KR101326797B1 - Fuel supply system for vehicle - Google Patents

Abstract

Exemplary embodiments of the present invention are a simple structure, i. The fuel tank having a filler pipe installed to be connected to an upper side of the fuel tank to inject fuel into the tank, and iii) a pipe-shaped valve body connected to the inner end of the fuel tank of the filler pipe. A shut-off valve which prevents the fuel injected therein from flowing back into the filler pipe, iii) a canister for sucking and supplying the evaporated gas inside the fuel tank to the intake system, iii) A leak diagnosis unit for detecting a fuel leak in the fuel supply system by detecting pressure, the valve body of the shut-off valve At least one vent hole is formed on the upper side to communicate the upper space inside the fuel tank and the upper space inside the filler pipe, and a one-way valve for selectively opening and closing the vent hole. Provided is a vehicle fuel supply device.

Fuel, supply, North America, leak diagnosis, evaporative gas, rear, collision

Description

Automotive Fuel Supply {FUEL SUPPLY SYSTEM FOR VEHICLE}

Exemplary embodiments of the present invention relate to a vehicle fuel supply device, and more particularly, a simple fuel structure for a vehicle fuel that satisfies all of the latest regulations regarding leak diagnosis, evaporative gas emission, and rear collision test in North America. It relates to a supply device.

In general, the fuel used in the vehicle is supplied to the cylinder of the engine in which combustion occurs by the fuel supply device, the fuel supply device 200, as shown in Figure 1 and 2, on one side of the fuel tank 110 The filler pipe 120 for injecting fuel into the fuel tank 110 is connected.

A shut off valve 130 connected to an inner end of the fuel tank 110 of the filler pipe 120 is installed inside the fuel tank 110, and the shut off valve 130 is provided. The fuel injected into the fuel tank 110 is prevented from flowing back into the filler pipe 120.

In addition, a canister 140 for recovering the evaporated gas inside the fuel tank 110 to an intake system (not shown) is installed at another side of the fuel tank 110.

In this case, the canister 140 is installed in communication with the inside of the fuel tank 110 through the suction pipe 141, and is connected to the intake system (not shown) through the gas discharge pipe 143.

The canister 140 is provided with a connecting pipe 145 connected to the atmosphere side, and the connecting pipe 145 is mounted at an end thereof with an air filter 147 having a conventional structure.

In addition, the fuel supply apparatus 200 according to the prior art may diagnose the leakage of fuel and evaporated gas of the fuel supply system in order to satisfy the North American On Board Diagnosis-2 (ODB-2) regulation. It is done as a structure.

That is, the fuel supply device 200 opens a purge control solenoid valve (PCSV) 171 installed in the gas discharge pipe 143 and a canister close valve installed in the connection pipe 145. : CCV (173) is closed to form a negative pressure in the fuel supply system by detecting the pressure of the fuel supply system through the pressure sensor 175 installed in the suction pipe 141, based on the pressure of the electronic control unit ( ECU 177 enables diagnosis of fuel and evaporative gas leaks in the fuel supply system.

However, in the fuel supply apparatus 200 according to the related art, when the fuel is filled in the fuel tank 110 with approximately 50% or more, the end of the shut-off valve 130 is immersed in the fuel and the fuel tank 110. Negative pressure (pressure) inside the) is not transmitted to the inside of the filler pipe 120, it is impossible to perform a fuel and evaporative gas leakage diagnosis of the filler pipe 120.

Accordingly, the fuel supply apparatus 200 according to the related art includes a leak detection tube 181 interconnecting an upper space inside the fuel tank 110 and an upper space inside the filler pipe 120.

In addition, on the flow path of the leak detection tube 181, in response to North American On Board Refuelling Vapor Recovery (ORVR) regulations, evaporation gas in the fuel tank 110 is discharged to the atmosphere through the leak detection tube 181 when fuel is refueled. The one-way valve 185 is installed to prevent the case.

However, according to the fuel supply apparatus 200 according to the related art, as described above, as the fuel tank 110 and the filler pipe 120 are separately provided with the leak detection tube 181, the newly established North American There is a problem of not being able to actively respond to the rear crash test regulations.

That is, when the rear collision of the vehicle, the leak detection tube 181 is squeezed and damaged by the vehicle body, so that fuel leakage occurs. Accordingly, the result of failing to satisfy the recently strengthened North American rear crash test regulations is found. Will result.

In addition, in the related art, as described above, the leakage sensing tube 181 connecting the fuel tank 110 and the filler pipe 120 and the one-way valve 185 on the tube 181 are separately provided. Due to the excessive number of connections, the path through which the boil-off gas inside the fuel tank 110 can be released into the atmosphere is increased, and as a result, the North American ORVR regulations are not satisfied.

In addition, in the related art, since the leak detection tube 181 and the one-way valve 185 are separately provided, the material cost and the production cost increase due to the addition of parts, and the structure of the entire apparatus becomes complicated, and the production is performed. There is also a problem that the assembly and workability of the line is reduced.

Accordingly, an exemplary embodiment of the present invention is to provide a simple structure by eliminating the leak detection tube for leak diagnosis of the filler pipe, forming a vent hole on the upper side of the shut-off valve, and installing a one-way valve. It is an object of the present invention to provide a fuel supply for a vehicle that can satisfy all the regulations on leakage diagnosis, evaporative gas emission and rear collision test.

A vehicle fuel supply apparatus according to an exemplary embodiment of the present invention for achieving the above object includes: i) a fuel tank for storing fuel; and ii) the fuel tank for injecting fuel into the fuel tank. A filler pipe installed to be connected to an upper one side of the filler pipe; and iii) the fuel injected into the fuel tank has a valve body in the form of a pipe connected to an inner end of the fuel tank; A shut-off valve that prevents the engine from being prevented, iii) a canister for sucking and supplying the evaporated gas inside the fuel tank to the intake system, and iii) detecting the pressure inside the fuel tank to diagnose fuel leakage of the fuel supply system. And a leakage diagnosis unit, wherein the valve body upper side of the shut-off valve has an upper space inside the fuel tank. At least one vent hole for mutually communicating an upper side space in the filler pipe is formed, it consists of a configuration that the one-way valve for selectively opening and closing the vent hole is installed.

In the vehicle fuel supply device, the one-way valve is installed in the valve body through a valve hole formed on the outside of the vent hole, it may be configured to open the vent hole by the negative pressure inside the fuel tank. .

In the vehicle fuel supply device, the one-way valve has a valve head for opening and closing the vent hole, the valve head is integrally formed with a valve stem fitted into the valve hole, the front end of the valve stem A stopper may be formed for regulating the release of the valve stem from the valve hole.

In this case, the vent hole is preferably formed having a diameter of 2-3 mm.

According to the fuel supply device for a vehicle according to the exemplary embodiment of the present invention as described above, as shown in the prior art, the leak detection tube for the leakage diagnosis of the filler pipe is deleted, and a vent hole is formed above the shut-off valve. By installing a one-way valve, it has a simple structure, and can satisfy all of the latest regulations for leak diagnosis, evaporative gas emission, and back collision test in North America.

In addition, in the present embodiment, by deleting the leak detection tube as in the prior art, the number of work is reduced, the working space of the filler pipe can be secured, the assembly and workability of the production line is further improved, the structure of the entire apparatus Is simplified, and production cost and material cost can be reduced.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

3 is a perspective view showing the configuration of a vehicle fuel supply apparatus according to an exemplary embodiment of the present invention, Figure 4 is a block diagram schematically showing a vehicle fuel supply apparatus according to an exemplary embodiment of the present invention.

Referring to the drawings, the vehicle fuel supply apparatus 100 according to the present embodiment has recently established North American OBD-2 (On Board Diagnosis-2) regulation and ORVR (On Board Refuelling Vapor Recovery). : Actively comply with the regulations of preventing the release of evaporated gas into the air during fueling) and the provision of the rear collision test (prevention of fuel leakage due to impact of the vehicle body in the rear collision).

This fuel supply 100 is a separate leak detection tube (commonly known in the art as a "pressure delivery tube" or installed in connection with the fuel tank and the filler pipe for detecting fuel and evaporative gas leakage inside the filler pipe as conventionally And a " breather pipe ") to satisfy the above-mentioned rear collision test regulations and to satisfy OBD-2 and ORVR regulations.

The configuration of the vehicle fuel supply device 100 according to the present embodiment is provided with a fuel tank 10 for storing fuel, the upper side of the fuel tank 10 to the fuel to the interior of the fuel tank 10 A filler pipe 20 (in the art, commonly referred to as a "filler neck") for injecting is provided.

The filler pipe 20 is mounted to be connected to the fuel tank 10 in a state of being upwardly adjusted to the upper portion of the fuel tank 10, and a filler cap 21 is installed at an end side corresponding to the fuel inlet of the vehicle.

A shut off valve may be provided at an inner end of the fuel tank 10 to prevent the fuel injected into the fuel tank 10 from flowing back into the filler pipe 20. : 30) is installed to be connected.

In this case, the shut-off valve 30 is preferably made of a plastic material.

The shut-off valve 30 is provided with a valve body 31 in the form of a pipe which is connected to the end of the filler pipe 20 and located inside the fuel tank 10, as shown in FIG. At the free end of the body 31, a valve unit 33 for blocking the outflow of fuel is installed.

Since the shut-off valve 30 is made of a shut-off valve of a known technique widely used in the art, a detailed description of the detailed configuration will be omitted herein.

On the other side of the fuel tank 10, a canister 40 for recovering the evaporated gas inside the fuel tank 10 to an intake system (not shown) is provided.

The canister 40 absorbs and stores evaporated gas from the fuel tank 10 when the engine is not driven, and when the engine is started and reaches a predetermined driving condition, the canister 40 stores the stored evaporated gas together with the outside air by the intake negative pressure (not shown). ) Will lead to the function.

The canister 40 is installed in communication with the inside of the fuel tank 10 through the suction pipe 41, and is installed to be connected to the rear of the throttle valve of the intake system (not shown) through the gas discharge pipe 43.

That is, the fuel evaporation gas generated by the natural evaporation of the fuel in the fuel tank 10 is sucked into the canister 40 through the suction pipe 41, the gas when the outside air is sucked through the intake system (not shown) The negative pressure acting as the canister 40 through the discharge pipe 43 is supplied to the cylinder of the engine (not shown) together with the outside air.

The canister 40 is provided with a connecting pipe 45 connected to the atmosphere side, and the connecting pipe 45 is mounted at an end thereof with an air filter assembly 47.

The air filter assembly 47 filters the air discharged into the atmosphere through the connecting pipe 45 while the boil-off gas generated in the fuel tank 10 enters the canister 40 and is adsorbed and stored when the engine is not driven. During operation, the air flowing into the canister 40 is filtered through the connection pipe 45 by the intake negative pressure.

In the fuel supply device 100 according to the present embodiment configured as described above, the upper side of the valve body 31 of the shut-off valve 30, as shown in FIG. 5, the upper side of the inside of the fuel tank 10. A plurality of vent holes 39 are formed to communicate the space with the upper space inside the filler pipe 20, and a one way valve 50 for selectively opening and closing the vent holes 39. Is installed.

The vent holes 39 are formed at a height of 92% of the nominal capacity of the fuel tank 10 in the valve body 31 of the shut-off valve 30, and the valve holes 51 described further below. Is formed radially on the outside of the center.

These vent holes 39 communicate the upper space inside the fuel tank 10 and the upper space inside the filler pipe 20 to communicate with the fuel tank 10 through the leak diagnosis unit 70 which will be described later. And checking the pressure inside the filler pipe 20 to detect leakage of fuel and boil-off gas of the fuel supply system to the outside.

In this case, the vent holes 39 may be formed as a diameter of 2 to 3 mm.

In this embodiment, the one-way valve 50 opens the vent holes 39 of the shut-off valve 30 when a negative pressure is generated in the fuel tank 10, and a positive pressure is applied to the fuel tank 10. When generated, it is made as a one-way valve capable of closing the vent holes 39 by the above-mentioned positive pressure.

The one-way valve 50 is connected to the valve body 31 of the shut-off valve 30 through a valve hole 51 formed at an outer side of the vent holes 39, that is, at a radial center of the vent holes 39. Is mounted.

The one-way valve 50 is provided with a dome-shaped valve head 53 for opening and closing the vent holes 39, the valve head 53 is fitted with a valve stem (51) 55 is integrally formed, and a stopper 57 is formed at the tip of the valve stem 55 to prevent the valve stem 55 from escaping from the valve hole 51.

Therefore, when negative pressure is generated in the fuel tank 10, the valve head 53 is lifted by the negative pressure to open the vent holes 39, and when positive pressure is generated in the fuel tank 10. The positive pressure causes the valve head 53 to return to its original position to close the vent holes 39.

On the other hand, the fuel supply device 100 according to the present embodiment further includes a leak diagnosis unit 70 for detecting the negative pressure of the fuel supply system to diagnose the leakage of fuel and boil off gas of the fuel supply system. .

The leak diagnosis unit 70 connects the purge control solenoid valve (PCSV) 71 installed on the flow path of the gas discharge pipe 43 to the canister 40 and the air filter assembly 47. Canister Close Valve (CCV) 73 installed on the flow path of the connecting pipe 45, a pressure sensor 75 mounted on the suction pipe 41 to sense the pressure of the fuel supply system, and a purge control And an electronic control unit (ECU) 77 in electrical communication with the solenoid valve 71, the canister shutoff valve 73, and the pressure sensor 75.

The purge control solenoid valve 71 closes the gas discharge pipe 43 when the evaporated gas inside the fuel tank 10 is absorbed and stored in the canister 40 when the engine is not driven, and is stored in the canister 40 when the engine is driven. When the evaporated gas is supplied to the intake system (not shown) together with the outside air, the gas discharge pipe 43 is opened.

The canister shutoff valve 73 basically opens the connecting pipe 45 at all times when the engine is driven or the engine is not driven, and a negative pressure is applied to the inside of the fuel tank 10 in the fuel and evaporative gas leakage diagnosis mode of the fuel supply system. It will function to close the connecting pipe 45 for a short time (about 30 seconds) to be generated.

In addition, the electronic control unit 77 controls the operation of the purge control solenoid valve 71 and the canister shutoff valve 73, receives a detection signal from the pressure sensor 75, and sets the internal pressure of the fuel supply system and a predetermined reference. The pressure is compared to determine the leakage of fuel and evaporated gas in the fuel supply system.

Referring to the operation of the vehicle fuel supply device 100 according to an exemplary embodiment of the present invention configured as described above are as follows.

First, when the engine is not driven, the purge control solenoid valve 71 is controlled by the electronic control unit 77 to close the gas discharge pipe 43, and the canister shutoff valve 73 is controlled by the electronic control unit 77. The connecting pipe 45 is opened.

Accordingly, the evaporated gas generated in the fuel tank 10 flows into the canister 40 and is adsorbed and stored in the canister 40, and the air in the canister 40 is connected to the connecting pipe 45 and the air filter assembly. Through 47 is released into the atmosphere.

When the engine is driven, the purge control solenoid valve 71 is controlled by the electronic control unit 77 to open the gas discharge pipe 43, and the canister shutoff valve 73 is controlled and connected by the electronic control unit 77. Open the pipe 45.

Accordingly, the boil-off gas stored in the canister 40 is separated by fresh outside air introduced into the canister 40 through the air filter assembly 47 and the connecting pipe 45, and by the intake negative pressure together with the outside air. It is sent to the intake system (not shown) through the gas discharge pipe 43 and is burned in the combustion chamber.

In this case, the valve head 53 of the one-way valve 50 is opened by the intake negative pressure in the fuel tank 10 to open the vent holes 39 (see FIG. 6).

Then, the boil-off gas in the filler pipe 20 is introduced into the fuel tank 10 through the vent holes 39.

On the contrary, when the gas discharge pipe 43 is closed by the purge control solenoid valve 71 as described above, the valve head 53 is returned to its original position by the positive pressure inside the fuel tank 10, and the vent holes (39) will be closed.

On the other hand, when fueling the fuel into the fuel tank 10, since the valve head 53 of the one-way valve 50 maintains the above-described vent holes 39, the fuel tank 10 Evaporating gas inside is not released to the atmosphere.

Therefore, in the present embodiment, it is possible to actively respond to North American On-board Refuelling Vapor Recovery (ORVR) regulations.

On the other hand, in the leak diagnosis mode for diagnosing the leakage of fuel and evaporated gas of the fuel supply system while the vehicle is running in the present embodiment, first, the canister shutoff valve 73 is controlled by the electronic control unit 77 to connect the connecting pipe. Close 45. The canister 40 and the atmosphere are then blocked from each other.

And the purge control solenoid valve 71 is controlled by the electronic control unit 77 to open the gas discharge pipe 43 for a predetermined time.

Accordingly, the intake negative pressure is formed in the fuel tank 10 by an intake system (not shown). That is, the fuel supply system maintains the vacuum state as a whole, and the pressure sensor 75 detects the pressure at this time and outputs the detection signal to the electronic control unit 77.

Then, the electronic control unit 77 compares the pressure of the fuel supply system with a preset reference pressure and determines that there is no leakage of fuel and evaporated gas in the fuel supply system when the pressure inside the fuel supply system drops below the reference pressure. In other words, when the pressure in the fuel supply system does not fall below the reference pressure, it is determined that there is a leakage of fuel and evaporated gas in the fuel supply system.

In this case, the valve head 53 of the one-way valve 50 opens the vent holes 39 while being lifted by the negative pressure inside the fuel tank 10, as shown in FIG. 6.

Then, since the internal pressure of the filler pipe 20 can be checked as described above, the leakage diagnosis unit 70 according to the present embodiment also determines whether the filler pipe 20 leaks fuel and evaporated gas. You can do it.

Therefore, in the present embodiment, it is possible to satisfy North American OBD-2 (On Board Diagnosis-2) regulation.

In addition, in the present embodiment, a leak detection tube separately installed for leak detection of the filler pipe 20 is removed as in the related art, and a vent hole 39 is formed in the valve body 31 of the shut-off valve 30. As a result, while meeting the OBD-2 and ORVR regulations of North America as described above, it is possible to actively respond to the rear crash test regulations.

In addition, in the present embodiment, by eliminating the leak detection tube as in the prior art, the number of work is reduced, the working space of the filler pipe can be secured, so that the assembly and workability of the production line can be further improved. The structure can be simplified, and production costs and material costs can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.

1 is a perspective view showing the configuration of a vehicle fuel supply apparatus according to the prior art.

2 is a block diagram schematically illustrating a configuration of a vehicle fuel supply apparatus according to the prior art.

3 is a perspective view illustrating a configuration of a vehicle fuel supply apparatus according to an exemplary embodiment of the present invention.

4 is a block diagram schematically illustrating a vehicle fuel supply apparatus according to an exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating the shut-off valve shown in FIG. 3.

6 is a cross-sectional configuration diagram of a shut-off valve for explaining the operation of the vehicle fuel supply device according to an exemplary embodiment of the present invention.

Claims (4)

A fuel tank 10 for storing fuel; A filler pipe 20 installed to be connected to an upper side of the fuel tank 10 to inject fuel into the fuel tank 10; The fuel injected into the fuel tank 10 has a valve body 31 in the form of a pipe connected to an inner end of the fuel tank 10 to the filler pipe 20. A shut-off valve 30 to prevent backflow; A canister (40) for sucking and supplying the evaporated gas inside the fuel tank (10) to the intake system; And It includes a leak diagnosis unit 70 for detecting the fuel leakage of the fuel supply system by detecting the pressure in the fuel tank 10, At least one vent hole 39 which communicates with an upper space inside the fuel tank 10 and an upper space inside the filler pipe 20 at an upper side of the valve body 31 of the shut-off valve 30. ) Is formed, the vent hole 39 may be opened when a negative pressure is generated in the fuel tank 10, and the vent hole 39 may be closed by the positive pressure when the positive pressure is generated in the fuel tank 10. One-way valve 50 is installed, The one-way valve 50 is installed in the valve body 31 through a valve hole 51 formed outside the vent hole 39, and the vent hole is formed by a negative pressure inside the fuel tank 10. And a valve head 53 configured to open and close the vent hole 39. The valve head 53 has a valve stem 55 fitted into the valve hole 51. And a stopper (57) formed integrally with the stop of the valve stem (55) from the valve hole (51) at the tip of the valve stem (55). delete delete The method according to claim 1, A vehicle fuel supply device in which the vent hole 39 is formed as a diameter of 2 to 3 mm.

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