｖが所定流量Ａ（Ａ＞Ｂ≒０）未満であるか否かの判定、すなわち充填終了直前であるか否かの判定〕の処理を行い、ステップＳ２０でＹＥＳ（充填終了直前である）と判定した場合にステップＳ２１に進み、供給側流量計１４の計測流量Ｒｖが所定流量Ｂ未満であるか否か、即ち、充填終了であるか否かを判定し、Ｓ２１で供給側流量計１４の計測流量Ｒｖが所定流量Ｂ以上である場合にステップＳ７の処理に進み、また、Ｓ２１において充填終了であると判定した場合にステップＳ６の処理に移行して電磁弁１６を閉弁し、この均圧弁８の制御を含む充填制御処理を終了するように構成した。   If YES is determined in step S3, or if YES is determined in step S4, whether or not the measured flow rate Rv of the supply-side flow meter 14 is less than the predetermined flow rate A (A> B≈0). In other words, if it is determined as YES (immediately before the end of filling) in step S20, the process proceeds to step S21, and the measured flow rate Rv of the supply side flow meter 14 is determined. Is less than the predetermined flow rate B, that is, whether or not the filling is finished. If the measured flow rate Rv of the supply-side flow meter 14 is greater than or equal to the predetermined flow rate B in S21, the process proceeds to step S7. Further, when it is determined in S21 that the filling is completed, the process proceeds to step S6, the electromagnetic valve 16 is closed, and the filling control process including the control of the pressure equalizing valve 8 is finished.

ステップＳ２０で供給側流量計１４の計測流量Ｒｖが所定流量Ａ（Ａ＞Ｂ≒０）未満であるか否かの判定、すなわち充填終了直前であるか否かの判定を行い、ステップＳ２０でＹＥＳ（充填終了直前である）と判定し、ステップＳ２１でＮＯ、すなわち流量が所定流量Ｂ以上である場合に均圧弁８を開弁する（ステップＳ７）。なお、ステップＳ２１でＹＥＳの場合にはステップＳ６の処理に移行して電磁弁１６を閉弁し、この均圧弁８の制御を含む充填制御処理を終了する。また、ステップＳ２０でＮＯと判定した場合は、ステップＳ３に戻る。   In step S20, it is determined whether or not the measured flow rate Rv of the supply-side flow meter 14 is less than a predetermined flow rate A (A> B≈0), that is, whether or not it is just before the end of filling, and YES in step S20. It is determined that (just before the end of filling), and if NO in step S21, that is, if the flow rate is equal to or higher than the predetermined flow rate B, the pressure equalizing valve 8 is opened (step S7). If YES in step S21, the process proceeds to step S6, the electromagnetic valve 16 is closed, and the filling control process including the control of the pressure equalizing valve 8 is terminated. Moreover, when it determines with NO by step S20, it returns to step S3.

供給側流量計１４の計測流量Ｒｖが所定流量Ａ未満となる状態（充填終了直前であると判定される状態）は、貯蔵容器３内の圧力が車両容器２内の圧力と略同等になり、仮に均圧弁８が開弁しても気相ライン７を通しては液化ガスが車両容器２に供給されない状態になっていることに相当する。
すなわち、本実施形態では、両容器内圧力差（貯蔵容器内圧力Ｐｔ−車両容器内圧力Ｐｓ）が所定圧力値より小さくて（ステップＳ４でＮＯ）、かつ、供給側流量計１４の計測流量Ｒｖが所定流量Ａ未満であり（ステップＳ２０でＹＥＳ）、かつ、供給側流量計１４の計測流量Ｒｖが所定流量Ｂ以上であるという３つの条件を満たした場合にのみ、均圧弁８を開弁する（ステップＳ７)。
このため、均圧弁８は閉弁状態が維持されて開弁せず、気相ライン７を通って液化ガスが車両容器２に不要に供給されるようなことを回避する。これにより、気相ライン７を通って車両容器２に液化ガスが供給されてしまうことで惹起する液化ガス充填量の計測精度の低下を招くことがない。 In a state where the measured flow rate Rv of the supply-side flow meter 14 is less than the predetermined flow rate A (a state determined to be immediately before the end of filling), the pressure in the storage container 3 is substantially equal to the pressure in the vehicle container 2, Even if the pressure equalizing valve 8 is opened, this corresponds to a state in which liquefied gas is not supplied to the vehicle container 2 through the gas phase line 7.
That is, in the present embodiment, the pressure difference between the two containers (storage container pressure Pt−vehicle container pressure Ps) is smaller than a predetermined pressure value (NO in step S4), and the measured flow rate Rv of the supply side flow meter 14 is measured. Is less than the predetermined flow rate A (YES in step S20), and the pressure equalizing valve 8 is opened only when the three conditions that the measured flow rate Rv of the supply-side flow meter 14 is equal to or higher than the predetermined flow rate B are satisfied. (Step S7).
For this reason, the pressure equalizing valve 8 is maintained in the closed state and is not opened, and it is avoided that the liquefied gas is unnecessarily supplied to the vehicle container 2 through the gas phase line 7. Thereby, the measurement accuracy of the liquefied gas filling amount caused by the liquefied gas being supplied to the vehicle container 2 through the gas phase line 7 is not reduced.

また、上述したように、ステップＳ４でＮＯと判定し、かつ供給側流量計１４の計測流量Ｒｖが所定流量Ｂ以上所定流量Ａ未満である（ステップＳ２０でＹＥＳ，ステップＳ２１でＮＯ）場合に、均圧弁８を開弁する（ステップＳ７)。そして、均圧弁８が開くことにより、貯蔵容器３の気相部の圧力及び車両容器２の気相部の圧力が均圧化され、車両容器２への液化ガスの充填が迅速に進むことになる。本実施形態では、ステップＳ２０が液化ガス充填末期検出手段を構成している。   Further, as described above, when NO is determined in step S4 and the measured flow rate Rv of the supply-side flow meter 14 is equal to or greater than the predetermined flow rate B and less than the predetermined flow rate A (YES in step S20, NO in step S21), The pressure equalizing valve 8 is opened (step S7). When the pressure equalizing valve 8 is opened, the pressure in the gas phase portion of the storage container 3 and the pressure in the gas phase portion of the vehicle container 2 are equalized, and the filling of the liquefied gas into the vehicle container 2 proceeds rapidly. Become. In this embodiment, step S20 constitutes a liquefied gas filling end detection means.

上記実施形態では、ステップＳ２０（液化ガス充填末期検出手段）で、充填終了直前であるか否かを判定しているが、これに限らず、均圧弁８を開弁しても、気相ライン７を通して、液化ガスが不要に車両容器２に充填されなければ、必ずしも充填終了直前でなくてもよく、例えば、所定流量Ａよりも大きい所定流量ＡＴ（ＡＴ＞Ａ）を所定流量Ａに代えて用いて、ステップＳ２０の判定を行うようにしてもよい。
また、本実施形態では、液化ガス充填末期検出手段について、流量を用いて構成（ステップＳ２０）しているが、これに代えて、時間を用いて構成してもよい。例えば、充填開始から所定時間が経過して液化ガスの充填が進むと、仮に均圧弁８を開弁しても気相ライン７を通して車両容器２への液化ガスの不要な充填は行われなくなることを利用し、充填開始から例えば２０秒又は３０秒、経過したか否かの判定を行うステップを構成し、このステップを液化ガス充填末期検出手段として用いてもよい。 In the above embodiment, it is determined in step S20 (liquefied gas filling end detection means) whether or not it is just before the end of filling, but not limited to this, even if the pressure equalizing valve 8 is opened, the gas phase line 7, if the vehicle container 2 is not unnecessarily filled with the liquefied gas, it does not necessarily have to be immediately before the end of filling. For example, the predetermined flow rate AT (AT> A) larger than the predetermined flow rate A is replaced with the predetermined flow rate A. It may be used to perform the determination in step S20.
In the present embodiment, the liquefied gas filling end detection means is configured using the flow rate (step S20), but may be configured using time instead. For example, if liquefied gas filling progresses after a predetermined time has elapsed from the start of filling, even if the pressure equalizing valve 8 is opened, unnecessary filling of the liquefied gas into the vehicle container 2 through the gas phase line 7 is not performed. For example, a step of determining whether or not 20 seconds or 30 seconds have elapsed from the start of filling may be configured, and this step may be used as a liquefied gas filling end detection means.

次に、本発明の第３実施形態を図４のフローチャートに基づいて説明する。
この第３実施形態では、第１実施形態のステップＳ１及びＳ２と同様に、ステップＳ１及びＳ２が実行され、ステップＳ２に続いて、ポンプ１１を作動（ＯＮ）し（ステップＳ４０）、供給側流量計１４の計測流量Ｒｖが充填終了時流量Ｒｅｅより小さいか否かを判定する（ステップＳ４１）。 Next, a third embodiment of the present invention will be described based on the flowchart of FIG.
In the third embodiment, similarly to steps S1 and S2 of the first embodiment, steps S1 and S2 are executed, and following step S2, the pump 11 is operated (ON) (step S40), and the supply side flow rate is determined. It is determined whether or not the measured flow rate Rv of the total 14 is smaller than the filling end flow rate Ree (step S41).

ステップＳ４１でＹＥＳ（Ｒｖ＜Ｒｅｅ）と判定すると、ポンプ１１を停止し（ステップＳ４２）、均圧弁８を閉弁し（ステップＳ４３）、電磁弁１６を閉じて（ステップＳ４４）充填作業を停止する。
ステップＳ４１でＮＯ（Ｒｅｅ≦Ｒｖ）と判定すると、供給側流量計１４の計測流量Ｒｖが充填終了直前流量Ｒｅより小さい（計測流量Ｒｖ＜充填終了直前流量Ｒｅ）か否かの判定を行う（ステップＳ４５）。本実施形態では、充填終了直前流量Ｒｅが請求項３の所定流量に相当する。 If YES in step S41 (Rv <Ree), the pump 11 is stopped (step S42), the pressure equalizing valve 8 is closed (step S43), the electromagnetic valve 16 is closed (step S44), and the filling operation is stopped. .
If NO (Ree ≦ Rv) is determined in step S41, it is determined whether or not the measured flow rate Rv of the supply-side flow meter 14 is smaller than the flow rate Re immediately before filling end (measured flow rate Rv <flow rate immediately before filling end Re). S45). In the present embodiment, the flow rate Re immediately before completion of filling corresponds to the predetermined flow rate of claim 3.

ステップＳ４５でＹＥＳ（Ｒｖ＜Ｒｅ）と判定すると均圧弁８を開き（ステップＳ４６）、ステップＳ４１に戻る。ステップＳ４５でＮＯ（Ｒｅ≦Ｒｖ）と判定すると、ステップＳ４６を経ることなくステップＳ４１に戻る。   If YES in step S45 (Rv <Re), the pressure equalizing valve 8 is opened (step S46), and the process returns to step S41. If NO (Re ≦ Rv) is determined in step S45, the process returns to step S41 without passing through step S46.

電磁弁１６の開弁により液化ガスの充填が開始され、充填の進行に伴い供給側流量計１４の計測流量Ｒｖは、逓減することになる。この第３実施形態では、この特性を利用して液化ガス充填終了が近いことを検出するようにしている。すなわち、ステップＳ４１でＹＥＳ（Ｒｖ＜Ｒｅｅ）と判定すると、充填が充分行われたとしてポンプ１１の停止（ステップＳ４２）などを行い充填作業を停止する。   Filling of the liquefied gas is started by opening the solenoid valve 16, and the measured flow rate Rv of the supply-side flow meter 14 is gradually reduced as the filling progresses. In the third embodiment, this characteristic is used to detect that the end of liquefied gas filling is near. That is, if it is determined as YES (Rv <Ree) in step S41, the filling operation is stopped by stopping the pump 11 (step S42) or the like because the filling is sufficiently performed.

一方、ステップＳ４１でＮＯ（Ｒｅｅ≦Ｒｖ）と判定した場合には、充填終了時流量Ｒｅｅより大きい値である充填終了直前流量Ｒｅに比して供給側流量計１４の計測流量Ｒｖが小さいか否かを判定し（ステップＳ４５）、ステップＳ４５でＮＯ（Ｒｅ≦Ｒｖ）と判定すると、ステップＳ４１に戻る。そして、ステップＳ４１及びステップＳ４５の処理を行う過程で、計測流量Ｒｖが低下する。計測流量Ｒｖの低下が進んでステップＳ４５でＹＥＳ（Ｒｖ＜Ｒｅ）と判定すると、ステップＳ４６に進んで均圧弁８を開弁する。   On the other hand, if NO (Ree ≦ Rv) is determined in step S41, whether or not the measured flow rate Rv of the supply-side flow meter 14 is smaller than the flow rate immediately before the end of filling, which is larger than the flow rate Ree at the end of filling. If it is determined (step S45) and NO (Re ≦ Rv) is determined in step S45, the process returns to step S41. And in the process of performing the process of step S41 and step S45, measured flow volume Rv falls. When the decrease in the measured flow rate Rv proceeds and it is determined as YES (Rv <Re) in step S45, the process proceeds to step S46 and the pressure equalizing valve 8 is opened.

この実施形態では、充填が開始され、計測流量Ｒｖが充填終了直前流量Ｒｅより小さく（Ｒｖ＜Ｒｅ）なって（ステップＳ４５でＹＥＳ）から均圧弁８を開弁し、計測流量Ｒｖが大きい状態では、均圧弁８を開弁せず、閉弁状態が維持される。
このため、計測流量Ｒｖが充填終了直前流量Ｒｅより小さくなるまで、すなわち、均圧弁８を開弁しても気相ライン７を通って車両容器２に液化ガスが供給されるような事態が回避されるような状態になるまで均圧弁８は開弁されないことから、気相ライン７を通って車両容器２に液化ガスが供給されてしまうことで惹起する液化ガス充填量の計測精度の低下を招くことがない。 In this embodiment, filling is started and the pressure equalizing valve 8 is opened after the measured flow rate Rv becomes smaller than the flow rate Re immediately before the end of filling (Rv <Re) (YES in step S45), and the measured flow rate Rv is large. The pressure equalizing valve 8 is not opened and the closed state is maintained.
For this reason, it is avoided that the liquefied gas is supplied to the vehicle container 2 through the gas phase line 7 until the measured flow rate Rv becomes smaller than the flow rate Re immediately before the end of filling, that is, even if the pressure equalizing valve 8 is opened. Since the pressure equalizing valve 8 is not opened until such a state is reached, the measurement accuracy of the liquefied gas filling amount caused by the liquefied gas being supplied to the vehicle container 2 through the gas phase line 7 is reduced. There is no invitation.

本発明の第1実施形態に係る液化ガス充填装置を示すシステム系統図である。1 is a system diagram showing a liquefied gas filling device according to a first embodiment of the present invention. 図1のコントローラの充填制御内容を示すフローチャートである。FIG. 2 is a flowchart showing the filling control content of the controller of FIG. 本発明の第２実施形態を説明するためのフローチャートである。It is a flowchart for demonstrating 2nd Embodiment of this invention. 本発明の第３実施形態を説明するためのフローチャートである。It is a flowchart for demonstrating 3rd Embodiment of this invention.

符号の説明Explanation of symbols

１…液化ガス充填装置、２…車両容器（被充填タンク）、３…貯蔵容器、５…コントローラ、６…液相ライン（ガス供給経路）、７…気相ライン（均圧ライン）、８…均圧弁、１４…供給側流量計、２７…車両容器側圧力センサ、３３…貯蔵容器側圧力センサ、３４…貯蔵容器側温度センサ。   DESCRIPTION OF SYMBOLS 1 ... Liquefied gas filling apparatus, 2 ... Vehicle container (filled tank), 3 ... Storage container, 5 ... Controller, 6 ... Liquid phase line (gas supply path), 7 ... Gas phase line (equal pressure line), 8 ... Pressure equalizing valve, 14 ... Supply side flow meter, 27 ... Vehicle container side pressure sensor, 33 ... Storage container side pressure sensor, 34 ... Storage container side temperature sensor.

Claims (6)

液化ガスの貯蔵容器及び被充填タンクを接続する液化ガス供給経路と、前記貯蔵容器から前記被充填タンクへの液化ガスの充填制御を行うコントローラと、を備えた液化ガス充填装置において、
前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインと、
該均圧ラインに設けられ前記コントローラの制御により開、閉弁して該均圧ラインの連通、遮断を行い液化ガス充填開始時には閉弁されている均圧弁と、
前記貯蔵容器内の圧力を検出する貯蔵容器内圧力検出手段と、
前記被充填タンク内の圧力を検出する被充填タンク内圧力検出手段と、を備え、
前記コントローラは、前記貯蔵容器内圧力検出手段が検出する貯蔵容器内圧力が前記被充填タンク内圧力検出手段が検出する被充填タンク内圧力よりも所定圧力以上大きい場合には前記均圧弁を開弁させないことを特徴とする液化ガス充填装置。 In a liquefied gas filling apparatus comprising: a liquefied gas supply path connecting a liquefied gas storage container and a tank to be filled; and a controller for controlling filling of the liquefied gas from the storage container to the tank to be filled.
A pressure equalization line connecting the gas phase part of the storage container and the gas phase part of the tank to be filled;
A pressure equalizing valve which is provided in the pressure equalizing line and is opened and closed under the control of the controller to open and close the pressure equalizing line, and is closed at the start of liquefied gas filling;
Storage container pressure detection means for detecting the pressure in the storage container;
A filling tank pressure detecting means for detecting the pressure in the filling tank,
The controller opens the pressure equalizing valve when the internal pressure of the storage container detected by the internal pressure detection means of the storage container is greater than the internal pressure of the tank to be filled detected by the internal pressure detection means of the tank to be filled by a predetermined pressure or more. A liquefied gas filling device characterized in that it is not allowed to flow. 液化ガスの貯蔵容器及び被充填タンクを接続する液化ガス供給経路と、前記貯蔵容器から前記被充填タンクへの液化ガスの充填制御を行うコントローラと、を備えた液化ガス充填装置において、
前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインと、
該均圧ラインに設けられ前記コントローラの制御により開、閉弁して該均圧ラインの連通、遮断を行い液化ガス充填開始時には閉弁されている均圧弁と、
前記液化ガスの前記被充填タンクへの充填の終了が近いことを検出する液化ガス充填末期検出手段と、を備え、
前記コントローラは、前記液化ガス供給終了検出手段の検出結果に基づき前記均圧弁を開弁させることを特徴とする液化ガス充填装置。 In a liquefied gas filling apparatus comprising: a liquefied gas supply path connecting a liquefied gas storage container and a tank to be filled; and a controller for controlling filling of the liquefied gas from the storage container to the tank to be filled.
A pressure equalization line connecting the gas phase part of the storage container and the gas phase part of the tank to be filled;
A pressure equalizing valve which is provided in the pressure equalizing line and is opened and closed under the control of the controller to open and close the pressure equalizing line, and is closed at the start of liquefied gas filling;
Liquefied gas filling end detection means for detecting that the filling of the liquefied gas into the tank to be filled is near the end, and
The liquefied gas filling device, wherein the controller opens the pressure equalizing valve based on a detection result of the liquefied gas supply end detecting means. 前記液化ガス供給終了検出手段は、前記貯蔵容器から前記被充填タンクへの液化ガスの供給量を計測する流量計により得られた計測流量が予め定めた所定流量以下に低下した場合に、前記液化ガスの前記被充填タンクへの充填の終了が近いことを検出することを特徴とする請求項２に記載の液化ガス充填装置。   The liquefied gas supply end detection means is configured to detect the liquefaction when a measured flow rate obtained by a flow meter for measuring a supply amount of the liquefied gas from the storage container to the filling tank drops below a predetermined flow rate. 3. The liquefied gas filling device according to claim 2, wherein it is detected that the filling of the filling tank with gas is almost finished. 貯蔵容器及び被充填タンクを接続する液化ガス供給経路を通して前記貯蔵容器より前記被充填タンクへ液化ガスを充填する液化ガス充填方法において、
前記貯蔵容器内の圧力及び前記被充填タンク内の圧力を検出する圧力検出工程を有し、
前記圧力検出工程で得られた前記貯蔵容器内の圧力が前記圧力検出工程で得られた前記被充填タンク内の圧力よりも所定圧力以上大きい場合には、前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインに設けられ液化ガス充填開始時には閉弁されている均圧弁を開弁しないことを特徴とする液化ガス充填方法。 In the liquefied gas filling method of filling liquefied gas from the storage container to the filling tank through the liquefied gas supply path connecting the storage container and the filling tank,
A pressure detection step of detecting the pressure in the storage container and the pressure in the tank to be filled;
When the pressure in the storage container obtained in the pressure detection step is larger than the pressure in the filling tank obtained in the pressure detection step by a predetermined pressure or more, the gas phase portion of the storage container and the covered portion A liquefied gas filling method characterized by not opening a pressure equalizing valve which is provided in a pressure equalizing line connecting gas phase portions of a filling tank and which is closed at the start of liquefied gas filling. 貯蔵容器及び被充填タンクを接続する液化ガス供給経路を通して前記貯蔵容器より前記被充填タンクへ液化ガスを充填する液化ガス充填方法において、
前記液化ガスの充填の終了が近いことが検出された場合、前記貯蔵容器の気相部及び前記被充填タンクの気相部を接続する均圧ラインに設けられ液化ガス充填開始時には閉弁されている均圧弁を開弁させることを特徴とする液化ガス充填方法。 In the liquefied gas filling method of filling liquefied gas from the storage container to the filling tank through the liquefied gas supply path connecting the storage container and the filling tank,
When it is detected that the end of filling of the liquefied gas is near, the pressure equalizing line connecting the gas phase portion of the storage container and the gas phase portion of the tank to be filled is closed at the start of liquefied gas filling. A liquefied gas filling method comprising: opening a pressure equalizing valve. 前記貯蔵容器から前記被充填タンクへの液化ガスの供給量を計測する流量計により得られた計測流量が予め定めた所定流量以下に低下した場合に、前記液化ガスの充填の終了が近いと検出されることを特徴とする請求項５に記載の液化ガス充填方法。   When the measured flow rate obtained by the flow meter for measuring the supply amount of liquefied gas from the storage container to the tank to be filled is reduced to a predetermined flow rate or less, it is detected that the end of filling of the liquefied gas is near The liquefied gas filling method according to claim 5, wherein:
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