CN202707294U - Vehicle recovery device for gasoline vapor - Google Patents

Abstract

The utility model discloses a vehicle-mounted oil gas recovery device for collecting gasoline vapor generated in an automobile fuel tank. A cut-off valve system connected in parallel with a pressure relief valve and a first electromagnetic valve is arranged in the middle of the oil delivery pipe, and a refueling pipe is arranged on the upper part of the refueling pipe. The carbon canister is connected to the mouth groove of the oil filling pipe through the air pipe, an air filter is arranged in the middle of the air pipe, and a negative pressure pump is provided at the part connected to the carbon canister on the air pipe; the carbon canister is connected to the engine through the oil pipe The intake pipe is connected, and the middle part of the oil delivery pipe is provided with a second solenoid valve; the two solenoid valves and the negative pressure pump are respectively connected to the controller; only when the engine is working or the pressure in the fuel tank is too high will the second solenoid valve be controlled to open or pass The pressure relief valve opens the pipeline between the fuel tank and the carbon canister to guide the gasoline vapor in the fuel tank into the canister to ensure that the adsorbent in the canister will not be easily saturated. The canister is arranged between the fuel tank and the exhaust pipe to increase The adsorption capacity of the adsorbent is improved, and it will not heat the fuel tank.

Description

A vehicle-mounted oil and gas recovery device

technical field

The utility model relates to a vehicle-mounted oil gas recovery device, which is used for collecting the gasoline vapor produced in the fuel tank of the automobile.

Background technique

The gasoline stored in the fuel tank of the car will vaporize, so gasoline vapor will be generated in the fuel tank. The function of the on-board oil vapor recovery device is to recover the gasoline vapor generated in the fuel tank of the vehicle, which is mainly generated during the refueling process.

In the vehicle-mounted oil vapor recovery device, the gasoline vapor generated in the fuel tank is adsorbed by the adsorbent in the carbon canister, and then when the engine is running, the purified gasoline vapor in the carbon canister is sucked into the intake passage by the negative pressure of the intake passage of the internal combustion engine , and enter the engine cylinder together with the air for combustion.

According to the vehicle-mounted oil vapor recovery device described above, the gasoline vapor generated in the fuel tank can be absorbed by the adsorbent in the carbon canister to generate energy through combustion in the engine without being discharged into the atmosphere to cause pollution. However, the gasoline vapor in the current vehicle-mounted oil vapor recovery device will continuously enter the carbon tank to be adsorbed, causing the adsorbent in the carbon tank to be easily saturated, so that the adsorbent cannot be effectively used.

Contents of the invention

The utility model provides a vehicle-mounted oil and gas recovery device. Only when the vehicle-mounted oil and gas recovery device is working, gasoline vapor can be guided into the carbon canister, and the carbon canister can be heated during the adsorption operation to increase the adsorption capacity of the adsorbent. Adsorption capacity.

The technical scheme adopted by the utility model is: comprising a fuel tank and a charcoal tank, the charcoal tank is connected with the fuel tank through a fuel delivery pipe, and a cut-off valve system connected in parallel by a pressure relief valve and a first electromagnetic valve is arranged in the middle of the oil delivery pipe, and the pressure relief valve is in the The shut-off valve system opens when the pressure difference in the fuel delivery pipe at both ends reaches a certain level; in the fuel tank, the oil vapor recovery valve and the ball valve are connected to the fuel delivery pipe; the fuel tank is also connected to the refueling pipe, and one end of the circulation pipe is connected to the upper part of the fuel tank, and the other end is connected to the refueling pipe Upper part; the upper part of the fuel pipe is provided with a fuel pipe mouth groove, the carbon canister is connected with the fuel pipe mouth groove through the air pipe, an air filter is arranged in the middle of the air pipe, and a negative pressure is provided at the part of the air pipe connected with the carbon canister. Pump; the carbon tank is connected to the intake pipe of the engine through the oil delivery pipe, the other end of the intake pipe is connected to the air chamber, and the middle part of the oil delivery pipe is provided with a second solenoid valve; There is a motor; the oil suction pump is set on the fuel tank and is at the bottom of the fuel tank and connected to the intake pipe through the oil delivery pipe; the first and second solenoid valves and the negative pressure pump are respectively connected to the controller; when the engine is working, the second solenoid valve is open state, when the engine stops working, the first solenoid valve is in the closed state.

Further, the present invention can be provided with fuel tank in the front region of automobile rear axle and near automobile transverse centerline, and carbon canister is arranged between fuel tank and automobile exhaust pipe; Composition, the deflector block is fixed to the front of the canister body, and the deflector block is provided with an inclined side wall in the direction of the front end of the car, and the inclined side wall faces the air flow formed from the front to the rear of the car when the car moves forward.

In the present invention, a fuel tank can also be arranged in the front area of the rear axle of the automobile and near the transverse centerline of the automobile, and the carbon canister is arranged between the fuel tank and the exhaust pipe of the automobile, and the front part of the canister is inclined toward the exhaust pipe.

The beneficial effects of the utility model are:

1. Only when the engine is working or the pressure in the fuel tank is too high will the solenoid valve between the fuel tank and the carbon tank be controlled by the engine ECU to open or the pipeline between the fuel tank and the carbon tank will be opened through the pressure relief valve to guide the fuel The gasoline vapor in the tank enters the carbon tank, so as to ensure that the adsorbent in the carbon tank will not be easily saturated. Only when the solenoid valve between the canister and the engine is controlled to open when the engine is working, the gasoline and air absorbed in the canister will be guided into the engine intake port to enter the engine for combustion, and gasoline vapor will not be discharged into the air. It can completely absorb the gasoline vapor generated in the fuel tank and send it into the engine to burn for work and prevent the premature saturation of the adsorbent in the carbon tank. the

2. The shut-off valve system composed of solenoid valve and pressure relief valve can close the oil pipeline very well, so as to ensure that the liquid gasoline and gasoline vapor in the fuel tank cannot be guided into the carbon tank at any time. Gasoline vapor will be guided into the canister to ensure the effective use of the adsorbent in the canister.

3. The controller's control of the solenoid valve and the negative pressure pump can accurately ensure that the gasoline vapor in the fuel tank and carbon canister is sent into the engine for combustion and work. By controlling the pressure in the fuel tank, etc., the process of absorbing gasoline vapor is controlled and guided into the engine for combustion.

4. The carbon tank is arranged between the fuel tank and the exhaust pipe, which can ensure that the adsorbent in the carbon tank is heated by the heat of the exhaust gas discharged from the exhaust pipe, thereby increasing the adsorption capacity of the adsorbent, and will not be heated to Fuel tank. This arrangement structure is scientific and reasonable, and can promote the adsorption efficiency of the adsorbent activated carbon for gasoline.

5. The inclined arrangement of the deflector block in the carbon tank or the carbon tank can reduce the temperature of the fuel tank by using the wind from the front to the rear of the car when the car is moving forward.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

Fig. 1 is the overall schematic diagram of the utility model vehicle-mounted oil gas recovery device;

Fig. 2 is a schematic diagram of the first arrangement of the canister and the fuel tank in Fig. 1;

Fig. 3 is an enlarged schematic view of the carbon tank and its surrounding structures in Fig. 2;

Fig. 4 is a second arrangement schematic diagram of the carbon canister and the fuel tank in Fig. 1;

In the figure: 1. Fuel tank; 2. Carbon tank; 3. Adsorbent; 4. Fuel pipe; 5. Circulation pipe; 6. Cover; ;10. Ball valve; 11. Oil pipeline; 12. Slow pressure valve; 13. Solenoid valve; 14. Negative pressure pump; 15. Air filter; 16. Air pipe; 17. Oil pipeline; 18. Solenoid valve; ;20. Oil gauge; 21. Float; 22. Pressure sensor; 23. Oil pipe; 24. Engine; 25. Intake pipe; 26. Air chamber; 27. Motor; 28. Choke valve; 29. Air filter; 30. Gas sensor; 31. Controller; 32. Accelerator pedal position sensor; 33. Crankshaft position sensor; 34. Exhaust pipe; 35. Car rear axle; 36. Left and right wheels; 38. Canister body; 39. Diversion block.

Detailed ways

Fig. 1 has shown the overall structure of the vehicle-mounted oil vapor recovery device of the present utility model, and the utility model mainly comprises fuel tank 1, oil vapor recovery valve 9, ball valve 10, fuel delivery pipe 11, pressure relief valve 12, electromagnetic valve 13, charcoal canister 2, electromagnetic Valve 18, negative pressure pump 14, pressure sensor 22, etc.

There is an adsorbent 3 inside the charcoal tank 2, and the charcoal tank 2 is connected to the fuel tank 1 through the oil delivery pipe 11. In the middle of the oil delivery pipe 11, there is a cut-off valve system connected in parallel by a pressure relief valve 12 and a solenoid valve 13. The pressure relief valve 12 When the pressure difference in the oil delivery pipe 11 at both ends of the shut-off valve system reaches a certain value, it opens, and the electromagnetic valve 13 is connected to the ECU controller 31 and controlled by the controller 31 . Therefore, the pressure relief valve 12 and the solenoid valve 13 of the cut-off valve system control the opening and closing of the oil delivery pipe 11 . In the fuel tank 1 , connected to the fuel delivery pipe 11 are an oil vapor recovery valve 9 and a ball valve 10 . When refueling, along with the rise of the liquid level, when the pressure in the fuel tank 1 rose, the oil vapor recovery valve 9 just opened. In this way, when the solenoid valve 13 is opened, the gasoline vapor is guided into the carbon canister 2 through the fuel delivery pipe 11 , thereby relieving the pressure in the fuel tank 1 . When the automobile is tilted, the ball valve 10 will be closed to prevent the gasoline liquid from leaking out from the fuel tank 1 through the fuel delivery pipe 11. Therefore, when at least one of the pressure relief valve 12 and the solenoid valve 13 is opened and at least one of the oil vapor recovery valve 9 and the ball valve 10 is opened, the gasoline vapor is guided into the carbon canister 2 through the output pipe 11 and is absorbed by the gas in the canister 2. Absorbed by adsorbent 3.

The fuel tank 1 is also connected with the filling pipe 4, and one end of the circulation pipe 5 is connected to the top of the fuel tank 1, and the other end is connected to the top of the filling pipe 4. The top of the filling pipe 4 is provided with a filling pipe cover 7, and the filling pipe cover 7 can be controlled by the controller 31. Control, the filling pipe 4 top is also provided with the filling pipe mouth groove 8, uses a cover 6 sealing above the filling pipe mouth groove 8.

Charcoal canister 2 is also connected to each other with filling nozzle groove 8 by air pipe 16. An air filter 15 is arranged in the middle of the air pipe 16 and a negative pressure pump 14 is provided at the part connected to the canister 2 on the air pipe 16 . The negative pressure pump 14 is connected to the controller 31 and is controlled by the controller 31 . The negative pressure pump 14 can close the gas pipe 16 to isolate the carbon canister 2 from the atmosphere.

The charcoal tank 2 is connected with the intake pipe 25 of the engine 24 through the oil delivery pipe 17. A solenoid valve 18 is arranged in the middle of the oil delivery pipe 17. The solenoid valve 18 is connected to the controller 31 and controlled by the controller 31 to open and close the oil delivery pipe 17. .

One end of intake pipe 25 is connected with engine 24, and the other end is connected with air chamber 26, and air chamber 26 is also connected with air filter 29, is provided with motor 27 between air chamber 26 and air filter 29, and air chamber 26 is used for temporarily The air entering through the air filter 29 is stored, and the amount of air entering the air chamber 26 is determined by the choke valve 28 controlled by the motor 27 . The choke valve 28 is in the middle of the intake pipe and is connected with the motor 27, and its rotational position is controlled by the motor 27.

The controller 31 controls the car as a whole. It is connected with various sensors through communication cables, such as accelerator pedal position sensor 32 and crankshaft position sensor 33 , pressure sensor 22 , fuel gauge 20 and gas sensor 30 in the fuel tank. The gas sensor 30 is installed at the outlet of the air filter 29 , and the pressure sensor 22 is installed near the oil suction pump 19 on the top of the fuel tank 1 . The oil gauge 20 and the float 21 are connected together and both are arranged in the oil suction pump 19, and the float 21 floats on the gasoline liquid surface, which can assist in measuring the oil quantity. The oil suction pump 19 is installed on the fuel tank 1 at the bottom of the fuel tank 1 and is connected to the intake pipe 25 through the fuel delivery pipe 23 . On the basis of the signals sent by various sensors, the controller 31 outputs signals to different parts through communication cables, so as to fully control different parts of the car. For example, the controller 31 measures the rotation speed of the engine 24 through the crankshaft position sensor 33 and controls the motor 27 on the basis of measuring the speed of the engine 24 through the accelerator pedal position sensor 32 to adjust the choke valve 28 to adjust the intake air volume.

When the engine 24 is working, the controller 31 will open the solenoid valve 18, and use the negative pressure in the intake passage 25 to suck gasoline from the carbon tank 2 into the intake passage 25 through the oil delivery pipe 17. At this time, the controller 31 opens the intake pipe 14 by controlling the negative pressure pump 14 to guide air into the canister 2 . In this way, the gasoline adsorbed by the adsorbent 3 enters the intake passage 25 together with the air through the fuel delivery pipe 17 .

It should be noted that, except when refueling, under the control of the controller 31, the solenoid valve 13 closes the oil delivery pipe 11 when the engine 24 stops working. In this way, the fuel tank 1 is in a sealed state when the engine 24 stops working, and no gasoline vapor will be guided into the carbon canister 2 unless the pressure in the fuel tank 1 is large enough to open the pressure relief valve 12 . In this way, when the engine 24 stops working and the pressure in the fuel tank 1 is not large enough, the fuel tank 1 is closed, the vehicle-mounted oil vapor recovery device does not work, no gasoline vapor can enter the carbon tank 2, and the adsorbent 3 will not will be easily saturated.

When the engine 24 was not working, the fuel tank 1 was closed, and due to the vaporization of gasoline, the pressure in the fuel tank 1 rose. Before refueling, when the filler cap 7 was opened, the air pressure in the fuel tank 1 was higher than the atmospheric pressure, and the gasoline vapor was discharged into the atmosphere by the filler pipe 4. Therefore, according to the scheme of the present utility model, in the vehicle-mounted oil vapor recovery device, when refueling, the solenoid valve 13 is first opened to guide the gasoline vapor in the fuel tank 1 to enter the charcoal tank 2 through the oil delivery pipe 11, thereby reducing the amount of oil in the fuel tank. 1 pressure. When the pressure in the fuel tank 1 measured by the pressure sensor 22 drops to an appropriate level, the fuel cap 7 will be unlocked and opened.

From the perspective of promoting the adsorption effect of the adsorbent 3 on gasoline vapor, it is best to heat the adsorbent 3 during adsorption, and use the heat of the exhaust gas discharged from the exhaust pipe to heat the carbon canister 2. But because the charcoal canister 2 and the fuel tank 1 are connected together by the fuel delivery pipe 11, it is easy to heat the fuel tank 1 when the charcoal canister 2 is heated. When the fuel tank 1 is heated, the gasoline liquid in the fuel tank 1 will be violently vaporized, causing a lot of gasoline vapor to enter the carbon tank 2 and be adsorbed by the adsorbent 3, and the result is that the adsorbent 3 is quickly saturated . If the distance between the fuel tank 1 and the carbon canister 2 is too large, the connected oil delivery pipe 11 will be too long. Also, in many cases, the arrangement space between the fuel tank 1 and the canister 2 is limited. If the adsorption effect is increased by increasing the volume of the carbon canister 2 to increase the quantity of the adsorbent 3, the increase in the size of the carbon canister will lead to an increase in the size of the entire vehicle-mounted oil and gas recovery device. Therefore, a structure is needed to heat the charcoal tank 2 without heating the fuel tank 1.

Fig. 2 is a schematic diagram of the first arrangement of the canister 2 provided by the present invention, the two ends of the rear axle 35 of the automobile are connected to the left and right wheels 36, and Fig. 3 is an enlarged schematic diagram of the part surrounded by the dotted line in Fig. 2 . As shown in FIG. 2 , the fuel tank 1 is arranged in the area in front of the rear axle 35 of the automobile, and is arranged near the transverse centerline of the automobile. The exhaust pipe 34 is arranged on one side in the vehicle transverse direction. According to the structure provided by the utility model, the carbon canister 2 is arranged between the fuel tank 1 and the exhaust pipe 34 .

As shown in Figure 3, according to the utility model, the charcoal tank 2 is composed of a diversion block 39 and a charcoal tank body 38, and the diversion block 39 is fixed to the front part of the charcoal tank body 38, that is, the diversion block 39 is fixed on the charcoal tank body. The position of the tank is located in the direction of the front of the car. The deflector block 39 has an inclined side wall A in the direction of the front end of the car, which is inclined towards the fuel tank 1. The inclined side wall A forms an angle with the air flow from the front of the car to the rear when the car moves forward, facing the air. flow. When the car is moving forward, the wind from the front to the rear of the car is guided by the side wall A to blow to the fuel tank 1, and the quantity and speed of the air passing through the surface of the fuel tank 1 are increased. The heat exchange of the fuel tank 1 has also been strengthened, thereby cooling the fuel tank 1. But at the same time, the carbon canister 2 is heated by the heat of the exhaust gas discharged from the exhaust pipe to promote the adsorption capacity of the adsorbent 3 .

As shown in Fig. 4, the second kind of arrangement schematic diagram of the carbon tank 2 provided, the carbon tank 2 is only made up of a separate carbon tank tank body 38, when arranging, the extension line of the centerline of the carbon tank 2 and the car There is an angle to the transverse centerline of the canister 2, and the front portion of the canister 2 is inclined towards the exhaust pipe 34, so that an angle is formed between the side wall B of the canister 2 and the opposite side wall of the fuel tank. Then when the car is moving forward, the wind facing the car from the front of the car to the rear of the car will hit the side wall B of the carbon tank 2, and the side wall B will guide the wind to the side of the fuel tank 1, thereby playing a role of harmony The same effect as guide block 39 in Fig. 3 .

Claims (4)

1. a vehicle-mounted oil vapor recovery device comprises fuel tank (1 )With the charcoal tank (2 ), the charcoal tank (2 )Pass through transport pipe (11 )With fuel tank (1 )Link to each other, it is characterized in that: transport pipe (11 )The centre be provided with one by slow pressure valve (12 )With the first solenoid valve (13 )Stop valve system in parallel, slow pressure valve (12 )Transport pipe at stop valve system two ends (11 )Internal pressure differences reaches one and regularly opens; At fuel tank (1 )In, and transport pipe (11 )What link to each other is the oil gas recovery valve (9 )And ball valve (10 )Fuel tank (1 )Also connect oil filling pipe (4 ), Circulation pipe (5 )One end is published in instalments fuel tank (1)Top, the other end is published in instalments oil filling pipe (4 )Top; Oil filling pipe (4 )Top is provided with the filler neck groove (8 ), the charcoal tank (2 )Pass through tracheae (16 )With the filler neck groove (8 )Link to each other, at tracheae (16 )The intermediate portion be provided with an air-strainer (15 ), at tracheae (16 )Go up and the charcoal tank (2 )The position that links to each other is provided with negative pressure pump (14 )The charcoal tank (2 )Pass through transport pipe (17 )With motor (24 )Suction tude (25 )Link to each other suction tude (25 )The other end and air chamber (26 )Link to each other transport pipe (17 )The intermediate portion be provided with the second solenoid valve (18 )Air chamber (26 )Connect air-strainer (29 ), air chamber (26 )And air-strainer (29 )Between be provided with motor (27 )Oil scavenge pump (19 )Be located at fuel tank (1 )Upper and be in fuel tank (1 )Bottom and pass through transport pipe (23 )With suction tude (25 )Link to each other; First, second solenoid valve (13,18) and negative pressure pump (14 )Connect respectively controller (31 )Motor (24 ) when workingThe second solenoid valve (18 )Open mode, motor (24 )The first solenoid valve when quitting work (13 )It is closed condition.

2. a kind of vehicle-mounted oil vapor recovery device according to claim 1, it is characterized in that: in the front region of automobile hind axle and described fuel tank (1) is set, between described fuel tank (1) and automobile exhaust pipe (34), described charcoal tank (2) is set near the automobile cross central line.

3. a kind of vehicle-mounted oil vapor recovery device according to claim 2, it is characterized in that: described charcoal tank (2) is comprised of a baffle (39) and charcoal tank (38), the affixed charcoal tank of baffle (39) (38) front portion, baffle (39) is provided with the sidewall A of an inclination, the air stream that the sidewall A of this inclination forms at the front extreme direction of automobile from the vehicle front to the rear when automobile advances.

4. a kind of vehicle-mounted oil vapor recovery device according to claim 2, it is characterized in that: the front portion of described charcoal tank (2) tilts towards outlet pipe (34) direction.

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