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JP4638319B2 - Evaporative fuel emission suppression device for fuel tank - Google Patents

Evaporative fuel emission suppression device for fuel tank Download PDF

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Publication number
JP4638319B2
JP4638319B2 JP2005302756A JP2005302756A JP4638319B2 JP 4638319 B2 JP4638319 B2 JP 4638319B2 JP 2005302756 A JP2005302756 A JP 2005302756A JP 2005302756 A JP2005302756 A JP 2005302756A JP 4638319 B2 JP4638319 B2 JP 4638319B2
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fuel
valve
tank body
tank
filler
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JP2007112182A (en
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治 滝沢
真人 四竃
洋輔 小坂
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Description

本発明は、タンク本体およびキャニスタを接続する第1蒸発燃料通路と、タンク本体およびフィラーチューブの給油口を接続する第2蒸発燃料通路と、第2蒸発燃料通路に設けられた差圧弁とを備え、前記差圧弁は給油口側およびタンク本体側を常時連通させる絞りを有する燃料タンクの蒸発燃料放出抑制装置に関する。 The present invention includes a first evaporative fuel passage connecting the tank main body and the canister, a second evaporative fuel passage connecting the tank main body and a filler tube, and a differential pressure valve provided in the second evaporative fuel passage. The differential pressure valve relates to a fuel tank evaporative fuel discharge suppressing device having a throttle that always connects the fuel filler side and the tank body side .

給油口を開いて給油ガンからフィラーチューブに燃料を供給するとき、給油ガンから出る燃料に吸引されて給油口からタンク本体内に大気が吸引されるのを防止すべく、タンク本体およびフィラーチューブの給油口を蒸発燃料通路で接続し、燃料の供給によってタンク本体から押し出された蒸発燃料の一部を蒸発燃料通路を介して給油口に戻し、この蒸発燃料を給油ガンから出る燃料で吸引して大気の吸引を防止するものが、下記特許文献1により公知である。   When supplying fuel to the filler tube from the fuel gun by opening the fuel filler port, the tank body and filler tube must be connected to prevent air from being sucked into the tank body from the fuel filler port. The fuel filler port is connected by an evaporative fuel passage, and part of the evaporated fuel pushed out of the tank body by the fuel supply is returned to the fuel filler port via the evaporative fuel passage, and this evaporated fuel is sucked by the fuel coming from the fuel gun. A device for preventing the suction of the atmosphere is known from Patent Document 1 below.

前記蒸発燃料通路には、タンク本体側が吸気口側よりも所定値だけ高圧になったときに開弁する差圧弁と、差圧弁に設けられてタンク本体側および吸気口側を常時連通させる絞りとを備えている。給油ガンから出る燃料の流量が大きいときには燃料による吸引力が強いため、差圧弁を開弁させて大量の蒸発燃料を給油口に戻して蒸発燃料を吸引することで大気の吸引を防止し、給油ガンから出る燃料の流量が小さいときには給油ガンから出る燃料による吸引力が弱く、給油口に戻された蒸発燃料を充分に吸引することができないため、前記絞りのみを通して少量の蒸発燃料を給油口に戻して大気への放散を防止するようになっている。
特許第3536289号公報
The evaporative fuel passage includes a differential pressure valve that opens when the tank main body side is higher than the intake port side by a predetermined value, and a throttle that is provided in the differential pressure valve and always communicates between the tank main body side and the intake port side. It has. When the flow rate of fuel coming out of the fuel gun is large, the suction force by the fuel is strong, so opening the differential pressure valve to return a large amount of evaporated fuel to the fuel filler port and sucking the evaporated fuel prevents air suction. When the flow rate of fuel coming out of the gun is small, the suction force by the fuel coming out of the fuel gun is weak, and the evaporated fuel returned to the fuel inlet cannot be sucked sufficiently. It is designed to prevent release to the atmosphere.
Japanese Patent No. 3536289

ところで、タンク本体の内部空間をエンジンの吸気負圧で減圧した後に一定間保持し、その間の内圧の増加を監視することでタンク本体のリークを検出することが行われている。この場合に、フィラーチューブの下端が燃料液面下に没しているとタンク本体の内部空間とフィラーチューブの内部空間とが差圧弁の絞りを介して連通することになり、タンク本体の内部空間を減圧しても、フィラーチューブの内分空間が充分に減圧されず、タンク本体の内圧を監視している間にフィラーチューブの内部空間に残ったエアが絞りを通過してタンク本体に流入することで、前記内圧が次第に上昇してリークが発生していると誤認される可能性があった。 Incidentally, the internal space of the tank main body and held constant during the time the pressure was reduced by the intake negative pressure of the engine, it has been made to detect leakage of the tank body by monitoring the increase in between the internal pressure. In this case, if the lower end of the filler tube is submerged below the fuel level, the internal space of the tank body and the internal space of the filler tube communicate with each other via the throttle of the differential pressure valve, and the internal space of the tank body Even if the pressure is reduced, the internal space of the filler tube is not sufficiently reduced, and the air remaining in the internal space of the filler tube passes through the throttle and flows into the tank body while monitoring the internal pressure of the tank body. As a result, there is a possibility that the internal pressure gradually increases and a leak is generated.

本発明は前述の事情に鑑みてなされたもので エンジンの吸気負圧を利用してタンク本体のリークを検出する際に、タンク本体およびフィラーチューブの給油口を接続する蒸発燃料通路に設けた差圧弁が障害にならないようにすることを目的とする。   The present invention has been made in view of the above-described circumstances. When the leak of the tank body is detected using the intake negative pressure of the engine, the difference provided in the evaporative fuel passage connecting the tank body and the filler tube filler port is provided. The purpose is to prevent the pressure valve from becoming an obstacle.

上記目的を達成するために、請求項1に記載された発明によれば、タンク本体およびキャニスタを接続する第1蒸発燃料通路と、タンク本体およびフィラーチューブの給油口を接続する第2蒸発燃料通路と、第2蒸発燃料通路に設けられた差圧弁とを備え、前記差圧弁は給油口側およびタンク本体側を常時連通させる絞りを有する燃料タンクの蒸発燃料放出抑制装置において、前記差圧弁は、燃料をフィラーチューブに供給する際には、タンク本体側が給油口側よりも所定値以上高圧のときに開弁してタンク本体から押し出された蒸発燃料の一部を第2蒸発燃料通路を介して給油口に戻すとともに、エンジンの吸気負圧を第1蒸発燃料通路を介してタンク本体に作用させて該タンク本体の内部空間を減圧する際には、給油口側がタンク本体側よりも所定値以上高圧のときに開弁してフィラーチューブの内部空間を第2蒸発燃料通路を介して減圧する2方向弁であことを特徴とする燃料タンクの蒸発燃料放出抑制装置が提案される。 To achieve the above object, according to the first aspect of the present invention, the first evaporative fuel passage connecting the tank body and the canister and the second evaporative fuel passage connecting the tank body and the filler port of the filler tube are connected. When, and a differential pressure valve disposed in the second fuel vapor passage, the vapor fuel discharge suppressing device for a fuel tank having said difference throttle valve is for communicating with the fuel supply port side and the tank main body side at all times, the differential pressure regulating valve is When fuel is supplied to the filler tube, a part of the evaporated fuel which is opened when the tank body side is higher than the fuel filler port side by a predetermined value or higher and is pushed out from the tank body is passed through the second evaporated fuel passage. together back to the fuel supply port, when the intake negative pressure of the engine is allowed to act on the tank body through the first evaporative fuel path for depressurizing the internal space of the tank body, the fuel supply port side tank main body Proposal remote predetermined value or more high-pressure vapor fuel discharge suppressing device for a fuel tank, characterized in that the inner space of the opening to the filler tube Ru 2-way valve der to reduce the pressure through the second evaporative fuel path when the Is done.

また請求項2に記載された発明によれば、請求項1の構成に加えて、前記絞りを差圧弁の弁体に形成したことを特徴とする燃料タンクの蒸発燃料放出抑制装置が提案される。   According to a second aspect of the present invention, in addition to the configuration of the first aspect, a fuel tank evaporative fuel emission suppressing device is proposed in which the throttle is formed in a valve body of a differential pressure valve. .

請求項1の構成によれば、給油口を開いて給油ガンからフィラーチューブに燃料を供給するとき、燃料の流量が大きい場合にはタンク本体内の蒸発燃料の一部が第2蒸発燃料通路の差圧弁を通って給油口に押し出され、給油ガンから出る燃料により発生する負圧で吸引されて再びタンク本体に戻されることで、給油口からタンク本体に大気が吸入されるのを防止できる。   According to the first aspect of the present invention, when fuel is supplied from the fuel gun to the filler tube by opening the fuel filler port, a part of the evaporated fuel in the tank body is in the second evaporated fuel passage when the fuel flow rate is large. It is possible to prevent air from being sucked into the tank main body from the fuel filler port by being pushed out through the differential pressure valve to the fuel filler port, sucked by the negative pressure generated by the fuel coming from the fuel gun, and returned to the tank body again.

給油ガンから出る燃料の流量が小さい場合には発生する負圧が小さいために、タンク本体から第2蒸発燃料通路を経て給油口に押し出された蒸発燃料をタンク本体に戻すことができず、その蒸発燃料が給油口から大気に放散されてしまう可能性があるが、閉弁した差圧弁の絞りを通過する微量の蒸発燃料だけが給油口に押し出されることで、蒸発燃料の大気放散を防止することができる。   Since the negative pressure generated when the flow rate of fuel exiting the fuel gun is small, the evaporated fuel pushed out from the tank body through the second evaporated fuel passage to the fuel inlet cannot be returned to the tank body. Evaporated fuel may be released from the fuel filler into the atmosphere, but only a small amount of evaporated fuel that passes through the throttle of the closed differential pressure valve is pushed out to the filler, thereby preventing the evaporated fuel from being released into the atmosphere. be able to.

エンジンの吸気負圧を第蒸発燃料通路を介してタンク本体に作用させて該タンク本体のリークを検出する際に、フィラーチューブの下部が燃料液面によってタンク本体の気相空間と分離されていても、吸気負圧を作用させると差圧弁が開弁して絞りが無効化されるので、フィラーチューブの内部空間およびタンク本体の内部空間を同時に減圧してリーク検出の精度を高めることができる。 When the intake negative pressure of the engine is allowed to act on the tank body through the first evaporative fuel path to detect leaks of the tank body, it has the lower portion of the filler tube is separated from the gas phase space of the tank main body by the fuel level However, if the intake negative pressure is applied, the differential pressure valve opens and the throttle is invalidated, so that the internal space of the filler tube and the internal space of the tank body can be simultaneously decompressed to increase the accuracy of leak detection. .

請求項2の構成によれば、絞りを差圧弁の弁体に形成したので、差圧弁の構造を簡素化することができる。   According to the configuration of the second aspect, since the throttle is formed on the valve body of the differential pressure valve, the structure of the differential pressure valve can be simplified.

以下、本発明の実施の形態を、添付の図面に示した本発明の実施例に基づいて説明する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

図1〜図6は本発明の一実施例を示すもので、図1は燃料タンクの蒸発燃料放出抑制装置の全体構成を示す図(給油時)、図2は燃料タンクの蒸発燃料放出抑制装置の全体構成を示す図(リークテスト時)、図3は図1の3部拡大断面図、図4は図3の4−4線断面図、図5は図3の5−5線断面図、図6は差圧弁の作用の説明図である。   FIGS. 1 to 6 show an embodiment of the present invention. FIG. 1 is a diagram showing the overall configuration of a fuel tank evaporative fuel release suppression device (when refueling), and FIG. FIG. 3 is an enlarged sectional view of part 3 of FIG. 1, FIG. 4 is a sectional view taken along line 4-4 of FIG. 3, and FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is an explanatory view of the operation of the differential pressure valve.

図1および図2に示すように、自動車の燃料タンクTは、燃料を貯留するタンク本体11と、タンク本体11から斜め上方に延びるフィラーチューブ12と、フィラーチューブ12の上端の給油口12aを開閉するフィラーキャップ13と、タンク本体11からエンジンEに燃料を供給するインタンク式の燃料ポンプ14と、タンク本体11の上部空間を蒸発燃料を吸着するキャニスタ15に接続する第1蒸発燃料通路16と、タンク本体11の上部空間をフィラーチューブ12の給油口12a近傍に接続する第2蒸発燃料通路17と、第2蒸発燃料通路17に設けられた差圧弁18とを備える。キャニスタ15は第3蒸発燃料通路22を介してエンジンEの吸気通路23に接続され、この第3蒸発燃料通路22には第1開閉弁19が設けられる。キャニスタ15の大気に連通するドレンポート20には第2開閉弁21が設けられる。   As shown in FIGS. 1 and 2, the fuel tank T of an automobile opens and closes a tank body 11 that stores fuel, a filler tube 12 that extends obliquely upward from the tank body 11, and a fuel filler port 12 a at the upper end of the filler tube 12. A filler cap 13 that performs fuel supply, an in-tank type fuel pump 14 that supplies fuel from the tank body 11 to the engine E, and a first evaporative fuel passage 16 that connects the upper space of the tank body 11 to a canister 15 that adsorbs evaporated fuel. The second evaporative fuel passage 17 connecting the upper space of the tank main body 11 to the vicinity of the fuel filler opening 12a of the filler tube 12 and the differential pressure valve 18 provided in the second evaporative fuel passage 17 are provided. The canister 15 is connected to an intake passage 23 of the engine E via a third evaporated fuel passage 22, and a first on-off valve 19 is provided in the third evaporated fuel passage 22. A drain port 20 communicating with the atmosphere of the canister 15 is provided with a second on-off valve 21.

第1蒸発燃料通路16がタンク本体11内に開口する部分には、満タン時に上昇した燃料液面により閉弁し、給油ガンのオートストップ装置を作動させるベントシャットフロートバルブ24が設けられる。また第1蒸発燃料通路16から分岐する分岐通路25がタンク本体11内に開口する部分には、燃料タンクTが大きく傾斜したときに閉弁し、タンク本体11内の燃料がキャニスタ15に流入するのを阻止するカットバルブ26が設けられる。更に、前記分岐通路25には、タンク本体11側の圧力がキャニスタ15側の圧力よりも所定値以上高くなると開弁するリリーフバルブ27が設けられる。   In the portion where the first evaporative fuel passage 16 opens into the tank main body 11, a vent shut float valve 24 is provided that is closed by the fuel level that has risen when the tank is full and activates the auto-stop device of the fuel gun. Further, a portion where the branch passage 25 branched from the first evaporative fuel passage 16 opens into the tank body 11 is closed when the fuel tank T is largely inclined, and the fuel in the tank body 11 flows into the canister 15. A cut valve 26 is provided to prevent this. Further, the branch passage 25 is provided with a relief valve 27 that opens when the pressure on the tank body 11 side becomes higher than the pressure on the canister 15 side by a predetermined value or more.

図3〜図5に示すように、差圧弁18は2方向弁の機能を有するもので、弁ハウジング31に摺動自在に支持された第1弁部材32および第2弁部材33を備える。第2弁部材33は、円板状の弁体33aと、弁体33aの一側面から軸方向に突出して弁ハウジング31の内周面に摺動自在に案内される4本の第1ガイド部33b…と、弁本33aの他側面から軸方向に突出する4本の第2ガイド部33c…と、弁体33aの中央を貫通する小径の絞り33dとを備える。第1弁部材32は、円板状の弁体32aと、弁体32aの中央に形成されて第2弁体33の4本の第2ガイド部33c…の外周に軸方向摺動自在に案内されるガイド孔32bと、弁体32aの外周部に形成された4個の切欠32c…とを備える。第1弁部材32は、その弁体32aと第2弁部材33の第2ガイド部33c…の先端との間に配置された第1弁ばね34で第2弁部材33の弁体33aに当接する方向に付勢される。また第1弁部材32の弁体32aは、弁ハウジング31の内周面に設けたばね座31aとの間に配置された第2弁ばね35で、弁ハウジング31の内周面に設けた弁座31bに着座する方向に付勢される。   As shown in FIGS. 3 to 5, the differential pressure valve 18 has a two-way valve function, and includes a first valve member 32 and a second valve member 33 that are slidably supported by the valve housing 31. The second valve member 33 includes a disc-shaped valve body 33a and four first guide portions that protrude in the axial direction from one side surface of the valve body 33a and are slidably guided to the inner peripheral surface of the valve housing 31. 33b, four second guide portions 33c protruding in the axial direction from the other side surface of the valve body 33a, and a small-diameter restrictor 33d penetrating the center of the valve body 33a. The first valve member 32 is formed in the center of the disc-shaped valve body 32a and the four second guide portions 33c of the second valve body 33 so as to be slidable in the axial direction. Guide holes 32b and four notches 32c formed in the outer periphery of the valve body 32a. The first valve member 32 contacts the valve body 33a of the second valve member 33 with a first valve spring 34 disposed between the valve body 32a and the tip of the second guide portion 33c of the second valve member 33. It is energized in the direction of contact. The valve body 32 a of the first valve member 32 is a second valve spring 35 disposed between the valve seat 32 and the spring seat 31 a provided on the inner peripheral surface of the valve housing 31, and the valve seat provided on the inner peripheral surface of the valve housing 31. It is urged in the direction of sitting on 31b.

次に、上記構成を備えた本発明の実施例の作用について説明する。   Next, the operation of the embodiment of the present invention having the above configuration will be described.

図1に示すように、フィラーキャップ13を取り外し、フィラーチューブ12の燃料供給口12aに給油ガン36を挿入して燃料を供給すると、給油ガン36からタンク本体11に供給された燃料の容積に相当する蒸発燃料の一部が第2蒸発燃料通路17から差圧弁18を経て給油口12aの近傍に戻される。給油ガン36から供給される燃料の流量が大きい高速給油時には、差圧弁18の上流側の圧力が下流側の大気圧に比べて充分に高くなるため、図6(A)に示すように、差圧弁18の第2弁部材33および第1弁部材32が一体になって第2弁ばね35を圧縮しながら右動し、第1弁部材32の弁体32aが弁ハウジング31の弁座31bから離間する。   As shown in FIG. 1, when the filler cap 13 is removed and the fuel supply gun 36 is inserted into the fuel supply port 12 a of the filler tube 12 and fuel is supplied, the fuel volume supplied from the fuel supply gun 36 to the tank body 11 is equivalent. A part of the evaporated fuel is returned to the vicinity of the fuel filler opening 12a from the second evaporated fuel passage 17 through the differential pressure valve 18. When the fuel supplied from the fuel gun 36 is at a high flow rate, the pressure on the upstream side of the differential pressure valve 18 is sufficiently higher than the atmospheric pressure on the downstream side. Therefore, as shown in FIG. The second valve member 33 and the first valve member 32 of the pressure valve 18 are integrally moved to the right while compressing the second valve spring 35, and the valve body 32 a of the first valve member 32 is moved from the valve seat 31 b of the valve housing 31. Separate.

その結果、開弁した差圧弁18の弁体32aおよび弁座31bの隙間から第1弁部材32の弁体32aの切欠32c…を通過した大量の蒸発燃料が、タンク本体11側からフィラーチューブ12の給油口12a側に流れることができる。このとき、第2弁部材33の絞り33dを介して一部の蒸発燃料が流れるが、第1、第2弁部材32,33の弁体32aおよび弁座31bの隙間間の隙間を介して流れる蒸発燃料に比べれば微量である。この蒸発燃料は給油ガン36から出る燃料に吸引されてフィラーチューブ12からタンク本体11に戻されることで、給油口12aから大気が吸引されることが防止されてタンク本体11内での新たな蒸発燃料の発生が抑制される。   As a result, a large amount of evaporated fuel that has passed through the notch 32c of the valve body 32a of the first valve member 32 through the gap between the valve body 32a of the differential pressure valve 18 and the valve seat 31b that has been opened is filled from the tank body 11 side with the filler tube 12. It can flow to the fuel filler opening 12a side. At this time, a part of the evaporated fuel flows through the restriction 33d of the second valve member 33, but flows through the gap between the valve body 32a of the first and second valve members 32 and 33 and the valve seat 31b. The amount is very small compared to evaporative fuel. The evaporated fuel is sucked by the fuel exiting from the fuel gun 36 and returned to the tank body 11 from the filler tube 12, thereby preventing the atmosphere from being sucked from the fuel filler opening 12 a, and new evaporation in the tank body 11. Generation of fuel is suppressed.

給油ガン36から供給される燃料の流量が小さい低速給油時には、差圧弁18の上流側および下流側の差圧が小さくなるため、図6(B)に示すように、第2弁ばね35の弾発力で第2弁部材33および第1弁部材32は移動することができない。その結果、閉弁した差圧弁18の弁体33aの絞り33dを通過した小量の蒸発燃料だけがタンク本体11側からフィラーチューブ12の給油口12a側に流れ、給油ガン36から出る燃料による吸引力が小さくても、給油口12aに戻された蒸発燃料をタンク本体11内に吸引してが大気に放散するのを防止することができる。   When the flow rate of the fuel supplied from the fuel gun 36 is low, the differential pressure on the upstream side and the downstream side of the differential pressure valve 18 becomes small. Therefore, as shown in FIG. The second valve member 33 and the first valve member 32 cannot move by the generated force. As a result, only a small amount of evaporated fuel that has passed through the throttle 33d of the valve element 33a of the closed differential pressure valve 18 flows from the tank main body 11 side to the filler opening 12a side of the filler tube 12, and is sucked by the fuel exiting from the fuel gun 36. Even if the force is small, it is possible to prevent the evaporated fuel that has been returned to the fuel filler opening 12a from being sucked into the tank main body 11 and released to the atmosphere.

さて、タンク本体11やフィラーチューブ12に発生するリークを検出する場合には、図2に示すように、キャニスタ15のドレンポート20に設けた第2開閉弁21を閉弁し、第3蒸発燃料通路22に設けた第1開閉弁19を開弁することで、吸気通路23の負圧でタンク本体11内を減圧する。このときフィラーチューブ12の下端が燃料液面下に没してタンク本体11の内部空間およびフィラーチューブ12の内部空間の連通が遮られていても、吸気通路23の負圧がタンク本体11に作用したときに、図6(C)に示すように、差圧弁18の第2弁部材33が第1弁ばね34の弾発力に抗して左動し、その弁体33aが第1弁部材32の弁体32aから離間し、フィラーチューブ12の内部空間の蒸発燃料を含む空気が第1弁体32のガイド孔32b、第1、第2弁部材32,33の弁体32a,33a間の隙間および弁体33aの外周部を介してタンク本体11の内部空間に速やかに吸引され、タンク本体11の内部空間およびフィラーチューブ12の内部空間が同時に減圧される。このとき、第2弁部材33の絞り33dを介して一部の空気が吸引されるが、第1、第2弁部材32,33の弁体32a,33a間の隙間を介して吸引される空気に比べれば微量である。   Now, when detecting leaks occurring in the tank body 11 and the filler tube 12, the second on-off valve 21 provided in the drain port 20 of the canister 15 is closed as shown in FIG. By opening the first on-off valve 19 provided in the passage 22, the inside of the tank body 11 is decompressed by the negative pressure of the intake passage 23. At this time, even if the lower end of the filler tube 12 is submerged below the fuel level and the communication between the internal space of the tank body 11 and the internal space of the filler tube 12 is blocked, the negative pressure of the intake passage 23 acts on the tank body 11. Then, as shown in FIG. 6C, the second valve member 33 of the differential pressure valve 18 moves to the left against the elastic force of the first valve spring 34, and the valve body 33a is moved to the first valve member. The air containing the evaporated fuel in the inner space of the filler tube 12 is separated from the valve body 32a of the first valve body 32 and between the valve bodies 32a and 33a of the first and second valve members 32 and 33. The air is quickly sucked into the internal space of the tank body 11 through the gap and the outer periphery of the valve body 33a, and the internal space of the tank body 11 and the internal space of the filler tube 12 are simultaneously decompressed. At this time, a part of the air is sucked through the throttle 33d of the second valve member 33, but the air sucked through the gap between the valve bodies 32a and 33a of the first and second valve members 32 and 33. It is a trace amount compared to.

続いて、キャニスタ15のドレンポート20に設けた第2開閉弁21を閉弁したまま、第3蒸発燃料通路22に設けた第1開閉弁19を閉弁することでタンク本体11内を密閉し、その内圧の変化を監視する。その結果、時間の経過と共に内圧が増加すればタンク本体11にリークが発生していると判断し、内圧が増加しなければタンク本体11にリークが発生していないと判断することができる。   Subsequently, the tank body 11 is sealed by closing the first on-off valve 19 provided on the third evaporated fuel passage 22 while the second on-off valve 21 provided on the drain port 20 of the canister 15 is closed. Monitor the change in its internal pressure. As a result, if the internal pressure increases with time, it can be determined that a leak has occurred in the tank body 11, and if the internal pressure does not increase, it can be determined that no leak has occurred in the tank body 11.

タンク本体11の内部空間を吸気負圧によって減圧するとき、仮に差圧弁18が開弁する機構を備えておらず、絞り33dだけを介してフィラーチューブ12内の空気がタンク本体11側に吸引されるとすると、フィラーチューブ12の内圧がタンク本体11の内圧まで下がり切る前に内圧の監視が開始されてしまい、フィラーチューブ12内の空気が絞り33dを介して少しずつタンク本体11内に流入するにつれて該タンク本体11の内圧が上昇するため、タンク本体11にリークが発生していると誤認されてしまう可能性がある。   When the internal space of the tank main body 11 is depressurized by the intake negative pressure, there is no provision for the differential pressure valve 18 to open, and the air in the filler tube 12 is sucked into the tank main body 11 only through the throttle 33d. Then, monitoring of the internal pressure is started before the internal pressure of the filler tube 12 drops to the internal pressure of the tank body 11, and the air in the filler tube 12 gradually flows into the tank body 11 through the throttle 33d. As the internal pressure of the tank main body 11 increases, the tank main body 11 may be mistaken for a leak.

それに対し、本実施例によれば、タンク本体11の内部空間を吸気負圧によって減圧するとき、差圧弁18が開弁してフィラーチューブ12の内圧をタンク本体11の内圧と略同じに減少させることができるので、タンク本体11のリークを精度良く検出することができる。   On the other hand, according to this embodiment, when the internal space of the tank body 11 is reduced by the intake negative pressure, the differential pressure valve 18 is opened to reduce the internal pressure of the filler tube 12 to substantially the same as the internal pressure of the tank body 11. Therefore, the leak of the tank body 11 can be detected with high accuracy.

以上、本発明の実施例を説明したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことが可能である。   The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

例えば、差圧弁18の構造は実施例に限定されず、任意の構造の2方向弁を差圧弁18として採用することができる。   For example, the structure of the differential pressure valve 18 is not limited to the embodiment, and a two-way valve having an arbitrary structure can be adopted as the differential pressure valve 18.

また実施例では絞り33dを第2弁部材33の弁体33aに設けているが、差圧弁18のタンク本体11側と給油口12a側とを連通させる任意の位置に絞りを設けることができる。但し、実施例の如く弁体33aに絞り33dを設けることで、差圧弁18の構造を簡素化することができる。   In the embodiment, the throttle 33d is provided in the valve body 33a of the second valve member 33. However, the throttle can be provided at any position where the tank body 11 side and the fuel filler port 12a side of the differential pressure valve 18 communicate with each other. However, the structure of the differential pressure valve 18 can be simplified by providing the throttle 33d in the valve body 33a as in the embodiment.

燃料タンクの蒸発燃料放出抑制装置の全体構成を示す図(給油時)The figure which shows the whole structure of the evaporative fuel emission suppression device of a fuel tank (at the time of fueling) 燃料タンクの蒸発燃料放出抑制装置の全体構成を示す図(リークテスト時)Diagram showing the overall configuration of the evaporative fuel emission suppression device for the fuel tank (during a leak test) 図1の3部拡大断面図3 is an enlarged sectional view of part 3 in FIG. 図3の4−4線断面図Sectional view taken along line 4-4 in FIG. 図3の5−5線断面図Sectional view along line 5-5 in FIG. 差圧弁の作用の説明図Illustration of the action of the differential pressure valve

11 タンク本体
12 フィラーチューブ
12a 給油口
15 キャニスタ
16 第1蒸発燃料通路
17 第2蒸発燃料通路
18 差圧弁
33a 弁体
33d 絞り
エンジン
11 Tank body 12 Filler tube 12a Refueling port 15 Canister 16 First evaporative fuel passage 17 Second evaporative fuel passage 18 Differential pressure valve 33a Valve element 33d Restriction
E engine

Claims (2)

タンク本体(11)およびキャニスタ(15)を接続する第1蒸発燃料通路(16)と、タンク本体(11)およびフィラーチューブ(12)の給油口(12a)を接続する第2蒸発燃料通路(17)と、第2蒸発燃料通路(17)に設けられた差圧弁(18)とを備え、前記差圧弁(18)は給油口(12a)側およびタンク本体(11)側を常時連通させる絞り(33d)を有する燃料タンクの蒸発燃料放出抑制装置において、
前記差圧弁(18)は、燃料をフィラーチューブ(12)に供給する際には、タンク本体(11)側が給油口(12a)側よりも所定値以上高圧のときに開弁してタンク本体(11)から押し出された蒸発燃料の一部を第2蒸発燃料通路(17)を介して給油口(12a)に戻すとともに、エンジン(E)の吸気負圧を第1蒸発燃料通路(16)を介してタンク本体(11)に作用させて該タンク本体(11)の内部空間を減圧する際には、給油口(12a)側がタンク本体(11)側よりも所定値以上高圧のときに開弁してフィラーチューブ(12)の内部空間を第2蒸発燃料通路(17)を介して減圧する2方向弁であことを特徴とする燃料タンクの蒸発燃料放出抑制装置。
A first evaporative fuel passage (16) connecting the tank body (11) and the canister (15), and a second evaporative fuel passage (17) connecting the tank body (11) and the filler port (12a) of the filler tube (12). a), and a differential pressure valve provided in the second evaporative fuel path (17) (18), the differential pressure valve (18) is the fuel supply port (12a) side and the tank body (11) side an aperture for always communicated ( 33d) a fuel tank evaporative fuel emission suppressing device,
The differential pressure valve (18), when supplying fuel to the filler tube (12) includes a tank main body (11) side is opened to the tank body when the pressure over a predetermined value than the fuel supply port (12a) side ( 11) A part of the evaporated fuel pushed out from 11) is returned to the fuel filler port (12a) through the second evaporated fuel passage (17), and the intake negative pressure of the engine (E) is reduced in the first evaporated fuel passage (16). When the inner space of the tank body (11) is depressurized by acting on the tank body (11) through the valve body, the valve opening is opened when the oil filler (12a) side is higher than the tank body (11) side by a predetermined value or more. to vapor fuel discharge suppressing device for a fuel tank, characterized in that the inner space Ru 2-way valve der to reduce the pressure through the second evaporative fuel path (17) of the filler tube (12).
前記絞り(33d)を差圧弁(18)の弁体(33a)に形成したことを特徴とする、請求項1に記載の燃料タンクの蒸発燃料放出抑制装置。   The evaporative fuel emission suppression device for a fuel tank according to claim 1, wherein the throttle (33d) is formed in a valve body (33a) of a differential pressure valve (18).
JP2005302756A 2005-10-18 2005-10-18 Evaporative fuel emission suppression device for fuel tank Expired - Fee Related JP4638319B2 (en)

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JP5704952B2 (en) * 2011-02-14 2015-04-22 株式会社ディスコ Air spindle unit
CN109611590B (en) * 2019-01-24 2023-11-28 安徽尼威汽车动力系统有限公司 Oil tank isolation valve

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JPH09256923A (en) * 1996-03-21 1997-09-30 Nissan Motor Co Ltd Fuel tank device
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Publication number Priority date Publication date Assignee Title
US8950616B2 (en) 2012-12-21 2015-02-10 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Closed fuel tank system

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