Fuel cell thermal management system control method and device and vehicle

Abstract

The invention discloses a fuel cell thermal management system control method and device and a vehicle, and the method comprises the steps: obtaining the entering stack water temperature of cooling water in a fuel cell thermal management system after an electric stack of a fuel cell starts to work; if the reactor inlet water temperature is larger than the preset upper limit threshold value, the temperature control valve is controlled to be opened to the first opening degree; when the reactor inlet water temperature is reduced to the upper limit threshold value, the temperature control valve is controlled to be opened to a second opening degree so as to reduce heat dissipation of cooling water; and in the process of reducing heat dissipation of the cooling water, if the in-reactor water temperature and a preset lower limit threshold meet a target condition, the first opening degree and the second opening degree are adjusted and updated, the updated first opening degree and the updated second opening degree are obtained, and the temperature control valve is controlled based on the updated first opening degree and the updated second opening degree. In this way, the temperature control valve is rapidly adjusted to the optimal opening degree through later-stage water temperature changes, the temperature control valve does not change too frequently, and part losses are reduced.

Description

Technical Field

[0001] The present invention relates to the field of fuel cell technology, and in particular to a fuel cell thermal management system control method, device and vehicle. Background Art

[0002] The fuel cell thermal management system is an important system mainly used to maintain the operating temperature of the fuel cell. It controls the flow of circulating cooling water flowing through the pipelines of the heat source components and the heat dissipation components through temperature control valves to keep the temperature of the fuel cell stack within an appropriate range.

[0003] However, there is a lag in the temperature control valve's control over the temperature of the water entering the stack. Simply controlling the temperature control valve directly based on the target value of the water temperature entering the stack can easily lead to large fluctuations in the water temperature, which is not conducive to the operation of the fuel cell stack.

[0004] Moreover, excessive adjustment of the temperature control valve may cause the temperature to rise or fall too quickly, and the water temperature entering the reactor may frequently fluctuate above and below the target temperature, shortening the opening cycle of the temperature control valve and increasing the loss of the temperature control valve. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide a fuel cell thermal management system control method, device and vehicle, which can avoid the opening cycle of the temperature control valve while controlling the inlet water temperature to ensure the durability of the temperature control valve components.

[0006] According to a first aspect of the present invention, a fuel cell thermal management system control method is provided, comprising:

[0007] After the fuel cell stack starts to work, the inlet water temperature of the cooling water in the fuel cell thermal management system is obtained;

[0008] If the water temperature entering the stack is greater than a preset upper threshold, the temperature control valve is controlled to open to a first opening to increase heat dissipation to the cooling water;

[0009] When the inlet water temperature drops to the upper limit threshold, the temperature control valve is controlled to open to a second opening degree to reduce the heat dissipation of cooling water, and the second opening degree is smaller than the first opening degree;

[0010] In the process of reducing the heat dissipation of cooling water, if the water temperature entering the stack and a preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening, and the temperature control valve is controlled based on the updated first opening and the updated second opening.

[0011] Optionally, if the water temperature entering the stack and a preset lower limit threshold satisfy a target condition, adjusting and updating the first opening and the second opening to obtain an updated first opening and an updated second opening includes:

[0012] Within a preset first time period, if the water temperature entering the stack and the lower limit threshold satisfy a first target condition, obtaining the water temperature at the radiator outlet;

[0013] According to the upper threshold, the lower threshold and the radiator outlet water temperature, the first opening is adjusted and updated to obtain the updated first opening;

[0014] Within a preset second time period, if the water temperature entering the stack and the upper limit threshold meet a second target condition, the second opening is adjusted and updated to obtain the updated second opening; wherein the second time period occurs after the first time period.

[0015] Optionally, within a preset first time period, if the inlet water temperature and a preset lower threshold value meet a first target condition, the radiator outlet water temperature is obtained, and the first opening is adjusted and updated according to the upper threshold value, the lower threshold value and the radiator outlet water temperature to obtain the updated first opening degree, including:

[0016] Determining the lowest temperature of the water entering the reactor within the first time period;

[0017] If the temperature difference between the minimum temperature and the lower limit threshold exceeds a preset target range, the first target condition is met, and the radiator outlet water temperature is obtained;

[0018] The first opening is adjusted and updated according to the upper threshold, the lower threshold, the minimum temperature and the radiator outlet water temperature to obtain the updated first opening.

[0019] Optionally, adjusting and updating the first opening according to the upper threshold, the lower threshold, the minimum temperature and the radiator outlet water temperature to obtain the updated first opening includes:

[0020] Determining a first difference value according to the upper threshold value and the radiator outlet water temperature;

[0021] Determining a second difference value according to the lower limit threshold and the radiator outlet water temperature;

[0022] Determining a third difference value according to the minimum temperature and the radiator outlet water temperature;

[0023] The updated first opening degree is determined according to the first difference, the second difference and the third difference.

[0024] Optionally, the method further includes:

[0025] If the minimum temperature is lower than a preset low temperature threshold, the temperature control valve is controlled to close to reduce the heat dissipation of the cooling water;

[0026] After the inlet water temperature is greater than the lower limit threshold, the temperature control valve is controlled to open to the second opening degree.

[0027] Optionally, within the preset second time period, if the water temperature entering the stack and the upper limit threshold satisfy a second target condition, adjusting and updating the second opening to obtain the updated second opening includes:

[0028] detecting whether the water temperature entering the stack decreases within the second time period;

[0029] If it is detected that the inlet water temperature decreases within the second time period, the second opening is used as the target opening, and an opening reduction updating step is performed on the target opening, wherein the opening reduction updating step includes:

[0030] Controlling the target opening to decrease, obtaining a decreased opening, controlling the temperature control valve to open to the decreased opening, and if a decrease in the inlet water temperature is detected within the next second time period, taking the decreased opening as the target opening, and executing the opening decrease update step again;

[0031] If it is detected within the next second time period that the water temperature entering the stack has not decreased, the updated second opening degree is determined based on the reduced opening degree.

[0032] Optionally, if it is detected that the water temperature entering the stack has not decreased within the next second time period, determining the updated second opening degree according to the reduced opening degree includes:

[0033] If it is detected that the water temperature entering the stack has not decreased within the next second time period, then when the water temperature entering the stack rises back to the upper limit threshold, a target change rate of the water temperature entering the stack is calculated;

[0034] If the target change rate is greater than a preset rate threshold, the reduced opening is increased and updated to obtain the updated second opening.

[0035] Optionally, after the step of obtaining the inlet water temperature of cooling water in the fuel cell thermal management system after the fuel cell stack starts to work, the method further includes:

[0036] Obtain the battery stack power, accessory power consumption and radiator outlet water temperature;

[0037] Based on the radiator outlet water temperature and the stack inlet water temperature, a first opening is determined by searching in a preset first relationship table; wherein the first relationship table includes a temperature difference and a target first opening corresponding to the temperature difference, and the temperature difference is the difference between the stack inlet water temperature and the radiator outlet water temperature;

[0038] Based on the battery stack power, the accessory loss and power consumption, the radiator outlet water temperature and the stack inlet water temperature, a second opening is determined by searching in a preset second relationship table; wherein, the second relationship table includes the power difference and the temperature difference, and the second relationship table also includes a target second opening corresponding to the power difference and the temperature difference, and the power difference is the difference between the battery stack power and the accessory loss and power consumption.

[0039] Optionally, controlling the temperature control valve based on the updated first opening and the updated second opening includes:

[0040] If the inlet water temperature rises back to the upper limit threshold, the temperature control valve is controlled to open to the updated first opening to increase the heat dissipation of the cooling water;

[0041] When the water temperature entering the stack drops to the upper limit threshold, the temperature control valve is controlled to open to the second opening to reduce the heat dissipation of the cooling water;

[0042] In the process of reducing the heat dissipation of cooling water, if the water temperature entering the stack and a preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening.

[0043] Optionally, before the step of controlling the temperature control valve to open to a first opening to increase heat dissipation of cooling water if the water temperature entering the stack is greater than a preset upper limit threshold, the method further includes:

[0044] Get the radiator outlet water temperature;

[0045] If the radiator outlet water temperature is greater than or equal to a preset lower threshold, the temperature control valve is controlled to be fully opened;

[0046] If the radiator outlet water temperature is less than the lower threshold, the stack inlet water temperature is compared with the upper threshold.

[0047] Optionally, before controlling the temperature control valve to open to the first opening degree, the method further includes:

[0048] Acquire an initial opening, and control the temperature control valve to open to the initial opening;

[0049] If the water temperature entering the stack decreases within the preset third time period, the initial opening degree is used as the first opening degree;

[0050] If the inlet water temperature rises within the third time period, the initial opening is used as a revised opening, and an increasing and updating step is performed on the revised opening, wherein the increasing and updating step includes:

[0051] The corrected opening is controlled to increase to obtain an increased opening, and the temperature control valve is controlled to open to the increased opening. If a rise in the water temperature entering the stack is detected within the next third time period, the increased opening is used as the corrected opening, and the increase and update step is performed again; if no rise in the water temperature entering the stack is detected within the next third time period, the increased opening is used as the first opening.

[0052] Optionally, after the step of obtaining the inlet water temperature of cooling water in the fuel cell thermal management system, the method further comprises:

[0053] If the inlet water temperature is less than or equal to the upper limit threshold, the temperature control valve is controlled to close.

[0054] According to a second aspect of the present invention, there is provided a fuel cell thermal management system control device, comprising:

[0055] An acquisition module, used to acquire the inlet water temperature of cooling water in the fuel cell thermal management system after the fuel cell stack starts to work;

[0056] A first opening module is used to control the temperature control valve to open to a first opening degree to increase the heat dissipation of cooling water when the water temperature entering the stack is greater than a preset upper limit threshold;

[0057] a second opening module, configured to control the temperature control valve to open to a second opening degree when the water temperature entering the stack drops to the upper limit threshold, so as to reduce the heat dissipation of cooling water, wherein the second opening degree is smaller than the first opening degree;

[0058] A control module is used to adjust and update the first opening and the second opening to obtain an updated first opening and an updated second opening if the water temperature entering the stack and a preset lower limit threshold meet the target conditions during the process of reducing the heat dissipation of the cooling water, and control the temperature control valve based on the updated first opening and the updated second opening.

[0059] According to a third aspect of the present invention, a controller is provided, the controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the aforementioned fuel cell thermal management system control method.

[0060] According to a fourth aspect of the present invention, a vehicle is provided, the vehicle comprising a vehicle body and a controller installed in the vehicle body, wherein the controller executes the aforementioned fuel cell thermal management system control method.

[0061] The above one or more technical solutions in the embodiments of this specification have at least the following technical effects:

[0062] The embodiments of the present specification provide a fuel cell thermal management system control method, device and vehicle, which obtain the water temperature of the cooling water entering the stack in the fuel cell thermal management system after the fuel cell stack starts working; if the water temperature entering the stack is greater than the preset upper limit threshold, the temperature control valve is controlled to open to the first opening to increase the heat dissipation of the cooling water; when the water temperature entering the stack drops to the upper limit threshold, the temperature control valve is controlled to open to the second opening to reduce the heat dissipation of the cooling water, and the second opening is less than the first opening; in the process of reducing the heat dissipation of the cooling water, if the water temperature entering the stack and the preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain the updated first opening and the updated second opening, and the temperature control valve is controlled based on the updated first opening and the updated second opening. In this way, the control of the water temperature entering the stack is achieved by controlling the opening of the temperature control valve, and it is insensitive to the selection of the initial value of the temperature control valve. Through the later water temperature changes, the temperature control valve can be quickly adjusted to the most suitable opening, thereby controlling the water temperature change speed. The temperature control valve will not change too frequently, reducing the wear and tear of components.

[0063] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Also, throughout the accompanying drawings, the same reference figures are used to represent the same components. In the drawings:

[0065] Figure 1 A flow chart of a fuel cell thermal management system control method in an embodiment of the present invention is shown.

[0066] Figure 2 A schematic diagram of a thermal management system in an embodiment of the present invention is shown.

[0067] Figure 3A block diagram of a fuel cell thermal management system control device in an embodiment of the present invention is shown. Legend:

[0068] Radiator-1, temperature control valve-2, heater-3, water kettle-4, water pump-5, battery stack-6, particulate filter-7. DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0070] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0072] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0073] The embodiment of the present invention provides a fuel cell thermal management system control method, combined with Figure 1 The method includes steps 101 to 104:

[0074] Step 101: After the fuel cell stack starts to work, the inlet water temperature of the cooling water in the fuel cell thermal management system is obtained;

[0075] In this embodiment, a fuel cell is a power generation device that directly converts the chemical energy of a fuel and an oxidant into electrical energy through an electrochemical reaction. The fuel cell of this embodiment may be a hydrogen-oxygen fuel cell. The stack is a core component in a fuel cell and is used to generate electrical energy. The stack generates excess heat when it is working, and this excess heat causes the temperature inside the stack to rise. The stack has a temperature range suitable for operation, and if it exceeds this temperature range, it will affect the performance of the stack. Therefore, a thermal management system is required to take away the excess heat in the stack.

[0076] Combination Figure 2 As shown, the thermal management system includes a radiator 1, a temperature control valve 2, a heater 3, a water kettle 4, a water pump 5, a battery stack 6 and a particle filter 7. In this embodiment, after the cooling water flows out of the battery stack 6, it dissipates heat through an external pipeline and then flows into the battery stack 6. Among them, the external management of the thermal management system includes two circulation paths, namely a large circulation path and a small circulation path. The large circulation path refers to the cooling water flowing out of the battery stack 6, passing through the radiator 1, the temperature control valve 2, the water pump 5, the particle filter 7 in sequence, and then entering the battery stack 6. The small circulation path refers to the cooling water flowing out of the battery stack 6, passing through the heater 3, the temperature control valve 2, the water pump 5, the particle filter 7 in sequence, and then entering the battery stack 6. By changing the opening of the temperature control valve 2, the flow rate of the cooling water in the large circulation and the small circulation can be adjusted.

[0077] For example, the opening range of the temperature control valve 2 is 0-90. When the opening of the temperature control valve 2 is 90, it can be understood that the temperature control valve 2 is fully closed, the cooling water flows through the large circulation path, and the cooling water flow in the small circulation path is basically 0. At this time, the heat dissipation effect of the cooling water is the largest. When the temperature control valve 2 is 0, it means that the temperature control valve 2 is fully open, the cooling water flows through the small circulation path, and the cooling water flow in the large circulation path is basically 0. At this time, the heat dissipation effect of the cooling water is the smallest. In this embodiment, the maximum opening of the temperature control valve 2 is 90 instead of 100. First, because the general temperature control valve 2 is not designed to rotate the mechanical angle to the bottom to completely block a water channel, and a part of the rotation angle is reserved to avoid component loss. Second, when the angle reaches a certain size, even if it changes again, its impact on the cooling water temperature is very limited.

[0078] It should be noted that the impact of the radiator's large cycle on the water temperature entering the reactor is not determined by the flow ratio of the large and small cycles. In fact, when the opening is larger, to increase the same water temperature rise rate, the rate of change of the opening should also become larger. For example, in the case of an opening of 80 and an opening of 85, based on actual measured experience, the difference between the two is almost negligible. This is mainly because when the temperature control valve becomes larger and larger, the cooling water of the large cycle will mix into other pipelines earlier, and is also subject to multiple factors such as pipeline flow, flow resistance and ambient temperature. Therefore, in this embodiment, it has been iterating proportionally based on the basic value of the opening, which is more in line with reality.

[0079] After the fuel cell stack starts working, the water temperature of the cooling water entering the stack in the fuel cell thermal management system is obtained. The water temperature entering the stack refers to the temperature of the cooling water at the inlet of the stack. The water temperature entering the stack can be collected by a sensor.

[0080] In addition, after the fuel cell stack starts working, the radiator outlet water temperature is also obtained. Generally, the radiator outlet water temperature will not be extremely high or too low, otherwise it will enter the fault emergency stop or low temperature cold start strategy.

[0081] The radiator outlet water temperature is controlled by the radiator, and the radiator outlet temperature is determined in real time throughout the entire process of this embodiment. If the radiator outlet water temperature is greater than or equal to the preset lower threshold, the temperature control valve is controlled to be fully opened, that is, opened to 90 degrees, until the radiator outlet water temperature is less than the lower threshold, and then the inlet water temperature is compared with the upper threshold. The purpose is to show that the fuel cell stack is starting up normally and is not in a state of too low or too high temperature. Because if the radiator outlet water temperature is greater than the lower threshold, the temperature control valve can be fully opened to dissipate heat to the maximum extent, and it is meaningless to fine-tune the temperature control valve later.

[0082] The upper threshold refers to the upper limit temperature at which the fuel cell is suitable for operation, and the lower threshold refers to the lower limit temperature at which the fuel cell is suitable for operation.

[0083] After the battery stack starts working, the first opening used for the first time is an initial opening. The same is true for the second opening used for the first time, except that the corresponding values ​​of the two initial openings may be different. They can all be obtained by looking up the table, and the steps include:

[0084] Obtain the battery stack power, accessory power consumption and radiator outlet water temperature;

[0085] Based on the radiator outlet water temperature and the stack inlet water temperature, searching in a preset first relationship table to determine a first opening degree;

[0086] Based on the battery stack power, the accessory loss power consumption, the radiator outlet water temperature and the stack inlet water temperature, a second opening is determined by searching in a preset second relationship table.

[0087] Among them, the stack power refers to the power output by the stack, and the fuel cell accessory loss power refers to the power consumed by other accessories.

[0088] The first relationship table includes the temperature difference and the target first opening corresponding to the temperature difference. The temperature difference is the difference between the water temperature entering the reactor and the water temperature at the radiator outlet. According to the actual situation, when the first opening is needed for the first time, the water temperature entering the reactor and the water temperature at the radiator outlet can be obtained, and then the temperature difference between the two can be calculated. Then, according to the temperature difference, the first relationship table is searched and the corresponding target first opening is matched, and the target first opening is used as the first opening for the first use.

[0089] The second relationship table includes power difference and temperature difference, and the second relationship table also includes a target second opening corresponding to the power difference and temperature difference. The power difference is the difference between the stack power and the accessory loss power consumption. According to the actual situation, when the second opening needs to be used for the first time, the stack power, accessory loss power consumption, water temperature entering the stack and the radiator outlet water temperature can be obtained, and then the temperature difference between the water temperature entering the stack and the water temperature at the radiator outlet can be calculated. Calculate the power difference between the stack power and the accessory loss power consumption. According to the power difference and temperature difference, search in the second relationship table, match and obtain the corresponding target second opening, and the target second opening is used as the second opening for the first time.

[0090] It should be noted that the relevant data in the first relationship table and the second relationship table can be measured through calibration experiments. In addition, the first opening can also be directly set to a preset value, for example, the first opening used for the first time is preset to 70. Because usually, the first opening has little effect and can be corrected later.

[0091] Step 102: If the water temperature entering the stack is greater than a preset upper threshold, the temperature control valve is controlled to open to a first opening to increase heat dissipation of the cooling water;

[0092] In this embodiment, the water temperature entering the stack is compared with the upper limit threshold. There are two comparison results: one is that the water temperature entering the stack is greater than the upper limit threshold, and the other is that the water temperature entering the stack is less than or equal to the upper limit threshold.

[0093] If the water temperature entering the stack is less than or equal to the upper threshold, the temperature control valve needs to be controlled to close so that the cooling water flow in the small loop path is maximized, thereby reducing the heat dissipation of the cooling water and allowing the cooling water to heat up quickly.

[0094] If the temperature of water entering the stack is greater than the upper threshold, the temperature control valve is controlled to open to the first opening to increase the heat dissipation of the cooling water and reduce the temperature of the cooling water.

[0095] In one embodiment, before controlling the temperature control valve to open to the first opening degree, the method further includes:

[0096] Obtain the initial opening, and control the temperature control valve to open to the initial opening;

[0097] If the water temperature entering the reactor drops within the preset third time period, the initial opening degree is used as the first opening degree;

[0098] If the temperature of the water entering the reactor rises within the third time period, the initial opening is used as the revised opening, and the revised opening is increased and updated, wherein the increasing and updating step includes:

[0099] The control correction opening is increased to obtain the increased opening, and the temperature control valve is controlled to open to the increased opening. If the inlet water temperature is detected to rise within the next third time period, the increased opening is used as the correction opening, and the increase update step is performed again; if the inlet water temperature is detected not to rise within the next third time period, the increased opening is used as the first opening.

[0100] The initial opening here refers to the opening value obtained by looking up the table when the first opening is used for the first time. The specific table lookup steps can be referred to above and will not be repeated here.

[0101] The third time length is a preset time length. The value of the third time length can be determined according to the length of the thermal management system pipeline. The longer the pipeline, the greater the third time length, and the shorter the pipeline, the shorter the third time length. Because the adjustment of the temperature control valve has a lag effect on the cooling water temperature. It is not difficult to understand that the longer the pipeline, the greater the lag in time.

[0102] In this embodiment, after the temperature control valve is opened to the initial opening, it is hoped that the temperature of the water entering the reactor can be reduced. Since it is unknown whether the initial opening is sufficient to reduce the temperature of the water entering the reactor, it is necessary to observe the change of the temperature of the water entering the reactor within the third time period. If the temperature of the water entering the reactor decreases within the third time period, it means that the initial opening is large enough, and the initial opening can be used as the first opening.

[0103] If the temperature of the water entering the stack increases within the third time period, it means that the initial opening is not large enough, and the heat dissipated by the cooling water may be less than the heat generated by the stack. At this time, the initial opening needs to be increased and updated for at least one round until the temperature of the water entering the stack drops within the third time period when it is tested again.

[0104] Step 103: When the temperature of water entering the stack drops to an upper threshold, the temperature control valve is controlled to open to a second opening to reduce heat dissipation of the cooling water.

[0105] In this embodiment, after the temperature control valve is opened to the first opening, the water temperature entering the stack begins to drop. However, the water temperature entering the stack cannot drop all the time. In this embodiment, it is hoped that the water temperature entering the stack is maintained between the upper threshold and the lower threshold. Therefore, when the water temperature entering the stack drops to the upper threshold, the temperature control valve is controlled to open to the second opening. The second opening is smaller than the first opening, and the purpose is to reduce the heat dissipation of the cooling water and make the water temperature entering the stack rise again.

[0106] Step 104: In the process of reducing the heat dissipation of cooling water, if the water temperature entering the stack and the preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening, and the temperature control valve is controlled based on the updated first opening and the updated second opening.

[0107] In this embodiment, as the temperature of the water entering the stack changes, the first opening and the second opening are adjusted in real time to make the temperature of the water entering the stack between the upper threshold and the lower threshold. The target condition includes the first target condition and the second target condition, and the specific judgment steps are:

[0108] Within a preset first time period, if the water temperature entering the stack and the lower limit threshold meet the first target condition, the radiator outlet water temperature is obtained;

[0109] According to the upper threshold, the lower threshold and the radiator outlet water temperature, the first opening is adjusted and updated to obtain an updated first opening;

[0110] Within a preset second time period, if the water temperature entering the stack and the upper limit threshold meet the second target condition, the second opening is adjusted and updated to obtain an updated second opening; wherein the second time period occurs after the first time period.

[0111] Among them, the first duration and the second duration are both preset durations, and the first duration may be equal to the second duration, for example, the first duration is 3 seconds and the second duration is 3 seconds. The first duration may also be different from the second duration, for example, the first duration is 3 seconds and the second duration is 2 seconds. However, the values ​​of the first duration and the second duration are also determined according to the length of the thermal management system pipeline, and the specific reference is as mentioned above.

[0112] In this embodiment, within the first time period, the lowest temperature of the water entering the stack is first determined. The lowest temperature refers to the lowest value of the water entering the stack collected within the first time period. Then the temperature difference between the lowest temperature and the lower threshold is calculated. If the temperature difference exceeds the preset target range, it means that the lowest temperature is far from the lower threshold and the lowest temperature is not near the lower threshold. At this time, the lowest temperature may be less than the lower threshold, or it may be greater than the lower threshold.

[0113] In this embodiment, it is hoped that the minimum temperature can be near the lower threshold within the first time period. If the temperature difference exceeds the preset target range, it means that the minimum temperature is not near the lower threshold, and the first target condition is met. At this time, it means that the first opening is too large or too small, and the first opening needs to be adjusted and updated.

[0114] When adjusting and updating the first opening, it is necessary to obtain the radiator outlet water temperature first;

[0115] Then, the first opening is adjusted and updated according to the upper threshold, the lower threshold, the minimum temperature and the radiator outlet water temperature to obtain an updated first opening.

[0116] Specifically, the first difference is determined based on the upper threshold and the radiator outlet water temperature, and then the second difference is determined based on the lower threshold and the radiator outlet water temperature; the third difference is determined based on the minimum temperature and the radiator outlet water temperature; finally, the updated first opening can be determined based on the first difference, the second difference and the third difference.

[0117] In one embodiment, the first opening degree may be adjusted and updated with reference to the following formula:

[0118]

[0119] Among them, K 第一新 is the first opening after update, K 第一 is the first opening before updating, T2 is the upper threshold, T1 is the lower threshold, T 散 is the radiator outlet water temperature, T min is the lowest temperature.

[0120] It should be noted that the updated first opening is used to adjust the temperature control valve in the subsequent process. When the first target condition is met, it is necessary to pay attention to whether the stack is less than the lower limit threshold. If it is in this case, it is necessary to determine whether the water temperature entering the stack is too low. Specifically, the minimum temperature can be compared with the preset low temperature threshold. If the minimum temperature is less than the preset low temperature threshold, the temperature control valve needs to be controlled to close, that is, the opening of the temperature control valve is 0 degrees, so as to increase the small circulation flow, reduce the heat dissipation of the cooling water, and make the water temperature entering the stack return to a reasonable range, that is, the water temperature entering the stack needs to be greater than the lower limit threshold for subsequent adjustment and control. At the same time, the 1 second after the water temperature entering the stack is greater than the lower limit threshold is updated as the target time, and the water temperature entering the stack at the target time is updated to the minimum temperature. After the water temperature entering the stack is greater than the lower limit threshold, the temperature control valve can be controlled to reopen to the second opening.

[0121] In addition, if the temperature difference is within the preset target range, it means that the lowest temperature is near the lower limit threshold. At this time, the first target condition is not met. There is no need to adjust and update the first opening. The water temperature entering the reactor is directly monitored within the preset second time period to determine whether the second target condition is met. The specific steps may include:

[0122] Detect whether the water temperature entering the reactor decreases within the second time period;

[0123] If a decrease in the water temperature entering the stack is detected within the second time period, the second opening is used as the target opening, and an opening reduction updating step is performed on the target opening, wherein the opening reduction updating step includes:

[0124] The target opening is controlled to decrease to obtain a reduced opening, and the temperature control valve is controlled to open to the reduced opening. If a decrease in the water temperature entering the reactor is detected within the next second time period, the reduced opening is used as the target opening, and the opening reduction update step is performed again;

[0125] If it is detected within the next second time period that the water temperature entering the stack has not decreased, the updated second opening degree is determined based on the reduced opening degree.

[0126] Specifically, if the inlet water temperature is detected to drop within the second time period, it means that the second opening is too large and the inlet water temperature has not risen. In order to suppress the continuous drop in the inlet water temperature, the second opening needs to be updated by at least one round of reduction. It should be noted that after each round of reduction update, the inlet water temperature will be re-detected in the next second time period to see if it drops. The reduction update step will not be stopped until it is detected that the inlet water temperature no longer drops within the next second time period.

[0127] It should be noted that in the process of reduction and update, after each round of reduction and update, the reduced opening needs to be compared with the low temperature threshold to prevent excessive temperature drop. If the reduced opening is less than the low temperature threshold, the temperature control valve needs to be controlled to close, that is, the opening of the temperature control valve is 0 degrees, so as to increase the small circulation flow, reduce the heat dissipation of the cooling water, and make the inlet water temperature of the pile return to a reasonable range, that is, the water temperature of the pile needs to be greater than the lower limit threshold, so as to continue to adjust and control in the future. At the same time, the 1 second after the water temperature of the pile is greater than the lower limit threshold is updated as the target time, and the water temperature of the pile at the target time is updated to the lowest temperature. After the water temperature of the pile is greater than the lower limit threshold, the temperature control valve can be controlled to reopen to the reduced opening, and then detect whether the water temperature of the pile drops within the second time period.

[0128] In one embodiment, the second opening degree may be decreased and updated by the following formula:

[0129] K 第二新 =K 第二 +(αK 第二 +β)·v2

[0130] Among them, K 第二新 is the updated second opening, K 第二 The second opening before the bit is updated, α and β are parameters set in advance, and according to experience, they can be set to α=1, β=4, and v2 is the change rate of the water temperature entering the stack within the second time length.

[0131] In one embodiment, considering the hysteresis of the change of the water temperature entering the stack, in order to prevent the water temperature entering the stack from changing too quickly, it is also necessary to combine the change rate of the water temperature entering the stack to determine whether it is necessary to increase and update the water temperature entering the stack. The specific steps include:

[0132] If it is detected that the water temperature entering the stack has not decreased within the next second time period, then when the water temperature entering the stack rises back to the upper threshold, the target change rate of the water temperature entering the stack is calculated;

[0133] If the target change rate is greater than a preset rate threshold, the reduced opening is increased and updated to obtain an updated second opening.

[0134] It is not difficult to understand that if it is detected that the water temperature entering the reactor has not dropped within the next second time period, it means that the water temperature entering the reactor is rising. The target change rate refers to the rate at which the water temperature entering the reactor rises.

[0135] It should be noted that the time when the water temperature entering the reactor rises starts from the target time corresponding to the lowest temperature. Therefore, when calculating the target change rate, the starting calculation time is the target time corresponding to the lowest temperature, and the ending calculation time is the time when the water temperature entering the reactor reaches the upper threshold, refer to the following formula:

[0136]

[0137] Where v is the target change rate, T2 is the upper threshold, T min is the minimum temperature, t1 is the calculation termination time, and t0 is the target time. It should be noted that the target time and the minimum temperature are subject to the latest update.

[0138] In one embodiment, the second opening degree may be increased and updated by the following formula:

[0139] K 第二新 =K 第二 +(αK 第二 +β)·v

[0140] Among them, K is the updated second opening, K 第二 is the second opening before updating, α and β are parameters set in advance, which can be set to α=1, β=4 according to experience, and v is the target change rate

[0141] Finally, if the temperature of the water entering the reactor rises back to the upper threshold, the temperature control valve can be controlled to open to the updated first opening to increase the heat dissipation of the cooling water; and the following steps are repeated:

[0142] When the water temperature entering the reactor drops to the upper threshold, the temperature control valve is controlled to open to the second opening to reduce the heat dissipation of the cooling water;

[0143] In the process of reducing the heat dissipation of cooling water, if the water temperature entering the stack and the preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening.

[0144] This embodiment aims to maintain the water temperature entering the stack within a suitable working range of the stack, among which the two core parameters are the opening of the temperature control valve, namely the first opening and the second opening. The second opening can make the water temperature entering the stack rise slowly or stabilize at a suitable value, and the initial value is obtained by looking up the table; the first opening can reduce the water temperature when the temperature is too high, and at the same time, the water temperature will not drop too low due to the hysteresis of the water temperature response entering the stack. In fact, this embodiment does not require high initial value settings for the first opening and the second opening, and the parameters α and β in the second opening iteration formula do not need to be set too accurately. The example α=1, β=4 can meet most situations. The traditional control method generally has high requirements for the initial value table lookup of the temperature control valve, and the default initial value is selected for each switch reset (bad settings can easily cause the water temperature to fail to rise to a suitable temperature or fluctuate greatly), while in this embodiment, the initial value is only set in the startup stage, and then the adaptive process is performed. Because both the water temperature out of the stack and the large circulation water temperature will follow a gradual rise, and the ambient temperature generally does not change, it is better to make an adaptive judgment than to look up the table to obtain the temperature control valve opening based on many factors and variables. Although maintaining the cooling water temperature stable requires a high degree of the second opening, the control of the first opening is relatively simple and has few influencing factors. When the first opening can roughly meet the requirements, the second opening can gradually adapt to external conditions. Especially when the fuel cell system is installed on the vehicle, it is in a low-power operation state most of the time, but the actual component structure will be different. The solution of this embodiment is more advantageous than the traditional solution. In addition, compared to looking up the table to get the initial value, PID control is performed all the time in a shorter temperature range. The solution of this embodiment is more practical to iterate the temperature control valve opening according to the change of the water temperature in the cold zone in the entire range, and the loss of components is also smaller.

[0145] In summary, a fuel cell thermal management system control method provided in an embodiment of the present specification obtains the inlet water temperature of the cooling water in the fuel cell thermal management system after the fuel cell stack starts working; if the inlet water temperature is greater than the preset upper threshold, the temperature control valve is controlled to open to the first opening to increase the heat dissipation of the cooling water; when the inlet water temperature drops to the upper threshold, the temperature control valve is controlled to open to the second opening to reduce the heat dissipation of the cooling water, and the second opening is less than the first opening; in the process of reducing the heat dissipation of the cooling water, if the inlet water temperature and the preset lower threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain the updated first opening and the updated second opening, and the temperature control valve is controlled based on the updated first opening and the updated second opening. In this way, the inlet water temperature is controlled by controlling the opening of the temperature control valve, and the initial value selection of the temperature control valve is insensitive. Through the later water temperature changes, the temperature control valve can be quickly adjusted to the most suitable opening, thereby controlling the water temperature change speed. The temperature control valve will not change too frequently, greatly reducing the loss of components.

[0146] Based on the same inventive concept, combined Figure 3 As shown, an embodiment of the present invention further provides a fuel cell thermal management system control device, comprising:

[0147] An acquisition module, used to acquire the inlet water temperature of cooling water in the fuel cell thermal management system after the fuel cell stack starts to work;

[0148] A first opening module is used to control the temperature control valve to open to a first opening degree to increase the heat dissipation of cooling water when the water temperature entering the stack is greater than a preset upper limit threshold;

[0149] a second opening module, configured to control the temperature control valve to open to a second opening degree when the water temperature entering the stack drops to the upper limit threshold, so as to reduce the heat dissipation of cooling water, wherein the second opening degree is smaller than the first opening degree;

[0150] A control module is used to adjust and update the first opening and the second opening to obtain an updated first opening and an updated second opening if the water temperature entering the stack and a preset lower limit threshold meet the target conditions during the process of reducing the heat dissipation of the cooling water, and control the temperature control valve based on the updated first opening and the updated second opening.

[0151] Optionally, the control module is further configured to:

[0152] Within a preset first time period, if the water temperature entering the stack and the lower limit threshold satisfy a first target condition, obtaining the water temperature at the radiator outlet;

[0153] According to the upper threshold, the lower threshold and the radiator outlet water temperature, the first opening is adjusted and updated to obtain the updated first opening;

[0154] Within a preset second time period, if the water temperature entering the stack and the upper limit threshold meet a second target condition, the second opening is adjusted and updated to obtain the updated second opening; wherein the second time period occurs after the first time period.

[0155] Optionally, the control module is further configured to:

[0156] Determining the lowest temperature of the water entering the reactor within the first time period;

[0157] If the temperature difference between the minimum temperature and the lower limit threshold exceeds a preset target range, the first target condition is met, and the radiator outlet water temperature is obtained;

[0158] The first opening is adjusted and updated according to the upper threshold, the lower threshold, the minimum temperature and the radiator outlet water temperature to obtain the updated first opening.

[0159] Optionally, the control module is further configured to:

[0160] Determining a first difference value according to the upper threshold value and the radiator outlet water temperature;

[0161] Determining a second difference value according to the lower limit threshold and the radiator outlet water temperature;

[0162] Determining a third difference value according to the minimum temperature and the radiator outlet water temperature;

[0163] The updated first opening degree is determined according to the first difference, the second difference and the third difference.

[0164] Optionally, the control module is further configured to:

[0165] If the minimum temperature is lower than a preset low temperature threshold, the temperature control valve is controlled to close to reduce the heat dissipation of the cooling water;

[0166] After the inlet water temperature is greater than the lower limit threshold, the temperature control valve is controlled to open to the second opening degree.

[0167] Optionally, the control module is further configured to:

[0168] detecting whether the water temperature entering the stack decreases within the second time period;

[0169] If it is detected that the inlet water temperature decreases within the second time period, the second opening is used as the target opening, and an opening reduction updating step is performed on the target opening, wherein the opening reduction updating step includes:

[0170] Controlling the target opening to decrease, obtaining a decreased opening, controlling the temperature control valve to open to the decreased opening, and if a decrease in the inlet water temperature is detected within the next second time period, taking the decreased opening as the target opening, and executing the opening decrease update step again;

[0171] If it is detected within the next second time period that the water temperature entering the stack has not decreased, the updated second opening degree is determined based on the reduced opening degree.

[0172] Optionally, the control module is further configured to:

[0173] If it is detected that the water temperature entering the stack has not decreased within the next second time period, then when the water temperature entering the stack rises back to the upper limit threshold, a target change rate of the water temperature entering the stack is calculated;

[0174] If the target change rate is greater than a preset rate threshold, the reduced opening is increased and updated to obtain the updated second opening.

[0175] Optionally, the acquisition module is also used to:

[0176] Obtain the battery stack power, accessory power consumption and radiator outlet water temperature;

[0177] Based on the radiator outlet water temperature and the stack inlet water temperature, a first opening is determined by searching in a preset first relationship table; wherein the first relationship table includes a temperature difference and a target first opening corresponding to the temperature difference, and the temperature difference is the difference between the stack inlet water temperature and the radiator outlet water temperature;

[0178] Based on the battery stack power, the accessory loss and power consumption, the radiator outlet water temperature and the stack inlet water temperature, a second opening is determined by searching in a preset second relationship table; wherein, the second relationship table includes the power difference and the temperature difference, and the second relationship table also includes a target second opening corresponding to the power difference and the temperature difference, and the power difference is the difference between the battery stack power and the accessory loss and power consumption.

[0179] Optionally, the control module is further configured to:

[0180] If the inlet water temperature rises back to the upper limit threshold, the temperature control valve is controlled to open to the updated first opening to increase the heat dissipation of the cooling water;

[0181] When the water temperature entering the stack drops to the upper limit threshold, the temperature control valve is controlled to open to the second opening to reduce the heat dissipation of the cooling water;

[0182] In the process of reducing the heat dissipation of cooling water, if the water temperature entering the stack and a preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening.

[0183] Optionally, the first opening module is further used for:

[0184] Get the radiator outlet water temperature;

[0185] If the radiator outlet water temperature is greater than or equal to a preset lower threshold, the temperature control valve is controlled to be fully opened;

[0186] If the radiator outlet water temperature is less than the lower threshold, the stack inlet water temperature is compared with the upper threshold.

[0187] Optionally, the first opening module is further used for:

[0188] Acquire an initial opening, and control the temperature control valve to open to the initial opening;

[0189] If the water temperature entering the stack decreases within the preset third time period, the initial opening degree is used as the first opening degree;

[0190] If the inlet water temperature rises within the third time period, the initial opening is used as a revised opening, and an increasing and updating step is performed on the revised opening, wherein the increasing and updating step includes:

[0191] The corrected opening is controlled to increase to obtain an increased opening, and the temperature control valve is controlled to open to the increased opening. If a rise in the water temperature entering the stack is detected within the next third time period, the increased opening is used as the corrected opening, and the increase and update step is performed again; if no rise in the water temperature entering the stack is detected within the next third time period, the increased opening is used as the first opening.

[0192] Optionally, the acquisition module is also used to:

[0193] If the inlet water temperature is less than or equal to the upper limit threshold, the temperature control valve is controlled to close.

[0194] In summary, a fuel cell thermal management system control device provided in an embodiment of the present specification obtains the inlet water temperature of the cooling water in the fuel cell thermal management system after the fuel cell stack starts working; if the inlet water temperature is greater than the preset upper threshold, the temperature control valve is controlled to open to the first opening to increase the heat dissipation of the cooling water; when the inlet water temperature drops to the upper threshold, the temperature control valve is controlled to open to the second opening to reduce the heat dissipation of the cooling water, and the second opening is less than the first opening; in the process of reducing the heat dissipation of the cooling water, if the inlet water temperature and the preset lower threshold meet the target condition, the first opening and the second opening are adjusted and updated to obtain the updated first opening and the updated second opening, and the temperature control valve is controlled based on the updated first opening and the updated second opening. In this way, the inlet water temperature is controlled by controlling the opening of the temperature control valve, and the initial value selection of the temperature control valve is insensitive. Through the later water temperature change, the temperature control valve can be quickly adjusted to the most suitable opening, thereby controlling the water temperature change speed. The temperature control valve will not change too frequently, which greatly reduces the wear and tear of components.

[0195] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the fuel cell thermal management system control device described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0196] According to the third aspect of the present invention, a controller is provided, which includes a fuel cell thermal management system control device, a memory, a processor and a communication unit. The memory stores machine-readable instructions executable by the processor. When the controller is running, the processor and the memory communicate through a bus, the processor executes the machine-readable instructions, and executes the fuel cell thermal management system control method.

[0197] The memory, processor and communication unit components are electrically connected to each other directly or indirectly to achieve signal transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The fuel cell thermal management system control device includes at least one software function module that can be stored in the memory in the form of software or firmware. The processor is used to execute the executable module stored in the memory (for example, the software function module or computer program included in the fuel cell thermal management system control device).

[0198] Among them, the memory can be, but is not limited to, random access memory (Random Access Memory, RAM), read-only memory (Read On ly Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable read-only memory (Electrical Erasable Programmable Read-Only Memory, EEPROM), etc.

[0199] In some embodiments, the processor is used to perform one or more functions described in this embodiment. In some embodiments, the processor may include one or more processing cores (eg, a single-core processor (S) or a multi-core processor (S)).

[0200] In this embodiment, the memory is used to store the program, and the processor is used to execute the program after receiving the execution instruction. The process definition method disclosed in any implementation of this embodiment can be applied to the processor, or implemented by the processor.

[0201] The communication unit is used to establish a communication connection between the controller and other devices through the network, and to send and receive data through the network.

[0202] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the controller described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0203] According to a fourth aspect of the present invention, a vehicle is provided, comprising a vehicle body, a fuel cell installed in the vehicle body, and a controller installed in the vehicle body, wherein the controller is used to implement the aforementioned fuel cell thermal management system control method.

[0204] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the controller of the vehicle described above can refer to the corresponding process in the aforementioned method, and will not be elaborated here.

[0205] The above are only various embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A fuel cell thermal management system control method, characterized in that: include: After the fuel cell stack starts to work, the inlet water temperature of the cooling water in the fuel cell thermal management system is obtained; If the water temperature entering the stack is greater than a preset upper threshold, the temperature control valve is controlled to open to a first opening to increase heat dissipation to the cooling water; When the inlet water temperature drops to the upper limit threshold, the temperature control valve is controlled to open to a second opening degree to reduce the heat dissipation of cooling water, and the second opening degree is smaller than the first opening degree; In the process of reducing the heat dissipation of cooling water, if the water temperature entering the stack and a preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening, and the temperature control valve is controlled based on the updated first opening and the updated second opening.

2. The method according to claim 1, characterized in that: If the water temperature entering the stack and a preset lower limit threshold value meet the target condition, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening, including: Within a preset first time period, if the water temperature entering the stack and the lower limit threshold satisfy a first target condition, obtaining the water temperature at the radiator outlet; According to the upper threshold, the lower threshold and the radiator outlet water temperature, the first opening is adjusted and updated to obtain the updated first opening; Within a preset second time period, if the water temperature entering the stack and the upper limit threshold meet a second target condition, the second opening is adjusted and updated to obtain the updated second opening; wherein the second time period occurs after the first time period.

3. The method according to claim 2, characterized in that The step of obtaining the radiator outlet water temperature if the inlet water temperature and the preset lower threshold value meet the first target condition within the preset first time period, and adjusting and updating the first opening degree according to the upper threshold value, the lower threshold value and the radiator outlet water temperature to obtain the updated first opening degree includes: Determining the lowest temperature of the water entering the reactor within the first time period; If the temperature difference between the minimum temperature and the lower limit threshold exceeds a preset target range, the first target condition is met, and the radiator outlet water temperature is obtained; The first opening is adjusted and updated according to the upper threshold, the lower threshold, the minimum temperature and the radiator outlet water temperature to obtain the updated first opening.

4. The method according to claim 3, characterized in that The adjusting and updating the first opening according to the upper threshold, the lower threshold, the minimum temperature and the radiator outlet water temperature to obtain the updated first opening includes: Determining a first difference value according to the upper threshold value and the radiator outlet water temperature; Determining a second difference value according to the lower limit threshold and the radiator outlet water temperature; Determining a third difference value according to the minimum temperature and the radiator outlet water temperature; The updated first opening degree is determined according to the first difference, the second difference and the third difference.

5. The method according to claim 3, characterized in that: The method further comprises: If the minimum temperature is lower than a preset low temperature threshold, the temperature control valve is controlled to close to reduce the heat dissipation of the cooling water; After the inlet water temperature is greater than the lower limit threshold, the temperature control valve is controlled to open to the second opening degree.

6. The method according to claim 2, characterized in that The method further comprises: if the water temperature entering the stack and the upper threshold value meet a second target condition within the preset second time period, adjusting and updating the second opening to obtain the updated second opening, including: detecting whether the water temperature entering the stack decreases within the second time period; If it is detected that the inlet water temperature decreases within the second time period, the second opening is used as the target opening, and an opening reduction updating step is performed on the target opening, wherein the opening reduction updating step includes: Controlling the target opening to decrease, obtaining a decreased opening, controlling the temperature control valve to open to the decreased opening, and if a decrease in the inlet water temperature is detected within the next second time period, taking the decreased opening as the target opening, and executing the opening decrease update step again; If it is detected within the next second time period that the water temperature entering the stack has not decreased, the updated second opening degree is determined based on the reduced opening degree.

7. The method according to claim 6, characterized in that If it is detected within the next second time period that the water temperature entering the stack has not decreased, determining the updated second opening degree according to the reduced opening degree includes: If it is detected that the water temperature entering the stack has not decreased within the next second time period, then when the water temperature entering the stack rises back to the upper limit threshold, a target change rate of the water temperature entering the stack is calculated; If the target change rate is greater than a preset rate threshold, the reduced opening is increased and updated to obtain the updated second opening.

8. The method according to claim 1, characterized in that After the step of obtaining the inlet water temperature of cooling water in the fuel cell thermal management system after the fuel cell stack starts to work, the method further includes: Obtain the battery stack power, accessory power consumption and radiator outlet water temperature; Based on the radiator outlet water temperature and the stack inlet water temperature, a first opening is determined by searching in a preset first relationship table; wherein the first relationship table includes a temperature difference and a target first opening corresponding to the temperature difference, and the temperature difference is the difference between the stack inlet water temperature and the radiator outlet water temperature; Based on the battery stack power, the accessory loss and power consumption, the radiator outlet water temperature and the stack inlet water temperature, a second opening is determined by searching in a preset second relationship table; wherein, the second relationship table includes the power difference and the temperature difference, and the second relationship table also includes a target second opening corresponding to the power difference and the temperature difference, and the power difference is the difference between the battery stack power and the accessory loss and power consumption.

9. The method according to claim 1, characterized in that: The controlling the temperature control valve based on the updated first opening and the updated second opening includes: If the inlet water temperature rises back to the upper limit threshold, the temperature control valve is controlled to open to the updated first opening to increase the heat dissipation of the cooling water; When the water temperature entering the stack drops to the upper limit threshold, the temperature control valve is controlled to open to the second opening to reduce the heat dissipation of the cooling water; In the process of reducing the heat dissipation of cooling water, if the water temperature entering the stack and a preset lower limit threshold meet the target conditions, the first opening and the second opening are adjusted and updated to obtain an updated first opening and an updated second opening.

10. The method according to claim 1, characterized in that Before the step of controlling the temperature control valve to open to a first opening to increase heat dissipation of cooling water if the water temperature entering the stack is greater than a preset upper limit threshold, the method further includes: Get the radiator outlet water temperature; If the radiator outlet water temperature is greater than or equal to a preset lower threshold, the temperature control valve is controlled to be fully opened; If the radiator outlet water temperature is less than the lower threshold, the stack inlet water temperature is compared with the upper threshold.

11. The method according to claim 1, characterized in that: Before controlling the temperature control valve to open to the first opening degree, the method further includes: Acquire an initial opening, and control the temperature control valve to open to the initial opening; If the water temperature entering the stack decreases within the preset third time period, the initial opening degree is used as the first opening degree; If the inlet water temperature rises within the third time period, the initial opening is used as a revised opening, and an increasing and updating step is performed on the revised opening, wherein the increasing and updating step includes: The corrected opening is controlled to increase to obtain an increased opening, and the temperature control valve is controlled to open to the increased opening. If a rise in the water temperature entering the stack is detected within the next third time period, the increased opening is used as the corrected opening, and the increase and update step is performed again; if no rise in the water temperature entering the stack is detected within the next third time period, the increased opening is used as the first opening.

12. The method according to claim 1, characterized in that After the step of obtaining the inlet water temperature of cooling water in the fuel cell thermal management system, the method further comprises: If the inlet water temperature is less than or equal to the upper limit threshold, the temperature control valve is controlled to close.

13. A fuel cell thermal management system control device, characterized in that: include: An acquisition module, used to acquire the inlet water temperature of cooling water in the fuel cell thermal management system after the fuel cell stack starts to work; A first opening module is used to control the temperature control valve to open to a first opening degree to increase the heat dissipation of cooling water when the water temperature entering the stack is greater than a preset upper limit threshold; a second opening module, configured to control the temperature control valve to open to a second opening degree when the water temperature entering the stack drops to the upper limit threshold, so as to reduce the heat dissipation of the cooling water, wherein the second opening degree is smaller than the first opening degree; A control module is used to adjust and update the first opening and the second opening to obtain an updated first opening and an updated second opening, and control the temperature control valve based on the updated first opening and the updated second opening if the water temperature entering the stack and a preset lower limit threshold meet the target conditions during the process of reducing the heat dissipation of the cooling water.

14. A controller, characterized in that: The controller includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the fuel cell thermal management system control method described in any one of claims 1 to 13 is implemented.

15. A vehicle, characterized in that: The vehicle includes a vehicle body and a controller installed in the vehicle body, wherein the controller executes the fuel cell thermal management system control method according to any one of claims 1-13.

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