KR19990003205U - Vehicle Fuel Evaporation Control System - Google Patents

Abstract

The present invention is to enable the vehicle to adjust the supply of boil-off gas to the cylinder during warm-up, and at the same time to reduce the harmful emissions by allowing the boil-off gas supplied to the cylinder to be supplied in a low density state, The structure is connected to a second hose for guiding the flow of boil-off gas to the fuel tank installed in the rear of the vehicle, the first hose for guiding the flow of boil-off gas to the second hose is coupled to the throttle body A damper is provided between the first and second hoses to regulate the flow of the boil-off gas, and a case is provided with a wax for providing an acting force on the damper, and at the same time the coolant from the radiator is installed in the wax. Fuel evaporating gas controller for a vehicle coupled to the first and second hoses while the housing allows the To provide a roll in the device.

Description

Vehicle Fuel Evaporation Control System

The present invention relates to a structure for variably supplying boil-off gas of fuel, and in particular, to prevent the boil-off gas generated from the fuel tank from being supplied to the idle state while the engine is running, and at the same time the boil-off gas can be supplied. The present invention relates to a fuel evaporation gas control apparatus for a vehicle in which a harmful gas component in exhaust gas is reduced by allowing a density to be reduced.

In general, the evaporated gas is a phenomenon in which the fuel filled in the fuel tank easily evaporates when the internal pressure of the fuel tank increases as the temperature increases due to external environmental requirements.

In the related art, a hose for guiding the flow of boil-off gas is connected to a fuel tank installed at the rear of a vehicle, and a canister for absorbing and purifying moisture contained in the boil-off gas is connected to the hose.

At this time, the canister is fixedly mounted below the front fender of the vehicle.

A purge control valve (PCV) is connected to the canister to regulate the flow of boil-off gas, and another hose is connected to the PCV to guide the flow of the boil-off gas, but the tip is connected to the throttle body.

In addition, an electronic control module (ECM) for transmitting an operation command based on the information transmitted to the PCV is connected.

Referring to the operation of the conventional technology configured as described above is as follows.

First, when the temperature of the fuel tank rises due to environmental factors, the boil-off gas is generated from the fuel inside, and the boil-off gas moves to the canister along the hose.

When the engine is stopped in the above state, since the PCV is closed, the evaporated gas does not move to the throttle body, and remains in the canister.

At this time, if the evaporation gas is continuously generated from the fuel tank is moved to the canister along the hose, in this state, a part is exhausted to the outside through the atmospheric pressure hole formed separately in the canister.

Meanwhile, when the engine is operated, the boil-off gas remaining in the canister flows along the hose and flows through the PCV into the throttle body.

As described above, the evaporated gas introduced into the throttle body enters the surge tank together with the air supplied from the outside, and simultaneously flows into the cylinder through the intake manifold together with the fuel injected from the injector.

The above-described conventional technique is a factor in which CO, HC, etc. are discharged by the structure in which the evaporative gas is always supplied even when the vehicle warms up, and the evaporated gas which is suddenly supplied is supplied in a high density state. Likewise, there is a problem of exhausting harmful gas components such as CO and HC.

The object of the present invention is to enable the vehicle to adjust the supply of the boil-off gas to the cylinder during warm-up and at the same time to reduce the harmful exhaust gas by supplying the boil-off gas to the cylinder at a low density.

According to the present invention for realizing this, a second hose for guiding the flow of boil-off gas is connected to a fuel tank installed at the rear of the vehicle, and the first hose for guiding the flow of boil-off gas is throttled to the second hose. The front end is coupled to the body, and a damper is provided between the first and second hoses to adjust the flow of the boil-off gas, and a wax is provided on the damper to provide an action force to open and close the damper. A case is installed and a housing for allowing coolant to provide heat to the wax at the same time is coupled to the first and second hoses, while connecting a hose for guiding the cooling water from the radiator. Is installed.

1 is an installation state diagram showing an embodiment of the present invention.

Figure 2 is a side cross-sectional view showing an embodiment of the present invention in detail.

* Description of the symbols for the main parts of the drawings *

2: Cylinder head 4: Intake manifold 6: Surge tank

8: Throttle Valve 10: Throttle Body 12: Air Cleaner

14: Duct 16: First house 18: Housing

20: second hose 22: body 24: damper

26: Pellets 28: Case 30: Wax

32: Spring 34: Pin 36: Fuel tank

In the present invention, an intake manifold 4 for guiding the inflow of the mixed gas is installed in the cylinder head 2 constituting the engine as shown in FIG. 1, and air is introduced into the intake manifold 4. The surge tank 6 is distributed so that it can be distributed.

In addition, a throttle body (10) rotatably coupled to a throttle valve (8) for adjusting the amount of air flow is installed in the surge tank (6), and the throttle body (10) purifies the air flowing from the outside. To connect the air cleaner 12 to the duct 14 is connected.

In addition, the first hose 16 for guiding the flow of the boil-off gas is connected to the throttle body 10, and the coolant circulated by the water pump through a radiator not shown in the first hose 16. The housing 18 is installed to allow the passage, and the internal structure thereof is as follows.

The first hose 16 and the second hose 20 for guiding the flow of the boil-off gas are located inside the housing 18 while being positioned to be in contact with each other. A radiator is provided at one side of the housing 18. The third hose 19 is connected to guide the flow of the coolant is moved from.

At this time, the body 22 is installed between the first and second hoses 16 and 20 while being positioned, so as to adjust the flow of the boil-off gas moved through the second hose 20 to the body 22. Dampers 24 are coupled to be operated up and down.

And a pellet (26) for transmitting an action force to the upper part of the damper (24) to act as a dog, lungs are connected, the case (28) is coupled to the upper portion of the pellet 26, the body ( 22) and is fixedly installed.

In addition, the case 28 is provided with a wax 30 to expand and contract while being thermally deformed by the coolant passing through the housing 18, and at the same time a return force when the action force of the wax 30 is lost. A spring 32 is provided which is provided on the pellets 26.

In addition, a plurality of fins 34 are formed in the second hose 20 so that the heat of the cooling water passing through the housing 18 can be easily transferred, and at the same time after the second hose 20 A fuel tank 36 filled with fuel at the end is connected.

Referring to the operation of the present invention configured as described above are as follows.

First, when the fuel tank 36 receives heat by external weather requirements, evaporated gas is generated from the fuel, and the evaporated gas moves along the second hose 20 and flows into the housing 18. do.

As described above, the evaporated gas introduced into the housing 18 is supplied to the throttle body 10 while moving along the first hose 16 by the damper 24 opening the passage.

At the same time, the boil-off gas and air are introduced into the surge tank 6 while being mixed with the air introduced from the outside through the duct 14, and together with the injector shown when passing through the intake manifold 4. Fuel injected from the gas is supplied to each cylinder constituting the engine in the form of a mixed gas together with air supplied from the outside.

When the boil-off gas is supplied while the engine is operating as described above, the coolant passing through the radiator is introduced into the housing 18, and at the same time, the coolant introduced into the housing 18 is low in the warming-up state. The fin 34 formed on the second hose 20 cannot be heated.

Along with this, the coolant in the low temperature state does not heat the case 28, and the wax 30 therein is in a contracted state. As a result, the pellets may be formed by the repulsive force of the spring 32 in the case 28. 26) is in the downward position.

Therefore, the damper 24 is closed by the said pellets 26, and the channel | path between the 1st and 2nd hoses 16 and 20 is closed.

Subsequently, when the temperature rises by the engine in which the coolant operates, the case 28 is heated by the moving coolant, thereby pushing the pellet 26 upward while the wax 30 therein expands. .

At this time, the pellet 26 therein is raised while compressing the spring 32.

Subsequently, the coolant moves along the third hose 19 and flows into the housing 18. In this state, the fin 34 formed on the second hose 20 by the coolant receives heat. Heated while receiving.

Therefore, the evaporated gas moved through the second hose 20 is in a state of low density while expanding by the heat transferred by the fin 34.

At the same time, as the wax 30 installed in the housing 18 expands due to the transferred heat, the damper 24 is raised to open the passage.

Therefore, the low-density evaporated gas heated by the fin 34 is supplied to the throttle body 10 as described above through the first hose 16 while the passage is opened by the damper 24. .

The boil-off gas supplied as described above is supplied to each cylinder in the form of a mixed gas together with the fuel injected from the injector, and the mixed gas introduced into the cylinder is exhausted to the outside in the form of combustion gas while passing through an explosive stroke in the cylinder. do.

At this time, the combustion gas is in a state in which components such as CO and HC can be reduced by the boil-off gas mixed appropriately.

The present invention blocks the supply of boil-off gas at the time of warming up and at the same time, it is possible to reduce the harmful exhaust gas by allowing the boil-off gas to be supplied to the cylinder in a low density state.

Claims (2)

A second hose 20 for guiding the flow of the boil-off gas is connected to the fuel tank 36 installed at the rear of the vehicle, and the first hose (guiding the flow of the boil-off gas to the second hose 20) 16 is coupled to the throttle body 10 while engaging the tip, A case 28 is provided between the first and second hoses 16 and 20 with a damper 24 for regulating the flow of boil-off gas and a wax 30 for providing an acting force on the damper 24. Is installed, and at the same time, the vehicle fuel 18 is coupled to the first and second hoses 16 and 20 while the housing 18, which allows the cooling water to flow from the radiator into the wax 30, is contained in the case 28. Evaporative gas control device. The method of claim 1, Fins 34 are formed on either side of the first and second hoses 16 and 20 located in the housing 18 so that heat can be easily transferred from the coolant passing through the housing 18. Automotive fuel evaporative gas control device.