CN113410493A - Automatic monitoring device for fuel cell engine drain valve and calibration method thereof - Google Patents
Automatic monitoring device for fuel cell engine drain valve and calibration method thereof Download PDFInfo
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- CN113410493A CN113410493A CN202110954927.9A CN202110954927A CN113410493A CN 113410493 A CN113410493 A CN 113410493A CN 202110954927 A CN202110954927 A CN 202110954927A CN 113410493 A CN113410493 A CN 113410493A
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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
- H01M8/04686—Failure or abnormal function of auxiliary devices, e.g. batteries, capacitors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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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- 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
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Abstract
The invention provides an automatic monitoring system for a drain valve of a fuel cell engine, belongs to the technical field of drain valves of fuel cell engines, and solves the problem that the existing drain valve calibration method cannot cope with the change of complex environmental factors. The device comprises data acquisition equipment, a controller and an actuating mechanism. After the data acquisition equipment acquires the hydrogen spraying parameters at the current moment, the controller identifies whether the state of the drain valve at the current moment is abnormal or not; if the water draining valve does not exist, judging that the water draining valve is normal; if the hydrogen injection valve exists, further analyzing the fluctuation quantity of the hydrogen injection parameter, and judging the state of the hydrogen discharge valve; if the hydrogen discharge valve is opened, when the fluctuation amount of the hydrogen spraying parameter is higher than a threshold value, judging that the drain valve discharges the gas, otherwise, judging that the drain valve is normal; if the hydrogen discharge valve is closed, when the fluctuation amount of the hydrogen spraying parameter is higher than a second threshold value, judging that the drain valve exhausts, otherwise, judging that the drain valve is normal; and finishing monitoring in normal time, and controlling an actuating mechanism to close the corresponding hydrogen discharge valve and the corresponding water discharge valve during gas discharge.
Description
Technical Field
The invention relates to the technical field of fuel cell engine drain valves, in particular to an automatic monitoring device for a fuel cell engine drain valve and a calibration method thereof.
Background
A fuel cell power generation system is a device that converts chemical energy generated by a chemical reaction into electrical energy. The energy conversion rate is 40% -60%, and the fuel cell has the characteristics of no pollution, environmental friendliness and the like, and hardly generates polluted gases such as nitric oxide, carbon monoxide and the like in the conversion process, so that the fuel cell is regarded as an energy power device with a good development prospect.
In the use of the fuel cell power generation system, the water in the hydrogen loop needs to be separated by the water separator and discharged by the water discharge valve, the calibration of the water discharge valve of the existing fuel cell engine is the calibration under the laboratory environment, the water discharge valve is more complex in the whole vehicle environment due to environmental factors, the external pressure change can influence the water discharge time of the water discharge valve, the overlong opening time of the water discharge valve can lead to the air discharge of the water discharge valve, and the performance of the engine is seriously influenced. Most of the existing calibration methods are used for calibrating the drain valve under fixed environmental factors, cannot cope with the change of complex environmental factors, and cannot avoid the phenomenon of gas exhaust of the drain valve.
At present, an automatic calibration method for a fuel cell engine drain valve is designed aiming at the phenomenon of gas exhaust of the drain valve.
Disclosure of Invention
The embodiment of the invention aims to provide an automatic monitoring device for a drain valve of a fuel cell engine and a calibration method thereof, which are used for solving the problem that the existing drain valve calibration method cannot cope with the change of complex environmental factors.
In one aspect, an embodiment of the present invention provides an automatic monitoring device for a drain valve of a fuel cell engine, including:
the data acquisition equipment is used for acquiring the hydrogen spraying parameters at the current moment and sending the parameters to the controller;
the controller is used for identifying whether the state of the drain valve at the current moment is possible to be abnormal or not according to the hydrogen spraying parameters; if the water draining valve does not exist, judging that the water draining valve is normal; if the hydrogen injection valve exists, further analyzing the fluctuation quantity of the hydrogen injection parameter, and judging the state of the hydrogen discharge valve; if the hydrogen discharge valve is opened, when the fluctuation quantity of the hydrogen spraying parameter is higher than a threshold value, judging that the water discharge valve discharges gas, and when the fluctuation quantity of the hydrogen spraying parameter is smaller than or equal to the threshold value, judging that the water discharge valve is normal; if the hydrogen discharge valve is closed, when the fluctuation amount of the hydrogen spraying parameter is higher than a second threshold value, judging that the water discharge valve discharges gas, and when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the second threshold value, judging that the water discharge valve is normal; and at the next moment when the drain valve is judged to be normal, finishing monitoring, and at the next moment when the drain valve is judged to be exhausted, controlling the actuating mechanism to close the corresponding hydrogen discharge valve and the corresponding drain valve;
and the actuating mechanism is used for closing the corresponding hydrogen discharge valve or the corresponding water discharge valve according to the control of the controller.
The beneficial effects of the above technical scheme are as follows: the state of the drain valve can be judged by monitoring the hydrogen spraying parameters, the drain valve can be timely responded when the exhaust condition occurs, the galvanic pile is prevented from being influenced greatly, automatic calibration can be carried out on the drain valve according to the current environment, and errors can be corrected timely.
Based on the further improvement of the system, the hydrogen injection parameters comprise the hydrogen injection duty ratio and the hydrogen injection inlet pressureP 0Pressure of hydrogen discharge portP 1Output current of the electric pileI。
The beneficial effects of the above further improved scheme are: the hydrogen spraying parameters are limited, and whether the state of the drain valve is normal or not can be accurately judged through the hydrogen spraying parameters, and the drain valve can be timely responded when the exhaust condition occurs.
Further, the data acquisition device further comprises:
gas pressure sensors respectively arranged at the hydrogen injection inlet and the hydrogen injection outlet of the fuel cell for collecting the pressure of the hydrogen injection inlet at the current momentP 0And hydrogen ejection port pressureP 1；
A current sensor arranged at the output end of the fuel cell stack for collecting the current output from the stack at the current momentI；
And the hydrogen spraying duty ratio sensor is used for acquiring the hydrogen spraying duty ratio of a hydrogen injector in the fuel cell when the opening time of the tail valve of the fuel cell reaches the preset time length.
The beneficial effects of the above further improved scheme are: the data acquisition equipment and the layout position are limited, and the hydrogen spraying duty ratio and the hydrogen spraying inlet pressure can be obtained through the sensorsP 0Pressure of hydrogen discharge portP 1Output current of the electric pileIAnd a solid foundation is laid for further accurately judging whether the state of the drain valve is normal or not and timely coping during air exhaust.
Further, the controller further comprises:
a data transceiver module for receiving hydrogen spray duty ratio and hydrogen spray inlet pressureP 0Pressure of hydrogen discharge portP 1Output current of the electric pileISending the data to a data analysis module;
the data analysis module is used for identifying whether the state of the drain valve at the current moment is abnormal or not according to the hydrogen spraying duty ratio at the current moment; if the water draining valve does not exist, judging that the water draining valve is normal; if so, further analyzing the pressure at the hydrogen injection inlet for a predetermined period of timeP 0Pressure of hydrogen discharge portP 1Output current of the electric pileIJudging whether the hydrogen exhaust valve is opened or not; if the hydrogen discharge valve is opened, when the fluctuation amount of the hydrogen spraying duty ratio in a preset time period is higher than a threshold value one, judging that the drain valve discharges gas, otherwise, judging that the drain valve is normal, when the fluctuation amount of the hydrogen spraying duty ratio in the preset time period is higher than a threshold value two, judging that the drain valve discharges gas, otherwise, judging that the drain valve is normal; sending the exhaust and normal results of the drain valve to a control module;
the control module is used for finishing the monitoring process at the next moment of the current moment after receiving the normal result of the drain valve; or after receiving the drainage result of the drainage valve, controlling the actuating mechanism to close the corresponding hydrogen discharge valve or the drainage valve at the next moment of the current moment.
The beneficial effects of the above further improved scheme are: the structure to the controller has been injectd, can be accurately open and the drainage state discernment to the drain valve through data analysis module, in case discern the drain valve exhaust, in time close corresponding hydrogen discharge valve or drain valve through control module.
Further, the data analysis module executes the following program to identify whether the state of the drain valve at the current moment is possible to be abnormal or not:
after the drain valve is opened, acquiring the hydrogen spraying duty ratio at the current moment;
comparing the hydrogen spraying duty ratio with an upper limit of the hydrogen spraying duty ratio allowed when the galvanic pile normally operates, and if the hydrogen spraying duty ratio is larger than or equal to the upper limit, judging that the state of the drain valve at the current moment is not abnormal and the state of the drain valve at the current moment is normal; otherwise, judging that the state of the drain valve at the current moment is possible to be abnormal.
The beneficial effects of the above further improved scheme are: whether the state of the drain valve is abnormal or not can be quickly identified through the hydrogen spraying duty ratio at the current moment. The method is simple and effective.
Further, when it is determined that there is a possibility of abnormality in the state of the drain valve at the present time, the data analysis module executes the following program to further determine whether the drain valve is normal or draining:
obtaining the pressure of the hydrogen jet inlet at the current momentP 0Pressure of hydrogen discharge portP 1Output current of the electric pileIAccording to saidP 0、P 1、IJudging whether the hydrogen exhaust valve is opened or not; if at the same time satisfyP 0≠0、P 1≠0、INot equal to 0, judging that the hydrogen exhaust valve is opened, otherwise, judging that the hydrogen exhaust valve is not opened;
after the hydrogen discharge valve is judged to be opened, further obtaining a hydrogen spraying duty ratio variation mean value in a preset time period before the current time, comparing the hydrogen spraying duty ratio variation mean value with a first threshold value, if the hydrogen spraying duty ratio variation mean value is higher than the first threshold value, judging that the water discharge valve exhausts, and if the hydrogen spraying duty ratio variation mean value is not higher than the first threshold value, judging that the water discharge valve is normal;
after the hydrogen discharge valve is judged to be closed, the hydrogen spraying duty ratio variation mean value in the preset time period before the current moment is further obtained, the hydrogen spraying duty ratio variation mean value is compared with a second threshold value, if the hydrogen spraying duty ratio variation mean value is higher than the second threshold value, the water discharge valve is judged to be discharged, and if the hydrogen spraying duty ratio variation mean value is not higher than the second threshold value, the water discharge valve is judged to be normal.
The beneficial effects of the above further improved scheme are: a procedure for further determining whether the drain valve is normal or draining is defined. First, byP 0、P 1、IWhether the hydrogen discharge valve is opened or not can be judged, and then whether the drain valve exhausts or not is further judged according to the hydrogen spraying duty ratio variation mean value in the preset time period before the current moment in different states of the hydrogen discharge valve. The method is simple and effective.
Further, the data analysis module executes the following program:
after it is determined that the drain valve is exhausting, a warning is issued to the user that the drain valve is exhausting during operation of the engine.
The beneficial effects of the above further improved scheme are: after the exhaust of the drain valve is detected, a warning or a prompt is sent to a user, so that the user can replace the corresponding drain valve in time.
Further, the automatic monitoring device for the drain valve of the fuel cell engine also comprises a hydrogen discharge valve leakage detection device and a drain valve leakage detection device; the output ends of the hydrogen discharge valve leakage detection device and the drain valve leakage detection device are respectively connected with the input end of the controller;
electrodes of the hydrogen discharge valve leakage detection device are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines, and are used for monitoring whether leakage occurs at each position on the hydrogen discharge valve at the previous moment when the controller identifies whether the state of the water discharge valve at the current moment is abnormal or not and sending the monitoring result to the controller;
electrodes of the drain valve leakage detection device are uniformly distributed on the surface of the drain valve and the front and rear connecting pipelines, and the drain valve leakage detection device is used for monitoring whether leakage occurs at each position on the drain valve at the previous moment when the controller identifies whether the state of the drain valve at the current moment is abnormal or not, and sending a monitoring result to the controller.
The beneficial effects of the above further improved scheme are: the leakage detection device for the hydrogen discharge valve and the leakage detection device for the water discharge valve are added, before the state of the water discharge valve is detected, the leakage states of the water discharge valve, the surface of the hydrogen discharge valve and the front and back connecting pipelines are detected firstly, the influence of the leakage of the water discharge valve, the surface of the hydrogen discharge valve and the front and back connecting pipelines on subsequent detection results is eliminated, and the accuracy of detection is improved.
Further, the leakage detection device for the hydrogen discharge valve further comprises: the system comprises a first distributed pressure sensor, a first control unit and a first output unit; the first distributed pressure sensors are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines; and the number of the first and second electrodes,
the drain valve leakage detection device further comprises: a second distributed pressure sensor, a second control unit and a second output unit; the second distributed pressure sensors are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines;
the first control unit is used for judging whether the hydrogen exhaust valve leaks or not according to the surface of the hydrogen exhaust valve and the pressure of a plurality of positions on the front connecting pipeline and the rear connecting pipeline;
and the second control unit is used for judging whether the drain valve leaks or not according to the surface of the drain valve and the pressure of a plurality of positions on the front and rear connecting pipelines.
The beneficial effects of the above further improved scheme are: the structures of the hydrogen discharge valve leakage detection device and the drain valve leakage detection device are defined. The first distributed pressure sensor and the second distributed pressure sensor can adopt the same arrangement mode, the first output unit and the second output unit can adopt the same existing output module, and the first control unit and the second control unit can adopt the same controller.
In another aspect, an embodiment of the present invention provides a method for calibrating a state of a drain valve of a fuel cell engine, including the following steps:
acquiring hydrogen spraying parameters at the current moment;
identifying whether the state of the drain valve at the current moment is abnormal or not according to the hydrogen spraying parameters; if the drainage valve does not exist, judging that the drainage valve is normal, and finishing monitoring; if so, executing the next step;
analyzing the change of the hydrogen spraying parameters to judge the state of the hydrogen exhaust valve; if the hydrogen discharge valve is opened, when the fluctuation amount of the hydrogen spraying parameter is higher than a threshold value, judging that the drain valve exhausts, closing the corresponding hydrogen discharge valve and the drain valve, when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the threshold value, judging that the drain valve is normal, and finishing monitoring; if the hydrogen discharge valve is closed, when the fluctuation amount of the hydrogen spraying parameter is higher than the second threshold value, judging that the drain valve exhausts, closing the corresponding drain valve, when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the second threshold value, judging that the drain valve is normal, and finishing monitoring.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
Drawings
The foregoing and other objects, features and advantages of the disclosure will be apparent from the following more particular descriptions of exemplary embodiments of the disclosure as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the disclosure.
Fig. 1 shows a schematic structural view of an automatic monitoring device for a drain valve according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram showing an automatic monitoring device for a drain valve according to embodiment 2 of the present invention;
fig. 3 is a schematic view showing the principle of an automatic monitoring device for a drain valve according to embodiment 2 of the present invention;
fig. 4 is a schematic view showing an example of the automatic monitoring device for the drain valve according to embodiment 2 of the present invention.
Reference numerals:
d, hydrogen spraying duty ratio at the current moment;
d0-the upper limit value of the allowable hydrogen injection duty ratio when the galvanic pile normally operates can be obtained according to the design value of hydrogen injection or the measured value of an engine rack;
d1-is the upper limit value of the hydrogen spraying duty ratio allowed in the stack exhaust process;
t0, calculating a pressure ratio according to the pressure value detected by the current environment pressure sensor and the optimal pressure value of the hydrogen cavity under the current working condition, obtaining the flow rate according to the corresponding drain valve characteristic curve, and then combining the flow rate with the maximum water storage capacity of the water separator to calculate the time required for emptying the water separator;
t-recording time;
c-the drain valve opening period;
a-a cycle time value which is set according to the water yield of the galvanic pile at the working condition point and needs to be increased when the exhaust condition of the drain valve occurs.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object. Other explicit and implicit definitions are also possible below.
Example 1
An embodiment of the present invention discloses an automatic monitoring device for a drain valve of a fuel cell engine, as shown in fig. 1, which comprises a data acquisition device, a controller and an execution mechanism, which are connected in sequence.
And the data acquisition equipment is used for acquiring the hydrogen spraying parameters at the current moment and sending the parameters to the controller. In particular, there is more than one data acquisition device. The hydrogen injection parameter may take one or more of all variables related to the state of the drain valve.
The controller is used for identifying whether the state of the drain valve at the current moment is possible to be abnormal or not according to the hydrogen spraying parameters; if the water draining valve does not exist, judging that the water draining valve is normal; if the hydrogen injection valve exists, further analyzing the fluctuation quantity of the hydrogen injection parameter, and judging the state of the hydrogen discharge valve; if the hydrogen discharge valve is opened, when the fluctuation quantity of the hydrogen spraying parameter is higher than a threshold value, judging that the water discharge valve discharges gas, and when the fluctuation quantity of the hydrogen spraying parameter is smaller than or equal to the threshold value, judging that the water discharge valve is normal; if the hydrogen discharge valve is closed, when the fluctuation amount of the hydrogen spraying parameter is higher than a second threshold value, judging that the water discharge valve discharges gas, and when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the second threshold value, judging that the water discharge valve is normal; and finishing monitoring at the next moment when the drain valve is judged to be normal, and controlling the actuating mechanism to close the corresponding hydrogen discharge valve and the drain valve at the next moment when the drain valve is judged to be exhausted.
And the actuating mechanism is used for closing the corresponding hydrogen discharge valve or the corresponding water discharge valve according to the control of the controller.
When the method is implemented, in the opening process of the drain valve, if the fluctuation quantity of the hydrogen spraying parameter is within a normal range, the state of the drain valve is normal; if the fluctuation amount of the hydrogen injection parameter is higher than the normal operation range, judging the state of the hydrogen discharge valve, and if the fluctuation amount of the hydrogen injection parameter is beyond the normal range in the unopened state of the hydrogen discharge valve, judging that the water discharge valve exhausts, otherwise, judging that the water discharge valve is normal; and when the fluctuation amount of the hydrogen spraying parameter exceeds the normal range in the opening state of the hydrogen discharge valve, judging that the water discharge valve discharges the gas, otherwise, judging that the water discharge valve is normal.
Compared with the prior art, the device that this embodiment provided can be through spouting parameter monitoring to hydrogen and judging the drain valve state, in time deal with when the exhaust condition appears in the drain valve, avoid causing bigger influence to the pile to can carry out automatic calibration, in time revise the error to the current environment to the drain valve. The drain valve can be corrected (replaced) in time when the exhaust condition occurs in the running process of the engine, and the further attenuation of the performance of the engine is avoided.
Example 2
The optimization is carried out on the basis of the embodiment 1, and the hydrogen injection parameters comprise the hydrogen injection duty ratio (the duty ratio of a PWM signal) and the hydrogen injection inlet pressureP 0Pressure of hydrogen discharge portP 1Output current of the electric pileI. Other combinations of variables related to the state of the drain valve may be used by the user, as will be appreciated by those skilled in the art, and will not be described in detail herein.
Preferably, the data acquisition device further comprises a gas pressure sensor, a current sensor, and a hydrogen injection duty ratio sensor, as shown in fig. 2. Alternatively, other devices can be used to measure the hydrogen injection duty cycle and the hydrogen injection inlet pressureP 0Pressure of hydrogen discharge portP 1Output current of the electric pileI。
Gas pressure sensors respectively arranged at the hydrogen injection inlet and the hydrogen injection outlet of the fuel cell for collecting the pressure of the hydrogen injection inlet at the current momentP 0And hydrogen ejection port pressureP 1. More than one gas pressure sensor.
A current sensor arranged at the power supply output end of the fuel cell stack and used for collecting the current output by the stack at the current momentI. The current sensor is connected in series with the electrical load as shown in figure 3.
And the hydrogen spraying duty ratio sensor is used for acquiring the hydrogen spraying duty ratio of a hydrogen injector in the fuel cell when the opening time of the tail valve of the fuel cell reaches the preset time length. The hydrogen spray duty cycle, i.e., the duty cycle of the PWM signal. For example, a hydrogen injection duty cycle sensor can be found in patent CN 202010964398.6. Alternatively, the hydrogen injection duty cycle sensor may be replaced with other devices that measure the hydrogen injection duty cycle. The hydrogen spraying duty ratio sensor is arranged at the tail part of the hydrogen sprayer.
Preferably, the controller further comprises a data transceiver module, a data analysis module and a control module which are connected in sequence.
A data transceiver module for receiving hydrogen spray duty ratio and hydrogen spray inlet pressureP 0Pressure of hydrogen discharge portP 1Output current of the electric pileISending outTo the data analysis module.
The data analysis module is used for identifying whether the state of the drain valve at the current moment is abnormal or not according to the hydrogen spraying duty ratio at the current moment; if the water draining valve does not exist, judging that the water draining valve is normal; if so, further analyzing the pressure at the hydrogen injection inlet for a predetermined period of timeP 0Pressure of hydrogen discharge portP 1Output current of the electric pileIJudging whether the hydrogen exhaust valve is opened or not; if the hydrogen discharge valve is opened, when the fluctuation amount of the hydrogen spraying duty ratio in a preset time period is higher than a threshold value one, judging that the drain valve discharges gas, otherwise, judging that the drain valve is normal, when the fluctuation amount of the hydrogen spraying duty ratio in the preset time period is higher than a threshold value two, judging that the drain valve discharges gas, otherwise, judging that the drain valve is normal; and sending the exhaust and normal results of the drain valve to a control module.
Preferably, the data analysis module is provided with a display screen, and the display screen displays the pressure of the tail part of the hydrogen spraying device, the drain valve and the surface of the hydrogen discharge valve at the current moment, the hydrogen spraying duty ratio and the output current of the fuel cell.
The control module is used for finishing the monitoring process at the next moment of the current moment after receiving the normal result of the drain valve; or after receiving the drainage result of the drainage valve, controlling the actuating mechanism to close the corresponding hydrogen discharge valve or the drainage valve at the next moment of the current moment.
Preferably, the data analysis module executes the following program to identify whether there is a possibility of abnormality in the state of the drain valve at the present time:
s21, after the drain valve is opened, the hydrogen spraying duty ratio at the current moment is obtained;
s22, comparing the hydrogen spraying duty ratio with the upper limit of the hydrogen spraying duty ratio allowed by the normal operation of the galvanic pile, if the hydrogen spraying duty ratio is more than or equal to the upper limit, judging that the state of the drain valve at the current moment is not possible to be abnormal, and the state of the drain valve at the current moment is normal; otherwise, judging that the state of the drain valve at the current moment is possible to be abnormal.
Preferably, when it is determined that there is a possibility of abnormality in the state of the drain valve at the present time, the data analysis module executes the following routine to further determine whether the drain valve is normal or draining:
s31, acquiring the pressure of the hydrogen jet inlet at the current momentP 0Pressure of hydrogen discharge portP 1Output current of the electric pileIAccording to saidP 0、P 1、IJudging whether the hydrogen exhaust valve is opened or not; if at the same time satisfyP 0≠0、P 1≠0、INot equal to 0, judging that the hydrogen exhaust valve is opened, and executing step S32, otherwise, judging that the hydrogen exhaust valve is not opened, and executing step S33;
s32, after the hydrogen discharge valve is judged to be opened, further obtaining a hydrogen spraying duty ratio variation mean value in a preset time period before the current time, comparing the hydrogen spraying duty ratio variation mean value with a first threshold value, if the hydrogen spraying duty ratio variation mean value is higher than the first threshold value, judging that the water discharge valve exhausts, and if the hydrogen spraying duty ratio variation mean value is not higher than the first threshold value, judging that the water discharge valve is normal;
s33, after the hydrogen discharge valve is judged to be closed, the hydrogen spraying duty ratio variation mean value in the preset time period before the current time is further obtained, the hydrogen spraying duty ratio variation mean value is compared with a second threshold value, if the hydrogen spraying duty ratio variation mean value is higher than the second threshold value, the water discharge valve is judged to be discharged, and if the hydrogen spraying duty ratio variation mean value is not higher than the second threshold value, the water discharge valve is judged to be normal.
A specific example of the controller executing the program may refer to fig. 4.
Preferably, the data analysis module further executes the following program:
s34, after determining that the drain valve is vented, a warning is given to the user that the drain valve is vented during engine operation.
Preferably, the automatic monitoring device for the drain valve further comprises a hydrogen discharge valve leakage detection device and a drain valve leakage detection device; the output ends of the hydrogen discharge valve leakage detection device and the drain valve leakage detection device are respectively connected with the input end of the controller.
The electrode of the hydrogen discharge valve leakage detection device is uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines, and is used for monitoring whether leakage occurs at each position on the hydrogen discharge valve at the previous moment (before step S21) when the controller identifies whether the state of the water discharge valve at the current moment is abnormal or not, and sending the monitoring result to the controller.
And electrodes of the drain valve leakage detection device are uniformly distributed on the surface of the drain valve and the front and rear connecting pipelines, and are used for monitoring whether leakage occurs at each position on the drain valve at the previous moment (namely before step S21) when the controller identifies whether the state of the drain valve at the current moment is abnormal or not, and sending the monitoring result to the controller.
Preferably, the hydrogen discharge valve leakage detecting apparatus further comprises: the system comprises a first distributed pressure sensor, a first control unit and a first output unit. The first distributed pressure sensors are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines. And the first control unit is used for judging whether the hydrogen exhaust valve leaks or not according to the surface of the hydrogen exhaust valve and the pressure of a plurality of positions on the front connecting pipeline and the rear connecting pipeline. In particular, if the pressure at any one location is significantly higher than the pressure at other locations around, a leakage phenomenon occurs at that point.
The drain valve leakage detection device further comprises: a second distributed pressure sensor, a second control unit and a second output unit. The second distributed pressure sensors are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines. And the control unit II is used for judging whether the drain valve leaks or not according to the surface of the drain valve and the pressure of a plurality of positions on the front and rear connecting pipelines. In particular, if the pressure at any one location is significantly higher than the pressure at other locations around, a leakage phenomenon occurs at that point.
Specifically, after the controller obtains the leakage-free results of the hydrogen discharge valve leakage detection device and the drain valve leakage detection device, the controller starts to execute step S21, otherwise, the corresponding hydrogen discharge valve or the drain valve and the connecting pipeline are replaced first until no leakage occurs.
Preferably, the actuating mechanism further comprises a first electromagnetic valve and a second electromagnetic valve which are arranged at the front ends of the drain valve and the hydrogen discharge valve, and a third electromagnetic valve and a fourth electromagnetic valve which are arranged at the rear ends of the drain valve and the hydrogen discharge valve.
The input end of the first electromagnetic valve is connected with the drainage output end of the water distributor, and the output end of the first electromagnetic valve is connected with the input end of the drainage valve.
The input end of the second electromagnetic valve is connected with the air output end of the water separator, and the output end of the second electromagnetic valve is connected with the input end of the hydrogen discharge valve.
The input end of the electromagnetic valve III is connected with the output end of the drain valve, and the output end of the electromagnetic valve III is connected with the mixed drainage pipeline.
The input end of the electromagnetic valve IV is connected with the output end of the hydrogen discharge valve, and the output end of the electromagnetic valve IV is connected with the mixed discharge pipeline.
Compared with the embodiment 1, the device provided by the embodiment judges whether the drain valve exhausts or not by the hydrogen spraying duty ratio of the engine, and realizes automatic calibration of the drain valve aiming at the current environment. When the exhaust condition appears in the drain valve, the drain valve can be responded to in time, and the galvanic pile is prevented from being influenced greatly.
Example 3
An embodiment of the present invention further provides a method for calibrating a state of a drain valve of a fuel cell engine corresponding to the apparatus described in embodiment 1 or 2, including the following steps:
s1, acquiring hydrogen spraying parameters at the current moment;
s2, identifying whether the state of the drain valve at the current time is abnormal or not according to the hydrogen spraying parameters; if the drainage valve does not exist, judging that the drainage valve is normal, and finishing monitoring; if so, executing the next step;
s3, analyzing the change of the hydrogen spraying parameters to judge the state of the hydrogen discharging valve; if the hydrogen discharge valve is opened, when the fluctuation amount of the hydrogen spraying parameter is higher than a threshold value, judging that the drain valve exhausts, closing the corresponding hydrogen discharge valve and the drain valve, when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the threshold value, judging that the drain valve is normal, and finishing monitoring; if the hydrogen discharge valve is closed, when the fluctuation amount of the hydrogen spraying parameter is higher than the second threshold value, judging that the drain valve exhausts, closing the corresponding drain valve, when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the second threshold value, judging that the drain valve is normal, and finishing monitoring.
Those skilled in the art will appreciate that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium, to instruct related hardware. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, the practical application, or improvements made to the prior art, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. An automatic monitoring device for a drain valve of a fuel cell engine, comprising:
the data acquisition equipment is used for acquiring the hydrogen spraying parameters at the current moment and sending the parameters to the controller;
the controller is used for identifying whether the state of the drain valve at the current moment is possible to be abnormal or not according to the hydrogen spraying parameters; if the water draining valve does not exist, judging that the water draining valve is normal; if the hydrogen injection valve exists, further analyzing the fluctuation quantity of the hydrogen injection parameter, and judging the state of the hydrogen discharge valve; if the hydrogen discharge valve is opened, when the fluctuation quantity of the hydrogen spraying parameter is higher than a threshold value, judging that the water discharge valve discharges gas, and when the fluctuation quantity of the hydrogen spraying parameter is smaller than or equal to the threshold value, judging that the water discharge valve is normal; if the hydrogen discharge valve is closed, when the fluctuation amount of the hydrogen spraying parameter is higher than a second threshold value, judging that the water discharge valve discharges gas, and when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the second threshold value, judging that the water discharge valve is normal; and at the next moment when the drain valve is judged to be normal, finishing monitoring, and at the next moment when the drain valve is judged to be exhausted, controlling the actuating mechanism to close the corresponding hydrogen discharge valve and the corresponding drain valve;
and the actuating mechanism is used for closing the corresponding hydrogen discharge valve or the corresponding water discharge valve according to the control of the controller.
2. The automatic monitoring device for a drain valve of a fuel cell engine of claim 1, wherein the hydrogen injection parameters comprise a hydrogen injection duty cycle, a hydrogen injection inlet pressureP 0Pressure of hydrogen discharge portP 1Output of the electric pileElectric currentI。
3. The automatic monitoring device for a drain valve of a fuel cell engine according to claim 1 or 2, wherein the data collecting apparatus further comprises:
gas pressure sensors respectively arranged at the hydrogen injection inlet and the hydrogen injection outlet of the fuel cell for collecting the pressure of the hydrogen injection inlet at the current momentP 0And hydrogen ejection port pressureP 1；
A current sensor arranged at the output end of the fuel cell stack for collecting the current output from the stack at the current momentI；
And the hydrogen spraying duty ratio sensor is used for acquiring the hydrogen spraying duty ratio of a hydrogen injector in the fuel cell when the opening time of the tail valve of the fuel cell reaches the preset time length.
4. The automatic monitoring device for a drain valve of a fuel cell engine according to claim 3, wherein the controller further comprises, connected in series:
a data transceiver module for receiving hydrogen spray duty ratio and hydrogen spray inlet pressureP 0Pressure of hydrogen discharge portP 1Output current of the electric pileISending the data to a data analysis module;
the data analysis module is used for identifying whether the state of the drain valve at the current moment is abnormal or not according to the hydrogen spraying duty ratio at the current moment; if the water draining valve does not exist, judging that the water draining valve is normal; if so, further analyzing the pressure at the hydrogen injection inlet for a predetermined period of timeP 0Pressure of hydrogen discharge portP 1Output current of the electric pileIJudging whether the hydrogen exhaust valve is opened or not; if the hydrogen discharge valve is opened, when the fluctuation amount of the hydrogen spraying duty ratio in a preset time period is higher than a threshold value one, judging that the drain valve discharges gas, otherwise, judging that the drain valve is normal, when the fluctuation amount of the hydrogen spraying duty ratio in the preset time period is higher than a threshold value two, judging that the drain valve discharges gas, otherwise, judging that the drain valve is normal; sending the exhaust and normal results of the drain valve to a control module;
the control module is used for finishing the monitoring process at the next moment of the current moment after receiving the normal result of the drain valve; or after receiving the drainage result of the drainage valve, controlling the actuating mechanism to close the corresponding hydrogen discharge valve or the drainage valve at the next moment of the current moment.
5. The automatic monitoring apparatus for a water discharge valve of a fuel cell engine according to claim 4, wherein the data analysis module executes the following program to recognize whether there is a possibility of abnormality in the state of the water discharge valve at the present time:
after the drain valve is opened, acquiring the hydrogen spraying duty ratio at the current moment;
comparing the hydrogen spraying duty ratio with an upper limit of the hydrogen spraying duty ratio allowed when the galvanic pile normally operates, and if the hydrogen spraying duty ratio is larger than or equal to the upper limit, judging that the state of the drain valve at the current moment is not abnormal and the state of the drain valve at the current moment is normal; otherwise, judging that the state of the drain valve at the current moment is possible to be abnormal.
6. The automatic monitoring apparatus for a water discharge valve of a fuel cell engine according to claim 4 or 5, wherein when it is determined that there is a possibility of abnormality in the state of the water discharge valve at the present time, the data analysis module executes a routine for further determining whether the water discharge valve is normal or discharging water;
obtaining the pressure of the hydrogen jet inlet at the current momentP 0Pressure of hydrogen discharge portP 1Output current of the electric pileIAccording to saidP 0、P 1、IJudging whether the hydrogen exhaust valve is opened or not; if at the same time satisfyP 0≠0、P 1≠0、INot equal to 0, judging that the hydrogen exhaust valve is opened, otherwise, judging that the hydrogen exhaust valve is not opened;
after the hydrogen discharge valve is judged to be opened, further obtaining a hydrogen spraying duty ratio variation mean value in a preset time period before the current time, comparing the hydrogen spraying duty ratio variation mean value with a first threshold value, if the hydrogen spraying duty ratio variation mean value is higher than the first threshold value, judging that the water discharge valve exhausts, and if the hydrogen spraying duty ratio variation mean value is not higher than the first threshold value, judging that the water discharge valve is normal;
after the hydrogen discharge valve is judged to be closed, the hydrogen spraying duty ratio variation mean value in the preset time period before the current moment is further obtained, the hydrogen spraying duty ratio variation mean value is compared with a second threshold value, if the hydrogen spraying duty ratio variation mean value is higher than the second threshold value, the water discharge valve is judged to be discharged, and if the hydrogen spraying duty ratio variation mean value is not higher than the second threshold value, the water discharge valve is judged to be normal.
7. The automatic monitoring device for a drain valve of a fuel cell engine according to claim 6, wherein said data analysis module further executes the following program:
after it is determined that the drain valve is exhausting, a warning is issued to the user that the drain valve is exhausting during operation of the engine.
8. The automatic monitoring device for a drain valve of a fuel cell engine according to any one of claims 1 to 2, 4 to 5, and 7, further comprising a hydrogen discharge valve leakage detecting means and a drain valve leakage detecting means; the output ends of the hydrogen discharge valve leakage detection device and the drain valve leakage detection device are respectively connected with the input end of the controller;
electrodes of the hydrogen discharge valve leakage detection device are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines, and are used for monitoring whether leakage occurs at each position on the hydrogen discharge valve at the previous moment when the controller identifies whether the state of the water discharge valve at the current moment is abnormal or not and sending the monitoring result to the controller;
electrodes of the drain valve leakage detection device are uniformly distributed on the surface of the drain valve and the front and rear connecting pipelines, and the drain valve leakage detection device is used for monitoring whether leakage occurs at each position on the drain valve at the previous moment when the controller identifies whether the state of the drain valve at the current moment is abnormal or not, and sending a monitoring result to the controller.
9. The automatic monitoring device for a water discharge valve of a fuel cell engine according to claim 8, wherein the hydrogen discharge valve leakage detecting means further comprises, connected in sequence: the system comprises a first distributed pressure sensor, a first control unit and a first output unit; the first distributed pressure sensors are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines; and the number of the first and second electrodes,
the drain valve leakage detection device further comprises: a second distributed pressure sensor, a second control unit and a second output unit; the second distributed pressure sensors are uniformly distributed on the surface of the hydrogen discharge valve and the front and rear connecting pipelines;
the first control unit is used for judging whether the hydrogen exhaust valve leaks or not according to the surface of the hydrogen exhaust valve and the pressure of a plurality of positions on the front connecting pipeline and the rear connecting pipeline;
and the second control unit is used for judging whether the drain valve leaks or not according to the surface of the drain valve and the pressure of a plurality of positions on the front and rear connecting pipelines.
10. A method for calibrating the state of a drain valve of a fuel cell is characterized by comprising the following steps:
acquiring hydrogen spraying parameters at the current moment;
identifying whether the state of the drain valve at the current moment is abnormal or not according to the hydrogen spraying parameters; if the drainage valve does not exist, judging that the drainage valve is normal, and finishing monitoring; if so, executing the next step;
analyzing the change of the hydrogen spraying parameters to judge the state of the hydrogen exhaust valve; if the hydrogen discharge valve is opened, when the fluctuation amount of the hydrogen spraying parameter is higher than a threshold value, judging that the drain valve exhausts, closing the corresponding hydrogen discharge valve and the drain valve, when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the threshold value, judging that the drain valve is normal, and finishing monitoring; if the hydrogen discharge valve is closed, when the fluctuation amount of the hydrogen spraying parameter is higher than the second threshold value, judging that the drain valve exhausts, closing the corresponding drain valve, when the fluctuation amount of the hydrogen spraying parameter is smaller than or equal to the second threshold value, judging that the drain valve is normal, and finishing monitoring.
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