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CN114976149B - Control method and system of fuel cell engine thermal management system - Google Patents

Control method and system of fuel cell engine thermal management system Download PDF

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Publication number
CN114976149B
CN114976149B CN202210678278.9A CN202210678278A CN114976149B CN 114976149 B CN114976149 B CN 114976149B CN 202210678278 A CN202210678278 A CN 202210678278A CN 114976149 B CN114976149 B CN 114976149B
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water pump
fuel cell
opening
cell engine
way valve
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CN114976149A (en
Inventor
刘岩
赵洪辉
李金成
丁天威
韩令海
黄兴
曲禄成
段盼
郝志强
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FAW Group Corp
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FAW Group Corp
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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
    • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
    • H01M8/04029—Heat exchange using liquids
    • 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
    • H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
    • H01M8/04067—Heat exchange or temperature measuring elements, thermal insulation, e.g. heat pipes, heat pumps, fins
    • H01M8/04074—Heat exchange unit structures specially adapted for fuel cell
    • 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
    • H01M8/0432—Temperature; Ambient temperature
    • H01M8/04358—Temperature; Ambient temperature of the coolant
    • 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
    • H01M8/04537—Electric variables
    • H01M8/04544—Voltage
    • H01M8/04559—Voltage of fuel cell stacks
    • 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
    • H01M8/04537—Electric variables
    • H01M8/04574—Current
    • H01M8/04589—Current of fuel cell stacks
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

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  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Fuel Cell (AREA)
  • Automation & Control Theory (AREA)
  • Artificial Intelligence (AREA)
  • Computing Systems (AREA)
  • Evolutionary Computation (AREA)
  • Fuzzy Systems (AREA)
  • Medical Informatics (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Health & Medical Sciences (AREA)

Abstract

The invention discloses a control method and a control system of a fuel cell engine thermal management system. The control method of the fuel cell engine heat management system comprises the following steps: acquiring the inlet temperature and the outlet temperature of a water pump of a cooling water pump of a fuel cell engine; determining heat generation of the fuel cell engine; determining the opening delay time of a third channel switch of the three-way valve; and determining the first opening of the third channel switch of the three-way valve according to the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine, the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve. The technical scheme provided by the embodiment of the invention improves the control precision of the control method of the fuel cell engine thermal management system.

Description

Control method and system of fuel cell engine thermal management system
Technical Field
The invention relates to the field of fuel cell automobiles, in particular to a control method and a control system of a fuel cell engine thermal management system.
Background
Fuel cell automobiles are one of the main categories of clean energy automobiles, and are also the final form of future automobile development.
In the prior art, fuel cells are used to provide a source of electrical energy for a fuel cell engine that can drive a fuel cell vehicle to travel on a road. Heat is inevitably generated during operation of the fuel cell engine. Therefore, a control system of a fuel cell engine thermal management system is required to dissipate heat for the fuel cell engine. The control system of the fuel cell engine heat management system comprises a three-way valve, a fuel cell engine cooling water pump, and a large circulation cooling loop and a small circulation cooling loop which are connected in parallel between a water pump inlet and a water pump outlet of the fuel cell engine cooling water pump. The temperature of the coolant of the large circulation cooling circuit is smaller than the temperature of the coolant of the small circulation cooling circuit. And the cooling liquid of the large circulation cooling loop and the small circulation cooling loop enters a cooling water pump of the fuel cell engine to dissipate heat of the fuel cell engine. The fuel cell engine cooling water pump is disposed inside the fuel cell engine.
The control method of the existing fuel cell engine thermal management system mainly comprises the steps of judging whether a water pump inlet temperature interval of a fuel cell engine cooling water pump is in a reasonable interval range under the action of a small circulation cooling loop, if the heat dissipation requirement is not met, opening a channel switch in a three-way valve corresponding to a large circulation cooling loop, and further cooling the cooling liquid through the large circulation cooling loop; fitting the opening value of a channel switch in a three-way valve corresponding to the large circulation cooling loop into a function value of the inlet temperature of the fuel cell engine, and performing corresponding action according to the current temperature value. However, the control method only considers the opening and closing functions of the three-way valve, and does not consider that the three-way valve cannot cool the cooling liquid in the delay time of the opening process, so that the regulation and control of the inlet temperature of the fuel cell engine cannot reach the expected effect, and the inlet temperature of the fuel cell engine is greatly fluctuated.
Therefore, there is an urgent need for a control method of a fuel cell engine thermal management system with high control accuracy.
Disclosure of Invention
The invention provides a control method and a control system of a fuel cell engine thermal management system, which improve the control of the control method of the fuel cell engine thermal management system with high control precision.
In a first aspect, the present invention provides a control method of a thermal management system of a fuel cell engine, including:
The fuel cell engine thermal management system includes three-way valve, fuel cell engine cooling water pump, and connect in parallel big circulation cooling circuit and little circulation cooling circuit between the water pump entry and the water pump export of fuel cell engine cooling water pump, the first access switch and the second access switch of three-way valve are used for controlling little circulation cooling circuit, the third access switch of three-way valve is used for controlling big circulation cooling circuit, the temperature of the coolant liquid of big circulation cooling circuit is less than the temperature of the coolant liquid of little circulation cooling circuit, include:
Acquiring the inlet temperature and the outlet temperature of a water pump of a cooling water pump of a fuel cell engine;
determining heat generation of the fuel cell engine;
determining the opening delay time of a third channel switch of the three-way valve;
And determining the first opening of the third channel switch of the three-way valve according to the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine, the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve.
Optionally, determining the first opening of the third channel switch of the three-way valve according to the water pump inlet temperature of the cooling water pump of the fuel cell engine, the water pump outlet temperature, the generated heat of the fuel cell engine, and the opening delay time of the third channel switch of the three-way valve includes:
Determining a second opening of a third channel switch of the three-way valve according to the water pump inlet temperature of the cooling water pump of the fuel cell engine, the water pump outlet temperature and the generated heat of the fuel cell engine;
and determining the first opening of the third channel switch of the three-way valve according to the second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve.
Optionally, determining the first opening of the third channel switch of the three-way valve according to the second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve includes:
Determining a first opening of a third channel switch of the three-way valve according to a second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve, wherein the average value of the first opening in the opening time is larger than the second opening; the opening time of the third channel switch of the three-way valve is the same as the pre-opening time.
Optionally, determining the first opening of the third channel switch of the three-way valve according to the second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve includes:
Determining a first opening of a third channel switch of the three-way valve according to a second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve, wherein the first opening is equal to the second opening; the time that the opening time of the third channel switch of the three-way valve is earlier than the pre-opening time is the opening delay time of the third channel switch of the three-way valve.
Optionally, determining the heat generated by the fuel cell engine includes:
Acquiring a low-heating-value voltage of a battery of a fuel battery stack in a fuel battery engine;
acquiring the actual voltage of a fuel cell stack;
acquiring the actual current of a fuel cell stack;
The heat generation of the fuel cell engine is determined based on the cell low heating value voltage, the actual voltage, and the actual current of the fuel cell stack.
Optionally, determining the opening delay time of the third channel switch of the three-way valve includes:
acquiring the temperature change of the inlet temperature of a water pump and the temperature change of the outlet temperature of the water pump of a cooling water pump of a fuel cell engine before and after a third channel switch of a three-way valve is opened;
and determining the opening delay time of the third channel switch of the three-way valve according to the temperature change of the inlet temperature of the water pump and the temperature change of the outlet temperature of the water pump of the cooling water pump of the fuel cell engine before and after the third channel switch of the three-way valve is opened.
Optionally, determining the second opening of the third channel switch of the three-way valve according to the water pump inlet temperature, the water pump outlet temperature and the generated heat of the cooling water pump of the fuel cell engine includes:
determining a water pump inlet temperature variation according to the cooling water pump of the fuel cell engine according to the heat radiation parameters of the radiator circulation loop, the water pump inlet temperature of the cooling water pump of the fuel cell engine, the water pump outlet temperature and the generated heat of the fuel cell engine;
determining a water pump outlet temperature variation according to the cooling water pump of the fuel cell engine according to the heat radiation parameters of the radiator circulation loop, the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine and the generated heat of the fuel cell engine;
determining a third opening of a third channel switch of the three-way valve by the minimum value of the water pump inlet temperature variation of the cooling water pump of the fuel cell engine;
determining a fourth opening of a third channel switch of the three-way valve by using the minimum value of the water pump outlet temperature variation of the cooling water pump of the fuel cell engine;
and the opening corresponding to the intersection of the third opening and the fourth opening is the second opening.
Optionally, determining the third opening of the third channel switch of the three-way valve by the minimum value of the water pump inlet temperature variation amount of the fuel cell engine includes:
the opening degree when the water pump inlet temperature variation amount of the fuel cell engine approaches 0 is the third opening degree of the third channel switch of the three-way valve.
Optionally, after the water pump inlet temperature of the fuel cell engine reaches the heating threshold, determining the first opening of the third channel switch of the three-way valve according to the water pump inlet temperature of the cooling water pump of the fuel cell engine, the water pump outlet temperature, the generated heat of the fuel cell engine, and the opening delay time of the third channel switch of the three-way valve further includes:
Acquiring the inlet temperature of a water pump of the fuel cell engine again;
Determining the fluctuation of the inlet temperature of the water pump of the cooling water pump of the fuel cell engine according to the inlet temperature of the water pump of the cooling water pump of the fuel cell engine;
and adjusting the opening value of a third channel switch of the three-way valve according to the water pump inlet temperature fluctuation of the cooling water pump of the fuel cell engine.
In a second aspect, an embodiment of the present invention provides a thermal management system for a fuel cell engine, where the control method of the thermal management system for a fuel cell engine according to any embodiment of the present invention is adopted.
According to the control method of the fuel cell engine thermal management system, the water pump inlet temperature of the fuel cell engine cooling water pump is used as a control target, the first opening of the third channel switch of the three-way valve is determined according to the water pump inlet temperature and the water pump outlet temperature of the fuel cell engine cooling water pump, the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve, the actual opening of the third channel switch of the three-way valve in the large circulation cooling loop is controlled, the situation that cooling liquid cannot be cooled in the delay time of the opening process is compensated, the control precision of the control method of the fuel cell engine thermal management system is improved, the aim of minimizing the temperature change of the fuel cell engine thermal management system is achieved, the water pump inlet temperature of the fuel cell engine cooling water pump is kept to be the optimal value, and stable and efficient operation of the fuel cell system is guaranteed.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a diagram showing a thermal management system of a fuel cell engine according to a first embodiment of the present invention;
Fig. 2 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a first embodiment of the present invention;
FIG. 3 is a flow chart of a control method included in step 120 of FIG. 2;
FIG. 4 is a flow chart of a control method included in step 130 of FIG. 2;
Fig. 5 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a second embodiment of the present invention;
fig. 6 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a third embodiment of the present invention;
Fig. 7 is a flowchart of a control method of a thermal management system of a fuel cell engine according to still another embodiment of the present invention;
Fig. 8 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a fifth embodiment of the present invention;
fig. 9 is a flowchart of a control method of a thermal management system of a fuel cell engine according to still another embodiment of the invention;
Fig. 10 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a seventh embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
The present embodiment provides a control method of a thermal management system of a fuel cell engine, which is applicable to accurate prediction of temperature conditions of the thermal management system of the fuel cell engine, and the method may be performed by a control device of the thermal management system of the fuel cell engine, and the device may be implemented in hardware and/or software. Fig. 1 is a block diagram of a thermal management system for a fuel cell engine according to a first embodiment of the present invention, and referring to fig. 1, a control system for a thermal management system for a fuel cell engine includes a three-way valve 020, a fuel cell engine cooling water pump 010, and a large circulation cooling loop L2 and a small circulation cooling loop L1 connected in parallel between a water pump inlet and a water pump outlet of the fuel cell engine cooling water pump 010. The fuel cell is used for providing an electric energy source for a fuel cell engine, and the fuel cell engine can drive a fuel cell automobile to run on a road. Heat is inevitably generated during operation of the fuel cell engine. Therefore, a control system of a fuel cell engine thermal management system is required to dissipate heat for the fuel cell engine. The large circulation cooling circuit L2 is provided with the radiator 030, and therefore the temperature of the coolant of the large circulation cooling circuit L2 is smaller than the temperature of the coolant of the small circulation cooling circuit L1. The coolant of the large circulation cooling circuit L2 and the small circulation cooling circuit L1 enters the fuel cell engine cooling water pump 010 for heat dissipation of the fuel cell engine. The fuel cell engine cooling water pump 010 is provided inside the fuel cell engine. Fig. 2 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a first embodiment of the present invention, and referring to fig. 2, the method includes the steps of:
Step 110, acquiring the inlet temperature and outlet temperature of a cooling water pump of the fuel cell engine.
With reference to fig. 1, the cooling water pump 010 of the fuel cell engine is the most core component of the fuel cell engine, and has the function of providing cooling circulating water with certain flow and pressure under different operation conditions of the fuel cell so as to meet the heat dissipation requirement of the fuel cell engine. The inlet temperature and the outlet temperature of the cooling water pump 010 of the fuel cell engine are monitored in real time, whether the inlet temperature reaches a heating threshold value is observed, so that the large circulation cooling loop L2 can be started to further radiate heat for the fuel cell engine, and safety accidents are avoided. In this embodiment, the fuel cell may be a hydrogen fuel cell excellent in performance.
Step 120, determining the heat generated by the fuel cell engine.
The fuel cell can provide a power signal for the fuel cell engine, and heat is also generated in the operation process of the fuel cell engine.
Fig. 3 is a flowchart of a control method included in step 120 of fig. 2. Optionally, referring to fig. 3, step 120 of determining the heat generated by the fuel cell engine includes:
Step 1201, obtaining a cell low heating value voltage of a fuel cell stack in a fuel cell engine.
Wherein U Lhv represents the fuel cell low heating value voltage.
Step 1202, obtaining an actual voltage of a fuel cell stack.
Where U stack,actual represents the actual voltage of the fuel cell stack.
Step 1203, obtaining an actual current of the fuel cell stack.
Wherein I stack represents the actual current of the fuel cell stack.
Step 1204, determining heat generation of the fuel cell engine based on the low heating value voltage, the actual voltage, and the actual current of the cells of the fuel cell stack.
Wherein the generated heat Q fuel of the fuel cell engine can be calculated by the formula Q fuel＝(ULhv-Ustack,actual)*Istack.
And 130, determining the opening delay time of a third channel switch of the three-way valve.
Wherein, the time delay in the opening process of the third switch of the three-way valve for controlling the large circulation cooling loop.
Fig. 4 is a flowchart of a control method included in step 130 of fig. 2. Optionally, determining the opening delay time of the third channel switch of the three-way valve in step 130 includes:
step 1301, acquiring the temperature change of the inlet temperature of the water pump and the temperature change of the outlet temperature of the water pump of the cooling water pump of the fuel cell engine before and after the third channel switch of the three-way valve is opened.
Wherein, the time delayed before and after the third channel switch of the three-way valve is opened is used for monitoring the inlet temperature change and the outlet temperature change of the water pump.
Step 1302, determining the opening delay time of the third channel switch of the three-way valve according to the temperature change of the inlet temperature of the water pump and the temperature change of the outlet temperature of the water pump of the cooling water pump of the fuel cell engine before and after the third channel switch of the three-way valve is opened.
And 140, determining a first opening of a third channel switch of the three-way valve according to the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine, the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve.
When the inlet temperature of the water pump reaches the heating threshold, the third channel switch of the three-way valve is in an open state, and the first opening is the actual opening of the third channel switch of the three-way valve.
According to the control method of the fuel cell engine thermal management system, the water pump inlet temperature of the fuel cell engine cooling water pump is used as a control target, the first opening of the third channel switch of the three-way valve is determined according to the water pump inlet temperature and the water pump outlet temperature of the fuel cell engine cooling water pump, the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve, the actual opening of the third channel switch of the three-way valve in the large circulation cooling loop is controlled, the situation that cooling liquid cannot be cooled in the delay time of the opening process is compensated, the control precision of the control method of the fuel cell engine thermal management system is improved, the aim of minimizing the temperature change of the fuel cell engine thermal management system is achieved, the water pump inlet temperature of the fuel cell engine cooling water pump is kept to be the optimal value, and stable and efficient operation of the fuel cell system is guaranteed.
Example two
Fig. 5 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a second embodiment of the present invention, and based on the above embodiment, referring to fig. 5, step 140 is preferably optimized as step 240 and step 250. Referring to fig. 5, the control method includes the steps of:
step 210, acquiring a water pump inlet temperature and a water pump outlet temperature of a cooling water pump of the fuel cell engine.
Step 220, determining the heat generated by the fuel cell engine.
Step 230, determining the opening delay time of the third channel switch of the three-way valve.
The implementation and benefits of steps 210-230 may be performed with reference to the implementation and benefits of steps 110-130.
Step 240, determining the second opening of the third channel switch of the three-way valve according to the inlet temperature of the cooling water pump of the fuel cell engine, the outlet temperature of the water pump and the generated heat of the fuel cell engine.
And the third channel switch of the three-way valve is opened at the moment according to the temperature of the inlet of the water pump of the fuel cell engine reaching the heating threshold, wherein the second opening of the third channel switch of the three-way valve is the theoretical opening, and the opening delay time of the three-way valve is not considered.
Step 250, determining the first opening of the third channel switch of the three-way valve according to the second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve.
Wherein, according to the water pump inlet temperature of the fuel cell engine reaches the heating threshold, at this moment the third channel switch of three-way valve opens, and the first aperture of the third channel switch of three-way valve is actual aperture, needs to consider the opening delay time of three-way valve.
According to the embodiment, on the basis of considering the system time delay, the second opening of the third channel switch of the three-way valve is determined according to the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine and the generated heat of the fuel cell engine, the first opening of the third channel switch of the three-way valve is determined according to the second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve, the opening of the third channel switch of the three-way valve in the large circulation cooling loop is controlled, the situation that cooling liquid cannot be cooled in the delay time of the opening process due to the three-way valve is compensated, the control precision of the control method of the thermal management system of the fuel cell engine is improved, the aim of minimizing the temperature change of the thermal management system of the fuel cell engine is achieved, the water pump inlet temperature of the cooling water pump of the fuel cell engine is kept to be the optimal value, and stable and efficient operation of the fuel cell system is guaranteed.
Example III
Fig. 6 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a third embodiment of the present invention, where the present embodiment is based on the above-mentioned embodiment. As shown in fig. 6, the method includes:
Step 310, obtaining a water pump inlet temperature and a water pump outlet temperature of a cooling water pump of the fuel cell engine.
Step 320, determining the heat generated by the fuel cell engine.
Step 330, determining the opening delay time of the third channel switch of the three-way valve.
The implementation and benefits of steps 310-330 may be performed with reference to the implementation and benefits of steps 110-130.
Step 340, determining a second opening of a third channel switch of the three-way valve according to the water pump inlet temperature, the water pump outlet temperature and the generated heat of the fuel cell engine.
Step 350, determining a first opening of a third channel switch of the three-way valve according to a second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve, wherein the average value of the first opening in the opening time is larger than the second opening; the opening time of the third channel switch of the three-way valve is the same as the pre-opening time.
The second opening of the third channel switch of the three-way valve is a theoretical opening, the opening delay time of the three-way valve is used for determining that the first opening of the third channel switch of the three-way valve is an actual opening, and when the opening time is the same under the condition of considering time delay, the actual opening value is larger than the theoretical opening value so as to meet the accurate control temperature of the fuel cell and minimize the temperature change.
According to the embodiment, on the basis of considering the system time delay, the opening time of the third channel switch of the three-way valve is controlled to be the same, and the first opening (actual opening) is larger than the second opening (theoretical opening), so that the situation that cooling liquid cannot be cooled in the delay time of the opening process of the three-way valve is compensated, the control precision of the control method of the thermal management system of the fuel cell engine is improved, the aim of minimizing the temperature change of the thermal management system of the fuel cell engine is achieved, the inlet temperature of the water pump of the cooling water pump of the fuel cell engine is kept to be the optimal value, and the stable and efficient operation of the fuel cell system is ensured.
Fig. 7 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a fourth embodiment of the present invention, where the fourth embodiment is based on the above-mentioned embodiment. As shown in fig. 7, the method includes:
step 410, obtaining a water pump inlet temperature and a water pump outlet temperature of a cooling water pump of the fuel cell engine.
Step 420, determining the heat generated by the fuel cell engine.
Step 430, determining the opening delay time of the third channel switch of the three-way valve.
Step 440, determining a second opening of a third channel switch of the three-way valve according to the water pump inlet temperature of the cooling water pump of the fuel cell engine, the water pump outlet temperature and the generated heat of the fuel cell engine.
The implementation and benefits of steps 410-440 may be performed with reference to the implementation and benefits of steps 310-340.
Step 450, determining a first opening of a third channel switch of the three-way valve according to a second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve, wherein the first opening is equal to the second opening; the time that the opening time of the third channel switch of the three-way valve is earlier than the pre-opening time is the opening delay time of the third channel switch of the three-way valve.
The second opening of the third channel switch of the three-way valve is a theoretical opening, the opening delay time of the three-way valve is used for determining that the first opening of the third channel switch of the three-way valve is an actual opening, and when the actual opening value is equal to the theoretical opening value under the condition of considering time delay, the opening time of the first opening is earlier than the delay time of the switch so as to meet the accurate control temperature of the fuel cell and minimize the temperature change.
According to the embodiment, on the basis of considering the system time delay, the time that the opening time of the third channel switch of the three-way valve is earlier than the pre-opening time is the opening delay time of the third channel switch of the three-way valve, so that the situation that cooling liquid cannot be cooled in the delay time of the opening process of the three-way valve is compensated, the control precision of the control method of the thermal management system of the fuel cell engine is improved, the aim of minimizing the temperature change of the thermal management system of the fuel cell engine is achieved, the inlet temperature of the water pump of the cooling water pump of the fuel cell engine is kept to be the optimal value, and the stable and efficient operation of the fuel cell system is ensured.
Example five
Fig. 8 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a fifth embodiment of the present invention, where the present embodiment is based on the above-mentioned embodiment. As shown in fig. 5, the method includes:
Step 510, obtaining the inlet temperature and outlet temperature of the cooling water pump of the fuel cell engine.
Step 520, determining heat generation of the fuel cell engine.
Step 530, determining the opening delay time of the third channel switch of the three-way valve.
The implementation and benefits of steps 510-530 may be performed with reference to the implementation and benefits of steps 110-130.
Step 540, determining the variation of the water pump inlet temperature according to the cooling water pump of the fuel cell engine according to the heat dissipation parameter of the radiator circulation loop, the water pump inlet temperature of the cooling water pump of the fuel cell engine, the water pump outlet temperature and the generated heat of the fuel cell engine.
Recording a parameter value of a pile system, and calculating the parameter value b, c, g, h of the system based on a least square principle by an optimizing algorithm to obtain a formula (1) of the water pump inlet temperature variation of the cooling water pump of the fuel cell engine:
Specifically, n 1 represents the water pump inlet temperature, n 2 represents the water pump outlet temperature, The derivative of the inlet temperature of the water pump, namely the variation of the inlet temperature of the water pump, and u p represents the rotating speed instruction of the water pump.
Equation (1) contains the opening degree of the third passage switch of the three-way valve.
Step 550, determining the variation of the outlet temperature of the cooling water pump according to the heat dissipation parameter of the radiator circulation loop, the inlet temperature of the cooling water pump of the fuel cell engine, the outlet temperature of the water pump and the generated heat of the fuel cell engine.
Recording a parameter value of a pile system, and calculating the parameter value b, c, g, h of the system based on a least square principle by an optimizing algorithm to obtain a formula (2) of the water pump inlet temperature variation of the cooling water pump of the fuel cell engine:
Specifically, n 1 represents the water pump inlet temperature, n 2 represents the water pump outlet temperature, The derivative of the outlet temperature of the water pump, i.e. the variation of the outlet temperature of the water pump, u f represents the fan speed command.
Equation (2) contains the opening degree of the third passage switch of the three-way valve.
And 560, determining a third opening of a third channel switch of the three-way valve by the minimum value of the water pump inlet temperature change amount of the cooling water pump of the fuel cell engine.
Wherein whenAnd when the minimum value is taken, determining a third opening of a third channel switch of the three-way valve, wherein the third opening is an opening range.
And 570, determining the fourth opening of the third channel switch of the three-way valve by the minimum value of the water pump outlet temperature variation of the cooling water pump of the fuel cell engine.
Wherein whenAnd taking the minimum value as the fourth opening of the third channel switch of the three-way valve, wherein the fourth opening is an opening range.
In step 580, the opening corresponding to the intersection of the third opening and the fourth opening is the second opening.
Wherein,Represents the water pump inlet temperature variation of the cooling water pump of the fuel cell engine,Represents the water pump outlet temperature variation of the cooling water pump of the fuel cell engine,When the minimum value is taken, the third opening degree of the third channel switch of the three-way valve can be determined,And when the minimum value is taken, determining a fourth opening of a third channel switch of the three-way valve, wherein the opening corresponding to the intersection of the third opening and the fourth opening is the second opening.
Example six
Fig. 9 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a sixth embodiment of the present invention, where the present embodiment is based on the above-mentioned embodiment. As shown in fig. 9, the method includes:
Step 610, obtaining a water pump inlet temperature and a water pump outlet temperature of a cooling water pump of the fuel cell engine.
Step 620, determining the heat generated by the fuel cell engine.
Step 630, determining the opening delay time of the third channel switch of the three-way valve.
Step 640, determining a variation amount according to the water pump inlet temperature of the cooling water pump of the fuel cell engine according to the heat dissipation parameter of the radiator circulation loop, the water pump inlet temperature of the cooling water pump of the fuel cell engine, the water pump outlet temperature and the generated heat of the fuel cell engine.
Step 650, determining the variation of the outlet temperature of the cooling water pump according to the heat dissipation parameter of the radiator circulation loop, the inlet temperature of the cooling water pump of the fuel cell engine, the outlet temperature of the water pump and the generated heat of the fuel cell engine.
The implementation and benefits of steps 610-650 may be performed with reference to the implementation and benefits of steps 510-550.
Step 660, the opening degree when the water pump inlet temperature variation amount of the cooling water pump of the fuel cell engine approaches 0 is the third opening degree of the third channel switch of the three-way valve.
Wherein, the variation of the inlet temperature of the water pump of the fuel cell engine is minimum, and the minimum value is 0, so that the temperature can be accurately controlled.
Step 670, determining a fourth opening of a third channel switch of the three-way valve by the minimum value of the water pump outlet temperature variation of the fuel cell engine.
In step 680, the opening corresponding to the intersection of the third opening and the fourth opening is the second opening.
The implementation and benefits of steps 670-680 may be performed with reference to the implementation and benefits of steps 570-580.
Wherein,Represents the water pump inlet temperature variation of the cooling water pump of the fuel cell engine,Represents the water pump outlet temperature variation of the cooling water pump of the fuel cell engine,When the minimum value of 0 is taken, the third opening degree of the third channel switch of the three-way valve can be determined,And when the minimum value is taken, determining a fourth opening of a third channel switch of the three-way valve, wherein the opening corresponding to the intersection of the third opening and the fourth opening is the second opening.
Example seven
Fig. 10 is a flowchart of a control method of a thermal management system of a fuel cell engine according to a seventh embodiment of the present invention, where the present embodiment is based on the foregoing embodiment. Optionally, referring to fig. 10, the method includes:
step 710, acquiring a water pump inlet temperature and a water pump outlet temperature of a cooling water pump of the fuel cell engine.
Step 720, determining the heat generated by the fuel cell engine.
Step 730, determining an opening delay time of a third channel switch of the three-way valve.
The implementation and benefits of steps 710-730 may be performed with reference to the implementation and benefits of steps 610-630.
Step 740, determining that the inlet temperature of the water pump of the fuel cell engine reaches the heating threshold.
Whether the opening instruction of the three-way valve is sent or not is judged by whether the heating threshold value is reached or not.
And 750, determining the first opening of a third channel switch of the three-way valve according to the water pump inlet temperature, the water pump outlet temperature and the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve.
The implementation and benefits of step 750 may be performed with reference to the implementation and benefits of step 140.
Step 760, the water pump inlet temperature of the fuel cell engine is again obtained.
Step 770, determining a water pump inlet temperature fluctuation of the fuel cell engine cooling water pump according to the water pump inlet temperature of the fuel cell engine cooling water pump.
And 780, judging whether the water pump inlet temperature of the cooling water pump of the fuel cell engine reaches the water pump inlet temperature fluctuation of the cooling water pump of the fuel cell engine.
And step 790, adjusting the opening value of a third channel switch of the three-way valve according to the water pump inlet temperature fluctuation of the cooling water pump of the fuel cell engine.
For example, the preset water pump inlet temperature fluctuation may be 1 ℃. And if the fluctuation of the inlet temperature of the water pump of the cooling water pump of the fuel cell engine is less than 1 ℃, adjusting the opening value of the third channel switch of the three-way valve according to the fluctuation of the inlet temperature of the water pump of the cooling water pump of the fuel cell engine. If the pump inlet temperature fluctuation of the fuel cell engine cooling water pump is greater than 1 ℃, the re-performing step 750 requires re-determining the first opening of the third passage switch of the three-way valve.
On the basis of the technical scheme, after the water pump inlet temperature of the fuel cell engine reaches the heating threshold, the first opening degree of the third channel switch of the three-way valve is determined according to the water pump inlet temperature, the water pump outlet temperature and the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve, so that the cooling liquid of the large circulation cooling loop and the small circulation cooling loop enters the fuel cell engine cooling water pump to be used for radiating the fuel cell engine, the water pump inlet temperature of the fuel cell engine is acquired again, the opening degree value of the third channel switch of the three-way valve is adjusted according to the water pump inlet temperature fluctuation of the fuel cell engine cooling water pump, the control precision of the water pump inlet temperature of the fuel cell engine cooling water pump can be improved, the aim of minimizing the temperature change of a fuel cell engine heat management system is achieved, the water pump inlet temperature of the fuel cell engine cooling water pump is kept to be the optimal value, and stable and efficient operation of the fuel cell system is ensured.
The embodiment of the invention also provides a fuel cell engine thermal management system, and the control method of the fuel cell engine thermal management system is adopted. Therefore, the heat management system for the fuel cell engine provided by the embodiment of the invention has the beneficial effects of the heat management control method for the fuel cell engine, and is not described herein.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (7)

1. A control method of a fuel cell engine heat management system including a three-way valve, a fuel cell engine cooling water pump, and a large circulation cooling circuit and a small circulation cooling circuit connected in parallel between a water pump inlet and a water pump outlet of the fuel cell engine cooling water pump, a first passage switch and a second passage switch of the three-way valve being used for controlling the small circulation cooling circuit, a third passage switch of the three-way valve being used for controlling the large circulation cooling circuit, a temperature of a coolant of the large circulation cooling circuit being smaller than a temperature of a coolant of the small circulation cooling circuit, characterized by comprising:
Acquiring the inlet temperature and the outlet temperature of a water pump of a cooling water pump of a fuel cell engine;
determining heat generation of the fuel cell engine;
determining the opening delay time of a third channel switch of the three-way valve;
The method comprises the steps that the temperature of a water pump inlet of a cooling water pump of a fuel cell engine reaches a heating threshold, and the first opening of a third channel switch of a three-way valve is determined according to the temperature of the water pump inlet of the cooling water pump of the fuel cell engine, the temperature of a water pump outlet, the heat generated by the fuel cell engine and the opening delay time of the third channel switch of the three-way valve;
The method is characterized in that the step of determining the first opening of the third channel switch of the three-way valve according to the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine, the generated heat of the fuel cell engine and the opening delay time of the third channel switch of the three-way valve comprises the following steps:
determining a second opening of a third channel switch of the three-way valve according to the inlet temperature of a water pump of the cooling water pump of the fuel cell engine, the outlet temperature of the water pump and the generated heat of the fuel cell engine;
Determining a first opening of a third channel switch of the three-way valve according to a second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve;
determining the opening delay time of the third channel switch of the three-way valve includes:
acquiring the temperature change of the inlet temperature of a water pump and the temperature change of the outlet temperature of the water pump of a cooling water pump of a fuel cell engine before and after a third channel switch of a three-way valve is opened;
Determining the opening delay time of a third channel switch of the three-way valve according to the temperature change of the inlet temperature of a water pump and the temperature change of the outlet temperature of the water pump of the cooling water pump of the fuel cell engine before and after the third channel switch of the three-way valve is opened;
Determining the second opening of the third channel switch of the three-way valve according to the water pump inlet temperature, the water pump outlet temperature and the generated heat of the cooling water pump of the fuel cell engine comprises:
determining a water pump inlet temperature variation according to the cooling water pump of the fuel cell engine according to heat dissipation parameters of a radiator circulation loop, the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine and the generated heat of the fuel cell engine;
Determining a water pump outlet temperature variation according to the cooling water pump of the fuel cell engine according to the heat radiation parameters of the radiator circulation loop, the water pump inlet temperature and the water pump outlet temperature of the cooling water pump of the fuel cell engine and the generated heat of the fuel cell engine;
the minimum value of the temperature change amount of the water pump inlet of the cooling water pump of the fuel cell engine is used for determining the third opening of a third channel switch of the three-way valve;
the minimum value of the water pump outlet temperature variation of the cooling water pump of the fuel cell engine is used for determining the fourth opening of the third channel switch of the three-way valve;
And the opening corresponding to the intersection of the third opening and the fourth opening is the second opening.
2. The control method of a fuel cell engine heat management system according to claim 1, wherein determining the first opening of the third passage switch of the three-way valve according to the second opening of the third passage switch of the three-way valve and the opening delay time of the three-way valve includes:
Determining a first opening of a third channel switch of the three-way valve according to a second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve, wherein the average value of the first opening in the opening time is larger than the second opening; the opening time of the third channel switch of the three-way valve is the same as the pre-opening time.
3. The control method of a fuel cell engine heat management system according to claim 1, wherein determining the first opening of the third passage switch of the three-way valve according to the second opening of the third passage switch of the three-way valve and the opening delay time of the three-way valve includes:
Determining a first opening of a third channel switch of the three-way valve according to a second opening of the third channel switch of the three-way valve and the opening delay time of the three-way valve, wherein the first opening is equal to the second opening; the time when the opening time of the third channel switch of the three-way valve is earlier than the pre-opening time is the opening delay time of the third channel switch of the three-way valve.
4. The control method of a fuel cell engine heat management system according to claim 1, wherein determining the generated heat of the fuel cell engine comprises:
Acquiring a low-heating-value voltage of a battery of a fuel battery stack in a fuel battery engine;
acquiring the actual voltage of a fuel cell stack;
acquiring the actual current of a fuel cell stack;
And determining the generated heat of the fuel cell engine according to the low-heating-value voltage, the actual voltage and the actual current of the cells of the fuel cell stack.
5. The control method of a fuel cell engine heat management system according to claim 1, wherein determining a third opening of a third passage switch of a three-way valve with a minimum amount of change in a water pump inlet temperature of the fuel cell engine cooling water pump includes:
and the opening degree of the water pump inlet temperature variation of the cooling water pump of the fuel cell engine is the third opening degree of the third channel switch of the three-way valve when the water pump inlet temperature variation approaches 0.
6. The control method of a fuel cell engine heat management system according to claim 1, wherein determining the first opening of the third passage switch of the three-way valve after the water pump inlet temperature of the fuel cell engine cooling water pump reaches the heating threshold value based on the water pump inlet temperature of the fuel cell engine cooling water pump, the water pump outlet temperature, and the generated heat of the fuel cell engine and the opening delay time of the third passage switch of the three-way valve further comprises:
Acquiring the inlet temperature of a water pump of the fuel cell engine again;
Determining the fluctuation of the inlet temperature of the water pump of the cooling water pump of the fuel cell engine according to the inlet temperature of the water pump of the cooling water pump of the fuel cell engine;
And adjusting the opening value of a third channel switch of the three-way valve according to the water pump inlet temperature fluctuation of the cooling water pump of the fuel cell engine.
7. A thermal management system for a fuel cell engine, characterized by employing the control method of the thermal management system for a fuel cell engine according to any one of claims 1 to 6.
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