JPH04119351U - Fuel evaporation control device - Google Patents
Fuel evaporation control deviceInfo
- Publication number
- JPH04119351U JPH04119351U JP2421491U JP2421491U JPH04119351U JP H04119351 U JPH04119351 U JP H04119351U JP 2421491 U JP2421491 U JP 2421491U JP 2421491 U JP2421491 U JP 2421491U JP H04119351 U JPH04119351 U JP H04119351U
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- fuel tank
- valve
- canister
- way valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 62
- 230000008020 evaporation Effects 0.000 title claims description 11
- 238000001704 evaporation Methods 0.000 title claims description 11
- 239000002828 fuel tank Substances 0.000 claims abstract description 57
- 230000001629 suppression Effects 0.000 claims 2
- 239000000945 filler Substances 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
(57)【要約】
［目的］ 燃料タンクのフィラーキャップを開放した時
に燃料蒸気が該燃料タンクの内圧で大気に放出されるこ
とを防止するとともに、燃料供給時に燃料タンク内部の
燃料がキャニスタに流入することを防止する。
［構成］ 燃料タンクＴとエンジンＥの吸気管１を接続
するパイプ７1 〜７3 に燃料蒸気を吸着するキャニスタ
９とツーウエイバルブ８を介装する。前記ツーウエイバ
ルブ８をバイパスするパイプ７4 ，７5 にソレノイドで
駆動される開閉弁１１を設ける。通常は開閉弁１１が開
かれていてツーウエイバルブ８は実質的に機能しない
が、フィラーキャップ１３を取り外して給油ガンで燃料
供給を行う時に、開閉弁１１が閉弁されてツーウエイバ
ルブ９が機能する。
(57) [Summary] [Purpose] To prevent fuel vapor from being released into the atmosphere due to the internal pressure of the fuel tank when the filler cap of the fuel tank is opened, and to prevent the fuel inside the fuel tank from flowing into the canister when supplying fuel. prevent [Structure] A canister 9 for adsorbing fuel vapor and a two-way valve 8 are interposed in the pipes 7 1 to 7 3 that connect the fuel tank T and the intake pipe 1 of the engine E. An on-off valve 11 driven by a solenoid is provided in the pipes 7 4 and 7 5 that bypass the two-way valve 8. Normally, the on-off valve 11 is open and the two-way valve 8 does not substantially function, but when the filler cap 13 is removed and fuel is supplied with a fuel gun, the on-off valve 11 is closed and the two-way valve 9 functions. .
Description
【０００１】0001
本考案は、燃料タンクの上部空間とエンジンの吸気管を接続する通路に蒸発燃 料を吸着するキャニスタを設け、前記通路における燃料タンクとキャニスタ間に 、燃料タンクの内圧が大気圧を所定値上回った場合に開弁し、かつ前記内圧が大 気圧を所定値下回った場合に開弁するツーウエイバルブを介装してなる燃料蒸発 抑制装置に関する。 This invention uses evaporative combustion in the passage connecting the upper space of the fuel tank and the engine intake pipe. A canister that adsorbs fuel is provided between the fuel tank and the canister in the passage. , the valve opens when the internal pressure of the fuel tank exceeds the atmospheric pressure by a predetermined value, and the internal pressure is large. Fuel evaporation with a two-way valve that opens when the atmospheric pressure drops below a predetermined value Relating to a suppressor.
【０００２】0002
かかる燃料蒸発抑制装置は、例えば特開昭５５−１５４２５１号公報により公 知である。 Such a fuel evaporation suppressing device is disclosed, for example, in Japanese Patent Laid-Open No. 154251/1983. It is knowledge.
【０００３】 ところで、この様な燃料蒸発抑制装置では、ツーウエイバルブに設定された開 弁圧力により燃料タンクの内部が加圧された状態にあると、燃料を供給すべく燃 料タンクのフィラーキャップを取り外した時に燃料供給口から内部の燃料蒸気が 大気中に放出される場合がある。かかる不都合を回避するために前記公報に記載 された従来の燃料蒸発抑制装置は、ツーウエイバルブと並列に設けた開閉弁を燃 料タンクのフィラーキャップを取り外すと同時に開弁してツーウエイバルブを無 効化し、燃料タンクの内圧を大気圧まで減圧して燃料供給口から燃料蒸気が大気 中に放出されることを防止している。0003 By the way, in this kind of fuel evaporation control device, the opening set on the two-way valve is When the inside of the fuel tank is pressurized due to the valve pressure, the fuel tank is turned off to supply fuel. When the filler cap of the fuel tank is removed, internal fuel vapor leaks from the fuel supply port. May be released into the atmosphere. In order to avoid such inconvenience, Conventional fuel evaporation control devices, which have been Remove the filler cap from the fuel tank and open the valve at the same time to eliminate the two-way valve. The internal pressure of the fuel tank is reduced to atmospheric pressure, and fuel vapor is released from the fuel supply port into the atmosphere. This prevents it from being released into the air.
【０００４】0004
しかしながら上記従来の燃料蒸発抑制装置は、給油ガンで燃料タンクに燃料を 供給する際に開弁状態にある開閉弁を通って燃料がキャニスタに流入し、その機 能を損なう可能性がある。 However, the conventional fuel evaporation control device described above does not allow fuel to be filled into the fuel tank with a fuel gun. Fuel flows into the canister through the on-off valve that is open when being supplied, and the fuel flows into the canister. may impair performance.
【０００５】 本考案は前述の事情に鑑みてなされたもので、燃料タンクのフィラーキャップ 開放時に燃料蒸気の漏れを防止することが可能であり、しかも給油時に燃料がキ ャニスタに流入する虞れが無い燃料蒸発抑制装置を提供することを目的とする。[0005] This invention was made in view of the above-mentioned circumstances, and is a fuel tank filler cap. It is possible to prevent fuel vapor from leaking when opened, and it also prevents fuel from leaking when refueling. An object of the present invention is to provide a fuel evaporation suppressing device that has no risk of fuel flowing into a canister.
【０００６】[0006]
前記目的を達成するために、本考案は、燃料タンクの上部空間とエンジンの吸 気管を接続する通路に蒸発燃料を吸着するキャニスタを設け、前記通路における 燃料タンクとキャニスタ間に、燃料タンクの内圧が大気圧を所定値上回った場合 に開弁し、かつ前記内圧が大気圧を所定値下回った場合に開弁するツーウエイバ ルブを介装してなる燃料蒸発抑制装置において、燃料タンクとキャニスタを結ぶ 前記通路に、燃料タンクへの燃料供給時に閉弁可能な常開の開閉弁を前記ツーウ エイバルブと並列に接続したことを特徴とする。 In order to achieve the above object, the present invention aims to improve the upper space of the fuel tank and the intake of the engine. A canister that adsorbs evaporated fuel is provided in the passage connecting the trachea, and When the internal pressure of the fuel tank exceeds the atmospheric pressure by a specified value between the fuel tank and the canister. A two-way valve that opens when the internal pressure falls below atmospheric pressure by a predetermined value. Connects the fuel tank and canister in a fuel evaporation control device using a lubricant. A normally open on-off valve that can be closed when fuel is supplied to the fuel tank is installed in the passageway. It is characterized by being connected in parallel with the A-valve.
【０００７】[0007]
以下、図面に基づいて本考案の実施例を説明する。 Embodiments of the present invention will be described below based on the drawings.
【０００８】 図に示すように、内燃機関Ｅの吸気管１にはエアクリーナ２、燃料供給装置３ 、およびスロットルバルブ４が設けられ、燃料タンクＴ内部の燃料は燃料供給用 のパイプ５1 ，５2 に介装した燃料ポンプ６により燃料供給装置３に供給される 。As shown in the figure, the intake pipe 1 of the internal combustion engine E is provided with an air cleaner 2, a fuel supply device 3, and a throttle valve 4, and the fuel inside the fuel tank T is supplied through fuel supply pipes 51 , 5. The fuel is supplied to the fuel supply device 3 by a fuel pump 6 installed in the fuel pump 2 .
【０００９】 燃料タンクＴの上部空間と前記吸気管１はキャニスタ用のパイプ７1 ，７2 ， ７3 により接続され、パイプ７1 ，７2 間にはツーウエイバルブ８が介装される とともに、パイプ７2 ，７3 間にはキャニスタ９が介装される。The upper space of the fuel tank T and the intake pipe 1 are connected by canister pipes 7 1 , 7 2 , 7 3 , and a two-way valve 8 is interposed between the pipes 7 1 , 7 2 . A canister 9 is interposed between the pipes 7 2 and 7 3 .
【００１０】 ツーウエイバルブ８は２個のリリーフ弁を組み合わせた構造を持ち、燃料タン クＴの内圧が大気圧を所定値上回った場合、および燃料タンクＴの内圧が大気圧 を所定値下回った場合に該燃料タンクＴとキャニスタ９を相互に連通させる。ま た、キャニスタ９は上下のフィルタ間に活性炭を収納したもので、前記通路７2 が活性炭の内部に開口するとともに、前記通路７3 が上側のフィルタの上部空間 に開口し、更に下側のフィルタの下部空間が大気開放口９1 を介して大気に連通 する。The two-way valve 8 has a structure in which two relief valves are combined, and when the internal pressure of the fuel tank T exceeds atmospheric pressure by a predetermined value, and when the internal pressure of the fuel tank T falls below atmospheric pressure by a predetermined value, The fuel tank T and canister 9 are made to communicate with each other. In addition, the canister 9 stores activated carbon between the upper and lower filters, and the passage 7 2 opens inside the activated carbon, and the passage 7 3 opens into the upper space of the upper filter, and the passage 7 3 opens into the upper space of the upper filter. The lower space communicates with the atmosphere through the atmosphere opening 91 .
【００１１】 ツーウエイバルブ８の前後に延びるパイプ７1 ，７2 からは他のパイプ７4 ， ７5 が分岐し、それら両パイプ７4 ，７5 間には制御装置１０に接続されてソレ ノイドで駆動される開閉弁１１が介装される。すなわち燃料タンクＴとキャニス タ９の間には、前記ツーウエイバルブ８と開閉弁１１が並列に設けられる。通常 の状態において開閉弁１１は開弁状態に保持されるが、例えば燃料タンクＴの燃 料供給管１２の上端に設けたフィラーキャップ１３の着脱を検出するセンサの出 力信号により、そのフィラーキャップ１３が取り外される燃料供給中に閉弁制御 される。Other pipes 7 4 and 7 5 branch from the pipes 7 1 and 7 2 extending before and after the two-way valve 8, and a solenoid is connected to the control device 10 between the two pipes 7 4 and 7 5 . A driven on-off valve 11 is interposed. That is, between the fuel tank T and the canister 9, the two-way valve 8 and the on-off valve 11 are provided in parallel. In normal conditions, the on-off valve 11 is kept open, but for example, the filler cap 13 may be opened by an output signal from a sensor that detects attachment or detachment of the filler cap 13 provided at the upper end of the fuel supply pipe 12 of the fuel tank T. The valve is controlled to close during the fuel supply being removed.
【００１２】 次に、前述の構成を備えた本考案の実施例の作用を説明する。0012 Next, the operation of the embodiment of the present invention having the above-described configuration will be explained.
【００１３】 燃料タンクＴのフィラーキャップ１３が閉じられている通常の状態では、切換 弁１１は開弁状態にあってツーウエイバルブ８は実質的に機能せず、燃料タンク Ｔとキャニスタ９はパイプ７1 ，７4 、開かれた開閉弁１１、およびパイプ７5 ，７2 を介して相互に連通する。したがって燃料タンクＴの温度が上昇して内部 の燃料が蒸発すると、燃料蒸気は前記開閉弁１１からキャニスタ９に達して活性 炭に吸着され、その燃料蒸気の外部への漏れが防止される。これと同時に燃料タ ンクＴの内圧がキャニスタ９の大気開放口９1 から外部に逃がされ、該燃料タン クＴ内部の圧力上昇が防止される。また燃料タンクＴの温度が低下すると、前述 とは逆の経路で燃料タンクＴの内部に外気が導入され、燃料タンクＴの内部に負 圧が発生することが防止される。更に内燃機関Ｅの運転中には吸気管１に負圧が 発生するため、キャニスタ９の大気開放口９1 から導入された大気がパイプ７3 を介して吸気管１に吸引され、その際にキャニスタ９の活性炭に吸着されていた 燃料蒸気がパージされて吸気管１に供給される。In a normal state in which the filler cap 13 of the fuel tank T is closed, the switching valve 11 is in an open state and the two-way valve 8 does not substantially function, and the fuel tank T and canister 9 are connected to the pipe 7. 1 , 7 4 , the opened on-off valve 11 and pipes 7 5 , 7 2 communicate with each other. Therefore, when the temperature of the fuel tank T rises and the fuel inside evaporates, the fuel vapor reaches the canister 9 from the on-off valve 11 and is adsorbed by the activated carbon, thereby preventing the fuel vapor from leaking to the outside. At the same time, the internal pressure of the fuel tank T is released to the outside from the atmosphere opening 91 of the canister 9, and the pressure inside the fuel tank T is prevented from increasing. Further, when the temperature of the fuel tank T decreases, outside air is introduced into the fuel tank T through a path opposite to that described above, and negative pressure is prevented from being generated inside the fuel tank T. Furthermore, since negative pressure is generated in the intake pipe 1 while the internal combustion engine E is operating, the atmosphere introduced from the atmosphere opening 9 1 of the canister 9 is sucked into the intake pipe 1 via the pipe 7 3 . The fuel vapor adsorbed on the activated carbon in the canister 9 is purged and supplied to the intake pipe 1.
【００１４】 上述のように常開の開閉弁１１の作用で燃料タンクＴの内圧が常時大気圧に保 たれるので、燃料タンクＴに燃料を供給すべくフィラーキャップ１３を取り外し ても、その燃料タンクＴ内部の燃料蒸気が燃料供給管１２から外部に放出される ことが防止される。[0014] As mentioned above, the internal pressure of the fuel tank T is always maintained at atmospheric pressure by the action of the normally open on-off valve 11. Remove the filler cap 13 to supply fuel to the fuel tank T. However, the fuel vapor inside the fuel tank T is released from the fuel supply pipe 12 to the outside. This will be prevented.
【００１５】 また、燃料タンクＴのフィラーキャップ１３を取り外すと制御装置１０により 開閉弁１１が閉じられるので、燃料タンクＴとキャニスタ９はツーウエイバルブ ８を介して連通する。そしてツーウエイバルブ８は燃料タンクＴの内圧が予め設 定された圧力を越えるまでは開弁しないため、給油ガンにより燃料タンクＴに燃 料を供給する際に燃料タンクＴ内部の燃料はツーウエイバルブ８に阻止されてキ ャニスタ９に流入することが防止される。[0015] Also, when the filler cap 13 of the fuel tank T is removed, the control device 10 Since the on-off valve 11 is closed, the fuel tank T and canister 9 are two-way valves. 8. The two-way valve 8 is set to the internal pressure of the fuel tank T in advance. Since the valve does not open until the specified pressure is exceeded, the fuel tank T is filled with fuel by the refueling gun. When supplying fuel, the fuel inside the fuel tank T is blocked by the two-way valve 8 and This prevents the liquid from flowing into the canister 9.
【００１６】 而して、上記効果を高めるべくツーウエイバルブ８の開弁圧力を高めに設定し ても、通常は開閉弁１１により燃料タンクＴとキャニスタ９が連通して燃料タン クＴの内圧が大気圧に保持されるため、燃料タンクＴのシール部分からの燃料蒸 気の漏れを減少させることができる。[0016] Therefore, in order to enhance the above effect, the opening pressure of the two-way valve 8 is set high. However, normally, the fuel tank T and canister 9 are communicated with each other by the on-off valve 11. Since the internal pressure of the fuel tank T is maintained at atmospheric pressure, fuel vapor from the seal part of the fuel tank T Can reduce air leakage.
【００１７】 なお、実施例では燃料タンクＴのフィラーキャップ１３の着脱を検出して開閉 弁１１を操作しているが、フィラーリッドの開閉を検出して開閉弁１１を操作す ることも可能である。[0017] In addition, in the embodiment, opening/closing is performed by detecting attachment/detachment of the filler cap 13 of the fuel tank T. The valve 11 is being operated, but the opening/closing of the filler lid is detected and the opening/closing valve 11 is operated. It is also possible to
【００１８】[0018]
以上のように本考案によれば、燃料タンクへの燃料供給が行われていない通常 の状態では、ツーウエイバルブをバイパスする開閉弁が開いて燃料タンクの内圧 が常に大気圧に保たれるため、燃料タンクのシール部分からの燃料蒸気の漏れを 減少させることが可能になるばかりか、燃料供給のために燃料タンクのフィラー キャップを取り外した際に、内部の燃料蒸気が燃料タンクの内圧で大気に放出さ れる不都合が回避される。しかも、燃料タンクに燃料を供給する際には開閉弁が 閉じてツーウエイバルブが機能するため、燃料タンク内部の燃料がキャニスタに 流入する不都合を回避することができる。 As described above, according to the present invention, when fuel is not supplied to the fuel tank normally In this condition, the on-off valve that bypasses the two-way valve opens and reduces the internal pressure of the fuel tank. is always maintained at atmospheric pressure, preventing fuel vapor from leaking from the fuel tank seal. Fuel tank filler makes it possible to reduce as well as fuel supply When the cap is removed, the fuel vapor inside will be released to the atmosphere due to the internal pressure of the fuel tank. This avoids the inconvenience caused by Moreover, when supplying fuel to the fuel tank, there is no on-off valve. The two-way valve functions when closed, allowing fuel inside the fuel tank to flow into the canister. The inconvenience of inflow can be avoided.
【図１】本考案の一実施例による燃料蒸発抑制装置を示
す図[Fig. 1] A diagram showing a fuel evaporation suppressing device according to an embodiment of the present invention.
８・・・ツーウエイバルブ ９・・・キャニスタ １１・・開閉弁 Ｅ・・・エンジン Ｔ・・・燃料タンク 8...Two-way valve 9...Canister 11...Opening/closing valve E...Engine T...Fuel tank
Claims (1)
（Ｅ）の吸気管（１）を接続する通路に蒸発燃料を吸着
するキャニスタ（９）を設け、前記通路における燃料タ
ンク（Ｔ）とキャニスタ（９）間に、燃料タンク（Ｔ）
の内圧が大気圧を所定値上回った場合に開弁し、かつ前
記内圧が大気圧を所定値下回った場合に開弁するツーウ
エイバルブ（８）を介装してなる燃料蒸発抑制装置にお
いて、燃料タンク（Ｔ）とキャニスタ（９）を結ぶ前記
通路に、燃料タンク（Ｔ）への燃料供給時に閉弁可能な
常開の開閉弁（１１）を前記ツーウエイバルブ（８）と
並列に接続したことを特徴とする、燃料蒸発抑制装置。1. A canister (9) for adsorbing evaporated fuel is provided in a passage connecting the upper space of the fuel tank (T) and the intake pipe (1) of the engine (E), and Between the canisters (9), the fuel tank (T)
A fuel evaporation suppression device comprising a two-way valve (8) that opens when the internal pressure of the fuel cell exceeds atmospheric pressure by a predetermined value and opens when the internal pressure of the fuel cell becomes lower than atmospheric pressure by a predetermined value. A normally open on-off valve (11) that can be closed when fuel is supplied to the fuel tank (T) is connected in parallel to the two-way valve (8) to the passage connecting the tank (T) and the canister (9). A fuel evaporation suppression device featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2421491U JP2529282Y2 (en) | 1991-04-12 | 1991-04-12 | Fuel evaporation suppression device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2421491U JP2529282Y2 (en) | 1991-04-12 | 1991-04-12 | Fuel evaporation suppression device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04119351U true JPH04119351U (en) | 1992-10-26 |
| JP2529282Y2 JP2529282Y2 (en) | 1997-03-19 |
Family
ID=31909218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2421491U Expired - Fee Related JP2529282Y2 (en) | 1991-04-12 | 1991-04-12 | Fuel evaporation suppression device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2529282Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022001472A (en) * | 2020-06-22 | 2022-01-06 | 日立Astemo株式会社 | Vehicular electronic control device |
-
1991
- 1991-04-12 JP JP2421491U patent/JP2529282Y2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022001472A (en) * | 2020-06-22 | 2022-01-06 | 日立Astemo株式会社 | Vehicular electronic control device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2529282Y2 (en) | 1997-03-19 |
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