Fuel cell system, control method thereof, electronic apparatus, storage medium, and vehicle

Abstract

The invention relates to a fuel cell system and a control method thereof, electronic equipment, a storage medium and a vehicle. The control method comprises the following steps: identifying an operation condition of the fuel cell system; acquiring a historical cumulant of voltage attenuation under the corresponding operation condition; obtaining the attenuation amount of the average voltage under the corresponding operation condition; obtaining the current cumulant of voltage attenuation under the corresponding operation condition based on the historical cumulant and the attenuation; setting a control threshold value corresponding to the operation condition; when the current cumulant under the corresponding operation condition is greater than a control threshold value, controlling the fuel cell system to operate according to a preset strategy; wherein the control threshold value is related to the operation working condition, the current cumulant is the sum of the attenuation amount and the historical cumulant under the corresponding operation working condition, and the current cumulant is stored in the storage medium to serve as the next historical cumulant. According to the application, different working conditions can be automatically identified, and different control strategies are adopted for different working conditions to control the operation of the fuel cell system, so that the service life of the electric pile is prolonged.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a fuel cell system and a control method thereof, an electronic device, a storage medium, and a vehicle. Background Art

[0002] Studies have shown that variable load conditions, empty-start conditions, and idling conditions have a significant impact on the performance degradation of the fuel cell stack.

[0003] In the related art, the performance degradation analysis of the fuel cell system mostly adopts the qualitative analysis method, and the system as a whole is controlled by evaluating the overall degradation of the battery stack. There is a lack of automatic identification of different operating conditions, such as variable load conditions, empty start conditions, idle conditions, etc. There is also a lack of quantitative analysis of the performance degradation of the fuel cell system under different operating conditions and the control strategies adopted for different operating conditions. Therefore, controlling the system as a whole can slow down the rate of performance degradation of the battery stack to a certain extent, but it does not significantly increase the service life of the battery stack. Summary of the invention

[0004] In view of the above, it is necessary to provide a fuel cell system and its control method, electronic device, storage medium, and vehicle, which can automatically identify different operating conditions and adopt different control strategies for different operating conditions to control the operation of the fuel cell system, thereby improving the service life of the fuel cell stack.

[0005] The first aspect of the present application provides a control method for a fuel cell system, comprising: identifying an operating condition of the fuel cell system; obtaining a historical cumulative amount of voltage attenuation of the fuel cell system under a corresponding operating condition; obtaining an attenuation amount of an average voltage of the fuel cell system under a corresponding operating condition; obtaining a current cumulative amount of voltage attenuation of the fuel cell system under a corresponding operating condition based on the historical cumulative amount and the attenuation amount; setting a control threshold for the corresponding operating condition; when the current cumulative amount under the corresponding operating condition is greater than the control threshold, controlling the fuel cell system to operate with a preset strategy; wherein the control threshold is related to the operating condition, the current cumulative amount is the sum of the attenuation amount and the historical cumulative amount under the corresponding operating condition, the current cumulative amount is stored in a storage medium and is used as the next historical cumulative amount, and the preset strategy includes at least: controlling the fuel cell system to operate at a reduced rate, controlling the fuel cell system to switch operating states, and increasing the oxygen consumption of the fuel cell system during the shutdown phase.

[0006] In the first aspect of the present application, different operating conditions of the fuel cell system are first identified, and then the current cumulative amount is obtained from the historical cumulative amount of voltage attenuation under the corresponding operating condition and the attenuation of the average voltage. When the current cumulative amount is greater than the control threshold of the corresponding operating condition, the corresponding preset strategy is adopted to control the fuel cell system, such as reducing the rate, switching the operating state, or increasing the oxygen consumption in the shutdown stage, thereby accurately predicting and controlling the fuel cell stack performance attenuation of the fuel cell system and improving the service life of the stack. That is, the control method of the present application can automatically identify different operating conditions, and adopt different control strategies for different operating conditions to control the operation of the fuel cell system, thereby improving the service life of the stack.

[0007] In some embodiments, the operating conditions include at least variable load conditions, empty-start conditions and idle conditions; identifying the operating conditions of the fuel cell system includes: identifying the operating condition as a variable load condition based on changes in the average voltage of the fuel cell system; identifying the operating condition as an empty-start condition based on the start / stop state of the fuel cell system, the maximum voltage of the fuel cell system and the valve state of the fuel cell system; or, identifying the operating condition as an idle condition based on the operating power of the fuel cell system.

[0008] In some embodiments, the operating condition is a variable load condition; obtaining the attenuation of the average voltage of the fuel cell system under the corresponding operating condition, including: obtaining the cumulative change based on the change value of the average voltage of the fuel cell system; setting the voltage attenuation coefficient under the variable load condition; obtaining the attenuation based on the cumulative change and the voltage attenuation coefficient.

[0009] In some embodiments, setting a control threshold corresponding to an operating condition includes: setting a control threshold corresponding to a variable load condition. Controlling the fuel cell system to operate according to a preset strategy includes: setting a normal rate for a variable load condition; and controlling the fuel cell system to operate at a reduced rate based on the normal rate.

[0010] In some embodiments, the change value is the difference between the average voltage of the fuel cell system and the average voltage of the fuel cell system delayed by one step, wherein if the difference is greater than 0, the variable load condition is a load reduction condition, and if the difference is less than 0, the variable load condition is a load condition.

[0011] In some embodiments, the operating condition is an air-to-air start condition; obtaining the attenuation of the average voltage of the fuel cell system under the corresponding operating condition includes: setting a voltage attenuation coefficient under the air-to-air start condition; and obtaining the attenuation based on the voltage attenuation coefficient under the air-to-air start condition.

[0012] In some embodiments, setting a control threshold corresponding to an operating condition includes: setting a control threshold corresponding to an empty start condition. Controlling the fuel cell system to operate according to a preset strategy includes: setting a normal oxygen consumption time, an extended oxygen consumption time, an anode purge time, and an anode purge pressure of the fuel cell system during the shutdown phase; and increasing the oxygen consumption of the fuel cell system during the shutdown phase based on the normal oxygen consumption time, the extended oxygen consumption time, the anode purge time, and the anode purge pressure.

[0013] In some embodiments, the operating condition is an idle condition; obtaining the attenuation of the average voltage of the fuel cell system under the corresponding operating condition includes: setting a voltage attenuation coefficient under the idle condition; and obtaining the attenuation based on the voltage attenuation coefficient under the idle condition.

[0014] In some embodiments, setting a control threshold corresponding to an operating condition includes: setting a control threshold corresponding to an idle condition. Controlling the fuel cell system to operate according to a preset strategy includes: reducing the operating time of the idle condition, and controlling the fuel cell system to switch from the idle condition to the zero power condition.

[0015] A second aspect of the present application provides an electronic device, the electronic device comprising a memory and a processor, the memory storing a computer program, and the processor implementing a control method for a fuel cell system of any embodiment of the first aspect of the present application when executing the computer program.

[0016] A third aspect of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the control method of the fuel cell system of any embodiment of the first aspect of the present application is implemented.

[0017] A fourth aspect of the present application provides a fuel cell system, which predicts and controls the attenuation of a battery stack through the control method of the fuel cell system of any embodiment of the first aspect of the present application.

[0018] A fifth aspect of the present application provides a vehicle, comprising a fuel cell system, wherein the fuel cell system predicts and controls the attenuation of a battery stack through the control method of the fuel cell system of any embodiment of the first aspect of the present application.

[0019] The second to fifth aspects of the present application can achieve: automatically identifying different operating conditions, and taking different control strategies for different operating conditions to control the operation of the fuel cell system, thereby increasing the service life of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a flow chart of a control method of a fuel cell system according to an embodiment of the present application.

[0021] Figure 2It is a sub-flow chart of step S100 of an embodiment of the present application under variable load conditions.

[0022] Figure 3 It is a sub-flow chart of step S100 of an embodiment of the present application under the empty-air starting condition.

[0023] Figure 4 It is a sub-flow chart of step S300 of an embodiment of the present application under variable load conditions.

[0024] Figure 5 It is a sub-flow chart of step S300 of an embodiment of the present application under the empty-to-air starting condition.

[0025] Figure 6 It is a sub-flowchart of step S300 of an embodiment of the present application under idle condition.

[0026] Figure 7 It is a sub-flow chart of step S400 of an embodiment of the present application under variable load conditions.

[0027] Figure 8 It is a sub-flow chart of step S400 of an embodiment of the present application under the empty-air starting condition.

[0028] Fig. 9 It is a sub-flowchart of step S400 of an embodiment of the present application under idle conditions.

[0029] Fig.10 It is a sub-flow chart of step S600 of an embodiment of the present application under variable load conditions.

[0030] Fig.11 It is a sub-flow chart of step S600 of an embodiment of the present application under the empty-to-air starting condition.

[0031] Fig.12 It is a sub-flowchart of step S600 of an embodiment of the present application under idle condition.

[0032] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0033] In the description of the embodiments of the present application, words such as "exemplary", "or", "for example" and the like are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "or", "for example" and the like is intended to present related concepts in a concrete manner.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by technicians in the technical field in this application. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. It should be understood that, unless otherwise specified in this application, " / " means or. For example, A / B can represent A or B. "And / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. "At least one" means one or more. "Multiple" means two or more than two. For example, at least one of a, b or c can represent: a, b, c, a and b, a and c, b and c, a, b and c seven situations.

[0035] It should also be noted that the terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. The method disclosed in the embodiments of this application or the method shown in the flowchart includes one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged with each other, and some steps can also be deleted.

[0036] It should also be noted that the term "voltage of the fuel cell system" in the embodiment of the present application refers to the voltage of the stack in the fuel cell system, and specifically refers to the voltage of each single chip in the stack in the fuel cell system. The term "average voltage of the fuel cell system" in the embodiment of the present application refers to the average voltage of the stack in the fuel cell system, and specifically refers to the average voltage of each single chip in the stack in the fuel cell system. The term "control threshold" in the embodiment of the present application refers to the voltage value. The term "variable load condition" in the embodiment of the present application refers to the condition in which the external output power needs to be adjusted to meet the operating requirements due to load changes, including loading conditions and load reduction conditions. The term "empty start condition" in the embodiment of the present application refers to the condition in which there is air at the anode during the start-up process of the stack, and hydrogen and oxygen react directly to generate voltage that corrodes the catalyst of the stack. The term "idle condition" in the embodiment of the present application refers to the fuel cell system operating under the condition of no external power output, and the stack operates at a small current or minimum power to maintain the normal operation of the fuel cell system itself. The term "zero power condition" in the embodiment of the present application refers to the state in which the stack is in operation and has no external power output.

[0037] A fuel cell is a chemical device that converts the chemical energy of a fuel directly into electrical energy. It is also called an electrochemical generator. It is the fourth power generation technology after hydroelectric power generation, thermal power generation, and atomic power generation. Studies have shown that variable load conditions, empty-start conditions, and idling conditions have a significant impact on the performance degradation of the fuel cell system stack.

[0038] In the related art, the performance attenuation analysis of the fuel cell system mostly adopts the qualitative analysis method. Due to the lack of effective data to support the attenuation of the stack caused by different working conditions, the system as a whole is generally controlled by evaluating the overall attenuation of the stack. For example, the patent with the authorization announcement number CN116879781B proposes a life prediction method for the electrochemical performance of the solid oxide fuel cell stack, which includes the following steps: defining the failure threshold of the electrochemical performance, obtaining the corresponding voltage attenuation rate and the index requirements of the internal resistance growth rate; obtaining the voltage and current change data with the operating time required by the electrochemical performance attenuation prediction model; establishing a polarization curve model according to the operating parameters of the stack; establishing an empirical attenuation model for the stack; calculating the attenuation rate and attenuation acceleration of the stack according to the previous operating state of the stack; predicting the future attenuation trend and remaining life of the stack according to the total attenuation amplitude defined by the failure threshold of the stack.

[0039] However, the relevant technology lacks automatic identification of different operating conditions, such as variable load conditions, empty-start conditions, idling conditions, etc. There is also a lack of quantitative analysis of the performance degradation of the fuel cell system under different operating conditions and control strategies for different operating conditions. Therefore, although controlling the system as a whole can slow down the rate of performance degradation of the stack to a certain extent, it does not significantly increase the service life of the stack.

[0040] To this end, the embodiments of the present application provide a fuel cell system and a control method thereof, an electronic device, a storage medium, and a vehicle, which can automatically identify different operating conditions and adopt different control strategies for different operating conditions to control the operation of the fuel cell system, thereby improving the service life of the fuel cell stack. Some embodiments will be described below in conjunction with the accompanying drawings. The following embodiments and features in the embodiments may be combined with each other without conflict.

[0041] Figure 1 It is a flow chart of a control method of a fuel cell system according to an embodiment of the present application.

[0042] The embodiment of the present application provides a control method for a fuel cell system. For the convenience of description, the control method for a fuel cell system is hereinafter referred to as a "control method" or "method". Figure 1 , the control method of the embodiment of the present application may include: Step S100: Identify the operating condition of the fuel cell system.

[0043] The operating conditions of the fuel cell system may include at least a variable load condition, an empty start condition and an idle condition. In step S100, the operating condition may be identified as a variable load condition based on a change in the average voltage of the fuel cell system, or the operating condition may be identified as an empty start condition based on a start / stop state of the fuel cell system, a maximum voltage of the fuel cell system and a valve state of the fuel cell system, or the operating condition may be identified as an idle condition based on the operating power of the fuel cell system.

[0044] Figure 2 It is a sub-flow chart of step S100 of an embodiment of the present application under variable load conditions.

[0045] In the examples of this application, please refer to Figure 2 , based on the change of the average voltage of the fuel cell system, identifying the operating condition as a variable load condition may include: Step S110: acquiring the average voltage of the fuel cell system and the average voltage delayed by one step.

[0046] Step S111: obtaining an average voltage difference based on the average voltage and the average voltage delayed by one step.

[0047] Step S112: determine whether the average voltage difference is greater than 0.

[0048] In step S110, the "step length" may refer to the interval of a time operation, that is, the time interval for controlling the average voltage change. In step S111, the average voltage difference may be expressed as: δV=V mean -V mean1 , where V mean is the average voltage of the fuel cell system, V mean1 is the average voltage of the fuel cell system delayed by one step. In step S112, if the average voltage difference δV is greater than 0, the variable load condition is a load reduction condition, and if the average voltage difference δV is less than 0, the variable load condition is a load condition.

[0049] Figure 3 It is a sub-flow chart of step S100 of an embodiment of the present application under the empty-air starting condition.

[0050] In the examples of this application, please refer to Figure 3 Based on the start / stop state of the fuel cell system, the maximum voltage of the fuel cell system, and the valve state of the fuel cell system, identifying the operating condition as an empty start condition may include: Step S120: acquiring the start / stop state of the fuel cell system, the maximum voltage of the fuel cell system, and the valve state of the fuel cell system.

[0051] The maximum voltage of the fuel cell system can be obtained through the fuel cell inspection module (Cell Voltage Monitor, CVM). The valve status of the fuel cell system can at least include the status of the hydrogen injection main valve (Posn H2 ) and cathode stack cut-off valve status (Posn AIR ), Posn H2 Greater than 0 means the main hydrogen injection valve is open. H2 Less than 0 means the main hydrogen injection valve is closed. AIR Greater than 0 means the cathode cut-off valve is open. AIR Less than 0 means the cathode stack shut-off valve is closed.

[0052] Step S121: Based on the start / stop state of the fuel cell system and the valve state of the fuel cell system, the startup state of the fuel cell system is acquired.

[0053] When the fuel cell system is in the startup state and Posn H2 Less than 0 and Posn AIR When it is less than 0, it is determined that the fuel cell system is in the startup state.

[0054] Step S122: based on the maximum voltage of the fuel cell system, obtaining the empty-to-air start state of the fuel cell system.

[0055] Among them, if the maximum voltage of the fuel cell system (V max ) is greater than the maximum voltage setting threshold (V airstart ), the fuel cell system has an empty start. In this case, it is possible to detect whether the stack of the fuel cell system has a high potential, thereby determining whether the fuel cell system has an empty start.

[0056] In some embodiments, the maximum voltage setting threshold (V airstart ) can be 400mv (millivolts).

[0057] Step S123: Based on the startup state and the empty-start state of the fuel cell system, determine whether the startup state of the fuel cell system includes an empty-start state.

[0058] Wherein, if the fuel cell system is already in the startup state and the fuel cell system has an empty-air start, it is determined that the startup state of the fuel cell system has an empty-air start, that is, the fuel cell system operates in an empty-air start condition.

[0059] In an embodiment of the present application, based on the operating power of the fuel cell system, the operating condition is identified as an idle condition. For example, under the idle condition, the power generation power range of the fuel cell system is 4.5Kw to 12Kw (kilowatts), and this range is the idle condition.

[0060] In other embodiments, the operating conditions of the fuel cell system may also include low-temperature start-up conditions, high-load operating conditions (also called "overload conditions"), impurity conditions, and other operating conditions.

[0061] See also Figure 1 , the control method of the embodiment of the present application may also include: Step S200: Obtain the historical cumulative amount of voltage decay of the fuel cell system under the corresponding operating condition.

[0062] The historical cumulative amount may be the voltage decay cumulative amount stored in the storage medium last time.

[0063] In some embodiments, the storage medium may include a non-volatile memory (NVM), for example, the storage medium may include at least one of ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EAROM (Electrically Alterable Read Only Memory), EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory) or Flash Memory.

[0064] It can be understood that obtaining the historical cumulative amount of voltage decay of the fuel cell system under the corresponding operating conditions is to read the cumulative amount of voltage decay last stored in the storage medium such as ROM, PROM, EAROM, EPROM, EEPROM or FlashMemory, for example, V nvdamp Indicates reading the accumulated voltage decay caused by the last load change condition stored in EEROM, V nvcell Indicates reading the accumulated voltage decay caused by the last idle condition stored in the EEROM, V nvairstart Indicates reading the accumulated voltage decay caused by the last empty-start condition stored in the EEROM.

[0065] See also Figure 1 , the control method of the embodiment of the present application may also include: Step S300: obtaining the attenuation of the average voltage of the fuel cell system under the corresponding operating condition.

[0066] Among them, as mentioned above, the operating conditions may include but are not limited to variable load conditions, empty start conditions, idle conditions, low temperature start conditions, high load operating conditions and impurity conditions.

[0067] Figure 4 It is a sub-flow chart of step S300 of an embodiment of the present application under variable load conditions.

[0068] See also Figure 4 In some embodiments, if the operating condition is a variable load condition, step S300 may include: Step S310: Obtaining a cumulative change based on the change value of the average voltage of the fuel cell system.

[0069] The change value can be represented by δV1, which is the difference between the average voltage of the fuel cell system and the average voltage of the fuel cell system delayed by one step. If δV1 is greater than 0, the variable load condition is a load reduction condition. If δV1 is less than 0, the variable load condition is a load condition.

[0070] In some embodiments, the cumulative change can be expressed as V total Indicates that V total It can be the integral of the change value δV1, that is: V total =∫δV1dt.

[0071] Step S311: setting the voltage attenuation coefficient under variable load conditions.

[0072] Among them, the voltage attenuation coefficient under variable load conditions can be expressed by α var Indicates that the voltage attenuation coefficient α under variable load conditions var Related to the stack voltage of the fuel cell system under variable load conditions.

[0073] In some embodiments, the voltage attenuation coefficient α under variable load conditions var It can be equal to 0.000027058 [μV / V], where V is the stack voltage and μ is the statistical correlation coefficient of the data.

[0074] In other embodiments, the voltage attenuation coefficient α under variable load conditions is var The average voltage of the fuel cell system and the voltage attenuation coefficient α under variable load conditions can be used to calculate the var The relationship table is obtained by looking up the table, and the relationship table is as follows: Step S312: Obtaining the attenuation amount based on the cumulative change amount and the voltage attenuation coefficient.

[0075] Among them, the attenuation under variable load conditions can be expressed by V damp Indicates that the attenuation V dampIt can be the integral of the product of the cumulative change and the voltage attenuation coefficient, that is, V damp =∫α var δV1dt.

[0076] Figure 5 It is a sub-flow chart of step S300 of an embodiment of the present application under the empty-to-air starting condition.

[0077] See also Figure 5 In some embodiments, if the operating condition is an empty start condition, step S300 may include: Step S320: setting the voltage attenuation coefficient under the air-to-air starting condition.

[0078] Among them, the voltage attenuation coefficient under the air-to-air starting condition can be expressed by α airstart Indicates that the voltage attenuation coefficient α under air-to-air starting conditions airstart Related to the stack voltage of the fuel cell system under air-to-air start conditions.

[0079] In some embodiments, the voltage attenuation coefficient α under air-to-air starting conditions airstart It can be equal to 0.025[μV], where V is the stack voltage and μ is the statistical correlation coefficient of the data.

[0080] Step S321: Obtain the attenuation amount based on the voltage attenuation coefficient under the air-to-air starting condition.

[0081] Among them, the attenuation under the air-to-air starting condition can be expressed by V airstart Indicates that the attenuation V airstart It can be the sum of the voltage attenuation coefficients, that is, V airstart =∑α airstart .

[0082] Figure 6 It is a sub-flowchart of step S300 of an embodiment of the present application under idle condition.

[0083] See also Figure 6 In some embodiments, if the operating condition is an idle condition, step S300 may include: Step S330: setting the voltage attenuation coefficient under the idle condition.

[0084] Among them, the voltage attenuation coefficient under idle condition can be expressed as α cell Indicates that the voltage attenuation coefficient α under idle conditions cell Related to the stack voltage of the fuel cell system under idle conditions.

[0085] In some embodiments, the voltage attenuation coefficient α under idle conditions cell It can be equal to 0.0872427 [μV], where V is the stack voltage and μ is the statistical correlation coefficient of the data.

[0086] In other embodiments, the voltage attenuation coefficient α under idle conditions is cell The voltage attenuation coefficient α under the condition of idling and the temperature of the fuel cell system can be cell The relationship table is obtained by looking up the table, and the relationship table is as follows: Step S331: Obtain the attenuation amount based on the voltage attenuation coefficient under the idle condition.

[0087] Among them, the attenuation under idling condition can be expressed by V cell Indicates that the attenuation V cell It can be the integral of the product of the voltage attenuation coefficient, that is, V cell =∫α cell (t)dt.

[0088] See also Figure 1 , the control method of the embodiment of the present application may also include: Step S400: Based on the historical accumulation amount and the attenuation amount, obtain the current accumulation amount of the voltage attenuation of the fuel cell system under the corresponding operating condition.

[0089] The current cumulative amount is the sum of the attenuation amount and the historical cumulative amount under the corresponding operating condition, and the current cumulative amount is stored in the storage medium and used as the next historical cumulative amount.

[0090] Figure 7 It is a sub-flow chart of step S400 of an embodiment of the present application under variable load conditions.

[0091] See also Figure 7 In some embodiments, if the operating condition is a variable load condition, step S400 may include: Step S410: reading the historical accumulation of voltage decay under the previous variable load condition in the storage medium.

[0092] Step S411: based on the historical cumulative amount of voltage decay under the previous variable load condition and the attenuation amount under the variable load condition, the current cumulative amount of voltage decay under the variable load condition is obtained.

[0093] Among them, the historical accumulation of voltage attenuation under the previous variable load condition can be expressed as V nvdamp Indicates that the current cumulative amount of voltage attenuation under variable load conditions can be expressed as V totaldamp Indicates that the current cumulative amount is the sum of the attenuation amount under the corresponding operating condition and the historical cumulative amount, that is, V totaldamp =V nvdamp +V damp .

[0094] Figure 8It is a sub-flow chart of step S400 of an embodiment of the present application under the empty-air starting condition.

[0095] See also Figure 8 In some embodiments, if the operating condition is an empty start condition, step S400 may include: Step S420: Read the historical cumulative amount of voltage decay under the previous empty-air starting condition in the storage medium.

[0096] Step S421: Based on the historical cumulative amount of voltage decay under the previous air-to-air starting condition and the attenuation amount under the air-to-air starting condition, the current cumulative amount of voltage decay under the air-to-air starting condition is obtained.

[0097] Among them, the historical accumulation of voltage decay under the previous empty-air starting condition can be expressed as V nvairstart Indicates that the current cumulative amount of voltage decay under the empty-start condition can be expressed as V totalairstart Indicates that the current cumulative amount is the sum of the attenuation amount under the corresponding operating condition and the historical cumulative amount, that is, V totalairstart =V nvairstart +V airstart .

[0098] Fig. 9 It is a sub-flowchart of step S400 of an embodiment of the present application under idle conditions.

[0099] See also Fig. 9 In some embodiments, if the operating condition is an idle condition, step S400 may include: Step S430: Read the historical accumulation of voltage decay under the previous idle condition in the storage medium.

[0100] Step S431: based on the historical cumulative amount of voltage decay under the previous idle condition and the decay amount under the idle condition, obtain the current cumulative amount of voltage decay under the idle condition.

[0101] Among them, the historical accumulation of voltage decay under the previous idle condition can be expressed as V nvcell Indicates that the current cumulative amount of voltage decay under idle conditions can be expressed as V totalcell Indicates that the current cumulative amount is the sum of the attenuation amount under the corresponding operating condition and the historical cumulative amount, that is, V totalcell =V nvcell +V cell .

[0102] See also Figure 1 , the control method of the embodiment of the present application may also include: Step S500: setting a control threshold corresponding to the operating condition.

[0103] The control threshold is related to the operating condition. If the operating condition is a variable load condition, then the control threshold corresponding to the variable load condition is set. V dampdmd If the operating condition is an empty start condition, then set the control threshold corresponding to the empty start condition. You can use V airstartdmd If the operating condition is the idle condition, then set the control threshold corresponding to the idle condition. You can use V celldmd express.

[0104] See also Figure 1 , the control method of the embodiment of the present application may also include: Step S600: When the current accumulation amount under the corresponding operating condition is greater than the control threshold, the fuel cell system is controlled to operate according to a preset strategy.

[0105] The preset strategy at least includes: controlling the fuel cell system to operate at a reduced rate, controlling the fuel cell system to switch operating states, and increasing the oxygen consumption of the fuel cell system during the shutdown phase.

[0106] Fig.10 It is a sub-flow chart of step S600 of an embodiment of the present application under variable load conditions.

[0107] See also Fig.10 In some embodiments, if the operating condition is a variable load condition, step S600 may include: Step S610: Setting the normal rate of the variable load condition.

[0108] Step S611: Control the fuel cell system to operate at a reduced rate based on the normal rate.

[0109] Therefore, if the current cumulative amount of voltage decay under variable load conditions V totaldamp Greater than the control threshold V of the strain load condition dampdmd , the fuel cell system can be controlled to operate at a reduced rate to reduce the stack attenuation rate of the fuel cell system.

[0110] Fig.11 It is a sub-flow chart of step S600 of an embodiment of the present application under the empty-to-air starting condition.

[0111] See also Fig.11 In some embodiments, if the operating condition is an empty start condition, step S600 may include: Step S620: setting the normal oxygen consumption time, extended oxygen consumption time, anode purge time and anode purge pressure of the fuel cell system during the shutdown phase.

[0112] Step S621: increasing the oxygen consumption of the fuel cell system during the shutdown phase based on the normal oxygen consumption time, the extended oxygen consumption time, the anode purge time, and the anode purge pressure.

[0113] Therefore, if the current cumulative amount of voltage decay under the empty-air starting condition is V totalairstart Greater than the control threshold V of the empty start condition airstartdmd , the stack attenuation problem of the fuel cell system can be reduced by increasing the oxygen consumption of the fuel cell system during the shutdown phase.

[0114] Fig.12 It is a sub-flowchart of step S600 of an embodiment of the present application under idle condition.

[0115] See also Fig.12 In some embodiments, if the operating condition is an idle condition, step S600 may include: Step S630: Reduce the operating time of the idle condition.

[0116] Step S631: Control the fuel cell system to switch from the idle condition to the zero power condition.

[0117] Therefore, if the current cumulative amount of voltage decay under idle conditions V totalcell Greater than the control threshold V of the idle condition celldmd , the fuel cell system can be controlled to switch the operating state to reduce the stack attenuation problem of the fuel cell system.

[0118] In the control method of the embodiment of the present application, different operating conditions of the fuel cell system are first identified, and then the current cumulative amount is obtained from the historical cumulative amount of voltage attenuation under the corresponding operating condition and the attenuation of the average voltage. When the current cumulative amount is greater than the control threshold of the corresponding operating condition, the corresponding preset strategy is adopted to control the fuel cell system, such as reducing the rate, switching the operating state, or increasing the oxygen consumption in the shutdown stage, so as to accurately predict and control the fuel cell stack performance attenuation of the fuel cell system and improve the service life of the stack. That is, the control method of the present application can automatically identify different operating conditions, and adopt different control strategies for different operating conditions to control the operation of the fuel cell system, thereby improving the service life of the stack.

[0119] An embodiment of the present application further provides an electronic device, the electronic device comprising a memory and a processor, the memory storing a computer program, and the processor implementing the control method of the fuel cell system of any of the above embodiments of the present application when executing the computer program.

[0120] An embodiment of the present application further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the control method of the fuel cell system of any of the above embodiments of the present application is implemented.

[0121] An embodiment of the present application also provides a fuel cell system, which predicts and controls the attenuation of a battery stack through the control method of the fuel cell system of any of the above embodiments of the present application.

[0122] An embodiment of the present application further provides a vehicle, comprising a fuel cell system, wherein the fuel cell system predicts and controls the attenuation of a battery stack through the control method of the fuel cell system of any of the above embodiments of the present application.

[0123] The present application can achieve: automatic identification of different operating conditions, and adopting different control strategies for different operating conditions to control the operation of the fuel cell system, thereby increasing the service life of the fuel cell stack.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A control method for a fuel cell system, characterized in that: include: Identifying an operating condition of the fuel cell system; Obtaining a historical cumulative amount of voltage decay of the fuel cell system corresponding to the operating condition; Obtaining an attenuation amount of an average voltage of the fuel cell system corresponding to the operating condition; Based on the historical cumulative amount and the attenuation amount, obtaining a current cumulative amount of voltage attenuation of the fuel cell system corresponding to the operating condition; Setting a control threshold corresponding to the operating condition; When the current accumulated amount corresponding to the operating condition is greater than the control threshold, controlling the fuel cell system to operate according to a preset strategy; Among them, the control threshold is related to the operating condition, the current cumulative amount is the sum of the attenuation amount and the historical cumulative amount under the corresponding operating condition, the current cumulative amount is stored in a storage medium and used as the next historical cumulative amount, and the preset strategy at least includes: controlling the fuel cell system to operate at a reduced rate, controlling the fuel cell system to switch operating states, and increasing the oxygen consumption of the fuel cell system during the shutdown stage.

2. The control method of the fuel cell system according to claim 1, characterized in that: The operating conditions at least include variable load conditions, empty start conditions and idle conditions; The identifying the operating condition of the fuel cell system includes: Based on the change of the average voltage of the fuel cell system, identifying the operating condition as the variable load condition; Based on the start / stop state of the fuel cell system, the maximum voltage of the fuel cell system, and the valve state of the fuel cell system, identifying that the operating condition is the empty-to-empty starting condition; Or, based on the operating power of the fuel cell system, the operating condition is identified as an idle condition.

3. The control method of the fuel cell system according to claim 2, characterized in that: The operating condition is the variable load condition; The obtaining of the attenuation of the average voltage of the fuel cell system corresponding to the operating condition includes: Obtaining a cumulative change based on a change value of an average voltage of the fuel cell system; Setting the voltage attenuation coefficient under the variable load condition; The attenuation amount is obtained based on the accumulated change amount and the voltage attenuation coefficient.

4. The control method of the fuel cell system according to claim 3, characterized in that: The setting of the control threshold corresponding to the operating condition includes: Setting a control threshold corresponding to the variable load condition; The controlling the fuel cell system to operate according to a preset strategy includes: Setting the normal speed of the variable load condition; The fuel cell system is controlled to operate at a reduced rate based on the normal rate.

5. The control method of the fuel cell system according to claim 3, characterized in that: The change value is the difference between the average voltage of the fuel cell system and the average voltage of the fuel cell system delayed by one step, wherein if the difference is greater than 0, the variable load condition is a load reduction condition, and if the difference is less than 0, the variable load condition is a load condition.

6. The control method of the fuel cell system according to claim 2, characterized in that: The operating condition is the empty-to-empty starting condition; The obtaining of the attenuation of the average voltage of the fuel cell system corresponding to the operating condition includes: Setting the voltage attenuation coefficient under the air-to-air starting condition; The attenuation amount is obtained based on the voltage attenuation coefficient under the air-to-air starting condition.

7. The control method of the fuel cell system according to claim 6, characterized in that: The setting of the control threshold corresponding to the operating condition includes: Setting a control threshold corresponding to the air-to-air start condition; The controlling the fuel cell system to operate according to a preset strategy includes: Setting the normal oxygen consumption time, extended oxygen consumption time, anode purge time and anode purge pressure of the fuel cell system during the shutdown phase; The oxygen consumption of the fuel cell system during the shutdown phase is increased based on the normal oxygen consumption time, the extended oxygen consumption time, the anode purge time, and the anode purge pressure.

8. The control method of the fuel cell system according to claim 2, characterized in that: The operating condition is the idle condition; The obtaining of the attenuation of the average voltage of the fuel cell system corresponding to the operating condition includes: Setting the voltage attenuation coefficient under the idle condition; The attenuation amount is obtained based on the voltage attenuation coefficient under the idle condition.

9. The control method of the fuel cell system according to claim 8, characterized in that: The setting of the control threshold corresponding to the operating condition includes: Setting a control threshold corresponding to the idle condition; The controlling the fuel cell system to operate according to a preset strategy includes: The operation time of the idle condition is reduced, and the fuel cell system is controlled to switch from the idle condition to the zero power condition.

10. An electronic device, characterized in that: The electronic device includes a memory and a processor, the memory stores a computer program, and the processor implements the control method of the fuel cell system according to any one of claims 1 to 9 when executing the computer program.

11. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the control method of the fuel cell system according to any one of claims 1 to 9 is implemented.

12. A fuel cell system, characterized in that: The attenuation of the battery stack is predicted and controlled by the control method of the fuel cell system according to any one of claims 1 to 9.

13. A vehicle, characterized in that: It comprises a fuel cell system, which predicts and controls the attenuation of a battery stack by using the control method of the fuel cell system according to any one of claims 1 to 9.

Images