An electric vehicle secondary circuit heat pump system testing device and method

Abstract

A kind of electric vehicle secondary circuit heat pump system testing device and method, testing device includes environment module, for simulating the environment state where to be measured heat pump is located;First working condition module and second working condition module are connected at two sides of to be measured heat pump respectively, with refrigerant as circulating medium, can adjust the heat exchanger load of heat pump system and secondary circuit, simulate actual operating condition of heat pump system;Control module sends control instruction and analyzes, records data;Control module obtains second operating state data by comparison according to the first operating state in the node temperature measurement value, flow measurement value recorded or input, respectively control environment module and working condition module, input additional heat or cold to first working condition module and second working condition module, so that second operating state data is identical or similar with first operating state data, record third operating state data at this time.The heat pump system performance and reliability under multiple working conditions can be measured quickly by the present application.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electric vehicle performance testing, and particularly relates to an electric vehicle secondary circuit heat pump system testing device and method. BACKGROUND

[0002] At present, when an electric vehicle is used in a low-temperature environment such as winter, a thermistor is commonly used for heating to meet the needs of the battery and passengers for suitable temperature. However, this method consumes a large amount of electric energy, resulting in a significant decrease in the winter range of the electric vehicle.

[0003] The electric vehicle uses a secondary circuit heat pump system for thermal management. Due to its modular design, high energy efficiency and low cost, it has gradually become one of the choices for the next generation of technical solutions. However, the driving conditions of the vehicle are complex, and there are many performance and reliability test conditions for the heat pump system, especially the dynamic conditions such as vehicle cold start process, which are complex and time-consuming.

[0004] In addition, for the secondary circuit heat pump system, due to factors such as heat recovery and heat exchange temperature difference, there is a significant difference between the evaporation and condensation temperature and pressure of the environment side and the heat pump system. The existing testing device and method based on the whole vehicle have high cost and complex testing, and it is difficult to meet the large-scale and rapid testing of the heat pump system under a wide range of conditions. SUMMARY

[0005] The present application aims to solve the problems in the prior art and provides an electric vehicle secondary circuit heat pump system testing device and method, which can effectively and stably measure the performance and reliability of the heat pump system under multiple conditions.

[0006] To achieve the above-mentioned purpose, the present application has the following technical solutions:

[0007] An electric vehicle secondary circuit heat pump system testing device, comprising:

[0008] An environment module for simulating the environment state of the heat pump to be tested;

[0009] A first working condition module and a second working condition module are connected on both sides of the heat pump to be tested, using a refrigerant as a circulating medium, which can adjust the load of the heat exchanger of the heat pump system and the secondary circuit, and simulate the actual operating conditions of the heat pump system;

[0010] A control module connected to the environment module, the heat pump to be tested, the first working condition module and the second working condition module, sends control instructions and analyzes and records data;

[0011] The control module obtains the second operating state data by comparison according to the recorded or input node temperature measurement values and flow measurement values in the first operating state, controls the environment module and the first and second working condition modules respectively, inputs additional heat or cold to the first and second working condition modules, so that the second operating state data is the same as or similar to the first operating state data, and records the third operating state data at this time.

[0012] Preferably, the first working condition module comprises, in sequence from one side of the heat pump to be tested, a first temperature measurement unit, a first liquid pump, a first heat exchange unit, a first liquid storage heat exchange unit, a first flow measurement unit and a second temperature measurement unit, and the first working condition module measures and adjusts the heat transfer and load on the one side of the heat pump to be tested.

[0013] Preferably, the second working condition module comprises, in sequence from the other side of the heat pump to be tested, a third temperature measurement unit, a second liquid pump, a second heat exchange unit, a second liquid storage heat exchange unit, a second flow measurement unit and a fourth temperature measurement unit, and the second working condition module measures and adjusts the heat transfer and load on the other side of the heat pump to be tested.

[0014] Preferably, the environment module comprises an insulation box, a temperature and humidity unit and a wind speed unit, the heat pump to be tested is placed in the insulation box, and the temperature and humidity unit and the wind speed unit are used to adjust the temperature, humidity and wind speed in the insulation box.

[0015] A test method for a heat pump system of a secondary circuit of an electric vehicle, which is implemented based on a test device for the heat pump system of the secondary circuit of the electric vehicle and comprises the following steps:

[0016] According to the operating condition of the whole vehicle, first operating state data of the heat pump system of the secondary circuit is obtained.

[0017] The heat pump to be tested is tested by the test device for the heat pump system of the secondary circuit of the electric vehicle, and second operating state data is obtained.

[0018] The first and second operating state data are compared, the test device for the heat pump system of the secondary circuit of the electric vehicle is adjusted so that the second operating state data is the same as or similar to the first operating state data, and third operating state data is obtained.

[0019] Preferably, in the step of obtaining the first operating state data of the heat pump system of the secondary circuit according to the operating condition of the whole vehicle, experimental testing or simulation testing of the real vehicle under a given operating condition of the whole vehicle is performed, or historical test data of the real vehicle is retrieved, and state data of main nodes of the secondary circuit and control parameters of the heat pump system of the secondary circuit are recorded as the first operating state data.

[0020] As preferred, the stored data or the data inputted separately is used as the first running state data.

[0021] As preferred, in the step of obtaining the second running state data, the state data of the refrigerant in the main nodes in the electric vehicle secondary circuit heat pump system testing device and the control parameters of the secondary circuit heat pump system are recorded as the second running state data.

[0022] As preferred, the first running state data includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure and flow before and after the heat exchange of each heat exchange unit, and the vibration; the second running state data includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure and flow before and after the heat exchange of each heat exchange unit, and the vibration; and the third running state data includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure and flow before and after the heat exchange of each heat exchange unit, the vibration, and the system refrigeration and heating capacity and power.

[0023] Compared with the prior art, the present application has at least the following beneficial effects:

[0024] The secondary circuit heat pump system of the present application refers to an automobile thermal management system comprising a heat pump system, a refrigerant-cold carrier heat exchanger and a cold carrier. The heat pump system is a vapor compression cycle system. The present application uses the state data of the main nodes of the real vehicle secondary circuit heat pump system to realize the simulation of the real vehicle working condition environment by adjusting the testing device, so as to test the heat pump system to be tested, thereby reducing the large amount of real vehicle testing required when developing the heat pump system in large quantities, and reducing the energy consumption of the measuring equipment and testing, thereby saving the testing cost. By comparing the first running state data and the second running state data, the testing device is adjusted to realize the simulation of the real vehicle working condition environment, so as to test the heat pump system to be tested, and obtain the third running state data. This reduces the large amount of real vehicle testing required when developing the heat pump system in large quantities, and reduces the energy consumption of the measuring equipment and testing, thereby saving the testing cost. When obtaining the first running state data, the required data can be obtained through experiment or simulation testing or other reasonable ways, and stored in the testing device as the testing working condition of other heat pump systems to be tested. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 is a structural schematic diagram of an electric vehicle secondary circuit heat pump system testing device provided by an embodiment of the present application;

[0027] Figure 2 is a flow chart of a test method of a secondary circuit heat pump system of an electric vehicle provided by an embodiment of the present application;

[0028] Figure 3 is a flow chart of another test method of a secondary circuit heat pump system of an electric vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of embodiments of the present application clearer, the following will be combined with the accompanying drawings for a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] As shown in Figure 1 , an embodiment of the present application provides a test device of a secondary circuit heat pump system of an electric vehicle, which comprises a first working condition module 2, a second working condition module 3, an environment module 4, and a control module 5, wherein,

[0031] The environment module 4 is configured to simulate an environment state in which the heat pump system is located.

[0032] The circulating medium of the first working condition module 2 and the second working condition module 3 is a coolant, which is configured to adjust a load of a heat exchanger of the heat pump system and the secondary circuit, simulate an actual operation condition of the heat pump system, and obtain second and third operation state data of the heat pump system.

[0033] The control module 5 is configured to analyze and record data and control other modules.

[0034] In a possible implementation, the first working condition module 2 comprises a first temperature measuring unit 201, a first liquid pump 202, a first heat exchange unit 203, a first liquid storage heat exchange unit 204, a first flow measuring unit 205, and a second temperature measuring unit 206, which are configured to measure and adjust a heat transfer amount and a load of one side of the heat pump system.

[0035] In a possible implementation, the second working condition module 3 comprises a third temperature measuring unit 301, a second liquid pump 302, a second heat exchange unit 303, a second liquid storage heat exchange unit 304, a second flow measuring unit 305, and a fourth temperature measuring unit 306, which are configured to measure and adjust a heat transfer amount and a load of the other side of the heat pump system.

[0036] The environmental module 4 comprises a heat preservation box 401, a temperature and humidity unit 402, and a wind speed unit 403, which are used to adjust the temperature, humidity, and wind speed of the environment where the heat pump system is located.

[0037] After starting the test, the to-be-tested heat pump 1 is started, and the first liquid pump 202 and the second liquid pump 302 are started to make the coolant circulate in the first working condition module 2 and the second working condition module 3. The control module 5 obtains the second running state data of the test device according to the recorded or input measured values of the node temperature measuring units and the flow measuring units in the first running state, and controls the environmental module 4 and the first working condition module 2 and the second working condition module 3, specifically, adjusts the heat exchange units in the first working condition module 2 and the second working condition module 3 or the temperature and humidity unit or the wind speed unit in the environmental module 4, and inputs additional heat or cold to the first working condition module 2 and the second working condition module 3, so that the second running state data is the same as or similar to the first running state data, and the third running state data at this time is recorded.

[0038] As shown in Figure 2 , the embodiment of the present application provides a test method for a heat pump system of a secondary circuit of an electric vehicle, which comprises the following steps:

[0039] S1: obtaining first running state data of the heat pump system of the secondary circuit according to a running condition of the vehicle;

[0040] S2: testing the to-be-tested heat pump system in the test device of the present application to obtain second running state data;

[0041] S3: comparing the first and second running state data, adjusting the test device of the present application so that the second running state data is the same as or similar to the first running state data, and obtaining third running state data.

[0042] In this embodiment, the state data of the main nodes of the heat pump system of the secondary circuit of the real vehicle are obtained or stored, the real vehicle working condition environment is simulated by adjusting the test device, the to-be-tested heat pump system is tested, a large number of real vehicle tests required in large-scale development of the heat pump system are reduced, the measurement equipment and the energy consumption of the test are reduced, and the test cost can be saved.

[0043] As shown in Figure 3 , in another embodiment of the present application, the specific processes of steps S1, S2, and S3 comprise:

[0044] S11a and S11b: performing experimental test on the real vehicle under a given running condition of the vehicle, or performing simulation test on the real vehicle under the given running condition of the vehicle, or calling historical test data of the real vehicle;

[0045] S12: record the state data of the main nodes of the secondary circuit and the control parameters of the secondary circuit heat pump system as the first running state data.

[0046] S21: test the heat pump system to be tested in the test device;

[0047] S22: record the state data of the main nodes of the test device and the control parameters of the secondary circuit heat pump system as the second running state data.

[0048] S31: adjust the test device so that the second running state data is the same as or similar to the first running state data;

[0049] S32: measure the state of the heat pump system as the third running state data.

[0050] In this embodiment, by comparing the first running state data and the second running state data, the test device is adjusted to simulate the real vehicle working condition environment, and the heat pump system to be tested is tested to obtain the third running state data. The large amount of real vehicle tests required in the large-scale development of the heat pump system is reduced, and the energy consumption of the measuring equipment and the test is reduced, which can save the test cost. In obtaining the first running state data, the required data can be obtained by experiment or simulation test or other reasonable means, and the test device is pre-stored as the test working condition of other heat pump systems to be tested.

[0051] In a possible implementation, before step S2, the stored or separately input data can also be used as the first running state data.

[0052] In a possible implementation, the first running state data in step S1 includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure, flow, vibration before and after heat exchange of each heat exchange unit, etc. The second running state data in step S2 includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure, flow, vibration before and after heat exchange of each heat exchange unit, etc. The third running state data in step S3 includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure, flow, vibration before and after heat exchange of each heat exchange unit, system refrigeration and heating capacity, power, etc.

[0053] The information interaction, execution process, etc. between the modules and units in the above test device are based on the same concept as the embodiments of the present application, and the specific content can be referred to the description of the method embodiments of the present application, which will not be described here.

[0054] Based on the test of the electric vehicle heat pump system by the above test device, the embodiments of the present application can quickly adjust the test working condition, and can significantly speed up the test speed, thereby improving the efficiency of the heat pump system in large-scale development, and helping to quickly develop more efficient heat pump systems.

[0055] In the present application, the terms "first", "second" and "third" and the like, are used only for descriptive purposes, to distinguish one entity or operation from another, and are not to be construed as implying or implying any relative importance of the different entities or operations. Moreover, the term "comprising", as well as variations such as "comprise" and "comprises", is intended to cover non-exclusive inclusion, so that a process, method, article or device component that includes a list of elements includes those elements, but also other elements not expressly listed or that are included in any combination thereof, or that are inherent in such a process, method, article or device.

[0056] It should be noted that the above only describes the preferred embodiments of the present application, and the present application is not limited to the precise structures described above and shown in the drawings. The present application is intended to cover any variations, uses and applicability changes that follow the general principles of the present application and include common knowledge or common means in the art that are not disclosed by the present application. The scope of the present application is only limited by the appended claims.

Claims

1. An electric vehicle secondary circuit heat pump system test device, characterized by, The application relates to a test device for an electric vehicle secondary circuit heat pump system, which comprises the following parts: an environment module (4) for simulating the environment state of a heat pump (1) to be tested; a first working condition module (2) and a second working condition module (3) connected to two sides of the heat pump (1) to be tested respectively, which can adjust the heat exchanger load of the heat pump system and the secondary circuit, and simulate the actual working condition of the heat pump system; a control module (5) connected to the environment module (4), the heat pump (1) to be tested, the first working condition module (2) and the second working condition module (3), which sends control instructions and analyzes and records data; the control module (5) obtains second running state data by comparison according to the recorded or input first running state node temperature measurement values and flow measurement values, controls the environment module (4), the first working condition module (2) and the second working condition module (3) respectively, inputs additional heat or cold to the first working condition module (2) and the second working condition module (3), and makes the second running state data the same as or similar to the first running state data, and records third running state data at the moment.

2. The electric vehicle secondary circuit heat pump system test device of claim 1, wherein, The first working condition module (2) comprises a first temperature measurement unit (201), a first liquid pump (202), a first heat exchange unit (203), a first liquid storage heat exchange unit (204), a first flow measurement unit (205) and a second temperature measurement unit (206) connected in sequence on one side of the heat pump (1) to be tested, and the first working condition module (2) measures and adjusts the heat transfer amount and load on one side of the heat pump (1) to be tested.

3. The electric vehicle secondary circuit heat pump system test device of claim 2, wherein, The second working condition module (3) comprises a third temperature measurement unit (301), a second liquid pump (302), a second heat exchange unit (303), a second liquid storage heat exchange unit (304), a second flow measurement unit (305) and a fourth temperature measurement unit (306) connected in sequence on the other side of the heat pump (1) to be tested, and the second working condition module (3) measures and adjusts the heat transfer amount and load on the other side of the heat pump (1) to be tested.

4. The electric vehicle secondary circuit heat pump system test device of claim 1, wherein, The environment module (4) comprises an insulation box (401), a temperature and humidity unit (402) and a wind speed unit (403), the heat pump (1) to be tested is arranged in the insulation box (401), and the temperature and humidity unit (402) and the wind speed unit (403) are used for adjusting the temperature, humidity and wind speed in the insulation box (401).

5. A test method for a secondary loop heat pump system of an electric vehicle, characterized in that, The test device for the electric vehicle secondary circuit heat pump system according to any one of claims 1 to 4 is realized by the following steps: first running state data of the secondary circuit heat pump system is obtained according to the whole vehicle running condition; second running state data is obtained by testing the heat pump (1) to be tested through the electric vehicle secondary circuit heat pump system test device; first and second running state data are compared, the electric vehicle secondary circuit heat pump system test device is adjusted, the second running state data is made the same as or similar to the first running state data, and third running state data is obtained.

6. The method of claim 5, wherein, In the step of obtaining the first operation state data of the secondary circuit heat pump system according to the whole vehicle operation condition, the real vehicle is tested under the given whole vehicle operation condition, or the real vehicle is simulated under the given whole vehicle operation condition, or the historical test data of the real vehicle is called to record the state data of the main nodes of the secondary circuit and the control parameters of the secondary circuit heat pump system as the first operation state data.

7. The method of claim 5, wherein, The stored data or the data inputted additionally is used as the first operation state data.

8. The method of claim 5, wherein, In the step of obtaining the second operation state data, the state data of the cold carrier at the main nodes in the electric vehicle secondary circuit heat pump system test device and the control parameters of the secondary circuit heat pump system are recorded as the second operation state data.

9. The method of claim 5, wherein, The first operation state data includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure, flow, vibration before and after heat exchange of each heat exchange unit; the second operation state data includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure, flow, vibration before and after heat exchange of each heat exchange unit; and the third operation state data includes the temperature, humidity, wind speed of the environment where the heat pump system is located, the temperature, pressure, flow, vibration before and after heat exchange of each heat exchange unit, and the system refrigeration and heating capacity and power.

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