KR20010048666A - Fuel vaporization control system - Google Patents

Abstract

PURPOSE: A fuel vaporization gas controlling system for a vehicle is provided to simplify the structure for cleaning a filter of a purge control solenoid valve by flowing the air of an intake unit to the purge control solenoid valve when the filter is clogged. CONSTITUTION: A fuel vaporization gas controlling system for a vehicle includes a purge control solenoid valve via which a canister connected to a fuel tank is connected to an intake unit of an engine a main body part for controlling fuel vaporization gas, wherein the purge control solenoid valve includes a main body part(20) formed with a through hole(26) in an axial line direction in the center and a main bypass hole(34) in an axial line direction at an outer peripheral part, and mounted with a filter(30) and a solenoid at an outer part of the through hole and a diaphragm(32) at an upper part of the through hole to be driven by the solenoid, an upper housing(22) disposed at an upper part of the main body part and having an upper direction converting valve for alternatively connecting the through hole to a vaporization gas inlet(36) or the through hole to the main bypass hole, and a lower housing(24) disposed at a lower part of the main body part and having a lower direction converting valve for alternatively connecting the through hole to an exhaust hole(52), the through hole to an intake air inlet(58), or the exhaust hole to the main bypass hole.

Description

Fuel Evaporative Gas Control System for Vehicles {FUEL VAPORIZATION CONTROL SYSTEM}

The present invention relates to a fuel evaporation gas control system of a vehicle, and more particularly to fuel evaporation of a vehicle to prevent air emissions due to clogging of a purge control solenoid valve to reduce air pollution by fuel evaporation gas. It relates to a gas control system.

For example, the fuel system of an automobile collects boil-off gas in order to prevent polluted air from being released into the atmosphere due to the evaporation of fuel stored in the fuel tank according to the flow and internal temperature. A fuel evaporative gas control system is constructed that can be introduced into the system for recombustion.

Referring to the configuration of the fuel boil-off gas control system, as shown in FIG. 8, a line 102 communicating with the upper side of the fuel tank 100 is connected to the canister 104, and the canister 104 thereof is a purge control solenoid. Connection is made with the intake cylinder 110 of the engine 108 via the valve 106.

The canister 104 is filled with activated carbon to adsorb and store the boil-off gas of the fuel, and then, when the purge control solenoid valve 106 is opened, fuel can be introduced into the intake pipe together with the air flowing downward.

In the control system of the boil-off gas configured as described above, fuel boil-off gas is stored in the canister 104 when the engine is turned off, and when the engine is operated, the purge control solenoid valve 106 is driven by the engine control unit (ECU). The operation is to open the flow path and the fuel trapped in the canister 104 by the negative pressure of the intake cylinder 110 is introduced into the intake cylinder 110 with air and burned.

However, in the fuel gas control system as described above, it consists of a pipeline that can only pass the boil-off gas, and when the diaphragm portion of the purge control solenoid valve is clogged, no means for bypassing the boil-off gas is devised. have.

As a result, when the diaphragm portion of the purge control solenoid valve is clogged, the fuel boil-off gas trapped in the canister has a problem of being polluted by the release of the atmosphere.

And there is an example in which the filter is arranged upstream of the diaphragm in the purge control solenoid valve as a means for solving the above problems, in this case also when the filter is clogged by foreign matter contained in the carbon particles of the canister or evaporated gas and The same problem occurs.

Therefore, the present invention has been invented to solve the above problems, an object of the present invention is to purge the filter by backflowing the air in the intake pipe to the purge control solenoid valve when the filter of the purge control solenoid valve is clogged, purge control It is an object of the present invention to provide a fuel evaporation gas control system for a vehicle that can prevent air emissions due to the clogging of solenoid valves to reduce air pollution caused by fuel evaporation gas.

1 is an overall configuration diagram of a control system according to the present invention.

Figure 2 is a longitudinal sectional view of the purge control solenoid valve applied to the present invention.

3 is a cross-sectional view of the purge control solenoid valve applied to the present invention during filter blow operation.

4 is a perspective view of an upstream valve body applied to the purge control solenoid valve of the present invention.

5 is a cross-sectional view taken along line II of FIG. 2.

6 is a perspective view of a downstream valve body applied to the purge control solenoid valve of the present invention.

FIG. 7 is a cross-sectional view taken along the line II-II of FIG. 2. FIG.

8 is a block diagram of a conventional boil-off gas control system.

In order to achieve the above object, the present invention provides a fuel evaporation gas control system in which a fuel tank is connected to a canister, and the canister is connected to an intake tube of an engine via a purge control solenoid valve to control fuel evaporation gas.

The purge control solenoid valve has a through-hole in the axial direction at the center thereof, and a solenoid is disposed outwardly, and a diaphragm operated by the filter and the solenoid is disposed on the upstream and the downstream sides of the through-hole, and the main axis in the axial direction is located at the outer circumferential side. A main body portion in which a bypass hole is formed;

An upstream housing, including an upstream directional valve for selectively communicating the through-hole and the boil-off gas inlet of the main body, and the through-hole and the main bypass passage;

And a downstream housing including a downstream directional valve configured to communicate the through and exhaust holes of the main body, the downstream and intake inlet, and the exhaust and main bypass holes. To provide a fuel evaporative gas control system.

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

FIG. 1 is a schematic configuration diagram of an evaporative gas control system according to the present invention, in which a fuel tank 2 is connected to a canister 4, and a canister 4 thereof is provided with an engine 8 via a purge control solenoid valve 6. The connection with the intake pipe 10 of the) is made.

In the canister (4) is filled with activated carbon inside the adsorption of the vaporized gas of the fuel is stored by the fuel to be introduced into the intake cylinder with the air flowing into the lower side when opening the purge control solenoid valve (6).

The fuel boil-off gas is stored in the canister 4 when the engine is stopped by the above configuration, and when the engine is operated, the purge control solenoid valve 6 is operated by the engine control unit ECU to open the flow path. By the negative pressure of the intake cylinder 10, the fuel collected in the canister 4 is introduced into the intake cylinder 10 together with the air to be reburned.

In the evaporative gas control system, the present invention is connected to the intake pipe 10, the downstream side of the purge control solenoid valve 6, branched to both sides, one side is connected to the intake manifold 12, the other Connected to an air cleaner (14).

When the filter of the purge control solenoid valve 6 is clogged, the intake manifold 12 and the air cleaner 14 communicate with each other through the purge control solenoid valve 6 to form a negative pressure formed in the intake manifold 12. The new air on the air cleaner 14 side flows back into the purge control solenoid valve 6 to remove foreign substances attached to the filter to flow into the intake manifold 12.

To this end, in the present invention, as shown in Figs. 2 to 7, the direction switching valves 16 and 18 are disposed on the upstream and downstream sides of the purge control solenoid valve 6.

That is, as shown in Figure 2, the purge control solenoid valve 6 has a main body 20 in the center, as shown in Figure 2, the upper and downstream direction switching valves (16, 18) is built on both sides The downstream housings 22 and 24 are arranged.

As described above, the main body 20 has the through hole 26 in the center in the axial direction as in the prior art, and the solenoid 28 is disposed outside thereof, and the filter 30 is disposed upstream of the through hole 26. The diaphragm 32 operated by the solenoid 28 is disposed on the opposite side of the downstream side, and the configuration thereof is the same as that of the known art, and detailed descriptions and drawings will be omitted.

In addition, a main bypass hole 34 penetrating in the axial direction is formed at one side of the main body 20.

In addition, the upstream housing 22 coupled to the upstream side of the main body 20 has an inflow hole 36 arranged coaxially to communicate with the through hole 26, and the inflow hole 36 of At the inner end, a concave inlet portion 40 is formed in which the valve body 38 of the upstream direction changeover valve 16 can be slidably disposed, and the main bypass hole ( A first auxiliary bypass ball 42 is formed in communication with 34.

The upstream direction switching valve 16 disposed in the concave inlet 40 is a valve body 38 which is moved left and right in the concave inlet 40 and drives the valve body 38 as shown in FIG. It consists of a solenoid 46 which can be, the valve body 38 is a first valve hole 48 that can communicate the inlet hole 36 and the filter 30, the filter 30 and the first A second valve hole 50 is provided which can communicate with the auxiliary bypass ball 42.

Accordingly, the valve body 44 is moved according to the operation of the solenoid 46 while the first and second valve holes 48 and 50 pass through the inflow hole 36 as shown in FIG. 2 or FIG. 3. ) Or the first auxiliary bypass ball 42.

In addition, the downstream housing 24 coupled to the downstream side of the main body 20 has an exhaust hole 52 disposed in the same axis to communicate with the through hole 26, and the inner side of the exhaust hole 52. At the end, a concave inlet portion 56 is formed in which the valve body 54 of the downstream direction switching valve 18 can be slidably arranged, and the air cleaner 14 is disposed on the upper and lower sides of the concave inlet portion 56. An intake inlet 58 and a second auxiliary bypass hole 60 communicating with the main bypass hole 34 are formed.

Moreover, the downstream direction switching valve 18 arrange | positioned at the said intake part 56 drives the valve body 54 which moves left and right by the said intake part 56, and this valve body 54 as shown in FIG. And a solenoid 62 which can be made into contact with each other. The valve body 54 includes a first valve hole 64 capable of communicating the exhaust hole 52 and the through hole 26, and the exhaust hole 52. And a second valve hole 66 for communicating the second auxiliary bypass hole 60, and a third valve hole 68 for communicating the intake inlet hole 58 and the through hole 26 with each other.

Accordingly, the valve body 54 is moved according to the operation of the solenoid 62, and as shown in FIGS. 3 and 5, the first valve hole 64 connects the exhaust hole 52 to the through hole 26. The second and third valve holes 66 and 68 allow the exhaust hole 52 to communicate with the second auxiliary bypass hole 60 and the intake air inlet 58 with the through hole 26.

According to the present invention configured as described above, when the evaporating gas flows normally, the solenoids 46 and 62 are kept off, as shown in FIG. 2, so that the valve body of the upstream and downstream switching valves 16 and 18 ( 38 and 56 coincide in coaxial line with those of the first valve hole 48 and 64 with the through hole 26 and the inlet hole 36 and the exhaust hole 56 as shown in FIG. In this way, the vapor gas from the canister 4 flows into the intake manifold 12 normally.

However, when foreign matter adheres to the filter 30 and is clogged, both solenoid valves 46 and 62 are controlled to be in an on state.

Then, as shown in FIG. 3, the valve body 38 and 54 of the upstream and downstream side direction switching valves 16 and 18 are pulled, and the upstream valve body 38 has a second valve hole 50 through the hole 26. ) And the first auxiliary bypass hole 42 communicate with each other, and in the downstream valve body 54, the second valve hole 66 communicates the exhaust hole 52 with the second bypass hole 60. The three valve holes 68 communicate the intake air inlets 58 and the through holes 26.

Then, the intake manifold 12 and the air cleaner 14 are in communication with each other, so that the intake air flows from the air cleaner 14 due to the negative pressure of the intake manifold 12 while the filter flows backward from the purge control solenoid valve 6. It is introduced into the intake manifold 12 while controlling the foreign matter attached to the (30).

Accordingly, it is possible to completely solve the problem caused by clogging of the purge control solenoid valve 4 as in the prior art.

The solenoids 28, 46 and 48 are controlled by the engine control unit (ECU) in the above operation process, and the detailed description thereof will be omitted since it is known to drive the solenoid in the engine control unit.

The present invention, which is configured and operated as described above, is not limited to the above embodiments, but of course includes everything that can be easily implemented from the claims and the above embodiments.

As described above, according to the present invention, it is possible to clean the filter by flowing the air in the intake tube back to the purge control solenoid valve when the filter of the purge control solenoid valve is clogged.

Accordingly, the present invention can reduce air pollution caused by fuel boil-off gas by preventing the release of boil-off gas due to clogging of the purge control solenoid valve.

Claims (8)

In the fuel evaporation gas control system that the fuel tank is connected to the canister and the canister is connected to the intake pipe of the engine via the purge control solenoid valve to control the fuel evaporated gas, The purge control solenoid valve has a through-hole in the axial direction at the center thereof, and a solenoid is disposed outwardly, and a diaphragm operated by the filter and the solenoid is disposed on the upstream and the downstream sides of the through-hole, and the main axis in the axial direction is located at the outer circumferential side. A main body portion in which a bypass hole is formed; An upstream housing, including an upstream directional valve for selectively communicating the through-hole and the boil-off gas inlet of the main body, and the through-hole and the main bypass passage; And a downstream housing including a downstream directional valve configured to communicate the through and exhaust holes of the main body, the downstream and intake inlet, and the exhaust and main bypass holes. Fuel evaporation control system. The fuel evaporation gas of the vehicle according to claim 1, wherein the upstream housing has an inflow hole disposed coaxially with the through hole of the housing, and an upstream direction switching valve is disposed at a concave portion formed at an inner end of the inflow hole. Control system. The upstream directional valve according to claim 1 or 2, further comprising: a valve body disposed slidably from side to side in a recess formed in the upstream housing to selectively change port; And a solenoid connected to one side of the valve and driven under the control of an engine control unit to drive the valve body. The valve body according to claim 3, wherein the valve body has a first valve hole for communicating the inflow hole and the filter, and a second valve hole for communicating the main bypass ball through the first auxiliary bypass ball formed in the filter and the upstream housing. Fuel evaporation gas control system of a vehicle, characterized in that. The method of claim 1, wherein the downstream housing has an exhaust hole formed in the same axis as the through-hole of the body portion, the intake inlet is formed in a direction orthogonal to the exhaust hole thereof, the recessed portion is formed in the inner end of the exhaust hole and the intake inlet hole is downstream Fuel evaporation gas control system of a vehicle, characterized in that the switching valve is arranged. 6. The valve according to claim 1 or 5, further comprising: a valve body configured to slidably slide left and right at a recess formed in the downstream housing to selectively perform port conversion; And a solenoid connected to one side of the valve and driven under the control of an engine control unit to drive the valve body. The valve body of claim 6, further comprising: a first valve hole for communicating the exhaust hole and the through hole; A second valve ball communicating with a main bypass ball through said exhaust hole and a second auxiliary bypass ball of a downstream housing; And a third valve hole communicating with the intake air inlet and the through hole. The system according to claim 7, wherein the second valve hole and the third valve hole are disposed on the same vertical line.