Fuel cell start-stop stack control method, device, equipment and storage medium for hydrogen fuel cell vehicles

Abstract

The present application discloses a fuel cell start-stop stack control method, device, equipment, and storage medium for a hydrogen fuel cell vehicle, relating to the field of vehicle battery management technology. The method includes: controlling the vehicle's high-voltage power-on and detecting whether the fuel cell meets the start-up conditions; upon detecting that the fuel cell meets the start-up conditions, receiving the stack operating status sent by the fuel cell control unit; starting the fuel cell stack based on the stack operating status and detecting whether the fuel cell meets the shutdown conditions; upon detecting that the fuel cell meets the shutdown conditions, receiving the high-voltage power-off permission status sent by the fuel cell control unit; and shutting down the fuel cell stack based on the shutdown conditions and the high-voltage power-off permission status. By real-time monitoring and responding to the vehicle's high-voltage power-on status, the stack operating status, and status signals sent by the fuel cell control unit, the reliability and service life of the fuel cell system are effectively improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle battery management technology, and in particular to a fuel cell start-stop stack control method, device, equipment, and storage medium for hydrogen fuel vehicles. Background Art

[0002] With the continuous development of the economy, energy security issues have become particularly important. Currently, the starting and stopping of hydrogen fuel cell vehicles are basically controlled based on the battery state of charge (SOC) of the power battery being lower than a certain value, such as 70%, or higher than a certain value, such as 80%. There is no strategy developed based on the current actual maximum energy recovery power available from the power battery, the operating status of the fuel cell system, and the status of the vehicle's drive system.

[0003] However, the power battery's SOC value will deviate over time, requiring correction at a charging station. Fuel cell vehicles convert chemical energy into electrical energy through a chemical reaction between hydrogen and oxygen in the fuel cell system's stack, driven by a catalyst. In actual operation, most vehicles only refuel at hydrogen refueling stations, never at charging stations. As time goes by, the SOC deviation increases, failing to accurately reflect the power battery's current charging capacity.

[0004] The above content is only used to assist in understanding the technical solution of this application and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of this application is to provide a fuel cell start-stop stack control method, device, equipment and storage medium for a hydrogen fuel cell vehicle, aiming to solve the technical problems of inaccuracy and unsafety caused by the start-stop control strategy of hydrogen fuel cell vehicles relying solely on the SOC value of the power battery.

[0006] To achieve the above objectives, the present application proposes a method for controlling the start-stop stack of a fuel cell in a hydrogen fuel vehicle, the method comprising:

[0007] Control the vehicle's high voltage power supply and detect whether the fuel cell meets the stacking conditions;

[0008] When it is detected that the fuel cell meets the stack starting condition, receiving the stack operation status sent by the fuel cell control unit;

[0009] Starting up the fuel cell stack according to the stack operation status, and detecting whether the fuel cell stack meets the shutdown condition;

[0010] When it is detected that the fuel cell meets the shutdown condition, receiving the high voltage power-off permission state sent by the fuel cell control unit;

[0011] The fuel cell is shut down according to the shutdown condition and the high voltage power-off permission state.

[0012] In one embodiment, the steps of controlling the vehicle high voltage power-up and detecting whether the fuel cell meets the stacking conditions include:

[0013] Control vehicle high voltage power-up;

[0014] Obtain the vehicle's electric vehicle mode switch status, battery state of charge, preset state of charge, fuel cell control unit communication status, and battery management system charging power and preset charging power;

[0015] When the switch state is an invalid state, the battery state of charge is less than the preset state of charge, the communication state is a preset communication state, and the charging power is greater than a preset charging power, it is determined that the fuel cell meets the stacking condition.

[0016] In one embodiment, the step of starting up the fuel cell stack according to the operating state of the fuel cell stack includes:

[0017] When the stack operating state is the first operating state, the second operating state, and the third operating state, sending a stack start instruction to the fuel cell control unit so that the fuel cell control unit feeds back the new stack operating state and records the time when the instruction is sent;

[0018] Obtaining the instruction sending time period according to the instruction sending time;

[0019] When the instruction sending time period is less than the preset sending time period and the new stack operating state is the second operating state or the fourth operating state, a stack start instruction is sent to the fuel cell control unit so that the fuel cell control unit starts the fuel cell stack according to the stack start instruction.

[0020] In one embodiment, the step of detecting whether the fuel cell meets the shutdown condition includes:

[0021] Obtain the vehicle's electric vehicle mode switch status, battery state of charge, preset state of charge, fuel cell control unit communication status, communication state retention time, and battery management system charging power and preset charging power;

[0022] When the vehicle is in a non-high-voltage power-on state, the switch state is in a valid state, the battery state of charge is greater than or equal to the preset state of charge, the charging power is less than the preset charging power, the communication state is a preset communication state and the communication state is maintained for a time greater than the preset communication time, and the stack operating state is not at least one of the second operating state, the third operating state, and the fourth operating state, it is determined that the fuel cell meets the shutdown conditions.

[0023] In one embodiment, the step of shutting down the fuel cell according to the shutdown condition and the high voltage power-off permission state includes:

[0024] When the shutdown condition is that the communication state is a preset communication state and the communication state is maintained for longer than the preset communication time, a shutdown instruction is sent to the fuel cell control unit according to the high-voltage power-off permission state, so that the fuel cell control unit controls the vehicle to power off the high voltage according to the shutdown instruction and completes the shutdown operation.

[0025] In one embodiment, the step of shutting down the fuel cell according to the shutdown condition and the high voltage power-off permission state further includes:

[0026] When the shutdown condition is that the vehicle is in a non-high-voltage powered state, obtaining a high-voltage powered-off state of the vehicle;

[0027] According to the high-voltage power-off permission state, a preset high-voltage permission state reception time is obtained;

[0028] The fuel cell stack is shut down according to the high-voltage power-off state and the preset high-voltage permission state reception time.

[0029] In one embodiment, the step of shutting down the fuel cell stack according to the high-voltage power-off state and the high-voltage enabling state receiving time includes:

[0030] Obtaining a first preset receiving time and a second preset receiving time, wherein the first preset receiving time is less than the second preset receiving time;

[0031] When the high-voltage power-off state is non-high-voltage power-off and the preset high-voltage permission state reception time is greater than the first preset reception time, sending a shutdown instruction to the fuel cell control unit, so that the fuel cell control unit completes the fuel cell shutdown according to the shutdown instruction;

[0032] When the high-voltage power-off state is high-voltage power-off and the preset high-voltage permission state reception time is greater than the second preset reception time, the high-voltage circuit between the fuel cell and the vehicle is cut off to complete the fuel cell shutdown.

[0033] In addition, to achieve the above-mentioned purpose, the present application also proposes a fuel cell start-stop stack control device for a hydrogen fuel vehicle, the fuel cell start-stop stack control device for a hydrogen fuel vehicle comprising: a power-on module for controlling the vehicle high voltage power-on and detecting whether the fuel cell meets the stack start-up conditions;

[0034] A receiving module, configured to receive a stack operation status sent by a fuel cell control unit when detecting that the fuel cell meets a stack start-up condition;

[0035] A stacking module, configured to stack the fuel cell according to the operating state of the fuel cell stack and detect whether the fuel cell stack meets the shutdown condition;

[0036] The receiving module is further configured to receive a high voltage power-off permission status sent by the fuel cell control unit when it is detected that the fuel cell meets a shutdown condition;

[0037] A shutdown module is used to shut down the fuel cell according to the shutdown condition and the high-voltage power-off permission state.

[0038] In addition, to achieve the above-mentioned purpose, the present application also proposes a fuel cell start-stop stack control device for a hydrogen fuel vehicle, the device comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the fuel cell start-stop stack control method for a hydrogen fuel vehicle as described above.

[0039] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the fuel cell start-stop stack control method for a hydrogen fuel vehicle as described above are implemented.

[0040] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the steps of the fuel cell start-stop stack control method for a hydrogen fuel vehicle as described above.

[0041] One or more technical solutions proposed in this application have at least the following technical effects:

[0042] By controlling the vehicle's high-voltage power-up and detecting whether the fuel cell meets the startup conditions; upon detecting that the fuel cell meets the startup conditions, receiving the stack operating status from the fuel cell control unit; starting the fuel cell according to the stack operating status and detecting whether the fuel cell meets the shutdown conditions; upon detecting that the fuel cell meets the shutdown conditions, receiving the high-voltage power-off permission status from the fuel cell control unit; and shutting down the fuel cell according to the shutdown conditions and the high-voltage power-off permission status, this technology overcomes the limitations of relying solely on the power battery SOC value for start-stop control, avoiding the problems of power battery overcharging and frequent fuel cell system starts and stops due to SOC deviations. This achieves more accurate and reliable fuel cell system start-stop control, extends the fuel cell system's service life and the vehicle's energy management efficiency, thereby enhancing the operational safety and economic efficiency of hydrogen fuel cell vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0045] Figure 1 A flow chart of a first embodiment of a method for controlling a fuel cell start-stop stack of a hydrogen fuel vehicle according to the present invention;

[0046] Figure 2 A schematic diagram of a stacking process for controlling a fuel cell start-stop stack of a hydrogen fuel vehicle according to the present invention;

[0047] Figure 3 A flow chart illustrating a second embodiment of a method for controlling a fuel cell start-stop stack of a hydrogen fuel vehicle according to the present application;

[0048] Figure 4 A schematic diagram of a fuel cell shutdown process provided in Example 2 of the fuel cell start-stop control method for a hydrogen fuel vehicle of the present application;

[0049] Figure 5 This is a schematic diagram of the module structure of the fuel cell start-stop stack control device of the hydrogen fuel vehicle according to the embodiment of the present application;

[0050] Figure 6 This is a schematic diagram of the device structure of the hardware operating environment involved in the fuel cell start-stop stack control method for a hydrogen fuel vehicle in an embodiment of the present application.

[0051] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] It should be understood that the specific embodiments described herein are merely used to explain the technical solutions of the present application and are not intended to limit the present application.

[0053] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0054] The main solution of the embodiment of the present application is: controlling the vehicle high voltage power-on and detecting whether the fuel cell meets the stack starting conditions; when it is detected that the fuel cell meets the stack starting conditions, receiving the stack operation status sent by the fuel cell control unit; starting the fuel cell according to the stack operation status, and detecting whether the fuel cell meets the stack shutdown conditions; when it is detected that the fuel cell meets the stack shutdown conditions, receiving the high voltage power-off permission status sent by the fuel cell control unit; shutting down the fuel cell according to the stack shutdown conditions and the high voltage power-off permission status.

[0055] In this embodiment, for ease of description, the vehicle controller is used as the execution entity for explanation below.

[0056] Because existing hydrogen fuel cell vehicle start-stop control strategies rely solely on the power battery SOC value, resulting in inaccuracies and insecurity, the present application provides a solution. By controlling the vehicle's high-voltage power-up and detecting whether the fuel cell meets the start-up conditions; upon detecting that the fuel cell meets the start-up conditions, receiving the stack operating status sent by the fuel cell control unit; starting the fuel cell stack based on the stack operating status and detecting whether the fuel cell meets the shutdown conditions; upon detecting that the fuel cell meets the shutdown conditions, receiving the high-voltage power-off permission status sent by the fuel cell control unit; and shutting down the fuel cell stack based on the shutdown conditions and the high-voltage power-off permission status, the present application addresses the limitations of relying solely on the power battery SOC value for start-stop control, avoiding the problems of power battery overcharging and frequent start-stopping of the fuel cell system due to SOC deviation. This solution achieves more accurate and reliable fuel cell system start-stop control, improves the service life of the fuel cell system and the energy management efficiency of the entire vehicle, thereby enhancing the operational safety and economic efficiency of hydrogen fuel cell vehicles.

[0057] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, mobile phone, etc., or an electronic device capable of performing the above functions, a fuel cell start-stop stack control device for a hydrogen fuel cell vehicle, and a vehicle controller. The following uses the vehicle controller as an example to illustrate this embodiment and the following embodiments.

[0058] Based on this, the embodiment of the present application provides a method for controlling the start and stop stack of a fuel cell of a hydrogen fuel vehicle, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the fuel cell start-stop stack control method for a hydrogen fuel vehicle of the present application.

[0059] In this embodiment, the fuel cell start-stop stack control method for a fuel vehicle includes steps S10 to S50:

[0060] Step S10, controlling the vehicle high voltage to be powered on, and detecting whether the fuel cell meets the stacking conditions;

[0061] It should be noted that a fuel cell is a device that directly converts the chemical energy of hydrogen and oxygen into electrical energy, generating electricity through an electrochemical reaction. It is commonly used in hydrogen fuel cell vehicles as a power source. The startup conditions refer to a series of pre-defined conditions that must be met for the fuel cell system to start. These conditions include, but are not limited to, fuel cell system pressure, temperature, hydrogen and oxygen supply conditions, and system fault conditions.

[0062] It can be understood that controlling the vehicle's high-voltage power supply refers to issuing a command through the vehicle's control unit to connect the vehicle's high-voltage power supply system, allowing the vehicle's high-voltage battery to begin supplying power to the vehicle's electrical system. High-voltage power supply is fundamental to the operation of electric vehicles and their high-voltage systems, ensuring the proper functioning of the vehicle's electrical equipment.

[0063] In a feasible implementation, step S10 may include steps S11 to S13:

[0064] Step S11, controlling the vehicle to be powered on at high voltage;

[0065] It is understood that the steps for controlling the high-voltage power-on of the vehicle may be as follows: after detecting that the vehicle key is powered on, the fuel cell control unit (FCU) and the hydrogen management system (HMS) are awakened through the low-voltage relay. After the FCU and HMS are turned on, the FCU can receive instructions from the vehicle control unit (VCU). Then, the main negative relay, the main positive relay, and the auxiliary drive relay are closed to complete the high-voltage power-on of the vehicle.

[0066] The low-voltage wake-up source of FCU and HMS is controlled by VCU, which delays power-off to avoid direct low-voltage power cut-off of FCU and HMS before completing the required work before shutdown, such as purge, after the key is turned off.

[0067] Step S12, obtaining the switch state of the vehicle electric vehicle mode, the battery state of charge, the preset state of charge, the communication state of the fuel cell control unit, and the charging power and preset charging power of the battery management system;

[0068] It should be noted that the electric vehicle mode switch status refers to the current state of the EV (electric vehicle) mode switch in the vehicle's cab. The battery state of charge (SOC) represents the percentage of the battery's current remaining charge and is a key parameter monitored by the battery management system (BMS). The preset SOC is a pre-set SOC value in the control strategy that serves as the basis for fuel cell system activation. For example, if the preset SOC falls below a certain value (such as 80%), the fuel cell system may be activated to replenish the battery. The fuel cell control unit communication status refers to the communication status between the fuel cell control unit (FCU) and the vehicle controller (VCU). Proper communication status is crucial to ensure that the fuel cell system can receive commands from the VCU. The battery management system charging power is the current charging power allowed by the battery management system and is provided by the BMS. The preset charging power is a pre-set charging power value in the control strategy that is used for comparison with the charging power.

[0069] Step S13, determining that the fuel cell meets the stacking condition when the switch state is in an invalid state, the battery state of charge is less than the preset state of charge, the communication state is a preset communication state, and the charging power is greater than a preset charging power.

[0070] It is understood that after step S11, it can be determined that the vehicle is in a pure electric high-voltage power-on state. If the switch state is invalid, it is necessary to determine whether the EV switch is invalid, that is, the vehicle needs to enter the combustion-electric mode.

[0071] The battery state of charge (SOC) is determined to be less than a preset SOC. In this embodiment, the preset SOC is 80%. When the battery SOC reaches 80%, the fuel cell system is shut down, i.e., the fuel cell stops generating power, to avoid overcharging. When the battery SOC drops from 80% to 70%, the fuel cell system is restarted to replenish the battery.

[0072] In this embodiment, the preset communication state is a non-communication timeout state. Therefore, the communication state being the preset communication state indicates that normal communication between the VCU and the FCU is ensured so as to correctly transmit control signals.

[0073] The charging power is greater than the preset charging power, which means that if the charging power of the battery is greater than the preset value, it means that the battery can accept more charging. The charging power allowed by the BMS can be expressed as: BMS allowed charging power = BMS available energy feedback power - motor energy feedback power. The preset charging power is set according to the power level of the power battery, the battery at a certain temperature such as 10°C, and the battery soc at a certain value such as 90%. In this embodiment, the specific value of the preset charging power is not limited. The strategy here is to solve the problem of SOC deviation caused by the vehicle not being charged at the charging pile for a long time. When this condition is not met, the stacking is not allowed to avoid the battery available energy feedback power being lower than the minimum net output power allowed by the fuel cell, causing overcharging, and the combustion control battery system stopping the stack immediately after starting the stack. The number of starts of the fuel cell system is limited, and frequent starts and stops will reduce reliability and service life.

[0074] It's important to note that regenerative power refers to the amount of power a battery can receive during the regenerative process. When a vehicle decelerates or brakes, the vehicle's kinetic energy is converted into electrical energy by the motor and then stored back in the battery. The BMS's available regenerative power specifically refers to the maximum power a battery can accept in its current state without exceeding its charge limits or causing overheating. The BMS assesses this power based on the battery's current temperature, SOC, and other parameters.

[0075] When a vehicle decelerates or brakes, the motor converts the vehicle's kinetic energy into electrical energy. This process is called regenerative braking. Motor regenerative power refers to the electrical power generated by the motor during this regenerative braking process. This power depends on the vehicle's deceleration rate, the motor's efficiency, and the current state of the battery.

[0076] Step S20, when it is detected that the fuel cell meets the stacking conditions, receiving the stack operation status sent by the fuel cell control unit;

[0077] It should be noted that the stack operating status indicates the operating status of the stack system, which includes but is not limited to the ready state (ready), starting state, power-on self-test state and operating state. The ready state indicates that the stack is in a ready state, has completed self-test, and the stack is ready to receive the start-up command. The starting state indicates that the stack is in the process of starting up and may be heating to the operating temperature, building pressure, or executing other startup procedures. This stage is a transitional state, indicating that the stack has not yet been fully started but is in progress. The power-on self-test state indicates that the stack is performing a self-check before starting. This stage may include checking electrical connections, fluid lines, sensor readings, etc. to ensure that all components are in normal condition and ready for the next startup. The operating state indicates that the stack is currently in normal operating state and is generating electrical energy. This is the state after the stack has been successfully started, which means that the stack has completed the startup process and all system parameters are within the normal operating range.

[0078] It is understood that when the fuel cell system detects that it meets the stacking conditions, it sends a stack start command to the FCU, which coordinates the various controllers in the fuel cell system to complete the stacking process. However, if the fuel cell system does not meet the stacking conditions, the VCU sends a stack shutdown command to the FCU, returning to the detection step to repeatedly check whether the stacking conditions are met.

[0079] Step S30, starting up the fuel cell stack according to the stack operation state, and detecting whether the fuel cell stack meets the shutdown condition;

[0080] It is understood that starting the fuel cell stack according to the stack operating status means that the VCU receives the stack system operating status (FCU_Sts) from the FCU in real time, and determines whether the stack is successful based on the FCU_Sts. If successful, the vehicle enters the fuel cell power mode. FCU_Sts = 0 indicates the ready state (ready), FCU_Sts = 1 indicates the starting state, FCU_Sts = 7 indicates the power-on self-test state, and FCU_Sts = 2 indicates the running state.

[0081] In addition, it can be understood that detecting whether the fuel cell meets the shutdown condition means that during and after the stacking process, whether the fuel cell meets the shutdown condition can be detected in real time, and the stack can be shut down in time.

[0082] In a feasible implementation, step S30 may include steps A31 to A33:

[0083] Step A31: When the stack operating state is the first operating state, the second operating state, or the third operating state, sending a stack start instruction to the fuel cell control unit so that the fuel cell control unit feeds back the new stack operating state, and recording the time when the instruction was sent;

[0084] It should be noted that the first operating state, the second operating state and the third operating state represent a ready state, a starting state and a power-on self-test state respectively.

[0085] It is understood that sending a stack startup instruction to the fuel cell control unit means that when the VCU receives any of the above-mentioned status feedback from the FCU, it will send a stack startup instruction to the FCU to try to start the stack into operation again. After receiving the stack startup instruction, the FCU will restart or continue to start the stack and feedback the new operating status to the VCU so that the VCU can understand whether the stack has been successfully started.

[0086] In addition, it can be understood that recording the instruction sending time means that the VCU records the time when the stacking instruction is sent. This time point is used for subsequent monitoring and diagnosis. In particular, if the expected operating status update is not received within the predetermined time, the VCU may need to take further measures.

[0087] Step A32, obtaining the instruction sending time period according to the instruction sending time;

[0088] It should be noted that the instruction sending time period refers to the time period from the sending of the stack starting instruction to the return of the fuel cell control unit to a specific operating state, such as a stable operating state.

[0089] It is understandable that when the VCU sends a stacking instruction to the FCU, it records the time when the instruction was sent. This can be achieved through a timestamp, which marks the specific date and time when the instruction was sent. By comparing the current time with the instruction sending time, the VCU calculates the time period after the instruction was sent. This time period is used to evaluate whether the stack startup process is within the normal time range. If the difference between the current time and the instruction sending time (i.e., the time period) exceeds the preset time period, but the stack still does not reach the expected operating state, the VCU may determine that the stacking has failed or is delayed, and take corresponding measures, such as reissuing the instruction, sending a fault diagnosis instruction, or recording fault information.

[0090] Step A33, when the instruction sending time period is less than the preset sending time period and the new stack operating state is the second operating state or the fourth operating state, send a stack start instruction to the fuel cell control unit so that the fuel cell control unit starts the fuel cell stack according to the stack start instruction.

[0091] It should be noted that the preset sending time period is a time period preset based on the startup characteristics of the fuel cell stack and is used to evaluate whether the fuel cell stack responds to the startup instruction within a reasonable time. In this embodiment, the preset sending time period is 60 seconds.

[0092] It can be understood that the instruction sending time period being less than the preset sending time period means that the VCU will compare the instruction sending time period with the preset sending time period to determine whether the fuel cell stack responds to the stacking instruction within a reasonable time.

[0093] Furthermore, it is understood that if a new stack operating status is received within the preset transmission time period, and the new stack operating status is either starting or running, the VCU will continue to send a stack start command to the FCU, indicating successful stack startup. If this condition is not met, the VCU will send a stack shutdown command to the FCU, entering the shutdown process, and the stack startup process will end if the startup fails.

[0094] Reference Figure 2 , Figure 2This is a schematic diagram of the stacking process of the first embodiment of the fuel cell start-stop stack control method for hydrogen fuel vehicles of this application, as shown in FIG. Figure 2 As shown:

[0095] After the key is turned on, the VCU wakes up and executes the high-voltage power-up procedure for pure electric driving. The VCU wakes up the FCU and HMIs via a low-voltage relay. The FCU wakes up and performs pre-stack preparations. The FCU receives the stack control status command (VCU_cmdFCu) from the VCU. Once the FCU is started, it can send the FCU operating status message (FCU_RuSts) with ID 0x18FFA1D1 and the stack system operating status (FCU_Sts). When the main negative relay, main positive relay, and auxiliary drive relay are closed, the vehicle is ready for driving. If none of these relays are closed, the VCU wakes up again and the high-voltage power-up procedure for pure electric driving is executed. When the vehicle is ready for driving, that is, VCU_ReadyStatus equals 1, the high-voltage power-up for pure electric driving is complete. The VCU enters fuel-electric management mode when the SOC is less than 80%, the EV switch is disabled, FCU communication is not exceeded, and the BMS's allowed charging power is greater than the set value. Send VCU_cmdFCU=0 to shut down the fuel cell stack and initialize the VCU demand power, that is, VCU_DemandPower=the minimum net output power allowed by the fuel cell. When fcuSts is equal to 2, the VCU stacking is completed and VCU_cmdFCU=1 is sent to start the fuel cell stack. And the required power of the whole vehicle is assigned. At this time, the stacking is completed and the fuel-electricity mode is entered. When fcuSts is equal to 0 or equal to 1 or equal to 7, send VCU_cmdFCU=1 to start the fuel cell stack. If the instruction that fcuSts is equal to 2 is received within 60 seconds, the VCU stacking is completed. When fcuSts is not equal to 0 and not equal to 1 and not equal to 2 and not equal to 7, the stacking is completed and the VCU controls the shutdown of the fuel cell stack. And send VCU_cmdFCU=0 to shut down the fuel cell stack and assign VCU_DemandPower=0.

[0096] In a feasible implementation, step S30 may further include steps B31 to B32:

[0097] Step B31, obtaining the vehicle's electric vehicle mode switch state, battery state of charge, preset state of charge, fuel cell control unit communication state, communication state retention time, and battery management system charging power and preset charging power;

[0098] It should be noted that the communication status duration refers to how long the communication status between the FCU and VCU lasts. If the communication timeout or lasts for too long, it may indicate a system problem.

[0099] Step B32, when the vehicle is in a non-high-voltage power-on state, the switch state is in a valid state, the battery state of charge is greater than or equal to the preset state of charge, the charging power is less than the preset charging power, the communication state is the preset communication state and the communication state is maintained for a time greater than the preset communication time, and the stack operating state is not at least one of the second operating state, the third operating state, and the fourth operating state, determines that the fuel cell meets the shutdown conditions.

[0100] It should be noted that the preset communication time refers to the duration of the good communication state between the FCU and the VCU (not a communication timeout). In this embodiment, the preset communication time is 60 seconds.

[0101] It is understood that the vehicle's non-high-voltage power-on state indicates that the vehicle's high-voltage system is not active, meaning the vehicle may be parked or not ready to drive. The active switch state indicates that the EV switch is active, meaning the vehicle needs to enter pure electric mode. A charging power less than the preset charging power indicates that the battery SOC is ≥ 80%.

[0102] A charging power lower than the preset charging power indicates the BMS's permitted charging power, i.e., BMS available energy regeneration power minus motor energy regeneration power less than the fuel cell's minimum net output power. This strategy addresses the issue of SOC deviation caused by a vehicle's prolonged absence from a charging station. When the battery SOC remains below 80%, but the actual available energy regeneration power falls below the fuel cell's minimum net output power, the VCU (Velectronic Control Unit) must prematurely shut down the fuel cell system to prevent the power battery from overcharging and potentially causing a serious fault, which could lead to unnecessary vehicle high-voltage reduction. The VCU's demanded power (VCU_DemandPower) is calculated based on the BMS's available charging power and the power requirements of the vehicle's drive system and high-voltage accessories. The FCU receives the VCU's power request and executes it accordingly.

[0103] If the communication status is set to the preset communication status, it indicates that the communication between the fuel cell control unit (FCU) and the vehicle control unit (VCU) is in the preset state, indicating that the communication system is normal. If the communication status is maintained for longer than the preset communication time, it indicates that the communication between the VCU and the FCU is continuous and normal during this period of 60 seconds or longer.

[0104] The stack operating state is not the second operating state, the third operating state, and the fourth operating state. The stack operating state is not the starting state, the power-on self-test state, and the operating state.

[0105] It can be understood that if at least one of the above conditions is met, it is determined that the fuel cell meets the shutdown condition, that is, the fuel cell can be safely stopped.

[0106] Step S40, when it is detected that the fuel cell meets the shutdown condition, receiving the high voltage power-off permission state sent by the fuel cell control unit;

[0107] It should be noted that the high-voltage power-off permission state (FCU_HVShutdownAllow) is a signal sent by the FCU to indicate whether the system is allowed to disconnect the high-voltage power supply. This state is generally determined based on system safety and operational requirements. When FCU_HVShutdownAllow is 0, it indicates that the power supply can be disconnected.

[0108] Step S50: Shut down the fuel cell according to the shutdown condition and the high voltage power-off permission state.

[0109] It should be noted that once the fuel cell shutdown conditions are met and the FCU confirms that the high-voltage power outage is allowed, the VCU will send a shutdown instruction to the FCU, instructing it to start the shutdown process.

[0110] In a feasible implementation, step S50 may further include step A51:

[0111] Step A51, when the shutdown condition is that the communication state is the preset communication state and the communication state is maintained for longer than the preset communication time, a shutdown instruction is sent to the fuel cell control unit according to the high-voltage power-off permission state, so that the fuel cell control unit controls the vehicle to power off the high voltage according to the shutdown instruction and completes the shutdown operation.

[0112] It can be understood that when the shutdown condition is that the communication state is the preset communication state and the communication state is maintained for a time greater than the preset communication time, it means that if the FCU is not communicating for a timeout, then when the high-voltage power-off permission state is power-off permission, the VCU continues to send a shutdown command to the FCU, the VCU internally allows the high voltage to be lowered, and the shutdown is completed.

[0113] This embodiment provides a fuel cell start-stop stack control method for a hydrogen fuel cell vehicle. By comprehensively monitoring and intelligently judging key parameters such as the vehicle's high-voltage power-on status, the status of the fuel cell system, the battery's state of charge, the charging power, and the communication status, the method solves the problem that hydrogen fuel cell vehicles cannot accurately control the start and stop of the fuel cell under different operating conditions. While ensuring system safety, it optimizes the start-up and shutdown operations of the fuel cell, improves the reliability and service life of the fuel cell system, and avoids the problem of overcharging of the power battery or frequent start-stopping of the fuel cell system due to SOC deviation, thereby achieving the beneficial effect of improving the energy efficiency and performance of the entire vehicle.

[0114] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above embodiment 1 can be referred to the above introduction and will not be described in detail later. Figure 3 The step S50 of the fuel cell start-stop stack control method for a hydrogen fuel vehicle includes steps S51 to S53:

[0115] Step S51, when the shutdown condition is that the vehicle is in a non-high-voltage power-on state, obtaining a high-voltage power-off state of the vehicle;

[0116] It should be noted that the vehicle's non-high-voltage powered state indicates that the vehicle's high-voltage system is not active, meaning the vehicle may be parked or not ready to drive. If the shutdown condition is that the vehicle is not in the high-voltage powered state, proceed to the subsequent steps. Obtaining the high-voltage powered state indicates that you need to confirm whether the vehicle is in the high-voltage powered off state.

[0117] Step S52, obtaining a preset high voltage permission state reception time according to the high voltage power-off permission state;

[0118] It should be noted that the preset high-voltage permission state reception time is a pre-set time value used to determine how long the fuel cell system should wait before performing a power-off operation after receiving a high-voltage power-off permission state signal.

[0119] Step S53 , shutting down the fuel cell stack according to the high-voltage power-off state and the preset high-voltage permission state reception time.

[0120] It is understandable that the specific operation of the shutdown needs to be determined based on the current high voltage power-off state and the preset high voltage permission state reception time.

[0121] In a feasible implementation, step S53 may include steps S531 to S533:

[0122] Step S531, obtaining a first preset receiving time and a second preset receiving time, wherein the first preset receiving time is less than the second preset receiving time;

[0123] It should be noted that the first preset reception time is a pre-set time value used to determine how long the fuel cell system should wait to perform a shutdown operation after the fuel cell control unit (FCU) sends a high-voltage power-off permission signal. This time value is typically set relatively short to facilitate a quick response when conditions permit. The second preset reception time serves the same purpose as the first preset reception time, but is longer. In this embodiment, the first preset reception time is 300 seconds, and the second preset reception time is 600 seconds.

[0124] Step S532: When the high-voltage power-off state is non-high-voltage power-off and the preset high-voltage permission state reception time is greater than the first preset reception time, sending a shutdown instruction to the fuel cell control unit, so that the fuel cell control unit completes the fuel cell shutdown according to the shutdown instruction;

[0125] It can be understood that when the high-voltage power-off state is non-high-voltage power-off and the preset high-voltage allowed state reception time is greater than the first preset reception time, it means that the vehicle is in a non-high-voltage state, and the VCU has not received FCU_HVShutdownAllow==0 (power off allowed) within 300s.

[0126] In addition, it is understandable that when it is determined that this is the case, the VCU continues to send the stack shutdown instruction to the FCU after 300 seconds, and the high voltage is allowed to be lowered inside the VCU, and the stack shutdown is completed.

[0127] Step S533 , when the high voltage power-off state is high voltage power-off and the preset high voltage permission state reception time is greater than the second preset reception time, the high voltage circuit between the fuel cell and the vehicle is cut off to complete the fuel cell shutdown.

[0128] It can be understood that the high-voltage power-down state is high-voltage power-down and the preset high-voltage allowed state reception time is greater than the second preset reception time, indicating that the vehicle is in the low-voltage state and FCU_HVShutdownAllow==0 (power off allowed) is not received within 600s.

[0129] It should be noted that a DCDC converter (Direct Current to Direct Current converter) is a power conversion device used to convert direct current (DC) power at one voltage level into DC power at another voltage level. The DCDC converter plays a vital role in fuel cell systems, allowing the system to operate normally under different voltage requirements. DCDC enable refers to the activation or start-up of the DCDC converter's operating state. In the enabled state, the DCDC converter begins performing its power conversion function.

[0130] In addition, it is understandable that when it is judged that this is the case, the VCU continues to send the stack shutdown command to the FCU after 600s. The VCU allows the high voltage to be lowered, that is, the vehicle is allowed to disconnect the main positive relay, cutting off the fuel cell system and the vehicle high-voltage circuit, and then continues to stop the DCDC enable, disconnect the auxiliary drive relay, disconnect the main negative relay, and complete the high-voltage power-down. After that, the VCU disconnects the FCU and HMS wake-up power by controlling the low-voltage relay to complete the stack shutdown.

[0131] It is understandable that waiting for the FCU high-voltage power-off permission before disconnecting the main positive relay can prevent forcibly disconnecting the stack high-voltage output circuit while the FCU is still outputting power, which could damage the stack system. Waiting for the FCU low-voltage power-off permission before disabling the DCDC enable can prevent prolonged FCU purges from causing battery overload.

[0132] Reference Figure 4 , Figure 4 This is a schematic diagram of the shutdown process of the second embodiment of the fuel cell start-stop control method for hydrogen fuel vehicles of this application. Figure 4 As shown:

[0133] After the VCU stack startup is completed and the fuel cell mode sends VCU_cmdFCU=1 to start the fuel cell. After the FCU is started, it continuously sends the FCU operation status message with ID 0x18FFA1D1, which contains the fuel cell system operation status, namely FCU_Sts. Determine whether FCU Sts is not equal to 0, not equal to 2, or not equal to 7, and whether VCU_ReadyStatus is equal to 0, and whether ReadyStatus is equal to 1 and the EV switch is valid, whether the FCU communication timeout exceeds 60s, and whether the charging power allowed by the BMS is less than the minimum net output power allowed by the fuel cell battery. If one of the above judgment conditions is met, the step of shutting down the fuel cell is entered. The VCU controls the shutdown of the fuel cell and sends VCU_cmdFCU=0 to shut down the fuel cell and assigns VCU_DemandPower to 0. After receiving the high-voltage power-off permission FCU_HVShutdowA1low sent by the FCU, determine whether the FCU is not in communication timeout and receives the FCU_HVShutdowA1low signal, determine whether the signal reception time in the non-high-voltage state exceeds 300s, and determine whether the signal reception time in the high-voltage state exceeds 600s. When any of the above conditions is met, enter the VCU internal high-voltage state.

[0134] This embodiment provides a fuel cell start-stop control method for a hydrogen fuel cell vehicle. By detecting the vehicle's high-voltage power-down state when not in the high-voltage power-up state and determining the specific timing for shutdown based on a preset high-voltage permissible state reception time, this method implements a 300-second wait time when not in the high-voltage power-down state or a 600-second wait time when in the high-voltage power-down state. This ensures that the high-voltage circuit is safely shut down after the fuel cell system completes all necessary operations, avoiding damage to the fuel cell system and reducing battery power issues caused by prolonged FCU purges. This method solves the challenge of ensuring the safe and efficient shutdown of the fuel cell before the high-voltage system is de-energized, thereby improving the reliability and service life of the fuel cell system. If the vehicle is not in the high-voltage power-down state, the shutdown is complete. If the vehicle is in the high-voltage power-down state, the vehicle disconnects the main positive relay, isolating the fuel-power circuit from the vehicle's high-voltage circuit. The VCU exits fuel-power management mode, sends VCUcmdFCU = 0, and sets VCUDemandPower to 0. The DC-DC enable is deactivated, the auxiliary drive relay is disconnected, and the main negative relay is disconnected, completing the high-voltage power-down. After the vehicle is powered off at low voltage, the VCU disconnects the FCU and HMS wake-up sources through the low-voltage relay, the VCU goes into sleep mode, and the stack is shut down.

[0135] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the fuel cell start-stop stack control method for hydrogen fuel vehicles of the present application. More simple transformations based on this technical concept are all within the scope of protection of the present application.

[0136] This application also provides a fuel cell start-stop stack control device for hydrogen fuel vehicles, please refer to Figure 5 , the fuel cell start-stop stack control device of the hydrogen fuel vehicle includes:

[0137] The power-on module 10 is used to control the vehicle's high-voltage power-on and detect whether the fuel cell meets the stacking conditions;

[0138] The receiving module 20 is configured to receive the stack operation status sent by the fuel cell control unit when it is detected that the fuel cell meets the stack starting conditions;

[0139] A stacking module 30 is used to stack the fuel cell according to the operating state of the fuel cell stack and detect whether the fuel cell stack meets the shutdown condition;

[0140] The receiving module 20 is further configured to receive a high voltage power-off permission status signaled by the fuel cell control unit when it is detected that the fuel cell meets a shutdown condition.

[0141] The shutdown module 40 is configured to shut down the fuel cell according to the shutdown condition and the high voltage power-off permission state.

[0142] The fuel cell start-stop stack control device for a hydrogen fuel cell vehicle provided in this application utilizes the fuel cell start-stop stack control method for a hydrogen fuel cell vehicle described in the aforementioned embodiments, thereby resolving the technical issues of inaccuracy and insecurity caused by the hydrogen fuel cell vehicle start-stop control strategy relying solely on the power battery SOC value. Compared to the prior art, the beneficial effects of the fuel cell start-stop stack control device for a hydrogen fuel cell vehicle provided in this application are the same as those of the fuel cell start-stop stack control method for a hydrogen fuel cell vehicle provided in the aforementioned embodiments. The other technical features of the fuel cell start-stop stack control device for a hydrogen fuel cell vehicle are the same as those disclosed in the aforementioned embodiments and are not further elaborated upon here.

[0143] In one embodiment, the power-on module 10 is also used to control the high-voltage power-on of the vehicle; obtain the switch state of the vehicle's electric vehicle mode, the battery charge state, the preset charge state, the communication state of the fuel cell control unit, and the charging power and preset charging power of the battery management system; when the switch state is invalid, the battery charge state is less than the preset charge state, the communication state is the preset communication state, and the charging power is greater than the preset charging power, it is determined that the fuel cell meets the stacking conditions.

[0144] In one embodiment, the stacking module 30 is further used to send a stacking instruction to the fuel cell control unit when the stack operating state is the first operating state, the second operating state, and the third operating state, so that the fuel cell control unit feeds back the new stack operating state and records the instruction sending time; obtains the instruction sending time period according to the instruction sending time; and sends a stack start instruction to the fuel cell control unit when the instruction sending time period is less than the preset sending time period and the new stack operating state is the second operating state or the fourth operating state, so that the fuel cell control unit performs fuel cell stacking according to the stack start instruction.

[0145] In one embodiment, the stacking module 30 is also used to obtain the switch state of the vehicle's electric vehicle mode, the battery charge state, the preset charge state, the communication state of the fuel cell control unit, the communication state maintenance time, and the charging power of the battery management system and the preset charging power; when the vehicle is in a non-high-voltage power-on state, the switch state is a valid state, the battery charge state is greater than or equal to the preset charge state, the charging power is less than the preset charging power, the communication state is a preset communication state and the communication state maintenance time is greater than the preset communication time, and the stack operating state is not at least one of the second operating state, the third operating state, and the fourth operating state, it is determined that the fuel cell meets the shutdown condition.

[0146] In one embodiment, the shutdown module 40 is further configured to send a shutdown instruction to the fuel cell control unit according to the high-voltage power-off permission state when the shutdown condition is that the communication state is a preset communication state and the communication state is maintained for a time greater than the preset communication time, so that the fuel cell control unit controls the vehicle to power off the high voltage according to the shutdown instruction and completes the shutdown operation.

[0147] In one embodiment, the shutdown module 40 is further configured to obtain the high-voltage power-off state of the vehicle when the shutdown condition is that the vehicle is in a non-high-voltage power-on state; obtain a preset high-voltage permission state reception time based on the high-voltage power-off permission state; and shut down the fuel cell stack based on the high-voltage power-off state and the preset high-voltage permission state reception time.

[0148] In one embodiment, the shutdown module 40 is further used to obtain a first preset receiving time and a second preset receiving time, wherein the first preset receiving time is less than the second preset receiving time; when the high-voltage power-off state is non-high-voltage power-off and the preset high-voltage permission state receiving time is greater than the first preset receiving time, a shutdown instruction is sent to the fuel cell control unit so that the fuel cell control unit completes the fuel cell shutdown according to the shutdown instruction; when the high-voltage power-off state is high-voltage power-off and the preset high-voltage permission state receiving time is greater than the second preset receiving time, the high-voltage circuit between the fuel cell and the vehicle is cut off to complete the fuel cell shutdown.

[0149] The present application provides a fuel cell start-stop stack control device for a hydrogen fuel vehicle, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the fuel cell start-stop stack control method for a hydrogen fuel vehicle in the above-mentioned embodiment one.

[0150] Reference below Figure 6 , which shows a schematic structural diagram of a fuel cell start-stop stack control device for a hydrogen fuel vehicle suitable for implementing an embodiment of the present application. The fuel cell start-stop stack control device for a hydrogen fuel vehicle in the embodiment of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 6The fuel cell start-stop stack control device for a hydrogen fuel vehicle shown is merely an example and should not impose any limitations on the functions and scope of use of the embodiments of the present application.

[0151] like Figure 6 As shown, the fuel cell start-stop stack control device of a hydrogen fuel vehicle may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM: Read Only Memory) 1002 or the program loaded from the storage device 1003 to the random access memory (RAM: Random Access Memory) 1004. Various programs and data required for the operation of the fuel cell start-stop stack control device of the hydrogen fuel vehicle are also stored in the RAM 1004. The processing device 1001, ROM 1002 and RAM 1004 are connected to each other via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the fuel cell start-stop stack control device of a hydrogen fuel vehicle to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a fuel cell start-stop stack control device of a hydrogen fuel vehicle with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have instead.

[0152] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program comprising program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0153] The fuel cell start-stop stack control device for a hydrogen fuel cell vehicle provided in this application utilizes the fuel cell start-stop stack control method for a hydrogen fuel cell vehicle described in the aforementioned embodiment, thereby resolving the technical issues of inaccuracy and insecurity caused by the hydrogen fuel cell vehicle start-stop control strategy relying solely on the power battery SOC value. Compared to the prior art, the fuel cell start-stop stack control device for a hydrogen fuel cell vehicle provided in this application achieves the same beneficial effects as the fuel cell start-stop stack control method for a hydrogen fuel cell vehicle provided in the aforementioned embodiment. The other technical features of the fuel cell start-stop stack control device for a hydrogen fuel cell vehicle are the same as those disclosed in the aforementioned embodiment and are not further elaborated upon here.

[0154] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0155] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

[0156] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, a computer program) stored thereon, and the computer-readable program instructions are used to execute the fuel cell start-stop stack control method for a hydrogen fuel vehicle in the above-mentioned embodiment.

[0157] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0158] The computer-readable storage medium may be included in the fuel cell start-stop stack control device of the hydrogen fuel vehicle; or may exist independently without being assembled into the fuel cell start-stop stack control device of the hydrogen fuel vehicle.

[0159] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned one or more programs are executed by the fuel cell start-stop stack control device of the hydrogen fuel vehicle, the fuel cell start-stop stack control device of the hydrogen fuel vehicle: controls the vehicle high-voltage power-on and detects whether the fuel cell meets the stack starting conditions; when it is detected that the fuel cell meets the stack starting conditions, receives the stack operation status sent by the fuel cell control unit; starts the fuel cell according to the stack operation status, and detects whether the fuel cell meets the stack stopping conditions; when it is detected that the fuel cell meets the stack stopping conditions, receives the high-voltage power-off permission status sent by the fuel cell control unit; and shuts down the fuel cell according to the stack stopping conditions and the high-voltage power-off permission status.

[0160] Computer program code for performing the operations of the present application may be written in one or more programming languages, or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0161] The flow charts and block diagrams in the accompanying drawings illustrate the possible architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, program segment or a part of code, and the module, program segment or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order than that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or operation, or can be implemented by a combination of dedicated hardware and computer instructions.

[0162] The modules described in the embodiments of the present application may be implemented in software or hardware, wherein the name of a module does not necessarily limit the unit itself.

[0163] The computer-readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the aforementioned method for controlling the start-stop stack of a fuel cell vehicle for hydrogen fuel cells. This computer-readable storage medium can address the technical issues of inaccuracy and insecurity caused by the hydrogen fuel cell vehicle start-stop control strategy relying solely on the power battery SOC value. Compared to the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the method for controlling the start-stop stack of a fuel cell vehicle for hydrogen fuel cells provided in the aforementioned embodiments, and are not further elaborated here.

[0164] The present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of the above-mentioned fuel cell start-stop stack control method for a hydrogen fuel vehicle.

[0165] The computer program product provided in this application can address the technical issues of inaccuracy and insecurity caused by relying solely on the power battery SOC value for the start-stop control strategy of hydrogen fuel cell vehicles. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the fuel cell start-stop stack control method for hydrogen fuel cell vehicles provided in the above-mentioned embodiments, and will not be further elaborated here.

[0166] The above description is only part of the embodiments of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made by using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A method for controlling the start and stop of a fuel cell stack of a hydrogen fuel vehicle, characterized in that: The method comprises: Control vehicle high voltage power-up; Obtain the vehicle's electric vehicle mode switch status, battery state of charge, preset state of charge, fuel cell control unit communication status, and battery management system charging power and preset charging power; When the switch state is an invalid state, the battery state of charge is less than the preset state of charge, the communication state is a preset communication state, and the charging power is greater than a preset charging power, determining that the fuel cell meets the stacking condition; When it is detected that the fuel cell meets the stack starting condition, receiving the stack operation status sent by the fuel cell control unit; Starting up the fuel cell stack according to the stack operation status, and detecting whether the fuel cell stack meets the shutdown condition; When it is detected that the fuel cell meets the shutdown condition, receiving the high voltage power-off permission state sent by the fuel cell control unit; Shutting down the fuel cell according to the shutdown condition and the high-voltage power-off permission state; The step of shutting down the fuel cell according to the shutdown condition and the high voltage power-off permission state comprises: When the shutdown condition is that the communication state is a preset communication state and the communication state is maintained for longer than the preset communication time, a shutdown instruction is sent to the fuel cell control unit according to the high-voltage power-off permission state, so that the fuel cell control unit controls the vehicle to power off the high voltage according to the shutdown instruction and completes the shutdown operation; The step of shutting down the fuel cell according to the shutdown condition and the high voltage power-off permission state further includes: When the shutdown condition is that the vehicle is in a non-high-voltage powered state, obtaining a high-voltage powered-off state of the vehicle; According to the high-voltage power-off permission state, a preset high-voltage permission state reception time is obtained; Obtaining a first preset receiving time and a second preset receiving time, wherein the first preset receiving time is less than the second preset receiving time; When the high-voltage power-off state is non-high-voltage power-off and the preset high-voltage permission state reception time is greater than the first preset reception time, sending a shutdown instruction to the fuel cell control unit, so that the fuel cell control unit completes the fuel cell shutdown according to the shutdown instruction; When the high-voltage power-off state is high-voltage power-off and the preset high-voltage permission state reception time is greater than the second preset reception time, the high-voltage circuit between the fuel cell and the vehicle is cut off to complete the fuel cell shutdown.

2. The method according to claim 1, wherein The step of starting up the fuel cell stack according to the operating state of the fuel cell stack comprises: When the stack operating state is a first operating state, a second operating state, and a third operating state, sending a stack start instruction to the fuel cell control unit so that the fuel cell control unit feeds back the new stack operating state and records the time when the instruction is sent, wherein the first operating state, the second operating state, and the third operating state respectively represent a ready state, a starting state, and a power-on self-test state; Obtaining the instruction sending time period according to the instruction sending time; When the instruction sending time period is less than the preset sending time period and the new stack operating state is the second operating state or the fourth operating state, a stack start instruction is sent to the fuel cell control unit so that the fuel cell control unit starts the fuel cell stack according to the stack start instruction, and the fourth operating state is the operating state.

3. The method according to claim 2, wherein The step of detecting whether the fuel cell meets the shutdown condition comprises: Obtain the vehicle's electric vehicle mode switch status, battery state of charge, preset state of charge, fuel cell control unit communication status, communication state retention time, and battery management system charging power and preset charging power; When the vehicle is in a non-high-voltage power-on state, the switch state is in a valid state, the battery state of charge is greater than or equal to the preset state of charge, the charging power is less than the preset charging power, the communication state is a preset communication state and the communication state is maintained for a time greater than the preset communication time, and the stack operating state is not at least one of the second operating state, the third operating state, and the fourth operating state, it is determined that the fuel cell meets the shutdown conditions.

4. A fuel cell start-stop stack control device for a hydrogen fuel vehicle, used to execute the fuel cell start-stop stack control method for a hydrogen fuel vehicle according to claim 1, characterized in that: The device comprises: The power-on module is used to control the vehicle's high-voltage power supply and detect whether the fuel cell meets the stacking conditions; A receiving module, configured to receive a stack operation status sent by a fuel cell control unit when detecting that the fuel cell meets a stack start-up condition; A stacking module, configured to stack the fuel cell according to the operating state of the fuel cell stack and detect whether the fuel cell stack meets the shutdown condition; The receiving module is further configured to receive a high voltage power-off permission status sent by the fuel cell control unit when it is detected that the fuel cell meets a shutdown condition; A shutdown module is used to shut down the fuel cell according to the shutdown condition and the high-voltage power-off permission state.

5. A fuel cell start-stop stack control device for a hydrogen fuel vehicle, characterized in that: The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the fuel cell start-stop stack control method for a hydrogen fuel vehicle according to any one of claims 1 to 3.

6. A storage medium, characterized in that The storage medium is a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the fuel cell start-stop stack control method for a hydrogen fuel vehicle according to any one of claims 1 to 3 are implemented.

Images