KR20230124174A - Canister module for vehicle - Google Patents

Abstract

In the present invention, in addition to an air nipple capable of communicating with the outside air, an auxiliary air nipple having a smaller diameter is formed in the canister, a 3-way solenoid valve is mounted on the air nipple, and a hose for inducing resistance is connected between the auxiliary air nipple and the 3-way solenoid valve. Therefore, by controlling the 3-way solenoid valve to turn on or off to adjust the external emission of boil-off gas according to the internal temperature and pressure conditions of the fuel tank, the canister module for automobiles can minimize the external emission of fuel boil-off gas that was intended to provide.

Description

Automotive canister module {CANISTER MODULE FOR VEHICLE}

The present invention relates to a canister module for a vehicle, and more particularly, to a canister module for a vehicle capable of minimizing the amount of external emission of fuel boil-off gas.

Evaporation gas is generated from the fuel filled in the fuel tank of the vehicle due to environmental factors such as ambient temperature. At this time, the evaporation gas contains harmful components (HC, etc.), so when released to the outside of the vehicle, it causes air pollution. In addition, boil-off gas causes unnecessary fuel consumption.

In order to solve this problem, as one component of a fuel supply system for a vehicle, a canister is provided at a predetermined position at the upper end of the fuel tank to collect boil-off gas and then purged the collected boil-off gas to be combustible with the engine using engine negative pressure. is fitted

1 is a perspective view showing the appearance of a conventional canister, and FIG. 2 is a schematic diagram showing the arrangement and connection relationship of a conventional canister.

As shown in FIGS. 1 and 2, the canister 20 includes a loading nipple 21 into which boil-off gas (in particular, HC gas) generated in the fuel tank flows, and the boil-off gas collected in the canister 20 to the engine A purge nipple 22 for purging the intake system and an air nipple 23 for discharging boil-off gas greater than the standard collection capacity collected in the canister 20 to the outside are formed.

In addition, a gas inlet pipe 11 extending from the fuel tank 10 is connected to the loading nipple 21 of the canister 20, and a gas purge pipe extending to the engine intake system 30 is connected to the purge nipple 22. A pipe 12 is connected, and a gas discharge pipe 13 is connected to the air nipple 23 for discharging boil-off gas exceeding a standard capacity to the outside.

In addition, the gas discharge pipe 13 connected to the air nipple 23 includes a canister closed valve 14 that is opened and operated by a controller when external discharge of boil-off gas is required, and to prevent foreign substances from outside air from penetrating into the canister. An air filter (15) for

At this time, the loading nipple 21 of the canister 20 is applied in a small size (eg, φ8) to prevent a large amount of boil-off gas (eg, HC gas) from flowing in from the fuel tank 10, and the The purge nipple 22 is applied to the middle side (eg, φ10) to increase the purge efficiency through resistance reduction, and the air nipple 23 is applied when an abnormal pressure is generated in the fuel tank 10 (eg, excessive engine pressure in the fuel tank). It is applied in a large size (eg, φ16) to quickly restore pressure when negative pressure is applied or when excessive static pressure in the fuel tank occurs).

Therefore, after the evaporation gas of the fuel filled in the fuel tank 10 is absorbed and collected by activated carbon (not shown) in the canister 20 through the gas inlet pipe 11 and the loading nipple 21, the engine When the negative pressure is applied, it is purged and burned by the engine through the gas purge pipe 12 and the intake system 30, thereby preventing external emission of boil-off gas and unnecessary fuel consumption.

On the other hand, when the vehicle is driven at high temperature and high altitude conditions, when the internal temperature and pressure of the fuel tank 10 rise due to external heat such as engine heat and exhaust heat as well as geothermal heat, the fuel filled in the fuel tank 10 As the amount of boil-off gas increases, boil-off gas exceeding the standard collection capacity may flow into the canister 20 .

Accordingly, as the canister closed valve 24 is controlled to be opened by the controller, evaporation gas exceeding the standard collection capacity of the canister 20 may be discharged to the outside through the gas discharge pipe 13 .

Furthermore, in order to relieve the excessive negative pressure of the engine from acting on the fuel tank, the canister closed valve 24 is controlled to open so that outside air flows into the canister 20, or the fuel tank 10 When the canister closed valve 14 is controlled to open in order to relieve the occurrence of excessive static pressure inside, the evaporation gas collected in the canister 20 can be released to the outside, so that more evaporation gas in addition to the evaporation gas exceeding the standard collection capacity A positive amount of evaporation gas may be released to the outside.

If such a large amount of evaporative gas (especially HC gas) is emitted to the outside, not only does the evaporative gas emission regulation not be satisfied, but the evaporative gas emitted to the outside causes a smell of fuel that can be recognized by the driver getting off for refueling. occurs, and problems that cause air pollution are followed.

The present invention has been made to solve the above conventional problems, forming an auxiliary air nipple of a smaller diameter in addition to an air nipple that can communicate with the outside air in the canister, mounting a three-way solenoid valve on the air nipple, and air By connecting the auxiliary nipple and the 3-way solenoid valve with a resistance induction hose, the fuel evaporates by controlling the 3-way solenoid valve to turn on or off to adjust the external emission of boil-off gas according to the internal temperature and pressure conditions of the fuel tank. An object of the present invention is to provide a canister module for a vehicle capable of minimizing the amount of gas emitted to the outside.

In order to achieve the above object, the present invention includes: an air nipple mounted on a boil-off gas discharge portion of a canister; an auxiliary air nipple provided with a smaller diameter than the air nipple and spaced apart from the air nipple at the evaporative gas discharge portion of the canister; a three-way solenoid valve having a first opening/closing port connected to the air nipple, a second opening/closing port connected to the air auxiliary nipple, and an outside air port communicating with outside air; a resistance induction hose connected between the air auxiliary nipple and the second opening/closing port; and a controller for controlling the 3-way solenoid valve to be turned on to communicate the auxiliary air nipple and the outside air port, or to control the 3-way solenoid valve to be turned off to communicate the air nipple and the outside air port. It provides a canister module for a vehicle, characterized in that configured to include.

In addition, the hose for inducing resistance and the second opening/closing port are characterized in that they are provided with the same diameter as the auxiliary air nipple or a smaller diameter than the air nipple.

In addition, it is characterized in that a check valve for allowing only the flow of evaporation gas from the air auxiliary nipple to the three-way solenoid valve is mounted inside the resistance induction hose.

Preferably, the air nipple and the auxiliary air nipple are integrally injected into the evaporative gas discharge unit of the canister or manufactured as a separate molded product and mounted therein.

The controller is characterized in that it is configured to receive a detection signal for determining on or off control of the 3-way solenoid valve from a fuel tank pressure sensor, an outside air temperature sensor, a vehicle speed sensor, and a fuel sender.

The controller determines that the fuel tank pressure exceeds the reference pressure or the outside temperature exceeds the reference temperature based on the detection signals of the fuel tank pressure sensor and the outside air temperature sensor, and the vehicle is stopped based on the detection signal of the vehicle speed sensor. When it is determined that it is, characterized in that configured to control the three-way solenoid valve to be on.

When the three-way solenoid valve is controlled by the controller to turn on, the air nipple of the canister is blocked from outside air and at the same time, the air auxiliary nipple is turned off by the check valve to enable OBD diagnosis to diagnose whether or not engine negative pressure has acted on the fuel tank. It is characterized in that it is blocked with.

The controller may be configured to maintain the 3-way solenoid valve in an off state or control the 3-way solenoid valve to be turned off from an on state when it is determined that the vehicle is in a driving state based on a detection signal of the vehicle speed sensor.

The controller is configured to control the three-way solenoid valve to be off when it is determined that fuel is being refueled in the fuel tank based on the detection signal of the fuel sender.

The controller may be configured to control the three-way solenoid valve to be turned on when it is determined that the fuel is fully refueled in the fuel tank based on the detection signal of the fuel sender.

Through the means for solving the above problems, the present invention provides the following effects.

First, when the internal temperature and pressure of the fuel tank are above a certain level, the 3-way solenoid valve is turned on to allow the canister's auxiliary air nipple to communicate with the outside air, thereby minimizing the amount of evaporation gas emitted to the outside and excessive emission of evaporation gas. It can prevent the smell of fuel.

Second, by allowing the air nipple of the canister to communicate with outside air in the off state of the three-way solenoid valve, abnormal pressure in the fuel tank (e.g., excessive engine negative pressure acting on the fuel tank or excessive positive pressure in the fuel tank) can be resolved.

Third, in the on state of the 3-way solenoid valve, the air nipple of the canister is blocked from the outside air and the auxiliary air nipple is blocked from the outside air by the check valve, thereby diagnosing whether or not the negative pressure of the engine acts on the fuel tank. OBD (On Board Diagnostics) diagnosis can be easily performed.

Fourth, when refueling the fuel tank, the three-way solenoid valve is controlled to be off to allow the air nipple of the canister to communicate with the outside air, so that the pressure in the fuel tank for smooth injection of fuel can be easily relieved, and fuel pool refueling. When the 3-way solenoid valve is turned on, the auxiliary air nipple of the canister communicates with outside air, thereby preventing an over-injection of fuel.

Fifth, since the canister closed valve and air filter mounted on the gas discharge pipe side of the existing canister are unnecessary, the number of parts can be reduced.

1 is a perspective view showing the appearance of a conventional canister;
2 is a schematic diagram showing the arrangement and connection relationship of a conventional canister;
3 is an enlarged partially exploded perspective view showing a canister module for a vehicle according to the present invention;
4 is a partially enlarged assembled perspective view showing a canister module for a vehicle according to the present invention;
5 is a schematic diagram showing the arrangement and connection relationship of a canister module for a vehicle according to the present invention;
6 is an enlarged cross-sectional view of a main part showing that the discharge of boil-off gas is minimized in the on state of the three-way solenoid valve of the canister module for a vehicle according to the present invention;
7 and 8 are enlarged cross-sectional views showing that the abnormal pressure in the fuel tank is relieved in the off state of the 3-way solenoid valve of the canister module for a vehicle according to the present invention;
9 and 10 are views showing that ODB diagnosis related to engine negative pressure is made in the on state of the three-way solenoid valve of the canister module for a vehicle according to the present invention;
11 is a control flow chart for minimizing evaporation gas emissions of a canister module for a vehicle according to the present invention;
12 is a control flow chart during fuel refueling of a canister module for a vehicle according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 show the canister module for a vehicle according to the present invention, and FIG. 5 shows the arrangement and connection relationship of the canister module for a vehicle according to the present invention.

3 to 5, the canister 20 includes a loading nipple 21 into which evaporation gas (in particular, HC gas) generated in the fuel tank 10 flows, and evaporation collected in the canister 20 The purge nipple 22 for purging gas into the engine intake system 30 and the boil-off gas discharge part 26 of the canister 20 are used to discharge boil-off gas greater than the standard collection capacity collected in the canister 20 to the outside. An air nipple 23 is formed for

In addition to the air nipple 23, an auxiliary air nipple 24 is formed in the boil-off gas discharge unit 26 of the canister 20.

More specifically, the auxiliary air nipple 24 is provided with a smaller diameter than the air nipple 23 so as to serve as a resistance when discharging the evaporation gas, so that the evaporation gas discharge portion 26 of the canister 20 It is formed at a position spaced apart from the air nipple 23 at a predetermined distance.

Preferably, the air nipple 23 and the auxiliary air nipple 24 are integrally injected into the evaporative gas emission part 26 of the canister 20, or are manufactured as separate molded products to evaporate the canister 20. It can be mounted on the gas discharge unit 26 .

Referring to FIG. 5, a gas inlet pipe 11 extending from the fuel tank 10 is connected to the loading nipple 21 of the canister 20, so that the fuel boil-off gas in the fuel tank 10 passes through the gas inlet pipe ( 11) and the loading nipple 21 can be adsorbed and collected by activated carbon (not shown) in the canister 20, and the purge nipple 22 has a gas purge pipe extending to the engine intake system 30 ( 12) is connected, the boil-off gas collected in the canister 20 can be purged to the engine intake system 30 through the purge nipple 22 and the gas purge pipe 12.

In particular, a three-way solenoid valve 40 is mounted between the air nipple 23 and the auxiliary air nipple 24, and the three-way solenoid valve 40 is communicatively connected to the air nipple 23 It is provided with a structure having a first opening/closing port 41, a second opening/closing port 42 communicatively connected to the air auxiliary nipple 24, and an outside air port 43 communicating with outside air, and the controller 60 ) is turned on or off by the control signal.

The controller 60 connects the air auxiliary nipple 24 and the outside air port 43 and at the same time uses the 3-way solenoid valve 40 to block the air nipple 23 and the outside air port 43. On control, or off control of the 3-way solenoid valve 40 in order to communicate between the air nipple 23 and the outside air port 43 and at the same time block the air auxiliary nipple 24 and the outside air port 43. is configured to

To this end, the controller 60 includes the three-way solenoid from the fuel tank pressure sensor 61, the outside air temperature sensor 62, the vehicle speed sensor 63, and the fuel sender 64 that detects the fuel level in the fuel tank. It is configured to receive a detection signal for determining on or off control of the valve 40.

At this time, a resistance induction hose 50 is connected between the air auxiliary nipple 24 and the second opening/closing port 42 of the three-way solenoid valve 40 to act as a resistance when evaporating gas is discharged.

Preferably, the auxiliary air nipple 24 is not only provided with a smaller diameter than the air nipple 23 so that it can play a resistance role when discharging the evaporation gas, but also the resistance induction hose 50 and the three-way The second opening/closing port 42 of the solenoid valve 40 is also provided with the same diameter as the auxiliary air nipple 24 or a smaller diameter than the air nipple 23 so as to serve as a resistance when discharging the boil-off gas.

On the other hand, a check valve 52 that allows only the flow of evaporation gas from the auxiliary air nipple 24 to the three-way solenoid valve 40 is mounted inside the hose 50 for resistance induction.

Here, the operation flow of the canister module of the present invention having the above configuration will be reviewed.

6 is an enlarged cross-sectional view of main parts showing that the discharge of boil-off gas is minimized in the on state of the three-way solenoid valve of the canister module for a vehicle according to the present invention.

6, the three-way solenoid valve 40 may be turned on by the current control signal of the controller 60 under a vehicle stop condition, that is, a vehicle speed non-detection condition of the vehicle speed sensor 63, etc. .

When the three-way solenoid valve 40 is turned on, as is well known, the plunger 44 present inside the three-way solenoid valve 40 compresses the spring 45 by its magnetic force and is pulled downward. As a result, the second opening/closing port 42 and the outside air port 43 of the three-way solenoid valve 40 communicate with each other while the first opening/closing port 41 is sealed.

More specifically, the second opening/closing port 42 and the outside air port 43 communicate with each other by the on-operation of the three-way solenoid valve 40, so that the air auxiliary nipple 24 and the resistance induction hose ( 50) and the second opening/closing port 42 are in communication with the atmosphere through the outside air port 43, and at the same time, the first opening/closing port 41 connected to the air nipple 23 is connected to the plunger 44. As the air nipple 23 is sealed, the outlet of the air nipple 23 is blocked to maintain airtightness.

Therefore, the evaporation gas exceeding the standard collection capacity from the canister 20 is not discharged through the air nipple 23 as in the past, and as indicated by the arrow in FIG. 6, the auxiliary air nipple 24 and resistance induction It may be discharged to the outside air through the hose 50, the second opening/closing port 42, and the outside air port 43 in turn.

As above, when the boil-off gas is released to the outside air, the auxiliary air nipple 24 having a smaller diameter than the air nipple 23 serves as a resistance when the boil-off gas is discharged, and together with the resistance induction hose 50 The two opening/closing ports 42 also play a role of resistance during discharge of the boil-off gas, thereby minimizing the amount of external discharge of the boil-off gas and preventing the smell of fuel due to excessive discharge of the boil-off gas.

7 and 8 are enlarged cross-sectional views showing that the abnormal pressure in the fuel tank is relieved in the off state of the 3-way solenoid valve of the canister module for a vehicle according to the present invention.

Based on the detection signal of the fuel tank pressure sensor 61, when the pressure in the fuel tank is an excessive positive pressure higher than the reference pressure or an excessive negative pressure lower than the reference pressure, by the current control signal of the controller 60 As shown in FIGS. 7 and 8 , the three-way solenoid valve 40 may be held off or actuated.

When the three-way solenoid valve 40 is turned off, as is well known, the plunger 44 present inside the three-way solenoid valve 40 rises upward by the elastic restoring force of the spring 45, , The first opening/closing port 41 and the outside air port 43 of the three-way solenoid valve 40 communicate with each other, and at the same time, the second opening/closing port 42 is sealed.

Accordingly, when the pressure in the fuel tank 10 is excessively positive compared to the reference pressure, the 3-way solenoid valve 40 is turned off to open the first opening/closing port 41 connected to the air nipple 23 and the outside air. As the ports 43 communicate with each other, excessive static pressure in the fuel tank 10 is easily transferred through the air nipple 23, the first opening/closing port 41, and the outside air port 43 as indicated by arrows in FIG. 7 . can be resolved

On the other hand, when the pressure in the fuel tank 10 is excessively negative compared to the reference pressure, the 3-way solenoid valve 40 is turned off to open the first opening/closing port 41 connected to the air nipple 23 and the outside air. As the ports 43 communicate with each other, the outside air acts into the fuel tank 10 through the outside air port 43, the first opening/closing port 23, and the air nipple 23 as indicated by the arrow in FIG. Excess negative pressure in the tank 10 can be easily relieved.

9 and 10 show that the ODB diagnosis related to engine negative pressure is made in the ON state of the 3-way solenoid valve of the canister module for a vehicle according to the present invention.

Whether or not the evaporation gas collected in the canister 20 is combustibly purged to the engine intake system 30 by the engine negative pressure, and whether the engine negative pressure easily acts as the canister 20 and the fuel tank 10, etc. ODB diagnosis for confirming can be made easily.

To this end, the three-way solenoid valve 40 may be turned on by the current control signal of the controller 60 .

Accordingly, as described above, the second opening/closing port 42 and the outside air port 43 communicate with each other by the on operation of the three-way solenoid valve 40, and the first opening/closing port connected to the air nipple 23 ( 41) is closed by the plunger 44, so that the outlet of the air nipple 23 is blocked in an airtight manner.

At this time, the outside air flows through the outside air port 43 to the second opening/closing port 42 and the resistance induction hose 50, but as indicated by the arrow in FIG. 9, the check valve in the resistance induction hose 50 Air flow to the auxiliary nipple 24 is prevented by 52, and eventually the fuel tank 10 is in a state where the outside air is blocked.

In addition, even if outside air flows into the 3-way solenoid valve 40 through the outside air port 43, since the first opening/closing port 41 is sealed by the plunger 44, the first opening/closing port 41 ) to the air nipple 23 connected to the air nipple 23, and eventually the fuel tank 10 is blocked from the outside air.

Therefore, as indicated by the arrow in FIG. 10, the engine negative pressure is the fuel tank 10, the gas inlet pipe 11, the loading nipple 21, the canister 20, the purge nipple 22, and the gas purge pipe 12. ), it can act as the engine intake system 30 through, so whether or not the evaporation gas collected in the canister 20 is combustibly purged to the engine intake system 30 by the engine negative pressure, and the engine negative pressure is determined by the canister 20 And ODB diagnosis for confirming whether or not the fuel tank 10 functions easily can be easily performed.

Here, an example of operation control of the canister module of the present invention is as follows.

11 is a control flow chart for minimizing evaporative gas emission of a canister module for a vehicle according to the present invention.

First, it is determined whether or not the vehicle is running in high temperature and high altitude conditions.

To this end, when the internal temperature and pressure of the fuel tank are above a certain level

To this end, the controller 60 determines whether the fuel tank pressure exceeds the reference pressure and whether the outside temperature exceeds the reference temperature based on the detection signals of the fuel tank pressure sensor 61 and the outside air temperature sensor 62. Do (S101).

In addition, the controller 60 determines whether the vehicle is stopped based on the detection signal of the vehicle speed sensor 63 (S102).

As a result of the determination in steps S101 and S102 described above, when it is determined that the fuel tank pressure exceeds the reference pressure, the outside temperature exceeds the reference temperature, and the vehicle stop condition is due to non-detection of the vehicle speed, the current control of the controller 60 According to the signal, the three-way solenoid valve 40 is turned on (S103).

At this time, when the internal temperature and pressure of the fuel tank 10 increase due to external heat such as engine heat and exhaust heat as well as geothermal heat, the canister 20 ), evaporation gas exceeding the standard collection capacity may be introduced.

Therefore, by the on operation of the three-way solenoid valve 40, the second opening/closing port 42 and the outside air port 43 are in communication with each other, so that the auxiliary air nipple 24 and the resistance induction hose 50 and The second opening/closing port 42 is in a state of being in communication with the atmosphere through the outside air port 43, and at the same time, the first opening/closing port 41 connected to the air nipple 23 is sealed by the plunger 44. Accordingly, the outlet of the air nipple 23 is blocked in a confidential manner.

Therefore, after the evaporation gas in the fuel tank 10 flows into the canister 20, the evaporation gas exceeding the standard collection capacity from the canister 20 is not discharged through the air nipple 23 as in the prior art, and As indicated by the arrow in 6, the air can be discharged to the outside air through the auxiliary nipple 24, the resistance induction hose 50, the second opening/closing port 42, and the outside air port 43 in order (S104) .

As above, when the boil-off gas is released to the outside air, the auxiliary air nipple 24 having a smaller diameter than the air nipple 23 serves as a resistance when the boil-off gas is discharged, and together with the resistance induction hose 50 The two opening/closing ports 42 also play a role of resistance during discharge of the boil-off gas, thereby minimizing the amount of external discharge of the boil-off gas and preventing the smell of fuel due to excessive discharge of the boil-off gas.

Meanwhile, the controller 60 determines whether the vehicle is running based on the detection signal of the vehicle speed sensor 63 (S105), and if it is determined that the vehicle is running, the 3-way solenoid valve 40 is turned on again. OFF control (S105).

Accordingly, after the evaporation gas in the fuel tank 10 flows into the canister 20 while the vehicle is driving, the evaporation gas exceeding the standard collection capacity from the canister 20 smoothly passes through the air nipple 23 as in the prior art. may be released.

As described above, according to the operation control example of the canister module according to an embodiment of the present invention, when the internal temperature and pressure of the fuel tank exceed a certain level, the three-way solenoid valve 40 is controlled to be turned on so that the canister 20 By allowing the air auxiliary nipple 24 to communicate with the outside air, it is possible to minimize the amount of evaporation gas discharged to the outside, and to prevent a fuel smell that may cause discomfort to a driver who gets off for refueling.

12 is a control flow chart during fuel refueling of the canister module for a vehicle according to the present invention.

First, it is determined whether or not the fuel tank is in a fueling mode (S201).

The fueling mode may be determined based on a detection signal of the fuel sender 64 for detecting the amount of fuel in the fuel tank in the controller 60.

For example, if it is confirmed that the fuel change amount has changed by a certain amount or more based on the detection signal of the fuel sensor 64 in a state where the vehicle speed is not detected by the vehicle speed sensor 63, the controller 60 may recognize the fueling mode. can

Subsequently, when the controller 60 determines that fuel is being refueled in the fuel tank 10 based on the detection signal of the fuel sender, the three-way solenoid valve 40 is controlled to be off (S202).

Accordingly, by the off operation of the three-way solenoid valve 40, the air nipple 23 having a larger diameter than the air auxiliary nipple 24, the first opening/closing port 41, and the outside air port 43 communicate with each other. In this state, the pressure in the fuel tank 10 can be easily relieved, and accordingly fuel can be smoothly injected into the fuel tank 10 (S103).

Next, based on the detection signal of the fuel sender 64, the controller 60 determines whether the fuel tank 10 is fully refueled (S104).

Subsequently, when it is determined that the fuel is fully refueled in the fuel tank based on the detection signal of the fuel sender 64, the controller 60 controls the three-way solenoid valve 40 to be on (S105).

Accordingly, as shown in FIG. 6 by the on operation of the three-way solenoid valve 40, the second opening/closing port 42 and the outside air port 43 communicate with each other, and thus the air auxiliary nipple 24 and resistance The induction hose 50 and the second opening/closing port 42 are in a state of being in communication with the atmosphere through the outside air port 43, and at the same time, the first opening/closing port 41 connected to the air nipple 23 is a plunger. As it is sealed by (44), the outlet of the air nipple 23 is blocked in a confidential manner (S106).

Therefore, when refueling the fuel pool, the three-way solenoid valve 40 is controlled to be turned on so that the auxiliary air nipple 24 having a smaller diameter than the air nipple 23, the resistance induction hose 50, and the second opening/closing port 42 is in a state of being in communication with the atmosphere through the outside air port 43, so that pressure relief in the fuel tank 10 may be delayed or prevented, and thus fuel is fully injected into the fuel tank 10. It is possible to prevent an over-injection phenomenon in which more fuel is injected.

Although the present invention has been described in detail as one embodiment, the scope of the present invention is not limited to the above-described embodiment, and various modifications of those skilled in the art using the basic concept of the present invention defined in the claims below And improvements will also be included in the scope of the present invention.

10: fuel tank 11: gas inlet pipe
12: gas purge pipe 13: gas discharge pipe
14: canister closed valve 15: air filter
20: canister 21: loading nipple
22: purge nipple 23: air nipple
24: air auxiliary nipple 26: evaporation gas discharge unit
30: engine intake system 40: 3-way solenoid valve
41: first opening/closing port 42: second opening/closing port
43: external air port 44: plunger
45: spring 50: resistance induction hose
52: check valve 60: controller
61: fuel tank pressure sensor 62: outside air temperature sensor
63: vehicle speed sensor 64: fuel sender

Claims (10)

An air nipple mounted on the evaporation gas discharge part of the canister;
an auxiliary air nipple provided with a smaller diameter than the air nipple and spaced apart from the air nipple at the evaporative gas discharge portion of the canister;
a three-way solenoid valve having a first opening/closing port connected to the air nipple, a second opening/closing port connected to the air auxiliary nipple, and an outside air port communicating with outside air;
a resistance induction hose connected between the air auxiliary nipple and the second opening/closing port; and
a controller for controlling the 3-way solenoid valve to be turned on so as to communicate the auxiliary air nipple and the outside air port, or to control the 3-way solenoid valve to be turned off in order to communicate the air nipple and the outside air port;
A canister module for a vehicle, characterized in that configured to include.
The method of claim 1,
The canister module for a vehicle, characterized in that the resistance inducing hose and the second opening/closing port have the same diameter as the air auxiliary nipple or a smaller diameter than the air nipple.
The method of claim 1,
A canister module for a vehicle, characterized in that a check valve for allowing only the flow of evaporation gas from the air auxiliary nipple to the three-way solenoid valve is mounted inside the resistance induction hose.
The method of claim 1,
The canister module for a vehicle, characterized in that the air nipple and the auxiliary air nipple are integrally injected into the evaporative gas discharge part of the canister or manufactured as a separate molded product and mounted.
The method of claim 1,
The controller,
A canister module for a vehicle, characterized in that configured to receive a detection signal for determining on or off control of a three-way solenoid valve from a fuel tank pressure sensor, an outside air temperature sensor, a vehicle speed sensor, and a fuel sender.
The method of claim 5,
The controller,
Based on the detection signals of the fuel tank pressure sensor and the outside temperature sensor, it is determined that the fuel tank pressure exceeds the reference pressure or the outside temperature exceeds the reference temperature, and it is determined that the vehicle is in a stopped state based on the detection signal of the vehicle speed sensor. When it is, the canister module for a vehicle, characterized in that configured to control the three-way solenoid valve to be turned on.
The method of claim 6,
When the three-way solenoid valve is controlled by the controller to turn on, the air nipple of the canister is blocked from outside air and at the same time, the air auxiliary nipple is turned off by the check valve to enable OBD diagnosis to diagnose whether or not engine negative pressure has acted on the fuel tank. A canister module for a vehicle, characterized in that blocked.
The method of claim 5,
The controller,
The canister module for a vehicle according to claim 1 , wherein the canister module is configured to maintain the 3-way solenoid valve in an off state or control the 3-way solenoid valve to be off from an on state when it is determined that the vehicle is in a driving state based on the detection signal of the vehicle speed sensor.
The method of claim 5,
The controller,
The canister module for a vehicle, characterized in that configured to control the three-way solenoid valve to be off when it is determined that fuel is being refueled in the fuel tank based on the detection signal of the fuel sender.
The method of claim 9,
The controller,
The canister module for a vehicle, characterized in that configured to control the three-way solenoid valve to be turned on when it is determined that the fuel is fully refueled in the fuel tank based on the detection signal of the fuel sender.