Power-off method of hydrogen-electric power automobile and fuel cell controller

Abstract

The invention provides a power-off method of a hydrogen electric vehicle and a fuel cell controller. The power-off method is applied to the hydrogen-electricity power automobile, and the hydrogen-electricity power automobile comprises a hydrogen-electricity system with a fuel cell system and a whole automobile system. The whole vehicle system comprises a whole vehicle controller and a power battery system; the fuel cell system comprises a fuel cell controller, and the fuel cell controller is in one-way communication connection with the power cell system and the whole vehicle controller. The method specifically comprises the following steps: acquiring a state of a peripheral in the fuel cell system; judging whether the fuel cell system breaks down or not based on whether the state of the peripheral is abnormal or not; if yes, controlling the fuel cell system to supply high-voltage power and low-voltage power; if not, whether the running state data of the hydrogen-electricity system meet the normal use condition or not is judged according to the running state data of the whole vehicle system; and under the condition of judging that the running state data of the hydrogen-electricity system does not meet the normal use condition, controlling the fuel cell system to lower high-voltage electricity and low-voltage electricity.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen - electric powered vehicles, and particularly to a power - off method for a hydrogen - electric powered vehicle and a fuel cell controller. Background Art

[0002] Hydrogen fuel, with its advantages of light weight, high energy density, zero emissions, pollution - free, recyclable, etc., has become one of the main power development directions of future new - energy vehicles recognized by the industry. However, there are not many cases of hydrogen - electric technology being installed in passenger cars, resulting in many core functions and control strategies being immature and not forming a platform - based strategic solution. Each OEM (Original Equipment Manufacturer) designs and develops according to its own understanding, leading to repeated problems and low reuse rate, which greatly wastes manpower and material resources. Summary of the Invention

[0003] This application provides a power - off method for a hydrogen - electric powered vehicle and a fuel cell controller, which greatly reduces the development and time costs.

[0004] This application provides a power - off method for a hydrogen - electric powered vehicle. The hydrogen - electric powered vehicle includes a hydrogen - electric system, and the hydrogen - electric system includes a vehicle system and a fuel cell system. The vehicle system includes a vehicle controller and a power battery system; the fuel cell system includes a fuel cell controller, and the fuel cell controller is unidirectionally communicatively connected to the power battery system and the vehicle controller respectively. The power - off method is applied to the fuel cell controller, and the power - off method for the hydrogen - electric powered vehicle includes:

[0005] Obtain the status of peripherals within the fuel cell system;

[0006] Based on whether the status of the peripherals is abnormal, determine whether the fuel cell system has a fault;

[0007] In the case of determining that the fuel cell system has a fault, control the fuel cell system to cut off high - voltage power and low - voltage power;

[0008] In the case of determining that the fuel cell system has no fault, based on the operation status data of the vehicle system, determine whether the operation status data of the hydrogen - electric system meets the normal use conditions;

[0009] In the case of determining that the operation status data of the hydrogen - electric system does not meet the normal use conditions, control the fuel cell system to cut off high - voltage power and low - voltage power.

[0010] Further, determining whether the operation status data of the hydrogen - electric system meets the normal use conditions includes:

[0011] Determine whether the remaining amount of hydrogen fuel in the fuel cell system reaches a preset power generation threshold; correspondingly, the operating state data of the hydrogen-electric system not meeting the normal use conditions includes: the remaining amount of hydrogen fuel in the fuel cell system does not reach the preset power generation threshold;

[0012] Or,

[0013] Determine whether the remaining power of the power battery system reaches a preset usage threshold; correspondingly, the operating state data of the hydrogen-electric system not meeting the normal use conditions includes: the remaining power of the power battery system does not reach the preset usage threshold;

[0014] Or,

[0015] In the case where the remaining amount of hydrogen fuel in the fuel cell system reaches the preset power generation threshold and the remaining power of the power battery system does not reach the preset usage threshold, determine whether the remaining power of the power battery system after charging the power battery system reaches the preset usage threshold; correspondingly, the operating state data of the hydrogen-electric system not meeting the normal use conditions includes: one or more of the remaining amount of hydrogen fuel in the fuel cell system after charging does not reach the preset power generation threshold, and the remaining power of the power battery system after charging does not reach the preset usage threshold.

[0016] Further, in the case of determining that the operating state data of the hydrogen-electric system does not meet the normal use conditions, controlling the fuel cell system to cut off high voltage and low voltage includes:

[0017] In the case of determining that the operating state data of the hydrogen-electric system does not meet the normal use conditions, controlling the fuel cell system to perform load reduction, purging, and oxygen-consuming discharge; the load reduction of the fuel cell system is used to reduce the output of the fuel cell system;

[0018] In the case where the output of the fuel cell system continues to decrease until it reaches a preset value and meets the power-off condition of the fuel cell system, control the fuel cell system to cut off high voltage and low voltage.

[0019] Further, in the case where the output of the fuel cell system continues to decrease until it reaches a preset value and meets the power-off condition of the fuel cell system, controlling the fuel cell system to cut off high voltage and low voltage includes:

[0020] In the case where the output of the fuel cell system continues to decrease until it reaches a preset value, control the high-voltage devices in the fuel cell system to stop working and disconnect the high-voltage relay of the fuel cell system so that the fuel cell system cuts off high voltage;

[0021] After the high-voltage operation of the fuel cell system is completed, control the low-voltage components in the fuel cell system to stop working and disconnect the low-voltage relay of the fuel cell system to complete the low-voltage operation of the fuel cell system.

[0022] Further, after determining whether the operating state data of the hydrogen-electric system meets the normal usage conditions, the method further includes:

[0023] When it is determined that the operating state data of the hydrogen-electric system meets the normal usage conditions, identify whether the vehicle system is powering off according to the vehicle operating state of the operating state data of the vehicle system; when it is identified that the vehicle system is powering off, control the fuel cell system to cut off high-voltage power and low-voltage power.

[0024] Further, when it is determined that the fuel cell system has a fault, controlling the fuel cell system to cut off high-voltage power and low-voltage power includes:

[0025] When it is determined that the fuel cell system has a fault, determine the current fault level of the fuel cell system according to the fault levels corresponding to different emergency levels; different fault levels correspond to different emergency levels;

[0026] Based on the emergency level reflected by the current fault level, control the fuel cell system to cut off high-voltage power and low-voltage power.

[0027] Further, when it is determined that the fuel cell system has a fault, determining the current fault level of the fuel cell system according to the fault levels corresponding to different emergency levels includes:

[0028] When the state of the peripheral device is in an abnormal state, determine the current fault level of the fuel cell system according to the fault levels corresponding to different emergency levels;

[0029] The controlling the fuel cell system to cut off high-voltage power and low-voltage power based on the emergency level reflected by the current fault level includes:

[0030] When the current fault level of the fuel cell system is the highest fault level with the highest emergency level, control the fuel cell system to cut off high-voltage power and low-voltage power;

[0031] When the current fault level of the fuel cell system is not the highest fault level and the current fault level of the vehicle system is the highest fault level, control the fuel cell system to cut off high-voltage power and low-voltage power.

[0032] Further, controlling the high-voltage power-off and low-voltage power-off of the fuel cell system based on the urgency level reflected by the current fault level includes:

[0033] When the current fault level is the second-highest urgency level and the output of the fuel cell system meets the power-off conditions of the fuel cell system, controlling the fuel cell system to perform load reduction and oxygen-consuming discharge; the load reduction of the fuel cell system is used to reduce the output of the fuel cell system;

[0034] When the output of the fuel cell system continuously decreases until it reaches a preset value and meets the power-off conditions of the fuel cell system, controlling the high-voltage power-off and low-voltage power-off of the fuel cell system.

[0035] Further, controlling the high-voltage power-off and low-voltage power-off of the fuel cell system based on the urgency level reflected by the current fault level includes:

[0036] When the current fault level of the fuel cell system is the second-highest urgency level, controlling the fuel cell system to perform load reduction and oxygen-consuming discharge; and,

[0037] When the output of the fuel cell system continuously decreases until it reaches a preset value, controlling the high-voltage power-off and low-voltage power-off of the fuel cell system;

[0038] When the current fault level of the fuel cell system is not the second-highest urgency level and the current fault level of the whole vehicle system is the second-highest urgency level, controlling the fuel cell system to perform load reduction and oxygen-consuming discharge; and,

[0039] When the output of the fuel cell system continuously decreases until it reaches a preset value, controlling the high-voltage power-off and low-voltage power-off of the fuel cell system.

[0040] The present application provides a fuel cell controller for a hydrogen-electric vehicle. The fuel cell controller includes a memory, a processor, and a power-off program for the hydrogen-electric vehicle stored on the memory and executable on the processor. When the processor executes the power-off program for the hydrogen-electric vehicle, the steps of the power-off method for the hydrogen-electric vehicle described in any one of the above are implemented.

[0041] The present application provides a computer-readable storage medium with a program stored thereon. When the program is executed by a processor, the method described in any one of the above is implemented.

[0042] In some embodiments, the power - off method of the hydrogen - electric vehicle of the present application is applied to a hydrogen - electric vehicle including a hydrogen - electric system. The hydrogen - electric system includes a fuel cell system and a vehicle system. The vehicle system includes a vehicle controller and a power battery system. The fuel cell system includes a fuel cell controller, and the fuel cell controller is unidirectionally communicatively connected to the power battery system and the vehicle controller respectively. The power - off method is applied to the fuel cell controller. The power - off method of the hydrogen - electric vehicle obtains the status of peripherals in the fuel cell system; based on whether the status of the peripherals is abnormal, determines whether the fuel cell system has a fault; in the case of determining that the fuel cell system has a fault, controls the fuel cell system to cut off high - voltage power and low - voltage power; in the case of determining that the fuel cell system has no fault, based on the operating status data of the vehicle system, determines whether the operating status data of the hydrogen - electric system meets the normal use conditions; in the case of determining that the operating status data of the hydrogen - electric system does not meet the normal use conditions, controls the fuel cell system to cut off high - voltage power and low - voltage power.

[0043] In the embodiments of the present application, the power - off of the fuel cell system can be completed by using the fuel cell controller itself without changing the original vehicle structure. By integrating the hydrogen - electric system into the power domain in the form of an external connection node, this solution does not require modifying the software of the controller in the power domain, nor does the vehicle control device need to allocate any resources for the hydrogen - electric system or interact with the hydrogen - electric system. All the required information is received by the fuel cell controller (FCU) itself and the logical processing is completed by itself. At the same time, no data is sent to the power domain, which has no impact on the existing power domain and is conducive to adapting to various vehicle models. In this way, the shutdown power - off process control strategy of the hydrogen - electric vehicle has extremely high applicability, can match different configurations of vehicle models equipped with hydrogen - electric systems, and can greatly reduce the development and time costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 The following shows a topology diagram of an external - mounted hydrogen - electric system loading scheme to which the power - off method of the hydrogen - electric vehicle in the embodiments of the present application is applied;

[0045] Figure 2 The following shows a flowchart of the power - off method of the hydrogen - electric vehicle in the embodiments of the present application;

[0046] Figure 3 The following shows Figure 1 A flowchart of the power - off method of the hydrogen - electric vehicle in the case of a fault;

[0047] Figure 4 The following shows Figure 1 A flowchart of a specific example of the power - off method of the hydrogen - electric vehicle;

[0048] Figure 5The flowchart specifically defined by step 140 is shown for the power - off method of the hydrogen - electric vehicle according to the embodiment of the present application;

[0049] Figure 6 The block diagram of the fuel - cell controller of the hydrogen - electric vehicle provided by the embodiment of the present application is shown. Detailed implementation manners

[0050] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with one or more embodiments of this specification. Instead, they are merely examples of the devices and methods consistent with some aspects of one or more embodiments of this specification as detailed in the appended claims.

[0051] It should be noted that: In other embodiments, the steps of the corresponding methods are not necessarily executed in the order shown and described in this specification. In some other embodiments, the steps included in the method may be more or less than those described in this specification. In addition, a single step described in this specification may be decomposed into multiple steps for description in other embodiments; and multiple steps described in this specification may also be combined into a single step for description in other embodiments.

[0052] The hydrogen - electric vehicle according to the embodiment of the present application generally refers to a vehicle equipped with hydrogen - electric technology, in which the hydrogen fuel cell in the hydrogen - electric technology and the in - vehicle power - battery pack form a multi - energy system. The vehicle includes hybrid new - energy vehicles and other vehicles with the in - vehicle power - battery as the main power source or one of the power sources, and specifically can be a sedan, an SUV (Sports - Utility - Vehicle), an MPV (Multi - Purpose Vehicle), an off - road vehicle, a pickup truck, or other non - rail - borne vehicles driven by power.

[0053] The power - battery system and the vehicle - controller in the embodiment of the present application have the conventional structures and functions of the vehicles on the market currently (such as the structure, working mode, interfaces, etc. of the power - battery pack in the power - battery system), and the embodiment of the present application will not introduce them specifically.

[0054] The core of hydrogen - electric technology lies in hydrogen fuel cells. Among them, a hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. Its basic principle is the reverse reaction of electrolyzing water. Hydrogen and oxygen are respectively supplied to the anode and the cathode. After hydrogen diffuses outward through the anode and reacts with the electrolyte, electrons are released and reach the cathode through an external load. Hydrogen fuel, with its advantages of light weight, high energy density, zero emissions, pollution - free, recyclability, etc., has become one of the recognized main power development directions for future new - energy vehicles in the industry. However, there are not many cases of hydrogen - electric technology being installed in passenger cars, resulting in many core functions and control strategies not being mature and no platform - based strategic solutions being formed. Each OEM (Original Equipment Manufacturer) designs and develops independently, lacking reference, leading to repeated problems and low reuse rate, greatly wasting human and material resources, and failing to achieve common growth in the industry. This includes the power - off control strategy of hydrogen - electric powered vehicles. When dealing with hydrogen - electric powered vehicles with different configurations, there is no platform - based solution for the power - off process control strategy of hydrogen - electric powered vehicles, resulting in very low applicability, and thus very high development costs and development cycles.

[0055] To solve the above - mentioned technical problems, the embodiment of this application provides a power - off method for hydrogen - electric powered vehicles.

[0056] On the basis of not destroying the original vehicle architecture, the hydrogen - electric system is integrated into the vehicle's power domain in the form of an external connection point, without modifying the software of the power - domain controller. Only the fuel - cell controller is used to control the power - off of the hydrogen - electric system, which is beneficial for adapting to various vehicle models. In this way, the applicability of the power - off process control strategy for hydrogen - electric powered vehicles is extremely high, and it can match vehicle models equipped with hydrogen - electric systems with different configurations, greatly reducing development and time costs.

[0057] Specifically, referring to Figure 1 , Figure 1 The attached figure shows the topology diagram of the external - mounted hydrogen - electric system installation scheme applied to the power - off method of hydrogen - electric powered vehicles in the embodiment of this application. The hydrogen - electric system includes a vehicle system 30 and a fuel - cell system; the vehicle system 30 includes a vehicle controller 31 and a power - battery system 32. The embodiment of this application controls the power - off of the fuel - cell system by monitoring the state of the power - battery system of the vehicle system. The power - battery system in this article can include, but is not limited to, the SOC of the power - battery pack.

[0058] The fuel cell system in the above hydrogen-electric system includes an FCU (Fuel-cell Control Unit) 10, a fuel cell, and a BOP (Balance Of Plant, auxiliary system). Among them, the BOP auxiliary system includes an air supply system, a hydrogen supply system, a water and heat management system, and an electrical system. Among them, the air supply system is used to supply the oxygen required for the reaction to the fuel cell to ensure the progress of the reaction. It includes an air compressor 11, a back pressure valve 12, a humidity regulating valve 13, an air main path valve 14, an air filter, etc.; the hydrogen supply system is used to supply the required hydrogen to the fuel cell and recycle the hydrogen in the fuel cell hydrogen pipeline to improve the hydrogen utilization rate and remove the liquid water in the anode. It includes a hydrogen circulation pump 15, a shunt throttle valve 16, etc.; the water and heat management system is used to provide a good working temperature for the fuel cell controller. It includes a water pump 17, a PCT (Positive Temperature Coefficient, heater) 18, etc.; the electrical system is used to provide the vehicle demand voltage and the electrical energy required by components. It includes a first converter 19, such as a DCF (DC Converter for Fuel Cell EV) converter; a second converter 20, such as a DCL converter (DCL is responsible for converting the high-voltage power supply into the 12V / 24V low-voltage power supply required by system components).

[0059] The fuel cell controller 10 is connected to the CVM (Cell voltage monitor, fuel cell inspection module 21) through the first CAN (Controller Area Network) bus (shown as CAN0 in the figure). The CVM is used to collect the fuel cell single cell voltage (or, the total voltage of the stack) signal and send it to the fuel cell controller. By checking the single cell voltage signal, the working state of the fuel cell is judged, and corresponding control operations are performed.

[0060] The fuel cell controller 10 is connected to the VCU (Vehicle Control Unit) 31 and the power battery system 32 through the second CAN bus (shown as CAN1 in the figure) and the PCAN (Priority Controller Area Network). It is used to receive the electrical signals of the vehicle controller 31 and the power battery system 32. Among them, there are two branches on the second CAN bus, namely the first communication bus and the second communication bus. The electrical signal of the vehicle controller 31 is received through the first communication bus, and the electrical signal of the power battery system 32 is received through the second communication bus. As the main control unit, the VCU is responsible for the functions such as starting the vehicle, energy management of the vehicle, heat management of the vehicle, and powering off and shutting down the vehicle according to the vehicle operating conditions.

[0061] The fuel cell controller 10 is connected to the components in the BOP auxiliary system, the fuel cell display component 22, and the HMS (Headlight Monitoring System) 23 through the third CAN bus (CAN2 shown in the figure), and is used to control the power-off of the fuel cell system and the feedback of the power-off state. For example, the fuel cell controller 10 is communicatively connected to the fuel cell display component, and the fuel cell controller 10 is used to control the display information of the fuel cell display component according to the operating state of the fuel cell system.

[0062] The fuel cell controller 10 obtains the flashing file of the fuel cell controller 10 through the fourth CNA bus (CAN3 shown in the figure), and is used to flash the software required for the whole vehicle to control the normal operation of the whole vehicle.

[0063] It should be noted that the above CAN buses are all unidirectionally communicatively connected to the corresponding systems and components, and are used to receive the electrical signals of the corresponding systems and components. For example, the fuel cell controller is unidirectionally communicatively connected to the power battery system and the vehicle controller respectively.

[0064] In this embodiment, an external hydrogen-electric system mounting scheme is adopted, which does not require modifying the software of the vehicle power domain controller, nor does it require the vehicle control device to allocate any resources for the hydrogen-electric system, nor does it need to interact with the hydrogen-electric system. All required information is received by the fuel cell controller FCU itself and the logical vehicle is completed. At the same time, no data is sent to the power domain, which has no impact on the existing power domain, greatly reducing the development and time costs.

[0065] As an embodiment, the external hydrogen-electric system mounting scheme can be used in the prototype trial production stage.

[0066] Based on the hydrogen-electric powered vehicle corresponding to the above mounting method, the present application provides a power-off method for a hydrogen-electric powered vehicle.

[0067] The power-off method of the hydrogen-electric powered vehicle in the embodiment of the present application is applied to the fuel cell controller. The following is a detailed description.

[0068] As Figure 2 shown, Figure 2 shown is the flowchart of the power-off method of the hydrogen-electric powered vehicle in the embodiment of the present application, including the following steps 110 to step 140:

[0069] Step 110, obtain the state of the peripherals in the fuel cell system.

[0070] The above-mentioned peripherals refer to other peripherals of the whole vehicle except for the fuel cell system, the vehicle controller, and the power battery system. The above-mentioned fuel cell system includes a fuel cell controller. The peripherals respectively include low-voltage relays and high-voltage relays, a motor controller, a pre-charge relay, an ejector, hydrogen and air throttle valves, and a medium-pressure compressor, etc.

[0071] Step 120: Determine whether the fuel cell system has a fault based on whether the state of the peripherals is abnormal.

[0072] Whether the state of the peripherals in the above-mentioned step 120 is abnormal includes that the actual state of the components of the peripherals is different from or has a difference from the expected state of the components required in advance. For example, if the relay is required to be closed in advance, but the actual state is that the relay is open. Similarly, for example, if the relay is required to be open in advance, but the actual state is that the relay is closed. For example, if the opening of the hydrogen and air throttle valves is required in advance, but the actual state is that the hydrogen and air throttle valves are closed, and so on. Examples are not listed one by one here.

[0073] Step 131: When it is determined that the fuel cell system has a fault, control the high-voltage power and low-voltage power of the fuel cell system to be cut off.

[0074] Step 132: When it is determined that the fuel cell system has no fault, judge whether the operation state data of the hydrogen-electric system meets the normal use conditions according to the operation state data of the whole vehicle system.

[0075] The above method further includes judging whether the fuel cell system and the whole vehicle system have faults. The above step 132 can further include determining the real-time situation of the hydrogen-electric system when it is determined that the fuel cell system and the whole vehicle system have no faults, so as to determine whether the hydrogen-electric system can be used normally. For example, the situation of the remaining hydrogen fuel in the fuel cell system. Another example is the remaining power of the power battery system. Another example is the tire rotation speed. Another example is the tire skidding situation. Examples are not listed one by one here.

[0076] Judging whether the operation state data of the hydrogen-electric system in the above step 132 meets the normal use conditions can be realized through the following multiple embodiments:

[0077] In the first embodiment, it is determined whether the remaining amount of hydrogen fuel in the fuel cell system reaches a preset power generation threshold. Correspondingly, the operating state data of the hydrogen-electric system not meeting the normal use conditions includes that the remaining amount of hydrogen fuel in the fuel cell system does not reach the preset power generation threshold. The preset power generation threshold is used to reflect whether the remaining amount of hydrogen fuel in the fuel cell system is sufficient to charge the power battery system. The preset power generation threshold can be set according to user needs. The above preset power generation threshold is related to different systems, and the preset power generation thresholds configured by different systems are different. Exemplarily, the preset power generation threshold is greater than or equal to 2%. For example, the preset power generation threshold can be, but is not limited to, 2%. If the remaining amount of hydrogen fuel in the fuel cell system reaches the preset power generation threshold, it is sufficient to charge the power battery system. If the remaining amount of hydrogen fuel in the fuel cell system does not reach the preset power generation threshold, it is impossible to charge the power battery system. Thus, the replenishment of the remaining amount of hydrogen fuel is realized at an earlier time, thereby increasing the remaining amount of hydrogen fuel in the fuel cell system of the vehicle and ensuring sufficient endurance.

[0078] In the second embodiment, it is determined whether the remaining power of the power battery system reaches a preset usage threshold; correspondingly, the operating state data of the hydrogen-electric system not meeting the normal use conditions includes that the remaining power of the power battery system does not reach the preset usage threshold. The preset usage threshold is used to reflect whether the remaining power of the power battery system is sufficient for the vehicle to continue using. The preset usage threshold can be set according to user needs. The above preset usage threshold is related to different systems, and the preset usage thresholds configured by different systems are different. Exemplarily, the preset usage threshold is greater than or equal to 2%. For example, the preset usage threshold can be, but is not limited to, 2%. If the remaining power of the power battery system reaches the preset usage threshold, it is sufficient for the vehicle to continue using. If the remaining power of the power battery system does not reach the preset usage threshold, it is impossible for the vehicle to continue using. Thus, the power battery system is replenished with energy as early as possible, thereby increasing the remaining power of the power battery system of the vehicle and ensuring sufficient endurance.

[0079] In the third embodiment, in the case where the remaining amount of hydrogen fuel in the fuel cell system reaches the preset power generation threshold and the remaining power of the power battery system does not reach the preset usage threshold, it is determined whether the remaining power of the power battery system after being charged by the fuel cell system reaches the preset usage threshold; correspondingly, the operating state data of the hydrogen-electric system not meeting the normal use conditions includes that the remaining amount of hydrogen fuel in the fuel cell system after charging does not reach the preset power generation threshold, and one or more of the remaining power of the power battery system after charging does not reach the preset usage threshold. Thus, the hydrogen-electric system can charge the fuel cell system. When the remaining amount of hydrogen fuel in the fuel cell system reaches the preset power generation threshold, there is no need to stop for charging, improving the endurance of the vehicle.

[0080] In some examples, the hydrogen fuel system may but is not limited to include a hydrogen fuel cell. The hydrogen fuel cell corresponds to hydrogen fuel. According to the state of the power battery, the demand for energy management is calculated, and the power generation of the hydrogen fuel cell is controlled; according to the power-off request of the whole vehicle and its own system state, the shutdown of the fuel cell system is controlled. According to the SOC value of the power battery of the whole vehicle system, it is used as the trigger condition for the power generation of the hydrogen fuel cell, and according to the size of the SOC, a hierarchical power control scheme is adopted to achieve the efficient operation of the hydrogen fuel cell.

[0081] Step 140, when it is determined that the operation state data of the hydrogen power system does not meet the normal use conditions, control the fuel cell system to cut off high voltage and low voltage.

[0082] The shutdown process of the above hydrogen-powered vehicle mainly includes two parts: the whole vehicle cuts off high voltage and the fuel cell system shuts down. In the embodiment of the present application, before the whole vehicle cuts off high voltage, first use the above-mentioned power-off method to control the high-voltage devices of the fuel cell system to cut off high voltage, and then disconnect the high-voltage relay and cut off low voltage. At this time, the power-off of the fuel cell system is completed, and it is confirmed that the shutdown of the fuel cell system is completed. Subsequently, the vehicle controller VCU independently completes the high-voltage cut-off of the whole vehicle and will not send relevant information to the fuel cell system. The high-voltage cut-off of the whole vehicle in this article is independently completed by the vehicle controller VCU, that is, when the high-voltage devices of the whole vehicle cut off high voltage and then disconnect the high-voltage relay and finally cut off low voltage, it is considered that the power-off of the whole vehicle is completed.

[0083] In the embodiment of the present application, the fuel cell controller can be used to complete the power-off of the fuel cell system by itself without changing the original vehicle structure. By integrating the hydrogen power system in the form of an external connection point into the power domain, this solution does not require modifying the software of the controller in the power domain, nor does it require the vehicle control device to allocate any resources for the hydrogen power system, nor does it require information interaction with the hydrogen power system. All required information is received by the hydrogen power controller FCU itself and the logical processing is completed by itself. At the same time, no data will be sent to the power domain, which has no impact on the existing power domain and is conducive to adapting to various vehicle models. In this way, the shutdown and power-off process control strategy of the hydrogen-powered vehicle has extremely high applicability, can match different configurations of vehicle models equipped with hydrogen power systems, and can greatly reduce the development and time costs.

[0084] Combined with Figure 1 As shown in Figure 3 As shown, Figure 3 As shown in Figure 1 The flowchart in the event of a failure of the power-off method of the hydrogen-powered vehicle shown in

[0085] Step 1311, when it is determined that the fuel cell system fails, determine the current failure level of the fuel cell system according to the failure levels corresponding to different emergency levels; different failure levels correspond to different emergency levels. The higher the failure level, the more urgent the corresponding failure is. The lower the failure level, the lower the corresponding emergency level of the failure. The emergency level of the failure with the highest failure level is higher than that of the failure with the second highest failure level.

[0086] Step 1312, based on the emergency level reflected by the current failure level, control the fuel cell system to cut off high voltage and low voltage.

[0087] The above Step 1312 can be implemented through multiple embodiments:

[0088] Since the failure with the highest failure level and the highest emergency level needs to be handled within a short time, in the first embodiment of the above Step 1312, when the current failure level is the highest failure level with the highest emergency level, control the fuel cell system to cut off high voltage and low voltage. In this way, within a short time, without time to continue other processing, directly control the fuel cell system to cut off high voltage and low voltage urgently, so as to facilitate subsequent timely maintenance.

[0089] Since the data to be judged by the fuel cell system is less than that of the whole vehicle system, and the fuel cell system plays an extremely important role in the whole vehicle, in order to obtain the judgment result faster. Therefore, the above Step 1311 further includes the following 1); correspondingly, Step 1312 further includes the following specific steps 2) to 3):

[0090] 1), when the state of the peripheral device is in an abnormal state, determine the current failure level of the fuel cell system according to the failure levels corresponding to different emergency levels. 2), when the current failure level of the fuel cell system is the highest failure level, control the fuel cell system to cut off high voltage and low voltage. 3), when the current failure level of the fuel cell system is not the highest failure level and the current failure level of the whole vehicle system is the highest failure level, control the fuel cell system to cut off high voltage and low voltage. In this way, first judge whether the fuel cell system has the problem of the highest failure level, which is easier to judge, thus improving the overall detection efficiency of the hydrogen-electric vehicle.

[0091] Among them, at this time, the faults corresponding to the highest-level fault level of the fuel cell system are high-level faults that directly affect the safety of the fuel cell system and the whole vehicle and will cause serious impacts in a very short time. For example, faults such as hydrogen leakage and high-voltage short circuit. At this time, the highest fault corresponding to the highest-level fault level of the whole vehicle system is a fault that directly affects the fuel cell system and the safety of the whole vehicle and will cause serious impacts in a very short time. For example, high-voltage short circuit, electric leakage, power loss, etc., and enter the shutdown process within 3 to 5 seconds.

[0092] As Figure 4 shown, Figure 4 shown in Figure 1 is a flowchart of a specific example of the power-off method of a hydrogen-electric vehicle shown. Among them, the fuel cell system controller can also be simply referred to as the fuel cell system controller. The fuel cell system shown can also be simply referred to as the fuel cell system.

[0093] Continue Figure 3 , as Figure 4 shown in the example, [1], the FCU collects the operation status data of the peripheral systems of the whole vehicle system: the FCU collects the status of the peripheral systems of the whole vehicle system in the fuel cell system in real time.

[0094] [2], the FCU judges whether there is a high-level fault in the fuel cell system: the FCU judges whether there is a high-level fault in the fuel cell system according to the operation status data of the peripherals; if such a high-level fault exists, the fuel cell system needs to perform emergency processing and execute the next step [3], otherwise execute [4].

[0095] [3], the FCU disconnects the high-voltage relay of the fuel cell system, disconnects the low-voltage relay of the fuel cell system, and the FCU enters the low-power state: the FCU immediately disconnects the high-voltage relay of the fuel cell system; the FCU immediately disconnects the low-voltage relay of the fuel cell system, so that the entire fuel cell system powers off both high voltage and low voltage at the same time. After that, the FCU enters the low-power state, that is, the fuel cell system shuts down; or, wait for the DCDC (Direct Current) to delay for 6 minutes to power off, to ensure that the power-off process of the fuel cell system can be completed with enough time. After the fuel cell system shuts down, the subsequent whole vehicle system powers off high voltage.

[0096] [4], the FCU reads the fault operation status data of the whole vehicle system: at this time, it is determined that there is no high-level fault in the above fuel cell system, and the FCU reads the fault operation status data of the whole vehicle system in real time to monitor the fault status of the whole vehicle system; at the same time, the FCU judges whether there is a high-level fault in the whole vehicle system. The high-level fault of the whole vehicle system at this time is defined as if such a high-level fault exists, the system needs to perform emergency processing and execute the next step [5], otherwise execute [6].

[0097] [5], the execution content is the same as that of [3], and will not be elaborated here.

[0098] [6], the FCU reads the status of the high-voltage relay in the vehicle system: It is determined that there is no high-level fault in the fault operation status data of the vehicle system. The FCU reads the operation status data of the vehicle system in real time to monitor the status of vehicle system peripherals related to the fuel cell system, such as the status of the high-voltage relay, etc.; if the high-voltage relay is disconnected unexpectedly due to external reasons (at this time, it is possible that the fault has not been determined and confirmed, or the battery system disconnects actively or as expected), the vehicle-mounted system needs to perform emergency processing and execute the next step [7], otherwise execute [8].

[0099] [7] is the same as the execution content of [3], which will not be elaborated here.

[0100] Due to the highest fault level with the highest urgency, the fault problem needs to be processed within a relatively short time. Therefore, in the second embodiment of the above step 1312, when the current fault level is the fault level with the second highest urgency and the output of the fuel cell system meets the power-off conditions of the fuel cell system, the fuel cell system is controlled to unload and perform oxygen-consuming discharge. The unloading of the above fuel cell system is used to reduce the output of the fuel cell system. And, the oxygen-consuming discharge of the above fuel cell system is used to consume the residual hydrogen fuel in the stack, so as to further ensure system safety.

[0101] When the output of the fuel cell system continues to decrease until it reaches a preset value and meets the power-off conditions of the fuel cell system, the fuel cell system is controlled to cut off the high-voltage power and the low-voltage power. When the output of the fuel cell system continues to decrease until it reaches a preset value, it indicates that the fuel cell system is about to be unable to generate electricity for the power battery system. Therefore, it is necessary to control the fuel cell system to cut off the high-voltage power and the low-voltage power. Among them, the preset value can be set according to different requirements of different systems. It is not limited here.

[0102] Since the data to be judged by the fuel cell system is less than that of the vehicle system, and the fuel cell system plays an extremely important role in the vehicle, in order to obtain the judgment result faster. Therefore, the above step 1312 further includes the following specific steps (1) to (4):

[0103] (1) When the current fault level of the fuel cell system failure is the second highest emergency level, control the fuel cell system to reduce load and consume oxygen for discharging. (2) When the output of the fuel cell system continues to decrease until it reaches a preset value, control the fuel cell system to cut off high voltage and low voltage. (3) When the current fault level of the fuel cell system failure is not the second highest emergency level and the current fault level of the whole vehicle system failure is the second highest emergency level, control the fuel cell system to reduce load and consume oxygen for discharging. (4) When the output of the fuel cell system continues to decrease until it reaches a preset value, control the fuel cell system to cut off high voltage and low voltage. In this way, it is easier to judge whether the fuel cell system has a fault level of the second highest emergency level, thus improving the overall detection efficiency of the hydrogen-electric vehicle.

[0104] Among them, the fault corresponding to the second highest fault level of the fuel cell system at this time is a second highest fault that directly or indirectly affects the safety of the fuel cell system and the whole vehicle system and will cause significant impacts in a short time. Such as too low hydrogen cylinder pressure, too low DCF voltage fault, etc., and enter the shutdown process within 10 seconds to 20 seconds.

[0105] Continue Figure 3 , as Figure 4 shown in the example, on the basis of the above [1] to [7], [8], the FCU judges whether the fuel cell system has a second highest fault: the fuel cell system judges whether the fuel cell system has a second highest fault according to the operation state data of the peripherals; if such a fault exists, the fuel cell system executes the next step [9], otherwise executes

[10] ;

[0106] [9], the FCU controls the fuel cell system to reduce load, consume oxygen for discharging, the FCU stops the operation of the high-voltage devices in the fuel cell system, the FCU disconnects the high-voltage relay of the fuel cell system, the FCU stops the operation of the low-voltage peripherals of the fuel cell system, the FCU disconnects the low-voltage relay of the fuel cell system and the FCU enters the low-power state: the fuel cell system controller FCU controls the fuel cell system to reduce load, reduces the output power of the fuel cell system to a lower power value (this value is different for different system configurations), and then consumes oxygen for discharging to consume the remaining hydrogen fuel in the fuel cell stack, so as to further ensure system safety. When the current output of the fuel cell system decreases to a lower value (this value is different for different system configurations), it can be judged that the consumption is completed. At the same time, the fuel cell system controller FCU sends an instruction or directly controls the high-voltage devices in the fuel cell system to stop working, and disconnects the high-voltage relay of the fuel cell system to ensure that the fuel cell system cuts off high voltage. Then, the fuel cell system controller FCU sends an instruction or directly controls the low-voltage devices in the fuel cell system to stop working, and disconnects the low-voltage relay of the fuel cell system to ensure that the fuel cell system cuts off low voltage. After completing the above operations, the fuel cell system controller FCU enters the sleep mode.

[0107]

[10] . The FCU determines whether there is a sub - senior fault in the vehicle system: It is determined that there is no sub - senior fault in the fuel cell system. The fuel cell system controller FCU determines whether there is a sub - senior fault in the vehicle system based on the real - time read vehicle system fault operation status data. At this time, the sub - senior fault is defined as a fault that directly or indirectly affects the safety of the system and the vehicle system and will cause a significant impact in a short time, such as high - voltage interlock, low - voltage fault, etc.; if such a fault exists, the fuel cell system executes the next step

[11] , otherwise it executes

[12] .

[0108]

[11] . It is the same as the execution content of the above

[09] and will not be elaborated here.

[0109] In the second embodiment of the above step 1312, it is simultaneously determined whether the current fault level is the highest fault level with the highest emergency degree or the fault level with the second - highest emergency degree.

[0110] Combined Figure 1 as shown Figure 5 as shown Figure 5 As shown, the flowchart specifically limited by step 140 of the power - off method for the hydrogen - electric vehicle in the embodiment of the present application is as follows. The above step 140 may further but is not limited to include the following steps 141 to step 142:

[0111] Step 141, when it is determined that the operation status data of the hydrogen - electric system does not meet the normal use conditions, control the fuel cell system to perform load reduction, purge, and oxygen - consuming discharge; the load reduction of the fuel cell system is used to reduce the output of the fuel cell system; the purge of the fuel cell system is used to remove excess water in the system to prevent the environmental temperature from affecting the fuel cell system.

[0112] Step 142, when the output of the fuel cell system continuously decreases until it reaches a preset value and meets the power - off conditions of the fuel cell system, control the fuel cell system to cut off high - voltage power and low - voltage power. The power - off conditions of the fuel cell system can be power - off conditions set according to user needs, such as the current output not being able to meet driving requirements.

[0113] The above step 142 may further include, when the output of the fuel cell system continuously decreases until it reaches a preset value, controlling the high - voltage devices in the fuel cell system to stop working and disconnecting the high - voltage relay of the fuel cell system to make the fuel cell system cut off high - voltage power. And, after the fuel cell system cuts off high - voltage power, controlling the low - voltage devices in the fuel cell system to stop working and disconnecting the low - voltage relay of the fuel cell system to complete the low - voltage power - off of the fuel cell system. In this way, through the load reduction, purge, and oxygen - consuming discharge of the fuel cell system, the effective sequential high - voltage and low - voltage power - off of the fuel cell system can be achieved.

[0114] Combined Figure 1 and Figure 5As shown, after the above step 132, the above method further includes the following steps 151 and 152: Step 151, when it is determined that the operation status data of the hydrogen-electric system meets the normal use conditions, identify whether the vehicle system is powering down based on the vehicle operation status of the operation status data of the vehicle system; Step 152, when it is identified that the vehicle system is powering down, control the fuel cell system to cut high voltage and cut low voltage. When it is monitored that the vehicle status is not powering down, the power-down and shutdown processes are not executed, and the current state is continued to be maintained. Among them, when the vehicle system is powering down, for example, the information status changed due to the power-down of the vehicle system is monitored. In this way, before the vehicle system powers down, the fuel cell system can be controlled to cut high voltage and cut low voltage preferentially to ensure the overall power-down reliability of the hydrogen-electric vehicle.

[0115] Continue Figure 3 and Figure 5 , such as Figure 4 the example shown, on the basis of the above [1] to

[11] ,

[12] , the FCU collects the data of the remaining hydrogen amount, and the FCU judges the remaining hydrogen: it is determined that there is no secondary high-level fault in the vehicle system, and the fuel cell system controller FCU monitors the status of each component in the fuel cell system in real time and calculates the remaining hydrogen fuel amount in real time. When the remaining hydrogen fuel amount ≤ 2%, the next step

[13] is executed, otherwise

[14] is executed. The remaining hydrogen fuel amount can be converted into electric energy and then the remaining hydrogen fuel amount is calculated in real time.

[0116]

[13] , compared with the execution content of the above [9], the difference is that after reducing the power output value of the fuel cell system to a lower power value, a purging operation is performed to remove the excess water in the system to prevent the ambient temperature from affecting the fuel cell system, and then an oxygen-consuming discharge is performed to consume the remaining hydrogen fuel in the fuel cell stack, so as to further ensure the system safety.

[0117]

[14] , the FCU reads the battery pack data, and the FCU judges whether the SOC reaches the discharge range: it is executed when the remaining hydrogen fuel amount > 2% (this value is different for different systems). The fuel cell system controller FCU monitors the operation status data of each system of the vehicle system in real time. When it is monitored that the SOC of the battery pack does not reach the discharge range (this value is different for different systems), the next step

[15] is executed, otherwise

[16] is executed.

[0118]

[15] is the same as the execution content of

[13] , and will not be elaborated here.

[0119]

[16] , the FCU judges whether the vehicle status is powering down: when it is monitored that the SOC of the battery pack reaches the discharge range, the fuel cell system controller FCU monitors the operation status data of each system of the vehicle system in real time, and identifies the driver's intention by reading the vehicle operation status. When it is monitored that the vehicle system status is powering down, the next step

[17] is executed, otherwise

[18] is executed.

[0120]

[17] It is the same as the execution content of

[13] and will not be elaborated here.

[0121]

[18] When it is monitored that the vehicle system status is not powering down, the power-down and shutdown processes are not executed.

[0122]

[19] All the data mentioned above are example values.

[0123] In the embodiment of the present application, an external fuel cell system is adopted and embedded into the original pure electric passenger vehicle system. The FCU is used as the main control unit of the fuel cell system, receiving relevant signals of the vehicle, not interacting with other vehicle controllers in terms of signals, keeping the original system solution and control strategy unchanged, and the FCU completes the control of the fuel cell system, the control of energy management, and the control of thermal management. At the same time, the power-down control strategy reduces the development difficulty of adjustment and expansion, can be matched with different configured vehicle models, and can reduce the development cost and shorten the development cycle.

[0124] In the embodiment of the present application, the original states of each system of the pure electric vehicle are kept unchanged, and only the software of the FCU and each BOP component of the fuel cell system is developed, which can greatly reduce the development cycle of the project, achieve a high degree of integration with the original vehicle, reduce project investment, and realize the implementation of project development.

[0125] The embodiment of the present application also provides a power-down device for a hydrogen-electric powered vehicle, which can be applied to a fuel cell controller. The above fuel cell controller may include the power-down device for a hydrogen-electric powered vehicle, which includes the following modules:

[0126] A module for obtaining the state of peripherals, which is used to obtain the state of peripherals in the fuel cell system;

[0127] A fault judgment module, which is used to judge whether the fuel cell system has a fault based on whether the state of the peripherals is abnormal;

[0128] A normal use judgment module, which is used to judge whether the operating state data of the hydrogen-electric system meet the normal use conditions according to the operating state data of the vehicle system when it is determined that the fuel cell system has no fault;

[0129] A power-down control module, which is used to control the fuel cell system to cut off high-voltage power and low-voltage power when it is determined that the operating state data of the hydrogen-electric system do not meet the normal use conditions.

[0130] In some embodiments, the device further includes: an identification module, configured to, after determining whether the operation status data of the hydrogen-electric system meets the normal usage conditions, and when it is determined that the operation status data of the hydrogen-electric system meets the normal usage conditions, identify whether the vehicle system is powering off according to the vehicle operation status of the operation status data of the vehicle system; and when it is identified that the vehicle system is powering off, control the fuel cell system to cut off high-voltage power and low-voltage power.

[0131] In some embodiments, the device further includes: a current fault level determination module, configured to, after determining whether the fuel cell system has a fault based on whether the status of the peripheral device is abnormal, and when it is determined that the fuel cell system has a fault, respectively determine the current fault levels of the fuel cell system and the vehicle system according to the fault levels corresponding to different emergency levels; different fault levels correspond to different emergency levels;

[0132] The high-voltage power cut-off and low-voltage power cut-off control module is configured to control the fuel cell system to cut off high-voltage power and low-voltage power based on the emergency level reflected by the current fault level.

[0133] For the specific implementation processes of the functions and roles of each module in the above device, please refer to the implementation processes of the corresponding steps in the above method in detail, which can achieve the same technical effects and will not be elaborated here.

[0134] Figure 6 The block diagram of the fuel cell controller 40 of the hydrogen-electric powered vehicle provided by the embodiment of the present application is shown.

[0135] As Figure 6 shown, the fuel cell controller 40 of the hydrogen-electric powered vehicle includes one or more processors 41, configured to implement the power-off method of the hydrogen-electric powered vehicle as described above.

[0136] In some embodiments, the fuel cell controller 40 of the hydrogen-electric powered vehicle may include a computer-readable storage medium 49. The computer-readable storage medium 49 may store a program that can be called by the processor 41, and may include a non-volatile storage medium. In some embodiments, the fuel cell controller 40 of the hydrogen-electric powered vehicle may include a memory 48 and an interface 47. In some embodiments, the fuel cell controller 40 of the hydrogen-electric powered vehicle may further include other hardware according to actual applications.

[0137] The computer-readable storage medium 49 of the embodiment of the present application stores a program thereon. When the program is executed by the processor 41, it is used to implement the power-off method of the hydrogen-electric powered vehicle as described above.

[0138] This application may take the form of a computer program product implemented on one or more computer-readable storage media 49 that contain program code (including but not limited to disk memory, CD-ROM, optical memory, etc.). The computer-readable storage media 49 include both permanent and non-permanent, removable and non-removable media, and may implement information storage by any method or technology. The information may be computer-readable instructions, data structures, program modules, or other data. Examples of the computer-readable storage media 49 include but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0139] The above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the scope of protection of this application.

[0140] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, commodity or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without further limitation, the element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, commodity or device comprising the said element.

Claims

1. A method for powering off a hydrogen-electric vehicle, characterized in that, The hydrogen-electric vehicle includes a hydrogen-electric system, and the hydrogen-electric system includes a vehicle system and a fuel cell system. The vehicle system includes a vehicle controller and a power battery system; the fuel cell system includes a fuel cell controller, and the fuel cell controller is unidirectionally communicatively connected to the power battery system and the vehicle controller respectively. The power-off method is applied to the fuel cell controller, and the power-off method of the hydrogen-electric vehicle includes: Obtain the status of peripherals in the fuel cell system; Based on whether the status of the peripherals is abnormal, determine whether the fuel cell system has a fault; In the case of determining that the fuel cell system has a fault, control the fuel cell system to cut off high-voltage power and low-voltage power; In the case of determining that the fuel cell system has no fault, according to the operation status data of the vehicle system, determine whether the operation status data of the hydrogen-electric system meets the normal use conditions; In the case of determining that the operation status data of the hydrogen-electric system does not meet the normal use conditions, control the fuel cell system to cut off high-voltage power and low-voltage power.

2. The power-off method of the hydrogen electric vehicle according to claim 1, characterized in that The determination of whether the operation status data of the hydrogen-electric system meets the normal use conditions includes: Determine whether the remaining hydrogen fuel amount of the fuel cell system reaches a preset power generation threshold; correspondingly, the operation status data of the hydrogen-electric system not meeting the normal use conditions includes: the remaining hydrogen fuel amount of the fuel cell system does not reach the preset power generation threshold; Or, Determine whether the remaining power of the power battery system reaches a preset use threshold; correspondingly, the operation status data of the hydrogen-electric system not meeting the normal use conditions includes: the remaining power of the power battery system does not reach the preset use threshold; Or, In the case where the remaining hydrogen fuel amount of the fuel cell system reaches the preset power generation threshold and the remaining power of the power battery system does not reach the preset use threshold, determine whether the remaining power of the power battery system after being charged by the fuel cell system reaches the preset use threshold; correspondingly, the operation status data of the hydrogen-electric system not meeting the normal use conditions includes: one or more of the remaining hydrogen fuel amount of the fuel cell system after being charged does not reach the preset power generation threshold and the remaining power of the power battery system after being charged does not reach the preset use threshold.

3. The method for powering off a hydrogen electric vehicle according to claim 1 or 2, characterized in that, The control of the fuel cell system to cut off high-voltage power and low-voltage power in the case of determining that the operation status data of the hydrogen-electric system does not meet the normal use conditions includes: In the case of determining that the operation status data of the hydrogen-electric system does not meet the normal use conditions, control the fuel cell system to reduce load, purge, and consume oxygen for discharging; the load reduction of the fuel cell system is used to reduce the output of the fuel cell system; In the case where the output of the fuel cell system continuously decreases until it reaches a preset value and meets the power-off conditions of the fuel cell system, control the fuel cell system to cut off high-voltage power and low-voltage power.

4. The power-off method of a hydrogen electric vehicle according to claim 3, characterized in that The control of the fuel cell system to cut off high-voltage power and low-voltage power in the case where the output of the fuel cell system continuously decreases until it reaches a preset value and meets the power-off conditions of the fuel cell system includes: When the output of the fuel cell system continuously decreases until it reaches a preset value, control the high-voltage devices in the fuel cell system to stop working and disconnect the high-voltage relay of the fuel cell system, so that the fuel cell system is depressurized. After the fuel cell system is depressurized, control the low-voltage devices in the fuel cell system to stop working and disconnect the low-voltage relay of the fuel cell system, so that the fuel cell system is further depressurized.

5. The method for powering off a hydrogen electric vehicle according to claim 1 or 2, characterized in that After determining whether the operating state data of the hydrogen-electric system meets the normal usage conditions, the method further includes: When it is determined that the operating state data of the hydrogen-electric system meets the normal usage conditions, identify whether the vehicle system is powering off based on the vehicle operating state of the operating state data of the vehicle system; when it is identified that the vehicle system is powering off, control the fuel cell system to be depressurized and further depressurized.

6. The method for powering off a hydrogen electric vehicle according to claim 1 or 2, characterized in that, When it is determined that the fuel cell system has a fault, controlling the fuel cell system to be depressurized and further depressurized includes: When it is determined that the fuel cell system has a fault, determine the current fault level of the fuel cell system according to the fault levels corresponding to different emergency levels; different fault levels correspond to different emergency levels. Based on the emergency level reflected by the current fault level, control the fuel cell system to be depressurized and further depressurized.

7. The power-down method of the hydrogen electric vehicle according to claim 6, characterized in that, When it is determined that the fuel cell system has a fault, determining the current fault level of the fuel cell system according to the fault levels corresponding to different emergency levels includes: When the state of the peripheral device is in an abnormal state, determine the current fault level of the fuel cell system according to the fault levels corresponding to different emergency levels. Based on the emergency level reflected by the current fault level, controlling the fuel cell system to be depressurized and further depressurized includes: When the current fault level of the fuel cell system is the highest fault level with the highest emergency level, control the fuel cell system to be depressurized and further depressurized. When the current fault level of the fuel cell system is not the highest fault level and the current fault level of the vehicle system is the highest fault level, control the fuel cell system to be depressurized and further depressurized.

8. The power-down method of a hydrogen electric vehicle according to claim 6, characterized in that, Based on the emergency level reflected by the current fault level, controlling the fuel cell system to be depressurized and further depressurized includes: When the current fault level is the fault level with the second highest emergency level and the output of the fuel cell system meets the power-off conditions of the fuel cell system, control the fuel cell system to reduce load and consume oxygen for discharging; reducing the load of the fuel cell system is used to reduce the output of the fuel cell system. When the output of the fuel cell system continuously decreases until it reaches a preset value and meets the power-off conditions of the fuel cell system, control the fuel cell system to be depressurized and further depressurized.

9. The power-off method of a hydrogen electric vehicle according to claim 8, characterized in that, Based on the emergency level reflected by the current fault level, controlling the fuel cell system to be depressurized and further depressurized includes: When the current fault level of the fuel cell system fails is the fault level with the second highest urgency level, control the fuel cell system to reduce load and perform oxygen-consuming discharge; and, When the output of the fuel cell system continuously decreases until it reaches a preset value, control the fuel cell system to cut off high-voltage power and low-voltage power; When the current fault level of the fuel cell system fails is not the fault level with the second highest urgency level and the current fault level of the vehicle system fails is the fault level with the second highest urgency level, control the fuel cell system to reduce load and perform oxygen-consuming discharge; and, When the output of the fuel cell system continuously decreases until it reaches a preset value, control the fuel cell system to cut off high-voltage power and low-voltage power.

10. A fuel cell controller for a hydrogen-electric vehicle, characterized in that, The fuel cell controller includes a memory, a processor, and a power-down program of the hydrogen-powered vehicle stored on the memory and executable on the processor. When the processor executes the power-down program of the hydrogen-powered vehicle, the steps of the power-down method of the hydrogen-powered vehicle according to any one of claims 1-9 are implemented.

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