阅读说明：本技术 燃油通气系统 (Fuel oil aeration system ) 是由 王松 穆海宁 马国祥 范标 曹维维 吴沛奇 徐洪伟 侯金 于 2021-08-09 设计创作，主要内容包括：本发明公开了一种燃油通气系统,其包括：炭罐、炭罐吸附管路、循环管和加油限量组合阀,炭罐在入口处设置有积液腔,积液腔用于接收凝结汽油,炭罐吸附管路包括第一炭罐吸附分管、第二炭罐吸附分管和积液器,第一炭罐吸附分管与加油限量组合阀连接,第二炭罐吸附分管与炭罐和循环管连接,积液器设置在第一炭罐吸附分管和第二炭罐吸附分管之间。本发明的燃油通气系统,通过积液器贮存从加油限量组合阀泄漏出来的燃油,避免油液进入炭罐；循环管油液凝结后,通过第二炭罐吸附分管流入积液腔,积液腔内的油液不会超过有效容积,因此不会造成炭罐堵塞,在加油主管液封时,有效解决了循环管因U型结构导致油液凝结堵塞循环管存在漏诊断区域的问题。(The invention discloses a fuel oil ventilation system, which comprises: the charcoal canister adsorbs the pipeline, the circulating pipe with refuel the combination valve of limiting the amount, the charcoal canister is provided with the hydrops chamber at the entrance, the hydrops chamber is used for receiving the petrol that condenses, the charcoal canister adsorbs the pipeline and includes that first charcoal canister adsorbs the tubulation, the second charcoal canister adsorbs tubulation and hydrops ware, first charcoal canister adsorbs the tubulation and refuels the combination valve of limiting the amount and be connected, the second charcoal canister adsorbs the tubulation and is connected with charcoal canister and circulating pipe, the hydrops ware sets up and adsorbs between the tubulation and the second charcoal canister adsorbs the tubulation at first charcoal canister. According to the fuel oil ventilation system, fuel oil leaked from the fuel oil limit combination valve is stored through the liquid accumulation device, so that the oil liquid is prevented from entering the carbon canister; after circulating pipe fluid condenses, adsorb through the second canister and divide the pipe to flow in the hydrops chamber, fluid in the hydrops chamber can not exceed effective volume, consequently can not cause the canister to block up, when refueling main pipe liquid seal, has effectively solved the circulating pipe and has leaked the problem of diagnosing the region because of U type structure leads to fluid to condense to block up the circulating pipe.)

1. A fuel venting system, comprising:

charcoal canister, charcoal jar adsorb pipeline, circulating pipe and refuel the combination valve that limits the amount, wherein, the charcoal jar is provided with the hydrops chamber at the entrance, the hydrops chamber is used for receiving the condensation petrol, the charcoal jar adsorbs the pipeline and includes that first charcoal jar adsorbs the tubulation, the second charcoal jar adsorbs the tubulation and hydrops ware, first charcoal jar adsorb the tubulation with refuel the combination valve that limits the amount and connect, the second charcoal jar adsorb the tubulation with the charcoal jar with the circulating pipe is connected, the hydrops ware sets up first charcoal jar adsorb the tubulation with the second charcoal jar adsorbs between the tubulation, be used for storing the follow refuel the fuel that the combination valve that limits the amount leaked.

2. The fuel vent system of claim 1, wherein the second canister adsorption branch comprises a second canister adsorption branch body and a three-way quick-plug assembly, and the second canister adsorption branch body is connected to the canister and the circulation tube by the three-way quick-plug assembly.

3. The fuel venting system of claim 2 further comprising a fuel tank connected to the canister.

4. A fuel venting system as claimed in claim 3, wherein the canister includes a housing and the housing encloses a chamber filled with activated carbon.

5. The fuel venting system of claim 4, wherein the canister further includes an adsorption port, a desorption port, and an atmospheric port disposed outside the housing, oil vapor present in the fuel tank entering the chamber through the adsorption port, fresh air entering the chamber through the atmospheric port, and oil vapor flowing into the engine through the desorption port under the influence of air.

6. The fuel venting system of claim 5, wherein the drip chamber is disposed between the adsorption port and the housing.

7. The fuel venting system of claim 1, further comprising a fuel vapor pressure sensor for reading a pressure of the fuel system.

8. The fuel vent system of claim 1, further comprising a fuel fill main connected to the circulation tube.

9. The fuel venting system of claim 5, further comprising a canister shutoff valve connected to the atmospheric vent.

Technical Field

The invention relates to the technical field of fuel systems, in particular to a fuel ventilation system.

Background

Due to the vehicle body boundary, a U-shaped structure (as shown in fig. 1) cannot be avoided when a part of vehicle type circulating pipes are designed, oil liquid is condensed in the circulating pipes to block pipe orifices, negative pressure is extracted from an electromagnetic valve of an engine carbon tank by a negative pressure type fuel oil diagnosis mechanism, generally the negative pressure can only reach-1.5-2.5 kPa, the oil liquid cannot be taken away from the pipelines, when the oil liquid in a refueling main pipe forms a liquid seal, the pipelines between the upper part of the oil liquid in the refueling main pipe and the oil liquid accumulation part of the circulating pipes are sealed, so that the pipelines cannot be diagnosed when negative pressure type fuel oil leakage diagnosis is carried out, and the risk that the oil liquid is condensed to block the pipelines exists in the circulating pipes with the U-shaped structures.

Therefore, a need exists for a fuel venting system.

Disclosure of Invention

The invention aims to provide a fuel oil ventilation system, which aims to solve the problems in the prior art and can effectively prevent a ventilation pipeline of the fuel oil system from being blocked by fuel oil.

The invention provides a fuel oil ventilation system, which comprises:

charcoal canister, charcoal jar adsorb pipeline, circulating pipe and refuel the combination valve that limits the amount, wherein, the charcoal jar is provided with the hydrops chamber at the entrance, the hydrops chamber is used for receiving the condensation petrol, the charcoal jar adsorbs the pipeline and includes that first charcoal jar adsorbs the tubulation, the second charcoal jar adsorbs the tubulation and hydrops ware, first charcoal jar adsorb the tubulation with refuel the combination valve that limits the amount and connect, the second charcoal jar adsorb the tubulation with the charcoal jar with the circulating pipe is connected, the hydrops ware sets up first charcoal jar adsorb the tubulation with the second charcoal jar adsorbs between the tubulation, be used for storing the follow refuel the fuel that the combination valve that limits the amount leaked.

The fuel oil ventilating system as described above, wherein preferably, the second canister adsorption branch pipe includes a second canister adsorption branch pipe body and a three-way quick-plugging component, and the second canister adsorption branch pipe body is connected to the canister and the circulation pipe through the three-way quick-plugging component.

The fuel vent system as described above, wherein preferably the fuel vent system further comprises a fuel tank connected to the canister.

The fuel aeration system as described above, wherein preferably the canister includes a housing and the housing encloses a chamber filled with activated carbon.

The fuel ventilation system as described above, wherein it is preferable that the canister further includes an adsorption port, a desorption port, and an atmospheric air port provided outside the housing, the oil vapor present in the fuel tank enters the chamber through the adsorption port, fresh air enters the chamber through the atmospheric air port, and the oil vapor flows into the engine through the desorption port by the air.

The fuel breather system as described above, wherein preferably the dropdown chamber is provided between the adsorption port and the housing.

The fuel venting system as described above, wherein preferably the fuel venting system further comprises a fuel vapour pressure sensor for reading the pressure of the fuel system.

The fuel vent system as described above, wherein preferably said fuel vent system further comprises a fuel fill main connected to said circulation tube.

The fuel vent system as described above, wherein preferably the fuel vent system further comprises a canister shutoff valve connected to the atmospheric vent.

The invention provides a fuel oil ventilation system, which stores fuel oil leaked from an oil-filling limiting combination valve due to oil liquid shaking by an oil liquid storage device and prevents the oil liquid from entering a carbon tank; receive the petrol that condenses of the entrance of canister through the hydrops chamber, prevent that the petrol that condenses from getting into the canister, lead to the canister inefficacy, circulating pipe fluid condenses the back, adsorbs the branch pipe through the second canister and flows into the hydrops chamber, and fluid in the hydrops intracavity can not exceed effective volume, consequently can not cause the canister to block up, when refueling main pipe liquid seal, has effectively solved the circulating pipe and has blockked up the circulating pipe because of the U type structure condenses to have the problem of leaking the diagnosis region.

Drawings

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:

FIG. 1 is a schematic illustration of a prior art fuel venting system;

FIG. 2 is a schematic illustration of a diagnostic missing region of a prior art fuel breather system;

FIG. 3 is a schematic view of an embodiment of a fuel venting system provided by the present invention;

FIG. 4 is a schematic structural diagram of a canister adsorption circuit provided by the present invention;

FIG. 5 is a schematic structural diagram of a second canister adsorption branch pipe provided by the present invention;

FIG. 6 is a schematic structural diagram of a carbon canister provided by the present invention;

fig. 7 is a schematic diagram of a diagnosis space of the fuel vent system provided by the invention when a liquid seal is formed in a main fuel filling pipe.

Description of reference numerals:

1-carbon canister stop valve 2-fuel oil steam pressure sensor 3-carbon canister

4-carbon canister adsorption pipeline 5-circulating pipe 6-oiling limit combined valve

7-refueling main pipe 8-fuel tank 31-adsorption port

32-desorption port 33-vent atmosphere port 34-hydrops chamber

35-shell 41-first canister adsorption branch pipe 42-second canister adsorption branch pipe

43-liquid accumulation device 421-second carbon canister adsorption branch pipe body 422-three-way quick-plugging component

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

As used in this disclosure, "first", "second": and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be intervening components between the specific component and the first component or the second component. When it is described that a specific component is connected to other components, the specific component may be directly connected to the other components without having an intervening component, or may be directly connected to the other components without having an intervening component.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

As shown in FIG. 1, with a prior art fuel system vent system, the canister adsorption line, which is typically split off in front of the canister from the refueling metering combination valve, is connected to the canister and then to the canister shutoff valve, along with the recirculation line, which is connected to the refueling main. The circulating pipe of the U-shaped structure has the risk that oil condenses to block the pipeline, and after the oil condenses, the pipeline between the upper part of the oil in the main oil filling pipe and the oil accumulation part of the circulating pipe is closed, so that whether leakage exists in the area shown in fig. 2 cannot be diagnosed.

As shown in fig. 3, an embodiment of the present invention provides a fuel ventilation system, including: canister 3, canister adsorb pipeline 4, circulating pipe 5 and refuel limit combination valve 6, wherein, as shown in fig. 6, canister 3 is provided with dropsy chamber 34 at the entrance, dropsy chamber 34 is used for receiving the condensation petrol, as shown in fig. 4, canister adsorbs pipeline 4 includes that first canister adsorbs minute pipe 41, second canister adsorbs minute pipe 42 and hydrops ware 43, first canister adsorb minute pipe 41 with refuel limit combination valve 6 is connected, second canister adsorb minute pipe 42 with canister 3 with circulating pipe 5 connects, hydrops ware 43 sets up first canister adsorbs minute pipe 41 with between the second canister adsorbs minute pipe 42, is used for storing the follow refuel limit combination valve 6 leaks the fuel.

The liquid accumulator 43 can store fuel oil leaked from the refueling limiting combination valve 6 due to oil liquid shaking, and the oil liquid is prevented from entering the carbon tank 3; the condensed gasoline at the inlet of canister 3 is received by drip chamber 34, preventing the condensed gasoline from entering canister 3, resulting in canister 3 failure.

In the present invention, the effective volume of the drip chamber 34 is 15mL to 20mL, preferably 20 mL. It should be noted that the effective volumes of the effusion cell 34 and the effusion cell 43 are not particularly limited by the present invention.

As shown in fig. 3, the fuel ventilation system further includes a fuel tank 8 connected to the canister 3, a main refueling pipe 7 connected to the circulation pipe 5, a canister cut-off valve 1 connected to the vent port 33, and a fuel vapor pressure sensor 2 for reading the pressure of the fuel system.

In the working process, when the oil in the fuel system is more, when the oil in the main oil filling pipe 7 forms a liquid seal, after the oil in the circulating pipe 5 is condensed, the condensed oil flows into the liquid accumulation cavity 34 of the carbon canister 3 through the second carbon canister adsorption branch pipe 42 of the carbon canister adsorption pipeline 4, and because the condensed oil is less, the condensed oil volatilizes again in the working process, and the oil in the liquid accumulation cavity 34 of the carbon canister 3 cannot exceed the effective volume, the carbon canister 3 cannot be blocked; and the fuel leaked from the refueling limit combination valve 6 due to the oil sloshing enters the accumulator 43. When the main fuel filling pipe 7 of the fuel ventilation system is in liquid seal, the diagnosis space is as shown in figure 7, and no diagnosis area is leaked.

Therefore, compared with the prior art, the fuel ventilation system provided by the embodiment stores the fuel leaked from the fuel-filling limiting combination valve due to the shaking of the oil through the liquid accumulation device, and the oil is prevented from entering the carbon canister; receive the petrol that condenses of the entrance of canister through the hydrops chamber, prevent that the petrol that condenses from getting into the canister, lead to the canister inefficacy, circulating pipe fluid condenses the back, adsorbs the branch pipe through the second canister and flows into the hydrops chamber, and fluid in the hydrops intracavity can not exceed effective volume, consequently can not cause the canister to block up, when refueling main pipe liquid seal, has effectively solved the circulating pipe and has blockked up the circulating pipe because of the U type structure condenses to have the problem of leaking the diagnosis region.

As shown in fig. 6, the canister 3 includes a housing 35, and the housing 35 is enclosed as a chamber filled with activated carbon. The canister 3 is still including setting up the outside absorption mouth 31, desorption mouth 32 of casing 35 and the atmospheric air mouth 33 of leading to exist oil vapor in the fuel tank 8 passes through absorption mouth 31 enters into in the cavity, fresh air passes through lead to atmospheric air mouth 33 and enter into in the cavity, oil vapor passes through under the effect of air desorption mouth 32 flows to in the engine. Further, the liquid accumulation chamber 34 is provided between the adsorption port 31 and the housing 35. The condensed gasoline at the adsorption port 31 is received by the drip chamber 34, preventing the condensed gasoline from entering the canister 3, resulting in the canister 3 being deactivated.

As shown in fig. 5, the second canister adsorption branched pipe 42 includes a second canister adsorption branched pipe body 421 and a three-way quick-plugging component 422, and the second canister adsorption branched pipe body 421 is connected to the canister 3 and the circulation pipe 5 through the three-way quick-plugging component 422. Therefore, the canister adsorption pipeline 4 is connected with the canister 3 and the circulation pipe 5 through the three-way quick-plug component 422, and after the oil liquid of the circulation pipe 5 is condensed, the oil liquid flows into the liquid accumulation cavity 34 of the canister 3 through the three-way quick-plug component 422.

The working mechanism of the negative pressure type fuel leakage diagnosis system is that a carbon canister electromagnetic valve of an engine is opened, a carbon canister stop valve 1 is closed, a fuel system is in a negative pressure state at the moment, the carbon canister electromagnetic valve is closed after the pressure reaches a set pressure of-1.5 kPa to-2.5 kPa, the system enters a pressure maintaining state, a fuel vapor pressure sensor 2 reads the pressure of the fuel system at the moment, if a pressure time curve is consistent with the set curve, the system has no leakage, and if the pressure time curve is greatly different from the set curve, the system has leakage.

According to the fuel oil ventilation system provided by the embodiment of the invention, the fuel oil leaked from the fuel oil limiting combination valve due to the shaking of the oil liquid is stored by the liquid accumulation device, so that the oil liquid is prevented from entering the carbon tank; receive the petrol that condenses of the entrance of canister through the hydrops chamber, prevent that the petrol that condenses from getting into the canister, lead to the canister inefficacy, circulating pipe fluid condenses the back, adsorbs the branch pipe through the second canister and flows into the hydrops chamber, and fluid in the hydrops intracavity can not exceed effective volume, consequently can not cause the canister to block up, when refueling main pipe liquid seal, has effectively solved the circulating pipe and has blockked up the circulating pipe because of the U type structure condenses to have the problem of leaking the diagnosis region.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.