CN216617702U - Desorption system and vehicle - Google Patents

Abstract

The present disclosure relates to a desorption system and vehicle, desorption system includes: the carbon tank is provided with a desorption mode and a non-desorption mode and is provided with an adsorption port, a desorption port and an atmosphere port, and the atmosphere port can enable outside atmosphere to be sucked into the carbon tank when the carbon tank is in the desorption mode; the fuel tank is connected with the adsorption port through a first pipeline, the first pipeline is provided with a steam electric control valve, and the steam electric control valve can be opened or closed according to the mode of the carbon canister. The desorption amount of the carbon canister can be improved by the scheme.

Description

Desorption system and vehicle

Technical Field

The disclosure belongs to the field of vehicles, and particularly relates to a desorption system and a vehicle.

Background

Due to the volatility of fuel and the influence of ambient temperature, fuel in a vehicle can be discharged to the atmosphere in the form of fuel vapor, so that the environment is polluted and the human health is harmed. Thus, national emission regulations set strict emission limits for vehicle evaporative emissions.

Vehicle evaporative emission control systems are an important component of vehicles, which typically utilize a canister to adsorb fuel vapors to control evaporative emissions. To meet long term emissions requirements, the canister needs to be desorbed and regenerated with fresh atmosphere. In the case of a given canister size, the capacity and emission level depend on the desorption gas flow rate. If the desorption gas flow is large, it indicates that the working capacity and emission level of the carbon canister are better, and vice versa.

The charcoal jar exists not enough and desorption noise big problem at present.

SUMMERY OF THE UTILITY MODEL

An object of this disclosure is to provide a desorption system and vehicle for solve the not enough and big problem of desorption noise of charcoal jar desorption volume.

A first aspect of the present disclosure provides a desorption system; wherein, desorption system includes: the carbon tank is provided with a desorption mode and a non-desorption mode and is provided with an adsorption port, a desorption port and an atmosphere port, and the atmosphere port can enable outside atmosphere to be sucked into the carbon tank when the carbon tank is in the desorption mode; the fuel tank is connected with the adsorption port through a first pipeline, the first pipeline is provided with a steam electric control valve, and the steam electric control valve can be opened or closed according to the mode of the carbon canister.

In an exemplary embodiment of the present disclosure, the steam electronic control valve can be in a closed state when the canister is in the desorption mode, and can also be in an open state when the canister is in the non-desorption mode.

In an exemplary embodiment of the present disclosure, further comprising: the pressure detector is connected with the fuel tank and is used for detecting the air pressure in the fuel tank; the opening degree of the steam electric control valve can be adjusted and is in communication connection with the pressure detector; when the carbon canister is in a desorption mode, the steam electric control valve is used for adjusting or switching to a closed state according to the air pressure detected by the pressure detector under different opening degrees.

In an exemplary embodiment of the present disclosure, the gas pressure in the fuel tank includes a first section, a second section, and a third section, the gas pressure in the third section is greater than the gas pressure in the second section, and the gas pressure in the second section is greater than the gas pressure in the first section; when the air pressure of the fuel tank is in a first interval, the opening degree of the steam electric control valve is gradually increased; the steam electric control valve is switched to a closed state when the air pressure of the fuel tank is in a second interval; and when the air pressure of the fuel tank is in a third interval, the opening degree of the steam electric control valve is gradually increased.

In an exemplary embodiment of the present disclosure, the desorption system further includes: the engine, through the second pipeline with the desorption mouth links to each other, the second pipeline is equipped with the charcoal jar electric control valve, the charcoal jar electric control valve can be according to the mode of charcoal jar is opened or is closed.

In an exemplary embodiment of the present disclosure, the canister electrical control valve can be in an open state when the canister is in the desorption mode, and can also be in a closed state when the canister is in the non-desorption mode.

In an exemplary embodiment of the present disclosure, the steam electric control valve is a normally open solenoid valve; and/or the carbon tank electric control valve is a normally closed electromagnetic valve.

In an exemplary embodiment of the present disclosure, further comprising: and the electronic control unit is in communication connection with the carbon tank electric control valve and the steam electric control valve and is used for controlling the on-off states of the carbon tank electric control valve and the steam electric control valve when the carbon tank is in an desorption and non-desorption mode.

In an exemplary embodiment of the present disclosure, further comprising: the liquid accumulator is connected between the fuel tank and the first pipeline, a containing cavity and a baffle are arranged in the liquid accumulator, the baffle is used for blocking the fuel overflowing from the fuel tank to flow to the carbon canister, and the containing cavity is used for collecting the fuel overflowing from the fuel tank.

In an exemplary embodiment of the present disclosure, further comprising: the leakage diagnosis module is connected with the atmosphere port and used for detecting whether fuel steam leaks from the atmosphere port; and/or, the desorption system further comprises: and the filter is connected with the atmosphere port and is used for filtering the gas discharged from the atmosphere port.

In an exemplary embodiment of the present disclosure, the fuel tank includes a filler pipe connected to the tank body, a tank body, and a circulation pipe having one end connected to the filler pipe and the other end connected to the tank body; the box body is connected with the adsorption port through the first pipeline.

A second aspect of the present disclosure provides a vehicle including: a vehicle body, and a desorption system as in any one of the preceding; the desorption system is located in the vehicle body.

The beneficial effect of this scheme of disclosure:

this scheme sets up the steam automatically controlled valve between charcoal jar and fuel tank, and the steam automatically controlled valve can be opened or close according to the mode of charcoal jar to the opportunity of fuel vapor flow direction charcoal jar in the accurate control fuel tank, and then improve charcoal jar desorption ability and noise reduction.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.

Fig. 1 shows a schematic structural diagram of a desorption system according to a first embodiment of the present disclosure;

fig. 2 to 5 show operation principle diagrams of the desorption system according to the first embodiment of the disclosure in different states.

Description of reference numerals:

1. a fuel tank; 1a, a box body; 1b, an oil filling pipe; 1c, a circulation pipe; 4. a fuel pump; 5. an oil supply pipe; 6. an oiling stop valve; 7. a liquid accumulator; 8. a third pipeline; 9. a gravity valve; 10. a pressure detector; 11. a first line; 12. a second line; 13. an electronic control unit; 14. a third line; 15. a first pipeline; 16. a steam electric control valve; 18. a canister; 181. an adsorption port; 182. a desorption port; 183. an atmospheric port; 19. a second pipeline; 20a, a leak diagnosis module; 20b, a filter; 21. a canister electrical valve; 23. an engine.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

In the present disclosure, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the disclosure.

Example one

As shown in fig. 1-5, embodiments of the present disclosure provide a desorption system, including: the canister 18 has a desorption mode and a non-desorption mode, the canister 18 is provided with an adsorption port 181, a desorption port 182 and an atmosphere port 183, and the atmosphere port 183 can enable outside atmosphere to be sucked into the canister 18 when the canister 18 is in the desorption mode; the fuel tank 1 is connected with the adsorption port 181 through a first pipeline 15, the first pipeline 15 is provided with a steam electric control valve 16, and the steam electric control valve 16 can be opened or closed according to the mode of a carbon canister 18.

That is, the vapor electronic control valve 16 is switched according to the mode of the canister 18, so as to precisely control the timing of the fuel vapor flowing to the canister 18 in the fuel tank 1, improve the operation capability of the canister 18, and reduce the emission and noise.

The following will explain each structure of the desorption system in detail with reference to the drawings.

The fuel tank 1 includes a tank body 1a, a filler pipe 1b, and a circulation pipe 1 c. The tank body 1a may be an inner cavity formed by stamping, welding or blow molding, and may be made of metal or plastic. The lower part of the inner cavity of the box body 1a is used for storing fuel oil, and the upper part of the inner cavity is used for storing fuel oil steam.

The filler pipe 1b is connected to the tank body 1a for filling fuel. The oil filling pipe 1b is a pipe fitting made of metal or plastic, and the tail part of the oil filling pipe can be provided with a rubber pipe, a quick-connect plug and a fastener and is used for being connected with the tank body 1a or can be connected with the tank body 1a in a welding mode. The head of the device can be provided with a filler cap for sealing, and the lower part of the head of the device can be provided with a joint which is connected with the circulating pipe 1c in a rubber pipe, a quick-inserting joint and other modes.

The circulation pipe 1c has one end connected to the filler pipe 1b and the other end connected to the tank main body 1 a. Further, both ends of the circulation pipe 1c may be provided with two joints to be connected to the filler pipe 1b and the tank body 1a, respectively. The circulating pipe 1c is a fuel steam pipeline made of nylon, rubber and metal, and the material can be selected according to the arrangement requirement of the whole vehicle. The circulation pipe 1c can circulate part of the fuel vapor between the tank body 1a and the filler pipe 1b, thereby reducing the fuel vapor entering the canister 18, resulting in a smaller amount of desorption required for the canister 18, and reducing the workload of the canister 18.

The fuel tank 1 may further be provided with a refueling stop Valve 6(Fill Limit Vent Valve, FLVV for short). The refueling stop valve 6 can be a valve body constructed by injection molding and can be installed at the top of the tank body 1a in a welding or clamping manner. The refueling stop valve 6 is internally provided with a valve core or a valve plate which can float upwards and close along with fuel submergence and is used for controlling the refueling amount of the fuel tank 1. Specifically, the refueling stop valve 6 may be provided with an exhaust port, the exhaust port may be connected to a pipeline, and the valve core or the valve plate may be disposed at the exhaust port. When the fuel liquid level submerges the exhaust port, the valve core or the valve plate rises under the action of fuel buoyancy, the steam exhaust port is closed, and the pressure in the tank body 1a rises to cause that the fuel in the fuel filling pipe 1b cannot be added and the gun jumps. When fuel does not flood the vent, fuel vapor may flow through the vent into the line to enter the canister 18.

The fuel tank 1 may also be provided with a gravity valve 9 (GVV for short). The gravity valve 9 can be a valve body gravity valve constructed by injection molding and can be installed on the top of the fuel tank 1 in a welding or clamping mode. The gravity valve 9 is internally provided with a valve core or a valve plate which can float upwards and close along with fuel submergence and is used for discharging oil gas in the fuel tank 1 when the refueling stop valve 6 is closed so as to release the pressure in the fuel tank 1. A vent is also provided on the gravity valve 9 to connect to a line to allow fuel vapor to pass to the canister 18.

A fuel pump 4 may also be provided in the tank body 1 a. The fuel pump 4 mainly comprises a sealing flange, an oil outlet joint, a pump core, a fuel pressure regulator, a filter, a liquid level sensor, an oil storage barrel, an auxiliary wire harness, a pipeline and other structures. Wherein, the oil storage barrel of the fuel pump 4 is arranged at the bottom of the fuel tank 1, and the sealing flange of the fuel pump 4 is arranged at the top of the fuel tank 1.

The tank body 1a can be further provided with a pressure detector 10, and the pressure detector 10 can be welded inside and outside or clamped at the top of the fuel tank 1 and used for detecting the pressure of fuel steam inside the fuel tank 1. The steam electronic control valve 16 can be switched in a plurality of states according to the air pressure detected by the pressure detector 10. Therefore, the closing time of the steam electronic control valve 16 can be more accurate, and the fuel tank 1 can obtain better overpressure protection. This will be explained in detail later with reference to the operating schematic diagram of the desorption system.

The canister 18 may be a plastic housing containing activated carbon with three ports: an adsorption port 181 connected to the first pipe 15; a desorption port 182 connected to the second pipe 19; and an atmosphere port 183 communicating with the outside atmosphere.

The first pipeline 15 and the second pipeline 19 are fuel steam pipelines, and the materials can be nylon, rubber and metal, and are selected according to the arrangement requirement of the whole vehicle. The first line 15 may comprise a first section for connecting the fuel tank 1 to the vapor electronic control valve 16 and a second section for connecting the adsorption port 181 to the vapor electronic control valve 16. The second line 19 may include a first section connected to the desorption port 182 and the canister electronic control valve 21, and a second section connected to the canister electronic control valve 21 and the engine 23.

In some embodiments, the canister 18 may be connected directly to the fuel tank 1 via the first line 15. In other embodiments, as shown in fig. 1, a liquid accumulator 7 may be further disposed in the desorption system, and the liquid accumulator 7 is connected between the fuel tank 1 and the first pipeline 15. In addition, the liquid accumulation device 7 and the fuel tank 1 can be connected through a third pipeline 8. The third pipeline 8 is a fuel steam pipeline, the material of the third pipeline can be nylon, rubber and metal, and corresponding materials can be selected according to the arrangement requirement of the whole vehicle.

It will be appreciated that during sloshing of the fuel tank 1, there may be some spillage of liquid fuel. The accumulator 7 has a receiving chamber for collecting fuel overflowing from the fuel tank 1 and a baffle for blocking the fuel overflowing from the fuel tank 1 from flowing to the canister 18. Thus, the accumulator 7 may protect the canister 18 from liquid fuel, thereby further improving the emissions performance of the canister 18. The material of the liquid accumulator 7 can be plastic or metal.

The desorption system may also include a leak diagnostic module 20a connected to the atmospheric port 183 for detecting a leak of fuel vapor from the fuel system. The leak diagnosis module 20a may perform leak diagnosis on the fuel system by means of elemental detection or in combination with the pressure change detected by the pressure detector 10, for example, it may detect the content of hydrocarbon to determine whether there is fuel vapor discharged from the atmospheric port 183 or leaked from the fuel system.

The desorption system may further include: a filter 20b connected to the atmosphere port 183 for filtering dust from the air entering the canister 18 to prevent the dust from clogging the canister 18.

The engine 23 is connected to the desorption port 182 via a second line 19, the second line 19 being provided with an electrically controlled canister valve 21, the electrically controlled canister valve 21 being capable of being opened or closed depending on the mode of the canister 18. The engine 23 may be a gasoline engine, and a negative pressure port of an intake system of the engine is connected to the second pipeline 19, and the negative pressure port has a position not limited to one on the intake system. The oil receiving port of the engine 23 is connected to the fuel pump 4 through the oil supply pipe 5, and is not limited to one position. The oil supply pipe 5 is a fuel oil pipe, can be made of nylon, rubber and metal, and can be made of corresponding materials according to the arrangement requirement of the whole vehicle. The fuel supply pipe 5 may be provided with a joint for connecting the fuel pump 4 and the engine 23.

The steam electronic control valve 16 and the canister electronic control valve 21 will be described in detail below.

In some embodiments, the steam electronically controlled valve 16 can be in a closed state when the canister 18 is in the desorption mode, and can also be in an open state when the canister 18 is in the non-desorption mode. That is, the steam electronic control valve 16 has two states of fully open and fully closed, and these two states are determined according to the desorption timing of the canister 18.

In other embodiments, the steam electronic control valve 16 is also in communication with the pressure detector 10; the steam electronic control valve 16 is used to switch among a plurality of modes according to the air pressure detected by the pressure detector 10 when the canister 18 is in the desorption state. In other words, the steam electrically controlled valve 16 is in a fully open state when the canister 18 is in the non-desorption mode, and thus the air pressure may not be considered; the steam electronic control valve 16 also needs to be combined with the air pressure when the carbon canister 18 is in the desorption mode to switch the states. Further, when the steam electric control valve 16 is in the desorption mode at the canister 18, the steam electric control valve 16 may have a fully opened state and a fully closed state, and may also have a partially opened state, and the opening degree thereof can be adjusted. This will be explained in detail later in connection with the operating principle diagram of the desorption system.

Since the steam electric control valve 16 is in an open state more often, the steam electric control valve 16 may be set as a normally open electric valve to facilitate control thereof. In other embodiments, the steam electronic control valve 16 may also be configured as a normally closed electronic valve.

The canister electronic control valve 21 can be in an open state when the canister 18 is in the desorption mode to allow fuel vapor to enter the engine 23 for combustion. The canister electronic control valve 21 can also be closed when the canister 18 is in the non-desorption mode. Since the canister electrical control valve 21 is closed more often, it may be provided as a normally closed solenoid valve. In other embodiments, it may be configured as a normally open solenoid valve.

The desorption system may further include: and the electronic control unit 13 is in communication connection with the carbon tank electronic control valve 21 and the steam electronic control valve 16 and is used for controlling the on-off states of the carbon tank electronic control valve 21 and the steam electronic control valve 16 when the carbon tank 18 is in the desorption and non-desorption modes. Furthermore, the electronic control unit 13 may be communicatively connected to the engine 23 and the pressure detector 10, so as to control the opening and closing of the steam electronic control valve 16 and the canister electronic control valve 21 according to the operating condition of the engine 23 and the data of the pressure detector 10. This will be explained in detail later in connection with the operating principle diagram of the desorption system.

Correspondingly, the desorption system further comprises a first line 11, a second line 12 and a third line 14, wherein the first line 11 connects the electronic control unit 13 with the pressure detector 10. A second line 12 connects the electronic control unit 13 with the steam electronic control valve 16. A third line 14 connects the electronic control unit 13 with the canister electronic control valve 21. In addition, the desorption system comprises a fourth line connecting the electronic control unit 13 and the engine 23.

The operation of the desorption system will be explained in detail below.

Referring to fig. 2, fig. 2 is a schematic diagram of the desorption system in a state where the canister electronic control valve 21 is in a closed state and the steam electronic control valve 16 is in an open state, and the canister 18 is in a non-desorption mode, and the operation principle is as follows:

fuel vapor enters the canister 18 for storage in the direction indicated by the arrow. That is, when fuel vapor is generated inside the fuel tank 1, the fuel vapor may enter the canister 18 through the first pipe 15 and be adsorbed in the activated carbon of the canister 18.

Referring to fig. 3, fig. 3 is a schematic diagram of the operation of the desorption system when the canister electronic control valve 21 is in the open state and the steam electronic control valve 16 is in the closed state, and the canister 18 is in the desorption mode, and the operation principle is as follows:

the bold solid arrows represent the flow direction of the mixed gas of the fuel vapor and the atmosphere. The dashed arrows represent the direction of flow of atmospheric air into the canister 18. That is, when the operating condition of the engine 23 satisfies a certain condition, the electronic control unit 13 may open the canister electronic control valve 21 and close the steam electronic control valve 16. Thus, ambient fresh atmosphere may be admitted from the leak diagnostic module 20 a/filter 20b into the atmosphere port 183 and then into the canister 18, with the activated carbon having previously adsorbed fuel vapors being flushed by the atmosphere. The mixed fuel vapor and atmospheric air then enter the engine 23 through the first section of the second conduit 19, the canister electronic control valve 21, and the second section of the second conduit 19 for combustion, and the canister 18 is regenerated. Since the fuel stored in the canister 18 is flushed entirely with fresh atmospheric air, the regeneration is more efficient.

Compared with the state that the steam electric control valve 16 is fully opened, when the steam electric control valve 16 is fully closed, the fresh air entering the air port 183 can be increased by about 10%, so that the desorption amount is favorably improved.

In addition, because the steam electric control valve 16 is closed, the negative pressure pulsation of the engine 23 hardly causes the vibration of the valve sheet inside the refueling stop valve 6, thereby avoiding the noise problem.

Further, since the adsorption port 181 does not flow into the fuel vapor, the streamline inside the canister 18 is more regular, turbulent eddies are less, and energy loss and fluid resistance are less.

In other embodiments, since the desorption system includes the pressure detector 10, accordingly, when the canister 18 is in the desorption mode, the on-off state of the steam electronic control valve 16 can be further controlled according to the air pressure in the fuel tank 1 detected by the pressure detector 10.

Specifically, the air pressure in the fuel tank 1 includes a first section, a second section, and a third section, the air pressure in the third section is greater than the air pressure in the second section, and the air pressure in the second section is greater than the air pressure in the first section. That is, the air pressures in the first section, the second section, and the third section are sequentially increased. The pressure value in the first interval can be less than-5 kPa, the pressure value in the second interval can be from-5 kPa to 5kPa, and the pressure value in the third interval can be more than 5 kPa. In addition, the air pressure values of the first interval, the second interval and the third interval can be designed according to the specific situation of the desorption system.

As shown in fig. 4, when the gas pressure of the fuel tank 1 is in the first interval, the fuel tank 1 is at risk of being crushed. Thus, the vapor electronically controlled valve 16 can be in an open state to draw atmospheric air into the fuel tank 1 to pressure compensate the fuel tank 1. In some cases, the opening degree of the steam electric control valve 16 can be gradually increased until the allowable working pressure of the fuel tank 1 is compensated; in other examples, the steam electronic control valve 16 may also be maintained at a fixed opening level, which may be maintained in a partially open state or a fully open state. If the steam electric control valve 16 is switched to the fully open state, the allowable working pressure of the fuel tank 1 cannot be compensated, and the desorption of the carbon canister 18 can also be stopped, so that the atmosphere entering from the atmosphere port 183 is completely used for compensating the pressure of the fuel tank 1 and does not participate in the desorption process.

The dashed arrows in fig. 4 indicate the flow direction of the atmosphere, and the bold straight arrows indicate the flow direction of the mixture of fuel vapor and the atmosphere, i.e., a portion of the atmosphere that can be used to compensate the pressure in the fuel tank 1 and a portion of the atmosphere that can participate in the desorption process of the canister 18.

As shown in fig. 3, the vapor electronic control valve 16 is in a fully closed state when the air pressure of the fuel tank 1 is in the second interval. Since the fuel tank 1 is now in the permitted operating pressure range, and there is no risk of this, the electrically controlled vapor valve 16 can be completely closed to prevent fuel vapor from entering the canister 18 and thus affecting the desorption process of the canister 18.

As shown in fig. 5, when the air pressure of the fuel tank 1 is in the third interval, the fuel tank 1 is at risk of expansion deformation, and therefore, the vapor electronic control valve 16 may be in an open state to release fuel vapor, thereby reducing the air pressure in the fuel tank 1. In some examples, the opening degree of the steam electric control valve 16 can be gradually increased until the allowable working pressure of the fuel tank 1 is released; in other examples, the steam electronic control valve 16 may also be maintained at a fixed opening level, which may be maintained in a partially open state or a fully open state. If the steam electronic control valve 16 is switched to the fully open state, the allowable working pressure of the fuel tank 1 cannot be released, and the canister 18 can be stopped from being desorbed, so that excessive fuel steam can be prevented from flowing into the engine 23, and the work of the engine 23 can be prevented from being influenced.

The thin solid arrows in fig. 5 represent the flow direction of fuel vapor, and the thick solid arrows represent the flow direction of the mixture gas of fuel vapor and atmospheric air; the dashed arrows represent the direction of flow of fresh atmosphere. That is, atmospheric air enters the canister 18 from the atmospheric port 183 to flush the carbon powder, and vapor from the fuel tank 1 also enters the canister 18.

As can be seen from fig. 3-5, when the canister 18 is in the desorption mode, the steam electronic control valve 16 can be switched according to the mode and the detection result of the pressure detector 10. It is worth mentioning that the desorption mode of the canister 18 is related to the operating condition of the engine 23, and when the engine 23 provides negative pressure, the canister 18 can be made to suck the atmosphere from the outside to perform desorption. Accordingly, the electronic control unit 13 may determine the operating mode of the canister 18 according to the operating conditions of the engine 23, and thereafter, determine the open and close states of the steam electronic control valve 16 and the canister electronic control valve 21 according to the operating mode of the canister 18.

In summary, the steam electronic control valve 16 can be closed when the canister 18 is desorbed, so as to prevent fuel steam in the fuel tank 1 from being sucked into the canister 18, so that the canister 18 is not reloaded with oil gas, and the regeneration efficiency of the canister 18 is improved. So, can promote 18 desorption volumes of canister, satisfy strict emission regulations, can also solve the vibration noise problem of refueling stop valve.

Furthermore, the steam electronic control valve 16 can also be controlled by the electronic control unit 13, which is more precisely controlled than by mechanical control.

In addition, because the steam electronic control valve 16 can be closed only during desorption of the carbon canister 18, the steam electronic control valve can be opened during other processes, such as refueling. Therefore, the desorption system has the function of refueling and exhausting and recycling, has small exhaust resistance and can meet the emission requirement of the sixth stage of the country.

Example two

The present embodiment provides a vehicle including: a vehicle body (not shown), such as the desorption system according to the first embodiment, which is located in the vehicle body. For the same or similar parts of this embodiment, please refer to the detailed description of the previous embodiment, which is not repeated herein.

The vehicle can be a traditional energy vehicle type and can also be a hybrid vehicle type. The vehicle may be a home car, a freight car or a passenger car, etc.

Because the desorption system of this vehicle can reduce the air current that flows into the charcoal jar in the fuel tank when the charcoal jar desorption to charcoal jar operating capability has been improved, consequently, the holistic emission of vehicle reduces. In addition, because the desorption amount of the carbon canister is large, more fuel steam can be stored continuously after the carbon canister is desorbed, and the adsorption requirement is not required to be met by increasing the number of carbon rods. Therefore, the method is beneficial to reducing the product cost and improving the product competitiveness.

In the description herein, references to the description of the terms "some embodiments," "exemplary," etc. mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or exemplary is included in at least one embodiment or exemplary of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present disclosure have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure, and therefore all changes and modifications that are intended to be covered by the claims and the specification of this disclosure are within the scope of the patent disclosure.

Claims (12)

1. A desorption system, comprising:

the carbon tank is provided with a desorption mode and a non-desorption mode and is provided with an adsorption port, a desorption port and an atmosphere port, and the atmosphere port can enable outside atmosphere to be sucked into the carbon tank when the carbon tank is in the desorption mode;

the fuel tank is connected with the adsorption port through a first pipeline, the first pipeline is provided with a steam electric control valve, and the steam electric control valve can be opened or closed according to the mode of the carbon canister.

2. The desorption system of claim 1 wherein the electrically controlled valve is configured to be closed when the canister is in the desorption mode and further configured to be open when the canister is in the non-desorption mode.

3. The desorption system of claim 1, further comprising: the pressure detector is connected with the fuel tank and is used for detecting the air pressure in the fuel tank;

the opening degree of the steam electric control valve can be adjusted and is in communication connection with the pressure detector; when the carbon canister is in a desorption mode, the steam electric control valve is used for adjusting or switching to a closing state under different opening degrees according to the air pressure detected by the pressure detector.

4. The desorption system of claim 3 wherein the gas pressure within the fuel tank includes a first interval, a second interval and a third interval, the third interval being greater than the second interval, the second interval being greater than the first interval;

when the air pressure of the fuel tank is in a first interval, the opening degree of the steam electric control valve is gradually increased;

the steam electric control valve is switched to a closed state when the air pressure of the fuel tank is in a second interval;

and when the air pressure of the fuel tank is in a third interval, the opening degree of the steam electric control valve is gradually increased.

5. The desorption system of claim 1, further comprising: the engine, through the second pipeline with the desorption mouth links to each other, the second pipeline is equipped with the charcoal jar electric control valve, the charcoal jar electric control valve can be according to the mode of charcoal jar is opened or is closed.

6. The desorption system of claim 5 wherein the canister electrical valve is configured to be opened when the canister is in the desorption mode and further configured to be closed when the canister is in the non-desorption mode.

7. The desorption system of claim 5 wherein the electrically controlled steam valve is a normally open solenoid valve; and/or the presence of a gas in the gas,

the carbon canister electric control valve is a normally closed electromagnetic valve.

8. The desorption system of claim 5, further comprising: and the electronic control unit is in communication connection with the carbon tank electric control valve and the steam electric control valve and is used for controlling the on-off states of the carbon tank electric control valve and the steam electric control valve when the carbon tank is in an desorption mode and a non-desorption mode.

9. The desorption system of claim 1, further comprising: the liquid accumulator is connected between the fuel tank and the first pipeline, a containing cavity and a baffle are arranged in the liquid accumulator, the baffle is used for blocking the fuel overflowing from the fuel tank to flow to the carbon canister, and the containing cavity is used for collecting the fuel overflowing from the fuel tank.

10. The desorption system of claim 1, further comprising: the leakage diagnosis module is connected with the atmosphere port and used for detecting whether fuel steam leaks from the atmosphere port; and/or the presence of a gas in the gas,

the desorption system further comprises: and the filter is connected with the atmosphere port and is used for filtering the gas discharged from the atmosphere port.

11. The desorption system of claim 1 wherein the fuel tank includes a filler pipe, a tank body, and a circulation pipe, the filler pipe being connected to the tank body, the circulation pipe having one end connected to the filler pipe and the other end connected to the tank body;

the box body is connected with the adsorption port through the first pipeline.

12. A vehicle, characterized by comprising:

a vehicle body, and a desorption system as claimed in any one of claims 1-11;

the desorption system is located in the vehicle body.

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