Automobile fuel filling device, automobile fuel filling system and automobile fuel control method

Abstract

The invention discloses an automobile fuel filling device, a filling system and a control method.The automobile fuel filling device comprises a fuel filling pipe and an oil filler cap, the oil filler cap comprises a shell, a pressure sensing part and a locking part, the pressure sensing part and the locking part are installed in the shell, the inner end of the pressure sensing part communicates with the interior of the fuel filling pipe, and the inner end of the locking part communicates with the interior of the fuel filling pipe; the pressure sensing part can move under the action of gas pressure and drive the locking part to move, when the gas pressure is higher than a safe pressure threshold value, the locking part is located at the first position, the oil filler cap is locked, and the oil filler cannot be opened; and when the gas pressure in the fuel oil filling pipe is not higher than the safety pressure threshold value, the locking component is located at the second position, the oil filler cap is unlocked, and the oil filler can be opened. The pressure sensing component and the locking component are additionally arranged, the positions of the pressure sensing component and the locking component are associated with the gas pressure, only when the gas pressure is not higher than the safety pressure threshold value, the oil filler cap is unlocked, the oil filler can be opened, and safety accidents caused by high-pressure oil gas injection are prevented.

Description

Technical Field

[0001] The invention relates to the technical field of automobile fuel filling control, and in particular to an automobile fuel filling device, a filling system and a control method. Background Art

[0002] In order to meet the emission requirements of the National VI regulations, plug-in new energy vehicles usually use a high-pressure fuel tank system to ensure that as few fuel volatiles as possible are emitted into the atmosphere during pure electric driving. The fuel tank exhaust channel is blocked by a fuel tank isolation valve, and the fuel volatiles are stored in the fuel tank. The fuel tank isolation valve is opened only when the engine is started to desorb the charcoal canister or when refueling, and the fuel vapor in the fuel tank is released into the charcoal canister, thereby reducing the evaporative emissions of the entire vehicle.

[0003] The high-pressure fuel tank system solves the problem of evaporative emissions, but at the same time creates another problem. When the pressure in the high-pressure fuel tank system is relatively high, opening the fuel filler cap will cause high-pressure oil and gas to spray out from the fuel filler port, posing a safety hazard.

[0004] Therefore, how to provide an automobile fuel filling device, a filling system and a control method to solve the safety problem caused by high-pressure fuel vapor injection is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide an automobile fuel filling device, a filling system and a control method to solve the safety problem caused by high-pressure fuel vapor injection.

[0006] In order to solve the above technical problems, the present invention provides an automobile fuel filling device, including a fuel filling pipe and a fuel filler cap, the open end of the fuel filling pipe forms a fuel filling port, the fuel filler cap is used to open or block the fuel filling port, the fuel filler cap includes a shell, a pressure sensing component and a locking component, the pressure sensing component and the locking component are both installed inside the shell, the inner end of the pressure sensing component is connected to the inside of the fuel filling pipe, the pressure sensing component can move under the action of the gas pressure inside the fuel filling pipe and drive the locking component to move, when the gas pressure inside the fuel filling pipe is higher than the safety pressure threshold, the locking component is in a first position, when the gas pressure inside the fuel filling pipe is not higher than the safety pressure threshold, the locking component is in a second position,

[0007] When in the first position, the locking component locks the fuel filler cap, and the fuel filler cap cannot open the fuel filler port; when in the second position, the locking component unlocks the fuel filler cap, and the fuel filler cap can open the fuel filler port.

[0008] The automobile fuel filling device of the present invention improves the structure of the fuel filler cap. Specifically, a pressure sensing component and a locking component are added inside the shell of the fuel filler cap, and the positions of the pressure sensing component and the locking component are related to the gas pressure inside the fuel filling pipe. Only when the gas pressure inside the fuel filling pipe drops to a safety pressure threshold or below the safety pressure threshold, the locking component will unlock the fuel filler cap, and the fuel filler cap can open the fuel port for fuel filling. Otherwise, the fuel filler cap cannot be opened and the fuel filling operation cannot be performed. This prevents the fuel filler cap from being opened when the gas pressure is relatively high, thereby preventing the safety problem of high-pressure oil and gas being ejected from the fuel port, thereby improving the safety of fuel filling.

[0009] Optionally, the fuel filling pipe and the housing are provided with matching threaded fittings, the housing is provided with a locking hole, the locking hole is located in the region of the threaded fitting provided on the housing, the locking component is partially located in the locking hole, and the pressure sensing component can drive the locking component to move axially along the locking hole.

[0010] When in the first position, the locking component squeezes the threaded mating portion arranged on the fuel filler pipe, the two threaded mating portions are abnormally engaged, and the fuel filler cap cannot rotate normally to disengage from the fuel filler pipe; when in the second position, the locking component loosens the fuel filler pipe, the two threaded mating portions are normally engaged, and the fuel filler cap can rotate normally to disengage from the fuel filler pipe.

[0011] Optionally, the locking component is a spherical structure, the locking hole is a cylindrical hole, and the diameter of the locking hole is smaller than the diameter of the locking component.

[0012] Optionally, the pressure sensing component comprises a valve stem, the inner end of the valve stem is connected to the interior of the fuel filling pipe, the valve stem can move axially under the action of the internal gas pressure of the fuel filling pipe, the valve stem has a matching section, the locking component is in contact with the peripheral wall of the matching section,

[0013] The mating section includes a locking portion, a transition connection portion and an unlocking portion which are sequentially connected from the inside to the outside. The diameter of the unlocking portion is smaller than the diameter of the locking portion. The diameter of the transition connection portion gradually decreases from the locking portion to the unlocking portion. When the locking component is in contact with the peripheral wall of the locking portion, the locking component is in the first position; when the locking component is in contact with the peripheral wall of the unlocking portion, the locking component is in the second position.

[0014] Optionally, an axially extending mounting hole is provided inside the shell, the inner end of the mounting hole is connected to the interior of the fuel filling pipe, the outer end of the mounting hole passes through the end wall of the shell, the valve stem is installed inside the mounting hole, the valve stem and the mounting hole are sealed along the circumferential direction, and can slide within a preset range along the axial direction.

[0015] Optionally, an installation cavity is provided inside the shell for installing the valve stem, the inner end of the installation cavity is an open end, the outer end wall of the installation cavity is provided with a through hole, the valve stem includes a sealing section, the sealing section passes through the through hole, at least one of the outer peripheral wall of the sealing section and the inner wall of the through hole is installed with an annular sealing ring, and the sealing section and the through hole are circumferentially sealed by the annular sealing ring.

[0016] Optionally, the pressure sensing component further includes a guide ring, which is installed inside the installation cavity, the valve stem is movably inserted inside the guide ring, and the peripheral wall of the locking portion is in contact with the inner wall of the guide ring.

[0017] Optionally, the axial outermost end of the valve stem includes a push rod portion, and the end wall of the shell is provided with an observation hole, which forms an axial partial structure of the mounting hole. The diameter of the push rod portion gradually decreases from the inside to the outside, and the diameter of the inner end of the push rod portion is larger than the inner diameter of the observation hole, which is used to limit the maximum outward displacement of the valve stem.

[0018] Optionally, the valve stem is provided with a step portion at the inner end of the push rod portion, and the step portion is located on the outside of the mounting cavity. The pressure sensing component also includes an elastic component, and the elastic component is sleeved on the valve stem. The elastic component is located between the step portion and the outer end wall of the mounting cavity and is in an energy storage state.

[0019] The present invention provides an automobile fuel filling system, comprising a fuel tank and the above-mentioned automobile fuel filling device, wherein the end of the fuel filling pipe away from the fuel filler cap is connected to the fuel tank;

[0020] It also includes a fuel tank isolation valve, a fuel tank exhaust pipeline and a carbon canister, wherein the fuel tank exhaust pipeline is connected to the carbon canister and the fuel tank, the fuel tank isolation valve is arranged on the fuel tank exhaust pipeline, and the fuel tank isolation valve is in a normally closed state;

[0021] It also includes a refueling door, a refueling door lock, a door lock motor and a refueling door position sensor, wherein the refueling door lock is electrically connected to the door lock motor, the refueling door lock is used to lock or unlock the refueling door, and the refueling door position sensor is used to detect the open or closed state of the refueling door;

[0022] It also includes a controller, and the controller is electrically connected to the fuel tank isolation valve, the refueling door position sensor, and the door lock motor.

[0023] The automobile fuel filling system of the present invention includes the aforementioned automobile fuel filling device, and therefore has the same technical effects as the aforementioned automobile fuel filling device, which will not be described in detail herein.

[0024] The present invention also provides a method for controlling a vehicle fuel filling system, which is applicable to the above-mentioned vehicle fuel filling system and comprises the following steps:

[0025] Step S1: When the actual vehicle speed is not higher than the preset vehicle speed and a door unlocking signal request is received, the refueling door lock is driven to unlock;

[0026] Step S2: Detect the position state of the refueling door. If the position state of the refueling door is open, enter the refueling scene, supply power to the fuel tank isolation valve, and the fuel tank isolation valve is opened;

[0027] Step S3: when the fuel filler cap is in an unlocked state, opening the fuel filler cap to refuel;

[0028] Step S4: When the preset conditions are met, exit the refueling scene, stop supplying power to the fuel tank isolation valve, and close the fuel tank isolation valve. The preset conditions include at least one of the following: detecting that the position state of the refueling door is closed; the actual vehicle speed is higher than the preset vehicle speed; the time to enter the refueling scene is not less than the preset time.

[0029] The automobile fuel filling system control method of the present invention is applicable to the aforementioned automobile fuel filling system, and thus has the same technical effect as the aforementioned automobile fuel filling system, which will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic structural diagram of a specific embodiment of the automobile fuel filling device provided by the present invention;

[0031] Figure 2 for Figure 1 Schematic diagram of the structure of the valve stem in the automobile fuel filling device;

[0032] Figure 3 A schematic structural diagram of a specific embodiment of the automobile fuel filling system provided by the present invention;

[0033] in, Figure 1-Figure 3 The reference numerals in the figures are described as follows:

[0034] 1-Fuel filling pipe;

[0035] 2-fuel filler cap; 2a-locking hole; 21-housing; 21a-end wall; a-observation hole; 21b-installation cavity; o-through hole; 22-pressure sensing component; 221-valve stem; A-matching section; 221a-locking part; 221b-transition connection part; 221c-unlocking part; 221d-sealing section; c-annular receiving groove; 221e-top rod part; 221f-step part; 222-annular sealing ring; 223-guide ring; 224-elastic component; 23-locking component;

[0036] 3- Seals;

[0037] 4-Fuel tank;

[0038] 5-Oil tank isolation valve;

[0039] 6-Fuel tank exhaust pipe;

[0040] 7-Charcoal canister;

[0041] 81-refueling door; 82-refueling door lock; 83-refueling door position sensor;

[0042] 9-Controller. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] The “plurality” mentioned herein generally means more than two; and when “plurality” is used to indicate the number of certain components, it does not indicate the relationship between the quantities of these components.

[0045] In this article, the end close to the fuel filling pipe 1 is the inner end, that is, Figure 1 The end away from the fuel filling pipe 1 is the outer end, that is, Figure 2 The upper side of the viewing angle.

[0046] Please refer to Figure 1-Figure 2 , Figure 1 A schematic structural diagram of a specific embodiment of the automobile fuel filling device provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the valve stem in the automobile fuel filling device.

[0047] The present invention provides an automobile fuel filling device, comprising a fuel filling pipe 1 and a fuel filler cap 2, wherein the open end of the fuel filling pipe 1 forms a fuel filling port, and the fuel filler cap 2 is used to open or block the fuel filling port. The fuel filler cap 2 specifically comprises a shell 21, a pressure sensing component 22 and a locking component 23, wherein the pressure sensing component 22 and the locking component 23 are both installed inside the shell 21, and the inner end of the pressure sensing component 22 is connected to the inside of the fuel filling pipe 1, and the pressure sensing component 22 can move under the action of the gas pressure inside the fuel filling pipe 1 and drive the locking component 23 to move, and when the gas pressure inside the fuel filling pipe 1 is higher than the safety pressure threshold, the locking component 23 is in a first position, and when the gas pressure inside the fuel filling pipe 1 is not higher than the safety pressure threshold, the locking component 23 is in a second position.

[0048] When in the first position, the locking component 23 locks the fuel filler cap 2, and the fuel filler cap 2 cannot open the fuel filler port; when in the second position, the locking component 23 unlocks the fuel filler cap 2, and the fuel filler cap 2 can open the fuel filler port.

[0049] The automobile fuel filling device of the present invention improves the structure of the fuel filler cap 2. Specifically, a pressure sensing component 22 and a locking component 23 are added inside the shell 21 of the fuel filler cap 2, and the positions of the pressure sensing component 22 and the locking component 23 are both related to the internal gas pressure of the fuel filling pipe 1. Only when the internal gas pressure of the fuel filling pipe 1 drops to a safety pressure threshold or below the safety pressure threshold, the locking component 23 will unlock the fuel filler cap 2, and the fuel filler cap 2 can open the fuel filler port to fill the fuel. Otherwise, the fuel filler cap 2 cannot be opened and the fuel filling operation cannot be performed. This prevents the fuel filler cap 2 from being opened when the gas pressure is relatively high, thereby preventing the safety problem of high-pressure oil and gas being ejected from the fuel filler port, thereby improving the safety of fuel filling.

[0050] In this embodiment, the shell 21 is provided with an external thread, the fuel filling pipe 1 is provided with a matching internal thread, the shell 21 is provided with a locking hole 2a, the locking hole 2a is located in the area of ​​the external thread set on the shell 21, the locking component 23 is partially located in the locking hole 2a, and the pressure sensing component 22 can drive the locking component 23 to move axially along the locking hole 2a.

[0051] When in the first position, the locking component 23 squeezes the internal thread set on the fuel filling pipe 1, the two threaded mating parts are abnormally engaged, and the fuel filler cap 2 cannot rotate normally to disengage from the fuel filling pipe 1; when in the second position, the locking component 23 releases the fuel filling pipe 1, the two threaded mating parts are normally engaged, and the fuel filler cap 2 can rotate normally to disengage from the fuel filling pipe 1.

[0052] As set above, in this embodiment, the fuel filling pipe 1 and the housing 21 are connected by threads, and the locking component 23 realizes locking or unlocking the fuel filler cap 2 by changing the meshing state of the two threaded matching parts. It has a simple structure, convenient operation and low cost.

[0053] In practical applications, the specific shape of the locking component 23 is not limited, as long as it can achieve the above functions. Figure 1 As shown, in this embodiment, the locking component 23 is a spherical structure, so that the force position and direction that are constantly changing during the movement of the mechanism can be received and transmitted. Correspondingly, the locking hole 2a is a cylindrical hole, and the diameter of the locking hole 2a is smaller than the diameter of the locking component 23, ensuring that the locking component 23 will not fall out of the locking hole 2a.

[0054] In practical applications, the locking component 23 is preferably made of stainless steel to prevent corrosion from causing the mechanism to become inflexible.

[0055] In this embodiment, the housing 21 is provided with an external thread, and the fuel filling pipe 1 is provided with a matching internal thread. The housing 21 is partially inserted into the fuel filling pipe 1, and the two are threadedly connected. In practical applications, it is also feasible to provide the housing 21 with an internal thread and the fuel filling pipe 1 with a matching external thread. In this case, the housing 21 is sleeved on the outer periphery of the fuel filling pipe 1, and the two are threadedly connected. Of course, in the arrangement of this embodiment, the housing 21 has more sufficient installation space inside for installing the pressure sensing component 22 and the locking component 23, and the structure and size of the housing 21 are smaller, which reduces the overall volume and space occupation of the automobile fuel filling device, and is a more preferred technical solution.

[0056] In addition, in actual applications, the connection method between the fuel filler pipe 1 and the fuel filler cap 2 is not limited to the above-mentioned threaded connection method. For example, the fuel filler cap includes a shell body and a flap. The shell body is fixedly connected to the fuel filler pipe 1. The outer end wall of the shell body is provided with an opening. The flap is connected to the opening. The flap can open or close the opening. A flap lock is provided between the shell body and the flap. The flap lock can lock or unlock the flap. At this time, the locking component 23 can be set at the corresponding position of the flap lock. When the internal gas pressure of the fuel filler pipe 1 is higher than the safety pressure threshold, the locking component 23 pushes the flap lock to a locked position, and the flap is locked; when the internal gas pressure of the fuel filler pipe 1 is not higher than the safety pressure threshold, the locking component 23 pushes the flap lock to an unlocked position, and the flap is unlocked.

[0057] In summary, the locking component 23 only needs to be able to prevent the fuel filler port from opening when the gas pressure inside the fuel filler pipe 1 is higher than the safety pressure threshold.

[0058] It can be understood that when the fuel filler cap 2 is used to seal the fuel filler port, the sealing reliability should be ensured to prevent the leakage of fuel. Figure 1 As shown, the fuel filler cap 2 and the fuel filling pipe 1 are compressed by the seal 3 to achieve circumferential sealing after the threads are tightened. The material of the seal 3 is fluororubber material, and the surface of the seal 3 is also coated with fluororesin to ensure fuel corrosion resistance and fuel penetration barrier performance. The cross-section of the seal 3 is a C-shaped or U-shaped structure to reduce the torque required to tighten the fuel filler cap 2 and improve ease of use.

[0059] Please continue to refer to Figure 1-Figure 2 In this embodiment, the pressure sensing component 22 includes a valve stem 221, the inner end of the valve stem 221 is connected to the interior of the fuel filling pipe 1, the valve stem 221 can move axially under the action of the internal gas pressure of the fuel filling pipe 1, the valve stem 221 has a matching section A, and the locking component 23 is in contact with the peripheral wall of the matching section A.

[0060] The mating section A includes a locking portion 221a, a transition connection portion 221b and an unlocking portion 221c which are sequentially connected from the inside to the outside. The diameter of the unlocking portion 221c is smaller than the diameter of the locking portion 221a. The diameter of the transition connection portion 221b gradually decreases from the locking portion 221a to the unlocking portion 221c. When the locking portion 23 is in contact with the peripheral wall of the locking portion 221a, the locking portion 23 is in the first position; when the locking portion 23 is in contact with the peripheral wall of the unlocking portion 221c, the locking portion 23 is in the second position.

[0061] In this way, when the gas pressure inside the fuel filling pipe 1 is higher than the safety pressure threshold, the valve stem 221 moves upward due to the gas pressure, and the locking portion 221a moves upward to the position of the locking hole 2a. The locking component 23 is squeezed by the locking portion 221a and moves outward along the axis of the locking hole 2a, protruding from the external thread area set on the shell 21, and squeezing the internal thread set on the fuel filling pipe 1, so that the two threaded mating parts are abnormally engaged, thereby locking the fuel filler cap 2.

[0062] When the gas pressure inside the fuel filling pipe 1 is not higher than the safety pressure threshold, the valve stem 221 moves downward under the action of its own weight, and the unlocking portion 221c moves downward to the position of the locking hole 2a. There is a gap between the locking component 23 and the valve stem 221. The locking component 23 can move inward along the axis of the locking hole 2a under the action of the restoring force of the fuel filling pipe 1, without hindering the normal engagement of the two threaded mating parts, and the fuel filler cap 2 can be opened normally.

[0063] Therefore, the transition connection part 221b plays a transition role. The process of the locking component 23 sliding along the peripheral wall of the transition connection part 221b is the position switching process of the locking component 23. The position switching of the locking component 23 can be realized through the matching relationship between the locking component 23 and the locking part 221a, or the locking component 23 and the unlocking part 221c. The structure is simple, the transmission method is efficient, and the cost is low.

[0064] Among them, the shapes of the locking part 221a and the unlocking part 221c are preferably cylindrical, and the shape of the transition connection part 221b is preferably truncated cone, so that the constantly changing force position and direction during the movement of the mechanism can be received and transmitted, avoiding the instability of the mechanism operation caused by the special-shaped cross-section.

[0065] Among them, the material of the valve stem 221 is preferably stainless steel to ensure the strength and corrosion resistance of the valve stem 221, and provide a certain counterweight mass so that when the internal gas pressure is not higher than the safety pressure threshold, the valve stem 221 can return to the second position under the action of its own weight.

[0066] It can be understood that in order to ensure that the locking component 23 does not escape inward from the locking hole 2a, the distance between the outer diameter of the unlocking portion 221c and the inner end surface of the locking hole 2a should be smaller than the diameter of the locking component 23.

[0067] Please continue to refer to Figure 1 In this embodiment, a mounting hole extending in the axial direction is provided inside the shell 21, the inner end of the mounting hole is connected to the interior of the fuel filling pipe 1, and the outer end of the mounting hole passes through the end wall 21a of the shell 21. The valve stem 221 is installed inside the mounting hole. The valve stem 221 and the mounting hole are sealed along the circumferential direction and can slide within a preset range along the axial direction.

[0068] As described above, since the outer end of the mounting hole passes through the end wall 21a of the housing 21, the user can observe the position of the valve stem 221 from the outside, thereby judging whether the gas pressure inside the fuel filling pipe 1 is higher than the safety pressure threshold. Figure 1 As shown, in this embodiment, when the upper end surface of the valve stem 221 is flush with the outer side of the end wall 21a of the shell 21, the user is prompted that the internal gas pressure of the fuel filling pipe 1 is higher than the safety pressure threshold, and the fuel filler cap 2 is in a locked state; when the upper end surface of the valve stem 221 is flush with the inner side of the end wall 21a of the shell 21, the user is prompted that the internal gas pressure of the fuel filling pipe 1 is not higher than the safety pressure threshold, and the fuel filler cap 2 is in an unlocked state.

[0069] Of course, when the fuel filler cap 2 is in a locked or unlocked state, the position of the valve stem 221 is not limited to the above embodiment. For example, when the fuel filler cap 2 is in a locked state, the upper end of the valve stem 221 is exposed outside the housing 21, and when the fuel filler cap 2 is in an unlocked state, the valve stem 221 is completely located inside the housing 21. In general, the user can directly judge the locked or unlocked state of the fuel filler cap 2 by observing the relative position of the valve stem 221 and the end wall 21a of the housing 21, which provides a better user experience.

[0070] At the same time, in addition to the position observation function of the valve stem 221, after the outer end of the mounting hole passes through the end wall 21a of the shell 21, when a system failure requires emergency unlocking, there is no need to destroy or dismantle the mechanism to cause property loss. The valve stem 221 can be directly pressed down with items such as steel wire to make the valve stem 221 move downward, and the unlocking portion 221c moves to the position of the locking hole 2a. There is a gap between the locking component 23 and the valve stem 221. Under the action of the restoring force of the fuel filling pipe 1, the locking component 23 moves inward along the axis of the locking hole 2a, without hindering the normal engagement of the two threaded mating parts, and the fuel filler cap 2 can be opened normally for emergency unlocking.

[0071] Furthermore, since the outer end of the mounting hole passes through the end wall 21a of the housing 21, it is necessary to seal the valve stem 221 and the housing 21 to prevent fuel leakage, specifically:

[0072] An installation cavity 21b is provided inside the shell 21 for installing the valve stem 221. The inner end of the installation cavity 21b is an open end. The outer end wall of the installation cavity 21b is provided with a through hole o. The valve stem 221 includes a sealing section 221d. The sealing section 221d passes through the through hole o. The sealing section 221d is provided with an annular receiving groove c and also includes an annular sealing ring 222. The annular sealing ring 222 is installed in the annular receiving groove c. The sealing section 221d and the through hole o are circumferentially sealed by the annular sealing ring 222.

[0073] In this way, the fuel in the fuel filling pipe 1 can stay in the installation cavity 21 b under the blocking effect of the annular sealing ring 222 , and cannot leak from the end wall 21 a of the housing 21 .

[0074] It can be understood that the thickness of the outer end wall of the installation cavity 21b should ensure that when the valve stem 211 moves from the axial innermost end position to the axial outermost end position, the annular sealing ring 222 is always located inside the through hole o to ensure reliable sealing.

[0075] In this embodiment, the sealing section 221d is provided with an annular accommodating groove c, and the number of annular sealing rings 222 is one. In actual applications, the sealing section 221d can be provided with multiple annular accommodating grooves c, and the multiple annular accommodating grooves c are distributed at axial intervals along the sealing section 221d. The number of annular sealing rings 222 is also multiple, and the annular sealing rings 222 are installed one-to-one in the annular accommodating grooves c.

[0076] Meanwhile, in practical applications, the annular accommodating groove c can be arranged not only in the sealing section 221d, but also in the inner wall of the via o, or in both the sealing section 221d and the inner wall of the via o.

[0077] In addition, the annular sealing ring 222 is preferably made of fluororubber material, and the surface of the annular sealing ring 222 may be coated with fluororesin to increase the lubrication and wear resistance of the annular sealing ring 222 .

[0078] Furthermore, if Figure 1 As shown, in order to prevent the valve stem 221 from escaping from the mounting hole, the axial outermost end of the valve stem 221 includes a push rod portion 221e, and the end wall 21a of the shell 21 is provided with an observation hole a, which forms an axial partial structure of the mounting hole. The diameter of the push rod portion 221e gradually decreases from the inside to the outside, and the diameter of the inner end of the push rod portion 221e is larger than the inner diameter of the observation hole a, which is used to limit the maximum outward displacement of the valve stem 221.

[0079] The shape of the top rod portion 221e is preferably conical.

[0080] Of course, in practical applications, there are other ways to limit the maximum outward displacement of the valve stem 221, such as setting a step portion at a preset position of the push rod portion 221e. When the valve stem 221 moves to the maximum outward displacement, the step portion abuts against the inner side of the end wall 21a of the shell 21 to achieve position limiting.

[0081] Furthermore, if Figure 1 As shown, the pressure sensing component 22 further includes a guide ring 223 , which is installed inside the installation cavity 21 b , the valve stem 221 is movably inserted inside the guide ring 223 , and the peripheral wall of the locking portion 221 a fits the inner wall of the guide ring 223 .

[0082] In this way, the guide ring 223 can guide the valve stem 221, so that the valve stem 221 can always move along its axial direction without deviation, thereby ensuring reliable transmission.

[0083] There is no restriction on the installation method of the guide ring 223. For example, in the present embodiment, the inner wall of the installation cavity 21b is provided with a snap-fit ​​groove near the opening end, and the lower end of the guide ring 223 has a snap-fit ​​protrusion, which is snap-fitted into the snap-fit ​​groove, and the guide ring 223 is snap-fitted and fixed to the housing 21. Of course, in practical applications, the guide ring 223 and the inner wall of the installation cavity 21b are provided with matching threaded mating parts, and the threaded connection between the two is feasible.

[0084] Please continue to refer to Figure 1 In this embodiment, the valve stem 221 is provided with a step portion 221f at the inner end of the top rod portion 221e, and the step portion 221f is located on the upper side of the mounting cavity 21b. The pressure sensing component 22 also includes an elastic component 224, and the elastic component 224 is mounted on the valve stem 221. The elastic component 224 is located between the step portion 221f and the outer end wall of the mounting cavity 21b and is in an energy storage state.

[0085] As set above, the step portion 221f can play an axial limiting role on the elastic component 224. The elastic component 224 is pressed between the step portion 221f and the outer end wall of the installation cavity 21b, and always generates an upward elastic force. It can be understood that the elastic force is much smaller than the deadweight of the valve stem 221. By changing the stiffness of the elastic component 224, the relative position of the valve stem 221 can be adjusted to meet the installation requirements of the internal gas pressure of the fuel filling pipe 1 under different safety pressure thresholds. For example, in this embodiment, the safety pressure threshold is set to 2.5KPa. When the actual safety pressure threshold is less than 2.5KPa, the elastic component 224 with greater stiffness should be replaced; when the actual safety pressure threshold is greater than 2.5KPa, the elastic component 224 with less stiffness should be replaced.

[0086] Specifically, the elastic component 224 may be a coil spring.

[0087] The present invention also provides an automobile fuel filling system, comprising a fuel tank 4 and the above-mentioned automobile fuel filling device, in which the end of the fuel filling pipe 1 away from the fuel filler cap 2 is connected to the fuel tank 4;

[0088] It also includes a fuel tank isolation valve 5, a fuel tank exhaust pipeline 6 and a carbon canister 7. The fuel tank exhaust pipeline 6 is connected to the carbon canister 7 and the fuel tank 4. The fuel tank isolation valve 5 is arranged on the fuel tank exhaust pipeline 6. The fuel tank isolation valve 5 is in a normally closed state.

[0089] The refueling door 81, the refueling door lock 82, the door lock motor and the refueling door position sensor 83 are also included. The refueling door lock 82 is electrically connected to the door lock motor. The refueling door lock 82 is used to lock or unlock the refueling door 81. The refueling door position sensor 83 is used to detect the open or closed state of the refueling door 81.

[0090] It also includes a controller 9, which is electrically connected to the fuel tank isolation valve 5, the fuel filling door position sensor 83, and the door lock motor.

[0091] The automobile fuel filling system of the present invention includes the aforementioned automobile fuel filling device, and thus has the same technical effects as the automobile fuel filling device, which will not be described in detail herein.

[0092] The locking or unlocking control of the refueling door 81 is synchronously linked with the locking or unlocking of the four doors of the whole vehicle, that is, when the four doors of the whole vehicle are unlocked, the refueling door 81 is unlocked at the same time; when the four doors of the whole vehicle are locked, the refueling door 81 is locked at the same time.

[0093] The oil tank isolation valve 5 is in a normally closed state when there is no power supply. The oil tank isolation valve 5 is driven to open by the controller 9 according to the power supply demand, so that the oil tank exhaust pipeline 6 is in a pass state to achieve exhaust.

[0094] The present invention also provides a method for controlling a vehicle fuel filling system, which is applicable to the above-mentioned vehicle fuel filling system and comprises the following steps:

[0095] Step S1: When the actual vehicle speed is not higher than the preset vehicle speed and a door unlocking signal request is received, the refueling door lock 82 is driven to unlock;

[0096] Step S2: Detect the position state of the refueling door 81. If the position state of the refueling door 81 is open, enter the refueling scene, supply power to the fuel tank isolation valve 4, and the fuel tank isolation valve 4 is opened to intake and exhaust air;

[0097] Step S3: when the fuel filler cap 2 is in the unlocked state, opening the fuel filler cap 2 to refuel;

[0098] Step S4: When the preset conditions are met, exit the refueling scene, stop supplying power to the tank isolation valve 4, and close the tank isolation valve 4. The preset conditions include at least one of the following: detecting that the position state of the refueling door 81 is closed; the actual vehicle speed is higher than the preset speed; the time to enter the refueling scene is not less than the preset time.

[0099] The automobile fuel filling system control method of the present invention is applicable to the aforementioned automobile fuel filling system, and thus has the same technical effect as the aforementioned automobile fuel filling system, which will not be described in detail herein.

[0100] At the same time, the automobile fuel filling system and the automobile fuel filling system control method of the present invention are suitable for new energy vehicle models equipped with high-pressure fuel systems. They can reduce the parts involved in the whole vehicle fuel filling process, reduce the whole vehicle parts or decouple the whole vehicle parts association, so as to reduce the whole vehicle material and development costs, and at the same time shorten the fuel filling process judgment link, reduce the failure probability, and improve user convenience. They can simply, effectively, low-cost and systematically solve the safety problems caused by fuel filling scene recognition and high-pressure fuel vapor injection.

[0101] Among them, in step S1, if the actual vehicle speed is higher than the preset vehicle speed, the unlocking action of the fuel door lock 82 is not performed.

[0102] In step S2 , the position state of the refueling door 81 may be detected by the refueling door position sensor 83 .

[0103] At the same time, since the actual vehicle speed and the preset vehicle speed have been determined in step S1, the relationship between the actual vehicle speed and the preset vehicle speed is not directly stated in step S2. However, it can be understood that in step S2, it is also necessary to ensure that the actual vehicle speed is not higher than the preset vehicle speed before entering the refueling scene.

[0104] Among them, in step S3, the locked or unlocked state of the fuel filler cap 2 can be determined by observing the relative positions of the valve stem 221 and the end wall 21a of the shell 21. For example, when the system pressure is within the safety pressure threshold, the locking component 23 unlocks the fuel filler cap 2, and the valve stem 221 indicates that the fuel filler cap 2 is in the unlocked state; when the system pressure is higher than the safety pressure threshold, the locking component 23 locks the fuel filler cap 2, and the valve stem 221 indicates that the fuel filler cap 2 is in the locked state.

[0105] Among them, in step S3, only one of the preset conditions needs to be met to exit the refueling scene. For example, when the actual vehicle speed is higher than the preset vehicle speed, even if the position state of the refueling door 81 is detected to be open, the time to enter the refueling scene is less than the preset time, and the refueling scene is still exited, power supply to the tank isolation valve 4 is stopped, and the tank isolation valve 4 is closed.

[0106] In this embodiment, the preset vehicle speed is 15 km / h; the preset time is 30 minutes.

[0107] Of course, the above numerical limits are only for illustrative purposes and can be adaptively adjusted according to actual needs.

[0108] The above is a detailed introduction to a vehicle fuel filling device, a filling system and a control method provided by the present invention. The principle and implementation method of the present invention are described in detail using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A vehicle fuel filling device, comprising a fuel filling pipe (1) and a fuel filler cap (2), wherein the open end of the fuel filling pipe (1) forms a fuel filler port, and the fuel filler cap (2) is used to open or block the fuel filler port, characterized in that: The fuel filler cap (2) comprises a housing (21), a pressure sensing component (22) and a locking component (23); the pressure sensing component (22) and the locking component (23) are both installed inside the housing (21); the inner end of the pressure sensing component (22) is connected to the inside of the fuel filling pipe (1); the pressure sensing component (22) can move under the action of the internal gas pressure of the fuel filling pipe (1) and drive the locking component (23) to move; when the internal gas pressure of the fuel filling pipe (1) is higher than a safety pressure threshold, the locking component (23) is in a first position; when the internal gas pressure of the fuel filling pipe (1) is not higher than the safety pressure threshold, the locking component (23) is in a second position; When in the first position, the locking component (23) locks the fuel filler cap (2), and the fuel filler cap cannot be opened; when in the second position, the locking component (23) unlocks the fuel filler cap (2), and the fuel filler cap can be opened.

2. The automobile fuel filling device according to claim 1, characterized in that: The fuel filling pipe (1) and the housing (21) are provided with matching threaded fitting parts, the housing (21) is provided with a locking hole (2a), the locking hole (2a) is located in the area of ​​the threaded fitting part provided on the housing (21), the locking component (23) is partially located in the locking hole (2a), and the pressure sensing component (22) can drive the locking component (23) to move along the axial direction of the locking hole (2a); When in the first position, the locking component (23) squeezes the threaded mating portion arranged on the fuel filling pipe (1), the two threaded mating portions are abnormally engaged, and the fuel filler cap (2) cannot rotate normally to disengage from the fuel filling pipe (1); when in the second position, the locking component (23) loosens the fuel filling pipe (1), the two threaded mating portions are normally engaged, and the fuel filler cap (2) can rotate normally to disengage from the fuel filling pipe (1).

3. The automobile fuel filling device according to claim 2, characterized in that: The locking component is a spherical structure, the locking hole (2a) is a cylindrical hole, and the diameter of the locking hole (2a) is smaller than the diameter of the locking component (23).

4. The automobile fuel filling device according to claim 1, characterized in that: The pressure sensing component (22) comprises a valve stem (221), the inner end of the valve stem (221) is connected to the interior of the fuel filling pipe (1), the valve stem (221) can move axially under the action of the internal gas pressure of the fuel filling pipe (1), the valve stem (221) has a matching section (A), the locking component (23) and the peripheral wall of the matching section (A) are in contact with each other, The matching section (A) comprises a locking portion (221a), a transition connection portion (221b) and an unlocking portion (221c) which are sequentially connected from the inside to the outside, the diameter of the unlocking portion (221c) is smaller than the diameter of the locking portion (221a), and the diameter of the transition connection portion (221b) gradually decreases from the locking portion (221a) to the unlocking portion (221c). When the locking component (23) is in contact with the peripheral wall of the locking portion (221a), the locking component (23) is in the first position; when the locking component (23) is in contact with the peripheral wall of the unlocking portion (221c), the locking component (23) is in the second position.

5. The automobile fuel filling device according to claim 4, characterized in that: The shell (21) is provided with a mounting hole extending in the axial direction, the inner end of the mounting hole is connected to the inside of the fuel filling pipe (1), the outer end of the mounting hole passes through the end wall (21a) of the shell (21), the valve stem (221) is installed in the mounting hole, the valve stem (221) and the mounting hole are sealed in the circumferential direction, and can slide in a preset range in the axial direction.

6. The automobile fuel filling device according to claim 5, characterized in that: The shell (21) is provided with an installation cavity (21b) for installing the valve stem (221); the inner end of the installation cavity (21b) is an open end; the outer end wall of the installation cavity (21b) is provided with a through hole (o); the valve stem (221) includes a sealing section (221d); the sealing section (221d) passes through the through hole (o); at least one of the outer peripheral wall of the sealing section (221d) and the inner wall of the through hole (o) is provided with an annular sealing ring (222); the sealing section (221d) and the through hole (o) are circumferentially sealed by the annular sealing ring (222).

7. The automobile fuel filling device according to claim 6, characterized in that: The pressure sensing component (22) further comprises a guide ring (223), wherein the guide ring (223) is installed inside the installation cavity (21b), the valve stem (221) is movably inserted inside the guide ring (223), and the peripheral wall of the locking portion (221a) is in contact with the inner wall of the guide ring (223).

8. The automobile fuel filling device according to claim 5, characterized in that: The axial outermost end of the valve stem (221) includes a push rod portion (221e), and the end wall (21a) of the shell (21) is provided with an observation hole (a), and the observation hole (a) forms an axial partial structure of the mounting hole. The diameter of the push rod portion (221e) gradually decreases from the inside to the outside, and the diameter of the inner end of the push rod portion (221e) is larger than the inner diameter of the observation hole (a), so as to limit the maximum outward displacement of the valve stem (221).

9. The automobile fuel filling device according to claim 8, characterized in that: The valve stem (221) is provided with a step portion (221f) at the inner end of the push rod portion (221e), and the step portion (221f) is located on the outside of the installation cavity (21b). The pressure sensing component (22) also includes an elastic component (224), and the elastic component (224) is mounted on the valve stem (221). The elastic component (224) is located between the step portion (221f) and the outer end wall of the installation cavity (21b), and is in an energy storage state.

10. An automobile fuel filling system, characterized in that: It comprises a fuel tank (4), and the automobile fuel filling device according to any one of claims 1 to 9, wherein the end of the fuel filling pipe (1) away from the fuel filler cap (2) is connected to the fuel tank (4); It also comprises a fuel tank isolation valve (5), a fuel tank exhaust pipeline (6) and a carbon canister (7), wherein the fuel tank exhaust pipeline (6) is in communication with the carbon canister (7) and the fuel tank (4), the fuel tank isolation valve (5) is arranged on the fuel tank exhaust pipeline (6), and the fuel tank isolation valve (5) is in a normally closed state; It also includes a refueling door (81), a refueling door lock (82), a door lock motor and a refueling door position sensor (83), wherein the refueling door lock (82) and the door lock motor are electrically connected, the refueling door lock (82) is used to lock or unlock the refueling door (81), and the refueling door position sensor (83) is used to detect the open or closed state of the refueling door (81); It also includes a controller (9), and the controller (9) is electrically connected to the fuel tank isolation valve (5), the fuel filling door position sensor (83), and the door lock motor.

11. A method for controlling a vehicle fuel filling system, applicable to the vehicle fuel filling system according to claim 10, characterized in that: The steps include: Step S1: when the actual vehicle speed is not higher than the preset vehicle speed and a door unlocking signal request is received, driving the refueling door lock (82) to unlock; Step S2: Detect the position of the refueling door (81). If the refueling door (81) is If the position state is open, the refueling scene is entered, power is supplied to the fuel tank isolation valve (4), and the fuel tank isolation valve (4) is opened; Step S3: when the fuel filler cap (2) is in an unlocked state, opening the fuel filler cap (2) to refuel; Step S4: when a preset condition is met, the refueling scene is exited, power supply to the fuel tank isolation valve (4) is stopped, and the fuel tank isolation valve (4) is closed, wherein the preset condition includes at least one of the following: The position state of the refueling door (81) is detected to be closed; the actual vehicle speed is higher than the preset vehicle speed; and the duration of entering the refueling scene is not less than the preset duration.

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