Intelligent testing device for fuel tank durability in whole life cycle

Abstract

The utility model belongs to test technical field discloses a kind of fuel tank full life cycle durability intelligent testing device, including air compressor, the interface one of air compressor connection positive pressure tank, the positive pressure tank is equipped with positive pressure tank safety valve and positive pressure tank pressure tester, the interface two of positive pressure tank connects first air filter, first air filter connects first electrical proportional valve, first electrical proportional valve connects first pilot solenoid valve, first pressure sensor B is equipped between first electrical proportional valve and first pilot solenoid valve, first pilot solenoid valve connection channel one, channel one connects first absolute pressure sensor.The utility model has beneficial effect: for the positive pressure, negative pressure durability and pulse alternating pressure test of fuel tank and other products, test result is accurate.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, and in particular to an intelligent testing device for the durability of a fuel tank throughout its entire life cycle. Background Technology

[0002] As a crucial component of a vehicle's fuel system, the fuel tank's durability directly impacts the vehicle's safety and reliability. In real-world use, fuel tanks face various complex conditions, such as: positive pressure conditions: fuel evaporation or high temperatures increase internal pressure, potentially leading to deformation or seal failure; negative pressure conditions: fuel consumption creates negative pressure inside the tank, which may cause tank collapse or abnormal fuel pump supply; alternating pulse pressure conditions: vibrations and bumps during vehicle operation cause cyclical pressure changes in the fuel tank, which, over time, can lead to fatigue cracking or weld failure. Therefore, fuel tanks must undergo rigorous durability testing to ensure they do not fail due to pressure variations, vibrations, or temperature fluctuations throughout their entire lifespan, thus preventing fuel leaks, fire risks, or excessive emissions.

[0003] Traditional fuel tank durability testing primarily employs static pressure testing and pulse pressure testing methods. However, traditional static pressure testing only applies a constant positive or negative pressure, failing to simulate dynamic pressure changes under real-world operating conditions. Pulse pressure testing uses hydraulic or pneumatic systems for pressure cycling, but suffers from low control accuracy, high energy consumption, and slow response speed. Semi-automated testing systems still rely on manual intervention, resulting in low testing efficiency and difficulty in achieving accurate pressure curve simulation.

[0004] Therefore, it is necessary to provide an intelligent testing device for the entire life cycle durability of fuel tanks, used for positive pressure, negative pressure durability performance and pulse alternating pressure tests of products such as fuel tanks. Utility Model Content

[0005] This utility model discloses an intelligent testing device for the durability of fuel tanks throughout their entire life cycle, which can effectively solve the technical problems involved in the background art.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A fuel tank full life cycle durability intelligent testing device for testing the fuel tank under test includes an air compressor, the air compressor being connected to a positive pressure tank via an interface one, the positive pressure tank being equipped with a positive pressure tank safety valve and a positive pressure tank pressure tester, the positive pressure tank via an interface two being connected to a first air filter, the first air filter being connected to a first electro-proportional valve, the first electro-proportional valve being connected to a first pilot solenoid valve, a first pressure sensor B being provided between the first electro-proportional valve and the first pilot solenoid valve, the first pilot solenoid valve being connected to a channel one, the channel one being connected to a first absolute pressure sensor;

[0008] The first channel is connected to the fourth pilot solenoid valve, the fourth pilot solenoid valve is connected to the oil-water separator, the oil-water separator is connected to the first interface of the negative pressure tank, the second interface of the negative pressure tank is connected to the vacuum pump, the negative pressure tank is equipped with a negative pressure tank safety valve and a negative pressure tank pressure tester, and a negative pressure sensor is provided between the oil-water separator and the first interface of the negative pressure tank.

[0009] The first channel is connected to the first fuel tank under test, which is equipped with a first displacement sensor. The testing device also includes a PLC, which is connected to the first displacement sensor and a recording device.

[0010] As a preferred improvement of this utility model: the air compressor is connected to the interface one of the positive pressure tank through a three-stage filter, and the positive pressure tank is equipped with a drain valve.

[0011] As a preferred improvement of this utility model: the interface two of the positive pressure tank is connected to a triplet, the triplet is connected to the first pilot solenoid valve and the fourth pilot solenoid valve, and a pressure sensor A is provided between the interface two of the positive pressure tank and the first air filter.

[0012] As a preferred improvement of this utility model: the first channel is connected to the seventh pilot solenoid valve, and the seventh pilot solenoid valve is connected to the first silencer.

[0013] As a preferred improvement of this utility model: the positive pressure tank pressure tester and the negative pressure tank pressure tester are pressure gauges.

[0014] As a preferred improvement of this utility model: the first displacement sensor is a displacement spring self-resetting sensor, and the recording device is a paperless recorder.

[0015] As a preferred improvement of this utility model: the interface two of the positive pressure tank is connected to a second air filter, the second air filter is connected to a second electro-proportional valve, the second electro-proportional valve is connected to a second pilot solenoid valve, a second pressure sensor B is provided between the second electro-proportional valve and the second pilot solenoid valve, the second pilot solenoid valve is connected to channel two, the channel two is connected to a second absolute pressure sensor, the channel two is connected to an eighth pilot solenoid valve, the eighth pilot solenoid valve is connected to a second muffler, the channel two is connected to a fifth pilot solenoid valve, the fifth pilot solenoid valve is connected to an oil-water separator, the channel two is connected to the fuel tank under test, and the fuel tank under test is provided with a second displacement sensor.

[0016] As a preferred improvement of this utility model: the interface two of the positive pressure tank is connected to a third air filter, the third air filter is connected to a third electro-proportional valve, the third electro-proportional valve is connected to a third pilot solenoid valve, a third pressure sensor B is provided between the third electro-proportional valve and the third pilot solenoid valve, the third pilot solenoid valve is connected to channel three, channel three is connected to a third absolute pressure sensor, channel three is connected to a ninth pilot solenoid valve, the ninth pilot solenoid valve is connected to a third muffler, channel three is connected to a sixth pilot solenoid valve, the sixth pilot solenoid valve is connected to an oil-water separator, channel three is connected to the fuel tank under test, and the fuel tank under test is provided with a third displacement sensor.

[0017] As a preferred improvement of this utility model, the air compressor is a screw air compressor.

[0018] The beneficial effects of this utility model are as follows:

[0019] It is used for positive pressure and negative pressure durability performance and pulse alternating pressure tests on products such as fuel tanks. It can simulate the oil and gas pressure and negative pressure formed by the oil pump suction that may occur during the use, transportation and storage of fuel tanks, thereby evaluating the integrity of the product structure and environmental adaptability, and realizing the durability assessment of fuel tanks throughout their entire life cycle. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a schematic diagram of an intelligent testing device for the life-cycle durability of a fuel tank according to the present invention. Figure One ;

[0022] Figure 2 This is a schematic diagram of an intelligent testing device for the life-cycle durability of a fuel tank according to the present invention. Figure Two .

[0023] In the diagram: 1-Air compressor, 2-Three-stage filter, 3-Positive pressure tank, 4-Positive pressure tank safety valve, 5-Positive pressure tank pressure tester, 6-Negative pressure tank, 7-Negative pressure tank safety valve, 8-Negative pressure tank pressure tester, 9-Vacuum pump, 10-Triple unit, 11-Pressure sensor A, 12-First air filter, 13-Second air filter, 14-Third air filter, 15-First electro-proportional valve, 16-Second electro-proportional valve, 17-Third electro-proportional valve, 18-First pressure sensor B, 19-Second pressure sensor B, 20-Third pressure sensor B, 21-First pilot solenoid valve, 2 2-Second pilot solenoid valve, 23-Third pilot solenoid valve, 24-Fourth pilot solenoid valve, 25-Fifth pilot solenoid valve, 26-Sixth pilot solenoid valve, 27-Seventh pilot solenoid valve, 28-Eighth pilot solenoid valve, 29-Ninth pilot solenoid valve, 30-Third silencer, 31-Second silencer, 32-First silencer, 33-Negative pressure sensor, 34-Oil-water separator, 35-Third absolute pressure sensor, 36-Second absolute pressure sensor, 37-First absolute pressure sensor, 38-Third displacement sensor, 39-Second displacement sensor, 40-First displacement sensor, 41-Recording device. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0029] Please see Figures 1-2 As shown, this utility model provides an intelligent testing device for the life-cycle durability of a fuel tank, including an air compressor 1. The air compressor 1 is connected to a positive pressure tank 3 via a three-stage filter 2. The positive pressure tank 3 is equipped with a drain valve, a positive pressure tank safety valve 4, and a positive pressure tank pressure tester 5. The positive pressure tank 3 is connected to a first air filter 12 via a second interface. The first air filter 12 is connected to a first electro-proportional valve 15. The first electro-proportional valve 15 is connected to a first pilot solenoid valve 21. A first pressure sensor B18 is provided between the first electro-proportional valve 15 and the first pilot solenoid valve 21. The first pilot solenoid valve 21 is connected to a channel. First, the first channel is connected to the first absolute pressure sensor 37; the first channel is connected to the fourth pilot solenoid valve 24, the fourth pilot solenoid valve 24 is connected to the oil-water separator 34, the oil-water separator 34 is connected to the first interface of the negative pressure tank 6, the second interface of the negative pressure tank 6 is connected to the vacuum pump 9, the negative pressure tank 6 is equipped with a negative pressure tank safety valve 7 and a negative pressure tank pressure tester 8, a negative pressure sensor 33 is provided between the oil-water separator 34 and the first interface of the negative pressure tank 6, the first channel is connected to the first fuel tank under test, the first fuel tank under test is equipped with a first displacement sensor 40, the first channel is connected to the seventh pilot solenoid valve 27, and the seventh pilot solenoid valve 27 is connected to the first muffler 32.

[0030] The positive pressure tank 3 has its interface 2 connected to the second air filter 13, which is connected to the second electro-proportional valve 16. The second electro-proportional valve 16 is connected to the second pilot solenoid valve 22. A second pressure sensor B19 is provided between the second electro-proportional valve 16 and the second pilot solenoid valve 22. The second pilot solenoid valve 22 is connected to channel 2, which is connected to the second absolute pressure sensor 36. Channel 2 is connected to the eighth pilot solenoid valve 28, which is connected to the second muffler 31. Channel 2 is connected to the fifth pilot solenoid valve 25, which is connected to the oil-water separator 34. Channel 2 is connected to the fuel tank under test, which is equipped with a second displacement sensor 39.

[0031] The positive pressure tank 3 has its interface 2 connected to the third air filter 14, which is connected to the third electro-proportional valve 17. The third electro-proportional valve 17 is connected to the third pilot solenoid valve 23. A third pressure sensor B20 is provided between the third electro-proportional valve 17 and the third pilot solenoid valve 23. The third pilot solenoid valve 23 is connected to channel 3, which is connected to the third absolute pressure sensor 35. Channel 3 is connected to the ninth pilot solenoid valve 29, which is connected to the third muffler 30. Channel 3 is connected to the sixth pilot solenoid valve 26, which is connected to the oil-water separator 34. Channel 3 is connected to the fuel tank under test, which is equipped with a third displacement sensor 38.

[0032] The testing device also includes a PLC, which is connected to the first displacement sensor 40, the second displacement sensor 39, and the third displacement sensor 38. The PLC is also connected to a recording device 41. In addition, the PLC is connected to the aforementioned valves for remote control of opening and closing, enabling intelligent completion of the test. The interface two of the positive pressure tank 3 is connected to a triplet 10, which connects to all pilot solenoid valves. The triplet has nine interfaces (I1-I9), corresponding to nine pilot solenoid valves (numbered 21-29), namely the first pilot solenoid valve 21 to the ninth pilot solenoid valve 29. A pressure sensor A 11 is provided between the interface two of the positive pressure tank 3 and the first air filter 12.

[0033] In this embodiment, the positive pressure tank pressure tester 5 and the negative pressure tank pressure tester 8 are pressure gauges, the first displacement sensor 40, the second displacement sensor 39 and the third displacement sensor 38 are displacement spring self-resetting sensors, the recording device 41 is a paperless recorder, and the air compressor 1 is a screw air compressor.

[0034] Core advantages include: 1. Multi-mode testing capability: By switching between a positive pressure tank, a negative pressure tank, and a pilot solenoid valve, it can perform positive pressure durability tests, negative pressure durability tests, and positive and negative pressure alternating pulse tests, comprehensively simulating real working conditions. 2. Multi-station testing capability: The testing device has 3 outputs, each equipped with an independent electro-proportional valve and a pilot solenoid valve, providing three independent testing capabilities. 3. Rapid pressure rise and fall capability: The positive and negative pressure tanks store energy, and the pilot solenoid valve switches the output path, enabling rapid pressure rise and fall, improving the response frequency of pulse pressure alternating tests. 4. High-precision intelligent control: It adopts a two-level control system of computer and PLC, allowing users to set test parameters and automatically generate pressure-time curves, improving test accuracy and consistency. 5. Energy-saving optimized design: The positive and negative pressure tanks can be pre-stored with energy, reducing the frequent start-stop of the air compressor and vacuum pump, reducing energy consumption by more than 30%. 6. Data Traceability and Analysis: Equipped with an absolute pressure sensor and data acquisition module, it records the time-pressure curve in real time. It also features a displacement sensor and paperless recorder (displacement acquisition device) to output real-time graphs showing the minimum and maximum deformation at specific locations on the fuel tank. This data can be used for fuel tank durability analysis and lifespan prediction. In summary, compared to existing technologies, this device fills the gap in dynamic pressure testing of fuel tanks, improves testing efficiency, accuracy, and intelligence, and is suitable for fuel tank reliability verification in the automotive, aviation, and marine industries, demonstrating significant market application value.

[0035] To test the life-cycle durability performance of fuel tanks, this invention provides an intelligent testing device for the life-cycle durability performance of fuel tanks. This device not only possesses multi-station, multi-mode intelligent testing capabilities but also offers advantages such as data traceability and energy saving. The device includes a vacuum pump, a negative pressure tank, an air compressor, a positive pressure tank, a three-stage filter, a triplet unit, an air filter, pressure sensor A, pressure sensor B, a negative pressure sensor, an electro-proportional valve, a pilot solenoid valve, an oil-water separator, an absolute pressure sensor, a muffler, a displacement spring self-resetting sensor, a paperless recorder (displacement acquisition device), and an automated control system.

[0036] The vacuum pump and air compressor provide negative and positive pressure sources for the testing device. The negative and positive pressure tanks store energy, providing sufficient pressure and reducing frequent start-stop cycles of the air compressor and vacuum pump. The negative pressure sensor monitors the pressure in the vacuum tank. The three-stage filter filters the compressed air output from the air compressor and stores it in the storage tank. The oil-water separator filters moisture from the air in the vacuum circuit, preventing moisture from entering the vacuum pump. The triplet depressurizes and filters a small portion of the compressed air before outputting it, providing external pilot pressure for the pilot solenoid valve. Pressure sensor A monitors the pressure in the positive pressure storage tank. The air filter filters the compressed air in the positive pressure storage tank, ensuring the cleanliness of the gas entering the electro-proportional valve and preventing blockage. The electro-proportional valve automatically controls and adjusts the output pressure. Pressure sensor B detects the output pressure of the electro-proportional valve. The pilot solenoid valve controls the connection and disconnection of the positive and negative pressure circuits of the device; switching the pilot solenoid valve allows for positive and negative pressure outputs. The absolute pressure sensor is used to detect the real-time pressure value of the fuel tank under test. The muffler is used to reduce exhaust noise during device operation. The displacement spring self-resetting sensor is used to detect the deformation of the fuel tank. The paperless recorder (displacement acquisition device) is used to receive the signal fed back from the displacement sensor and output the corresponding deformation data. The automated control system includes a PLC, computer, etc., which can realize high-precision fully automatic control, automatic recording and data processing. It should be further noted that any other components used to achieve the above effects should fall within the inventive concept of this utility model and should be protected within the scope of this utility model.

[0037] Working principle:

[0038] Connect the fuel tank under test to the outlet of the testing device (channel one to channel three). Place the displacement spring self-resetting sensor 40 at the position on the fuel tank where the deformation needs to be tested. The paperless recorder (displacement acquisition device) 41 collects the displacement deformation data. Start the vacuum pump 9 to evacuate the vacuum tank 6, so that the vacuum tank 6 is in a negative pressure state. Start the air compressor 1 to fill the positive pressure tank 3 with air, so that the positive pressure tank 3 stores a certain amount of low-pressure compressed air.

[0039] During the positive pressure durability test, low-pressure compressed air enters from the positive pressure tank 3 through the air filter 12. The system automatically adjusts the output pressure via the electro-proportional valve 15, and outputs positive pressure to the fuel tank under test by opening the first pilot solenoid valve 21. After reaching the target pressure, the pressure is maintained for a certain period. Once the pressure is accepted, the seventh pilot solenoid valve 27 is activated to release the pressure in the fuel tank. The system output port records the real-time pressure value of the fuel tank through the first absolute pressure sensor 37. The above steps are repeated until the test is completed.

[0040] During the negative pressure durability test, the system opens the fourth pilot solenoid valve 24. After the fuel tank reaches the target test pressure, the fourth pilot solenoid valve 24 closes to enter the pressure holding state. After the pressure holding period ends, the seventh pilot solenoid valve 27 is opened to restore the normal pressure state. The system output port records the real-time pressure value of the fuel tank through the first absolute pressure sensor 37. The above steps are repeated until the test is completed.

[0041] During the pulse alternating pressure test, the pressure output is adjusted via the electro-proportional valve 15. The first pilot solenoid valve 21 is opened to raise the fuel tank pressure from atmospheric pressure to positive pressure. The first pilot solenoid valve 21 is then closed, and the fourth pilot solenoid valve 24 is opened to switch the fuel tank pressure from positive to negative pressure. The system output port records the real-time fuel tank pressure value via the first absolute pressure sensor 37. The above steps are repeated until the test is completed.

[0042] After the test is completed, the test data is saved and exported to evaluate and analyze the durability of the fuel tank throughout its entire life cycle.

[0043] The beneficial effects of this utility model are:

[0044] 1. This utility model achieves positive pressure durability test, negative pressure durability test, and positive and negative pressure alternating pulse test by switching between a positive pressure tank, a negative pressure tank, and a pilot solenoid valve, thus fully simulating real working conditions.

[0045] 2. This utility model uses negative pressure tanks and positive pressure tanks for energy storage, which reduces the frequent start-stop of air compressors and vacuum pumps, and reduces energy consumption by more than 30%.

[0046] 3. This utility model uses negative pressure tanks and positive pressure tanks for energy storage, and controls the output path by switching pilot solenoid valves to achieve rapid pressure rise or fall, thereby improving the response frequency of the device.

[0047] 4. This utility model adopts an electric proportional valve for pressure regulation. With the electric proportional valve, remote automatic control of pressure regulation by computer is realized, which has high control accuracy and good stability.

[0048] 5. This utility model has three independent testing channels and is capable of simultaneously conducting full life cycle tests on three fuel tanks.

[0049] 6. This utility model achieves high-precision intelligent control through two-level control via computer and PLC.

[0050] This invention employs an absolute pressure sensor, a data acquisition module, a displacement sensor, and a paperless recorder (displacement collector) to record time-pressure and time-displacement curves in real time, and displays the minimum and maximum deformation. It can be used for fuel tank durability analysis and life prediction.

[0051] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An intelligent testing device for the life-cycle durability of a fuel tank, characterized in that: Includes an air compressor (1), the air compressor (1) is connected to a positive pressure tank (3) via an interface one, the positive pressure tank (3) is provided with a positive pressure tank safety valve (4) and a positive pressure tank pressure tester (5), the positive pressure tank (3) via an interface two is connected to a first air filter (12), the first air filter (12) is connected to a first electro-proportional valve (15), the first electro-proportional valve (15) is connected to a first pilot solenoid valve (21), a first pressure sensor B (18) is provided between the first electro-proportional valve (15) and the first pilot solenoid valve (21), the first pilot solenoid valve (21) is connected to a channel one, the channel one is connected to a first absolute pressure sensor (37); The first channel is connected to the fourth pilot solenoid valve (24), the fourth pilot solenoid valve (24) is connected to the oil-water separator (34), the oil-water separator (34) is connected to the first interface of the negative pressure tank (6), the second interface of the negative pressure tank (6) is connected to the vacuum pump (9), the negative pressure tank (6) is equipped with a negative pressure tank safety valve (7) and a negative pressure tank pressure tester (8), and a negative pressure sensor (33) is provided between the first interface of the oil-water separator (34) and the negative pressure tank (6). The channel one is connected to the fuel tank one under test, the fuel tank one under test is equipped with a first displacement sensor (40), the testing device also includes a PLC, the PLC is connected to the first displacement sensor (40), and the PLC is connected to a recording device (41).

2. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The air compressor (1) is connected to the interface of the positive pressure tank (3) through a three-stage filter (2), and the positive pressure tank (3) is equipped with a drain valve.

3. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The interface two of the positive pressure tank (3) is connected to the triplet (10), the triplet (10) is connected to the first pilot solenoid valve (21) and the fourth pilot solenoid valve (24), and a pressure sensor A (11) is provided between the interface two of the positive pressure tank (3) and the first air filter (12).

4. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The channel is connected to the seventh pilot solenoid valve (27), and the seventh pilot solenoid valve (27) is connected to the first silencer (32).

5. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The positive pressure tank pressure tester (5) and the negative pressure tank pressure tester (8) are pressure gauges.

6. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The first displacement sensor (40) is a displacement spring self-resetting sensor, and the recording device (41) is a paperless recorder.

7. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The interface two of the positive pressure tank (3) is connected to the second air filter (13), the second air filter (13) is connected to the second electro-proportional valve (16), the second electro-proportional valve (16) is connected to the second pilot solenoid valve (22), a second pressure sensor B (19) is provided between the second electro-proportional valve (16) and the second pilot solenoid valve (22), the second pilot solenoid valve (22) is connected to channel two, the channel two is connected to the second absolute pressure sensor (36), the channel two is connected to the eighth pilot solenoid valve (28), the eighth pilot solenoid valve (28) is connected to the second muffler (31), the channel two is connected to the fifth pilot solenoid valve (25), the fifth pilot solenoid valve (25) is connected to the oil-water separator (34), the channel two is connected to the fuel tank under test, the fuel tank under test is provided with a second displacement sensor (39).

8. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The positive pressure tank (3) has its interface two connected to the third air filter (14), the third air filter (14) connected to the third electro-proportional valve (17), the third electro-proportional valve (17) connected to the third pilot solenoid valve (23), a third pressure sensor B (20) is provided between the third electro-proportional valve (17) and the third pilot solenoid valve (23), the third pilot solenoid valve (23) is connected to channel three, channel three is connected to the third absolute pressure sensor (35), channel three is connected to the ninth pilot solenoid valve (29), the ninth pilot solenoid valve (29) is connected to the third muffler (30), channel three is connected to the sixth pilot solenoid valve (26), the sixth pilot solenoid valve (26) is connected to the oil-water separator (34), channel three is connected to the fuel tank under test, and the fuel tank under test is provided with a third displacement sensor (38).

9. The intelligent testing device for the full life cycle durability of a fuel tank according to claim 1, characterized in that: The air compressor (1) is a screw air compressor.

Images