Gas-electric engine aging calculation method and device, electronic equipment and storage medium

Abstract

The invention discloses a gas-electric engine aging calculation method and device, electronic equipment and a storage medium, and relates to the field of gas-electric engines, and the method comprises the following steps: collecting actual driving data of a fuel cell vehicle; cleaning the collected data; obtaining a physical model, and fitting parameters of the physical model; the physical model parameter fitting comprises the following steps: respectively substituting actual data of which the cleaned current is greater than the idling point current and initial reference data of a galvanic pile into a gas-electricity polarization physical model for parameter fitting; according to parameter fitting, a gas-electricity current and voltage performance fitting curve and an initial state gas-electricity current and voltage performance fitting curve are obtained; calculating the aging degree of the gas-electric engine according to the fitted curve; formulating a strategy for slowing down performance reduction of the fuel cell according to the aging degree of the gas-electric engine; the strategy for slowing down the performance reduction of the fuel cell comprises a strategy for controlling the operation of the fuel cell vehicle. Through the scheme, the aging degree is calculated in real time.

Description

Technical Field

[0001] The present application relates to the field of fuel cell engines, and in particular, to a method for calculating the aging of a fuel cell engine, a device for calculating the aging of a fuel cell engine, an electronic device, a storage medium, and a simulation platform. Background Art

[0002] Fuel cell vehicles have advantages such as being green and efficient, having a fast hydrogen refueling speed, and a long driving range compared to traditional fuel vehicles and other new energy vehicles. During the actual use of a fuel cell engine, its performance will decay due to aging, which will affect the service life of the fuel cell engine. Currently, the service life of fuel cell engines is relatively short, resulting in an increase in the overall operating cost of vehicles and affecting the commercialization of fuel cells. Therefore, it is necessary to calculate the actual aging degree based on the actual operating data of fuel cell vehicles, so as to provide a basis for formulating effective strategies to control the operation of fuel cell vehicles and slow down the performance decline.

[0003] However, the existing methods for calculating the aging of fuel cell engines are all developed based on fixed standard working conditions. During actual operation, fuel cell engines are often in harsh conditions beyond the design standards (such as high load and frequent working condition changes), resulting in the deviation of the aging calculation results from the actual situation by the traditional calculation method model, and poor applicability under actual working conditions.

[0004] Therefore, a fuel cell engine aging calculation scheme is needed to collect the actual operating stack current and stack voltage data of the fuel cell engine of a fuel cell vehicle, so that the aging calculation method can adapt to variable working conditions in real time. That is, by using the information of multi-dimensional dynamic factors such as driving behavior, vehicle state, and road conditions contained in the actual vehicle driving data, it is more dynamically adaptable to calculate the aging of the fuel cell engine using the information of multi-dimensional dynamic factors. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for calculating the aging of a fuel cell engine, a device for calculating the aging of a fuel cell engine, an electronic device, a storage medium, and a simulation platform, which can at least solve one of the technical problems of how to screen the current points participating in the calculation of the aging degree and how to fit a curve to calculate the aging degree of the fuel cell engine.

[0006] The present invention provides the following solutions:

[0007] According to one aspect of the present invention, there is provided a method for calculating the aging of a fuel cell engine, the method for calculating the aging of a fuel cell engine including:

[0008] Collecting the actual driving data of a fuel cell vehicle;

[0009] Cleaning the collected data;

[0010] Obtaining a physical model and fitting the physical model parameters;

[0011] The fitting of physical model parameters includes substituting the actual data with current greater than the idle point current after cleaning and the initial reference data of the fuel cell stack into the physical model of fuel cell polarization for parameter fitting;

[0012] According to the parameter fitting, the fuel cell current-voltage performance fitting curve and the fuel cell current-voltage performance fitting curve in the initial state are obtained;

[0013] Step 4, calculate the aging degree of the fuel cell engine according to the fitting curve;

[0014] According to the aging degree of the fuel cell engine, formulate a strategy to slow down the performance degradation of the fuel cell;

[0015] The strategy to slow down the performance degradation of the fuel cell includes the strategy to control the operation of the fuel cell vehicle.

[0016] Further, the collection of the actual driving data of the fuel cell vehicle includes: collecting the actual operating stack current and stack voltage data of the fuel cell engine of the fuel cell vehicle;

[0017] According to the collection of the actual driving data of the fuel cell vehicle, improve the dynamic adaptability of calculating the aging degree of the fuel cell engine.

[0018] Further, the cleaning of the collected data includes: based on the outliers generated by the interference of irresistible factors in the data acquisition and data transmission process, screening and removing the outliers;

[0019] Among them, obtain the fuel cell stack characteristic information when the battery vehicle is running;

[0020] Set the threshold intervals for the fuel cell voltage and the fuel cell current according to the fuel cell stack characteristics;

[0021] According to the data collection, draw the data scatter plot of the fuel cell voltage and the fuel cell current changing with time;

[0022] According to the data on the scatter plot exceeding the threshold intervals, remove the data exceeding the threshold intervals;

[0023] It also includes obtaining the box plot of the data distribution state and outliers;

[0024] Remove the data deviating from the upper and lower edges of the box plot;

[0025] It also includes setting the data sampling time interval threshold;

[0026] According to the data sampling time interval being greater than the sampling time interval threshold, perform data removal.

[0027] Further, the cleaning of the collected data includes:

[0028] Based on the data collected, a polarization scatter plot of the fuel cell voltage versus fuel cell current time is drawn;

[0029] Determine the actual idle current of the fuel cell vehicle based on the polarization scatter plot;

[0030] For the current data greater than the idle point current and the voltage data corresponding to the current data, the polarization curve parameters are fitted using physical equations;

[0031] The physics equations include:

[0032] Where a represents the thermodynamic electromotive force; b represents the activation polarization loss coefficient; c represents the inverse of the exchange current density; d represents the ohmic polarization loss coefficient; e represents the concentration polarization loss coefficient; f represents the limiting current density; I represents the current; and V represents the voltage.

[0033] Furthermore, calculating the aging degree of the fuel-electric engine according to the fitting curve includes:

[0034] Determine the calculation current point;

[0035] Calculate the aging degree at each calculation current point;

[0036] Determine the weighting coefficient at each current point;

[0037] Calculate the comprehensive aging degree.

[0038] Furthermore, determining the calculation current point includes:

[0039] Get the maximum reasonable current value Current max ;

[0040] According to the idle point current and the maximum reasonable current value Current max , set the current range;

[0041] The current will be greater than the idle point current and less than the maximum reasonable current value Current max The current interval is divided into n equal parts;

[0042] Will not include the idle point current and the maximum reasonable current value Current max The n-1 current values outside the current range are used as current points for calculating the aging degree.

[0043] Furthermore, the calculation of the aging degree at each calculation current point includes:

[0044] Substitute the determined current points involved in the aging degree calculation into the models of the fuel cell current-voltage performance fitting curve after parameter fitting and the initial-state fuel cell current-voltage performance fitting curve in Step 3 to obtain the current-state voltage and the initial-state voltage at the current points;

[0045] Based on the current-state voltage and the initial-state voltage at the current points, obtain the attenuation rate of the current voltage relative to the initial reference voltage at the current points;

[0046] Among them,

[0047] Denote the reference voltage value at the j-th current point as V Standard , and denote the current voltage value at the j-th current point as V Now , and denote the voltage attenuation degree at the j-th current point as Degree_of_Aging j , then the expression of Degree_of_Aging j is:

[0048]

[0049] Furthermore, the determination of the weighting coefficients at each current point includes:

[0050] Use the probability density of the current interval with each current point as the midpoint and a length of each n-equal division interval length as the weight of the attenuation degree of each current point;

[0051] Among them, denote the frequency of the current interval with the j-th current point as the midpoint and a length of each n-equal division interval length in the actual data as Count_p_Slope j , and denote the weight of the j-th current point as Weights j , then the expression of Weights j is:

[0052]

[0053] Furthermore, the calculation of the comprehensive aging degree includes:

[0054] Multiply the aging degrees at each calculated current point by the weighting coefficients at each current point respectively and then sum them up to obtain the comprehensive aging degree of the fuel cell engine;

[0055] Among them, denote the aging degree of the fuel cell engine as Degree_of_Aging, then the expression of Degree_of_Aging is as follows:

[0056]

[0057] Furthermore, the strategy for controlling the operation of the fuel cell vehicle includes:

[0058] Reduce the upper limit threshold of the fuel cell engine current according to the increase in the comprehensive aging degree of the fuel cell engine;

[0059] It also includes reducing the slope of the acceleration curve of the fuel cell vehicle operation according to the increase in the comprehensive aging degree of the fuel cell engine.

[0060] According to a second aspect of the present invention, there is provided an aging calculation device for a fuel cell engine, the aging calculation device for the fuel cell engine comprising:

[0061] A data collection module for collecting actual driving data of the fuel cell vehicle;

[0062] A data cleaning module for cleaning the collected data;

[0063] A parameter fitting module for obtaining a physical model and fitting the physical model parameters;

[0064] The physical model parameter fitting includes respectively substituting the actual data with the current greater than the idle point current after cleaning and the initial reference data of the fuel cell stack into the fuel cell polarization physical model for parameter fitting;

[0065] A fitting curve module for obtaining a fuel cell current-voltage performance fitting curve and an initial state fuel cell current-voltage performance fitting curve according to the parameter fitting;

[0066] An aging calculation module for calculating the aging degree of the fuel cell engine according to the fitting curve;

[0067] Formulate a strategy to slow down the decline of fuel cell performance according to the aging degree of the fuel cell engine;

[0068] The strategy to slow down the decline of fuel cell performance includes a strategy for controlling the operation of the fuel cell vehicle.

[0069] According to a third aspect of the present invention, there is provided an electronic device, comprising: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete mutual communication through the communication bus;

[0070] A computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the fuel cell engine aging calculation method.

[0071] According to a fourth aspect of the present invention, there is provided a computer-readable storage medium, which stores a computer program executable by an electronic device, and when the computer program runs on the electronic device, the electronic device executes the steps of the fuel cell engine aging calculation method.

[0072] According to a fifth aspect of the present invention, there is provided a simulation platform, comprising:

[0073] An electronic device for implementing the steps of the fuel cell engine aging calculation method described above;

[0074] A processor that runs a program, and when the program runs, executes the steps of the fuel cell engine aging calculation method on the data output from the electronic device;

[0075] A storage medium for storing a program that, when running, executes the steps of the fuel cell engine aging calculation method on the data output from the electronic device.

[0076] Through the above solution, the following beneficial technical effects are obtained:

[0077] By collecting information on multi-dimensional dynamic factors such as driving behavior, vehicle state, and road conditions contained in the actual operating stack current and stack voltage data of the fuel cell engine of a fuel cell vehicle, the calculation of fuel cell engine aging is made more dynamically adaptable.

[0078] By screening and eliminating outliers, the reliability of the data is ensured.

[0079] By combining a physical model and data statistical analysis, it has the ability to explain the causes of aging, high fidelity, and high calculation efficiency.

[0080] By participating in the calculation with actual vehicle operation data, this application is more in line with the actual operating conditions of the engine compared to traditional models.

[0081] The continuous operation algorithm of this application can calculate the aging degree of the fuel cell engine in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 is a flowchart of the fuel cell engine aging calculation method provided by one or more embodiments of the present invention.

[0083] Figure 2 is a structural diagram of the fuel cell engine aging calculation device provided by one or more embodiments of the present invention.

[0084] Figure 3 is a schematic diagram of the fuel cell engine aging calculation strategy of a specific embodiment of the present invention.

[0085] Figure 4 is a schematic diagram of the process for calculating the aging degree of the fuel cell engine in a specific embodiment of the present invention.

[0086] Figure 5 is a schematic diagram of the polarization scatter points in the vehicle original data of a specific embodiment of the present invention.

[0087] Figure 6It is a structural block diagram of an electronic device for a fuel cell engine aging calculation method provided by one or more embodiments of the present invention. Detailed implementation manners

[0088] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0089] Figure 1 It is a flowchart of a fuel cell engine aging calculation method provided by one or more embodiments of the present invention.

[0090] As Figure 1 shown, the fuel cell engine aging calculation method includes:

[0091] Step S1, collecting actual driving data of a fuel cell vehicle;

[0092] Step S2, cleaning the collected data;

[0093] Step S3, obtaining a physical model and fitting physical model parameters;

[0094] The fitting of physical model parameters includes substituting the actual data with current greater than the idle point current after cleaning and the initial reference data of the stack into the fuel cell polarization physical model for parameter fitting;

[0095] Step S4, obtaining a fuel cell current-voltage performance fitting curve and an initial state fuel cell current-voltage performance fitting curve according to the parameter fitting;

[0096] Step S5, calculating the aging degree of the fuel cell engine according to the fitting curve;

[0097] According to the aging degree of the fuel cell engine, formulating a strategy to slow down the performance degradation of the fuel cell;

[0098] The strategy to slow down the performance degradation of the fuel cell includes a strategy for controlling the operation of the fuel cell vehicle.

[0099] In this embodiment, collecting the actual driving data of a fuel cell vehicle includes: collecting the actual operating stack current and stack voltage data of the fuel cell engine of the fuel cell vehicle;

[0100] According to the actual driving data of the collected fuel cell vehicle, improve the dynamic adaptability of calculating the aging degree of the fuel cell engine.

[0101] Specifically, actual driving data from real vehicles is collected to enable the proposed aging calculation method to adapt to changing operating conditions in real time. The actual driving data from real vehicles contains information on multi-dimensional dynamic factors such as driving behavior, vehicle status, and road conditions. Using this information to calculate the aging of fuel-electric engines is more dynamically adaptable.

[0102] In this embodiment, cleaning the collected data includes: screening and eliminating abnormal values generated by interference from force majeure factors during data collection and data transmission;

[0103] Among them, obtaining fuel cell stack characteristic information when the battery vehicle is running;

[0104] Setting threshold ranges for fuel cell voltage and fuel cell current according to fuel cell stack characteristics;

[0105] Based on the data collection, draw a scatter plot of the fuel cell voltage and fuel cell current changing with time;

[0106] According to the data on the scatter plot exceeding the threshold interval, the data exceeding the threshold interval is eliminated;

[0107] It also includes obtaining box plots of data distribution and outliers;

[0108] Eliminate the data that deviates from the upper and lower edges of the box plot;

[0109] It also includes setting a data sampling time interval threshold;

[0110] Data is removed when the sampling time interval of the data is greater than the sampling time interval threshold.

[0111] In this embodiment, cleaning the collected data includes:

[0112] Based on the data collected, a polarization scatter plot of the fuel cell voltage versus fuel cell current time is drawn;

[0113] Determine the actual idle current of the fuel cell vehicle based on the polarization scatter plot;

[0114] For the current data greater than the idle point current and the voltage data corresponding to the current data, the polarization curve parameters are fitted using physical equations;

[0115] The physics equations include:

[0116] Where a represents the thermodynamic electromotive force; b represents the activation polarization loss coefficient; c represents the inverse of the exchange current density; d represents the ohmic polarization loss coefficient; e represents the concentration polarization loss coefficient; f represents the limiting current density; I represents the current; and V represents the voltage.

[0117] In this embodiment, calculating the aging degree of the fuel cell engine according to the fitting curve includes:

[0118] Determine the calculation current points;

[0119] Calculate the aging degree at each calculation current point;

[0120] Determine the weighting coefficients at each current point;

[0121] Calculate the comprehensive aging degree.

[0122] In this embodiment, determining the calculation current points includes:

[0123] Obtain the maximum reasonable current value Current max ;

[0124] According to the idle point current and the maximum reasonable current value Current max , set the current range;

[0125] Divide the current range greater than the idle point current and less than the maximum reasonable current value Current max into n equal parts;

[0126] Exclude the n - 1 current values outside the current range that do not include the idle point current and the maximum reasonable current value Current max as the current points participating in the calculation of the aging degree.

[0127] In this embodiment, calculating the aging degree at each calculation current point includes:

[0128] Substitute the determined current points participating in the calculation of the aging degree into the models of the fuel cell current - voltage performance fitting curve after parameter fitting and the initial - state fuel cell current - voltage performance fitting curve in step 3 to obtain the current - state voltage and the initial - state voltage at the current point;

[0129] According to the current - state voltage and the initial - state voltage at the current point, obtain the attenuation rate of the current - state voltage relative to the initial reference voltage;

[0130] Among them,

[0131] Denote the reference voltage value of the j - th current point as V Standard , the current - state voltage value of the j - th current point as V Now , and the attenuation degree of the voltage at the j - th current point as Degree_of_Aging j , then the expression of Degree_of_Aging j is:

[0132]

[0133] In this embodiment, determining the weighting coefficients at each current point includes:

[0134] Taking the probability density of the current interval with each current point as the mid-value and the length of each n-equal division interval length as the weight of the attenuation degree of each current point;

[0135] Among them, the frequency of the current interval with the j-th current point as the mid-value and the length of each n-equal division interval length in the actual data is denoted as Count_p_Slope j , the weight of the j-th current point is denoted as Weights j , then the expression of Weights j is:

[0136]

[0137] In this embodiment, calculating the comprehensive aging degree includes:

[0138] Multiplying the aging degree at each calculated current point by the weighting coefficients at each current point respectively and then summing them up to obtain the comprehensive aging degree of the fuel cell engine;

[0139] Among them, the aging degree of the fuel cell engine is denoted as Degree_of_Aging, and the expression of Degree_of_Aging is as follows:

[0140]

[0141] In this embodiment, the strategies for controlling the operation of the fuel cell vehicle include:

[0142] According to the increase in the comprehensive aging degree of the fuel cell engine, reducing the upper limit threshold of the fuel cell engine current;

[0143] It also includes, according to the increase in the comprehensive aging degree of the fuel cell engine, reducing the slope of the acceleration curve of the fuel cell vehicle operation.

[0144] Specifically, in one embodiment, according to the increase in the comprehensive aging degree of the fuel cell engine, the following strategies for reducing the upper limit threshold of the fuel cell engine current are set. When the comprehensive aging degree of the fuel cell engine is 3%-5%, it is defined as mild aging, and the upper limit threshold of the current is set to 90% of the original; when the comprehensive aging degree is 5%-10%, it is defined as moderate aging, and the upper limit threshold of the current is set to 85% of the original; when the comprehensive aging degree is greater than 10%, it is defined as severe aging, and the upper limit threshold of the current is set to 80% of the original. In the example, the initial current threshold is 700A, and the comprehensive aging degree of 3.77% belongs to mild aging, so the current threshold is dynamically adjusted to 630A.

[0145] In another embodiment, according to the increase in the comprehensive aging degree of the fuel cell engine, the following strategy for reducing the acceleration curve slope of the fuel cell vehicle operation is set. When the comprehensive aging degree of the fuel cell engine is 3%-5%, it is defined as mild aging, and the proportional limit of the vehicle demand power change over time is limited to 85%-95% of the original; when the comprehensive aging degree is 5%-10%, it is defined as moderate aging, and the proportional limit of the vehicle demand power change over time is limited to 50%-85% of the original; when the comprehensive aging degree is greater than 10%, it is defined as severe aging, and the proportional limit of the vehicle demand power change over time is limited to less than 50% of the original. In the example, the initial vehicle demand power change rate is 0.125, and the comprehensive aging degree is 3.77% which belongs to mild aging. The proportional adjustment of the vehicle demand power change over time to 90% of the original is 0.1125.

[0146] Figure 2 It is the structural diagram of the fuel cell engine aging calculation device provided by one or more embodiments of the present invention.

[0147] As Figure 2 shown, the fuel cell engine aging calculation device includes: a data collection module, a data cleaning module, a parameter fitting module, a fitting curve module, and an aging calculation module;

[0148] The data collection module is used to collect the actual driving data of the fuel cell vehicle;

[0149] The data cleaning module is used to clean the collected data;

[0150] The parameter fitting module is used to obtain a physical model and fit the physical model parameters;

[0151] The physical model parameter fitting includes substituting the actual data with current greater than the idle point current and the initial reference data of the stack into the fuel cell polarization physical model for parameter fitting respectively;

[0152] The fitting curve module is used to obtain the fuel cell current-voltage performance fitting curve and the initial state fuel cell current-voltage performance fitting curve according to the parameter fitting;

[0153] The aging calculation module is used to calculate the aging degree of the fuel cell engine according to the fitting curve;

[0154] According to the aging degree of the fuel cell engine, formulate a strategy to slow down the decline of fuel cell performance;

[0155] The strategy to slow down the decline of fuel cell performance includes the strategy to control the operation of the fuel cell vehicle.

[0156] It should be noted that although this system only discloses a data collection module, a data cleaning module, a parameter fitting module, a fitting curve module, and an aging calculation module, it does not mean that this device is only limited to the above basic functional modules. On the contrary, what the present invention intends to express is that on the basis of the above basic functional modules, those skilled in the art can arbitrarily add one or more functional modules in combination with the prior art to form an infinite number of embodiments or technical solutions. That is to say, this system is open rather than closed, and it cannot be considered that the protection scope of the claims of the present invention is limited to the above-disclosed basic functional modules just because only individual basic functional modules are disclosed in this embodiment.

[0157] Figure 3 It is a schematic diagram of the aging calculation strategy of a fuel cell engine in a specific embodiment of the present invention.

[0158] Figure 4 It is a schematic diagram of the process for calculating the aging degree of a fuel cell engine in a specific embodiment of the present invention.

[0159] Figure 5 It is a schematic diagram of polarization scatter points in the original vehicle data in a specific embodiment of the present invention.

[0160] In a specific embodiment, a method for calculating the aging of a fuel cell engine is disclosed, which is used to evaluate the aging degree under the actual operating conditions of a real vehicle, and includes the following steps:

[0161] Step 1, collect the real driving data of a fuel cell vehicle;

[0162] Step 2, clean the collected data;

[0163] Step 3, fit the physical model parameters, and substitute the actual data with current greater than the idle point and the initial reference data of the fuel cell stack into the fuel cell polarization physical model for parameter fitting respectively; obtain the fuel cell current-voltage performance fitting curve in the current state and the fuel cell current-voltage performance fitting curve in the initial state.

[0164] Step 4, calculate the aging degree of the fuel cell engine. As Figure 4 shown, the process for calculating the aging degree of the fuel cell engine is as follows:

[0165] Determine the calculation current points. First, equally divide the current range where the current is greater than the idle point and less than the maximum reasonable current value Current max into n equal parts, and use the remaining n - 1 current values that do not include the idle point and Current max as the current points for participating in the calculation of the aging degree;

[0166] Calculate the degree of aging at each calculated current point. Substitute the determined calculated current points into the two polarization curve models after parameter fitting in Step 3 to obtain the current state voltage and the initial state voltage at the calculated current point, so as to obtain the attenuation rate of the current voltage at the calculated current point compared with the initial reference voltage. Denote the reference voltage value of the j-th current point as V Standard , denote the current voltage value of the j-th current point as V Now , denote the attenuation degree of the voltage at the j-th current point as Degree_of_Aging j , then the expression of Degree_of_Aging j is as follows:

[0167]

[0168] Determine the weighting coefficient at each current point. Take the probability density of the current interval with each current point as the middle value and the length of each n-equal division interval length as the weight of the attenuation degree of each current point. Denote the frequency of the current interval with the j-th current point as the middle value and the length of each n-equal division interval length in the actual data as Count_p_Slope j , denote the weight of the j-th current point as Weights j , then the expression of Weights j is as follows:

[0169]

[0170] Calculate the comprehensive degree of aging. Multiply the degree of aging at each calculated current point by the weighting coefficient at each current point and then sum them up to obtain the comprehensive degree of aging of the fuel cell engine. Denote the degree of aging of the fuel cell engine as Degree_of_Aging, then the expression of Degree_of_Aging is as follows:

[0171]

[0172] In another specific embodiment, as Figure 3 shown, disclose a fuel cell engine aging calculation strategy, including the following steps:

[0173] Step 1, collect the actual operating stack current and stack voltage data of the fuel cell engine of the fuel cell vehicle.

[0174] The purpose of collecting the actual vehicle data in Step 1 is to make the proposed aging calculation method adapt to variable working conditions in real time. The actual vehicle driving data contains information on multi-dimensional dynamic factors such as driving behavior, vehicle state, and road conditions. Using this information to calculate the aging of the fuel cell engine has better dynamic adaptability. To ensure the real-time and accuracy of calculating the aging state, it is preferred to use the actual vehicle operation data in the recent two weeks.

[0175] In this embodiment, taking a fuel cell vehicle with a relatively high actual application frequency and diverse operating scenarios as an example, 5040 lines of real driving data from 2024.27 to 2024.28 (year. week) were collected. Some data fields and their related meanings of the actual data are shown in Table 1.

[0176] Table 1

[0177] Field Name Unit Field Meaning Data Acquisition Time - Signal Acquisition Time Fuel Cell Voltage V Stack Voltage Fuel Cell Current A Stack Current

[0178] Step 2: Clean the collected data. During the vehicle's driving process, the on-vehicle terminal reads the vehicle bus data in real time and transmits the data to the remote management platform through the mobile network at a certain sampling time. The data acquisition and data transmission processes may be interfered by various irresistible factors, resulting in outliers. When analyzing, the outliers need to be screened and removed.

[0179] Step 2 is to retain the valid data. By cleaning the outliers in the data, it is possible to prevent abnormal data from having an adverse impact on the analysis results and ensure the accuracy of the analysis results.

[0180] The process of screening abnormal data in this embodiment is as follows: (1) First, draw a scatter plot of the fuel cell voltage and fuel cell current changing with time to preliminarily check whether there are outliers in the data. Subsequently, according to the operating characteristics of the fuel cell stack provided by the stack, the reasonable value ranges of the fuel cell voltage and fuel cell current are restricted. The data points outside this range are identified as outliers and should be removed; (2) Then, view the data distribution and outlier information through a box plot. The data points that significantly deviate from the upper and lower edges of the box plot are identified as outliers and should be removed; (3) Check the time interval of the original data. Normally, the sampling time of the original data is 10s. However, due to the normal power on and off of the vehicle, the time interval between adjacent two lines of data should be no less than 10s. If data with a sampling interval less than 10s is found, the reliability of these data is at risk. To ensure the reliability of the data, these data also need to be removed. Clean the original data in the embodiment according to the above rules. After cleaning, the data is 4980 lines. After verification by drawing, the abnormal data of the fuel cell voltage and fuel cell current have been removed.

[0181] Step 3: Fit the physical model parameters. Substitute the actual data with current greater than the idle point after cleaning and the reference data of the stack into the fuel cell polarization physical model for parameter fitting.

[0182] Step 3 is to characterize the aging degree of the fuel cell system by the change of the physical model parameters fitted in the vehicle real-time data compared with the physical model parameters of the reference data. Due to the actual driving characteristics of fuel cell vehicles, during the stack startup process, the working medium supply gradually starts, the voltage gradually rises, and the fuel cell voltage values corresponding to the fuel cell current values less than the idle current point in the original vehicle data fluctuate greatly, and the actual current-voltage relationship does not satisfy the physical model, affecting the accuracy of fitting. Therefore, it is necessary to remove the current-voltage data before the idle current. The actual idle current is determined by observing the voltage fluctuation degree at each current point in the polarization scatter plot. The specific operation is to draw the polarization scatter plot of the fuel cell voltage changing with the fuel cell current time to judge the real idle point of the fuel cell vehicle, and perform parameter fitting on the current greater than the idle point and the voltage corresponding to the current with a physical equation.

[0183] In this embodiment, the polarization scatter points in the original vehicle data are as Figure 5 shown. It can be seen from the figure that the fuel cell voltage values corresponding to the current points less than 50 fluctuate greatly. Therefore, it is determined that the idle current point is 50, and the physical equation is used for polarization curve fitting, where the values of a, b, and c are not restricted, and it is required that the parameters d and e are less than 0, and the minimum value of the f value is Current max +100, and the maximum value is Current max +200. The maximum reasonable current value Current max selects the rated current value of the stack design to be 700.

[0184] Step 4, calculate the aging degree of the fuel cell engine. First, divide the current range where the current is greater than the idle point and less than the

[0185] maximum reasonable current value Current max into n equal parts, substitute the remaining n - 1 current values that do not include the idle point and Current max into the two polarization curve models after parameter fitting in Step 3 to obtain the corresponding voltage values, then calculate the attenuation rate of the current voltage at the n - 1 current points compared with the reference voltage respectively, and finally perform weighted summation on the attenuation rates at the n - 1 current points to obtain the aging degree of the fuel cell engine.

[0186] Step 4 is to calculate the aging degree of the fuel cell engine. The current range of the actual operation of the vehicle is discretized into n equal parts. By performing weighted summation on the attenuation rates of the current voltage at the n - 1 current points compared with the reference voltage, the aging degree of the fuel cell engine can be obtained. Denote the aging degree of the fuel cell engine as Degree_of_Aging, and the attenuation degree of the voltage at the jth current point as Degree_of_Aging j , and the weight of the jth current point as Weightsj , the reference voltage value of the j-th current point is denoted as V Standard , the current voltage value of the j-th current point is denoted as V Now .

[0187]

[0188] In this embodiment, n is 8, the current interval (50, 700) is discretized, and the 7 points are 131.25, 212.5, 293.75, 375, 456.25, 537.5, and 618.75 respectively. Taking each current point as the median value, the probability density of the current interval with a length of each 8-equal division interval length is uniformly distributed. Therefore, the weighting coefficients are the same, and the aging degree of the vehicle's fuel cell engine is 3.77%. The reference voltage, current voltage of each current point, and the attenuation degree of the voltage under each current point are shown in Table 2 below, showing the attenuation situation of each current point of the example vehicle.

[0189] Table 2

[0190]

[0191] In the above embodiment, the main technical route is as follows:

[0192] (1) When calculating the aging of the fuel cell engine, the actual operation data of the fuel cell engine is used.

[0193] (2) The screening rules during the cleaning of the original data.

[0194] (3) When fitting the physical model parameters, is used for polarization physical model fitting, and the parameters can characterize the aging factors. Among them, the values of a, b, and c have no restrictions. It is required that the parameters d and e are less than 0, and the minimum value of the f value is Current max +100, and the maximum value is Current max +200.

[0195] (4) For the accuracy of the physical model fitting, the data in the original vehicle data greater than the idle current point is retained and analyzed. First, the true idle point of the fuel cell vehicle is judged by drawing the polarization scatter plot of the fuel cell voltage changing with the fuel cell current time, and the current greater than the idle point and the voltage corresponding to the current are used for parameter fitting with physical equations.

[0196] (5) A calculation method for the aging of the fuel cell engine is proposed, which combines physical models and data statistical analysis, and has the interpretability of the aging cause, high fidelity, and high calculation efficiency. First, the current interval where the current is greater than the idle point and less than the maximum reasonable current value Current max is divided into n equal parts, and the idle point and Current are not includedmax The remaining n - 1 current values are respectively substituted into the two polarization curve models after parameter fitting to obtain the corresponding voltage values. Then, the decay rates of the current voltages at the n - 1 current points relative to the reference voltage are calculated respectively. Finally, the decay rates at the n - 1 current points are weighted and summed to obtain the aging degree of the fuel cell engine.

[0197] (6) Method for determining the weighting coefficient at each current point. The current operating range of the fuel cell engine is wide, and there may be significant differences in the commonly used operating currents of different fuel cell engines. At each current point, the aging degree of the fuel cell is different. By setting the weighting coefficient, the influence on the aging degree of the fuel cell engine at different currents can be adjusted, and the aging state of the fuel cell can be more accurately indicated.

[0198] Figure 6 It is a structural block diagram of an electronic device for the fuel cell engine aging calculation method provided by one or more embodiments of the present invention.

[0199] As Figure 6 shown, the present application provides an electronic device, including: a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus;

[0200] A computer program is stored in the memory. When the computer program is executed by the processor, the processor executes the steps of the fuel cell engine aging calculation method.

[0201] The present application also provides a computer - readable storage medium, which stores the steps of the fuel cell engine aging calculation method executable by an electronic device.

[0202] The present application also provides a simulation platform, including:

[0203] An electronic device for implementing the steps of the fuel cell engine aging calculation method;

[0204] A processor that runs a program. When the program runs, it executes the steps of the fuel cell engine aging calculation method on the data output from the electronic device;

[0205] A storage medium for storing a program that executes the steps of the fuel cell engine aging calculation method on the data output from the electronic device when the program runs.

[0206] As can be seen from the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present application.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the aging of a fuel cell engine, characterized in that, The fuel cell engine aging calculation method includes: Collect the actual driving data of the fuel cell vehicle; Clean the collected data; Obtain the physical model and fit the physical model parameters; The physical model parameter fitting includes substituting the actual data with current greater than the idle point current after cleaning and the initial reference data of the fuel cell stack into the fuel cell polarization physical model for parameter fitting respectively; According to the parameter fitting, obtain the fuel cell current-voltage performance fitting curve and the initial state fuel cell current-voltage performance fitting curve; Calculate the aging degree of the fuel cell engine according to the fitting curve; According to the aging degree of the fuel cell engine, formulate a strategy to slow down the performance degradation of the fuel cell; The strategy to slow down the performance degradation of the fuel cell includes the strategy to control the operation of the fuel cell vehicle.

2. The aging calculation method of the fuel cell engine according to claim 1, wherein, The collection of the actual driving data of the fuel cell vehicle includes: collecting the actual operating stack current and stack voltage data of the fuel cell engine of the fuel cell vehicle; According to the collection of the actual driving data of the fuel cell vehicle, improve the dynamic adaptability of calculating the aging degree of the fuel cell engine.

3. The fuel cell engine aging calculation method according to claim 2, characterized in that, The cleaning of the collected data includes: based on the outliers generated by the interference of irresistible factors in the data acquisition and data transmission process, screening and removing the outliers; Among them, obtain the fuel cell stack characteristic information when the battery vehicle is running; Set the threshold intervals for the fuel cell voltage and the fuel cell current according to the fuel cell stack characteristics; According to the data collection, draw the data scatter plot of the fuel cell voltage and the fuel cell current changing with time; According to the data on the scatter plot exceeding the threshold interval, remove the data exceeding the threshold interval; It also includes obtaining the box plot of the data distribution state and outliers; Remove the data deviating from the upper and lower edges of the box plot; It also includes setting the data sampling time interval threshold; According to the sampling data time interval being greater than the sampling time interval threshold, perform data removal.

4. The method for calculating the aging of a fuel cell engine according to claim 3, characterized in that, The cleaning of the collected data includes: According to the data collection, draw the polarization scatter plot of the fuel cell voltage changing with the fuel cell current time; Judge the true idle point current of the fuel cell vehicle according to the polarization scatter plot; For the current data greater than the idle point current and the voltage data corresponding to the current data, perform polarization curve parameter fitting with physical equations; The physical equations include: Among them, a represents the thermodynamic electromotive force; b represents the activation polarization loss coefficient; c represents the reciprocal of the exchange current density; d represents the ohmic polarization loss coefficient; e represents the concentration polarization loss coefficient; f represents the limiting current density; I represents the current; V represents the voltage.

5. The method for calculating the aging of a fuel cell engine according to claim 4, wherein, The calculation of the aging degree of the fuel cell engine according to the fitting curve includes: Determine the calculation current points; Calculate the aging degree at each calculation current point; Determine the weighting coefficients at each current point; Calculate the comprehensive aging degree.

6. The fuel cell engine aging calculation method according to claim 5, characterized in that, The determination of the calculation current points includes: Obtain the maximum reasonable current value Current max ; Based on the idle point current and the maximum reasonable current value Current max , set the current range; Divide the current range greater than the idle point current and less than the maximum reasonable current value Current max into n equal parts; Exclude the idle point current and the maximum reasonable current value Current max The n - 1 current values outside the current range are used as the current points for calculating the aging degree.

7. The fuel cell engine aging calculation method according to claim 6, wherein The calculation of the aging degree at each calculation current point includes: Substitute the determined current points participating in the aging degree calculation into the models of the fuel cell current-voltage performance fitting curve and the initial state fuel cell current-voltage performance fitting curve after parameter fitting in step 3 respectively to obtain the current state voltage and the initial state voltage at the current point; Obtain the attenuation rate of the current voltage relative to the initial reference voltage at the current point based on the current state voltage and the initial state voltage at the current point; Among them, Denote the reference voltage value of the j-th current point as V Standard , and denote the current voltage value of the j-th current point as V Now . Denote the attenuation degree of the voltage at the j-th current point as Degree_of_Aging j . Then the expression of Degree_of_Aging j is as follows:

8. The method for calculating the aging of a fuel cell engine according to claim 7, characterized in that, The determination of the weighting coefficients at each current point includes: Taking the probability density of the current interval with each current point as the midpoint and a length of the length of each n-equal division interval as the weight of the attenuation degree of each current point; Among them, the frequency count of the current interval with the j-th current point as the median and a length equal to the length of each n-equal division interval in the actual data is denoted as Count_p_Slope j , and the weight of the j-th current point is denoted as Weights j , then the expression of Weights j is:

9. The method for calculating the aging of a fuel cell engine according to claim 8, wherein The calculation of the comprehensive aging degree includes: Multiply the aging degrees at each calculated current point by the weighting coefficients at each current point respectively and then sum them up to obtain the comprehensive aging degree of the fuel cell engine; Among them, if the aging degree of the fuel cell engine is denoted as Degree_of_Aging, the expression of Degree_of_Aging is as follows:

10. The fuel cell engine aging calculation method according to claim 9, wherein The strategy for controlling the operation of the fuel cell vehicle includes: According to the increase in the comprehensive aging degree of the fuel cell engine, reduce the upper limit threshold of the current of the fuel cell engine; It also includes, according to the increase in the comprehensive aging degree of the fuel cell engine, reducing the slope of the acceleration curve of the fuel cell vehicle operation.

Images