CN110212218B - Detection method and system for fuel cell three-way valve - Google Patents
Detection method and system for fuel cell three-way valve Download PDFInfo
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- CN110212218B CN110212218B CN201910579151.XA CN201910579151A CN110212218B CN 110212218 B CN110212218 B CN 110212218B CN 201910579151 A CN201910579151 A CN 201910579151A CN 110212218 B CN110212218 B CN 110212218B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0432—Temperature; Ambient temperature
- H01M8/04358—Temperature; Ambient temperature of the coolant
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/04664—Failure or abnormal function
- H01M8/04679—Failure or abnormal function of fuel cell stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a method and a system for detecting a three-way valve of a fuel cell, which are used for detecting the current working state of a hydrogen fuel cell engine by acquiring the current working state of the hydrogen fuel cell engine; when a fuel cell engine is in a cold start state, acquiring a first temperature value of a cooling liquid entering a stack at a first preset time point; when the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value, determining the clamping stagnation of the three-way valve; when the fuel cell engine is in a normal power generation state, if the current second temperature value of the reactor cooling liquid is greater than a second preset temperature value and the rotating speed of the cooling fan is greater than a preset rotating speed, judging whether a third temperature value of the reactor cooling liquid is greater than a third preset temperature value at a second preset time point; and if the third temperature value is greater than a third preset temperature value, determining the clamping stagnation of the three-way valve. By the detection method of the three-way valve of the fuel cell, the temperature of the cooling liquid entering the stack is obtained in real time, and whether the three-way valve is blocked or not is judged according to the temperature, so that the purpose of detecting the three-way valve is achieved.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a method and a system for detecting a three-way valve of a fuel cell.
Background
A hydrogen fuel cell is a chemical device that directly converts chemical energy of fuel into electric energy, and is also called an electrochemical generator. The hydrogen fuel cell is a fourth power generation technology following hydro power generation, thermal power generation, and atomic power generation. The hydrogen fuel cell converts the Gibbs free energy in the chemical energy of the fuel into electric energy through electrochemical reaction, and is not limited by the Carnot cycle effect, so the efficiency is high; in addition, hydrogen fuel cells use hydrogen fuel and oxygen as raw materials, and emit very little harmful gas. However, the coolant temperature of the hydrogen fuel cell engine is strongly related to the chemical reaction rate, and directly affects the cold start performance of the whole vehicle and the dynamic performance during normal operation, so the temperature of the coolant entering the stack and the temperature difference between the coolant leaving the stack and the coolant entering the stack need to be strictly controlled, and the important component for adjusting the coolant temperature is the electric three-way valve.
However, in the prior art, because do not carry out real-time detection to electric three-way valve, when electric three-way valve appears the jamming, can't learn the three-way valve very first time and appear the jamming, the coolant liquid temperature that leads to going into heap coolant liquid temperature and going out of pile and going into the heap is too big, and the coolant liquid temperature and the chemical reaction rate of hydrogen fuel cell engine are relevant strongly, consequently, when the jamming appears in electric three-way valve, because the behavior that does not have the real-time supervision three-way valve, can not in time handle the problem of three-way valve jamming, can lead to the dynamic nature of hydrogen fuel cell cold start-up performance and normal working in-process can seriously descend.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and a system for detecting a three-way valve of a fuel cell, which detect the temperature of a coolant in real time and determine whether the three-way valve is stuck according to the temperature change of the coolant, so as to achieve the purpose of detecting the three-way valve.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention discloses a detection method of a three-way valve of a fuel cell, which is suitable for a hydrogen fuel cell, wherein the hydrogen fuel cell comprises a hydrogen gas path, an air path and a water management path, the three-way valve is positioned on the water management path, and a temperature and pressure sensor is arranged on the water management path, and the method comprises the following steps:
determining the current working state of the hydrogen fuel cell engine, wherein the working state comprises a cold starting state and a normal power generation state;
when the hydrogen fuel cell engine is in the cold starting state, acquiring a first temperature value of the cooling liquid entering the stack at a first preset time point;
judging whether the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value or not;
if the difference value is smaller than the first preset temperature value, determining the clamping stagnation of the three-way valve;
when the hydrogen fuel cell engine is in the normal power generation state, judging whether a current second temperature value of the reactor-entering cooling liquid is larger than a second preset temperature value and whether the rotating speed of a cooling fan is larger than a preset rotating speed, wherein the second preset temperature value is larger than the first preset temperature value;
if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, judging whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point;
and if the third temperature value is greater than the third preset temperature value, determining that the three-way valve is blocked.
Preferably, when the hydrogen fuel cell engine is in the cold start state, acquiring a first temperature value of the reactor coolant at a first preset time point includes:
when the hydrogen fuel cell engine is in the cold starting state, when a first timer starts to count, acquiring the current temperature value of the reactor coolant as an initial temperature value;
and when the timing time of the first timer reaches a first preset time point, acquiring a first temperature value of the cooling liquid in the reactor at the first preset time point.
Preferably, if the second temperature value is greater than the second preset temperature value, and the rotation speed of the cooling fan is greater than the preset rotation speed, it is determined at a second preset time point whether a third temperature value of the reactor coolant is greater than a third preset temperature value, including:
if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, starting a second timer for timing;
when the timing time of the second timer reaches a second preset time point, acquiring a third temperature value of the current cooling liquid in the reactor;
and judging whether the third temperature value is greater than a third preset temperature value.
Preferably, the method further comprises the following steps:
when the hydrogen fuel cell engine is in the cold start state, acquiring a current temperature value of the cooling liquid entering the stack as an initial temperature value;
monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length;
detecting the number of the stored time lengths in real time;
when the number of the stored time lengths reaches a preset number, calculating the average value of the stored time lengths;
determining whether the three-way valve is stuck based on the average value.
Preferably, the determining whether the three-way valve is stuck based on the average value includes:
comparing the average value with a preset average value;
and if the average value is larger than the preset average value, determining that the three-way valve is blocked.
Preferably, the method further comprises the following steps:
when the hydrogen fuel cell engine is in the cold start state, acquiring a current temperature value of the cooling liquid entering the stack as an initial temperature value;
monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length;
detecting the number of the stored time lengths in real time;
when the number of the stored time lengths reaches a preset number, calculating a difference value between the time length recorded at the previous moment and the time length recorded at the later moment;
and if the difference value is not 0, determining that the three-way valve is blocked.
The second aspect of the present invention discloses a detection system for a three-way valve of a fuel cell, which is suitable for a hydrogen fuel cell, wherein the hydrogen fuel cell comprises a hydrogen gas path, an air gas path and a water management path, the three-way valve is located on the water management path, and the water management path is provided with a temperature and pressure sensor, the system comprises:
a first determination unit for determining a current operating state of the hydrogen fuel cell engine, the operating state including a cold start state and a normal power generation state;
the first acquiring unit is used for acquiring a first temperature value of the cooling liquid of the reactor at a first preset time point when the hydrogen fuel cell engine is in the cold starting state;
the first judgment unit is used for judging whether the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value or not;
the second determining unit is used for determining the clamping stagnation of the three-way valve if the difference value is smaller than the first preset temperature value;
the second judgment unit is used for judging whether a current second temperature value of the reactor coolant is greater than a second preset temperature value and whether the rotating speed of a cooling fan is greater than a preset rotating speed or not when the hydrogen fuel cell engine is in the normal power generation state, wherein the second preset temperature value is greater than the first preset temperature value;
a third judging unit, configured to judge whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point if the second temperature value is greater than the second preset temperature value and the rotation speed of the cooling fan is greater than the preset rotation speed;
and the third determining unit is used for determining the clamping stagnation of the three-way valve if the third temperature value is greater than the third preset temperature value.
Preferably, the first obtaining unit includes:
the first acquiring subunit is used for acquiring the current temperature value of the reactor coolant as an initial temperature value when the hydrogen fuel cell engine is in the cold starting state and the first timer starts to count;
and the second acquiring subunit is configured to acquire a first temperature value of the reactor cooling liquid at a first preset time point when the timing time of the first timer reaches the first preset time point.
Preferably, the third judging unit includes:
the starting sub-unit is used for starting a second timer to time if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed;
the third acquiring subunit is configured to acquire a third temperature value of the current reactor coolant when the timing time of the second timer reaches a second preset time point;
and the judging subunit is used for judging whether the third temperature value is greater than a third preset temperature value.
Preferably, the method further comprises the following steps:
a second obtaining unit, configured to obtain a current temperature value of the reactor coolant as an initial temperature value when the hydrogen fuel cell engine is in the cold start state;
the first storage unit is used for monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length;
the first detection unit is used for detecting the number of the stored time lengths in real time;
the first calculating unit is used for calculating the average value of the stored time lengths when the number of the stored time lengths reaches a preset number;
a fourth determination unit for determining whether the three-way valve is stuck based on the average value.
From the above, the present application discloses a method and system for detecting a three-way valve of a fuel cell, by obtaining the current operating state of a hydrogen fuel cell engine; when the hydrogen fuel cell engine is in the cold starting state, acquiring a first temperature value of the cooling liquid entering the stack at a first preset time point; judging whether the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value or not; if the difference value is smaller than the first preset temperature value, determining the clamping stagnation of the three-way valve; when the hydrogen fuel cell engine is in the normal power generation state, judging whether a current second temperature value of the reactor-entering cooling liquid is greater than a second preset temperature value and whether the rotating speed of a cooling fan is greater than a preset rotating speed; if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, judging whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point; and if the third temperature value is greater than the third preset temperature value, determining the jamming of the three-way valve. By the detection method of the three-way valve of the hydrogen fuel cell, the temperature of the cooling liquid entering the reactor is obtained in real time, and whether the three-way valve is blocked or not is judged according to the temperature, so that the purpose of detecting the three-way valve is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a fuel cell system according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for detecting a three-way valve of a fuel cell according to an embodiment of the present invention;
fig. 3 is a flow chart of a method for detecting a three-way valve of a fuel cell according to an embodiment of the present invention;
fig. 4 is a flow chart of another fuel cell three-way valve detection method according to an embodiment of the present invention;
FIG. 5 is a flow chart of another method for detecting a three-way valve of a fuel cell according to an embodiment of the present invention;
fig. 6 is a flow chart of another fuel cell three-way valve detection method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a detection system of a three-way valve of a fuel cell according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a detection system of a three-way valve of another fuel cell according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a detection system of a three-way valve of a fuel cell according to another embodiment of the present invention;
fig. 10 is a schematic structural diagram of another fuel cell three-way valve detection system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, 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, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides a detection method and a detection system for a three-way valve of a fuel cell, which can achieve the purpose of detecting whether the three-way valve is blocked or not by detecting the temperature of cooling liquid entering a reactor in real time and judging whether the three-way valve is in a blocked state or not according to the temperature. The application discloses a detection system of a fuel cell three-way valve, which comprises a timer, a temperature and pressure sensor and a processor, is suitable for a hydrogen fuel cell, as shown in fig. 1, the hydrogen fuel cell includes a hydrogen path 100, an air path 200, a water management path 300 and a stack 400, the water management circuit 300 includes an electric water pump 301, a PTC heater 302, a radiator 303, a three-way valve 304 and a temperature and pressure sensor 305, the water inlet of the electric water pump 301 is connected with the galvanic pile, the water outlet is connected with the water inlet of the three-way valve 301, the first water outlet is connected with the water inlet of the PCT heater 302, the second water outlet is connected with the water inlet of the radiator 303, the water outlet of the radiator 303 and the water outlet of the PCT heater 302 are connected with the water inlet of the galvanic pile, the temperature and pressure sensor 305 is arranged on a pipeline between the water outlet of the radiator 303 and the water outlet of the PCT heater 302 and connected with the water inlet of the galvanic pile.
Wherein the processor and the timer are not shown in fig. 1.
When the hydrogen fuel cell engine is started, that is, when the hydrogen fuel cell engine is in a cold start state, the three-way valve is in a first conduction state, and in the first conduction state, the electric water pump 301 is started to deliver the coolant to the stack through the PTC heater 302, and at this time, the PTC heater 302 is started to heat the coolant entering the stack.
When the temperature in the stack reaches a threshold value, the working state of the hydrogen fuel cell engine is a normal power generation state at the moment, the three-way valve is in a second conduction state, the electric water pump 301 conveys the stack-entering cooling liquid to the stack through the radiator 303 under the second conduction state, and the radiator 303 radiates the stack-entering cooling liquid at the moment.
It should be noted that a hydrogen fuel cell is a device in which hydrogen and air chemically react inside a stack to generate water, and can convert chemical energy into electrical energy and release heat. When the ambient temperature is low, the chemical reaction of the hydrogen fuel cell is difficult to perform, so the coolant needs to be heated, the coolant flows through the chemical reactor, the coolant transfers the temperature to the reactor, the reactor is rapidly heated to reach the temperature at which the chemical reaction can be performed, and the working state of the hydrogen fuel cell is the cold start in the process. When the hydrogen fuel cell works normally, the chemical energy is converted into the electric energy to release heat, the temperature of the electric pile can be increased, the chemical reaction rate can be influenced by overhigh temperature, and therefore, cooling liquid is required to carry part of heat in the pile, and the temperature of the electric pile is kept within a certain range.
In this application, gather through temperature and pressure sensor 305 in real time the income heap cooling liquid temperature in water pipe reason way 300 to gather through the time-recorder to twice temperature acquisition interval, transmit the temperature value and the time interval value of gathering to the treater again, whether jamming appears in the treater through the processing result judgement three-way valve, thereby reach the purpose that whether jamming appears in the real-time detection three-way valve.
Based on the hydrogen fuel cell shown in fig. 1, an embodiment of the present invention provides a method for detecting a three-way valve of a fuel cell, which at least includes the following steps, with reference to fig. 2:
step S201: the current working state of the hydrogen fuel cell engine is determined, if the working state is a cold start state, step S202 is executed, and if the working state is a normal power generation state, step S205 is executed.
In step S201, the operating state includes a cold start state and a normal power generation state.
It should be noted that a hydrogen fuel cell is a device in which hydrogen and air chemically react inside a stack to generate water, and can convert chemical energy into electrical energy and release heat. When the ambient temperature is low, the chemical reaction of the hydrogen fuel cell is difficult to perform, so the coolant needs to be heated, the coolant flows through the chemical reactor, the coolant transfers the temperature to the reactor, the reactor is rapidly heated to reach the temperature at which the chemical reaction can be performed, and the working state of the hydrogen fuel cell is the cold start in the process. When the hydrogen fuel cell works normally, the chemical energy is converted into the electric energy to release heat, the temperature of the electric pile can be increased, the chemical reaction rate can be influenced by overhigh temperature, and therefore, cooling liquid is required to carry part of heat in the pile, and the temperature of the electric pile is kept within a certain range.
The current working state of the hydrogen fuel cell engine can be determined by acquiring the temperature of the stack cooling liquid, and can also be determined by acquiring the temperature of the electric stack.
Step S202: and acquiring a first temperature value of the cooling liquid in the reactor at a first preset time point.
It should be noted that the first temperature value of the reactor coolant at the first preset time point is the first temperature value acquired by the temperature acquisition device at the preset time point after the hydrogen fuel cell engine is cold started.
The temperature acquisition device corresponds to the temperature and pressure sensor 305 shown in fig. 1, but is not limited thereto, and may be a device having a temperature acquisition function, such as a temperature sensor.
In the process of executing step S202, as shown in fig. 3, the specific execution process includes the following steps:
step S301: and when the hydrogen fuel cell engine is in the cold starting state and the first timer starts to count, acquiring the current temperature value of the stack-entering cooling liquid as an initial temperature value.
Step S302: and when the timing time of the first timer reaches a first preset time point, acquiring a first temperature value of the cooling liquid in the reactor at the first preset time point.
It should be noted that the first timer is a timer in the detection system of the fuel cell three-way valve, and the timer can start timing when the hydrogen fuel cell engine is in a cold start state, and collect the current temperature value of the reactor coolant as an initial temperature value through the temperature collecting device. When the timing time of the timer reaches a first preset time point, the temperature value of the reactor-entering cooling liquid is collected through the temperature collecting equipment and is used as a first temperature value.
Step S203: and judging whether the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value, if so, executing the step S204, and if not, executing the step S205.
It should be noted that the initial temperature value is a temperature value obtained by collecting the current temperature of the stack-entering cooling liquid when the hydrogen fuel cell engine is in cold start and the PTC heater is in normal operation.
The first preset temperature value is an empirical value, and different equipment is in different environments, so that the first preset temperature value is different. In the present application, the magnitude of the first preset temperature value is not limited.
Step S204: determining the three-way valve sticking.
Note that, since the three-way valve is in the first conduction state when the hydrogen fuel cell engine is in the cold start state, the temperature of the coolant can be raised by both the PTC heater and the reaction of the hydrogen fuel cell in the stack. If only the temperature of the coolant is increased by the heat generated by the reaction of the hydrogen fuel cell in the stack, and the temperature increase rate of the coolant is much slower than that of the coolant caused by the heating of the coolant by the PTC heater, at the first predetermined time point, the first predetermined temperature is compared with the temperature increase amount in the first predetermined time period, and when the temperature increase amount at the first predetermined time point is smaller than the first predetermined temperature, that is, when the difference value is smaller than the first predetermined temperature value, it can be said that the three-way valve is in the stuck state.
Step S205: the three-way valve is normal.
Step S206: and judging whether the current second temperature value of the stacked cooling liquid is greater than a second preset temperature value or not and whether the rotating speed of the cooling fan is greater than a preset rotating speed or not, if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, executing a step S207, otherwise, returning to the step S201.
In step S206, the second preset temperature value is greater than the first preset temperature value.
It should be noted that, when the temperature of the stack coolant rises to a certain value after the hydrogen fuel cell engine in the stack is cold-started, that is, the second preset temperature value is greater than the first preset temperature value, when the hydrogen fuel cell engine in the stack starts to enter a normal power generation state, the temperature of the stack coolant is not particularly high, the rotation speed of the radiator fan is low, but the temperature of the stack coolant can be reduced, at the same time, the temperature of the stack coolant may also be reduced to the temperature of the hydrogen fuel cell engine during cold start, the hydrogen fuel cell engine is in a cold start state again, and the three-way valve is switched back and forth according to the working state of the hydrogen fuel cell engine, so in this application, only when the temperature of the stack coolant is greater than the second preset temperature value, and the rotation speed of the radiator fan is greater than the preset rotation speed, it is explained that the hydrogen fuel cell engine in the stack is in a normal power generation state at this time.
The heat dissipation fan is the heat dissipation fan of the heat sink shown in fig. 1.
Step S207: and judging whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point, if so, executing a step S208, and if not, executing a step S209.
It should be noted that, in a normal power generation state, the three-way valve is in the second conduction state, the radiator can radiate the reactor coolant, so that the temperature of the reactor coolant is in an interval with stable temperature, if the three-way valve is not switched from the first conduction state to the second conduction state, the radiator cannot cool the reactor coolant, the reactor coolant can gradually rise at the moment, and the temperature collected in the later stage can be greater than a preset temperature value, so that whether the three-way valve is blocked or not can be judged by judging whether the third temperature value of the reactor coolant is greater than the third preset temperature value at the second preset time point.
In the process of executing step S207, as shown in fig. 4, the specific execution process includes the following steps:
step S401: and starting a second timer for timing.
Step S402: and when the timing time of the second timer reaches a second preset time point, acquiring a third temperature value of the current cooling liquid in the reactor.
It should be noted that, when the timing of the second timer reaches a second preset time point, a third temperature value of the current reactor coolant is obtained, which is equivalent to collecting the temperature of the reactor coolant every preset time period. The second preset time is determined according to actual requirements, and the smaller the second preset time interval is, the more frequently the temperature of the reactor-entering cooling liquid is acquired.
Step S403: and judging whether the third temperature value is greater than a third preset temperature value.
When the hydrogen fuel cell engine is in a normal power generation state, the three-way valve is in a second conduction state, the reactor-entering cooling liquid flows into the electric reactor through the radiator, the radiator can radiate the reactor-entering cooling liquid flowing through the radiator, so that the reactor-entering cooling liquid is in a temperature range, and when the temperature value of the reactor-entering cooling liquid is higher than the maximum value in the temperature range, namely a third preset temperature value, the three-way valve is in a clamping stagnation state at the moment. Therefore, when the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, the second timer is started to count, then when the second timer counts to reach the preset time point, the third temperature value of the current reactor cooling liquid is obtained, and finally whether the third temperature value is greater than the third preset temperature value or not is judged.
Step S208: determining the three-way valve sticking.
It should be noted that, if the third temperature value is greater than the third preset temperature value, it is indicated that the three-way valve is not in the second conduction state at this time, the radiator cannot cool the reactor coolant, and the current temperature of the reactor coolant is greater than the third preset temperature value, so that it can be determined that the three-way valve is in the stuck state.
Step S209: the three-way valve is normal.
The method comprises the steps of acquiring the current working state of a hydrogen fuel cell engine; when the hydrogen fuel cell engine is in the cold starting state, acquiring a first temperature value of the cooling liquid entering the stack at a first preset time point; judging whether the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value or not; if the difference value is smaller than the first preset temperature value, determining the clamping stagnation of the three-way valve; when the hydrogen fuel cell engine is in the normal power generation state, judging whether a current second temperature value of the reactor-entering cooling liquid is greater than a second preset temperature value and whether the rotating speed of a cooling fan is greater than a preset rotating speed; if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, judging whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point; and if the third temperature value is greater than the third preset temperature value, determining the jamming of the three-way valve. By the detection method of the three-way valve of the fuel cell, the temperature of the cooling liquid entering the stack is obtained in real time, and whether the three-way valve is blocked or not is judged according to the temperature, so that the purpose of detecting the three-way valve is achieved.
Preferably, based on the above disclosed method for detecting a three-way valve of a fuel cell, when the hydrogen fuel cell engine is in a cold start state, as shown in fig. 5, another method for detecting a three-way valve of a fuel cell may be used to detect whether the three-way valve is stuck, where the detection process includes the following steps:
step S501: and acquiring the current temperature value of the reactor entering cooling liquid as an initial temperature value.
Step S502: monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length.
In step S502, the preset temperature value is an empirical value, and in this application, the preset temperature value is preferably 1, but the preset temperature value is not limited to 1.
The duration is the time required when the temperature value of the reactor-entering cooling liquid is increased by a preset temperature value.
Step S503: and detecting the number of the stored time lengths in real time.
Step S504: and when the number of the stored time lengths reaches a preset number, calculating the average value of the stored time lengths.
In step S504, the average value is an average time when the temperature of the cooling liquid in the stack is increased by the preset temperature value, and the average time when the temperature of the cooling liquid in the stack is increased by the preset temperature value can be obtained by dividing the sum of the durations by the number.
When the hydrogen fuel cell engine is in a cold start state, the stack coolant is heated by the PCT heater, and the temperature of the stack coolant rises by the preset temperature value, which is fixed. Therefore, whether the three-way valve is blocked or not can be judged by the average value of the time length required for the reactor coolant to rise to the preset temperature value
Step S505: determining whether the three-way valve is stuck based on the average value.
It should be noted that, in the process of executing step S505, the specific implementation manner is as follows: comparing the average value with a preset average value. And if the average value is larger than the preset average value, determining that the three-way valve is blocked, and if the average value is smaller than the preset average value, determining that the three-way valve is in a normal conduction state.
The method comprises the steps of obtaining a current temperature value of the reactor entering cooling liquid as an initial temperature value; monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length; detecting the number of the stored time lengths in real time; when the number of the stored time lengths reaches a preset number, calculating the average value of the stored time lengths; determining whether the three-way valve is stuck based on the average value. According to the detection method of the three-way valve of the hydrogen fuel cell, when the hydrogen fuel cell engine is in a cold start state, the time length required when each liter of the stacked cooling liquid is increased by the preset temperature value is obtained, and finally the time length average value required when the stacked cooling liquid is increased by the preset temperature value is used for determining whether the three-way valve is blocked, so that the purpose of detecting the three-way valve is achieved.
Preferably, based on the above disclosed method for detecting a three-way valve of a fuel cell, when the hydrogen fuel cell engine is in a cold start state, as shown in fig. 6, another method for detecting a three-way valve of a fuel cell may be used to detect whether the three-way valve is stuck, where the detection process includes the following steps:
step S601: and acquiring the current temperature value of the reactor entering cooling liquid as an initial temperature value.
Step S602: monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length.
Step S603: and detecting the number of the stored time lengths in real time.
It should be noted that the execution principle and the specific execution process of steps S601 to S603 are the same as the execution principle and the specific execution process of steps S501 to S503 shown in fig. 4, and reference may be made to the above corresponding description, which is not repeated here.
Step S604: and when the number of the stored time lengths reaches a preset number, calculating the difference value between the time length recorded at the previous moment and the time length recorded at the later moment.
It should be noted that, when the hydrogen fuel cell engine is in a cold start state, the stack coolant is heated by the PCT heater, and the temperature of the stack coolant should be raised by a preset temperature value, so that the time required for the stack coolant to raise the preset temperature value at the previous time should be the same as the time required for the stack coolant to raise the preset temperature value at the next time, that is, the difference between the time required for the stack coolant to raise the preset temperature value at the previous time and the time required for the stack coolant to raise the preset temperature value at the next time should be 0, and if the time required for the stack coolant to raise the preset temperature value at the next time is longer than the time required for the stack coolant to raise the preset temperature value at the previous time, it is said that the three-way valve is stuck. Therefore, whether the three-way valve is blocked or not is judged according to the difference value by calculating the difference value between the time length recorded at the previous moment and the time length recorded at the later moment.
Step S605: and judging whether the difference value is 0, if not, executing the step S606, and if so, executing the step S607.
Step S606: and determining that the three-way valve is blocked.
Step S607: and determining that the three-way valve is in a normal conduction state.
The method comprises the steps of obtaining a current temperature value of the reactor entering cooling liquid as an initial temperature value; monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length; detecting the number of the stored time lengths in real time; when the number of the stored time lengths reaches a preset number, calculating a difference value between the time length recorded at the previous moment and the time length recorded at the later moment; and if the difference value is not 0, determining that the three-way valve is blocked. According to the detection method of the three-way valve of the fuel cell, when the hydrogen fuel cell engine is in a cold start state, the purpose of detecting the three-way valve is achieved by calculating the difference value of the time length required by every rising of the preset temperature value of the cooling liquid entering the stack at the previous moment and the time length required by every rising of the preset temperature value of the cooling liquid entering the stack at the later moment and determining whether the three-way valve is in a clamping stagnation state or not according to the difference value.
Corresponding to the method for detecting a three-way valve of a fuel cell disclosed in the embodiment of the present invention, the embodiment of the present invention provides a system for detecting a three-way valve of a fuel cell, which is suitable for a hydrogen fuel cell, where the hydrogen fuel cell includes a hydrogen path, an air path, and a water management path, the three-way valve is located on the water management path, and a temperature and pressure sensor is disposed on the water management path, as shown in fig. 7, the system includes:
a first determination unit 701 for determining the current operating state of the hydrogen fuel cell engine, the operating state including a cold start state and a normal power generation state;
a first obtaining unit 702, configured to obtain a first temperature value of the reactor coolant at a first preset time point when the hydrogen fuel cell engine is in the cold start state;
a first determining unit 703, configured to determine whether a difference between the first temperature value and the initial temperature value is smaller than a first preset temperature value;
a second determining unit 704, configured to determine that the three-way valve is stuck if the difference is smaller than the first preset temperature value;
a second determining unit 705, configured to determine, when the hydrogen fuel cell engine is in the normal power generation state, whether a current second temperature value of the reactor coolant is greater than a second preset temperature value, and whether a rotational speed of a cooling fan is greater than a preset rotational speed, where the second preset temperature value is greater than the first preset temperature value;
a third determining unit 706, configured to determine, if the second temperature value is greater than the second preset temperature value and the rotational speed of the cooling fan is greater than the preset rotational speed, whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point;
a third determining unit 707, configured to determine that the three-way valve is stuck if the third temperature value is greater than the third preset temperature value.
Preferably, as shown in fig. 8, the first obtaining unit 702 includes:
a first acquiring subunit 801, configured to acquire, when the hydrogen fuel cell engine is in the cold start state and a first timer starts to count, a current temperature value of the stack-entering coolant as an initial temperature value;
the second obtaining subunit 802 is configured to obtain a first temperature value of the reactor coolant at a first preset time point when the counted time of the first timer reaches the first preset time point.
Preferably, as shown in fig. 9, the third determining unit 706 includes:
a starting sub-unit 901, configured to start a second timer to time if the second temperature value is greater than the second preset temperature value and the rotation speed of the cooling fan is greater than the preset rotation speed;
a third obtaining subunit 902, configured to obtain a third temperature value of the current reactor coolant when the time counted by the second timer reaches a second preset time point;
a determining subunit 903, configured to determine whether the third temperature value is greater than a third preset temperature value.
Preferably, as shown in fig. 10, the fuel cell three-way valve detection system further includes:
a second obtaining unit 1001 configured to obtain a current temperature value of the reactor coolant as an initial temperature value when the hydrogen fuel cell engine is in the cold start state;
the storage unit 1002 is configured to monitor a temperature value of the reactor coolant in real time based on the initial temperature value, record a time length required for each time the temperature value of the reactor coolant is increased by a preset temperature value, and store the time length;
a detecting unit 1003, configured to detect the number of the stored durations in real time;
a calculating unit 1004, configured to calculate an average value of the stored time lengths when the number of the stored time lengths reaches a preset number;
a fourth determination unit 1005 for determining whether the three-way valve is stuck based on the average value.
Preferably, the fourth determining unit 1005 includes:
the comparison subunit is used for comparing the average value with a preset average value;
and the determining subunit is used for determining that the three-way valve is blocked if the average value is greater than the preset average value.
Preferably, the fuel cell three-way valve detection system further includes:
a third acquiring unit that acquires a current temperature value of the cooling liquid in the stack as an initial temperature value when the hydrogen fuel cell engine is in the cold start state;
the second storage unit is used for monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length;
the second detection unit is used for detecting the number of the stored time lengths in real time;
the second calculating unit is used for calculating the difference value between the time length recorded at the previous moment and the time length recorded at the later moment when the number of the stored time lengths reaches the preset number;
and the fifth determining unit is used for determining that the three-way valve is blocked if the difference value is not 0.
It should be noted that, for the specific implementation process and implementation principle of each module and unit in the detection system of the fuel cell three-way valve disclosed in the above embodiment of the present invention, reference may be made to the corresponding part of the detection method of the fuel cell three-way valve disclosed in the above embodiment of the present invention, and details are not repeated here.
The method comprises the steps that a first determination unit determines the current working state of a hydrogen fuel cell engine; the method comprises the steps that a first obtaining unit obtains a first temperature value of a cooling liquid entering a reactor at a first preset time point when the hydrogen fuel cell engine is in a cold starting state; the first judgment unit judges whether the difference value of the first temperature value and the initial temperature value is smaller than a first preset temperature value; if the difference value is smaller than the first preset temperature value, the second determining unit determines the clamping stagnation of the three-way valve; when the hydrogen fuel cell engine is in the normal power generation state, a second judgment unit judges whether a current second temperature value of the reactor coolant is greater than a second preset temperature value and whether the rotating speed of a cooling fan is greater than a preset rotating speed, wherein the second preset temperature value is greater than the first preset temperature value; if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, a third judgment unit judges whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point; and if the third temperature value is greater than the third preset temperature value, the third determining unit determines the three-way valve is blocked. Through the detection system of the fuel cell three-way valve, the temperature of the cooling liquid entering the stack is obtained in real time, and whether the three-way valve is blocked or not is judged according to the temperature, so that the purpose of detecting the three-way valve is achieved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A detection method of a three-way valve of a fuel cell is characterized by being applicable to a hydrogen fuel cell, wherein the hydrogen fuel cell comprises a hydrogen gas path, an air path and a water management path, the three-way valve is positioned on the water management path, and a temperature and pressure sensor is arranged on the water management path, and the method comprises the following steps:
determining the current working state of the hydrogen fuel cell engine, wherein the working state comprises a cold starting state and a normal power generation state;
when the hydrogen fuel cell engine is in the cold starting state, acquiring a first temperature value of the cooling liquid entering the stack at a first preset time point;
judging whether the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value or not;
if the difference value is smaller than the first preset temperature value, determining the clamping stagnation of the three-way valve;
when the hydrogen fuel cell engine is in the normal power generation state, judging whether a current second temperature value of the reactor-entering cooling liquid is larger than a second preset temperature value and whether the rotating speed of a cooling fan is larger than a preset rotating speed, wherein the second preset temperature value is larger than the first preset temperature value;
if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, judging whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point;
and if the third temperature value is greater than the third preset temperature value, determining that the three-way valve is blocked.
2. The method of claim 1, wherein obtaining a first temperature value of the stack coolant at a first preset time point when the hydrogen fuel cell engine is in the cold start state comprises:
when the hydrogen fuel cell engine is in the cold starting state, when a first timer starts to count, acquiring the current temperature value of the reactor coolant as an initial temperature value;
and when the timing time of the first timer reaches a first preset time point, acquiring a first temperature value of the cooling liquid in the reactor at the first preset time point.
3. The method of claim 1, wherein the determining whether a third temperature value of the reactor coolant is greater than a third predetermined temperature value at a second predetermined time point if the second temperature value is greater than the second predetermined temperature value and the cooling fan speed is greater than the predetermined speed comprises:
if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed, starting a second timer for timing;
when the timing time of the second timer reaches a second preset time point, acquiring a third temperature value of the current cooling liquid in the reactor;
and judging whether the third temperature value is greater than a third preset temperature value.
4. The method of claim 1, further comprising:
when the hydrogen fuel cell engine is in the cold start state, acquiring a current temperature value of the cooling liquid entering the stack as an initial temperature value;
monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length;
detecting the number of the stored time lengths in real time;
when the number of the stored time lengths reaches a preset number, calculating the average value of the stored time lengths;
determining whether the three-way valve is stuck based on the average value.
5. The method of claim 4, wherein the determining whether the three-way valve is stuck based on the average value comprises:
comparing the average value with a preset average value;
and if the average value is larger than the preset average value, determining that the three-way valve is blocked.
6. The method of claim 1, further comprising:
when the hydrogen fuel cell engine is in the cold start state, acquiring a current temperature value of the cooling liquid entering the stack as an initial temperature value;
monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length;
detecting the number of the stored time lengths in real time;
when the number of the stored time lengths reaches a preset number, calculating a difference value between the time length recorded at the previous moment and the time length recorded at the later moment;
and if the difference value is not 0, determining that the three-way valve is blocked.
7. The utility model provides a detecting system of fuel cell three-way valve which characterized in that is applicable to hydrogen fuel cell, hydrogen fuel cell includes hydrogen gas circuit, air circuit and water management way, the three-way valve is located on the water management way, be provided with temperature and pressure sensor on the water management way, the system includes:
a first determination unit for determining a current operating state of the hydrogen fuel cell engine, the operating state including a cold start state and a normal power generation state;
the first acquiring unit is used for acquiring a first temperature value of the cooling liquid of the reactor at a first preset time point when the hydrogen fuel cell engine is in the cold starting state;
the first judgment unit is used for judging whether the difference value between the first temperature value and the initial temperature value is smaller than a first preset temperature value or not;
the second determining unit is used for determining the clamping stagnation of the three-way valve if the difference value is smaller than the first preset temperature value;
the second judgment unit is used for judging whether a current second temperature value of the reactor coolant is greater than a second preset temperature value and whether the rotating speed of a cooling fan is greater than a preset rotating speed or not when the hydrogen fuel cell engine is in the normal power generation state, wherein the second preset temperature value is greater than the first preset temperature value;
a third judging unit, configured to judge whether a third temperature value of the reactor coolant is greater than a third preset temperature value at a second preset time point if the second temperature value is greater than the second preset temperature value and the rotation speed of the cooling fan is greater than the preset rotation speed;
and the third determining unit is used for determining the clamping stagnation of the three-way valve if the third temperature value is greater than the third preset temperature value.
8. The system of claim 7, wherein the first obtaining unit comprises:
the first acquiring subunit is used for acquiring the current temperature value of the reactor coolant as an initial temperature value when the hydrogen fuel cell engine is in the cold starting state and the first timer starts to count;
and the second acquiring subunit is configured to acquire a first temperature value of the reactor cooling liquid at a first preset time point when the timing time of the first timer reaches the first preset time point.
9. The system according to claim 7, wherein the third determining unit comprises:
the starting sub-unit is used for starting a second timer to time if the second temperature value is greater than the second preset temperature value and the rotating speed of the cooling fan is greater than the preset rotating speed;
the third acquiring subunit is configured to acquire a third temperature value of the current reactor coolant when the timing time of the second timer reaches a second preset time point;
and the judging subunit is used for judging whether the third temperature value is greater than a third preset temperature value.
10. The system of claim 7, further comprising:
a second obtaining unit, configured to obtain a current temperature value of the reactor coolant as an initial temperature value when the hydrogen fuel cell engine is in the cold start state;
the first storage unit is used for monitoring the temperature value of the reactor cooling liquid in real time based on the initial temperature value, recording the time length required by the temperature value of the reactor cooling liquid when the temperature value is increased by a preset temperature value, and storing the time length;
the first detection unit is used for detecting the number of the stored time lengths in real time;
the first calculating unit is used for calculating the average value of the stored time lengths when the number of the stored time lengths reaches a preset number;
a fourth determination unit for determining whether the three-way valve is stuck based on the average value.
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| CN114976149A (en) * | 2022-06-13 | 2022-08-30 | 中国第一汽车股份有限公司 | Control method and system of fuel cell engine thermal management system |
| CN115084594B (en) * | 2022-06-16 | 2024-03-12 | 塑云科技(深圳)有限公司 | Fuel cell diagnosis method and system based on knowledge graph |
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