Fuel tank ventilation system for hybrid vehicles

Abstract

A fuel tank ventilation system for a hybrid vehicle, comprising: a first flow path configured to deliver fuel evaporated from a fuel tank to a carbon canister; a second flow path configured to deliver air for cooling a high-voltage battery to the carbon canister; a first three-way valve disposed on the second flow path and configured to control the opening and closing of a first discharge port for releasing pressure from the fuel tank; a second three-way valve disposed on the second flow path and configured to control the opening and closing of a second discharge port for allowing air for cooling the high-voltage battery to flow into the carbon canister or for discharging the air for cooling the high-voltage battery to the outside of the vehicle; and a controller configured to control the first three-way valve and the second three-way valve.

Description

Technical Field

[0001] The present disclosure relates to a fuel tank ventilation system for a hybrid vehicle. Background Art

[0002] Typically, gasoline is filled into fuel tanks as fuel for vehicle engines. If the ambient temperature is high or the vapor pressure in the fuel tank increases due to factors such as vapor movement, there is a risk that gasoline evaporated gas will escape through gaps in the fuel tank. Because gasoline evaporated gas is a carcinogen and harmful to the human body, various countries have enacted environmental laws to regulate the release of evaporated gas. In practice, vehicles are equipped with carbon canisters to capture evaporated gas, preventing its release.

[0003] In hybrid vehicles, the fuel tank and high-voltage battery are used simultaneously. As air that has cooled the high-voltage battery is discharged into the vehicle, the vehicle's interior temperature rises. Furthermore, the vehicle cannot recover the heat energy of the air that has been heated by the discharge of the air that has cooled the high-voltage battery. Furthermore, hybrid vehicles that utilize both a fuel tank and a high-voltage battery must simultaneously process both the air that has cooled the high-voltage battery and gasoline evaporation gases. However, there is no system that can effectively process both the air that has cooled the high-voltage battery and the gasoline evaporation gases, resulting in reduced efficiency in cooling the high-voltage battery and purging the carbon canister.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0005] The present disclosure relates to a fuel tank ventilation system for a hybrid vehicle. Detailed description relates to a fuel tank ventilation system that dualizes a ventilation structure according to pressure conditions in a fuel tank.

[0006] One embodiment of the present disclosure provides a fuel tank vent system for a hybrid vehicle that dualizes a vent structure for releasing pressure of a fuel tank according to pressure conditions in the fuel tank.

[0007] Another embodiment of the present disclosure provides a fuel tank ventilation system for a hybrid vehicle that can release pressure in a fuel tank while increasing cooling efficiency of a high-voltage battery when the vehicle travels in an electric vehicle (EV) mode.

[0008] Yet another embodiment of the present disclosure provides a fuel tank ventilation system for a hybrid vehicle, which can increase the service life of an air filter for filtering impurities in the air and allows easy replacement of the air filter.

[0009] According to an embodiment of the present disclosure, a fuel tank ventilation system for a hybrid vehicle is provided. The fuel tank ventilation system for a hybrid vehicle may include: a first flow path for conveying fuel evaporated from the fuel tank to a carbon canister; a second flow path for conveying air for cooling a high-voltage battery to the carbon canister; a first three-way valve disposed on the second flow path for controlling the opening and closing of a first discharge port for releasing pressure from the fuel tank; a second three-way valve disposed on the second flow path for controlling the opening and closing of a second discharge port for allowing air that has cooled the high-voltage battery to flow into the carbon canister or for discharging the air that has cooled the high-voltage battery to the outside; and a controller for controlling the first and second three-way valves based on the pressure in the fuel tank and whether the vehicle is traveling in EV mode.

[0010] According to one embodiment, when the pressure of the fuel tank is in a positive pressure state, the controller controls the first three-way valve to discharge the air in the fuel tank to the outside through the first discharge port.

[0011] According to one embodiment, air in the fuel tank is delivered to the canister through the first flow path, and the air delivered to the canister is discharged to the outside through the second flow path and the first discharge port.

[0012] According to one embodiment, when the pressure of the fuel tank is in a negative state, the controller controls the first and second three-way valves to move air that has cooled the high voltage battery to the canister, thereby increasing purification efficiency of the canister.

[0013] According to one embodiment, the first discharge port and the second discharge port are closed by controlling the first three-way valve and the second three-way valve.

[0014] According to one embodiment, when the vehicle travels in the EV mode, the controller controls the first three-way valve to discharge the air that has cooled the high-voltage battery to the outside through the second discharge port.

[0015] According to one embodiment, the controller determines whether the vehicle is traveling in the EV mode based on the state of charge (SOC) of the high voltage battery.

[0016] According to one embodiment, the controller increases a driving amount of a blower motor provided in the high voltage battery to increase an amount of air flowing into the high voltage battery.

[0017] According to one embodiment, an air discharge port for discharging air that has cooled the high voltage battery is provided to the high voltage battery, and an air filter is provided at an end of the air discharge port.

[0018] According to one embodiment, the air filter is provided between the air discharge port and the second flow path, and the air filter includes a cover coupled to the air discharge port and filter paper detachably attached in the cover.

[0019] According to one embodiment, a check valve is provided between the first three-way valve and the second three-way valve, and the check valve allows the air that has cooled the high-voltage battery to flow only toward the canister.

[0020] According to one embodiment, the first three-way valve is disposed near the canister, and the second three-way valve is disposed near the high-voltage battery.

[0021] According to one embodiment of the present disclosure, a hybrid vehicle fuel tank ventilation system can relieve fuel tank pressure when the fuel tank is in a positive state, and enhance the canister's purification performance when the fuel tank is in a negative state by using the heat energy of the air that has already cooled the high-voltage battery. Furthermore, when the vehicle is operating in EV mode, the hybrid vehicle fuel tank ventilation system can increase the amount of air drawn by the high-voltage battery, effectively cooling the high-voltage battery. In other words, the hybrid vehicle fuel tank ventilation system can simultaneously regulate fuel tank pressure, enhance canister performance, and effectively cool the high-voltage battery.

[0022] According to one embodiment of the present disclosure, the air filter can be installed inside the vehicle, and only the filter paper in the air filter components can be replaced. Therefore, if the air filter reaches the end of its service life, the user can simply replace the filter paper without lifting the vehicle. Furthermore, since the air filter according to one embodiment of the present disclosure filters the internal air inside the vehicle, its service life can be further extended compared to filtering the air outside the vehicle.

[0023] It should be understood that the term "vehicle" or "vehicular" or other similar terms as used herein include general motor vehicles, such as passenger cars (including sport utility vehicles (SUVs), buses, trucks), various commercial vehicles, watercraft (including various ships and boats), aircraft, etc., and include hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuels from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more power sources, such as a gasoline-powered vehicle and an electric vehicle.

[0024] These and other features of embodiments of the present disclosure are discussed herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other features of the present disclosure will now be described in detail with reference to certain exemplary embodiments thereof shown in the accompanying drawings, which are given by way of example only and therefore do not limit the present disclosure, wherein:

[0026] Figure 1 is a diagram illustrating a fuel tank ventilation system for a hybrid vehicle according to one embodiment of the present disclosure.

[0027] Figure 2 is a block diagram for explaining a controller according to one embodiment of the present disclosure.

[0028] Figure 3 is a diagram showing an embodiment of a fuel tank ventilation system for a hybrid vehicle when the pressure of the fuel tank satisfies a positive pressure condition.

[0029] Figure 4 is a diagram showing an embodiment of a fuel tank ventilation system for a hybrid vehicle when the pressure of the fuel tank satisfies a negative pressure condition.

[0030] Figure 5 is a diagram showing an embodiment of a fuel tank ventilation system for a hybrid vehicle when the vehicle is traveling in EV mode.

[0031] Figure 6 is a diagram showing an arrangement relationship between a fuel tank and a high-voltage battery according to one embodiment of the present disclosure.

[0032] Figure 7 is a diagram illustrating an air filter according to one embodiment of the present disclosure.

[0033] It should be understood that the accompanying drawings are not necessarily to scale, and that they present a somewhat simplified representation of various preferred features illustrative of the basic principles of the present disclosure. The specific design features of the present disclosure as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes, will be determined in part by the specific intended application and use environment.

[0034] In the figures, like reference numerals refer to the same or equivalent parts of embodiments of the present disclosure throughout the several figures of the drawing. DETAILED DESCRIPTION

[0035] The advantages and features of the present disclosure and methods for achieving them will become apparent with reference to the embodiments described in detail below and the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art to which the present disclosure belongs, and the present disclosure is limited only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same elements.

[0036] The terms “component,” “unit,” “module,” etc. described in the specification mean a unit for processing at least one function or operation, and this can be implemented by hardware or software, or a combination of hardware and software.

[0037] Furthermore, in this specification, the names of components are classified as first, second, etc. in order to distinguish the names of components from each other in the same relationship, and are not necessarily limited to the order thereof in the following description.

[0038] This detailed description is an illustration of the embodiments of the present disclosure. In addition, the foregoing is intended to illustrate and explain the preferred embodiments of the present disclosure, and the present disclosure may be used in various other combinations, modifications and environments. That is, changes or modifications may be made within the scope of the concepts of the disclosure described in this specification, within the scope of equivalence with the disclosure, and / or within the scope of the technology and knowledge in this field. The described embodiments are intended to illustrate the best mode for implementing the technical spirit of the present disclosure, and various changes may also be made in the specific application and use of the present disclosure. Therefore, the detailed description of the embodiments of the above disclosure is not intended to limit the present disclosure to the disclosed embodiments. In addition, it should be interpreted that the attached claims are also intended to cover these other embodiments.

[0039] Figure 1 is a diagram illustrating a fuel tank ventilation system for a hybrid vehicle according to one embodiment of the present disclosure.

[0040] refer to Figure 1 The fuel tank ventilation system 1 for a hybrid vehicle can be implemented by a fuel tank 100, a carbon canister 200, a high-voltage battery 400, and a controller 800. The fuel tank ventilation system 1 for a hybrid vehicle can prevent the discharge of evaporated gas evaporated from the fuel tank 100, and at the same time can control the paths of air and evaporated gas passing through the controller 800 to recover heat energy of the air that has cooled the high-voltage battery 400.

[0041] The fuel tank 100 and the carbon canister 200 can be connected through a first flow path 510. The fuel evaporated from the fuel tank 100 (evaporated gas) can be transported to the carbon canister 200. In a state where the engine 300 has stopped, the carbon canister 200 can be operated to capture the gas fuel in the activated carbon installed in the carbon canister (adsorption), and when the engine 300 is operated, new air is injected from the outside of the carbon canister 200 to purify (desorb) the fuel adsorbed to the activated carbon to the intake system of the engine 300. That is, the carbon canister 200 can be operated to repeatedly perform adsorption and purification. Adsorption in the carbon canister 200 is a state in which hydrocarbon gas is captured while being liquefied into activated carbon, and heat is generated as the phase changes from gas to liquid. When the temperature is higher, the speed at which liquefaction occurs and the adsorption rate are lower, so that the temperature increase inside the carbon canister 200 must be suppressed to increase the adsorption rate of the fuel gas. Purification of carbon canister 200 involves evaporating hydrocarbons trapped in the activated carbon into a fine liquid state and discharging them into the engine's intake system. During this liquefaction, an endothermic reaction occurs. Therefore, as the temperature decreases, the vaporization rate and purification efficiency decrease, requiring the suppression of temperature drops within carbon canister 200 to improve purification performance. In short, thermal energy may be required to transport the fuel trapped in the activated carbon in carbon canister 200 to engine 300.

[0042] A purge control valve 250 for purifying fuel may be provided on a flow path connecting the canister 200 with an intake system side of the engine 300 .

[0043] The canister 200 and the high voltage battery 400 may be connected through a second flow path 520. The second flow path 520 may deliver air for cooling the high voltage battery 400 to the canister 200.

[0044] The high-voltage battery 400 may be a structure that supplies electric energy for driving an electric motor (not shown). That is, the high-voltage battery 400 may be a structure that is installed in a vehicle to drive the vehicle through an electric motor (not shown). The high-voltage battery 400 may include an air inlet 401 for allowing external air to flow into the high-voltage battery 400 for cooling, and an air discharge port 403 for discharging the air that has cooled the high-voltage battery 400. At this time, the external air may mean air introduced from the outside based on the high-voltage battery 400, and may mean air flowing into the high-voltage battery 400 from the interior of the vehicle. In addition, the high-voltage battery 400 may be provided with a blower motor 410 for causing air to flow into the high-voltage battery 400.

[0045] The air filter 450 may be provided at the end of the air discharge port 403 of the high-voltage battery 400. The air filter 450 may filter impurities from the air that cools the high-voltage battery 400. The air filter 450 is detachably attached to the high-voltage battery 400 and may be modularized together with the high-voltage battery 400.

[0046] A first three-way valve 610 and a second three-way valve 630 may be disposed on the second flow path 520 . The first three-way valve 610 and the second three-way valve 630 may represent three-way valves. For example, the first three-way valve 610 and the second three-way valve 630 may be solenoid valves. The first three-way valve 610 may be disposed adjacent to the carbon canister 200 , and the second three-way valve 630 may be disposed adjacent to the high-voltage battery 400 . The first three-way valve 610 may control the opening and closing of the first discharge port 530 , which is a passage for releasing pressure from the fuel tank 100 when the pressure in the fuel tank 100 is in a positive pressure state. Air in the fuel tank 100 may be discharged to the exterior of the vehicle through the first discharge port 530 . That is, the first three-way valve 610 may be disposed at the point where the second flow path 520 meets the first discharge port 530 .

[0047] When the pressure in the fuel tank 100 is negative, the second three-way valve 630 allows air cooling the high-voltage battery 400 to flow to the carbon canister 200. Furthermore, when the vehicle is operating in EV mode, the second three-way valve 630 controls the opening and closing of the second discharge port 540 to discharge air cooling the high-voltage battery 400 to the outside. Specifically, the second three-way valve 630 may be positioned at the point where the second flow path 520 meets the second discharge port 540. The first discharge port 530 and the second discharge port 540 may serve as passages for discharging air to the exterior of the vehicle.

[0048] A check valve 700 may be disposed between the first three-way valve 610 and the second three-way valve 630. The check valve 700 allows air cooling the high-voltage battery 400 to flow only toward the canister 200. Specifically, the check valve 700 can prevent air or evaporated fuel from flowing from the canister 200 into the high-voltage battery 400. If the opening and closing of the first three-way valve 610 and the second three-way valve 630 are controlled, air or evaporated fuel may not flow from the canister 200 into the high-voltage battery 400. However, if the first three-way valve 610 or the second three-way valve 630 malfunctions, air or evaporated fuel may flow from the canister 200 into the high-voltage battery 400. Therefore, in preparation for a situation where at least one of the first three-way valve 610 and the second three-way valve 630 has malfunctioned, the check valve 700 can prevent air or evaporated fuel from flowing from the canister 200 into the high-voltage battery 400. Furthermore, the check valve 700 can prevent evaporated fuel from flowing into the vehicle through the high-voltage battery 400.

[0049] The controller 800 may control the opening and closing of the first and second three-way valves 610 and 630 based on the pressure in the fuel tank 100 and whether the vehicle is traveling in the EV mode. For example, the controller 800 may be an electronic control unit (ECU).

[0050] For example, the controller 800 can determine whether to control the flow of evaporated fuel from the fuel tank 100 to the canister 200 or to control the flow of air that has cooled the high-voltage battery 400 to the canister 200, depending on whether the pressure in the fuel tank 100 is positive or negative. If the controller 800 controls the flow of evaporated fuel from the fuel tank 100 to the canister 200, the fact that the pressure in the fuel tank 100 remains positive can be mitigated, thereby ensuring a smooth fuel supply. If the controller 800 controls the flow of air that has cooled the high-voltage battery 400 to the canister 200, air whose temperature has been raised by heat exchange in the high-voltage battery 400 can flow to the canister 200. This high-temperature air can cause an endothermic reaction in the activated carbon in the canister 200. The fuel captured by the endothermic reaction in the activated carbon can be transferred to the engine 300. In other words, the air whose temperature has been raised by heat exchange in the high-voltage battery 400 can flow into the canister 200, thereby enhancing the purification performance (or purification efficiency) of the canister 200. Therefore, the heat energy of the air that cools the high-voltage battery 400 can be recovered.

[0051] For example, when the vehicle is traveling in EV mode, the controller 800 can increase the amount of air driven by the blower motor 410 located in the high-voltage battery 400. Consequently, the amount of air flowing into the air inlet 401 of the high-voltage battery 400 can be increased, effectively cooling the high-voltage battery 400. Furthermore, since the controller 800 controls the second three-way valve 630 to discharge the air cooling the high-voltage battery 400 through the second discharge port 540, the air, which has already been heated, can be discharged to the outside of the vehicle, thereby preventing the vehicle's temperature from increasing.

[0052] According to one embodiment of the present disclosure, a fuel tank ventilation system 1 for a hybrid vehicle can release pressure from the fuel tank 100 when the pressure is positive, and can enhance the purification performance of the carbon canister 200 by using the heat energy of the air cooling the high-voltage battery 400 when the pressure is negative. Furthermore, when the vehicle is operating in EV mode, the fuel tank ventilation system 1 for a hybrid vehicle can increase the amount of air drawn by the high-voltage battery 400 to effectively cool the high-voltage battery 400. In summary, the fuel tank ventilation system 1 for a hybrid vehicle can simultaneously regulate the pressure of the fuel tank 100, enhance the performance of the carbon canister 200, and effectively cool the high-voltage battery 400.

[0053] Figure 2is a block diagram for explaining functions of a controller according to one embodiment of the present disclosure.

[0054] refer to Figure 1 and Figure 2 The pressure sensor 150 may measure the pressure of the fuel tank 100. The pressure sensor 150 may measure whether the pressure in the fuel tank 100 is in a positive pressure state or a negative pressure state. The data measured by the pressure sensor 150 may be transmitted to the controller 800.

[0055] The controller 800 may continuously monitor the state of charge (SOC) of the high-voltage battery 400. The controller 800 may determine whether the vehicle is traveling in EV mode or driven by the engine 300 based on the SOC of the high-voltage battery 400. For example, when the SOC of the high-voltage battery 400 is a predetermined value or greater, the controller 800 may determine that the vehicle is traveling in EV mode. However, unlike the above example, the controller 800 may directly determine whether the engine 300 is being driven to also determine whether the vehicle is traveling in EV mode. For example, the controller 800 may determine whether the vehicle is traveling in EV mode based on whether the engine 300 is ignited, sensing data of the engine's camshaft sensor (not shown), etc.

[0056] Controller 800 can control first three-way valve 610, second three-way valve 630, and blower motor 410 based on data received from pressure sensor 150 and data monitored from high-voltage battery 400. Controller 800 can determine whether the pressure in fuel tank 100 is in a positive pressure state, whether the pressure in fuel tank 100 is in a negative pressure state, and whether the vehicle is traveling in EV mode. Based on these conditions, controller 800 can control the opening and closing of first three-way valve 610 and second three-way valve 630, and control the degree of driving of blower motor 410.

[0057] Figure 3 is a diagram showing an embodiment of a fuel tank ventilation system for a hybrid vehicle when the pressure of the fuel tank satisfies a positive pressure condition.

[0058] refer to Figure 3 When the pressure in the fuel tank 100 satisfies the positive pressure condition, the controller 800 may close the first three-way valve 610. Closing the first three-way valve 610 may mean opening the first drain port 530. Therefore, the controller 800 may control the first three-way valve 610 to drain air from the fuel tank 100, the first flow path 510, and the second flow path 520 through the first drain port 530. When the air in the fuel tank 100, the first flow path 510, and the second flow path 520 is drained, the pressure in the fuel tank 100 may change.

[0059] When the pressure in fuel tank 100 satisfies the positive pressure condition, the evaporated fuel in fuel tank 100 may not flow to canister 200. Consequently, the amount of fuel transferred from canister 200 to engine 300 may decrease, thereby reducing the efficiency of engine 300. Therefore, when controller 800 opens first drain port 530 to discharge air in fuel tank 100, first flow path 510, and second flow path 520 to the outside of the vehicle, the pressure in fuel tank 100 may be adjusted.

[0060] Figure 4 is a diagram showing an embodiment of a fuel tank ventilation system for a hybrid vehicle when the pressure of the fuel tank satisfies a negative pressure condition.

[0061] refer to Figure 4 , when the pressure in the fuel tank 100 meets the negative pressure condition, the controller 800 may open the first three-way valve 610 and close the second three-way valve 630. Opening the first three-way valve 610 may mean closing the first exhaust port 530. Closing the second three-way valve 630 may mean closing the second exhaust port 540. At this time, since the pressure in the fuel tank 100 is in a negative pressure state and the fuel is transferred from the carbon canister 200 toward the intake side of the engine 300, the amount of air flowing into the high-voltage battery 400 may increase due to the pressure difference. Therefore, even if there is no suction pump for causing air to flow into the high-voltage battery 400 alone through the above-mentioned control, the amount of air flowing into the high-voltage battery 400 can be increased, and the cooling efficiency of the high-voltage battery 400 can be increased.

[0062] When the pressure in the fuel tank 100 meets the negative pressure condition, the air that cools the high-voltage battery 400 can flow to the carbon canister 200. At this time, the air may not be discharged to the outside of the vehicle through the first discharge port 530 and the second discharge port 540. The negative pressure of the fuel tank 100 can be released by the flow of air. The temperature of the air that has undergone heat exchange during the cooling process of the high-voltage battery 400 may increase. The air whose temperature has increased can flow to the carbon canister 200 to promote the desorption reaction in the carbon canister 200. Therefore, it is possible to improve the efficiency of the purification phenomenon in which the fuel moves from the carbon canister 200 to the intake side of the engine 300.

[0063] According to one embodiment of the present disclosure, the fuel tank ventilation system 1 for a hybrid vehicle may have a path for releasing positive pressure in the fuel tank 100 and a path for releasing negative pressure in the fuel tank 100 that are different from each other.

[0064] Figure 5 is a diagram showing an embodiment of a fuel tank ventilation system for a hybrid vehicle when the vehicle is traveling in EV mode.

[0065] refer to Figure 5, if the vehicle is traveling in EV mode, the controller 800 may open the second three-way valve 630. Opening the second three-way valve 630 may mean opening the second exhaust port 540. In addition, the controller 800 may increase the driving amount of the blower motor 410 provided in the high-voltage battery 400. Therefore, the amount of air introduced through the air inlet 401 of the high-voltage battery 400 can be increased. The air that cools the high-voltage battery 400 can be discharged to the outside of the vehicle through the second exhaust port 540. Air whose temperature has risen does not flow into the vehicle, thereby preventing the phenomenon of temperature rise in the vehicle. In addition, as the driving amount of the blower motor 410 increases, the cooling efficiency of the high-voltage battery 400 can be increased.

[0066] Figure 6 is a diagram showing an arrangement relationship between a fuel tank and a high-voltage battery according to one embodiment of the present disclosure.

[0067] refer to Figure 6 , the high-voltage battery 400 may be disposed above the floor panel 50 located on the inner side of the vehicle body, and the fuel tank 100 may be disposed below the floor panel 50. That is, the high-voltage battery 400 may be disposed near the interior of the vehicle relative to the floor panel 50, and the fuel tank 100 may be disposed near the bottom surface of the vehicle or the ground relative to the floor panel 50, so that the air inlet 401 of the high-voltage battery 400 may introduce the interior air of the vehicle.

[0068] An air filter 450 may be positioned at the end of the air outlet 403. Air filter 450 filters impurities from the air discharged through the air outlet 403. Because air filter 450 is positioned above the floor panel 50, the user can replace air filter 450 without lifting the vehicle. Furthermore, since the high-voltage battery 400 is positioned inside the vehicle relative to the floor panel 50, the air flowing into the high-voltage battery 400 can be air from the vehicle interior. Therefore, air filter 450 can filter air from the vehicle interior, which contains less foreign matter than the air outside the vehicle, thereby increasing the service life of air filter 450.

[0069] Figure 7 is a diagram illustrating an air filter according to one embodiment of the present disclosure.

[0070] refer to Figure 6 and Figure 7 The air filter 450 may include a cover 451 and filter paper 453. The filter paper 453 may be a structure that should be replaced periodically. Therefore, the operation of replacing the filter paper 453 can be easily performed only when the air filter 450 is easily attached or detached. According to one embodiment of the present disclosure, since the air filter 450 is arranged inside the vehicle, the filter paper 453 can be easily replaced.

[0071] The filter paper 453 may be detachably attached to the cover 451. The cover 451 is coupled to the air outlet 403 and may be detachably attached to the air outlet 403. The user can easily replace the filter paper 453 by removing the air filter 450 provided inside the vehicle from the air outlet 403 and then removing the filter paper 453 from the cover 451.

[0072] According to one embodiment of the present disclosure, the air filter 450 can be installed inside the vehicle, and only the filter paper 453 of the air filter 450 can be replaced. Therefore, if the service life of the air filter 450 ends, the user can replace only the filter paper 453 of the air filter 450 without lifting the vehicle. In addition, since the air filter 450 according to an embodiment of the present disclosure filters the interior air of the vehicle, the service life of the air filter 450 can be further extended compared to the case of filtering the air outside the vehicle.

[0073] As described above, although the embodiments of the present disclosure have been described with reference to the accompanying drawings, those skilled in the art will appreciate that other specific forms may be implemented without changing the technical spirit or basic features of the present disclosure. Therefore, it should be understood that the above embodiments are illustrative and not restrictive in all aspects.

Claims

1. A fuel tank ventilation system for a hybrid vehicle, the fuel tank ventilation system comprising: a first flow path configured to deliver evaporated fuel from the fuel tank to the carbon canister; a second flow path configured to deliver air for cooling the high-voltage battery to the carbon canister; a first three-way valve disposed on the second flow path and configured to control opening and closing of a first drain port, the first drain port being used to release pressure from the fuel tank; a second three-way valve disposed on the second flow path and configured to control opening and closing of a second exhaust port for allowing air used to cool the high-voltage battery to flow into the carbon canister or for exhausting the air used to cool the high-voltage battery to the outside of the vehicle; as well as A controller is configured to control the first and second three-way valves based on a pressure in the fuel tank and to control the second three-way valve based on whether the vehicle is traveling in an EV mode.

2. The fuel tank ventilation system according to claim 1, wherein: When the pressure of the fuel tank is in a positive pressure state, the controller is configured to control the first three-way valve to discharge the air in the fuel tank to the outside of the vehicle through the first discharge port.

3. The fuel tank ventilation system according to claim 2, wherein: Air in the fuel tank is delivered to the canister through the first flow path, and wherein the air delivered to the canister is discharged to the outside of the vehicle through the second flow path and the first discharge port.

4. The fuel tank ventilation system according to claim 1, wherein: When the pressure of the fuel tank is in a negative pressure state, the controller is configured to control the first three-way valve and the second three-way valve to move air for cooling the high-voltage battery to the canister.

5. The fuel tank ventilation system according to claim 4, wherein: The first discharge port is configured to be closed by control of the first three-way valve, and the second discharge port is configured to be closed by control of the second three-way valve.

6. The fuel tank ventilation system according to claim 1, wherein: When the vehicle is traveling in an EV mode, the controller is configured to control the second three-way valve to discharge air for cooling the high-voltage battery to the outside of the vehicle through the second discharge port.

7. The fuel tank ventilation system according to claim 6, wherein: The controller is configured to determine whether the vehicle is traveling in an EV mode based on a state of charge of the high-voltage battery.

8. The fuel tank ventilation system according to claim 6, further comprising a blower motor provided in the high voltage battery, wherein The controller is configured to increase a driving amount of the blower motor to increase an amount of air flowing into the high-voltage battery.

9. The fuel tank ventilation system of claim 1 , further comprising: an air discharge port configured to discharge air for cooling the high-voltage battery; as well as An air filter is provided at an end portion of the air discharge port.

10. The fuel tank ventilation system according to claim 9, wherein: The air filter is disposed between the air discharge port and the second flow path, and wherein the air filter comprises: a cover coupled to the air discharge port; and Filter paper is detachably attached in the cover.

11. The fuel tank ventilation system according to claim 1, further comprising a check valve disposed between the first three-way valve and the second three-way valve, wherein The check valve is configured to allow air for cooling the high-voltage battery to flow only toward the canister.

12. The fuel tank ventilation system according to claim 11, wherein: The first three-way valve is disposed near the canister, and wherein the second three-way valve is disposed near the high-voltage battery.

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