CN113314738B - Method for evaluating running health state of hydrogen fuel cell engine system - Google Patents
Method for evaluating running health state of hydrogen fuel cell engine system Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 75
- 230000036541 health Effects 0.000 title claims abstract description 66
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000001257 hydrogen Substances 0.000 title claims abstract description 46
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004891 communication Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000003862 health status Effects 0.000 claims description 7
- 230000001603 reducing effect Effects 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000012258 culturing Methods 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 51
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000001453 impedance spectrum Methods 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 206010013496 Disturbance in attention Diseases 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011234 economic evaluation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04992—Processes for controlling fuel cells or fuel cell systems characterised by the implementation of mathematical or computational algorithms, e.g. feedback control loops, fuzzy logic, neural networks or artificial intelligence
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses an evaluation method of the running health state of a hydrogen fuel cell engine system, which comprises the steps of firstly capturing performance data of the hydrogen fuel cell stack engine system in a certain period: pile start-up and shutdown frequency f 1 Pile load-changing frequency f 2 Duty cycle f of unhealthy power interval 3 System lift-load rate f 4 The method comprises the steps of carrying out a first treatment on the surface of the Setting a limiting extremum f of system performance data m1 ～f m4 The method comprises the steps of carrying out a first treatment on the surface of the Setting an influence factor K of various performances of the system on the service life of the system 1 ～K 4 The method comprises the steps of carrying out a first treatment on the surface of the Calculating a hydrogen fuel cell engine system operation state of health index value l=k based on the performance data and the set limit value and the influence factor 1 ×f 1 /f m1 +K 2 ×f 2 /f m2 +K 3 ×f 3 /f m3 +K 4 ×f 4 /f m4 The method comprises the steps of carrying out a first treatment on the surface of the And finishing reminding operation according to the calculated running health state index value L of the hydrogen fuel cell engine system. The invention quantitatively expresses the health state of the fuel cell system, gives rapid positive feedback from the system level, can efficiently and rapidly improve the system control and the running state, and is beneficial to prolonging the service life of the system and culturing the healthy driving habit of a driver.
Description
Technical Field
The invention relates to the field of hydrogen fuel cells, in particular to a method for evaluating the running health state of an engine system of a hydrogen fuel cell.
Background
The hydrogen fuel cell is a device which uses hydrogen and oxygen/air as reaction gases, uses catalytic chemical reaction to reduce the energy barrier of oxygen reduction reaction, and makes the reaction generate electrons so as to form current and provide electric energy for a load. The device utilizes the thermal cycle of separating from the Carnot, has very high thermoelectric conversion efficiency, only generates water with zero pollution to the environment, and has absolute environmental friendliness. It has been widely used in portable power sources, fixed power sources/stations, road traffic, marine and military applications. Hydrogen fuel cell powered vehicles are also used as energy consuming vehicles, and the economic evaluation of which is greatly affected by energy consumption data, i.e. the level of energy consumption directly affects the running cost of the vehicle.
Depending on the hydrogen fuel cell engine system power performance, the power system may be designed as a full power following mode power system and an electro-electric hybrid system. In the former system, a fuel cell engine is used as a main power source of a vehicle to output, and a small-capacity power battery plays a role in peak clipping and valley filling in coordination with the requirements of the vehicle; the power response and the lifting load rate of the hydrogen fuel cell engine system are influenced by the design of the system, so that the power demand of the vehicle is difficult to meet, and the peak clipping and valley reducing effects in a large range can be achieved by configuring a power cell with large capacity or energy.
The service life of the engine system is influenced by the configuration of the power system, working conditions, driving habits, energy control strategies of the whole vehicle and the like. How to quantify these influencing factors to represent the running health status of the vehicle/engine system, to guide the system supply plant, the whole vehicle plant, and even the driver to adjust the related strategy and driving habit, can effectively improve the service life of the whole vehicle and the hydrogen fuel cell engine.
Patent document 2 (patent number: CN 201910410065.6) discloses a method, a system and a device for detecting the online life of a fuel cell of a new energy automobile, which specifically include the following steps: collecting the battery temperature, the battery hydrogen parameter, the battery air parameter, the current value and the voltage value of the fuel battery at the current moment in real time; calculating ideal open-circuit electromotive force at the current moment according to the battery temperature, the battery hydrogen parameter and the battery air parameter; calculating and obtaining concentration loss electromotive force and polarization loss electromotive force according to the current value, the voltage value and the ideal open-circuit electromotive force; and calculating the current direct current internal resistance of the fuel cell according to the concentration loss electromotive force and the polarization loss electromotive force and obtaining the health state index of the fuel cell.
Patent document 2 (patent number: CN 201811493110.0) discloses a method for analyzing the state of health of a proton exchange membrane fuel cell stack, comprising the steps of: testing the output performance and impedance spectrum of the proton exchange membrane fuel cell stack by using a fuel cell test platform and an EIS test platform; fitting an impedance spectrum experimental curve obtained through impedance spectrum testing to an equivalent circuit of the proton exchange membrane fuel cell, and obtaining an impedance spectrum fitting curve of the proton exchange membrane fuel cell from the equivalent circuit by using fitting software; and obtaining the running state of the proton exchange membrane fuel cell stack by combining the output performance of the fuel cell stack through an experimental curve and a fitting curve of the impedance spectrum.
The two patent documents all reflect the health state of the fuel cell by testing the performances of current, voltage, electrochemical impedance spectrum and the like of the fuel cell body, have low feedback speed and cannot efficiently and rapidly improve the control and the running state of the system.
Disclosure of Invention
The invention aims at: the method for evaluating the running health state of the hydrogen fuel cell engine system quantitatively expresses the health state of the system, gives rapid positive feedback from the system level, improves the system control and the running state efficiently and rapidly, prolongs the service life of the system and cultures the healthy driving habit of a driver.
The technical scheme of the invention is as follows:
a method of assessing the operational health of a hydrogen fuel cell engine system, comprising:
s1, firstly, capturing performance data of a hydrogen fuel cell stack engine system in a certain period: electric powerFrequency f of stack start-up and shutdown 1 Pile load-changing frequency f 2 Duty cycle f of unhealthy power interval 3 System lift-load rate f 4 ；
Setting the maximum allowable frequency f of startup and shutdown of a galvanic pile m1 Maximum load-changing frequency f allowed by galvanic pile m2 Highest duty ratio f of unhealthy power intervals of galvanic pile m3 Highest system lifting load rate f m4 ；
Setting an influence factor K of startup and shutdown of a galvanic pile on service life of a system 1 Factor K of influence of pile load-changing frequency on service life of system 2 Factor K of influence of unhealthy power intervals of galvanic pile on system life 3 Factor K of influence of system lifting load rate on system service life 4 ；
S2, calculating an operation health state index value L of the hydrogen fuel cell engine system according to the performance data grasped in the S1 and the set limit value and the set influence factor:
L＝K 1 ×F 1 +K 2 ×F 2 +K 3 ×F 3 +K 4 ×F 4 ；
wherein: f (F) 1 ＝f 1 /f m1 ,F 2 ＝f 2 /f m2 ,F 3 ＝f 3 /f m3 ,F 4 ＝f 4 /f m4 ；
S3, according to the calculated running health state index value L of the hydrogen fuel cell engine system in the S2, completing reminding operation:
s3-1, if L is more than or equal to 1, stopping the system operation, prompting serious health faults and checking the system;
s3-2, if L epsilon (0, 1), judging F 1 ～F 4 If there is a case of greater than 1:
s3-2-1, if F 1 ～F 4 If the number is more than 1, prompting the corresponding health state;
s3-2-2, if F 1 ～F 4 And if the running states are smaller than 1, the running states of the system are healthy.
Preferably, in step S3-2-2, the value of L and the set system health state index value recommendation are also determinedValue a 0 Is of the size of (2):
if L is more than or equal to 0 and less than a 0 Prompting the health of the running state of the system;
if a is 0 L is less than or equal to 1, and no prompt is made.
Preferably, in step S1, a fuel cell vehicle controller (FCU) is used to capture performance data of the hydrogen fuel cell stack engine system and transmit the performance data to a Vehicle Control Unit (VCU); the whole Vehicle Controller (VCU) calculates the running health state index value L of the hydrogen fuel cell engine system in the steps S2 and S3 and judges the health state.
Preferably, in step S3-2-1, if F 1 ～F 4 And greater than 1, wherein:
if F 1 >1, indicating that the start-up and stop frequency of a pile is over-limit, and reporting a request for reducing the stop time to an instrument by a Vehicle Control Unit (VCU) through a communication system;
if F 2 >1, indicating that the load-changing frequency of a galvanic pile is over-limited, and reporting a 'please stably drive' to an instrument by a Vehicle Control Unit (VCU) through a communication system;
if F 3 >1, indicating that the duty ratio of an unhealthy power interval exceeds the limit, and reporting an energy control imbalance alarm by a Vehicle Control Unit (VCU) through TBOX;
if F 4 >1, the system load lifting rate exceeds the limit, the whole Vehicle Controller (VCU) sends the fault and data to the fuel cell vehicle controller (FCU) through a communication system, and the fuel cell vehicle controller (FCU) reports the frequency rate exceeding alarm through TBOX.
Preferably, said F 1 ～F 4 F under the condition of not exceeding the limit value of the health index 1 ～F 4 Outputting as a calculated value; under the condition of exceeding the limit value of health index, F 1 ～F 4 The output is 1.
Preferably, the cycle of the fuel cell vehicle controller (FCU) capturing the performance data of the hydrogen fuel cell stack engine system and the cycle of the whole Vehicle Controller (VCU) for calculating L and judging the health state is the same cycle T0.
Preferably, the fuel cell vehicle controller (FCU) or the whole Vehicle Controller (VCU) stores the health status reminding and fault alarming information of the system, and in the next time period T1, the storage mechanism automatically eliminates the health status reminding and fault alarming information of the previous period T0, and the health status reminding and fault alarming information is kept in cloud data and is maintained as data information.
The invention has the advantages that:
1. according to the assessment method for the running health state of the hydrogen fuel cell engine system, the health state of the fuel cell system is quantitatively expressed, and the rapid positive feedback is given from the system level, so that the system control and the running state can be improved efficiently and rapidly, the service life of the system is prolonged, and the healthy driving habit of a driver is cultivated.
2. According to the invention, the health state of the fuel cell engine system is judged through a specific algorithm according to the actual running condition of the system, improvement measures are provided, and related information is transmitted through an instrument, a communication system or a T-Box, so that a provider or a driver can properly adjust products, control strategies or driving habits, and the service life of the system is prolonged.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
FIG. 1 is a flow chart of an assessment of the operating health of a hydrogen fuel cell engine system;
FIG. 2 is a data interaction schematic diagram of an assessment of the operating state of health of a hydrogen fuel cell engine system.
Detailed Description
As shown in fig. 1 and 2, the method for evaluating the operation health status of a hydrogen fuel cell engine system according to the present invention includes:
s1, firstly, capturing performance data of a hydrogen fuel cell stack engine system in a certain period by adopting a fuel cell automobile controller (FCU): pile start-up and shutdown frequency f 1 Pile load-changing frequency f 2 Duty cycle f of unhealthy power interval 3 System lift-load rate f 4 The method comprises the steps of carrying out a first treatment on the surface of the And transmitted to a Vehicle Control Unit (VCU);
setting the maximum allowable frequency f of startup and shutdown of a galvanic pile m1 Maximum load-changing frequency f allowed by galvanic pile m2 Unhealthy galvanic pileMaximum duty cycle f of power interval m3 Highest system lifting load rate f m4 The method comprises the steps of carrying out a first treatment on the surface of the Each health index limit value can be locked according to the characteristics of the related products;
setting an influence factor K of startup and shutdown of a galvanic pile on service life of a system 1 Factor K of influence of pile load-changing frequency on service life of system 2 Factor K of influence of unhealthy power intervals of galvanic pile on system life 3 Factor K of influence of system lifting load rate on system service life 4 And each influence factor is adjusted according to the characteristics of the product.
The system state parameters affecting the system health may include, in addition to the above-mentioned 4 categories, a plurality of conditions affecting the lifetime, such as the number of cold starts at low temperature, the idle time duty ratio of the fuel cell system, etc., or may be reduced on the original basis.
S2, a Vehicle Controller (VCU) calculates an operation health state index value L of the hydrogen fuel cell engine system according to the performance data captured in the S1 and the set limit value and the set influence factor:
L＝K 1 ×F 1 +K 2 ×F 2 +K 3 ×F 3 +K 4 ×F 4 ；
wherein: f (F) 1 ＝f 1 /f m1 ,F 2 ＝f 2 /f m2 ,F 3 ＝f 3 /f m3 ,F 4 ＝f 4 /f m4 ；
S3, according to the calculated running health state index value L of the hydrogen fuel cell engine system in the S2, completing reminding operation:
s3-1, if L is more than or equal to 1, stopping the system operation, prompting serious health faults and checking the system;
s3-2, if L epsilon (0, 1), judging F 1 ～F 4 If there is a case of greater than 1:
s3-2-1, if F 1 ～F 4 If the number is more than 1, prompting the corresponding health state; wherein:
if F 1 >1, indicating that the startup and shutdown frequency of a galvanic pile is over-limit, and reporting a request for reducing the shutdown time to a meter by a Vehicle Control Unit (VCU) through a communication system"m";
if F 2 >1, indicating that the load-changing frequency of a galvanic pile is over-limited, and reporting a 'please stably drive' to an instrument by a Vehicle Control Unit (VCU) through a communication system;
if F 3 >1, indicating that the duty ratio of an unhealthy power interval exceeds the limit, and reporting an energy control imbalance alarm by a Vehicle Control Unit (VCU) through TBOX;
if F 4 >1, the system load lifting rate exceeds the limit, the whole Vehicle Controller (VCU) sends the fault and data to the fuel cell vehicle controller (FCU) through a communication system, and the fuel cell vehicle controller (FCU) reports the frequency rate exceeding alarm through TBOX.
S3-2-2, if F 1 ～F 4 If the values are smaller than 1, the running state of the system is healthy, and then the value of L and the set recommended value a of the system health state index value are judged 0 Is of the size of (2):
if L is more than or equal to 0 and less than a 0 Prompting the health of the running state of the system;
if a is 0 L is less than or equal to 1, and no prompt is made;
there may be different systems for the system running health index recommendation value a 0.
The F is 1 ～F 4 F under the condition of not exceeding the limit value of the health index 1 ～F 4 Outputting as a calculated value; under the condition of exceeding the limit value of health index, F 1 ～F 4 The output is 1.
The fuel cell automobile controller (FCU) captures performance data of the hydrogen fuel cell stack engine system and the period of L calculation and health state judgment by the whole Vehicle Controller (VCU) is the same period T0. The fuel cell automobile controller (FCU) or the whole automobile controller (VCU) stores the health state reminding and fault alarming information of the system, and in the next time period T1, the storage mechanism automatically eliminates the health state reminding and fault alarming information of the last period T0, and the health state reminding and fault alarming information is kept in cloud data and is maintained as data information.
The fault alarm and health index in the FCU and VCU can be automatically eliminated, and can be stored offline; similarly, cloud data can be erased or retained.
Calculating and storing a time period T0, which can be adjusted according to the situation; the recommended evaluation is based on the cumulative data over the day, calculated once per hour, and the latest results are displayed. The first day fault alarm is stored in the VCU or FCU storage mechanism, the fault or alarm in the second day storage mechanism is automatically eliminated, but the fault and alarm in the cloud data cannot disappear and are maintained as data information.
In particular, the following possible specific technical embodiments are exemplified.
Example 1
The hydrogen fuel cell engine system life-affecting factors include: weighting factor K for influence on service life of system due to overlarge power interval, overlarge lifting load rate and overlarge power interval of unhealthy target of stack start-stop times, variable load overtime times and overlarge lifting load rate 1 ＝K 2 ＝K 3 ＝K 4 ＝0.25，a 0 Definition of 0.5.
The indexes of the specific influencing factors comprise: the number of times of starting and stopping the galvanic pile is not more than 3 times/day; the frequency conversion rate of the pile is not less than 6 times/h frequency conversion interval; the unhealthy power interval is not higher than 5%; the lifting load rate is not more than 1.0kW/s,
the actual data are as follows: the number of start and stop times of the electric pile is 5 times/day, the minimum frequency conversion rate of the electric pile is 4 times/h, the non-healthy power interval accounts for 7 percent, and the lifting load rate is 1.2kW/s.
The system operation health index calculation formula becomes:
L＝0.25×5/3+0.25×4/6+0.25×7/5+0.25×1.2/1.0＝1.233
the VCU sends an emergency closing instruction and the concurrent instrument reminds that the electric pile is closed due to abnormal health state, please check "
The data acquisition and calculation time period is 30min, the T1 result replaces the T0 result, and all fault records are permanently stored in the Tbox.
Example 2
The system lifetime influencing factors include: weighting factor K for influence on service life of system due to over-high load-lifting speed, over-high power interval of unhealthy target and over-high power interval of stack start-stop times, variable load over-frequency times and variable load over-frequency times 1 ＝0.3，K 2 ＝0.2，K 3 ＝0.48，K 4 ＝0.02。
The indexes of the specific influencing factors comprise: the number of times of starting and stopping the electric pile is not more than 5 times per day, the frequency conversion rate of the electric pile is not less than 10 times per hour of frequency conversion interval, the non-healthy power interval is not more than 5 percent, and the lifting load rate is not more than 3.0kW/s.
The actual data are as follows: the number of start and stop times of the electric pile is 4 times/day, the minimum frequency conversion rate of the electric pile is 4 times/h, the non-healthy power interval accounts for 3 percent, and the lifting load rate is 6.0kW/s.
The system operation health index calculation formula becomes:
L＝0.30×4/5+0.20×4/10+0.48×3/5+0.02×6.0/3.0＝0.648
the VCU sends a fault code to the FCU and the meter reminds "please drive smoothly". The data acquisition and calculation time period was 60min, T1 results replaced T0 results, and all fault records were kept in Tbox for 3 months.
Example 3
The system lifetime influencing factors include: the number of startup and shutdown of a pile, the number of variable load overtime and the lifting load rate are too high, the weighting factors of influence on the service life of a system are K1=0.4, K2=0.2, K3=0.2, a 0 Definition 0.4.
The indexes of the specific influencing factors comprise: the number of times of starting and stopping the galvanic pile is not more than 8 times per day; the frequency conversion rate of the pile is not less than 15 times/h frequency conversion interval; the lifting load rate is not more than 3.0kW/s.
The actual data are as follows: the number of startup and shutdown times of the pile is 2 times/day, the minimum frequency conversion rate of the pile is 2 times/h, and the lifting load rate is 2.0kW/s.
The system operation health index calculation formula becomes:
L＝0.40×2/8+0.20×2/15+0.20×2.0/3.0＝0.26
0.26 < a0 (0.4), the VCU sends a meter alert "healthy driving status".
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same according to the content of the present invention, and are not intended to limit the scope of the present invention. All modifications made according to the spirit of the main technical proposal of the invention should be covered in the protection scope of the invention.
Claims (7)
1. A method of assessing the operational health of a hydrogen fuel cell engine system, comprising:
s1, firstly, capturing performance data of a hydrogen fuel cell stack engine system in a certain period: pile start-up and shutdown frequency f 1 Pile load-changing frequency f 2 Duty cycle f of unhealthy power interval 3 System lift-load rate f 4 ；
Setting the maximum allowable frequency f of startup and shutdown of a galvanic pile m1 Maximum load-changing frequency f allowed by galvanic pile m2 Highest duty ratio f of unhealthy power intervals of galvanic pile m3 Highest system lifting load rate f m4 ；
Setting an influence factor K of startup and shutdown of a galvanic pile on service life of a system 1 Factor K of influence of pile load-changing frequency on system life 2 Factor K of influence of unhealthy power intervals of galvanic pile on service life of system 3 Factor K of influence of system lifting load rate on system life 4 ；
S2, calculating an operation health state index value L of the hydrogen fuel cell engine system according to the performance data grasped in the S1 and the set limit value and the set influence factor:
L＝K 1 ×F 1 +K 2 ×F 2 +K 3 ×F 3 +K 4 ×F 4 ；
wherein: f (F) 1 ＝f 1 /f m1 ,F 2 ＝f 2 /f m2 ,F 3 ＝f 3 /f m3 ,F 4 ＝f 4 /f m4 ；
S3, according to the calculated running health state index value L of the hydrogen fuel cell engine system in the S2, completing reminding operation:
s3-1, if L is more than or equal to 1, stopping the system operation, prompting serious health faults and checking the system;
s3-2, if L epsilon (0, 1), judging F 1 ～F 4 If there is a case of greater than 1:
s3-2-1, if F 1 ～F 4 If the number is more than 1, prompting the corresponding health state;
s3-2-2, if F 1 ～F 4 And if the running states are smaller than 1, the running states of the system are healthy.
2. The method for evaluating the running state of health of a hydrogen fuel cell engine system according to claim 1, wherein in step S3-2-2, the value of L and the set system health index value recommended value a are also determined 0 Is of the size of (2):
if L is more than or equal to 0 and less than a 0 Prompting the health of the running state of the system;
if a is 0 L is less than or equal to 1, and no prompt is made.
3. The method for evaluating an operating health of a hydrogen fuel cell engine system according to claim 2, wherein in step S1, a fuel cell vehicle controller (FCU) is used to capture performance data of the hydrogen fuel cell stack engine system and transmit the data to a Vehicle Control Unit (VCU); the whole Vehicle Controller (VCU) calculates the running health state index value L of the hydrogen fuel cell engine system in the steps S2 and S3 and judges the health state.
4. The method for evaluating the operating health of a hydrogen fuel cell engine system according to claim 2, wherein, in step S3-2-1, if F 1 ～F 4 And greater than 1, wherein:
if F 1 >1, indicating that the start-up and stop frequency of a pile is over-limit, and reporting a request for reducing the stop time to an instrument by a Vehicle Control Unit (VCU) through a communication system;
if F 2 >1, indicating that the load-changing frequency of a galvanic pile is over-limited, and reporting a 'please stably drive' to an instrument by a Vehicle Control Unit (VCU) through a communication system;
if F 3 >1, indicating that the duty ratio of an unhealthy power interval exceeds the limit, and reporting an energy control imbalance alarm by a Vehicle Control Unit (VCU) through TBOX;
if F 4 >1, the system load lifting rate exceeds the limit, and a Vehicle Control Unit (VCU) passes throughThe communication system sends the fault and data to a fuel cell vehicle controller (FCU) which signals a variable rate out-of-standard alarm via TBOX.
5. The method for estimating an operating state of a hydrogen fuel cell engine system according to claim 4, wherein said F 1 ～F 4 F under the condition of not exceeding the limit value of the health index 1 ～F 4 Outputting as a calculated value; under the condition of exceeding the limit value of health index, F 1 ～F 4 The output is 1.
6. The method for evaluating the operation health status of a hydrogen fuel cell engine system according to claim 3, wherein the cycle of the fuel cell vehicle controller (FCU) grasping the performance data of the hydrogen fuel cell stack engine system and the cycle of the overall Vehicle Controller (VCU) performing the calculation of L and the judgment of the health status are the same cycle T0.
7. The method for evaluating the operating health of a hydrogen fuel cell engine system according to claim 6, wherein the fuel cell vehicle controller (FCU) or the whole Vehicle Controller (VCU) stores the health alert and fault alarm information of the system, and the storage means automatically eliminates the health alert and fault alarm information of the last period T0 during the next time period T1, and continuously remains in the cloud data and is maintained as the data information.
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