EP0756079A1 - Canister - Google Patents

Canister Download PDF

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Publication number
EP0756079A1
EP0756079A1 EP96111463A EP96111463A EP0756079A1 EP 0756079 A1 EP0756079 A1 EP 0756079A1 EP 96111463 A EP96111463 A EP 96111463A EP 96111463 A EP96111463 A EP 96111463A EP 0756079 A1 EP0756079 A1 EP 0756079A1
Authority
EP
European Patent Office
Prior art keywords
passage
canister
hose
port
intake
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.)
Withdrawn
Application number
EP96111463A
Other languages
German (de)
English (en)
French (fr)
Inventor
Shoichi Kaneko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Publication of EP0756079A1 publication Critical patent/EP0756079A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F02M25/0854—Details of the absorption canister

Definitions

  • the present invention relates to canisters that prevent fuel vapor produced in a fuel tank from being released into the atmosphere.
  • Canisters are employed to treat fuel vapors, which are produced in a fuel tank, and prevent the vapor from being released into the atmosphere.
  • a typical canister is provided with a case filled with adsorbent that adsorbs fuel vapor.
  • the case has a vapor port, a purge port, and an intake port.
  • the fuel vapor is drawn into the canister through the vapor port and purged into an engine intake passage through the purge port.
  • Ambient air is drawn into the canister through the intake port.
  • the fuel vapor produced in the fuel tank is temporarily collected by the adsorbent in the canister. Operation of the engine during purging causes negative pressure to separate the fuel vapor from the adsorbent and mix the vapor with the ambient air. The mixture is then drawn into the intake passage for combustion.
  • a hose is connected to an air hole.
  • the hose extends through a side rail and has an opening located at the inner side of a vehicle front side member.
  • the negative pressure produced during purging draws the ambient air into the canister through the hose.
  • the fuel vapor collected in the canister becomes surplus, the fuel vapor is discharged through the hose.
  • a hose 25 provided with an intake passage 26 and a releasing passage 27 has been proposed to cope with this problem.
  • the opening of the intake passage 26 is located above the opening of the releasing passage 27.
  • a check valve 28 is provided in the intake passage 26.
  • negative pressure produced in a canister case 29 opens the check valve 28 and tolerates the introduction of ambient air.
  • the difference in negative pressures in the passages 26, 27 prevents water from being drawn into the canister through the passage 27 even when its opening is submerged under water level.
  • a pressure increase in the canister case 29 closes the check valve 28 and releases fuel vapor from the releasing passage 27.
  • a canister is provided with a case which accommodates an adsorbent, a first port for introducing fuel vapor to the case, a second port for purging the fuel vapor accumulated in the case, and a third port for introducing ambient air to the case when the fuel vapor is charged.
  • the third port is coupled to a first passage and a second passage. Ambient air flows into the case through the first passage. The fuel vapor is released to the ambient atmosphere from the case through the second passage.
  • the canister characterized by that the fluid-flow resistance in the first passage is larger than the fluid-flow resistance in the second passage.
  • a canister 1 includes a cylindrical case 2 having a closed bottom, and a lid 3 closing the case 2.
  • the lid 3 has a vapor port 4 for drawing fuel vapor produced in a fuel tank into the canister 1.
  • the top end of the vapor port 4 is connected with a communication chamber 5, which is also provided in the lid 3.
  • the communication chamber 5 is connected with a connecting pipe 6 provided at the upper section of the lid 3.
  • the pipe 6 is connected to a fuel tank (not shown).
  • a check valve 7 is provided in the communication chamber 5 at the right side of the vapor port 4. Negative pressure in the fuel tank opens the relief valve 7.
  • a check valve 8 is provided in the vapor port 4 in order to control the pressure in the tank. The check valve 8 is opened when the pressure in the fuel tank becomes greater than a predetermined value. This allows the fuel vapor produced in the fuel tank to be drawn into the case 2. The check valve 8 is closed when the pressure in the fuel tank becomes lower than the predetermined value.
  • a purge port 9 is provided at the left side of the vapor port 4.
  • a check valve 10 is provided in the purge port 9.
  • a connecting pipe 11 is provided on the lid 3 and connected to an intake system through a purge pipe Pa. A difference of pressures in the case 2 and the chamber 5 opens the control valve 10 and enables the fuel vapor in the canister 1 to be purged into the intake system through the purge pipe Pa.
  • Filters 12 are arranged on the bottom of the case 2 and on the lower surface of the lid 3.
  • a baffle plate 13 is arranged in the case 2.
  • the baffle plate 13 includes a deflecting plate 14 supported by supports 15.
  • the baffle plate 15 is arranged to face toward the inner end of the vapor port 4.
  • the deflecting plate 14 deflects the flow of the fuel vapor introduced through the vapor port 4 and disperses the vapor throughout the case 2.
  • the case 2 is filled with activated charcoals 16, which collectively serve as an adsorbent. Only a small portion of the activated charcoals 16 is shown in Fig. 2.
  • a vapor releasing hose 18 is connected to the lower end of the intake port 17.
  • the hose 18 has an inner diameter D2 larger than an inner diameter D1 of the intake port 17.
  • the releasing hose 18 extends through a side rail 19.
  • the outlet 20 of the hose 18 is oriented downward at the inner side of the front fender of the vehicle.
  • the location of the outlet 20 is not necessarily restricted to the inner side of the front fender. It may be located within any other space defined within the construction of the vehicle.
  • the releasing hose 18 and the intake port 17 define a fuel vapor releasing passage, or a second passage.
  • a branch pipe 21 horizontally projects from the intake port 17.
  • an intake hose 22 is connected to the distal end of the branch pipe 21.
  • the intake hose 22 has an inner diameter D4 larger than an inner diameter D3 of the branch pipe 21.
  • the intake hose 22 is bent in a substantially L-shaped manner with its inlet 23 being oriented in an upward direction (Fig. 1).
  • the branch pipe 21 and the intake hose 22 define an air intake passage, or a first passage.
  • the dimensional relationship between the inner diameters D1, D2, D3, D4 of the associated intake port 17, the releasing hose 18, the branch hose 21, and the intake hose 22 is represented by the inequality of D2>D1>D4>D3.
  • the air intake passage constituted by the pipe 21 and the hose 22 has an effective length L1.
  • the fuel vapor releasing passage constituted by the hose 18 and the port 17 has an effective length L2.
  • an axis Q of the branch pipe 21 and an axis P of the intake port 17 intersect at point O.
  • the length L1 of the air intake passage refers to the length between point O and the distal end of the inlet 23 of the intake hose 22.
  • Length L2 of the fuel vapor releasing passage refers to the length between point O and the distal end of the inlet 20 of the releasing hose 18.
  • the above dimensional relationship of the inner diameters D1, D2, D3, D4 is influenced by the flow rate M of the fuel vapor drawn into the canister 1 through the vapor port 4, the length L1, and the length L2.
  • the inner diameter D3 of the branch pipe 21 and the inner diameter D1 of the intake port 17 are determined based on experiments.
  • the length L1 of the air intake passage and the length L2 of the fuel vapor releasing passage are predetermined in accordance with the dimensions required for assembly of the vehicle.
  • fuel vapor is delivered through the vapor port 4 into the canister 1 accommodating the activated charcoals 16 at a flow rate presumed to be maximum during actual operation.
  • the diameter D4 where the flow rate of the fuel vapor released from the intake hose 22 becomes lower than a reference value is then confirmed to determine the inner diameters D1, D2, D3, D4.
  • An increase of the fuel vapor pressure in the case 2 releases the fuel vapor from the case 2 through the intake port 17 and the outlet 20 of the releasing hose 18.
  • the fluid-flow resistance per a unit is large in the branch pipe 21 and the intake hose 22 when the fuel vapor is released since the inner diameters D3, D4 of the associated branch pipe 21 and the intake hose 22 are smaller than the diameters D1, D2 of the associated intake port 17 and the releasing hose 18. This suppresses the fuel vapor from being released into the atmosphere through the branch pipe 21 and the intake hose 22.
  • negative pressure in the case 2 of the canister 1 which may be caused by purging, results in a negative pressure difference when the outlet of the fuel vapor releasing passage is submerged. This draws ambient air into the case 2 through the intake hose 22 and the branch pipe 21. In this state, water is prevented from entering the case 2 through the outlet 20 of the releasing hose 18.
  • the inner diameters D3, D4 of the branch pipe 21 and the intake hose 22 are smaller than the inner diameter D1 of the intake port 17.
  • a restriction may be provided in at least either the branch pipe 21 or the intake hose 22 so that the fluid-flow resistance becomes greater than the intake port 17 and the releasing hose 18.
  • the effective length L1 of the air intake passage 21, 22 may be extended so that it becomes longer than the effective length L2 of the fuel vapor releasing passage 17, 18. This results in the fluid-flow resistance of the air intake passage 21, 22 becoming larger than that of the fuel vapor releasing passage 17, 18.
  • the intake hose 22 may be spirally wound in an upward direction in a manner that its inlet 23 is located at a higher position.
  • the distal section of the intake hose 22 is extended in an upward direction and then curved in a manner that its inlet 23 is oriented in a downward direction.
  • the shape of the intake hose 22 prevents foreign material from entering the hose 22. Accordingly, the structure of the second embodiment prevents water or dust from falling into the hose 22.
  • an air filter may be provided in the inlet 23 of the hose 22 to prevent foreign material from entering the hose 22.
  • the hose 22 may be either curved or linear.
  • the curved hose 22 having the air filter at its inlet 23 optimally prevents the entrance of foreign material that tends to come in through the inlet 23.
  • the dimensional relationship of the inner diameters D1, D2, D3, D4 are also influenced by the shape of the passages (the number of curves and corners). Hence, these factors may also be taken into consideration when determining the dimensional relationship of the inner diameters D1, D2, D3, D4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
EP96111463A 1995-07-26 1996-07-16 Canister Withdrawn EP0756079A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP190705/95 1995-07-26
JP19070595A JPH0942080A (ja) 1995-07-26 1995-07-26 キャニスタ

Publications (1)

Publication Number Publication Date
EP0756079A1 true EP0756079A1 (en) 1997-01-29

Family

ID=16262475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96111463A Withdrawn EP0756079A1 (en) 1995-07-26 1996-07-16 Canister

Country Status (2)

Country Link
EP (1) EP0756079A1 (ja)
JP (1) JPH0942080A (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1688610A2 (en) 2005-02-03 2006-08-09 Delphi Technologies, Inc. Fluid flow device for fuel evaporative emission control system
CN110173379A (zh) * 2019-05-22 2019-08-27 安徽江淮汽车集团股份有限公司 集成炭罐结构、燃油蒸发系统及汽车
CN114247486A (zh) * 2020-09-24 2022-03-29 上准微流体股份有限公司 微流体芯片及装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6901452B2 (ja) * 2018-10-23 2021-07-14 フタバ産業株式会社 キャニスタ
KR102603097B1 (ko) * 2022-12-28 2023-11-15 현성춘 단일 챔버의 부피 변화를 이용한 캐니스터

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734414C1 (de) * 1987-10-12 1989-05-18 Audi Ag Entlueftungseinrichtung fuer den Kraftstofftank eines Kraftfahrzeuges
JPH01227861A (ja) * 1988-03-07 1989-09-12 Toyota Central Res & Dev Lab Inc 燃料蒸発防止装置
DE3935209A1 (de) * 1989-10-23 1991-04-25 Holzer Walter Adsorbtionsfilter fuer brennstoffdaempfe
EP0425862A1 (de) * 1989-10-28 1991-05-08 Audi Ag Vorrichtung zum Entsorgen von Kraftstoffdämpfen in Kraftfahrzeugen
EP0451313A1 (de) * 1990-04-12 1991-10-16 Siemens Aktiengesellschaft Tankentlüftungssystem
EP0604320A1 (fr) * 1992-12-23 1994-06-29 Paul Journee S.A. Dispositif de filtration de vapeurs de carburant et agencement pour le remplissage d'un réservoir associé à un tel dispositif de filtration
DE4343654A1 (de) * 1993-12-21 1995-06-22 Bosch Gmbh Robert Verfahren und Anlage zur Tankentlüftung
US5427076A (en) * 1993-10-22 1995-06-27 Honda Giken Kogyo Kabushiki Kaisha Evaporative fuel-processing system for internal combustion engines for vehicles

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734414C1 (de) * 1987-10-12 1989-05-18 Audi Ag Entlueftungseinrichtung fuer den Kraftstofftank eines Kraftfahrzeuges
JPH01227861A (ja) * 1988-03-07 1989-09-12 Toyota Central Res & Dev Lab Inc 燃料蒸発防止装置
DE3935209A1 (de) * 1989-10-23 1991-04-25 Holzer Walter Adsorbtionsfilter fuer brennstoffdaempfe
EP0425862A1 (de) * 1989-10-28 1991-05-08 Audi Ag Vorrichtung zum Entsorgen von Kraftstoffdämpfen in Kraftfahrzeugen
EP0451313A1 (de) * 1990-04-12 1991-10-16 Siemens Aktiengesellschaft Tankentlüftungssystem
EP0604320A1 (fr) * 1992-12-23 1994-06-29 Paul Journee S.A. Dispositif de filtration de vapeurs de carburant et agencement pour le remplissage d'un réservoir associé à un tel dispositif de filtration
US5427076A (en) * 1993-10-22 1995-06-27 Honda Giken Kogyo Kabushiki Kaisha Evaporative fuel-processing system for internal combustion engines for vehicles
DE4343654A1 (de) * 1993-12-21 1995-06-22 Bosch Gmbh Robert Verfahren und Anlage zur Tankentlüftung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 552 (M - 903) 8 December 1989 (1989-12-08) *
TOYOTA TECHNICAL INFORMATION, no. 2178, 29 July 1987 (1987-07-29)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1688610A2 (en) 2005-02-03 2006-08-09 Delphi Technologies, Inc. Fluid flow device for fuel evaporative emission control system
CN110173379A (zh) * 2019-05-22 2019-08-27 安徽江淮汽车集团股份有限公司 集成炭罐结构、燃油蒸发系统及汽车
CN114247486A (zh) * 2020-09-24 2022-03-29 上准微流体股份有限公司 微流体芯片及装置

Also Published As

Publication number Publication date
JPH0942080A (ja) 1997-02-10

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