Evaporative emission simulation test matching device and test method for rubber pipe part in oil filling pipe

Abstract

The invention discloses an evaporative emission simulation test matching device and a test method for a rubber pipe part in an oil filling pipe. The evaporative emission simulation test matching device comprises an oil storage tank, a rubber pipe plug and a tested rubber pipe, the outer side wall of the oil storage tank comprises an oil storage tank filling surface and an oil storage tank testing surface which are adjacent; one end of the oil storage tank filling surface is connected with one end of the oil storage tank testing surface; an included angle with a preset size is formed between the oil storage tank filling surface and the oil storage tank testing surface; an oil storage tank filling port is formed in the outer side wall, adjacent to the other end of the oil storage tank testing surface, of the oil storage tank; the oil storage tank filling port is used for filling fuel oil; the outer side end of the oil storage tank filling port is hermetically connected with one end of the tested rubber tube; and the other end of the tested rubber tube is hermetically provided with a rubber tube plug. According to the invention, the actual working condition of the rubber pipe part connected with the fuel tank in the oil filling pipe of the vehicle can be simulated, so that an evaporative emission simulation test can be carried out on the rubber pipe part, and the evaporative emission condition of the oil filling pipe can be mastered.

Description

Technical Field

[0001] The invention relates to the technical field of automobile environmental protection testing, and in particular to a matching device and a testing method for evaporative emission simulation testing of a rubber hose part in a fuel filler pipe. Background Art

[0002] In order to strengthen the prevention and control of motor vehicle pollution and reduce emissions from the source, the national standard document GB 18352.6-2016 "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)" (referred to as the National VI Standard) has put forward strict requirements on vehicle evaporative emissions. Specific index requirements are put forward for multiple parts such as the fuel filler pipe, fuel tank assembly, fuel tank cap assembly, evaporative line assembly, fuel tank shell, etc. Only when these indicators meet the standards, the entire vehicle meets the standards.

[0003] Evaporative emissions refer to: the hydrocarbons in the fuel stored in the fuel system are released into the atmosphere by penetration and evaporation; as well as background hydrocarbon emissions from other automotive plastic parts, rubber parts, tires, interior parts, paints, chemical coatings, greases, seals and other materials.

[0004] At present, the fuel pipe of a vehicle is an important component that affects the test results of the evaporative emission of the whole vehicle. The fuel pipe of the National VI standard generally adopts a structure combining metal pipes and rubber hoses, that is, it includes a section of rubber hose and a section of metal pipe connected to one end of the section of rubber hose. In addition, the other end of the section of rubber hose is used for the one-way valve of the fuel tank (i.e., the fuel tank ICV valve).

[0005] Among them, metal pipes are zero-emission materials, so the evaporative emissions of the fuel filler pipe are mainly concentrated in the hose part of the fuel filler pipe used to connect to the fuel tank. The hose in the fuel filler pipe used to connect to the fuel tank directly determines whether the fuel filler pipe meets the design requirements.

[0006] However, there is currently no technology that can simulate the actual working conditions of the hose portion of the fuel filler pipe of the vehicle that is used to connect to the fuel tank, so as to facilitate further testing of the vapor emission of the fuel filler pipe.

[0007] Therefore, there is an urgent need to develop a technology that can simulate the actual working conditions of the hose portion of the fuel filler pipe of a vehicle that is connected to the fuel tank, so as to perform an evaporative emission simulation test on the hose portion of the fuel filler pipe that is connected to the fuel tank, and then understand the evaporative emission conditions of the fuel filler pipe, which is conducive to understanding the technical performance of the vehicle. Summary of the invention

[0008] The purpose of the present invention is to provide a device and method for simulating the evaporative emission test of a rubber hose portion in a fuel filler pipe in view of the technical defects in the prior art.

[0009] To this end, the present invention provides an evaporative emission simulation test supporting device for a rubber hose portion in a fuel filler pipe, comprising a fuel storage tank, a rubber hose plug and a rubber hose to be tested;

[0010] The oil storage tank is a hollow box;

[0011] The outer side wall of the oil tank, including the adjacent oil tank filling surface and oil tank test surface;

[0012] One end of the filling surface of the oil storage tank is connected to one end of the testing surface of the oil storage tank;

[0013] There is a preset angle between the filling surface of the oil tank and the testing surface of the oil tank;

[0014] The oil tank is provided with an oil tank filling port on an outer side wall adjacent to the other end of the oil tank test surface;

[0015] The fuel tank filler port is used to inject the fuel for evaporative emission testing;

[0016] The outer end of the oil tank filling port is sealed and connected to one end of the tested hose;

[0017] The other end of the tested hose is sealed with a hose plug.

[0018] In addition, the present invention discloses a test method for evaporative emission simulation test supporting device based on the aforementioned rubber hose part of the fuel filler pipe, characterized in that it comprises the following steps:

[0019] Step S1, placing the fuel tank on the ground with its filling surface touching the ground, and using a fuel dispenser to fill the fuel tank with a preset volume of fuel through the fuel tank filling port;

[0020] Step S2, sealingly connecting one end of the tested hose used for connecting to the oil storage tank to the oil storage tank filling port on the oil storage tank;

[0021] Step S3, sealingly connecting the other end of the tested hose to the hose plug;

[0022] Step S4, rotating the oil storage tank so that the oil storage tank is placed on the ground with the oil storage tank test surface, so that the lower half of the tested hose is immersed in oil and the upper half of the tested hose is air, thereby obtaining an oil storage tank that has been assembled with the tested hose and is ready for testing;

[0023] Step S5, horizontally move the oil storage tank with the tested hose assembled in step S4, which has been prepared for the test, into the evaporation test closed chamber, and continue to keep the oil storage tank placed on the ground with the test surface in the evaporation test closed chamber, and then perform a steam emission test on the tested hose on the oil storage tank placed in the evaporation test closed chamber to obtain the steam emission test result.

[0024] It can be seen from the technical solution provided by the present invention that, compared with the prior art, the present invention provides an evaporative emission simulation test supporting device and test method for the hose part in the fuel filler pipe, which is scientifically designed and can simulate the actual working conditions of the hose part in the fuel filler pipe of the vehicle for connecting to the fuel tank, so as to perform an evaporative emission simulation test on the hose part in the fuel filler pipe for connecting to the fuel tank, and then master the evaporative emission conditions of the fuel filler pipe, which is conducive to mastering the technical performance of the vehicle.

[0025] After inspection, through the application of the present invention, the present invention is an evaporative emission test supporting tooling for the hose part of the fuel filler pipe used to connect with the fuel tank, which is convenient for filling fuel and simulates the actual situation, which is helpful to fill the gap in the evaporative emission test of the fuel filler pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a supporting device for evaporative emission simulation test of a rubber hose portion of a fuel filler pipe provided by the present invention;

[0027] Figure 2 A front view of a fuel tank in a supporting device for evaporative emission simulation testing of a rubber hose portion of a fuel filler pipe provided by the present invention;

[0028] Figure 3 A schematic diagram of the internal state of the oil in the fuel tank after fuel is added before the test (the fuel tank refueling surface is on the ground at this time);

[0029] Figure 4 A schematic diagram of the internal state of the oil in the oil tank when the supporting device for simulating the test of evaporative emissions of the rubber hose part of the fuel tank provided by the present invention is placed in the test state (the test surface of the oil tank is on the ground at this time);

[0030] Figure 5 A flow chart of a test method for an evaporative emission simulation test supporting device based on a rubber hose portion in a fuel filler pipe provided by the present invention;

[0031] Among them, 1. oil storage tank, 2. hose plug, 3. tested hose;

[0032] 11. Oil tank filling surface, 12. Oil tank testing surface, 13. Oil tank filling port. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] See also Figures 1 to 4 The present invention provides a supporting device for evaporative emission simulation test of a hose part in a fuel filling pipe, comprising a fuel storage tank 1, a hose plug 2 and a tested hose 3;

[0038] The oil storage tank 1 is a hollow box;

[0039] The outer side wall of the oil storage tank 1 includes an adjacent oil storage tank filling surface 11 and an oil storage tank testing surface 12;

[0040] One end of the oil tank filling surface 11 is connected to one end of the oil tank testing surface 12;

[0041] There is a preset angle between the oil tank filling surface 11 and the oil tank testing surface 12;

[0042] The oil tank 1 is provided with an oil tank filling port 13 on the outer side wall adjacent to the other end of the oil tank test surface 12;

[0043] A fuel tank filling port 13, for injecting fuel (e.g. gasoline) for evaporative emission testing;

[0044] The outer end of the oil tank filling port 13 is sealed and connected to one end of the tested hose 3;

[0045] The other end of the tested rubber hose 3 is sealed with a rubber hose plug 2.

[0046] In the present invention, in specific implementation, the fuel tank filling port 13 is the same in shape and size as the fuel tank filling port one-way valve (i.e., fuel tank ICV valve) on the vehicle to be tested that is actually connected to the tested hose 3;

[0047] It should be noted that the refueling port one-way valve, referred to as the ICV valve, is a one-way valve used on the fuel tank of the car. During the refueling process of the fuel tank, the valve can prevent the fuel from spraying back and splashing back.

[0048] It should be noted that the structural dimensions of the fuel tank filling port 13 on the fuel tank 1 are consistent with the outer contour dimensions of the fuel tank ICV valve that is actually connected to the tested hose 3.

[0049] In specific implementation, the oil tank filling port 13 and the oil tank test surface 12 are parallel to each other;

[0050] In a specific implementation, the distance between the axial center line of the oil tank filling port 13 and the oil tank test surface 12 (i.e., the bottom surface) is a preset size, which is specifically equal to the distance between the fuel (e.g., gasoline) liquid level in the oil tank 1 and the oil tank test surface 12 when the oil tank test surface 12 is on the ground (i.e., in a test state), for example, 83.5 mm.

[0051] It should be noted that in actual use, a portion of fuel will remain in the interface portion connected to the fuel tank. In order to better simulate the actual situation, the test is designed according to the lower half of the fuel tank hose being immersed in fuel and the upper half being exposed to the air. Therefore, the distance between the axial centerline of the fuel tank filling port 13 and the fuel tank test surface 12 (i.e., the bottom surface) is used as a design parameter to calculate the liquid level position.

[0052] In the present invention, in a specific implementation, the angle between the oil tank filling surface 11 and the oil tank testing surface 12 is an obtuse angle.

[0053] In a specific implementation, the angle between the oil tank filling surface 11 and the oil tank testing surface 12 is in the range of 30° to 60°, preferably 45°.

[0054] It should be noted that the arrangement of the rubber hose part in the fuel filling pipe on the vehicle is limited by space and is basically arranged horizontally. In order to ensure the accuracy of the test results, the fuel tank designed by the present invention only retains one interface, which is used as the test connection interface of the rubber hose and also as the fuel filling port 13. In the refueling position, the fuel tank filling surface 11 is used as the bottom surface for refueling, and then switched to the test position, the fuel tank 1 is turned over to the ground with the fuel tank test surface 12, and the fuel tank test surface 12 is used as the bottom surface.

[0055] The requirement of a 45° tilt angle (i.e., the angle between the filling surface 11 of the fuel tank and the horizontal plane in the refueling state) is to match the shape of existing refueling guns on the market (inclined L-shape), which is more conducive to the operation of the refueling gun. At the same time, to flip from the refueling position to the test position, you only need to flip along the edge of the angle, which is also more labor-saving and convenient.

[0056] As mentioned above, the angle between the fuel tank filling surface 11 and the fuel tank testing surface 12 is mainly for the convenience of fuel filling, and can be 30° to 60°, with 45° being the best.

[0057] In the present invention, in a specific implementation, the total volume of the oil storage tank 1 is 9L, the dimensions are 250mm×200mm×200mm (corresponding to length×width×height respectively), and the oil storage tank filling surface 11 and the oil storage tank test surface 12 are 135°.

[0058] In the present invention, in a specific implementation, the outer contour size of the hose plug 2 is consistent with the outer contour size of the metal pipeline in the refueling pipe for matching and connecting with the tested hose 3 (that is, the two have the same shape and size).

[0059] In the present invention, in a specific implementation, the hose plug 2 is a solid plug (specifically a metal plug).

[0060] Based on the evaporative emission simulation test supporting device for the rubber hose portion in the fuel filler pipe provided by the present invention, the present invention also provides a test method based on the evaporative emission simulation test supporting device for the rubber hose portion in the fuel filler pipe, comprising the following steps:

[0061] Step S1, placing the fuel tank 1 on the ground with the fuel tank filling surface 11 touching the ground (i.e., the fuel tank is at the refueling position at this time), and using a refueling machine to fill a preset volume of fuel (e.g., gasoline) into the fuel tank 1 through the fuel tank filling port 13;

[0062] In the present invention, in step S1, in specific implementation, the preset volume of fuel (such as gasoline), preferably 40% of the total volume of the fuel tank 1, is filled with fuel (such as gasoline). The state of the fuel inside the fuel tank 1 is as follows: Figure 3 shown.

[0063] It should be noted that the preset volume is mainly based on the national standard document GB 18352.6-2016 "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)" (referred to as the National VI Standard), which stipulates that when conducting a vehicle evaporative emission test, 40% of the rated volume of fuel should be filled.

[0064] Step S2, one end of the tested hose 3 used for connecting with the oil storage tank 1 is sealed and connected with the oil storage tank filling port 13 on the oil storage tank 1, that is, it is installed in place according to the loading state, and the imprisonment state of the connection part is consistent with the loading state;

[0065] Step S3, the other end of the tested hose 3 is sealed and connected to the hose plug 2, that is, it is installed in place according to the loading state, and the imprisonment state of the connection part is consistent with the loading state;

[0066] Step S4, the fuel tank 1 is rotated so that the fuel tank 1 is placed on the ground with the fuel tank test surface 12 (the state of the fuel inside the fuel tank is as follows: Figure 4 As shown, the oil storage tank is in the test position), at this time, the lower half of the tested hose 3 is immersed in oil, and the upper half of the tested hose 3 is air (containing gasoline volatile components), so as to obtain the oil storage tank 1 with the tested hose 3 assembled and ready for testing;

[0067] In step S4, in specific implementation, the distance between the axial center line of the oil tank filling port 13 and the oil tank test surface 12 (i.e., the bottom surface) is a preset size, which is equal to the distance between the fuel (e.g., gasoline) liquid level in the oil tank 1 and the oil tank test surface 12 when the oil tank test surface 12 is on the ground (i.e., in the test state), for example, 83.5 mm.

[0068] Step S5, the oil storage tank 1 obtained in step S4, which has been prepared for the test and assembled with the tested hose 3, is horizontally moved into a sealed housing of evaporative emission determination (SHED), and continues to be placed on the ground with the test surface 12 of the oil storage tank in the evaporative emission determination sealed chamber (SHED), and then a vapor emission test is performed on the tested hose 3 on the oil storage tank 1 placed in the evaporative emission determination sealed chamber to obtain a vapor emission test result.

[0069] In the present invention, in step S5, regarding the evaporative emission test method of the tested hose 3, the measurement method described in the national standard document GB 18352.6-2016 "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)" (hereinafter referred to as National VI Standard) can be specifically adopted. Based on this measurement method, the evaporative emission test result can be obtained. This is a well-known technical means and will not be described in detail here.

[0070] In the present invention, in step S5, in specific implementation, it can be implemented as follows Figure 5 The procedure shown is for conducting evaporative emissions testing.

[0071] In step S5, a steam emission test (i.e., a heat soak test) is performed on the tested hose 3 on the oil storage tank 1 placed in the evaporation test closed chamber, which specifically includes the following steps:

[0072] The first step is to keep the temperature at 38°C for 1 hour. Specifically, in the closed chamber of the evaporation test, the oil storage tank 1 that has been prepared for the test and assembled with the tested hose 3 is kept at 38°C for a preset time (for example, 1 hour), so that the internal and external temperatures of the fuel in the oil storage tank 1 (i.e., the internal and external temperatures of the tooling oil) are both raised to 38°C. No data collection is performed during this process.

[0073] The second step is to perform a heat soak test at 38°C for 1 hour. Specifically, after the heat preservation time is up, start the hydrogen flame ionization detector (FID) to read the initial reading M 1 Keep the temperature at 38℃ for 1 hour and read the final reading M. 2 .

[0074] The third step is to keep the temperature at 20°C for 1 hour, specifically: lower the temperature in the evaporation test closed chamber (SHED) to 20°C and maintain it for 1 hour, so that the internal and external temperatures of the fuel in the fuel tank 1 (i.e., the internal and external temperatures of the tooling oil) are both cooled to 20°C.

[0075] Step 4: 24-hour day and night cycle test, specifically: start the hydrogen flame ionization detector (FID) again to read the initial reading N 1 Then, the temperature is controlled according to the temperature curve of 0h to 24h in the FB table FB.1 of the national standard document GB 18352.6-2016 "Light-duty Vehicle Pollutant Emission Limits and Measurement Methods (China Phase VI)" (hereinafter referred to as the National VI Standard). After the 24th hour of the test, the hydrogen flame ionization detector (FID) is started to read the final reading N 2 .

[0076] The fifth step is to calculate the test results (test results): specifically, to calculate and obtain the hydrocarbon concentration of the tested hose 3 installed on the fuel tank 1, that is, the steam emission test result of the hose part in the refueling pipe.

[0077] In the present invention, in specific implementation, the calculation formula of the heat soak test result is as follows:

[0078] M hsl =0.548×10 -5 ×P 0 ×V×(M 2 -M1 ), formula (1);

[0079] The calculation formula for the 24h diurnal breathing test results is as follows:

[0080] M dbl =0.587×10 -5 ×P 0 ×V×(N 2 -N 1 ), formula (2);

[0081] The total result calculation formula is:

[0082] M total =M hsl +M dbl , formula (3);

[0083] Among them, M total , is the total test result, unit is g;

[0084] M hsl , is the result of the heat soak test, unit is g;

[0085] M dbl , is the result of the diurnal breathing test, in g;

[0086] P 0 , is the ambient atmospheric pressure during the test, in kPa;

[0087] V is the net volume of the closed room, in m 3 ;

[0088] M 1 、M 2 、N 1 、N 2 , represent the hydrocarbon concentrations in the closed chamber (FID readings) at the beginning and end of the heat soak and diurnal breathing test phases, respectively, in ppm equivalent, without units.

[0089] It should be noted that, in the present invention, the derivation process is as follows:

[0090] The basic formula for testing hydrocarbon concentration using a hydrogen flame ionization detector (FID) is

[0091] M=k×V×10 -4 ×(C f ×P f / T f -C i ×P i / T i )+M out -M in , formula (4);

[0092] Where: k is a constant, 1.2×(12+H / C);

[0093] H / C is the carbon-hydrogen ratio constant. According to the specified results given in GB 18352.6-2016, the heat soak test is 2.20, and the day and night breathing test is 2.33;

[0094] V is the net volume of the closed room, in m 3 ;

[0095] P i , P f , is the initial and final air pressure of the closed room, in kPa. Since there is no carbon canister or other gas source in the test and the initial and final temperatures are the same, the ambient atmospheric pressure P can be directly brought in here. 0 ;

[0096] T i , T f , is the initial and final temperature of the sealed chamber, in K. The temperature in the sealed chamber is actively controlled by the equipment, and the initial and final temperatures of the two test processes are consistent. The temperature of the heat soak test is 311.15K (38℃), and the temperature of the day and night breathing test is 293.15K (20℃).

[0097] M in , M out , is the mass of hydrocarbons entering the closed chamber when the test is conducted in a fixed volume closed chamber, in g. This item is 0 when the test is conducted in a variable volume closed chamber; when the test is conducted in a fixed volume closed chamber, since the closed chamber is small and there is no carbon canister or other gas replenishing test, the test result of this item can also be ignored.

[0098] C i , C f , represents the initial and final hydrocarbon concentration in the closed chamber (FID reading), ppm equivalent, no unit.

[0099] For the present invention, k, P i , P f 、T i , T f , M in , M out By bringing several determined parameters into the calculation, the calculation result of the above calculation formula (4) can be obtained, that is, the hydrocarbon concentration of the tested hose 3 installed on the fuel tank 1 is calculated, that is, the steam emission test result of the hose part in the refueling pipe is obtained.

[0100] In summary, compared with the prior art, the evaporative emission simulation test supporting device and test method for the hose part in the fuel filler pipe provided by the present invention are scientifically designed and can simulate the actual working conditions of the hose part in the fuel filler pipe of the vehicle used to connect with the fuel tank, so as to perform an evaporative emission simulation test on the hose part in the fuel filler pipe used to connect with the fuel tank, and then understand the evaporative emission conditions of the fuel filler pipe, which is conducive to understanding the technical performance of the vehicle.

[0101] After inspection, through the application of the present invention, the present invention is an evaporative emission test supporting tooling for the hose part of the fuel filler pipe used to connect with the fuel tank, which is convenient for filling fuel and simulates the actual situation, which is helpful to fill the gap in the evaporative emission test of the fuel filler pipe.

[0102] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A device for simulating the evaporative emission test of the rubber hose part of the fuel pipe, characterized in that: It comprises an oil storage tank (1), a hose plug (2) and a hose to be tested (3); The oil storage tank (1) is a hollow box; The outer side wall of the oil storage tank (1) comprises an adjacent oil storage tank filling surface (11) and an oil storage tank testing surface (12); One end of the oil tank filling surface (11) is connected to one end of the oil tank testing surface (12); There is a preset angle between the oil tank filling surface (11) and the oil tank testing surface (12); The oil tank (1) is provided with an oil tank filling port (13) on an outer side wall adjacent to the other end of the oil tank test surface (12); A fuel tank filling port (13) for injecting fuel for evaporative emission testing; The outer end of the oil tank filling port (13) is sealed and connected to one end of the rubber hose (3) to be tested; The other end of the tested rubber hose (3) is sealed with a rubber hose plug (2).

2. The evaporative emission simulation test device for the rubber hose portion of the fuel filler pipe as claimed in claim 1, characterized in that: The fuel tank filling port (13) is of the same shape and size as the one-way valve of the fuel tank filling port on the vehicle to be tested and is actually connected to the tested hose (3); The outer contour size of the hose plug (2) is consistent with the outer contour size of the metal pipeline in the refueling pipe used for matching and connecting with the tested hose (3).

3. The evaporative emission simulation test supporting device for the rubber hose portion of the fuel filler pipe as claimed in claim 1, characterized in that: The oil tank filling port (13) and the oil tank test surface (12) are parallel to each other; The distance between the axial center line of the oil tank filling port (13) and the oil tank test surface (12) is equal to the distance between the fuel liquid level in the oil tank (1) and the oil tank test surface (12) when the oil tank test surface (12) touches the ground.

4. The evaporative emission simulation test supporting device for the rubber hose portion of the fuel filler pipe as claimed in claim 1, characterized in that: The angle between the oil tank filling surface (11) and the oil tank testing surface (12) is in the range of 30° to 60°.

5. The evaporative emission simulation test supporting device for the rubber hose portion of the fuel filler pipe as claimed in claim 4, characterized in that: The angle between the oil tank filling surface (11) and the oil tank testing surface (12) is 45°.

6. The evaporative emission simulation test supporting device for the rubber hose portion of the fuel filler pipe as claimed in claim 1, characterized in that: The outer contour size of the hose plug (2) is consistent with the outer contour size of the metal pipeline in the refueling pipe used for matching and connecting with the tested hose (3).

7. The evaporative emission simulation test supporting device for the rubber hose portion of the fuel filler pipe as claimed in claim 1, characterized in that: The hose plug (2) is a solid metal plug.

8. A test method based on the evaporative emission simulation test supporting device of the rubber hose part of the fuel filler pipe according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1, placing the oil storage tank (1) on flat ground with the oil storage tank filling surface (11) touching the ground, and using a fuel dispenser to fill the oil storage tank (1) with a preset volume of fuel through the oil storage tank filling port (13); Step S2, sealingly connecting one end of the tested rubber hose (3) for connecting with the oil storage tank (1) to the oil storage tank filling port (13) on the oil storage tank (1); Step S3, sealingly connecting the other end of the tested hose (3) to the hose plug (2); Step S4, rotating the oil storage tank (1) so that the oil storage tank (1) is placed on the ground with the oil storage tank test surface (12), so that the lower half of the tested hose (3) is immersed in oil and the upper half of the tested hose (3) is filled with air, thereby obtaining an oil storage tank (1) that is ready for testing and has been assembled with the tested hose (3); Step S5, the oil storage tank (1) obtained in step S4, which has been prepared for the test and assembled with the tested hose (3), is horizontally moved into the evaporation test closed chamber, and is continuously placed with the test surface (12) of the oil storage tank touching the ground in the evaporation test closed chamber, and then a steam emission test is performed on the tested hose (3) on the oil storage tank (1) placed in the evaporation test closed chamber to obtain a steam emission test result.

9. The testing method according to claim 8, characterized in that: In step S1, the preset volume of fuel is 40% of the total volume of the fuel tank 1; In step S4, the distance between the axial center line of the oil tank filling port (13) and the oil tank test surface (12) is equal to the distance between the fuel liquid level in the oil tank (1) and the oil tank test surface (12) when the oil tank test surface (12) touches the ground.

10. The testing method according to claim 8, characterized in that: In step S5, a vapor emission test is performed on the tested hose (3) on the oil storage tank (1) placed in the evaporation test closed room, which specifically includes the following steps: The first step is to keep the temperature at 38°C for 1 hour, specifically: in a closed evaporation test chamber, keep the oil storage tank (1) that has been prepared for the test and assembled with the tested hose (3) at a temperature of 38°C for a preset time, so that the temperature of the fuel inside and outside the oil storage tank (1) is raised to 38°C; The second step is a heat soak test at 38°C for 1 hour. Specifically, after the heat preservation time is up, the hydrogen flame ionization detector FID is started to read the initial reading M1, and after maintaining the temperature at 38°C for 1 hour, the final reading M2 is read; The third step is to keep the temperature at 20°C for 1 hour, specifically: lower the temperature in the evaporation test closed chamber to 20°C and keep it for 1 hour, so that the temperature inside and outside the fuel tank (1) is lowered to 20°C; The fourth step is a 24-hour day and night cycle test, specifically: start the hydrogen flame ionization detector FID again to read the initial reading N1, then perform temperature control, and after the 24th hour test, start the hydrogen flame ionization detector FID to read the final reading N2; The fifth step is to calculate the test results: specifically, to calculate and obtain the hydrocarbon concentration of the tested hose (3) installed on the oil storage tank (1), that is, the steam emission test result of the hose part in the refueling pipe.

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