JPS6014916Y2 - Fuel tank internal pressure control device - Google Patents
Fuel tank internal pressure control deviceInfo
- Publication number
- JPS6014916Y2 JPS6014916Y2 JP453579U JP453579U JPS6014916Y2 JP S6014916 Y2 JPS6014916 Y2 JP S6014916Y2 JP 453579 U JP453579 U JP 453579U JP 453579 U JP453579 U JP 453579U JP S6014916 Y2 JPS6014916 Y2 JP S6014916Y2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- fuel tank
- tank
- canister
- internal pressure
- 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.)
- Expired
Links
Landscapes
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Description
【考案の詳細な説明】
本考案は、燃料タンク上部に気室を形成し、タンク内の
燃料蒸気をキャニスタを介して排出するようにした内燃
機関の燃料系統における燃料タンク内圧制御装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel tank internal pressure control device for a fuel system of an internal combustion engine, which has an air chamber formed in the upper part of the fuel tank and discharges fuel vapor in the tank through a canister.
燃料タンク上部の燃料蒸気を排出するにあたって、排気
規制の観点から、キャニスタに燃料蒸気を吸着させた後
排出するようにしである。In order to discharge the fuel vapor from the upper part of the fuel tank, from the viewpoint of emission regulations, the fuel vapor is adsorbed in the canister and then discharged.
しかし、一般に燃料タンクの給油口はキャニスタより高
い位置にあるので、燃料を給油口まで満たした場合、そ
の重力差でキャニスタまで燃料が流れ込むこととなる。However, since the filler port of the fuel tank is generally located at a higher position than the canister, when the filler port is filled with fuel, the difference in gravity causes the fuel to flow into the canister.
このため、従来から、燃料タンクとキャニスタとを結ぶ
燃料蒸気排出経路の途中にチェックバルブ(通常は燃料
タンクの内圧が300mAg以上になったとき開く一方
弁)を設け、更に、燃料タンク上部に気室を形成して、
満タン時でも燃料がキャニスタへ流れ出さないようにし
である。For this reason, a check valve (usually a one-way valve that opens when the internal pressure of the fuel tank exceeds 300 mAg) has been installed in the middle of the fuel vapor exhaust path connecting the fuel tank and the canister, and a check valve has been installed in the upper part of the fuel tank. form a chamber,
This prevents fuel from flowing into the canister even when the tank is full.
しかし、このようなチェックバルブを設置したために、
燃料タンク内部及び燃料パイプ中に内圧が作用している
。However, by installing such a check valve,
Internal pressure is acting inside the fuel tank and fuel pipe.
夏期や高負荷運転後のエンジンルーム内の温度が高温の
状態でエンジンを停止すると、エンジンの再始動が困難
になる場合が多いが、これは気化器フロート室よりの燃
料が蒸発してエアーベントを通って吸気路内に溜ったり
、気化器内の燃料通路内からパーコレーションが発生し
吸気マニホルド内に飛び出すことからもその原因になる
。If you stop the engine in the summer or after high-load operation when the temperature inside the engine compartment is high, it is often difficult to restart the engine, but this is because fuel from the carburetor float chamber evaporates and the air vent This can also be caused by percolation occurring from within the fuel passage in the carburetor and jumping out into the intake manifold.
しかし再始動性を困難にする最も大きな要因は、気化器
と燃料タンクとの間の燃料パイプがエンジン停止時に加
熱されこの間の燃料が気化しかつフロート室内の燃料が
蒸発してフロート室レベルが下るので、燃料パイプや燃
料タンク内の燃料蒸気が、タンク内圧や気化した時の体
積変化による圧力でフロート室に押込まれエアーベント
パイプより吸気マニホルド内に送り込まれることによる
。However, the biggest factor that makes restartability difficult is that the fuel pipe between the carburetor and the fuel tank gets heated when the engine is stopped, and the fuel vaporizes during this time, and the fuel in the float chamber evaporates, causing the float chamber level to drop. Therefore, the fuel vapor in the fuel pipe or fuel tank is pushed into the float chamber by the pressure caused by the tank internal pressure or the volume change when vaporized, and is sent into the intake manifold through the air vent pipe.
そこで、燃料タンク内圧を開放状態にすれば上記不具合
は解消できる。Therefore, the above-mentioned problem can be solved by opening the internal pressure of the fuel tank.
しかし、チェックバルブを取外しタンク内圧を常時開放
状態とする場合は、給油でタンクを満タンにした場合に
燃料がキャニスタに流れ込む不具合を生ずる。However, if the check valve is removed and the internal pressure of the tank is kept open at all times, fuel will flow into the canister when the tank is filled with refueling.
本考案はこのような予備を解決するもので、燃料タンク
の内圧を制御することによりエンジンの高温時再始動性
を改善すると共に燃料がキャニスタ内へ流入するのを防
止することを目的とする。The present invention solves this problem and aims to improve restartability of the engine at high temperatures by controlling the internal pressure of the fuel tank and to prevent fuel from flowing into the canister.
以下、添付図面を参照して本考案の実施例につき詳細に
説明する。Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
第1図は比較例として示すもので、1は燃料タンク、2
は燃料タンクとキャニスタ3とを結ぶ燃料蒸気排出経路
、4は気化器、5はフロート室、6は燃料供給パイプ、
7は燃料ポンプ、8は燃料バイブロの途中に発生した燃
料蒸気を燃料タンク1へ戻すリターンパイプである。Figure 1 is shown as a comparative example, where 1 is a fuel tank, 2 is a fuel tank, and 2 is a fuel tank.
is a fuel vapor discharge path connecting the fuel tank and canister 3, 4 is a carburetor, 5 is a float chamber, 6 is a fuel supply pipe,
7 is a fuel pump, and 8 is a return pipe for returning fuel vapor generated during the fuel vibro to the fuel tank 1.
本考案では、燃料タンク1とキャニスタ3とを結ぶ燃料
蒸気排出経路2の途中に、従来のチェックバルブの代わ
りに、燃料タンク1の給油口即ち燃料タンクキャップ1
3が閉じているとき開きこのキャップ13が開いている
とき閉じる開閉弁9を設けた。In the present invention, instead of a conventional check valve, a fuel filler port of the fuel tank 1, that is, a fuel tank cap 1 is installed in the middle of the fuel vapor discharge path 2 connecting the fuel tank 1 and the canister 3.
An on-off valve 9 is provided which opens when the cap 3 is closed and closes when the cap 13 is open.
第1図の比較例では、この開閉弁9を電磁弁で構成する
と共に、燃料タンクキャップ13と連動するスイッチ1
0を燃料タンク1に設け、キャップ13を開いた時即ち
給油中はスイッチ10が閉じて通電し電磁弁9が燃料蒸
気排出通路2を途中で遮断するように構成する。In the comparative example shown in FIG.
0 is provided in the fuel tank 1, and when the cap 13 is opened, that is, during refueling, the switch 10 is closed and energized, and the solenoid valve 9 cuts off the fuel vapor discharge passage 2 midway.
勿論、スイッチ10はその電気接点からの火花などが燃
料蒸気に引火しない防爆構造とする必要がある。Of course, the switch 10 needs to have an explosion-proof structure so that sparks from its electrical contacts will not ignite the fuel vapor.
第1図の比較例では、スイッチ10を図示のようなピボ
ットアームで構成し、その一端を燃料タンク1内でキャ
ップ13に当接可能ならしめ、他端を燃料タンク1の外
部に延長して電気接点を構成した。In the comparative example shown in FIG. 1, the switch 10 is constituted by a pivot arm as shown, one end of which can come into contact with the cap 13 inside the fuel tank 1, and the other end extended outside the fuel tank 1. Constructed electrical contacts.
第2図は本考案の実施例を示すもので、燃料タンクキャ
ップ13′の開放により作動し燃料蒸気排出°通路2′
の遮断を機械的に行なう開閉弁11を燃料給油口の近く
に設置した例を示している。FIG. 2 shows an embodiment of the present invention, which is activated by opening the fuel tank cap 13'.
An example is shown in which an on-off valve 11 that mechanically shuts off is installed near a fuel filler port.
すなわち、第2図の実施例では、ピボットアームの一端
を第1図の比較例と同様に燃料タンク1内でキャップ1
3′に当接可能ならしめ、タンク外部のピボットアーム
他端で直接通路2′を開閉させる構造とした。That is, in the embodiment shown in FIG. 2, one end of the pivot arm is attached to the cap 1 within the fuel tank 1, similar to the comparative example shown in FIG.
3', and the other end of the pivot arm outside the tank directly opens and closes the passage 2'.
本考案によると、給油中即ち燃料タンクキャップ13.
13’が開放されている間は、燃料蒸気排出経路2,2
′が遮断されているので、給油口上端付近まで燃料が給
油された場合でも燃料タンク1の上部に空間気室14が
残され、キャニスタ3に液状燃料が流れ込むことはない
。According to the present invention, during refueling, that is, the fuel tank cap 13.
13' is open, the fuel vapor exhaust paths 2, 2
' is blocked, so even if fuel is filled to the vicinity of the upper end of the fuel filler port, a space air chamber 14 remains in the upper part of the fuel tank 1, and liquid fuel does not flow into the canister 3.
また、燃料タンクキャップ13.13’が閉じられ、燃
料蒸気排出通路2,2′が開いた場合でも、従来と同じ
く燃料タンク1の上部に空間気室14が残されているの
で、車輛が多少傾斜してもキャニスタ3へ燃料蒸気が流
れ込まない。Furthermore, even when the fuel tank cap 13, 13' is closed and the fuel vapor discharge passages 2, 2' are opened, the space air chamber 14 remains in the upper part of the fuel tank 1, as in the conventional case, so that the vehicle Fuel vapor does not flow into the canister 3 even if it is tilted.
さらに、問題とする高温時には、燃料バイブロ及び燃料
リターンパイプ8より発生した燃料蒸気や燃料タンク1
より発生した燃料蒸気は、開放弁9,11が開放されて
いるのでパイプ中の圧力が上らずキャニスタ3へ吸収さ
れる。Furthermore, at high temperatures, fuel vapor generated from the fuel vibro and fuel return pipe 8 and fuel tank 1
Since the release valves 9 and 11 are open, the fuel vapor generated by the fuel vapor is absorbed into the canister 3 without increasing the pressure in the pipe.
このため、高温状態でエンジンを停止した場合でも、燃
料パイプ中や燃料タンク1に発生した燃料蒸気がキャブ
レタ4を通じてエンジン内に流れ込まず、エンジンの再
始動時に混合気が過濃になるのを防止する。Therefore, even if the engine is stopped in a high temperature state, fuel vapor generated in the fuel pipe or fuel tank 1 will not flow into the engine through the carburetor 4, preventing the mixture from becoming too rich when the engine is restarted. do.
このため、高温時のエンジン再始動性が向上する。Therefore, engine restartability at high temperatures is improved.
因みに、高温停止時に、吸気マニホルド内に溜まる燃料
蒸気の量は、気化器フロート室からのものが約30%、
燃料タンクやタンク内圧によるものが約60%、残り約
10%が気化器通路の液状燃料の蒸発によるもので、本
考案の燃料タンク内圧制御装置は高温時の再始動性を改
善する上で有効なものであることが示される。Incidentally, during a high-temperature shutdown, approximately 30% of the fuel vapor that accumulates in the intake manifold comes from the carburetor float chamber.
Approximately 60% of this is due to the fuel tank and tank internal pressure, and the remaining 10% is due to evaporation of liquid fuel in the carburetor passage, so the fuel tank internal pressure control device of this invention is effective in improving restartability at high temperatures. It is shown that it is a thing.
本考案によれば、機械式の開閉弁11を使用しているの
で安価であるだけでなく、電気的な手段を用いた場合の
ように電気接点の火花の発生による燃料への引火等の問
題を引起す心配はまったくない。According to the present invention, since the mechanical on-off valve 11 is used, it is not only inexpensive, but also has the problem of ignition of fuel due to sparks generated from electrical contacts, unlike when using electrical means. There is no need to worry about causing this.
第1図は本考案の比較例を示す概略図、第2図は本考案
の実施例で第1図の比較例と異なる部分のみを示したも
のである。
1・・・・・・燃料タンク、2・・・・・・燃料蒸気排
出経路、3・・・・・・キャニスタ、9,11・・・・
・・開閉弁、13゜13′・・・・・・給油口(キャッ
プ)、14・・・・・・気室。FIG. 1 is a schematic diagram showing a comparative example of the present invention, and FIG. 2 is an embodiment of the present invention, showing only the parts different from the comparative example of FIG. 1. 1...Fuel tank, 2...Fuel vapor exhaust path, 3...Canister, 9, 11...
...Opening/closing valve, 13゜13'...Fuel filler port (cap), 14...Air chamber.
Claims (1)
蒸気をキャニスタ3を介して排出するようにした内燃機
関の燃料系統において、燃料タンク1の給油口の開閉を
検出する手段を設け、燃料タンク1とキャニスタ3とを
結ぶ燃料蒸気排出経路2′の途中に、燃料タンクの給油
口を閉めているそき開き、該給油口を開いているとき閉
じる開閉弁11を設け、前記給油口開閉検出手段はピボ
ットアームから戒り、該ピボットアームの一端は燃料タ
ンク1内で給油口キャップ13′に当接可能であり他端
は燃料タンク1の外部にあって、該他端の動きにより前
記燃料蒸気排出経路2′を機械的に開閉させるようにし
たことを特徴とする燃料タンク内圧制御装置。In the fuel system of an internal combustion engine in which an air chamber 14 is formed in the upper part of the fuel tank 1 and fuel vapor in the tank is discharged through the canister 3, means for detecting opening and closing of the fuel filler port of the fuel tank 1 is provided, In the middle of the fuel vapor discharge path 2' connecting the fuel tank 1 and the canister 3, there is provided an on-off valve 11 which opens when the fuel filler port of the fuel tank is closed and which closes when the filler port is open. The opening/closing detection means is connected to a pivot arm, one end of which can come into contact with the fuel filler cap 13' inside the fuel tank 1, and the other end of which is located outside the fuel tank 1, so that it can be detected by movement of the other end. A fuel tank internal pressure control device characterized in that the fuel vapor discharge path 2' is mechanically opened and closed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP453579U JPS6014916Y2 (en) | 1979-01-20 | 1979-01-20 | Fuel tank internal pressure control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP453579U JPS6014916Y2 (en) | 1979-01-20 | 1979-01-20 | Fuel tank internal pressure control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55106356U JPS55106356U (en) | 1980-07-25 |
JPS6014916Y2 true JPS6014916Y2 (en) | 1985-05-11 |
Family
ID=28809565
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP453579U Expired JPS6014916Y2 (en) | 1979-01-20 | 1979-01-20 | Fuel tank internal pressure control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6014916Y2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0433133Y2 (en) * | 1985-01-29 | 1992-08-10 | ||
JPH0537006Y2 (en) * | 1986-08-07 | 1993-09-20 | ||
JPS63138150A (en) * | 1986-11-29 | 1988-06-10 | Isuzu Motors Ltd | Control device for vaporizing fuel |
-
1979
- 1979-01-20 JP JP453579U patent/JPS6014916Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS55106356U (en) | 1980-07-25 |
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