CN111060361A - Fuel system detection device and detection method thereof - Google Patents
Fuel system detection device and detection method thereof Download PDFInfo
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- CN111060361A CN111060361A CN201911299755.5A CN201911299755A CN111060361A CN 111060361 A CN111060361 A CN 111060361A CN 201911299755 A CN201911299755 A CN 201911299755A CN 111060361 A CN111060361 A CN 111060361A
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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
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- 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
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- 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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Abstract
The invention discloses a fuel system detection device and a detection method thereof, wherein the fuel system detection 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 chambers, and the carbon tanks are respectively communicated with the collecting air bags and the interiors of the constant-pressure closed chambers; the FID detector is respectively communicated with each collecting air bag and the constant-pressure closed chamber; constant pressure sealed chamber collect the air pocket the carbon tank with all be provided with the break-make valve on communicating pipeline of FID detector. The invention provides a fuel system detection device and a detection method thereof, which can simultaneously perform carbon tank test and fuel system permeation emission test in the same environment, and improve the test precision and the 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 supplies fuel for the engine and comprises a fuel tank and a carbon tank communicated with the fuel tank. With the continuous upgrade of the national requirements on the automobile emission, the test requirements on the permeation emission of the fuel system are higher and higher. The existing detection device can only aim at the carburization discharge test of a carbon tank or a fuel system in the fuel system, usually, a single sealed chamber is adopted to independently measure the permeation discharge of the fuel system, or the carbon tank opening discharge is independently measured by an air bag method, only one of two tests can be measured at the same time, the test efficiency is low, and a large amount of time and cost are wasted.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the fuel system detection device provided by the invention can be used for simultaneously carrying out carbon tank emission test and fuel system permeation emission test in the same environment, and improving the test precision and test efficiency.
The invention also provides a detection method of the fuel system detection device.
The fuel system collecting device comprises a constant-pressure closed chamber, a heat exchanger, a FID tester and a plurality of collecting air bags arranged inside 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 chambers, and the carbon tanks are respectively communicated with the collecting air bags and the interiors of the constant-pressure closed chambers; the FID detector is respectively communicated with each collecting air bag and the constant-pressure closed chamber; constant pressure sealed chamber collect the air pocket the carbon tank with all be provided with the break-make valve on communicating pipeline of FID detector.
The fuel system collecting device provided by the embodiment of the invention at least has the following beneficial effects: utilize constant voltage sealed chamber and heat exchanger simulation environment, arrange carbon tank and oil tank subassembly in the constant voltage sealed chamber, communicate constant voltage sealed chamber and carbon tank mouth respectively through the FID detector, permeate discharge in the fuel oil system is in the constant voltage sealed chamber, the FID detector is through the infiltration discharge parameter of the gaseous fuel oil system of measuring in the constant voltage sealed chamber of test, in the environment transform process, collect the emission in the air pocket collection carbon tank mouth, it detects in sending into the FID detector with the emission after aerifing the inflation, the emission test when carbon tank mouth and fuel oil system under same simulation environment has been realized, the test accuracy has been guaranteed, the efficiency of software testing is greatly improved, it is very convenient to test.
According to some embodiments of the invention, the device further comprises an atmospheric pipe and a compressed gas delivery pipe, the FID detector is respectively communicated with each collecting air bag through an air bag detection pipe, and the atmospheric pipe, the air bag detection pipe and the compressed gas delivery pipe are sequentially communicated.
According to some embodiments of the present invention, the air bag detection tube/compressed air delivery tube is further connected to a vacuum pump, a valve nine is disposed between the vacuum pump and the air bag detection tube/compressed air delivery tube, and the outside of the vacuum pump is connected to the atmosphere.
According to some embodiments of the invention, an intake pipe and a flow meter are connected to the compressed gas delivery pipe.
According to some embodiments of the invention, the canister is in communication with each of the collection air bags through an air bag collection tube, the atmospheric tube, the air bag collection tube and the compressed gas delivery tube being in communication in sequence.
According to some embodiments of the present invention, the constant pressure closed chamber comprises a box body and a movable constant pressure plate, the movable constant pressure plate is arranged on 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 a variable volume, and a pressure sensor is arranged in the closed chamber.
According to some embodiments of the present invention, a closed cavity capacity tester is disposed outside the constant pressure closed chamber, and the closed cavity capacity tester includes a measuring ruler fixedly connected to the movable constant pressure plate and a zero position sheet disposed on an outer sidewall of the box body and covering 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 rod pair and drives the movable constant pressure plate to move.
The detection method of the fuel system detection device according to the second aspect of the invention comprises a fuel system permeation emission detection process and a carbon tank emission detection process,
the fuel system carburized emission detection process comprises the following detection steps: the fuel oil system is placed in the constant-pressure closed chamber, the 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: a) the heat exchanger controls the temperature in the constant-pressure closed chamber to be reduced or increased; b) when the temperature is reduced, the carbon tank opening is communicated with a collecting air bag, the collecting air bag collects gas discharged from the carbon tank opening, when the temperature is increased, the carbon tank opening is communicated with the inside of the constant-pressure closed chamber, and the gas in the constant-pressure closed chamber flows back to the carbon tank; c) and after the gas discharged from the carbon tank port is collected by the gas bag, the gas bag is communicated with the FID detector and the gas is introduced into the FID detector for detection.
The detection method of the fuel system detection device provided by the embodiment of the invention at least has the following beneficial effects: the method integrates the carbon tank emission detection and the fuel system osmotic emission detection together, can simultaneously carry out the carbon tank emission detection and the fuel system osmotic emission detection, improves the detection precision and the detection efficiency, and solves the problem of inconvenience caused by separate detection; adopt constant voltage sealed chamber and air pocket structure, detect the infiltration process that carbon-tank discharged and fuel oil system simultaneously, guaranteed that carbon-tank and fuel oil system detect under the same environment, it is higher to detect the precision, more laminates automobile fuel oil system's actual infiltration and discharge process, detects and experimental data is more accurate effective.
According to some embodiments of the invention, the canister emission detection process further comprises the following air bag inflation step: the compressed air conveying pipe conveys the compressed air to the air collecting bag until the air pressure in the air collecting bag reaches a set value.
According to some embodiments of the invention, the following air bag cleaning process is also included: after the FID detector detects the gas in the collecting gas bag, the vacuum pump pumps the gas in the collecting gas bag, compressed air is introduced into the collecting gas bag again through the compressed air conveying pipe, and the gas is continuously pumped through the vacuum pump after expansion for many times.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is an external structural view of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the internal structure of the embodiment of the present invention;
FIG. 3 is a schematic view showing the internal structure of the piping box shown in FIG. 2;
FIG. 4 is a schematic view of the structure of the manifold box when the first collection bag collects gas;
FIG. 5 is a schematic view of the structure of the duct box when the second collection air pocket collects gas;
FIG. 6 is a schematic view of the configuration of the manifold box as the manifold gas purging assembly purges the gas bag collection tubes;
FIG. 7 is a schematic structural view of the manifold box when the manifold gas purge assembly purges the air bag sense tubes;
FIG. 8 is a schematic structural view of the duct box when the FID detector is in communication with the first collection bag;
FIG. 9 is a schematic structural view of the piping box when the FID detector communicates with the second collection bag.
The device comprises a constant-pressure closed chamber 100, a box body 110, a movable constant-pressure plate 120, a closed cavity capacity tester 130, a measuring scale 131, a zero position sheet 132, a perspective window 140, a driving motor 150, a pipeline box 200, a branch pipe I201, a branch pipe II 202, a branch pipe III 203, a branch pipe IV 204, a branch pipe V205, a branch pipe VI 206, a branch pipe VII 207, a branch pipe 208, an upper pipeline 210, a valve I211, a valve II 212, a valve III 213, a valve IV 214, a lower pipeline 220, a valve V221, a valve VI 222, a valve VII 223, a valve VIII, a valve VII, a valve IV 230, a two-position three-way valve II 240, a compressed gas delivery pipe 250, a pressure gauge 251, a flow meter 252, a PLC control box 260, a pressure gauge 270, a vacuum pump, a collection air bag 300, a first, Collecting pipe 911, rotary inner shell 920, connecting port 921, inner pipe 922, rotary motor 930, angle sensor 940, connecting bearing 950
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood 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 otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, a fuel system detection device according to an embodiment of the present invention will be described below.
As shown in fig. 1 and 2, a fuel system detecting apparatus includes a constant pressure closed chamber 100, a heat exchanger 500, a collecting air bag 300, and a FID detector 400, the constant pressure closed chamber 100 is used for placing a fuel system and collecting permeation 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 the weather change of a day, since the temperature of the environment is constantly changed during the day, the atmospheric pressure is kept in the process of continuously changing the indoor temperature, so that the fuel system is in the simulated environment of the external environment, the permeate in the fuel system permeates into the constant pressure closed chamber 100, the collecting air bag 300 is used for collecting the gas exhausted from the carbon tank opening in the process of environmental temperature change, and the FID detector 400 is used for detecting the gas collected in the air bag and detecting the gas permeated from the constant pressure closed chamber 100. It should be noted that the fuel system is an important component of an automobile or other mechanical vehicles, and the carbon canister is a part of the fuel system and is installed between the fuel tank and the engine. The carbon tank is provided with three ports, one is communicated with the oil tank, the other is communicated with the engine, and the other is communicated with the atmosphere.
The collecting air bags 300 are provided with a plurality of collecting air bags 300, the number of the collecting air bags 300 can be 1, the collecting air bags can be more than 2 or 2, the carbon tank openings are respectively communicated with the insides of the collecting air bags 300 and the constant-pressure sealed chamber 100, namely the carbon tank openings and all the collecting air bags 300 are respectively provided with a communication pipeline, in addition, the carbon tank openings are also connected with the inside of the constant-pressure sealed chamber 100 through another communication pipeline, the carbon tank openings are respectively provided with an on-off valve on the communication pipeline between the collecting air bags 300 and the inside of the constant-pressure sealed chamber 100, and the on-off valves are used for controlling the carbon tank openings to be communicated with the collecting air bags. When the temperature in the constant-pressure closed chamber 100 rises, the gas in the fuel system expands, the carbon tank opening is controlled to be only communicated with a certain collecting air bag 300, other communicating pipelines are closed, the gas in the fuel system expands and is discharged through the carbon tank opening, and the collecting air bag 300 collects the carbon tank gas discharged at the moment; when the temperature in the constant-pressure sealed chamber 100 is reduced, the gas in the fuel system contracts, in order to keep the air pressure in the fuel system consistent with the atmospheric pressure, the carbon tank opening is controlled to be only communicated with the inside of the constant-pressure sealed chamber 100, and the gas in the constant-pressure sealed chamber 100 flows into the carbon tank opening.
The FID detector 400 is respectively communicated with the insides of each collecting air bag 300 and the constant-pressure sealed chamber 100, namely the FID detector 400 and all the air bags are respectively provided with a communication pipeline, in addition, the FID detector 400 is also communicated with the insides of the constant-pressure sealed chamber 100 through another communication pipeline, the FID detector 400, all the collecting air bags 300 and the communicating pipelines inside the constant-pressure sealed chamber 100 are respectively provided with an on-off valve, and the on-off valves are used for controlling the FID detector 400 to be communicated with a certain collecting air bag 300 or the constant-pressure sealed chamber 100. After a certain collecting air bag 300 collects the carbon tank gas exhausted from the 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 a stop valve, and the exhaust gas collected by the collecting air bag 300 is introduced into the FID detector 400 through the communication pipelines for detection; because the constant-pressure closed chamber 100 collects the permeation emission in the fuel system, when the FID detector 400 is only communicated with the inside of the constant-pressure closed chamber 100, that is, 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 the other on-off valves are closed, the FID detector 400 detects the permeation emission collected in the constant-pressure closed chamber 100, and the permeation emission of the fuel system is tested.
Specifically, the two collecting air bags 300 in the embodiment are provided, two collecting air bags 300 are used for respectively collecting the gas exhausted from the carbon tank opening, two collecting air bags 300 can be used for collecting the exhaust gas when the temperature is raised in two simulated days, and one collecting air bag 300 collects the exhaust gas in one day so as to facilitate the exhaust test and comparison process of the carbon tank opening. In addition, when the number of the collecting air bags 300 is more than 2, each collecting air bag 300 can be used for collecting the carbon tank discharge amount for one day to perform collection, detection and comparison. The FID detector 400 is a flame ionization detector, a high sensitivity general purpose detector, which responds to almost all organic substances, but does not respond or responds very little to inorganic substances, inert gases, or non-dissociated substances in the flame, and is a detection device used in canister emissions and fuel system permeation emissions.
In some embodiments of the present invention, the apparatus further includes an atmospheric tube 700 and a compressed gas delivery tube 250, the FID detector 400 is respectively communicated with each collection air bag 300 through an air bag detection tube, the atmospheric tube 700, the air bag detection tube, and the compressed gas delivery tube 250 are sequentially communicated, the air bag detection tube is equivalent to a delivery main tube when all the collection air bags 300 are communicated with the FID detector 400, the main tube branches a plurality of branch tubes corresponding to the collection air bags 300, and each branch tube is provided with an on-off valve. The atmospheric 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 generated when the air bag 300 is collected to detect on the subsequent air bag detection process is avoided. The compressed gas delivery pipe 250 is externally communicated with an air compressor to provide compressed gas for cleaning the gas in the communication pipe. Besides, the compressed air in the compressed air delivery pipe 250 is used for cleaning the gas in the pipeline and also used for carrying out the inflation process in the collecting air bag 300, after the collecting air bag 300 is 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 pressure value is constant, the FID detector 400 detects the gas of the collecting air bag 300 under the air pressure, and the accurate value of the carbon tank emission is obtained by detecting the gas concentration at the moment and multiplying the volume of the collecting air bag at the moment.
In addition, the carbon canister is respectively communicated with each collecting air bag 300 through an air bag collecting pipe, the atmosphere 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 communicating all the collecting air bags 300 with the carbon canister, a plurality of branch pipes corresponding to the collecting air bags 300 are branched from the main pipe, and each branch pipe is provided with an on-off valve.
The atmosphere pipe 700 is directly connected to the atmosphere outside the constant-pressure sealed chamber 100, and is not connected to the inside of the constant-pressure sealed chamber 100 or the collection bag 300.
Specifically, the compressed air delivery pipe 250 is connected with an air inlet pipe 251 and a flow meter 252, the air inlet pipe 251 is externally connected with an air compressor, compressed air enters the compressed air delivery pipe 250 through the air inlet pipe 251 and is delivered to the air bag detection pipe, and the flow meter 252 is used for calculating the air flow in the air inlet pipe 251 so as to observe the delivery condition of the compressed air in the compressed air delivery pipe 250.
In some embodiments of the present invention, the constant pressure sealed chamber 100, the FID detector 400, and the air bag detection tube are connected by a two-position three-way valve, which can control the FID detector 400 to be connected to the air bag or to the constant pressure sealed chamber 100, thereby controlling the detection direction of the FID detector 400.
In some embodiments of the present invention, the circulation fan 600 is disposed in the constant pressure sealed chamber 100, the anemometer 610 is disposed on the front side of the circulation fan 600, the anemometer 610 can be detachably connected to the front side of the circulation fan 600 through a support rod, the circulation fan 600 is disposed on the upper side of the inside of the constant pressure sealed chamber 100, so that an air inner circulation is formed in the constant pressure sealed chamber 100, which facilitates the flow of air in the circulation mixing environment, and the anemometer 610 is used for measuring the wind speed in the circulation fan 600.
In some embodiments of the present invention, the constant pressure closed chamber 100 includes a box body 110 and a movable constant pressure plate 120 disposed on the top of the box body 110, the box body 110 and the movable constant pressure plate 120 form a closed chamber, the collecting air bag 300 and the fuel system to be detected are both disposed in the closed chamber, a pressure sensor is disposed in the closed chamber, the pressure sensor is used for measuring the air pressure in the constant pressure closed chamber, and the movable constant pressure plate 120 can move on the top of the box body 110 to increase or decrease the gas volume in the constant pressure closed chamber 100 by changing the height. Because there is gaseous handing-over between carbon canister, fuel oil system, FID detector 400, collection air pocket 300 and the communicating pipe, and when the temperature variation, the air in the airtight chamber of constant pressure 100 can expand or contract, for keeping the atmospheric pressure in the airtight chamber of constant pressure 100 invariable, the height of the constant pressure board 120 of removal is adjusted to the test structure adjustment of pressure sensor to the gas volume in the airtight chamber of adjustment constant pressure 100 for the pressure in the airtight chamber of constant pressure 100 keeps under a invariable atmospheric pressure value, simulates out atmospheric environment. The movable constant pressure plate 120 can move on the top of the closed chamber through a slide rail, and the height of the movable constant pressure plate 120 can be adjusted through other sliding mechanisms or connecting mechanisms. In addition, the constant-pressure sealed 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 airtight chamber capacity tester 130 that is equipped with of constant voltage airtight chamber 100, airtight chamber capacity tester 130 is used for measuring the inner space volume of constant voltage airtight chamber 100, volume in the airtight chamber promptly, airtight chamber capacity tester 130 includes dipperstick 131 and zero bit piece 132, dipperstick 131 fixed connection is on removing constant pressure board 120, remove constant pressure board 120 and can be for the sealed removal top of cup jointing at box 110 top or sealed embedding box 110 top, dipperstick 131 accessible screw connection's mode fixed connection is at removing constant pressure board 120 lateral wall, box 110 lateral wall is equipped with zero bit piece 132 with dipperstick 131 matched with, zero bit piece 132 fixed connection box 110 is last, zero bit piece 132 middle part is equipped with the recess, form an opening between this recess and the box 110 lateral wall, dipperstick 131 passes the opening, zero bit piece 132 cover is on dipperstick 131. The zero-position sheet 132 is provided with a zero-position line, the measuring scale 131 is provided with a scale mark for the volume of the closed chamber, and the zero-position line is used for reading the reading on the measuring scale 131 to measure the volume of the closed chamber at the moment.
More specifically, the driving motor 150 is disposed outside the box body 110, the driving motor 150 is connected to the movable constant pressure plate 120 through a screw pair and drives the movable constant pressure plate 120 to move, the screw passes 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 and can realize a precise control process.
In some embodiments of the present invention, the communication pipe is further communicated with a pressure gauge 270, and the pressure gauge 270 is configured to measure an air pressure inside the communication pipe and detect whether the air pressure is in a normal state. In this embodiment, two pressure gauges 270 are provided to respectively measure the air pressure in the air bag detecting tube and the air bag collecting tube, and when the 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 in the air bag 300. The pressure gauge 270 is matched with the compressed air delivery pipe 250, the compressed air delivery pipe 250 delivers the compressed air to the collection air bag 300 which collects the carbon tank emissions, the pressure gauge 270 detects the pressure in the collection air bag 300, and when the gas pressure in the collection air bag 300 reaches a set value, the compressed air delivery pipe 250 is closed, and the collection air bag 300 is not inflated any more. When the internal pressure of the inflated collection bag 300 is the same, the gas in the collection bag 300 is transmitted to the FID detector 400 for detection, and the emission concentration is measured, so as to obtain the test result of the carbon canister emission.
Specifically, the air bag detection tube/air bag collection tube is communicated with a vacuum pump 280, and the vacuum pump 280 is used for pumping away the gas in the collection air bag 300, so that the collection air bag 300 can be cleaned conveniently and the next air bag collection process can be performed conveniently.
In some embodiments of the present invention, the constant pressure airtight chamber 100 is provided with a transparent window 140, and the transparent window 140 is used to observe the internal condition of the constant pressure airtight chamber 100.
In some embodiments of the present invention, the heat exchanger 500 is disposed at an inner sidewall of the constant pressure hermetic chamber 100 to exchange heat with an external environment to regulate a temperature in the constant pressure hermetic chamber 100, and the temperature sensor 800 is disposed in the constant pressure hermetic chamber 100, and the temperature sensor 800 is used to measure the temperature in the constant pressure hermetic chamber 100.
In some embodiments of the present invention, the on-off valve may be a single-way solenoid valve or a two-position three-way solenoid valve, and the solenoid valve may be controlled by the PLC control box 260 to control the communication relationship among the constant-pressure sealed chamber 100, the FID detector 400, the collection air bag 300, the carbon canister, and the pipeline gas cleaning assembly, so that the control is accurate and the automatic detection process is realized.
Specifically, referring to fig. 3, the constant pressure sealed chamber 100 is communicated with each other through a piping box 200. The pipe box 200 comprises an upper pipe 210 and a lower pipe 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 pipe 210 and the lower pipe 220 are arranged between the upper pipe 210 and the lower pipe 220 side by side, the middle parts of the branch pipes 201, the branch pipes 202, the three branch pipes 203 and the four branch pipes 204 are respectively communicated with an atmosphere pipe 700, a first collecting air bag 310, a second collecting air bag 320 and a compressed gas conveying pipe 250, a valve 211, a valve two 212, a valve three 213 and a valve four 214 are respectively arranged between the branch pipes 201, the second branch pipes 202, the third branch pipes 203 and the four branch pipes 204 and the upper pipe 210, and a valve five 221, a valve six 222, a valve seven 223 and a valve eight 224 are respectively arranged between the upper pipe 210 and the lower pipe. The upper pipeline 210 is provided with a branch pipe five 205 communicated with the 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 sealed 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 further provided with a branch pipe seven 207 communicated with the constant-pressure sealed chamber 100, and a two-position three-way valve two 240 is arranged among the branch pipe six. The specific implementation process comprises an air bag collecting process, an air bag detecting process, a gas backflow process, a permeation emission detecting process and a pipeline cleaning process.
And during temperature rise, the air bag collecting process:
referring to fig. 4, the second valve 212 is opened, the first two-position three-way valve 230 controls the carbon tank opening to communicate with the upper pipeline 210, so that the carbon tank opening communicates with the first collecting air bag 310, and the first collecting air bag 310 collects the gas discharged from the carbon tank opening; referring to fig. 5, a valve three 213 is opened, and a two-position three-way valve one 230 controls the communication between the canister port and the upper pipe 210, so that the canister port communicates with a second collecting bag 320, and the second collecting bag 320 collects the gas discharged from the canister port.
And (3) air bag detection process:
referring to fig. 8, if the first collection air bag 310 has collected the exhaust gas, 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 collection air bag 310 communicates with the FID detector 400, and the collected gas in the first collection air bag 310 enters the FID detector 400 for detection; referring to fig. 9, if the second collection bag 320 has collected the exhaust gas, the valve seven 223 is opened, the two-position three-way valve 240 controls the branch pipe six 206 to communicate with the FID detector 400, so that the second collection bag 320 communicates with the FID detector 400, and the collected gas in the second collection bag 320 enters the FID detector 400 for detection. The above process is a carbon canister emission detection process.
Before the gas in the first collecting air bag 310 is introduced into the FID detector 400, an air bag inflation process is required, referring to fig. 3, since the gas concentration detected in the FID detector 400 is gas concentration, the second valve 212, the fourth valve 214, the sixth valve 222, and the eighth valve 224 are opened, the compressed air delivery pipe 240 is communicated with the first collecting air bag 310, the compressed air delivery pipe 250 delivers the compressed air into the first collecting air bag 310, the first collecting air bag 310 is inflated until the air pressure in the first collecting air bag 310 reaches a set value, and the valves are closed, so that the first collecting air bag 310 is inflated to a proper size at this time. Similarly, before the gas in the second collection air bag 320 is introduced into the FID tester 400, an air bag inflation process is required, the valve three 213, the valve four 214, the valve seven 223, and the valve eight 224 are opened, the compressed air delivery pipe 240 is communicated with the second collection air bag 320, the compressed air delivery pipe 250 delivers the compressed air into the second collection air bag 320, the second collection air bag 320 is inflated until the air pressure in the second collection air bag 320 reaches a set value, and the valve is closed, so that the second collection air bag 320 is inflated to a proper size.
After the FID detector 400 detects the concentration of the emissions, the emission is calculated by multiplying the volume of the collection bag 300 by the emission.
After the detection of 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 gas in the first collection air bag 310 to the outside of the constant pressure sealed chamber 100, then the valve two 212 and the valve four 214 or the valve six 222 and the valve eight 224 are opened, the compressed air is pumped into the first collection air bag 310 to inflate the air bag, and after inflation, the gas in the first collection air bag 310 is pumped out by 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. The gas in the second collection bag 320 is cleaned in this way.
During cooling, the gas reflux process:
referring to fig. 3, the two-position three-way valve i 230 connects the constant pressure sealed chamber 100 with the canister port, and since the temperature reduction process and the gas in the canister contract, the gas for backflow flows back from the constant pressure sealed chamber 100 to the canister in order to protect the constant pressure process in the canister and prevent the exhaust gas collected by the collecting gas bag 300 from flowing back into the canister.
And (3) a permeation emission detection process:
referring to fig. 3, when the two-position three-way valve blocks the communication between the branch pipe six 206 and the FID detector 400, and the FID detector 400 is communicated with the constant-pressure closed chamber 100, the FID detector 400 detects air in the constant-pressure closed chamber 100, and since fuel vapor permeating in the fuel system flows into the constant-pressure closed chamber 100, the FID detector 400 detects the fuel system permeate. The above process is a fuel system permeation emission test process.
Pipeline cleaning process:
referring to fig. 6, the first valve 211 and the fourth valve 214 are opened, and the compressed gas enters the upper pipe 210 through the compressed gas delivery pipe 250, cleans the residual gas in the upper pipe 210, and then flows out of the atmospheric pipe 700, completing the cleaning process of the upper pipe 210; referring to fig. 7, the valve five 221 and the valve eight 224 are opened, and the compressed gas enters the lower pipe 220 through the compressed gas delivery pipe 250, cleans the residual gas in the lower pipe 220, and then flows out of the atmosphere pipe 700, completing the cleaning process of the lower pipe 220.
The upper pipe 210 is an air bag collecting pipe, the lower pipe 220 is an air bag detecting pipe, and the first valve 211 to the ninth valve 225 are all single-way solenoid valves.
Above testing process detects conveniently, and whole device changes through simulation environment and collects carbon tank exhaust gas and fuel oil system infiltration exhaust gas to carry out simultaneous detection process to exhaust gas, carbon tank and fuel oil system detect under same temperature and atmospheric pressure condition, and it is high to improve the detection precision, reduces the test influence to fuel oil system and carbon tank that causes by the environment, and it is very convenient to test.
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 those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A fuel system sensing device, comprising:
the constant-pressure closed chamber (100) is used for placing a fuel system;
a heat exchanger (500) disposed on the constant-pressure sealed chamber (100);
the plurality of collecting air bags (300) are arranged inside the constant-pressure closed chamber (100), and the carbon tanks are respectively communicated with each collecting air bag (300) and the inside of the constant-pressure closed chamber (100);
an FID detector (400), wherein the FID detector (400) is communicated with each collecting air bag (300) and the constant-pressure closed chamber (100) respectively;
constant pressure sealed chamber (100), collect air pocket (300) the carbon tank with all be provided with the on-off valve on communicating pipeline of FID detector (400).
2. The fuel system detection device as claimed in claim 1, further comprising an atmospheric pipe (700) and a compressed gas delivery pipe (250), wherein the FID detector (400) is respectively communicated with each of the collection air bags (300) through an air bag detection pipe, and the atmospheric pipe (700), the air bag detection pipe and the compressed gas delivery pipe (250) are sequentially communicated.
3. The fuel system detection device as recited in claim 2, wherein a vacuum pump (280) is further connected to the air bag detection pipe/compressed air delivery pipe, a valve nine (225) is provided between the vacuum pump (280) and the air bag detection pipe/compressed air delivery pipe, and an outside of the vacuum pump (280) is connected to the atmosphere.
4. A fuel system sensing device as claimed in claim 2, characterised in that an inlet pipe (208) and a flow meter (252) are connected to the compressed gas delivery pipe (250).
5. A fuel system testing device as claimed in claim 2, wherein said canister is connected to each of said collection air bags (300) by a bag collector tube, said atmospheric tube (700), said bag collector tube and said compressed gas supply tube (250) being connected in series.
6. The fuel system detection device according to any one of claims 1 to 5, wherein the constant pressure closed chamber (100) comprises a box body (110) and a movable constant pressure plate (120), the movable constant pressure plate (120) is arranged on the top of the box body (110) and can move up and down, the box body (110) and the movable constant pressure plate (120) form a closed chamber with variable volume, and a pressure sensor is arranged in the closed chamber.
7. The fuel system detection device as recited in claim 6, wherein a closed cavity capacity tester (130) is disposed outside the constant pressure closed chamber (100), and the closed cavity capacity tester (130) comprises a measurement gauge (131) fixedly connected to the movable constant pressure plate (120) and a zero position sheet (132) disposed on an outer sidewall of the tank (110) and covering the measurement gauge (131).
8. A detection method of a fuel system detection device is characterized by comprising a fuel system permeation emission detection process and a carbon tank emission detection process,
the fuel system carburized emission detection process comprises the following detection steps:
the fuel system is placed in the constant-pressure closed chamber (100), the FID detector (400) is communicated with the inside of the constant-pressure closed chamber (100), and gas collected in the constant-pressure closed chamber (100) is introduced into the FID detector (400) for detection;
the carbon tank emission detection process comprises the following detection steps:
a) the heat exchanger (500) controls the temperature inside the constant-pressure closed chamber (100) to be reduced or increased;
b) when the temperature is reduced, the carbon tank opening is communicated with a collecting air bag (300), the collecting air bag (300) collects gas discharged from the carbon tank opening, when the temperature is increased, the carbon tank opening is communicated with the inside of the constant-pressure sealed chamber (100), and the gas in the constant-pressure sealed chamber (100) flows back to the carbon tank;
c) after the gas discharged from the carbon tank opening is collected by the collecting air bag (300), the collecting air bag is communicated with the FID detector (400) and the gas is introduced into the FID detector (400) for detection.
9. The method as set forth in claim 8, wherein the canister purge detection process further comprises the following air bag inflation step: the compressed air delivery pipe (250) delivers the compressed air to the collection air bag (300) until the air pressure in the collection air bag (300) reaches a set value.
10. The method as claimed in claim 9, further comprising the following air bag cleaning process: after the FID detector (400) detects the gas in the collecting air bag (300), the vacuum pump (280) pumps the gas in the collecting air bag (300), compressed air is introduced into the collecting air bag (300) again through the compressed air conveying pipe (250), and the gas is continuously pumped through the vacuum pump (280) after being expanded and is repeatedly pumped for many times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911299755.5A CN111060361A (en) | 2019-12-17 | 2019-12-17 | Fuel system detection device and detection method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538202A (en) * | 2024-01-10 | 2024-02-09 | 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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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538202A (en) * | 2024-01-10 | 2024-02-09 | 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 |
| 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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