Decoupling control method and system of fuel cell cooling system, computer equipment and storage medium

Abstract

The invention relates to the technical field of fuel cells, and discloses a decoupling control method and system of a fuel cell cooling system, computer equipment and a storage medium, and the decoupling control method comprises the following control steps: obtaining pile target temperatures under different pile powers; setting a three-way valve target control temperature, a radiator target control temperature and a pile inlet cooling water target temperature according to the pile target temperature; obtaining the actual temperature of pile inlet cooling water; and when the actual temperature of the cooling water at the inlet of the electric pile is lower than the target control temperature of the radiator, the change of the actual temperature of the cooling water at the inlet of the electric pile is controlled by the three-way valve, and when the actual temperature of the cooling water at the inlet of the electric pile is changed, the change of the actual temperature of the cooling water at the inlet of the electric pile is controlled by the three-way valve. The three-way valve and the radiator can respectively and specifically adjust the actual temperature of cooling water at an electric pile inlet, so that the coupling effect between the three-way valve and the radiator is reduced to the minimum.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a decoupling control method, system, computer equipment and storage medium for a fuel cell cooling system. Background Art

[0002] The target operating temperature of a fuel cell is not fixed, but is related to the operating power. Generally speaking, from the perspective of water and heat management, the higher the operating power, the higher the target operating temperature (there is an upper limit).

[0003] The fuel cell cooling system generally includes a large cycle and a small cycle. The large cycle passes through the radiator, and the small cycle bypasses the radiator. The flow distribution between the large and small cycles is controlled by a three-way valve. When the fuel cell is running at power, the temperature control of the stack cooling water inlet is achieved by jointly controlling the radiator fan speed and the three-way valve opening.

[0004] The combined control of the electric three-way valve and the radiator must meet the temperature control requirements under operating conditions including cold start of the fuel cell, cold temperature increase and variable power operation, as well as adaptability in high / low temperature environments.

[0005] However, since the three-way valve and the radiator are easily coupled in control, the actual temperature of the cooling water at the inlet of the fuel cell stack fluctuates greatly, which affects the temperature inside the fuel cell stack and the stability of the fuel cell system. Summary of the invention

[0006] The present invention aims to solve the above-mentioned problems and provides a decoupling control method, system, computer equipment and storage medium for a fuel cell cooling system, so as to solve the problem that the three-way valve and the radiator in the existing cooling system are easily coupled in control, resulting in large fluctuations in the cooling water temperature regulation and affecting the temperature stability inside the fuel cell stack.

[0007] To achieve this object, the present invention adopts the following technical solutions: A decoupling control method for a fuel cell cooling system comprises the following control steps: Obtain the target temperature of the battery stack at different battery stack powers; Set the three-way valve target control temperature, radiator target control temperature and stack inlet cooling water target temperature according to the stack target temperature; Among them, the target control temperature of the three-way valve is lower than the target control temperature of the radiator; Get the actual temperature of the cooling water at the stack inlet; When the actual temperature of the cooling water at the inlet of the stack is lower than the target control temperature of the three-way valve, the three-way valve controls the change of the actual temperature of the cooling water at the inlet of the stack; When the actual temperature of the cooling water at the inlet of the stack is between the target control temperature of the three-way valve and the target control temperature of the radiator, the change of the actual temperature of the cooling water at the inlet of the stack is controlled by the three-way valve and the radiator together; When the actual temperature of the cooling water at the inlet of the fuel cell stack is maintained consistent with the target control temperature of the radiator, the change of the actual temperature of the cooling water at the inlet of the fuel cell stack is controlled by the radiator.

[0008] Preferably, the three-way valve target control temperature is achieved by controlling the opening of the three-way valve, and the three-way valve opening control includes three-way valve feedforward control and three-way valve PID control; The three-way valve feedforward control controls the opening of the three-way valve based on the actual temperature of the cooling water at the stack inlet; The three-way valve PID control controls the opening of the three-way valve based on the target temperature of the cooling water at the inlet of the stack, the target temperature difference △T and the actual temperature of the cooling water at the inlet of the stack; Among them, the target temperature difference △T is 2℃ to -5℃.

[0009] Preferably, the upper limit value of the three-way valve feedforward control output is the maximum opening value of the three-way valve, and the lower limit value of the output is the minimum opening value of the three-way valve; The upper limit of the three-way valve PID control output is the positive value of the three-way valve opening, and the lower limit of the output is the minimum opening value of the three-way valve; The sum of the three-way valve feedforward control output upper limit value and the three-way valve PID control output upper limit value is greater than the three-way valve maximum opening value; Among them, the maximum opening value is 100%, the minimum opening value is 0, and the positive opening value is 60% to 80%.

[0010] Preferably, the radiator target control temperature is achieved by controlling the speed of the radiator, and the speed control of the radiator includes radiator feedforward control and radiator PID control; The radiator feedforward control controls the radiator speed based on the stack power and ambient temperature; The radiator PID control controls the speed of the radiator based on the target temperature of the cooling water at the stack inlet and the actual temperature of the cooling water at the stack inlet.

[0011] Preferably, the upper limit value of the radiator feedforward control output is a positive value of the radiator speed, and the lower limit value of the output is a minimum value of the radiator speed; The upper limit of the radiator PID control output is the positive value of the radiator speed, and the lower limit of the output is the negative value of the radiator speed; The sum of the radiator feedforward control and the radiator PID control output can reach the maximum radiator speed; Among them, the positive value of the speed is 40% to 60%, the negative value of the speed is -20% to -10%, the minimum value of the speed is 0, and the maximum value of the speed is 100%.

[0012] Preferably, when the fuel cell system is in the shutdown stage, the cooling system includes the following control steps: The water pump is in the off state, the radiator is in the off state, the three-way valve is in the state where the large circulation is fully closed and the small circulation is fully open.

[0013] Preferably, when the fuel cell system is in a cold start-up phase, the cooling system includes the following control steps: Turn on the water pump, the radiator is in the closed state, the three-way valve is in the state of large circulation fully closed and small circulation fully open, and the cooling water temperature rises; Set the three-way valve opening temperature T1; When the actual temperature of the cooling water at the stack inlet reaches the three-way valve opening temperature T1, the three-way valve feedforward control is turned on and the opening value of the three-way valve is controlled; When the actual temperature of the cooling water at the stack inlet reaches the target control temperature of the three-way valve, the three-way valve PID control is turned on, and the three-way valve PID control adjusts and maintains the three-way valve to the maximum opening value; During the process of adjusting the three-way valve to the maximum opening value, the radiator feedforward control is turned on and the speed of the radiator is controlled; When the actual temperature of the cooling water at the inlet of the fuel cell stack reaches the target control temperature of the radiator, the radiator PID control is turned on and the speed of the radiator is controlled to maintain the actual temperature of the cooling water at the inlet of the fuel cell stack consistent with the target control temperature of the radiator.

[0014] Preferably, when the fuel cell system is in the variable power operation stage, the cooling system includes the following control steps: Based on the three-way valve feedforward control and three-way valve PID control, the three-way valve continuously maintains the maximum opening value; Based on radiator feedforward control and radiator PID control, the radiator maintains the actual temperature of the cooling water at the stack inlet consistent with the radiator target control temperature.

[0015] Preferably, when the fuel cell is in a low-temperature and low-power operation stage, the cooling system includes the following control steps: If the actual temperature of the cooling water at the stack inlet is between the radiator control target temperature and the three-way valve control target temperature, the radiator PID control is turned off, the three-way valve maintains the maximum opening value, and the radiator feedforward control output is adjusted to the fan speed corresponding to the current stack power; If the actual temperature of the cooling water at the stack inlet is lower than the target temperature controlled by the three-way valve, stop the radiator and adjust the PID control output of the three-way valve to the minimum opening value of the three-way valve, and adjust the feedforward control output of the three-way valve to the opening value corresponding to the target control temperature of the three-way valve.

[0016] A decoupling control system for a fuel cell cooling system, applied to the above-mentioned decoupling control method, comprises: A parameter module is used to obtain various operating parameters in the fuel cell system and calculate the judgment data through the obtained operating parameters; A judgment module, used to receive the judgment data from the parameter module and identify the current operating state of the fuel cell system through the judgment data; The control module is used to receive the signal from the judgment module and adjust the parameters of each component in the cooling system according to the signal of the judgment module so that the actual temperature of the cooling water at the inlet of the battery stack is consistent with the target control temperature of the radiator.

[0017] A computer device comprising: Memory and processor; The memory is used to store at least one program; When the program is executed by a processor, the processor implements the above control method.

[0018] A storage medium includes a computer program, and the computer program implements the above control method when executed by a processor.

[0019] The contribution of the present invention is that the present invention sets a difference between the target control temperature of the three-way valve and the target control temperature of the radiator, so that when the actual temperature of the cooling water at the inlet of the fuel cell stack changes, the three-way valve and the radiator can respectively and specifically adjust the actual temperature of the cooling water at the inlet of the fuel cell stack, thereby ensuring that the coupling effect between the three-way valve and the radiator is minimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic flow chart of the decoupling control method of the cooling system of the present invention; Figure 2 It is a schematic diagram of the structure of the battery stack and the cooling system of the present invention; Figure 3 It is the control logic general diagram of the three-way valve and the radiator of the present invention; Figure 4 It is a schematic diagram of the output value range of the three-way valve feedforward control and the three-way valve PID control of the present invention; Figure 5 It is a schematic diagram of the output value range of the radiator feedforward control and the radiator PID control of the present invention; Figure 6 It is a schematic diagram of the control changes of the actual temperature of the radiator, the three-way valve and the cooling water at the inlet of the stack in the fuel cell system of the present invention at different working stages; Figure 7 is a schematic diagram of a decoupling system of the present invention; Figure 8 It is a structural schematic diagram of the computer device and storage medium in the present invention. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The drawings provide embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing the embodiments of the present invention and are not intended to limit this application.

[0023] It is understood that the terms "first", "second", etc. used in this application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if there is a transmission of electrical signals or data between the connected objects.

[0024] When used herein, the singular forms "a", "a person" and "the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0025] To facilitate understanding of the fuel cell system and cooling system, a brief description of the fuel cell stack and cooling system is given here.

[0026] The cooling system is used to adjust the temperature of the battery stack. The cooling system mainly includes a three-way valve, a radiator, a water pump and a temperature sensor, such as Figure 2 As shown ( Figure 2 In the figure, F is the battery stack, P is the water pump, S is the radiator, M is the three-way valve, and T is the temperature sensor). The three-way valve, radiator and water pump are connected between the inlet and outlet of the battery stack in sequence, and a temperature sensor is also arranged between the three-way valve (electric) and the battery stack inlet; the three-way valve includes an A end, a B end and a C end, wherein the A end is connected to the radiator, the B end is connected to the radiator and the water pump respectively, and the C end is connected to the temperature sensor. The coolant flows out from the battery stack outlet and passes through the water pump, the radiator (the large cycle passes, the small cycle does not pass), the three-way valve and the temperature sensor in sequence and flows into the battery stack inlet, thereby completing the regulation of the temperature inside the battery stack.

[0027] To further explain, the temperature control methods of the cooling system mainly include two methods: large-circulation control and small-circulation control. Specifically, when the large-circulation controls the temperature, the B end of the three-way valve is closed, and the A end and the C end are connected. The cooling water enters and exits the fuel cell stack through the water pump, the radiator, and the A end and the C end of the three-way valve, and the temperature of the fuel cell stack is regulated; when the small-circulation controls the temperature, the A end of the three-way valve is closed, and the B end and the C end are connected. The cooling water enters and exits the fuel cell stack through the water pump, the B end and the C end of the three-way valve, and the temperature of the fuel cell stack is regulated.

[0028] Existing cooling systems all control the actual temperature of the cooling water at the stack inlet by jointly controlling the radiator fan speed and the three-way valve opening value. However, since the three-way valve and the radiator are easily coupled in control, the actual temperature of the cooling water at the stack inlet fluctuates greatly, which affects the temperature control inside the stack and the stability of the fuel cell system.

[0029] Furthermore, the opening value of the three-way valve is explained here. When the opening value of the three-way valve is 0 (minimum opening value), end A is closed, and ends B and C are connected, which is a small circulation mode. When the opening value of the three-way valve is 100% (maximum opening value), end B is closed, and ends A and C are connected, which is a large circulation mode. When the opening value of the three-way valve is between 0-100%, the small circulation mode and the large circulation mode exist at the same time.

[0030] The present invention adopts a decoupling control method for a fuel cell cooling system, which can significantly reduce the coupling effect between the three-way valve and the radiator, and ensure the stable operation of the fuel cell system. Specifically, Figure 1 As shown, the decoupling control method of the present invention includes the following control steps: Obtain the target temperature of the battery stack at different battery stack powers; Set the three-way valve target control temperature, radiator target control temperature and stack inlet cooling water target temperature according to the stack target temperature; Among them, the target control temperature of the three-way valve is lower than the target control temperature of the radiator (the difference is between 2°C and -5°C, which is convenient for the subsequent three-way valve and radiator to perform single variable control on the actual temperature of the cooling water at the inlet of the stack respectively); Get the actual temperature of the cooling water at the stack inlet; When the actual temperature of the cooling water at the inlet of the stack is lower than the target control temperature of the three-way valve, the three-way valve controls the change of the actual temperature of the cooling water at the inlet of the stack; When the actual temperature of the cooling water at the inlet of the stack is between the target control temperature of the three-way valve and the target control temperature of the radiator (this time period is extremely short, usually only 3s-5s, and the coupling time of the three-way valve and the radiator is short), the three-way valve and the radiator jointly control the change of the actual temperature of the cooling water at the inlet of the stack; When the actual temperature of the cooling water at the inlet of the fuel cell stack is consistent with the target control temperature of the radiator (the target control temperature of the radiator is also consistent with the target temperature of the fuel cell stack), the change of the actual temperature of the cooling water at the inlet of the fuel cell stack is controlled by the radiator.

[0031] The present invention sets a difference between the target control temperature of the three-way valve and the target control temperature of the radiator, so that when the actual temperature of the cooling water at the inlet of the fuel cell stack changes, the three-way valve and the radiator can respectively and specifically adjust the actual temperature of the cooling water at the inlet of the fuel cell stack, thereby ensuring that the coupling effect between the three-way valve and the radiator is minimized.

[0032] Further description of the target control temperature of the three-way valve in this embodiment, specifically, as follows Figure 3 As shown, the three-way valve target control temperature is achieved by controlling the opening of the three-way valve, and the three-way valve opening control includes three-way valve feedforward control and three-way valve PID control; The three-way valve feedforward control controls the opening of the three-way valve based on the actual temperature of the cooling water at the stack inlet; The three-way valve PID control controls the opening value of the three-way valve based on the target temperature of the cooling water at the inlet of the stack, the target temperature difference △T and the actual temperature of the cooling water at the inlet of the stack; Among them, the target temperature difference △T is 2℃ to -5℃.

[0033] Further explanation, such as Figure 4 As shown, the upper limit value of the three-way valve feedforward control output is the maximum opening value of the three-way valve, and the lower limit value of the output is the minimum opening value of the three-way valve; The upper limit of the three-way valve PID control output is the positive value of the three-way valve opening, and the lower limit of the output is the minimum opening value of the three-way valve; The sum of the three-way valve feedforward control output upper limit value and the three-way valve PID control output upper limit value is greater than the three-way valve maximum opening value; Among them, the maximum opening value is 100%, the minimum opening value is 0, and the positive opening value is 60% to 80%.

[0034] Further explanation: the sum of the upper limit value of the three-way valve feedforward control output and the upper limit value of the three-way valve PID control output is 160%-180%, which exceeds the maximum opening value of the three-way valve of 100%, that is, the oversaturation setting, thereby ensuring that when the radiator adjusts the actual temperature of the cooling water at the inlet of the fuel cell stack, the opening value of the three-way valve always remains at 100%, and the opening value of the three-way valve will not change, that is, the flow through the three-way valve will not fluctuate, ensuring that the coupling effect caused by the three-way valve when the radiator regulates the temperature of the cooling water is minimized.

[0035] Further description of the target control temperature of the radiator in this embodiment, specifically, as follows Figure 3As shown, the radiator target control temperature is achieved by the radiator speed control, and the radiator speed control includes radiator feedforward control and radiator PID control; The radiator feedforward control controls the radiator speed based on the stack power and ambient temperature; The radiator PID control controls the speed of the radiator based on the target temperature of the cooling water at the stack inlet and the actual temperature of the cooling water at the stack inlet.

[0036] like Figure 5 As shown, the upper limit value of the radiator feedforward control output is the positive value of the radiator speed, and the lower limit value of the output is the minimum value of the radiator speed; The upper limit of the radiator PID control output is the positive value of the radiator speed, and the lower limit of the output is the negative value of the radiator speed (the negative value here is the process value, not the final control value sent to the radiator. The final control value of the radiator is limited to between 0-100%). The sum of the radiator feedforward control and the radiator PID control output can reach the maximum radiator speed; Among them, the positive value of the speed is 40% to 60%, the negative value of the speed is -20% to -10%, the minimum value of the speed is 0, and the maximum value of the speed is 100%.

[0037] In this embodiment, the cooling system control method under different operation stages of the fuel cell system is explained. The above control methods are all based on three-way valve feedforward control, three-way valve PID control, radiator feedforward control and radiator PID control to regulate the opening value of the three-way valve and the speed of the radiator, so that the actual temperature of the cooling water at the stack inlet is maintained within an appropriate range.

[0038] Further explanation, when the fuel cell system is in the shutdown stage, the cooling system includes the following control steps: The water pump is in the off state, the radiator is in the off state, and the three-way valve is in the state of large cycle fully closed and small cycle fully open. Since the fuel cell system has not yet started, the cooling system does not need to be started at this time, so the water pump and radiator are kept in the off state, and the three-way valve is in the small cycle state (A end is closed, and B end and C end are connected).

[0039] like Figure 6 As shown, when the fuel cell system is in the cold start stage, the cooling system includes the following control steps: Turn on the water pump, the radiator is in the closed state, the three-way valve is in the state of large cycle fully closed and small cycle fully open; because the fuel cell is started at low temperature, the outside temperature is not high at this time, and the cooling water is also in a low temperature state. In order to quickly increase the temperature of the cooling water, it is necessary to start the water pump at this time. The water pump will drive the cooling water in and out of the stack, so that the cooling water can absorb the temperature inside the stack and quickly increase the temperature; Set the three-way valve opening temperature; When the actual temperature of the cooling water at the inlet of the fuel cell stack reaches the opening temperature of the three-way valve, the three-way valve feedforward control is turned on and the opening value of the three-way valve is controlled (the three-way valve PID control is not turned on at this time). The opening of the three-way valve is controlled by the three-way valve feedforward. At this time, some of the heated cooling water in the small circulation pipeline will enter the large circulation pipeline (low-temperature cooling water). By adjusting the opening of the three-way valve, the mixing ratio of cold and hot water in the large and small circulation pipelines can be controlled, so that the cooling water temperature in the large circulation pipeline gradually increases, preventing the low-temperature cooling water in the large circulation pipeline from producing a thermal shock effect.

[0040] When the actual temperature of the cooling water at the stack inlet reaches the target control temperature of the three-way valve, the three-way valve PID control is turned on (the three-way valve feedforward control still exists at this time), and the three-way valve PID control adjusts the three-way valve (2s-5s) and maintains it to the maximum opening value of 100%; at this time, the three-way valve is in an oversaturated setting state (the sum of the upper limit value of the three-way valve feedforward control output and the upper limit value of the three-way valve PID control output is 160%-180%, which exceeds the maximum opening value of the three-way valve of 100%). Even if the power of the subsequent fuel cell system changes (the actual temperature of the cooling water at the stack inlet is controlled by the radiator at this time), the opening value of the three-way valve is always maintained at 100%, ensuring that the opening value of the three-way valve is always at a fixed value, thereby reducing the subsequent coupling effect on the radiator.

[0041] When the three-way valve is adjusted to the maximum opening value, the radiator feedforward control is turned on and the speed of the radiator is controlled; at this time, since the three-way valve and the radiator jointly adjust the temperature of the cooling water, the actual temperature of the cooling water at the stack inlet will approach the radiator target control temperature in a shorter time. When the actual temperature of the cooling water at the stack inlet is consistent with the radiator target control temperature (the three-way valve is already in the maximum opening value state), the radiator PID control is turned on and the speed of the radiator is further controlled (at this time, the three-way valve remains at the maximum opening value, which is convenient for the radiator PID control to accurately adjust the actual temperature of the cooling water at the stack inlet), maintaining the actual temperature of the cooling water at the stack inlet consistent with the radiator target control temperature.

[0042] When the fuel cell system is in the variable power operation stage, the cooling system includes the following control steps: Based on the three-way valve feedforward control and three-way valve PID control, the three-way valve continuously maintains the maximum opening value; Based on radiator feedforward control and radiator PID control, the radiator maintains the actual temperature of the cooling water at the stack inlet consistent with the radiator target control temperature.

[0043] During the variable power operation stage of the entire fuel cell, the opening value of the three-way valve does not need to be changed and can always be kept at the maximum opening value to ensure that the cooling water flow through the three-way valve does not fluctuate. At this time, the only variable is the radiator speed (the coupling effect is greatly reduced). The radiator speed is adjusted through radiator feedforward control and radiator PID control to ensure that the actual temperature of the cooling water at the stack inlet is consistent with the radiator target control temperature.

[0044] When the fuel cell is in the low-temperature and low-power operation stage, the cooling system includes the following control steps: If the actual temperature of the cooling water at the stack inlet is between the radiator control target temperature and the three-way valve control target temperature, the radiator PID control is closed, the three-way valve maintains the maximum opening value, and the radiator feedforward control output is adjusted to the fan speed corresponding to the current stack power; because it is in a low temperature and low power state, the temperature required for the stack is not high at this time. At this time, the radiator feedforward control adjusts the radiator speed according to the stack power to ensure that the actual temperature of the cooling water at the stack inlet does not continue to drop.

[0045] If the actual temperature of the cooling water at the inlet of the stack is lower than the target temperature controlled by the three-way valve, it means that the power of the stack is too low, and there is no need for a radiator to cool the cooling water. In addition, there is too much cooling water in the current large cycle, and the heat generated by the stack is insufficient to maintain the cooling water temperature of the current large cycle. At this time, the radiator is stopped and the PID control output of the three-way valve is adjusted to the minimum opening value of the three-way valve 0 (that is, the PID control of the three-way valve is released to ensure that the opening value of the three-way valve can be reduced to below 100%), and the feedforward control output of the three-way valve is adjusted to the opening value corresponding to the target control temperature of the three-way valve. At this time, the actual temperature of the cooling water at the inlet of the stack is completely controlled by the three-way valve, without interference from the radiator, ensuring that the actual temperature of the cooling water at the inlet of the stack can be accurately maintained near the target control temperature of the three-way valve, and ensuring that the temperature inside the stack will not continue to drop.

[0046] like Figure 7 As shown, another embodiment of the present invention discloses a decoupling control system of a fuel cell cooling system, which is applied to the above-mentioned decoupling control method, including: The parameter module is used to obtain various operating parameters (opening value, speed value, temperature value and other data) in the fuel cell system, and calculate the judgment data through the obtained operating parameters; A judgment module, used to receive the judgment data from the parameter module, and identify the current operation state of the fuel cell system (shutdown stage, cold start stage, variable power operation stage and low temperature and low power operation stage) through the judgment data; The control module is used to receive the signal from the judgment module and adjust the parameters of each component (three-way valve and radiator) in the cooling system according to the signal of the judgment module, so that the actual temperature of the cooling water at the inlet of the fuel cell stack is consistent with the target control temperature of the radiator.

[0047] Each module in the above control system (parameter module, judgment module and control module) can be embedded in or independent of the processor of the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0048] like Figure 8 As shown, another embodiment of the present invention further provides a computer device, including: a memory and a processor; the memory is used to store at least one program; when the program is executed by the processor, the processor implements the control method in the above embodiment. Specifically, the computer device internally includes a bus and a processor, a memory and a network interface respectively connected to the bus. Among them, the processor is used to provide computing and control capabilities; the memory includes a storage medium (storing an operating system, a computer program and a database) and an internal memory (providing an environment for the operation of the operating system and the computer program); the network interface is used to connect and communicate with an external terminal.

[0049] Another embodiment of the present invention further provides a storage medium, including a computer program, and when the computer program is executed by a processor, the control method in the above embodiment is implemented.

[0050] Although the present invention is disclosed through the above embodiments, the protection scope of the present invention is not limited thereto. Without departing from the concept of the present invention, any deformation, replacement, etc. made to the above components shall fall within the scope of the claims of the present invention.

Claims

1. A decoupling control method for a fuel cell cooling system, characterized in that: The control steps include: Obtain the target temperature of the battery stack at different battery stack powers; Set the three-way valve target control temperature, radiator target control temperature and stack inlet cooling water target temperature according to the stack target temperature; Among them, the target control temperature of the three-way valve is lower than the target control temperature of the radiator; Get the actual temperature of the cooling water at the stack inlet; When the actual temperature of the cooling water at the inlet of the stack is lower than the target control temperature of the three-way valve, the three-way valve controls the change of the actual temperature of the cooling water at the inlet of the stack; When the actual temperature of the cooling water at the inlet of the stack is between the target control temperature of the three-way valve and the target control temperature of the radiator, the change of the actual temperature of the cooling water at the inlet of the stack is controlled by the three-way valve and the radiator together; When the actual temperature of the cooling water at the inlet of the fuel cell stack is maintained consistent with the target control temperature of the radiator, the change of the actual temperature of the cooling water at the inlet of the fuel cell stack is controlled by the radiator.

2. The decoupling control method of a fuel cell cooling system according to claim 1, characterized in that: The three-way valve target control temperature is achieved by controlling the opening of the three-way valve, and the three-way valve opening control includes three-way valve feedforward control and three-way valve PID control; The three-way valve feedforward control controls the opening of the three-way valve based on the actual temperature of the cooling water at the stack inlet; The three-way valve PID control controls the opening of the three-way valve based on the target temperature of the cooling water at the inlet of the stack, the target temperature difference △T and the actual temperature of the cooling water at the inlet of the stack; Among them, the target temperature difference △T is 2℃ to -5℃.

3. The decoupling control method of a fuel cell cooling system according to claim 2, characterized in that: The upper limit of the three-way valve feedforward control output is the maximum opening value of the three-way valve, and the lower limit of the output is the minimum opening value of the three-way valve; The upper limit of the three-way valve PID control output is the positive value of the three-way valve opening, and the lower limit of the output is the minimum opening value of the three-way valve; The sum of the three-way valve feedforward control output upper limit value and the three-way valve PID control output upper limit value is greater than the three-way valve maximum opening value; Among them, the maximum opening value is 100%, the minimum opening value is 0, and the positive opening value is 60% to 80%.

4. The decoupling control method of a fuel cell cooling system according to claim 3, characterized in that: The target control temperature of the radiator is achieved by controlling the speed of the radiator, and the speed control of the radiator includes feedforward control of the radiator and PID control of the radiator; The radiator feedforward control controls the radiator speed based on the stack power and ambient temperature; The radiator PID control controls the speed of the radiator based on the target temperature of the cooling water at the stack inlet and the actual temperature of the cooling water at the stack inlet.

5. The decoupling control method of a fuel cell cooling system according to claim 4, characterized in that: The upper limit value of the radiator feedforward control output is the positive value of the radiator speed, and the lower limit value of the output is the minimum value of the radiator speed; The upper limit of the radiator PID control output is the positive value of the radiator speed, and the lower limit of the output is the negative value of the radiator speed; The sum of the radiator feedforward control and the radiator PID control output can reach the maximum radiator speed; Among them, the positive value of the speed is 40% to 60%, the negative value of the speed is -20% to -10%, the minimum value of the speed is 0, and the maximum value of the speed is 100%.

6. The decoupling control method of a fuel cell cooling system according to claim 5, characterized in that: When the fuel cell system is in the shutdown stage, the cooling system includes the following control steps: The water pump is in the off state, the radiator is in the off state, the three-way valve is in the state where the large circulation is fully closed and the small circulation is fully open.

7. The decoupling control method of a fuel cell cooling system according to claim 6, characterized in that: When the fuel cell system is in the cold start stage, the cooling system includes the following control steps: Turn on the water pump, the radiator is in the closed state, the three-way valve is in the state of large circulation fully closed and small circulation fully open, and the cooling water temperature rises; Set the three-way valve opening temperature T1; When the actual temperature of the cooling water at the stack inlet reaches the three-way valve opening temperature T1, the three-way valve feedforward control is turned on and the opening value of the three-way valve is controlled; When the actual temperature of the cooling water at the stack inlet reaches the target control temperature of the three-way valve, the three-way valve PID control is turned on, and the three-way valve PID control adjusts and maintains the three-way valve to the maximum opening value; When the three-way valve is adjusted to the maximum opening value, the radiator feedforward control is turned on and the speed of the radiator is controlled; When the actual temperature of the cooling water at the inlet of the fuel cell stack reaches the target control temperature of the radiator, the radiator PID control is turned on and the speed of the radiator is controlled to maintain the actual temperature of the cooling water at the inlet of the fuel cell stack consistent with the target control temperature of the radiator.

8. The decoupling control method of a fuel cell cooling system according to claim 7, characterized in that: When the fuel cell system is in the variable power operation stage, the cooling system includes the following control steps: Based on the three-way valve feedforward control and three-way valve PID control, the three-way valve continuously maintains the maximum opening value; Based on radiator feedforward control and radiator PID control, the radiator maintains the actual temperature of the cooling water at the stack inlet consistent with the radiator target control temperature.

9. The decoupling control method of a fuel cell cooling system according to claim 8, characterized in that: When the fuel cell is in the low-temperature and low-power operation stage, the cooling system includes the following control steps: If the actual temperature of the cooling water at the stack inlet is between the radiator control target temperature and the three-way valve control target temperature, the radiator PID control is turned off, the three-way valve maintains the maximum opening value, and the radiator feedforward control output is adjusted to the fan speed corresponding to the current stack power; If the actual temperature of the cooling water at the stack inlet is lower than the target temperature controlled by the three-way valve, stop the radiator and adjust the PID control output of the three-way valve to the minimum opening value of the three-way valve, and adjust the feedforward control output of the three-way valve to the opening value corresponding to the target control temperature of the three-way valve.

10. A decoupling control system for a fuel cell cooling system, applied to the decoupling control method according to any one of claims 1 to 9, characterized in that: include: A parameter module is used to obtain various operating parameters in the fuel cell system and calculate the judgment data through the obtained operating parameters; A judgment module, used to receive the judgment data from the parameter module and identify the current operating state of the fuel cell system through the judgment data; The control module is used to receive the signal from the judgment module and adjust the parameters of each component in the cooling system according to the signal of the judgment module so that the actual temperature of the cooling water at the inlet of the battery stack is consistent with the target control temperature of the radiator.

11. A computer device, characterized in that: include: Memory and processor; The memory is used to store at least one program; When the program is executed by a processor, the processor implements the control method as described in any one of claims 1-9.

12. A storage medium comprising a computer program, characterized in that: When the computer program is executed by a processor, the control method according to any one of claims 1 to 9 is implemented.

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