Start-stop control method and device of fuel cell engine, vehicle and storage medium

Abstract

The application relates to a start-stop control method and device of a fuel cell engine, a vehicle and a storage medium, wherein the method comprises the following steps: when the vehicle does not need to be powered by a fuel cell, acquiring a current working condition type of the vehicle and a current SOC value of a power battery; matching a minimum running duration of the fuel cell according to the current working condition and the current SOC value; after the fuel cell is started and runs, when the vehicle no longer needs to be powered by the fuel cell and the continuous running duration of the fuel cell reaches the minimum running duration, stopping the fuel cell power supply, otherwise, continuously controlling the fuel cell to supply power until the continuous running duration reaches the minimum running duration. According to the application, the minimum running duration can be determined based on the current fuel cell attenuation rate, the working condition type and the battery SOC, so that the number of start-stop times of the fuel cell under different running conditions is reduced, the service life of the fuel cell system is prolonged, the fuel cell system can better adapt to the running state of the system, the adaptability of the fuel cell to the current driving working condition is improved, and the control effect under the changing working condition is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fuel cell, and particularly relates to a start-stop control method and device of a fuel cell engine, a vehicle and a storage medium. BACKGROUND

[0002] Fuel cell vehicles have a wide range of research in the vehicle field due to their advantages of no pollution, zero emission and renewable resource consumption. When the power battery is in a maintenance state, the fuel cell will experience multiple starts and stops if the vehicle is running at this time, and each start or shutdown of the fuel cell will increase the life attenuation of the fuel cell, greatly testing the durability of the fuel cell.

[0003] In view of the problem that start-stop will increase the attenuation of the fuel cell, when the physical structure of the system is determined, the system strategy is usually improved from the following two aspects to reduce the attenuation of the fuel cell caused by start-stop:

[0004] 1. Controlling the attenuation of the start-stop process, such as controlling the humidity of the reaction gas, the closing sequence of the reaction gas, using auxiliary load, etc.

[0005] 2. Reducing the number of starts and stops, such as adding a penalty factor or a running time constraint, which will limit the fuel cell when it is about to start or shut down, in order to achieve the purpose of reducing the number of starts and stops.

[0006] At present, the related technology (CN110758180A) can collect the power data of the power battery and the load current of the vehicle, determine the start and shutdown operation of the fuel cell according to the current opening and closing state of the fuel cell and the power data of the power battery, and then perform energy distribution on the fuel cell module and the super capacitor module according to the power of the power battery, the power of the super capacitor and the current demand of the load collected by the data acquisition module. In addition, the related technology (CN109334476A) can also increase the fuel cell controller on the basis of the existing fuel cell vehicle control system, control the start-stop state of the fuel cell engine by the fuel cell controller through the vehicle controller, select the target power from the minimum, maximum power and available maximum power in the high efficiency area when the fuel cell engine starts through the remaining power of the power battery and the vehicle speed; limit the target power according to the vehicle working condition, so as to control the power output of the fuel cell engine.

[0007] However, when the related technology controls the start-stop of the fuel cell according to the running time, it does not consider the specific influence of different battery SOC (State Of Charge) on the time constraint in the actual driving process of the vehicle, as well as the influence of the attenuation rate and the working condition type on the start-stop of the fuel cell, which is too one-sided in considering factors, greatly affecting the service life of the fuel cell system and the start-stop control effect, and needs to be solved urgently. SUMMARY

[0008] The application provides a start-stop control method, device, vehicle and storage medium of a fuel cell engine, to solve the problem that the related art does not consider the influence of the decay rate, the working condition type and the SOC of the battery on the time constraint in the actual driving process of the vehicle when controlling the start-stop of the fuel cell according to the running time, which greatly affects the control effect of the start-stop of the fuel cell.

[0009] The first aspect of the application provides a start-stop control method of a fuel cell engine, comprising the following steps: obtaining the current working condition type of the vehicle and the current SOC value of the power battery when the vehicle does not need to be powered by the fuel cell; matching the minimum running time of the fuel cell according to the current working condition type and the current SOC value; and after the fuel cell is started and runs, when the vehicle no longer needs to be powered by the fuel cell and the continuous running time of the fuel cell reaches the minimum running time, stopping the fuel cell power supply, otherwise controlling the fuel cell to continue to supply power until the continuous running time reaches the minimum running time.

[0010] According to the above technical means, the embodiments of the application can determine the minimum running time based on the current decay rate of the fuel cell, the working condition type and the SOC of the battery, thereby reducing the number of start-stops of the fuel cell under different running conditions, improving the service life of the fuel cell system, making it better adapt to the running state of the system, and improving the adaptability of the fuel cell to the current driving condition and the control effect under the changing condition.

[0011] Optionally, in an embodiment of the application, after matching the minimum running time of the fuel cell, it further comprises: obtaining the total running time of the fuel cell, and calculating an actual decay correction coefficient according to the total running time; obtaining the historical working condition and the corresponding working condition type of the vehicle, and generating update information of the working condition; and adjusting the minimum running time according to the actual decay correction coefficient and / or the update information.

[0012] According to the above technical means, the embodiments of the application correct the decay rate of the fuel cell as it runs, and record the driving condition of the vehicle as the historical driving condition. Every time interval, the minimum running time of the fuel cell under different SOCs is calculated based on the current decay rate and the historical working condition data of the vehicle, so that it better adapts to the running state of the system and effectively improves the adaptability of the fuel cell to the current driving condition.

[0013] Optionally, in an embodiment of the present application, before the current working condition type of the vehicle and the current SOC value of the power battery are acquired, the method further comprises: distributing power between the fuel cell and the power battery or distributing power among the fuel cell, the power battery and the super capacitor according to the whole vehicle demand power of the vehicle, to obtain a distribution result; and determining whether the vehicle needs power supply of the fuel cell according to the distribution result.

[0014] According to the above technical means, the embodiment of the present application distributes power between the fuel cell and the power battery or among the fuel cell, the power battery and the super capacitor according to the whole vehicle demand power of the vehicle, so that the determination of whether the fuel cell needs to supply power is more accurate, and the reliability of the vehicle is improved.

[0015] Optionally, in an embodiment of the present application, when the vehicle needs power supply of the fuel cell, a start request is sent to the fuel cell, so that the fuel cell outputs power according to the distribution result.

[0016] According to the above technical means, the embodiment of the present application receives a start request of the fuel cell to control the fuel cell to supply power according to the distribution result, so that the power supply efficiency of the fuel cell is effectively improved.

[0017] Optionally, in an embodiment of the present application, the acquisition of the current working condition type of the vehicle comprises: collecting working condition characteristic parameters of the vehicle within a preset time length; and inputting the working condition characteristic parameters into a pre-constructed probabilistic neural network model to output the current working condition type.

[0018] According to the above technical means, the embodiment of the present application can collect vehicle driving working condition characteristic parameters in real time, and output the current working condition type in combination with the probabilistic neural network model, so as to effectively guarantee the reliability of the acquired current working condition type data of the vehicle, and provide high-quality data support for subsequent start-stop control of the fuel cell engine.

[0019] The second aspect embodiment of the present application provides a start-stop control device of a fuel cell engine, comprising: an acquisition module configured to acquire a current working condition type of a vehicle and a current SOC value of a power battery when the vehicle does not need power supply of a fuel cell; a matching module configured to match a minimum running time of the fuel cell according to the current working condition type and the current SOC value; and a control module configured to, after the fuel cell is started and runs, stop the power supply of the fuel cell when the vehicle no longer needs the power supply of the fuel cell and a continuous running time of the fuel cell reaches the minimum running time, or control the fuel cell to continuously supply power until the continuous running time reaches the minimum running time.

[0020] Optionally, in an embodiment of the present application, the method further comprises: a calculating module configured to calculate a total running time of the fuel cell after the minimum running time of the fuel cell is matched, and calculate an actual attenuation correction coefficient according to the total running time; a generating module configured to obtain historical driving conditions of the vehicle and corresponding driving condition types, and generate updated information of the driving conditions; and an adjusting module configured to adjust the minimum running time according to the actual attenuation correction coefficient and / or the updated information.

[0021] Optionally, in an embodiment of the present application, the method further comprises: a distributing module configured to distribute power between the fuel cell and the power battery or between the fuel cell, the power battery and the super capacitor according to a total power demand of the vehicle to obtain a distribution result before obtaining the current driving condition type of the vehicle and the current SOC value of the power battery; and a judging module configured to determine whether the vehicle needs to be powered by the fuel cell according to the distribution result.

[0022]

[0023] Optionally, in an embodiment of the present application, the obtaining module comprises: a collecting unit configured to collect driving condition characteristic parameters of the vehicle within a preset time period; and an input unit configured to input the driving condition characteristic parameters into a pre-constructed probabilistic neural network model to output the current driving condition type.

[0024] An embodiment of the third aspect of the present application provides a vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the start-stop control method of the fuel cell engine as described in the above embodiments.

[0025] An embodiment of the fourth aspect of the present application provides a computer readable storage medium, which stores a computer program executable by a processor to implement the start-stop control method of the fuel cell engine as described above.

[0026] Therefore, the embodiments of the present application have the following beneficial effects:

[0027] (1) The embodiments of the present application can determine the minimum running time based on the current fuel cell attenuation rate, the driving condition and the SOC of the battery, thereby reducing the start-stop times of the fuel cell under different running conditions, improving the service life of the fuel cell system, making it better adapt to the running state of the system, and improving the adaptability of the fuel cell to the current driving condition and the control effect under the changing driving condition.

[0028] ​(2) The embodiment of the present application corrects the decay rate of the fuel cell as the fuel cell operates, records the driving conditions of the vehicle as historical driving conditions, and calculates the minimum operation time of the fuel cell under different SOC based on the current decay rate and the historical driving condition data of the vehicle every certain period of time, so as to better adapt to the operation state of the system and effectively improve the adaptability of the fuel cell to the current driving conditions.

[0029] (3) The embodiment of the present application distributes the power between the fuel cell and the power battery, or between the fuel cell, the power battery and the super capacitor according to the total power demand of the vehicle, so as to make the judgment of whether the fuel cell needs to supply power more accurate and improve the reliability of the vehicle.

[0030] (4) The embodiment of the present application receives the start request of the fuel cell to control the fuel cell to supply power according to the distribution result, so as to effectively improve the power supply efficiency of the fuel cell.

[0031] (5) The embodiment of the present application can acquire the characteristic parameters of the vehicle in the driving conditions in real time, and output the current driving condition type in combination with the probabilistic neural network model, so as to effectively guarantee the reliability of the acquired current driving condition data of the vehicle and provide high-quality data support for the subsequent start-stop control of the fuel cell engine.

[0032] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0034] Figure 1 A flowchart of a start-stop control method of a fuel cell engine according to an embodiment of the present application is shown in the figure;

[0035] Figure 2 An execution logic diagram of a start-stop control method of a fuel cell engine according to an embodiment of the present application is shown in the figure;

[0036] Figure 3 A flowchart of calculating the minimum operation time of the fuel cell under different driving conditions and different SOC according to an embodiment of the present application is shown in the figure;

[0037] Figure 4 An example diagram of a start-stop control device of a fuel cell engine according to an embodiment of the present application is shown in the figure;

[0038] Figure 5 A structural diagram of a vehicle according to an embodiment of the present application is shown in the figure.

[0039] Wherein, 10 - fuel cell engine start-stop control device, 100 - acquisition module, 200 - matching module, 300 - control module, 501 - memory, 502 - processor, 503 - communication interface. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below with reference to the accompanying drawings, wherein the same or similar notations used throughout the drawings and specification denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0041] The fuel cell engine start-stop control method, device, vehicle and storage medium of the embodiments of the present application are described below with reference to the accompanying drawings. In view of the problems mentioned in the above background art, the present application provides a fuel cell engine start-stop control method, in which the current working condition type of the vehicle and the current SOC value of the power battery are obtained when the vehicle does not need to be powered by the fuel cell; the minimum running time of the fuel cell is matched according to the current working condition and the current SOC value; after the fuel cell is started and runs, when the vehicle no longer needs to be powered by the fuel cell and the continuous running time of the fuel cell reaches the minimum running time, the fuel cell power supply is stopped, otherwise the fuel cell continues to supply power until the continuous running time reaches the minimum running time. The present application can determine the minimum running time based on the current fuel cell decay rate, the working condition type and the battery SOC, thereby reducing the number of fuel cell start-stop under different operating conditions, improving the service life of the fuel cell system, making it better adapt to the operating state of the system, improving the adaptability of the fuel cell to the current driving condition and the control effect under changing conditions. Thus, the problem that the related art does not consider the influence of the decay rate of the vehicle in the actual driving process, the working condition type and the battery SOC on the time constraint when controlling the fuel cell start-stop according to the running time, which greatly affects the fuel cell start-stop control effect, is solved.

[0042] Specifically, Figure 1 A flowchart of a fuel cell engine start-stop control method provided by an embodiment of the present application is shown in FIG. 1.

[0043] As Figure 1 shown, the fuel cell engine start-stop control method includes the following steps:

[0044] In step S101, when the vehicle does not need to be powered by the fuel cell, the current working condition type of the vehicle and the current SOC value of the power battery are obtained.

[0045] In the embodiments of the present application, if the vehicle does not need the fuel cell to provide power for power supply, the current working condition type of the vehicle (including low-speed working condition, medium-speed working condition and high-speed working condition) and the minimum running time of the fuel cell under the current SOC are determined, thereby providing guidance and basis for subsequent fuel cell power supply.

[0046] Optionally, in an embodiment of the present application, the current working condition of the vehicle is obtained by: collecting working condition characteristic parameters of the vehicle within a preset time length; inputting the working condition characteristic parameters into a pre-constructed probabilistic neural network model to output the current working condition type.

[0047] The embodiments of the present application can collect working condition characteristic parameters of the vehicle within a certain time length (such as 2 minutes), for example, maximum speed, minimum speed, average speed, maximum acceleration, etc., and input the characteristic parameters into a trained probabilistic neural network model to identify the current working condition type.

[0048] For example, the embodiments of the present application can first collect working condition characteristic parameters of the vehicle in the first two minutes, such as average speed, maximum acceleration, etc., and input the probabilistic neural network model to identify the current working condition type. For example, if the model outputs 1, it represents that the current working condition is a low-speed working condition; if the model outputs 2, it represents that the current working condition is a medium-speed working condition; and if the model outputs 3, it represents that the current working condition is a high-speed working condition. Within the first two minutes of starting driving, the driving working condition type can be automatically identified as a low-speed working condition.

[0049] Therefore, the embodiments of the present application can effectively guarantee the reliability of the obtained current working condition data of the vehicle by collecting the working condition characteristic parameters of the vehicle in real time and combining the probabilistic neural network model to output the current working condition type, thereby providing high-quality data support for subsequent start-stop control of the fuel cell engine.

[0050] Optionally, in an embodiment of the present application, before obtaining the current working condition type of the vehicle and the current SOC value of the power battery, it further includes: distributing power between the fuel cell and the power battery or between the fuel cell, the power battery and the super capacitor according to the whole vehicle demand power to obtain a distribution result; and determining whether the vehicle needs fuel cell power supply according to the distribution result.

[0051] It should be noted that, before obtaining the current working condition type of the vehicle and the current SOC value of the power battery, the embodiments of the present application need to distribute power between the fuel cell and the power battery or between the fuel cell, the power battery and the super capacitor according to the whole vehicle demand power, and determine whether the whole vehicle needs fuel cell power supply according to the distribution result.

[0052] Therefore, the embodiment of the present application allocates power between the fuel cell and the power battery, or among the fuel cell, the power battery and the super capacitor according to the whole vehicle demand power of the vehicle, so that the judgment of whether the fuel cell needs to supply power is more accurate, and the reliability of the vehicle is improved.

[0053] Optionally, in an embodiment of the present application, further comprising: when the vehicle needs the fuel cell to supply power, sending a start request to the fuel cell, so that the fuel cell outputs power according to the allocation result.

[0054] When the vehicle needs the fuel cell to supply power, the embodiment of the present application can send a start request of the fuel cell to the whole vehicle controller, and after the fuel cell receives the start request, it is judged whether the start is completed based on the working mode of the fuel cell. If the fuel cell is changed from the cold start or normal temperature start mode to the running mode, it is determined that the start is completed.

[0055] When the fuel cell is changed to the running state, the running time of the fuel cell and the driving condition data of the vehicle after this start are recorded until the fuel cell is shut down, and the above recording is cleared.

[0056] Therefore, the embodiment of the present application receives the start request of the fuel cell to control the fuel cell to provide power according to the allocation result, so as to effectively improve the power supply efficiency of the fuel cell.

[0057] In step S102, the minimum running time of the fuel cell is matched according to the current condition type and the current SOC value.

[0058] After obtaining the current condition type of the vehicle and the current SOC value of the power battery, further, the embodiment of the present application can obtain the current battery SOC value from the battery management system, and according to the two-dimensional relationship table corresponding to the current condition type and the battery SOC and the minimum running time of the fuel cell, the minimum running time of the fuel cell under the current condition is obtained by interpolation. In the driving process of the vehicle, if the condition type or the battery SOC of the vehicle changes, the minimum running time of the fuel cell under this condition will also change in real time.

[0059] Therefore, the embodiment of the present application determines the minimum running time of the fuel cell according to the condition type and the battery SOC based on the current decay rate of the fuel cell, so that the minimum running time threshold can be adaptively changed according to the SOC state and the condition type, and the control effect under the changing condition is effectively improved.

[0060] Optionally, in an embodiment of the present application, after matching the minimum running time of the fuel cell, further comprising: obtaining the total running time of the fuel cell, and calculating the actual attenuation correction coefficient according to the total running time; obtaining the historical working conditions of the vehicle and the corresponding working condition types, and generating the update information of the working conditions; adjusting the minimum running time according to the actual attenuation correction coefficient and / or the update information.

[0061] It should be noted that, after matching the minimum running time of the fuel cell, the embodiment of the present application can add the total running time of the fuel cell after the last running to the running time of the fuel cell this time every time the fuel cell receives a shutdown request, so as to obtain and record the total running time of the fuel cell; in addition, based on the attenuation model of the fuel cell, it is known that under the same working conditions, the attenuation rate of the fuel cell in the initial stage of running is faster, and the attenuation rate in the later stage is slower, therefore, the embodiment of the present application needs to obtain the attenuation correction coefficient of the current fuel cell according to the total running time, correct the basic theoretical attenuation model, and determine the attenuation rate of the current fuel cell.

[0062] In addition, the embodiment of the present application also needs to record the historical working conditions of the vehicle and the corresponding working condition types as the working conditions for updating the minimum running time, and splice and combine the same working condition types and the corresponding working conditions to obtain more complete low-speed, medium-speed and high-speed working condition databases.

[0063] Further, the embodiment of the present application can update the minimum running time of the fuel cell under different working conditions and different battery SOC according to the current attenuation coefficient and the historical working conditions, and the specific steps are as follows:

[0064] Step 1, determine the attenuation correction coefficient of the current fuel cell and the three working condition data every certain period of time;

[0065] Step 2, select the working condition for which the minimum running time needs to be calculated, and intercept a working condition with a shorter time, if the intercepted time is too long, the battery SOC may change greatly;

[0066] Step 3, divide the battery SOC in the change range into n cases, SOC(i), i = 1, 2, 3…n, and divide the minimum running time of the fuel cell into m cases, t(j), j = 1, 2, 3…m;

[0067] Step 4, take the hydrogen consumption, the electric energy consumption of the fuel and the attenuation cost of the battery as the running cost, that is, J(j) = J_H2+J_elc+J_loss, wherein J(j) represents the running cost when the minimum running time is t(j), J_H2 represents the hydrogen consumption, J_elc represents the electric energy consumption, and J_loss represents the attenuation cost of the fuel cell;

[0068] Step 5, set the battery SOC as SOC(i), traverse the running time of the fuel cell under the initial condition until t(j)=t(m), select the minimum running cost in m running costs, and take the minimum running time of the fuel cell under the SOC(i) condition as the minimum running time of the fuel cell under the SOC(i) condition, denoted as

[0069] Step 6, keep the working condition type unchanged, gradually change the initial SOC value of the battery, traverse the minimum running time of the fuel cell under different SOCs until SOC(i)=SOC(n), and obtain the minimum running time of the fuel cell under different initial SOCs under the working condition

[0070] Step 7, change the working condition, repeat the above steps, and calculate the minimum running time of the fuel cell corresponding to different battery SOCs under other working conditions.

[0071] It can be understood that the embodiments of the present application will correct the decay rate of the fuel cell as the fuel cell runs, and record the driving working condition of the vehicle as the historical driving working condition. Every time interval, the minimum running time of the fuel cell under different SOCs is calculated based on the current decay rate and the historical working condition data of the vehicle, so that it better adapts to the running state of the system, and effectively improves the adaptability of the fuel cell to the current driving working condition.

[0072] In step S103, after the fuel cell is started to run, when the vehicle no longer needs the fuel cell to supply power, and the continuous running time of the fuel cell reaches the minimum running time, the fuel cell stops supplying power, otherwise the fuel cell continues to supply power until the continuous running time reaches the minimum running time.

[0073] In the embodiments of the present application, if the running time of the fuel cell is not greater than the minimum running time of the fuel cell under the current condition, the fuel cell keeps the output power of the last moment to continue to work, and the embodiments of the present application will redistribute the power between the energy sources until the running time is greater than the minimum running time.

[0074] If the system does not need the fuel cell to supply power, and the running time of the fuel cell is greater than the minimum running time of the fuel cell under the current condition, the fuel cell sends a request to shut down, and clears the record of the running time and the vehicle driving working condition.

[0075] Therefore, when the fuel cell does not need to provide power, the system will determine whether the fuel cell can be turned off under the current condition according to the running time, so as to effectively reduce the start-stop times of the fuel cell under different running conditions, and improve the service life of the fuel cell.

[0076] The start-stop control method for a fuel cell engine proposed in this application will be described in detail below through a specific embodiment and in conjunction with the accompanying drawings.

[0077] Figure 2 This is a schematic diagram illustrating the execution logic of the start-stop control method for the fuel cell engine proposed in this application. Figure 2 As shown, the specific process of implementing start-stop control of the fuel cell engine in the embodiments of this application is as follows:

[0078] 1. When the vehicle controller requires power P from the fuel cell fc When the value is greater than 0, a start-up request will be sent to the fuel cell. Once the fuel cell has started up and is operating, outputting power to the vehicle, the system will begin recording the fuel cell's operating time and the vehicle's driving condition data.

[0079] 2. Depending on the vehicle's energy system configuration, such as a fuel cell combined with a battery, or a fuel cell, battery, and capacitor, the vehicle control strategy will allocate power between the energy sources. During the operation of the fuel cell, when the vehicle control strategy requires power P from the fuel cell... fc When t = 0, the minimum operating time of the current fuel cell needs to be determined first, and then the operating time t of the fuel cell in this operation needs to be determined. now Is it greater than the minimum running time t? min ;

[0080] 3. Determine the minimum operating time t of the current fuel cell based on the operating condition type and SOC. min First, the vehicle's operating condition characteristics for the first two minutes are analyzed, such as maximum speed, minimum speed, average speed, and maximum acceleration. These parameters are then input into a pre-trained probabilistic neural network model to identify the current operating condition type. If the model outputs 1, the current operating condition is low-speed; if it outputs 2, it's medium-speed; and if it outputs 3, it's high-speed. For the first two minutes of vehicle operation, the operating condition is identified as low-speed. Then, the current battery SOC value is obtained from the battery management system. Based on the operating condition type and the two-dimensional relationship table between SOC and minimum operating time, the minimum operating time t of the current fuel cell is interpolated. min As the vehicle travels, the operating conditions or battery SOC change, and the minimum operating time of the fuel cell under the current conditions also changes in real time.

[0081] 4. If the fuel cell operation time t is... now <t min Then the fuel cell maintains the output power P from the previous moment. fc_last Continue working, i.e., P fc =P fc_last, the vehicle control strategy will redistribute power among the energy sources until t now t min , the fuel cell can be shut down;

[0082] 5. When the vehicle control strategy requires the fuel to provide power P fc = 0, if the fuel cell operating time t now t min , the fuel cell requests to shut down and clears the recorded data this time;

[0083] 6. After receiving the shutdown request each time, the fuel cell records the total operating time t total and determines the decay rate at the current total operating time. The total operating time t total_last after the last operation of the fuel cell is added to the operating time of the fuel cell this time to obtain the total operating time at this time, i.e. t total = t total_lasr + t now . Based on the decay model of the fuel cell, under the same working conditions, the decay rate is faster at the beginning of the operation of the fuel cell and slower at the later stage, so it is necessary to obtain the decay correction coefficient according to the total operating time to correct the basic theoretical decay model and determine the decay rate of the current fuel cell. The decay correction coefficient of the fuel cell under different total operating times is obtained through experimental data. The basic theoretical decay model of the fuel cell is Δd fc = k p (k1t1+k2t2+k3n1+k4n2), wherein Δd fc represents the decay rate; t1 represents the idling time; t2 represents the peak power operating time; n1 represents the number of variable loads; n2 represents the number of start-stop times; k p represents the correction factor of different fuel cell systems; k1 represents the decay rate under idling conditions; k2 represents the decay rate when providing peak power; k3 represents the decay rate when the load is variable; k4 represents the decay rate when starting and stopping. After correction, the decay rate of the current fuel cell is

[0084] 7. After receiving the shutdown request each time, the fuel cell will record the vehicle historical working conditions and the corresponding working condition types, splice and combine the same working condition types and the corresponding working conditions to obtain a more complete low-speed, medium-speed and high-speed working condition database for the vehicle to travel. Assuming that the low-speed working condition speed sequence data after the last vehicle travel is v low1 , v low2 , v low3 …v lown1 , the medium-speed working condition speed sequence data is v middle1 , v middle2 , vmiddle3 …v middlen2 , the speed sequence data of the high-speed working condition is v high1 ,v high2 ,v high3 …v highn3 If the vehicle travels for 10 minutes this time, 600 data are recorded once per second, the low-speed working condition is 2 minutes, and the speed sequence data is v low1 ,v low2 ,v low3 …v low120 , the medium-speed working condition is 5 minutes, and the speed sequence data is v middle1 ,v middle2 ,v middle3 …v middl2300 , the high-speed working condition is 3 minutes, and the speed sequence data is v high1 ,v high2 ,v high3 …v high180 . After splicing with the historical working condition after the vehicle travels last time, the speed sequence data of the low-speed working condition is v low1 ,v low2 ,v low3 …v lown1 ,v lown1+1 ,v lown1+2 …v lown1+120 , the speed sequence data of the medium-speed working condition is v middle1 ,v middle2 ,v middle3 …v middlen2 ,v middlen2+1 ,v middlen2+2 …v middlen2+300 , and the speed sequence data of the high-speed working condition is v high1 ,v high2 ,v high3 …v highn3 ,v highn3+1 ,v highn3+2 …v highn3+180 .

[0085] After the above steps, the decay rate Δd fc of the current fuel cell system and the three working condition data are obtained, and the minimum running time is updated every certain period of time, for example, once every 3 days, and the flow of updating calculation is as shown in Figure 3 :

[0086] 1. Select the working condition for which the minimum running time needs to be calculated, first select the low-speed working condition, and cut off a shorter working condition in a recent period of time, for example, 1000s, if the cut-off time is too long, the situation of large change of battery SOC may occur;

[0087] 2. Divide the initial SOC of the battery into n cases within the range of variation, SOC(i), i = 1, 2, 3...n. For a fuel cell combined with a battery without external charging, or a vehicle with a fuel cell, battery and supercapacitor combination, the battery charge is in a maintenance state during the operation of the vehicle. For example, the SOC is maintained at around 0.6. At this time, the range of SOC variation can be 0.5 to 0.7. Divide this range into n cases, such as n = 20. Therefore, SOC(1) = 0.5, SOC(n) = 0.7. For a fuel cell combined with a battery with external charging, or a vehicle with a fuel cell, battery and supercapacitor combination, the battery charge is in two states during the operation of the vehicle: consumption and maintenance. When the battery charge is in the consumption state, the charge is sufficient, and the vehicle is mainly powered by the battery. The fuel cell basically does not participate in the work. When the battery charge is in the maintenance state, the fuel cell will work for a long time and there will be multiple start-stops. Therefore, start-stop is only controlled during the charge maintenance stage. For example, if SOC is maintained around 0.3, the range of SOC variation can be 0.2 to 0.4. Within this range, there are n equal cases, such as n = 20; therefore, SOC(1) = 0.2 and SOC(n) = 0.4.

[0088] 3. Divide the minimum operating time of the fuel cell into m cases within the set upper limit range, t(j), j=1,2,3…m. For example, if the upper limit of the minimum operating time of the fuel cell is 500s, then there are 500 cases, m=500, so t(1)=1s, t(m)=500s;

[0089] 4. Using the current fuel cell degradation cost, hydrogen consumption, and electricity consumption as the operating cost, i.e., J(j) = J H2 +J elc +J loss Where J(j) represents the operating cost when the minimum running time is t(j), J H2 This indicates hydrogen consumption, calculated as follows: m H2 Price represents the amount of hydrogen consumed at any given moment. H2 Indicates the price of hydrogen; J ele This represents the energy consumption, calculated using the following formula: P b Price represents the power supplied by the battery at any given moment. ele Indicates the electricity price; J loss This represents the degradation cost of a fuel cell, calculated as follows: Price fc P represents the price per kW of fuel cell. fc_norm This indicates the rated power of the fuel cell, and 10% indicates the maximum degradation level of the fuel cell. Once the degradation exceeds 10%, the fuel cell will be scrapped.

[0090] 5, set the battery SOC as SOC(i), for the energy source system that can be externally charged, starting from SOC(1) = 0.2, traverse the running time of the fuel cell from t(1) = 1s to t(500) = 500s under the initial condition, select the minimum running cost, and the minimum running time of the fuel cell corresponding to the minimum running cost as the minimum running time of the fuel cell under the SOC(i) condition, denoted as Suppose the running time when the running cost is the lowest after traversal at SOC(1) = 0.2 is 100s, then the minimum running time of the fuel cell at SOC = 0.2 under the low-speed working condition is

[0091] 6, keep the working condition type unchanged, gradually change the initial SOC value of the battery, traverse the minimum running time of the fuel cell under different SOCs, until SOC = 0.4, obtain the minimum running time of the fuel cell under different initial SOCs under the working condition:

[0092] 7, change the working condition type, repeat the above steps, and calculate the minimum running time of the fuel cell corresponding to different battery SOCs under the medium-speed and high-speed working conditions.

[0093] According to the start-stop control method of the fuel cell engine provided in the embodiments of the present application, when the vehicle does not need to be powered by the fuel cell, the current working condition type of the vehicle and the current SOC value of the power battery are obtained; the minimum running time of the fuel cell is matched according to the current working condition and the current SOC value; after the fuel cell is started and runs, and the vehicle no longer needs to be powered by the fuel cell, and the continuous running time of the fuel cell reaches the minimum running time, the fuel cell power supply is stopped, otherwise the fuel cell is controlled to continue to supply power until the continuous running time reaches the minimum running time. Based on the current fuel cell decay rate, the minimum running time can be determined through the working condition type and the battery SOC, so as to reduce the start-stop times of the fuel cell under different running conditions, improve the service life of the fuel cell system, make it better adapt to the running state of the system, and improve the adaptability of the fuel cell to the current driving condition and the control effect under the changing condition.

[0094] Secondly, the start-stop control device of the fuel cell engine according to the embodiments of the present application is described with reference to the accompanying drawings.

[0095] Figure 4 is a block schematic diagram of the start-stop control device of the fuel cell engine according to the embodiments of the present application.

[0096] As shown in Figure 4 , the start-stop control device 10 of the fuel cell engine includes an obtaining module 100, a matching module 200 and a control module 300.

[0097] The acquisition module 100 is configured to acquire a current working condition type of the vehicle and a current SOC value of the power battery when the vehicle does not need to be powered by the fuel cell.

[0098] The matching module 200 is configured to match the minimum running duration of the fuel cell according to the current working condition type and the current SOC value.

[0099] The control module 300 is configured to, after the fuel cell is started to run, stop the fuel cell from powering the vehicle when the vehicle no longer needs to be powered by the fuel cell and the continuous running duration of the fuel cell reaches the minimum running duration, or control the fuel cell to continuously power the vehicle until the continuous running duration reaches the minimum running duration.

[0100] Optionally, in an embodiment of the present application, the start-stop control device 10 of the fuel cell engine further comprises a calculation module, a generation module and an adjustment module.

[0101] The calculation module is configured to acquire a total running duration of the fuel cell after the minimum running duration of the fuel cell is matched, and calculate an actual attenuation correction coefficient according to the total running duration.

[0102] The generation module is configured to acquire historical working conditions of the vehicle and corresponding working condition types, and generate update information of the working conditions.

[0103] The adjustment module is configured to adjust the minimum running duration according to the actual attenuation correction coefficient and / or the update information.

[0104] Optionally, in an embodiment of the present application, the start-stop control device 10 of the fuel cell engine further comprises a distribution module and a judgment module.

[0105] The distribution module is configured to distribute power between the fuel cell and the power battery or between the fuel cell, the power battery and the super capacitor according to a total power demand of the vehicle before the current working condition type of the vehicle and the current SOC value of the power battery are acquired, to obtain a distribution result.

[0106] The judgment module is configured to judge whether the vehicle needs to be powered by the fuel cell according to the distribution result.

[0107] Optionally, in an embodiment of the present application, the start-stop control device 10 of the fuel cell engine further comprises a sending module configured to send a start request to the fuel cell when the vehicle needs to be powered by the fuel cell, so that the fuel cell outputs power according to the distribution result.

[0108] Optionally, in an embodiment of the present application, the acquisition module 100 comprises an acquisition unit and an input unit.

[0109] The collection unit is configured to collect a working condition characteristic parameter of the vehicle within a preset time length.

[0110] The input unit is configured to input the working condition characteristic parameter into a pre-constructed probabilistic neural network model, and output a current working condition type.

[0111] It should be noted that the foregoing description of the fuel cell engine start-stop control method embodiment is also applicable to the fuel cell engine start-stop control device of the embodiment, which will not be described here again.

[0112] According to the fuel cell engine start-stop control device provided in the embodiment of the present application, when the vehicle does not need to be powered by the fuel cell, the current working condition type of the vehicle and the current SOC value of the power battery are obtained; the minimum running time of the fuel cell is matched according to the current working condition and the current SOC value; after the fuel cell is started and runs, when the vehicle no longer needs to be powered by the fuel cell and the continuous running time of the fuel cell reaches the minimum running time, the fuel cell power supply is stopped, otherwise the fuel cell is controlled to continue to supply power until the continuous running time reaches the minimum running time. The present application can determine the minimum running time based on the current fuel cell decay rate, the working condition type and the battery SOC, thereby reducing the number of fuel cell start-stop under different running conditions, improving the service life of the fuel cell system, making it better adapt to the running state of the system, and improving the adaptability of the fuel cell to the current driving condition and the control effect under the changing condition.

[0113] Figure 5 A vehicle structure diagram is provided for the embodiment of the present application. The vehicle can include:

[0114] The memory 501, the processor 502 and the computer program stored in the memory 501 and executable on the processor 502.

[0115] The processor 502 implements the fuel cell engine start-stop control method provided in the above embodiments when executing the program.

[0116] Further, the vehicle further includes:

[0117] The communication interface 503 is configured to communicate between the memory 501 and the processor 502.

[0118] The memory 501 is configured to store the computer program executable on the processor 502.

[0119] The memory 501 can include a high-speed RAM memory, and can also include a non-volatile memory, such as at least one disk memory.

[0120] If the memory 501, the processor 502 and the communication interface 503 are implemented independently, the communication interface 503, the memory 501 and the processor 502 can be connected with each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 5 Only one thick line is used to represent the bus in the figure, but it does not mean that there is only one bus or only one type of bus.

[0121] Optionally, in a specific implementation, if the memory 501, the processor 502 and the communication interface 503 are integrated on a chip, the memory 501, the processor 502 and the communication interface 503 can complete communication between each other through an internal interface.

[0122] The processor 502 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0123] The embodiment also provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the start-stop control method of the fuel cell engine.

[0124] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0125] Moreover, the terms "first", "second", "third", etc. are used herein only to describe different steps or claims and do not imply a relative importance or a specific order of steps. Thus, a feature defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "N" is at least two, for example, two, three, etc., unless explicitly specified otherwise.

[0126] Any process or method descriptions or blocks in flow charts herein and elsewhere can be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process. Alternate implementations are included within the scope of the preferred embodiments of the present application in which additional functionality can be added or some functionality can be removed, by, for example, adding one or more steps performing a similar or new function, omitting one or more steps, or both. Such modifications and changes can be made to the processes and methods described with the understanding of this disclosure, and it is understood that the preferred embodiments of the present application can be practiced otherwise than as specifically described.

[0127] The logical and / or steps represented in flow charts herein and elsewhere can be considered as a sequence of executable instructions for implementing the functions or steps in the process, and the preferred embodiments of the present application include additional implementations in which the steps are executed in different orders, including substantially concurrently, or in reverse order, depending on the functionality involved, which will be apparent to those skilled in the art of the embodiments described herein.

[0128] It should be understood that portions of the application can be realized with a combination of hardware, software, firmware, or their combination. In the above-described embodiments, the N steps or methods can be realized with software or firmware stored in a memory and executed by a suitable instruction execution system. As in another embodiment, if realized with hardware, any one or their combination of the following technologies known in the art can be used: discrete logic circuit with logic gate circuit for implementing logic functions on data signals, application specific integrated circuit with suitable combination logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA), etc.

[0129] Those skilled in the art of the present technology can understand that all or part of the steps carried out by the above-mentioned embodiment method can be completed by a program instructing the relevant hardware, and the program can be stored in a computer readable storage medium. When the program is executed, it includes one of the steps of the method embodiment or a combination thereof.

[0130] In addition, each functional unit in each embodiment of the present application can be integrated into one processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be realized in the form of hardware or in the form of a software functional module. When the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0131] The above-mentioned storage medium can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-mentioned embodiments within the scope of the present application.

Claims

1. A start-stop control method of a fuel cell engine, characterized by, The method comprises the following steps: obtaining the current working condition type of the vehicle and the current SOC value of the power battery when the vehicle does not need to be powered by the fuel cell; matching the minimum running time of the fuel cell according to the current working condition type and the current SOC value; and stopping the fuel cell power supply when the vehicle no longer needs to be powered by the fuel cell and the continuous running time of the fuel cell reaches the minimum running time after the fuel cell is started, otherwise controlling the fuel cell to continue to supply power until the continuous running time reaches the minimum running time.

2. The method of claim 1, wherein, After matching the minimum running time of the fuel cell, it further comprises: obtaining the total running time of the fuel cell, and calculating the actual attenuation correction coefficient according to the total running time; obtaining the historical working condition and the corresponding working condition type of the vehicle to generate the update information of the working condition; adjusting the minimum running time according to the actual attenuation correction coefficient and / or the update information.

3. The method of claim 1, wherein, Before obtaining the current working condition type of the vehicle and the current SOC value of the power battery, it further comprises: allocating power between the fuel cell and the power battery or among the fuel cell, the power battery and the super capacitor according to the whole vehicle demand power of the vehicle to obtain the allocation result; judging whether the vehicle needs to be powered by the fuel cell according to the allocation result.

4. The method of claim 3, wherein, It further comprises: when the vehicle needs to be powered by the fuel cell, sending a start request to the fuel cell to make the fuel cell output power according to the allocation result.

5. The method of claim 1, wherein, The method of obtaining the current working condition of the vehicle comprises: collecting the working condition characteristic parameters of the vehicle within a preset time length; inputting the working condition characteristic parameters into a pre-constructed probabilistic neural network model to output the current working condition type.

6. A start-stop control device for a fuel cell engine, characterized in that, It comprises: an obtaining module for obtaining the current working condition type of the vehicle and the current SOC value of the power battery when the vehicle does not need to be powered by the fuel cell; a matching module for matching the minimum running time of the fuel cell according to the current working condition and the current SOC value; and a control module for stopping the fuel cell power supply when the vehicle no longer needs to be powered by the fuel cell and the continuous running time of the fuel cell reaches the minimum running time after the fuel cell is started, otherwise controlling the fuel cell to continue to supply power until the continuous running time reaches the minimum running time.

7. The apparatus of claim 6, wherein, It further comprises: a calculation module for obtaining the total running time of the fuel cell after matching the minimum running time of the fuel cell, and calculating the actual attenuation correction coefficient according to the total running time; a generation module for obtaining the historical working condition and the corresponding working condition type of the vehicle to generate the update information of the working condition; an adjustment module for adjusting the minimum running time according to the actual attenuation correction coefficient and / or the update information.

8. The apparatus of claim 6, wherein, It further comprises: The allocation module is configured to allocate power between the fuel cell and the power battery or among the fuel cell, the power battery and the super capacitor according to a total power demand of the vehicle before the current working condition type of the vehicle and the current SOC value of the power battery are acquired, and obtain an allocation result. The judgment module is configured to judge whether the vehicle needs to be powered by the fuel cell according to the allocation result.

9. The apparatus of claim 8, wherein, The method further comprises: The sending module is configured to send a start request to the fuel cell when the vehicle needs to be powered by the fuel cell, so that the fuel cell outputs power according to the allocation result.

10. The apparatus of claim 6, wherein, The obtaining module comprises: The acquisition unit is configured to acquire working condition characteristic parameters of the vehicle within a preset time length. The input unit is configured to input the working condition characteristic parameters into a pre-constructed probabilistic neural network model, and output the current working condition type.

11. A vehicle characterized by comprising: The method comprises: The memory, the processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the start-stop control method of the fuel cell engine according to any one of claims 1-5.

12. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the start-stop control method of the fuel cell engine according to any one of claims 1-5.

Images