A vehicle fuel evaporation emission testing device

Abstract

The invention discloses a vehicle fuel evaporation emission testing device, which relates to the technical field of emission testing, and comprises a testing chamber, a suction pipeline, a temperature control component and an air supply pipeline which are sequentially connected in series and form a loop, wherein the air supply pipeline is also connected in series with a collection chamber and a pump body, wherein a first sensor is arranged in the collection chamber for obtaining a first fuel evaporation gas concentration, wherein a vehicle and a protection chamber are placed in the testing chamber, wherein a fuel tank is placed in the protection chamber, wherein the protection chamber is made of a heat-conducting material, wherein one side of the protection chamber is connected with a through pipe, wherein one end of the through pipe away from the protection chamber is in a closed shape and extends out of the protection chamber, wherein a second sensor is further arranged outside the testing chamber, wherein a detection end of the second sensor extends into the through pipe for obtaining a second fuel evaporation gas concentration, wherein the device can simultaneously detect the fuel evaporation gas concentrations of the vehicle and the fuel tank, thereby greatly improving the detection efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of emission testing, in particular to a vehicle fuel evaporation emission testing device. Background Art

[0002] With the rapid development of the global automobile industry, the number of cars has increased dramatically. This trend has promoted economic development while also bringing unprecedented challenges to the environment. The awakening of environmental awareness, especially the focus on air quality and greenhouse gas emissions, has prompted the automobile industry and regulatory agencies to shift their focus to reducing pollutant emissions throughout the life cycle of vehicles. Among them, automobile fuel evaporation emissions are an important source of pollution when not in driving state, and its control and management are particularly critical.

[0003] Automobile fuel evaporative emissions are the release of volatile organic compounds (VOCs) caused by factors such as ambient temperature fluctuations, changes in fuel tank pressure, and natural evaporation. These VOCs not only exacerbate the photochemical smog problem in cities and affect air quality, but may also accumulate through the food chain and cause long-term adverse effects on human health, such as increasing the risk of respiratory diseases and allergic reactions.

[0004] In view of this, it is very important to develop an efficient, accurate and easy-to-operate vehicle fuel evaporation emission test device. Such a test device can not only accurately evaluate the sealing performance of the vehicle fuel system, timely discover and repair potential leaks, but also quantify the specific values ​​of fuel evaporation under different working conditions, providing data support for automobile manufacturers to optimize fuel system design.

[0005] In contrast, the limitations of traditional testing methods are becoming increasingly prominent. Although the single closed chamber test method can simulate the environmental conditions of a parked vehicle to a certain extent, it cannot independently detect the evaporative emission characteristics of key components such as the fuel tank and charcoal canister, resulting in deviations in the test results. In addition, the inaccuracy of temperature and pressure control affects the accuracy of the test data. At the same time, the long time required, cumbersome operation and high cost of traditional testing methods also increase the burden on enterprises.

[0006] Therefore, it is necessary to provide a vehicle fuel evaporation emission testing device to solve the above problems. Summary of the invention

[0007] In order to solve the above problems, the present invention provides the following technical solutions: an automobile fuel evaporative emission test device, comprising a test chamber, a suction pipeline, a temperature control component and an air supply pipeline which are sequentially connected in series and form a loop, wherein the air supply pipeline is also connected in series with a collection chamber and a pump body, and a first sensor is provided in the collection chamber for obtaining a first fuel evaporative gas concentration;

[0008] Wherein, the test chamber is a closed chamber and has a sealed door that can be opened and closed;

[0009] A car and a protection compartment are placed in the test compartment;

[0010] Wherein, an oil tank is placed in the protection chamber, the protection chamber is made of heat-conducting material, one side of the protection chamber is connected with a through pipe, and one end of the through pipe away from the protection chamber is closed and extends out of the protection chamber;

[0011] A second sensor is also arranged outside the test chamber, and a detection end of the second sensor extends into the through pipe to obtain a second fuel evaporation gas concentration.

[0012] Further, preferably, the temperature control component comprises:

[0013] a temperature control pipe, one end of which is connected to the suction pipeline and the other end of which is connected to the air supply pipeline;

[0014] A cooling pipe, an outer pipe, and a cooler are sequentially connected in series to form a loop, wherein the cooling pipe is located inside the temperature control pipe, and the outer pipe and the cooler are located outside the temperature control pipe;

[0015] A heating wire, which is wound around the outside of the temperature control tube;

[0016] Wherein, the cooling tube is made of heat-conducting material.

[0017] Furthermore, preferably, the temperature control tube and the heating wire are both covered with a protective sleeve.

[0018] Further, as a preference, the protection bin comprises a bin body, the bin body having an upper opening, the upper opening being sealed by a cover body, and two symmetrically arranged extension plates extending below the cover body are formed.

[0019] Further, as a preference, a positioning component is also provided in the protection compartment, and the positioning component comprises:

[0020] A lifter, which is fixed in the bin body and has a lifting end;

[0021] A lifting seat, which is fixed to the lifting end, and both sides of the lifting seat have teeth so as to mesh with the first gear;

[0022] A second gear meshing with the first gear, and a driving wheel coaxially arranged is fixed on the second gear;

[0023] A driven wheel is connected to the driving wheel through a belt transmission, and a positioning arm is installed on one side of the driven wheel;

[0024] Wherein, the first gear, the second gear and the driven wheel are all rotatably arranged in the protection compartment.

[0025] Further, as a preference, a buffer pad is fixed to the upper surface of the lifting seat for placing the oil tank; and a positioning head is fixed to one end of the positioning arm away from the driven wheel.

[0026] Further, preferably, a bypass pipeline is connected in parallel to the suction pipeline, a filter bin is connected in series to the bypass pipeline, a filter plate group placed vertically is fixed in the filter bin, and the filter plate group can separate the filter bin into a first area and a second area, wherein the first area is close to the temperature control component, and a dust collecting bin is installed at the bottom of the second area;

[0027] A second valve body is provided at the air inlet end of the bypass pipeline;

[0028] A first valve body is arranged on the parallel section on the suction pipeline.

[0029] Further, as a preference, the air outlet end of the air supply pipeline is connected to an air equalizing head, and the air inlet end of the suction pipeline is connected to an air collecting head, and the air equalizing head and the air collecting head are both located in the test chamber.

[0030] Furthermore, preferably, a heat transfer liquid is pre-installed in the protection chamber for semi-immersing the oil tank, and a grid-shaped heat transfer plate is also spaced apart on one side of the gas collecting head, and one end of the heat transfer plate also extends into the protection chamber and contacts with the heat transfer liquid.

[0031] Furthermore, preferably, a temperature sensor is also provided in the test chamber.

[0032] Compared with the prior art, the present invention provides a vehicle fuel evaporation emission test device, which has the following beneficial effects:

[0033] 1. In the present invention, the testing device can simultaneously detect the concentration of fuel evaporation gas in the car and the fuel tank, greatly improving the detection efficiency. The traditional method may require the two tests to be performed separately, but the present device realizes parallel detection, saving time and resources.

[0034] 2. In the present invention, by providing a suction pipeline, an air supply pipeline and a pump body, uniform circulation of gas inside the test chamber is achieved. This circulation mechanism ensures that the gas concentration in each area of ​​the test chamber remains consistent, thereby avoiding measurement errors caused by uneven gas distribution and improving the accuracy of detection.

[0035] 3. In the present invention, the protection chamber is made of heat-conducting material, so that the temperature control component can indirectly affect the protection chamber by controlling the temperature of the gas in the test chamber, ensuring that the ambient temperature of the fuel tank is consistent with that of the test chamber. This design eliminates the influence of temperature differences on the test results and further improves the accuracy of the test.

[0036] 4. In the present invention, the gas in the test chamber can be led out to the outside of the test chamber by arranging a suction pipeline and an air supply pipeline, so as to facilitate the use of the first sensor to measure the first fuel evaporation gas concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a vehicle fuel evaporative emission testing device;

[0038] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at point A;

[0039] Figure 3 This is a schematic diagram of the structure of a temperature control component in a vehicle fuel evaporative emission testing device;

[0040] In the figure: 1. test chamber; 2. suction pipeline; 3. temperature control component; 4. protective sleeve; 5. collection chamber; 6. first sensor; 7. pump body; 8. air supply pipeline; 9. positioning component; 10. fuel tank; 11. automobile; 12. protective chamber; 13. through pipe; 14. second sensor; 16. gas equalizing head; 17. gas collecting head; 18. heat conducting plate; 19. temperature sensor; 20. bypass pipeline; 21. first valve body; 2 2. Second valve body; 23. Filter bin; 24. Filter plate group; 25. Dust bin; 31. Temperature control tube; 32. Heating wire; 33. Cooling tube; 34. Outer tube; 35. Cooler; 91. Lifter; 92. Lifting seat; 93. First gear; 94. Second gear; 95. Positioning arm; 96. Driven wheel; 97. Driving wheel; 98. Positioning head; 121. Bin body; 122. Cover body; 123. Extension plate. DETAILED DESCRIPTION

[0041] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0042] Please refer to Figure 1-Figure 3 In an embodiment of the present invention, a vehicle fuel evaporation emission test device is provided, comprising a test chamber 1, a suction pipeline 2, a temperature control component 3, and an air supply pipeline 8 which are sequentially connected in series and form a loop, wherein the air supply pipeline 8 is also connected in series with a collection chamber 5 and a pump body 7, and a first sensor 6 is provided in the collection chamber 5 for obtaining a first fuel evaporation gas concentration;

[0043] The test chamber 1 is a closed chamber having a sealed door that can be opened and closed;

[0044] A car 11 and a protection chamber 12 are placed in the test chamber 1;

[0045] The oil tank 10 is placed in the protection chamber 12. The protection chamber 12 is made of heat-conducting material. A through pipe 13 is connected to one side of the protection chamber 12. The end of the through pipe 13 away from the protection chamber 12 is closed and extends out of the protection chamber 12.

[0046] A second sensor 14 is further disposed outside the test chamber 1 , and a detection end of the second sensor 14 extends into the through pipe 13 to obtain a second fuel evaporation gas concentration.

[0047] Among them, by setting up the suction pipeline 2 and the air supply pipeline 8, the gas in the test chamber 1 can be led out to the outside of the test chamber 1, so as to facilitate the use of the first sensor 6 to perform the first fuel evaporation gas concentration. In addition, by setting up the suction pipeline 2, the pump body 7, and the air supply pipeline 8, uniform circulation of the gas inside the test chamber 1 can be achieved to ensure the accuracy of the detection.

[0048] Wherein, the first fuel evaporation gas concentration refers to the fuel evaporation gas concentration of the vehicle 11;

[0049] The second fuel evaporation gas concentration refers to the fuel evaporation gas concentration of the fuel tank 10. Of course, other components to be tested can also be placed in the protection chamber 12. In practice, the fuel tank 10 is the main component.

[0050] That is to say, in this embodiment, the fuel evaporation gas concentration of the automobile 11 and the fuel tank 10 can be detected at the same time, thereby improving the detection efficiency;

[0051] Among them, the oil tank 10 is independently placed in the protection chamber 12, and the protection chamber 12 is made of heat-conducting material. Therefore, the temperature control treatment of the gas in the test chamber 1 by the temperature control component 3 can affect the protection chamber 12, so that its internal temperature is consistent with the temperature in the test chamber 1.

[0052] In this embodiment, the temperature control component 3 includes:

[0053] A temperature control pipe 31, one end of which is connected to the suction pipeline 2, and the other end of which is connected to the air supply pipeline 8;

[0054] A cooling pipe 33, an outer pipe 34, and a cooler 35 are sequentially connected in series to form a loop, wherein the cooling pipe 33 is located inside the temperature control pipe 31, and the outer pipe 34 and the cooler 35 are located outside the temperature control pipe 31;

[0055] A heating wire 32, which is wound around the outside of the temperature control tube 31;

[0056] Wherein, the cooling tube 33 is made of heat-conducting material.

[0057] In addition, the temperature control tube 31 and the heating wire 32 are both covered with a protective sleeve 4 .

[0058] The cooling tube 33 is located inside the temperature control tube 31. This nested structure makes the heat exchange more efficient. When the heating wire 32 is heated, the gas inside the temperature control tube 31 is heated, and then the gas in the test chamber is heated; conversely, when the cooler 35 is working, the heat is quickly taken away through the outer tube 34, achieving rapid cooling.

[0059] The temperature control tube 31 and the heating wire 32 are both covered with a protective sleeve 4, which can not only protect the heating wire from direct influence of the external environment and extend its service life, but also improve the structural strength and safety of the entire temperature control assembly.

[0060] In this embodiment, the protection bin 12 includes a bin body 121 . The bin body 121 has an upper opening, which is sealed by a cover body 122 . Two symmetrically arranged extension plates 123 are extended from the bottom of the cover body 122 .

[0061] In addition, a positioning assembly 9 is also provided in the protection compartment 12, and the positioning assembly 9 includes:

[0062] A lifter 91, which is fixed in the bin body 121 and has a lift end;

[0063] A lifting seat 92 is fixed to the lifting end, and both sides of the lifting seat 92 have teeth so as to mesh with the first gear 93;

[0064] A second gear 94 meshes with the first gear 93, and a driving wheel 97 coaxially arranged is fixed to the second gear 94;

[0065] A driven wheel 96 is connected to the driving wheel 97 via a belt transmission, and a positioning arm 95 is installed on one side of the driven wheel 96;

[0066] The first gear 93 , the second gear 94 , and the driven wheel 96 are all rotatably disposed in the protection compartment 12 .

[0067] Preferably, a buffer pad is fixed on the upper surface of the lifting seat 92 for placing the oil tank 10 ; and a positioning head 98 is fixed on one end of the positioning arm 95 away from the driven wheel 96 .

[0068] During implementation, the oil tank 10 is first placed on the buffer pad, and then the cover body 122 is placed at the opening of the bin body 121. At this time, the lifter 91 drives the lifting seat 92 to rise until the oil tank 10 contacts the extension plate 123, thereby realizing the positioning of the oil tank 10. At the same time, the first gear 93 rotates with the rise of the lifting seat 92, and then drives the driven wheel 96 to rotate through the second gear 94 and the driving wheel 97, so that the two positioning arms 95 deflect and clamp the extension plate 123 through the positioning head 98, thereby forming the positioning of the cover body 122 to ensure its sealing.

[0069] It should be noted that the positioning head 98 contacts the extension plate 123 first, and then the oil tank 10 contacts the extension plate 123 .

[0070] In this embodiment, a bypass pipeline 20 is connected in parallel to the suction pipeline 2, and a filter bin 23 is connected in series to the bypass pipeline 20. A filter plate group 24 placed vertically is fixed in the filter bin 23. The filter plate group 24 can separate the filter bin 23 into a first area and a second area, wherein the first area is close to the temperature control component 3, and a dust collecting bin 25 is installed at the bottom of the second area;

[0071] The air inlet end of the bypass line 20 is provided with a second valve body 22;

[0072] A first valve body 21 is provided on the parallel section of the suction pipeline 2 .

[0073] The implementation phases include:

[0074] Initial preparation stage:

[0075] The first valve body 21 is closed, and the second valve body 22 is opened, so that the gas in the test chamber 1 enters the filter chamber 23 through the bypass pipeline 20 .

[0076] The gas is filtered by the filter plate group 24 in the filter chamber 23, and large particles of impurities and pollutants are trapped in the second area, while the cleaner gas passes through the filter plate group and enters the first area.

[0077] At the bottom of the second area, the dust collecting bin 25 collects the filtered impurities to ensure the filtering effect.

[0078] Gas filtration stage:

[0079] Before the test begins, continue running this filtering mode until it is confirmed that the gas in the test chamber 1 reaches the required purity.

[0080] Whether the gas purity meets the standard can be determined by monitoring the data of the first sensor 6. When the data is stable and lower than a preset threshold, it can be considered that the gas is pure enough.

[0081] Test preparation phase:

[0082] The second valve body 22 is closed and the first valve body 21 is opened, so that the gas in the test chamber 1 no longer passes through the filter chamber 23, but directly enters the temperature control component 3 and the air supply pipeline 8 through the suction pipeline 2 for circulation.

[0083] At this time, the gas in the test chamber 1 is kept in a relatively stable, preliminarily filtered, pure state, ready for the subsequent fuel evaporation gas concentration detection.

[0084] Test execution phase:

[0085] According to the established test process, the temperature control component 3 is started to adjust the temperature in the test chamber 1 to simulate the evaporation of fuel under different working conditions.

[0086] At the same time, the first sensor 6 and the second sensor 14 monitor the concentration of fuel evaporation gas in the vehicle 11 and the fuel tank 10 respectively, and record the relevant data.

[0087] Data analysis and evaluation:

[0088] After the test, the collected data is sorted and analyzed to evaluate whether the fuel evaporation performance of the vehicle 11 and the fuel tank 10 meets the relevant standards and requirements.

[0089] That is to say, in this embodiment, by pre-filtering the gas in the test chamber 1, the interference of large particle impurities and pollutants on the test results is removed, and the accuracy of subsequent tests is improved. By controlling the on and off of the first valve body 21 and the second valve body 22, it is possible to flexibly switch between gas filtering before the test and maintaining gas circulation during the test. The design of the filter chamber 23 and the dust collection chamber 25 is convenient for cleaning and maintenance, extending the service life of the equipment.

[0090] In order to further ensure the uniformity of the gas in the test chamber 1 , the air outlet end of the air supply pipeline 8 is connected to a gas equalizing head 16 , and the air inlet end of the suction pipeline 2 is connected to a gas collecting head 17 . Both the gas equalizing head 16 and the gas collecting head 17 are located in the test chamber 1 .

[0091] In order to further ensure that the temperature inside the protection chamber 2 is consistent with the temperature in the test chamber 1, a heat transfer liquid is pre-installed in the protection chamber 12 for semi-immersing the oil tank 10, and a grid-shaped heat transfer plate 18 is also arranged at intervals on one side of the gas collecting head 17, and one end of the heat transfer plate 18 also extends into the protection chamber 12 and contacts with the heat transfer liquid.

[0092] In addition, a temperature sensor 19 is also provided in the test chamber 1 .

[0093] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vehicle fuel evaporation emission testing device, characterized in that: The device comprises a test chamber (1), a suction pipeline (2), a temperature control component (3), and an air supply pipeline (8) which are sequentially connected in series to form a loop, wherein the air supply pipeline (8) is also connected in series with a collection chamber (5) and a pump body (7), and a first sensor (6) is provided in the collection chamber (5) for obtaining a first fuel evaporation gas concentration; Wherein, the test chamber (1) is a closed chamber and has a sealed door that can be opened and closed; A car (11) and a protection chamber (12) are placed in the test chamber (1); An oil tank (10) is placed in the protection chamber (12); the protection chamber (12) is made of a heat-conducting material; one side of the protection chamber (12) is connected to a through pipe (13); an end of the through pipe (13) away from the protection chamber (12) is closed and extends out of the protection chamber (12); A second sensor (14) is also provided outside the test chamber (1), and a detection end of the second sensor (14) extends into the through pipe (13) for obtaining a second fuel evaporation gas concentration; The protection bin (12) comprises a bin body (121), the bin body (121) having an upper opening, the upper opening being sealed by a cover body (122), and two symmetrically arranged extension plates (123) extending from the bottom of the cover body (122); The protection chamber (12) is further provided with a positioning component (9), and the positioning component (9) comprises: A lifter (91) fixed in the bin body (121) and having a lift end; A lifting seat (92) is fixed to the lifting end, and both sides of the lifting seat (92) have teeth so as to mesh with the first gear (93); a second gear (94) meshing with the first gear (93), and a driving wheel (97) coaxially arranged is fixed to the second gear (94); A driven wheel (96) connected to the driving wheel (97) via a belt transmission, and a positioning arm (95) is installed on one side of the driven wheel (96); Wherein, the first gear (93), the second gear (94), and the driven wheel (96) are all rotatably disposed in the protection compartment (12); A bypass pipeline (20) is connected in parallel to the suction pipeline (2), a filter bin (23) is connected in series to the bypass pipeline (20), a filter panel group (24) placed vertically is fixed in the filter bin (23), and the filter panel group (24) is capable of dividing the filter bin (23) into a first area and a second area, wherein the first area is close to the temperature control component (3), and a dust collection bin (25) is installed at the bottom of the second area; A second valve body (22) is provided at the air inlet end of the bypass pipeline (20); A first valve body (21) is provided on the parallel section on the suction pipeline (2).

2. The vehicle fuel evaporative emission testing device according to claim 1, characterized in that: The temperature control component (3) comprises: a temperature control pipe (31), one end of which is connected to the suction pipeline (2) and the other end of which is connected to the air supply pipeline (8); A cooling pipe (33), an outer pipe (34), and a cooler (35) are sequentially connected in series to form a loop, wherein the cooling pipe (33) is located inside the temperature control pipe (31), and the outer pipe (34) and the cooler (35) are located outside the temperature control pipe (31); A heating wire (32) wound around the outside of the temperature control tube (31); Wherein, the cooling tube (33) is made of a heat-conducting material.

3. The automobile fuel evaporative emission testing device according to claim 2, characterized in that: The temperature control tube (31) and the heating wire (32) are both covered with a protective sleeve (4).

4. The automobile fuel evaporative emission testing device according to claim 1, characterized in that: A buffer pad is fixed on the upper surface of the lifting seat (92) for placing the oil tank (10); a positioning head (98) is fixed on one end of the positioning arm (95) away from the driven wheel (96).

5. The automobile fuel evaporative emission testing device according to claim 1, characterized in that: The air outlet end of the air supply pipeline (8) is connected to an air equalizing head (16), and the air inlet end of the suction pipeline (2) is connected to an air collecting head (17). Both the air equalizing head (16) and the air collecting head (17) are located in the test chamber (1).

6. The automobile fuel evaporative emission testing device according to claim 5, characterized in that: The protection chamber (12) is pre-installed with heat transfer liquid for semi-wetting the oil tank (10); a grid-shaped heat transfer plate (18) is also arranged at intervals on one side of the gas collecting head (17); one end of the heat transfer plate (18) extends into the protection chamber (12) and contacts the heat transfer liquid.

7. The automobile fuel evaporative emission testing device according to claim 1, characterized in that: A temperature sensor (19) is also provided in the test chamber (1).

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