Vehicles, charcoal canister devices, and charcoal canister device control methods

Abstract

This invention provides a vehicle, a charcoal canister device, and a control method for the charcoal canister device. The charcoal canister device includes a charcoal canister with an air inlet, an adsorption port, and a desorption port. The adsorption port is connected to the fuel tank, and the desorption port is connected to the engine. A solenoid valve is disposed inside the charcoal canister. When energized, the solenoid valve generates heat to heat the medium inside the charcoal canister. A sealing element is connected to the solenoid valve, and the solenoid valve drives the sealing element to open or close the adsorption port. By placing the solenoid valve inside the charcoal canister, the solenoid valve heats up when energized, thereby improving the desorption effect of the charcoal canister. Moreover, the sealing element can move under the drive of the solenoid valve, thereby opening or closing the adsorption port accordingly, thus controlling the connection and disconnection between the fuel tank and the charcoal canister. This application integrates the heating to improve the adsorption effect and the shut-off of the fuel tank into the same solenoid valve for control, improving the spatial compactness of the charcoal canister device and making the overall structure of the charcoal canister device simpler.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and mainly to a vehicle, a charcoal canister device, and a control method for the charcoal canister device. Background Technology

[0002] To meet evaporative emission regulations and reduce pollution and waste caused by the release of fuel vapors from the fuel tank into the atmosphere, existing fuel systems use charcoal canisters to adsorb vapors generated in the tank. The desorption process in the charcoal canister is endothermic; providing more heat to the molecules in the charcoal during desorption results in cleaner desorption. Currently, vapor desorption in the charcoal canister is achieved by adding a heating device. However, these devices are generally large, requiring additional space and increasing costs. Furthermore, an electronic or mechanical valve needs to be added between the charcoal canister and the fuel tank to close during desorption, reducing negative pressure from the fuel tank and allowing more desorption air to flow into the charcoal canister. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a vehicle, a charcoal canister device and a charcoal canister device control method, wherein the charcoal canister device can control the gas flow direction during desorption and has a heating effect, making the charcoal canister easier to desorb cleanly, and its arrangement is more compact with fewer external parts.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] One aspect of this application provides a charcoal canister device, comprising a charcoal canister with an air inlet, an adsorption port, and a desorption port. The adsorption port is used to communicate with a fuel tank, and the desorption port is used to communicate with an engine. A solenoid valve is disposed inside the charcoal canister, and the solenoid valve can generate heat when energized to heat the medium inside the charcoal canister. A sealing element is connected to the solenoid valve, and the solenoid valve can drive the sealing element to move, causing the sealing element to open or close the adsorption port.

[0006] In this application, the charcoal canister is provided with an air inlet for communication with the outside environment, an adsorption port for communication with the fuel tank, and a desorption port for communication with the engine. The air inlet connects the charcoal canister to the atmosphere, the adsorption port connects the charcoal canister to the fuel tank, and the desorption port connects to the engine. The charcoal canister contains a medium for adsorbing fuel vapor from the fuel tank. A solenoid valve is installed inside the charcoal canister; when energized, the valve generates heat, improving the fuel vapor desorption effect within the charcoal canister. Furthermore, the seal is connected to the solenoid valve, and the seal can move under the drive of the solenoid valve, thereby opening or closing the adsorption port accordingly. When the adsorption port is open, fuel vapor in the fuel tank can enter the charcoal canister through the adsorption port, preventing excessive pressure in the fuel tank. When the adsorption port is closed, the connection between the fuel tank and the charcoal canister is disconnected, thereby increasing the amount of air entering the charcoal canister through the air intake during the engine's adsorption process, making it easier for the charcoal to be desorbed cleanly, further improving the desorption effect. At the same time, the seal, under the control of the solenoid valve, opens or closes the adsorption port, which also functions as a fuel tank shut-off valve. This charcoal canister device integrates heating to improve the adsorption effect and connecting and closing the fuel tank into a single solenoid valve for control. The design of placing the solenoid valve inside the charcoal canister avoids the need for a separate heating device, improving the compactness of the charcoal canister device's spatial layout, making the overall structure of the charcoal canister device simpler, and saving costs.

[0007] According to one technical solution of this application, it further includes an outer cover, which is disposed on the carbon canister. A first cavity is formed inside the outer cover. The adsorption port and a portion of the sealing member extend into the first cavity. The sealing member can move within the first cavity under the drive of the solenoid valve. The movement of the sealing member includes a first position and a third position. When the sealing member is in the first position, the sealing member separates from the adsorption port, causing the adsorption port to open. When the sealing member is in the third position, the sealing member seals the adsorption port.

[0008] In this design, when the seal is in the first position, it connects the fuel tank and the charcoal canister, allowing fuel vapor in the fuel tank to enter the charcoal canister through the adsorption port for adsorption and storage. When the seal is in the third position, it disconnects the fuel tank and the charcoal canister, which is beneficial for drawing air mainly from the air intake port when the engine is drawing air into the charcoal canister, thus improving the desorption of fuel vapor in the charcoal canister more thoroughly.

[0009] According to one technical solution of this application, a second cavity is further formed inside the outer cover, and a communication port is provided between the first cavity and the second cavity. The second cavity is used to communicate with the oil tank, and the movement of the sealing member also includes a second position.

[0010] When the seal is in the first position, the seal separates from the adsorption port, causing the adsorption port to open, and the seal blocks the communication port;

[0011] When the seal is in the second position, the seal is separated from both the adsorption port and the communication port, so that the adsorption port and the communication port are open.

[0012] When the seal is in the third position, the seal seals the adsorption port, and the seal separates from the communication port, causing the communication port to open.

[0013] In this solution, by providing a connecting port between the first cavity and the second cavity, the sealing element can cut off the connection between the oil tank and the carbon canister by sealing either the connecting port or the adsorption port.

[0014] According to one technical solution of this application, it also includes a control device and a power supply device, wherein the control device and the power supply device are electrically connected to the solenoid valve respectively.

[0015] When the control device controls the power supply device to supply a first current to the solenoid valve, the solenoid valve can drive the seal to the third position based on the first current, so that the seal closes the suction port and the communication port opens;

[0016] When the control device controls the power supply device to supply a second current to the solenoid valve, the solenoid valve can drive the seal to the second position based on the second current, so that both the suction port and the communication port are opened.

[0017] When the control device de-energizes the solenoid valve, the seal returns to the first position, causing the adsorption port to open and the communication port to close.

[0018] In this solution, the solenoid valve is energized by a control device and a power supply device to switch between the aforementioned three positions, so that the solenoid valve can control the sealing element to be in different positions according to the energization status, thereby controlling the gas flow direction in the carbon canister.

[0019] According to one technical solution of this application, the outer cover includes a cover body, a first partition, and a second partition. The cover body is disposed on the charcoal canister, covering the desorption port and the adsorption port. The second partition is disposed within the cover body to divide the space within the cover body into a first chamber and a second chamber. The adsorption port extends into the first chamber. The first partition divides the first chamber into a first cavity and a second cavity. The cover body is provided with a first connecting portion communicating with the second cavity and a second connecting portion communicating with the second cavity. The first connecting portion is used to connect to the fuel tank, and the second connecting portion is used to connect to the engine. The first partition has the communicating port. When the sealing member is in the first position, the sealing member abuts against the first partition and blocks the communicating port, thereby closing the communicating port. When the sealing member is in the second or third position, the sealing member separates from the first partition.

[0020] In this scheme, the first chamber is divided into a first cavity and a second cavity by setting a first partition, and the second partition is provided with a connecting port to connect the first cavity and the second cavity. The sealing element moves in the first cavity. Correspondingly, the sealing element moves to the first position, the second position and the third position to play the role of cutting off or connecting the oil tank and the carbon canister. This is beneficial to control the gas flow direction during the desorption process.

[0021] According to one technical solution of this application, the first connecting part is a quick-connect connector.

[0022] According to one technical solution of this application, the second connecting part is a quick-connect coupling. The quick-connect coupling enables rapid connection between the fuel tank and the charcoal canister, as well as between the engine and the charcoal canister; it has a simple structure and is easy to install.

[0023] According to one technical solution of this application, the sealing element includes a connecting rod and a blocking part. One end of the connecting rod is connected to the solenoid valve, and the other end of the connecting rod is connected to the blocking part. Under the drive of the solenoid valve, the connecting rod drives the blocking part to open or close the suction port. In this way, the solenoid valve directly drives the connecting rod to move, thereby moving the blocking part to different positions. This transmission structure is simple and reliable.

[0024] According to one technical solution of this application, the shielding part is located outside the carbon canister, the connecting rod passes through the adsorption port, one end of the connecting rod extends into the carbon canister and is connected to the solenoid valve, and the other end of the connecting rod extends out of the carbon canister and is connected to the shielding part.

[0025] According to one technical solution of this application, the connecting rod and the blocking part are connected by a snap-fit ​​connection, wherein one of the connecting rod and the blocking part is provided with a limiting groove, and the other of the connecting rod and the blocking part is provided with a protrusion, and the protrusion is snap-fitted with the limiting groove.

[0026] According to one technical solution of this application, a sealing gasket is further included. The sealing gasket is nested on the outside of the blocking part. When the blocking part covers the adsorption port, the sealing gasket abuts against the wall of the adsorption port and the blocking part. By providing a sealing gasket on the outside of the blocking part, when the blocking part moves to the position of blocking the adsorption port, the sealing gasket can seal the gap between the wall of the adsorption port and the blocking part, thereby improving the sealing performance of the oil tank when the adsorption port is blocked.

[0027] According to one technical solution of this application, a clamping member is also included. The clamping member is located inside the charcoal canister. A first end of the clamping member is connected to the inner surface of the charcoal canister, and a second end of the clamping member is protruding relative to the inner surface of the charcoal canister. The second end of the clamping member is provided with a clamping portion to clamp the solenoid valve. This facilitates positioning the solenoid valve away from the inner surface of the charcoal canister, allowing the medium inside the charcoal canister to be heated more evenly, and preventing the solenoid valve from directly contacting the inner surface of the charcoal canister and causing excessive heating of the charcoal canister.

[0028] According to one technical solution of this application, a third partition is further included. The third partition is disposed inside the carbon canister and divides the space inside the carbon canister into a third cavity and a fourth cavity. The third cavity and the fourth cavity are in communication. The air inlet is disposed on the side of the carbon canister corresponding to the third cavity, and the adsorption port and desorption port are disposed on the side of the carbon canister corresponding to the fourth cavity. The solenoid valve is located in the fourth cavity. The third partition divides the interior of the carbon canister into a cavity communicating with the atmosphere and a cavity for adsorption and desorption.

[0029] This application provides a vehicle comprising a vehicle body and a charcoal canister device as described in any of the above embodiments, wherein the charcoal canister device is connected to the vehicle body.

[0030] This application proposes a control method for a charcoal canister device in three aspects, used to control the charcoal canister device described in any of the above embodiments. The control method for the charcoal canister device includes:

[0031] Detect the current status of the engine;

[0032] If the engine is currently in a desorbed state, obtain the fuel tank working pressure information;

[0033] When the working pressure of the oil tank is less than or equal to the negative pressure threshold, a first current is supplied to the solenoid valve, causing the solenoid valve to drive the seal to close the adsorption port based on the first current;

[0034] When the working pressure of the oil tank is greater than or equal to the positive pressure threshold, the solenoid valve is de-energized, causing the solenoid valve to open the adsorption port accordingly; or when the working pressure of the oil tank is greater than or equal to the positive pressure threshold, a second current is supplied to the solenoid valve, causing the solenoid valve to drive the sealing element based on the second current to open both the adsorption port and the communication port of the outer cover.

[0035] In this solution, the charcoal canister device can adjust the energization state of the solenoid valve according to the working pressure of the oil tank, thereby regulating the oil tank when the working pressure is outside the normal operating range, and acting as a shut-off valve to protect the oil tank.

[0036] According to one technical solution of this application, when the working pressure of the oil tank is less than or equal to the negative pressure threshold, after a first current is supplied to the solenoid valve and maintained for a first set time, the control method of the charcoal canister device further includes:

[0037] Determine if the working pressure of the fuel tank is less than the negative pressure threshold;

[0038] If so, the solenoid valve is de-energized, and then a first current is supplied to the solenoid valve.

[0039] In this solution, if the working pressure of the oil tank continues to drop and falls below the negative pressure threshold, the protection system is prevented from failing by controlling the solenoid valve to re-energize.

[0040] According to one technical solution of this application, the control method of the charcoal canister device further includes:

[0041] Detect the fuel tank to begin refueling;

[0042] Based on the fuel tank start refueling command, a second current is supplied to the solenoid valve, causing the solenoid valve to drive the sealing element to open both the suction port and the communication port of the outer cover based on the second current;

[0043] Until a refueling end command is received from the fuel tank or the second current is supplied to the solenoid valve for a second set duration, the solenoid valve is de-energized, causing it to close the connection port.

[0044] In this solution, the charcoal canister device is applied to hybrid electric vehicles. When the hybrid electric vehicle needs to refuel, in order to allow the fuel tank to vent to the outside and thus achieve smooth refueling, a second current is supplied to the solenoid valve, causing the seal to descend between the adsorption port and the connection port of the outer cover, and the fuel tank is connected to the outside through the charcoal canister. Attached Figure Description

[0045] Figure 1 This is a perspective view of a charcoal canister device according to an embodiment of this application;

[0046] Figure 2This is an exploded view of a charcoal canister device according to an embodiment of this application;

[0047] Figure 3 This is a cross-sectional view of a charcoal canister device according to an embodiment of this application;

[0048] Figure 4 This is a cross-sectional view of the outer cover according to an embodiment of this application;

[0049] Figure 5 This is an exploded view of a solenoid valve and a seal according to an embodiment of this application;

[0050] Figure 6 This is one of the schematic diagrams showing the seal in a first position according to an embodiment of this application;

[0051] Figure 7 This is a second schematic diagram showing the seal in a first position according to an embodiment of this application;

[0052] Figure 8 This is one of the schematic diagrams showing the seal in a third position according to an embodiment of this application;

[0053] Figure 9 This is a second schematic diagram showing the seal in a third position according to an embodiment of this application;

[0054] Figure 10 This is a schematic diagram of the seal in a second position according to an embodiment of this application;

[0055] Figure 11 This is a schematic diagram of a control method for a charcoal canister device according to an embodiment of this application;

[0056] Figure 12 This is a schematic diagram of a control method for a charcoal canister device according to an embodiment of this application during refueling.

[0057] The correspondence between the reference numerals and the component names is as follows:

[0058] 1. Carbon canister; 101. Adsorption port; 102. Desorption port; 103. Third chamber; 104. Fourth chamber;

[0059] 2. Solenoid valves;

[0060] 3. Seal, 301. Slot, 31. Connecting rod, 32. Cover, 33. Protrusion, 34. Sealing gasket;

[0061] 4. Outer cover; 401. First cavity; 402. Second cavity; 403. Connecting port; 404. Second chamber; 41. Cover; 42. First partition; 43. Second partition; 44. First connecting part; 45. Second connecting part;

[0062] 5 clamping components;

[0063] 6. Third partition. Detailed Implementation

[0064] This invention provides a vehicle, a charcoal canister device, and a control method for the charcoal canister device. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the scope of protection of the invention.

[0065] In the description of this invention, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0066] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] To meet evaporative emission regulations and reduce pollution and waste caused by vapors generated from heated fuel in the fuel tank escaping into the atmosphere, existing fuel systems use charcoal canisters to adsorb these vapors. The desorption process in the charcoal canister is endothermic; it can be considered as the adsorbed molecules absorbing heat from the environment, their thermal motion intensifying, and then detaching from the charcoal powder due to van der Waals forces. Providing more heat to the molecules in the charcoal canister during desorption can result in cleaner desorption. Currently, heating devices are also used, but these devices are generally large and expensive.

[0068] Furthermore, charcoal canister desorption primarily relies on the negative pressure generated by engine operation to draw air from the air inlet connecting the charcoal canister to the atmosphere. However, since the three connection ports of the charcoal canister are generally interconnected, vapor from the fuel tank is also drawn into the engine during engine negative pressure suction, effectively reducing the amount of air entering the charcoal canister through the atmosphere. Existing technology adds an electronically controlled valve or mechanical valve between the charcoal canister and the fuel tank, controlling its closure during desorption to reduce negative pressure suction from the fuel tank and allow more desorbed air to flow into the charcoal canister. However, this structure increases the overall size of the charcoal canister device, requiring additional space and resulting in higher costs.

[0069] Therefore, this application provides a charcoal canister device that integrates a heating device and a fuel tank shut-off valve onto the same solenoid valve. The heating effect of the solenoid valve is used to heat the charcoal canister device and control the connection between the charcoal canister and the fuel tank during desorption, thereby controlling the flow direction of the gas during desorption. This not only improves the desorption effect of fuel vapor in the charcoal canister, making the desorption and flushing of the charcoal canister more thorough, but also functions as a fuel tank shut-off valve.

[0070] Please refer to the appendix. Figures 1 to 10 This application provides a charcoal canister device, including a charcoal canister 1, a solenoid valve 2, and a seal 3.

[0071] The charcoal canister 1 of this application is provided with an air inlet, an adsorption port 101, and a desorption port 102. The adsorption port 101 is used to communicate with the fuel tank, and the desorption port 102 is used to communicate with the engine. Generally, the medium filled inside the charcoal canister 1 is used to adsorb fuel vapor, such as carbon powder particles made of fruit shells or other materials, which contain a large number of small pore structures. When the adsorbate passes through these carbon powder particles, it will be adsorbed into these pores by van der Waals forces. The air inlet is used to communicate with the atmosphere of the charcoal canister 1. When the engine draws air from the charcoal canister 1, outside air will enter the charcoal canister 1 through the air inlet and carry the fuel vapor adsorbed by the charcoal canister 1 into the engine for combustion. The adsorption port 101 connects the charcoal canister 1 and the fuel tank. The opening and closing of the adsorption port 101 realizes the connection and closure of the fuel tank and the charcoal canister 1. The desorption port 102 is used to communicate with the engine and deliver the gas in the charcoal canister 1 to the engine for combustion.

[0072] Furthermore, the solenoid valve 2 is installed inside the charcoal canister 1. When energized, the solenoid valve 2 can generate heat to heat the medium inside the charcoal canister 1. In this way, the solenoid valve 2 can act as a heating device to directly heat the medium inside the charcoal canister 1. On the one hand, this is conducive to cleaner desorption of fuel vapor in the charcoal canister 1 and achieve a better desorption effect. On the other hand, it can also save external space for the heating device, making the structure of the charcoal canister device more compact, occupying less space, and reducing costs.

[0073] For example, the valve body of solenoid valve 2 is made of metal, which is beneficial for transferring heat to the cavity of carbon canister 1.

[0074] The sealing element 3 is connected to the solenoid valve 2, which drives the sealing element 3 to open or close the adsorption port 101. Thus, under the control of the solenoid valve 2, the sealing element 3 opens the adsorption port 101, connecting the fuel tank and the charcoal canister 1, allowing fuel vapors volatilized in the fuel tank to directly enter the charcoal canister 1. Similarly, under the control of the solenoid valve 2, the sealing element 3 closes the adsorption port 101, disconnecting the fuel tank from the charcoal canister 1. This prevents the simultaneous extraction of fuel vapors from the fuel tank during desorption. The reduced atmospheric air intake at the air inlet hinders the desorption of fuel vapors from the medium in the charcoal canister 1, effectively functioning as a fuel tank shut-off valve.

[0075] The structure of the charcoal canister device disclosed in this application improves the desorption effect of the charcoal canister 1 by directly placing the solenoid valve 2 inside the charcoal canister device and using its heating effect when energized. It also simplifies the structure of the heating device and effectively reduces the overall volume of the device. At the same time, the solenoid valve 2 controls the movement of the sealing element 3 to open or close the adsorption port 101, realizing the function of the fuel tank shut-off valve. This further controls the gas flow direction inside the charcoal canister device during desorption, making the desorption of fuel vapor by the charcoal canister 1 more thorough and increasing the integration of the charcoal canister device.

[0076] In some embodiments, the charcoal canister device further includes an outer cover 4, which is disposed on the charcoal canister 1. A first cavity 401 is formed inside the outer cover 4. The adsorption port 101 and a portion of the sealing member 3 extend into the first cavity 401. The sealing member 3 can move within the first cavity 401 under the drive of the solenoid valve 2. The movement of the sealing member 3 includes a first position and a third position. Figure 6 As shown, when the seal 3 is in the first position, the seal 3 separates from the adsorption port 101, causing the adsorption port 101 to open. At this time, the fuel tank and the charcoal canister are connected, allowing fuel vapor in the fuel tank to enter the charcoal canister 1 through the adsorption port 101 for adsorption and storage; Figure 8 As shown, when the seal 3 is in the third position, the seal 3 seals the adsorption port 101. At this time, the connection between the fuel tank and the charcoal canister 1 is disconnected. This is beneficial for the engine to draw air in mainly from the air intake when it is drawing air into the charcoal canister 1, thereby improving the desorption of fuel vapor in the charcoal canister 1 more thoroughly and preventing the charcoal canister 1 from accumulating too much fuel vapor, which would affect the adsorption effect on the fuel tank.

[0077] To give a more detailed example, when this charcoal canister device is applied to a gasoline vehicle, the solenoid valve control seal is separated from the adsorption port as a normal state, keeping the fuel tank open to the outside. In this way, the charcoal canister device can adsorb fuel vapor from the fuel tank under normal conditions, preventing excessively high fuel pressure in the fuel tank from causing fuel vapor to be released into the air or causing fuel tank safety issues.

[0078] like Figure 3 and 4As shown, in some embodiments, a second cavity 402 is also formed inside the outer cover 4. A communication port 403 is provided between the first cavity 401 and the second cavity 402. The second cavity 402 is used to communicate with the oil tank. The movement of the seal 3 also includes a second position; when the seal 3 is in the first position, the seal 3 separates from the adsorption port 101, causing the adsorption port 101 to open, and the seal 3 blocks the communication port 403, so that the charcoal canister 1 and the oil tank are disconnected. Figure 10 As shown, when the seal 3 is in the second position, the seal 3 is separated from both the adsorption port 101 and the connecting port 403, causing the adsorption port 101 to open and the connecting port 403 to open. At this time, the oil tank and the charcoal canister 1 are connected. When the seal 3 is in the third position, the seal 3 seals the adsorption port 101, and the seal 3 is separated from the connecting port 403, causing the connecting port 403 to open. At this time, the charcoal canister 1 and the oil tank are disconnected.

[0079] In detail, the charcoal canister device in this embodiment is suitable for use in plug-in hybrid electric vehicles. Typically, these vehicles use high-pressure fuel tanks. The solenoid valve 2 controls the seal 3 to be in its first position, which is the normal state, thus sealing the high-pressure fuel tank. When it is necessary to desorb fuel vapor from the charcoal canister 1 for engine combustion, the solenoid valve 2 controls the seal 3 to move to the third position. At this time, the heating effect of the solenoid valve 2 transfers heat to the charcoal canister 1, improving the desorption effect. When it is necessary to refuel, the solenoid valve 2 controls the seal 3 to move to the second position. At this time, the solenoid valve 2 simultaneously opens the connecting port 403 and the adsorption port 101, connecting the fuel tank and the charcoal canister 1, allowing the fuel tank to vent, which facilitates smooth refueling. Thus, by controlling the seal 3 to switch between different positions via the solenoid valve 2, not only is the desorption efficiency of the heating device on the charcoal canister 1 improved, but it also provides an FTIV (Fuel Tank Isolation Valve) sealing function.

[0080] Furthermore, the charcoal canister device also includes a control device and a power supply device that are electrically connected to the solenoid valve 2. When the control device controls the power supply device to supply a first current to the solenoid valve 2, the solenoid valve 2 can drive the sealing member 3 to a third position based on the first current, so that the sealing member 3 closes the adsorption port 101 and the connecting port 403 opens. When the control device controls the power supply device to supply a second current to the solenoid valve 2, the solenoid valve 2 can drive the sealing member 3 to a second position based on the second current, so that both the adsorption port 101 and the connecting port 403 open. When the control device controls the solenoid valve 2 to be de-energized, the sealing member 3 resets to the first position, so that the adsorption port 101 opens and the connecting port 403 closes.

[0081] More specifically, this type of charcoal canister device is used in plug-in hybrid electric vehicles, where the control unit de-energizes solenoid valve 2 as a normal state, such as... Figure 7As shown, at this time, the seal 3 is in the first position, the connection port 403 is closed, and the connection between the fuel tank and the charcoal canister 1 is disconnected, preventing the high-pressure fuel tank from connecting with the charcoal canister 1; when it is necessary to desorb the fuel vapor adsorbed in the charcoal canister 1 and clean the charcoal canister 1, the control device controls the power supply device to supply a first current to the solenoid valve 2. It can be understood that the first current at this time is greater than the second current, such as... Figure 9 As shown, the first current flowing through the solenoid valve 2 drives the seal 3 to the third position. The large current makes the heating effect of the solenoid valve 2 more pronounced, thus improving the fuel vapor desorption effect of the charcoal canister device and preventing the engine from drawing in fuel tank vapor, which would reduce the desorption effect of the charcoal canister 1. When it is necessary to add fuel to the high-pressure fuel tank, the control device can control the power supply to flow a second current to the solenoid valve 2, such as... Figure 10 As shown, the solenoid valve 2 drives the sealing element 3 to move to the second position, and both the adsorption port 101 and the connecting port 403 are opened, so that the fuel tank is connected to the atmosphere through the carbon canister 1, which is conducive to a smoother fuel filling process. The small current is introduced to prevent the carbon canister 1 from overheating and to prevent the carbon powder in the carbon canister 1 from having a poor adsorption effect on fuel vapor.

[0082] To give a more detailed example, the energization of solenoid valve 2 can be controlled according to the working pressure inside the fuel tank. For instance, when the pressure inside the fuel tank is below the negative pressure threshold, a first current is supplied to solenoid valve 2 to close the adsorption port 101 of the seal 3, disconnecting the connection between the fuel tank and the charcoal canister 1, thus preventing excessive suction of the fuel tank. When the pressure inside the fuel tank is above the positive pressure threshold, a second current is supplied to solenoid valve 2 to connect the charcoal canister 1 and the fuel tank. The fuel vapor in the fuel tank is then adsorbed by the charcoal canister 1. At this time, the current intensity of the second current is lower than that of the first current, and the current intensity is controlled at a small level to avoid the solenoid valve 2 heating the charcoal canister 1 to a high degree, which would affect the adsorption effect of the charcoal canister 1 on the fuel vapor. It can also prevent the pressure inside the fuel tank from being too high and causing safety problems. This device controls the energization of solenoid valve 2 based on the working pressure inside the oil tank, and can also simultaneously perform the function of an FTIV valve, which is an oil tank isolation valve. Once the pressure inside the oil tank exceeds a preset threshold, it can adjust the excessively high or low pressure to achieve the function of oil tank protection.

[0083] like Figure 4 , Figure 7 , Figure 9 and Figure 10As shown, in some embodiments, the outer cover 4 includes a cover body 41, a first partition 42, and a second partition 43. The cover body 41 is disposed on the charcoal canister 1, covering the desorption port 102 and the adsorption port 101. The second partition 43 is disposed inside the cover body 41 to divide the space inside the cover body 41 into a first chamber and a second chamber 404. The adsorption port 101 extends into the first chamber. The first partition 42 divides the first chamber into a first cavity 401 and a second cavity 402. The cover body 41 is provided with a first connecting part 44 communicating with the second cavity 402 and a second connecting part 45 communicating with the second cavity 404. The first connecting part 44 is used to connect to the fuel tank, and the second connecting part 45 is used to connect to the engine. In this way, the fuel tank and the engine are connected respectively through the first connecting part 44 and the second connecting part 45 provided on the cover body 41, making the connection structure of the charcoal canister 1 more compact and convenient to connect.

[0084] Furthermore, the first partition 42 is provided with a connecting port 403. When the sealing member 3 is in the first position, the sealing member 3 abuts against the first partition 42 and blocks the connecting port 403, thereby closing the connecting port 403. When the sealing member 3 is in the second or third position, the sealing member 3 separates from the first partition 42. More specifically, the connecting port 403 of the partition is arranged opposite to the adsorption port 101. In this way, under the action of the solenoid valve 2, the sealing member 3 can move between the adsorption port 101 and the connecting port 403, thereby achieving the opening and closing of the oil tank and the charcoal canister 1 by blocking the connecting port 403 or the adsorption port 101, or other positions.

[0085] In some embodiments, the first connecting part 44 is a quick-connect connector, the second connecting part 45 is a quick-connect connector, and the outer cover 4 serves as a connecting component between the charcoal canister and the fuel tank or engine, making the overall structure of the charcoal canister more reasonable and the product assembly relatively more convenient.

[0086] like Figure 2 and 5 As shown, in some embodiments, the sealing element 3 includes a connecting rod 31 and a blocking part 32. One end of the connecting rod 31 is connected to the solenoid valve 2, and the other end of the connecting rod 31 is connected to the blocking part 32. Under the drive of the solenoid valve 2, the connecting rod 31 drives the blocking part 32 to open or close the adsorption port 101. In this way, the solenoid valve 2 drives the connecting rod 31 to move, which can synchronously drive the blocking part 32 to move relative to the adsorption port 101. When the blocking part 32 moves to the adsorption port 101, it blocks the adsorption port 101 and disconnects the connection between the oil tank and the charcoal canister 1.

[0087] In other optional embodiments, a reset structure is provided at the connection between the solenoid valve 2 and the push rod. The reset structure can be an elastic element, etc., so that when the solenoid valve 2 is de-energized, the push rod can be reset to the normal position. For example, when the solenoid valve 2 is de-energized, it resets from the position blocking the adsorption port 101 to the position separated from the adsorption port 101, thereby realizing the disconnection of the oil tank and the charcoal canister 1.

[0088] More in detail, such as Figure 3 and Figure 5 As shown, the shielding part 32 is located outside the carbon canister 1, and the connecting rod 31 passes through the adsorption port 101. One end of the connecting rod 31 extends into the carbon canister 1 and is connected to the solenoid valve 2, while the other end of the connecting rod 31 extends out of the carbon canister 1 and is connected to the shielding part 32. In this way, the extension and retraction of the connecting rod 31 driven by the solenoid valve 2 can drive the shielding part 32 to move relative to the adsorption port 101. This transmission structure is simple.

[0089] Furthermore, the connecting rod 31 and the blocking part 32 are connected by a snap-fit ​​connection. One of the connecting rod 31 and the blocking part 32 has a limiting groove 301, and the other has a protrusion 33, which engages with the limiting groove 301. In this way, the connecting rod 31 and the blocking part 32 are fixed together by a snap-fit ​​connection. This connection structure facilitates the installation of the blocking plate on the outside of the suction port 101.

[0090] Of course, this design is not limited to this. In other embodiments, the sealing element 3 can be a component with a threaded structure, and the adsorption port 101 or the connecting port 403 is correspondingly provided with a threaded structure. The threaded end of the sealing element 3 is adapted to the adsorption port 101 and the connecting port 403. Under the drive of the solenoid valve 2, the sealing element 3 is connected to the adsorption port 101 through a threaded connection to close the adsorption port 101, or under the drive of the solenoid valve 2, the sealing element 3 is connected to the connecting port 403 through a threaded connection to close the connecting port 403.

[0091] like Figure 5 As shown, in some embodiments, a sealing gasket 34 is also included. The sealing gasket 34 is nested outside the shielding portion 32. When the shielding portion 32 covers the adsorption port 101, the sealing gasket 34 abuts against the wall of the adsorption port 101 and the shielding portion 32. In this way, the sealing gasket 34 can seal the gap between the wall of the adsorption port 101 and the shielding portion 32, thereby enhancing the shielding effect of the shielding portion 32 on the adsorption port 101 and improving the sealing performance of the oil tank when the adsorption port 101 is covered. More specifically, the sealing gasket 34 is made of an elastic material, such as elastic silicone, to improve its sealing effect.

[0092] like Figure 3As shown, in some embodiments, the charcoal canister device further includes a clamping member 5 located inside the charcoal canister 1. The first end of the clamping member 5 is connected to the inner surface of the charcoal canister 1, and the second end of the clamping member 5 is provided with a clamping portion to clamp the solenoid valve 2. This allows the solenoid valve 2 to be installed inside the charcoal canister 1. Moreover, the clamping member 5 protrudes from the connection point between the clamping member and the inner surface of the charcoal canister toward the cavity of the charcoal canister 1, and its protruding portion clamps the solenoid valve 2, thereby keeping the solenoid valve 2 away from the inner surface of the charcoal canister 1. This facilitates more uniform heating of the medium inside the charcoal canister cavity through the heating effect of the solenoid valve 2, and avoids the solenoid valve 2 directly contacting the inner surface of the charcoal canister, which would cause the charcoal canister 1 to overheat.

[0093] For example, the clamp 5 is configured as a claw to prevent the solenoid valve 2 from shifting. In addition, the clamp 5 can also be used to install non-woven fabric in the charcoal canister 1. The non-woven fabric is beneficial for separating the fuel vapor mixture flowing into the charcoal canister 1.

[0094] In some embodiments, the charcoal canister 1 further includes a third partition 6, which is disposed inside the charcoal canister 1 and divides the space inside the charcoal canister 1 into a third cavity 103 and a fourth cavity 104. The third cavity 103 and the fourth cavity 104 respectively contain carbon powder or other media for adsorbing fuel vapor. The third cavity 103 and the fourth cavity 104 are connected. The air inlet is disposed on the side of the charcoal canister 1 corresponding to the third cavity 103. In this way, the outside atmosphere first passes through the air inlet and the third cavity 103 and then enters the fourth cavity 104. The adsorption port 101 and the desorption port 102 are disposed on the side of the charcoal canister 1 corresponding to the fourth cavity 104. The solenoid valve 2 is located inside the fourth cavity 104. In this way, the third partition 6 divides the interior of the charcoal canister 1 into a cavity connected to the atmosphere and a cavity for adsorption and desorption.

[0095] The vehicle provided by the second aspect of this application includes a vehicle body and a charcoal canister device as described in any of the above embodiments. The charcoal canister device is connected to the vehicle body, thereby having all the above-described beneficial effects, which will not be repeated here.

[0096] like Figure 11 and 12 As shown, an embodiment of the third aspect of this application provides a control method for a charcoal canister device, used to control the charcoal canister device of any of the above embodiments. The charcoal canister device can be applied to a gasoline-powered vehicle, and the control method can be executed by the gasoline-powered vehicle. The control method includes at least steps S10 to S40, detailed below:

[0097] S10: Detect the current status of the engine.

[0098] S20: If the engine is currently in a desorbed state, obtain the fuel tank working pressure information;

[0099] S30: When the working pressure of the oil tank is less than or equal to the negative pressure threshold, the first current is supplied to the solenoid valve 2, so that the solenoid valve drives the sealing element 3 to close the adsorption port 101 based on the first current.

[0100] S40: When the working pressure of the oil tank is greater than or equal to the positive pressure threshold, the solenoid valve 2 is de-energized, so that the solenoid valve 2 opens the adsorption port 101 accordingly.

[0101] In this embodiment, the current state of the engine can be detected by collecting the opening signal of the desorption solenoid valve 2 from the EMS (Engine Management System), which is the engine controller. When the opening signal of the desorption solenoid valve 2 is greater than 0, the engine is in a desorbed state; when the opening signal of the desorption solenoid valve 2 is equal to 0, the engine is in a non-desorbed state. If the engine is currently in a desorbed state, the EMS will collect the working pressure of the fuel tank and adjust the energization of the solenoid valve 2 installed in the charcoal canister device according to the working pressure of the fuel tank, so that the solenoid valve 2 can isolate the fuel tank and protect it.

[0102] When the working pressure of the fuel tank is less than or equal to the negative pressure threshold, a first current is supplied to solenoid valve 2, causing solenoid valve 2 to drive seal 3 to close suction port 101 based on the first current. This control method prevents the engine from continuing to draw fuel from the fuel tank by cutting off the connection between the fuel tank and the charcoal canister device, thereby preventing the negative pressure in the fuel tank from continuing to drop and protecting the fuel tank. When the working pressure of the fuel tank is greater than or equal to the positive pressure threshold, solenoid valve 2 needs to be de-energized. This connects the fuel tank and the charcoal canister device to allow the fuel tank to ventilate to the outside, causing the working pressure in the fuel tank to drop and protecting the fuel tank.

[0103] It is understandable that, considering the aforementioned structure of the charcoal canister device, the solenoid valve 2 of the charcoal canister device applied to gasoline vehicles is a normally open valve. That is, when the solenoid valve 2 is not energized, please refer to the appendix. Figure 6 Solenoid valve 2 opens the adsorption port 101, thus maintaining the connection between the fuel tank and the charcoal canister 1. When the engine begins desorption, if the fuel tank operating pressure is within the normal range, a first current is supplied to solenoid valve 2. This causes solenoid valve 2 to drive the sealing element 3 to seal the adsorption port 101 based on the first current. Please refer to the attached diagram. Figure 8 At this point, the desorption no longer draws into the fuel tank, thereby increasing the amount of air entering. Moreover, the solenoid valve 2 heats up due to the current flowing through it, which heats the carbon powder inside the carbon canister 1, making it easier for the fuel vapor adsorbed inside the carbon canister 1 to desorb after being heated, effectively increasing the amount of fuel vapor desorbed from the carbon canister 1.

[0104] In one embodiment of this application, when the working pressure of the fuel tank is less than or equal to a negative pressure threshold, after a first current is supplied to the solenoid valve 2 for a first set duration, the control method for the charcoal canister device further includes: determining whether the working pressure of the fuel tank is less than the negative pressure threshold; if so, controlling the solenoid valve 2 to be de-energized, and then supplying the first current to the solenoid valve 2. After maintaining the solenoid valve 2 energized with the first current for a first set duration, if the pressure in the fuel tank is less than or equal to the negative pressure threshold and continues to decrease, this may be due to a fuel system blockage and lack of external connection caused by the superposition of multiple factors. In this case, it is necessary to disconnect the solenoid valve 2 and re-energize it to protect the fuel tank.

[0105] In other embodiments, the charcoal canister device can be applied to PHEV models, i.e., hybrid electric vehicles. The control method of the charcoal canister device includes at least steps S10 to S40, which are described in detail below:

[0106] S10: Detect the current status of the engine.

[0107] S20: If the engine is currently in a desorbed state, obtain the fuel tank working pressure information.

[0108] S30: When the working pressure of the oil tank is less than or equal to the negative pressure threshold, the first current is supplied to the solenoid valve 2, so that the solenoid valve 2 drives the seal 3 to close the adsorption port 101 based on the first current.

[0109] S40: When the working pressure of the oil tank is greater than or equal to the positive pressure threshold, a second current is supplied to the solenoid valve 2, so that the solenoid valve 2 drives the seal 3 to open both the adsorption port 101 and the communication port 403 of the outer cover 4 based on the second current.

[0110] In this embodiment, please refer to the attached diagram for the structure of the upper cover. Figure 4 The charcoal canister device has a first partition 42 on its upper cover, and a connecting port 403 on the first partition 42. The solenoid valve 2 inside the charcoal canister device can connect or disconnect the oil tank and the charcoal canister 1 according to the working pressure of the oil tank, thus functioning as an oil tank isolation valve. Specifically, when the working pressure of the oil tank is less than or equal to the negative pressure threshold, a first current is supplied through the solenoid valve 2. The state of the sealing element 3 at this time can be found in the appendix. Figure 9 Seal 3 closes the suction port 101, disconnecting the connection between the fuel tank and the charcoal canister 1, preventing the engine from drawing fuel from the tank. When the fuel tank working pressure is greater than or equal to the positive pressure threshold, a second current is supplied to the solenoid valve 2. The state of seal 3 at this time can be found in the appendix. Figure 10 Simultaneously, the sealing element 3 opens both the adsorption port 101 and the connecting port 403, connecting the oil tank to the charcoal canister 1 and promptly reducing the pressure inside the oil tank. The aforementioned adjustment of the solenoid valve 2's energization based on the oil tank's operating pressure serves to protect the oil tank.

[0111] It should be understood that, in conjunction with the aforementioned charcoal canister device structure, hybrid vehicles generally use high-pressure fuel tanks to meet regulatory requirements. The fuel tank is kept in a sealed state for extended periods. Correspondingly, the solenoid valve 2 of the charcoal canister device used in hybrid vehicles is a normally closed valve. That is, when the solenoid valve 2 is not energized, it disconnects the fuel tank from the charcoal canister 1, thereby maintaining the fuel tank's sealed state. The normal position of the solenoid valve 2 and the sealing element 3 is as follows: Figure 7 As shown. When the engine begins to desorb, if the fuel tank working pressure is within the normal range, a better desorption effect can be achieved by supplying a first current to solenoid valve 2.

[0112] Furthermore, to suit the use of hybrid vehicles, the control method for the charcoal canister device also includes:

[0113] S51: Detects fuel tank refueling command;

[0114] S52: Based on the fuel tank start refueling command, a second current is supplied to the solenoid valve 2, so that the solenoid valve 2 drives the seal 3 to open both the suction port 101 and the communication port 403 of the outer cover 4 based on the second current.

[0115] S53: Until the fuel tank finishes refueling or the second current is supplied to the solenoid valve 2 for a second set duration, the solenoid valve 2 is de-energized, causing the solenoid valve 2 to close the connection port 403.

[0116] In this embodiment, it should be noted that the current intensity of the first current is greater than that of the second current. When the hybrid vehicle needs refueling, in order to allow the fuel tank to vent to the outside and thus achieve smooth refueling, the second current is supplied to the solenoid valve 2, causing the seal 3 to descend between the suction port 101 and the communication port 403 of the outer cover 4. The state corresponding to this position can be referred to the aforementioned second position, and the attached... Figure 10 As shown, at this time, the fuel tank is connected to the outside through the carbon canister 1. Since the second current is not large, it will not heat the carbon canister 1 to the point of overheating, thus preventing the carbon powder from poorly adsorbing fuel vapor.

[0117] Please refer to the appendix. Figure 12 Furthermore, when a refueling end command is received, the solenoid valve 2 is de-energized. At this time, the seal 3 is reset to the position blocking the connection port 403, thereby sealing the fuel tank. In addition, a second preset time can be set as the refueling time. If no refueling end command is received, but the second preset time has been reached, the solenoid valve 2 is de-energized.

[0118] It is understood that those skilled in the art can make equivalent substitutions or changes to the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A charcoal canister device, characterized in that, include: A charcoal canister, which is provided with an air inlet, an adsorption inlet and a desorption inlet, wherein the adsorption inlet is used to communicate with the fuel tank and the desorption inlet is used to communicate with the engine; A solenoid valve is installed inside the charcoal canister. When energized, the solenoid valve generates heat to heat the medium inside the charcoal canister. A sealing element is connected to the solenoid valve, which can drive the sealing element to move, causing the sealing element to open or close the suction port. An outer cover is provided on the charcoal canister, and a first cavity is formed inside the outer cover. The adsorption port and a portion of the sealing element extend into the first cavity, and the sealing element can move within the first cavity under the drive of the solenoid valve. The outer cover also forms a second cavity, and a communication port is provided between the first cavity and the second cavity. The second cavity is used to communicate with the oil tank, and the movement of the seal also includes a second position. When the seal is in the second position, the seal is separated from both the adsorption port and the communication port, thereby opening the adsorption port and the communication port.

2. The charcoal canister device according to claim 1, characterized in that, The movement of the seal includes a first position and a third position; When the seal is in the first position, the seal separates from the adsorption port, causing the adsorption port to open, and the seal blocks the communication port; When the seal is in the third position, the seal seals the adsorption port, and the seal separates from the communication port, causing the communication port to open.

3. The charcoal canister device according to claim 2, characterized in that, Also includes: The control device and the power supply device are electrically connected to the solenoid valve, respectively; When the control device controls the power supply device to supply a first current to the solenoid valve, the solenoid valve can drive the seal to the third position based on the first current, so that the seal closes the suction port and the communication port opens; When the control device controls the power supply device to supply a second current to the solenoid valve, the solenoid valve can drive the seal to the second position based on the second current, so that both the suction port and the communication port are opened. When the control device de-energizes the solenoid valve, the seal returns to the first position, causing the adsorption port to open and the communication port to close.

4. The charcoal canister device according to claim 2 or 3, characterized in that, The outer cover includes a cover body, a first partition, and a second partition. The cover body is disposed on the carbon canister, covering the desorption port and the adsorption port. The second partition is disposed within the cover body to divide the space within the cover body into a first chamber and a second chamber. The adsorption port extends into the first chamber. The first partition divides the first chamber into a first cavity and a second cavity. The cover body is provided with a first connecting part communicating with the second cavity and a second connecting part communicating with the second cavity. The first connecting part is used to connect to the fuel tank, and the second connecting part is used to connect to the engine. The first partition is provided with the communication port. When the seal is in the first position, the seal abuts against the first partition and blocks the communication port, so that the communication port is closed. When the seal is in the second position or the third position, the seal is separated from the first partition.

5. The charcoal canister device according to claim 4, characterized in that, The first connecting part is a quick-connect connector, and / or the second connecting part is a quick-connect connector.

6. The charcoal canister apparatus according to any one of claims 1 to 3, characterized in that, The sealing element includes a connecting rod and a blocking part. One end of the connecting rod is connected to the solenoid valve, and the other end of the connecting rod is connected to the blocking part. Under the drive of the solenoid valve, the connecting rod drives the blocking part to open or close the adsorption port.

7. The charcoal canister device according to claim 6, characterized in that, The shielding part is located outside the carbon canister, the connecting rod passes through the adsorption port, one end of the connecting rod extends into the carbon canister and is connected to the solenoid valve, and the other end of the connecting rod extends out of the carbon canister and is connected to the shielding part; The connecting rod and the blocking part are connected by a snap-fit ​​connection. One of the connecting rod and the blocking part is provided with a limiting groove, and the other of the connecting rod and the blocking part is provided with a protrusion. The protrusion is snapped into the limiting groove.

8. The charcoal canister device according to claim 6, characterized in that, Also includes: A sealing gasket is nested outside the shielding part. When the shielding part covers the adsorption port, the sealing gasket abuts against the hole wall of the adsorption port and the shielding part.

9. The charcoal canister apparatus according to any one of claims 1 to 3, characterized in that, Also includes: A clamping member is located inside the charcoal canister. The first end of the clamping member is connected to the inner surface of the charcoal canister, and the second end of the clamping member is provided with a clamping part to clamp the solenoid valve.

10. The charcoal canister device according to claim 9, characterized in that, Also includes: A third partition is disposed inside the carbon canister and divides the space inside the carbon canister into a third cavity and a fourth cavity. The third cavity and the fourth cavity are connected. The air inlet is disposed on the side of the carbon canister corresponding to the third cavity. The adsorption port and the desorption port are disposed on the side of the carbon canister corresponding to the fourth cavity. The solenoid valve is located in the fourth cavity.

11. A vehicle, characterized in that, It includes a vehicle body and a charcoal canister device as described in any one of claims 1 to 10, the charcoal canister device being connected to the vehicle body.

12. A control method for a charcoal canister device, characterized in that, A method for controlling a charcoal canister device as described in any one of claims 1 to 10, wherein the control method for the charcoal canister device comprises: Detect the current status of the engine; If the engine is currently in a desorbed state, obtain the fuel tank working pressure information; When the working pressure of the oil tank is less than or equal to the negative pressure threshold, a first current is supplied to the solenoid valve, causing the solenoid valve to drive the seal to close the adsorption port based on the first current; When the working pressure of the oil tank is greater than or equal to the positive pressure threshold, the solenoid valve is de-energized, causing the solenoid valve to open the adsorption port accordingly; or when the working pressure of the oil tank is greater than or equal to the positive pressure threshold, a second current is supplied to the solenoid valve, causing the solenoid valve to drive the sealing element based on the second current to open both the adsorption port and the communication port of the outer cover.

13. The control method for the charcoal canister device according to claim 12, characterized in that, When the working pressure of the oil tank is less than or equal to the negative pressure threshold, after a first current is supplied to the solenoid valve and maintained for a first set time, the control method of the charcoal canister device further includes: Determine if the working pressure of the fuel tank is less than the negative pressure threshold; If so, the solenoid valve is de-energized, and then a first current is supplied to the solenoid valve.

14. The control method for the charcoal canister device according to claim 12, characterized in that, The control method for the charcoal canister device also includes: Detect the fuel tank to begin refueling; Based on the fuel tank start refueling command, a second current is supplied to the solenoid valve, causing the solenoid valve to drive the sealing element to open both the suction port and the communication port of the outer cover based on the second current; Until a refueling end command is received from the fuel tank or the second current is supplied to the solenoid valve for a second set duration, the solenoid valve is de-energized, causing it to close the connection port.

Images