JPH0537007Y2 - - Google Patents
Info
- Publication number
- JPH0537007Y2 JPH0537007Y2 JP10559687U JP10559687U JPH0537007Y2 JP H0537007 Y2 JPH0537007 Y2 JP H0537007Y2 JP 10559687 U JP10559687 U JP 10559687U JP 10559687 U JP10559687 U JP 10559687U JP H0537007 Y2 JPH0537007 Y2 JP H0537007Y2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- purge passage
- solenoid valve
- diaphragm
- canister
- 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
- 238000010926 purge Methods 0.000 claims description 25
- 239000000446 fuel Substances 0.000 claims description 11
- 239000002828 fuel tank Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、内燃機関の蒸発燃料処理装置に関す
る。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an evaporated fuel processing device for an internal combustion engine.
（従来の技術）
自動車の排出ガス対策の一環として、燃料タン
クに活性炭を内蔵するキヤニスタが接続され、燃
料タンク内に発生する蒸発ガス（HC）をこの活
性炭に吸着させて大気に放出されることを防止す
るようになつている（例えば、特開昭57−52663，
57−86555号公報、実開昭61−69459号公報、参
照）。(Conventional technology) As part of automobile exhaust gas countermeasures, a canister containing activated carbon is connected to the fuel tank, and the activated carbon adsorbs the evaporative gas (HC) generated in the fuel tank and is released into the atmosphere. (For example, Japanese Patent Application Laid-Open No. 57-52663,
57-86555, Utility Model Application Publication No. 61-69459, see).
このような装置として、従来例えば第３図に示
すように、活性炭を内蔵するキヤニスタ７はチヤ
ージ通路１０を介して燃料タンク３内の蒸発ガス
が導入されるとともに、パージ通路８を介して絞
弁５より下流側の吸気管２にパージエアが導入さ
れる。 Conventionally, as shown in FIG. 3, for example, as shown in FIG. Purge air is introduced into the intake pipe 2 on the downstream side of the intake pipe 5.
パージ通路８の途中には電磁弁４が介装され、
この電磁弁４はコントロールユニツト９から送ら
れる励磁電流により弁体１３を開弁駆動する。 A solenoid valve 4 is interposed in the middle of the purge passage 8,
This electromagnetic valve 4 drives a valve body 13 to open by an excitation current sent from a control unit 9.
コントロールユニツト９は機関温度、吸入空気
量計１４、排気管１１に設けられた空燃比センサ
１３、および回転数計等の検出信号に基づいて燃
料噴射弁１２をフイードバツク制御するととも
に、電磁弁４を開弁駆動して、パージエアの流入
量を調節することにより、機関空燃比が大きく乱
れることを防止している。 The control unit 9 performs feedback control of the fuel injection valve 12 based on detection signals from the engine temperature, the intake air flow meter 14, the air-fuel ratio sensor 13 provided in the exhaust pipe 11, the rotation speed meter, etc., and also controls the solenoid valve 4. By opening the valve and adjusting the inflow amount of purge air, the engine air-fuel ratio is prevented from being greatly disturbed.
また、機関停止時は電磁弁４によりパージ通路
８を遮断してキヤニスター７のパージを停止して
いる。 Furthermore, when the engine is stopped, the purge passage 8 is shut off by the solenoid valve 4 to stop purging of the canister 7.
（考案が解決しようとする問題点）
しかしながら、電磁弁４内にはパージ通路８を
通つてキヤニスタ７から離脱した蒸発ガスや、大
気中の無機物および有機物が混合して流入し、こ
れらが電磁弁４のシート部２３に付着すると、こ
の付着した成分が時間経過に伴つてガム化し、弁
体１３とシート部１４を１Kg近い固着力で粘着し
て、電磁弁４の作動不良を起こし、パージ不能に
なることがあつた。(Problem to be solved by the invention) However, the evaporated gas that has left the canister 7 through the purge passage 8 and a mixture of inorganic and organic matter in the atmosphere flow into the solenoid valve 4, and these are mixed into the solenoid valve 4. If it adheres to the seat part 23 of the solenoid valve 4, this adhered component will turn into gum over time and stick to the valve body 13 and the seat part 14 with an adhesion force of nearly 1 kg, causing malfunction of the solenoid valve 4 and making purging impossible. It happened that it happened.
また、電磁弁４を開弁する駆動力は、コイルを
流れる電流値と、コイルの巻き数によつて決まる
が、自動車に搭載されるバツテリー電圧が限定さ
れるとともに、コイルの巻き数も小型軽量化の要
請から制約されるため、通常数百ｇに設定される
のである。 In addition, the driving force for opening the solenoid valve 4 is determined by the current value flowing through the coil and the number of turns of the coil, but the battery voltage installed in the car is limited, and the number of turns of the coil is also small and lightweight. It is usually set at several hundred grams because of the restrictions imposed by the demands of the industry.
本考案は、こうした従来の問題点を解決するこ
とを目的とする。 The present invention aims to solve these conventional problems.
（問題点を解決するための手段）
上記目的を達成するため本考案では、燃料タン
クに貯溜された燃料から発生する蒸発ガスを回収
するキヤニスターと、このキヤニスターを吸気管
に連通するパージ通路と、このパージ通路を遮断
するダイヤフラム弁を設け、このダイヤフラム弁
の開弁駆動圧として絞弁の開弁時にその弁端部の
近傍に生じる吸気管負圧を導入する一方、パージ
通路の途中に前記ダイヤフラム弁と直列に全閉位
置でも弁体とシート部の間に隙間を有する構造の
電磁弁を介装し、この電磁弁を運転条件に応じて
開弁駆動する制御手段を設けた。(Means for Solving the Problems) In order to achieve the above object, the present invention includes a canister that collects evaporative gas generated from fuel stored in a fuel tank, a purge passage that communicates this canister with an intake pipe, A diaphragm valve is provided to shut off this purge passage, and the intake pipe negative pressure generated near the valve end when the throttle valve is opened is introduced as the driving pressure for opening the diaphragm valve. A solenoid valve having a structure in which there is a gap between the valve body and the seat even in the fully closed position is installed in series with the valve, and a control means is provided to drive the solenoid valve to open according to operating conditions.
（作用）
上記構成に基づき、機関停止時およびアイドル
時はダイヤフラム弁によりパージ通路を遮断する
一方、吸入空気量がある程度上昇した運転条件で
は、ダイヤフラム弁が全開するとともに、電磁弁
によりパージ通路の流路面積を調節することによ
り、機関空燃比を乱さないようにしてパージエア
を導入する。(Function) Based on the above configuration, the diaphragm valve shuts off the purge passage when the engine is stopped or idling, while under operating conditions where the amount of intake air has increased to a certain extent, the diaphragm valve opens fully and the solenoid valve opens the purge passage. By adjusting the road area, purge air is introduced without disturbing the engine air-fuel ratio.
ダイヤフラム弁によりパージ通路を遮断するこ
とにより、電磁弁は弁体をシート部に着座させる
必要がなくなり、したがつて電磁弁内に付着した
粘着性物質により弁体がシート部に固着されるこ
とを回避できる。また、ダイヤフラム弁は絞弁の
近傍に生じる負圧により十分な開弁駆動力が得ら
れ、上記蒸発ガスがガム化した物質の粘着力に対
抗して安定した作動性が確保される。 By blocking the purge passage with a diaphragm valve, the solenoid valve does not need to seat the valve body on the seat, thus preventing the valve body from becoming stuck to the seat due to sticky substances stuck inside the solenoid valve. It can be avoided. Further, the diaphragm valve can obtain a sufficient opening driving force due to the negative pressure generated in the vicinity of the throttle valve, and stable operability is ensured against the adhesive force of the substance in which the evaporated gas is turned into gum.
（実施例）
以下、本考案の一実施例を添付図面に基づいて
説明する。なお、従来例と同一構成部には同一符
号を付す。(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings. Note that the same reference numerals are given to the same components as in the conventional example.
第１図に示すように、パージ通路８の途中に電
磁弁２１と直列にダイヤフラム弁１５を介装す
る。 As shown in FIG. 1, a diaphragm valve 15 is interposed in the middle of the purge passage 8 in series with the solenoid valve 21.
ダイヤフラム弁１５はそのダイヤフラム１９を
スプリングの付勢力により弁座２０に着座させて
パージ通路８の流路を遮断するようになつてお
り、そのダイヤフラム室１６は負圧通路１７を介
して吸気管２に形成された負圧取出口１８に連通
する。 The diaphragm valve 15 has its diaphragm 19 seated on a valve seat 20 by the biasing force of a spring to block the flow path of the purge passage 8, and the diaphragm chamber 16 is connected to the intake pipe 2 through a negative pressure passage 17. It communicates with a negative pressure outlet 18 formed in.
負圧取出口１８は、絞弁５が全閉位置（アイド
ル位置）にあるときのその弁端部５Ａよりわずか
に上流に位置して、ダイヤフラム室１６大気圧を
導入してダイヤフラム弁１５を閉弁させる一方、
絞弁５が所定開度より大きく開く運転条件で弁端
部５Ａより下流側に位置し、弁端部５Ａの下流に
発生する負圧をダイヤフラム室１６に導入してダ
イヤフラム弁１５を開弁させる。 The negative pressure outlet 18 is located slightly upstream of the valve end 5A when the throttle valve 5 is in the fully closed position (idle position), and introduces atmospheric pressure into the diaphragm chamber 16 to close the diaphragm valve 15. On the other hand,
Under operating conditions in which the throttle valve 5 opens more than a predetermined opening degree, the throttle valve 5 is located downstream of the valve end 5A, and the negative pressure generated downstream of the valve end 5A is introduced into the diaphragm chamber 16 to open the diaphragm valve 15. .
第２図にも示すように、電磁弁２１は非通電時
にその弁体２２をシート部２３に微少な隙間a0を
もつて保持して、パージ通路８の流路面積を絞る
一方、通電時で弁体２３がシート部２３に対し大
きな間隔ｂをもつて保持され、パージ通路８を全
開する。 As shown in FIG. 2, when the solenoid valve 21 is not energized, the valve body 22 is held in the seat portion 23 with a small gap a0 to narrow the flow area of the purge passage 8, while when energized At this point, the valve body 23 is held with a large distance b from the seat portion 23, and the purge passage 8 is fully opened.
コントロールユニツト９は機関温度、吸入空気
量計１４、排気管１１に設けられた空燃比センサ
１３、および回転数計等の検出信号に基づいて燃
料噴射弁１２をフイードバツク制御するととも
に、電磁弁２１を開弁駆動して、パージエアの流
入量を調節することにより、機関空燃比が大きく
乱れることを防止している。 The control unit 9 performs feedback control of the fuel injection valve 12 based on detection signals from the engine temperature, the intake air flow meter 14, the air-fuel ratio sensor 13 provided in the exhaust pipe 11, the rotation speed meter, etc., and also controls the solenoid valve 21. By opening the valve and adjusting the inflow amount of purge air, the engine air-fuel ratio is prevented from being greatly disturbed.
このように構成してあり、電磁弁２１は全閉位
置でも、弁体２２がシート部２３に接触すること
がなく、キヤニスタ７からの蒸発ガス等がガム化
した物質により弁体２２がシート部２３に粘着す
ることを回避でき、電磁弁２１の小型化が可能と
なる。 With this structure, even when the electromagnetic valve 21 is in the fully closed position, the valve body 22 does not come into contact with the seat portion 23, and the valve body 22 does not come into contact with the seat portion 23 due to the gum-formed substance such as evaporated gas from the canister 7. 23 can be avoided, and the solenoid valve 21 can be made smaller.
また、負圧取出口１８には絞弁５が所定開度を
越えて開くときに−100mmHg近い負圧がかかり、
ダイヤフラム１９の受圧面積を10cm2程度に設定す
ることにより、約1.4Kgの開弁駆動力が得られる
ため、キヤニスタ７からの蒸発ガス等がガム化し
た物質による固着力に十分に対抗して安定した開
弁作動性が確保される。 Further, when the throttle valve 5 opens beyond a predetermined opening degree, a negative pressure of nearly -100 mmHg is applied to the negative pressure outlet 18.
By setting the pressure-receiving area of the diaphragm 19 to about 10 cm 2 , a valve-opening driving force of about 1.4 kg can be obtained, so that the evaporated gas from the canister 7 sufficiently counters the sticking force of the gummed material and stabilizes. Valve opening operability is ensured.
（考案の効果）
以上の通り本考案によれば、パージ通路の途中
にその流路を絞り、全閉位置でも弁体とシート部
の間に隙間を有する構造の電磁弁と、吸気管に生
じる負圧に応じて流路を遮断するダイヤフラム弁
を直列に介装したため、ダイヤフラム弁は吸気管
に生じる負圧により十分な開弁駆動力が得られ、
粘着力に対抗して安定した作動性が確保される一
方、電磁弁はパージ通路を遮断する必要がなく、
その弁体がシート部に粘着することを回避し、小
型化がはかれる。(Effects of the invention) As described above, according to the invention, the purge passage is narrowed in the middle of the purge passage, and the electromagnetic valve has a structure in which there is a gap between the valve body and the seat even in the fully closed position. Because a diaphragm valve that shuts off the flow path in response to negative pressure is installed in series, the diaphragm valve can obtain sufficient opening driving force from the negative pressure generated in the intake pipe.
While ensuring stable operability against adhesive forces, the solenoid valve does not require blocking the purge passage.
This prevents the valve body from adhering to the seat portion, allowing for miniaturization.
第１図は本考案の一実施例を示す全体図、第２
図は同じく電磁弁の要部拡大断面図である。第３
図は従来例を示す全体図である。
１……機関、２……吸気管、５……絞弁、７…
…キヤニスタ、８……パージ通路、１５……ダイ
ヤフラム弁、１７……負圧通路、１８……負圧取
出口、２１……電磁弁、２２……弁体、２３……
シート部。
Figure 1 is an overall view showing one embodiment of the present invention;
The figure is also an enlarged sectional view of the main part of the solenoid valve. Third
The figure is an overall view showing a conventional example. 1...engine, 2...intake pipe, 5...throttle valve, 7...
... Canister, 8 ... Purge passage, 15 ... Diaphragm valve, 17 ... Negative pressure passage, 18 ... Negative pressure outlet, 21 ... Solenoid valve, 22 ... Valve body, 23 ...
Seat part.
Claims (1)
ガスを回収するキヤニスターと、このキヤニスタ
ーを吸気管に連通するパージ通路と、このパージ
通路を遮断するダイヤフラム弁を設け、このダイ
ヤフラム弁の開弁駆動圧として絞弁の開弁時にそ
の弁端部の近傍に生じる吸気管負圧を導入する一
方、パージ通路の途中に前記ダイヤフラム弁と直
列に、全閉位置でも弁体とシート部の間に隙間を
有する構造の電磁弁を介装し、この電磁弁を運転
条件に応じて開弁駆動する制御手段を設けたこと
を特徴とする内燃機関の蒸発燃料処理装置。 A canister that collects evaporative gas generated from the fuel stored in the fuel tank, a purge passage that communicates the canister with the intake pipe, and a diaphragm valve that shuts off this purge passage are provided. While introducing the intake pipe negative pressure generated near the valve end when the throttle valve is opened, there is a gap between the valve body and the seat part in the middle of the purge passage in series with the diaphragm valve even in the fully closed position. 1. An evaporative fuel processing device for an internal combustion engine, characterized in that a solenoid valve of the same structure is interposed therein, and a control means is provided for opening the solenoid valve according to operating conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10559687U JPH0537007Y2 (en) | 1987-07-09 | 1987-07-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10559687U JPH0537007Y2 (en) | 1987-07-09 | 1987-07-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6411349U JPS6411349U (en) | 1989-01-20 |
| JPH0537007Y2 true JPH0537007Y2 (en) | 1993-09-20 |
Family
ID=31338351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10559687U Expired - Lifetime JPH0537007Y2 (en) | 1987-07-09 | 1987-07-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0537007Y2 (en) |
-
1987
- 1987-07-09 JP JP10559687U patent/JPH0537007Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6411349U (en) | 1989-01-20 |
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