JPH0511334Y2 - - Google Patents
Info
- Publication number
- JPH0511334Y2 JPH0511334Y2 JP1986145627U JP14562786U JPH0511334Y2 JP H0511334 Y2 JPH0511334 Y2 JP H0511334Y2 JP 1986145627 U JP1986145627 U JP 1986145627U JP 14562786 U JP14562786 U JP 14562786U JP H0511334 Y2 JPH0511334 Y2 JP H0511334Y2
- Authority
- JP
- Japan
- Prior art keywords
- canister
- fuel
- intake
- supercharging pressure
- supply passage
- 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 - Lifetime
Links
Landscapes
- Supercharger (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
この考案は、キヤニスタ内の吸着燃料を強制脱
気することができる過給機付エンジンの蒸発燃料
吸着装置に関するものである。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an evaporative fuel adsorption device for a supercharged engine that is capable of forcibly deaerating adsorbed fuel in a canister.
（従来技術）
一般に、蒸発燃料を吸着するキヤニスタにおい
ては、蒸発燃料以外の高分子ガスが付着すると、
吸着能力が低下するという問題がある。そこで、
キヤニスタ内の吸着燃料を強制脱気する方法とし
て従来は、本来エンジンの排気系に供給すべき二
次エアをエアポンプによりキヤニスタに圧送して
強制脱気を行つていた。（例えば実開昭52−59826
号公報）
しかしながら、エンジンへの燃料の供給はエア
フローメーターにより検出された吸入空気量に見
合つた量の燃料が供給されることにより行われて
正しい空燃比が得られるが、上記従来装置の場合
エアフローメーターをバイパスして二次エアがキ
ヤニスタを経て吸気系に入ることになるため空燃
比にくるいを生じるという不具合があつた。(Prior art) Generally, in a canister that adsorbs evaporated fuel, when polymer gas other than evaporated fuel adheres,
There is a problem in that the adsorption capacity decreases. Therefore,
Conventionally, as a method for forcibly deaerating the adsorbed fuel in the canister, secondary air, which should normally be supplied to the exhaust system of the engine, was force-fed to the canister using an air pump to perform forced deaeration. (For example, Utsukai Showa 52-59826
However, the correct air-fuel ratio can be obtained by supplying fuel to the engine in an amount commensurate with the amount of intake air detected by the air flow meter, but in the case of the conventional device described above, the air flow There was a problem with the air-fuel ratio being distorted because the secondary air bypassed the meter and entered the intake system via the canister.
（考案の目的）
この考案は、上記従来装置の不具合を解消する
ためになされたもので、キヤニスタに供給するエ
アをエアフローメーターで検出して空燃比のくる
いを生じることなくキヤニスタの吸着能力を向上
できる過給機付エンジンの蒸発燃料吸着装置を提
供するものである。(Purpose of the invention) This invention was made in order to solve the above-mentioned problems with the conventional device, and uses an air flow meter to detect the air supplied to the canister to increase the adsorption capacity of the canister without causing fluctuations in the air-fuel ratio. The present invention provides an improved vaporized fuel adsorption device for a supercharged engine.
（考案の構成） 図面を参考にして説明する。(Structure of the idea) This will be explained with reference to the drawings.
燃料タンク４からの蒸発燃料を取入れる蒸発燃
料取入口５および蒸発燃料を放出する蒸発燃料放
出口６を設けた容器に活性炭３を充填してなるキ
ヤニスタ１と、エンジン１８に供給される吸気を
過給する過給機１０とを備えたエンジンにおい
て、上記キヤニスタ１に過給圧を供給する過給圧
供給通路１６を上記キヤニスタ１と過給機１０下
流の吸気通路９との間に設け、この過給圧供給通
路１６に、吸気通路９側の圧力が上記キヤニスタ
１側よりも低い時に過給圧供給通路１６を閉じる
弁１７を設けたものである。 A canister 1 is constructed by filling activated carbon 3 into a container provided with an evaporative fuel intake port 5 for receiving evaporative fuel from a fuel tank 4 and an evaporative fuel outlet 6 for discharging the evaporative fuel, and a canister 1 for supplying intake air to an engine 18. In an engine equipped with a supercharger 10 for supercharging, a supercharging pressure supply passage 16 for supplying supercharging pressure to the canister 1 is provided between the canister 1 and the intake passage 9 downstream of the supercharger 10, This supercharging pressure supply passage 16 is provided with a valve 17 that closes the supercharging pressure supply passage 16 when the pressure on the intake passage 9 side is lower than that on the canister 1 side.
（実施例） 図面に基づいてこの考案の実施例を説明する。(Example) An embodiment of this invention will be described based on the drawings.
１はキヤニスタで、容器２には活性炭３を充填
し、燃料タンク４からの蒸発燃料を取入れる蒸発
燃料取入口５および蒸発燃料を放出する蒸発燃料
放出口６を設けている。 Reference numeral 1 designates a canister, and a container 2 is filled with activated carbon 3 and is provided with an evaporative fuel intake port 5 for taking in evaporative fuel from a fuel tank 4 and an evaporative fuel outlet 6 for discharging the evaporative fuel.
７はエアクリーナ、８はエアフローメーター、
９は吸気通路、１０は過給機で、吸気通路９側に
コンプレツサ１１と排気通路１２側にタービン１
３とを設け、またコンプレツサ１１の下流の過給
圧が一定圧以上になるとアクチエータ１４によつ
て開放されるウエストゲートバルブ１５を設けて
いる。 7 is the air cleaner, 8 is the air flow meter,
9 is an intake passage, 10 is a supercharger, with a compressor 11 on the intake passage 9 side and a turbine 1 on the exhaust passage 12 side.
3, and a waste gate valve 15 that is opened by an actuator 14 when the boost pressure downstream of the compressor 11 exceeds a certain pressure.
そして、過給機１０下流の吸気通路９とキヤニ
スタ１との間に過給圧供給通路１６が設けられ、
該通路の中途にチエツク弁１７が設けられてい
る。 A supercharging pressure supply passage 16 is provided between the intake passage 9 downstream of the supercharger 10 and the canister 1,
A check valve 17 is provided in the middle of the passage.
また、エンジン１８の吸気通路９側にはインタ
ークーラ１９、スロツトルバルブ２０、サージタ
ンク２１、吸気マニホールド２２を順次接続して
いる。排気通路１２には触媒２３を設けている。 Further, an intercooler 19, a throttle valve 20, a surge tank 21, and an intake manifold 22 are connected in this order to the intake passage 9 side of the engine 18. A catalyst 23 is provided in the exhaust passage 12.
前記蒸発燃料放出口６は容器２の上部に設けら
れたパージバルブ２４内にありパイプ２５を経て
サージタンク２１に連通している。パージバルブ
２４の作動側は圧縮ばね２６と弁付ダイヤフラム
２７とからなり、作動室はパイプ２８を経てスロ
ツトルバルブ２０の上流側に連通している。容器
２とパージバルブ２４との間には連通孔２９を設
けている。さらに容器２はパイプ３０を経て排気
通路１２に連通し、中途に排気ガスの逆流を防止
するためのチエツク弁３１を設けている。３２は
容器２の上流側に設けた逆止弁である。 The vaporized fuel discharge port 6 is located in a purge valve 24 provided at the upper part of the container 2 and communicates with the surge tank 21 via a pipe 25. The operating side of the purge valve 24 consists of a compression spring 26 and a valved diaphragm 27, and the operating chamber communicates with the upstream side of the throttle valve 20 via a pipe 28. A communication hole 29 is provided between the container 2 and the purge valve 24. Further, the container 2 communicates with the exhaust passage 12 through a pipe 30, and is provided with a check valve 31 midway through to prevent backflow of exhaust gas. 32 is a check valve provided on the upstream side of the container 2.
次にキヤニスタ１の強制脱気の状況を説明す
る。 Next, the situation of forced degassing of the canister 1 will be explained.
エアクリーナ７より流入した空気はエアフロー
メーター８によつて計量され過給機１０のコンプ
レツサー１１によつて加圧されたのち過給圧供給
通路１６より容器２内に入り活性炭３の脱気が行
われる。即ち活性炭３の細孔に付着した高分子ガ
スが除去される。この場合の過給空気は高圧であ
るとともにインタークーラ１９の上流側であるた
め高温であり脱気性の向上が期待できる。また過
給圧供給通路１６に設けられたチエツク弁１７は
容器２内のオーバーフローした液状燃料が吸気通
路９に入るのを阻止して空燃比のくるいを生じな
いようにしている。 The air flowing in from the air cleaner 7 is measured by the air flow meter 8 and pressurized by the compressor 11 of the supercharger 10, and then enters the container 2 through the boost pressure supply passage 16 and degasses the activated carbon 3. . That is, the polymer gas adhering to the pores of the activated carbon 3 is removed. In this case, the supercharged air has a high pressure and is at a high temperature since it is located upstream of the intercooler 19, and an improvement in deaeration performance can be expected. A check valve 17 provided in the boost pressure supply passage 16 prevents overflowing liquid fuel in the container 2 from entering the intake passage 9, thereby preventing the air-fuel ratio from changing.
容器２内の蒸発燃料は前記連通孔２９を通りパ
ージバルブ２４内に入る。この時、スロツトルバ
ルブ２０が開いて吸気負圧がかかると弁付ダイヤ
フラム２７が開くため上記蒸発燃料は蒸発燃料放
出口６よりパイプ２５を通りサージタンク２１即
ち吸気通路内に入る。スロツトルバルブ２０が開
いて吸気負圧がパージバルブ２４に作用するのは
エンジンの低中負荷の場合に限られ、エンジンの
高負荷領域ではスロツトルバルブ２０が全開とな
つて負圧が生じないためパージバルブ２４の弁付
ダイヤフラム２７は蒸発燃料放出口６を閉じて蒸
発燃料の蒸発燃料放出口６からのパージは不可能
となる。このような場合に、蒸発燃料はパイプ３
０を経て排気通路１２に流れて燃焼することにな
る。 The evaporated fuel in the container 2 passes through the communication hole 29 and enters the purge valve 24 . At this time, when the throttle valve 20 opens and negative intake pressure is applied, the valved diaphragm 27 opens, so that the vaporized fuel passes through the pipe 25 from the vaporized fuel discharge port 6 and enters the surge tank 21, that is, the intake passage. The throttle valve 20 opens and intake negative pressure acts on the purge valve 24 only when the engine is under low to medium load. In high engine load areas, the throttle valve 20 opens fully and no negative pressure is generated. The valved diaphragm 27 of the purge valve 24 closes the evaporated fuel outlet 6, making it impossible to purge the evaporated fuel from the evaporated fuel outlet 6. In such a case, the evaporated fuel is transferred to pipe 3.
0 and flows into the exhaust passage 12 where it is combusted.
容器２の上流側に設けられた前記過給圧供給通
路１６の内径は容器２の下流側に設けられたパイ
プ３０の内径よりも大きくなつており、つまり容
器２の流入側の抵抗を流出側の抵抗よりも大きく
することにより容器２内の圧力を高くして過給気
による活性炭３の脱気を効果的に行わせるように
なつている。 The inner diameter of the supercharging pressure supply passage 16 provided on the upstream side of the container 2 is larger than the inner diameter of the pipe 30 provided on the downstream side of the container 2. In other words, the resistance on the inflow side of the container 2 is made larger than the resistance on the outflow side. By making the resistance larger than that of , the pressure inside the container 2 is increased and the activated carbon 3 is effectively degassed by the supercharged air.
（考案の効果）
この考案はキヤニスタに過給圧を供給する過給
圧供給通路を上記キヤニスタと過給機下流の吸気
通路との間に設けたものであり、高圧でかつ高温
の過給空気がキヤニスタに供給されるため脱気が
効果的に行われ従つてキヤニスタを大型化せずに
済み、またエアフローメーターで計量された該過
給空気はキヤニスタ内の蒸発燃料とともに吸気通
路に還流されるため、従来装置と異なり空燃比に
くるいを生じることがない。さらに過給圧供給通
路に、吸気側の圧力がキヤニスタ側よりも低い時
に、この過給圧供給通路を閉じる弁を設けたこと
により、キヤニスタの容器からオーバーフローし
た液体燃料、蒸発燃料が過給圧供給通路を通つて
吸気通路側に逆流するのを阻止するため、過給圧
供給通路からの燃料漏れによる空燃比のくるいを
防止できるものである。(Effects of the invention) This invention provides a supercharging pressure supply passage that supplies supercharging pressure to the canister between the canister and the intake passage downstream of the supercharger, which allows high-pressure and high-temperature supercharged air to be supplied to the canister. Since the supercharged air is supplied to the canister, degassing is performed effectively and the canister does not have to be made large, and the supercharged air measured by the air flow meter is returned to the intake passage together with the evaporated fuel in the canister. Therefore, unlike conventional devices, there is no fluctuation in the air-fuel ratio. Furthermore, by providing a valve in the boost pressure supply passage that closes the boost pressure supply passage when the pressure on the intake side is lower than that on the canister side, the liquid fuel and evaporated fuel overflowing from the canister container are transferred to the boost pressure. Since the fuel is prevented from flowing backward through the supply passage toward the intake passage, it is possible to prevent the air-fuel ratio from changing due to fuel leakage from the boost pressure supply passage.
第１図はこの考案に係る過給機付エンジンの蒸
発燃料の吸気装置の説明図である。
１……キヤニスタ、３……活性炭、４……燃料
タンク、５……蒸発燃料取入口、６……蒸発燃料
放出口、９……吸気通路、１０……過給機、１６
……過給圧供給通路、１８……エンジン。
FIG. 1 is an explanatory diagram of an evaporated fuel intake system for a supercharged engine according to the present invention. 1...Canister, 3...Activated carbon, 4...Fuel tank, 5...Evaporative fuel intake, 6...Evaporative fuel discharge port, 9...Intake passage, 10...Supercharger, 16
...Supercharging pressure supply passage, 18...Engine.
Claims (1)
燃料を放出する蒸発燃料放出口を設けた容器に活
性炭を充填してなるキヤニスタと、エンジンに供
給される吸気を過給する過給機とを備えたエンジ
ンにおいて、上記キヤニスタと過給機下流の吸気
通路とを連通して上記キヤニスタに過給圧を供給
する過給圧供給通路を設け、該過給圧供給通路
に、吸気側の圧力が上記キヤニスタ側よりも低い
時に上記過給圧供給通路を閉じる弁を設けたこと
を特徴とする過給機付エンジンの蒸発燃料吸着装
置。 Equipped with a canister formed by filling activated carbon into a container provided with an evaporated fuel intake port for taking in evaporated fuel and an evaporative fuel discharge port for discharging evaporated fuel, and a supercharger for supercharging intake air supplied to the engine. In the engine, a supercharging pressure supply passage is provided that communicates the canister with an intake passage downstream of the supercharger and supplies supercharging pressure to the canister, and the supercharging pressure supply passage is configured such that pressure on the intake side is connected to the canister. An evaporative fuel adsorption device for a supercharged engine, characterized in that a valve is provided that closes the supercharging pressure supply passage when the supercharging pressure is lower than the supercharging pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986145627U JPH0511334Y2 (en) | 1986-09-22 | 1986-09-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986145627U JPH0511334Y2 (en) | 1986-09-22 | 1986-09-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6351148U JPS6351148U (en) | 1988-04-06 |
| JPH0511334Y2 true JPH0511334Y2 (en) | 1993-03-19 |
Family
ID=31057344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986145627U Expired - Lifetime JPH0511334Y2 (en) | 1986-09-22 | 1986-09-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0511334Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009052172A (en) * | 2007-08-28 | 2009-03-12 | Noguchi Knit:Kk | Knit cap with liner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58146854U (en) * | 1982-03-29 | 1983-10-03 | トヨタ自動車株式会社 | Fuel vapor emission control device for supercharged engines |
-
1986
- 1986-09-22 JP JP1986145627U patent/JPH0511334Y2/ja not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009052172A (en) * | 2007-08-28 | 2009-03-12 | Noguchi Knit:Kk | Knit cap with liner |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6351148U (en) | 1988-04-06 |
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