CN115224308B - Fuel cell hydrogen loop pressure control method, fuel cell hydrogen loop pressure control device, vehicle and storage medium - Google Patents
Fuel cell hydrogen loop pressure control method, fuel cell hydrogen loop pressure control device, vehicle and storage medium Download PDFInfo
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- CN115224308B CN115224308B CN202110607461.5A CN202110607461A CN115224308B CN 115224308 B CN115224308 B CN 115224308B CN 202110607461 A CN202110607461 A CN 202110607461A CN 115224308 B CN115224308 B CN 115224308B
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 287
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 287
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 132
- 239000000446 fuel Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 50
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 150
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 230000015654 memory Effects 0.000 claims description 48
- 238000004590 computer program Methods 0.000 claims description 13
- 239000000110 cooling liquid Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 12
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000001360 synchronised effect Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 230000005291 magnetic effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 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
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
- B60L58/32—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for controlling the temperature of fuel cells, e.g. by controlling the electric load
- B60L58/33—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells for controlling the temperature of fuel cells, e.g. by controlling the electric load by cooling
-
- 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
- H01M8/04753—Pressure; Flow of fuel cell reactants
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses a fuel cell hydrogen loop pressure control method, a device, a vehicle and a storage medium, wherein the fuel cell hydrogen loop pressure control method comprises the following steps: determining a period and/or an opening duration of hydrogen discharge and water discharge according to the current system power request; when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, the opening moments of the hydrogen discharge valve and the drain valve are staggered on the basis of keeping the period and/or the opening duration of the hydrogen discharge valve and the drain valve unchanged. According to the fuel cell hydrogen loop pressure control method, the fuel cell hydrogen loop pressure control device, the vehicle and the storage medium, the hydrogen discharge valve and the drain valve are staggered to be opened on the basis of keeping the period and the opening time of the hydrogen discharge valve and the drain valve unchanged by coupling the period and the opening time of the hydrogen discharge valve and the drain valve, so that the stability of the hydrogen loop pressure is improved, the stable output of system power is ensured, and the service life of a galvanic pile is prolonged.
Description
Technical Field
The present invention relates to the technical field of fuel cells, and in particular, to a method and apparatus for controlling pressure of a hydrogen loop of a fuel cell, a vehicle, and a storage medium.
Background
The fuel cell is a device for directly converting chemical energy of fuel into electric energy, also called electrochemical generator, and has the advantages of high generating efficiency, less environmental pollution and the like, and has wide application prospect.
In the related art, the pressure control of the hydrogen loop of the fuel cell is generally realized through a hydrogen injection valve, a hydrogen discharge valve and a drain valve, but when the hydrogen discharge valve and the drain valve are opened, the hydrogen pressure can be greatly fluctuated, so that the fuel supply is unstable, the performance of a fuel cell stack is affected, and high-power stable output cannot be realized. In addition, liquid water is generated after the anode and cathode of the fuel cell react, and the liquid water is accumulated to cause local flooding, so that the power cannot be output normally.
In order to avoid flooding failure caused by accumulation of liquid water, the liquid water and the reacted waste gas need to be discharged in time, and a water vapor separator needs to be used for separating water from vapor of fuel cell stack output, wherein one of important factors influencing hydrogen pressure is the performance of the water vapor separator.
Because the water-vapor separator can not completely separate hydrogen and water vapor, the liquid sealing at the bottom of the water-vapor separator is extremely difficult to realize, a large amount of calibration data and accurate water quantity calculation are needed, when the drain valve of most fuel cell systems is opened, partial gas is brought out except the liquid water generated by the reaction in the electric pile, the pressure instantaneous drop is excessively large when the hydrogen discharging valve and the drain valve are simultaneously opened, the regulation range of the PID regulator is exceeded, the instantaneous fluctuation of the working pressure of the hydrogen is caused, the fluctuation of the output voltage of the electric pile of the fuel cell is caused, the pressure type faults are extremely easy to trigger, the stability of the output power of the electric pile of the fuel cell is not facilitated, and the service life of the electric pile is even reduced.
Disclosure of Invention
The invention aims to provide a fuel cell hydrogen loop pressure control method, a fuel cell hydrogen loop pressure control device, a fuel cell hydrogen loop pressure control vehicle and a fuel cell storage medium, so that the stability of the hydrogen loop pressure is improved, the stable output of system power is ensured, and the service life of a galvanic pile is prolonged.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a method for controlling a hydrogen loop pressure of a fuel cell, including:
determining a period and/or an opening duration of hydrogen discharge and water discharge according to the current system power request;
when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, the opening moments of the hydrogen discharge valve and the drain valve are staggered on the basis of keeping the period and/or the opening duration of the hydrogen discharge valve and the drain valve unchanged.
As one embodiment, when the hydrogen discharge valve opening command and the drain valve opening command are detected at the same time, the opening time of the hydrogen discharge valve and the drain valve is staggered on the basis of keeping the period and/or the opening time of the hydrogen discharge valve and the drain valve unchanged, and the method includes:
when the drain valve opening command is detected, if the current hydrogen discharge valve is in an opening state, controlling the drain valve to keep a closing state, and counting the delay time of the drain valve through a drain valve counter;
when a hydrogen discharge valve closing command is detected, closing the hydrogen discharge valve and stopping counting by the drain valve counter;
and opening the drain valve, and counting down the drain valve counter until the drain valve counter is reset to zero.
As one embodiment, when the hydrogen discharge valve opening command and the drain valve opening command are detected at the same time, on the basis of keeping the period and/or the opening duration of the hydrogen discharge and the drain water unchanged, the method further includes:
when the command for opening the hydrogen discharge valve is detected, if the current drain valve is in an open state, controlling the hydrogen discharge valve to keep a closed state, and counting the delay time of the hydrogen discharge valve through a hydrogen discharge valve counter;
closing the drain valve and stopping counting by the hydrogen discharge valve counter when a drain valve closing command is detected;
and opening the hydrogen discharge valve, and counting down the hydrogen discharge valve counter until the hydrogen discharge valve counter is reset to zero.
As one embodiment, the method further comprises:
determining a basic hydrogen spraying amount according to the current system power request;
and adjusting the given value of the hydrogen spraying amount according to the difference value of the basic hydrogen spraying amount and the actual hydrogen spraying amount.
As one embodiment, the method further comprises:
acquiring the temperature of cooling liquid of a galvanic pile;
acquiring a hydrogen pressure correction factor according to the temperature of the cooling liquid of the electric pile;
and performing primary hydrogen pressure compensation according to the hydrogen pressure correction factor.
As one embodiment, the method further comprises:
acquiring the opening state of a hydrogen discharge valve;
and performing secondary hydrogen pressure compensation according to the opening state of the hydrogen discharge valve.
As one embodiment, the performing hydrogen pressure secondary compensation according to the opening state of the hydrogen discharge valve includes:
when the hydrogen discharge valve is in an open state, performing secondary compensation on the hydrogen pressure; or alternatively
And when the hydrogen discharge valve is in a closed state, closing the hydrogen pressure secondary compensation.
In a second aspect, an embodiment of the present invention provides a fuel cell hydrogen circuit pressure control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the steps of the fuel cell hydrogen circuit pressure control method according to the first aspect.
In a third aspect, an embodiment of the present invention provides a vehicle including the fuel cell hydrogen circuit pressure control device according to the second aspect.
In a fourth aspect, embodiments of the present invention provide a computer storage medium having a computer program stored therein, which when executed by a processor, implements the steps of the fuel cell hydrogen circuit pressure control method according to the first aspect.
The embodiment of the invention provides a fuel cell hydrogen loop pressure control method, a device, a vehicle and a storage medium, wherein the fuel cell hydrogen loop pressure control method comprises the following steps: determining a period and/or an opening duration of hydrogen discharge and water discharge according to the current system power request; when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, the opening moments of the hydrogen discharge valve and the drain valve are staggered on the basis of keeping the period and/or the opening duration of the hydrogen discharge valve and the drain valve unchanged. Therefore, the hydrogen discharge valve and the drain valve are staggered to be opened on the basis of keeping the period and the opening time of the hydrogen discharge valve and the drain valve unchanged by coupling the period and the opening time of the hydrogen discharge valve and the drain valve, so that the stability of the pressure of a hydrogen loop is improved, the stable output of system power is ensured, and the service life of a galvanic pile is prolonged.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling the pressure of a hydrogen loop of a fuel cell according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for controlling the pressure of a hydrogen loop of a fuel cell according to an embodiment of the present invention;
FIG. 3 is a logic diagram of pressure feedforward compensation control of a fuel cell hydrogen circuit pressure control method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a fuel cell hydrogen circuit pressure control device according to an embodiment of the present invention.
Detailed Description
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the element defined by the phrase "comprising one … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element, and furthermore, elements having the same name in different embodiments of the invention may have the same meaning or may have different meanings, the particular meaning of which is to be determined by its interpretation in this particular embodiment or by further combining the context of this particular embodiment.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, components, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
It should be understood that, although the steps in the flowcharts in the embodiments of the present invention are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.
It should be noted that, in this document, step numbers such as S101 and S102 are adopted, and the purpose of the present invention is to more clearly and briefly describe the corresponding content, and not to constitute a substantial limitation on the sequence, and those skilled in the art may execute S102 before executing S101 in the implementation, which are all within the scope of the present invention.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a fuel cell hydrogen loop pressure control method provided by an embodiment of the present invention may be implemented by a fuel cell hydrogen loop pressure control device provided by an embodiment of the present invention, where the fuel cell hydrogen loop pressure control device may be implemented in a software and/or hardware manner, and the fuel cell hydrogen loop pressure control method includes the following steps:
step S101: determining a period and/or an opening duration of hydrogen discharge and water discharge according to the current system power request;
specifically, the determining the period and/or the opening duration of the hydrogen discharging valve and the water discharging valve according to the current system power request size may refer to separately calculating the period and/or the opening duration of the hydrogen discharging valve and the water discharging valve based on parameters such as current, pressure, temperature and the like when the fuel cell system enters the working state.
Step S102: when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, the opening moments of the hydrogen discharge valve and the drain valve are staggered on the basis of keeping the period and/or the opening duration of the hydrogen discharge valve and the drain valve unchanged.
Specifically, when the fuel cell system enters a working state, a hydrogen discharge valve opening command and a drain valve opening command are detected, and when the hydrogen discharge valve opening command and the drain valve opening command are detected at the same time, the opening moments of the hydrogen discharge valve and the drain valve are staggered on the basis of keeping the period and/or the opening duration of the hydrogen discharge and the water discharge unchanged.
In summary, in the method for controlling the pressure of the hydrogen loop of the fuel cell provided in the foregoing embodiment, the period and/or the opening duration of the hydrogen discharge valve and the drain valve are first determined according to the current system power request, and then when the hydrogen discharge valve opening command and the drain valve opening command are detected at the same time, the opening moments of the hydrogen discharge valve and the drain valve are staggered on the basis of keeping the period and/or the opening duration of the hydrogen discharge valve and the drain valve unchanged. The hydrogen discharge valve and the drain valve are staggered to be opened on the basis of keeping the period and the opening time of the hydrogen discharge valve and the drain valve unchanged by coupling the period and the opening time of the hydrogen discharge valve and the drain valve, so that the stability of the pressure of a hydrogen loop is improved, the stable output of system power is ensured, and the service life of a galvanic pile is prolonged.
In an embodiment, when the hydrogen discharge valve opening command and the drain valve opening command are detected at the same time, on the basis of keeping the period and/or the opening duration of the hydrogen discharge and the drain water unchanged, the step of staggering the opening moments of the hydrogen discharge valve and the drain valve includes:
when the drain valve opening command is detected, if the current hydrogen discharge valve is in an opening state, controlling the drain valve to keep a closing state, and counting the delay time of the drain valve through a drain valve counter;
when a hydrogen discharge valve closing command is detected, closing the hydrogen discharge valve and stopping counting by the drain valve counter;
and opening the drain valve, and counting down the drain valve counter until the drain valve counter is reset to zero.
Specifically, a hydrogen discharge valve request command req_purg and a drain valve request command req_wtr are detected; when the hydrogen discharge valve opening command req_purg=1 is detected, and then the drain valve opening command req_wtr=1 is detected, only the hydrogen discharge valve is opened, at the moment, the drain valve is controlled to keep a closed state, and meanwhile, the drain valve counter Nwtr starts to count the delay time of the drain valve; when the hydrogen discharge valve closing command req_purg=0 is detected, the hydrogen discharge valve is closed, the counting of the drain valve counter Nwtr is stopped, the drain valve is started at the moment, meanwhile, the drain valve counter Nwtr starts counting down the delay time of the drain valve, the drain valve is closed after the drain valve counter Nwtr is reset to zero, and the next cycle is restarted by the same. Therefore, the staggered opening of the hydrogen discharge valve and the drain valve is realized by dynamically adjusting the opening and closing time sequence of the hydrogen discharge valve and the drain valve, and the stability of the working pressure of the hydrogen loop of the fuel cell can be realized without complex algorithm and a large amount of calibration, so that the service life of a galvanic pile is prolonged.
In an embodiment, when the hydrogen discharge valve opening command and the drain valve opening command are detected at the same time, on the basis of keeping the period and/or the opening duration of the hydrogen discharge and the drain water unchanged, the method further includes:
when the command for opening the hydrogen discharge valve is detected, if the current drain valve is in an open state, controlling the hydrogen discharge valve to keep a closed state, and counting the delay time of the hydrogen discharge valve through a hydrogen discharge valve counter;
closing the drain valve and stopping counting by the hydrogen discharge valve counter when a drain valve closing command is detected;
and opening the hydrogen discharge valve, and counting down the hydrogen discharge valve counter until the hydrogen discharge valve counter is reset to zero.
Specifically, a hydrogen discharge valve request command req_purg and a drain valve request command req_wtr are detected; when the drain valve opening command req_wtr=1 is detected, and then the hydrogen discharge valve opening command req_purg=1 is detected, only the drain valve is opened, at the moment, the hydrogen discharge valve is controlled to keep a closed state, and meanwhile, the hydrogen discharge valve counter Npurg starts to count the delay time of the hydrogen discharge valve; when the drain valve closing command req_wtr=0 is detected, closing the drain valve, stopping counting by the hydrogen discharge valve counter Npurg, opening the hydrogen discharge valve at the moment, starting counting down the delay time of the hydrogen discharge valve by the hydrogen discharge valve counter Npurg, closing the hydrogen discharge valve after the hydrogen discharge valve counter Npurg is reset to zero, and so on, and reentering the next cycle. Therefore, the staggered opening of the hydrogen discharge valve and the drain valve is realized by dynamically adjusting the opening and closing time sequence of the hydrogen discharge valve and the drain valve, and the stability of the working pressure of the hydrogen loop of the fuel cell can be realized without complex algorithm and a large amount of calibration, so that the service life of a galvanic pile is prolonged.
In one embodiment, the method further comprises:
determining a basic hydrogen spraying amount according to the current system power request;
and adjusting the given value of the hydrogen spraying amount according to the difference value of the basic hydrogen spraying amount and the actual hydrogen spraying amount.
Specifically, a basic hydrogen injection amount is calculated according to parameters such as current pile working current and hydrogen pressure to obtain a target hydrogen pressure panode_req, an actual hydrogen pressure panode_act is obtained according to the actual hydrogen injection amount, a difference value between the target hydrogen pressure panode_req and the actual hydrogen pressure panode_act is input into a PID controller, and the difference value between the target hydrogen pressure panode_req and the actual hydrogen pressure panode_act is controlled to be zero so as to adjust a hydrogen injection amount set value duty_req.
In one embodiment, the method further comprises:
acquiring the temperature of cooling liquid of a galvanic pile;
acquiring a hydrogen pressure correction factor according to the temperature of the cooling liquid of the electric pile;
and performing primary hydrogen pressure compensation according to the hydrogen pressure correction factor.
Specifically, the temperature T of the cooling liquid of the electric pile is monitored in real time, and the hydrogen pressure correction factor is calculated according to the temperature T of the cooling liquid of the electric pile and used as a calculation parameter for once compensating the hydrogen pressure, so that the hydrogen pressure can react in time along with the change of the working environment of the fuel cell system. Because the temperature has a large influence on the gas, the hydrogen pressure correction factor can be calibrated according to different temperatures.
In one embodiment, the method further comprises:
acquiring the opening state of a hydrogen discharge valve;
and performing secondary hydrogen pressure compensation according to the opening state of the hydrogen discharge valve.
Here, the opening state of the hydrogen discharge valve is obtained to predict and compensate the pressure of the hydrogen circuit. When the hydrogen discharge valve is in an open state, calculating or calibrating according to a hydrodynamic formula to obtain the hydrogen to be compensated so as to carry out secondary compensation on the hydrogen pressure; and when the hydrogen discharge valve is in a closed state, closing the hydrogen pressure secondary compensation. Therefore, aiming at the phenomenon that the hydrogen pressure is reduced in the opening process of the hydrogen discharge valve, the opening state of the hydrogen discharge valve is introduced to serve as feed-forward input of the hydrogen injection quantity, the hydrogen pressure in the hydrogen discharge process is compensated, the hydrogen supply is stably output, the repeated fluctuation of the anode pressure in the opening period of the hydrogen discharge valve is avoided, and the stability of the hydrogen loop pressure is further improved.
The technical solution of the foregoing embodiments will be described in detail by way of specific examples based on the same inventive concept as the foregoing embodiments. Fig. 2 is a schematic flow chart of a fuel cell hydrogen circuit pressure control method according to an embodiment of the present invention, including the following steps:
step S201: initializing npurg=0; nwtr=0;
here, npurg=0 indicates that the hydrogen discharge valve counter is zeroed, and nwtr=0 indicates that the drain valve counter is zeroed.
Step S202: req_purg=1? If yes, executing step S204, otherwise executing step S203;
here, it is determined whether req_purg is 1, and req_purg=1 indicates a hydrogen discharge valve opening command.
Step S203: req_wtr=1? If yes, go to step S212, otherwise go to step S209;
here, it is determined whether req_wtr is 1, and req_wtr=1 indicates a drain valve open command.
Step S204: npurg >0? If yes, go to step S205, otherwise go to step S206;
here, it is determined whether npugg is greater than 0, npugg >0 indicating that the hydrogen discharge valve counter is greater than zero.
Step S205: npurg = Npurg-1;
here, npurg=npurg-1 represents the hydrogen discharge valve counter countdown.
Step S206: req_wtr=1? If yes, go to step S207, otherwise go to step S208;
step S207: nwtr = Nwtr +1;
here, nwtr=nwtr+1 represents the drain valve counter timing.
Step S208: req_purg=0 npurg=0? If yes, go to step S209, otherwise go to step S206;
here, req_purg=0 indicates a hydrogen discharge valve closing command.
Step S209: output command st_purg=req_purg; st_wtr=req_wtr;
here, st_purg=req_purg represents a hydrogen discharge valve command output; st_wtr=req_wtr represents the drain valve instruction output.
Step S210: nwtr >0? If yes, go to step S214, otherwise go to step S211;
here, it is determined whether Nwtr is greater than 0, and Nwtr >0 indicates that the drain valve counter is greater than zero.
Step S211: npurg >0? If yes, executing step S206, otherwise executing step S201;
step S212: nwtr >0? If yes, go to step S213, otherwise go to step S214;
step S213: nwtr = Nwtr-1;
here, nwtr=nwtr-1 indicates the drain valve counter count down.
Step S214: req_purg=1? If yes, go to step S215, otherwise go to step S216;
step S215: npurg=npurg+1;
here, npurg=npurg+1 denotes the hydrogen discharge valve counter timing.
Step S216: is req_wtr=0 nwtr=0? If yes, step S209 is executed, otherwise step S214 is executed.
The technical solution of the foregoing embodiments will be described in detail by way of specific examples based on the same inventive concept as the foregoing embodiments. Fig. 3 is a logic diagram of pressure feedforward compensation control of a fuel cell hydrogen circuit pressure control method according to an embodiment of the present invention, including the following steps:
step S301: panode_act; panode_req; t is input into a PID controller;
here, panode_act represents the actual hydrogen pressure, panode_req represents the target hydrogen pressure, and T represents the stack coolant temperature. Determining a target hydrogen pressure Panode_Req according to the system power request, obtaining an actual hydrogen pressure Panode_Act according to the actual hydrogen injection quantity, inputting a difference value between the target hydrogen pressure Panode_Req and the actual hydrogen pressure Panode_Act into a PID controller, and controlling the difference value between the target hydrogen pressure Panode_Req and the actual hydrogen pressure Panode_Act to be zero. Meanwhile, the temperature T of the cooling liquid of the electric pile is monitored in real time, and a hydrogen pressure correction factor is calculated according to the temperature T of the cooling liquid of the electric pile and is used as a calculation parameter for one-time compensation of the hydrogen pressure.
Step S302: st_Purg is input to a feedforward controller;
here, st_purg represents a hydrogen discharge valve command output, and may include a hydrogen discharge valve opening command or a hydrogen discharge valve closing command. When the feedforward controller obtains a hydrogen discharge valve opening instruction, calculating or calibrating according to a hydrodynamic formula to obtain the hydrogen to be compensated so as to carry out secondary hydrogen pressure compensation; or closing the hydrogen pressure to compensate for the second time when the closing instruction of the hydrogen discharge valve is acquired.
Step S303: the duty_req is obtained from the outputs of the PID controller and the feedforward controller.
Here, duty_req indicates a given hydrogen injection amount. And outputting and obtaining the given duty_req of the hydrogen injection amount according to the primary hydrogen pressure compensation of the PID controller and the secondary hydrogen pressure compensation of the feedforward controller.
In summary, the difference between the actual hydrogen pressure and the target hydrogen pressure is used as the input of the PID controller, the temperature of the cooling liquid of the electric pile is monitored in real time, the hydrogen pressure correction factor is calculated according to the temperature of the cooling liquid of the electric pile to be used as the primary hydrogen pressure compensation, the opening state of the hydrogen discharge valve is introduced to be used as the feed-forward input for the hydrogen injection quantity setting, and when the hydrogen discharge valve is in the opening state, the hydrogen pressure secondary compensation is carried out. Therefore, the stability of the pressure of the hydrogen loop is further improved, so that the stable output of the system power is ensured, and the service life of the electric pile is prolonged.
Based on the same inventive concept as the previous embodiments, the present embodiment provides a fuel cell hydrogen circuit pressure control apparatus, as shown in fig. 4, including: a processor 110 and a memory 111 for storing a computer program capable of running on the processor 110; the number of the processors 110 illustrated in fig. 4 is not used to refer to one number of the processors 110, but is merely used to refer to a positional relationship of the processors 110 relative to other devices, and in practical applications, the number of the processors 110 may be one or more; likewise, the memory 111 illustrated in fig. 4 is also used in the same sense, that is, only to refer to the positional relationship of the memory 111 with respect to other devices, and in practical applications, the number of the memories 111 may be one or more. The processor 110 is configured to implement the fuel cell hydrogen circuit pressure control method when executing the computer program.
The fuel cell hydrogen circuit pressure control device may further include: at least one network interface 112. The various components of the fuel cell hydrogen circuit pressure control device are coupled together by a bus system 113. It is understood that the bus system 113 is used to enable connected communications between these components. The bus system 113 includes a power bus, a control bus, and a status signal bus in addition to the data bus. But for clarity the various buses are labeled in fig. 4 as bus system 113.
The memory 111 may be a volatile memory or a nonvolatile memory, or may include both volatile and nonvolatile memories. Wherein the nonvolatile Memory may be Read Only Memory (ROM), programmable Read Only Memory (PROM, programmable Read-Only Memory), erasable programmable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), electrically erasable programmable Read Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), magnetic random access Memory (FRAM, ferromagnetic random access Memory), flash Memory (Flash Memory), magnetic surface Memory, optical disk, or compact disk Read Only Memory (CD-ROM, compact Disc Read-Only Memory); the magnetic surface memory may be a disk memory or a tape memory. The volatile memory may be random access memory (RAM, random Access Memory), which acts as external cache memory. By way of example, and not limitation, many forms of RAM are available, such as static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory). The memory 111 described in embodiments of the present invention is intended to comprise, without being limited to, these and any other suitable types of memory.
The memory 111 in the embodiment of the present invention is used to store various types of data to support the operation of the fuel cell hydrogen circuit pressure control device. Examples of such data include: any computer program, such as an operating system and application programs, for operation on the fuel cell hydrogen circuit pressure control device; contact data; telephone book data; a message; a picture; video, etc. The operating system includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, for implementing various basic services and processing hardware-based tasks. The application programs may include various application programs such as a Media Player (Media Player), a Browser (Browser), etc. for implementing various application services. Here, a program for implementing the method of the embodiment of the present invention may be included in an application program.
Based on the same inventive concept as the previous embodiments, the present embodiment also provides a vehicle including the fuel cell hydrogen circuit pressure control device as described above.
Based on the same inventive concept as the previous embodiments, the present embodiment further provides a computer storage medium in which a computer program is stored, where the computer storage medium may be a Memory such as a magnetic random access Memory (FRAM, ferromagnetic random access Memory), a Read Only Memory (ROM), a programmable Read Only Memory (PROM, programmable Read-Only Memory), an erasable programmable Read Only Memory (EPROM, erasable Programmable Read-Only Memory), an electrically erasable programmable Read Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical disk, or a compact disk Read Only Memory (CD-ROM, compact Disc Read-Only Memory); but may be a variety of devices including one or any combination of the above-described memories, such as a mobile phone, computer, tablet device, personal digital assistant, or the like. The above-described fuel cell hydrogen circuit pressure control method is implemented when a computer program stored in the computer storage medium is executed by a processor. The specific step flow implemented when the computer program is executed by the processor is described with reference to the embodiment shown in fig. 1, and will not be described herein.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements is included, and may include other elements not expressly listed.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A fuel cell hydrogen circuit pressure control method, comprising:
determining a period and/or an opening duration of hydrogen discharge and water discharge according to the current system power request;
when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, on the basis of keeping the period and/or the opening duration of the hydrogen discharge and the drain water unchanged, the opening moments of the hydrogen discharge valve and the drain valve are staggered;
when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, on the basis of keeping the period and/or the opening duration of the hydrogen discharge valve and the drain valve unchanged, the method for staggering the opening moments of the hydrogen discharge valve and the drain valve comprises the following steps:
when the drain valve opening command is detected, if the current hydrogen discharge valve is in an opening state, controlling the drain valve to keep a closing state; and
when the opening command of the hydrogen discharge valve is detected, if the current water discharge valve is in an opening state, the hydrogen discharge valve is controlled to be kept in a closing state.
2. The method according to claim 1, wherein when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, staggering the opening timings of the hydrogen discharge valve and the drain valve on the basis of keeping the cycle and/or the opening period of the hydrogen discharge and the drain water unchanged, comprises:
when the drain valve opening command is detected, if the current hydrogen discharge valve is in an opening state, controlling the drain valve to keep a closing state, and counting the delay time of the drain valve through a drain valve counter;
when a hydrogen discharge valve closing command is detected, closing the hydrogen discharge valve and stopping counting by the drain valve counter;
and opening the drain valve, and counting down the drain valve counter until the drain valve counter is reset to zero.
3. The method according to claim 1, wherein when a hydrogen discharge valve opening command and a drain valve opening command are detected at the same time, staggering the opening timings of the hydrogen discharge valve and the drain valve on the basis of keeping the cycle and/or the opening period of the hydrogen discharge and the drain water unchanged, comprises:
when the command for opening the hydrogen discharge valve is detected, if the current drain valve is in an open state, controlling the hydrogen discharge valve to keep a closed state, and counting the delay time of the hydrogen discharge valve through a hydrogen discharge valve counter;
closing the drain valve and stopping counting by the hydrogen discharge valve counter when a drain valve closing command is detected;
and opening the hydrogen discharge valve, and counting down the hydrogen discharge valve counter until the hydrogen discharge valve counter is reset to zero.
4. The fuel cell hydrogen circuit pressure control method according to claim 1, characterized by further comprising:
determining a basic hydrogen spraying amount according to the current system power request;
and adjusting the given value of the hydrogen spraying amount according to the difference value of the basic hydrogen spraying amount and the actual hydrogen spraying amount.
5. The fuel cell hydrogen circuit pressure control method according to claim 1, characterized by further comprising:
acquiring the temperature of cooling liquid of a galvanic pile;
acquiring a hydrogen pressure correction factor according to the temperature of the cooling liquid of the electric pile;
and performing primary hydrogen pressure compensation according to the hydrogen pressure correction factor.
6. The fuel cell hydrogen circuit pressure control method according to claim 1, characterized by further comprising:
acquiring the opening state of a hydrogen discharge valve;
and performing secondary hydrogen pressure compensation according to the opening state of the hydrogen discharge valve.
7. The fuel cell hydrogen circuit pressure control method according to claim 6, wherein said performing hydrogen pressure secondary compensation according to the opening state of the hydrogen discharge valve comprises:
when the hydrogen discharge valve is in an open state, performing secondary compensation on the hydrogen pressure; or alternatively
And when the hydrogen discharge valve is in a closed state, closing the hydrogen pressure secondary compensation.
8. A fuel cell hydrogen circuit pressure control device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the fuel cell hydrogen circuit pressure control method according to any one of claims 1 to 7 when executing the computer program.
9. A vehicle comprising the fuel cell hydrogen circuit pressure control device according to claim 8.
10. A computer storage medium storing a computer program, characterized in that the computer program when executed by a processor realizes the steps of the fuel cell hydrogen circuit pressure control method according to any one of claims 1 to 7.
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| JP2010080434A (en) * | 2008-08-26 | 2010-04-08 | Honda Motor Co Ltd | Fuel cell system |
| KR20130065030A (en) * | 2011-12-09 | 2013-06-19 | 현대자동차주식회사 | Apparatus and method for controlling anode pressure of fuel cell |
| CN111799488A (en) * | 2020-06-24 | 2020-10-20 | 中国第一汽车股份有限公司 | Current-based hydrogen discharge valve and method for controlling opening frequency of water discharge valve |
| CN112635791A (en) * | 2020-12-18 | 2021-04-09 | 东风汽车集团有限公司 | Hydrogen supply control method for hydrogen fuel cell automobile |
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| JP2010080434A (en) * | 2008-08-26 | 2010-04-08 | Honda Motor Co Ltd | Fuel cell system |
| KR20130065030A (en) * | 2011-12-09 | 2013-06-19 | 현대자동차주식회사 | Apparatus and method for controlling anode pressure of fuel cell |
| CN111799488A (en) * | 2020-06-24 | 2020-10-20 | 中国第一汽车股份有限公司 | Current-based hydrogen discharge valve and method for controlling opening frequency of water discharge valve |
| CN112635791A (en) * | 2020-12-18 | 2021-04-09 | 东风汽车集团有限公司 | Hydrogen supply control method for hydrogen fuel cell automobile |
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