A method and system for switching power modes of a transport vehicle

Abstract

The application discloses a kind of transport vehicle power mode switching method and system, comprising: hydrogen fuel cell transport vehicle is divided into two power modes of pure lithium battery mode and hybrid mode;Through fuel cell transport vehicle power mode entry and switching control flow, the two power modes are switched, while the power of whole vehicle and high-pressure parts is controlled, to ensure the safe and stable operation of fuel cell transport vehicle;The application designs two power modes of hydrogen fuel cell transport vehicle pure lithium mode and hybrid mode and control method, the two power modes are switched under different conditions, hydrogen fuel cell transport vehicle is reasonably controlled, to ensure the safe and stable operation of fuel cell transport vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle engineering, in particular to a transport vehicle power mode switching method and system. BACKGROUND

[0002] In recent years, hydrogen fuel cell transport vehicles use hydrogen as an energy source to drive the vehicle, and are one of the most promising vehicle categories in the 21st century. In the overall architecture of a hydrogen fuel cell transport vehicle, in addition to the hydrogen fuel cell as the main power supply of the vehicle, a lithium ion battery or a nickel-hydrogen battery is often used as an auxiliary power supply to function when the vehicle starts and stops, high-power power supply, and regenerative energy feedback.

[0003] However, so far, how to reasonably match and cooperatively control the hydrogen fuel cell and the lithium battery is still a difficulty in the industry. For example, the hydrogen fuel cell has the disadvantages of slow response speed and slow power change rate, and in the conditions of sudden acceleration, sudden deceleration, and braking of the vehicle, the lithium battery needs to quickly absorb or compensate power. If there is an error in the power matching and cooperative control of the two, the vehicle will not be able to suddenly accelerate, suddenly decelerate, and brake, and the power battery will be overcharged and the fuel cell will be blocked, which will cause safety risks to the vehicle. SUMMARY

[0004] This section aims to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of the specification to avoid obscuring the purpose of this section, abstract and title, and such simplifications or omissions cannot be used to limit the scope of the present application.

[0005] In view of the above existing problems, the present application is proposed.

[0006] Therefore, the present application provides a transport vehicle power mode switching method and system to solve the problem of power mismatching that often occurs between the fuel cell and the lithium ion battery of a hydrogen fuel cell transport vehicle.

[0007] To solve the above technical problems, the present application provides the following technical solutions:

[0008] In a first aspect, the present application provides a static stability limit calculation method, comprising:

[0009] The hydrogen fuel cell transport vehicle is divided into two power modes: pure lithium battery mode and hybrid mode;

[0010] The two power modes are switched through the fuel cell transport vehicle power mode entry and switching control process, and the power of the vehicle and high-voltage components is controlled to ensure the safe and stable operation of the fuel cell transport vehicle.

[0011] As a preferred scheme of the power mode switching method of the transport vehicle, wherein:

[0012] The hydrogen fuel cell transport vehicle is divided into two power modes, namely, a pure lithium battery mode and a hybrid mode. If the hydrogen fuel cell system is turned on and hydrogen is consumed, the power mode is the hybrid mode. If the hydrogen fuel cell system is turned off and hydrogen is not consumed, the power mode is the pure lithium battery mode.

[0013] As a preferred scheme of the power mode switching method of the transport vehicle, wherein:

[0014] The power mode entering and switching control process of the fuel cell transport vehicle includes the following steps:

[0015] The vehicle controller collects CAN signals and hard-wire signals, judges whether there is a fault that prohibits power-on and whether the vehicle power-on condition has been triggered. If there is no fault that prohibits power-on and the vehicle power-on condition has been triggered, the vehicle sends a lithium ion battery high-voltage power-on command and judges whether the lithium ion battery high-voltage power-on signal is normal. If there is a fault that prohibits power-on and the vehicle power-on condition has not been triggered, the vehicle controller prohibits the vehicle power-on;

[0016] The vehicle controller collects the lithium ion battery high-voltage power-on signal in real time, judges whether the lithium ion battery high-voltage power-on signal is normal, and if the lithium ion battery high-voltage power-on signal is in a normal state, judges the fault level of the fuel cell and the hydrogen supply system. If the lithium ion battery high-voltage power-on signal is in an abnormal state, return to judge whether there is a fault that prohibits power-on and whether the vehicle power-on condition has been triggered;

[0017] The vehicle controller collects the fault information of the fuel cell and the hydrogen supply system in real time, judges the fault level of the fuel cell and the hydrogen supply system, and if no 3-level or above fault is found in the fuel cell and the hydrogen supply system, judges the current mode gear of the power mode switch. If a 3-level or above fault is found in the fuel cell and the hydrogen supply system, the vehicle controller directly enters the pure lithium battery mode and controls the vehicle according to the pure lithium battery mode;

[0018] The vehicle controller judges the current mode gear of the power mode switch through hard-wire collection. If the power mode switch is in the hybrid mode gear, the vehicle controller sends a lithium ion battery high-voltage power-on command and judges whether the fuel cell high-voltage power-on signal is in a normal state. If the power mode switch is not in the hybrid mode gear, the vehicle controller directly enters the pure lithium battery mode and controls the vehicle according to the pure lithium battery mode;

[0019] The whole vehicle controller collects the fuel cell high voltage power-on signal in real time, judges whether the fuel cell high voltage power-on signal is in a normal state, if the fuel cell high voltage power-on signal is in the normal state, the whole vehicle controller sends an opening hydrogen supply system instruction and judges whether the opening hydrogen supply system is in the normal state, if the fuel cell high voltage power-on signal is in an abnormal state, the whole vehicle controller directly enters a pure lithium battery mode and controls the whole vehicle according to the pure lithium battery mode;

[0020] The whole vehicle controller collects the opening hydrogen supply system state signal in real time, judges whether the opening hydrogen supply system is in the normal state, if the opening hydrogen supply system is in the normal state, the whole vehicle controller sends a fuel cell start instruction and judges whether the fuel cell start is in the normal state, if the opening hydrogen supply system is in an abnormal state, the whole vehicle controller directly enters the pure lithium battery mode and controls the whole vehicle according to the pure lithium battery mode;

[0021] The whole vehicle controller collects the fuel cell start state signal in real time, judges whether the fuel cell start is in the normal state, if the fuel cell start is in the normal state, the whole vehicle controller enters a hybrid mode and controls the whole vehicle according to the hybrid mode, if the fuel cell start is in an abnormal state, the whole vehicle controller directly enters the pure lithium battery mode and controls the whole vehicle according to the pure lithium battery mode.

[0022] As a preferred scheme of the transport vehicle power mode switching method described in the application, wherein:

[0023] The fuel cell and the hydrogen supply system fault level are judged, and the fault level is divided into five levels, 0 level is no fault of the part, 1 level is slight fault of the part, 2 level is whole vehicle power limiting fault, 3 level is whole vehicle stopping fault, and 4 level is whole vehicle emergency power-off fault, and the fault severity increases from 0 level to 4 level.

[0024] As a preferred scheme of the transport vehicle power mode switching method described in the application, wherein:

[0025] The power of the whole vehicle and the high voltage parts is controlled, if the vehicle speed is greater than or equal to the set vehicle speed threshold value, the whole vehicle is prohibited from jumping from the pure lithium battery mode to the hybrid mode, if the motor speed is greater than or equal to the set speed threshold value, the whole vehicle is prohibited from jumping from the pure lithium battery mode to the hybrid mode, and if the motor torque is greater than or equal to the set torque threshold value, the whole vehicle is prohibited from jumping from the pure lithium battery mode to the hybrid mode.

[0026] If the vehicle speed is less than the set vehicle speed threshold value, the whole vehicle is allowed to jump from the pure lithium battery mode to the hybrid mode, if the motor speed is less than the set speed threshold value, the whole vehicle is allowed to jump from the pure lithium battery mode to the hybrid mode, and if the motor torque is less than the set torque threshold value, the whole vehicle is allowed to jump from the pure lithium battery mode to the hybrid mode.

[0027] As a preferred scheme of the power mode switching method of the transport vehicle, wherein:

[0028] In the hybrid mode, the vehicle controller collects the DCDC booster converter output power, the maximum allowable discharge power of the lithium ion battery, the maximum allowable charge power of the lithium ion battery, the total power requested by the vehicle and the rate of change, the drive motor power and the high-voltage accessory power signals in real time, and limits the DCDC booster converter output power, the drive motor power and the high-voltage accessory power to ensure smooth operation of the vehicle.

[0029] As a preferred scheme of the power mode switching method of the transport vehicle, wherein:

[0030] In the hybrid mode, the vehicle demand power control logic is represented as:

[0031] P DCDC +P dis ≥P M +P HV ≥P char -P DCDC

[0032] Wherein, P DCDC is the DCDC booster converter output power; P dis is the maximum allowable discharge power of the lithium ion battery; P M is the real-time demand power or feedback power of the drive motor; P HV is the real-time consumption power of the high-voltage accessory; P char is the maximum allowable charge power of the lithium ion battery.

[0033] In a second aspect, the present application provides a transport vehicle power mode switching system, comprising:

[0034] The division module divides the hydrogen fuel cell transport vehicle into two power modes: pure lithium battery mode and hybrid mode;

[0035] The control module switches between the two power modes through the fuel cell transport vehicle power mode entry and switching control process, and controls the power of the vehicle and high-voltage components to ensure the safe and stable operation of the fuel cell transport vehicle.

[0036] In a third aspect, the present application provides a computing device, comprising:

[0037] A memory for storing programs;

[0038] A processor for executing the computer executable instructions, which when executed by the processor implement the steps of the transport vehicle power mode switching method.

[0039] In a fourth aspect, the present application provides a computer readable storage medium comprising the program, which, when executed by a processor, implements the steps of the power mode switching method of the transport vehicle.

[0040] The present application has the following beneficial effects: The present application designs two power modes, namely, a pure lithium mode and a hybrid mode, and a control method for a hydrogen fuel cell transport vehicle, and the two power modes are switched under different conditions, the hydrogen fuel cell transport vehicle is reasonably controlled, and the safe and stable operation of the fuel cell transport vehicle is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0042] Figure 1 A basic flowchart of a transport vehicle power mode switching method provided by an embodiment of the present application is shown in the figure;

[0043] Figure 2 A fuel cell transport vehicle architecture diagram of a transport vehicle power mode switching method provided by an embodiment of the present application is shown in the figure;

[0044] Figure 3 A fuel cell transport vehicle power mode entry and switching control flowchart of a transport vehicle power mode switching method provided by an embodiment of the present application is shown in the figure; DETAILED DESCRIPTION

[0045] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings of the specification. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0046] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the scope of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0047] Second, the "one embodiment" or "an embodiment" referred to herein means a specific feature, structure, characteristic, or combination of features and characteristics described herein that can be included in at least one implementation of the present application. The various appearances of "in one embodiment" or "an embodiment" in the specification do not all refer to the same embodiment, although they can.

[0048] The present application is described in detail below in conjunction with the schematic drawings, and in the detailed description of the embodiments of the present application, the sectional view of the device structure is partially enlarged without the general proportion for the convenience of illustration, and the schematic drawings are only examples, which should not limit the scope of protection of the present application herein. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual production.

[0049] Meanwhile, in the description of the present application, it should be noted that the orientation or position relationship indicated by the terms "upper, lower, inner and outer" is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first, second or third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0050] Unless otherwise clearly specified and limited, the terms "mounting, connecting, connection" in the present application should be understood broadly, for example: it can be fixed connection, detachable connection or integral connection; it can also be mechanical connection, electrical connection or direct connection, it can also be indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Embodiment 1

[0052] Reference Figures 1-3 For one embodiment of the present application, a power mode switching method of a transport vehicle is provided, as shown in Figure 1 , which comprises:

[0053] S1: Dividing the hydrogen fuel cell transport vehicle into two power modes of pure lithium battery mode and hybrid mode;

[0054] S2: Switching the two power modes through the fuel cell transport vehicle power mode entering and switching control process, and controlling the power of the whole vehicle and high-voltage parts to ensure the safe and stable operation of the fuel cell transport vehicle.

[0055] Further, as shown in Figure 2The fuel cell transport vehicle structure of the application is shown: the fuel cell transport vehicle is provided with a hydrogen supply system, a hydrogen electrochemical reaction in the fuel cell generates electric energy, a DCDC booster converter boosts the direct current generated by the fuel cell into high-voltage direct current required by the whole vehicle for use by the driving motor and high-voltage accessories, and can charge the lithium ion battery. When the whole vehicle performs energy feedback, the lithium ion battery stores the generated electric energy.

[0056] The vehicle controller (VCU) communicates with the hydrogen supply system, the fuel cell, the DCDC booster converter, the driving motor and the high-voltage accessories in real time through the CAN network, and collects the state signal of the power mode switch through the hard wire. The VCU switches the whole vehicle into the corresponding appropriate power mode by analyzing and judging the input signal, and controls the whole vehicle reasonably.

[0057] Further, the VCU divides into two power modes of hybrid mode and pure lithium battery mode according to the opening and closing state (hydrogen consumption state) of the hydrogen fuel cell system:

[0058] 1) If the hydrogen fuel cell system is turned on (hydrogen is consumed), it is the hybrid mode;

[0059] 2) If the hydrogen fuel cell system is turned off (hydrogen is not consumed), it is the pure electric mode.

[0060] The fuel cell whole vehicle power mode entering and switching control method is shown as Figure 3 , which includes the following steps:

[0061] Step one: the VCU judges whether the whole vehicle has no prohibited power-on fault and the whole vehicle power-on condition has been triggered through the collected CAN signal and hard wire signal, if the above conditions are met, the whole vehicle sends a lithium ion battery high-voltage power-on instruction, if the above conditions are not met, the VCU prohibits the whole vehicle power-on;

[0062] Step two: under the premise of meeting step one, the VCU collects the lithium ion battery high-voltage power-on normal signal in real time, if the lithium ion battery high-voltage power-on is normal, it enters step three, otherwise it enters step one again;

[0063] Step three: under the premise of meeting step two, the VCU collects the fault information of the fuel cell and the hydrogen supply system in real time, if the fuel cell and the gas supply system have no more than 3 level faults (0 level: no fault of the part; 1 level: slight fault of the part; 2 level: whole vehicle power limiting fault; 3 level: whole vehicle parking fault; 4 level: whole vehicle emergency power-off fault, the fault severity increases from 0 to 4), it enters step four, otherwise the VCU directly enters the pure lithium battery mode and controls the whole vehicle according to the pure lithium battery mode;

[0064] Step four: under the premise of meeting step three, VCU collects through hardwire which mode the power mode switch is in, if the power mode switch is in hybrid mode, VCU sends lithium ion battery high voltage power-on instruction and enters step five, otherwise VCU directly enters pure lithium battery mode and controls the whole vehicle according to pure lithium battery mode;

[0065] Step five: under the premise of meeting step four, VCU collects real-time signals of whether fuel cell high voltage power-on is normal, if fuel cell high voltage power-on is normal, VCU sends opening hydrogen supply system instruction and enters step six, otherwise VCU directly enters pure lithium battery mode and controls the whole vehicle according to pure lithium battery mode;

[0066] Step six: under the premise of meeting step five, VCU collects real-time signals of opening state of hydrogen supply system, if opening of hydrogen supply system is normal, VCU enters hybrid mode and controls the whole vehicle according to hybrid mode.

[0067] In pure lithium battery mode, when the lithium battery power drops to the first set value, VCU needs to limit the power of the whole vehicle. When the lithium battery power drops to the second set value, VCU needs to do zero-torque processing to the whole vehicle.

[0068] During the whole vehicle driving process (vehicle speed ≥ threshold value or motor speed ≥ threshold value or motor torque ≥ threshold value), VCU does not allow the whole vehicle to jump from pure electric mode to hybrid mode, only under the condition that the whole vehicle stops driving (vehicle speed < threshold value or motor speed < threshold value or motor torque < threshold value, which can be calibrated), the whole vehicle is allowed to jump from pure electric mode to hybrid mode.

[0069] In hybrid mode, VCU collects real-time signals of DCDC booster converter output power, lithium ion battery maximum allowable discharge power, lithium ion battery maximum allowable charging power, whole vehicle request total power and change rate, driving motor power, high voltage accessory power, etc. By limiting DCDC booster converter output power, driving motor power and high voltage accessory power, the stable operation of the whole vehicle is ensured.

[0070] The whole vehicle demand power control logic in hybrid mode is:

[0071] P DCDC +P dis ≥P M +P HV ≥P char -P DCDC

[0072] Wherein, P DCDC is the output power of DCDC booster converter; P dis is the maximum allowable discharge power of lithium ion battery; P M is the real-time demand power or feedback power of driving motor; PHV P is the real-time consumed power of the high-voltage accessory char Pmax is the maximum allowed charging power of the lithium ion battery.

[0073] The embodiment also provides a power mode switching system of the transport vehicle, which comprises:

[0074] a division module, which divides the hydrogen fuel cell transport vehicle into two power modes, namely, a pure lithium battery mode and a hybrid mode;

[0075] a control module, which switches the two power modes through a fuel cell transport vehicle power mode entering and switching control process, and controls the power of the whole vehicle and high-voltage components, so as to ensure the safe and stable operation of the fuel cell transport vehicle.

[0076] Further, the embodiment also comprises:

[0077] a memory, which is used for storing a program;

[0078] a processor, which is used for loading the program to execute the transport vehicle power mode switching method.

[0079] The embodiment also provides a computer readable storage medium, which stores a program, and the program is executed by a processor to realize the transport vehicle power mode switching method.

[0080] The storage medium provided by the embodiment belongs to the same inventive concept as the transport vehicle power mode switching method provided by the above embodiment, and the technical details not described in the embodiment can be referred to the above embodiment, and the embodiment has the same beneficial effects as the above embodiment.

[0081] Through the above description of the embodiments, those skilled in the art can clearly understand that the present application can be realized by means of software and necessary general hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a floppy disk, a read-only memory (ROM), a random access memory (RAM), a FLASH memory, a hard disk or an optical disk, and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods of various embodiments of the present application.

[0082] Embodiment 2

[0083] Referring to Table 1, a transport vehicle power mode switching method is provided for an embodiment of the present application, and two schemes are provided for comparison to verify the beneficial effects thereof;

[0084] Method 1 is a pure lithium battery mode, and the transport vehicle uses the pure lithium battery mode for power supply. In the pure lithium battery mode, the power performance, response speed, cruising range and energy utilization efficiency of the vehicle are evaluated;

[0085] Method 2 is a hybrid mode, and the transport vehicle uses a fuel cell and lithium ion battery hybrid power system for power supply. In the hybrid mode, the power performance, response speed, cruising range and energy utilization efficiency of the vehicle are evaluated.

[0086] Method 3 is the method used in the present application;

[0087] Table 1 Comparison Table

[0088] Power performance Response speed Range Energy utilization efficiency Method 1 85 kW 4.2s 280 km 85％ Method 2 78 kW 3.8s 250 km 80％ Method 3 92 kW 3.5s 320 km 92％

[0089] As can be seen from Table 1, the transport vehicle power mode switching method processing and division are more detailed. Through the fuel cell transport vehicle power mode entry and switching control process, the switching of the pure lithium battery mode and the hybrid mode is realized, the reasonable collaborative control of the hydrogen fuel cell and the lithium ion battery is realized, and the power distribution and matching are optimized. In this way, the fast response characteristics of the lithium ion battery can be fully utilized to meet the high power demand of the vehicle under the conditions of sudden acceleration, sudden deceleration and braking, thereby improving the power performance and response speed of the vehicle.

[0090] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A method of switching power modes of a transport vehicle, characterized by, The application relates to a hydrogen fuel cell truck power mode switching control method. The hydrogen fuel cell truck is divided into a pure lithium battery mode and a hybrid mode; The power mode switching control method is used for switching the two power modes and controlling the power of the whole vehicle and high-voltage components, so as to ensure the safe and stable operation of the hydrogen fuel cell truck. If the hydrogen fuel cell system is started and hydrogen is consumed, the hydrogen fuel cell truck is in the hybrid mode; if the hydrogen fuel cell system is stopped and hydrogen is not consumed, the hydrogen fuel cell truck is in the pure lithium battery mode. In the hybrid mode, the whole vehicle demand power control logic is as follows: P DCDC +P dis ≥P M +P HV ≥P char -P DCDC Wherein, P DCDC is the DCDC boost converter output power; P dis is the maximum allowed discharge power of the lithium ion battery; P M is the real-time demand power or feedback power of the drive motor; P HV is the real-time consumption power of the high-voltage accessories; P char is the maximum allowed charging power of the lithium ion battery.

2. The method of claim 1, wherein: The power mode switching control method comprises the following steps: The vehicle controller collects CAN signals and hard-wire signals, judges whether there is a fault that prohibits power-on and whether the vehicle power-on condition has been triggered, sends a lithium ion battery high-voltage power-on instruction if there is no fault that prohibits power-on and the vehicle power-on condition has been triggered, and judges whether the lithium ion battery high-voltage power-on signal is normal; if there is a fault that prohibits power-on and the vehicle power-on condition has not been triggered, the vehicle controller prohibits the vehicle power-on. The vehicle controller collects the lithium ion battery high-voltage power-on signal in real time, judges whether the lithium ion battery high-voltage power-on signal is normal, judges the fault level of the fuel cell and hydrogen supply system if the lithium ion battery high-voltage power-on signal is normal, and returns to the step of judging whether there is a fault that prohibits power-on and whether the vehicle power-on condition has been triggered if the lithium ion battery high-voltage power-on signal is abnormal. The vehicle controller collects the fault information of the fuel cell and hydrogen supply system in real time, judges the fault level of the fuel cell and hydrogen supply system, judges the current mode of the power mode switch if no more than 3-level faults are found in the fuel cell and hydrogen supply system, directly enters the pure lithium battery mode if more than 3-level faults are found in the fuel cell and hydrogen supply system, and controls the whole vehicle according to the pure lithium battery mode. The vehicle controller judges the current mode of the power mode switch through hard-wire collection, sends a lithium ion battery high-voltage power-on instruction if the power mode switch is in the hybrid mode, judges whether the fuel cell high-voltage power-on signal is normal, directly enters the pure lithium battery mode if the power mode switch is not in the hybrid mode, and controls the whole vehicle according to the pure lithium battery mode. The vehicle controller collects the fuel cell high-voltage power-on signal in real time, judges whether the fuel cell high-voltage power-on signal is normal, sends an instruction to start the hydrogen supply system if the fuel cell high-voltage power-on signal is normal, judges whether the hydrogen supply system is started normally, directly enters the pure lithium battery mode if the fuel cell high-voltage power-on signal is abnormal, and controls the whole vehicle according to the pure lithium battery mode. The whole vehicle controller collects the hydrogen supply system opening state signal in real time, judges whether the hydrogen supply system opening is in a normal state, if the hydrogen supply system opening is in the normal state, the whole vehicle controller sends a fuel cell start-up instruction and judges whether the fuel cell start-up is in a normal state; if the hydrogen supply system opening is in an abnormal state, the whole vehicle controller directly enters a pure lithium battery mode, and controls the whole vehicle according to the pure lithium battery mode; The whole vehicle controller collects the fuel cell start-up state signal in real time, judges whether the fuel cell start-up is in a normal state, if the fuel cell start-up is in the normal state, the whole vehicle controller enters a hybrid mode, and controls the whole vehicle according to the hybrid mode; if the fuel cell start-up is in an abnormal state, the whole vehicle controller directly enters the pure lithium battery mode, and controls the whole vehicle according to the pure lithium battery mode.

3. The method of claim 2, wherein: The fuel cell and the hydrogen supply system fault level are judged, and the fault level is divided into five levels, 0 level is no fault of the part, 1 level is slight fault of the part, 2 level is whole vehicle power limiting fault, 3 level is whole vehicle stopping fault, and 4 level is whole vehicle emergency power-off fault, and the fault severity increases from 0 level to 4 level.

4. The method of claim 3, wherein: The whole vehicle and high-voltage part power are controlled, if the vehicle speed is greater than or equal to a set vehicle speed threshold value, the whole vehicle is prohibited from jumping from the pure lithium battery mode to the hybrid mode; if the motor speed is greater than or equal to a set speed threshold value, the whole vehicle is prohibited from jumping from the pure lithium battery mode to the hybrid mode; If the motor torque is greater than or equal to a set torque threshold value, the whole vehicle is prohibited from jumping from the pure lithium battery mode to the hybrid mode; If the vehicle speed is less than the set vehicle speed threshold value, the whole vehicle is allowed to jump from the pure lithium battery mode to the hybrid mode; if the motor speed is less than the set speed threshold value, the whole vehicle is allowed to jump from the pure lithium battery mode to the hybrid mode; If the motor torque is less than the set torque threshold value, the whole vehicle is allowed to jump from the pure lithium battery mode to the hybrid mode.

5. The method of claim 4, wherein: In the hybrid mode, the whole vehicle controller collects the DCDC booster converter output power, the lithium ion battery maximum allowable discharge power, the lithium ion battery maximum allowable charge power, the whole vehicle request total power and change rate, the driving motor power and the high-voltage accessory power signal in real time, and the whole vehicle is guaranteed to run smoothly by limiting the DCDC booster converter output power, the driving motor power and the high-voltage accessory power.

6. A transport vehicle power mode switching system characterized by, The transportation vehicle power mode switching method comprises the following steps: A division module divides the hydrogen fuel cell transportation vehicle into two power modes, namely a pure lithium battery mode and a hybrid mode; A control module switches the two power modes through a fuel cell transportation vehicle power mode entering and switching control process, controls the whole vehicle and high-voltage part power, and guarantees the safe and stable operation of the fuel cell transportation vehicle.

7. An electronic device, comprising: It comprises: A memory for storing a program; A processor for loading the program to execute the transportation vehicle power mode switching method according to any one of claims 1-5.

8. A computer-readable storage medium storing a program, characterized in that, The program is executed by the processor to realize the transportation vehicle power mode switching method according to any one of claims 1-5. The program is executed by the processor to realize the transportation vehicle power mode switching method according to any one of claims 1-5.

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