Method and system for evaluating driving range and energy efficiency performance of fuel cell vehicle

Abstract

The invention provides a fuel cell vehicle driving range and energy efficiency performance evaluation method and system, and the method comprises the steps: calculating a plurality of initial evaluation indexes, and carrying out the standardization processing, and obtaining a standardized evaluation index; performing principal component analysis on the plurality of standardized evaluation indexes to obtain a main evaluation index and a corresponding contribution rate, and determining a target evaluation index of the target fuel cell vehicle; calculating an evaluation result based on the target evaluation index and the corresponding contribution rate; a plurality of initial evaluation indexes are calculated and standardized, principal component analysis is performed based on the standardized evaluation indexes to obtain a main evaluation index and a corresponding contribution rate, a target evaluation index is determined according to the main evaluation index and the corresponding contribution rate, and an evaluation result is calculated based on the target evaluation index and the corresponding contribution rate. Redundant features are removed on the basis of comprehensively considering multiple evaluation indexes of the target fuel cell vehicle, so that the evaluation accuracy is improved while the evaluation complexity is reduced.

Description

Technical Field

[0001] This application relates to the technical field of the evaluation of fuel cell vehicles, and particularly relates to a method and system for evaluating the cruising range and energy efficiency performance of fuel cell vehicles. Background Art

[0002] The emergence of new energy vehicles powered by fuel cells has reduced the dependence of traditional vehicles on limited fossil fuels and improved the diversification and sustainability of energy; a hydrogen-oxygen fuel cell is a device that converts hydrogen and oxygen into electrical energy, and the internal chemical reactions mainly include the oxidation reaction of hydrogen and the reduction reaction of oxygen. The cruising range and energy efficiency performance are important indicators for evaluating the performance of hydrogen-oxygen fuel cells. Compared with traditional fuel vehicles, the energy efficiency relationship of fuel cells in new energy vehicles has become a key issue that attracts much attention.

[0003] Currently, the evaluation of the cruising range and energy efficiency performance of fuel cell vehicles is mostly based on a single indicator, without fully considering the correlation between multiple factors, or multiple evaluation indicators are used without fully considering the redundancy between multiple evaluation indicators, resulting in a relatively high evaluation complexity. Therefore, a method that can comprehensively consider multiple indicators to accurately evaluate the cruising range and energy efficiency performance of fuel cell vehicles is needed. Summary of the Invention

[0004] To solve the above technical problems, this application is proposed. Embodiments of this application provide a method and system for evaluating the cruising range and energy efficiency performance of fuel cell vehicles.

[0005] According to one aspect of this application, a method for evaluating the cruising range and energy efficiency performance of fuel cell vehicles is provided, including: calculating a plurality of initial evaluation indicators of a target fuel cell vehicle; wherein, the plurality of initial evaluation indicators include an energy consumption per unit mass evaluation indicator, a hydrogen consumption rate evaluation indicator, a comprehensive cruising range evaluation indicator, and an average comprehensive transmission efficiency evaluation indicator, the energy consumption per unit mass evaluation indicator represents the average power consumption per unit calculated according to the vehicle mass of the target fuel cell vehicle, the hydrogen consumption rate evaluation indicator represents the hydrogen consumption per unit mileage of the target fuel cell vehicle, the comprehensive cruising range evaluation indicator represents the comprehensive cruising range of the target fuel cell vehicle, and the average comprehensive transmission efficiency evaluation indicator represents the average transmission efficiency of the target fuel cell vehicle; performing standardization processing on the plurality of initial evaluation indicators to obtain standardized evaluation indicators; performing principal component analysis on the plurality of standardized evaluation indicators to obtain principal evaluation indicators and corresponding contribution rates; determining the target evaluation indicators of the target fuel cell vehicle based on the principal evaluation indicators and corresponding contribution rates; and calculating an evaluation result of the target fuel cell vehicle based on the target evaluation indicators and corresponding contribution rates.

[0006] In one embodiment, the calculation of multiple initial evaluation indicators for the target fuel cell vehicle includes: The calculation formula for the unit mass energy consumption evaluation indicator is: ; where, E m is the unit mass energy consumption, E is the total energy consumption, m is the curb weight of the target fuel cell vehicle.

[0007] In one embodiment, the calculation of multiple initial evaluation indicators for the target fuel cell vehicle includes: The calculation formula for the hydrogen consumption rate evaluation indicator is: ; ; ; where, is the hydrogen consumption rate, is the hydrogen consumption, is the corrected hydrogen consumption, D is the driving range, is the temperature correction factor of the consumption rate, is the set temperature of the thermostat of the fuel cell cooling system, is the fuel cell temperature, is the initial ambient temperature.

[0008] In one embodiment, the calculation of multiple initial evaluation indicators for the target fuel cell vehicle includes: The calculation formula for the comprehensive driving range evaluation indicator is: ； ； ； ； ； where, is the comprehensive driving range, is the driving range contributed by the fuel cell system, is the driving range contributed by the power battery, is the influence factor of the driving mode, indicating the usage efficiency of the hybrid system of the target fuel cell vehicle, is the temperature correction factor of the driving range, is the proportion of the energy contributed by the fuel cell system, The proportion of energy contributed to the power system The energy contributed to the fuel cell system The energy contributed to the power battery D The driving range

[0009] In one embodiment, the multiple initial evaluation indexes calculated for the target fuel cell vehicle include: The calculation formula for the average comprehensive transmission efficiency evaluation index is: ; Wherein, is the average comprehensive transmission efficiency, is the temperature correction factor of the efficiency, is the theoretical value of the total driving energy under the cycle condition, represents the increased energy in the battery after the cycle condition ends, is the energy contained in the consumed hydrogen, is the energy regeneratively braked and charged into the battery, is the decreased energy in the battery after the cycle condition ends, is the average discharge efficiency of the battery, is the fuel cell efficiency.

[0010] In one embodiment, the standardization processing of the multiple initial evaluation indexes to obtain the standardized evaluation indexes includes: After normalizing the multiple initial evaluation indexes of multiple target fuel cell vehicles, an evaluation sample matrix is obtained; wherein, the elements in the evaluation sample matrix represent the normalized initial evaluation indexes of the corresponding target fuel cell vehicles.

[0011] In one embodiment, the principal component analysis of the multiple standardized evaluation indexes to obtain the principal evaluation indexes and the corresponding contribution rates includes: constructing the covariance matrix of the evaluation sample matrix; calculating the eigenvalues of the covariance matrix; and determining the principal evaluation indexes and the corresponding contribution rates based on the eigenvalues of the covariance matrix.

[0012] In one embodiment, the determination of the target evaluation indexes of the target fuel cell vehicle based on the principal evaluation indexes and the corresponding contribution rates includes: arranging the eigenvalues of the covariance matrix in descending order; sequentially calculating the sum of the contribution rates corresponding to the principal evaluation indexes corresponding to multiple eigenvalues to obtain the cumulative contribution rate; if the cumulative contribution rate is greater than the preset contribution rate threshold, then the multiple principal evaluation indexes corresponding to the cumulative contribution rate are used as the target evaluation indexes.

[0013] In one embodiment, calculating the evaluation result of the target fuel cell vehicle based on the target evaluation index and the corresponding contribution rate includes: performing weighted summation on the target evaluation index based on the contribution rate of the target evaluation index to obtain the evaluation result of the target fuel cell vehicle.

[0014] According to another aspect of the present application, there is provided an evaluation system for the cruising range and energy efficiency performance of a fuel cell vehicle, including: an initial index calculation module for calculating a plurality of initial evaluation indexes of the target fuel cell vehicle; wherein, the plurality of initial evaluation indexes include an evaluation index of energy consumption per unit mass, a hydrogen consumption rate evaluation index, a comprehensive cruising range evaluation index, and an average comprehensive transmission efficiency evaluation index. The evaluation index of energy consumption per unit mass represents the average power consumption per unit calculated according to the vehicle mass of the target fuel cell vehicle. The hydrogen consumption rate evaluation index represents the hydrogen consumption per unit mileage of the target fuel cell vehicle. The comprehensive cruising range evaluation index represents the comprehensive cruising range of the target fuel cell vehicle. The average comprehensive transmission efficiency evaluation index represents the average transmission efficiency of the target fuel cell vehicle; an index standardization module for performing standardization processing on the plurality of initial evaluation indexes to obtain standardized evaluation indexes; a main evaluation index analysis module for performing principal component analysis on the plurality of standardized evaluation indexes to obtain main evaluation indexes and corresponding contribution rates; a target evaluation index determination module for determining the target evaluation index of the target fuel cell vehicle based on the main evaluation index and the corresponding contribution rate; an evaluation result calculation module for calculating the evaluation result of the target fuel cell vehicle based on the target evaluation index and the corresponding contribution rate.

[0015] An evaluation method and system for the cruising range and energy efficiency performance of a fuel cell vehicle provided by the present application calculate multiple initial evaluation indicators of the target fuel cell vehicle; among them, the multiple initial evaluation indicators include an energy consumption per unit mass evaluation indicator, a hydrogen consumption rate evaluation indicator, a comprehensive cruising range evaluation indicator, and an average comprehensive transmission efficiency evaluation indicator. The energy consumption per unit mass evaluation indicator represents the average power consumption per unit calculated according to the vehicle mass of the target fuel cell vehicle. The hydrogen consumption rate evaluation indicator represents the hydrogen consumption per unit mileage of the target fuel cell vehicle. The comprehensive cruising range evaluation indicator represents the comprehensive cruising range of the target fuel cell vehicle. The average comprehensive transmission efficiency evaluation indicator represents the average transmission efficiency of the target fuel cell vehicle. Standardize the multiple initial evaluation indicators to obtain standardized evaluation indicators. Perform principal component analysis on the multiple standardized evaluation indicators to obtain the main evaluation indicators and their corresponding contribution rates. Based on the main evaluation indicators and their corresponding contribution rates, determine the target evaluation indicators of the target fuel cell vehicle. Based on the target evaluation indicators and their corresponding contribution rates, calculate the evaluation result of the target fuel cell vehicle; that is, calculate multiple initial evaluation indicators of the target fuel cell vehicle and perform standardization processing, and perform principal component analysis based on the standardized evaluation indicators to obtain the main evaluation indicators and their corresponding contribution rates, determine the target evaluation indicators according to the main evaluation indicators and their corresponding contribution rates, and calculate the evaluation result based on the target evaluation indicators and their corresponding contribution rates. Remove redundant features while comprehensively considering multiple evaluation indicators of the target fuel cell vehicle, so as to reduce the evaluation complexity and improve the evaluation accuracy at the same time. Description of the Drawings

[0016] By describing the embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. The drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. They are used together with the embodiments of the present application to explain the present application and do not constitute a limitation to the present application. In the drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 It is a flowchart of an evaluation method for the cruising range and energy efficiency performance of a fuel cell vehicle provided by an exemplary embodiment of the present application.

[0018] Figure 2 It is a structural diagram of an evaluation system for the cruising range and energy efficiency performance of a fuel cell vehicle provided by an exemplary embodiment of the present application.

[0019] Figure 3 It is a structural diagram of an electronic device provided by an exemplary embodiment of the present application. Detailed Embodiments

[0020] Next, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. It should be understood that the present application is not limited by the exemplary embodiments described herein.

[0021] Figure 1 is a schematic flowchart of an evaluation method for the cruising range and energy efficiency performance of a fuel cell vehicle provided by an exemplary embodiment of the present application. As Figure 1 shown, the evaluation method for the cruising range and energy efficiency performance of the fuel cell vehicle includes the following steps: Step 110: Calculate a plurality of initial evaluation indicators of the target fuel cell vehicle.

[0022] Among them, the plurality of initial evaluation indicators include the unit mass energy consumption evaluation indicator, the hydrogen consumption rate evaluation indicator, the comprehensive cruising range evaluation indicator, and the average comprehensive transmission efficiency evaluation indicator. The unit mass energy consumption evaluation indicator represents the average unit power consumption of the target fuel cell vehicle calculated according to the vehicle mass. The hydrogen consumption rate evaluation indicator represents the hydrogen consumption per unit mileage of the target fuel cell vehicle. The comprehensive cruising range evaluation indicator represents the comprehensive cruising range of the target fuel cell vehicle. The average comprehensive transmission efficiency evaluation indicator represents the average transmission efficiency of the target fuel cell vehicle. According to the working principle and performance characteristics of the target fuel cell vehicle, the present application comprehensively considers the influencing factors of its cruising range and selects a plurality of initial evaluation indicators, including the unit mass energy consumption evaluation indicator and the hydrogen consumption rate evaluation indicator considered from the dimension of fuel economy, the comprehensive cruising range evaluation indicator considered from the dimension of practical applicability, and the average comprehensive transmission efficiency evaluation indicator considered from the dimension of environmental benefits.

[0023] Step 120: Perform standardization processing on the plurality of initial evaluation indicators to obtain standardized evaluation indicators.

[0024] Since different evaluation indicators have different units and dimensions, directly performing weighted averaging will affect the accuracy of the calculation. Therefore, the present application performs standardization processing on these initial evaluation indicators to obtain standardized evaluation indicators, so as to facilitate the calculation of subsequent evaluation results.

[0025] Step 130: Perform principal component analysis on the plurality of standardized evaluation indicators to obtain the main evaluation indicators and their corresponding contribution rates.

[0026] The present application performs principal component analysis on the plurality of standardized evaluation indicators to determine the main factors that affect the cruising range and energy efficiency performance of the target fuel cell vehicle, that is, the main evaluation indicators, and calculates the contribution rate of each main evaluation indicator.

[0027] Step 140: Determine the target evaluation indicators of the target fuel cell vehicle based on the main evaluation indicators and their corresponding contribution rates.

[0028] After determining the main evaluation index and its corresponding contribution rate in this application, the target evaluation index of the target fuel cell vehicle is determined according to the main evaluation index and its corresponding contribution rate, so as to reduce the calculation difficulty while ensuring the evaluation accuracy.

[0029] Step 150: Calculate the evaluation result of the target fuel cell vehicle based on the target evaluation index and its corresponding contribution rate.

[0030] After determining the target evaluation index and its corresponding contribution rate in this application, the evaluation result of the target fuel cell vehicle is calculated according to the target evaluation index and its corresponding contribution rate.

[0031] An evaluation method for the cruising range and energy efficiency performance of a fuel cell vehicle provided by this application calculates multiple initial evaluation indexes of the target fuel cell vehicle; among them, the multiple initial evaluation indexes include the unit mass energy consumption evaluation index, the hydrogen consumption rate evaluation index, the comprehensive cruising range evaluation index, and the average comprehensive transmission efficiency evaluation index. The unit mass energy consumption evaluation index represents the average unit power consumption calculated according to the vehicle mass of the target fuel cell vehicle. The hydrogen consumption rate evaluation index represents the hydrogen consumption per unit mileage of the target fuel cell vehicle. The comprehensive cruising range evaluation index represents the comprehensive cruising range of the target fuel cell vehicle. The average comprehensive transmission efficiency evaluation index represents the average transmission efficiency of the target fuel cell vehicle; perform standardization processing on the multiple initial evaluation indexes to obtain standardized evaluation indexes; perform principal component analysis on the multiple standardized evaluation indexes to obtain the main evaluation index and its corresponding contribution rate; determine the target evaluation index of the target fuel cell vehicle based on the main evaluation index and its corresponding contribution rate; calculate the evaluation result of the target fuel cell vehicle based on the target evaluation index and its corresponding contribution rate; that is, calculate multiple initial evaluation indexes of the target fuel cell vehicle and perform standardization processing, and perform principal component analysis based on the standardized evaluation indexes to obtain the main evaluation index and its corresponding contribution rate, determine the target evaluation index according to the main evaluation index and its corresponding contribution rate, and calculate the evaluation result based on the target evaluation index and its corresponding contribution rate, removing redundant features while comprehensively considering multiple evaluation indexes of the target fuel cell vehicle, so as to improve the evaluation accuracy while reducing the evaluation complexity.

[0032] In one embodiment, the specific implementation manner of the above step 110 may be: The calculation formula of the unit mass energy consumption evaluation index is: ; Wherein, E m is the unit mass energy consumption, E is the total energy consumption, m is the curb weight of the target fuel cell vehicle.

[0033] The evaluation index of energy consumption per unit mass can directly reflect the energy utilization efficiency of the target fuel cell vehicle during driving. A low energy consumption per unit energy means that the power system of the target fuel cell vehicle can convert energy more efficiently and extend the driving range. Considering the influence of high and low temperatures on efficiency, temperature affects the working efficiency of fuel cells. In particular, problems such as poor heat dissipation and overheating may occur at high temperatures, or the reaction efficiency may decrease at low temperatures. Therefore, the average power consumption per unit calculated according to the vehicle mass can quantify the specific influence of high and low temperatures on fuel cell efficiency.

[0034] In one embodiment, the specific implementation manner of the above step 110 may be: The calculation formula of the hydrogen consumption rate evaluation index is: ; ; ; Wherein, is the hydrogen consumption rate, is the hydrogen consumption, is the corrected hydrogen consumption, D is the driving mileage, is the temperature correction factor of the consumption rate, is the set temperature of the thermostat of the fuel cell cooling system, is the fuel cell temperature, is the initial ambient temperature.

[0035] The hydrogen consumption rate directly reflects the hydrogen utilization efficiency of the target fuel cell vehicle. In high or low temperature environments, the storage and consumption of hydrogen will be affected by temperature. Therefore, comparing the hydrogen consumption rates at different temperatures can effectively evaluate the performance of the target fuel cell vehicle in different environments. Considering the influence of temperature on hydrogen storage and consumption, at high temperatures, the density of hydrogen storage will decrease and the gasification rate will increase, which may lead to an acceleration of hydrogen consumption; at low temperatures, the fluidity and gasification rate of hydrogen may decrease, affecting the hydrogen supply efficiency. Therefore, this application can reveal the specific influence of temperature changes on hydrogen consumption through this index.

[0036] In one embodiment, the specific implementation manner of the above step 110 may be: The calculation formula of the comprehensive driving range evaluation index is: ； ； ； ； ； Among them, is the comprehensive driving range, is the driving range contributed by the fuel cell system, is the driving range contributed by the power battery, is the influence factor of the driving mode, indicating the usage efficiency of the target fuel cell vehicle hybrid system, is the temperature correction factor of the driving range, is the energy contribution ratio of the fuel cell system, is the energy contribution ratio of the power system, is the contributed energy of the fuel cell system, is the contributed energy of the power battery, D is the driving mileage.

[0037] The comprehensive driving range can reflect the actual driving ability of the target fuel cell vehicle in high and low temperature environments, comprehensively considering multiple aspects such as energy consumption, hydrogen utilization rate, and system efficiency; for the comprehensive consideration of the influence of high and low temperatures, both high and low temperatures will affect the overall performance of the target fuel cell vehicle, especially the consumption of hydrogen, system efficiency, and battery performance. Therefore, through this index, this application can comprehensively evaluate the difference in driving range under different environmental conditions and comprehensively evaluate the actual driving range under different environmental temperatures.

[0038] In one embodiment, the specific implementation manner of the above step 110 may be: The calculation formula of the average comprehensive transmission efficiency evaluation index is: ; Among them, is the average comprehensive transmission efficiency, is the temperature correction factor of the efficiency, is the theoretical value of the total driving energy of the cycle working condition, represents the increased energy in the battery after the cycle working condition ends, is the energy contained in the consumed hydrogen, is the energy regenerative braking charged into the battery, is the decreased energy in the battery after the cycle working condition ends, is the average discharge efficiency of the battery, is the fuel cell efficiency.

[0039] Temperature changes not only affect the efficiency of a single component, but also the performance of the entire energy system. The average comprehensive transmission efficiency can provide an overall performance evaluation, revealing the impact of high or low temperatures on each subsystem of the target fuel cell vehicle. Second, the impacts of high and low temperatures on each component are different: in a high-temperature environment, the energy efficiency of the thermal management system will decline, which may lead to an increase in the energy consumption of the cooling system; in a low-temperature environment, the efficiency of the fuel cell stack will decline. The average comprehensive transmission efficiency can help identify and quantify these impacts, thereby optimizing the design of the target fuel cell vehicle. In this application, the energy utilization efficiency of the target fuel cell vehicle is evaluated through the analysis of the average comprehensive transmission efficiency at different temperatures.

[0040] Preferably, during the test of the cruising range of the target fuel cell vehicle (to calculate the above-mentioned multiple initial evaluation indicators based on the measured corresponding parameters), in order to eliminate the interference of temperature on the test results, this application dynamically corrects the resistance parameters at different ambient temperatures according to the temperature, so as to dynamically correct parameters such as the fuel cell system efficiency, hydrogen consumption rate, and transmission energy consumption, and then affect the above-mentioned initial evaluation indicators. Specifically, the correction formula for the resistance parameters is as follows: ; Where, is the converted driving resistance, v is the vehicle speed, t is the average air temperature on the test road, p is the average atmospheric pressure on the test road, is the rolling resistance temperature correction coefficient, taking 0.00864 for light vehicles and 0.006 for medium and heavy vehicles, , , are constants obtained by fitting the results of actual coast-down tests.

[0041] In one embodiment, the specific implementation manner of the above step 120 may be: after normalizing multiple initial evaluation indicators of multiple target fuel cell vehicles, an evaluation sample matrix is obtained; wherein, the elements in the evaluation sample matrix represent the normalized initial evaluation indicators of the corresponding target fuel cell vehicle.

[0042] This application uses range normalization to normalize the data of each initial evaluation indicator to the interval [0, 1], so that the values of each initial evaluation indicator are within the same dimension range, and the dimension differences between the indicators are removed. The specific normalization formula is: ; Where, X is the value before normalization, X norm is the value after normalization, X maxis the maximum value of the initial evaluation index, X min is the minimum value of the initial evaluation index.

[0043] And the normalized initial evaluation indexes are combined to obtain an evaluation sample matrix (illustrated below with three fuel cell experimental vehicles as an example): ; Among them, represents the i th normalized j th initial evaluation index of the target fuel cell vehicle, 1 ≤ i ≤ 3, 1 ≤ j ≤ 4.

[0044] In one embodiment, the specific implementation manner of the above step 130 may be: constructing a covariance matrix of the evaluation sample matrix; calculating the eigenvalues of the covariance matrix; determining the main evaluation indexes and the corresponding contribution rates based on the eigenvalues of the covariance matrix.

[0045] After the evaluation sample matrix is obtained through standardization processing in this application, a covariance matrix of the evaluation sample matrix is further constructed, where the covariance matrix is: ; Among them, n is the number of fuel cell experimental vehicles (for example, 3); is the transposed matrix of the evaluation sample matrix .

[0046] Taking n = 3 as an example, the covariance matrix is: ; By calculating the eigenvalues C of the covariance matrix , p≤4 .

[0047] According to the eigenvalues, the corresponding main evaluation indexes (corresponding to the eigenvalues) are determined, and the contribution rate of each main evaluation index is calculated. Among them, the calculation formula of the contribution rate is as follows: ; Among them, is the contribution rate of the i th main evaluation index.

[0048] In one embodiment, the specific implementation of the above step 140 may be: arranging the eigenvalues of the covariance matrix in descending order; successively calculating the sum of the contribution rates corresponding to multiple main evaluation indicators corresponding to the eigenvalues to obtain the cumulative contribution rate; if the cumulative contribution rate is greater than a preset contribution rate threshold, then using the multiple main evaluation indicators corresponding to the cumulative contribution rate as the target evaluation indicators.

[0049] This application can arrange the eigenvalues of the covariance matrix from large to small, and by calculating the sum of the contribution rates of multiple main evaluation indicators ranked at the top. For example, it is required that the sum of the contribution rates of the selected multiple main evaluation indicators is greater than 85% to ensure that the selected main evaluation indicators include most of the information of the initial evaluation indicators. Therefore, this application can stop by successively accumulating until the cumulative contribution rate is greater than the preset contribution rate threshold, and use the main evaluation indicators corresponding to the multiple contribution rates participating in the accumulation as the target evaluation indicators.

[0050] In one embodiment, the specific implementation of the above step 150 may be: performing weighted summation on the target evaluation indicators based on the contribution rates of the target evaluation indicators to obtain the evaluation result of the target fuel cell vehicle.

[0051] After this application determines the target evaluation indicators, it performs weighted summation according to the target evaluation indicators and their corresponding contribution rates to obtain the evaluation result of the target fuel cell vehicle. The specific calculation formula is as follows: ; Wherein, F is the evaluation result (i.e., score) of the target fuel cell vehicle, is the i th target evaluation indicator, is the i th contribution rate of the target evaluation indicator.

[0052] Figure 2 FIG. is a schematic structural diagram of an evaluation system for the driving range and energy efficiency performance of a fuel cell vehicle provided by an exemplary embodiment of this application. As Figure 2As shown, the evaluation system 20 for the driving range and energy efficiency performance of the fuel cell vehicle includes: an initial index calculation module 21 for calculating a plurality of initial evaluation indexes of the target fuel cell vehicle; wherein, the plurality of initial evaluation indexes include an energy consumption per unit mass evaluation index, a hydrogen consumption rate evaluation index, a comprehensive driving range evaluation index, and an average comprehensive transmission efficiency evaluation index. The energy consumption per unit mass evaluation index represents the average power consumption per unit calculated according to the vehicle mass of the target fuel cell vehicle. The hydrogen consumption rate evaluation index represents the hydrogen consumption per unit mileage of the target fuel cell vehicle. The comprehensive driving range evaluation index represents the comprehensive driving range of the target fuel cell vehicle. The average comprehensive transmission efficiency evaluation index represents the average transmission efficiency of the target fuel cell vehicle; an index standardization module 22 for performing standardization processing on the plurality of initial evaluation indexes to obtain standardized evaluation indexes; a main evaluation index analysis module 23 for performing principal component analysis on the plurality of standardized evaluation indexes to obtain the main evaluation index and the corresponding contribution rate; a target evaluation index determination module 24 for determining the target evaluation index of the target fuel cell vehicle based on the main evaluation index and the corresponding contribution rate; an evaluation result calculation module 25 for calculating the evaluation result of the target fuel cell vehicle based on the target evaluation index and the corresponding contribution rate.

[0053] An evaluation system for the cruising range and energy efficiency performance of a fuel cell vehicle provided by the present application calculates multiple initial evaluation indicators of the target fuel cell vehicle through the initial indicator calculation module 21; among them, the multiple initial evaluation indicators include the unit mass energy consumption evaluation indicator, the hydrogen consumption rate evaluation indicator, the comprehensive cruising range evaluation indicator, and the average comprehensive transmission efficiency evaluation indicator. The unit mass energy consumption evaluation indicator represents the average unit power consumption calculated according to the vehicle mass of the target fuel cell vehicle. The hydrogen consumption rate evaluation indicator represents the hydrogen consumption per unit mileage of the target fuel cell vehicle. The comprehensive cruising range evaluation indicator represents the comprehensive cruising range of the target fuel cell vehicle. The average comprehensive transmission efficiency evaluation indicator represents the average transmission efficiency of the target fuel cell vehicle. The indicator standardization module 22 performs standardization processing on the multiple initial evaluation indicators to obtain standardized evaluation indicators. The main evaluation indicator analysis module 23 performs principal component analysis on the multiple standardized evaluation indicators to obtain the main evaluation indicators and their corresponding contribution rates. The target evaluation indicator determination module 24 determines the target evaluation indicators of the target fuel cell vehicle based on the main evaluation indicators and their corresponding contribution rates. The evaluation result calculation module 25 calculates the evaluation result of the target fuel cell vehicle based on the target evaluation indicators and their corresponding contribution rates; that is, calculates multiple initial evaluation indicators of the target fuel cell vehicle, performs standardization processing, and performs principal component analysis based on the standardized evaluation indicators to obtain the main evaluation indicators and their corresponding contribution rates, determines the target evaluation indicators according to the main evaluation indicators and their corresponding contribution rates, and calculates the evaluation result based on the target evaluation indicators and their corresponding contribution rates, removing redundant features while comprehensively considering multiple evaluation indicators of the target fuel cell vehicle, thereby reducing the evaluation complexity and improving the evaluation accuracy at the same time.

[0054] In one embodiment, the above initial indicator calculation module 21 can be further configured as follows: The calculation formula for the unit mass energy consumption evaluation indicator is: ; Wherein, E m is the unit mass energy consumption, E is the total energy consumption, m is the curb weight of the target fuel cell vehicle.

[0055] In one embodiment, the above initial indicator calculation module 21 can be further configured as follows: The calculation formula for the hydrogen consumption rate evaluation indicator is: ; ; ; Wherein, is the hydrogen consumption rate, is the hydrogen consumption, is the corrected hydrogen consumption D is the driving range is the temperature correction factor of the consumption rate is the set temperature of the thermostat in the fuel cell cooling system is the fuel cell temperature is the initial ambient temperature

[0056] In one embodiment, the above initial index calculation module 21 can be further configured as follows: The calculation formula for the comprehensive driving range evaluation index is: ； ； ； ； ； Wherein, is the comprehensive driving range is the driving range contributed by the fuel cell system is the driving range contributed by the power battery is the influence factor of the driving mode, indicating the use efficiency of the target fuel cell vehicle hybrid system is the temperature correction factor of the driving range is the proportion of the energy contributed by the fuel cell system is the proportion of the energy contributed by the power system is the energy contributed by the fuel cell system is the energy contributed by the power battery D is the driving range

[0057] In one embodiment, the above initial index calculation module 21 can be further configured as follows: The calculation formula for the average comprehensive transmission efficiency evaluation index is: ; Wherein, is the average comprehensive transmission efficiency is the temperature correction factor of the efficiency is the theoretical value of the total driving energy in the cycle condition represents the increased energy in the battery after the cycle condition ends is the energy contained in the consumed hydrogen is the energy regeneratively braked and charged into the battery is the decreased energy in the battery after the cycle condition ends is the average discharge efficiency of the storage battery, is the fuel cell efficiency.

[0058] In one embodiment, the above-mentioned index standardization module 22 may be further configured to: after normalizing a plurality of initial evaluation indexes of a plurality of target fuel cell vehicles, obtain an evaluation sample matrix; wherein, the elements in the evaluation sample matrix represent the normalized initial evaluation indexes of the corresponding target fuel cell vehicles.

[0059] In one embodiment, the above-mentioned main evaluation index analysis module 23 may be further configured to: construct a covariance matrix of the evaluation sample matrix; calculate the eigenvalues of the covariance matrix; determine the main evaluation indexes and the corresponding contribution rates based on the eigenvalues of the covariance matrix.

[0060] In one embodiment, the above-mentioned target evaluation index determination module 24 may be further configured to: arrange the eigenvalues of the covariance matrix in descending order; sequentially calculate the sum of the contribution rates corresponding to the main evaluation indexes corresponding to the multiple eigenvalues to obtain a cumulative contribution rate; if the cumulative contribution rate is greater than a preset contribution rate threshold, then use the multiple main evaluation indexes corresponding to the cumulative contribution rate as the target evaluation indexes.

[0061] In one embodiment, the above-mentioned evaluation result calculation module 25 may be further configured to: perform weighted summation on the target evaluation indexes based on the contribution rates of the target evaluation indexes to obtain the evaluation result of the target fuel cell vehicle.

[0062] Next, refer to Figure 3 to describe the electronic device according to an embodiment of the present application. The electronic device may be any one or both of the first device and the second device, or a stand-alone device independent of them, and the stand-alone device may communicate with the first device and the second device to receive the input signals collected from them.

[0063] Figure 3 Illustrates a block diagram of an electronic device according to an embodiment of the present application.

[0064] As Figure 3 shown, the electronic device 10 includes one or more processors 11 and a memory 12.

[0065] The processor 11 may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 10 to perform desired functions.

[0066] The memory 12 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage media, and the processor 11 may run the program instructions to implement the methods of the various embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, etc. may also be stored in the computer-readable storage media.

[0067] In one example, the electronic device 10 may further include: an input device 13 and an output device 14, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0068] When the electronic device is a stand-alone device, the input device 13 may be a communication network connector for receiving the collected input signals from the first device and the second device.

[0069] In addition, the input device 13 may further include, for example, a keyboard, a mouse, etc.

[0070] The output device 14 may output various information to the outside, including the determined distance information, direction information, etc. The output device 14 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0071] Of course, for simplicity, Figure 3 only some of the components related to the present application in the electronic device 10 are shown, and components such as buses, input / output interfaces, etc. are omitted. In addition, according to specific application scenarios, the electronic device 10 may further include any other appropriate components.

[0072] In addition to the above methods and devices, the embodiments of the present application may also be computer program products, which include computer program instructions that, when run by a processor, cause the processor to execute the steps in the methods according to the various embodiments of the present application described in the "Exemplary Method" section of this specification.

[0073] The computer program product can be written in any combination of one or more programming languages for executing the program code of the operations of the embodiments of the present application. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, executed as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0074] In addition, an embodiment of the present application can also be a computer-readable storage medium, on which computer program instructions are stored. When the computer program instructions are run by a processor, the processor is caused to execute the steps in the methods according to various embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0075] The computer-readable storage medium can adopt any combination of one or more readable media. The readable media can be a readable signal medium or a readable storage medium. The readable storage medium can, for example, include but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0076] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purposes of illustration and easy understanding, and not for limitation. The above details do not limit the present application to necessarily adopt the above specific details for implementation.

[0077] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any way. Words such as "comprising," "including," "having," etc. are open-ended terms that mean "including but not limited to" and can be used interchangeably with each other. The word "or" and "and" used herein refer to the phrase "and / or" and can be used interchangeably with it, unless the context clearly indicates otherwise. The phrase "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with it.

[0078] It should also be noted that in the devices, equipment, and methods of this application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of this application.

[0079] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0080] The above description has been given for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle, characterized in that: include: Calculate and obtain multiple initial evaluation indicators of the target fuel cell vehicle; wherein the multiple initial evaluation indicators include a unit mass energy consumption evaluation indicator, a hydrogen consumption rate evaluation indicator, a comprehensive driving range evaluation indicator, and an average comprehensive transmission efficiency evaluation indicator, the unit mass energy consumption evaluation indicator represents the average unit power consumption of the target fuel cell vehicle calculated according to the vehicle mass, the hydrogen consumption rate evaluation indicator represents the hydrogen consumption per unit mileage of the target fuel cell vehicle, the comprehensive driving range evaluation indicator represents the comprehensive driving range of the target fuel cell vehicle, and the average comprehensive transmission efficiency evaluation indicator represents the average transmission efficiency of the target fuel cell vehicle; Standardizing the multiple initial evaluation indicators to obtain standardized evaluation indicators; Performing principal component analysis on the plurality of standardized evaluation indicators to obtain principal evaluation indicators and corresponding contribution rates; Determining a target evaluation index for the target fuel cell vehicle based on the main evaluation index and the corresponding contribution rate; Based on the target evaluation index and the corresponding contribution rate, an evaluation result of the target fuel cell vehicle is calculated.

2. The method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle according to claim 1, characterized in that: The multiple initial evaluation indicators of the target fuel cell vehicle obtained by calculation include: The calculation formula of the unit mass energy consumption evaluation index is: ； in, E m is the energy consumption per unit mass, E is the total energy consumption, m The target fuel cell vehicle's curb weight.

3. The method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle according to claim 1, characterized in that: The multiple initial evaluation indicators of the target fuel cell vehicle obtained by calculation include: The calculation formula of the hydrogen consumption rate evaluation index is: ； ； ； in, is the hydrogen consumption rate, is the hydrogen consumption, is the corrected hydrogen consumption, D For mileage, is the temperature correction factor for the consumption rate, is the set temperature of the fuel cell cooling system thermostat, is the fuel cell temperature, is the initial ambient temperature.

4. The method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle according to claim 1, characterized in that: The multiple initial evaluation indicators of the target fuel cell vehicle obtained by calculation include: The calculation formula of the comprehensive driving range evaluation index is: ； ； ； ； ； in, For comprehensive driving range, Driving history contributed to the fuel cell system, Driving history contributed to power batteries, is the driving mode influencing factor, which indicates the utilization efficiency of the hybrid system of the target fuel cell vehicle. is the temperature correction factor for driving range, Contribution to the fuel cell system energy ratio, The proportion of energy contributed to the power system, Contributing energy to the fuel cell system, Contribute energy to the power battery. D For mileage.

5. The method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle according to claim 1, characterized in that: The multiple initial evaluation indicators of the target fuel cell vehicle obtained by calculation include: The calculation formula of the average comprehensive transmission efficiency evaluation index is: ； in, is the average comprehensive transmission efficiency, is the temperature correction factor for efficiency, is the theoretical value of the total driving energy of the cycle condition, It indicates the increased energy in the battery after the cycle condition ends. is the energy contained in the consumed hydrogen, Energy charged into the battery for regenerative braking, It is the energy reduced in the battery after the cycle condition ends. is the average discharge efficiency of the battery, for fuel cell efficiency.

6. The method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle according to claim 1, characterized in that: The standardization of the multiple initial evaluation indicators to obtain the standardized evaluation indicators includes: After normalizing multiple initial evaluation indicators of multiple target fuel cell vehicles, an evaluation sample matrix is ​​obtained; wherein the elements in the evaluation sample matrix represent the normalized initial evaluation indicators of the corresponding target fuel cell vehicles.

7. The method for evaluating the driving range and energy efficiency of a fuel cell vehicle according to claim 6, characterized in that: The principal component analysis of the plurality of standardized evaluation indicators is performed to obtain the principal evaluation indicators and the corresponding contribution rates, including: Constructing a covariance matrix of the evaluation sample matrix; Calculating eigenvalues ​​of the covariance matrix; The main evaluation index and the corresponding contribution rate are determined based on the eigenvalues ​​of the covariance matrix.

8. The method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle according to claim 7, characterized in that: Determining the target evaluation index of the target fuel cell vehicle based on the main evaluation index and the corresponding contribution rate includes: Arrange the eigenvalues ​​of the covariance matrix in descending order; The sum of the contribution rates of the main evaluation indicators corresponding to the multiple eigenvalues ​​is calculated in sequence to obtain the cumulative contribution rate; If the cumulative contribution rate is greater than a preset contribution rate threshold, a plurality of main evaluation indicators corresponding to the cumulative contribution rate are used as the target evaluation indicators.

9. The method for evaluating the driving range and energy efficiency performance of a fuel cell vehicle according to claim 1, characterized in that: The evaluation result of the target fuel cell vehicle calculated based on the target evaluation index and the corresponding contribution rate includes: The target evaluation indicators are weighted and summed based on the contribution rates of the target evaluation indicators to obtain an evaluation result of the target fuel cell vehicle.

10. A fuel cell vehicle driving range and energy efficiency performance evaluation system, characterized in that: include: An initial index calculation module, used to calculate a plurality of initial evaluation indicators of a target fuel cell vehicle; wherein the plurality of initial evaluation indicators include a unit mass energy consumption evaluation indicator, a hydrogen consumption rate evaluation indicator, a comprehensive driving range evaluation indicator and an average comprehensive transmission efficiency evaluation indicator, wherein the unit mass energy consumption evaluation indicator represents the average unit power consumption of the target fuel cell vehicle calculated according to the vehicle mass, the hydrogen consumption rate evaluation indicator represents the hydrogen consumption per unit mileage of the target fuel cell vehicle, the comprehensive driving range evaluation indicator represents the comprehensive driving range of the target fuel cell vehicle, and the average comprehensive transmission efficiency evaluation indicator represents the average transmission efficiency of the target fuel cell vehicle; An indicator standardization module, used to standardize the multiple initial evaluation indicators to obtain standardized evaluation indicators; A main evaluation index analysis module is used to perform principal component analysis on the plurality of standardized evaluation indicators to obtain the main evaluation indicators and the corresponding contribution rates; A target evaluation index determination module, used to determine the target evaluation index of the target fuel cell vehicle based on the main evaluation index and the corresponding contribution rate; The evaluation result calculation module is used to calculate the evaluation result of the target fuel cell vehicle based on the target evaluation index and the corresponding contribution rate.

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