KR102394842B1 - Air Damping Type Canister Close Valve and Vehicle Fuel System - Google Patents

Abstract

The vehicle fuel system of the present invention is coupled with a magnetic circuit member 10 in which magnetic energy conversion of electric energy is generated with a supplied current, and the magnetic circuit member 10 to form an inner space, so that the magnetic energy is converted into kinetic energy up and down by The valve actuating member 20, which opens and closes the conduit through movement, forms the inner space of the conduit as a closed space separated from the conduit, and generates an air damping effect with the air flow formed by the pressure difference between the inner space and the conduit when the conduit is opened and closed. By including an air damping type canister close valve (1) equipped with a diaphragm (25) to prevent It implements the feature that the operating noise is not perceived by the driver even in frequent operation.

Description

Air Damping Type Canister Close Valve and Vehicle Fuel System

The present invention relates to a canister close valve, and more particularly, to an air damping type canister close valve capable of reducing operating noise without changing a magnetic force setting condition and to a vehicle fuel system.

In general, a canister close valve (hereinafter CCV) consists of a solenoid (a magnetic circuit component) that converts electrical energy into magnetic energy, and a valve operating part that converts magnetic energy into kinetic energy to open and close a pipeline.

In particular, as CCV is applied to the vehicle's fuel system, it is applied along with the fuel tank pressure sensor to respond to the fuel system leakage (LEAK) monitoring regulation of OBD (On Board Diagnosis) laws in Korea and North America.

For example, the CCV is not directly exposed to the external environment but is connected to the atmosphere as it is mounted on the vent line and the rear end of the air filter while being located on the air vent line pipe of the fuel system.

Therefore, the CCV pipeline sealing function and operation while the vehicle is running satisfies the legal standards for the OBD diagnosis rate and is used for fuel leakage (LEAK) monitoring.

Japanese Patent Laid-Open Publication 1999-507116 (1999, 5.22)

However, CCV generates a “click”-like operating sound due to the up and down movement of the plunger due to the magnetization of the core/plunger.

In particular, raising the legal standard for the OBD diagnosis rate increases the frequency of CCV operation while driving the vehicle, thereby increasing the frequency of CCV operation noise as well, thereby increasing the likelihood that it will be perceived by drivers as CCV operation noise.

Therefore, raising the legal standard for the OBD diagnosis rate is developing into a new problem that increases the cost due to the improvement of the CCV operating noise.

In particular, it is possible to minimize the magnetic force of the CCV to solve the cost increase, but the magnetic force decrease is not applicable because it does not work due to the decrease in the initial operating force and the CCV airtight performance is not secured due to the negative pressure of the fuel tank after operation.

Accordingly, the present invention in consideration of the above points can reduce the operating noise without changing the magnetic force setting condition due to the air damping action by the diaphragm. It is an object to provide an air damping type canister close valve and vehicle fuel system that is not perceived.

The air damping type canister close valve of the present invention for achieving the above object is provided in a valve operating member that is coupled with a magnetic circuit member that converts electric energy into magnetic energy to form an internal space, and a pipeline of the valve operating member It characterized in that the diaphragm for generating an air damping effect by the air flow of the inner space and the pipe when opening and closing is included.

In a preferred embodiment, the magnetic circuit member includes a plunger that is magnetized by the electric energy and moves up and down, and a coil assembly that converts the electric energy into the magnetic energy, and the valve actuating member moves up and down together with the plunger to move the conduit. and a rod assembly for opening and closing the diaphragm, wherein the diaphragm has an air damping hole for generating the air damping effect by the air flow and moves together with the rod assembly.

In a preferred embodiment, the rod assembly includes a rod connected to the plunger and a seal enclosing the end of the rod, and the diaphragm includes a diaphragm body coupled to the seal and a perimeter of the diaphragm body to close the conduit. It consists of a diaphragm flange in which one or more air damping holes are drilled while sealing.

In a preferred embodiment, an upper body is further provided in the magnetic circuit member, and a lower body forming the conduit is further provided in the valve actuating member, and the diaphragm is in a state in which the upper body and the lower body are laser-welded together. The inner space and the conduit are separated.

In a preferred embodiment, a cap is coupled to the magnetic circuit member together with a pad for reducing an operating noise of the rod assembly.

And the vehicle fuel system of the present invention for achieving the above object includes a fuel tank for storing fuel and supplying it to the engine; a canister for collecting harmful gas of the fuel that is burned in the engine or discharged to the atmosphere after purification; A valve actuating member that is coupled with a magnetic circuit member that converts electric energy into magnetic energy with the supplied current and opens and closes a pipeline by vertical motion by converting the magnetic energy into kinetic energy; an air damping type canister close valve having a diaphragm that generates an air damping effect by an air flow formed by a pressure difference between the internal space of the valve operating member and the pipe; It is characterized in that it is included.

As a preferred embodiment, the canister close valve is provided in the atmospheric side vent line pipe connected to the canister, and is provided in the fuel tank and together with a fuel tank pressure sensor detecting fuel pressure, monitoring regulations for fuel leakage (LEAK) used for fulfillment.

The canister close valve of the present invention reduces operating noise due to the air damping action of the diaphragm, thereby reducing the cost by eliminating the noise-improving insulation structure.

In addition, by applying an air damping type canister close valve to the vehicle fuel system of the present invention, customer complaints and claims reduction are achieved by reducing CCV operation noise even during frequent CCV operation according to the increase in legal standards for OBD diagnosis rate.

1 is a block diagram of an air damping type canister close valve according to the present invention, FIG. 2 is a block diagram of a diaphragm having an air damping hole according to the present invention, and FIG. 3 is an air damping type canister close valve according to the present invention It is a block diagram of a vehicle fuel system to which a valve is applied.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying illustrative drawings, and since these embodiments are examples, those of ordinary skill in the art to which the present invention pertains may be implemented in various different forms. It is not limited to the embodiment.

Referring to FIG. 1 , the canister close valve 1 includes a magnetic circuit member 10 , a valve actuating member 20 , a cap 30 , and a diaphragm 25 .

Specifically, the magnetic circuit member 10 is composed of a solenoid that converts electric energy into magnetic energy and is coupled to the valve operating member 20 . To this end, the magnetic circuit member 10 includes an upper body 11 , a yoke 12 , a plunger 13 , a cover 14 , a coil assembly 15 , and a core 16 .

For example, the upper body 11 is coupled outside the lower body 24 to couple the magnetic circuit member 10 to the lower body 24 of the valve actuating member 20, and is made of a rectangular tube to form a coil assembly ( 15) and protect the internal parts. Here, the upper body 11 is laser-welded to the lower body 24 . The yoke 12 secures the coil assembly 15 as a magnetic circuit component. The plunger 13 is magnetized when power is applied and moves up and down. The cover 14 is wrapped with the upper body 11 to protect the internal components while configuring the main circuit. The coil assembly 15 converts electrical energy into magnetic energy, and includes a bobbin, a coil, a terminal, and an insulating member, and elastically supports the spring 21 of the valve actuating member 20 . The core 16 guides the rod up and down movement of the rod assembly 23 as a magnetic circuit component.

Specifically, the valve actuating member 20 is configured to convert magnetic energy into kinetic energy to reduce operating noise without changing the magnetic force setting condition through an air damping action while opening and closing the pipeline, and the magnetic circuit member 10 is coupled. To this end, the valve actuating member 20 includes a spring 21 , a guide 22 , a rod assembly 23 , and a lower body 24 .

For example, the spring 21 opens the conduit of the lower body 24 by pushing up the rod assembly 23 and the plunger 13 when the current is released, and is elastically supported by the coil assembly 15 and the guider 22 . do. The guider 22 guides the vertical movement of the rod assembly 23 and is coupled to the inner diameter of the cover 14 to elastically support the spring 21 . The rod assembly 23 is composed of a rod connected to the plunger 13 and a seal coupled to the diaphragm 25 while enclosing the rod end, and the lower body 24 by the vertical movement of the plunger 13. block the pipeline The lower body 24 forms a conduit to be opened or blocked by the rod assembly 23 , and is coupled to the upper body 11 to couple the valve actuating member 20 with the magnetic circuit member 10 . Here, the lower body 24 is laser welded to the upper body 11 .

Specifically, the cap 30 is coupled to the upper body 11 to fix the plunger 13 and is integrated with the magnetic circuit member 10 . The pad 30 - 1 is padded with the lower surface of the cap 30 to reduce the operating noise of the rod assembly 23 .

Specifically, the diaphragm 25 is coupled to the seal of the rod assembly 23 and seals the circumference of the conduit of the lower body 24 together with the seal, whereby the plunger 13 and the rod assembly 23 are coupled to each other. The working space is formed into a closed space. To this end, the diaphragm 25 is a diaphragm body 25a coupled with a seal, and a diaphragm flange 25b that forms a concentric circle on the diaphragm body 25a and seals around the conduit of the lower body 24 . ), and an air damping hole 25-1 drilled in a bent portion (ie, a peripheral portion) of the diaphragm flange 25b.

Therefore, the canister close valve 1 is a closed structure of the diaphragm body 25a and the diaphragm flange 25b, and the conduit space of the lower body 24 is formed with respect to the inner space of the upper body 11 and the lower body 24. While separating, the air passage structure of the air damping hole 25-1 creates an air damping effect of the air flow due to the pressure difference between the inner space and the pipeline space when opening and closing the pipeline. That is, the air damping hole 25-1 has an air damping effect as air exits or enters the conduit space or vice versa from the internal space due to the pressure difference generated by the vertical movement of the plunger 13 and the rod assembly 23. generates As a result, even if the canister close valve 1 secures sufficient magnetic force, the operation noise is greatly reduced due to the air damping effect of the air damping hole 25 - 1 of the diaphragm 25 .

Referring to FIG. 2 , an example of the layout of the air damping hole 25 - 1 for increasing the air damping effect of the diaphragm 25 can be seen. As shown, the air damping hole 25-1 is evenly drilled at an acute angle a along the circumference of the diaphragm flange 25b. In this case, the number of the air damping holes 25 - 1 depends on the angle size of the acute angle a, so the angle size is adjusted according to the specifications of the canister close valve 1 .

Referring to FIG. 3 , the fuel system 200 applied to the vehicle 100 includes a fuel tank 210 , a canister 220 , a purge valve 230 , and an air filter 240 , and the fuel system leaks. (LEAK) A canister close valve (1) and a fuel tank pressure sensor (1-1) are provided to respond to monitoring regulations. Here, the canister close valve 1 is the same as the canister close valve 1 described through FIGS. 1 and 2 .

Specifically, the canister close valve 1 is provided in the atmospheric side vent line pipe 240-1 connected to the canister 220, and the fuel tank pressure sensor 1-1 measures the fuel pressure in the fuel tank 210. It is provided in the fuel tank 210 to detect. Therefore, the sealing function of the air damping type canister close valve 1 and the detection value of the fuel tank pressure sensor 1-1 are used to satisfy the monitoring regulations for fuel leakage (LEAK).

Specifically, the fuel tank 210 supplies fuel to a fuel injector or a carburetor through a fuel line 210-1. The canister 220 collects noxious gas of fuel and sends it to the intake side vent line pipe 210-2 to supply it toward the intake manifold 110 or to supply the collected harmful gas to the atmospheric side vent line pipe line 240-1. Through the air filter 240, after purification, it is discharged to the atmosphere. The purge valve 230 is installed in the intake side vent line pipe 210 - 2 and is opened and closed under the control of an engine ECU (Electronic Control Unit).

Therefore, the fuel tank 210, the fuel line 210-1, the intake-side vent line pipe 210-2, the canister 220, the purge valve 230, and the air filter 240 are generally It is the same as the components of the fuel system.

As described above, in the vehicle fuel system according to the present embodiment, the magnetic circuit member 10 in which magnetic energy conversion of electric energy into the supplied electric current occurs, and the magnetic circuit member 10 are combined to form an internal space to generate magnetic energy. The valve operating member 20, which opens and closes the conduit by vertical movement by the kinetic energy conversion of By including an air damping type canister close valve (1) equipped with a diaphragm (25) that generates an air damping effect with flow, it is possible to reduce the operating noise caused by opening and closing the pipe without changing the magnetic force setting conditions, and in particular, OBD by reducing the operating noise Operating noise is not perceived by the driver even in frequent operation according to the increase of the legal standard for diagnosis rate.

1: Canister close valve 1-1: Fuel tank pressure sensor
10: magnetic circuit member 11: upper body
12: yoke 13: plunger
14: cover 15: coil assembly
16: core
20: valve operating member 21: spring
22: guider 23: rod assembly
24: lower body 25: diaphragm
25a: diaphragm body 25b: diaphragm flange
25-1: air damping hole
30: cap 30-1: pad
100: vehicle 110: intake manifold
200: fuel system 210: fuel tank
210-1: fuel line 210-2: intake side vent line pipe
220: canister 230: purge valve
240: air filter 240-1: atmospheric side vent line pipe

Claims (7)

It is provided in a valve operating member that is combined with a magnetic circuit member that converts electrical energy into magnetic energy to form an internal space, and generates an air damping effect due to the air flow in the internal space and the pipe when the valve operating member opens and closes the pipe. a diaphragm is included;
The magnetic circuit member includes a plunger that is magnetized with the electric energy and moves up and down, and a coil assembly that converts the electric energy into the magnetic energy, and the valve operation member moves up and down together with the plunger to open and close the conduit. A canister close valve comprising a rod assembly, wherein the diaphragm has an air damping hole for generating the air damping effect by the air flow, and moves together with the rod assembly.
delete The canister close valve according to claim 1, wherein the rod assembly includes a rod connected to the plunger and a seal surrounding an end portion of the rod, and the diaphragm is coupled to the seal.
The method according to claim 3, wherein the diaphragm comprises a diaphragm body coupled to the seal, and a diaphragm flange in which the air damping hole is drilled while forming a circumference of the diaphragm body to seal the conduit. canister close valve.
The method according to claim 1, wherein the magnetic circuit member is further provided with an upper body, the valve actuating member is further provided with a lower body forming the conduit, and the upper body and the lower body are coupled to the diaphragm to form the diaphragm. A canister close valve, characterized in that the inner space and the conduit are separated.
The canister close valve according to claim 1, wherein a cap is coupled to the magnetic circuit member together with a pad for reducing operation noise of the rod assembly.
In the vehicle fuel system to which the canister close valve according to any one of claims 1 and 3 to 6 is applied,
a fuel tank for storing fuel and supplying it to the engine;
a canister for collecting harmful gas of the fuel that is burned in the engine or discharged to the atmosphere after purification; is included,
The canister close valve is coupled to a magnetic circuit member in which magnetic energy conversion of electric energy to electric energy is generated by the supplied current, and a valve operating member that opens and closes the pipeline by vertical motion by converting the magnetic energy to kinetic energy. When the pipeline is opened and closed and a diaphragm in which an air damping effect is generated by an air flow formed by a pressure difference between the internal space of the magnetic circuit member and the valve operating member and the conduit.
Vehicle fuel system, characterized in that.

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