Electric pile temperature control method and device, storage medium and electronic equipment

Abstract

The invention discloses a pile temperature control method and device, a storage medium and electronic equipment. The method comprises the steps that the cooling liquid temperature of cooling liquid, the cooling water pump rotating speed of a cooling water pump and the thermostat opening degree of a thermostat are obtained; a target relation is determined based on the cooling liquid temperature, the cooling water pump rotating speed and the thermostat opening degree through an online identification algorithm; based on the target relationship, determining the target thermostat opening degree of the thermostat according to the pile temperature target value and the cooling liquid temperature and the cooling water pump rotating speed which are obtained in real time at present; and controlling the thermostat based on the target thermostat opening degree so as to control the ratio of the flow of the cooling liquid, and further controlling the temperature of the cooling liquid at an electric pile inlet, so that the electric pile temperature is kept at the electric pile temperature target value. The technical problem that the temperature stability of the galvanic pile is poor is solved.

Description

Technical Field

[0001] The present invention relates to the field of fuel cells, and in particular, to a method and device for controlling the temperature of a fuel cell stack, a storage medium, and an electronic device. Background Art

[0002] Currently, the temperature of the fuel cell stack is one of the important topics in current battery research. An excessively high or low temperature of the fuel cell stack may cause a decline in the performance of the fuel cell stack or even damage the fuel cell stack. And a thermostat is a three-way valve whose opening can be controlled, and it can control the flow ratio of the high-temperature coolant at the outlet of the fuel cell stack and the low-temperature coolant passing through the radiator fan according to the opening of the thermostat, so as to control the temperature of the fuel cell stack.

[0003] However, the traditional method for controlling the temperature of the fuel cell stack is to measure and calculate the opening of the thermostat through an offline test bench, and then control the temperature of the fuel cell stack according to the opening of the thermostat. The fuel cell stack thermal management system controls the opening of the thermostat in real time according to the temperature of the fuel cell stack. The control principles of the offline test bench and the fuel cell stack thermal management system are different. Therefore, using the offline test bench to control the fuel cell stack thermal management system will cause the opening of the thermostat to oscillate and fluctuate repeatedly, resulting in the temperature of the coolant at the inlet of the fuel cell stack oscillating and fluctuating repeatedly, and further leading to poor stability of the temperature of the fuel cell stack.

[0004] In view of the above problems, no effective solution has been proposed yet. Summary of the Invention

[0005] Embodiments of the present invention provide a method and device for controlling the temperature of a fuel cell stack, a storage medium, and an electronic device, so as to solve at least the technical problem of poor stability of the temperature of the fuel cell stack.

[0006] According to one aspect of the embodiments of the present invention, a method for controlling the temperature of a fuel cell stack is provided, including: obtaining the coolant temperature of the coolant, the cooling water pump speed of the cooling water pump, and the thermostat opening of the thermostat, wherein the coolant is used to cool the fuel cell stack, the cooling water pump is used to control the flow rate of the coolant, and the thermostat is used to control the flow ratio of the high-temperature and low-temperature coolants, and the high-temperature and low-temperature coolants are coolants with a temperature difference formed at the inlet and outlet of the fuel cell stack; using an online identification algorithm to determine a target relationship based on the coolant temperature, the cooling water pump speed, and the thermostat opening, wherein the target relationship is the correlation relationship between the coolant temperature, the cooling water pump speed, and the thermostat opening; determining the target thermostat opening of the thermostat based on the coolant temperature, the cooling water pump speed, the target relationship, and the preset temperature of the fuel cell stack; and controlling the thermostat based on the target thermostat opening.

[0007] Optionally, the coolant temperature includes: the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator fan. An online identification algorithm is used to determine the target relationship based on the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat, including: determining the ratio of the high-temperature and low-temperature coolant flow rates based on the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator fan; using the least squares algorithm with a forgetting factor to recursively calculate the ratio of the coolant flow rates, the rotational speed of the coolant pump, and the opening degree of the thermostat to obtain the initial relationship; and using the online identification algorithm to update and iterate the initial relationship to determine the target relationship.

[0008] Optionally, determining the ratio of the high-temperature and low-temperature coolant flow rates based on the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator fan includes: obtaining the difference between the coolant temperature at the inlet of the fuel cell stack and the coolant temperature at the outlet of the radiator fan to obtain a first difference; obtaining the difference between the coolant temperature at the outlet of the fuel cell stack and the coolant temperature at the outlet of the radiator fan to obtain a second difference; and obtaining the ratio of the first difference to the second difference to obtain the ratio of the high-temperature and low-temperature coolant flow rates.

[0009] Optionally, using the least squares algorithm with a forgetting factor to recursively calculate the ratio of the coolant flow rates, the rotational speed of the coolant pump, and the opening degree of the thermostat to determine the initial relationship includes: determining the number of historical data and the number of new data, where the number of historical data is the number of the ratio of the coolant flow rates, the rotational speed of the coolant pump, and the opening degree of the thermostat obtained within a historical time period, and the number of new data is the number of the ratio of the coolant flow rates, the rotational speed of the coolant pump, and the opening degree of the thermostat obtained within the current time period; obtaining the ratio of the number of historical data to the number of new data to obtain a first ratio; determining the value of the forgetting factor based on the first ratio; and using the least squares method to recursively calculate the ratio of the coolant flow rates, the rotational speed of the coolant pump, and the opening degree of the thermostat based on the value of the forgetting factor to determine the initial relationship.

[0010] Optionally, determining the value of the forgetting factor based on the first ratio includes: determining whether the first ratio is greater than or equal to a preset threshold; in response to the first ratio being greater than or equal to the preset threshold, determining the value of the forgetting factor as a first value; and in response to the first ratio being less than the preset threshold, determining the value of the forgetting factor as a second value, where the second value is greater than or equal to the first value.

[0011] Optionally, the coolant temperature includes: the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator fan. Determining the target thermostat opening based on the coolant temperature, the rotational speed of the coolant pump, the target relationship, and the preset temperature of the fuel cell stack includes: determining the target coolant temperature at the inlet of the fuel cell stack, where the target coolant temperature at the inlet of the fuel cell stack is the coolant temperature at the inlet of the fuel cell stack when the temperature of the fuel cell stack is controlled to the preset temperature; comparing the target coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, the coolant temperature at the outlet of the radiator fan, and the rotational speed of the coolant pump with the target relationship to determine the target thermostat opening corresponding to the target coolant temperature at the inlet of the fuel cell stack and the rotational speed of the coolant pump.

[0012] Optionally, determining the target thermostat opening based on the coolant temperature, the rotational speed of the coolant pump, the target relationship, and the preset temperature of the fuel cell stack, the method further includes: determining the target coolant temperature at the inlet of the fuel cell stack and the target coolant temperature at the outlet of the fuel cell stack based on the coolant temperature and the rotational speed of the coolant pump; using an opening algorithm to determine the target thermostat opening based on the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, the coolant temperature, and the rotational speed of the coolant pump, where the opening algorithm is an algorithm for characterizing the relationship between the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, the rotational speed of the coolant pump, and the target thermostat opening.

[0013] Optionally, controlling the thermostat based on the target thermostat opening includes: obtaining a control signal corresponding to the target thermostat opening; controlling the opening of the thermostat according to the control signal so that the temperature of the fuel cell stack is the preset temperature.

[0014] According to another aspect of the embodiments of the present invention, there is also provided a control device for the temperature of a fuel cell stack, including: an acquisition module, configured to acquire the coolant temperature of the coolant, the rotational speed of the coolant pump of the coolant pump, and the opening of the thermostat of the thermostat, where the coolant is used to cool down the fuel cell stack, the coolant pump is used to control the flow rate of the coolant, and the thermostat is used to control the ratio of the high-temperature and low-temperature coolant flow rates, and the high-temperature and low-temperature coolant are coolants with a temperature difference formed at the inlet and outlet of the fuel cell stack; a first determination module, configured to use an online identification algorithm to determine a target relationship based on the coolant temperature, the rotational speed of the coolant pump, and the opening of the thermostat, where the target relationship is the correlation relationship between the coolant temperature, the rotational speed of the coolant pump, and the opening of the thermostat; a second determination module, configured to determine the target thermostat opening of the thermostat based on the coolant temperature, the rotational speed of the coolant pump, the target relationship, and the preset temperature of the fuel cell stack; and a control module, configured to control the thermostat based on the target thermostat opening.

[0015] According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, where the computer-readable storage medium includes a stored program, and when the program runs, it controls the processor of the device where it is located to execute the control method for the temperature of the fuel cell stack in any one of the above embodiments.

[0016] According to another aspect of the embodiments of the present invention, an electronic device is further provided, including: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors execute the control method for the stack temperature in any one of the above embodiments.

[0017] In the embodiments of the present invention, the coolant temperature of the coolant, the rotational speed of the coolant pump, and the opening degree of the thermostat are obtained, where the coolant temperature of the coolant includes the coolant temperature in the first heat pipe circuit and the coolant temperature in the second heat pipe circuit; an online identification algorithm is used to determine a target relationship based on the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat, where the target relationship is the correlation relationship between the opening degree of the thermostat and the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat; based on the target relationship, the target opening degree of the thermostat is determined according to the stack temperature target value and the currently real-time obtained coolant temperature and the rotational speed of the coolant pump; the thermostat is controlled based on the target opening degree of the thermostat to control the ratio of the coolant flow rate, and further control the coolant temperature at the stack inlet so that the stack temperature is maintained at the stack temperature target value. It should be noted that using the online identification algorithm to determine the target relationship based on the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat can reflect the relationship between the opening degree of the thermostat and the coolant temperature and the rotational speed of the coolant pump in real time and accurately. Furthermore, the target opening degree of the thermostat determined according to the coolant temperature, the rotational speed of the coolant pump, and the target relationship can accurately control the stack temperature to the preset temperature, avoid the problem of repeated fluctuations in the stack temperature, achieve the purpose of improving the stability of the stack temperature, thus realizing the technical effect of accurately controlling the opening degree of the thermostat, and further solving the technical problem of poor stability of the stack temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 is a flowchart of a control method for the stack temperature according to an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of an optional stack thermal management system according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of an optional method for obtaining the opening degree of the thermostat based on the online identification algorithm according to this embodiment;

[0022] Figure 4It is a flowchart of an optional fuel cell stack temperature control method according to an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of a control device for the fuel cell stack temperature according to an embodiment of the present invention. Detailed implementation manners

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] Embodiment 1

[0027] According to an embodiment of the present invention, an embodiment of a method for controlling the fuel cell stack temperature is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0028] Figure 1 It is a flowchart of the method for controlling the fuel cell stack temperature according to an embodiment of the present invention, as Figure 1As shown, the inlet of the fuel cell stack is connected to the output end of the coolant pump, the outlet of the fuel cell stack is connected to the inlet of the thermostat, the first outlet of the thermostat is connected to the input end of the coolant pump, the second outlet of the thermostat is connected to the input port of the radiator, and the output port of the radiator is connected to the input end of the coolant pump. The coolant can flow through the coolant pump, the fuel cell stack, the thermostat in sequence and then flow back into the coolant pump to form a first heat pipeline loop. The coolant can flow through the coolant pump, the fuel cell stack, the thermostat, the radiator in sequence and then flow back into the coolant pump to form a second heat pipeline loop. The thermostat is used to control the ratio of the coolant flow rate flowing into the inlet of the thermostat to the coolant flow rate flowing out of the second outlet of the thermostat. The method includes the following steps:

[0029] Step S102, obtain the coolant temperature of the coolant, the rotational speed of the coolant pump of the coolant pump, and the opening degree of the thermostat of the thermostat, where the coolant temperature of the coolant includes the coolant temperature in the first heat pipeline loop and the coolant temperature in the second heat pipeline loop.

[0030] The above-mentioned coolant can be a liquid used to reduce the temperature of the fuel cell stack. The coolant pump can be a pump used to circulate and transport the coolant to the vicinity of the fuel cell stack. The thermostat can be a device used to control the temperature of the fuel cell stack, which can be, but is not limited to: a three-way valve.

[0031] The above-mentioned coolant temperature can be the current temperature of the coolant, including but not limited to: the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator fan. Among them, the coolant temperature at the inlet of the fuel cell stack can be the temperature at which the coolant flows into the fuel cell stack in the coolant circulation path, the coolant temperature at the outlet of the fuel cell stack can be the temperature at which the coolant flows out of the fuel cell stack in the coolant circulation path, and the coolant temperature at the outlet of the radiator fan can be the temperature at which the coolant flows out of the radiator in the coolant circulation path.

[0032] The above-mentioned rotational speed of the coolant pump can be the current rotational speed of the coolant pump.

[0033] The above-mentioned opening degree of the thermostat can be the position or angle of the regulating valve of the thermostat, which is used to control the coolant flow rate.

[0034] The above-mentioned coolant flow rate ratio can be the flow rate ratio of the high-temperature coolant to the low-temperature coolant during the process of the coolant flowing through the fuel cell stack.

[0035] In an alternative embodiment, the coolant temperature of the coolant, the rotational speed of the coolant pump, and the opening degree of the thermostat are obtained in real time through a temperature sensor, acquisition software, and monitoring software. Among them, the acquisition software can be software such as LabVIEW (a graphical programming environment and development platform for measuring and monitoring data), MATLAB (a software for data analysis and data processing), etc., which can collect the coolant temperature of the coolant, the rotational speed of the coolant pump, and the opening degree of the thermostat through a data acquisition card.

[0036] Step S104, using an online identification algorithm, based on the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat, determine the target relationship, where the target relationship is the correlation between the opening degree of the thermostat and the coolant temperature and the rotational speed of the coolant pump.

[0037] The above-mentioned online identification algorithm can be an algorithm for continuously updating and iterating the relationship among the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat.

[0038] In an alternative embodiment, using the least squares algorithm to recursively process the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat to obtain the relationship among the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat, and using the online identification algorithm to continuously update and iterate the relationship among the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat to obtain the target relationship, which can timely obtain the latest relationship between the opening degree of the thermostat and the coolant temperature and the rotational speed of the coolant pump. The target relationship determines the stack temperature.

[0039] In another alternative embodiment, using the online identification algorithm to continuously update and iterate data such as the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat to obtain updated data, where the updated data can be the latest data of the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat. Using the least squares algorithm or other arithmetic algorithms to recursively process the updated data to obtain the target relationship.

[0040] Step S106, based on the target relationship, determine the target opening degree of the thermostat according to the target value of the stack temperature and the currently real-time obtained coolant temperature and the rotational speed of the coolant pump.

[0041] The above-mentioned target value of the stack temperature can be the stack safe operating temperature set in advance according to specific circumstances, which can be but is not limited to: 5°C, 10°C.

[0042] The above-mentioned stack can be a device that converts chemical energy into electrical energy and is used to generate continuous electrical energy output.

[0043] The above-mentioned target opening degree of the thermostat can be used to control the opening degree of the thermostat.

[0044] In an alternative embodiment, a target value of the stack temperature is determined, the current real-time coolant temperature and the rotational speed of the coolant pump are obtained, and the coolant temperature, the rotational speed of the coolant pump, and the target value of the stack temperature are compared with a target relationship to determine a target thermostat opening degree.

[0045] In another alternative embodiment, a target coolant temperature at the stack inlet is determined, where the target coolant temperature at the stack inlet may be the coolant temperature at the stack inlet for cooling the stack. The current coolant temperature and the rotational speed of the coolant pump are obtained, and the target coolant temperature at the stack inlet, the coolant temperature, and the rotational speed of the coolant pump are compared with a target relationship to determine a target thermostat opening degree that can meet the conditions of the target coolant temperature at the stack inlet and the rotational speed of the coolant pump and keep the stack temperature at a preset temperature. Thereby, the stack temperature is maintained within a safe range to ensure the normal and safe operation of the stack.

[0046] Step S108 controls the thermostat based on the target thermostat opening degree to control the ratio of the coolant flow rate, and further controls the coolant temperature at the stack inlet so as to keep the stack temperature at the target value of the stack temperature.

[0047] In an alternative embodiment, the target thermostat opening degree is sent to a control system, where the control system may be a system that controls the switches of various devices in the stack thermal management system. The control system determines a control instruction according to the target thermostat opening degree and sends the control instruction to the thermostat, and the thermostat controls the opening degree according to the control instruction to adjust the stack temperature.

[0048] Through the above steps, it is possible to obtain the coolant temperature of the coolant, the rotational speed of the coolant pump of the coolant pump, and the thermostat opening of the thermostat. Among them, the coolant temperature of the coolant includes the coolant temperature in the first hot pipeline circuit and the coolant temperature in the second hot pipeline circuit. Using an online identification algorithm, based on the coolant temperature, the rotational speed of the coolant pump, and the thermostat opening, a target relationship is determined. The target relationship is the correlation relationship between the thermostat opening, the coolant temperature, the rotational speed of the coolant pump, and the thermostat opening. Based on the target relationship, according to the target value of the stack temperature and the currently real-time obtained coolant temperature and the rotational speed of the coolant pump, the target thermostat opening of the thermostat is determined. Based on the target thermostat opening, the thermostat is controlled to control the ratio of the coolant flow rate, and further control the coolant temperature at the stack inlet so that the stack temperature is maintained at the target value of the stack temperature. It should be noted that using the online identification algorithm to determine the target relationship based on the coolant temperature, the rotational speed of the coolant pump, and the thermostat opening can reflect the relationship between the thermostat opening, the coolant temperature, and the rotational speed of the coolant pump in real time and accurately. Furthermore, the target thermostat opening determined according to the coolant temperature, the rotational speed of the coolant pump, and the target relationship can accurately control the stack temperature to the preset temperature, avoid the problem of repeated fluctuations in the stack temperature, achieve the purpose of improving the stability of the stack temperature, thus realizing the technical effect of accurately controlling the thermostat opening, and further solving the technical problem of poor stability of the stack temperature.

[0049] Among them, Figure 2 is a schematic diagram of an optional stack thermal management system according to an embodiment of the present invention, as Figure 2As shown, the fuel cell stack thermal management system includes an expansion tank, a fan, a radiator, a coolant temperature sensor at the radiator outlet, a thermostat, a coolant pump, a fuel cell stack, a coolant temperature sensor at the fuel cell stack inlet, and a coolant temperature sensor at the fuel cell stack outlet. Among them, the coolant flows through the inlet of the coolant pump, the outlet of the coolant pump, the coolant pump system, the coolant pump flow rate, and the coolant pump driver in sequence, and then returns to the inlet of the coolant pump to form a coolant pump flow rate control loop. Among them, the coolant pump system controls the coolant pump driver, the high-temperature coolant return of the coolant pump, and the coolant pump. The coolant pump flow rate is used to detect the flow rate of the coolant in the coolant pump, and the flow rate level of the coolant pump can be represented by CFM_L1 (CFM is the unit of cubic feet per minute, and L1 represents flow rate level 1). The expansion tank is used to store the coolant, and is connected to the inlet of the radiator to form a first coolant recovery loop, and is connected to the line between the coolant pump driver and the high-temperature coolant return of the coolant pump to form a second coolant recovery loop, which is used to maintain the pressure of the fuel cell stack thermal management system. The radiator is generally a shell-and-tube or finned heat exchanger, which is used as a carrier for convective heat transfer between the high-temperature coolant and the fan. The fan is used to cool the high-temperature coolant flowing through the radiator and reduce the coolant temperature. And a coolant temperature sensor at the radiator outlet is provided to obtain the coolant temperature at the radiator outlet. The thermostat is a three-way valve with adjustable opening. The first outlet of the thermostat is connected to the input end of the coolant pump, the second outlet of the thermostat is connected to the input port of the radiator, and the output port of the radiator is connected to the input end of the coolant pump. The coolant can flow through the coolant pump, the fuel cell stack, the thermostat in sequence and then return to the coolant pump to form a first heat pipeline loop. The coolant can flow through the coolant pump, the fuel cell stack, the thermostat, the radiator in sequence and then return to the coolant pump to form a second heat pipeline loop. The fuel cell stack is used to convert chemical energy into electrical energy and provide electrical energy, and can be composed of fuel cells. A coolant temperature sensor at the fuel cell stack inlet and a coolant temperature sensor at the fuel cell stack outlet are provided. The coolant temperature sensor at the fuel cell stack inlet is used to obtain the coolant temperature at the fuel cell stack inlet, and the coolant temperature sensor at the fuel cell stack outlet is used to obtain the coolant temperature at the fuel cell stack outlet.

[0050] Optionally, the coolant temperature includes: the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator. The inlet of the fuel cell stack is also connected to a coolant temperature sensor at the inlet of the fuel cell stack, the outlet of the fuel cell stack is also connected to a coolant temperature sensor at the outlet of the fuel cell stack, and the output of the radiator is also connected to a coolant temperature sensor at the outlet of the radiator. The coolant temperature sensor at the inlet of the fuel cell stack is used to obtain the coolant temperature at the inlet of the fuel cell stack, the coolant temperature sensor at the outlet of the fuel cell stack is used to obtain the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature sensor at the outlet of the radiator is used to obtain the coolant temperature at the outlet of the radiator. An online identification algorithm is used to determine the target relationship based on the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat, including: determining the ratio of the coolant flow rate based on the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator; using the least squares algorithm with a forgetting factor to recursively calculate the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat to obtain the initial relationship; and using the online identification algorithm to update and iterate the initial relationship to determine the target relationship.

[0051] The above forgetting factor can be a numerical value describing the data forgetting speed and is used to adjust the numerical value of the data weight.

[0052] The above least squares algorithm can be a mathematical optimization algorithm.

[0053] The above initial relationship can be the relationship among the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat that has not been updated and iterated.

[0054] In an optional embodiment, the ratio of the coolant flow rate is determined based on the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator; the least squares algorithm is used to recursively calculate the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat, and the data such as the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat are constrained by the forgetting factor. The forgetting factor is used to adjust the weight between the historical data and the new data of the data such as the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat according to the specific situation to obtain the initial relationship, so as to avoid the influence of external factors or internal component aging on the change of the target relationship. Then, the online identification algorithm is used to iterate the initial relationship until the initial relationship corresponds to the control parameters of the coolant pump, thermostat and other devices in the fuel cell thermal management system, and the corresponding relationship among the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat is output as the target relationship.

[0055] Among them, in this embodiment, Figure 3 is a schematic diagram of an optional method for obtaining the opening degree of the thermostat based on the online identification algorithm according to this embodiment, as Figure 3As shown, based on the coolant temperature at the inlet of the stack, the coolant temperature at the outlet of the stack, and the coolant temperature at the outlet of the radiator, determine the ratio of the coolant flow rate, and further obtain the latest data of the thermostat opening and the cooling water pump speed. Then, use the least squares algorithm with a forgetting factor to recursively calculate the ratio of the coolant flow rate, the cooling water pump speed, and the thermostat opening, and use the online identification algorithm to iterate the recursive results to determine the target relationship. Thus, based on the target relationship, the coolant temperature at the outlet of the stack, the coolant temperature at the outlet of the radiator, the target coolant temperature at the inlet of the stack, and the cooling water pump speed, determine the target thermostat opening.

[0056] In another alternative embodiment, based on the coolant temperature at the inlet of the stack, the coolant temperature at the outlet of the stack, and the coolant temperature at the outlet of the radiator, determine the heat dissipation efficiency of the coolant. Further, use the least squares method to recursively calculate the heat dissipation efficiency, the cooling water pump speed, and the thermostat opening, and use the online identification algorithm to iterate the recursive results to obtain the relationship among the heat dissipation efficiency, the cooling water pump speed, and the thermostat opening. Then, use the relationship among the heat dissipation efficiency, the cooling water pump speed, and the thermostat opening to obtain the target thermostat opening, thereby controlling the stack temperature according to the target thermostat opening.

[0057] Optionally, based on the coolant temperature at the inlet of the stack, the coolant temperature at the outlet of the stack, and the coolant temperature at the outlet of the radiator, determine the ratio of the high-temperature and low-temperature coolant flow rates, including: obtaining the difference between the coolant temperature at the inlet of the stack and the coolant temperature at the outlet of the radiator to get the first difference; obtaining the difference between the coolant temperature at the outlet of the stack and the coolant temperature at the outlet of the radiator to get the second difference; obtaining the ratio of the first difference to the second difference to get the ratio of the coolant flow rate.

[0058] In an alternative embodiment, obtain the temperature difference between the coolant temperature at the inlet of the stack and the coolant temperature at the outlet of the radiator as the first difference, and the temperature difference between the coolant temperature at the outlet of the stack and the coolant temperature at the outlet of the radiator as the second difference, and determine the ratio of the coolant flow rate according to the following formula.

[0059]

[0060] Wherein, CTE12 is the coolant temperature at the inlet of the stack, CTE11 is the coolant temperature at the outlet of the radiator, CTE21 is the coolant temperature at the outlet of the stack, and A is the ratio of the coolant flow rate.

[0061] Optionally, the least squares algorithm with a forgetting factor is used to recursively calculate the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat to determine the initial relationship, including: determining the number of historical data and the number of new data, where the number of historical data is the number of ratios of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat obtained within the historical time period, and the number of new data is the number of ratios of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat obtained within the current time period; obtaining the ratio of the number of historical data to the number of new data to get the first ratio; determining the value of the forgetting factor based on the first ratio; and using the least squares method to recursively calculate the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat based on the value of the forgetting factor to determine the initial relationship.

[0062] The above value of the forgetting factor can be the value of the forgetting factor, and can be, but is not limited to, a value between [0, 1].

[0063] In an alternative embodiment, historical data and new data are retrieved from the stack thermal management system, the number of historical data and the number of new data are determined, the ratio of the number of historical data to the number of new data is calculated to determine the proportion between the historical data and the new data to obtain the first ratio, and based on the first ratio, the value of the forgetting factor is determined. The value of the forgetting factor is used to control the proportion of the historical data in the calculation process to avoid problems such as external factors or internal factors where the proportion of the historical data is too large, affecting the determination of the initial relationship, resulting in inaccurate initial relationship and unable to provide more accurate data for subsequent determination of the opening degree of the thermostat. A set of data is randomly selected from the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat as the observed data. For example, z(k), h(k), and K(k) at the current moment is calculated based on the covariance P(k - 1) of the estimation error at the previous moment. The specific formula is as follows:

[0064] K(k) = P(k - 1)h(k)[h T (k)P(k - 1)h(k) + u] -1

[0065] where K(k) is the latest data at the current moment, P(k - 1) is the covariance of the estimation error at the previous moment, h(k) is the observed data, and u is the value of the forgetting factor. Then, the model to be estimated is determined using K(k) The specific formula is as follows:

[0066]

[0067] where is the model to be estimated and z(k) is the observed data. The initial relationship is further calculated. The specific formula is as follows:

[0068]

[0069] Where P(k) is the initial relationship.

[0070] It should be noted that in the actual application process, when using the least squares algorithm to recursively calculate the ratio of coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat, the phenomenon of data saturation will occur. That is, as the number of recursions increases, more and more old data will accumulate, resulting in the new data information being submerged, and ultimately leading to the inability to perform parameter estimation and the failure of the algorithm. At this time, the forgetting factor can reduce the weight of historical data, weaken the influence of old data on new data, and enhance the influence of new data.

[0071] Optionally, determining the value of the forgetting factor based on the first ratio includes: determining whether the first ratio is greater than or equal to a preset threshold; in response to the first ratio being greater than or equal to the preset threshold, determining the value of the forgetting factor as the first value; in response to the first ratio being less than the preset threshold, determining the value of the forgetting factor as the second value, where the second value is greater than or equal to the first value.

[0072] The above-mentioned preset threshold can be a threshold set in advance according to specific circumstances for determining the value of the forgetting factor.

[0073] The above-mentioned first value can be the value of the forgetting factor used to reduce the weight of historical data, and can be, but is not limited to: 0, a number approaching 0 in [0, 0.05].

[0074] The above-mentioned second value can be the value of the forgetting factor used to increase the weight of historical data, and can be, but is not limited to: 1, a number approaching 1 in [0.95, 1].

[0075] In an alternative embodiment, the first ratio is compared with the preset threshold. If the first ratio is greater than or equal to the preset threshold, it indicates that historical data accounts for a relatively large proportion in the process of obtaining the target relationship. The value of the forgetting factor is determined as the first value to reduce the weight of historical data and weaken the influence of historical data on the operation. If the first ratio is less than the preset threshold, it indicates that historical data accounts for a relatively small proportion in the process of obtaining the target relationship and will not affect the accuracy of subsequent determination of the thermostat opening degree. The value of the forgetting factor is determined as the second value. For example, if the first ratio is greater than or equal to the preset threshold, the value of the forgetting factor is determined as 0; if the first ratio is less than the preset threshold, the value of the forgetting factor is determined as 1. Among them, the value of the forgetting factor determines the forgetting speed of historical data. When the value of the forgetting factor is the first value, historical data is completely forgotten. The closer the value of the forgetting factor is to 0, the faster historical data is forgotten; if the value of the forgetting factor is the second value, historical data is not forgotten. The closer the value of the forgetting factor is to 1, the more historical data is retained.

[0076] Optionally, the coolant temperature includes: the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, and the coolant temperature at the outlet of the radiator. Based on the target relationship, the target thermostat opening is determined according to the target value of the fuel cell stack temperature and the currently real-time obtained coolant temperature and the coolant pump speed, including: determining the target coolant temperature at the inlet of the fuel cell stack, where the target coolant temperature at the inlet of the fuel cell stack is the coolant temperature at the inlet of the fuel cell stack when the fuel cell stack temperature is controlled to the target value of the fuel cell stack temperature; comparing the target coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, the coolant temperature at the outlet of the radiator, and the coolant pump speed with the target relationship to determine the target thermostat opening corresponding to the target coolant temperature at the inlet of the fuel cell stack and the coolant pump speed.

[0077] In an alternative embodiment, to accurately control the fuel cell stack temperature, the target coolant temperature at the inlet of the fuel cell stack is calculated according to the coolant pump speed and the preset temperature. To make the current coolant temperature consistent with the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the inlet of the fuel cell stack, the coolant temperature, and the coolant pump speed are compared with the target relationship to determine the target thermostat opening, so as to ensure that after the thermostat opening is adjusted, accurate control of the fuel cell stack temperature can be achieved, enabling the fuel cell stack temperature to be controlled within a safe range, ensuring that the fuel cell stack can operate in a stable temperature environment, and avoiding the occurrence of safety accidents.

[0078] Optionally, based on the target relationship, the method for determining the target thermostat opening according to the target value of the fuel cell stack temperature and the currently real-time obtained coolant temperature and the coolant pump speed further includes: determining the target coolant temperature at the inlet of the fuel cell stack and the target coolant temperature at the outlet of the fuel cell stack based on the target value of the fuel cell stack temperature; using an opening algorithm to determine the target thermostat opening based on the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, the coolant temperature, and the coolant pump speed, where the opening algorithm is an algorithm for characterizing the relationship between the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, the coolant pump speed, and the target thermostat opening.

[0079] The above-mentioned opening algorithm can be an algorithm for calculating the thermostat opening.

[0080] In an alternative embodiment, since the stack temperature is related to the coolant temperatures at the inlet and outlet of the stack, the target coolant temperature at the inlet of the stack and the target coolant temperature at the outlet of the stack can be determined based on the target stack temperature value. Specifically, based on the target stack temperature value, the target coolant temperature at the inlet of the stack and the target coolant temperature at the outlet of the stack are determined, so as to ensure that the stack temperature is the preset temperature. Furthermore, using the opening algorithm, calculations are performed based on the target coolant temperature at the inlet of the stack, the target coolant temperature at the outlet of the stack, the coolant temperature, and the coolant pump speed. When the coolant pump speed is determined, in order to accurately control the coolant temperatures at the inlet and outlet of the stack, the required thermostat opening is determined, so as to ensure that the coolant temperatures at the inlet and outlet of the stack are the target coolant temperature at the inlet of the stack and the target coolant temperature at the outlet of the stack. This realizes accurate control of the stack temperature, reduces the repeated oscillating fluctuations of the coolant temperatures at the inlet and outlet of the stack caused by inaccurate target thermostat opening, and solves the problem of unstable stack temperature, thereby improving the accuracy and robustness of controlling the stack temperature.

[0081] Optionally, controlling the thermostat based on the target thermostat opening includes: obtaining a control signal corresponding to the target thermostat opening; controlling the thermostat opening according to the control signal.

[0082] The above control signal can be a signal for controlling the thermostat opening.

[0083] In an alternative embodiment, a control signal is generated according to the target thermostat opening and sent to the thermostat. The thermostat automatically adjusts the opening according to the control signal, accelerating or slowing down the flow rate of the coolant passing through the stack, thereby adjusting the stack temperature to the preset temperature, so as to realize accurate control of the stack temperature, avoid fluctuations in the stack temperature, affect the working performance of the stack, and thus improve the working efficiency of the stack and ensure that the stack operates within a safe temperature range.

[0084] Figure 4 is a flowchart of an alternative stack temperature control method according to an embodiment of the present invention, as Figure 4 shown, the steps of the method are as follows:

[0085] Step S401, obtaining the coolant temperature of the coolant, the coolant pump speed of the coolant pump, and the thermostat opening of the thermostat;

[0086] Step S402, determining the ratio of the coolant flow rate according to the coolant temperature;

[0087] Step S403, determining a target relationship according to the ratio of the coolant flow rate, the coolant pump speed, and the thermostat opening;

[0088] Step S404, obtaining the target coolant temperature at the inlet of the stack;

[0089] Step S405: Compare the coolant temperature at the inlet of the target stack, the rotational speed of the coolant pump with the target relationship to determine the opening degree of the target thermostat.

[0090] Step S406: Control the opening degree of the thermostat according to the opening degree of the target thermostat.

[0091] Embodiment 2

[0092] According to an embodiment of the present invention, there is also provided a control device for the stack temperature. This device can execute the stack temperature control method in the above embodiment. The specific implementation manner and preferred application scenario are the same as those in the above embodiment and will not be elaborated here.

[0093] Figure 5 is a schematic diagram of a control device for the stack temperature according to an embodiment of the present invention, as Figure 5 shown. The device includes the following parts: an acquisition module 50, a first determination module 52, a second determination module 54, and a control module 56.

[0094] Among them, the acquisition module 50 is used to acquire the coolant temperature of the coolant, the rotational speed of the coolant pump of the coolant pump, and the opening degree of the thermostat of the thermostat. Among them, the coolant temperature of the coolant includes the coolant temperature in the first heat pipeline loop and the coolant temperature in the second heat pipeline loop;

[0095] The first determination module 52 is used to determine the target relationship based on the coolant temperature, the rotational speed of the coolant pump, and the opening degree of the thermostat by using an online identification algorithm. Among them, the target relationship is the correlation relationship between the opening degree of the thermostat and the coolant temperature and the rotational speed of the coolant pump;

[0096] The second determination module 54 determines the target opening degree of the thermostat based on the target relationship, according to the stack temperature target value and the currently real-time acquired coolant temperature and the rotational speed of the coolant pump;

[0097] The control module 56 is used to control the thermostat based on the target opening degree of the thermostat to control the ratio of the coolant flow rate, and further control the coolant temperature at the inlet of the stack so that the stack temperature is maintained at the stack temperature target value.

[0098] Optionally, the first determination module includes: a first determination unit for determining the ratio of the coolant flow rate based on the coolant temperature at the inlet of the stack, the coolant temperature at the outlet of the stack, and the coolant temperature at the outlet of the radiator; a recursion unit for using the least squares algorithm with a forgetting factor to recursively calculate the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat to obtain an initial relationship; an iteration unit for using an online identification algorithm to update and iterate the initial relationship to determine the target relationship.

[0099] Optionally, the first determination unit includes: a first acquisition subunit, configured to acquire the difference between the coolant temperature at the inlet of the fuel cell stack and the coolant temperature at the outlet of the radiator to obtain a first difference; a second acquisition subunit, configured to acquire the difference between the coolant temperature at the outlet of the fuel cell stack and the coolant temperature at the outlet of the radiator to obtain a second difference; a third acquisition subunit, configured to acquire the ratio of the first difference to the second difference to obtain the ratio of the coolant flow rates.

[0100] Optionally, the recursion unit includes: a fourth acquisition subunit, configured to determine the number of historical data and the number of new data, where the number of historical data is the number of ratios of coolant flow rates, cooling water pump speeds, and thermostat opening degrees acquired within a historical time period, and the number of new data is the number of ratios of coolant flow rates, cooling water pump speeds, and thermostat opening degrees acquired within the current time period; a fifth acquisition subunit, configured to acquire the ratio of the number of historical data to the number of new data to obtain a first ratio; a first determination subunit, configured to determine the forgetting factor value based on the first ratio; a second determination subunit, configured to perform recursion on the ratio of the coolant flow rate, the cooling water pump speed, and the thermostat opening degree by using the least squares method based on the forgetting factor value to determine an initial relationship.

[0101] Optionally, the first determination subunit is further configured to determine whether the first ratio is greater than or equal to a preset threshold; in response to the first ratio being greater than or equal to the preset threshold, determine the forgetting factor value as a first value; in response to the first ratio being less than the preset threshold, determine the forgetting factor value as a second value, where the second value is greater than or equal to the first value.

[0102] Optionally, the second determination module includes: a second determination unit, configured to determine the target coolant temperature at the inlet of the fuel cell stack, where the target coolant temperature at the inlet of the fuel cell stack is the coolant temperature at the inlet of the fuel cell stack when the fuel cell temperature is controlled to the fuel cell temperature target value; a third determination unit, configured to compare the target coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the inlet of the fuel cell stack, the coolant temperature at the outlet of the fuel cell stack, the coolant temperature at the outlet of the radiator, the cooling water pump speed with a target relationship to determine the target thermostat opening degree corresponding to the target coolant temperature at the inlet of the fuel cell stack and the cooling water pump speed.

[0103] Optionally, the second determination module further includes: a fourth determination unit, configured to determine the target coolant temperature at the inlet of the fuel cell stack and the target coolant temperature at the outlet of the fuel cell stack based on the fuel cell temperature target value; a fifth determination unit, configured to determine the target thermostat opening degree by using an opening degree algorithm based on the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, the coolant temperature, and the cooling water pump speed, where the opening degree algorithm is an algorithm for characterizing the relationship between the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, and the cooling water pump speed and the target thermostat opening degree.

[0104] Optionally, the control module includes: an acquisition unit configured to acquire a control signal corresponding to a target thermostat opening; and a control unit configured to control the thermostat opening according to the control signal.

[0105] Embodiment 3

[0106] On the other hand, according to an embodiment of the present invention, there is also provided a computer-readable storage medium. The computer-readable storage medium includes a stored program, wherein when the program runs, it controls a processor of a device where it is located to execute the method for controlling the stack temperature in any one of the above embodiments.

[0107] Embodiment 4

[0108] On the other hand, according to an embodiment of the present invention, there is also provided a vehicle, including: one or more processors; a storage device configured to store one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors execute the method for controlling the stack temperature in any one of the above embodiments.

[0109] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages and disadvantages of the embodiments.

[0110] In the above embodiments of the present invention, the descriptions of the various embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0111] In the several embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only illustrative. For example, the division of the units can be a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the couplings or direct couplings or communication connections shown or discussed with each other can be through some interfaces. The indirect couplings or communication connections of the units or modules can be in an electrical or other form.

[0112] The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0113] In addition, in each embodiment of the present invention, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0114] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical discs.

[0115] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for controlling the temperature of an electric stack, characterized in that, The inlet of the stack is connected to the output end of the coolant pump, the outlet of the stack is connected to the inlet of the thermostat, the first outlet of the thermostat is connected to the input end of the coolant pump, the second outlet of the thermostat is connected to the input port of the radiator, the output port of the radiator is connected to the input end of the coolant pump, and the coolant can flow through the coolant pump, the stack, the thermostat in sequence and then flow back into the coolant pump to form a first heat pipe circuit. The coolant can flow through the coolant pump, the stack, the thermostat, the radiator in sequence and then flow back into the coolant pump to form a second heat pipe circuit. The thermostat is used to control the ratio of the coolant flow rate flowing into the inlet of the thermostat to the coolant flow rate flowing out of the second outlet of the thermostat. The method includes: Obtain the coolant temperature of the coolant, the coolant pump speed of the coolant pump, and the thermostat opening of the thermostat, where the coolant temperature of the coolant includes the coolant temperature in the first heat pipe circuit and the coolant temperature in the second heat pipe circuit; Use an online identification algorithm to determine a target relationship based on the coolant temperature, the coolant pump speed, and the thermostat opening, where the target relationship is the correlation relationship between the thermostat opening and the coolant temperature and the coolant pump speed; Based on the target relationship, determine the target thermostat opening of the thermostat according to the stack temperature target value and the currently real-time obtained coolant temperature and coolant pump speed; Control the thermostat based on the target thermostat opening to control the ratio of the coolant flow rate, and further control the coolant temperature at the stack inlet so that the stack temperature is maintained at the stack temperature target value.

2. The control method of the stack temperature according to claim 1, characterized in that, The coolant temperature includes: the coolant temperature at the stack inlet, the coolant temperature at the stack outlet, and the coolant temperature at the radiator outlet. The inlet of the stack is also connected to a coolant temperature sensor at the stack inlet, the outlet of the stack is also connected to a coolant temperature sensor at the stack outlet, and the output port of the radiator is also connected to a coolant temperature sensor at the radiator outlet. The coolant temperature sensor at the stack inlet is used to obtain the coolant temperature at the stack inlet, the coolant temperature sensor at the stack outlet is used to obtain the coolant temperature at the stack outlet, and the coolant temperature sensor at the radiator outlet is used to obtain the coolant temperature at the radiator outlet. Using an online identification algorithm to determine a target relationship based on the coolant temperature, the coolant pump speed, and the thermostat opening includes: Based on the coolant temperature at the stack inlet, the coolant temperature at the stack outlet, and the coolant temperature at the radiator outlet, determine the ratio of the coolant flow rate; Use the least squares algorithm with a forgetting factor to recursively calculate the ratio of the coolant flow rate, the coolant pump speed, and the thermostat opening to obtain an initial relationship; Use the online identification algorithm to update and iterate the initial relationship to determine the target relationship.

3. The control method of the stack temperature according to claim 2, characterized in that, Determining the ratio of the coolant flow rate based on the coolant temperature at the inlet of the stack, the coolant temperature at the outlet of the stack, and the coolant temperature at the outlet of the radiator includes: Obtaining the difference between the coolant temperature at the inlet of the stack and the coolant temperature at the outlet of the radiator to obtain a first difference; Obtaining the difference between the coolant temperature at the outlet of the stack and the coolant temperature at the outlet of the radiator to obtain a second difference; Obtaining the ratio of the first difference to the second difference to obtain the ratio of the coolant flow rate.

4. The control method of the stack temperature according to claim 2, characterized in that Using the least squares algorithm with a forgetting factor to recursively calculate the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat to determine the initial relationship, including: Determining the number of historical data and the number of new data, where the number of historical data is the number of the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat obtained within a historical time period, and the number of new data is the number of the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat obtained within the current time period; Obtaining the ratio of the number of historical data to the number of new data to obtain a first ratio; Determining the value of the forgetting factor based on the first ratio; Based on the value of the forgetting factor, using the least squares method to recursively calculate the ratio of the coolant flow rate, the rotational speed of the coolant pump, and the opening degree of the thermostat to determine the initial relationship.

5. The control method of the stack temperature according to claim 4, wherein Determining the value of the forgetting factor based on the first ratio includes: Judging whether the first ratio is greater than or equal to a preset threshold; In response to the first ratio being greater than or equal to the preset threshold, determining the value of the forgetting factor as a first value; In response to the first ratio being less than the preset threshold, determining the value of the forgetting factor as a second value, where the second value is greater than or equal to the first value.

6. The control method of the stack temperature according to claim 1, wherein The coolant temperature includes the coolant temperature at the inlet of the stack, the coolant temperature at the outlet of the stack, and the coolant temperature at the outlet of the radiator. Based on the target relationship, determining the target opening degree of the thermostat according to the target value of the stack temperature and the currently real-time obtained coolant temperature and the rotational speed of the coolant pump includes: Determining the target coolant temperature at the inlet of the stack, where the target coolant temperature at the inlet of the stack is the coolant temperature at the inlet of the stack for controlling the stack temperature to the target value of the stack temperature; Comparing the target coolant temperature at the inlet of the stack, the coolant temperature at the inlet of the stack, the coolant temperature at the outlet of the stack, the coolant temperature at the outlet of the radiator, the rotational speed of the coolant pump with the target relationship to determine the target opening degree of the thermostat corresponding to the target coolant temperature at the inlet of the stack and the rotational speed of the coolant pump.

7. The control method of the stack temperature according to claim 1, wherein Based on the target relationship, determining the target opening degree of the thermostat according to the target value of the stack temperature and the currently real-time obtained coolant temperature and the rotational speed of the coolant pump includes: Based on the target value of the stack temperature, determining the target coolant temperature at the inlet of the stack and the target coolant temperature at the outlet of the stack; Using an opening algorithm, determine the target thermostat opening based on the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, the coolant temperature, and the cooling water pump speed, where the opening algorithm is an algorithm for characterizing the relationship between the target coolant temperature at the inlet of the fuel cell stack, the target coolant temperature at the outlet of the fuel cell stack, the cooling water pump speed, and the target thermostat opening.

8. The method for controlling the temperature of the stack according to claim 1, wherein Controlling the thermostat based on the target thermostat opening includes: Obtaining a control signal corresponding to the target thermostat opening; Controlling the thermostat opening according to the control signal.

9. A control device for the temperature of an electric stack, characterized in that, The inlet of the fuel cell stack is connected to the output end of the cooling water pump, the outlet of the fuel cell stack is connected to the inlet of the thermostat, the first outlet of the thermostat is connected to the input end of the cooling water pump, the second outlet of the thermostat is connected to the input port of the radiator, and the output port of the radiator is connected to the input end of the cooling water pump. The coolant can flow through the cooling water pump, the fuel cell stack, the thermostat, and then flow back into the cooling water pump to form a first heat pipe circuit. The coolant can flow through the cooling water pump, the fuel cell stack, the thermostat, the radiator, and then flow back into the cooling water pump to form a second heat pipe circuit. The thermostat is used to control the ratio of the coolant flow rate flowing into the inlet of the thermostat to the coolant flow rate flowing out of the second outlet of the thermostat. The device includes: An acquisition module for acquiring the coolant temperature of the coolant, the cooling water pump speed of the cooling water pump, and the thermostat opening of the thermostat, where the coolant temperature of the coolant includes the coolant temperature in the first heat pipe circuit and the coolant temperature in the second heat pipe circuit; A first determination module for using an online identification algorithm to determine a target relationship based on the coolant temperature, the cooling water pump speed, and the thermostat opening, where the target relationship is the correlation relationship between the thermostat opening and the coolant temperature and the cooling water pump speed; A second determination module for determining the target thermostat opening of the thermostat based on the target relationship, the fuel cell stack temperature target value, and the currently real-time acquired coolant temperature and cooling water pump speed; A control module for controlling the thermostat based on the target thermostat opening to control the ratio of the coolant flow rate, and further controlling the coolant temperature at the inlet of the fuel cell stack so that the fuel cell stack temperature is maintained at the fuel cell stack temperature target value.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, where when the program runs, it controls the processor of the device to execute the control method of the fuel cell stack temperature according to any one of claims 1 to 8.

Images