KR20160019567A

KR20160019567A - Structure of canister

Info

Publication number: KR20160019567A
Application number: KR1020140103182A
Authority: KR
Inventors: 김창한; 이재민; 김명환
Original assignee: 현대자동차주식회사
Priority date: 2014-08-11
Filing date: 2014-08-11
Publication date: 2016-02-22

Abstract

The present invention relates to a structure of a canister, which collects a fuel evaporated in a fuel tank and purges the evaporated fuel by an engine. The structure of the canister includes: the canister; a three way valve including two inlets and one outlet, whose one end is connected to the canister and the other end is connected to the canister through a supply line connected to the outlet; a first line wherein outer air flows inside through one end and the other end is connected to one among the inlets of the three way valve; and a second line connected to a heat generator in order for the outer air flowing inside to be heated, wherein the outer air flows inside through one end and the other end is connected to the other one among the inlets of the three way valve. The outer air flowing inside through the first line cools the canister when the fuel is collected. The three way valve is controlled in order for the outer air heated through the second line to be heated when the fuel is purged. A fourth line is additionally connected in order for the outer air passing through the three way valve to be supplied to a fuel tank, and a case including a phase transition substance, which absorbs the heat when the outer air of a predetermined temperature or greater, is connected to the forth line. The structure of the canister improves performance of the canister by maintaining an optimal temperature according to the collection or purge of the canister. The structure of the canister additionally includes the fourth line capable of cooling the outer air by using the phase transition substance and can suppress increase in an evaporated gas by cooling the fuel tank when the heated outer air is supplied to the three way valve.

Description

Structure of canister {Structure of canister}

The present invention relates to a structure of a canister, and more particularly, to a structure of a canister capable of suppressing and controlling the amount of hydrocarbon evaporation by not only increasing the adsorption and desorption efficiency of the canister but also lowering the internal temperature of the fuel tank Structure.

A fueling device of a vehicle is a device for storing and supplying fuel consumed in an engine. The fueling device is a fuel tank for storing fuel, a fuel pump for supplying fuel in the fuel tank to the vaporizer, a fuel filter for removing impurities of fuel, And a canister for collecting the vaporized fuel in the tank.

On the other hand, the main component of the gasoline is a hydrocarbon (HC), and a ventilator is required to prevent it from occurring as the internal pressure increases due to the volume expansion due to the temperature rise in the fuel tank. In addition, an evaporative gas control device is also required to prevent the evaporation gas from being released into the atmosphere.

The canister is a device for controlling the gasoline evaporation gas. In the state where the engine is stopped, the gaseous fuel is captured (adsorbed) on the activated carbon installed therein. When the engine is operated, fresh air is injected from the outside of the canister, And operates to purge (desorb) the adsorbed fuel to the intake system of the engine.

That is, the canister operates so that adsorption and purging are repeatedly performed. However, in the case of a recently developed engine (for example, an engine such as a 'Continuously Variable Valve Lift' or a 'Hybrid Electric Vehicle'), the number of fuzzy operations tends to decrease with decrease in the negative pressure region of the engine. It was necessary to further increase.

On the other hand, in the adsorption in the canister, the hydrocarbon gas is collected while being liquefied in the activated carbon, and heat is generated as the gas is phase-changed. Accordingly, the higher the temperature, the lower the rate at which liquefaction is achieved and the lower the adsorption rate. Therefore, in order to improve the adsorption rate of the fuel gas, it is necessary to suppress the temperature rise inside the canister.

In addition, the hydrocarbon captured in the activated carbon of the canister is vaporized in the liquid state, and is discharged to the intake system of the engine, resulting in an endothermic reaction during liquefaction. Therefore, the lower the temperature, the lower the rate of vaporization and the purge efficiency. Therefore, in order to improve the purging performance, it is necessary to suppress the temperature drop inside the canister.

In addition, the fuel tank (mounted near the canister or combined with the canister) has a problem that the odor may be generated inside or outside the vehicle beyond the adsorbable capacity of the canister as the evaporation gas increases as the internal temperature increases, .

As shown in FIG. 5, a structure in which a heater (b) is coupled to a canister (a) in order to increase the purging efficiency of the canister has been disclosed in the related art. However, However, there was a problem that there was a risk of fire due to a decrease in fuel consumption due to electricity consumption, and it was impossible to increase the adsorption performance of the canister.

Accordingly, the present invention not only improves the performance of the canister by controlling (by cooling or heating) the temperature according to the adsorption or purging of the canister, but also allows the fuel tank to be cooled, It is a main object to provide a structure of a canister which can solve all the problems.

According to an aspect of the present invention, there is provided a structure of a canister for collecting fuel vaporized in a fuel tank and purging the fuel into an engine, the canister having a canister, two inlets and one outflow port, A first line connected to one of the inlets of the three-way valve, the other end of the three-way valve being connected to the canister through a supply line connected to the outlet; And a second line connected to the other one of the inlet ports of the three-way valve and having an inlet for introducing outside air at one end and connected to the heat generating device for heating the introduced outside air, And the three-way valve is controlled so that the introduced outside air cools the canister and the outside air heated through the second line heats the canister when the fuel is purged.

The fourth line is connected to the fuel tank. The fourth line is connected to a phase change material that absorbs heat when ambient air of a predetermined temperature or higher passes through the fourth line. And a case with a built-in battery.

The fourth line has a corrugated pipe shape to increase a heat exchange area, and is arranged so that a zigzag shape ('U' shape is repeated) is formed inside the case.

The phase change material according to an embodiment of the present invention has a melting point of 37 캜 and is liquefied from a solid to a liquid when the outside air having a temperature higher than the melting point passes, thereby cooling the outside air.

Further, in the embodiment of the present invention, the heat generating device is a muffler through which exhaust gas passes and is heated. In addition, the present invention comprises a three-way connector having one inlet and two outlets connected to a third line to which outside air flows from one side, and the first line and the second line are connected to respective outlets of the three-way connector.

The present invention having the above-described configuration has an effect of further improving the performance of the canister by maintaining an optimum temperature in accordance with the trapping or purging of the canister.

In addition, since the present invention further includes a fourth line capable of cooling the outside air through the phase change material, even when the heated outside air is supplied to the three-way valve, it is possible to cool the fuel tank, .

Further, since the heat-generating apparatus of the present invention is implemented by a muffler heated by a stove, no additional energy consumption is caused (to heat the inside of the canister), and the first line and the second line are connected through the upper connector The passage through which the outside air flows can be constituted only by the third line.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram illustrating the structure of a canister constructed in accordance with a preferred embodiment of the present invention,
2 is a view illustrating a three-way valve according to a preferred embodiment of the present invention. In the lower left figure, a first line and a canister are connected to supply a low-temperature outside air. A second line and a canister are connected to supply a high-temperature outside air;
3 is a flowchart showing a step of supplying a cooling outside air or a heating outside air according to the purge condition,
FIG. 4 is a cross-sectional view illustrating a fourth embodiment of the present invention in which a fourth line is mounted in a case, and FIG. 4 is an enlarged view of the fourth line.
5 is a view showing a heater mounted on a canister according to a conventional method;

Hereinafter, a structure of a canister according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

The canister 1 according to the present invention collects the fuel vaporized in the fuel tank 2, and when fuel starts to be consumed in the engine (not shown), the fuel .

The outside air flowing into the canister 1 is supplied to the canister 1 via a three-way valve 50 having two inlets and one outflow port. The three-way valve (50) is a valve that opens and closes one of the inlets on both sides and shields the other, and operates in response to power application. The control device controls the collection and purging of the canister (1) ).

The three-way valve 50 is connected to the canister 1 through a supply line 51 connected to an outlet port and the first line 10 and the second line 20 are connected to the inlet ports on both sides.

The first line 10 supplies outside air of low temperature introduced from the outside of the vehicle body to the three-way valve 50. The second line 20 heats outdoor air introduced from the outside of the vehicle body, .

That is, the second line 20 is coupled to the heat generating device so that heat is exchanged in the heat generating device while the introduced outside air flows through the second line 20, and reaches the three-way valve 50 in a heated state do.

The heat generating device according to the preferred embodiment of the present invention is implemented with a muffler 3 through which exhaust gas passes and is heated. The portion 20a of the second line welded or coupled to the surface of the muffler 3 is made of a metal material so that heat exchange can be easily performed, and is formed in a zigzag bent shape Quot; U " shape repeatedly).

The first line 10 and the second line 20 may be configured to introduce outside air at different positions of the vehicle body. In a preferred embodiment of the present invention, a third line The air is supplied to the first line 10 and the second line 20 through the three-way connector 60 after the outside air is introduced through the three-way connector 30.

3, the three-way valve 50 according to the embodiment of the present invention includes a nipple for connecting the first line 10 and the second line 20 to both sides of the housing 52, And a nipple to which the supply line 51 is connected is formed at an intermediate point between the both side nipples, that is, it is configured to have a 'T' shape.

In addition, one of the connecting side of the first line or the connecting side nipple of the second line is selectively shielded in the housing 52, and the other is connected to the (canister connecting side) The plunger 53 is slidably mounted so as to be opened with the nipple.

According to the present invention having the above-described configuration, as shown in FIG. 4, the adsorption of the fuel inside the canister 1 is carried out in accordance with the purge condition of the canister 1 (that is, depending on whether the fuel needs to be adsorbed or purged) Way valve 50 cuts off the second line 20 and connects the first line 10 with the supply line 51 to supply the low temperature outside air to the interior of the canister 1 to increase the adsorption rate Increase.

The third line valve 20 is connected to the second line 20 through which the first line 10 is closed (the outdoor air whose temperature has risen due to the heat exchange with the muffler flows) under the condition that purging of the canister 1 is required, Is connected to the supply line (51) to supply high-temperature outside air to the inside of the canister (1), thereby increasing purge efficiency.

Accordingly, in the present invention, low-temperature outside air flows into the canister 1 when adsorbed, and high-temperature outside air flows into the canister 1 when purged, so that the performance of the canister 1 can be further improved, The unnecessary power consumption can be suppressed by using the existing exhaust heat rather than a separate heat source.

In the present invention, the fourth line 40 is additionally connected to cool the canister 1 as well as the fuel tank 2 to minimize the evaporation amount of the fuel.

The fourth line 40 is connected to one end of the supply line 51 so as to be branched from the supply line 51 (or connected to discharge the outside air simultaneously with the supply line in the three-way valve), and the other end is connected to the fuel tank 2 Respectively.

As shown in FIG. 4, a case 70 incorporating a phase change material 71, which absorbs heat when a predetermined temperature or more passes through the fourth line 40, is coupled to the fourth line 40.

The phase change material 71 according to the embodiment of the present invention is preferably a paraffinic material (which does not cause damage to peripheral parts even if leaked in the case), and when heated to a predetermined temperature, So as to cause an endothermic reaction.

That is, when the first line 10 and the fourth line 40 are opened (when the low-temperature outside air is supplied to the fuel tank), the outside air passes through the case 70 through the fourth line 40 While the phase transition material remains solid.

However, when the second line 20 and the fourth line 40 are opened (when high-temperature outside air is supplied to the fuel tank), the outside air heated by the muffler 3 flows through the fourth line 40 During passing through the case 70, the phase change material 71 is phase-changed from solid to liquid and causes an endothermic reaction, thereby cooling the outside air passing through the fourth line 40.

In a preferred embodiment of the present invention, the fourth line 40 has a corrugated shape to increase the heat exchange area. That is, the groove 40a and the protruding portion 40b are continuously repeated along the perimeter in the outer peripheral surface. In addition, a part of the fourth line 40 mounted inside the case 70 is bent and arranged so that a zigzag shape is formed (the 'U' shape is repeated).

The phase change material 71 according to the embodiment of the present invention preferably has a melting point of 37 DEG C and liquefies from a solid to a liquid when the outside air having a temperature equal to or higher than the melting point passes.

For example, when 1.5 kg of the paraffin-based phase change material 71 having a heat of fusion of 88.5 kcal / kg is loaded in the case 70, the outside air heated to 50 ° C. through the muffler 3 is expressed by Equation 1 as follows: The cooling in the case 70 is performed up to 32 deg.

[ Formula 1 ]

According to the structure as described above, since the structure of the present invention can lower the temperature inside the fuel tank 2, not only when the outdoor air at low temperature is supplied to the three-way valve 50 but also when the outdoor air at high temperature is supplied, The amount of hydrocarbon (HC) evaporation in the tank 2 can be reduced.

For reference, in the present invention, the portions where the heat exchange is performed (the portion where the heat exchange between the second line and the muffler and the portion where the fourth line is embedded in the case) can be easily heat-exchanged, steel, and the length, diameter, position, shape and the like of the portion where heat exchange is performed can be variously determined according to the required specifications. The control device for applying power to the three-way valve 50 can be configured to communicate with the ECU and the canister of the engine and the temperature sensor inside the fuel tank, and can cool the outside air in consideration of the running situation of the vehicle, .

As described above, the embodiments disclosed in the present specification and drawings are only illustrative of specific examples in order to facilitate understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

1: Canister
2: Fuel tank
10: First line
20: second line
30: Line 3
40: fourth line
50: Three-way valve
51: Supply line
60: three-way connector
70: Case
71: Phase transition material

Claims

A structure of a canister in which fuel vaporized in a fuel tank is collected and purged by an engine,
With canister;
A three-way valve having two inlets and one outflow port, the three-way valve having one end coupled to the canister and the other end connected to the canister through a supply line connected to the outflow port;
A first line in which outside air is introduced at one end and the other end is connected to one of the inlets of the three-way valve; And
And a second line connected to the other one of the inlet ports of the three-way valve and connected to the heat generating device to heat the introduced outdoor air,
Wherein when the fuel is collected, the three-way valve is controlled such that the outside air flowing through the first line cools the canister and the outside air heated through the second line heats the canister when the fuel is purged.

2. The fuel cell system according to claim 1, wherein a fourth line is further connected to supply the outside air having passed through the three-way valve to the fuel tank,
And a case incorporating a phase change material for absorbing heat when a predetermined temperature or more of ambient air passes through the fourth line is incorporated.

3. The canister structure according to claim 2, wherein the fourth line has a corrugated pipe shape, and is arranged in a zigzag shape inside the case.

3. The structure of a canister according to claim 2, wherein the phase change material has a melting point of 37 DEG C and is cooled from a solid to a liquid when the outside air having a temperature equal to or higher than the melting point passes, thereby cooling the outside air.

5. The structure of a canister according to any one of claims 1 to 4, wherein the heat generating device is a muffler which is heated by exhaust gas.

The connector according to claim 5, further comprising a three-way connector having one inlet and two outlets connected to a third line to which outside air flows from one side, wherein the first line and the second line are connected to respective outlets of the three- Features of the canister.