CN111060361B - Fuel system detection device and detection method thereof - Google Patents
Fuel system detection device and detection method thereof Download PDFInfo
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- CN111060361B CN111060361B CN201911299755.5A CN201911299755A CN111060361B CN 111060361 B CN111060361 B CN 111060361B CN 201911299755 A CN201911299755 A CN 201911299755A CN 111060361 B CN111060361 B CN 111060361B
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- 238000001514 detection method Methods 0.000 title claims abstract description 84
- 239000000446 fuel Substances 0.000 title claims abstract description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims description 48
- 230000008569 process Effects 0.000 claims description 43
- 238000004140 cleaning Methods 0.000 claims description 11
- 230000007423 decrease Effects 0.000 claims 2
- 239000000284 extract Substances 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 22
- 239000007789 gas Substances 0.000 description 92
- 238000004891 communication Methods 0.000 description 15
- 239000012466 permeate Substances 0.000 description 6
- 239000002828 fuel tank Substances 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- 238000010992 reflux Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013028 emission testing Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2226—Sampling from a closed space, e.g. food package, head space
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/626—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using heat to ionise a gas
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Combustion & Propulsion (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Sampling And Sample Adjustment (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
本发明公开了一种燃油系统检测装置及其检测方法，包括恒压密闭室、换热器、FID测试仪和设置在恒压密闭室内部的若干收集气袋，所述恒压密闭室用于放置燃油系统；所述换热器设置在所述恒压密闭室上；所述收集气袋设置在所述恒压密闭室内部，碳罐分别与每个所述收集气袋和所述恒压密闭室内部连通；所述FID检测仪分别连通每个所述收集气袋和所述恒压密闭室；所述恒压密闭室、所述收集气袋、所述碳罐和所述FID检测仪的连通管路上均设置有通断阀门。本发明提出一种燃油系统检测装置及其检测方法，能够在同一环境下同时进行碳罐测试和燃油系统渗透排放测试，提高测试精度和测试效率。
The present invention discloses a fuel system detection device and a detection method thereof, comprising a constant pressure sealed chamber, a heat exchanger, an FID tester and a plurality of collecting air bags arranged inside the constant pressure sealed chamber, wherein the constant pressure sealed chamber is used to place the fuel system; the heat exchanger is arranged on the constant pressure sealed chamber; the collecting air bags are arranged inside the constant pressure sealed chamber, and the carbon canister is respectively connected with each of the collecting air bags and the inside of the constant pressure sealed chamber; the FID detector is respectively connected with each of the collecting air bags and the constant pressure sealed chamber; the connecting pipelines of the constant pressure sealed chamber, the collecting air bags, the carbon canister and the FID detector are all provided with on-off valves. The present invention proposes a fuel system detection device and a detection method thereof, which can simultaneously perform a carbon canister test and a fuel system permeation emission test under the same environment, thereby improving the test accuracy and test efficiency.
Description
Technical Field
The invention relates to the technical field of automobile detection, in particular to a fuel system detection device and a detection method thereof.
Background
The fuel system provides fuel for the engine and comprises a fuel tank and a carbon tank communicated with the fuel tank. With the continuous upgrading of national requirements for automobile emission, the requirements for the test of the penetration emission of the fuel system are also higher and higher. The existing detection device can only be used for measuring the carburizing emission of a carbon tank in a fuel system or the fuel system, usually, a single closed chamber is adopted to independently measure the penetrating emission of the fuel system, or an air bag method is adopted to independently measure the carbon tank port emission, and only one of the two tests can be measured at the same time, so that the test efficiency is low, and a large amount of time and cost are wasted.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the fuel system detection device which can simultaneously perform carbon tank emission test and fuel system permeation emission test under the same environment, and improves the test precision and the test efficiency.
The invention also provides a detection method of the fuel system detection device.
According to the embodiment of the first aspect of the invention, the fuel system collecting device comprises a constant pressure closed chamber, a heat exchanger, an FID tester and a plurality of collecting air bags arranged in the constant pressure closed chamber, wherein the constant pressure closed chamber is used for placing a fuel system, the heat exchanger is arranged on the constant pressure closed chamber, the collecting air bags are arranged in the constant pressure closed chamber, a carbon tank is respectively communicated with each collecting air bag and the inside of the constant pressure closed chamber, the FID tester is respectively communicated with each collecting air bag and the constant pressure closed chamber, and on-off valves are arranged on communication pipelines of the constant pressure closed chamber, the collecting air bags, the carbon tank and the FID tester.
The fuel system collecting device at least has the following beneficial effects that the environment is simulated by utilizing the constant-pressure closed chamber and the heat exchanger, the carbon tank and the oil tank assembly are arranged in the constant-pressure closed chamber, the constant-pressure closed chamber and the carbon tank opening are respectively communicated through the FID detector, the permeate in the fuel system is discharged in the constant-pressure closed chamber, the FID detector measures the permeate discharge parameter of the fuel system by testing the gas in the constant-pressure closed chamber, in the environment conversion process, the gas bag is used for collecting the discharge in the carbon tank opening, and the discharge is sent into the FID detector for detection after inflation, so that the simultaneous discharge test of the carbon tank opening and the fuel system under the same simulation environment is realized, the test precision is ensured, the test efficiency is greatly improved, and the test is quite convenient.
According to some embodiments of the invention, the air bag collecting device further comprises an air pipe and a compressed gas conveying pipe, the FID detector is respectively communicated with each air collecting bag through an air bag detecting pipe, and the air pipe, the air bag detecting pipe and the compressed gas conveying pipe are sequentially communicated.
According to some embodiments of the invention, the air bag detection pipe or the compressed gas conveying pipe is also communicated with a vacuum pump, a valve nine is arranged between the vacuum pump and the air bag detection pipe or the compressed gas conveying pipe, and the outside of the vacuum pump is communicated with the atmosphere.
According to some embodiments of the invention, the compressed gas delivery pipe is connected with an inlet pipe and a flow meter.
According to some embodiments of the invention, the carbon tank is respectively communicated with each collecting air bag through an air bag collecting pipe, and the air pipe, the air bag collecting pipe and the compressed gas conveying pipe are sequentially communicated.
According to some embodiments of the invention, the constant pressure closed chamber comprises a box body and a movable constant pressure plate, wherein the movable constant pressure plate is arranged at the top of the box body and can move up and down, the box body and the movable constant pressure plate form a closed chamber with variable volume, and a pressure sensor is arranged in the closed chamber.
According to some embodiments of the invention, a closed cavity capacity tester is arranged outside the constant pressure closed chamber, and comprises a measuring ruler fixedly connected to the movable constant pressure plate and a zero piece arranged on the outer side wall of the box body and sleeved on the measuring ruler.
According to some embodiments of the invention, a driving motor is arranged outside the box body, and the driving motor is connected with the movable constant pressure plate through a screw pair and drives the movable constant pressure plate to move.
According to the detection method of the fuel system detection device of the second aspect of the embodiment of the invention, the detection method comprises a fuel system permeation emission detection process and a carbon tank emission detection process,
The carburization emission detection process of the fuel system comprises the following detection steps that the fuel system is placed in a constant-pressure closed chamber, an FID detector is communicated with the inside of the constant-pressure closed chamber, and gas collected in the constant-pressure closed chamber is introduced into the FID detector for detection;
The carbon tank emission detection process comprises the following detection steps of a) controlling the temperature inside a constant-pressure closed chamber to be reduced or increased by a heat exchanger, b) communicating a carbon tank opening with a collection air bag when the temperature is reduced, collecting gas discharged from the carbon tank opening by the collection air bag, communicating the carbon tank opening with the inside of the constant-pressure closed chamber when the temperature is increased, and refluxing the gas in the constant-pressure closed chamber into the carbon tank, c) communicating the gas discharged from the carbon tank opening by the collection air bag with an FID detector and introducing the gas into the FID detector for detection after the gas discharged from the carbon tank opening is collected.
The detection method of the fuel system detection device at least has the advantages that the method combines carbon tank emission detection and fuel system permeation emission detection, can simultaneously carry out carbon tank emission detection and fuel system permeation emission detection processes, improves detection precision and detection efficiency, solves the problem of inconvenience caused by independent detection, adopts a constant-pressure closed chamber and air bag structure, simultaneously detects carbon tank emission and fuel system permeation processes, ensures that carbon tank and fuel system detection are in the same environment, has higher detection precision, is more suitable for actual permeation and emission processes of an automobile fuel system, and has more accurate and effective detection and experimental data.
According to some embodiments of the invention, the canister vent detection process further includes the step of inflating the canister until the air pressure in the canister vent reaches a set value.
According to some embodiments of the invention, the method further comprises the following air bag cleaning process, wherein after the FID detector detects the air in the collected air bag, the vacuum pump pumps the air in the collected air bag, compressed air is re-introduced into the collected air bag through the compressed air conveying pipe, and the air bag is continuously pumped through the vacuum pump after being expanded, and the air bag is reciprocated for a plurality of times.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of an external structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of an internal structure of an embodiment of the present invention;
FIG. 3 is a schematic view showing an internal structure of the piping box of FIG. 2;
FIG. 4 is a schematic view of the piping box when the first collecting bag collects gas;
FIG. 5 is a schematic view of the piping box when the second collecting bag collects gas;
FIG. 6 is a schematic view of the piping box when the piping gas cleaning module cleans the air bag collecting pipe;
FIG. 7 is a schematic view of the piping box when the piping gas cleaning module cleans the air bag detecting pipe;
FIG. 8 is a schematic view of the piping box when the FID detector is connected to the first collecting bag;
FIG. 9 is a schematic view of the piping box when the FID detector is connected to the second collection bag.
Constant pressure closed chamber 100, case 110, moving constant pressure plate 120, closed chamber capacity tester 130, measuring scale 131, zero position plate 132, perspective window 140, driving motor 150, piping case 200, piping case one 201, piping case two 202, piping case three 203, piping case four 204, piping case five 205, piping case six 206, piping case seven 207, piping case 208, upper piping case 210, valve one 211, valve two 212, valve three 213, valve four 214, lower piping case 220, valve five 221, valve six 222, valve seven 223, valve eight 224, valve nine 225, two-position three-way valve one 230, two-position three-way valve two 240, compressed gas delivery pipe 250, pressure gauge 251, flow meter 252, PLC control case 260, pressure gauge 270, vacuum pump 280, collection bag 300, first collection bag 310, second collection bag 320, FID detector 400, heat exchanger 500, circulation fan 600, anemometer 610, atmosphere pipe 700, temperature sensor 800, intelligent collector 900, outer housing 910, collection pipe 911, rotating inner housing 920, connection port 921, inner tube 922, rotating motor 940, angle sensor 950, connection bearing 950
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1 and 2, a fuel system detection device according to an embodiment of the present invention will be described.
As shown in fig. 1 and 2, a fuel system detection device includes a constant pressure closed chamber 100, a heat exchanger 500, a collection air bag 300 and an FID detector 400, wherein the constant pressure closed chamber 100 is used for placing a fuel system and collecting permeated gas of the fuel system, the constant pressure in the constant pressure closed chamber 100 is atmospheric pressure, the heat exchanger 500 is used for changing the temperature of the constant pressure closed chamber 100, simulating weather changes in one day, and since the temperature of the environment changes continuously in one day, the atmospheric pressure is maintained in the process of changing the indoor temperature continuously, so that the fuel system is in the simulated environment of the external environment, permeate in the fuel system permeates into the constant pressure closed chamber 100, the collection air bag 300 is used for collecting gas discharged from a carbon tank port in the process of changing the ambient temperature, and the FID detector 400 is used for detecting gas collected in the air bag and detecting permeated gas in the constant pressure closed chamber 100. It should be noted that, the fuel system is an important component in an automobile or other mechanical vehicles, the carbon tank is a part of the fuel system, and is installed between the fuel tank and the engine, because the gasoline is a volatile liquid, the fuel tank is often filled with steam at normal temperature, and the carbon tank mainly plays a role in storing the fuel steam in the fuel tank. The carbon tank is provided with three through holes, one is communicated with the oil tank, the other is communicated with the engine, and the other is communicated with the atmosphere.
The collection air bags 300 are provided with a plurality of collection air bags 300, the number of the collection air bags 300 can be 1, can be 2 or more, the carbon tank openings are respectively communicated with the inside of each collection air bag 300 and the constant pressure airtight chamber 100, namely, the carbon tank openings and all the collection air bags 300 are respectively communicated with each other through pipelines, in addition, the carbon tank openings are also connected with the inside of the constant pressure airtight chamber 100 through another communication pipeline, on-off valves are respectively arranged on the communication pipelines of the carbon tank openings, the collection air bags 300 and the inside of the constant pressure airtight chamber 100, and the on-off valves are used for controlling the carbon tank openings to be communicated with one collection air bag 300 or the constant pressure airtight chamber 100. When the temperature in the constant pressure airtight chamber 100 is increased, the gas in the fuel system expands, the carbon tank port is controlled to be communicated with only one collecting air bag 300, other communicating pipelines are closed, the gas in the fuel system expands and is discharged through the carbon tank port, the collecting air bag 300 collects the carbon tank gas discharged at the moment, when the temperature in the constant pressure airtight chamber 100 is reduced, the gas in the fuel system contracts, the pressure in the fuel system is kept consistent with the atmospheric pressure in order to keep the pressure in the fuel system, the carbon tank port is controlled to be communicated with the inside of the constant pressure airtight chamber 100 only, and the gas in the constant pressure airtight chamber 100 flows into the carbon tank port.
The FID detector 400 is respectively connected to the inside of each collecting air bag 300 and the constant pressure airtight chamber 100, that is, the FID detector 400 and all air bags are respectively connected through a separate connecting pipeline, in addition, the FID detector 400 is also connected to the inside of the constant pressure airtight chamber 100 through another connecting pipeline, and on-off valves are respectively arranged on the connecting pipelines of the FID detector 400 and the inside of all collecting air bags 300 and the inside of the constant pressure airtight chamber 100, and are used for controlling the FID detector 400 to be connected to a certain collecting air bag 300 or the constant pressure airtight chamber 100. When a certain collecting air bag 300 collects carbon tank gas discharged from a carbon tank port, other communication pipelines connected with the FID detector 400 are closed, the FID is controlled to be only communicated with the collecting air bag 300 through an on-off valve, the discharged gas collected by the collecting air bag 300 is introduced into the FID detector 400 through the communication pipelines to be detected, and due to the fact that the penetrating discharge in the fuel system is collected in the constant-pressure closed chamber 100, when the FID detector 400 is only communicated with the inside of the constant-pressure closed chamber 100, namely, the on-off valve on the FID detector 400 which is only communicated with the inside of the constant-pressure closed chamber 100 is opened, and when other on-off valves are closed, the penetrating discharge collected in the constant-pressure closed chamber 100 is detected by the FID detector 400 to test the penetrating discharge of the fuel system.
Specifically, two collecting air bags 300 are provided in the present embodiment, two collecting air bags 300 are used for respectively collecting the exhaust gas discharged from the carbon tank, two collecting air bags 300 can be used for collecting the exhaust gas simulating the temperature rise in two days, and one collecting air bag 300 collects the exhaust gas in one day, so that the exhaust test of the carbon tank can be compared. In addition, when the number of the collection pockets 300 is 2 or more, each collection pocket 300 can be used for collecting the carbon canister discharge amount for one day as well, and the collection detection comparison is performed. The FID detector 400 is a flame ionization detector, is a high sensitivity universal detector, is responsive to almost all organic substances, is not responsive or is very responsive to inorganic substances, inert gases or substances which are not dissociated in the flame, and is a detection device used in carbon tank emission and fuel system permeation emission.
In some embodiments of the present invention, the air pipe 700 and the compressed gas delivery pipe 250 are further included, the FID detector 400 is respectively communicated with each collecting air bag 300 through an air bag detection pipe, the air pipe 700, the air bag detection pipe and the compressed gas delivery pipe 250 are sequentially communicated, the air bag detection pipe is equivalent to a delivery main pipe when all the collecting air bags 300 are communicated with the FID detector 400, a plurality of branch pipes corresponding to the collecting air bags 300 are branched on the main pipe, and an on-off valve is arranged on each branch pipe. The atmosphere pipe 700 and the compressed gas conveying pipe 250 are respectively communicated with two ends of the air bag detection pipe, compressed gas enters the air bag detection pipe from the compressed gas conveying pipe 250, residual gas in the air bag detection pipe is discharged, and the influence of the residual gas during the detection of the collected air bag 300 on the subsequent air bag detection process is avoided. The outside of the compressed gas delivery pipe 250 communicates with the air compressor, providing compressed gas to purge the gas in the communication pipe. In addition, the compressed air in the compressed air delivery pipe 250 is used for cleaning the air in the pipeline and inflating the collecting air bag 300, after the collecting air bag 300 is completely collected, the compressed air is delivered into the collecting air bag 300 through the compressed air delivery pipe 250, the collecting air bag 300 is inflated to a proper size, the air pressure in the collecting air bag 300 is kept at a constant value, the air bag volume under the constant value is constant, the FID detector 400 detects the air of the collecting air bag 300 under the air pressure, and the accurate value of carbon tank emission is obtained by detecting the concentration of the air at the moment and multiplying the volume of the collecting air bag at the moment.
In addition, the carbon tank is respectively communicated with each collecting air bag 300 through an air bag collecting pipe, the air pipe 700, the air bag collecting pipe and the compressed gas conveying pipe 250 are sequentially communicated, the air bag collecting pipe is equivalent to a collecting main pipe for all the collecting air bags 300 to be communicated with the carbon tank, a plurality of branch pipes corresponding to the collecting air bags 300 are branched out from the main pipe, and each branch pipe is provided with an on-off valve.
The atmospheric pipe 700 directly communicates with the atmosphere outside the constant pressure sealed chamber 100, and does not communicate with the inside of the constant pressure sealed chamber 100 or the collection bag 300.
Specifically, the compressed gas delivery pipe 250 is connected with a gas inlet pipe 251 and a flow meter 252, an air compressor is connected to the outside of the gas inlet pipe 251, compressed air enters the compressed gas delivery pipe 250 from the gas inlet pipe 251 and is delivered to the air pocket detection pipe, and the flow meter 252 is used for calculating the gas flow in the gas inlet pipe 251 so as to observe the delivery condition of the compressed air in the compressed gas delivery pipe 250.
In some embodiments of the present invention, the constant pressure closed chamber 100, the FID detector 400 and the air bag detection tube are communicated through a two-position three-way valve, and the two-position three-way valve can control the FID detector 400 to communicate with the air bag or communicate with the constant pressure closed chamber 100, thereby controlling the detection direction of the FID detector 400.
In some embodiments of the present invention, a circulation fan 600 is provided in the constant pressure closed chamber 100, an anemometer 610 is provided at the front side of the circulation fan 600, the anemometer 610 may be detachably installed at the front side of the circulation fan 600 through a support rod, the circulation fan 600 is provided at the side upper inside the constant pressure closed chamber 100, so that an air internal circulation is formed in the constant pressure closed chamber 100 to facilitate the gas flow in the circulation mixing environment, and the anemometer 610 is used to measure the wind speed in the circulation fan 600.
In some embodiments of the present application, the constant pressure closed chamber 100 includes a case 110 and a movable constant pressure plate 120 disposed at the top of the case 110, the case 110 and the movable constant pressure plate 120 form a closed chamber, the collection air bag 300 and the fuel system to be detected are placed in the closed chamber, a pressure sensor is disposed in the closed chamber, the pressure sensor is used to measure the air pressure in the constant pressure closed chamber, the movable constant pressure plate 120 can move at the top of the case 110, and the air volume in the constant pressure closed chamber 100 can be increased or decreased by changing the height. Because there is a gas connection between the carbon tank, the fuel system, the FID detector 400, the collection air bag 300 and the communication pipeline, and when the temperature changes, the air in the constant pressure closed chamber 100 expands or contracts, in order to keep the air pressure in the constant pressure closed chamber 100 constant, the height of the movable constant pressure plate 120 is adjusted according to the test structure of the pressure sensor, so as to adjust the gas volume in the constant pressure closed chamber 100, so that the pressure in the constant pressure closed chamber 100 is kept at a constant atmospheric pressure value, and the atmospheric environment is simulated. The movable constant pressure plate 120 can move on the top of the closed chamber through a sliding rail, and the height-adjustable function of the movable constant pressure plate 120 can be realized through other sliding mechanisms or connecting mechanisms. In addition, the constant pressure closed chamber 100 with other structures can be adopted to keep the pressure in the chamber constant, and the technical effect of the application can be achieved.
Specifically, the outside of the constant pressure airtight chamber 100 is provided with an airtight cavity capacity tester 130, the airtight cavity capacity tester 130 is used for measuring the volume of the inner space of the constant pressure airtight chamber 100, namely the volume in the airtight chamber, the airtight cavity capacity tester 130 comprises a measuring ruler 131 and a zero piece 132, the measuring ruler 131 is fixedly connected to the movable constant pressure plate 120, the movable constant pressure plate 120 can be a movable top which is hermetically sleeved on the top of the box body 110 or is hermetically embedded into the top of the box body 110, the measuring ruler 131 can be fixedly connected to the side wall of the movable constant pressure plate 120 in a screw connection manner, the outer side wall of the box body 110 is provided with a zero piece 132 matched with the measuring ruler 131, the zero piece 132 is fixedly connected to the box body 110, a groove is formed in the middle of the zero piece 132, a through hole is formed between the groove and the outer side wall of the box body 110, the measuring ruler 131 passes through the through hole, and the zero piece 132 is sleeved on the measuring ruler 131. The zero piece 132 is provided with a zero line, the measuring ruler 131 is provided with scale marks of the volume of the closed chamber, and the zero line is used for reading the reading on the measuring ruler 131 to measure the volume of the closed chamber at the moment.
More specifically, a driving motor 150 is arranged on the outer side of the box body 110, the driving motor 150 is connected with the movable constant pressure plate 120 through a screw pair and drives the movable constant pressure plate 120 to move, a screw rod penetrates through the movable constant pressure plate 120 and is in threaded connection with the movable constant pressure plate 120, and the driving motor 150 is a servo motor for driving one of the preferable structures of the movable constant pressure plate 120 to move, so that the accurate control process can be realized.
In some embodiments of the present invention, the communication pipe is further connected to a pressure gauge 270, and the pressure gauge 270 is used for measuring the air pressure in the communication pipe, and detecting whether the air pressure is in a normal state. In this embodiment, two pressure gauges 270 are provided to test the air pressure in the air bag detecting tube and the air bag collecting tube, respectively, and when the collecting air bag 300 is communicated with the air bag detecting tube or the air bag collecting tube, the air pressure detected by the two pressure gauges 270 is the air pressure of the air bag in the collecting air bag 300. The pressure gauge 270 is matched with the compressed gas delivery pipe 250, the compressed gas delivery pipe 250 delivers compressed air to the collecting bag 300 which has collected the carbon tank emissions, the pressure gauge 270 detects the pressure in the collecting bag 300, and the compressed gas delivery pipe 250 is closed when the gas pressure in the collecting bag 300 reaches a set value, so that the collecting bag 300 is not inflated any more. The gas pressure inside the inflated collecting bag 300 is the same, and the gas in the collecting bag 300 is then sent to the FID detector 400 for detection, and the concentration of the discharged material is measured, so as to obtain the result of the carbon tank discharge test.
Specifically, the air bag detection tube or the air bag collecting tube is communicated with a vacuum pump 280, and the vacuum pump 280 is used for pumping the air in the air bag 300, so that the air bag 300 can be cleaned conveniently and the air bag collecting process of the next round can be carried out.
In some embodiments of the present invention, the constant pressure closed chamber 100 is provided with a perspective window 140, and the perspective window 140 is used to observe the internal condition of the constant pressure closed chamber 100.
In some embodiments of the present invention, the heat exchanger 500 is disposed at an inner sidewall of the constant pressure closed chamber 100 to exchange heat with an external environment to regulate a temperature in the constant pressure closed chamber 100, and a temperature sensor 800 is disposed in the constant pressure closed chamber 100, and the temperature sensor 800 is used to measure the temperature in the constant pressure closed chamber 100.
In some embodiments of the present invention, the on-off valve may be a single-pass electromagnetic valve or a two-position three-way electromagnetic valve, and the electromagnetic valve may be controlled by the PLC control box 260 to control the communication relationship among the constant pressure closed chamber 100, the FID detector 400, the collection air bag 300, the carbon tank and the pipeline gas cleaning component, so that the control is accurate, and an automatic detection process is realized.
Specifically, referring to fig. 3, the communication relationship between the respective components is achieved in the constant pressure closed chamber 100 by a piping box 200. The pipeline box 200 comprises an upper pipeline 210 and a lower pipeline 220, four branch pipes 201, two branch pipes 202, three branch pipes 203 and four branch pipes 204 which are independently communicated with the upper pipeline 210 and the lower pipeline 220 are arranged between the upper pipeline 210 and the lower pipeline 220 side by side, the middle parts of the branch pipes 201, the two branch pipes 202, the three branch pipes 203 and the four branch pipes 204 are respectively communicated with an atmospheric pipe 700, a first collecting air bag 310, a second collecting air bag 320 and a compressed gas conveying pipe 250, a valve one 211, a valve two 212, a valve three 213 and a valve four 214 are respectively arranged between the branch pipes 201, 202, 203 and 204 and the upper pipeline 210, and a valve five 221, a valve six 222, a valve seven 223 and a valve eight 224 are respectively arranged between the pipeline box and the lower pipeline 220. The upper pipeline 210 is provided with a branch pipe five 205 communicated with a carbon tank port, a two-position three-way valve one 230 is arranged between the branch pipe five 205 and the upper pipeline 210, the other communication port of the two-position three-way valve one 230 is communicated with the inside of the constant pressure closed chamber 100, the lower pipeline 220 is provided with a branch pipe six 206 communicated with the FID detector 400, the vacuum pump 280 is provided with a branch pipe eight 208 communicated with the branch pipe six 206, the branch pipe eight 208 is provided with a valve nine 225, the FID detector 400 is also provided with a branch pipe seven 207 communicated with the constant pressure closed chamber 100, and two-position three-way valves two 240 are arranged among the branch pipe six 206, the branch pipe seven 207 and the FID detector 400. The method comprises the steps of air bag collecting process, air bag detecting process, air reflux process, penetrating emission detecting process and pipeline cleaning process.
When heating, the air bag collecting process comprises the following steps:
Referring to fig. 4, valve two 212 is opened, two-position three-way valve one 230 controls the communication of the canister port with upper pipe 210 to allow the canister port to communicate with first collection bag 310, first collection bag 310 collects the gas discharged from the canister port, and referring to fig. 5, valve three 213 is opened, two-position three-way valve one 230 controls the communication of the canister port with upper pipe 210 to allow the canister port to communicate with second collection bag 320, and second collection bag 320 collects the gas discharged from the canister port.
The air bag detection process comprises the following steps:
Referring to fig. 8, if the exhaust gas is collected in the first collecting bag 310, the valve six 222 is opened, the two-position three-way valve two 240 controls the branch pipe six 206 to communicate with the FID detector 400 so that the first collecting bag 310 communicates with the FID detector 400, the collected gas in the first collecting bag 310 enters the FID detector 400 to be detected, and referring to fig. 9, if the exhaust gas is collected in the second collecting bag 320, the valve seven 223 is opened, the two-position three-way valve two 240 controls the branch pipe six 206 to communicate with the FID detector 400 so that the second collecting bag 320 communicates with the FID detector 400, and the collected gas in the second collecting bag 320 enters the FID detector 400 to be detected. The above process is a carbon canister emissions detection process.
Before the gas in the first collecting bag 310 is introduced into the FID detector 400, an air bag expansion process is required, referring to fig. 3, because the concentration of the gas detected in the FID detector 400 is detected, the second valve 212, the fourth valve 214, the sixth valve 222, and the eighth valve 224 are opened, the compressed gas delivery pipe 240 is communicated with the first collecting bag 310, the compressed gas delivery pipe 250 delivers the compressed air into the first collecting bag 310, the first collecting bag 310 is expanded until the air pressure in the first collecting bag 310 reaches a set value, and the valve is closed, so that the first collecting bag 310 is expanded to an appropriate size. Similarly, before the gas in the second collection bag 320 is introduced into the FID detector 400, a bag expansion process is required, the third valve 213, the fourth valve 214, the seventh valve 223, and the eighth valve 224 are opened, the compressed gas delivery pipe 240 is communicated with the second collection bag 320, the compressed gas delivery pipe 250 delivers the compressed air into the second collection bag 320, the second collection bag 320 is expanded until the gas pressure in the second collection bag 320 reaches a set value, and the valve is closed, so that the second collection bag 320 is expanded to a proper size at this time.
After the FID detector 400 detects the concentration of the discharged matter, the discharged amount is obtained by a product formula of the volume of the collection bag 300.
After the detection of the emissions in the collection bag 300 is completed, the gas in the collection bag 300 needs to be cleaned:
Referring to fig. 3, the valve six 222 and the valve nine 225 are opened, the first collection air bag 310 is communicated with the vacuum pump 280, the vacuum pump 280 pumps the air in the first collection air bag 310 out of the constant pressure closed chamber 100, then the valve two 212, the valve four 214 or the valve six 222 and the valve eight 224 are opened, compressed air is introduced into the first collection air bag 310 to expand the air bags, and after the air bags are expanded, the air in the first collection air bag 310 is pumped out through the vacuum pump 280, and the process is repeated for a plurality of times until the cleaning of the first collection air bag 310 is completed. By doing so, the gas in the second collection bag 320 is purged.
When cooling, the gas reflux process is as follows:
Referring to fig. 3, a two-position three-way valve 230 connects the constant pressure closed chamber 100 with the carbon canister, and the gas in the carbon canister contracts during the temperature reduction process, so as to protect the constant pressure process in the carbon canister and prevent the exhaust gas collected by the collection air bag 300 from flowing back into the carbon canister, and the gas for flowing back flows back from the constant pressure closed chamber 100 into the carbon canister.
And (3) osmotic emission detection process:
Referring to fig. 3, when the two-position three-way valve blocks the communication between the six branch pipe 206 and the FID detector 400 is communicated with the constant pressure closed chamber 100, the FID detector 400 detects the air in the constant pressure closed chamber 100, and the fuel system permeates into the constant pressure closed chamber 100 due to the flow of the fuel vapor permeated in the fuel system, and at this time, the FID detector 400 detects the permeate of the fuel system. The above process is a fuel system osmotic emission testing process.
Pipeline cleaning process:
Referring to fig. 6, the first and fourth valves 211 and 214 are opened, compressed gas enters the upper pipe 210 through the compressed gas delivery pipe 250 to clean residual gas in the upper pipe 210 and then flows out of the atmosphere 700 to complete the cleaning process of the upper pipe 210, and referring to fig. 7, the fifth and eighth valves 221 and 224 are opened, compressed gas enters the lower pipe 220 through the compressed gas delivery pipe 250 to clean residual gas in the lower pipe 220 and then flows out of the atmosphere 700 to complete the cleaning process of the lower pipe 220.
It should be noted that, the upper pipe 210 is an air bag collecting pipe, the lower pipe 220 is an air bag detecting pipe, and the valves one 211 to nine 225 are all single-pass solenoid valves.
The detection process is convenient to detect, the whole device collects the carbon tank exhaust gas and the fuel system permeation exhaust gas through simulating environmental changes, the exhaust gas is detected simultaneously, the carbon tank and the fuel system are detected under the same temperature and air pressure conditions, the detection precision is improved, the influence on the fuel system and the carbon tank caused by the environment is reduced, and the test is very convenient.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (5)
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| CN115236169A (en) * | 2022-07-20 | 2022-10-25 | 中国环境科学研究院 | A kind of detection method of hydrocarbon emission in fuel vapor of automobile activated carbon canister |
| CN115561399A (en) * | 2022-09-22 | 2023-01-03 | 东风汽车集团股份有限公司 | Testing arrangement and test equipment that charcoal jar discharged |
| CN117538202B (en) * | 2024-01-10 | 2024-04-09 | 中汽研汽车检验中心（天津）有限公司 | Method and device for distinguishing contribution amounts of different parts to oiling emission |
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