Starting control method for fuel cell system, apparatus and electronic device

Abstract

Provided in the present application are a starting control method for a fuel cell system, an apparatus, an electronic device and a medium. A fuel cell system is used in a fuel cell vehicle, the fuel cell system being provided with a fuel cell stack and a power battery, which are connected to each other by means of a direct-current converter. When the voltage difference value between the input voltage and the output voltage of the direct-current converter does not satisfy the working characteristics thereof, the direct-current converter is controlled to achieve directly-coupled connection of the fuel cell stack and a whole vehicle load end and / or the power battery. Thus, the fuel cell stack directly uses the voltage as power supply for the vehicle load, so that the output voltage of the fuel cell stack is reduced, and the vehicle is not started until the voltage difference value between the output voltage of the fuel cell stack and the voltage of the power battery satisfies the working characteristic conditions of the direct-current converter. The method can solve the problem of voltage matching between the fuel cell stack and the power battery without reducing the output voltage of the fuel cell stack, thereby simplifying a related booster circuit at the output side of the power battery and reducing the manufacturing cost of vehicles.

Description

Fuel cell system startup control method, device, and electronic equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311002656.2 and application date of August 9, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of startup control of a fuel cell system, and in particular to a startup control method, device, and electronic equipment for a fuel cell system. Background Art

[0004] The fuel cell system is the core power equipment of fuel cell vehicles. It generates electricity through the fuel cell stack built into the fuel cell system and transmits the electricity to the power battery for driving the vehicle. It can be seen that the performance of the fuel cell stack directly determines the core performance of the vehicle such as endurance and power performance. Therefore, the fuel cell stacks in existing fuel cell vehicles are generally designed with high power capacity. The high power capacity fuel cell stack will inevitably make the voltage of the fuel cell stack higher. Therefore, voltage matching is required during the power transmission process to the power battery.

[0005] Since the voltage generated by the fuel cell stack during the power generation process is a dynamic voltage and the voltage value is not fixed, it needs to be converted into a constant voltage through a DC converter (Direct Current for Fuel, referred to as DCF) and used in the charging process of the power battery. Since the DC converter is usually a boost topology, its operation requires the input voltage to be lower than the output voltage, that is, the fuel cell stack voltage needs to be lower than the power battery voltage. Under the premise that the required voltage of the power battery is relatively stable, the voltage of the fuel cell stack can only be reduced, which will lead to reduced performance of the fuel cell vehicle.

[0006] In related technologies, the voltage matching issue can be solved by increasing the voltage on one side of the power battery. For example, a bidirectional DCDC (Direct Current-Direct Current) boost circuit is added to the output side of the power battery to increase the voltage on the power battery side. This DCDC is a specific implementation of a DC converter (DCF).

[0007] However, the newly added boost circuit not only takes up space in the vehicle, but also increases the vehicle manufacturing cost. Therefore, existing fuel cell vehicles still have the problem of voltage matching between the fuel cell stack and the power battery when the fuel cell system is started, which needs to be solved urgently.

[0008] Summary of the Invention

[0009] The present application provides a startup control method, device, and electronic device for a fuel cell system. The method can solve the voltage matching problem between the fuel cell stack and the power battery without reducing the output voltage of the fuel cell stack, simplify the related boost circuit on the output side of the power battery, and reduce the vehicle manufacturing cost.

[0010] In a first aspect, an embodiment of the present application provides a startup control method for a fuel cell system, wherein the fuel cell system is applied to a fuel cell vehicle; the fuel cell system is provided with a fuel cell stack and a power battery, wherein the fuel cell stack and the power battery are connected via a DC converter; the method comprises:

[0011] When a start-up command of the fuel cell system is received, determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a first threshold condition; wherein, in the first threshold condition, Uin+ΔU>Uout, wherein Uin is the output voltage value of the fuel cell stack, Uout is the voltage value of the power battery, and ΔU is the gain voltage of the DC converter;

[0012] If the first threshold condition is met, the DC converter is controlled to directly couple the fuel cell stack to the load terminal of the vehicle and / or the power battery, and it is determined whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout;

[0013] If the second threshold condition is met, the fuel cell system is controlled to complete startup.

[0014] Through the above technical solution, the voltage matching problem between the fuel cell stack and the power battery can be solved without reducing the output voltage of the fuel cell stack. At the same time, the related boost circuit on the output side of the power battery can be simplified, reducing the vehicle manufacturing cost.

[0015] In combination with the first aspect, in some possible implementations, the gain voltage of the DC converter is obtained by a preset relationship between an input voltage of the DC converter and an output voltage of the DC converter.

[0016] Through the above technical solution, the gain voltage of the DC converter can be calibrated according to the working characteristics of the DC converter, and the gain voltage can be used to determine whether the voltage difference between the fuel cell stack and the power battery needs to be adjusted.

[0017] In conjunction with the first aspect, in some possible implementations, determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition includes:

[0018] Controlling the input relay in the DC converter to be in a closed state;

[0019] determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a third threshold condition; wherein, in the third threshold condition, the output voltage value of the fuel cell stack is equal to the voltage value of the power battery;

[0020] If the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition, the energy-consuming components in the fuel cell vehicle are controlled to start working and determine whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein, the energy-consuming components are connected to the fuel cell stack.

[0021] Through the above technical solution, it is possible to judge whether the output voltage value of the fuel cell stack meets the working conditions of the DC converter through the second threshold condition; and to judge the coupling connection situation through the third threshold condition.

[0022] In conjunction with the first aspect, in some possible implementations, after determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition, the method further includes:

[0023] If the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the third threshold condition, the working state of the DC converter is updated and controlled, and the output voltage value of the fuel cell stack and the voltage value of the power battery are reacquired.

[0024] Through the above technical solution, when the third threshold condition is not satisfied, the working state of the DC converter can be adjusted, and the output voltage value of the fuel cell stack and the voltage value of the power battery can be re-obtained.

[0025] In conjunction with the first aspect, in certain possible implementations, after controlling the energy-consuming components in the fuel cell vehicle to start operating and determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition, the method further includes:

[0026] If the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the second threshold condition, the working state of the energy-consuming component is updated and controlled, and the output voltage value of the fuel cell stack and the voltage value of the power battery are re-acquired.

[0027] Through the above technical solution, when the second threshold condition is not met, the working state of the energy-consuming component can be adjusted, and the output voltage value of the fuel cell stack and the voltage value of the power battery can be re-obtained for cyclic judgment.

[0028] In conjunction with the first aspect, in some possible implementations, controlling the energy-consuming components in the fuel cell vehicle to start operating includes:

[0029] The heating module included in the energy-consuming component is controlled to enter a heating mode, and the output voltage value of the fuel cell stack is detected in real time.

[0030] Through the above technical solution, the fuel cell stack can be controlled so that the heating modules enter the heating mode, thereby reducing the output voltage value of the fuel cell stack.

[0031] In combination with the first aspect, in some possible implementations, when judging whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition, if the output voltage value of the fuel cell stack or the voltage value of the power battery exceeds the preset threshold range, the fuel cell system is controlled to enter a protection mode.

[0032] Through the above technical solution, the fuel cell system is controlled to enter the protection mode, which can promptly eliminate the abnormal state of the fuel cell stack or power battery.

[0033] In conjunction with the first aspect, in some possible implementations, after determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition, the method further includes:

[0034] If the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the first threshold condition, the fuel cell system is controlled to complete startup.

[0035] With the above technical solution, when the voltage difference between the fuel cell stack and the power battery does not meet the first threshold condition, indicating that the DC converter can work normally, the fuel cell system can be controlled to start normally.

[0036] A second embodiment of the present application provides a startup control device for a fuel cell system, wherein the fuel cell system is applied to a fuel cell vehicle, and the fuel cell system is provided with a fuel cell stack and a power battery, wherein the fuel cell stack and the power battery are connected via a DC converter; the device comprises:

[0037] a first judgment module, configured to, upon receiving a start-up command for the fuel cell system, judge whether an output voltage value of the fuel cell stack and a voltage value of the power battery meet a first threshold condition; wherein, in the first threshold condition, Uin+ΔU>Uout, where Uin is the output voltage value of the fuel cell stack, Uout is the voltage value of the power battery, and ΔU is a gain voltage of a DC converter;

[0038] a second judgment module, configured to control the DC converter to directly couple the fuel cell stack to a load terminal of the vehicle and / or the power battery when the first threshold condition is met, and to judge whether the output voltage of the fuel cell stack and the voltage of the power battery meet a second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout;

[0039] The first control module is configured to control the fuel cell system to start up when the second threshold condition is met.

[0040] Optionally, the gain voltage of the DC converter is obtained by a preset relationship between the input voltage of the DC converter and the output voltage of the DC converter.

[0041] Optionally, the second judgment module includes:

[0042] a first control unit, configured to control an input relay in the DC converter to be in a closed state;

[0043] a first judgment unit, configured to judge whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a third threshold condition; wherein, in the third threshold condition, the output voltage value of the fuel cell stack is equal to the voltage value of the power battery;

[0044] The second judgment unit is used to control the energy-consuming components in the fuel cell vehicle to start working and judge whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition when the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition; wherein the energy-consuming components are connected to the fuel cell stack.

[0045] Optionally, the second judgment module further includes:

[0046] The second control unit is used to update and control the working state of the DC converter and re-acquire the output voltage value of the fuel cell stack and the voltage value of the power battery when the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the third threshold condition.

[0047] Optionally, the second judgment module further includes:

[0048] The third control unit is used to update and control the working state of the energy-consuming component and re-acquire the output voltage value of the fuel cell stack and the voltage value of the power battery when the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the second threshold condition.

[0049] Optionally, the second judgment module is specifically configured to:

[0050] The heating module included in the energy-consuming component is controlled to enter a heating mode, and the output voltage value of the fuel cell stack is detected in real time.

[0051] Optionally, the first judgment module includes:

[0052] A fourth control unit is used to determine whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a first threshold condition. If the output voltage value of the fuel cell stack or the voltage value of the power battery exceeds a preset threshold range, the fuel cell system is controlled to enter a protection mode.

[0053] Optionally, the startup control device of the fuel cell system further includes:

[0054] The second control module is configured to control the fuel cell system to start up when the first threshold condition is not met.

[0055] In a third aspect, an electronic device is provided, comprising: a memory, a processor, and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to implement the method as described in the above embodiments, including: a memory, a processor, and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to implement the method in the first aspect or any possible implementation manner of the first aspect.

[0056] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0058] FIG1 is a flow chart of a startup control method for a fuel cell system provided in an embodiment of the present application;

[0059] FIG2 is a flow chart of determining whether the voltage of a fuel cell stack and the voltage of a power battery meet a second threshold condition according to an embodiment of the present application;

[0060] FIG3 is a flowchart of another method for starting and controlling a fuel cell system according to an embodiment of the present application;

[0061] FIG4 is a block diagram of a startup control device for a fuel cell system according to an embodiment of the present application;

[0062] FIG5 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

[0063] Among them, 10 is a start-up control device of the fuel cell system, 100 is a first judgment module, 200 is a second judgment module, 300 is a first control module, 501 is a memory, 502 is a processor, and 503 is a communication interface. DETAILED DESCRIPTION

[0064] The following will clearly and thoroughly describe the technical solutions in this application in conjunction with the accompanying drawings. In the description of the embodiments of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B: "and / or" in the text is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more than two.

[0065] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to imply or suggest relative importance or implicitly indicate the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0066] There is often a voltage matching problem in the process of matching fuel cells with vehicle power batteries. Based on the vehicle's endurance, power and other indicators, the fuel cell stack needs to be designed with a large power capacity, so that the stack voltage will be higher than the vehicle bus voltage (i.e., the power battery voltage). At present, the DC converter products of the fuel cell system only have a boost function, and their working characteristics require that the input voltage (i.e., the stack voltage) must be lower than a certain output voltage threshold (i.e., the power battery voltage). Therefore, it is necessary to control the stack voltage to achieve the working characteristics of the DC converter and thus meet the voltage startup requirements of the fuel cell system.

[0067] The traditional solution is generally to add a bidirectional DCDC boost to regulate the bus voltage on the output side of the power battery; reduce the number of cells in the stack to lower the stack voltage.

[0068] However, adding a bidirectional DCDC on the output side of the power battery requires high power, high cost, and large size, making vehicle layout difficult; and reducing the number of battery stacks will result in a reduction in fuel cell power, which cannot meet system specifications.

[0069] It is precisely based on the above problems that the embodiments of the present application propose a startup control method, device, electronic device and medium for a fuel cell system. This method can solve the voltage matching problem between the fuel cell stack and the power battery without reducing the voltage of the fuel cell stack. At the same time, it can simplify the related boost circuit on the output side of the power battery and reduce the vehicle manufacturing cost.

[0070] To facilitate understanding by those skilled in the art, the startup control method of the fuel cell system proposed in an embodiment of the present application is first introduced in detail, wherein the fuel cell system is applied to a fuel cell vehicle, and the fuel cell system is provided with a fuel cell stack and a power battery, and the fuel cell stack and the power battery are connected through a DC converter.

[0071] Specifically, FIG1 is a flowchart of a startup control method of a fuel cell system provided in an embodiment of the present application.

[0072] Exemplarily, as shown in FIG1 , the method includes the following steps:

[0073] In step S101, when a start-up command of the fuel cell system is received, it is determined whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a first threshold condition; wherein, in the first threshold condition, Uin+ΔU>Uout, wherein Uin is the output voltage value of the fuel cell stack, Uout is the voltage value of the power battery, and ΔU is the gain voltage of the DC converter.

[0074] In some embodiments, the gain voltage of the DC converter is obtained by a preset relationship between the input voltage of the DC converter and the output voltage of the DC converter.

[0075] It should be noted that the gain voltage ΔU of the DC converter can be calibrated according to the operating characteristics of the DC converter DCF, and the value can be positive or negative, that is, the preset relationship between the input voltage of the DC converter and the output voltage of the DC converter can be pre-set by relevant researchers, or obtained through a limited number of experiments, or obtained through a limited number of computer simulations, and no specific limitation is made here.

[0076] When the vehicle requires the fuel system to intervene in power generation, a start command is sent to the fuel cell system, which then calls upon the fuel cell stack to generate electricity. Upon receiving the start command, the system first obtains the power battery voltage from the power battery voltage acquisition interface and the fuel cell stack output voltage from the fuel cell stack voltage acquisition interface. Combined with the DCF operating characteristic voltage, the system then uses the first threshold condition to perform a logical judgment on these three voltage values.

[0077] Specifically, the DCF converts the variable output voltage of the fuel cell stack into a constant voltage. It uses its built-in power switching devices to chop the DC power into a square wave and adjust the duty cycle of the square wave to change the voltage. In the process of changing the voltage, the DCF is a boost topology, and its operating characteristics require that the input voltage be less than the output voltage. This means that the DCF itself requires a portion of its voltage to regulate and control the relevant voltage and current loops. Therefore, when the voltage difference between the two meets the first threshold condition, it indicates that the output voltage of the fuel cell stack is too high, making it difficult to ensure the DCF can function properly.

[0078] In step S102, if the first threshold condition is met, the DC converter is controlled to directly couple the fuel cell stack with the load end and / or the power battery of the vehicle, and it is determined whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout.

[0079] Specifically, when the output voltage of the fuel cell stack and the voltage of the power battery meet the first threshold condition, indicating that the voltage of the fuel cell stack is high, the DCF is controlled to enter the disabled Bypass mode, so that the fuel cell stack is connected to the load end and / or power battery of the vehicle. The output voltage of the fuel cell stack is directly coupled into the power battery. When the fuel cell stack is connected to the load end, the load energy-consuming components of the vehicle consume the power of the fuel cell stack, thereby causing the voltage of the fuel cell stack to drop. In this process, the heating function of the relevant energy-consuming components can be used to heat the fuel cell stack, which is beneficial for cold starting and heat preservation of the fuel cell system in cold usage scenarios.

[0080] Furthermore, after the fuel cell stack is connected to the load end of the power battery and / or the entire vehicle, the voltage value of the fuel cell stack continues to decrease. At this time, the output voltage value of the fuel cell stack and the voltage value of the power battery are obtained in real time, and the second threshold condition is used to determine whether they meet the working conditions of the DC converter.

[0081] In step S103 , if the second threshold condition is met, the fuel cell system is controlled to complete startup.

[0082] It can be understood that when the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition, the output voltage value of the fuel cell stack has dropped to a voltage value sufficient to ensure the normal operation of the DC converter. At this time, the DCF can be controlled to enter the Standby mode of the ready state, and the fuel cell stack in the fuel cell system can be controlled to generate electricity. At the same time, the DCF can be controlled to enter the normal working state to complete the conversion of the dynamic voltage generated by the fuel cell stack into a constant voltage, thereby completing the startup process of the fuel cell system.

[0083] It should be noted that the fuel cell system includes various relays, such as output relays, input relays, etc., through which the fuel cell stack can be connected to the power battery and / or the load end of the vehicle.

[0084] In one possible implementation, determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition, as shown in FIG2 , includes the following steps:

[0085] Step S201: Control the input relay in the DC converter to be in a closed state.

[0086] Specifically, in the process of controlling the input relay, it can be achieved through relevant closing instructions. When the DCF receives the closing instruction, the input relay in the DCF is in a closed state, and the DCF enters the Bypass mode.

[0087] Step S202 , determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a third threshold condition, wherein in the third threshold condition, the output voltage value of the fuel cell stack is equal to the voltage value of the power battery.

[0088] It is understood that after the DCF enters Bypass mode, it can be used to detect the output voltage of the fuel cell stack and the voltage of the power battery in real time, and determine whether the output voltage Uin of the fuel cell stack is equal to the voltage Uout of the power battery. Generally speaking, after the DCF enters Bypass mode, the fuel cell stack is connected to the power battery and / or the load end of the vehicle, and the output voltage Uin of the fuel cell stack will be equal to the voltage Uout of the power battery. However, other anomalies may occur during the coupling process, so the third threshold condition is required to further determine the coupling connection status.

[0089] Step S203: If the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition, the energy-consuming components in the fuel cell vehicle are controlled to start working and determine whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein the energy-consuming components are connected to the fuel cell stack.

[0090] Specifically, when the output voltage of the fuel cell stack and the voltage of the power battery meet the third threshold condition, that is, the output voltage of the fuel cell stack is equal to the voltage of the power battery, the DCF can be controlled to exit Bypass mode and the vehicle's load energy-consuming components can be controlled to operate. Because the energy-consuming components are connected to the fuel cell stack, the vehicle's load energy-consuming components consume power from the fuel cell stack, causing the output voltage of the fuel cell stack to drop. During the process of the fuel cell stack's output voltage dropping, it is necessary to obtain the output voltage of the fuel cell stack and the voltage of the power battery in real time and determine whether they meet the DCF operating conditions based on the second threshold condition. To avoid redundancy, this is not further described here.

[0091] Optionally, in some embodiments, controlling the energy-consuming components in the fuel cell vehicle to start working includes: controlling a heating module included in the energy-consuming components to enter a heating mode, and detecting the output voltage value of the fuel cell stack in real time.

[0092] It is understandable that fuel cell vehicles are generally equipped with devices to keep the fuel cell system warm. In cold environments, the fuel cell stack and power battery of the fuel cell system can be heated by the heat preservation device, thereby achieving the heat preservation function of the fuel cell system. Specifically, the heating module contained in the energy-consuming components is controlled to enter the heating mode, and the output voltage of the fuel cell stack is detected in real time. Such energy-consuming components contain corresponding heat preservation devices, which are equipped with heating modules. By controlling the fuel cell stack, these heating modules enter the heating mode, thereby reducing the output voltage of the fuel cell stack.

[0093] Optionally, in other embodiments, after determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition, it also includes: if the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the third threshold condition, then updating and controlling the working state of the DC converter, and re-obtaining the output voltage value of the fuel cell stack and the voltage value of the power battery.

[0094] It is not difficult to understand that since the third threshold condition is used to judge the coupling connection between the fuel cell stack and the power battery and / or the load end of the whole vehicle, there will be a situation in the actual scenario where the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the third threshold condition. When the third threshold condition is not met, the working status of the DCF can be updated and controlled to re-obtain the output voltage value of the fuel cell stack and the voltage value of the power battery.

[0095] Optionally, in some embodiments, after controlling the energy-consuming components in the fuel cell vehicle to start working and determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition, it also includes: if the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the second threshold condition, then updating and controlling the working state of the energy-consuming components, and re-obtaining the output voltage value of the fuel cell stack and the voltage value of the power battery.

[0096] That is to say, the second threshold condition is used to determine whether the continuously decreasing output voltage value of the fuel cell stack meets the DCF working conditions. When the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the second threshold condition, the working state of the energy-consuming components can be updated and controlled, and the output voltage value of the fuel cell stack and the voltage value of the power battery can be re-obtained, and the judgment is repeated until the second threshold condition is met.

[0097] In addition, in some embodiments, when determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a first threshold condition, if the output voltage value of the fuel cell stack or the voltage value of the power battery exceeds a preset threshold range, the fuel cell system is controlled to enter a protection mode.

[0098] It is understandable that after receiving the start-up command of the fuel cell system, the output voltage value of the fuel cell stack and the voltage value of the power battery are first obtained. However, these two components cannot guarantee that the fuel cell system is in normal working condition. The output voltage value of the fuel cell stack and the voltage value of the power battery can be used to determine whether it is in normal working condition respectively. Therefore, it is necessary to determine the working status of these two components separately to rule out the situation where they are in abnormal state. If it is determined that the output voltage value of the fuel cell stack or the voltage value of the power battery exceeds the preset threshold range, the fuel cell system can be controlled to enter the protection mode. At this time, the DCF also enters the protection mode. The fuel cell system can report the abnormal voltage value of the power battery stack through the DCF. At the same time, the DCF can also be used to continue to identify the output voltage value of the fuel cell stack and the voltage value of the power battery, and detect in real time whether these components are in normal state.

[0099] Optionally, in other embodiments, after determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition, it also includes: if the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the first threshold condition, controlling the fuel cell system to complete startup.

[0100] Since the first threshold condition indicates that the voltage difference between the fuel cell system and the power battery needs to be adjusted, that is, when the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition, it indicates that the output voltage of the fuel cell stack is high, and it is difficult to ensure that the DCF can work normally. When the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the first threshold condition, it indicates that the DC converter DCF can work normally. Therefore, when the first threshold condition is not met, the fuel cell vehicle can be controlled to complete the startup.

[0101] To facilitate those skilled in the art to further understand the startup control method of the fuel cell system mentioned in the above embodiment, further description will be given below with reference to FIG. 3 .

[0102] As shown in FIG3 , FIG3 is an application example of another fuel cell system startup control method provided in an embodiment of the present application, the method comprising the following steps:

[0103] Step S301: establishing the power battery voltage.

[0104] When the fuel cell system starts, the system prepares to start. Since the power battery voltage is a fixed value, the power battery voltage can be initialized at this time. In actual scenarios, the power battery voltage can also be established by initializing the bus voltage of the fuel cell vehicle.

[0105] In step S302 , the DCF detects the power battery voltage and the fuel cell stack output voltage.

[0106] At this time, the DCF mainly detects whether the power battery voltage and the fuel cell stack output voltage exist, and this step can also be considered as an initialization step.

[0107] In step S303 , the DCF identifies the power battery voltage value and the fuel cell stack output voltage value.

[0108] In this step, DCF is used to obtain the actual voltage values ​​of the power battery and fuel cell stack, which can be achieved by calling its voltage acquisition port, and the details will not be repeated here.

[0109] Step S304 , determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a first threshold condition.

[0110] The first threshold condition satisfies Uin+ΔU>Uout, where Uin is the output voltage value of the fuel cell stack; Uout is the voltage value of the power battery; and ΔU is the gain voltage of the DC converter.

[0111] If yes, it indicates that the DC converter DCF can work normally, and step S305a is executed; if no, it indicates that the voltage of the fuel cell system is high, and step S306a is executed; if the output voltage value of the fuel cell stack or the voltage value of the power battery is in an abnormal state, step S307 is executed.

[0112] Step S305a: DCF enters Standby mode.

[0113] Step S305b: the fuel cell vehicle issues a fuel cell system startup command;

[0114] Step S305c: DCF operates normally.

[0115] Step S306a: Close the DCF input relay.

[0116] Step S306b: DCF enters the Bypass mode.

[0117] In step S306c, the DCF detects the voltage of the power battery and the output voltage of the fuel cell stack.

[0118] Step S306d: determine whether the voltage value of the power battery is equal to the output voltage value of the fuel cell stack.

[0119] If yes, execute step S306e; if no, execute step S306b.

[0120] Step S306e: exit the Bypass mode and turn on PTC.

[0121] In step S306f, the DCF detects the voltage of the power battery and the output voltage of the fuel cell stack.

[0122] Step S306g: determine whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition.

[0123] The second threshold condition must satisfy Uin + ΔU ≤ Uout, where Uin is the output voltage of the fuel cell stack; Uout is the voltage of the power battery; and ΔU is the gain voltage of the DC converter. If so, proceed to step S305a; if not, proceed to step S306e.

[0124] Step S307a: DCF enters protection mode.

[0125] In step S307b, the fuel cell system performs detection processing.

[0126] Step S307c: DCF reports the output voltage value of the fuel cell stack.

[0127] The abnormal voltage value of the power battery stack is reported via the DC converter DCF, and step S302 is executed after the reporting is completed.

[0128] In summary, the startup control method of the fuel cell system proposed in the present application, when receiving the startup command of the fuel cell system, determines whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition; wherein, in the first threshold condition, Uin+ΔU>Uout, wherein, Uin is the output voltage value of the fuel cell stack, Uout is the voltage value of the power battery, and ΔU is the gain voltage of the DC converter; if the first threshold condition is met, the DC converter is controlled to directly couple the fuel cell stack with the load end and / or the power battery of the whole vehicle, and determines whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout; if the second threshold condition is met, the fuel cell system is controlled to complete the startup. As can be seen, during the fuel cell system startup process, when the difference between the DC converter's input voltage and output voltage does not meet its operating characteristics, the DC converter is controlled to directly couple the fuel cell stack to the vehicle's load terminal and / or power battery. At this time, the fuel cell stack directly uses its voltage to power the vehicle load, causing the fuel cell stack output voltage to drop. The vehicle is only started after the voltage difference between the fuel cell stack output voltage and the power battery voltage meets the DC converter's operating characteristics. This method solves the voltage matching problem between the fuel cell stack and the power battery without reducing the fuel cell stack's output voltage. It also simplifies the related boost circuitry on the power battery output side, reducing vehicle manufacturing costs.

[0129] FIG4 is a block diagram of a startup control device for a fuel cell system provided in an embodiment of the present application.

[0130] A fuel cell system is used in a fuel cell vehicle. The fuel cell system comprises a fuel cell stack and a power battery, which are connected to the power battery via a DC converter. As shown in FIG4 , the startup control device 10 of the fuel cell system includes a first judgment module 100 , a second judgment module 200 , and a first control module 300 .

[0131] The first judgment module 100 is configured to determine whether the output voltage of the fuel cell stack and the voltage of the power battery meet a first threshold condition when receiving a start-up command for the fuel cell system; wherein, in the first threshold condition, Uin+ΔU>Uout, where Uin is the output voltage of the fuel cell stack, Uout is the voltage of the power battery, and ΔU is the gain voltage of the DC converter;

[0132] The second judgment module 200 is used to control the DC converter to directly couple the fuel cell stack with the load terminal and / or the power battery of the vehicle when the first threshold condition is met, and to judge whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout;

[0133] The first control module 300 is configured to control the fuel cell system to start up when a second threshold condition is met.

[0134] Optionally, in some embodiments, the gain voltage of the DC converter is obtained by a preset relationship between the input voltage of the DC converter and the output voltage of the DC converter.

[0135] Optionally, in some embodiments, the second determination module 200 includes:

[0136] A first control unit, configured to control an input relay in the DC converter to be in a closed state;

[0137] a first judgment unit, configured to judge whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a third threshold condition; wherein, in the third threshold condition, the output voltage value of the fuel cell stack is equal to the voltage value of the power battery;

[0138] The second judgment unit is used to control the energy-consuming components in the fuel cell vehicle to start working and judge whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition when the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition; wherein the energy-consuming components are connected to the fuel cell stack.

[0139] Optionally, in some embodiments, the second determining module 200 further includes:

[0140] The second control unit is used to update and control the working state of the DC converter and re-acquire the output voltage value of the fuel cell stack and the voltage value of the power battery when the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the third threshold condition.

[0141] Optionally, in some embodiments, the second determining module 200 further includes:

[0142] The third control unit is used to update and control the working state of the energy-consuming component and re-acquire the output voltage value of the fuel cell stack and the voltage value of the power battery when the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the second threshold condition.

[0143] Optionally, in some embodiments, the second determination module 200 is specifically configured to:

[0144] The heating module included in the energy-consuming component is controlled to enter a heating mode, and the output voltage value of the fuel cell stack is detected in real time.

[0145] Optionally, in some embodiments, the first judgment module includes:

[0146] The fourth control unit is used to determine whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition. If the output voltage value of the fuel cell stack or the voltage value of the power battery exceeds the preset threshold range, the fuel cell system is controlled to enter the protection mode.

[0147] Optionally, in some embodiments, the startup control device 10 of the fuel cell system further includes:

[0148] The second control module is configured to control the fuel cell system to complete startup when the first threshold condition is not met.

[0149] The device provided in the embodiment of the present application has the same implementation principle and technical effects as those in the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference can be made to the corresponding content in the aforementioned method embodiment.

[0150] In summary, the startup control device of the fuel cell system proposed in the present application, when receiving the startup command of the fuel cell system, determines whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition; wherein, in the first threshold condition, Uin+ΔU>Uout, wherein, Uin is the output voltage value of the fuel cell stack, Uout is the voltage value of the power battery, and ΔU is the gain voltage of the DC converter; if the first threshold condition is met, the DC converter is controlled to directly couple the fuel cell stack with the load end and / or the power battery of the whole vehicle, and determines whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout; if the second threshold condition is met, the fuel cell system is controlled to complete the startup. As can be seen, during the fuel cell system startup process, when the difference between the DC converter's input voltage and output voltage does not meet its operating characteristics, the DC converter is controlled to directly couple the fuel cell stack to the vehicle's load terminal and / or power battery. At this time, the fuel cell stack directly uses its voltage to power the vehicle load, causing the fuel cell stack output voltage to drop. The vehicle is only started after the voltage difference between the fuel cell stack output voltage and the power battery voltage meets the DC converter's operating characteristics. This method solves the voltage matching problem between the fuel cell stack and the power battery without reducing the fuel cell stack's output voltage. It also simplifies the related boost circuitry on the power battery output side, reducing vehicle manufacturing costs.

[0151] FIG5 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.

[0152] It should be understood that the method described above can be applied to the electronic device with the structure shown in FIG. 5 .

[0153] In addition, an embodiment of the present application also protects a device, which may include a memory 501 and a processor 502, wherein the memory 501 stores executable program code, and the processor 502 is used to call and execute the executable program code to execute the startup control method of the fuel cell system provided in the embodiment of the present application.

[0154] Furthermore, the electronic device further includes: a communication interface 503 for communication between the memory 501 and the processor 502 .

[0155] It should be understood that the device provided in this embodiment is used to execute the above-mentioned startup control method of a fuel cell system, and thus can achieve the same effect as the above-mentioned implementation method.

[0156] In the case of an integrated unit, the device may include a processing module and a storage module. When the device is used in a car, the processing module can be used to control and manage the car's movements, and the storage module can be used to support the car in executing mutual program codes.

[0157] The processing module may be a processor 502 or a controller, which may implement or execute various exemplary logic blocks, modules, and circuits disclosed herein. The processor 502 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processing (DSP) and a microprocessor, and the like. The storage module may be a memory 501.

[0158] In addition, the device provided in the embodiments of the present application can specifically be a chip, component or module, and the chip may include a connected processor 502 and a memory 501; wherein the memory 501 is used to store instructions, and when the processor calls and executes the instructions, the chip can execute the startup control method of the fuel cell system provided in the above embodiment.

[0159] This embodiment also provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a startup control method for a fuel cell system provided in the above embodiment.

[0160] Among them, the device, computer-readable storage medium or chip provided in this embodiment is used to execute the corresponding method provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding method provided above, and will not be repeated here.

[0161] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0162] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0163] The above content is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A startup control method for a fuel cell system, characterized in that: The fuel cell system is applied to a fuel cell vehicle; the fuel cell system is provided with a fuel cell stack and a power battery, and the fuel cell stack and the power battery are connected via a DC converter; the method comprises: When receiving a start command of the fuel cell system, determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a first threshold condition; wherein, in the first threshold condition, Uin+ΔU>Uout, wherein Uin is the output voltage value of the fuel cell stack, Uout is the voltage value of the power battery, and ΔU is the gain voltage of the DC converter; If the first threshold condition is met, the DC converter is controlled to directly couple the fuel cell stack with the load end of the vehicle and / or the power battery, and it is determined whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout; If the second threshold condition is met, the fuel cell system is controlled to complete startup.

2. The startup control method of the fuel cell system according to claim 1, characterized in that: The gain voltage of the DC converter is obtained by a preset relationship between the input voltage of the DC converter and the output voltage of the DC converter.

3. The startup control method of the fuel cell system according to claim 1, characterized in that: The determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition includes: Controlling the input relay in the DC converter to be in a closed state; Determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a third threshold condition; wherein, in the third threshold condition, the output voltage value of the fuel cell stack is equal to the voltage value of the power battery; If the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition, the energy-consuming components in the fuel cell vehicle are controlled to start working and determine whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the second threshold condition; wherein the energy-consuming components are connected to the fuel cell stack.

4. The startup control method of the fuel cell system according to claim 3, characterized in that: After determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the third threshold condition, the method further includes: If the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the third threshold condition, the working state of the DC converter is updated and controlled, and the output voltage value of the fuel cell stack and the voltage value of the power battery are reacquired.

5. The startup control method of the fuel cell system according to claim 3, characterized in that: After controlling the energy-consuming components in the fuel cell vehicle to start working and determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition, the method further includes: If the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the second threshold condition, the working state of the energy-consuming component is updated and controlled, and the output voltage value of the fuel cell stack and the voltage value of the power battery are reacquired.

6. The startup control method of the fuel cell system according to claim 3, characterized in that: The controlling the energy-consuming components in the fuel cell vehicle to start working comprises: The heating module included in the energy-consuming component is controlled to enter a heating mode, and the output voltage value of the fuel cell stack is detected in real time.

7. The startup control method of the fuel cell system according to claim 1, characterized in that: When judging whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition, if the output voltage value of the fuel cell stack or the voltage value of the power battery exceeds a preset threshold range, the fuel cell system is controlled to enter a protection mode.

8. The startup control method of the fuel cell system according to claim 1, characterized in that: After determining whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet the first threshold condition, the method further includes: If the output voltage value of the fuel cell stack and the voltage value of the power battery do not meet the first threshold condition, the fuel cell system is controlled to complete startup.

9. A startup control device for a fuel cell system, characterized in that: The fuel cell system is applied to a fuel cell vehicle. The fuel cell system is provided with a fuel cell stack and a power battery. The fuel cell stack and the power battery are connected via a DC converter. The device comprises: A first judgment module, configured to judge whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a first threshold condition when receiving a start command of the fuel cell system; wherein, in the first threshold condition, Uin+ΔU>Uout, wherein Uin is the output voltage value of the fuel cell stack, Uout is the voltage value of the power battery, and ΔU is the gain voltage of the DC converter; A second judgment module is used to control the DC converter to directly couple the fuel cell stack with the load end of the vehicle and / or the power battery if the first threshold condition is met, and to judge whether the output voltage value of the fuel cell stack and the voltage value of the power battery meet a second threshold condition; wherein, in the second threshold condition, Uin+ΔU≤Uout; The first control module is configured to control the fuel cell system to start up if the second threshold condition is met.

10. An electronic device, characterized in that: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the startup control method of the fuel cell system according to any one of claims 1 to 8.

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