PTC control methods, devices, equipment and media for fuel cell systems

Abstract

This invention discloses a PTC control method, apparatus, device, and medium for a fuel cell system, relating to the field of PTC control technology for fuel cell systems. The method includes: establishing a mapping relationship between the PTC operating scenario of the fuel cell system and a preset control strategy; collecting thermal management parameters, electrical parameters, and system state parameters of the fuel cell system to determine the current PTC operating scenario; and determining the current control strategy based on the mapping relationship and the current PTC operating scenario. The preset control strategy is a strategy that controls at least one of the following: PTC load connection status, PTC switching timing, or DC-DC converter operating mode. This invention achieves adaptive control for different operating conditions, avoiding the problem that a single fixed control logic cannot accommodate multiple operational needs, and improving the flexibility and accuracy of system control.

Description

Technical Field

[0001] This application relates to the field of PTC control technology for fuel cell systems, specifically to a PTC control method, device, equipment, and medium for fuel cell systems. Background Technology

[0002] Fuel cell systems generate heat during operation. To ensure the stack operates within a suitable temperature range, especially during startup in low-temperature environments, a thermal management system is typically required to heat the coolant. Positive temperature coefficient heaters (PTCs) are commonly used in the thermal management of fuel cell systems due to their high heating efficiency and ease of control.

[0003] However, existing PTC control schemes for fuel cell systems still have the following technical problems in practical applications: Under low-temperature cold start conditions, simultaneous activation of all PTCs can easily generate large current surges, damaging electrical components and reducing system reliability; under rapid warm-up conditions, a single heat source leads to low heating efficiency, long warm-up time, and high energy consumption; after system shutdown, there is a lack of effective high-voltage discharge strategies, posing a safety hazard due to residual voltage and increasing hardware costs due to the need for additional discharge resistors. Therefore, there is an urgent need for a PTC control method that can balance start-up safety, warm-up efficiency, and system safety. Summary of the Invention

[0004] This application provides a PTC control method, device, equipment, and medium for a fuel cell system, which can solve the technical problem in the prior art that it is impossible to control the PTC differently according to different scenarios.

[0005] In a first aspect, embodiments of this application provide a PTC control method for a fuel cell system, the PTC control method for the fuel cell system comprising: Establish a mapping relationship between the PTC operating scenarios and preset control strategies of the fuel cell system; Collect thermal management parameters, electrical parameters, and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system; Based on the mapping relationship and the current PTC operating scenario of the fuel cell system, the current control strategy is determined; The preset control strategy is a strategy that controls at least one of the following: the PTC load connection status, the PTC switching timing, or the DC-DC operating mode.

[0006] In conjunction with the first aspect, in one implementation method: The preset control strategy includes a first control strategy, a second control strategy, and a third control strategy; The first control strategy is used to control the first PTC and the second PTC in the fuel cell system to turn on or off sequentially at a preset time interval; The second control strategy is used to control the DCDC to switch its operating mode from normal power supply mode to constant voltage mode, and to control the DCDC to operate with high current and low voltage and turn on the first PTC; The third control strategy is used to control the first PTC to be connected to the high-voltage circuit of the fuel cell system as an energy-consuming load, and to turn on the first PTC.

[0007] In conjunction with the first aspect, in one implementation method: The thermal management parameters include: coolant inlet temperature and first PTC outlet temperature; The electrical parameters include: system power, air compressor voltage, and bus voltage; The system status parameters are: startup status, running status, and shutdown status.

[0008] In conjunction with the first aspect, in one implementation, the step of collecting thermal management parameters, electrical parameters, and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system includes: Collect thermal management parameters, electrical parameters, and system status parameters of the fuel cell system, and determine the current PTC operating scenario of the fuel cell system based on the collected thermal management parameters, electrical parameters, and system status parameters: If the system status parameters are in the start-up state, and the first PTC outlet temperature and coolant inlet temperature are both lower than the preset temperature threshold, the current PTC operating scenario of the fuel cell system is determined to be low-temperature cold start. If the system status parameters are in the running state, and the system power is at idle power and the coolant inlet temperature is lower than the preset warm-up threshold, the current PTC working scenario of the fuel cell system is determined to be rapid warm-up; If the system status parameter is in the off state, and the air compressor voltage or bus voltage is higher than the preset voltage threshold, the current PTC working scenario of the fuel cell system is determined to be high-pressure discharge.

[0009] In conjunction with the first aspect, in one implementation, determining the current control strategy based on the mapping relationship and the current PTC operating scenario of the fuel cell system includes: If the current PTC operating scenario of the fuel cell system is low temperature cold start, then the first control strategy is confirmed as the current control strategy; If the current PTC operating scenario of the fuel cell system is rapid warm-up, then the second control strategy is confirmed as the current control strategy; If the current PTC operating scenario of the fuel cell system is high-voltage discharge, then the third control strategy is confirmed as the current control strategy.

[0010] In conjunction with the first aspect, in one embodiment, after confirming that the first control strategy is the current control strategy if the current PTC operating scenario of the fuel cell system is low-temperature cold start, the method further includes: When the first relay used to control the on / off state of the first PTC is closed and the second relay used to control the on / off state of the second PTC is open, or when the second relay is closed and the first relay remains closed, if the increase in total PTC power consumption within a preset time is less than a preset value and continues for a preset time, it is determined that the corresponding PTC has an open circuit fault. When the first relay is disconnected and the second relay remains closed, or when the second relay is disconnected and the first relay remains closed, if the reduction in total PTC power consumption within a preset time is less than a preset value and continues for a preset time, it is determined that the corresponding relay has a sticking fault. When both the first and second relays are in the off state, if the absolute value of the total PTC power consumption is greater than the preset value and continues for a preset time, it is determined that at least one PTC power is abnormally faulty.

[0011] In conjunction with the first aspect, in one embodiment, after confirming that the third control strategy is the current control strategy if the current PTC operating scenario of the fuel cell system is high-voltage discharge, the method further includes: Monitor the air compressor voltage. When the air compressor voltage is less than the preset voltage threshold or the time for using the third control strategy exceeds the preset discharge time, control the first PTC to disconnect.

[0012] Secondly, embodiments of this application provide a fuel cell system PTC control device, the fuel cell system PTC control device comprising: A module is established to create a mapping relationship between the PTC operating scenarios of the fuel cell system and the preset control strategies; The data acquisition module is used to collect thermal management parameters, electrical parameters, and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system. The determination module is used to determine the current control strategy based on the mapping relationship and the current PTC operating scenario of the fuel cell system. The preset control strategy is a strategy that controls at least one of the following: the PTC load connection status, the switching sequence of multiple PTCs, or the DC-DC operating mode.

[0013] Thirdly, embodiments of this application provide a fuel cell system PTC control device, the fuel cell system PTC control device including a processor, a memory, and a fuel cell system PTC control program stored in the memory and executable by the processor, wherein when the fuel cell system PTC control program is executed by the processor, it implements the steps of the fuel cell system PTC control method as described in any one of claims 1 to 7.

[0014] Fourthly, embodiments of this application provide a computer-readable storage medium storing a fuel cell system PTC control program, wherein when the fuel cell system PTC control program is executed by a processor, it implements the steps of the fuel cell system PTC control method as described in any one of claims 1 to 7.

[0015] The beneficial effects of the technical solutions provided in this application include: This application embodiment establishes a mapping relationship between PTC operating scenarios and preset control strategies, and combines the collection of multi-dimensional parameters such as thermal management, electrical, and system status to determine the current scenario. This achieves adaptive control for different operating conditions, avoiding the problem that a single fixed control logic cannot accommodate multiple operational needs, and improving the flexibility and accuracy of system control. This application embodiment also comprehensively improves the thermal management performance, operational reliability, and safety of the fuel cell system by specifically controlling at least one of the following: PTC load connection status, PTC switching timing, and DC-DC operating mode. Attached Figure Description

[0016] Figure 1 A schematic flowchart of the PTC control method for a fuel cell system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a fuel cell system provided in an embodiment of this application; Figure 3 A schematic diagram of the functional modules of the PTC control device for a fuel cell system provided in an embodiment of this application. Detailed Implementation

[0017] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0019] This application provides a PTC control method, device, equipment, and medium for a fuel cell system, which can solve the technical problem in the prior art that it is impossible to control the PTC differently according to different scenarios.

[0020] In a first aspect, embodiments of this application provide a PTC control method for a fuel cell system.

[0021] In one embodiment, reference is made to Figure 1 , Figure 1 This is a schematic flowchart illustrating the PTC control method for a fuel cell system provided in an embodiment of this application. Figure 1 As shown, the PTC control method for a fuel cell system specifically includes the following steps: Step S1: Establish the mapping relationship between the PTC working scenario of the fuel cell system and the preset control strategy.

[0022] The preset control strategy is a strategy that controls at least one of the following: the PTC load connection status, the PTC switching timing, or the DC-DC operating mode.

[0023] The PTC (Positive Temperature Coefficient) load connection status specifically refers to the electrical on / off state between the PTC and the high-voltage DC bus. This on / off state is controlled by a high-voltage output side conduction relay. When the relay is closed, the PTC is connected to the high-voltage DC bus; when the relay is open, the PTC is isolated from the high-voltage DC bus. The PTC switching sequence refers to the orderly control of the on / off states of one or more PTCs in a time sequence. The switching sequence includes the order in which each PTC closes and opens, and the time interval between adjacent actions. By adjusting the switching sequence of each PTC, the total heating power of the PTC can be applied in stages. The DCDC (Direct Current to Direct Current Converter) operating mode specifically refers to the various configurable functional states of the DCDC during operation, such as buck mode, constant voltage mode, and constant current mode. Switching between operating modes can change the input and output voltage relationship of the DCDC.

[0024] Figure 2 This is a schematic diagram of the structure of a fuel cell system provided in an embodiment of this application. (Reference) Figure 2The fuel cell system provided in this application includes two PTCs, specifically a first PTC and a second PTC, which are connected in parallel and connected to the high-voltage bus via a high-voltage output side conduction relay. The high-voltage side of the DC-DC converter is connected to the high-voltage bus, and the low-voltage side is connected to the fuel cell stack. A water pump is used to drive the coolant circulation, and a temperature control valve is used to regulate the circulation path of the coolant through the fuel cell stack. The coolant flow path sequentially passes through the water pump, the temperature control valve, the first PTC, the second PTC, and the fuel cell stack. Temperature sensors are installed at both the inlet and outlet ends of the fuel cell stack. A heat dissipation device is connected in parallel to the temperature control valve and the first PTC.

[0025] Furthermore, a first relay is connected in series in the power supply branch of the first PTC to control the on / off state of the first PTC, and a second relay is connected in series in the power supply branch of the second PTC to control the on / off state of the second PTC. The fuel cell controller is communicatively connected to the first relay, the second relay, the DC-DC converter, the water pump, and the temperature control valve to send control commands.

[0026] In this embodiment, the preset control strategy includes a first control strategy, a second control strategy, and a third control strategy.

[0027] The first control strategy controls the first and second PTCs in the fuel cell system to turn on or off sequentially at preset time intervals. Specifically, after the first and second PTCs are turned on, they heat the coolant in the fuel cell stack. By staggering the opening and closing of the first and second PTCs, current surges caused by simultaneous switching are avoided, protecting electrical components. Simultaneously, the water pump can be activated, and the temperature control valve operates in a small circulation mode. Periodic intermittent heating ensures the stability and efficiency of the heating process, avoids current surges, and improves the system's start-up reliability in low-temperature environments. In this embodiment, the preset time interval can be 0.5 seconds. For example, the first relay can be closed first, followed by a 0.5-second interval before closing the second relay; conversely, the first relay can be disconnected first, followed by a 0.5-second interval before disconnecting the second relay.

[0028] The second control strategy switches the DC-DC converter's operating mode from normal power supply mode to constant voltage mode, controlling it to operate with high current and low voltage and activating the first PTC. Specifically, the first PTC is activated for heating; if the first relay malfunctions, the second PTC is closed to rapidly increase the coolant temperature. By combining the high-current operation of the DC-DC converter in constant voltage mode with the heating of the first PTC, the coolant temperature can be rapidly increased, shortening the warm-up time, improving the start-up efficiency and performance of the fuel cell system, and reducing energy consumption.

[0029] The third control strategy is used to control the first PTC to be connected to the high-voltage circuit of the fuel cell system as an energy-consuming load and to open the first PTC. Specifically, by controlling the first PTC to release high voltage under specific conditions, the safety of system shutdown is ensured, the risk of high voltage residue is prevented, and the system safety is improved.

[0030] This application embodiment establishes a mapping relationship between the PTC working scenario of the fuel cell system and the preset control strategy, thereby realizing adaptive control for different operating conditions. This avoids the problem that a single fixed control logic cannot take into account multiple operating requirements, and improves the flexibility and accuracy of fuel cell system control.

[0031] Step S2: Collect thermal management parameters, electrical parameters and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system.

[0032] In this embodiment of the application, step S2 specifically includes the following determination steps: Step S21: Collect the thermal management parameters, electrical parameters and system status parameters of the fuel cell system, and determine the current PTC working scenario of the fuel cell system based on the collected thermal management parameters, electrical parameters and system status parameters.

[0033] In this embodiment, thermal management parameters include: coolant inlet temperature and first PTC outlet temperature. Electrical parameters include: system power, air compressor voltage, and bus voltage. System status parameters include: startup status, running status, and shutdown status.

[0034] Specifically, by using system state parameters, irrelevant control strategies can be eliminated first, avoiding logical conflicts. Among the thermal management parameters, the coolant inlet temperature reflects the core temperature of the fuel cell stack, and the outlet temperature of the first PTC reflects the actual operating performance of the first PTC. Electrical parameters reflect the energy supply capacity of the fuel cell system and high-voltage safety risks.

[0035] Step S22: If the system status parameter is in the start-up state, and the first PTC outlet temperature and coolant inlet temperature are both lower than the preset temperature threshold, the current PTC working scenario of the fuel cell system is determined to be low temperature cold start.

[0036] Specifically, when the system status parameters are in the startup state, the electrical components in the system are most sensitive to current surges. At the same time, by eliminating local temperature errors through thermal management parameters, it is confirmed that the entire thermal management circuit is in a cold state. Only then is it determined that the PTC working scenario is a low-temperature cold start.

[0037] Step S23: If the system status parameters are in the running state, and the system power is at idle power and the coolant inlet temperature is lower than the preset warm-up threshold, the current PTC working scenario of the fuel cell system is determined to be rapid warm-up.

[0038] Specifically, when the system has started to work normally, but the system power is at idle power, it means that the system has excess energy available for heating without affecting power output or normal system operation. When the coolant inlet temperature is lower than the preset warm-up threshold, it means that the fuel cell stack has not yet reached the optimal operating temperature and has some room for temperature rise.

[0039] Step S24: If the system status parameter is in the off state, and the air compressor voltage or bus voltage is higher than the preset voltage threshold, the current PTC working scenario of the fuel cell system is determined to be high-pressure discharge.

[0040] Specifically, when the system status parameter is in the off state, it means that the system should theoretically not have high-voltage output. However, if the air compressor voltage or bus voltage is higher than the preset voltage threshold, it means that there is residual charge in the high-voltage circuit. Therefore, high-voltage discharge is required to ensure safety. In this embodiment, the preset voltage threshold can be 60V.

[0041] In the embodiments of this application, steps S22 to S24 are parallel determination steps, and the step numbers do not represent the order of determination.

[0042] Step S3: Determine the current control strategy based on the mapping relationship and the current PTC operating scenario of the fuel cell system.

[0043] In this embodiment of the application, step S3 specifically includes: Step S31: If the current PTC operating scenario of the fuel cell system is low temperature cold start, then confirm that the first control strategy is the current control strategy.

[0044] Specifically, when the working scenario is a cold start at low temperature, it means that the electrical components are most vulnerable at this time. Therefore, the first control strategy is to distribute the current peak through time difference to ensure the safety of the overall system.

[0045] Step S32: If the current PTC operating scenario of the fuel cell system is rapid warm-up, then confirm that the second control strategy is the current control strategy.

[0046] Specifically, when the working scenario is rapid warm-up, it means that rapid heating is required and the power of a single heat source is insufficient. Therefore, a second control strategy is mapped to reach the optimal working temperature in the shortest time.

[0047] Step S33: If the current PTC operating scenario of the fuel cell system is high-voltage discharge, then confirm that the third control strategy is the current control strategy.

[0048] Specifically, when the working scenario is high-voltage discharge, it means that there is a risk of electric shock. Therefore, the third control strategy is mapped to reuse the first PTC as a resistive load to actively consume electrical energy and eliminate the hidden danger.

[0049] Steps S31 to S33 are parallel determination steps, and the step numbers do not represent the order in which the current control strategy is determined.

[0050] In this embodiment of the application, after step S31, the following steps are also included: When the first relay used to control the on / off state of the first PTC is closed and the second relay used to control the on / off state of the second PTC is open, or when the second relay is closed and the first relay remains closed, if the increase in total PTC power consumption within a preset time is less than a preset value and continues for a preset time, it is determined that the corresponding PTC has an open circuit fault.

[0051] Specifically, the total PTC power consumption = DC-DC input power - DC output power - air compressor power consumption - hydrogen pump power consumption - water pump power consumption. The preset value can be 5kW, and the preset time can be 3 seconds. When a relay closes, theoretically the circuit is turned on, and the total power consumption should increase significantly. If the actual increase in power consumption is less than the preset value within the preset time, it means that the current has not flowed through that branch, but the relay is closed, which indicates that an internal open circuit fault has occurred in the PTC itself.

[0052] If the reduction in total PTC power consumption within a preset time is less than a preset value and continues for a preset time when the first relay is disconnected and the second relay remains closed, or when the second relay is disconnected and the first relay remains closed, then the corresponding relay is determined to have a sticking fault.

[0053] Specifically, when a relay is disconnected, theoretically the branch is cut off and the total power consumption should be significantly reduced. If the actual power consumption reduction is less than the preset value within the preset time, it means that the current is still flowing through the branch. The controller has issued a disconnect command, so it is determined that the relay contacts are physically stuck and have failed to disconnect.

[0054] When both the first and second relays are in the off state, if the absolute value of the total PTC power consumption is greater than the preset value and continues for a preset time, it is determined that at least one PTC power is abnormally faulty.

[0055] Specifically, when all relays are disconnected, the PTC circuit should theoretically be completely cut off, and the total power consumption should be zero. If the absolute value of the total PTC power consumption is greater than the preset value and continues for a preset time, it indicates that there is an unexpected current path, and it is determined to be at least one PTC power abnormality fault.

[0056] Furthermore, if the PTC outlet temperature deviates from the coolant inlet temperature by more than 0.7 times the maximum pump speed when the pump speed is greater than 0.7 times the maximum pump speed, a temperature reliability fault will be reported.

[0057] The embodiments of this application, through the above-described PTC fault diagnosis method, monitor PTC power consumption and temperature in real time, and can promptly detect open circuits, relay sticking, and temperature reliability faults, thereby improving system reliability and maintainability, reducing fault diagnosis time, and lowering maintenance costs.

[0058] In this embodiment of the application, after step S33, the method further includes: monitoring the air compressor voltage, and controlling the first PTC to disconnect when the air compressor voltage is less than a preset voltage threshold or the time for using the third control strategy exceeds a preset discharge time.

[0059] Specifically, the purpose of high-voltage discharge is to reduce the residual voltage to a safe range. By monitoring the air compressor voltage in real time, when the voltage drops below a preset voltage threshold, it indicates that the discharge target has been achieved and the system has entered a safe state, thus stopping the discharge. In this embodiment, the preset discharge time can be 5 seconds.

[0060] This application embodiment establishes a mapping relationship between PTC operating scenarios and preset control strategies, and combines the collection of multi-dimensional parameters such as thermal management, electrical, and system status to determine the current scenario. This achieves adaptive control for different operating conditions, avoiding the problem that a single fixed control logic cannot accommodate multiple operational needs, and improving the flexibility and accuracy of system control. This application embodiment also comprehensively improves the thermal management performance, operational reliability, and safety of the fuel cell system by specifically controlling at least one of the following: PTC load connection status, PTC switching timing, and DC-DC operating mode.

[0061] Secondly, embodiments of this application also provide a PTC control device for a fuel cell system.

[0062] In one embodiment, reference is made to Figure 3 , Figure 3 This is a functional module diagram of the PTC control device for a fuel cell system provided in an embodiment of this application. Figure 3 As shown, the PTC control device for the fuel cell system includes: A module is established to create a mapping relationship between the PTC operating scenarios of the fuel cell system and the preset control strategies; The data acquisition module is used to collect thermal management parameters, electrical parameters, and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system. The determination module is used to determine the current control strategy based on the mapping relationship and the current PTC operating scenario of the fuel cell system. The preset control strategy is a strategy that controls at least one of the following: the PTC load connection status, the switching sequence of multiple PTCs, or the DC-DC operating mode.

[0063] The functions of each module in the above-mentioned fuel cell system PTC control device correspond to the steps in the above-mentioned fuel cell system PTC control method embodiment, and their functions and implementation processes will not be described in detail here.

[0064] Thirdly, embodiments of this application provide a fuel cell system PTC control device, which includes a processor, a memory, and a fuel cell system PTC control program stored in the memory and executable by the processor. When the fuel cell system PTC control program is executed by the processor, it implements the steps of the fuel cell system PTC control method as described in any of the above embodiments.

[0065] The fuel cell system PTC control device provided in this application embodiment can be a personal computer (PC), laptop computer, server, or other device with data processing capabilities.

[0066] In this embodiment of the application, the PTC control device of the fuel cell system may include a processor, a memory, a communication interface, and a communication bus.

[0067] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0068] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting devices within the fuel cell system's PTC control equipment, as well as interfaces used for interconnecting the fuel cell system's PTC control equipment with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0069] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0070] The processor can be a general-purpose processor, which can call the fuel cell system PTC control program stored in the memory and execute the fuel cell system PTC control method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the fuel cell system PTC control program is called can be referred to in the various embodiments of the fuel cell system PTC control method of this application, and will not be repeated here.

[0071] Fourthly, embodiments of this application provide a computer-readable storage medium storing a fuel cell system PTC control program, wherein when the fuel cell system PTC control program is executed by a processor, it implements the steps of the fuel cell system PTC control method as described in any of the above embodiments.

[0072] The present application has a computer-readable storage medium storing a fuel cell system PTC control program, wherein when the fuel cell system PTC control program is executed by a processor, it implements the steps of the fuel cell system PTC control method described above.

[0073] The method implemented when the fuel cell system PTC control program is executed can be referred to in various embodiments of the fuel cell system PTC control method of this application, and will not be repeated here.

[0074] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0075] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0076] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0077] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0078] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0079] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0080] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A PTC control method for a fuel cell system, characterized in that, The PTC control method for the fuel cell system includes: Establish a mapping relationship between the PTC operating scenarios and preset control strategies of the fuel cell system; Collect thermal management parameters, electrical parameters, and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system; Based on the mapping relationship and the current PTC operating scenario of the fuel cell system, the current control strategy is determined; The preset control strategy is a strategy that controls at least one of the following: the PTC load connection status, the PTC switching timing, or the DC-DC operating mode.

2. The PTC control method for a fuel cell system according to claim 1, characterized in that: The preset control strategy includes a first control strategy, a second control strategy, and a third control strategy; The first control strategy is used to control the first PTC and the second PTC in the fuel cell system to turn on or off sequentially at a preset time interval; The second control strategy is used to control the DCDC to switch its operating mode from normal power supply mode to constant voltage mode, and to control the DCDC to operate with high current and low voltage and turn on the first PTC; The third control strategy is used to control the first PTC to be connected to the high-voltage circuit of the fuel cell system as an energy-consuming load, and to turn on the first PTC.

3. The PTC control method for a fuel cell system according to claim 2, characterized in that: The thermal management parameters include: coolant inlet temperature and first PTC outlet temperature; The electrical parameters include: system power, air compressor voltage, and bus voltage; The system status parameters include: startup status, running status, and shutdown status.

4. The PTC control method for a fuel cell system according to claim 3, characterized in that, The process of collecting thermal management parameters, electrical parameters, and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system includes: Collect thermal management parameters, electrical parameters, and system status parameters of the fuel cell system, and determine the current PTC operating scenario of the fuel cell system based on the collected thermal management parameters, electrical parameters, and system status parameters: If the system status parameters are in the start-up state, and the first PTC outlet temperature and coolant inlet temperature are both lower than the preset temperature threshold, the current PTC operating scenario of the fuel cell system is determined to be low-temperature cold start. If the system status parameters are in the running state, and the system power is at idle power and the coolant inlet temperature is lower than the preset warm-up threshold, the current PTC working scenario of the fuel cell system is determined to be rapid warm-up; If the system status parameter is in the off state, and the air compressor voltage or bus voltage is higher than the preset voltage threshold, the current PTC working scenario of the fuel cell system is determined to be high-pressure discharge.

5. The PTC control method for a fuel cell system according to claim 4, characterized in that, The step of determining the current control strategy based on the mapping relationship and the current PTC operating scenario of the fuel cell system includes: If the current PTC operating scenario of the fuel cell system is low temperature cold start, then the first control strategy is confirmed as the current control strategy; If the current PTC operating scenario of the fuel cell system is rapid warm-up, then the second control strategy is confirmed as the current control strategy; If the current PTC operating scenario of the fuel cell system is high-voltage discharge, then the third control strategy is confirmed as the current control strategy.

6. The PTC control method for a fuel cell system according to claim 5, characterized in that, After confirming that the first control strategy is the current control strategy if the current PTC operating scenario of the fuel cell system is low-temperature cold start, the method further includes: When the first relay used to control the on / off state of the first PTC is closed and the second relay used to control the on / off state of the second PTC is open, or when the second relay is closed and the first relay remains closed, if the increase in total PTC power consumption within a preset time is less than a preset value and continues for a preset time, it is determined that the corresponding PTC has an open circuit fault. When the first relay is disconnected and the second relay remains closed, or when the second relay is disconnected and the first relay remains closed, if the reduction in total PTC power consumption within a preset time is less than a preset value and continues for a preset time, it is determined that the corresponding relay has a sticking fault. When both the first and second relays are in the off state, if the absolute value of the total PTC power consumption is greater than the preset value and continues for a preset time, it is determined that at least one PTC power is abnormally faulty.

7. The PTC control method for a fuel cell system according to claim 5, characterized in that, After confirming that the third control strategy is the current control strategy if the current PTC operating scenario of the fuel cell system is high-voltage discharge, the method further includes: Monitor the air compressor voltage. When the air compressor voltage is less than the preset voltage threshold or the time for using the third control strategy exceeds the preset discharge time, control the first PTC to disconnect.

8. A PTC control device for a fuel cell system, characterized in that, The fuel cell system PTC control device includes: A module is established to create a mapping relationship between the PTC operating scenarios of the fuel cell system and the preset control strategies; The data acquisition module is used to collect thermal management parameters, electrical parameters, and system status parameters of the fuel cell system to determine the current PTC operating scenario of the fuel cell system. The determination module is used to determine the current control strategy based on the mapping relationship and the current PTC operating scenario of the fuel cell system. The preset control strategy is a strategy that controls at least one of the following: the PTC load connection status, the PTC switching timing, or the DC-DC operating mode.

9. A PTC control device for a fuel cell system, characterized in that, The fuel cell system PTC control device includes a processor, a memory, and a fuel cell system PTC control program stored in the memory and executable by the processor, wherein when the fuel cell system PTC control program is executed by the processor, it implements the steps of the fuel cell system PTC control method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a fuel cell system PTC control program, wherein when the fuel cell system PTC control program is executed by a processor, it implements the steps of the fuel cell system PTC control method as described in any one of claims 1 to 7.

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