New energy vehicle heat pump test system and test method

Abstract

The present invention discloses a new energy vehicle heat pump test system, including a test bench, a liquid storage device, a pumping device, a filling device, a heat pump fixing device and a judgment module. The new energy vehicle heat pump test system is used to test the heat pump, and can quickly fill the thermal management heat pump with test liquid and exhaust. The present invention also discloses a new energy vehicle heat pump test method, which can quickly test whether there is trapped air in the heat pump by calculating the difference between the volume of the test liquid in the heat pump and the volume of the maximum liquid level setting value in the heat pump.

Description

Technical Field

[0001] The present invention belongs to the field of new energy vehicles, and in particular relates to a new energy vehicle heat pump testing system and a testing method. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional automotive fuels as a power source, especially pure electric vehicles. Pure electric vehicles have the characteristics of energy saving and emission reduction during use. With the development and utilization of new energy, pure electric vehicles are gradually becoming popular. However, the frequent charging and discharging of pure electric vehicles will cause the capacity of their batteries to decay. At the same time, pure electric vehicles do not have internal combustion engines to provide heat sources. The passenger compartment of pure electric vehicles requires additional power from the battery when cooling or heating, and electricity is also needed to replenish the battery heat in low temperature environments, which greatly affects the range of pure electric vehicles. Therefore, the thermal management system of new energy vehicles has an important impact on the range of pure electric vehicles, battery temperature control, and passenger compartment comfort.

[0003] The main technical solution at present is to integrate various heat generating, heat consuming and cooling components in the vehicle into a central module for management. The most common method is to integrate them into a traditional heat pump. The heat pump is equipped with air conditioning circuit components such as water pump and water valve on the water side, electronic expansion valve on the refrigerant side, heat exchanger and condenser. Due to the complex cooling and heating mode, the manifold routing in the heat pump is complicated and the heat pump may be trapped when filling. Designers cannot quickly evaluate whether the design of the manifold and pump valve components in the heat pump is reasonable. Summary of the invention

[0004] In order to solve the above-mentioned shortcomings, the present invention provides a new energy vehicle heat pump testing system and testing method, which can quickly detect whether there is air trapping in the heat pump, and then determine whether the heat pump design is reasonable.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows: According to one aspect of the present invention, the applicant provides a new energy vehicle heat pump testing system, which includes: a test bench; a liquid storage device, at least partially connected to the test bench, for storing test liquid; a pumping device, at least partially connected to the test bench and connected to the liquid storage device, for pumping the test liquid and measuring the pumped test liquid; a filling device, at least partially connected to the test bench and connected to the pumping device, for pumping the test liquid to the heat pump and obtaining the liquid level in the heat pump; a heat pump fixing device, arranged below the filling device, for fixing the heat pump to be tested; a judgment module, connected to the pumping device and the filling device, for judging whether there is air trapping in the heat pump.

[0006] Furthermore, when the filling device pumps the test liquid to the maximum set value in the heat pump, the judgment module determines whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum set value in the heat pump is within the allowable error range. If it is judged to be yes, there is no air entrapment phenomenon in the heat pump.

[0007] Further, if the judgment is no, the heat pump is vented until the liquid level drops to the minimum setting value of the heat pump, and when the test liquid is pumped into the heat pump again to the maximum setting value in the heat pump, the judgment module again judges whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum setting value in the heat pump is within the allowable error range;

[0008] Until the error is within the allowable range or the liquid level in the heat pump does not drop during the exhaust treatment, when the liquid level in the heat pump does not drop during the exhaust treatment, it is determined that there is air trapping in the heat pump.

[0009] Furthermore, the filling device includes: a slide, at least partially connected to the frame; a bracket, at least partially connected to the slide and movable along the slide; a liquid filling module, arranged on the bracket and connected to the pumping device, for filling the test liquid into the heat pump; a liquid level detection module, at least partially connected to the bracket, for obtaining the liquid level in the heat pump.

[0010] Furthermore, the liquid adding module includes: a liquid inlet connected to the pumping device; a first cavity, one end of which is connected to the liquid inlet for conveying the test liquid; and a liquid outlet connected to the other end of the first cavity for outputting the test liquid.

[0011] Furthermore, the liquid adding module also includes a second cavity, which extends substantially along the first direction, and both ends of the second cavity are connected to the outside.

[0012] Furthermore, the liquid level testing module includes: a testing block disposed in the second cavity, and the testing block can move in the second cavity along a first direction; and a testing sensor connected to the bracket for testing the position of the testing block.

[0013] Furthermore, the liquid storage device comprises: a liquid storage portion for storing the test liquid; a liquid filling port for adding the test liquid into the liquid storage portion; and a liquid level detection portion for detecting the liquid level in the liquid storage portion.

[0014] Another aspect of the present invention provides a new energy vehicle heat pump testing method, comprising the following steps:

[0015] Inject the test fluid into the heat pump to the maximum setting value of the heat pump;

[0016] Determine whether the difference between the volume of the injected test fluid and the volume of the maximum setting value of the heat pump is within the error range;

[0017] If it is judged that the difference between the volume of the injected test liquid and the volume of the maximum setting value of the heat pump is within the error range, if it is judged that it is, the test is terminated and it is judged that there is no trapped air phenomenon in the heat pump;

[0018] If it is determined that the difference between the volume of the injected test liquid and the volume of the maximum setting value of the heat pump exceeds the error range, the heat pump is vented until the liquid level drops to the minimum setting value of the heat pump;

[0019] When the test liquid is pumped into the heat pump again to the maximum set value in the heat pump, it is determined whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum set value in the heat pump is within the allowable error range;

[0020] If not, perform the above steps again until the error is within the allowable range or the liquid level in the heat pump does not drop during the exhaust process. When the liquid level in the heat pump does not drop during the exhaust process, it is determined that there is air trapping in the heat pump.

[0021] Furthermore, during the exhaust treatment, a pumping device in the heat pump is started to discharge the gas in the manifold loop of the heat pump.

[0022] The new energy vehicle heat pump test system provided by the present invention adopts a pumping device and a filling device with multiple through holes. The present invention effectively solves the technical problem of slow filling and exhaust speed of the heat pump in the prior art, thereby improving the test efficiency. The new energy vehicle heat pump test method provided by the present invention determines whether there is air entrapment in the internal pipeline of the heat pump by comparing the volume of the added test liquid with the rated capacity of the heat pump, solves the problem of difficulty in detecting the internal design of the heat pump, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A structural schematic diagram of a new energy vehicle heat pump test system in this application;

[0024] Figure 2 A schematic diagram of the structure of the liquid storage device in this application;

[0025] Figure 3 A schematic diagram of the filling device structure in this application;

[0026] Figure 4 A structural schematic diagram of a cross section of the filling module and the test block in this application;

[0027] Figure 5 A logical connection diagram of the test sensor, the judgment module and the pumping device in this application;

[0028] Figure 6 This is a flow chart of the new energy vehicle heat pump testing method in this application. DETAILED DESCRIPTION

[0029] In order to make those skilled in the art better understand the scheme of the present invention, the technical scheme in the specific implementation of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation of the present invention. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0030] like Figure 1 As shown, the present application provides a new energy vehicle heat pump test system 100, which includes a test bench 11, a pumping device 12, a liquid storage device 13, a filling device 14, a heat pump fixing device 15 and a judgment module 16. In order to clearly illustrate the technical solution of the present application, the following is also defined: Figure 1 Above, below, left, right, front, and back shown. Specifically, the stand 11 is used to carry a liquid storage device 13, a pumping device 12, a filling device 14 and a judgment module 16; the liquid storage device 13 is arranged at the upper end of the stand 11, and is used to store the test liquid required by the storage system; the pumping device 12 can be arranged on one side of the stand 11, the pumping device 12 is at least partially connected to the liquid storage device 13, and the pumping device 12 is at least partially connected to the filling device 14, and the pumping device 12 can pump the test liquid stored in the liquid storage device 13 to the filling device 14; the filling device 14 can be arranged on the front side of the stand 11, and the filling device 14 is connected to the pumping device 12, and the test liquid pumped by the pumping device 12 can be filled into the component to be tested; the heat pump fixing device 15 is arranged below the filling device 14, and is used to fix the heat pump to be tested; the judgment module 16 is at least partially connected to the pumping device 12, and the judgment module 16 is at least partially connected to the filling device 14, and the judgment module 16 is used to judge whether there is air entrapment in the heat pump.

[0031] As an implementation method, Figure 1 As shown, the stand 11 includes a first bearing portion 111, a second bearing portion 112 and a side bearing portion 113. The first bearing portion 111 is located at the upper end of the stand 11, and is used to bear the liquid storage device 13. The first bearing portion 111 also includes an anti-skid fixed wing 1111, which is arranged at the top edge of the stand 11 to prevent the liquid storage device 13 from tilting during the experiment; the second bearing portion 112 is used to bear the pumping device 12, and the second bearing portion 112 can be arranged lower than the first bearing portion 111. Under this design, the test liquid in the liquid storage device 13 can better enter the pumping device 12; the side bearing portion 113 is arranged on the side of the stand 11 close to the pumping device 12, and is used to bear the filling device 14. The side bearing portion 113 can also ensure the stability of the stand 11.

[0032] As an implementation method, Figure 1As shown, a part of the pumping device 12 is connected to the liquid storage device 13, and a part of the pumping device 12 is also connected to the filling device 14. Specifically, the pumping device 12 and the liquid storage device 13 can be connected by a pipeline, and the pumping device 12 and the filling device 14 can be connected by a pipeline, and the pumping device 12 can pump the liquid stored in the liquid storage device 13 to the filling device 14. Further, the pumping device 12 can use a peristaltic pump. The peristaltic pump causes the test liquid in the pump tube to flow by alternately squeezing and releasing the pump tube, thereby forming a negative pressure at the inlet end of the pump tube, and the test liquid in the liquid storage device 13 is drawn into the inlet end of the pump tube, and the test liquid squeezed by the pump tube will flow out of the outlet end of the pump tube. The pumping device in the present invention adopts a peristaltic pump. During the process of the peristaltic pump pumping the test liquid, the test liquid will not produce or infiltrate gas to affect the test results. At the same time, the volume of the test liquid pumped out by the peristaltic pump remains unchanged every time the peristaltic pump used in the present invention rotates one circle, and the volume accuracy of the test liquid discharged by the peristaltic pump can reach up to 0.5 thousandths, which greatly improves the accuracy of the present invention in calculating the volume of the test liquid.

[0033] As an implementation method, Figure 2 As shown, the liquid storage device 13 includes a liquid adding port 131, a liquid storage portion 132, a liquid level detection portion 133 and a first liquid outlet 134. The liquid adding port 131 is disposed at the upper end of the liquid storage device 13, and the liquid adding port 131 is connected to the liquid storage portion 132. The liquid adding port 131 can be used to add test liquid to the liquid storage device 13. The liquid storage portion 132 is used to store the test liquid, and the liquid storage portion 132 can select corresponding materials according to the properties of different test liquids. The liquid level detection portion 133 is used to determine the liquid level of the test liquid in the liquid storage device 13. Specifically, the liquid level detection portion 133 can be a float level gauge or a magnetic flip level gauge. The first liquid outlet 134 is disposed at the lower part of the liquid storage device 13. The first liquid outlet 134 is connected to the liquid storage portion 132. The first liquid outlet 134 is also connected to the pumping device 12 through a tube structure. The pumping device 12 pumps out the test liquid in the liquid storage portion 132 through the first liquid outlet 134, and then the test liquid in the liquid storage portion 132 can be transported to the filling device 14.

[0034] As an implementation method, Figure 3As shown, the filling device 14 includes a slide 141, a bracket 142, a liquid adding module 143 and a liquid level detection module 144. The filling device 14 also includes a first straight line 101, and the first straight line 101 extends substantially in the up-down direction. Specifically, the slide 141 includes a fixed guide rail 1411 and a movable slider 1412. The slide 141 can be fixed to the side bearing portion 113 of the stand 11, and the slide 141 can be connected to the stand 11 by bolts. Specifically, the fixed guide rail 1411 is bolted to the stand 11 so that the slide 141 is bolted to the stand 11, and the movable slider 1412 can move up and down in the fixed guide rail 1411. The movable slider 1412 is also provided with a mounting plate 1412a, and the mounting plate 1412a can be used to install the bracket 142. One end of the bracket 142 is connected to the mounting plate 1412a, and the bracket 142 can move in the direction parallel to the first straight line 101 following the movable slider 1412. The bracket 142 carries the liquid adding module 143 and the liquid level detection module 144 on one side, so that the height of the liquid adding module 143 and the liquid level detection module 144 is adjustable. Further, the bracket 142 is bolted to the mounting plate 1412a, and the plate surface of the bracket 142 is perpendicular to the first straight line 101, which can improve the accuracy of the liquid level detection module 144 in detecting the liquid level in the heat pump. The liquid adding module 143 is arranged on the bracket 142, and the liquid adding module 143 is also connected to the pumping device 12. After the pumping device 12 pumps the test liquid to the liquid adding module 143, the liquid adding module 143 fills the test liquid into the heat pump. The liquid level detection module 144 is at least partially connected to the bracket 142, and the liquid level detection module 144 is used to obtain the liquid level in the heat pump. Further, through the cooperation between the fixed guide rail 1411 and the movable slider 1412, the slide 141 can adjust the height of the filling device 14 to meet the test requirements of heat pumps of different heights.

[0035] As an implementation method, Figure 4As shown, the liquid adding module 143 includes a liquid inlet 1431, a first cavity 1432, and a second liquid outlet 1433. The liquid inlet 1431 is arranged on the upper side of the liquid adding module 143, and the liquid inlet 1431 can be set as a through hole. The liquid inlet 1431 is connected to the pumping device 12, and the test liquid in the liquid storage part 132 can be pumped to the liquid inlet 1431 by the pumping device 12, and then the test liquid can be pumped to the filling device 14 through the liquid inlet 1431. Specifically, the first cavity 1432 extends substantially along the direction of the first straight line 101, and the first cavity 1432 can be set as a through hole. One end of the first cavity 1432 is connected to the liquid inlet 1431, and the test liquid can enter the first cavity 1432 through the liquid inlet 1431. The other end of the first cavity 1432 is connected to the second liquid outlet 1433, and the test liquid can flow out from the second liquid outlet 1433 after entering the first cavity 1432. Specifically, the second liquid outlet 1433 is disposed at the lower end of the first cavity 1432, and the test liquid can enter the heat pump through the second liquid outlet 1433. A plurality of through holes can be disposed at the second liquid outlet 1433, and the provision of the through holes is conducive to the test liquid entering the various pipes in the heat pump.

[0036] As an implementation method, Figure 4 As shown, the liquid adding module 143 also includes a second cavity 1434, which extends substantially along the direction of the first straight line 101, and the two ends of the second cavity 1434 are connected to the outside. Specifically, the first cavity 1432 substantially surrounds the second cavity 1434, which is conducive to saving space of the liquid adding module 143 and facilitating adjustment of the size of the liquid adding module 143 to meet the testing requirements of different heat pump pot mouths. When the present invention detects the heat pump, the lower end portion of the first cavity 1432 and the lower end portion of the second cavity 1434 enter the heat pump, and the test liquid enters the heat pump from the second liquid outlet 1433. The present invention arranges the lower end of the second cavity 1434 to be connected to the outside world. When the liquid level in the heat pump reaches a certain height, the test liquid in the heat pump will enter the second cavity 1434 from the lower end of the second cavity 1434. At the same time, the present invention arranges the upper end of the second cavity 1434 to be connected to the outside world. The test liquid level can rise in the second cavity 1434, and then the liquid level detection module 144 can detect the volume of the test liquid in the heat pump through the liquid level height of the test liquid in the second cavity 1434.

[0037] As an implementation method, Figure 4As shown, the liquid adding module 143 also includes a housing 1435. The liquid inlet 1431 is arranged at the upper end of the housing 1435, the upper end of the first cavity 1432 and the upper end of the second liquid outlet 1433 are both arranged in the upper end of the housing 1435, and the lower end of the first cavity 1432 and the lower end of the second cavity 1434 are arranged in the lower end of the housing 1435. The housing 1435 is also formed with a mounting hole 1436, and the upper and lower ends of the housing 1435 can be connected through the mounting hole 1436. Further, the lower end of the housing 1435 is connected to the bracket 142, and then the liquid adding module 143 can move up and down with the slide 141. The housing 1435 can make the liquid inlet 1431, the first cavity 1432, the second cavity 1434 and the second liquid outlet 1433 form a whole, and the housing 1435 can ensure the stability and reliability of the heat pump test system for new energy vehicles for heat pump testing.

[0038] As an implementation method, Figure 4 As shown, the liquid level test module 144 includes a test block 1441, which can move in the second cavity 1434 along the direction of the first straight line 101. Specifically, the shape of the test block 1441 is the same as that of the second cavity 1434, and the test block 1441 is arranged to fit the inner wall of the second cavity 1434. The test block 1441 will not shake in the second cavity 1434 to affect the measurement of the liquid level. The test block 1441 can be a solid component with a density less than the density of the test liquid, or a hollow component. When the liquid level in the second cavity 1434 rises, the test piece 1441 can rise synchronously with the liquid level in the second cavity 1434, and then the position of the test block 1441 in the second cavity 1434 can reflect the position information of the liquid level in the heat pump. Further, the upper end surface of the test block 1441 is perpendicular to the first straight line 101, thereby ensuring the reliability of the liquid level measurement. Furthermore, the raw material of the test block 1441 can be polyethylene material, which has good self-lubricating and anti-aging properties, is insoluble in general solvents at room temperature, and has low water absorption. The present invention uses polyethylene material, and the test block 1441 will not be subject to large friction when moving in the second cavity 1434, and the test block 1441 will not absorb the test liquid, thereby improving the accuracy of the heat pump detection.

[0039] As an embodiment, the liquid level test module further includes a test sensor 1442 (see Figure 3). The test sensor 1442 is connected to the bracket 142, and the test sensor 1442 can be set above the liquid adding module 143 through a sheet metal. The test sensor 1442 maintains a fixed height with the liquid adding module 143, and the test sensor 1442 can detect the height change of the test block 1441 in the second cavity 1434. Specifically, the test sensor 1442 is directly opposite to the test block 1441, and can accurately sense the height change of the test block 1441. Specifically, when the liquid level in the heat pump is at the set minimum liquid level setting value, the reading of the test sensor 1442 is set to the initial value X 1 , the real-time reading of the test sensor 1442 is X 2 , the height of the liquid level in the heat pump H = X 1 -X 2 , so that the test sensor 1442 can calculate the change in the height of the test liquid in the heat pump according to the change in the height of the test block 1441. Further, the test sensor 1442 can be a laser displacement sensor.

[0040] As an implementation method, Figure 5 As shown, at least a part of the judgment module 16 is connected to the test sensor 1442, and the judgment module 16 can receive the height change information of the test liquid in the heat pump transmitted by the test sensor 1442. The judgment module 16 can calculate the volume of the test liquid in the heat pump according to the liquid level height of the test liquid in the heat pump. At least a part of the judgment module 16 is also connected to the pumping device 12, and the judgment module 16 can calculate the volume of the test liquid pumped by the pumping device 12. By comparing the volume of the test liquid in the heat pump with the volume of the test liquid pumped by the pumping device 12, the judgment module 16 can determine whether there is trapped air in the heat pump. Further, the judgment module 16 can calculate the difference between the volume of the test liquid pumped by the pumping device 12 and the volume corresponding to the maximum liquid level setting value in the heat pump, and the judgment module 16 can make a judgment on whether the volume difference is within the error range. When the liquid adding module 143 adds the test liquid to the maximum liquid level setting value in the heat pump, the judgment module 16 determines whether the volume difference is within the error allowable range. If the judgment is yes, there is no trapped air phenomenon in the heat pump; if the judgment is no, the heat pump is vented to make the liquid level in the heat pump drop to the minimum liquid level setting value of the heat pump, and the filling device 14 pumps the test liquid into the heat pump again to the maximum liquid level setting value in the heat pump. At this time, the judgment module 16 again judges whether the volume difference is within the allowable error range. Repeat the above operation until the error is within the allowable range or the liquid level in the heat pump does not drop when the heat pump is vented. When the test is not completed when the prescribed test time is exceeded, the judgment module 16 judges that there is trapped air in the heat pump, or when the exhaust treatment is performed, the liquid level in the heat pump does not drop, then the judgment module 16 judges that there is trapped air in the heat pump. The present invention judges whether there is trapped air in the internal pipeline of the new energy vehicle thermal management heat pump by comparing the volume of the added test liquid with the rated capacity of the new energy vehicle thermal management heat pump, and the operation is simple.

[0041] like Figure 6 As shown, the present application also provides a new energy vehicle heat pump testing method. When the filling device 14 pumps the test liquid to the maximum set value in the heat pump, the judgment module judges whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum set value in the heat pump is within the allowable error range. If it is judged to be yes, there is no air entrapment in the heat pump; if it is judged to be no, the heat pump is vented until the liquid level drops to the minimum set value of the heat pump, and the test liquid is pumped into the heat pump again to the maximum set value in the heat pump. The judgment module again judges whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum set value in the heat pump is within the allowable error range; until the error is within the allowable range or the liquid level in the heat pump does not drop during the venting treatment, when the liquid level in the heat pump does not drop during the venting treatment, it is judged that there is air entrapment in the heat pump.

[0042] The new energy vehicle heat pump test method specifically includes the following steps:

[0043] S1: Fix the heat pump to the heat pump fixing device so that the heat pump is located below the liquid adding module;

[0044] S2: Start the pumping device and the filling device, adjust the moving slider, and move the bracket, the liquid adding module, and the liquid level detection module downward along the fixed guide rail. When the lower end of the liquid adding module enters the heat pump, tighten the moving slider. Start the pumping device, and the pumping device pumps the test liquid in the liquid storage part to the filling device, and then the test liquid enters the heat pump through the filling device;

[0045] S3: Start the liquid level test module, the test sensor detects the height of the test liquid in the heat pump, and when the liquid level in the heat pump reaches the set maximum liquid level setting value, the pumping device stops working;

[0046] S4: The judgment module calculates the volume of the test liquid pumped out by the pumping device and compares the volume of the test liquid with the volume corresponding to the maximum liquid level setting value of the heat pump to obtain a volume difference. When the volume difference is within the allowable error range, the judgment module determines that there is no trapped air phenomenon in the heat pump;

[0047] S5: When the volume difference is not within the allowable error range, the heat pump is vented to reduce the liquid level in the heat pump to the minimum liquid level setting value of the heat pump, and the filling device 14 pumps the test liquid into the heat pump again to the maximum liquid level setting value in the heat pump;

[0048] S6: Repeat S3 to S5. If the test is not completed within the specified test time or the liquid level in the heat pump does not drop when the exhaust treatment is performed, the judgment module determines that there is air entrapment in the heat pump.

[0049] Compared with the prior art, the new energy vehicle heat pump test system and test method provided by the present invention have the following advantages:

[0050] 1. The present invention adds test liquid into the thermal management heat pump of the new energy vehicle multiple times, and the present invention also performs exhaust treatment on the thermal management heat pump of the new energy vehicle multiple times, so as to accurately measure whether the thermal management heat pump of the new energy vehicle has air entrapment phenomenon.

[0051] 2. The present invention directly compares the volume of the added test liquid with the rated capacity of the thermal management heat pump of the new energy vehicle, has high detection efficiency, and greatly improves production efficiency.

[0052] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims

1. A new energy vehicle heat pump test system, used to test the heat pump, It is characterized in that include: Stand; a liquid storage device, at least partially connected to the stand, for storing a test liquid; a pumping device, at least partially connected to the stand and connected to the liquid storage device, for pumping the test liquid and metering the pumped test liquid; a filling device, at least partially connected to the stand and connected to the pumping device, for pumping the test liquid into the heat pump and obtaining the liquid level in the heat pump; A heat pump fixing device, disposed below the filling device, for fixing the heat pump to be tested; a judgment module, connected to the pumping device and the filling device, for judging whether there is air entrapment in the heat pump; When the filling device pumps the test liquid to the maximum set value in the heat pump, the judgment module judges whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum set value in the heat pump is within the allowable error range, and if it is judged to be yes, there is no trapped air phenomenon in the heat pump; If the judgment is no, the heat pump is vented until the liquid level drops to the minimum setting value of the heat pump, and when the test liquid is pumped into the heat pump again to the maximum setting value of the heat pump, the judgment module again judges whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum setting value of the heat pump is within the allowable error range; Until the error is within the allowable range or the liquid level in the heat pump does not drop during the exhaust process, when the liquid level in the heat pump does not drop during the exhaust process, it is determined that there is air trapping in the heat pump.

2. A new energy vehicle heat pump test system according to claim 1, It is characterized in that The filling device comprises: a slide at least partially connected to the frame; a bracket at least partially connected to the slide and movable along the slide; a liquid adding module, disposed on the bracket and connected to the pumping device, for adding the test liquid into the heat pump; A liquid level detection module is at least partially connected to the bracket and is used to obtain the liquid level in the heat pump.

3. A new energy vehicle heat pump test system according to claim 2, It is characterized in that The liquid adding module comprises: a liquid inlet connected to the pumping device; A first cavity, one end of which is connected to the liquid inlet and is used to transport the test liquid; and a liquid outlet, which is connected to the other end of the first cavity and is used to output the test liquid.

4. A new energy vehicle heat pump test system according to claim 3, Features: The liquid adding module also includes a second cavity, which extends substantially along the first direction, and two ends of the second cavity are connected to the outside.

5. A new energy vehicle heat pump test system according to claim 4, It is characterized in that The liquid level testing module comprises: A test block is disposed in the second cavity, and the test block can move in the second cavity along a first direction; A test sensor is connected to the bracket and is used to test the position of the test block.

6. A new energy vehicle heat pump test system according to claim 1, It is characterized in that The liquid storage device comprises: A liquid storage part, used for storing a test liquid; A liquid filling port, used for filling the test liquid into the liquid storage part; The liquid level detection unit is used to detect the liquid level in the liquid storage unit.

7. A new energy vehicle heat pump test method for testing whether the heat pump has trapped air. Features The steps include: injecting a test fluid into the heat pump to a maximum setting value of the heat pump; Determining whether the difference between the volume of the injected test liquid and the volume of the maximum setting value of the heat pump is within an error range; If it is determined that the difference between the volume of the injected test liquid and the volume of the maximum setting value of the heat pump is within the error range, if it is determined that it is, the test is terminated and it is determined that there is no trapped air phenomenon in the heat pump; If it is determined that the difference between the volume of the injected test liquid and the volume of the maximum setting value of the heat pump exceeds the error range, the heat pump is vented until the liquid level drops to the minimum setting value of the heat pump; When the test liquid is pumped into the heat pump again to the maximum set value in the heat pump, it is determined whether the difference between the volume of the test liquid pumped by the pumping device and the volume of the maximum set value in the heat pump is within an allowable error range; If not, the above steps are performed again until the error is within the allowable range or the liquid level in the heat pump does not drop during the exhaust process. When the liquid level in the heat pump does not drop during the exhaust process, it is determined that there is air trapping in the heat pump.

8. The new energy vehicle heat pump testing method according to claim 7, Features: During the exhaust treatment, a pumping device in the heat pump is started to discharge the gas in the manifold loop of the heat pump.

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