JPH01347A - Evaporated fuel processing equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is directed to adsorption treatment of evaporated fuel in a fuel storage chamber such as a fuel tank of a vehicle to prevent the evaporated fuel from being directly released into the atmosphere. Evaporative fuel treatment device (hereinafter referred to as “canister”)
It is called. ) regarding.

[Prior Art] Conventionally, as shown in, for example, Utility Model Publication No. 59-5177, a canister has been connected to the fuel tank in order to prevent the naturally evaporated fuel in the fuel tank from directly dissipating into the atmosphere. It is known that evaporated fuel is adsorbed by a fuel adsorbent such as activated carbon contained in a canister.

However, since the canister disclosed in the above-mentioned publication collects evaporated fuel naturally evaporated within the fuel tank, it has a low adsorption capacity and is relatively small.

On the other hand, in recent years, it has been found that the fuel generated during gasoline refueling has an adverse effect on air pollution and the human body, and it has become necessary to treat the evaporated fuel generated during refueling as well.

As a countermeasure to this problem, if an attempt is made to adsorb evaporated fuel using a canister with the same configuration as in the past, since a large amount of evaporated fuel is generated during refueling, a large amount of fuel adsorption material is required, and the canister must be made larger. There was a problem in that it was difficult to install it on an actual vehicle.

Further, the evaporated fuel generated during refueling needs to be adsorbed in a short period of time, and if the evaporated fuel is adsorbed in a short period of time, the temperature of the fuel adsorbing material will rise due to the heat of adsorption, resulting in a decrease in adsorption capacity.

[Problems to be solved by the invention]Recently, it has been found that the temperature of the canister affects the adsorption/desorption performance; cooling the canister improves the adsorption performance, and conversely, warming the canister reduces the amount of adsorbed fuel. It has been found that the withdrawal performance of

However, the structure and mounting location of the canister in the past has not been given much consideration from a thermal standpoint, and has simply been influenced by the ambient atmospheric temperature at the location where the canister is mounted.

The present invention aims to provide an evaporative fuel processing device that has a simple configuration, improves adsorption/separation ability, and does not require an increase in size.

[Means for Solving the Problems] The present invention provides a partition wall in a fuel tank, defines a small fuel storage chamber in the fuel tank by the partition wall, and a canister container is placed in the small fuel storage chamber. At the same time, a fuel adsorbing material is stored in this canister container, and during refueling, the refueled fuel is introduced into the small fuel storage chamber to cool the canister container, and when the engine is operating, high temperature return fuel is introduced into the small fuel storage chamber. The present invention is characterized in that by heating the canister container, the fuel adsorption/separation action of the fuel adsorbing material accommodated in the canister container is promoted.

[Function] According to the present invention, when refueling fuel is introduced into the small fuel storage chamber during refueling, the canister container is cooled by the injection of cold refueling fuel, increasing the adsorption capacity of fuel adsorbing substances and reducing the adsorption heat generated during refueling. In addition, when high-temperature return fuel is introduced into the small fuel storage chamber during engine operation, the canister container is heated by the high-temperature return fuel, which promotes the separation of the fuel adsorbed by the fuel-adsorbing material.

The present invention cools the canister container with cold refueling fuel and heats the canister container with high-temperature return fuel, so special cooling and heating devices are not required, the device is simple, and the canister container is heated with high temperature returned fuel. Since it is housed in the fuel tank, it does not require special space and can be made smaller.

Moreover, the large capacity fuel tank is divided into small fuel storage chambers by partition walls, and the canister container is housed in these small fuel storage chambers, so the heat capacity is small, and the canister container is connected to the cold refueling fuel and high temperature return fuel. The efficiency of heat transfer and reception is increased, and capacity can be improved.

[Example] The details of the present invention will be described below based on a first example shown in FIG.

Figure 1 is a sectional view showing the entire system, where ■ is the engine, 2 is the intake passage, 3 is the air cleaner, 4 is the throttle valve, and 5 is the air cleaner.
is the fuel injection valve.

Reference numeral 6 indicates a fuel tank that stores fuel to be supplied to the engine 1.

A sub-tank 7 corresponding to the partition wall of the present invention is provided within the fuel tank B, and a small fuel storage chamber 8 is defined within the fuel tank 6 by the sub-tank 7. Note that this small fuel storage chamber 8 also has the effect of minimizing fluctuations of the fuel in the fuel tank 6.

A fuel pump 9 is housed within the fuel tank 6, and in this embodiment, the fuel pump 9 is installed outside the sub-tank 7.

A canister C is accommodated in the small fuel storage chamber 7.

The canister C is configured by accommodating a fuel adsorbing material, such as activated carbon 11, in a canister container 10. To explain the structure of the canister C in more detail, the canister container 10 is formed by airtightly welding an upper plate 13 and a lower plate 14 to a donut-shaped container side wall 12. Inside this canister container 10, perforated plates 15 and 16 made of punched metal or the like are arranged vertically and oppositely.
are provided, and the space between these perforated plates 15 and 18 is filled with the fuel adsorbing material 11.

The upper perforated plate 15 is fixed to the upper plate 13 while securing an upper space 17 between it and the upper plate 13, and the lower perforated plate 16 secures a lower space 8 between it and the lower plate 14. It is pressed and biased by a spring 19.

The upper plate 13 includes a fuel supply pipe 20, a tank port 21, a refueling port 22, and an atmospheric port 23.
And the barge port 24 is fixed by means such as welding.

The fuel supply pipe 20 communicates with the small fuel storage chamber 7 through a central hole in the side wall 12 of the donut-shaped container.

The refueling port 22 and the barge port 24 communicate with the lower space 18 , the atmospheric port 23 communicates with the upper space 17 , and the tank port 21 communicates with the fuel adsorbent material 11 through a mesh filter 25 . It's open. Note that the atmospheric port 23 is covered with a filter 26 .

The verge port 24 is connected to the intake passage 2 of the engine, particularly near the throttle valve 4, via a negative pressure conduit 27, and a check valve 28 is attached to this negative pressure conduit 27.

The canister C having such a configuration is fixed to the upper part of the fuel tank 6 with a bolt 51 via a gasket 50. With this fixation, canister C is fixed to sub tank 7.
The small fuel storage chamber 8 is housed within the fuel storage chamber 8 and is installed approximately in the center of the small fuel storage chamber 8.

The sub-tank 7 is fixed to the upper surface of the fuel tank 6 by welding or the like, and an opening 38 is provided between the sub-tank 7 and the fuel tank 6 to serve as a fuel overflow passage, and an opening 38 is provided in the center of the sub-tank 7. A small hole 39 is opened in the bottom wall.

An exclusion port 30 is provided on the top surface of the fuel tank 6 to remove vaporized gasoline generated within the fuel tank 6 at times other than when refueling.
A discharge port 31 for discharging vaporized gasoline generated in the fuel tank B during refueling is provided by means such as welding.

The exclusion port 30 is connected to the tank port 2 via a conduit 32.
1, and this conduit 32 is provided with a check valve 33. Therefore, vaporized gasoline generated in the fuel tank B at times other than when refueling is guided into the fuel adsorbent material 11 through the conduit 32 and the check valve 33 and the mesh filter 25.

The discharge port 31 is connected to the refueling port 22 via another conduit 34, and this conduit 34 is provided with an on-off valve 35. The on-off valve 35 is
When the refueling nozzle 36 is inserted into the fuel refueling pipe 20, it opens automatically in response to this, and therefore, the vaporized gasoline generated in the fuel tank B during refueling is transferred to the conduit 34.
and the refueling boat 2 through the on-off valve 35.
2 to the lower space 18.

The fuel pump 9 installed in the fuel tank B is of an electric type, and when connected to a power source, pumps up the fuel in the fuel pump 9 through a strainer 40 and pressure-feeds it to the fuel injection valve 5 through a fuel pipe 41.

A return pipe 42 is connected to the fuel pipe 41, and the return pipe 42 is equipped with a constant pressure valve 43. This constant pressure valve 4
Reference numeral 3 is for keeping constant the pressure of the fuel pumped from the fuel pump 9 to the fuel injection valve 5 through the fuel pipe 41, and surplus fuel due to constant pressure control is sent to the fuel tank 6 through the return pipe 42. will be returned to. In this case, in this embodiment, a return port 44 is formed in the fuel supply pipe 20, and the return pipe 42 is connected to this return port 44. Therefore, the returned fuel is supplied to the fuel supply pipe 20.
will be returned to.

Next, the operation of the evaporated fuel processing apparatus of the first embodiment having the above configuration will be explained.

When parking, etc., vaporized gasoline generated in the fuel tank c is led from the discharge port 30 through the conduit 34, through the check valve 33, to the tank port 21, and diffused into the fuel adsorption material 11 such as activated carbon through the filter 25. be done. The fuel components of the diffused evaporated fuel are adsorbed by the fuel adsorption material 11, and only the fresh air from which the fuel has been removed flows into the upper space 17.
is discharged to the atmosphere port 23 and filter 2.
6 to the atmosphere.

Furthermore, when refueling, a refueling cap (not shown) of the fuel refilling pipe 20 is removed, and the refueling nozzle 36 is inserted into the fuel refilling pipe 20 to inject fuel.

The injected fuel passes through the central passage of the canister container 10 through the fuel supply pipe 20 to the canister C and the sub tank 7.
The fuel is supplied to a small fuel storage chamber 8 formed between the fuel and the fuel. Therefore, the oil level rises in the small fuel storage chamber 8 of the sub-tank 7, and when this oil level exceeds the opening 28, the supplied fuel overflows and is injected into the fuel tank 6 through the opening 38.

Note that the small hole 39 formed at the bottom of the sub-tank 7 is sufficiently small, so when filling gasoline, the small hole 39 is inserted into the tank 6.
The amount of gasoline flowing inside is small.

The evaporated gasoline generated during the fuel injection and the evaporated gasoline in the fuel tank 6 are led from the discharge port 31 to the refueling port 22 through the conduit 34.

That is, when the refueling nozzle 3B is inserted into the fuel refueling pipe 20, the on-off valve 35 is automatically opened and the discharge port 31 and the refueling port 22 are communicated through the conduit 34, so that the evaporated gasoline in the fuel tank 6 is From the refueling port 22, it is fed into the lower space 18 of the canister container 10, where it is diffused.

The evaporated fuel diffused in the lower space 18 becomes the fuel adsorbent 11
Only fresh air from which fuel has been removed is discharged into the upper space 17, from where it is discharged to the atmosphere through the atmospheric port 28 and the filter 26.

When HC and the like are adsorbed by the fuel adsorbent material 11, heat is generated, and the greater the amount of heat generated at this time, the lower the adsorption capacity is. - In the case of the above embodiment, when fuel is injected, cold injected fuel is supplied through the fuel supply pipe 20 to the small fuel storage chamber 8 configured between the canister C and the sub-tank 7 through the central passage of the canister container IO. , small fuel storage chamber 8
The fuel temperature of canister C is kept low, thus suppressing the temperature rise of canister C. In other words, since cold fuel passes around the fuel adsorption material 11 and fuel with a relatively large heat capacity remains, heat exchange with the fuel is promoted even if the temperature of the fuel adsorption material 11 attempts to rise. .

Therefore, the temperature of the fuel adsorbing material 11 is prevented from rising, and the ability to adsorb fuel components can be improved.

In addition, when adsorbing the evaporated fuel that evaporates while the vehicle is parked, etc., since the canister C is housed in the small fuel storage chamber 8, the temperature of the fuel adsorbing material 11 is prevented from rising because fuel is present around the canister C. , the fuel adsorption capacity is improved compared to conventional canisters.

On the other hand, when the engine is operating, including when the vehicle is running, the fuel components adsorbed by the fuel adsorbing material 11 are desorbed, and the fuel adsorbing material 11 is regenerated.

That is, when the engine 1 is operating, the intake passage 2 becomes a negative pressure, and this negative pressure is transferred to the purge port 2 through the negative pressure conduit 27.
4. The barge port 24 is the canister container 10
Since the lower space 18 is in communication with the lower space 18, this lower space 18 becomes a negative pressure. For this purpose, the external atmosphere is sucked in from the atmosphere port 23, and this air is sucked from the upper space 17 through the fuel adsorption material 11 toward the lower space 18.

Therefore, the fuel components adsorbed on the fuel adsorbing material 11 are removed by air, and this air is sucked into the intake passage 2 of the engine via the negative pressure conduit 27. Therefore, the fuel adsorbent material 11 is regenerated and regains the ability to adsorb fuel components.

On the other hand, when the engine 1 is operating like this, the fuel pump 9
is also connected to a power source and operates to pump up fuel in the fuel tank B and forcefully send it to the fuel injection valve 5 through the fuel pipe 41. The fuel injection valve 5 injects a portion of the fuel supplied from the fuel pump 9 into the intake passage 2 or the combustion chamber. With this fuel injection valve 5.

The remaining fuel that has not been injected, that is, the fuel that has become surplus by being controlled by the constant pressure valve 43, is sent from the return pipe 42 to the fuel supply pipe 2o through the return port 44. This surplus returned fuel has passed around the combustion chamber of the engine, so its temperature is high, and therefore the fuel is supplied to the small fuel storage chamber 8 through the central passage of the canister container 10 through the fuel supply pipe 2o. is relatively high temperature. As a result, the canister C is warmed and the temperature of the fuel adsorbing substance 11 is increased, so that the adsorbed fuel components are promoted to be removed, and regeneration and purification are performed quickly.

In this case, since the canister C is surrounded by the sub-tank 7 as a small fuel storage chamber 8, even when the amount of returned fuel that has passed through the engine and is warmed is small, the capacity of the small fuel storage chamber 8 is small. Due to the small size, a sudden temperature drop does not occur, and the canister C can be effectively heated.

Further, in this embodiment, high temperature return fuel is supplied to the fuel supply pipe 20.
The sub tank 7 is connected through a return port 44 formed in a part of the
Since the fuel supply pipe 20 is introduced inside, the fuel supply pipe 20 can be used effectively.
This has the effect of significantly simplifying the piping system. In this case, since the engine is stopped during refueling, the low-temperature injected gasoline and the high-temperature return fuel do not pass through the fuel supply pipe 20 at the same time, so the high-temperature return fuel is routed into the fuel supply pipe 20. There is no harm caused by allowing the inflow.

Note that when the remaining amount of fuel in the fuel tank 6 becomes low, the fuel in the small fuel storage chamber 8 flows into the fuel tank 1 through the small hole 39 opened on the bottom surface of the sub-tank 7, so that fuel can be consumed effectively. can do.

FIG. 2 is a sectional view of a sub-tank showing a second embodiment of the present invention.

In this second embodiment, a float valve 65 surrounded by a holder 60 having openings 61 and 62 is provided in place of the small hole 39 at the bottom of the subtan foot in the first embodiment.

In this second embodiment, when fuel is injected, the pressure of the injected fuel forces the float valve 65 downward through the opening 61 and moves it to close the opening 64 in the lower wall of the sub-tank 7, thereby causing the inside of the fuel tank 6 and the sub-tank 7 to Cut off the flow of fuel between the inside and outside.

Except when fuel is being injected, the float valve 65 moves upward due to the buoyancy of the float valve 65, so the opening 64 in the lower wall of the sub-tank 7 is opened, and the inside of the fuel tank B and the sub-tank 7 are
Allows fuel flow between the inside and outside.

In this second embodiment, since low-temperature fuel does not leak out from the small holes 39 during fuel injection, the canister C can be cooled more effectively during fuel injection.

FIG. 3 is a sectional view of the sub-tank 7 used in the third embodiment of the present invention.

As shown in Fig. 3, there are a plurality of small holes 71 around the sub-tank 7.
Even if... is provided, effects such as road spacing can be obtained with a simple configuration.

4 and 5 show a fourth embodiment of the invention.

In this embodiment, members having the same functions as those in the first embodiment are given the same numbers and their explanations will be omitted.

This fourth embodiment is characterized in that a fuel pump 9 is housed in a canister C. The fuel pump 9 is housed in a central hole of a canister container IO, and is mounted in a holder 101 shown in FIG. It is held at the center of the central hole of the canister container 10, and is fixed to the lower surface of the canister container 1o by a bracket 102 via a bolt 103. The discharge port 9a of the fuel pump 9 is fluid-tightly connected to a pressure port 104 formed in the fuel supply pipe 2o by a sealing member such as an O-ring 105.

Sub-tank 7 as a partition wall forming a small fuel storage chamber 8
This bottom wall is also used as the bottom wall of the fuel tank 6, and the inside of these sub-tanks 7 and the inside of the fuel tank 6 are electrically connected through a small hole 39 opened at the side.

The strainer 4o of the fuel pump 9 is installed on the common bottom wall of the sub-tank 7 and the fuel tank 6.

In the fourth embodiment having such a configuration, when refueling, the cap 10B is removed and fuel is injected from a refueling nozzle (not shown) inserted into the fuel refueling pipe 20, so that this cold injected fuel is transferred to the canister C. It cools the fuel adsorbing material 11 and prevents the temperature rise of the fuel adsorbing material 11 to maintain a high adsorption capacity, and when the engine is operated, including when the vehicle is running, the fuel components adsorbed on the fuel adsorbing material 11 are transferred to the intake passage 2 of the engine. At the same time, a part of the fuel pumped from the fuel pump 9 is returned at a high temperature, and this returned fuel warms the canister C to promote the separation of the fuel components adsorbed by the fuel adsorbent material 11. The effect of rapid regeneration and purification is similar to that of the first embodiment.

In the case of this embodiment, since the fuel pump 9 is housed in the central hole of the canister container lO in the canister C, the operating noise generated when the fuel pump 9 is operated is prevented from being emitted to the outside. That is, recent engines tend to have higher outputs, and therefore the fuel pump 9 is required to have a larger flow rate, resulting in increased operating noise. However, when the fuel pump 9 is surrounded by the canister C as in this embodiment, the canister container 10 and the fuel adsorbent material 11 made of activated carbon or the like act as a shielding wall and a sound absorber, thereby absorbing most of the operating noise of the fuel pump 9. can be absorbed and thus reduce noise.

Further, since the fuel pump 9 is fixed in the central hole of the canister container IO via the holder 101 and the bracket 102, the fuel pump 9 and the canister C are assembled together before being housed in the fuel tank 6. If the fuel pump 9 and the canister C are attached, the fuel pump 9 and the canister C can be assembled together, and the assembly work becomes easier than when the fuel pump 9 and the canister C are installed separately.

Furthermore, in this embodiment, the bottom wall of the sub-tank 7 and the bottom wall of the fuel tank 6 are shared, and the strainer 40 of the fuel pump 9 is installed on this common bottom wall. Even if the amount is small, it can be effectively pumped up by the fuel pump 9, and there is no need to worry about fuel remaining.

FIG. 6 shows a fifth embodiment of the invention.

In the case of the first to fourth embodiments, the fuel supply pipe 20
The donut-shaped canister container 10 in canister C
In the fifth embodiment, the fuel supply pipe 120 is formed on one side of the fuel tank 6, and therefore the partition wall 121 separates the fuel tank from the fuel tank 6. A small fuel storage chamber 8 is constructed on one side of the fuel tank 6.

Then, the canister C is accommodated in this small fuel storage chamber 8,
A fuel pump 9 is housed in the center of this canister C.

Even in this case, the canister C can be cooled with the cold fuel injected from the fuel supply pipe 120, and the noise emitted from the fuel pump 9 can be blocked by the canister C.

Note that the discharge hole 9a of the fuel pump 9 and the pressure feeding boat 104 can also be connected using a fuel hose 122, and 123 indicates a hose band.

Further, the fuel pump 9 is supported by a pump holder 126 formed on the cover plate 125.

7 and 8 show a sixth embodiment of the invention.

In this sixth embodiment, a housing section for a canister C and a strainer housing section for a fuel pump 9 are partitioned.

In other words, is subtank 7 a horizontal compartment? 151 in the vertical direction, a canister C is housed in a small fuel storage chamber 8 formed at the top, and a fuel pump 9 is housed in the center of this canister C. The strainer 152 of the fuel pump 9 is installed in a fuel pumping chamber 153 formed at the bottom.

The small fuel storage chamber 8 divided by the horizontal partition wall 151 and the fuel pumping chamber 153 are communicated with each other through a communication pipe 154 and a float valve 155. Fuel pumping room 1
53 communicates with the inside of the fuel tank G through a small hole 39.

When the small fuel storage chamber 8 is filled with fuel supplied from the fuel supply pipe 20 during fuel refueling, the fuel overflows from the opening 38 and flows into the fuel tank 6. Fuel pumping room 15
3 is supplied with fuel from the small fuel storage chamber 8 through the communication vibrator 154, and from the fuel tank 6 through the small hole 39.
Fuel flows through.

The float valve 155 is set to close due to buoyancy when the fuel pumping chamber 153 is filled with fuel, and is opened when the fuel in the fuel pumping chamber 153 decreases.

The structure of the strainer 152 is shown in detail in FIG. 8, and the strainer 152 of this embodiment is connected to the fuel pump 9.
, an elastic holding part 201 that holds the suction port 9b between the fuel pump 9 and the horizontal partition wall 151, an elastic pressing part 202 that presses between the fuel pump 9 and the horizontal partition wall 151 with a predetermined pressure, and a mesh filter 203. The outer diameter of the strainer 152 is smaller than the inner diameter of the canister C, and the strainer 152 is attached at the same time as the fuel pump 9 is attached to the canister C, and is housed in the small fuel storage chamber 8 integrally therewith.

In the case of the sixth embodiment having such a configuration, when the fuel pump 9 is activated due to engine operation, the fuel pump 9 pumps up fuel from the fuel pumping chamber 153 through the strainer 152.

When the heated fuel passes through the engine and is returned through the return port 44, this fuel flows into the small fuel storage chamber 8 from the fuel supply pipe 20 and warms the canister C.

This promotes the regeneration of the fuel adsorbent material (1) in the canister C.

When the fuel in the fuel pumping chamber 153 is consumed by the operation of the fuel pump 9, fuel is supplied to the fuel pumping chamber 153 from the small fuel storage chamber 8 through the communication pipe 154, and also from the fuel tank 6 through the small hole 39. Fuel flows in.

In the small fuel storage chamber 8, the liquid level drops as the fuel is consumed, and when it falls to the level a, the fuel no longer overflows from the opening 38, but the communication vibe 154
Fuel is supplied to the fuel pumping chamber 153 through the fuel pumping chamber 153. However, when the liquid level falls to the level b, the fuel in the small fuel storage chamber 8 is also transferred to the fuel pumping chamber 15 through the communication pipe 154.
3, and therefore the liquid level remains at level b.

As a result, the fuel in the small fuel storage chamber 8 is maintained at the liquid level, so that the canister C is immersed in the fuel and heating by the returned fuel is favorably promoted.

When the amount of fuel in the fuel tank 6 decreases due to fuel consumption and the oil level in the fuel pumping chamber 153 also drops, the float valve 155 opens and the oil level reaches level b.
The fuel stored until then flows into the fuel pumping chamber 153 from the float valve 155. Since the fuel that has flowed in this way is pumped up from the strainer 152 of the fuel pump 9, almost no fuel remains in the fuel tank 6 (effective utilization is possible).

FIG. 9 shows another embodiment of the strainer.

That is, the strainer 300 has a small fuel storage chamber 8 at the top.
A mesh filter 301 that allows fuel to pass through, a mesh filter 302 that allows fuel to pass through the fuel pumping chamber 153, a diaphragm 303 that internally partitions these upper and lower chambers, and an on-off valve port 304 attached to this diaphragm 303. It is composed of

When the fuel pump 9 is inactive, the on-off valve boat 3
04 is at the position d shown by the solid line, and when the fuel pump 9 is operating, the opening/closing valve port 304 is pulled up to the position shown by the imaginary line e by the suction force. Therefore, communication between the mesh filter 301 communicating with the small fuel storage chamber 8 and the suction port 9b of the fuel pump 9 is cut off, and the suction port 9b of the fuel pump 9 communicates with the fuel pumping chamber 153 through the mesh filter 302. Therefore, the fuel in the fuel pumping chamber 153 is sucked.

When the pressure in the fuel pumping chamber 153 decreases as the fuel in the fuel tank BO is consumed, the pressure in the small fuel storage chamber 8 becomes relatively large, and therefore the on-off valve port 30
4 moves to the position d shown by the solid line. As a result, the fuel pump 9
The fuel in the small fuel storage chamber 8 will be pumped up.

If such a strainer 300 is used, there is no need to use the float valve 155 shown in FIG. 7.

[Effects of the Invention] As detailed above, according to the present invention, by introducing the refueling fuel into the small fuel storage chamber during refueling, the canister is cooled with cold fuel, and the adsorption capacity for fuel adsorbing substances is increased, and the The adsorption heat generated is suppressed, and during engine operation, high-temperature return fuel is introduced into the small fuel storage chamber, which heats the canister container and promotes the separation of the fuel adsorbed by the fuel adsorbent.

Therefore, no special cooling and heating equipment is required;
In addition to simplifying the device, since the canister container is housed in the fuel tank, no special space is required and the device can be made smaller. Moreover, the large capacity fuel tank is divided into small fuel storage chambers by partition walls, and the canister container is housed in these small fuel storage chambers, so the heat capacity is small, and the canister container is connected to the cold refueling fuel and high temperature return fuel. The efficiency of heat transfer and reception is increased, and capacity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the entire system of the first embodiment of the present invention, FIG. 2 is a sectional view of a sub-tank used in the second embodiment, and FIG. 3 is a sectional view of a sub-tank used in the third embodiment. FIG. 4 is a sectional view showing the entire system of the fourth embodiment, FIG. 5 is an explanatory diagram of the pump holder, FIG. 6 is a sectional view showing the entire system of the fifth embodiment, and FIG. 7 is the sixth embodiment. FIG. 8 is a cross-sectional view showing the structure of the strainer, and FIG. 9 is a cross-sectional view showing the structure of another strainer. ■...Diesel engine, 2...Intake passage, 3...
... Air cleaner, 4... Throttle valve, 5... Fuel injection valve, 6... Fuel tank, 7... Sub tank, 8...
- Small fuel storage chamber, 9...Fuel pump, C...Canister, IO...Canister container, 11...Fuel adsorption material, 20...Fuel supply pipe, 21...Tank port, 22 ... Refueling port, 23... Atmospheric port, 24... Verge port, 26... Filter, 27... Negative pressure conduit, 30... Exclusion port, 31...
...Discharge port, 32... Conduit, 33... Check valve, 34... Conduit, 35... Open/close valve, 36
... Refueling nozzle, 38... Opening, 39... Small hole, 40... Strainer, 41... Fuel pipe, 42...
... Return piping, 43 ... Constant pressure valve, 44 ... Return port, 101 ... Pump holder, 102 ... Bracket, 120 ... Fuel supply pipe, 121 ... Partition wall, 1
51...Horizontal partition wall, 152...Strainer, 15
3...Fuel pumping chamber, 154...Communication pipe, 1
55...Float valve, 300...Strainer. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 6 152 Strainer Figure 8 Figure 9

Claims (3)

[Claims] (1) A partition wall is provided in the fuel tank, and the partition wall defines a small fuel storage chamber in the fuel tank, and a canister container is accommodated in the small fuel storage chamber, and a fuel adsorbing substance is placed in the canister container. By introducing refueling fuel into the small fuel storage chamber to cool the canister container during refueling, and by introducing high temperature return fuel into the small fuel storage chamber to heat the canister container during engine operation, An evaporative fuel processing device characterized in that the fuel adsorption/desorption action of the fuel adsorbent contained in the canister is promoted. (2) The canister container accommodated in the small fuel storage chamber is donut-shaped, and a fuel pump is installed in the center of the donut-shaped canister container. Evaporated fuel processing equipment. (3) A fuel pumping chamber is formed in the fuel tank, which is separated from a small fuel storage chamber that accommodates the canister container and the fuel pump, and that accommodates the strainer of the fuel pump, and supplies fuel to the small fuel storage chamber. The fuel and high-temperature return fuel are introduced and a predetermined amount of fuel is retained, and when the fuel in the fuel pumping chamber decreases, the fuel in the small fuel storage chamber flows into the fuel pumping chamber. The evaporated fuel processing device according to scope 2.