Energy management method, system and equipment of fuel cell vehicle and medium

Abstract

The invention discloses an energy management method, system and equipment of a fuel cell vehicle and a medium. The method comprises the following steps: monitoring a current environment temperature in real time to switch an energy management mode of a fuel cell system; obtaining the required power of the whole vehicle and the SOC value of the power battery, and controlling the fuel cell system to output power through a preset fuzzy rule; and controlling the fuel cell system to charge the power cell according to the energy management mode and the SOC value so as to stably provide power for the fuel cell vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cell vehicles, and in particular to an energy management method, system, equipment and medium for a fuel cell vehicle. Background Art

[0002] As a new energy vehicle, the energy source of fuel cell vehicles includes two parts: one part of the energy source is a power battery, such as a lithium battery, which can be charged and discharged; the other part of the energy source is a fuel cell power system based on hydrogen. Among them, when providing power to the fuel cell electric vehicle to start the fuel cell vehicle, the power battery is used to start the fuel cell power system, and then the power battery and the fuel cell power system together provide power for the entire vehicle, forming an electric-electric hybrid power system.

[0003] In the prior art, when the fuel cell power system and the power battery are energy managed to provide power for the automobile, in order to maintain the SOC of the power battery in a healthy state to extend the service life of the power battery, the existing energy management method often calculates the output power of the fuel cell power system based on the vehicle power demand of the fuel cell vehicle and the SOC value of the power battery, so as to avoid the SOC value of the power battery being too low and thus affecting the health state while meeting the vehicle power demand.

[0004] However, the above energy management method does not take into account that the power battery is easily affected by low temperature and that repeated starts of the fuel cell vehicle consume power of the power battery. As a result, when the fuel cell vehicle is started, if the SOC of the power battery is too low and the ambient temperature is too low, the fuel cell cannot be started, thereby reducing the reliability and stability of the hybrid power system of the fuel cell vehicle. Summary of the invention

[0005] In order to solve the above technical problems, the present invention discloses an energy management method, system, device and medium for a fuel cell vehicle, which are used to stably provide power to the fuel cell vehicle.

[0006] In order to achieve the above objectives, in a first aspect, the present invention discloses an energy management method for a fuel cell vehicle, comprising:

[0007] Real-time monitoring of the current ambient temperature to switch the energy management mode of the fuel cell system;

[0008] Obtain the vehicle's required power and the SOC value of the power battery to control the fuel cell system to output power through preset fuzzy rules;

[0009] According to the energy management mode and the SOC value, the fuel cell system is controlled to charge the power battery.

[0010] The present invention discloses an energy management method for a fuel cell vehicle. First, the energy management mode of the fuel cell system is switched according to the current ambient temperature of the fuel cell vehicle, thereby avoiding the influence of low temperature on the fuel cell and improving the stability of the fuel cell system. Furthermore, when determining the output power of the fuel cell, the fuel cell system is controlled to output power according to the power demand of the whole vehicle and the current SOC value of the power battery through a preset fuzzy rule, which not only meets the power demand of the whole vehicle, but also ensures that the power battery is maintained in a healthy state to improve the stability of the power battery. Finally, after controlling the fuel cell to output power, the power battery is charged according to the energy management mode and the SOC value to prevent the power battery from being too low and unable to start next time, thereby ensuring the stable output power of the fuel cell system and providing stable power to the fuel cell vehicle.

[0011] As a preferred example, the real-time monitoring of the current ambient temperature to switch the energy management mode of the fuel cell system includes:

[0012] Get the current ambient temperature in real time;

[0013] When the current ambient temperature is lower than or equal to a preset first temperature threshold, controlling the fuel cell system to execute a low temperature management mode;

[0014] When the current ambient temperature is higher than a preset first temperature threshold, the fuel cell system is controlled to execute a normal management mode.

[0015] The present invention switches the energy management mode of the fuel cell system according to the current ambient temperature of the vehicle, so that the power battery can be subsequently charged according to the energy management mode, avoiding the situation where the power battery cannot be started due to low temperature or low power, thereby improving the stability of the fuel cell system.

[0016] As a preferred example, the control of the fuel cell system output power by a preset fuzzy rule includes:

[0017] The vehicle demand power is fuzzy processed to match the vehicle demand power with a plurality of preset power intervals respectively, and a target power interval corresponding to the vehicle demand power is obtained;

[0018] Obtain the required power level corresponding to the target power range.

[0019] The present invention utilizes fuzzy rules to simply classify the current vehicle power demand, so that the output power corresponding to the fuel cell system can be quickly matched according to the classified levels, thereby improving the efficiency of energy management.

[0020] As a preferred example, the control of the output power of the fuel cell system by a preset fuzzy rule includes:

[0021] Matching the SOC value with a plurality of preset SOC intervals respectively to obtain a target SOC interval corresponding to the SOC value;

[0022] The SOC level corresponding to the target SOC range is obtained.

[0023] The present invention considers the SOC value of the power battery when determining the output power of the fuel cell system to keep the power battery in a healthy state as much as possible. Furthermore, in the process of power calculation, the current SOC value is simply graded using fuzzy rules so that the output power corresponding to the fuel cell system can be quickly matched according to the grade, thereby improving the efficiency of energy management.

[0024] As a preferred example, the control of the output power of the fuel cell system by a preset fuzzy rule includes:

[0025] Determining an output power level of the fuel cell system according to the required power level and the SOC level;

[0026] An output power interval corresponding to the output power level is obtained, and a defuzzification process is performed on the output power interval to determine a target output power of the fuel cell system.

[0027] The present invention utilizes the required power level and SOC level of the whole vehicle to quickly match it to a preset output power range, and defuzzifies the output power range to obtain a specific target output power, thereby meeting the power demand of the whole vehicle and the health requirements of the power battery according to the target output power.

[0028] As a preferred example, the controlling the fuel cell system to charge the power battery includes:

[0029] When the energy management mode is the low temperature management mode, comparing the current ambient temperature with a preset second temperature threshold and comparing the SOC value of the power battery with a preset SOC threshold;

[0030] When the current ambient temperature is lower than the second temperature threshold and the SOC value is less than the SOC threshold, the fuel cell system is controlled to charge the power battery.

[0031] When the present invention determines that the energy management mode is the low-temperature management mode, in order to avoid the power battery being unable to start due to the influence of low temperature, it determines whether to charge the power battery according to the current ambient temperature and the SOC value corresponding to the power battery, so that the power of the power battery is maintained within a range that can be started normally, thereby improving the stability of the fuel cell system.

[0032] As a preferred example, the controlling the fuel cell system to charge the power battery includes:

[0033] Filter out the intermediate output power level from the output power level of the fuel cell system; wherein the output power level includes the lowest output power level, the intermediate output power level and the highest output power level; the lowest output power level is less than the intermediate output power level and the intermediate output power level is less than the highest output power level

[0034] The fuel cell system is controlled to charge the power battery according to the output power corresponding to the intermediate output power level.

[0035] After determining that the power battery is to be charged, that is, the fuel cell system is not shut down, the present invention will charge the power battery at high power, and increase the SOC of the power battery to a healthy power level at a relatively fast speed and with a safe current to ensure that the next fuel cell can be cold started normally.

[0036] In a second aspect, the present invention discloses an energy management system for a fuel cell vehicle, including a temperature monitoring module, a power output module and a battery charging module;

[0037] The temperature monitoring module is used to monitor the current ambient temperature in real time to switch the energy management mode of the fuel cell system;

[0038] The power output module is used to obtain the required power of the vehicle and the SOC value of the power battery, so as to control the fuel cell system to output power through a preset fuzzy rule;

[0039] The battery charging module is used to control the fuel cell system to charge the power battery according to the energy management mode and the SOC value.

[0040] The present invention discloses an energy management system for a fuel cell vehicle. First, the energy management mode of the fuel cell system is switched according to the current ambient temperature of the fuel cell vehicle, thereby avoiding the influence of low temperature on the fuel cell and improving the stability of the fuel cell system. Furthermore, when determining the output power of the fuel cell, the fuel cell system is controlled to output power according to the power demand of the whole vehicle and the current SOC value of the power battery through a preset fuzzy rule, which not only meets the power demand of the whole vehicle, but also ensures that the power battery is maintained in a healthy state, so as to improve the stability of the power battery. Finally, after controlling the fuel cell to output power, the power battery is charged according to the energy management mode and the SOC value to prevent the power battery from being too low and unable to start next time, thereby improving the stability and reliability of the fuel cell system.

[0041] In a third aspect, the present invention discloses an electronic device comprising: at least one processor; and a memory communicatively connected to at least one of the processors; wherein the memory stores instructions executable by at least one of the processors, and the instructions are executed by at least one of the processors so that at least one of the processors can execute an energy management method for a fuel cell vehicle as described in the first aspect.

[0042] In a fourth aspect, the present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the energy management method for a fuel cell vehicle as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 : A schematic flow chart of an energy management method for a fuel cell vehicle disclosed in an embodiment of the present invention;

[0044] Figure 2 : A schematic diagram of the structure of an energy management system for a fuel cell vehicle disclosed in an embodiment of the present invention;

[0045] Figure 3 : A schematic flow chart of an energy management method for a fuel cell vehicle disclosed in another embodiment of the present invention;

[0046] Figure 4 : A schematic diagram of the structure of a power system disclosed in another embodiment of the present invention;

[0047] Figure 5 : A schematic diagram of a fuzzy rule disclosed in another embodiment of the present invention;

[0048] Figure 6 : A schematic diagram of a vehicle power requirement disclosed in another embodiment of the present invention;

[0049] Figure 7 : A schematic diagram of SOC change of a power battery disclosed in another embodiment of the present invention;

[0050] Figure 8 : A schematic diagram of output power of a fuel cell system disclosed in another embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Embodiment 1

[0053] This embodiment discloses an energy management method for a fuel cell vehicle, which is used to stably provide power to the fuel cell vehicle. Figure 1 , mainly including steps 101 to 103, wherein the steps are mainly:

[0054] Step 101: monitor the current ambient temperature in real time to switch the energy management mode of the fuel cell system.

[0055] In this embodiment, the steps are mainly as follows: obtaining the current ambient temperature in real time; when the current ambient temperature is lower than or equal to the preset first temperature threshold, controlling the fuel cell system to execute the low temperature management mode; when the current ambient temperature is higher than the preset first temperature threshold, controlling the fuel cell system to execute the normal management mode.

[0056] In this embodiment, this step switches the energy management mode of the fuel cell system according to the current ambient temperature of the vehicle, so that the power battery can be charged according to the energy management mode subsequently, avoiding the power battery being unable to start due to low temperature or low power, thereby improving the stability of the fuel cell system.

[0057] Step 102: Obtain the required power of the entire vehicle and the SOC value of the power battery, so as to control the fuel cell system to output power through a preset fuzzy rule.

[0058] In this embodiment, the step mainly includes: fuzzy processing the vehicle power demand to match it with multiple preset power intervals respectively, and obtain the target power interval corresponding to the vehicle power demand; obtain the demand power level corresponding to the target power interval.

[0059] At the same time, the SOC value is matched with a plurality of preset SOC intervals respectively to obtain a target SOC interval corresponding to the SOC value; and an SOC level corresponding to the target SOC interval is obtained.

[0060] Furthermore, the output power level of the fuel cell system is determined based on the required power level and the SOC level; an output power range corresponding to the output power level is obtained, and the output power range is defuzzified to determine the target output power of the fuel cell system.

[0061] In this embodiment, this step uses fuzzy rules to simply classify the current vehicle power demand and SOC value, so that the subsequent classification can be quickly matched to the corresponding output power of the fuel cell system, thereby improving the efficiency of energy management. At the same time, the vehicle's power demand level and SOC level are used to quickly match the preset output power range, and the output power range is defuzzified to obtain a specific target output power, and then the power demand of the vehicle and the health requirements of the power battery are met according to the target output power.

[0062] Step 103: According to the energy management mode and the SOC value, control the fuel cell system to charge the power battery.

[0063] In this embodiment, the step mainly includes: when the energy management mode is the low temperature management mode, comparing the current ambient temperature with the preset second temperature threshold and comparing the SOC value of the power battery with the preset SOC threshold; when the current ambient temperature is lower than the second temperature threshold and the SOC value is less than the SOC threshold, controlling the fuel cell system to charge the power battery.

[0064] Furthermore, an intermediate output power level is screened out from the output power levels of the fuel cell system; wherein the output power levels include a minimum output power level, an intermediate output power level and a maximum output power level; the minimum output power level is less than the intermediate output power level and the intermediate output power level is less than the maximum output power level; and the fuel cell system is controlled to charge the power battery according to the output power corresponding to the intermediate output power level.

[0065] In this embodiment, when the energy management mode is determined to be the low temperature management mode, in order to prevent the power battery from being unable to start due to the influence of low temperature, it is determined whether to charge the power battery according to the current ambient temperature and the SOC value corresponding to the power battery, so that the power of the power battery is maintained within a range that can be started normally, thereby improving the stability of the fuel cell system. After it is determined that the power battery is charged, that is, the fuel cell system does not shut down, the power battery will be charged at high power, and the SOC of the power battery will be pulled to a healthy power level at a faster speed and safe current to ensure the normal cold start of the fuel cell next time.

[0066] On the other hand, this embodiment also discloses an energy management system for a fuel cell vehicle. For the specific structure of the energy management system, please refer to Figure 2 , including a temperature monitoring module 201, a power output module 202 and a battery charging module 203.

[0067] The temperature monitoring module 201 is used to monitor the current ambient temperature in real time to switch the energy management mode of the fuel cell system.

[0068] The power output module 202 is used to obtain the required power of the whole vehicle and the SOC value of the power battery, so as to control the fuel cell system to output power through a preset fuzzy rule.

[0069] The battery charging module 203 is used to control the fuel cell system to charge the power battery according to the energy management mode and the SOC value.

[0070] In this embodiment, the temperature monitoring module 201 includes a data acquisition unit and a mode switching unit.

[0071] The data acquisition unit is used to acquire the current ambient temperature in real time.

[0072] The mode switching unit is used to control the fuel cell system to execute a low temperature management mode when the current ambient temperature is lower than or equal to a preset first temperature threshold; and to control the fuel cell system to execute a normal management mode when the current ambient temperature is higher than the preset first temperature threshold.

[0073] In this embodiment, the power output module 202 includes a power level division unit, a power level division unit and a power output unit.

[0074] The power level division unit is used to fuzzy process the vehicle demand power to match it with multiple preset power intervals respectively, obtain the target power interval corresponding to the vehicle demand power; and obtain the demand power level corresponding to the target power interval.

[0075] The power level division unit is used to match the SOC value with a plurality of preset SOC intervals respectively to obtain a target SOC interval corresponding to the SOC value; and obtain an SOC level corresponding to the target SOC interval.

[0076] The power output unit is used to determine the output power level of the fuel cell system according to the required power level and the SOC level; obtain the output power range corresponding to the output power level, and defuzzify the output power range to determine the target output power of the fuel cell system.

[0077] In this embodiment, the battery charging module 203 includes a charging determination unit and a charging output unit.

[0078] The charging determination unit is used to compare the current ambient temperature with a preset second temperature threshold and to compare the SOC value of the power battery with a preset SOC threshold when the energy management mode is the low temperature management mode; when the current ambient temperature is lower than the second temperature threshold and the SOC value is lower than the SOC threshold, control the fuel cell system to charge the power battery.

[0079] The charging output unit is used to select the highest output power level from the output power levels of the fuel cell system; and control the fuel cell system to charge the power battery according to the output power corresponding to the highest output power level.

[0080] According to Figure 1 The energy management method of the fuel cell vehicle shown in the embodiment, accordingly, this embodiment provides an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the following when executing the computer program Figure 1The energy management method of the fuel cell vehicle shown in the figure. The processor may be a central processing unit (CPU), other general processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal, and various interfaces and lines are used to connect the various parts of the entire terminal. The memory may be used to store the computer program, and the processor realizes various functions of the terminal by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Med ia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0081] Furthermore, this embodiment also provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the following Figure 1 The energy management method of the fuel cell vehicle is shown.

[0082] Among them, Figure 2If the energy management system of the fuel cell vehicle shown is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-mentioned embodiment method can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0083] Compared with the prior art, this embodiment provides the following beneficial effects:

[0084] The present embodiment discloses an energy management method, system, device and medium for a fuel cell vehicle. First, the energy management mode of the fuel cell system is switched according to the current ambient temperature of the fuel cell vehicle, thereby avoiding the influence of low temperature on the fuel cell and improving the stability of the fuel cell system. Furthermore, when determining the output power of the fuel cell, the fuel cell system is controlled to output power according to the power demand of the whole vehicle and the current SOC value of the power battery through a preset fuzzy rule, which not only meets the power demand of the whole vehicle, but also ensures that the power battery is maintained in a healthy state to improve the stability of the power battery. Finally, after controlling the fuel cell to output power, the power battery is charged according to the energy management mode and the SOC value to prevent the power battery from being too low and unable to start the next time, thereby improving the stability and reliability of the fuel cell system.

[0085] Embodiment 2

[0086] With the development of fuel cell vehicles, when controlling the fuel cell system to provide corresponding power for the vehicle to start the vehicle, the existing technology makes a mapping curve according to the power demand of the vehicle and the SOC value of the power battery, and then formulates the output power of the fuel cell system according to the mapping curve. However, at each start-up, if the external ambient temperature is too low or the SOC value of the power battery is too low, the fuel cell system may not start normally, and thus fail to provide power to the vehicle normally.

[0087] In order to solve the above technical problems and stably provide power to the fuel cell vehicle, this embodiment provides an energy management method for a fuel cell vehicle. The specific implementation process of the method can be referred to Figure 3 , mainly including steps 301 to 304, the steps are mainly:

[0088] Step 301: The fuel cell system controller responds to the control command of the fuel cell vehicle to obtain the current ambient temperature according to the control command and switch the energy management mode of the fuel cell system.

[0089] In this embodiment, the steps are mainly as follows: the fuel cell system controller determines whether the fuel cell system needs to output power according to the control command; when it is determined that the fuel cell system needs to output power, the current ambient temperature is obtained, and the current ambient temperature is compared with a preset temperature threshold to determine the energy management mode corresponding to the fuel cell system; wherein the energy management mode includes a low temperature management mode and a normal management mode.

[0090] Specifically, in certain implementations of this embodiment, the power system of the fuel cell vehicle is as follows: Figure 4 As shown, it includes FCU, i.e., fuel cell system controller, fuel cell system, lithium battery, DC / DC, and the power required by the fuel cell vehicle is provided by hydrogen fuel cells and lithium batteries. The output power of the hydrogen fuel cell system is determined by the power required by the vehicle and the SOC of the lithium battery. Through continuous experiments on the power batteries in fuel cell vehicles, it can be seen that as the temperature decreases, the performance of the power battery gradually decreases, and long-term use in a low temperature environment will accelerate the aging of the power battery and shorten its service life. In the course of the experiment, it was found that the capacity and operating voltage of the commonly used lithium-ion power batteries of electric vehicles will be significantly reduced at -5°C, and the performance will deteriorate further at -20°C, and can only maintain about 30% of the capacity at room temperature. In this regard, in a certain embodiment, according to the experimental process, the temperature threshold is set to -5°C to prevent the power battery from being affected by low temperature.

[0091] Taking the above -5℃ as an example, the fuel cell system first obtains the ambient temperature. If the ambient temperature is lower than -5℃, it enters the low temperature energy management mode, otherwise it enters the normal energy management mode. The difference between the low temperature energy management mode and the normal energy management mode is that when the fuel cell system is in the normal energy management mode, the fuel cell system controller controls the fuel cell system to output the corresponding power and then stops the power output, that is, the fuel cell system is in a shutdown state. When the fuel cell system is in the low temperature energy management mode, the fuel cell system controller controls the fuel cell system to output the corresponding power and then determines whether to charge the power battery, that is, the fuel cell system is shut down after charging the power battery.

[0092] Step 302: The fuel cell system controller obtains the required power of the entire vehicle and the current SOC value of the power battery according to the control command, so as to determine the output power of the fuel cell system through a preset fuzzy rule.

[0093] In this embodiment, this step mainly includes: the fuel cell system controller obtains the required power level corresponding to the vehicle's required power and the SOC level corresponding to the current SOC value according to a preset fuzzy rule, and formulates the output power of the fuel cell system according to the required power level and the SOC level.

[0094] Specifically, in certain implementations of this embodiment, the fuel cell system controller communicates with the vehicle controller and the power battery management system of the fuel cell vehicle according to the control command to send a frame of signal about requesting power and requesting SOC value, and then obtains the vehicle's required power fed back by the vehicle controller and the current SOC value corresponding to the power battery fed back by the power battery management system.

[0095] Furthermore, the fuel cell system controller outputs the vehicle power demand and the current SOC value to a pre-built fuzzy controller, so that the fuzzy controller calculates the current fuel cell system output power by combining the vehicle power demand and the SOC value through a pre-built first fuzzy rule. Among them, the fuzzy rule converts each input variable into a fuzzy set through a fuzzification process, for example, dividing the temperature into three categories: "low", "medium" and "high". Then, the corresponding output set is obtained based on these fuzzy sets and preset data matching rules. For example: "If the vehicle power demand is high and the SOC value is low, the output power is high". These fuzzy outputs are then converted into specific control signals, such as the actual output power setting, through a defuzzification process. Specifically, the fuzzy rules are as follows: Figure 5 shown.

[0096] Preferably, in certain implementations of the present embodiment, the specific content of setting the first fuzzy rule is: if the current SOC is L and the vehicle power demand is NL, the fuel cell system output power is L2; ​​if the SOC is L and the vehicle power demand is L, the fuel cell system output power is L3; if the SOC is L and the vehicle power demand is M, the fuel cell system output power is L4; if the SOC is L and the vehicle power demand is H, the fuel cell system output power is L5; if the SOC is L and the vehicle power demand is pH, the fuel cell system output power is L5; if the SOC is M and the vehicle power demand is NL, the fuel cell system output power is L2; ​​if the SOC is M and the vehicle power demand is L, the fuel cell system output power is L 2; if the SOC is M and the vehicle power demand is M, the fuel cell system output power is L3; if the SOC is M and the vehicle power demand is H, the fuel cell system output power is L4; if the SOC is M and the vehicle power demand is pH, the fuel cell system output power is L2; ​​if the SOC is H and the vehicle power demand is NL, the fuel cell system output power is L0; if the SOC is H and the vehicle power demand is L, the fuel cell system output power is L1; if the SOC is H and the vehicle power demand is M, the fuel cell system output power is L2; ​​if the SOC is H and the vehicle power demand is H, the fuel cell system output power is L3; if the SOC is H and the vehicle power demand is pH, the fuel cell system output power is L4.

[0097] Specifically, the interval division corresponding to each level is formulated according to the level division of the SOC value setting in the fuzzy rule and the level division of the vehicle required power. For example, in some implementations of this embodiment, in the division interval corresponding to each level of the SOC, the L represents that when the SOC is a low level, the range is [0 0.3 0.4], M represents that when the SOC is a medium level, the range is [0.35 0.5 0.7], and H represents that when the SOC is a high level, the range is [0.65 0.85 1], and the actual SOC value corresponding to the range corresponds to x*100%, and x represents the value within the range.

[0098] Similarly, referring to the above-mentioned classification of SOC levels, NL represents the lowest level of vehicle power demand, and the range is [0 0 0]; L represents the low level of vehicle power demand, and the range is [0 2 4]; M represents the medium level of vehicle power demand, and the range is [3 5 7]; H represents the high level of vehicle power demand, and the range is [6 810]; PH represents the highest level of vehicle power demand, and the range is [9 10 35]; and the unit of the actual power demand value within the range is kilowatt.

[0099] Finally, according to the classification of SOC and the classification of vehicle power demand, L0 to L5 represent the classification of fuel cell system output power. Specifically, the range is L0[0 00], L1[0.4 0.4 0.4], L2[0.4 1 4], L3[3 5 7], L4[6 8 10], L5[8 9.5 10]. The unit of the fuel cell system output power corresponding to the range is kilowatt.

[0100] Step 303: The fuel cell system controller charges the power battery according to the energy management mode.

[0101] In this embodiment, the steps are as follows: after the fuel cell system controller controls the fuel cell system to output power, it determines whether the power battery needs to be charged according to the energy management mode. After it is determined that the power battery needs to be charged, the charging power required for the power battery is determined according to the SOC value of the power battery and the current ambient temperature, and the charging power is used as the output power of the fuel cell system.

[0102] Specifically, when the fuel cell system controller determines that the current corresponding energy management mode is the low-temperature energy mode, it determines whether it needs to be charged according to the current SOC value and the current ambient temperature. Among them, referring to the experiment on the power battery in the above steps, it can be seen that in order to reduce the impact of low temperature on the power battery, the temperature threshold for shutdown judgment can be set higher than the temperature threshold in the energy management mode. In this regard, the temperature threshold for shutdown judgment can be set to 0°C. Similarly, it can be obtained from experiments on the power battery that when the SOC of the power battery is lower than 30%, the corresponding state is unhealthy. Therefore, the SOC threshold for shutdown judgment is set to 30% in this embodiment.

[0103] In certain implementations of this embodiment, when the fuel cell system controller determines that the ambient temperature is lower than 0°C and the SOC of the power battery is lower than 30%, the fuel cell system controller will control the fuel cell system to not shut down, and control the fuel cell system to charge the power battery at high power, and pull the SOC of the power battery to a healthy power level at a faster speed and safe current to ensure the next normal cold start of the fuel cell. Specifically, when formulating the charging power of the fuel cell system to the power battery, the fuel cell system controller obtains the output power corresponding to the current fuel cell system according to the second fuzzy rule set in the fuzzy controller. Specifically, the specific content of setting the first fuzzy rule is: if the current SOC is L and the vehicle power demand is NL, the fuel cell system output power is L3; if the SOC is L and the vehicle power demand is L, the fuel cell system output power is L3; if the SOC is L and the vehicle power demand is M, the fuel cell system output power is L4; if the SOC is L and the vehicle power demand is H, the fuel cell system output power is L5; if the SOC is L and the vehicle power demand is pH, the fuel cell system output power is L5; if the SOC is M and the vehicle power demand is NL, the fuel cell system output power is L2; ​​if the SOC is M and the vehicle power demand is L, the fuel cell system output power is L2; If C is M and the vehicle power demand is M, the fuel cell system output power is L3; if SOC is M and the vehicle power demand is H, the fuel cell system output power is L4; if SOC is M and the vehicle power demand is pH, the fuel cell system output power is L2; ​​if SOC is H and the vehicle power demand is NL, the fuel cell system output power is L0; if SOC is H and the vehicle power demand is L, the fuel cell system output power is L1; if SOC is H and the vehicle power demand is M, the fuel cell system output power is L2; ​​if SOC is H and the vehicle power demand is H, the fuel cell system output power is L3; if SOC is H and the vehicle power demand is pH, the fuel cell system output power is L4. Specifically, the interval corresponding to the level division of the SOC value setting, the interval corresponding to the level division of the vehicle power demand, and the interval corresponding to the level division of the fuel cell system output power are the same as the first fuzzy rule.

[0104] Specifically, in some implementations of this embodiment, the energy management method described in this embodiment is verified by a simulation method. Specifically, during the simulation process, first refer to Figure 6 is the vehicle power requirement input during the simulation. Figure 6 In the vehicle power requirement shown, the lower part is the real-time power requirement of the forklift, and the upper part is calculated by smoothing filtering. Figure 7 The SOC of the power battery input in the simulation process changes during operation, and then according to Figure 6 and Figure 7 The vehicle demand power and the power battery SOC value shown in FIG. 1 are simulated by the energy management method described in this embodiment, and it can be seen that the fuel-electric output power obtained by the fuzzy controller is as follows: Figure 8 As shown. Figure 8 It can be seen that under normal energy management mode, the fuel cell system keeps the power battery SOC stable at around 70%, thus meeting the power requirements of the entire vehicle.

[0105] As can be seen from the simulation shown in the above embodiment, the energy management method for a fuel cell vehicle disclosed in the present embodiment stabilizes the SOC of the power battery at about 80% under the normal energy management mode, thereby improving the life of the power battery. In the low-temperature energy management mode, the SOC of the power battery is stabilized at about 30%, thereby preventing the power system from failing to start next time, thereby improving the stability and reliability of the fuel cell system.

[0106] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for energy management of a fuel cell vehicle, characterized in that: include: Real-time monitoring of the current ambient temperature to switch the energy management mode of the fuel cell system; Obtain the vehicle's required power and the SOC value of the power battery to control the fuel cell system to output power through preset fuzzy rules; According to the energy management mode and the SOC value, the fuel cell system is controlled to charge the power battery.

2. The energy management method for a fuel cell vehicle according to claim 1, characterized in that: The real-time monitoring of the current ambient temperature to switch the energy management mode of the fuel cell system includes: Get the current ambient temperature in real time; When the current ambient temperature is lower than or equal to a preset first temperature threshold, controlling the fuel cell system to execute a low temperature management mode; When the current ambient temperature is higher than a preset first temperature threshold, the fuel cell system is controlled to execute a normal management mode.

3. The energy management method for a fuel cell vehicle according to claim 1, characterized in that: The method of controlling the output power of the fuel cell system by using a preset fuzzy rule includes: The vehicle demand power is fuzzy processed to match the vehicle demand power with a plurality of preset power intervals respectively, and a target power interval corresponding to the vehicle demand power is obtained; Obtain the required power level corresponding to the target power range.

4. The energy management method for a fuel cell vehicle according to claim 1, characterized in that: The method of controlling the output power of the fuel cell system by using a preset fuzzy rule includes: Matching the SOC value with a plurality of preset SOC intervals respectively to obtain a target SOC interval corresponding to the SOC value; The SOC level corresponding to the target SOC range is obtained.

5. The energy management method for a fuel cell vehicle according to any one of claims 3 to 4, characterized in that: The method of controlling the output power of the fuel cell system by using a preset fuzzy rule includes: Determining an output power level of the fuel cell system according to the required power level and the SOC level; An output power interval corresponding to the output power level is obtained, and a defuzzification process is performed on the output power interval to determine a target output power of the fuel cell system.

6. The energy management method for a fuel cell vehicle according to claim 2, characterized in that: The controlling the fuel cell system to charge the power battery includes: When the energy management mode is the low temperature management mode, comparing the current ambient temperature with a preset second temperature threshold and comparing the SOC value of the power battery with a preset SOC threshold; When the current ambient temperature is lower than the second temperature threshold and the SOC value is less than the SOC threshold, the fuel cell system is controlled to charge the power battery.

7. The energy management method for a fuel cell vehicle according to claim 6, characterized in that: The controlling the fuel cell system to charge the power battery includes: Filter out the intermediate output power level from the output power level of the fuel cell system; wherein the output power level includes the lowest output power level, the intermediate output power level and the highest output power level; the lowest output power level is less than the intermediate output power level and the intermediate output power level is less than the highest output power level The fuel cell system is controlled to charge the power battery according to the output power corresponding to the intermediate output power level.

8. An energy management system for a fuel cell vehicle, characterized in that: Including temperature monitoring module, power output module and battery charging module; The temperature monitoring module is used to monitor the current ambient temperature in real time to switch the energy management mode of the fuel cell system; The power output module is used to obtain the required power of the vehicle and the SOC value of the power battery, so as to control the fuel cell system to output power through a preset fuzzy rule; The battery charging module is used to control the fuel cell system to charge the power battery according to the energy management mode and the SOC value.

9. An electronic device, characterized in that: include: at least one processor; and a memory communicatively coupled to at least one of the processors; Wherein, the memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors so that at least one of the processors can execute an energy management method for a fuel cell vehicle as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the energy management method for a fuel cell vehicle according to any one of claims 1 to 7.

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