JP3240091B2 - Evaporative fuel processing equipment - Google Patents
Evaporative fuel processing equipmentInfo
- Publication number
- JP3240091B2 JP3240091B2 JP16185794A JP16185794A JP3240091B2 JP 3240091 B2 JP3240091 B2 JP 3240091B2 JP 16185794 A JP16185794 A JP 16185794A JP 16185794 A JP16185794 A JP 16185794A JP 3240091 B2 JP3240091 B2 JP 3240091B2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- adsorbent
- chamber
- switching
- casing
- 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 - Fee Related
Links
Landscapes
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、両端が閉塞された筒状
のケーシング内には、蒸発燃料を吸着する吸着剤がそれ
ぞれ充填されて成る第1および第2吸着剤充填層が、ケ
ーシングの一端壁に固設された仕切り壁を相互間に挟ん
で設けられ、第1吸着剤充填層の一端面とケーシングの
一端壁との間に形成される第1室には、給油時の燃料タ
ンクからの蒸発燃料を導く蒸発燃料通路と、パージガス
をエンジンの吸気系に導出するパージガス通路とが接続
され、第2吸着剤充填層とケーシングの一端壁との間に
形成される第2室は大気に開放され、第1および第2吸
着剤充填層とケーシングの他端壁との間には両吸着剤充
填層に共通な第3室が形成される蒸発燃料処理装置に関
する。BACKGROUND OF THE INVENTION The present invention relates to a first and second adsorbent-filled layers, each of which is filled with an adsorbent for adsorbing evaporated fuel, in a cylindrical casing having both ends closed. A first chamber formed between one end surface of the first adsorbent-filled layer and one end wall of the casing is provided, with a partition wall fixed to the one end wall interposed therebetween. An evaporative fuel passage for introducing evaporative fuel from the fuel cell and a purge gas passage for introducing purge gas to an intake system of the engine are connected to each other, and a second chamber formed between the second adsorbent packed layer and one end wall of the casing is connected to the atmosphere. And a third chamber common to both the adsorbent-filled layers is formed between the first and second adsorbent-filled layers and the other end wall of the casing.
【0002】[0002]
【従来の技術】従来、かかる装置は、たとえば特開平1
−159455号公報等により既に知られている。2. Description of the Related Art Conventionally, such an apparatus is disclosed in, for example,
It is already known, for example, from Japanese Patent Application No. 159455.
【0003】[0003]
【発明が解決しようとする課題】上記従来のものでは、
燃料タンクからの蒸発燃料を第1室から第1吸着剤充填
層および第3室を経て第2吸着剤充填層へと直列に流す
ことにより、ケーシングの軸長をL、直径をDとしたと
きにLを大きくすることなくL/Dを大きくするように
している。SUMMARY OF THE INVENTION In the above prior art,
When the axial length of the casing is L and the diameter is D by flowing the fuel vapor from the fuel tank in series from the first chamber to the second adsorbent packed layer through the first adsorbent packed bed and the third chamber. Therefore, L / D is increased without increasing L.
【0004】しかるに燃料タンクからの蒸発燃料の発生
は、車両の駐、停車時には緩やかであり、蒸発燃料の流
速も比較的小さいので第1および第2吸着剤充填層に蒸
発燃料を充分に送り込むことができるが、給油時には燃
料タンクで比較的大量の蒸発燃料が生じることにより蒸
発燃料の流速も比較的大きく、それにより第3室を相互
間に介在させて直列状態に在る両吸気剤充填層の通気抵
抗が比較的大きくなり、両吸気剤充填層への蒸発燃料の
送り込みが不充分となるだけでなく、燃料タンク内への
給油も不充分となる虞があるため、L/Dを小さくしな
ければならないと言う問題があった。However, the generation of fuel vapor from the fuel tank is slow when the vehicle is parked or stopped, and the flow rate of the fuel vapor is relatively small. Therefore, it is necessary to sufficiently supply the fuel vapor to the first and second adsorbent packed beds. However, at the time of refueling, a relatively large amount of evaporative fuel is generated in the fuel tank, so that the flow rate of the evaporative fuel is also relatively large. Has a relatively large ventilation resistance, which may result in insufficient supply of evaporated fuel to both intake agent-filled layers and insufficient supply of fuel into the fuel tank. There was a problem that we had to do.
【0005】本発明は、かかる事情に鑑みてなされたも
のであり、給油時に燃料タンクで発生する蒸発燃料の吸
着剤充填層での通気抵抗を比較的低く抑えて吸着材充填
層にの蒸発燃料を充分な送り込めるようにして燃料タン
クへの充分な給油を可能とした蒸発燃料処理装置を提供
することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it has been proposed to reduce the flow resistance of evaporative fuel generated in a fuel tank at the time of refueling in an adsorbent-filled layer to a relatively low level. It is an object of the present invention to provide an evaporative fuel treatment apparatus capable of supplying sufficient fuel to a fuel tank and enabling sufficient fuel supply to a fuel tank.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
に、請求項1記載の発明は、両端が閉塞された筒状のケ
ーシング内には、蒸発燃料を吸着する吸着剤がそれぞれ
充填されて成る第1および第2吸着剤充填層が、ケーシ
ングの一端壁に固設された仕切り壁を相互間に挟んで設
けられ、第1吸着剤充填層の一端面とケーシングの一端
壁との間に形成される第1室には、給油時の燃料タンク
からの蒸発燃料を導く蒸発燃料通路と、パージガスをエ
ンジンの吸気系に導出するパージガス通路とが接続さ
れ、第2吸着剤充填層とケーシングの一端壁との間に形
成される第2室は大気に開放され、第1および第2吸着
剤充填層とケーシングの他端壁との間には両吸着剤充填
装置に共通な第3室が形成される蒸発燃料処理装置にお
いて、第3室を大気に開放するが蒸発燃料通路とは遮断
する第1の切換状態と、第3室を大気とは遮断するが蒸
発燃料通路に連通させる第2の切換状態とを少なくとも
切換可能な切換制御弁手段を備えることを特徴とする。In order to achieve the above object, according to the first aspect of the present invention, an adsorbent for adsorbing evaporated fuel is filled in a cylindrical casing whose both ends are closed. The first and second adsorbent-filled layers are provided with a partition wall fixed to one end wall of the casing interposed therebetween, and are provided between one end face of the first adsorbent-filled layer and one end wall of the casing. The first chamber formed is connected to an evaporative fuel passage for guiding evaporative fuel from the fuel tank at the time of refueling, and a purge gas passage for guiding purge gas to an intake system of the engine. A second chamber formed between the first end wall and the other end wall of the casing is provided between the first and second adsorbent packed layers and the other end wall of the casing. In the evaporative fuel processing device to be formed, the third chamber is set to the atmosphere. Switching control valve means capable of at least switching between a first switching state in which the third chamber is opened but cut off from the fuel vapor passage and a second switching state in which the third chamber is cut off from the atmosphere but communicates with the fuel vapor passage is provided. It is characterized by the following.
【0007】また請求項2記載の発明は、上記請求項1
記載の発明の構成に加えて、第1吸着剤充填層での蒸発
燃料の吸着がほぼ完了したことを検出する検出器と、燃
料タンクへの給油時に前記検出器が第1吸着剤充填層で
の蒸発燃料の吸着がほぼ完了したことを検出するまでは
第1の切換状態とするが第1吸着剤充填層での蒸発燃料
の吸着がほぼ完了したことを検出器が検出してからは第
2の切換状態とするようにして切換制御弁手段の切換作
動を制御する制御手段とを備えることを特徴とする。[0007] The invention according to claim 2 provides the above-described claim 1.
In addition to the configuration of the invention described in the above, a detector for detecting that the adsorption of the evaporated fuel in the first adsorbent packed bed is almost completed, and the detector is a first adsorbent packed bed when the fuel is supplied to the fuel tank. The first switching state is set until it is detected that the adsorption of the evaporated fuel is almost completed, but after the detector detects that the adsorption of the evaporated fuel in the first adsorbent packed layer is almost completed, the first switching state is reached. And control means for controlling the switching operation of the switching control valve means so as to set the switching state to 2.
【0008】[0008]
【実施例】以下、図面により本発明の実施例について説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【0009】図1ないし図3は本発明の第1実施例を示
すものであり、図1は給油時前半の作動状態での蒸発燃
料処理装置の構成を示す図、図2は時間経過に伴う吸着
剤温度の変化を示す図、図3は給油時後半の作動状態で
の蒸発燃料処理装置の構成を示す図である。FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a diagram showing the configuration of an evaporative fuel processing apparatus in an operating state in the first half of refueling, and FIG. FIG. 3 is a diagram illustrating a change in the temperature of the adsorbent, and FIG. 3 is a diagram illustrating a configuration of the evaporated fuel processing apparatus in an operating state in the latter half of refueling.
【0010】先ず図1において、車両に搭載された燃料
タンクT内の上部空間には、二方向弁3が介装された第
1蒸発燃料通路1の一端が接続され、第1蒸発燃料通路
1の他端はキャニスタCの上部に接続される。また燃料
タンクTの上部空間には第2蒸発燃料通路2の一端が接
続されており、第2蒸発燃料通路2の他端もキャニスタ
Cの上部に接続される。しかも第2蒸発燃料通路2の中
間部には、給油時には開弁せしめられる電磁開閉弁4が
介設される。さらにキャニスタCの上部には、パージガ
ス制御弁6を有するパージガス通路5の一端が接続され
ており、このパージガス通路5の他端は、車両に搭載さ
れたエンジンEの吸気系7においてスロットル弁8より
も下流側に接続される。First, in FIG. 1, one end of a first evaporative fuel passage 1 in which a two-way valve 3 is interposed is connected to an upper space in a fuel tank T mounted on a vehicle. Is connected to the upper part of the canister C. One end of the second evaporative fuel passage 2 is connected to the upper space of the fuel tank T, and the other end of the second evaporative fuel passage 2 is also connected to the upper part of the canister C. In addition, an electromagnetic opening / closing valve 4 that is opened at the time of refueling is provided at an intermediate portion of the second evaporated fuel passage 2. Further, one end of a purge gas passage 5 having a purge gas control valve 6 is connected to an upper portion of the canister C. The other end of the purge gas passage 5 is connected to a throttle valve 8 in an intake system 7 of an engine E mounted on a vehicle. Is also connected to the downstream side.
【0011】二方向弁3は、燃料タンクTの内圧が大気
圧よりも所定値を超えて上昇したときに開弁するととも
に、燃料タンクTの内圧がキャニスタCの内圧よりも所
定値を超えて低下したときに開弁して燃料タンクTおよ
びキャニスタC間を連通させるものである。またキャニ
スタCからのパージガスを吸気系7にパージする際にキ
ャニスタC側が負圧になることもあるが、その場合には
二方向弁3は閉弁状態に保たれる。The two-way valve 3 opens when the internal pressure of the fuel tank T rises above a predetermined value above the atmospheric pressure, and when the internal pressure of the fuel tank T exceeds a predetermined value above the internal pressure of the canister C. When the pressure drops, the valve is opened to allow communication between the fuel tank T and the canister C. When the purge gas from the canister C is purged into the intake system 7, the pressure on the canister C side may become negative. In this case, the two-way valve 3 is kept closed.
【0012】キャニスタCは、軸方向両端を第1および
第2端壁11,12でそれぞれ閉塞された円筒状のケー
シング10を備えるものであり、該ケーシング10は軸
線を鉛直として車両に搭載される。このケーシング10
の第1端壁11すなわち上端壁には、第2端壁12すな
わち下端壁側に延びる仕切り壁13が固設される。而し
て第1端壁11からわずかに軸方向内方の位置でケーシ
ング10の内面および仕切り壁13の一側面には、蒸発
燃料の通過を許容する網部材21の周縁部が固定的に支
持され、該網部材21に対応する位置でケーシング10
の内面および仕切り壁13の他側面には、蒸発燃料の通
過を許容する網部材22の周縁部が固定的に支持され、
仕切り壁13の先端すなわち下端と第2端壁12との間
の中間部でケーシング10の内面には蒸発燃料の通過を
許容する網部材23の周縁部が固定的に支持される。而
して仕切り壁13の一側で網部材21,23間に蒸発燃
料を吸着する吸着剤たとえば活性炭が充填されて第1吸
着剤充填層14が形成され、仕切り壁13の他側で網部
材22,23間に吸着剤が充填されて第2吸着剤充填層
15が形成される。また第1吸着剤充填層14の一端面
とケーシング10の第1端壁11との間には第1室16
が形成され、第2吸着剤充填層15とケーシング10の
第1端壁11との間には第2室17が形成され、第1お
よび第2吸着剤充填層14,15の他端面とケーシング
10の第2端壁12との間には、両吸着剤充填層14,
15の他端面を共通に臨ませる第3室18が形成され
る。The canister C has a cylindrical casing 10 whose both ends in the axial direction are closed by first and second end walls 11 and 12, respectively. The casing 10 is mounted on a vehicle with the axis vertical. . This casing 10
A partition wall 13 extending toward the second end wall 12, ie, the lower end wall, is fixed to the first end wall 11, that is, the upper end wall. At a position slightly inward in the axial direction from the first end wall 11, a peripheral portion of the mesh member 21 that allows the passage of the fuel vapor is fixedly supported on the inner surface of the casing 10 and one side surface of the partition wall 13. The casing 10 is positioned at a position corresponding to the mesh member 21.
The inner peripheral surface of the partition member 13 and the other side surface of the partition member 13 are fixedly supported by a peripheral portion of a mesh member 22 that allows the passage of fuel vapor.
On the inner surface of the casing 10 at the front end of the partition wall 13, that is, between the lower end and the second end wall 12, a peripheral portion of a mesh member 23 that allows the passage of the evaporated fuel is fixedly supported. Thus, an adsorbent for adsorbing the evaporated fuel, such as activated carbon, is filled between the mesh members 21 and 23 on one side of the partition wall 13 to form the first adsorbent packed layer 14, and the mesh member is formed on the other side of the partition wall 13. The second adsorbent-filled layer 15 is formed by filling the adsorbent between 22 and 23. Further, a first chamber 16 is provided between one end surface of the first adsorbent packed layer 14 and the first end wall 11 of the casing 10.
Is formed, and a second chamber 17 is formed between the second adsorbent-filled layer 15 and the first end wall 11 of the casing 10, and the other end faces of the first and second adsorbent-filled layers 14, 15 and the casing 10 between the second end wall 12 and both adsorbent packed layers 14,
A third chamber 18 is formed so that the other end surfaces of the third chamber 15 face in common.
【0013】ケーシング10の第1端壁11には、第1
および第2蒸発燃料通路1,2が接続されるとともにパ
ージガス通路5が第1室16に通じるようにして接続さ
れ、第2室17は大気に開放される。The first end wall 11 of the casing 10 has a first
The purge gas passage 5 is connected to the first chamber 16 and the second chamber 17 is open to the atmosphere.
【0014】またケーシング10の第2端壁12には、
開放路24の一端が第1吸着剤充填層14の下方に対応
して接続されるとともに、補助蒸発燃料通路25の一端
が第2吸着剤充填層15の下方に対応して接続され、開
放路24の他端は大気に開放され、補助蒸発燃料通路2
5の他端は電磁開閉弁4よりも下流側で第2蒸発燃料通
路2に接続される。しかも開放路24には電磁開閉切換
弁26が介設され、補助蒸発燃料通路25には、前記電
磁開閉切換弁26とともに切換制御弁手段20 1 を構成
する電磁開閉切換弁27が介設される。The second end wall 12 of the casing 10 has
One end of the open path 24 corresponds to a position below the first adsorbent packed layer 14.
And one end of the auxiliary evaporative fuel passage 25
Are connected correspondingly below the second adsorbent packed layer 15 and open.
The other end of the discharge passage 24 is open to the atmosphere, and the auxiliary evaporative fuel passage 2
The other end of 5 is located downstream of the solenoid on-off valve 4 and has a second vaporized fuel passage.
It is connected to Road 2. In addition, electromagnetic open / close switching on the open path 24
A valve 26 is provided.
Switching control valve means 20 together with magnetic switching valve 26 1Configure
An electromagnetic open / close switching valve 27 is provided.
【0015】而して切換制御弁手段201 は、電磁開閉
切換弁26を開弁するとともに電磁開閉切換弁27を閉
弁して第3室18を大気に開放するが第2蒸発燃料通路
2とは遮断する第1の切換状態と、電磁開閉切換弁27
を開弁するとともに電磁開閉切換弁26を閉弁して第3
室18を大気とは遮断するが第2蒸発燃料通路2に連通
させる第2の切換状態と、両電磁開閉切換弁26,27
をともに閉弁して第3室18を大気から遮断するととも
に第2蒸発燃料通路2とも遮断する第3の切換状態とを
切換可能である。[0015] Thus by switching control valve means 20 1, the third chamber 18 to be opened to the atmosphere, but the second evaporative fuel path to close the solenoid on-off switching valve 27 while opening the electromagnetic on-off changeover valve 26 2 And the electromagnetic switching valve 27
And the electromagnetic open / close switching valve 26 is closed to open the third
A second switching state in which the chamber 18 is cut off from the atmosphere but communicates with the second evaporative fuel passage 2;
Can be switched to a third switching state in which the third chamber 18 is shut off from the atmosphere and the second evaporative fuel passage 2 is shut off.
【0016】電磁開閉弁4、パージガス制御弁6および
切換制御弁手段201 の開閉作動は、制御手段としての
電子制御ユニットECUにより制御されるものであり、
電子制御ユニットECUには、第1吸着剤充填層14で
の蒸発燃料の吸着がほぼ完了したことを検出するための
温度検出器S1 と、燃料タンクTに給油ガンGによる給
油が行なわれていることを検出するために給油管28に
付設された給油検出器29とが接続される。The electromagnetic valve 4, the opening and closing operation of the purge gas control valve 6 and the switching control valve means 20 1 is intended to be controlled by the electronic control unit ECU as a control unit,
The electronic control unit ECU, the temperature detector S 1 for detecting that the adsorption of the fuel vapor in the first adsorbent filling layer 14 is almost completed, it is performed refueling the fuel tank T by fueling gun G Is connected to a refueling detector 29 attached to the refueling pipe 28 in order to detect the presence of the fuel.
【0017】而して温度検出器S1 は、第1吸着剤充填
層14の第3室18寄りの部分に挿入されるものであ
り、第1吸着剤充填層14での蒸発燃料の吸着の進行に
応じた温度変化により、第1吸着剤充填層14での蒸発
燃料の吸着がほぼ完了したことを検出する。すなわち活
性炭等の吸着剤による蒸発燃料の吸着時には、図2で示
すように、蒸発燃料の吸着開始時から吸着剤の温度が上
昇するが蒸発燃料の吸着がほぼ完了した時点to からは
温度が低下するものであり、その最高温度到達時を温度
検出器S1 で検出することにより第1吸着剤充填層14
での吸着がほぼ完了したことを検出することができる。The temperature detector S 1 is inserted into a portion of the first adsorbent packed bed 14 near the third chamber 18, and detects the temperature of the fuel adsorbed by the first adsorbent packed bed 14. Based on the temperature change according to the progress, it is detected that the adsorption of the evaporated fuel in the first adsorbent packed bed 14 is almost completed. That is, when the adsorption of the fuel vapor with an adsorbent such as activated carbon, as shown in Figure 2, the temperature is from the time t o at which the adsorption is nearly completed, but the fuel vapor temperature of the adsorbent rises from the beginning adsorption of fuel vapor is intended to decrease, the first adsorbent filling layer 14 by detecting the time of maximum temperature at a temperature detector S 1
Can be detected that the adsorption is almost completed.
【0018】次にこの第1実施例の作用について説明す
ると、燃料タンクTへの給油ガンGによる給油時には、
電磁開閉弁4が開弁状態とされるとともにパージガス制
御弁6が閉弁状態とされ、切換制御弁手段201 は、電
磁開閉切換弁26を開弁するとともに電磁開閉切換弁2
7を閉弁して第3室18を大気に開放するが第2蒸発燃
料通路2とは遮断する第1の切換状態とされる。Next, the operation of the first embodiment will be described. When refueling the fuel tank T with the refueling gun G,
Purge control valve 6 is set to the closed state with the solenoid valve 4 is an open state, the switching control valve means 20 1, the electromagnetic on-off switching valve 2 while opening the electromagnetic on-off changeover valve 26
7 is closed to open the third chamber 18 to the atmosphere, but to the first switching state in which the third chamber 18 is disconnected from the second evaporated fuel passage 2.
【0019】この状態で燃料タンクTで発生した蒸発燃
料は、キャニスタCの第1室16に導入され、第1吸着
剤充填層14を矢印で示すように通過することにより、
吸着剤に吸着される。而して、第1吸着剤充填層14を
流過した後のガスの大部分は第3室18から開放路24
へと流出し、一部のガスは第1吸着剤充填層14から第
2吸着剤充填装置15側に流れる。In this state, the evaporated fuel generated in the fuel tank T is introduced into the first chamber 16 of the canister C, and passes through the first adsorbent-filled layer 14 as shown by an arrow.
Adsorbed by the adsorbent. Thus, most of the gas after flowing through the first adsorbent packed layer 14 is supplied from the third chamber 18 to the open channel 24.
And a part of the gas flows from the first adsorbent filled layer 14 to the second adsorbent filled device 15 side.
【0020】次いで温度検出器S1 により第1吸着剤充
填層14での蒸発燃料の吸着がほぼ完了したことが検出
されたときには、切換制御弁手段201 が、図3で示す
ように、電磁開閉切換弁26を閉弁するとともに電磁開
閉切換弁27を開弁して第3室18を大気から遮断する
が第2蒸発燃料通路2に連通する第2の切換状態とされ
る。この際、電磁開閉切換弁27の開弁作動が電磁開閉
切換弁26の閉弁作動に先立って行なわれ、電磁開閉切
換弁27の開弁作動後に所定時間が経過してから電磁開
閉切換弁26が閉弁作動せしめられる。[0020] When the temperature detector S 1 is the adsorption of the fuel vapor in the first adsorbent filling layer 14 has been substantially completed is detected then that switching control valve means 20 1, as shown in Figure 3, the electromagnetic The third opening / closing switching valve 26 is closed and the electromagnetic opening / closing switching valve 27 is opened to shut off the third chamber 18 from the atmosphere. However, the second switching state is established in which the third chamber 18 communicates with the second evaporated fuel passage 2. At this time, the opening / closing operation of the electromagnetic opening / closing switching valve 27 is performed prior to the closing operation of the electromagnetic opening / closing switching valve 26. Is operated to close the valve.
【0021】これにより、燃料タンクTからの蒸発燃料
が第2蒸発燃料通路2から補助蒸発燃料通路25を経て
第3室18に導入されることになる。而して電磁開閉切
換弁27の開弁作動に伴って第3室18に導入された蒸
発燃料が開放路24から外部に放出される前に、電磁開
閉切換弁26の閉弁作動が実行されるものであり、電磁
開閉切換弁27の開弁時期および電磁開閉切換弁26の
閉弁時期間に設定される上記所定時間は、極めて短時間
に設定されるものである。As a result, the fuel vapor from the fuel tank T is introduced from the second fuel vapor passage 2 into the third chamber 18 via the auxiliary fuel vapor passage 25. Thus, before the evaporated fuel introduced into the third chamber 18 is discharged from the open passage 24 to the outside with the opening operation of the electromagnetic opening / closing switching valve 27, the closing operation of the electromagnetic opening / closing switching valve 26 is executed. The predetermined time set between the valve opening timing of the electromagnetic switching valve 27 and the valve closing timing of the electromagnetic switching valve 26 is set to be extremely short.
【0022】第3室18に流入した蒸発燃料の大部分
は、第2室17が大気に開放した状態にあることから第
2吸着剤充填層15内を上方に流通し、この第2吸着剤
充填層15内の吸着剤により吸着されることになる。こ
の際、一部の蒸発燃料が第1吸着剤充填層14側に流れ
てもよい。Most of the evaporated fuel that has flowed into the third chamber 18 flows upward through the second adsorbent packed layer 15 because the second chamber 17 is open to the atmosphere. It will be adsorbed by the adsorbent in the packed bed 15. At this time, a part of the evaporated fuel may flow to the first adsorbent packed layer 14 side.
【0023】このように、第1吸着剤充填層14での吸
着がほぼ完了するまでは第1吸着剤充填層14を蒸発燃
料の大部分が流通し、また第1吸着剤充填層14での吸
着がほぼ完了した後には、蒸発燃料の大部分が第2吸着
剤充填層15を流通するようにしたことにより、燃料タ
ンクTへの給油時に比較的大量の蒸発燃料が燃料タンク
Tで発生しても、キャニスタCでの通気抵抗が許容値よ
りも大きくなることを防止することができる。たとえば
キャニスタCでの許容通気抵抗が100mmAqである
場合に、第1吸気剤充填層14および第2吸気剤充填層
15でそれぞれ通気抵抗が100mmAqとなるように
ケーシング10のL/Dを設定することが可能である。
すなわちキャニスタCのL/Dを従来よりも大きくする
ことが可能であり、給油時におけるキャニスタCの利用
率を大きくすることができる。As described above, most of the evaporated fuel flows through the first adsorbent packed layer 14 until the adsorption in the first adsorbent packed bed 14 is almost completed, After the adsorption is almost completed, most of the evaporated fuel flows through the second adsorbent packed layer 15, so that a relatively large amount of evaporated fuel is generated in the fuel tank T when the fuel is supplied to the fuel tank T. However, it is possible to prevent the ventilation resistance in the canister C from becoming larger than the allowable value. For example, when the permissible airflow resistance in the canister C is 100 mmAq, the L / D of the casing 10 is set so that the airflow resistance in each of the first intake agent filling layer 14 and the second intake agent filling layer 15 becomes 100 mmAq. Is possible.
That is, the L / D of the canister C can be made larger than before, and the utilization rate of the canister C during refueling can be increased.
【0024】車両の駐、停車時には、電磁開閉弁4が閉
弁されるとともに、切換制御弁手段201 が両電磁開閉
切換弁26,27をともに閉弁して第3室18を大気か
ら遮断するとともに第2蒸発燃料通路2とも遮断する第
3の切換状態とされる。これにより、燃料タンクTから
の蒸発燃料は二方向弁3を介してキャニスタCの第1室
16に導入され、比較的緩やかな流通速度で第1吸着剤
充填層14、第3室18および第2吸着剤充填層15を
経て第2室17に至るように流通し、従来のキャニスタ
と同様にしてHC成分が吸着される。したがって、従来
と同様にL/Dを充分に大きくすることができ、HC成
分のマイグレーション防止を図って蒸発燃料の充分な吸
着が可能となる。The parking of the vehicle, when the vehicle is stopped, the shut-off with the solenoid valve 4 is closed, the switching control valve means 20 1 is the third chamber 18 by both closed both electromagnetic switching selector valve 26 from the atmosphere At the same time, a third switching state is established in which the second evaporated fuel passage 2 is also shut off. As a result, the fuel vapor from the fuel tank T is introduced into the first chamber 16 of the canister C via the two-way valve 3, and the first adsorbent packed bed 14, the third chamber 18, and the second chamber 18 are formed at a relatively slow flow speed. It flows so as to reach the second chamber 17 via the two adsorbent filled layers 15, and the HC component is adsorbed in the same manner as in the conventional canister. Therefore, L / D can be made sufficiently large as in the prior art, and the migration of HC components can be prevented, so that the fuel vapor can be sufficiently adsorbed.
【0025】図4は本発明の第2実施例を示すものであ
り、上記第1実施例に対応する部分には同一の参照符号
を付す。FIG. 4 shows a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals.
【0026】ケーシング10の第2端壁12には通路3
0が接続されており、該通路30と、第2蒸発燃料通路
2に連なる補助蒸発燃料通路25′および大気との間に
は、第3室18を大気に開放するが第2蒸発燃料通路2
とは遮断する第1の切換状態と、第3室18を大気とは
遮断するが第2蒸発燃料通路2に連通させる第2の切換
状態と、第3室18を大気から遮断するとともに第2蒸
発燃料通路2とも遮断する第3の切換状態とを切換可能
な切換制御弁手段としての3ポート3位置電磁切換弁2
02 が設けられる。The second end wall 12 of the casing 10 has a passage 3
The third chamber 18 is opened to the atmosphere between the passage 30 and the auxiliary evaporative fuel passage 25 ′ connected to the second evaporative fuel passage 2 and the atmosphere.
A second switching state in which the third chamber 18 is cut off from the atmosphere but communicates with the second evaporative fuel passage 2; a second switching state in which the third chamber 18 is cut off from the atmosphere; 3-port 3-position electromagnetic switching valve 2 as switching control valve means capable of switching between a third switching state in which the evaporative fuel passage 2 is also shut off
0 2 is provided.
【0027】またケーシング10には、第3室18のH
C濃度を検出することにより第1吸着剤充填層14での
吸着がほぼ完了して第1吸着剤充填層14での破過が始
まったことを判定するHC検出器S2 が付設される。The casing 10 is provided with H in the third chamber 18.
Determining HC detector S 2 that breakthrough began in the first adsorbent filling layer 14 adsorbing in the first adsorbent filling layer 14 is substantially completed is attached by detecting the C concentration.
【0028】この第2実施例によっても、HC検出器S
2 の検出信号に応じて電子制御ユニットECUにより3
ポート3位置電磁切換弁202 の作動を切換制御するこ
とにより、上記第1実施例と同様の効果を奏することが
できる。According to the second embodiment, the HC detector S
3 by the electronic control unit ECU according to the detection signal of 2.
By switching control the operation of the port three-position electromagnetic switching valve 20 2, it is possible to obtain the same effect as in the first embodiment.
【0029】以上、本発明の実施例を詳述したが、本発
明は上記実施例に限定されるものではなく、特許請求の
範囲に記載された本発明を逸脱することなく種々の設計
変更を行なうことが可能である。Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.
【0030】たとえば第2蒸発燃料通路2において、補
助蒸発燃料通路25,25′の分岐部とキャニスタCの
第1室16との間に開閉弁が設けられていてもよく、ま
た第1吸着剤充填層14での蒸発燃料の吸着がほぼ完了
したことを検出する検出器ととして給油開始から設定時
間が経過するまでの時間を計時するタイマを用いるよう
にしてもよい。さらに本発明を、給油時だけ燃料タンク
Tからの蒸発燃料を吸着処理するようにした給油時専用
の蒸発燃料処理装置に適用することも可能である。For example, in the second evaporative fuel passage 2, an on-off valve may be provided between the branch portion of the auxiliary evaporative fuel passages 25 and 25 'and the first chamber 16 of the canister C. A timer that measures the time from the start of refueling to the elapse of a set time may be used as a detector that detects that the adsorption of the evaporated fuel in the packed bed 14 is almost completed. Further, the present invention can be applied to an evaporative fuel processing device dedicated to refueling in which the evaporated fuel from the fuel tank T is adsorbed only during refueling.
【0031】[0031]
【発明の効果】以上のように請求項1記載の発明は、両
端が閉塞された筒状のケーシング内には、蒸発燃料を吸
着する吸着剤がそれぞれ充填されて成る第1および第2
吸着剤充填層が、ケーシングの一端壁に固設された仕切
り壁を相互間に挟んで設けられ、第1吸着剤充填層の一
端面とケーシングの一端壁との間に形成される第1室に
は、給油時の燃料タンクからの蒸発燃料を導く蒸発燃料
通路と、パージガスをエンジンの吸気系に導出するパー
ジガス通路とが接続され、第2吸着剤充填層とケーシン
グの一端壁との間に形成される第2室は大気に開放さ
れ、第1および第2吸着剤充填層とケーシングの他端壁
との間には両吸着剤充填層に共通な第3室が形成される
蒸発燃料処理装置において、第3室を大気に開放するが
蒸発燃料通路とは遮断する第1の切換状態と、第3室を
大気とは遮断するが蒸発燃料通路に連通させる第2の切
換状態とを少なくとも切換可能な切換制御弁手段を備え
るので、給油時に第1および第2吸着剤充填層を切換え
て蒸発燃料を吸着させることにより、蒸発燃料の吸着剤
充填層での通気抵抗を比較的低く抑えて蒸発燃料を両吸
着剤充填層に充分に送り込めるようにして燃料タンクへ
の充分な給油が可能となる。As described above, according to the first aspect of the present invention, the first and second cylinders each having a tubular casing closed at both ends are filled with an adsorbent for adsorbing fuel vapor.
A first chamber formed between the one end surface of the first adsorbent packed layer and one end wall of the casing, the adsorbent packed layer being provided with a partition wall fixed to one end wall of the casing interposed therebetween; Is connected to an evaporative fuel passage for introducing evaporative fuel from the fuel tank at the time of refueling, and a purge gas passage for introducing purge gas to the intake system of the engine, and is provided between the second adsorbent packed layer and one end wall of the casing. The second chamber formed is open to the atmosphere, and a third chamber common to both the adsorbent-filled layers is formed between the first and second adsorbent-filled layers and the other end wall of the casing. In the apparatus, at least a first switching state in which the third chamber is opened to the atmosphere but cut off from the evaporative fuel passage, and a second switching state in which the third chamber is cut off from the atmosphere but communicated with the evaporative fuel passage are at least performed. Since switching control valve means is provided for switching, By switching the second adsorbent packed layer to adsorb the evaporated fuel, the airflow resistance of the evaporated fuel in the adsorbent packed bed is kept relatively low so that the evaporated fuel can be sufficiently fed to both adsorbent packed beds. As a result, sufficient fuel supply to the fuel tank becomes possible.
【0032】また請求項2記載の発明は、上記請求項1
記載の発明の構成に加えて、第1吸着剤充填層での蒸発
燃料の吸着がほぼ完了したことを検出する検出器と、燃
料タンクへの給油時に前記検出器が第1吸着剤充填層で
の蒸発燃料の吸着がほぼ完了したことを検出するまでは
第1の切換状態とするが第1吸着剤充填層での蒸発燃料
の吸着がほぼ完了したことを検出器が検出してからは第
2の切換状態とするようにして切換制御弁手段の切換作
動を制御する制御手段とを備えるので、第1および第2
吸着剤充填層の切換タイミングを適切に制御して、より
効果的な吸着が可能となる。The second aspect of the present invention is directed to the first aspect.
In addition to the configuration of the invention described in the above, a detector for detecting that the adsorption of the evaporated fuel in the first adsorbent packed bed is almost completed, and the detector is a first adsorbent packed bed when the fuel is supplied to the fuel tank. The first switching state is set until it is detected that the adsorption of the evaporated fuel is almost completed, but after the detector detects that the adsorption of the evaporated fuel in the first adsorbent packed layer is almost completed, the first switching state is reached. And control means for controlling the switching operation of the switching control valve means so as to set the first and second switching states.
By appropriately controlling the switching timing of the adsorbent packed layer, more effective adsorption becomes possible.
【図1】第1実施例の給油時前半の作動状態での蒸発燃
料処理装置の構成を示す図である。FIG. 1 is a diagram showing a configuration of an evaporative fuel processing device in an operating state in a first half of refueling time of a first embodiment.
【図2】時間経過に伴う吸着剤温度の変化を示す図であ
る。FIG. 2 is a diagram showing a change in adsorbent temperature over time.
【図3】給油時後半の作動状態での蒸発燃料処理装置の
構成を示す図である。FIG. 3 is a diagram illustrating a configuration of an evaporative fuel processing apparatus in an operating state in a latter half of refueling.
【図4】第2実施例の蒸発燃料処理装置の構成を示す図
である。FIG. 4 is a diagram illustrating a configuration of an evaporative fuel processing apparatus according to a second embodiment.
2・・・蒸発燃料通路 5・・・パージガス通路 7・・・吸気系 10・・・ケーシング 11,12・・・端壁 13・・・仕切り壁 14・・・第1吸着剤充填層 15・・・第2吸着剤充填層 16・・・第1室 17・・・第2室 18・・・第3室 201 ・・・切換制御弁手段 202 ・・・切換制御弁手段としての3ポート3位置電
磁切換弁 E・・・エンジン ECU・・・制御手段としての電子制御ユニット S1 ・・・温度検出器 S2 ・・・HC検出器 T・・・燃料タンク2 ... Evaporated fuel passage 5 ... Purge gas passage 7 ... Intake system 10 ... Casing 11, 12 ... End wall 13 ... Partition wall 14 ... First adsorbent packed bed 15 ... ..The second adsorbent packed layer 16: the first chamber 17 ... the second chamber 18 ... the third chamber 20 1 ... the switching control valve means 20 2 ... 3 as the switching control valve means the electronic control unit S 1 · · · temperature detector S 2 · · · HC detector T · · · fuel tank as a port three-position electromagnetic switching valve E · · · engine ECU · · · control means
───────────────────────────────────────────────────── フロントページの続き (72)発明者 若城 輝男 埼玉県和光市中央1丁目4番1号 株式 会社本田技術研究所内 (72)発明者 川上 智之 栃木県芳賀郡芳賀町芳賀台143番地 株 式会社ピーエスジー内 (56)参考文献 特開 平1−159455(JP,A) (58)調査した分野(Int.Cl.7,DB名) F02M 25/08 F02M 25/08 311 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Teruo Wakagi 1-4-1 Chuo, Wako-shi, Saitama Pref. Inside of Honda R & D Co., Ltd. (72) Inventor Tomoyuki Kawakami 143 Hagadai, Haga-cho, Haga-gun Tochigi Pref. (56) References JP-A-1-159455 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) F02M 25/08 F02M 25/08 311
Claims (2)
0)内には、蒸発燃料を吸着する吸着剤がそれぞれ充填
されて成る第1および第2吸着剤充填層(14,15)
が、ケーシング(10)の一端壁(11)に固設された
仕切り壁(13)を相互間に挟んで設けられ、第1吸着
剤充填層(14)の一端面とケーシング(10)の一端
壁(11)との間に形成される第1室(16)には、給
油時の燃料タンク(T)からの蒸発燃料を導く蒸発燃料
通路(2)と、パージガスをエンジン(E)の吸気系
(7)に導出するパージガス通路(5)とが接続され、
第2吸着剤充填層(15)とケーシング(10)の一端
壁(11)との間に形成される第2室(17)は大気に
開放され、第1および第2吸着剤充填層(14,15)
とケーシング(10)の他端壁(12)との間には両吸
着剤充填層(14,15)に共通な第3室(18)が形
成される蒸発燃料処理装置において、第3室(18)を
大気に開放するが蒸発燃料通路(2)とは遮断する第1
の切換状態と、第3室(18)を大気とは遮断するが蒸
発燃料通路(2)に連通させる第2の切換状態とを少な
くとも切換可能な切換制御弁手段(201 ,202 )を
備えることを特徴とする蒸発燃料処理装置。A tubular casing (1) having both ends closed.
First and second adsorbent packed layers (14, 15), each of which is filled with an adsorbent for adsorbing fuel vapor.
Are provided with a partition wall (13) fixed to one end wall (11) of the casing (10) interposed therebetween, and one end face of the first adsorbent packed layer (14) and one end of the casing (10) are provided. A first chamber (16) formed between the first chamber (16) and the wall (11) has an evaporative fuel passage (2) for introducing evaporative fuel from the fuel tank (T) at the time of refueling, and purge gas for intake of the engine (E). A purge gas passage (5) leading to the system (7) is connected;
A second chamber (17) formed between the second adsorbent-filled layer (15) and one end wall (11) of the casing (10) is opened to the atmosphere, and the first and second adsorbent-filled layers (14) are opened. , 15)
In the evaporative fuel treatment apparatus, a third chamber (18) common to both the adsorbent-filled layers (14, 15) is formed between the second chamber (18) and the other end wall (12) of the casing (10). 18) is opened to the atmosphere but is cut off from the fuel vapor passage (2).
Switching control valve means (20 1 , 20 2 ) capable of at least switching between the switching state of (1) and the second switching state of shutting off the third chamber (18) from the atmosphere but communicating with the evaporated fuel passage (2). An evaporative fuel treatment device comprising:
の吸着がほぼ完了したことを検出する検出器(S1 ,S
2 )と、燃料タンク(T)への給油時に前記検出器(S
1 ,S2 )が第1吸着剤充填層(14)での蒸発燃料の
吸着がほぼ完了したことを検出するまでは第1の切換状
態とするが第1吸着剤充填層(14)での蒸発燃料の吸
着がほぼ完了したことを検出器(S1 ,S2 )が検出し
てからは第2の切換状態とするようにして切換制御弁手
段(201 ,202 )の切換作動を制御する制御手段
(ECU)とを備えることを特徴とする請求項1記載の
蒸発燃料処理装置。2. Detectors (S 1 , S 1 ) for detecting that the adsorption of the evaporated fuel in the first adsorbent packed bed (14) is almost completed.
2 ) and the detector (S) when refueling the fuel tank (T).
1 , S 2 ) is in the first switching state until it is detected that the adsorption of the evaporated fuel in the first adsorbent packed bed (14) is almost completed, but the first adsorbent packed bed (14) does not. After the detectors (S 1 , S 2 ) detect that the adsorption of the evaporated fuel is almost completed, the switching operation of the switching control valve means (20 1 , 20 2 ) is performed by setting the second switching state. The evaporative fuel processing apparatus according to claim 1, further comprising control means (ECU) for controlling.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16185794A JP3240091B2 (en) | 1994-07-14 | 1994-07-14 | Evaporative fuel processing equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16185794A JP3240091B2 (en) | 1994-07-14 | 1994-07-14 | Evaporative fuel processing equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0828366A JPH0828366A (en) | 1996-01-30 |
JP3240091B2 true JP3240091B2 (en) | 2001-12-17 |
Family
ID=15743281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16185794A Expired - Fee Related JP3240091B2 (en) | 1994-07-14 | 1994-07-14 | Evaporative fuel processing equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3240091B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4147940B2 (en) * | 2002-12-26 | 2008-09-10 | トヨタ自動車株式会社 | Evaporative fuel processing device for internal combustion engine |
JPWO2012086529A1 (en) * | 2010-12-22 | 2014-05-22 | 株式会社マーレ フィルターシステムズ | Canister detection device |
-
1994
- 1994-07-14 JP JP16185794A patent/JP3240091B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH0828366A (en) | 1996-01-30 |
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