JP2003193915A - Processing method and device for gasoline vapor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a canister compact by reducing the introduced quantity of gasoline vapor to the canister by enhancing absorption factor wherein the gasoline vapor in a fuel tank is brought into contact with liquid gasoline to be absorbed. <P>SOLUTION: While introducing liquid gasoline W1 in a fuel tank 1 into a gas-liquid contact tube 9, gasoline vapor W2 in the fuel tank 1 is introduced into the gas-liquid contact tube 9 by a booster pump 17. The liquid gasoline W1 and the gasoline vapor W2 introduced in the gas-liquid contact tube 9 are brought to contact together while pressurizing the inside of the gas-liquid contact tube 9. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for treating gasoline vapor.

[0002]

2. Description of the Related Art Conventionally, in order to prevent the gasoline vapor generated from a fuel tank mounted on a vehicle from being diffused into the atmosphere, for example, all the gasoline vapor generated during refueling is adsorbed by a canister, and then the canister is activated during engine operation. It is known that the adsorbed gasoline vapor is introduced into a gas-liquid contact cylinder, and is brought into contact with liquid gasoline in the gas-liquid contact cylinder to be absorbed by the liquid gasoline.

[0003]

As described above, since the properties of liquid gasoline with which gasoline vapor is brought into contact are the same as the properties of liquid gasoline in a fuel tank, simply bringing them into contact with each other results in the formation of gasoline vapor. Absorption rate to liquid gasoline is not sufficient. Therefore, there is a problem that the amount of gasoline vapor not absorbed by the liquid gasoline is increased into the canister, the canister becomes large, and the amount of gasoline vapor processed by the engine also increases.

In view of the above, the present invention relates to a method of contacting gasoline vapor generated from a fuel tank with liquid gasoline to absorb the gasoline vapor into the liquid gasoline. It is an object to provide a method and its device.

[0005]

In order to solve the above-mentioned problems, the first invention of claim 1 introduces the liquid gasoline in the fuel tank into the gas-liquid contact cylinder and the gasoline in the fuel tank. The vapor is introduced into the gas-liquid contact cylinder by a pressurizing pump, and the liquid gasoline introduced into the gas-liquid contact cylinder is brought into contact with gasoline vapor while the gas-liquid contact cylinder is pressurized. It is a method of processing gasoline vapor that does.

According to a second aspect of the present invention, the liquid gasoline in the fuel tank and the gasoline vapor in the fuel tank are introduced into the gas-liquid contact cylinder to bring them into contact with each other in the gas-liquid contact cylinder. A method for treating gasoline vapor, characterized in that the ratio of the volume of the liquid gasoline to be brought into contact with the volume of gasoline vapor is 1/200 or more, and the temperature in the gas-liquid contact cylinder is set to less than 20 ° C. Is.

According to a third aspect of the present invention, the liquid gasoline in the fuel tank is introduced into the gas-liquid contact cylinder, and the gasoline vapor in the fuel tank is introduced into the gas-liquid contact cylinder by a pressure pump. These are contacted in the gas-liquid contact cylinder, and when the temperature in the gas-liquid contact cylinder is less than 26.7 ° C., the ratio of the volume of the liquid gasoline and the volume of the gasoline vapor to be contacted is 1/200. In addition, the method for treating gasoline vapor is characterized in that the pressure in the gas-liquid contact cylinder is set to 0.5 atm or more.

A fourth aspect of the present invention is an apparatus used in the method according to the first and third aspects of the invention, wherein a gas-liquid contact cylinder for introducing liquid gasoline in the fuel tank, and an inside of the fuel tank are provided. And a pressure pump that pressurizes and introduces the gasoline vapor into the gas-liquid contact cylinder, and pressurizes the inside of the gas-liquid contact cylinder to bring the introduced liquid gasoline into contact with the gasoline vapor. It is a characteristic gasoline vapor processing device.

A fifth aspect of the present invention is an apparatus used in the method of the second aspect of the invention, wherein liquid gasoline in the fuel tank and gasoline vapor in the fuel tank are introduced and brought into contact with each other. A gasoline vapor treatment apparatus comprising a gas-liquid contact cylinder and a cooler for cooling the gas-liquid contact cylinder.

According to a sixth aspect of the present invention, a gas-liquid contact cylinder for introducing liquid gasoline in a fuel tank and a pressurization for pressurizing and introducing gasoline vapor in the fuel tank into the gas-liquid contact cylinder. A gasoline vapor processing apparatus comprising a pump and a cooler for cooling the inside of the gas-liquid contact cylinder.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described based on examples shown in the drawings.

FIG. 1 is a system diagram of a gasoline vapor processing apparatus according to the present invention. In FIG. 1, a fuel tank 1 is mounted on a vehicle and liquid gasoline W1 is stored therein.
A fuel cylinder 2 is provided in the fuel tank 1, and an electric fuel pump 3 that operates during engine operation is disposed in the fuel tank 1.

The electric fuel pump 3 supplies the liquid gasoline W1 in the fuel tank 1 to the engine side passage 7 through the fuel supply passage 4, the first pressure regulator 5 and the second pressure regulator 6. The second pressure regulator 6 supplies the excess liquid gasoline W1 not supplied to the engine side passage 7 to the liquid gasoline supply passage 8 among the liquid gasoline W1 supplied by the electric fuel pump 3 during engine operation. There is. The other end of the liquid gasoline supply passage 8 is open to the inside of the gas-liquid contact cylinder 9. In the embodiment, the gas-liquid contact cylinder 9 uses a bubble cylinder in which a predetermined amount of liquid is retained and a gas is introduced into the liquid to bring the gas and the liquid into contact with each other. In the present embodiment, the gas-liquid contact cylinder 9 will be described below.

A first return passage 10 is opened and communicated with an upper portion of a side surface of the gas-liquid contact cylinder 9, and the first return passage 10 is connected to the first return passage 10.
The other end of the is lowered and opened to the fuel tank 1. At the position of the opening 10a of the first return passage 10 to the gas-liquid contact cylinder 9, a predetermined amount of liquid was retained in the gas-liquid contact cylinder 9, and more liquid was introduced into the gas-liquid contact cylinder 9. In this case, it is set to flow out from the first return passage 10. Further, the first chamber is formed so that a gas chamber 9a having a predetermined volume is formed above the surface of the liquid retained by the predetermined amount.
The position of the opening 10a of the return passage 10 is set. The liquid retention amount (volume) in the gas-liquid contact cylinder 9 is the amount (volume) of gasoline vapor that is contact-treated in the gas-liquid contact cylinder 9.
Is set to be about 1/200 (volume).

A throttle 11 is provided in the first return passage 10.

On the upper wall 1a of the fuel tank 1, there are provided a fuel cut-off valve 12 and a full tank control valve 13 which is closed when the tank is full when refueling. A first evaporation passage 14 is connected to the fuel cutoff valve 12 and the full tank regulating valve 13,
The other end of the evaporation passage 14 is opened near the bottom in the gas-liquid contact cylinder 9, and the gasoline vapor W2 in the fuel tank 1 flowing out from the fuel cutoff valve 12 and the full tank control valve 13 is the first evaporation passage. The gas is introduced into the vicinity of the bottom of the gas-liquid contact cylinder 9 through 14, that is, the bottom of the liquid layer retained in the gas-liquid contact cylinder 9.

The full tank control valve 13 is provided with a flow detector 15 (flow rate sensor, pressure sensor, etc.) for detecting whether or not the gasoline vapor W2 in the fuel tank 1 has passed through the full tank control valve 13. Therefore, the ECU 16 determines whether or not the vehicle is passing.

A pressure pump 17 is provided in the first evaporation passage 14, and the pressure pump 17 allows the gasoline vapor W2 in the fuel tank 1 to flow through the first evaporation passage 14.
It is configured to be pressure-fed into the gas-liquid contact cylinder 9 through.
The pressure pump 17 is driven by a drive circuit arranged in the ECU 16.

A second evaporation passage 18 is opened and communicated with the gas chamber 9a of the gas-liquid contact cylinder 9, and the other end of the second evaporation passage 18 is communicated with a tank port 20 of a canister 19. A diaphragm 21 is provided in the second evaporation passage 18. The throttle 21 and the throttle 11 maintain the pressure in the gas-liquid contact cylinder 9 at a set value. The canister 19 is a well-known canister in which an adsorbent such as activated carbon is filled, the atmospheric port 22 is opened at one end, and the gasoline vapor from the tank port 20 is introduced to collect the adsorbent while the engine is stopped. During operation of the engine, the gasoline vapor adsorbed and collected by the negative pressure of the intake pipe is discharged from the purge port 23 to the intake pipe of the engine.

In FIG. 1, 24 is a canister closed valve (CCV) and 25 is a second return passage.

Further, a filler cap detector 27 for detecting whether or not the filler cap 26 installed at the filler port is opened is provided in the refueling cylinder portion 2, and a signal from the filler cap detector 27 is sent to the filler cap detector 27. It is sent to the ECU 16 to determine the open / closed state of the filler cap 26.

Next, the operation of the above embodiment will be described.

Electric fuel pump 3 during engine operation
Is activated, the liquid gasoline W1 in the fuel tank 1 becomes
It is supplied to the engine (not shown) from the engine side passage 7 through the first pressure regulator 5. At this time,
Excess fluid (gasoline W1) not supplied to the engine side passage 7 is introduced into the gas-liquid contact cylinder 9 from the second pressure regulator 6 through the liquid gasoline supply passage 8.

When the liquid gasoline W1 introduced into the gas-liquid contact cylinder 9 accumulates in the gas-liquid contact cylinder 9 and its oil level reaches the position of the opening 10a of the first return passage 10, that is, when a predetermined amount is accumulated. , More introduced liquid gasoline W1
Flow out from the opening 10a to the first return passage 10 so as to be replaced, and are returned to the inside of the fuel tank 1 through the throttle 11.

As described above, the method for storing a predetermined amount of liquid gasoline W1 in the gas-liquid contact cylinder 9 is as follows, when the liquid gasoline W1 is introduced and the vehicle is stopped and refueled while the vehicle is operating. The liquid gasoline W1 is stored in the gas-liquid contact cylinder 9 by a predetermined amount, or the electric fuel pump 3 is driven at the time of refueling so that the liquid gasoline W1
Liquid gasoline W1 in the gas-liquid contact cylinder 9
It is also possible to replace the liquid gasoline W1 while holding a predetermined amount.

As described above, FIG. 2 shows the operation of introducing the gasoline vapor W2 in the fuel tank 1 into the gas-liquid contact cylinder 9 when the liquid gasoline W1 is retained in the gas-liquid contact cylinder 9 by a predetermined amount. This will be described with reference to the flowchart shown.

When the filler cap 26 is opened during refueling,
An open signal is sent from the filler cap detector 27 to the ECU 16, and it is determined that the filler cap 26 is open (step 101). After the filler cap 26 is opened, it is determined whether or not the gasoline vapor has passed through the first evaporation passage 14 by the flow detector 15 attached to the full tank control valve 13 (step 102), and the gas is flowing. If it is determined that the ECU 16 receives the signal, the ECU 16 starts the operation of the pressurizing pump 17 (step 103).

By driving the pressurizing pump 17, the gasoline vapor W2 in the fuel tank 1 stays in the bottom of the gas-liquid contacting cylinder 9, that is, in the gas-liquid contacting cylinder 9 through the evaporation passage 14 and the pressurizing pump 17. It is pumped to the bottom of the liquid gasoline W1 layer and contacts the liquid gasoline W1. Further, the pressure pump 17 pumps gasoline vapor and the presence of the throttles 11 and 21 pressurizes the inside of the gas-liquid contact cylinder 9 to a predetermined pressure. The predetermined pressure is, for example, in the range of 0 to 2 atm or 2
The pressure may be at least atm.

As described above, when the gasoline vapor W2 comes into contact with the liquid gasoline W1, a part of the fuel component in the gasoline vapor W2 is liquefied and absorbed in the liquid gasoline W1.

Then, the unabsorbed gasoline vapor floats into the gas chamber 9a, passes through the second evaporation passage 18, and passes from the tank port 20 of the canister 19 to the canister 19.
It enters inside and is adsorbed and collected by the adsorbent.

When the liquid gasoline W1 in the gas-liquid contact cylinder 9 has increased beyond a predetermined amount, it flows out into the first return passage 10 and is returned into the fuel tank 1 through the throttle 11.

When the refueling is completed and the gasoline vapor in the fuel tank 1 stops flowing into the first evaporation passage 14, the flow detector 15 judges that the gasoline vapor has not passed (step 104), and the signal is sent to the ECU 16. Sent out, E
The pressurizing pump 17 is stopped by the CU 16 (step 105).

Next, the results of a simulation experiment on the liquefaction absorption rate of gasoline vapor generated during refueling of the fuel tank 1 will be described. In the following, liter is represented by L.

As the refueling condition (ORVR test condition specified by EPA), the temperature of the liquid gasoline remaining in the tank is set to 2
The temperature was 6.7 ° C, the refueling gasoline temperature was 19.4 ° C, and the gasoline refueling rate was 37.9 L / min.

(Experiment 1) Conditions (1) Temperature inside gas-liquid contact cylinder: 26.7 ° C. (2) Pressure inside gas-liquid contact cylinder: 0 to 2 atm (3) Volume of gasoline vapor flowing into gas-liquid contact cylinder : 100
L (4) Liquid gasoline volume in gas-liquid contact cylinder: 0 to 2 L (5) Gasoline vapor concentration: 34.6 mo1% (equivalent to refueling) In this experiment 1, liquid in gas-liquid contact cylinder for 100 L of gasoline vapor FIG. 3 shows the absorption rate of gasoline vapor when the amount of gasoline is 0 to 2 L.

From FIG. 3, the pressure in the gas-liquid contact cylinder is 2a.
In the case of tm, the absorption rate for liquid gasoline of 0 to 2 L shows the value of characteristic A-1, and the absorption rate of liquid gasoline is 2
In the case of L, the absorption rate was about 64 wt%. As a result, about 36% of the remaining unabsorbed canister 19
As a result, the canister 19 can be downsized and the canister 19 can be downsized and the amount of gasoline vapor processed by the engine can be reduced.

The pressure inside the gas-liquid contact cylinder is 1.5 atm.
In the above case, the absorption rate for liquid gasoline of 0 to 2 L showed the value of characteristic B-1, and when the liquid gasoline was 2 L, the absorption rate showed a value of about 55 wt%.

Hereinafter, the pressure in the gas-liquid contact cylinder is 1 atm,
In the cases of 0.5 atm, 0.3 atm, and 0 atm, the values of characteristics C-1, D-1, and E-1 are shown, respectively. Note that 0a
Not shown for tm.

From this result, the gasoline vapor generated during refueling is pressurized by the pressure pump to increase the pressure in the gas-liquid contact cylinder, and the gasoline vapor is brought into contact with the liquid gasoline under this pressure, whereby It is clear that the absorption rate of fuel components into liquid gasoline is high.

Further, the inflection point of each characteristic is such that the treated gasoline vapor is 100 L and the liquid gasoline in the gas-liquid contact cylinder is 0.5 L, that is, the amount (volume) of the treated gasoline vapor is Volume (volume) of liquid gasoline in the liquid contact cylinder
Is at a value of 1/200. Therefore, it is clear that the absorption rate is good when the value is set above this value.

Further, under the above conditions, it is clear that the absorbing effect can be expected when the pressure of the pressure pump, that is, the pressure in the gas-liquid contact cylinder 9 is 0.5 atm or more.

(Experiment 2) Condition (1) Temperature in gas-liquid contact cylinder: 20 ° C. Other conditions are the same as the conditions (2) to (5) of Experiment 1 above.

In Experiment 2, 100 parts of gasoline vapor was used.
FIG. 4 shows the absorption rate of gasoline vapor when the amount of liquid gasoline in the gas-liquid contact cylinder for L is 0 to 2 L.

From FIG. 4, the pressure in the gas-liquid contact cylinder is 2a.
In the case of tm, the absorption rate for liquid gasoline of 0 to 2 L shows the value of characteristic A-2, and the absorption rate of liquid gasoline is 2
In the case of L, the absorption rate was about 70 wt%.

Below, the pressure inside the gas-liquid contact cylinder is 1.5 at.
m, 1 atm, 0.5 atm, 0.3 atm, 0 atm
In the case of, the characteristics B-2, C-2, D-2, E-2,
The value of F-2 was shown.

From this result, the temperature in the gas-liquid contact cylinder is 20
In the case of ℃, when the pressure of the pressurizing pump, that is, the pressure in the gas-liquid contact cylinder 9 is 0.3 atm or more, the absorption effect is exhibited, and similar to Experiment 1, a good absorption effect is expected at 0.5 atm or more. It is clear that you can.

(Experiment 3) Condition (1) Temperature in gas-liquid contact cylinder: 0 ° C. Other conditions are the same as the conditions (2) to (5) of Experiment 1 above.

In this experiment 3, 100 parts of gasoline vapor was used.
FIG. 5 shows the absorptance of gasoline vapor when the amount of liquid gasoline in the gas-liquid contact cylinder for L is 0 to 2 L.

From FIG. 5, the pressure inside the gas-liquid contact cylinder is 2a.
tm, 1.5 atm, 1 atm, 0.5 atm, 0.3
In the case of atm and 0 atm, characteristics A-3, B-3, and
The values of C-3, D-3, E-3 and F-3 are shown.

From these results, the temperature inside the gas-liquid contact cylinder was 0 ° C.
In this case, it is clear that the absorption effect can be expected even when the pressure in the gas-liquid contact cylinder is 0 atm, that is, even when the pressure is not applied.

Therefore, as shown in FIG. 1, in the case where the pressurizing pump 17 is provided, it is effective when the temperature in the gas-liquid contact cylinder 9 is 20 ° C. or higher.

From the above, when the temperature inside the gas-liquid contact cylinder 9 is set to less than 20 ° C., it is not necessary to pressurize the inside of the gas-liquid contact cylinder 9 as described above. Therefore, in the second embodiment shown in FIG. A temperature sensor 30 and a cooler 31 are provided on the gas-liquid contact cylinder 9, and the pressurizing pump 17 and the throttle 1 of the first embodiment shown in FIG.
The configuration is such that neither 1 or 21 is provided.

Since the other structure is the same as that of the first embodiment, the same reference numerals are given to the same portions and the description thereof will be omitted.

The operation of the second embodiment will be described with reference to the flow chart shown in FIG.

When the filler cap 26 is opened in a state where a predetermined amount of liquid gasoline W1 is retained in the gas-liquid contact cylinder 9 as in the above embodiment, the filler cap detector 2 is opened.
An open signal is sent from 7 to the ECU 16, and it is determined that the filler cap 26 is open (step 201).
Next, when refueling is performed after the filler cap 26 is opened, the gasoline vapor in the fuel tank 1 increases in vapor pressure due to the increase in the liquid gasoline W1 due to refueling, and the vapor pressure increases through the first evaporation passage 14. 9 is introduced into the gas-liquid contact cylinder 9, and the gasoline vapor W2 comes into contact with the liquid gasoline W1 in the gas-liquid contact cylinder 9. At this time, the full tank control valve 1
It is judged by the flow detector 15 attached to 3 that the gasoline vapor is passing through the first evaporation passage 14 (step 202), and the signal is transmitted to the ECU 16. Upon receiving this signal, the temperature sensor 30 and the ECU 16
It is judged whether the temperature in the gas-liquid contact cylinder 9 is within a set range, that is, less than 20 ° C. (step 203), and if it is 20 ° C. or higher, the ECU 16 drives the cooler 31 and the inside of the gas-liquid contact cylinder 9 is judged. Lower the temperature below 20 ° C (step 20
4).

Thus, the temperature inside the gas-liquid contact cylinder 9 is 20
By keeping the temperature below 0 ° C., as shown in FIG. 5, the absorption rate of gasoline vapor can be increased without pressurizing the inside of the gas-liquid contact cylinder 9.

When refueling is completed, the flow detector 1
5, it is determined that the gasoline vapor has not passed through the first evaporation passage 14 (step 205), and the ECU 16 stops the cooler 31 (step 206).

From the above, the amount (volume) of liquid gasoline staying in the gas-liquid contact cylinder 9 is 0.5 L or more, that is, 1/200 of 100 L of gasoline vapor to be processed.
As described above, by controlling the temperature in the gas-liquid contact cylinder 9 to be less than 20 ° C. at the time of refueling by the cooler 31, the absorption effect can be exhibited without pressurizing the gas-liquid contact cylinder 9.

Next, a third embodiment shown in FIG. 8 will be described.

The third embodiment has a structure in which the pressurizing structure of the first embodiment shown in FIG. 1 and the cooling structure of the second embodiment are used together.

Since each member in the third embodiment is the same as the member in the first embodiment and the member in the second embodiment,
The same symbols are given to the respective members and the description of the structure thereof is omitted.

The operation of the third embodiment will be described with reference to the flow chart shown in FIG.

When the filler cap 26 is opened at the time of refueling with the liquid gasoline W1 retained in the gas-liquid contact cylinder 9 by a predetermined amount as described above, the filler cap detector 2
An open signal is sent from 7 to the ECU 16 and it is determined that the filler cap 26 is open (step 301).
After the filler cap 26 is opened, the flow detector 15 attached to the full tank control valve 13 determines whether or not the gasoline vapor W2 is passing through the first evaporation passage 14 (step 302), and the flow is passed. If it is determined that the ECU 16 receives the signal, the ECU 16 receives the signal, and the ECU 16 receives the signal.
Starts the operation of the pressurizing pump 17 (step 30).
3).

By driving the pressurizing pump 17, the gasoline vapor W2 in the fuel tank 1 stays in the bottom of the gas-liquid contacting cylinder 9, that is, in the gas-liquid contacting cylinder 9 through the evaporation passage 14 and the pressurizing pump 17. It is pumped to the bottom of the liquid gasoline W1 layer and contacts the liquid gasoline W1. Further, the pressure pump 17 pumps the gasoline vapor W2 and the throttle 11
Due to the presence of Nos. 21 and 21, the inside of the gas-liquid contact cylinder 9 is pressurized to a predetermined pressure.

After driving the pressurizing pump 17, the temperature sensor 30
Then, the ECU 16 determines whether the temperature in the gas-liquid contact cylinder 9 is within the set range, for example, less than 20 ° C. (step 3
04), if the temperature is 20 ° C or higher, the ECU 16 cools the cooler 3
1 is driven (step 305), and the inside of the gas-liquid contact cylinder 9 is moved to 2
Cool to below 0 ° C. When the refueling is completed, the circulation detector 15 determines that the gasoline vapor has not passed through the first evaporation passage 14 (step 306), and the ECU
The pressurizing pump 17 and the cooler 31 are stopped by 16 (step 307). If the temperature in the gas-liquid contact cylinder 9 is less than 20 ° C. in step 304, the process proceeds to step 306 without driving the cooler 31.

In the third embodiment, when the temperature in the gas-liquid contact cylinder 9 rises excessively due to the ambient temperature, it is cooled by the cooler 31 and, for example, 0. Absorbing action is performed at a pressure of 5 atm to 2.0 atm, and when the temperature in the gas-liquid contact cylinder 9 is lower than 20 ° C., the pressurizing pump 17 is operated with the cooler 31 stopped. The pressure in the gas-liquid contact cylinder 9 is increased to increase the pressure (atm) in the state shown in FIG. 5 to enhance the absorption effect.

Therefore, according to the present invention, the absorption effect can be enhanced by controlling the pressure and temperature in the gas-liquid contact cylinder 9 to the optimum state.

FIG. 10 shows a fourth embodiment.

The fourth embodiment is different from the first embodiment shown in FIG. 1 in that the pressurizing pump 1 in the first evaporation passage 14 is used.
The upstream side of No. 7 is connected to the second evaporation passage 18 on the downstream side of the throttle 21 by the bypass passage 14a.

Since the other structure is the same as that of the first embodiment, the same reference numerals are given to the same portions and the description thereof will be omitted.

In the fourth embodiment, the same actions and effects as those of the first embodiment are exhibited, and the following actions and effects are exhibited.

Normally, the refueling gun automatically stops the fuel supply when the pressure in the fuel tank 1 rises above a predetermined level. Therefore, in the one provided with the pressurizing pump 17 as described above, the pressurizing pump 17 is
If a pressure pump for extracting a large amount of gasoline vapor is used so that the pressure in the fuel tank 1 does not become the above-mentioned high pressure, the pressure pump 17 becomes a high flow rate type.

Therefore, in the fourth embodiment, the bypass passage 14a as described above is provided and the bypass passage 1 is provided.
This is to prevent a part of the gasoline vapor from escaping from 4a and prevent the excessive absorption of the gasoline vapor and the pressurizing pump 17 from having a high flow rate type.

FIG. 11 shows a fifth embodiment.

The fifth embodiment is similar to the third embodiment shown in FIG. 8 in that the bypass passage 14 is the same as the fourth embodiment.
a is provided.

Since the other structure is the same as that of the third embodiment, the same parts as those described above are designated by the same reference numerals and the description thereof will be omitted.

In the fifth embodiment, the action and effect of the third embodiment are exhibited, and the action and effect of the bypass passage 14a described in the fourth embodiment are exhibited.

In each of the above-mentioned embodiments, the bubble cylinder is used as the gas-liquid contact cylinder 9. However, in addition to this bubble cylinder, the liquid and gas are injected into the filling material so that the liquid and gas are filled in the filling material. , A spray tower in which the liquid is made into fine liquid droplets and sprayed into the gas to make contact, and the liquid is made to flow down in a thin film along the inner wall of the vertical pipe, and the gas flowing in the center of the pipe A known absorption tower such as a wet wall tower to be brought into contact may be used.

Further, the gas-liquid contact cylinder 9 may be arranged in the fuel tank 1.

[0080]

As described above, according to the present invention, the gasoline vapor in the fuel tank is brought into contact with the liquid gasoline to be absorbed, and the gasoline vapor is simply brought into contact with the liquid gasoline as in the conventional case. The absorption rate can be increased compared to.

Therefore, when the unabsorbed gasoline vapor is introduced into the canister, the amount of introduction into the canister can be reduced, and the canister can be downsized,
It is possible to reduce the processing amount of gasoline vapor in the engine.

[Brief description of drawings]

FIG. 1 is a system diagram of a gasoline vapor processing apparatus showing a first embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation in the first embodiment of FIG.

FIG. 3 is a characteristic diagram showing the absorption rate of gasoline vapor in Experiment 1 of the present invention.

FIG. 4 is a characteristic diagram showing the absorption rate of gasoline vapor in Experiment 2 of the present invention.

FIG. 5 is a characteristic diagram showing the absorption rate of gasoline vapor in Experiment 3 of the present invention.

FIG. 6 is a system diagram of a gasoline vapor processing apparatus showing a second embodiment of the present invention.

FIG. 7 is a flowchart for explaining the operation in the second embodiment of FIG.

FIG. 8 is a system diagram of a gasoline vapor processing apparatus showing a third embodiment of the present invention.

9 is a flow chart for explaining the operation in the third embodiment of FIG.

FIG. 10 is a system diagram of a gasoline vapor processing apparatus showing a fourth embodiment of the present invention.

FIG. 11 is a system diagram of a gasoline vapor processing apparatus showing a fifth embodiment of the present invention.

[Explanation of symbols]

1 fuel tank 9 Gas-liquid contact tube 11,21 aperture 17 Pressurizing pump 19 canisters 30 temperature sensor 31 cooler W1 liquid gasoline W2 gasoline vapor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 37/00 301 B60K 15/02 LF term (reference) 3D038 CA11 CB01 CC05 CC06 3G044 BA20 CA17 DA07 FA12 GA23 GA29

Claims (6)

[Claims] 1. Liquid gasoline in a fuel tank is introduced into a gas-liquid contact cylinder, and gasoline vapor in a fuel tank is introduced into the gas-liquid contact cylinder by a pressure pump to pressurize the inside of the gas-liquid contact cylinder. A method for treating gasoline vapor, characterized in that liquid gasoline introduced into the gas-liquid contact cylinder in this state is brought into contact with gasoline vapor. 2. The volume of the liquid gasoline in which the liquid gasoline in the fuel tank and the gasoline vapor in the fuel tank are introduced into the gas-liquid contact cylinder so that they are brought into contact with each other in the gas-liquid contact cylinder. And the volume of gasoline vapor is 1/200 or more, and the temperature in the gas-liquid contact cylinder is 20
A method for treating gasoline vapor, which is characterized in that the temperature is set below ℃. 3. Liquid gasoline in a fuel tank is introduced into a gas-liquid contact cylinder, and gasoline vapor in a fuel tank is introduced into the gas-liquid contact cylinder by a pressurizing pump to contact them in the gas-liquid contact cylinder. When the temperature in the gas-liquid contact cylinder is lower than 26.7 ° C., the ratio of the volume of the liquid gasoline to be contacted with the volume of gasoline vapor is set to 1/20.
The method for treating gasoline vapor is characterized in that the pressure inside the gas-liquid contact cylinder is set to 0 and the pressure inside the gas-liquid contact cylinder is set to 0.5 atm or more. 4. A gas-liquid contact tube for introducing liquid gasoline in a fuel tank, and a pressure pump for pressurizing and introducing gasoline vapor in a fuel tank into the gas-liquid contact tube. A processing apparatus for gasoline vapor, characterized in that the cylinder is pressurized to bring the introduced liquid gasoline into contact with gasoline vapor. 5. A gas-liquid contact cylinder for introducing liquid gasoline in the fuel tank and gasoline vapor in the fuel tank to bring them into contact with each other, and a cooler for cooling the gas-liquid contact cylinder. Gasoline vapor processing equipment. 6. A gas-liquid contact cylinder for introducing liquid gasoline in a fuel tank, a pressure pump for pressurizing and introducing gasoline vapor in a fuel tank into the gas-liquid contact cylinder, and an inside of the gas-liquid contact cylinder. And a cooler for cooling the gasoline vapor processing apparatus.