Fuel cell engine test bench

Abstract

The embodiment of the utility model discloses a fuel cell engine test bench, and the test bench comprises an external cooling module which can adjust the flow of a cooling medium; the cooling module comprises a first cooling pipeline assembly and a second cooling pipeline assembly, and the first cooling pipeline assembly and the second cooling pipeline assembly are used for providing a cooling medium for the cooling cavity and cooling the cooling medium; the total amounts of cooling media capable of cooling in the same time of the first cooling pipeline assembly and the second cooling pipeline assembly are different; the hydrogen supply module comprises a first hydrogen supply pipeline, a second hydrogen supply pipeline and a hydrogen source, and the first hydrogen supply pipeline and the second hydrogen supply pipeline can provide different total amounts of hydrogen within the same time. According to the fuel cell engine test board provided by the embodiment of the invention, fuel cell engines with different powers can be measured, and the problem that different fuel cell engine test boards are needed for measuring the fuel cell engines with different powers is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell engine test, in particular to a fuel cell engine test bench. BACKGROUND

[0002] In the current fuel cell engine test process, due to the limitation of the measurement or control range of valve parts, flow meters and other components, the measurement range of the fuel cell engine test bench is relatively narrow, which leads to the low universality of the fuel cell engine test bench, resulting in the need to equip different power fuel cell engine test benches to meet the test requirements of different powers in actual production test, which increases the test cost and the demand for test site size. CONTENT OF THE UTILITY MODEL

[0003] The embodiment of the present application discloses a fuel cell engine test bench, which can measure fuel cell engines of different powers and prevent the problem of needing different fuel cell engine test benches to measure different fuel cell engines.

[0004] In order to achieve the above-mentioned purpose, the embodiment of the present application provides a fuel cell engine test bench, which comprises: an external cooling module, the external cooling module is used for connecting an external cooling source, and the external cooling module can adjust the flow of the cooling medium; a cooling module, a first end of the cooling module is used for connecting a cooling cavity of a fuel cell engine, and a second end of the cooling module is used for connecting the external cooling module, the cooling module comprises a first cooling pipe assembly and a second cooling pipe assembly, the first cooling pipe assembly and the second cooling pipe assembly are used for providing the cooling medium to the cooling cavity and cooling the cooling medium, and the total amount of the cooling medium that can be cooled by the first cooling pipe assembly and the second cooling pipe assembly in the same time is different; a hydrogen supply module, the hydrogen supply module is used for simulating hydrogen supply, the hydrogen supply module is connected to an air inlet of the fuel cell engine, and the hydrogen supply module comprises a first hydrogen supply pipe, a second hydrogen supply pipe and a hydrogen source, the first hydrogen supply pipe and the second hydrogen supply pipe are connected to the hydrogen source, and the total amount of hydrogen that can be provided by the first hydrogen supply pipe and the second hydrogen supply pipe in the same time is different.

[0005] As an optional implementation, the cooling cavity comprises a first cooling cavity, and the first cooling pipe assembly comprises: a first liquid inlet pipe, an inlet end of the first liquid inlet pipe is connected to the external cooling module, and an outlet end of the first liquid inlet pipe is connected to the first cooling cavity; a first liquid outlet pipe, an inlet end of the first liquid outlet pipe is connected to the first cooling cavity, and an outlet end of the first liquid outlet pipe is connected to the external cooling module; and a first heat exchanger, the first heat exchanger is connected to the first liquid inlet pipe and the first liquid outlet pipe.

[0006] As an optional implementation, the first cooling pipeline assembly comprises a first connecting pipeline, one end of the first connecting pipeline being in communication with the first liquid inlet pipeline, and the other end of the first connecting pipeline being in communication with the first liquid outlet pipeline.

[0007] As an optional implementation, the cooling module comprises a first flow meter arranged in the first liquid inlet pipeline, the first flow meter being configured to detect the flow rate of the cooling medium in the first liquid inlet pipeline.

[0008] As an optional implementation, the cooling module comprises a first three-way diverter valve, first and second interfaces of the first three-way diverter valve being in communication with the first liquid inlet pipeline respectively, and a third interface of the first three-way diverter valve being in communication with the first connecting pipeline.

[0009] As an optional implementation, the cooling module comprises a first on-off valve arranged in the first connecting pipeline, the first on-off valve being configured to control the communication of the first connecting pipeline.

[0010] As an optional implementation, the second cooling pipeline assembly comprises a second liquid inlet pipeline, an inlet end of the second liquid inlet pipeline being in communication with the external cooling module, and an outlet end of the second liquid inlet pipeline being in communication with the first cooling cavity; a second liquid outlet pipeline, an inlet end of the second liquid outlet pipeline being in communication with the first cooling cavity, and an outlet end of the second liquid outlet pipeline being in communication with the first liquid outlet pipeline; and a second heat exchanger, the second heat exchanger being in communication with the second liquid inlet pipeline and the second liquid outlet pipeline, and the second heat exchanger and the first heat exchanger having different heat exchange powers.

[0011] As an optional implementation, the cooling module comprises a buffer water tank, the buffer water tank being arranged in the first liquid outlet pipeline and being located downstream of the connection between the first liquid outlet pipeline and the second liquid outlet pipeline.

[0012] As an optional implementation, the cooling module comprises a liquid level switch arranged in the buffer water tank, the liquid level switch being configured to detect the liquid level in the buffer water tank.

[0013] As an optional implementation, the cooling module comprises a first circulating pump, the first circulating pump being arranged in the first liquid outlet pipeline and being located downstream of the connection between the first liquid outlet pipeline and the second liquid outlet pipeline, and the first circulating pump being configured to drive the cooling medium to flow to the external cooling module.

[0014] As an optional implementation, the cooling cavity further comprises a second cooling cavity, and the cooling module comprises a first auxiliary cooling pipeline assembly and a second auxiliary cooling pipeline assembly, the first auxiliary cooling pipeline assembly and the second auxiliary cooling pipeline assembly being configured to provide the cooling medium to the second cooling cavity and to cool the cooling medium, and the first auxiliary cooling pipeline assembly and the second auxiliary cooling pipeline assembly being capable of cooling different total amounts of the cooling medium in the same time.

[0015] As an optional implementation, the first auxiliary cooling pipeline assembly comprises: a first auxiliary liquid inlet pipeline, an inlet end of the first auxiliary liquid inlet pipeline being in communication with the outer cooling module, and an outlet end of the first auxiliary liquid inlet pipeline being in communication with the second cooling cavity; a first auxiliary liquid outlet pipeline, an inlet end of the first auxiliary liquid outlet pipeline being in communication with the second cooling cavity, and an outlet end of the first auxiliary liquid outlet pipeline being in communication with the outer cooling module; and a first auxiliary heat exchanger, the first auxiliary heat exchanger being in communication with the first auxiliary liquid inlet pipeline and the first auxiliary liquid outlet pipeline.

[0016] As an optional implementation, the cooling module comprises: a first auxiliary valve, the first auxiliary valve being arranged in the first auxiliary liquid inlet pipeline and being used for controlling the communication of the first auxiliary liquid inlet pipeline; and a second auxiliary valve, the second auxiliary valve being arranged in the second auxiliary liquid inlet pipeline and being used for controlling the communication of the second auxiliary liquid inlet pipeline.

[0017] As an optional implementation, the second auxiliary cooling pipeline assembly comprises: a second auxiliary liquid inlet pipeline, an inlet end of the second auxiliary liquid inlet pipeline being in communication with the outer cooling module, and an outlet end of the second auxiliary liquid inlet pipeline being in communication with the first auxiliary liquid inlet pipeline; a second auxiliary liquid outlet pipeline, an inlet end of the second auxiliary liquid outlet pipeline being in communication with the first auxiliary liquid outlet pipeline, and an outlet end of the second auxiliary liquid outlet pipeline being in communication with the outer cooling module; and a second auxiliary heat exchanger, the second auxiliary heat exchanger being in communication with the second auxiliary liquid inlet pipeline and the second auxiliary liquid outlet pipeline, and the second auxiliary heat exchanger and the first auxiliary heat exchanger having different heat exchange powers.

[0018] As an optional implementation, the cooling module comprises: a first auxiliary flow meter, the first auxiliary flow meter being arranged in the first auxiliary liquid inlet pipeline and being located downstream of the connection between the second auxiliary liquid inlet pipeline and the first auxiliary liquid inlet pipeline; and a second auxiliary flow meter, the second auxiliary flow meter being arranged in the first auxiliary liquid inlet pipeline and being located upstream of the connection between the second auxiliary liquid inlet pipeline and the first auxiliary liquid inlet pipeline.

[0019] As an optional implementation, the cooling module comprises: a second circulating pump, the second circulating pump being arranged in the first auxiliary liquid outlet pipeline and being located upstream of the connection between the second auxiliary liquid outlet pipeline and the first auxiliary liquid outlet pipeline.

[0020] As an optional implementation, the hydrogen supply module comprises: a first gas flow meter, the first gas flow meter being arranged in the first hydrogen supply pipeline and being used for detecting the flow of hydrogen in the first hydrogen supply pipeline; and a second gas flow meter, the second gas flow meter being arranged in the second hydrogen supply pipeline and being used for detecting the flow of hydrogen in the second hydrogen supply pipeline, the first gas flow meter and the second gas flow meter having different ranges.

[0021] As an optional implementation, the hydrogen supply module comprises a pressure reducing valve arranged in the first hydrogen supply pipeline, and the pressure reducing valve is located upstream of the connection between the first hydrogen supply pipeline and the second hydrogen supply pipeline.

[0022] As an optional implementation, the hydrogen supply module comprises a first hydrogen supply valve arranged in the first hydrogen supply pipeline, and the first hydrogen supply valve is located downstream of the connection between the first hydrogen supply pipeline and the second hydrogen supply pipeline; and a second hydrogen supply valve arranged in the second hydrogen supply pipeline.

[0023] As an optional implementation, the external cooling module comprises an external cooling liquid inlet pipeline, an inlet end of the external cooling liquid inlet pipeline is used to communicate with an external cooling source, and an outlet end of the external cooling liquid inlet pipeline is communicated with the cooling module; an external cooling liquid outlet pipeline, an inlet end of the external cooling liquid outlet pipeline is communicated with the cooling module; and an external cooling heat exchanger, the external cooling heat exchanger is communicated with the external cooling liquid inlet pipeline and the external cooling liquid outlet pipeline.

[0024] As an optional implementation, the external cooling module comprises an adjusting pump arranged in the external cooling liquid inlet pipeline, and the adjusting pump is used to adjust the flow of the cooling medium delivered by the external cooling liquid inlet pipeline.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] The fuel engine test bench provided by the application can supply hydrogen to the fuel cell engine using the first hydrogen supply pipeline or the second hydrogen supply pipeline according to the power of the fuel engine when testing the fuel engine, and can cool the fuel engine using the first cooling pipeline assembly or the second cooling pipeline assembly according to the power of the fuel engine. The fuel engine test bench provided by the application improves the range of testing power of the fuel cell engine, and also ensures the control stability, responsiveness and accuracy of the fuel engine test bench when testing fuel cell engines with different powers. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the 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 application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The structural diagram of the fuel cell engine test bench provided by the application is shown in the following figure:

[0029] Figure 2 The structural diagram of the cooling module and the external cooling module provided by the application is shown in the following figure:

[0030] Figure 3 Structure diagram of hydrogen supply module provided for the embodiment of the present application;

[0031] Figure 4 Simple flow chart of operation method of fuel cell engine test bench provided for the embodiment of the present application.

[0032] Legend of reference signs:

[0033] 100-fuel cell engine test bench; 101-fuel cell engine; 1-external cooling module; 11-external cooling liquid inlet pipeline; 12-external cooling liquid outlet pipeline; 13-external cooling heat exchanger; 2-cooling module; 21-first cooling pipeline assembly; 211-first liquid inlet pipeline; 212-first liquid outlet pipeline; 213-first heat exchanger; 214-first connecting pipeline; 215-first flow meter; 216-first three-way flow dividing valve; 217-first on-off valve; 22-second cooling pipeline assembly; 221-second liquid inlet pipeline; 222-second liquid outlet pipeline; 223-second heat exchanger; 23-buffer water tank; 24-liquid level switch; 25-first circulating pump; 26-first auxiliary cooling pipeline assembly; 261-first auxiliary liquid inlet pipeline; 262-first auxiliary liquid outlet pipeline; 263-first auxiliary heat exchanger; 264-first auxiliary valve; 265-first auxiliary flow meter; 27-second auxiliary cooling pipeline assembly; 271-second auxiliary liquid inlet pipeline; 272-second auxiliary liquid outlet pipeline; 273-second auxiliary heat exchanger; 274-second auxiliary valve; 275-second auxiliary flow meter; 28-second circulating pump; 3-hydrogen supply module; 31-first hydrogen supply pipeline; 311-first gas flow meter; 312-first hydrogen supply valve; 32-second hydrogen supply pipeline; 321-second gas flow meter; 322-second hydrogen supply valve; 33-pressure reducing valve. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0035] In the present application, the terms "upper", "lower", "top", "bottom", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Moreover, the aforementioned partial terms can be used to represent other meanings in addition to the orientation or positional relationship, for example, the term "upper" can also be used to represent a certain dependent relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0037] In addition, the terms "mount", "set", "provided with", "connected", "connected" should be broadly understood. For example, it can be a fixed connection, a detachable connection, or a monolithic structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0038] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0039] In the current test process of fuel cell engines, due to the inherent limitations of valve, flow meter and other key components themselves, the measurement range of the fuel cell engine test bench is relatively narrow. Specifically, the limiting factors of valve, flow meter and other key components make the fuel cell engine test bench often only be able to test fuel cell engines within a certain power range when designed and applied, and cannot be flexibly adapted to more extensive or different levels of fuel cell engine power requirements.

[0040] The limitation of the measurement range of the fuel cell engine test bench not only reduces the universality of the fuel cell engine test bench, but also affects the test efficiency and cost-effectiveness of the fuel cell engine test bench. In the actual production and research and development process, with the continuous progress and diversification of fuel cell engine technology, the power output range of fuel cell engines is also expanding. Therefore, in order to meet the testing needs of different power levels, a large amount of funds and resources need to be invested to purchase fuel cell engine test benches for different power segments.

[0041] At the same time, each fuel cell engine test bench needs to occupy a certain production space, and with the increase in the number of fuel cell engine test benches, the required site area will also expand accordingly. This not only increases the operating costs of the enterprise, but also may pose certain challenges to the production layout and resource allocation of the enterprise.

[0042] In order to solve the above problems, the inventors study the limitations of the existing fuel cell engine test bench, improve the existing fuel cell engine test bench, and design a fuel cell engine test bench capable of detecting fuel cell engines of different power ranges, thereby preventing the problem that different fuel cell engine test benches are needed to measure fuel cell engines of different powers, and achieving the purposes of improving production efficiency and saving test costs.

[0043] Based on this, the embodiment of the present application discloses a fuel cell engine test bench, which solves the problem that different fuel cell engine test benches are needed to measure fuel cell engines of different powers.

[0044] The technical solutions of the present application will be further described below with reference to the embodiments and drawings.

[0045] Please refer to Figure 1 , Figure 1 The structure diagram of the fuel cell engine test bench 100 provided by the embodiment of the present application is shown in the figure. The embodiment of the present application discloses a fuel cell engine test bench 100, which comprises: an external cooling module 1, the external cooling module 1 is used for connecting an external cooling source, and the external cooling module 1 can adjust the flow of the cooling medium; a cooling module 2, a first end of the cooling module 2 is used for connecting a cooling cavity of a fuel cell engine 101, and a second end of the cooling module 2 is used for connecting the external cooling module 1, the cooling module 2 comprises a first cooling pipe assembly 21 and a second cooling pipe assembly 22, the first cooling pipe assembly 21 and the second cooling pipe assembly 22 are used for providing the cooling medium to the cooling cavity and cooling the cooling medium, and the total amount of the cooling medium that can be cooled by the first cooling pipe assembly 21 and the second cooling pipe assembly 22 in the same time is different; a hydrogen supply module 3, the hydrogen supply module 3 is used for simulating hydrogen supply, the hydrogen supply module 3 is connected to an air inlet of the fuel cell engine 101, and the hydrogen supply module 3 comprises a first hydrogen supply pipe 31, a second hydrogen supply pipe 32 and a hydrogen source, the first hydrogen supply pipe 31 and the second hydrogen supply pipe 32 are connected to the hydrogen source, and the total amount of hydrogen that can be provided by the first hydrogen supply pipe 31 and the second hydrogen supply pipe 32 in the same time is different.

[0046] The external cooling module 1 is used for connecting an external cooling source, the external cooling source inputs the cooling medium into the external cooling module 1, and the external cooling module 1 can adjust the flow of the cooling medium, so that the flow of the cooling medium corresponds to fuel cell engines 101 of different powers. When the power of the fuel cell engine 101 is large, more cooling medium is needed to take away the generated heat, so as to maintain the normal working temperature of the fuel cell engine 101. Conversely, when the power of the fuel cell engine 101 is small, the flow of the cooling medium needed will also be correspondingly reduced.

[0047] Optionally, the cooling medium can be cooling water, a cooling solution or other cooling medium capable of achieving fuel engine cooling.

[0048] Optionally, the way that the outer cooling module 1 adjusts the flow of the cooling medium can be to adjust the flow by changing the rotation speed of the pump that provides the cooling medium, or to adjust the flow by setting an adjusting valve between the external cooling source and the outer cooling module 1, or to adjust the flow by changing the diameter of the pipe in the outer cooling module 1.

[0049] The first end of the cooling module 2 is used to communicate with the cooling cavity of the fuel cell engine 101, and the second end of the cooling module 2 is used to communicate with the outer cooling module 1. The cooling medium can enter the cooling module 2 through the outer cooling module 1, enter the cooling cavity of the fuel cell engine 101 through the cooling module 2, and thus take away the heat generated by the fuel cell engine 101 during the test. The cooling medium after passing through the cooling cavity of the fuel cell engine 101 reflows into the cooling module 2, and the cooling module 2 can cool the cooling medium that has absorbed heat and then flow into the outer cooling module 1 to discharge the fuel cell engine test bench 100.

[0050] Specifically, the cooling module 2 includes a first cooling pipe assembly 21 and a second cooling pipe assembly 22, and the total amount of cooling medium that can be cooled by the first cooling pipe assembly 21 and the second cooling pipe assembly 22 at the same time is different.

[0051] It can be understood that the first cooling pipe assembly 21 and the second cooling pipe assembly 22 are connected in parallel to the cooling cavity of the fuel cell engine 101, and when testing a small-power fuel cell engine 101 and a large-power fuel cell engine 101, the first cooling pipe assembly 21 or the second cooling pipe assembly 22 can be opened alone to cool the fuel cell engine 101, so that when using fuel cell engines 101 of different powers, the fuel cell engine 101 can be accurately cooled.

[0052] Optionally, the first cooling pipe assembly 21 can be responsible for the cooling of the small-power fuel cell engine 101, and the second cooling pipe assembly 22 can be responsible for the cooling of the large-power fuel cell engine 101.

[0053] Specifically, the power of the small-power fuel cell engine 101 can be between 50-250KW, and the power of the large-power fuel cell engine 101 can be between 250KW-500KW.

[0054] When testing the small-power fuel cell engine 101, in order to reduce energy consumption and avoid excessive cooling, the first cooling pipeline assembly 21 with relatively weak cooling capacity can be used. When testing the large-power fuel cell engine 101, more cooling medium is needed to take away heat, at this time, the second cooling pipeline assembly 22 with stronger cooling capacity can be used preferentially. The cooling module 2 can flexibly adjust the flow and cooling capacity of the cooling medium according to the actual working condition of the fuel cell engine 101, so as to realize the optimization of energy consumption while ensuring the test results of the fuel cell engine 101.

[0055] The hydrogen supply module 3 is used to simulate the hydrogen supply when the fuel cell engine 101 is normally working. The hydrogen supply module 3 is connected to the air inlet of the fuel cell engine 101, and the hydrogen enters the fuel cell engine 101 through the hydrogen supply module 3. The hydrogen can react after entering the fuel cell engine 101 to ensure the operation of the fuel cell engine 101.

[0056] The hydrogen supply module 3 includes a first hydrogen supply pipeline 31, a second hydrogen supply pipeline 32 and a hydrogen source. The first hydrogen supply pipeline 31 and the second hydrogen supply pipeline 32 are connected to the hydrogen source. The hydrogen source provides hydrogen and makes the hydrogen enter the fuel cell engine 101 through the first hydrogen supply pipeline 31 or the second hydrogen supply pipeline 32.

[0057] The total amount of hydrogen provided by the first hydrogen supply pipeline 31 and the second hydrogen supply pipeline 32 in the same time is different. When testing the small-power fuel cell engine 101, in order to reduce energy consumption and cost, the first hydrogen supply pipeline 31 with less total amount of hydrogen provided can be used. When testing the large-power fuel cell engine 101, more hydrogen is needed for energy conversion of the fuel engine, at this time, the second hydrogen supply pipeline 32 with more total amount of hydrogen provided can be used preferentially. The hydrogen supply module 3 can flexibly adjust the flow of hydrogen according to the actual working condition of the fuel cell engine 101, so as to realize the optimization of energy consumption while ensuring the normal operation and test results of the fuel cell engine 101.

[0058] In this way, the fuel engine test bench provided by the embodiment of the present application can use the first hydrogen supply pipeline 31 or the second hydrogen supply pipeline 32 to supply hydrogen for the fuel cell engine 101 according to the different power of the fuel engine when testing the fuel engine, and use the first cooling pipeline assembly 21 or the second cooling pipeline assembly 22 to cool the fuel engine according to the different power of the fuel engine. The fuel engine test bench provided by the embodiment of the present application improves the test power range of the fuel cell engine 101, and also ensures the control stability, responsiveness and accuracy of the fuel engine test bench when testing the fuel cell engine 101 with different power.

[0059] Please refer to Figure 2 , Figure 2A structural diagram of the cooling module 2 and the outer cooling module 1 is provided for the embodiments of the present application. In some embodiments, the cooling cavity includes a first cooling cavity for cooling the heat generated by the fuel cell stack of the fuel cell engine 101 when in operation.

[0060] The first cooling pipeline assembly 21 includes a first liquid inlet pipeline 211 and a first liquid outlet pipeline 212. The inlet end of the first liquid inlet pipeline 211 is in communication with the outer cooling module 1, and the outlet end of the first liquid inlet pipeline 211 is in communication with the first cooling cavity. The first liquid inlet pipeline 211 is used to input the cooling medium from the outer cooling module 1 into the first cooling cavity.

[0061] The inlet end of the first liquid outlet pipeline 212 is in communication with the first cooling cavity, and the outlet end of the first liquid outlet pipeline 212 is in communication with the outer cooling module 1. The first liquid outlet pipeline 212 is used to output the cooling medium from the first cooling cavity and input it into the outer cooling module 1.

[0062] The first cooling pipeline assembly 21 further includes a first heat exchanger 213, which is in communication with the first liquid inlet pipeline 211 and the first liquid outlet pipeline 212. The first heat exchanger 213 can transfer the heat in the high-temperature cooling medium flowing out of the first cooling cavity to the external environment or another cooling medium, thereby cooling the cooling medium. The cooled cooling medium can flow into the outer cooling module 1 and be discharged from the fuel cell engine test bench 100 after being secondarily cooled by the outer cooling module 1.

[0063] It should be noted that the first cooling pipeline assembly 21, the second cooling pipeline assembly 22, the first hydrogen supply pipeline 31, and the second hydrogen supply pipeline 32 can have the same structure and working principle, respectively. Hereinafter, the structure and working principle of the first cooling pipeline assembly 21 and the first hydrogen supply pipeline 31 will be described and introduced, and the structure and working principle of the second cooling pipeline assembly 22 and the second hydrogen supply pipeline 32 will not be described.

[0064] Please refer to Figure 2 In some embodiments, the first cooling pipeline assembly 21 includes a first connecting pipeline 214, one end of which is in communication with the first liquid inlet pipeline 211, and the other end of which is in communication with the first liquid outlet pipeline 212. The first connecting pipeline 214 can control the amount of water entering the fuel cell engine 101 by communicating with the first liquid inlet pipeline 211 and the first liquid outlet pipeline 212. When the cooling medium input into the first liquid inlet pipeline 211 is excessive, the excess cooling medium can flow into the first connecting pipeline 214 and be discharged from the first liquid outlet pipeline 212.

[0065] Please refer to Figure 2In some possible embodiments, the cooling module 2 comprises a first flow meter 215 arranged in the first liquid inlet pipe 211, and the first flow meter 215 is configured to detect the flow rate of the cooling medium in the first liquid inlet pipe 211. By measuring the flow rate of the cooling medium in the first liquid inlet pipe 211 in real time, the fuel cell engine test bench 100 can accurately control the supply of the cooling medium to meet the cooling requirements under different working conditions.

[0066] Referring to Figure 2 As an optional embodiment, the cooling module 2 comprises a first three-way valve 216, and a first interface and a second interface of the first three-way valve 216 are respectively connected to the first liquid inlet pipe 211, and a third interface of the first three-way valve 216 is connected to the first connecting pipe 214. By adjusting the opening degrees of the first interface, the second interface and the third interface of the first three-way valve 216, the flow rates of the cooling medium in the first liquid inlet pipe 211 and the first connecting pipe 214 are adjusted, so that the flow rate of the cooling medium in the first heat exchanger 213 is controlled, and the cooling medium in the first cooling pipe assembly 21 can be input into the first liquid outlet pipe 212.

[0067] Referring to Figure 2 In some embodiments, the cooling module 2 comprises a first on-off valve 217 arranged in the first connecting pipe 214, and the first on-off valve 217 is configured to control the connection of the first connecting pipe 214. By opening or closing the first on-off valve 217, the flow path of the cooling medium can be accurately controlled. When the cooling medium needs to flow through the first liquid inlet pipe 211 and the first liquid outlet pipe 212 for heat dissipation, the first on-off valve 217 can be opened to allow the cooling medium to flow in; otherwise, when the cooling medium does not need to flow through the first liquid inlet pipe 211 and the first liquid outlet pipe 212, the first on-off valve 217 can be closed to save energy and avoid unnecessary heat transfer.

[0068] Referring to Figure 2 In some possible embodiments, the second cooling pipe assembly 22 comprises a second liquid inlet pipe 221 and a second liquid outlet pipe 222, and an inlet end of the second liquid inlet pipe 221 is connected to the outer cooling module 1, and an outlet end of the second liquid inlet pipe 221 is connected to the first cooling cavity. The second liquid inlet pipe 221 is configured to input the cooling medium from the outer cooling module 1 into the first cooling cavity.

[0069] An inlet end of the second liquid outlet pipe 222 is connected to the first cooling cavity, and an outlet end of the second liquid outlet pipe 222 is connected to the first liquid outlet pipe 212. The second liquid outlet pipe 222 is configured to output the cooling medium from the first cooling cavity and input the cooling medium into the outer cooling module 1.

[0070] The second cooling pipeline assembly 22 further comprises a second heat exchanger 223, which is connected to the second liquid inlet pipeline 221 and the second liquid outlet pipeline 222. The second heat exchanger 223 can transfer the heat in the high-temperature cooling medium flowing out of the first cooling cavity to the external environment or another cooling medium, thereby cooling the cooling medium. The cooled cooling medium can flow into the outer cooling module 1 and be discharged after secondary cooling by the outer cooling module 1.

[0071] The heat exchange power of the second heat exchanger 223 and the first heat exchanger 213 is different. In the same time, the flow of the cooling medium that can be cooled by the first heat exchanger 213 is greater than the flow of the cooling medium that can be cooled by the second heat exchanger 223.

[0072] Please refer to Figure 2 In some embodiments, the cooling module 2 comprises a buffer tank 23, which is arranged in the first liquid outlet pipeline 212 and is located downstream of the connection between the first liquid outlet pipeline 212 and the second liquid outlet pipeline 222. After flowing through the first liquid outlet pipeline 212, the cooling medium first enters the buffer tank 23 for buffering and storage, and then continues to flow to the outer cooling module 1.

[0073] The buffer tank 23 is used for buffering and storing the cooling medium. The buffer tank 23 can provide additional storage space during the flow of the cooling medium, which helps to balance the flow fluctuations in the cooling module 2. Through the buffer tank 23, the cooling module 2 can more flexibly cope with flow changes and reduce potential damage to other components caused by flow fluctuations.

[0074] Please refer to Figure 2 As an optional implementation, the cooling module 2 comprises a liquid level switch 24 arranged in the buffer tank 23, which can detect the liquid level inside the buffer tank 23. When the liquid level rises to a preset position, a signal will be sent to trigger the corresponding control system.

[0075] By monitoring the liquid level, the liquid level switch 24 can prevent system failures caused by overflow of the cooling medium due to excessive liquid level. The arrangement of the liquid level switch 24 helps to protect other components in the cooling system, such as circulating pumps, heat exchangers, etc., from damage or failure caused by abnormal liquid level.

[0076] Please refer to Figure 2 In some embodiments, the cooling module 2 comprises a first circulating pump 25 arranged in the first liquid outlet pipeline 212, which is located downstream of the connection between the first liquid outlet pipeline 212 and the second liquid outlet pipeline 222. The first circulating pump 25 is used to drive the cooling medium to flow to the outer cooling module 1, improving the flow efficiency of the cooling medium.

[0077] As an optional implementation, the cooling cavity further comprises a second cooling cavity, which is used to cool the heat generated by other parts (e.g., water pump, DC / DC, air compressor, etc.) in the fuel cell engine 101 when the fuel cell engine 101 is running.

[0078] The cooling module 2 comprises a first auxiliary cooling pipeline assembly 26 and a second auxiliary cooling pipeline assembly 27, which are used to provide and cool the cooling medium for the second cooling cavity, and the total amount of cooling medium that can be cooled by the first auxiliary cooling pipeline assembly 26 and the second auxiliary cooling pipeline assembly 27 is different at the same time.

[0079] It can be understood that the first auxiliary cooling pipeline assembly 26 and the second auxiliary cooling pipeline assembly 27 are connected in parallel to the second cooling cavity of the fuel cell engine 101, and the first auxiliary cooling pipeline assembly 26 or the second auxiliary cooling pipeline assembly 27 can be opened alone to cool the fuel cell engine 101 when testing the fuel cell engine 101 with small power and the fuel cell engine 101 with large power, so that the fuel cell engine 101 can be accurately cooled when using fuel cell engines 101 with different powers.

[0080] Optionally, the first auxiliary cooling pipeline assembly 26 can be responsible for cooling the fuel cell engine 101 with small power, and the second auxiliary cooling pipeline assembly 27 can be responsible for cooling the fuel cell engine 101 with large power.

[0081] It should be noted that the first auxiliary cooling pipeline assembly 26 and the second auxiliary cooling pipeline assembly 27 can have the same structure and working principle, and the structure and working principle of the second auxiliary cooling pipeline assembly 27 will not be described again.

[0082] Please refer to Figure 2 In some embodiments, the first auxiliary cooling pipeline assembly 26 comprises a first auxiliary liquid inlet pipeline 261 and a first auxiliary liquid outlet pipeline 262. The inlet end of the first auxiliary liquid inlet pipeline 261 is in communication with the outer cooling module 1, and the outlet end of the first auxiliary liquid inlet pipeline 261 is in communication with the second cooling cavity. The first auxiliary liquid inlet pipeline 261 is used to input the cooling medium from the outer cooling module 1 into the second cooling cavity.

[0083] The inlet end of the first auxiliary liquid outlet pipeline 262 is in communication with the second cooling cavity, and the outlet end of the first auxiliary liquid outlet pipeline 262 is in communication with the outer cooling module 1. The first auxiliary liquid outlet pipeline 262 is used to output the cooling medium from the second cooling cavity and input the cooling medium into the outer cooling module 1.

[0084] The first auxiliary cooling pipeline assembly 26 further comprises a first auxiliary heat exchanger 263, which is connected to the first auxiliary liquid inlet pipeline 261 and the first auxiliary liquid outlet pipeline 262. The first auxiliary heat exchanger 263 can transfer the heat in the high-temperature cooling medium flowing out of the second cooling cavity to the external environment or another cooling medium, so as to reduce the temperature of the cooling medium. The cooling medium after being reduced in temperature can flow into the outer cooling module 1 and be discharged from the fuel cell engine test bench 100 through the outer cooling module 1.

[0085] Referring to Figure 2 In some embodiments, the cooling module 2 comprises a first auxiliary valve 264 and a second auxiliary valve 274. The first auxiliary valve 264 is arranged in the first auxiliary liquid inlet pipeline 261 and is used to control the connection of the first auxiliary liquid inlet pipeline 261. The second auxiliary valve 274 is arranged in the second auxiliary liquid inlet pipeline 271 and is used to control the connection of the second auxiliary liquid inlet pipeline 271.

[0086] When the fuel cell engine test bench 100 needs to perform a small-power fuel cell engine 101 test, the first auxiliary valve 264 is opened, the second auxiliary valve 274 is closed, and the first auxiliary cooling pipeline assembly 26 is used to cool other parts in the fuel cell engine 101. When the fuel cell engine test bench 100 needs to perform a large-power fuel cell engine 101 test, the first auxiliary valve 264 is closed, the second auxiliary valve 274 is opened, and the second auxiliary cooling pipeline assembly 27 is used to cool other parts in the fuel cell engine 101.

[0087] Referring to Figure 2 As an optional embodiment, the second auxiliary cooling pipeline assembly 27 comprises a second auxiliary liquid inlet pipeline 271 and a second auxiliary liquid outlet pipeline 272. The inlet end of the second auxiliary liquid inlet pipeline 271 is connected to the outer cooling module 1, and the outlet end of the second auxiliary liquid inlet pipeline 271 is connected to the first auxiliary liquid inlet pipeline 261. The second auxiliary liquid inlet pipeline 271 is used to input the cooling medium from the outer cooling module 1 into the second cooling cavity.

[0088] The inlet end of the second auxiliary liquid outlet pipeline 272 is connected to the first auxiliary liquid outlet pipeline 262, and the outlet end of the second auxiliary liquid outlet pipeline 272 is connected to the outer cooling module 1. The second auxiliary liquid outlet pipeline 272 is used to output the cooling medium from the second cooling cavity and input the cooling medium into the outer cooling module 1.

[0089] The second auxiliary heat exchanger 273 is connected to the second auxiliary liquid inlet pipe 271 and the second auxiliary liquid outlet pipe 272, and the heat exchange power of the second auxiliary heat exchanger 273 is different from that of the second heat exchanger 223 and the first heat exchanger 213. The second auxiliary heat exchanger 273 can transfer the heat in the high-temperature cooling medium flowing out of the second cooling cavity to the external environment or another cooling medium, so as to reduce the temperature of the cooling medium. The cooling medium after being cooled can flow into the outer cooling module 1 and be discharged from the fuel cell engine test bench 100 through the outer cooling module 1.

[0090] Please refer to Figure 2 In some embodiments, the cooling module 2 comprises a first auxiliary flow meter 265 and a second auxiliary flow meter 275. The first auxiliary flow meter 265 is arranged in the first auxiliary liquid inlet pipe 261 and is located downstream of the connection between the second auxiliary liquid inlet pipe 271 and the first auxiliary liquid inlet pipe 261. The first auxiliary flow meter 265 is used to measure the flow of the cooling medium passing through the first auxiliary liquid inlet pipe 261, so as to know whether the flow of the cooling medium meets the cooling requirements of other parts in the fuel cell engine 101.

[0091] The second auxiliary flow meter 275 is arranged in the first auxiliary liquid inlet pipe 261 and is located upstream of the connection between the second auxiliary liquid inlet pipe 271 and the first auxiliary liquid inlet pipe 261. The second auxiliary flow meter 275 is used to measure the flow of the cooling medium passing through the second auxiliary liquid inlet pipe 271, so as to know whether the flow of the cooling medium meets the cooling requirements of other parts in the fuel cell engine 101.

[0092] Please refer to Figure 3 As an optional embodiment, the cooling module 2 comprises a second circulating pump 28. The second circulating pump 28 is arranged in the first auxiliary liquid outlet pipe 262 and is located upstream of the connection between the second auxiliary liquid outlet pipe 272 and the first auxiliary liquid outlet pipe 262. The second circulating pump 28 is used to provide power to the cooling medium in the first auxiliary liquid outlet pipe 262 and the second auxiliary liquid outlet pipe 272, so as to make the cooling medium flow into the outer cooling module 1 and be discharged from the outer cooling module 1. The arrangement of the second circulating pump 28 can accelerate the flow of the cooling medium and improve the flow efficiency of the cooling medium in the first auxiliary liquid outlet pipe 262 and the second auxiliary liquid outlet pipe 272.

[0093] Please refer to Figure 3 , Figure 3A structure diagram of the hydrogen supply module 3 is provided in the embodiments of the present application. In some embodiments, the hydrogen supply module 3 comprises a first gas flow meter 311 and a second gas flow meter 321, which are arranged in the first hydrogen supply pipeline 31. The first gas flow meter 311 is used to detect the flow rate of hydrogen in the first hydrogen supply pipeline 31, so as to know whether the flow rate of hydrogen in the first hydrogen supply pipeline 31 meets the energy replacement requirement of the normal operation of the fuel cell engine 101.

[0094] The second gas flow meter 321 is arranged in the second hydrogen supply pipeline 32, and is used to detect the flow rate of hydrogen in the second hydrogen supply pipeline 32, so as to know whether the flow rate of hydrogen in the second hydrogen supply pipeline 32 meets the energy replacement requirement of the normal operation of the fuel cell engine 101.

[0095] The ranges of the first gas flow meter 311 and the second gas flow meter 321 are different, and the range of the second gas flow meter 321 is greater than that of the first gas flow meter 311. Therefore, the first gas flow meter 311 and the second gas flow meter 321 can measure the flow rate of hydrogen for fuel cell engines 101 with different powers, thereby enhancing the accuracy of hydrogen flow rate measurement and making the control of hydrogen flow more accurate.

[0096] Please refer to Figure 3 In some embodiments, the hydrogen supply module 3 comprises a pressure reducing valve 33 arranged in the first hydrogen supply pipeline 31. The pressure reducing valve 33 plays a role of reducing the pressure of hydrogen in the hydrogen supply module 3, so as to ensure that the gas pressure of hydrogen is kept within a safe pressure range during the delivery process. The pressure reducing valve 33 is located upstream of the connection between the first hydrogen supply pipeline 31 and the second hydrogen supply pipeline 32. Before the hydrogen in the first hydrogen supply pipeline 31 flows into the connection point between the first hydrogen supply pipeline 31 and the second hydrogen supply pipeline 32, the hydrogen will first pass through the pressure reducing valve 33 for pressure adjustment, so as to prevent the hydrogen pressure from being too high to cause damage to the equipment or safety problems.

[0097] Please refer to Figure 2 As an optional implementation, the hydrogen supply module 3 comprises a first hydrogen supply valve 312 arranged in the first hydrogen supply pipeline 31, and a second hydrogen supply valve 322 arranged in the second hydrogen supply pipeline 32.

[0098] When the fuel cell engine test bench 100 needs to carry out a small-power fuel cell engine 101 test, the first hydrogen supply valve 312 is opened, the second hydrogen supply valve 322 is closed, and the first hydrogen supply pipeline 31 is used to transport the hydrogen required by the fuel cell engine 101. When the fuel cell engine test bench 100 needs to carry out a large-power fuel cell engine 101 test, the first hydrogen supply valve 312 is closed, the second hydrogen supply valve 322 is opened, and the second hydrogen supply pipeline 32 is used to transport the hydrogen required by the fuel cell engine 101.

[0099] Please refer to the Figure 4 In some embodiments, the external cooling module 1 comprises an external cooling inlet pipeline 11 and an external cooling outlet pipeline 12. The inlet end of the external cooling inlet pipeline 11 is used to communicate with an external cooling source, and the outlet end of the external cooling inlet pipeline 11 communicates with the cooling module 2. The external cooling inlet pipeline 11 is used to input the cooling medium from the external cooling source into the cooling module 2.

[0100] The inlet end of the external cooling outlet pipeline 12 communicates with the cooling module 2. The external cooling outlet pipeline 12 is used to output the cooling medium from the cooling module 2 and discharge the fuel cell engine test bench 100.

[0101] The external cooling module 1 further comprises an external cooling heat exchanger 13, which communicates with the external cooling inlet pipeline 11 and the external cooling outlet pipeline 12. The external cooling heat exchanger 13 can transfer the heat in the cooling medium flowing out of the cooling module 2 to the external environment or another cooling medium, thereby secondary cooling the cooling medium. The cooled cooling medium can be discharged from the fuel cell engine test bench 100.

[0102] In some embodiments, the external cooling module 1 comprises an adjusting pump, which is arranged in the external cooling inlet pipeline 11. The adjusting pump is used to adjust the flow of the cooling medium transported by the external cooling inlet pipeline 11, thereby adjusting the flow of the cooling medium input into the cooling module 2 by the external cooling inlet pipeline 11. According to different powers of the fuel engine, different rotating speeds of the adjusting pump can be selected, so that the flow of the cooling medium entering the cooling module 2 is different.

[0103] In addition, when the required cooling medium flow cannot be achieved by only adjusting the rotating speed of the adjusting pump, an adjusting valve can be arranged in the external cooling inlet pipeline 11 to assist in adjusting the flow of the cooling medium.

[0104] For example, Figure 4 For example, ​ The simple flowchart of the operation method of the fuel cell engine test bench 100 provided by the embodiments of the present application is shown in the figure. The use process of the fuel cell engine test bench 100 generally comprises the following steps:

[0105] Step S1: setting the power of the fuel cell engine 101 to be tested on the control system;

[0106] Step S21: if the power of the fuel cell engine 101 to be set is in the power range of 50-250KW, the system sets the small-range power range loop to start;

[0107] Step S31: the first cooling pipe assembly 21, the first hydrogen supply pipe 31 and the first auxiliary cooling pipe are operated;

[0108] Step S22: if the power of the fuel cell engine 101 to be set is in the power range of 250-500KW, the system sets the large-range power range loop to start;

[0109] Step S32: the second cooling pipe assembly 22, the second hydrogen supply pipe 32 and the second auxiliary cooling pipe are operated.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A fuel cell engine test stand characterized by, The application relates to a fuel cell engine cooling system, comprising: an outer cooling module for connecting with an external cooling source, the outer cooling module being capable of adjusting the flow of a cooling medium; a cooling module, a first end of the cooling module being used for connecting with a cooling cavity of a fuel cell engine, a second end of the cooling module being used for connecting with the outer cooling module, the cooling module comprising a first cooling pipeline assembly and a second cooling pipeline assembly, the first cooling pipeline assembly and the second cooling pipeline assembly being used for providing and cooling the cooling medium to the cooling cavity, the first cooling pipeline assembly and the second cooling pipeline assembly being capable of cooling different total amounts of the cooling medium in the same time; a hydrogen supply module for simulating hydrogen supply, the hydrogen supply module being connected with an air inlet of the fuel cell engine, the hydrogen supply module comprising a first hydrogen supply pipeline, a second hydrogen supply pipeline and a hydrogen source, the first hydrogen supply pipeline and the second hydrogen supply pipeline being connected with the hydrogen source, the first hydrogen supply pipeline and the second hydrogen supply pipeline being capable of providing different total amounts of the hydrogen in the same time.

2. The fuel cell engine test stand of claim 1, wherein, The cooling cavity comprises a first cooling cavity, and the first cooling pipeline assembly comprises: a first liquid inlet pipeline, an inlet end of the first liquid inlet pipeline being connected with the outer cooling module, an outlet end of the first liquid inlet pipeline being connected with the first cooling cavity; a first liquid outlet pipeline, an inlet end of the first liquid outlet pipeline being connected with the first cooling cavity, an outlet end of the first liquid outlet pipeline being connected with the outer cooling module; a first heat exchanger, the first heat exchanger being connected with the first liquid inlet pipeline and the first liquid outlet pipeline.

3. The fuel cell engine test stand of claim 2, wherein, The first cooling pipeline assembly comprises: a first connecting pipeline, one end of the first connecting pipeline being connected with the first liquid inlet pipeline, the other end of the first connecting pipeline being connected with the first liquid outlet pipeline.

4. The fuel cell engine test stand of claim 2, wherein, The cooling module comprises: a first flow meter, the first flow meter being arranged in the first liquid inlet pipeline and being used for detecting the flow of the cooling medium in the first liquid inlet pipeline.

5. The fuel cell engine test stand of claim 3, wherein, The cooling module comprises: a first three-way flow dividing valve, a first interface and a second interface of the first three-way flow dividing valve being connected with the first liquid inlet pipeline respectively, a third interface of the first three-way flow dividing valve being connected with the first connecting pipeline.

6. The fuel cell engine test stand of claim 3, wherein, The cooling module comprises: a first switch valve, the first switch valve being arranged in the first connecting pipeline and being used for controlling the connection of the first connecting pipeline.

7. The fuel cell engine test stand of claim 2, wherein, The second cooling pipeline assembly comprises: a second liquid inlet pipeline, an inlet end of the second liquid inlet pipeline being connected with the outer cooling module, an outlet end of the second liquid inlet pipeline being connected with the first cooling cavity; a second liquid outlet pipeline, an inlet end of the second liquid outlet pipeline being connected with the first cooling cavity, an outlet end of the second liquid outlet pipeline being connected with the first liquid outlet pipeline; a second heat exchanger, the second heat exchanger being connected with the second liquid inlet pipeline and the second liquid outlet pipeline, the second heat exchanger and the first heat exchanger having different heat exchange powers.

8. The fuel cell engine test stand of claim 7, wherein, The cooling module comprises: A buffer water tank is arranged in the first liquid outlet pipeline, and is located downstream of the connection between the first liquid outlet pipeline and the second liquid outlet pipeline.

9. The fuel cell engine test stand of claim 8, wherein, The cooling module comprises: A liquid level switch is arranged in the buffer water tank, and is capable of detecting the liquid level in the buffer water tank.

10. The fuel cell engine test stand of claim 9, wherein, The cooling module comprises: A first circulating pump is arranged in the first liquid outlet pipeline, is located downstream of the connection between the first liquid outlet pipeline and the second liquid outlet pipeline, and is used to drive the cooling medium to flow to the external cooling module.

11. The fuel cell engine test stand of claim 2, wherein, The cooling cavity further comprises a second cooling cavity, and the cooling module comprises: A first auxiliary cooling pipeline assembly and a second auxiliary cooling pipeline assembly are used to provide cooling medium to the second cooling cavity and cool the cooling medium, and the first auxiliary cooling pipeline assembly and the second auxiliary cooling pipeline assembly are capable of cooling different total amounts of the cooling medium in the same time.

12. The fuel cell engine test stand of claim 11, wherein, The first auxiliary cooling pipeline assembly comprises: A first auxiliary liquid inlet pipeline, an inlet end of which is in communication with the external cooling module, and an outlet end of which is in communication with the second cooling cavity; A first auxiliary liquid outlet pipeline, an inlet end of which is in communication with the second cooling cavity, and an outlet end of which is in communication with the external cooling module; A first auxiliary heat exchanger, which is in communication with the first auxiliary liquid inlet pipeline and the first auxiliary liquid outlet pipeline.

13. The fuel cell engine test stand of claim 12, wherein, The second auxiliary cooling pipeline assembly comprises: A second auxiliary liquid inlet pipeline, an inlet end of which is in communication with the external cooling module, and an outlet end of which is in communication with the first auxiliary liquid inlet pipeline; A second auxiliary liquid outlet pipeline, an inlet end of which is in communication with the first auxiliary liquid outlet pipeline, and an outlet end of which is in communication with the external cooling module; A second auxiliary heat exchanger, which is in communication with the second auxiliary liquid inlet pipeline and the second auxiliary liquid outlet pipeline, and has different heat exchange power from the first auxiliary heat exchanger.

14. The fuel cell engine test stand of claim 13, wherein, The cooling module comprises: A first auxiliary valve is arranged in the first auxiliary liquid inlet pipeline, and is used to control the communication of the first auxiliary liquid inlet pipeline; A second auxiliary valve is arranged in the second auxiliary liquid inlet pipeline, and is used to control the communication of the second auxiliary liquid inlet pipeline.

15. The fuel cell engine test stand of claim 14, wherein, The cooling module comprises: A first auxiliary flow meter is arranged in the first auxiliary liquid inlet pipeline, and is located downstream of the connection between the second auxiliary liquid inlet pipeline and the first auxiliary liquid inlet pipeline; A second auxiliary flow meter is arranged in the first auxiliary liquid inlet pipeline, and is located upstream of the connection between the second auxiliary liquid inlet pipeline and the first auxiliary liquid inlet pipeline.

16. The fuel cell engine test stand of claim 15, wherein, The cooling module comprises: A second circulating pump is arranged in the first auxiliary liquid outlet pipeline, and is located upstream of the connection between the second auxiliary liquid outlet pipeline and the first auxiliary liquid outlet pipeline.

17. The fuel cell engine test stand of claim 1, wherein, The hydrogen supply module comprises: A first gas flow meter is arranged in the first hydrogen supply pipeline, and is used to detect the flow of hydrogen in the first hydrogen supply pipeline. A second gas flow meter is arranged in the second hydrogen supply pipeline, and is used to detect the flow of hydrogen in the second hydrogen supply pipeline.

18. The fuel cell engine test stand of claim 17, wherein, The hydrogen supply module comprises: A pressure reducing valve is arranged in the first hydrogen supply pipeline, and is located upstream of the connection between the first hydrogen supply pipeline and the second hydrogen supply pipeline.

19. The fuel cell engine test stand of claim 17, wherein, The hydrogen supply module comprises: A first hydrogen supply valve is arranged in the first hydrogen supply pipeline, and is located downstream of the connection between the first hydrogen supply pipeline and the second hydrogen supply pipeline. A second hydrogen supply valve is arranged in the second hydrogen supply pipeline.

20. The fuel cell engine test stand of claim 1, wherein, The external cooling module comprises: An external cooling liquid inlet pipeline, an inlet end of which is used to communicate with the external cooling source, and an outlet end of which communicates with the cooling module; An external cooling liquid outlet pipeline, an inlet end of which communicates with the cooling module; An external cooling heat exchanger, which communicates with the external cooling liquid inlet pipeline and the external cooling liquid outlet pipeline.

21. The fuel cell engine test stand of claim 20, wherein, The external cooling module comprises: An adjusting pump is arranged in the external cooling liquid inlet pipeline, and is used to adjust the flow of cooling medium delivered by the external cooling liquid inlet pipeline.

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