CN115045779A - Experimental method and system for detecting hydrocarbon evaporation emission in refueling process - Google Patents
Experimental method and system for detecting hydrocarbon evaporation emission in refueling process Download PDFInfo
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- CN115045779A CN115045779A CN202210831815.9A CN202210831815A CN115045779A CN 115045779 A CN115045779 A CN 115045779A CN 202210831815 A CN202210831815 A CN 202210831815A CN 115045779 A CN115045779 A CN 115045779A
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- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 83
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 83
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 83
- 238000002474 experimental method Methods 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 title claims abstract description 29
- 230000008020 evaporation Effects 0.000 title claims abstract description 19
- 238000001704 evaporation Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 78
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 70
- 238000012544 monitoring process Methods 0.000 claims abstract description 14
- 239000003921 oil Substances 0.000 claims description 118
- 239000000446 fuel Substances 0.000 claims description 26
- 238000003795 desorption Methods 0.000 claims description 17
- 238000005429 filling process Methods 0.000 claims description 11
- 230000007613 environmental effect Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- 239000003502 gasoline Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000000295 fuel oil Substances 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 description 12
- 231100000719 pollutant Toxicity 0.000 description 12
- 238000012806 monitoring device Methods 0.000 description 8
- 239000002828 fuel tank Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000001273 butane Substances 0.000 description 4
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 4
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013028 emission testing Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0809—Judging failure of purge control system
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- Sampling And Sample Adjustment (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention relates to the technical field of automobiles, and particularly discloses an experimental method for detecting hydrocarbon evaporation emission in an oiling process, wherein the specific scheme comprises the steps of constructing a standard part bench experimental scene containing a carbon tank; simulating a hydrocarbon evaporation and emission process in the whole vehicle refueling process by using a standardized part bench experimental scene, monitoring the pressure value of the port part of a refueling pipe assembly in the experimental scene by using pressure signal monitoring equipment in the standardized part bench experimental scene, calculating the refueling emission obtained by the standardized part bench experimental test, and evaluating the whole vehicle experimental result by using the calculated result; according to the invention, the whole vehicle experiment is replaced by the standard part bench experiment, the hydrocarbon emission discharged to the atmosphere in the refueling process is simulated and tested, and the evaporative emission result of the VII-type whole vehicle experiment is obtained, so that the experiment period is shortened, the cost is saved, and the flexibility is high.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an experimental method for detecting hydrocarbon evaporation emission in an oiling process and a system adopting the method.
Background
Current gasoline car fuel evaporative pollutants are mainly derived from operational emissions, diurnal emissions, hot dip emissions and fueling emissions. The pollution produced by refueling emission in a short time is far greater than that produced by other evaporative emissions. A VII type test (namely an oiling pollutant emission test) is specially and newly added in the national VI emission standard to control oiling pollutant emission, and the oiling emission of a single vehicle is regulated to be lower than 0.05g/L, the existing national V fuel system is difficult to meet the requirements, and repeated tests and design are required to be carried out on a carbon tank of the new vehicle to meet the requirements of the national VI emission standard.
At present, in a host factory, in a new vehicle type research and development stage, the test period for carrying out a national six VII type test (a fuel filling process pollutant emission test in GB183526-2016) of the whole vehicle is about 3-4 days, the efficiency is low, and the cost is high.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides an experimental method for detecting hydrocarbon evaporative emission in the refueling process, the hydrocarbon emission collected in the pollutant emission experiment in the refueling process of an automobile is basically escape from an air port of a source carbon tank and escape from an opening part of a refueling pipe, and because the refueling process is short (about 2min), the background emission change of the whole automobile can be ignored, a part bench experiment can be adopted to replace the whole automobile experiment.
The experimental method for detecting evaporative emissions of hydrocarbon during refueling according to the embodiment of the first aspect of the invention comprises the following steps:
s1, building a standard part bench experiment scene containing a carbon tank;
s2, simulating a hydrocarbon evaporation and emission process in the refueling process of the whole vehicle by using a standardized part bench experimental scene, monitoring the pressure value of an end opening part of a refueling pipe assembly in the experimental scene by using pressure signal monitoring equipment in the standardized part bench experimental scene, calculating the refueling and emission amount obtained by the standardized part bench experimental test, and evaluating the whole vehicle experimental result by using the calculated result;
s3, judging a hydrocarbon evaporation discharge port according to the positive and negative pressure values, and determining a discharge port of the hydrocarbon discharge value in the refueling process;
and S4, completing a hydrocarbon evaporation emission detection experiment in the refueling process.
According to the experimental method provided by the embodiment of the invention, the whole vehicle experiment is replaced by the standard part bench experiment, the hydrocarbon emission discharged to the atmosphere in the fuel system refueling process is tested in a simulated mode, the evaporative emission result of the whole vehicle VII type experiment (GB183526-2016) is obtained, the experimental period can be shortened to 1 day, the cost is saved, and the flexibility is high.
According to some embodiments of the invention, the step S1 includes preparation of a test material and preparation of a test apparatus, wherein:
the experimental materials comprise an oil filling pipe assembly, an oil tank, a carbon tank, a plug, a steam pipeline, an oil pump short-circuit pipeline and an oil pump;
the experimental equipment comprises a power supply, a lead, refueling equipment, pressure signal monitoring equipment and a pressure sensor;
be connected to the oil tank with filling oil pipe assembly, the oil tank is connected to the absorption mouth constitution steam line of carbon tank, and the end cap is used for plugging up carbon tank absorption mouth, and the oil pump is installed on the oil tank, the oil-out and the oil return opening of oil pump pass through oil pump short circuit tube coupling, and the oil pump passes through the wire electricity with the power and is connected, pressure sensor fixed mounting is in filling oil pipe assembly port portion, pressure sensor is connected with pressure signal monitoring equipment electricity, and it is experimental to replace whole car with standardized part rack experiment, can judge the discharge port of confirming this experiment hydrocarbon emission value through monitoring oil inlet pipe pressure simultaneously.
According to some embodiments of the invention, the step S2 includes the following:
s21, disconnecting a steam pipeline for connecting the carbon tank and the oil tank in the standard part bench experimental scene, emptying oil and filling oil to 40 percent of the volume X (unit: L) of the oil tank under the conditions that the ambient temperature is 23 +/-5 ℃ and the oil temperature is 18 +/-8 ℃,
s22, adsorbing the pretreatment carbon tank to a critical point;
step S23, connecting the steam pipeline in the step S21, starting an oil pump in a standardized part rack experimental scene to electrify under the condition that the environmental temperature is 23 +/-5 ℃, and powering off the oil pump after the oil pump is electrified and runs for A minutes, wherein: removing the plug before the energization, desorbing the carbon tank while energizing the oil pump, finishing the driving test of the whole vehicle according to a standardized experiment to obtain the desorption amount a of the carbon tank, and plugging the desorption opening of the carbon tank by the plug again;
s24, standing the whole vehicle for 6-36 hours at the ambient temperature of 23 +/-3 ℃;
step S25, powering off the oil pump after the oil pump is powered on and runs for B minutes under the condition that the environmental temperature is 23 +/-5 ℃, wherein: removing the plug before the energization, desorbing the carbon tank while energizing the oil pump, processing a running test by the whole vehicle according to a standardized experiment and an oiling control system, ending after the sum of desorption amounts of the carbon tank is b, and plugging the desorption opening of the carbon tank again by the plug;
s26, disconnecting a steam pipeline connecting the carbon tank and the oil tank;
s27, under the condition that the environmental temperature is 23 +/-5 ℃, the oil pump is electrified to discharge oil in the empty oil tank, and external oiling equipment is adopted to refuel the empty oil tank until the oil tank reaches 10 +/-0.5L of the volume X (unit: L) of the oil tank, and then the refueling is stopped;
s28, standing the whole vehicle for 6-36 hours at the ambient temperature of 23 +/-3 ℃;
s29, connecting a steam pipeline for connecting the carbon tank with the oil tank;
s210, pushing the whole vehicle standardized part rack into a closed chamber, and recording the original hydrocarbon concentration in the closed chamber as c;
s211, performing an oiling discharge test in a closed chamber;
and S212, calculating the refueling emission of the refueling emission test, evaluating the whole vehicle experiment result according to the calculated result, and simulating the hydrocarbon emission discharged into the atmosphere in the refueling process of the fuel system by replacing the whole vehicle experiment with a standard part bench experiment.
According to some embodiments of the invention, the adsorption of the pretreatment canister to the critical point in the step S22 is specifically to adsorb 50% butane/50% nitrogen to the critical point of 2g at a butane 40g/h rate, so as to meet the experimental requirements.
According to some embodiments of the present invention, a value of a in step S23 is 30min to 40min, preferably 35 min; and in the step S25, the value of B is 75-85 min, preferably 80 min, which is beneficial to simulating that the whole vehicle reaches the general level of a desorption carbon tank.
According to some embodiments of the present invention, in step S3, the hydrocarbon evaporation discharge port is determined according to the positive and negative pressure values, if the tested hydrocarbon discharge value is abnormal, the pressure value can be used to confirm whether the oil filling port has oil vapor discharged, so as to narrow the problem troubleshooting range, where the determination criteria are: if the pressure value is a positive value, the hydrocarbon emission value is discharged from the carbon tank through the atmosphere port and the oil filling port in the oil filling process, and if the pressure value is a negative value, the hydrocarbon emission value is discharged from the carbon tank through the atmosphere port in the oil filling process.
According to some embodiments of the present invention, the step S211 of performing the refueling emission test in the closed chamber comprises adding at least 85% ± 0.5L of gasoline with a tank volume X (unit: L) into the fuel tank through the refueling pipe assembly at a speed of 37 ± 1L/min at an ambient temperature of 23 ℃ ± 3 ℃ and a fuel temperature of 20 ℃ ± 1 ℃ to meet the standardized refueling emission test requirement.
According to some embodiments of the present invention, the calculating of the refueling emission amount in the refueling emission test in step S212 includes recording the tested hydrocarbon concentration in the closed chamber as d within 60S ± 5S after the end of step S211, and calculating the amount of the hydrocarbon discharged into the closed chamber by the refueling test using the software provided in the closed chamber in combination with the value c of the original hydrocarbon concentration in the closed chamber as e g, and obtaining the hydrocarbon emission result of f mg/L according to the formula f 1000 × e/X.
According to the embodiment of the second aspect of the invention, an experimental system for detecting hydrocarbon evaporative emission in the refueling process is provided, and the method is adopted to detect the hydrocarbon evaporative emission experiment in the refueling process.
According to some embodiments of the invention, the system is applied to a fuel vehicle refueling simulation test.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of an experimental method for detecting evaporative emissions of hydrocarbon during refueling in accordance with an embodiment of the present invention;
FIG. 2 is a flowchart of a method according to step S2 of the embodiment of the invention in FIG. 1;
fig. 3 is a schematic diagram of component connection of step S1 according to an embodiment of the present invention;
reference numerals:
100. an oil fill tube assembly; 200. an oil tank; 300. a carbon tank; 400. an oil pump; 500. a power source; 600. a pressure signal monitoring device; 700. a pressure sensor;
310. a plug; 320. a steam line;
410. the oil pump is connected with a pipeline in a short way;
510. and (4) conducting wires.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, and it is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
Referring to fig. 1 and 2, an experimental method for detecting evaporative emissions of hydrocarbon during refueling includes the following steps:
s1, building a standardized part rack experiment scene containing a carbon tank, and using the scene to simulate a hydrocarbon evaporation emission experiment in the whole vehicle refueling process;
s2, simulating a hydrocarbon evaporation and emission process in the refueling process of the whole vehicle by using a standardized part bench experimental scene, monitoring the pressure value of an end opening part of a refueling pipe assembly in the experimental scene by using pressure signal monitoring equipment in the standardized part bench experimental scene, calculating the refueling and emission amount obtained by the standardized part bench experimental test, and evaluating the whole vehicle experimental result by using the calculated result; wherein step S2 includes the following steps:
s21, disconnecting a steam pipeline for connecting the carbon tank and the oil tank in the standard part bench experimental scene, emptying oil and filling oil to 40 percent of the volume X (unit: L) of the oil tank under the conditions that the ambient temperature is 23 +/-5 ℃ and the oil temperature is 18 +/-8 ℃,
s22, adsorbing the pretreatment carbon tank to a critical point, wherein specifically, 50% butane/50% nitrogen is adsorbed to a critical point of 2g at a butane rate of 40g/h, and the whole carbon tank is simulated to reach a harsher state;
step S23, connecting the steam pipeline in the step S21, starting an oil pump in a standardized part rack experimental scene to electrify under the condition that the environmental temperature is 23 +/-5 ℃, and powering off the oil pump after the oil pump is electrified and runs for 35 minutes, wherein: removing the plug before electrifying, carrying out desorption on the carbon tank while electrifying the oil pump, carrying out a running test according to a standard experiment on the whole vehicle (specifically, carrying out an experiment on the whole vehicle according to appendix I in GB183526-2016, carrying out a pretreatment running test in step I), finishing after the desorption amount of the carbon tank is a, and blocking a desorption opening of the carbon tank by the plug again;
s24, standing the whole vehicle for 6-36 hours at the ambient temperature of 23 +/-3 ℃;
step S25, powering off the oil pump after the oil pump is powered on and runs for 80 minutes under the condition that the environmental temperature is 23 +/-5 ℃, wherein: removing the plug before electrifying, carrying out desorption on the carbon tank while electrifying the oil pump, carrying out a driving test according to a standardized test and an oiling control system (specifically, carrying out an experiment according to appendix I in GB183526-2016 on the whole vehicle, and carrying out a driving test according to step I type experiment driving and oiling control system processing) on the whole vehicle, ending after the total desorption amount of the carbon tank is b, blocking a carbon tank desorption port by the plug again, and simulating the general level of the whole vehicle for desorbing the carbon tank;
s26, disconnecting a steam pipeline connecting the carbon tank and the oil tank;
s27, under the condition that the environmental temperature is 23 +/-5 ℃, the oil pump is electrified to discharge oil in the empty oil tank, and external oiling equipment is adopted to refuel the empty oil tank until the oil tank reaches 10 +/-0.5L of the volume X (unit: L) of the oil tank, and then the refueling is stopped;
s28, standing the whole vehicle for 6-36 hours at the ambient temperature of 23 +/-3 ℃ to simulate the low oil level state of the vehicle owner before the vehicle enters a gas station for refueling;
s29, connecting a steam pipeline for connecting the carbon tank with the oil tank;
s210, pushing the whole vehicle standardized part rack into a closed chamber, and recording the original hydrocarbon concentration in the closed chamber as c;
and S211, performing an oiling discharge test in a closed chamber, and simulating low-oil-level oiling of the whole vehicle. The load of the carbon tank is large at the moment, and the load of the carbon tank can cover more than 10% of the load of the carbon tank when oil is added;
s212, calculating the refueling emission of the refueling emission test, and evaluating the whole vehicle experiment result according to the calculated result;
s3, judging a hydrocarbon evaporation discharge port according to the positive and negative pressure values, and determining a discharge port of the hydrocarbon discharge value in the refueling process;
and S4, completing a hydrocarbon evaporation emission detection experiment in the refueling process.
In this embodiment, it should be noted that the refueling equipment is used for refueling in the above-mentioned refueling, the RVP value of the fuel is controlled between 56 and 60 and is as close to the 60RVP value as possible, and the fuel is required to meet the specification of appendix K in GB183526-2016, and the results of the oil experiment lower than the 60RVP value can be covered by the oil experiment.
In the present embodiment, specifically, step S1 includes preparation of an experimental material and preparation of an experimental device, in which:
the experimental materials comprise an oil filling pipe assembly 100, an oil tank 200, a carbon tank 300, a plug 310, a steam pipeline 320, an oil pump short-circuit pipeline 410 and an oil pump 400;
the experimental equipment comprises a power supply 500, a conducting wire 510, pressure signal monitoring equipment 600, a pressure sensor 700, a closed chamber (hydrocarbon evaporation emission testing equipment which can realize FID hydrocarbon analysis) and carbon tank loading and desorption equipment;
the fuel filling pipe assembly 100 is connected to the fuel tank 200, the fuel tank 200 is connected to the adsorption port of the carbon canister 300 to form a steam pipeline 320, the plug 30 is used for plugging the adsorption port of the carbon canister 300, the fuel pump 400 is installed on the fuel tank 200, the fuel outlet and the fuel return port of the fuel pump 400 are connected through a fuel pump short circuit pipeline 410, the fuel pump 400 is electrically connected with the power supply 500 through a lead 510, the pressure sensor 700 is fixedly installed at the port part of the fuel filling pipe assembly 100, and the pressure sensor 700 is electrically connected with the pressure signal monitoring device 510.
In this embodiment, specifically, the step S211 of performing the refueling emission test in the closed chamber includes adding at least 85% ± 0.5L of gasoline with a rated tank volume X (unit: L) into the fuel tank through the fuel filler pipe assembly at a speed of 37 ± 1L/min while controlling the fuel temperature at 23 ℃ ± 3 ℃ and the fuel temperature at 20 ℃ ± 1 ℃.
In this embodiment, specifically, the step 212 of calculating the refueling emission amount of the refueling emission test includes recording the tested hydrocarbon concentration in the closed chamber as d within 60S ± 5S after the step S211 is finished, and calculating the amount of the hydrocarbon discharged into the closed chamber by the refueling experiment as e g by using the software carried by the closed chamber in combination with the value c of the original hydrocarbon concentration in the closed chamber, so as to obtain the hydrocarbon emission result of f mg/L according to the formula f 1000 × e/X.
Example 1
Taking an N35X vehicle model as an example, preparing vehicle model parts, constructing a standard part bench test scene containing a carbon tank according to step S1, testing according to step S2, wherein a is 161L, b is 322L, the standing time of step S24 is 6h, the standing time of step S28 is 6h, the fuel oil amount added in step S211 is 57L, the mass e of hydrocarbon discharged into a closed type is 0.741 g, a hydrocarbon emission result f is calculated to be 1000 x 0.741/57 mg/L, the hydrocarbon emission result of the vehicle model in the VII type test is 14mg/L, the bench test is basically consistent with the whole vehicle test result, namely the whole vehicle test result can be evaluated, the pressure value in step S3 is measured to be-5.85 by using the pressure signal monitoring device 600, so that the hydrocarbon emission is discharged from the carbon tank through an atmosphere port, and the test time is 1 day, and the cost is 30% of the six VII type experiment (oil filling process pollutant emission experiment, GB183526-2016) of the entire vehicle grade country.
Example 2
Taking an N35X vehicle model as an example, preparing vehicle model parts, constructing a standard part bench test scene containing a carbon tank according to step S1, testing according to step S2, wherein a is 161L, b is 322L, the standing time of step S24 is 36h, the standing time of step S28 is 36h, the fuel quantity added in step S211 is 57.5L, the mass e of hydrocarbon discharged into a closed type is 0.747 g, calculating to obtain a hydrocarbon discharge result f which is 1000 x 0.747/57.5 which is 13mg/L, the vehicle model obtains a whole vehicle test result of 14mg/L through a VII-type test, the bench test is basically consistent with the whole vehicle test result, namely the whole vehicle test result can be evaluated, and the pressure value of step S3 measured by a pressure signal monitoring device 600 is-5.85 mbar, so that the hydrocarbon discharge is judged to be discharged from an atmosphere opening of the carbon tank, and the test time is 1 day, and the cost is 30% of the six VII type experiment (oil filling process pollutant emission experiment, GB183526-2016) of the entire vehicle grade country.
Example 3
Taking an N35X vehicle model as an example, preparing vehicle model parts, constructing a standard part bench test scene containing a carbon canister according to step S1, testing according to step S2, wherein a is 161L, b is 322L, the standing time of step S24 is 22h, the standing time of step S28 is 22h, the fuel amount added in step S211 is 58L, the mass e of hydrocarbon discharged into a closed type is 0.756 g, calculating to obtain a hydrocarbon emission result f which is 1000 x 0.756/58 which is 13mg/L, obtaining an entire vehicle test result of 14mg/L through a vii type test, and obtaining that bench test is basically consistent with the entire vehicle test result, namely the entire vehicle test result can be evaluated, and the pressure value of step S3 measured by the pressure signal monitoring device 600 is-5.85 mbar, so that the hydrocarbon emission is discharged from an atmosphere vent of the carbon canister, and the time of the experiment is 1 day, and the cost is 30% of the six VII type experiment (oil filling process pollutant emission experiment, GB183526-2016) of the entire vehicle grade country.
Example 4
Taking a CX7XX vehicle model as an example, preparing vehicle model parts, constructing a standard part bench test scene containing a carbon tank according to step S1, testing according to step S2, wherein a is 310L, b is 603L, the standing time of step S24 is 6h, the standing time of step S28 is 6h, the fuel quantity added in step S211 is 55L, the mass e of hydrocarbon discharged into a closed type is 1.193 g, calculating to obtain a hydrocarbon emission result f which is 1000 mbar 1.193/55 mbar 21.7mg/L, obtaining an experiment result of the whole vehicle through a VII type test, the bench test is basically consistent with the experiment result of the whole vehicle, namely the experiment result of the whole vehicle can be evaluated, measuring the pressure value of step S3 to be-3.72 by using the pressure signal monitoring device 600, and therefore judging that the hydrocarbon emission is discharged from a carbon tank through an atmosphere vent, the time of the experiment is 1 day, and the cost is 30% of the six VII type experiment (oil filling process pollutant emission experiment, GB183526-2016) of the entire vehicle grade country.
Example 5
Taking a CX7XX vehicle model as an example, preparing vehicle model parts, constructing a standard part bench test scene containing a carbon tank according to step S1, testing according to step S2, wherein a is 310L, b is 603L, the standing time of step S24 is 36h, the standing time of step S28 is 36h, the fuel amount added in step S211 is 56L, the mass e of hydrocarbon discharged into a closed type is 1.2 g, calculating to obtain a hydrocarbon emission result f which is 1000 mbar 1.2/56 mbar 21.4mg/L, obtaining an entire vehicle test result of 20.3mg/L through a VII-type test of the vehicle model, the bench test is basically consistent with the entire vehicle test result, namely the entire vehicle test result can be evaluated, measuring the pressure value of step S3 to be-3.72 by using the pressure signal monitoring device 600, thus judging that the hydrocarbon emission is discharged from a carbon tank vent, the experiment time is 1 day, and the cost is 30% of the six VII type experiment (oil filling process pollutant emission experiment, GB183526-2016) of the entire vehicle grade country.
Example 6
Taking a CX7XX vehicle model as an example, preparing vehicle model parts, constructing a standard part bench test scene containing a carbon tank according to step S1, testing according to step S2, wherein a is 310L, b is 603L, the standing time of step S24 is 22h, the standing time of step S28 is 22h, the fuel amount added in step S211 is 56.6L, the mass e of hydrocarbon discharged into a closed type is 1.21 g, calculating to obtain a hydrocarbon emission result f which is 1000, 1.21/56.6 and 21.4mg/L, the vehicle model obtains a whole vehicle test result of 20.3mg/L through a VII-type test, the bench test is basically consistent with the whole vehicle test result, namely the test result of the whole vehicle embodiment can evaluate the test result, and the pressure value of step S3 is-3.72 mbar by using the pressure signal monitoring device 600, so that the hydrocarbon emission is discharged from an atmosphere opening of the carbon tank at this time, and the test time is 1 day, and the cost is 30% of the six VII type experiment (oil filling process pollutant emission experiment, GB183526-2016) of the entire vehicle grade country.
The invention further provides a system for reducing pollutant emission in refueling of the whole vehicle, which adopts the method to detect the hydrocarbon evaporative emission experiment in the refueling process.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered as limiting the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An experimental method for detecting hydrocarbon evaporation emission in an oiling process is characterized by comprising the following steps:
s1, building a standard part bench experiment scene containing a carbon tank;
s2, simulating a hydrocarbon evaporation and emission process in the refueling process of the whole vehicle by using a standardized part bench experimental scene, monitoring the pressure value of an end opening part of a refueling pipe assembly in the experimental scene by using pressure signal monitoring equipment in the standardized part bench experimental scene, calculating the refueling and emission amount obtained by the standardized part bench experimental test, and evaluating the whole vehicle experimental result by using the calculated result;
s3, judging a hydrocarbon evaporation discharge port according to the positive and negative pressure values, and determining a discharge port of the hydrocarbon discharge value in the refueling process;
and S4, completing a hydrocarbon evaporation emission detection experiment in the refueling process.
2. The experimental method for detecting evaporative emissions of hydrocarbon during refueling as recited in claim 1, wherein said step S1 comprises preparation of experimental materials and preparation of experimental equipment, wherein:
the experimental materials comprise an oil filling pipe assembly, an oil tank, a carbon tank, a plug, a steam pipeline, an oil pump short-circuit pipeline and an oil pump;
the experimental equipment comprises a power supply, a lead, pressure signal monitoring equipment and a pressure sensor;
the carbon tank adsorption device is characterized in that an oil filling pipe assembly is connected to an oil tank, the oil tank is connected to an adsorption port of a carbon tank to form a steam pipeline, a plug is used for plugging the adsorption port of the carbon tank, an oil pump is installed on the oil tank, an oil outlet and an oil return port of the oil pump are connected through an oil pump short circuit pipeline, the oil pump is electrically connected with a power supply through a lead, a pressure sensor is fixedly installed at the port part of the oil filling pipe assembly, and the pressure sensor is electrically connected with pressure signal monitoring equipment.
3. An experimental method for detecting evaporative emissions of hydrocarbon during refueling as recited in claim 1, comprising: the step S2 includes the following steps:
s21, disconnecting a steam pipeline for connecting the carbon tank and the oil tank in the standard part bench experimental scene, emptying oil and filling oil to 40% of the volume X of the oil tank under the conditions that the ambient temperature is 23 +/-5 ℃ and the oil temperature is 18 +/-8 ℃,
s22, adsorbing the pretreatment carbon tank to a critical point;
step S23, connecting the steam pipeline in the step S21, starting an oil pump in a standardized part rack experimental scene to electrify under the condition that the environmental temperature is 23 +/-5 ℃, and powering off the oil pump after the oil pump is electrified and runs for A minutes, wherein: removing the plug before the energization, desorbing the carbon tank while energizing the oil pump, finishing the driving test of the whole vehicle according to a standardized experiment to obtain the desorption amount a of the carbon tank, and plugging the desorption opening of the carbon tank by the plug again; s24, standing the whole vehicle for 6-36 hours at the ambient temperature of 23 +/-3 ℃;
step S25, powering off the oil pump after the oil pump is powered on and runs for B minutes under the condition that the environmental temperature is 23 +/-5 ℃, wherein: removing the plug before the energization, performing the desorption of the carbon tank while energizing the oil pump, processing the running test of the whole vehicle according to a standardized experiment and an oiling control system, ending after the sum of the desorption amount of the carbon tank is b, and plugging the desorption opening of the carbon tank by the plug again;
s26, disconnecting a steam pipeline connecting the carbon tank and the oil tank;
s27, under the condition that the environmental temperature is 23 +/-5 ℃, the oil pump is electrified to discharge oil in the empty oil tank, and external oiling equipment is adopted to refuel the empty oil tank until the volume of the oil tank reaches 10 +/-0.5L, and then the refueling is stopped;
s28, standing the whole vehicle for 6-36 hours at the ambient temperature of 23 +/-3 ℃;
s29, connecting a steam pipeline for connecting the carbon tank with the oil tank;
s210, pushing the whole vehicle standardized part rack into a closed chamber, and recording the original hydrocarbon concentration in the closed chamber as c;
s211, performing an oiling discharge test in a closed chamber;
and S212, calculating the refueling emission of the refueling emission test, and evaluating the whole vehicle experiment result according to the calculated result.
4. An experimental method for detecting evaporative emissions of hydrocarbon during refueling as recited in claim 3, comprising: in the step S23, the value of A is 30 min-40 min.
5. An experimental method for detecting evaporative emissions of hydrocarbon during refueling as recited in claim 3, comprising: and the value of B in the step S25 is 75-85 min.
6. An experimental method for detecting evaporative emissions of hydrocarbon during refueling as recited in claim 3, comprising: and the step S211 of refueling emission test in the closed chamber comprises the steps of controlling the temperature of fuel oil to be 20 +/-1 ℃ at the ambient temperature of 23 +/-3 ℃, and adding at least 85 +/-0.5L of gasoline with the volume X of the oil tank into the oil tank through the refueling pipe assembly at the speed of 37 +/-1L/min.
7. An experimental method for detecting evaporative emissions of hydrocarbon during refueling as recited in claim 3, comprising: the step S212 of calculating the refueling emission amount of the refueling emission test includes recording the tested hydrocarbon concentration in the closed chamber as d within 60S ± 5S after the step S211 is finished, calculating the mass of the hydrocarbon discharged into the closed chamber in the refueling experiment as e g by using software carried in the closed chamber according to the value c of the original hydrocarbon concentration in the closed chamber, and obtaining the hydrocarbon emission result f mg/L according to the formula f 1000 × e/X.
8. The experimental method for detecting evaporative emissions of hydrocarbon during refueling as recited in claim 1, comprising: in the step S3, the judgment standard for judging the hydrocarbon evaporation discharge port according to the positive and negative pressure values is as follows: if the pressure value is a positive value, the hydrocarbon emission value is discharged from the carbon tank through the atmosphere port and the oil filling port in the oil filling process, and if the pressure value is a negative value, the hydrocarbon emission value is discharged from the carbon tank through the atmosphere port in the oil filling process.
9. An experimental system for detecting hydrocarbon evaporative emissions during refueling, which is used for detecting the hydrocarbon evaporative emissions during refueling by adopting the method as claimed in any one of claims 1 to 8.
10. The experimental system of claim 9, applied to a fuel vehicle refueling simulation experiment.
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