Engine cold-state performance test system

Abstract

The utility model belongs to the technical field of engine testing, and particularly relates to an engine cold-state performance testing system, the pipe diameter of a testing pipeline I is larger than that of a testing pipeline II, a wide-range flowmeter is used for detecting the flow of fuel oil flowing along the testing pipeline I, and a small-range flowmeter is used for detecting the flow of fuel oil flowing along the testing pipeline II; the number of the testing pipelines I and the number of the testing pipelines II are both two, the two testing pipelines I and the two testing pipelines II are both connected with the fuel oil supply unit, one testing pipeline I and one testing pipeline II are provided with power pumps, the two testing pipelines I and the two testing pipelines II are both provided with adjusting valves I, and the adjusting valves II are provided with adjusting valves II. And the tail ends of the two test pipelines I and the two test pipelines II are respectively provided with a connector for connecting an oil inlet of an engine. The long-time operation stability and reliability of the engine in the cold state under different flow working conditions can be tested, the testing precision is higher, and the range of engine types suitable for being tested is wider.

Description

Technical Field

[0001] This utility model belongs to the field of engine testing technology, specifically relating to an engine cold-state performance testing system. Background Art

[0002] Engines are the primary power source for missiles and near-space vehicles, and their performance directly determines the performance and safety of these vehicles. Based on the issues involved in the actual operation of engines, corresponding cold-state ground tests are required during the production process to verify whether the design parameters of each engine meet the expected design goals and to validate its reliability and stability. For engines using fuel (liquid fuel), pump tests are necessary to verify their stability and reliability under long-term cold-state operation, as well as the matching of expected and actual flow rates under different fuel flow conditions. Currently, existing testing systems generally deliver fuel at different flow rates to the engine through the same pipeline. However, to accommodate the delivery requirements of varying fuel flow rates, the pipeline diameter needs to be set relatively large. But during matching tests under low flow conditions, the excessively large pipeline diameter can lead to a slow fuel flow rate, affecting the accuracy of flow measurement and resulting in errors in the final results. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an engine cold performance test system that can test the long-term stability and reliability of an engine under different flow conditions in a cold state, with higher testing accuracy and a wider range of applicable engine types.

[0004] This utility model includes a testing unit and a fuel supply unit. The testing unit includes a test pipeline I, a test pipeline II, a large-range flow meter, and a small-range flow meter. The diameter of test pipeline I is larger than that of test pipeline II. The large-range flow meter is used to detect the fuel flow rate along test pipeline I, and the small-range flow meter is used to detect the fuel flow rate along test pipeline II. There are two test pipelines I and two test pipelines II, and both test pipelines I and II are connected to the fuel supply unit. A power pump is installed on one of the test pipelines I and one of the test pipelines II. A regulating valve I is installed on both test pipelines I and both test pipelines II, and an interface for connecting to the engine fuel inlet is provided at the end of both test pipelines I and both test pipelines II.

[0005] Furthermore, the test unit also includes a vacuum pumping device for evacuating the engine flow path, which is connected to two test lines I and two test lines II.

[0006] Furthermore, the test unit also includes an air source I for purging the engine flow path, the air source I being connected to two test lines I and two test lines II.

[0007] Furthermore, the test unit also includes a three-way valve. The vacuum pump and the gas source I are connected to two ends of the three-way valve, and the other end of the three-way valve is connected to two test pipelines I and two test pipelines II through four pipelines. The connection is located in the area between the regulating valve I and the interface. Each of the four pipelines is equipped with a regulating valve II, and the regulating valve I of the test pipelines I and II equipped with the power pump is located between the power pump and the interface.

[0008] Furthermore, an oil mist separator is installed on the pipeline connecting the vacuum device and the three-way valve.

[0009] Furthermore, the fuel supply unit includes a fuel tank and an air source II connected to the fuel tank. The air source II is used to pressurize the inside of the fuel tank. Two test lines I and two test lines II are connected to the bottom of the fuel tank, and a regulating valve IV is provided at the bottom of the fuel tank.

[0010] Furthermore, the fuel supply unit also includes a pressure reducing valve, a pressure sensing unit, and a shut-off valve II. The pressure reducing valve, pressure sensing unit, and shut-off valve II are all located between the pressure sensing unit and the fuel tank and are installed on the pipeline connecting the gas source II to the fuel tank. The pressure reducing valve is used to reduce the gas pressure output by the gas source II, and the pressure sensing unit is used to detect the gas pressure output along the pressure reducing valve.

[0011] Furthermore, the fuel supply unit also includes an exhaust valve and a muffler. The exhaust valve is connected to the fuel tank and is used to discharge gas from the fuel tank after engine testing. The muffler is located at the outlet end of the exhaust valve.

[0012] Furthermore, it also includes an oil return unit, which includes an oil receiving tank, an oil return reservoir, an oil filter, and an oil quality detector. The oil receiving tank is used to receive fuel injected along the engine. The oil return reservoir is connected to the oil receiving tank and to the fuel reservoir in the fuel supply unit. The oil filter is used to filter the fuel in the oil return reservoir. The oil quality detector is used to detect the cleanliness of the fuel filtered by the oil filter.

[0013] Furthermore, the test unit is provided in two or more parts, the two or more test units have the same structure and are connected to the same fuel supply unit, and the number of oil receiving tanks in the oil return unit is the same as the number of test units.

[0014] The beneficial effects of this invention are that it can not only be used to test the long-term operational stability and reliability of engines under different flow conditions in a cold state, but also, by setting up test pipelines I and II with different diameters to perform matching tests under high and low flow conditions, the fuel flow rate is more closely matched with the diameter of the test pipeline in which it flows during testing. This makes the fuel flow rate more stable under both high and low flow conditions, avoiding the problem of decreased measurement accuracy due to excessively slow fuel flow rate, thus improving measurement accuracy and the accuracy of test results. The setting of regulating valve I not only allows other test pipelines to be kept closed when the target test pipeline is in use, but also allows adjustment of the specific flow capacity of the target test pipeline within a certain range, improving the flexibility and compatibility of the test. Furthermore, by setting up test pipelines I and II with and without a power pump, matching tests can be performed on engines without a fuel pump and engines with a fuel pump under both high and low flow conditions. This avoids the power pump increasing the pipe resistance of the test pipeline for engines with their own fuel pumps, thus broadening the range of applicable engine types while ensuring test accuracy. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the engine cold performance testing system of this utility model.

[0016] Figure 2 This is a schematic diagram of the test unit of this utility model.

[0017] Figure 3 This is a schematic diagram of the fuel supply unit of this utility model.

[0018] Figure 4 This is a schematic diagram of the oil return unit of this utility model.

[0019] In the diagram: 100, Test Unit; 1, Test Pipeline I; 2, Test Pipeline II; 3, Large Range Flow Meter; 4, Small Range Flow Meter; 5, Power Pump; 6, Control Valve I; 7, Interface; 8, Vacuum Device; 9, Air Source I; 10, Three-Way Valve; 11, Oil Mist Separator; 12, Control Valve II; 13, Control Valve III; 14, Filter I;

[0020] 200. Fuel supply unit; 15. Fuel tank; 16. Regulating valve IV; 17. Gas source II; 18. Shut-off valve I; 19. Pressure reducing valve; 20. Pressure sensing unit; 21. Shut-off valve II; 22. Exhaust valve; 23. Silencer; 24. Safety valve;

[0021] 300. Oil return unit; 25. Oil receiving drum; 26. Oil return storage tank; 27. Oil filter; 28. Oil quality detector; 29. ​​Oil return pump; 30. Filter II; 31. Shut-off valve III; 32. Shut-off valve IV; 33. Shut-off valve V. Detailed Implementation

[0022] like Figures 1-4 As shown, this utility model provides an engine cold-state performance testing system, including a testing unit 100 and a fuel supply unit 200. The testing unit 100 includes a test pipeline I1, a test pipeline II2, a large-range flow meter 3, and a small-range flow meter 4. The diameter of test pipeline I1 is larger than that of test pipeline II2, and the fuel flow rate that can flow through test pipeline I1 is greater than that of test pipeline II2. The large-range flow meter 3 and the small-range flow meter 4 are two flow meters with different measurable ranges. The large-range flow meter 3 has a larger measuring range than the small-range flow meter 4. The large-range flow meter 3 is used to detect the fuel flow rate along test pipeline I1, and the small-range flow meter 4 is used to detect the fuel flow rate along test pipeline II2. Both test lines I1 and II2 have two lines, each connected to the fuel supply unit 200. One test line I1 and one test line II2 are equipped with a power pump 5, while the other test line I1 and the other test line II2 are not equipped with a power pump 5. The pumping capacity of the power pump 5 on test line I1 corresponds to the flow capacity of test line I1, and the pumping capacity of the power pump 5 on test line II2 corresponds to the flow capacity of test line II2. Each of the two test lines I1 and two test lines II2 is equipped with a regulating valve I6, the flow capacity of which corresponds to the flow capacity of the test line to which it is located at its maximum opening. The ends of each of the two test lines I1 and two test lines II2 are equipped with interfaces 7 for connecting to the engine fuel inlet. These four interfaces 7 are located on one side of the test station where the engine is placed. The interface 7, which is equipped with test line I1 and test line II2 of power pump 5, is used for testing engines that do not have their own fuel pump. The interface 7, which is not equipped with test line I1 and test line II2 of power pump 5, is used for testing engines that have their own fuel pump.

[0023] When testing the compatibility of engines without a built-in fuel pump under high-flow conditions, the interface 7 of test line I1, equipped with a power pump 5, is connected to the engine's fuel inlet. A large flow of fuel is introduced along test line I1, and the power pump 5 provides power for the fuel flow. The actual fuel flow rate is read by a large-range flow meter 3. When testing the compatibility of engines without a built-in fuel pump under low-flow conditions, the interface 7 of test line II2, equipped with a power pump 5, is connected to the engine's fuel inlet. A small flow of fuel is introduced along test line II2, and the power pump 5 provides power for the fuel flow. The actual fuel flow rate is read by a small-range flow meter 4.

[0024] When testing the compatibility of engines with built-in fuel pumps under high-flow conditions, the interface 7 of test line I1 (without power pump 5) is connected to the engine's fuel inlet. A large flow of fuel is introduced through test line I1, and the engine's built-in fuel pump provides power for the fuel flow. The actual fuel flow rate is read by a large-range flow meter 3. When testing the compatibility of engines without built-in fuel pumps under low-flow conditions, the interface 7 of test line II2 (without power pump 5) is connected to the engine's fuel inlet. A small flow of fuel is introduced through test line II2, and the engine's built-in fuel pump provides power for the fuel flow. The actual fuel flow rate is read by a small-range flow meter 4.

[0025] The engine cold-state performance testing system provided by this utility model can not only be used to test the long-term operational stability and reliability of an engine under different flow conditions in a cold state, but also, by setting up test pipes I1 and II2 with different diameters to perform matching tests under high and low flow conditions, the fuel flow rate is more closely matched with the diameter of the test pipe in which it flows during testing. This makes the fuel flow rate more stable under both high and low flow conditions, avoiding the problem of decreased measurement accuracy due to excessively slow fuel flow rate, and improving the accuracy of measurement and test results. The setting of regulating valve I6 can not only keep other test pipes closed when the target test pipe is in use, but also adjust the specific flow capacity of the target test pipe within a certain range, improving the flexibility and compatibility of the test. Furthermore, by setting up test lines I1 with a power pump 5 and test lines II2 without a power pump 5, it is possible to perform matching tests on engines without a fuel pump and engines with a fuel pump under different flow conditions. This avoids the power pump 5 increasing the pipe resistance of the test lines for engines with their own fuel pumps, thus expanding the range of engine types that can be tested while ensuring test accuracy.

[0026] The test unit 100 also includes a vacuum pumping device 8, which is connected to two test lines I1 and two test lines II2. The vacuum pumping device 8 is used to evacuate the engine flow path before testing to prevent external gases from entering the engine flow path and affecting the stability of the test. The vacuum pumping device 8 can be a vacuum pump or other mechanism.

[0027] The test unit 100 also includes an air source I9, which is an air supply unit and can be an air compressor or an air tank. The air source I9 is ​​connected to two test lines I1 and two test lines II2 to purge the engine flow passage and maintain a certain level of cleanliness in the engine flow passage.

[0028] The test unit 100 also includes a three-way valve 10. The vacuuming device 8 and the air source I 9 are connected to two ends of the three-way valve 10. The other end of the three-way valve 10 is connected to two test pipelines I 1 and two test pipelines II 2 via four pipelines. The connection points are located in the area between the regulating valve I 6 and the interface 7. The regulating valve I 6 of the test pipelines I 1 and II 2, which are equipped with the power pump 5, is located between the power pump 5 and the interface 7. Based on this configuration, the vacuuming device 8 and the air source I 9 can perform vacuuming and purging of the engine through a shared pipeline. During vacuuming, the end of the three-way valve 10 connected to the air source I 9 remains closed, and the regulating valve I 6 remains closed. During purging, the end of the three-way valve 10 connected to the vacuuming device 8 remains closed, and the regulating valve I 6 remains closed, thereby avoiding any impact on the power pump 5 during vacuuming and purging. All four pipelines mentioned above are equipped with regulating valves II12. When vacuuming or purging is performed, the regulating valves II12 on the pipeline in use are opened, while the regulating valves II12 on other pipelines remain closed. The intensity of vacuuming and purging can be adjusted by regulating the opening degree of the regulating valves II12.

[0029] An oil mist separator 11 is installed on the pipeline connecting the vacuum device 8 and the three-way valve 10 to prevent the vacuum device 8 from being contaminated by fuel.

[0030] The fuel supply unit 200 includes a fuel storage tank 15 and an air source II 17 connected to the fuel storage tank 15. The air source II 17 is an air compressor or a high-pressure gas tank. The air source II 17 is used to pressurize the inside of the fuel storage tank 15, providing driving force for the fuel inside the fuel storage tank 15. Compared with the pumping method, providing air source II 17 increases the delivery cost and is simple to control. The two test lines I 1 and the two test lines II 2 are specifically connected to the bottom of the fuel storage tank 15, and a regulating valve IV 16 is provided at the bottom of the fuel storage tank 15 for switching on and off at the bottom of the fuel storage tank 15 and for regulating the fuel supply flow.

[0031] The regulating valve IV16 is connected to the fuel supply main pipe. The bottom of the fuel tank 15 is connected to two test lines I1 and two test lines II2 through the fuel supply main pipe. A regulating valve III13 is installed at one end of the fuel supply main pipe near the two test lines I1 and two test lines II2 to control the on / off of the fuel inlet of the test unit 100. A filter I14 is also installed on the fuel supply main pipe. The filter I14 is located between the regulating valve III13 and the regulating valve IV16 on the fuel supply main pipe to filter the fuel and ensure the cleanliness of the fuel when it enters the test unit 100.

[0032] In one configuration of this utility model, a large-range flow meter 3 is installed on each of the two test pipelines I1, and a small-range flow meter 4 is installed on each of the two test pipelines II2.

[0033] In another configuration of this utility model, two test pipelines I1 share a single large-range flow meter 3. The two test pipelines I1 are connected to the main oil supply pipe via a branch oil supply pipe, and the large-range flow meter 3 is installed on this branch oil supply pipe. Two test pipelines II2 share a single small-range flow meter 4. The two test pipelines II2 are connected to the main oil supply pipe via a branch oil supply pipe, and the small-range flow meter 4 is installed on this branch oil supply pipe. After the test is completed,

[0034] The fuel supply unit 200 also includes a pressure reducing valve 19 and a pressure sensing unit 20. The pressure reducing valve 19 and pressure sensing unit 20 are installed on the pipeline connecting the gas source II 17 to the fuel storage tank 15. The pressure reducing valve 19 reduces the gas pressure output from the gas source II 17, ensuring that the output gas pressure meets the pressurization requirements inside the fuel storage tank 15, thereby improving the reliability and stability of the fuel supply. The pressure sensing unit 20 detects the gas pressure output along the pressure reducing valve 19 in the pipeline; it can be a pressure sensor or a pressure gauge.

[0035] The gas outlet of gas source II 17 is equipped with a shut-off valve I 18 to control the opening and closing of the gas outlet. A shut-off valve II 21 is also installed on the pipeline connecting gas source II 17 to fuel tank 15. Shut-off valve II 21 is located between pressure sensing unit 20 and fuel tank 15 and is used to close the pipeline when the gas pressure output along pressure reducing valve 19 does not meet requirements. For example, during normal testing, shut-off valve II 21 remains open. When pressure sensing unit 20 detects that the gas pressure output along pressure reducing valve 19 is higher than a preset safety pressure, shut-off valve II 21 closes to prevent excessive gas pressure in fuel tank 15 from causing safety issues and improve the stability and reliability of the test system. A safety valve 24 is also installed on fuel tank 15 to release pressure when the pressure in fuel tank 15 is too high, further improving the stability and reliability of the test system.

[0036] The fuel supply unit 200 also includes an exhaust valve 22 and a muffler 23. The exhaust valve 22 is connected to the fuel tank 15, and can also be set on the pipeline connecting the gas source II 17 to the fuel tank 15, and located between the shut-off valve II 21 and the fuel tank 15. The exhaust valve 22 is used to discharge the gas in the fuel tank 15 after engine testing to release excess pressure in the fuel tank 15. The muffler 23 is set at the outlet end of the exhaust valve 22 and is used to mute the exhaust and reduce noise.

[0037] The engine cold-state performance testing system provided by this utility model also includes an oil return unit 300, which includes an oil receiving tank 25, an oil return storage tank 26, an oil filter 27, and an oil quality detector 28. The oil receiving tank 25 is used to collect fuel injected from the engine. Since the engine's fuel outlet is annular, the oil receiving tank 25 has a simple structure and can better collect the engine's fuel output. The oil return storage tank 26 is connected to the oil receiving tank 25 and to the fuel storage tank 15 in the fuel supply unit 200. The oil return storage tank 26 is used to temporarily store the fuel injected from the engine before the test ends, preventing the recovered fuel from flowing directly into the fuel storage tank 15 during the test and affecting its stability. After the test, the fuel temporarily stored in the oil return storage tank 26 flows into the fuel storage tank 15. In one embodiment of this utility model, the fuel in the oil receiving tank 25 flows directly into the oil return storage tank 26 by gravity. In the preferred embodiment of this invention, a return oil pump 29 is installed on the pipeline connecting the receiving tank 25 and the return oil storage tank 26. This pump drives the recovered fuel into the return oil storage tank 26, preventing the receiving tank 25 from overflowing due to excessive fuel accumulation during prolonged testing. This ensures the speed and efficiency of fuel recovery and improves the stability and reliability of the testing system. A filter II 30 is also installed on the pipeline connecting the receiving tank 25 and the return oil storage tank 26 for primary filtration of the recovered fuel.

[0038] The oil filter 27 is used to filter the fuel in the return oil storage tank 26, and the oil quality detector 28 is used to detect the fuel filtered by the oil filter 27. Specifically, as... Figure 1 and Figure 4As shown, the return oil storage tank 26 is connected to the fuel storage tank 15 via the oil outlet main pipe. A shut-off valve III 31 is installed on the oil outlet main pipe. The oil filter 27 is installed on the oil outlet main pipe and located between the return oil storage tank 26 and the shut-off valve III 31. The return oil storage tank 26 is also connected to the oil quality detector 28 via a return oil branch pipe. A shut-off valve V 33 is installed on the return oil branch pipe. The return oil branch pipe is connected to the oil outlet main pipe via an oil outlet branch pipe. The connection between the oil outlet branch pipe and the return oil branch pipe is located between the return oil storage tank 26 and the shut-off valve V 33. The connection between the oil outlet branch pipe and the oil supply main pipe is located between the oil filter 27 and the shut-off valve III 31. A shut-off valve IV 32 is installed on the oil outlet branch pipe. Based on this setup, after the test, first open shut-off valve IV 32. The fuel in the return oil storage tank 26 is filtered by the oil filter 27. Then, open shut-off valve V 33. The filtered fuel flows to the fuel quality detector 28 for testing. If the tested fuel cleanliness meets the requirements, close shut-off valves IV 32 and V 33, and open shut-off valve III 31. The filtered fuel flows into the fuel storage tank 15. If the tested fuel cleanliness does not meet the requirements, close shut-off valve V 33. The filtered fuel flows back to the return oil storage tank 26 along the return oil branch pipe for secondary filtration until the fuel cleanliness meets the requirements. The fuel flow from the return oil storage tank 26 can be achieved by gravity alone, or by using a pump on the main outlet pipe. This pump can be located on the main outlet pipe between the return oil storage tank 26 and the oil filter 27, or between the oil filter 27 and the outlet branch pipe. After the fuel flows to the fuel quality detector 28, it can be directly entered into the fuel quality detector 28 for testing, or the fuel can be manually collected in a container and sent into the fuel quality detector 28 for testing.

[0039] In this invention, it is preferable to have two or more test units 100 to test two or more engines simultaneously. The two or more test units 100 have the same structure and are connected to the same fuel supply unit 200, that is, the two or more test units 100 are supplied with fuel through the same fuel supply unit 200. The number of oil receiving tanks 25 in the oil return unit 300 is the same as the number of test units 100, that is, the oil receiving tanks 25 in the oil return unit 300 are used one-to-one with each test unit 100, and the other mechanisms are shared.

[0040] This utility model also includes a control system, in which a large-range flow meter 3, a small-range flow meter 4, a vacuum device 8, a pressure sensing unit 20, an oil filter 27, an oil detector 28, and all the aforementioned pumps and valves are electrically connected to the control system.

[0041] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0042] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. An engine cold-state performance testing system, characterized in that, The test unit (100) includes a test unit (100) and a fuel supply unit (200). The test unit (100) includes a test pipeline I (1), a test pipeline II (2), a large-range flow meter (3), and a small-range flow meter (4). The diameter of the test pipeline I (1) is larger than the diameter of the test pipeline II (2). The large-range flow meter (3) is used to detect the fuel flow along the test pipeline I (1), and the small-range flow meter (4) is used to detect the fuel flow along the test pipeline II (2). Both test lines I (1) and II (2) have two lines. Both test lines I (1) and II (2) are connected to the fuel supply unit (200). One test line I (1) and one test line II (2) are equipped with a power pump (5). Both test lines I (1) and II (2) are equipped with a regulating valve I (6). Both test lines I (1) and II (2) are equipped with an interface (7) for connecting to the engine oil inlet.

2. The engine cold-state performance testing system as described in claim 1, characterized in that, The test unit (100) also includes a vacuum pumping device (8) for evacuating the engine flow channel, which is connected to two test lines I (1) and two test lines II (2).

3. The engine cold-state performance testing system as described in claim 2, characterized in that, The test unit (100) also includes an air source I (9) for blowing out the engine flow path, the air source I (9) being connected to two test lines I (1) and two test lines II (2).

4. The engine cold-state performance testing system as described in claim 3, characterized in that, The test unit (100) also includes a three-way valve (10). The vacuum device (8) and the gas source I (9) are connected to two ends of the three-way valve (10). The other end of the three-way valve (10) is connected to two test pipelines I (1) and two test pipelines II (2) through four pipelines. The connection is located in the area between the regulating valve I (6) and the interface (7). Each of the four pipelines is equipped with a regulating valve II (12). The regulating valve I (6) of the test pipelines I (1) and II (2) equipped with the power pump (5) is located between the power pump (5) and the interface (7).

5. The engine cold-state performance testing system as described in claim 4, characterized in that, An oil mist separator (11) is installed on the pipeline connecting the vacuum device (8) and the three-way valve (10).

6. The engine cold-state performance testing system as described in any one of claims 1-4, characterized in that, The fuel supply unit (200) includes a fuel tank (15) and an air source II (17) connected to the fuel tank (15). The air source II (17) is used to pressurize the inside of the fuel tank (15). Two test lines I (1) and two test lines II (2) are connected to the bottom of the fuel tank (15), and a regulating valve IV (16) is provided at the bottom of the fuel tank (15).

7. The engine cold-state performance testing system as described in claim 6, characterized in that, The fuel supply unit (200) also includes a pressure reducing valve (19), a pressure sensing unit (20), and a shut-off valve II (21). The pressure reducing valve (19), the pressure sensing unit (20), and the shut-off valve II (21) are located between the pressure sensing unit (20) and the fuel tank (15) and are all installed on the pipeline connecting the gas source II (17) to the fuel tank (15). The pressure reducing valve (19) is used to reduce the gas pressure output by the gas source II (17), and the pressure sensing unit (20) is used to detect the gas pressure output along the pressure reducing valve (19).

8. The engine cold-state performance testing system as described in claim 6, characterized in that, The fuel supply unit (200) also includes an exhaust valve (22) and a muffler (23). The exhaust valve (22) is connected to the fuel tank (15) and is used to discharge the gas in the fuel tank (15) after engine testing. The muffler (23) is located at the outlet end of the exhaust valve (22).

9. The engine cold-state performance testing system as described in any one of claims 1-4, 7, and 8, characterized in that, It also includes a return oil unit (300), which includes an oil receiving tank (25), a return oil storage tank (26), an oil filter (27), and an oil quality detector (28). The oil receiving tank (25) is used to receive fuel sprayed along the engine. The return oil storage tank (26) is connected to the oil receiving tank (25) and to the fuel storage tank (15) in the fuel supply unit (200). The oil filter (27) is used to filter the fuel in the return oil storage tank (26). The oil quality detector (28) is used to detect the fuel filtered by the oil filter (27).

10. The engine cold-state performance testing system as described in claim 9, characterized in that, The test unit (100) is provided in two or more, and the two or more test units (100) have the same structure and are connected to the same fuel supply unit (200). The number of oil receiving tanks (25) in the oil return unit (300) is the same as the number of test units (100).

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