CN108110282A - Fuel battery engines Poewr control method - Google Patents
Fuel battery engines Poewr control method Download PDFInfo
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- CN108110282A CN108110282A CN201711237026.8A CN201711237026A CN108110282A CN 108110282 A CN108110282 A CN 108110282A CN 201711237026 A CN201711237026 A CN 201711237026A CN 108110282 A CN108110282 A CN 108110282A
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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
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04776—Pressure; Flow at auxiliary devices, e.g. reformer, compressor, burner
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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
- 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
- H01M8/0438—Pressure; Ambient pressure; Flow
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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
- 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
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04425—Pressure; Ambient pressure; Flow at auxiliary devices, e.g. reformers, compressors, burners
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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
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04858—Electric variables
- H01M8/04925—Power, energy, capacity or load
- H01M8/0494—Power, energy, capacity or load of fuel cell stacks
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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
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
- H01M2250/20—Fuel cells in motive systems, e.g. vehicle, ship, plane
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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
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Abstract
The invention discloses a kind of fuel battery engines Poewr control method, including：S10, fuel cell engine power response characteristic, M power interval is divided by power bracket from small to large, and wherein M is natural number；I-th of power interval is set in, unit period maximum load amplitude is Ki；I-th of power interval is set in, unit period maximum off-load amplitude is Ji；S20, when the demand power of fuel battery engines changes, by the supply strategy for identifying air mass flow needed for changed power amplitude adjusted.The present invention combines fuel battery engines own characteristic, take into full account electrochemical reaction of fuel battery mechanism, air compressor machine and pipeline lag characteristic, it is supplied in advance by the power interval, the variable load of adjusting power cycle, the control air compressor machine that divide fuel battery engines, it can be on the premise of fuel battery engines quick response be met, the generation for phenomena such as effectively avoiding owing gas improves the service life of vehicle fuel battery engine.
Description
Technical field
The present invention relates to vehicle fuel battery more particularly to a kind of fuel battery engines Poewr control methods.
Background technology
Fuel cell car is with its zero-emission, high efficiency, long the advantages that continuing a journey, it is considered to be future automobile developing direction it
One.At present, the service life is to restrict the commercialized important bottleneck of fuel cell car.
Fuel battery engines are a set of devices that electrochemical energy can be converted into electric energy with auxiliary fuel cell, include combustion
Battery pile, air supply subsystem, hydrogen supply subsystem and hydro-thermal management subsystem are expected, to maintain fuel cell electric
The reaction environments such as rational pressure, flow, temperature, humidity inside heap.Air supply subsystem passes through the components such as air compressor machine, control
Fuel cell charge flow rate, hydrogen supply subsystem do servo antrol.
Difference lies in need to carry out frequent variable load to meet vehicle operating mode need with other purposes maximum for vehicle fuel battery
It asks, and variable load operating mode, particularly influence proportion of the loading condition to fuel battery service life are larger.Therefore, it is necessary to a kind of fuel electricity
Pond engine control in the case where meeting the loading demand of automobile quick response to greatest extent, considers fuel cell
Electrochemical reaction characteristic and supply delay, extend fuel cell service life.
Fuel cell is in loading procedure, excessive since the response speed of gas can be more more slowly than electrochemical reaction rates
Coefficient, pressure, temperature, humidity, loading amplitude, loading speed, initial power etc., cease manner of breathing with fuel cell responding ability
It closes.After normal load, the factors such as water redistribution are influenced in by the aquation and film of fuel battery gas diffusion layer, and voltage has
The process that one section of undershoot to minimum point is recovered again.It is worth noting that under the conditions of smaller initial power, voltage undershoot is with recovering
Time it is relatively short, can be carried to carry out drawing by a larger margin.
At present, the fuel battery engines Poewr control method of mainstream is as follows：
A kind of air supplying method when fuel cell quickly loads in patent document 1 (CN103915637A) is provided, is adopted
Control corresponding air mass flow rate V with electric current I, characterization of the invention using electric current and non-power as fuel cell, and lead to
It crosses and controls air delivery rate using step length, fuel cell is made to ensure that fuel cell pile is anti-in the state of quick loading
That answers is normally carried out.
A kind of plus-minus for power generation system of automobile fuel cell is provided in patent document 2 (CN102522581A) and carries control
Method processed, this method include：A maximum power increment is set during loading, according to vehicle demand power and current fuel cell
The difference for loading power is compared to determine loading capacity with it, and calculates the permission that fuel cell generation prepares output
Power allows loading power according to what is calculated, adjusts corresponding fuel cell generation parameter, return complete letter after finishing
Number, loading, iterative cycles are loaded onto vehicle power and are equal to permission power, and so on, power subtracts needed for CYCLIC LOADING to vehicle
During load；Then direct off-load, off-load adjust corresponding fuel cell generation parameter after finishing.
For the power load method of patent document 1, based on electric current, non-power is characterized as fuel cell, more convenient
Air delivery rate is controlled, but does not account for supplying delay caused by air compressor machine, pipeline, pile reaction, air metering ratio fails
It accurately controls；, patent document 2 power regulating method, by according to the maximum allowable loading power of different capacity interval division, having
Effect, which reduces, owes gas risk, but plus-minus load process is not finely controlled, and variable load rate is simultaneously non-optimal.
The content of the invention
The present invention seeks to propose a kind of fuel battery engines Poewr control method, fuel cell initial power is being considered
On the basis of electrochemical reaction characteristic, air compressor operating lag and circuit design delay, Power Control is carried out, optimization is each
While the variable load rate of power interval, the possibility for owing gas is reduced, extends fuel cell service life.
The present invention solves technical problem and adopts the following technical scheme that：A kind of fuel battery engines Poewr control method,
Including：
S10, fuel cell engine power response characteristic, M work(is divided by power bracket by it from small to large
Rate section, wherein M are natural number；I-th of power interval is set in, unit period maximum load amplitude is Ki, i be less than or equal to
The natural number of M；And with the increase of i, KiIt is gradually reduced；I-th of power interval is set in, unit period maximum off-load amplitude is
Ji, and Ji≤Ji-1, wherein i is not equal to 1；
S20, when the demand power of fuel battery engines changes, by identifying air needed for changed power amplitude
The supply strategy of flow；
Wherein, S20 is：
S201, the maximum capacity according to air compressor machine response and circuit design, set the unit most short cycle, and keep pre- supply
Time is the unit most short cycle；
S202, when from initial power PaIt is loaded onto target power PbWhen, perform S203 to S206；
S203, identification initial power PaWith target power PbPlace power interval and from initial power PaTo target power
PbDuring between the power interval crossed over, and confirm in each power interval, the maximum load amplitude K in unit periodi；
And according to initial power Pa, confirm the desired value in next cycle of the power of fuel battery engines；
The corresponding air compressor machine target of desired value in next cycle of the power of S204, setting and fuel battery engines into
Tolerance；
S205, by 1 cycle, detect that the actual charge flow rate of fuel battery engines is equal to air compressor machine target inlet air
The power of fuel battery engines is loaded onto the desired value in next cycle by amount from currency；Loading amplitude is sent out for fuel cell
The permitted maximum load amplitude K of power interval where the currency of the power of motivationa, wherein Ka∈Ki；
S206, after the completion of the power adjustment of fuel battery engines, the power of fuel cell engine it is current
Value confirms the desired value in next cycle of the power of fuel battery engines；
S207, S204 and S206 are repeated, until air compressor machine target inlet air amount is Qb=f (Pb) when, keep gas supply flow
It is constant, after 1 cycle, the power of fuel battery engines is promoted to target power Pb, complete entire power loading procedure；
S208, when from initial power PaOff-load is to target power PbWhen, perform S209 to S212；
S209, identification initial power PaWith target power PbPlace power interval and from initial power PaTo target power
PbDuring between the power interval crossed over, confirm in each power interval, the maximum off-load amplitude J in unit periodi；
S210, the desired value that the power of fuel battery engines is reduced to next cycle from currency, off-load amplitude are
The permitted maximum off-load amplitude of power interval where the currency of the power of fuel battery engines；And according to off-load after
The currency of the power of fuel battery engines sets air compressor machine target inlet air amount
S211, by 1 cycle, detect that the actual charge flow rate of fuel cell is equal to air compressor machine target induction flow；Root
The desired value in next cycle of fuel battery engines is calculated according to the currency of the power of fuel battery engines；
S212, S210 and S211 are repeated, until confirming that the currency of the power of fuel battery engines reaches target
Power PaWhen, it is Q to set air compressor machine target inlet air amounta=f (Pa), complete entire power off-load process.
The present invention has the advantages that：The present invention combines fuel battery engines own characteristic, takes into full account fuel
Cell electrochemical reaction mechanism, air compressor machine and pipeline lag characteristic, by dividing the power interval of fuel battery engines, adjusting
Power cycle variable load, control air compressor machine supply in advance, can have on the premise of fuel battery engines quick response is met
The generation for phenomena such as effect avoids owing gas improves the service life of vehicle fuel battery engine.
Description of the drawings
Fig. 1 is the Periodic decomposition schematic diagram that power loads in the present invention.
Fig. 2 is the Periodic decomposition schematic diagram of power off-load in the present invention.
Specific embodiment
Technical scheme is further elaborated with reference to embodiment and attached drawing.
Embodiment 1
A kind of fuel battery engines Poewr control method is present embodiments provided, including：
S10, fuel cell engine initial power response characteristic, by it by power bracket by being divided into from small to large
M power interval, it is K to be set in i-th of power interval unit period maximum load amplitudei, i is the natural number less than or equal to M；
And with the increase of i, KiIt is gradually reduced.
It is J to be set in i-th of power interval unit period maximum off-load amplitudei, and Ji≤Ji-1, wherein i is not equal to 1.
S20, when the demand power of fuel battery engines changes, according to Qx=f (Px), institute is controlled by power P
The air supply flow rate Q needed.
In the present embodiment, the S20 is specifically：
S201, the maximum capacity according to air compressor machine response and circuit design, set the unit most short cycle, and keep pre- supply
Time is the unit most short cycle, and the actual charge flow rate of fuel battery engines is made to promote/be reduced to desired value from currency；With
Meet the condition needed for the power from currency loading/off-load to desired value of fuel battery engines.
S202, when from initial power PaIt is loaded onto target power PbWhen, perform S203 to S206；
S203, identification initial power PaWith target power PbPlace power interval and from initial power PaTo target power
PbDuring between the power interval crossed over, in each power interval for confirmation, the maximum load amplitude in unit period
Ki.And according to initial power Pa, confirm desired value (the initial power P in next cycle of the power of fuel battery enginesaIn addition
Initial power PaCorresponding maximum load amplitude)；
The corresponding air compressor machine target of desired value in next cycle of the power of S204, setting and fuel battery engines into
Tolerance.
S205, by 1 cycle, detect that the actual charge flow rate of fuel battery engines is equal to air compressor machine target inlet air
The power of fuel battery engines, is loaded onto the desired value in next cycle by amount from currency, and loading amplitude is sent out for fuel cell
The permitted maximum load amplitude K of power interval where the currency of the power of motivationa, wherein Ka∈Ki；
S206, after the completion of the power adjustment of fuel battery engines, the power of fuel cell engine it is current
Value confirms the desired value in next cycle of the power of fuel battery engines；
S207, S204 and S206 are repeated, until air compressor machine target inlet air amount is Qb=f (Pb) when, keep gas supply flow
It is constant, after 1 cycle, the power of fuel battery engines is promoted to target power Pb, complete entire power loading procedure.
S208, when from initial power PaOff-load is to target power PbWhen, perform S209 to S212；
S209, identification initial power PaWith target power PbPlace power interval and from initial power PaTo target power
PbDuring between the power interval crossed over.In each power interval for confirmation, the maximum off-load amplitude in unit period
Ji。
S210, the desired value that the power of fuel battery engines is reduced to next cycle from currency, off-load amplitude are
The permitted maximum off-load amplitude of power interval where the currency of the power of fuel battery engines；And according to off-load after
The currency of the power of fuel battery engines sets air compressor machine target inlet air amount.
S211, by 1 cycle, detect that the actual charge flow rate of fuel cell is equal to air compressor machine target induction flow；Root
Desired value (the fuel cell hair in next cycle of fuel battery engines is calculated according to the currency of the power of fuel battery engines
The currency of the power of motivation subtracts the maximum off-load amplitude corresponding to the currency of the power of fuel battery engines)；
S212, S210 and S211 are repeated, until confirming that the currency of the power of fuel battery engines reaches target
Power PaWhen, it is Q to set air compressor machine target inlet air amounta=f (Pa), complete entire power off-load process.
Embodiment 2
By taking the fuel battery engines of rated power 60kW as an example, a kind of fuel battery engines work(is present embodiments provided
Rate control method, including：
Power interval is divided into four：M1：0kW-15kW, M2：15kW-30kW, M3：30kW-45kW, M4：45kW-
60kW。
Fuel battery air metering ratio is set to 2.0.By analyzing air compressor machine supply and circuit design characteristic, pre- supply is set
Time, i.e. the unit most short cycle are 0.3s.
In each power interval, a cycle maximum power loading amplitude is respectively：K1:3kW, K2:2.5kW, K3:
1.5kW, K4:1kW.In each power interval, a cycle maximum power off-load amplitude is respectively J1:15kW, J2:15kW, J3:
5kW, J4:5kW。
Rated power is loaded onto from idling：
During fuel battery engines idling, external output power is 0kW, is placed in M at this time1Section, unit period is most greatly
Load amplitude is 3kW.
Start air compressor machine supply first, it is fuel cell P to set air compressor machine air mass flow0+1Air mass flow needed for=3kW
2.7g/s。
By 1 cycle, that is, 0.3s, detection fuel cell air inflow reaches 2.7g/s, starts the starting fluid power of battery and adds
It is loaded onto P1=3kW.Continue to increase air compressor machine gas supply flow, it is fuel cell P to set air compressor machine air mass flow1+1It is required during=6kW
Air mass flow 5.4g/s, according to said method continue to load.
By 5 cycle, that is, 1.5s, it is externally defeated can to promote fuel cell up to 14.1g/s for detection fuel cell air inflow
Go out power to P5=15kW.Continue to increase air compressor machine gas supply flow, it is fuel cell P to set air compressor machine air mass flow5+1=
Required air mass flow 16.8g/s during 17.5kW, according to said method continues to load.
By 36 cycle, that is, 10.8s, detection fuel cell air inflow reaches 65.9g/s, meet fuel cell 60kW into
Tolerance demand starts the starting fluid power of battery and is loaded onto P36=60kW completes loading of the idling to rated power.
From rated power off-load to idling：
When fuel battery engines are in rated power, externally output is 60kW, is now in M4Power interval, unit week
Phase maximum off-load amplitude is 5kW.
Fuel battery power off-load is to P1=55kW, then by air compressor machine flow from fuel cell 60kW when required air stream
65.9g/s is measured, is adjusted to air mass flow 58.5g/s required during fuel cell 55kW.
By 1 cycle, that is, 0.3s, detection fuel cell air inflow reaches 58.5g/s, continues off-load fuel battery power
To P2=50kW, then by air compressor machine flow from fuel cell 55kW when required air mass flow 58.5g/s, be adjusted to fuel cell
Required air mass flow 52.8g/s, according to said method continues off-load during 50kW.
By 7 cycle, that is, 2.1s, detection fuel cell air inflow reaches 13.7g/s, continues off-load fuel battery power
To P7=0kW, then by air compressor machine flow from fuel cell 15kW when required air mass flow 13.7g/s, be adjusted to 0g/s, complete
Rated power to idling off-load.
The sequencing of above example only for ease of description, does not represent the quality of embodiment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in foregoing embodiments or carry out equivalent substitution to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical solution spirit and
Scope.
Claims (1)
1. a kind of fuel battery engines Poewr control method, which is characterized in that including：
It, is divided into M power area by S10, fuel cell engine power response characteristic from small to large by power bracket
Between, wherein M is natural number；I-th of power interval is set in, unit period maximum load amplitude is Ki, i is less than or equal to M's
Natural number；And with the increase of i, KiIt is gradually reduced；I-th of power interval is set in, unit period maximum off-load amplitude is Ji,
And Ji≤Ji-1, wherein i is not equal to 1；
S20, when the demand power of fuel battery engines changes, by identifying air needed for changed power amplitude adjusted
The supply strategy of flow；
Wherein, S20 is：
S201, the maximum capacity according to air compressor machine response and circuit design, set the unit most short cycle, and keep pre- service life
For the unit most short cycle；
S202, when from initial power PaIt is loaded onto target power PbWhen, perform S203 to S206；
S203, identification initial power PaWith target power PbPlace power interval and from initial power PaTo target power Pb's
The power interval crossed among process, and confirm in each power interval, the maximum load amplitude K in unit periodi；And root
According to initial power Pa, confirm the desired value in next cycle of the power of fuel battery engines；
The corresponding air compressor machine target inlet air of desired value in next cycle of the power of S204, setting and fuel battery engines
Amount；
S205, by 1 cycle, detect that the actual charge flow rate of fuel battery engines is equal to air compressor machine target inlet air amount,
The power of fuel battery engines is loaded onto to the desired value in next cycle from currency；Loading amplitude is fuel battery engines
Power currency where power interval permitted maximum load amplitude Ka, wherein Ka∈Ki；
S206, after the completion of the power adjustment of fuel battery engines, the currency of the power of fuel cell engine, really
Recognize the desired value in next cycle of the power of fuel battery engines；
S207, S204 and S206 are repeated, until air compressor machine target inlet air amount is Qb=f (Pb) when, keep gas supply flow not
Become, after 1 cycle, promote the power of fuel battery engines to target power Pb, complete entire power loading procedure；
S208, when from initial power PaOff-load is to target power PbWhen, perform S209 to S212；
S209, identification initial power PaWith target power PbPlace power interval and from initial power PaTo target power Pb's
The power interval crossed among process, confirms in each power interval, the maximum off-load amplitude J in unit periodi；
S210, the desired value that the power of fuel battery engines is reduced to next cycle from currency, off-load amplitude are fuel
The permitted maximum off-load amplitude of power interval where the currency of the power of battery engine；And according to the fuel after off-load
The currency of the power of battery engine sets air compressor machine target inlet air amount
S211, by 1 cycle, detect that the actual charge flow rate of fuel cell is equal to air compressor machine target induction flow；According to combustion
Expect that the currency of the power of battery engine calculates the desired value in next cycle of fuel battery engines；
S212, S210 and S211 are repeated, until confirming that the currency of the power of fuel battery engines reaches target power Pa
When, it is Q to set air compressor machine target inlet air amounta=f (Pa), complete entire power off-load process.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110281817A (en) * | 2019-06-04 | 2019-09-27 | 一汽解放汽车有限公司 | A kind of energy control method of fuel battery engines |
| CN112072143A (en) * | 2020-09-07 | 2020-12-11 | 中国第一汽车股份有限公司 | Dynamic control method of fuel cell system |
| WO2021115110A1 (en) * | 2019-12-12 | 2021-06-17 | 长城汽车股份有限公司 | Engine control method, system, and vehicle |
| CN113497261A (en) * | 2020-04-07 | 2021-10-12 | 广州汽车集团股份有限公司 | Method and device for determining output power of fuel cell |
| CN114122465A (en) * | 2021-11-25 | 2022-03-01 | 重庆地大工业技术研究院有限公司 | Control method for correcting dynamic loading slope of fuel cell system |
| CN114454779A (en) * | 2020-11-10 | 2022-05-10 | 北京亿华通科技股份有限公司 | Asymmetric variable load slope method based on fuel cell power output |
| WO2022142382A1 (en) * | 2020-12-31 | 2022-07-07 | 宁波申江科技股份有限公司 | Control system of reformed methanol fuel cell power generation system in variable load working condition |
| CN115498213A (en) * | 2022-11-14 | 2022-12-20 | 北京亿华通科技股份有限公司 | Fuel cell thermal management system and hysteresis compensation control method thereof |
| CN116525893A (en) * | 2023-06-20 | 2023-08-01 | 广东云韬氢能科技有限公司 | Control method for prolonging service life of fuel cell system |
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