Fuel vapor treatment device

Abstract

To supply evaporated fuel having an appropriate concentration without performing complicated control in an evaporated fuel treatment device.SOLUTION: An evaporated fuel treatment device in one aspect of the present disclosure includes a first connection part, a second connection part, a first accommodation part, and a second accommodation part. The first connection part is configured so that first piping leading to an internal combustion engine is connected. The second connection part is configured so that second piping leading to a fuel tank is connected. The first accommodation part is disposed to communicate with the first connection part and the second connection part, and is configured to accommodate a first adsorbent. The second accommodation part is disposed to communicate with the first connection part via the first accommodation part, and is configured to accommodate a second adsorbent. Adsorption capacity of evaporated fuel exhibited by the first adsorbent is configured to be lower than that of evaporated fuel exhibited by the second adsorbent.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a fuel vapor treatment system. [Background technology]

[0002] For example, Patent Document 1 below proposes a technique in which an adsorbent with a relatively low adsorption capacity is placed in a chamber communicating with the atmosphere in order to prevent evaporated fuel from leaking into the atmosphere. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-083871 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology of Patent Document 1 has a problem in that the concentration of evaporated fuel tends to become high at the beginning of the purging operation when evaporated fuel is supplied from the canister to the internal combustion engine. In order to optimize the concentration of evaporated fuel at the beginning of the purging operation, control such as reducing the amount of purge air supplied is required, which tends to make the control complex.

[0005] One aspect of the present disclosure is to provide an evaporated fuel treatment device that can supply evaporated fuel at an appropriate concentration without complex control. [Means for solving the problem]

[0006] One aspect of the present disclosure is an evaporated fuel treatment device including a first connection portion, a second connection portion, a first housing portion, and a second housing portion. The first connection portion is configured to be connected to a first pipe connected to an internal combustion engine. The second connection portion is configured to be connected to a second pipe connected to a fuel tank. The first storage portion is arranged to communicate with the first connection portion and the second connection portion and is configured to store a first adsorbent. The second storage portion is arranged to communicate with the first connection portion via the first storage portion and is configured to store a second adsorbent. The adsorption capacity of the first adsorbent for evaporated fuel is configured to be lower than the adsorption capacity of the second adsorbent for evaporated fuel.

[0007] Here, the supply of evaporated fuel from the evaporated fuel treatment device to the internal combustion engine is referred to as a purge operation. In the configuration of the present disclosure, the fuel vapor supplied to the first connection part at the beginning of the purge operation is mainly fuel vapor desorbed from the first adsorbent. According to the configuration of the present disclosure, because the first adsorbent has low adsorption capacity, the concentration of evaporated fuel is lower than when the first adsorbent has high adsorption capacity for evaporated fuel. Therefore, it is possible to prevent highly concentrated fuel vapor from being supplied at the beginning of the purge operation.

[0008] In one embodiment of the present disclosure, the volume of the first adsorbent may be configured to be smaller than the volume of the second adsorbent. With this configuration, the absolute amount of fuel that can be adsorbed by the first adsorbent can be reduced, and therefore, it is possible to prevent highly concentrated fuel vapor from being supplied at the beginning of the purge operation.

[0009] An embodiment of the present disclosure may further include a housing and at least one filter. The first and second storage sections may form part of the housing. The first and second adsorbents may be disposed adjacent to each other within the housing and in communication with each other via the filter. According to this configuration, the first adsorbent and the second adsorbent can be housed in one housing with at least one filter sandwiched therebetween.

[0010] In one aspect of the present disclosure, the first connecting portion and the second connecting portion may be disposed adjacent to each other on the same surface of the housing. With this configuration, the fuel vapor can be adsorbed and desorbed from the same direction.

[0011] In one aspect of the present disclosure, the filter may be arranged parallel to an outer wall surface of the housing, which is a surface on which the first connecting portion and the second connecting portion are arranged adjacent to each other.

[0012] According to this configuration, the first adsorbent and the second adsorbent can be aligned along the filter, which makes it less likely that gaps that become dead space will occur between the first adsorbent and the second adsorbent.

[0013] One aspect of the present disclosure may further include a partition plate configured to separate a space on the first connection portion side from a space on the second connection portion side inside the housing. According to this configuration, the partition plate can limit the path of evaporated fuel moving between the space on the first connection side and the space on the second connection side inside the housing. For example, if the first connection part and the second connection part are arranged adjacent to each other on the same surface of the housing, the partition plate can lengthen the path from the first connection part to the second connection part. In this case, it is possible to prevent highly concentrated evaporated fuel supplied via the second connection part from being immediately supplied to the internal combustion engine via the first connection part.

[0014] One aspect of the present disclosure may further include a first housing and a second housing. The first housing may include a first housing portion. The second housing may include a second housing portion. The first housing may include a third connecting portion and the first connecting portion. The third connecting portion is configured to be connected to a connecting pipe for connecting the first housing portion and the second housing portion. The second housing may include a fourth connecting portion to which the connecting pipe is connected, and the second connecting portion.

[0015] According to this configuration, even if the first container and the second container are provided in different housings, it is possible to prevent high-concentration evaporated fuel from being supplied. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view of an evaporated fuel treatment device according to an embodiment; [Figure 2] 10 is a graph showing the relationship between the duration of a purge operation and the concentration of evaporated fuel. [Figure 3] FIG. 4 is a cross-sectional view of a first modified example of an evaporated fuel treatment device. [Figure 4] FIG. 10 is a cross-sectional view of a second modified example of an evaporated fuel treatment device. [Figure 5] FIG. 10 is a cross-sectional view of a fuel vapor treatment device according to a third modified example. [Figure 6] FIG. 10 is a cross-sectional view of an evaporated fuel treatment device according to a fourth modified example. [Figure 7] FIG. 10 is a cross-sectional view of an evaporated fuel treatment device according to a fifth modified example. [Figure 8] FIG. 10 is a cross-sectional view of an evaporated fuel treatment device according to a sixth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [1. Embodiment] [1-1. Correspondence between the configuration of the embodiment and the configuration of the present disclosure] The purge port 22 and the separate purge port 22B of the embodiment correspond to an example of a first connection portion of the present disclosure, the charge port 21 of the embodiment corresponds to an example of a second connection portion of the present disclosure, the purge port 22 of the embodiment corresponds to an example of a third connection portion of the present disclosure, and the connection port 22D of the embodiment corresponds to an example of a fourth connection portion of the present disclosure.

[0018] The main body case 2 of the embodiment corresponds to an example of a housing of the present disclosure, the separate case 50 of the embodiment corresponds to an example of a first housing of the present disclosure, and the main body case 2 of the embodiment corresponds to an example of a second housing of the present disclosure. The filters 33 and 34 and the separation wall 29 of the embodiment correspond to an example of a boundary surface of the present disclosure.

[0019] [1-2.Configuration] 1 has a function as a known canister. That is, it has a function of adsorbing and desorbing evaporated fuel generated in a fuel tank (not shown) of a vehicle. The evaporated fuel processing device 1A has a main body case 2.

[0020] The main body case 2 is a case that forms an internal space. The main body case 2 is made of, for example, synthetic resin. However, the material of the main body case 2 is not limited to this. The main body case 2 includes a charge port 21 and a purge port 22. The main body case 2 may also include an atmospheric port 23. The ports 21 to 23 are arranged on the same side of the main body case 2 (for example, the upper side in FIG. 1). In particular, the purge port 22 and the charge port 21 are arranged adjacent to each other on the same outer surface of the main body case 2.

[0021] The ports 21 to 23 are arranged so that their port orientations are the same. The port orientation refers to the direction in which gas is introduced into or discharged from the ports 21 to 23. The ports 21 to 23 are configured to guide gas in the same direction.

[0022] The gas referred to here is a gas that flows inside the evaporated fuel processing device 1A and may contain air and evaporated fuel. Hereinafter, the side of the main body case 2 on which the charge port 21, the purge port 22, and the atmospheric port 23 are provided will be referred to as the port side. The main body case 2 has an opening 26 on the side opposite the port side. The opening 26 is closed by a cap 27 that functions as a lid.

[0023] The charge port 21 is configured to be connected to a second pipe 21A that is connected to a fuel tank of the vehicle. The charge port 21 is configured to take the evaporated fuel generated in the fuel tank into the evaporated fuel processing device 1A.

[0024] The purge port 22 is configured to be connected to a first pipe 22A that is connected to an internal combustion engine such as a vehicle engine. The first pipe 22A may be connected to an intake pipe (not shown) via a purge valve (not shown). The purge port 22 is configured to discharge the evaporated fuel in the evaporated fuel processing device 1A from the evaporated fuel processing device 1A and supply it to the internal combustion engine.

[0025] The atmospheric port 23 is open to the atmosphere. The atmospheric port 23 releases the gas from which the evaporated fuel has been removed into the atmosphere. The atmospheric port 23 also takes in external gas (i.e., purge gas) to desorb the evaporated fuel adsorbed by the evaporated fuel treatment device 1A (i.e., purge operation).

[0026] The internal space of the main body case 2 is divided into a first chamber 2A and a second chamber 2B. The first chamber 2A is, for example, substantially rectangular or cylindrical. The port-side end of the first chamber 2A is connected to a charge port 21 and a purge port 22.

[0027] The main body case 2 includes a first storage section 2C and a second storage section 2D. The first storage section 2C forms part of the first chamber 2A, and is disposed so that the internal space formed by the first storage section 2C communicates with the purge port 22 and the charge port 21. The first storage section 2C is configured to store a first adsorbent 41 in its internal space.

[0028] The second storage section 2D forms a part of the first chamber 2A, and is disposed so that the internal space formed by the second storage section 2D communicates with the purge port 22 via the internal space formed by the first storage section 2C. The second storage section 2D is configured to accommodate a second adsorbent 42. The second chamber 2B accommodates a third adsorbent 43.

[0029] As an example, the adsorbents 41 to 43 are aggregates of multiple pellets. The pellets are granular activated carbon. The pellets are produced by kneading powdered activated carbon with a binder and forming the mixture into a predetermined shape. Note that an adsorbent other than pellets, such as powdered activated carbon, may also be placed in the first chamber 2A.

[0030] Here, the adsorption capacity of the first adsorbent 41 for evaporative fuel is configured to be lower than the adsorption capacity of the second adsorbent 42. The adsorption capacity of the third adsorbent 43 for evaporative fuel is arbitrary, but can be configured to be the same as the adsorption capacity of the second adsorbent 42, for example. The adsorbents 41-43 may contain a diluent that has relatively little ability to adsorb evaporative fuel. When the adsorbents 41-43 contain a diluent, the adsorption capacity of the adsorbents 41-43 for evaporative fuel that contain the diluent is configured as described above.

[0031] The adsorption capacity of the vaporized fuel refers to the amount of fuel adsorbed per unit volume of the adsorbent. For example, the effective butane working capacity (BWC), particularly the ASTM BWC (Butane Working Capacity according to ASTM D5228), can be used as the adsorption capacity of the vaporized fuel. The adsorption capacity of the first adsorbent 41 for adsorbing fuel vapor is set to a BWC value of 1 to 8 g / dL, and the adsorption capacity of the second adsorbent 42 for adsorbing fuel vapor is set to a BWC value of 11 to 20 g / dL.

[0032] A first filter 32 is disposed at the port-side end of the first chamber 2A. In this embodiment, the filters 32 to 34, 37, and 38 are made of a fibrous or mesh material that allows gas containing evaporated fuel to pass through and prevents the adsorbents 41 to 43 from passing through. The filters 32 to 34, 37, and 38 can be made of, for example, a fibrous synthetic resin material, metal, or mesh-like metal material.

[0033] The second filter 33 is disposed between the first adsorbent 41 and the second adsorbent 42 in the first chamber 2A. That is, the first adsorbent 41 and the second adsorbent 42 are disposed adjacent to each other inside one main body case 2 and communicate with each other via the second filter 33. In other words, the first adsorbent 41 and the second adsorbent 42 are disposed so as to sandwich a boundary surface (here, the second filter 33) parallel to the outer wall surface of the main body case 2.

[0034] A third filter 34 is disposed at the end of the first chamber 2A on the cap 27 side. Between the first filter 32 and the third filter 34, a first adsorbent 41, a second filter 33, and a second adsorbent 42 are disposed in this order.

[0035] The volume of the first adsorbent 41 is smaller than the volume of the second adsorbent 42 and the volume of the third adsorbent 43. The volume of the first adsorbent 41 is about 1 / 5 the volume of the second adsorbent 42 and about 1 / 2 the volume of the third adsorbent 43.

[0036] The end of the first chamber 2A on the cap 27 side is connected to the second chamber 2B. Inside the main body case 2, gases such as gas containing evaporated fuel can travel between the first chamber 2A and the second chamber 2B. The first chamber 2A and the second chamber 2B are separated by a separation wall 29. The separation wall 29 is a plate-shaped member arranged approximately parallel to the side surface of the main body case 2.

[0037] The second chamber 2B is an elongated space extending from the end on the cap 27 side to the atmospheric port 23 side. As an example, the second chamber 2B has a substantially rectangular parallelepiped shape or a cylindrical shape. A first filter 37 is disposed at the end on the port side of the second chamber 2B, and a second filter 38 is disposed at the end on the cap 27 side. A third adsorbent 43 is disposed between the first filter 37 and the second filter 38 in the second chamber 2B.

[0038] [1-3.Effects] According to the embodiment described above in detail, the following effects are achieved. (1a) In the evaporated fuel treatment device 1A, the purge port 22 is configured to be connected to a first pipe 22A that is connected to an internal combustion engine. The charge port 21 is configured to be connected to a second pipe 21A that is connected to a fuel tank. The first storage unit 2C is arranged to communicate with the purge port 22 and the charge port 21, and is configured to store a first adsorbent 41. The internal space of the second storage unit 2D is arranged to communicate with the purge port 22 via the internal space of the first storage unit 2C, and is configured to store a second adsorbent 42. The adsorption capacity of the first adsorbent 41 for evaporated fuel is configured to be lower than the adsorption capacity of the second adsorbent 42.

[0039] According to the configuration of the present disclosure, the first adsorbent 41 has low adsorption capacity, resulting in a lower concentration of evaporated fuel than when the first adsorbent 41 has a high adsorption capacity for evaporated fuel. For example, FIG. 2 shows a graph comparing the evaporated fuel treatment device 1A (invention) of the above embodiment with a configuration (conventional device) in which the second adsorbent 42 is used in both the first storage section 2C and the second storage section 2D. In FIG. 2, the horizontal axis represents the time after the start of the purge operation, and the vertical axis represents the concentration of evaporated fuel. This graph shows that the concentration of evaporated fuel in the inventive device is lower than in the conventional device immediately after the start of the purge operation. This prevents highly concentrated fuel vapor from being supplied at the beginning of the purge operation.

[0040] (1b) In one embodiment of the present disclosure, the volume of the first adsorbent 41 is configured to be smaller than the volume of the second adsorbent 42. With this configuration, the absolute amount of fuel that can be adsorbed by the first adsorbent 41 can be reduced, and therefore, it is possible to prevent highly concentrated fuel vapor from being supplied at the beginning of the purging operation.

[0041] (1c) One embodiment of the present disclosure further includes one main body case 2 and at least one filter 33. The first storage section 2C and the second storage section 2D constitute part of the single main body case 2. The first adsorbent 41 and the second adsorbent 42 are arranged adjacent to each other inside the single main body case 2 and in communication with each other via the filter 33.

[0042] According to this configuration, the first adsorbent 41 and the second adsorbent 42 can be accommodated in one main body case 2 with at least one filter 33 sandwiched therebetween. Therefore, the filter 33 can prevent the first adsorbent 41 and the second adsorbent 42 from mixing. Also, it can facilitate the formation of an interface between the first adsorbent 41 and the second adsorbent 42.

[0043] (1d) In one embodiment of the present disclosure, the purge port 22 and the charge port 21 are arranged adjacent to each other on the same surface of the main body case 2. With this configuration, the fuel vapor can be adsorbed and desorbed from the same direction of the main body case 2.

[0044] (1e) In one aspect of the present disclosure, the second filter 33 is disposed parallel to the outer wall surface of the main body case 2, which is the surface on which the purge port 22 and the charge port 21 are disposed adjacent to each other. With this configuration, the first adsorbent 41 and the second adsorbent 42 can be aligned along the second filter 33, making it less likely that gaps that could become dead space will occur between the first adsorbent 41 and the second adsorbent 42.

[0045] 2. Other Embodiments Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0046] (2a) In the above embodiment, the first chamber 2A is not divided into compartments. However, the present invention is not limited to this. For example, a partition plate 30A may be provided to divide the first chamber 2A, as in the first modified example of an evaporated fuel treatment device 1B shown in FIG. 3. The partition plate 30A is configured to separate the space on the purge port 22 side from the space on the charge port 21 side inside the main body case 2.

[0047] More specifically, the partition plate 30A is formed in a rectangular plate shape. The partition plate 30A is arranged so that the upper side, which is one side of the rectangle, contacts the inner surface of the main body case 2 on the charge port 21 and purge port 22 side. Furthermore, the two sides adjacent to the upper side are arranged so that they contact both side surfaces of the inner surface of the main body case 2. Furthermore, the lower side, which is the side opposite the upper side, is arranged inside the first adsorbent 41. The first filter 32 is arranged on both sides of the partition plate 30A, sandwiching the partition plate 30A therebetween. The lower side of the partition plate 30A is located "inside the first storage section 2C, particularly between the first filter 32 and the second filter 33." Furthermore, the lower side of the partition plate 30A is arranged so that it abuts against the first adsorbent 41 without touching the second filter 33.

[0048] With this configuration, the provision of partition plate 30A makes it possible to restrict the path of evaporated fuel moving between the space on the purge port 22 side and the space on the charge port 21 side inside main body case 2. When purge port 22 and charge port 21 are arranged adjacent to each other on the same surface of main body case 2, as in this embodiment, the provision of partition plate 30A makes it possible to lengthen the path from purge port 22 to charge port 21. In this case, it is possible to prevent highly concentrated evaporated fuel supplied via charge port 21 from being immediately supplied to purge port 22.

[0049] (2b) In one aspect of the present disclosure, a partition plate 30B may be provided, as in a second modified example of an evaporated fuel processing device 1C shown in FIG. 4. The partition plate 30B has a lower side that faces the upper side and extends beyond the second filter 33, and is disposed inside the second adsorbent 42. The first adsorbent 41 and the second filter 33 are disposed only in the space on the purge port 22 side of the partition plate 30B. The second adsorbent 42 is disposed on the charge port 21 side of the partition plate 30B and on the cap 27 side of the second filter 33. As shown in FIG. 4, the first storage section 2C communicates with the charge port 21 via the second storage section 2D.

[0050] (2c) In one embodiment of the present disclosure, a partition plate 30C may be provided, as in a third modified fuel vapor treatment device 1D shown in FIG. 5. The partition plate 30C is configured by extending the partition plate 30A of the first modified example shown in FIG. 3 so that it extends beyond the second filter 33. The first filter 32, the second filter 33, and the first adsorbent 41 are disposed on both sides of the partition plate 30C, sandwiching the partition plate 30C therebetween. The lower edge of the partition plate 30C is located "inside the second storage section 2D, particularly between the second filter 33 and the third filter 34." The lower edge of the partition plate 30C is disposed so as to abut against the second adsorbent 42 without contacting the third filter 34. The lower edge of the partition plate 30C also does not contact the cap 27.

[0051] (2d) In one embodiment of the present disclosure, as in a fourth modified example of an evaporated fuel treatment device 1E shown in Figure 6, only the first adsorbent 41 may be disposed in the first chamber 2A. In this case, the second chamber 2B may be disposed with a third adsorbent 43 configured similarly to the second adsorbent 42.

[0052] (2e) In one aspect of the present disclosure, as in a fifth modified example of an evaporated fuel treatment device 1F shown in FIG. 7, any module may be connected to the atmospheric port 23 (not shown in FIG. 7). For example, in the example shown in FIG. 7, an activated carbon unit 60 is provided. The activated carbon unit 60 includes a port portion 23A that connects the inside and outside of the activated carbon unit 60, and an adsorbent 61 disposed inside the activated carbon unit 60. The adsorbent 61 is, for example, honeycomb activated carbon, fibrous activated carbon, or the like.

[0053] Note that, for example, an ELCM (that is, an Evaporative Leak Check Module) or the like may be provided as an optional module disposed in the atmospheric port 23. The ELCM is a module for performing a leak check of the evaporated fuel treatment device 1A.

[0054] (2f) In one aspect of the present disclosure, a separate case 50 may be attached to the purge port 22, as in a sixth modified example of an evaporated fuel treatment device 1G shown in FIG. 8. The sixth modified example of the evaporated fuel treatment device 1G includes the separate case 50 and a main body case 2. The separate case 50 includes a first storage section 2C. The main body case 2 includes a second storage section 2D.

[0055] The first storage section 2C stores a first adsorbent 41, and the second storage section 2D stores a second adsorbent 42. In this case, the first storage section 2C forms the internal space of the separate case 50, and the second storage section 2D forms the internal space of the first chamber 2A as a whole. As shown in Fig. 8, the first storage section 2C communicates with the charge port 21 via the second storage section 2D.

[0056] The separate case 50 further includes a separate purge port 22B and a connection port 22D. A connection pipe 22C for connecting the separate case 50 and the main case 2 is configured to be connected to the separate purge port 22B. An end of the connection pipe 22C is connected to the connection port 22D.

[0057] In the main body case 2, the end of the connecting pipe 22C that is not connected to the connection port 22D is configured to be connected to the purge port 22. According to this configuration, even if the first container 2C is provided in the separate case 50 and the second container 2D is provided in the main body case 2, it is possible to prevent high-concentration evaporated fuel from being supplied.

[0058] (2g) Multiple functions of one component in the above embodiments may be realized by multiple components, or one function of one component may be realized by multiple components. Also, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0059] (2h) In addition to the above-described fuel vapor processing devices 1A to 1G, the present disclosure can also be realized in various forms, such as a system including the fuel vapor processing devices 1A to 1G as components, a fuel vapor processing method, and the like.

[0060] [Technical idea disclosed in this specification] [Item 1] An evaporated fuel treatment device, a first connection portion configured to be connected to a first pipe leading to an internal combustion engine; a second connection portion configured to be connected to a second pipe leading to a fuel tank; a first storage section arranged to communicate with the first connection section and the second connection section and configured to store a first adsorbent; a second storage section arranged to communicate with the first connection section via the first storage section and configured to store a second adsorbent; Equipped with The adsorption capacity of the first adsorbent for the evaporated fuel is lower than the adsorption capacity of the second adsorbent for the evaporated fuel. Fuel vapor treatment device. [Item 2] The evaporated fuel treatment device according to item 1, The volume of the first adsorbent is smaller than the volume of the second adsorbent. Evaporative fuel treatment device. [Item 3] The evaporated fuel treatment device according to item 1 or 2, Further comprising a housing and at least one filter; the first housing portion and the second housing portion constitute a part of the single housing, The first adsorbent and the second adsorbent are disposed adjacent to each other inside the single housing and in communication with each other via the filter. Fuel vapor treatment device. [Item 4] Item 3. The fuel vapor treatment device according to item 3, The first connection portion and the second connection portion are disposed adjacent to each other on the same surface of the housing. Fuel vapor treatment device. [Item 5] The evaporated fuel treatment device according to item 3 or 4, The filter is disposed parallel to the outer wall surface of the housing, which is the surface on which the first connection portion and the second connection portion are disposed adjacent to each other. Fuel vapor treatment device. [Item 6] The evaporated fuel treatment device according to any one of items 3 to 5, a partition plate configured to separate a space on the first connection portion side from a space on the second connection portion side inside the housing; The evaporated fuel treatment device further comprises: [Item 7] The evaporated fuel treatment device according to item 1, a first housing including the first storage section; a second housing including the second housing portion; Furthermore, the first housing includes a third connection portion to which a connection pipe for connecting the first housing portion and the second housing portion is connected, and the first connection portion; The second housing includes a fourth connection portion to which the connection pipe is connected and the second connection portion. Fuel vapor treatment device. [Explanation of symbols]

[0061] 1A to 1G...evaporative fuel treatment device, 2...main body case, 2C...first storage section, 2D...second storage section, 21...charge port, 21A...second piping, 22...purge port, 22A...first piping, 22B...separate purge port, 22C...connecting pipe, 22D...connecting port, 23...atmospheric port, 29...separation wall, 30A to 30C...partition plates, 32 to 34, 37, 38...filter, 41...first adsorbent, 42...second adsorbent, 43...third adsorbent, 50...separate case, 60...activated carbon unit, 61...adsorbent.

Claims

1. An evaporated fuel treatment device, The device includes a first chamber and a second chamber, The first chamber is a first connection portion configured to be connected to a first pipe leading to an internal combustion engine; a second connection portion configured to be connected to a second pipe leading to a fuel tank; a first storage section arranged to communicate with the first connection section and the second connection section and configured to store a first adsorbent; a second storage section arranged to communicate with the first connection section via the first storage section and configured to store a second adsorbent; Equipped with Further comprising a housing and at least one filter; the first housing portion and the second housing portion constitute a part of the single housing, the first adsorbent and the second adsorbent are arranged adjacent to each other inside the single housing and in communication with each other via the filter, the second chamber is formed with an atmospheric port communicating with the atmosphere and configured to accommodate a third adsorbent; The effective butane working capacity (BWC) of the first adsorbent is lower than the effective butane working capacity (BWC) of the second adsorbent. Fuel vapor treatment device.

2. The fuel vapor treatment device according to claim 1, The volume of the first adsorbent is smaller than the volume of the second adsorbent. Fuel vapor treatment device.

3. 3. The fuel vapor treatment device according to claim 1, The volume of the first adsorbent is smaller than the volumes of the second adsorbent and the third adsorbent. Fuel vapor treatment device.

4. 3. The fuel vapor treatment device according to claim 1, The first connection portion and the second connection portion are disposed adjacent to each other on the same surface of the housing. Fuel vapor treatment device.

5. The fuel vapor treatment device according to claim 4, The filter is disposed parallel to the outer wall surface of the housing, which is the surface on which the first connection portion and the second connection portion are disposed adjacent to each other. Fuel vapor treatment device.

6. 3. The fuel vapor treatment device according to claim 1, a partition plate configured to separate a space on the first connection portion side from a space on the second connection portion side inside the housing; The evaporated fuel treatment device further comprises:

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