CN110082688B - A kind of method for testing performance and device of fuel cell - Google Patents
A kind of method for testing performance and device of fuel cell Download PDFInfo
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- CN110082688B CN110082688B CN201910556417.9A CN201910556417A CN110082688B CN 110082688 B CN110082688 B CN 110082688B CN 201910556417 A CN201910556417 A CN 201910556417A CN 110082688 B CN110082688 B CN 110082688B
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- 239000000446 fuel Substances 0.000 title claims abstract description 128
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000010248 power generation Methods 0.000 claims abstract description 14
- 238000005070 sampling Methods 0.000 claims description 138
- 230000008859 change Effects 0.000 claims description 23
- 230000010287 polarization Effects 0.000 claims description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 230000008569 process Effects 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
Under steady state operating conditions whether the invention discloses a kind of method for testing performance of fuel cell, comprising: when detecting that fuel cell enters power generation mode, judge the fuel cell；If so, determining average voltage level corresponding with each target current sampled point and acquisition target voltage values corresponding with each target current sampled point；For each target current sampled point, judge whether the difference of corresponding average voltage level and target voltage values is greater than preset first difference value threshold value；When the ratio for being greater than the total quantity of quantity and each target current sampled point of preset first difference value threshold value is greater than preset first proportion threshold value, determine that the fuel battery performance is unsatisfactory for requiring.The above process provides a kind of method for testing performance of fuel cell, does not need additionally to increase detection device in the detection process, so that it may realize the detection to fuel battery performance.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a method and a device for detecting the performance of a fuel cell.
Background
A fuel cell is a chemical device that directly converts chemical energy of fuel into electrical energy, and is also called an electrochemical generator. Fuel cells have been used in the automotive industry, energy generation, marine industry, aerospace, household power, and the like.
Taking a fuel cell engine system as an example, the performance of a fuel cell is a key index, and the fuel cell engine mostly works under several working conditions in the actual use process, so that the requirement on the steady-state performance is higher. When the fuel cell is aged, the efficiency is reduced, the performance of a fuel cell engine is inevitably reduced, and the customer experience and even the life safety are affected.
There is a lack of a method of detecting fuel cell performance that indicates when the steady state performance of the fuel cell engine is degraded.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for detecting performance of a fuel cell, which are used to solve the problems of system performance degradation, influence on customer experience and even life safety caused by lack of a method for detecting performance of a fuel cell, and the specific scheme is as follows:
a method of detecting performance of a fuel cell, comprising:
when detecting that the fuel cell enters a power generation mode, judging whether the fuel cell is under a steady-state working condition;
if so, determining an average voltage value corresponding to each target current sampling point and acquiring a target voltage value corresponding to each target current sampling point;
judging whether the difference value between the average voltage value corresponding to each target current sampling point and the target voltage value is greater than a preset first difference value threshold value or not according to each target current sampling point;
and when the ratio of the number of the sampling points which is greater than the preset first difference value threshold to the total number of the sampling points of the target current is greater than a preset first proportional threshold, judging that the performance of the fuel cell does not meet the requirement.
The above method, optionally, further includes:
and when the ratio of the number of the sampling points which is greater than the preset first difference value threshold to the total number of the sampling points of each target current is smaller than a preset first proportional threshold, judging that the performance of the fuel cell meets the requirement.
The method described above, optionally, when it is detected that the fuel cell enters the power generation mode, determining whether the fuel cell is in the steady-state operating condition, includes:
detecting whether the required power of the fuel cell fluctuates in a preset first range;
detecting whether the flow change of an air path of the fuel cell fluctuates within a preset second range;
detecting whether the flow change of the hydrogen gas path of the fuel cell fluctuates within a preset third range;
detecting whether the current change of each target current sampling point of the fuel cell fluctuates within a preset fourth range.
Optionally, the method for determining an average voltage value corresponding to each target current sampling point and obtaining a target voltage value corresponding to each target current sampling point includes:
determining an average voltage value according to each single-point voltage value corresponding to each current sampling point;
comparing each single-point voltage value with the corresponding average voltage value, and discarding the single-point voltage value of which the difference value is greater than a preset second difference threshold value;
for each current sampling point, when the ratio of the number of the unreleased single-point voltage values to the total number of the single-point voltages is greater than a preset second ratio threshold value, taking the total number of the single-point voltages as a target current sampling point;
and acquiring target voltage values corresponding to the target current sampling points in a standard polarization curve corresponding to the fuel cell.
The above method, optionally, determining, for each current sampling point, an average voltage value corresponding to the current sampling point, includes:
setting sampling windows at the left end and the right end adjacent to each current sampling point respectively;
selecting each single-point voltage value in the sampling window;
and calculating the average voltage value of the single-point voltage values.
A performance detection device of a fuel cell, comprising:
the first judgment module is used for judging whether the fuel cell is under a steady-state working condition or not when the fuel cell is detected to enter a power generation mode;
the determination acquisition module is used for determining the average voltage value corresponding to each target current sampling point and acquiring the target voltage value corresponding to each target current sampling point if the target voltage value is equal to the average voltage value;
the second judgment module is used for judging whether the difference value between the average voltage value and the target voltage value corresponding to each target current sampling point is greater than a preset first difference value threshold value or not;
and the first judging module is used for judging that the performance of the fuel cell does not meet the requirement when the ratio of the number of the sampling points which is greater than a preset first difference value threshold value to the total number of the sampling points of the target current is greater than a preset first proportional threshold value.
The above apparatus, optionally, further comprises:
and the second determination module is used for determining that the performance of the fuel cell meets the requirement when the ratio of the number larger than the preset first difference value threshold to the total number of the target current sampling points is smaller than a preset first proportional threshold.
In the foregoing apparatus, optionally, the first determining module includes:
a first detection unit for detecting whether a required power of the fuel cell fluctuates within a preset first range;
the second detection unit is used for detecting whether the flow change of the air path of the fuel cell fluctuates within a preset second range or not;
the third detection unit is used for detecting whether the flow change of the hydrogen gas path of the fuel cell fluctuates within a preset third range or not;
and the fourth detection unit is used for detecting whether the current change of each target current sampling point of the fuel cell fluctuates within a preset fourth range.
The above apparatus, optionally, the determining and acquiring module includes:
the first determining unit is used for determining an average voltage value according to each single-point voltage value corresponding to each current sampling point;
the comparison and rejection unit is used for comparing each single-point voltage value with the corresponding average voltage value and rejecting the single-point voltage value of which the difference value is greater than a preset second difference threshold value;
the second determining unit is used for regarding each current sampling point, and when the ratio of the number of the unreleased single-point voltage values to the total number of the single-point voltages is larger than a preset second ratio threshold value, the current sampling point is taken as a target current sampling point;
and the acquisition unit is used for acquiring target voltage values corresponding to the target current sampling points in a standard polarization curve corresponding to the fuel cell.
In the above apparatus, optionally, the first determining unit includes:
setting a stator unit, which is used for setting sampling windows at the left end and the right end adjacent to each current sampling point respectively;
the selecting subunit is used for selecting each single-point voltage value in the sampling window;
and the calculating subunit is used for calculating the average voltage value of each single-point voltage value.
Compared with the prior art, the invention has the following advantages:
the invention discloses a performance detection method of a fuel cell, which comprises the following steps: when detecting that the fuel cell enters a power generation mode, judging whether the fuel cell is under a steady-state working condition; if so, determining an average voltage value corresponding to each target current sampling point and acquiring a target voltage value corresponding to each target current sampling point; judging whether the difference value between the average voltage value corresponding to each target current sampling point and the target voltage value is greater than a preset first difference value threshold value or not according to each target current sampling point; and when the ratio of the number of the sampling points which is greater than the preset first difference value threshold to the total number of the sampling points of the target current is greater than a preset first proportional threshold, judging that the performance of the fuel cell does not meet the requirement. The process provides a performance detection method of the fuel cell, and detection of the performance of the fuel cell can be realized without additionally adding detection equipment in the detection process.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for detecting performance of a fuel cell according to an embodiment of the present disclosure;
FIG. 2 is a diagram of a standard polarization curve and a degraded polarization curve of a fuel cell according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of another method of detecting performance of a fuel cell according to an embodiment of the present disclosure;
fig. 4 is a schematic view of a current sampling point acquisition window disclosed in the embodiment of the present application;
fig. 5 is a block diagram of a structure of a performance detection apparatus for a fuel cell according to an embodiment of the present application.
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.
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.
The invention provides a method and a device for detecting the performance of a fuel cell, which are applied to the detection process of the performance of the fuel cell. The execution flow of the detection method is shown in fig. 1, and comprises the following steps:
s101, when the fuel cell is detected to enter a power generation mode, judging whether the fuel cell is in a steady-state working condition;
the method comprises the steps of detecting the required power of a fuel cell, judging that the fuel cell enters a power generation mode when the required power reaches a preset power threshold value, otherwise, continuously detecting the fuel cell, obtaining the required power of the fuel cell, the flow change of an air path, the flow change of a hydrogen path and the current change of a target current sampling point after the fuel cell enters the power generation mode, and respectively detecting whether the required power of the fuel cell fluctuates in a preset first range; detecting whether the flow change of an air path of the fuel cell fluctuates within a preset second range; and detecting whether the flow change of a hydrogen gas path of the fuel cell fluctuates within a preset third range or not and whether the current change of each target current sampling point of the fuel cell fluctuates within a preset fourth range or not, and when the required power, the flow change of the air path, the flow change of the hydrogen gas path and the current change of the target current sampling point all fluctuate within corresponding ranges, judging that the fuel cell is in a steady-state working condition.
The first range, the second range, the third range and the fourth range may be selected according to an empirical value or a specific situation, and specific values of the ranges are not limited in the implementation of the present invention.
S102, if yes, determining average voltage values corresponding to the target current sampling points and acquiring target voltage values corresponding to the target current sampling points;
in the embodiment of the invention, each target current sampling point is selected, wherein the target current sampling point is an effective point, even if the current is not completely fixed, the steady-state current fluctuates in a certain range, in order to accurately describe the voltage value, the corresponding average voltage value of each target current sampling point is determined aiming at each target current sampling point, the target voltage value corresponding to each target current sampling point is obtained in the standard polarization curve corresponding to the fuel cell, wherein the standard polarization curve reflects the standard corresponding relation of the voltage and the current in the fuel cell, when the fuel cell meets the performance requirement, the polarization curve of the fuel cell is the same as the standard polarization curve, when the performance of the fuel cell does not meet the requirement, the polarization curve of the fuel cell has a deviation with the standard polarization curve, and the polarization curve has a deviation with the standard polarization curve, as a deteriorated polarization curve. Wherein, the standard polarization curve and the degradation polarization curve of the fuel cell are schematically shown in FIG. 2.
S103, judging whether the difference value between the average voltage value and the target voltage value corresponding to each target current sampling point is larger than a preset first difference value threshold value or not;
in the embodiment of the present invention, a difference between the average voltage value and the target voltage value is calculated for each target current sampling point, the difference is compared with the preset first difference threshold, and whether the difference is greater than the preset first difference threshold is determined, where the first difference threshold may be selected according to an empirical value or a specific situation.
And S104, when the ratio of the number of the sampling points which is greater than the preset first difference value threshold to the total number of the sampling points of each target current is greater than a preset first proportional threshold, judging that the performance of the fuel cell does not meet the requirement.
In the embodiment of the invention, in each target current sampling point, the difference value between the average pressure value and the corresponding target pressure value is counted to be greater than the number of the preset first difference value threshold values, the ratio of the average pressure value to the total number of each target current sampling point is compared with the preset first proportional threshold value, whether the ratio is greater than the preset first proportional threshold value or not is judged, and if yes, the performance of the fuel cell is judged not to meet the requirement.
S106, when the ratio of the number of the sampling points which is larger than the preset first difference value threshold value to the total number of the sampling points of each target current is smaller than a preset first proportional threshold value, judging that the performance of the fuel cell meets the requirement.
The invention discloses a performance detection method of a fuel cell, which comprises the following steps: when detecting that the fuel cell enters a power generation mode, judging whether the fuel cell is under a steady-state working condition; if so, determining an average voltage value corresponding to each target current sampling point and acquiring a target voltage value corresponding to each target current sampling point; judging whether the difference value between the average voltage value corresponding to each target current sampling point and the target voltage value is greater than a preset first difference value threshold value or not according to each target current sampling point; and when the ratio of the number of the sampling points which is greater than the preset first difference value threshold to the total number of the sampling points of the target current is greater than a preset first proportional threshold, judging that the performance of the fuel cell does not meet the requirement. The process provides a performance detection method of the fuel cell, and detection of the performance of the fuel cell can be realized without additionally adding detection equipment in the detection process.
In the embodiment of the present invention, an execution flow for determining an average voltage value corresponding to each target current sampling point and obtaining a target voltage value corresponding to each target current sampling point is shown in fig. 3, and includes the steps of:
s201, determining an average voltage value according to each single-point voltage value corresponding to each current sampling point;
in the embodiment of the invention, because the current cannot be completely fixed, even if the steady-state current fluctuates in a certain range, for each current sampling point, when the corresponding voltage is collected within a certain time T, a collection window DeltI is set, and only the voltage value in the window is collected, wherein a schematic diagram of the current sampling point collection window for single-point voltage value collection is shown in FIG. 4, and the average voltage value of each single-point voltage value obtained by collection is obtained.
S202, comparing each single-point voltage value with the corresponding average voltage value, and discarding the single-point voltage value of which the difference value is greater than a preset second difference threshold value;
in the embodiment of the invention, the difference value between each single-point voltage value corresponding to each current sampling point and the average voltage value is calculated, each difference value is compared with the preset second difference threshold, and the single-point voltage value with the difference value larger than the preset second difference threshold is discarded, wherein the preset second difference threshold can be selected according to an empirical value or a specific situation.
S203, regarding each current sampling point, when the ratio of the number of the unreleased single-point voltage values to the total number of the single-point voltages is greater than a preset second ratio threshold value, taking the current sampling point as a target current sampling point;
in the embodiment of the invention, for each single-point voltage value corresponding to each sampling point, when the ratio of the number of the single-point voltage values which are not discarded to the total number of the single-point voltages is greater than a preset second ratio threshold value, the single-point voltage values are taken as the target current sampling points. The preset second ratio threshold may be selected according to an empirical value or a specific situation, and in the embodiment of the present invention, a specific value of the second ratio threshold is not limited.
S204, acquiring target voltage values corresponding to the target current sampling points in a standard polarization curve corresponding to the fuel cell
In the embodiment of the invention, the standard polarization curve corresponding to the fuel cell is traversed to obtain the target voltage value corresponding to each target current sampling point.
Based on the foregoing method for detecting performance of a fuel cell, an embodiment of the present invention further provides a device for detecting performance of a fuel cell, where a structural block diagram of the device is shown in fig. 5, and the device includes:
a first judging module 301, a determination obtaining module 302, a second judging module 303 and a first judging module 304.
Wherein,
the first judging module 301 is configured to, when it is detected that the fuel cell enters the power generation mode, judge whether the fuel cell is in a steady-state working condition;
the determining and obtaining module 302 is configured to determine an average voltage value corresponding to each target current sampling point and obtain a target voltage value corresponding to each target current sampling point if the average voltage value is positive;
the second determining module 303 is configured to determine, for each target current sampling point, whether a difference between an average voltage value and a target voltage value corresponding to the target current sampling point is greater than a preset first difference threshold;
the first determining module 304 is configured to determine that the performance of the fuel cell does not meet the requirement when a ratio of the number greater than a preset first difference threshold to the total number of the target current sampling points is greater than a preset first proportional threshold.
The invention discloses a performance detection device of a fuel cell, comprising: when detecting that the fuel cell enters a power generation mode, judging whether the fuel cell is under a steady-state working condition; if so, determining an average voltage value corresponding to each target current sampling point and acquiring a target voltage value corresponding to each target current sampling point; judging whether the difference value between the average voltage value corresponding to each target current sampling point and the target voltage value is greater than a preset first difference value threshold value or not according to each target current sampling point; and when the ratio of the number of the sampling points which is greater than the preset first difference value threshold to the total number of the sampling points of the target current is greater than a preset first proportional threshold, judging that the performance of the fuel cell does not meet the requirement. The process provides a performance detection device of the fuel cell, and detection of the performance of the fuel cell can be realized without additionally adding detection equipment in the detection process.
In the embodiment of the invention, the method further comprises the following steps: a second determination module 305.
Wherein,
the second determination module 305 is configured to determine that the performance of the fuel cell meets the requirement when a ratio of the number greater than the preset first difference threshold to the total number of the target current sampling points is smaller than a preset first ratio threshold.
In this embodiment of the present invention, the first determining module 301 includes:
a first detection unit 306, a second detection unit 307, a third detection unit 308, and a fourth detection unit 309.
Wherein,
the first detecting unit 306 is configured to detect whether the required power of the fuel cell fluctuates within a preset first range;
the second detecting unit 307 is configured to detect whether a flow change of an air path of the fuel cell fluctuates within a preset second range;
the third detecting unit 308 is configured to detect whether a flow change of the hydrogen path of the fuel cell fluctuates within a preset third range;
the fourth detecting unit 309 is configured to detect whether a current variation of each target current sampling point of the fuel cell fluctuates within a preset fourth range.
In this embodiment of the present invention, the determining and acquiring module 305 includes:
a first determination unit 310, a comparison-rejection unit 311, a second determination unit 312, and an acquisition unit 313.
Wherein,
the first determining unit 310 is configured to determine, for each current sampling point, an average voltage value according to each single-point voltage value corresponding to the current sampling point;
the comparing and discarding unit 311 compares each single-point voltage value with the corresponding average voltage value, and discards the single-point voltage value whose difference value is greater than the preset second difference threshold;
the second determining unit 312 is configured to, for each current sampling point, regard the current sampling point as a target current sampling point when a ratio of the number of the unreleased single-point voltage values to the total number of the single-point voltages is greater than a preset second ratio threshold;
the acquiring unit 313 is configured to acquire a target voltage value corresponding to each target current sampling point in a standard polarization curve corresponding to the fuel cell.
In this embodiment of the present invention, the first determining unit 310 includes:
a setting subunit 314, a selecting subunit 315, and a calculating subunit 316.
Wherein,
the setting subunit 314 is configured to set a sampling window at each current sampling point at each of left and right ends adjacent to the current sampling point;
the selecting subunit 315 is configured to select each single-point voltage value in the sampling window;
the calculating subunit 316 is configured to calculate an average voltage value of the single-point voltage values.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
From the above description of the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The method and the device for detecting the performance of the fuel cell provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. A method of detecting performance of a fuel cell, comprising:
when detecting that the fuel cell enters a power generation mode, judging whether the fuel cell is under a steady-state working condition;
if so, determining an average voltage value corresponding to each target current sampling point of the fuel cell and acquiring a target voltage value corresponding to each target current sampling point;
judging whether the difference value between the average voltage value corresponding to each target current sampling point and the target voltage value is greater than a preset first difference value threshold value or not according to each target current sampling point;
when the ratio of the number of the sampling points which is greater than a preset first difference value threshold value to the total number of the sampling points of each target current is greater than a preset first proportional threshold value, judging that the performance of the fuel cell does not meet the requirement;
determining an average voltage value corresponding to each target current sampling point and acquiring a target voltage value corresponding to each target current sampling point, wherein the method comprises the following steps:
determining an average voltage value according to each single-point voltage value corresponding to each current sampling point;
comparing each single-point voltage value with the corresponding average voltage value, and discarding the single-point voltage value of which the difference value is greater than a preset second difference threshold value;
for each current sampling point, when the ratio of the number of the unreleased single-point voltage values to the total number of the single-point voltages is greater than a preset second ratio threshold value, taking the total number of the single-point voltages as a target current sampling point;
acquiring target voltage values corresponding to the target current sampling points in a standard polarization curve corresponding to the fuel cell;
for each current sampling point, determining an average voltage value corresponding to the current sampling point, including:
setting sampling windows at the left end and the right end adjacent to each current sampling point respectively;
selecting each single-point voltage value in the sampling window;
and calculating the average voltage value of the single-point voltage values.
2. The method of claim 1, further comprising:
and when the ratio of the number of the sampling points which is greater than the preset first difference value threshold to the total number of the sampling points of each target current is smaller than a preset first proportional threshold, judging that the performance of the fuel cell meets the requirement.
3. The method of claim 1, wherein determining whether the fuel cell is in a steady state condition when it is detected that the fuel cell is entering the power generation mode comprises:
detecting whether the required power of the fuel cell fluctuates in a preset first range;
detecting whether the flow change of an air path of the fuel cell fluctuates within a preset second range;
detecting whether the flow change of the hydrogen gas path of the fuel cell fluctuates within a preset third range;
detecting whether the current change of each target current sampling point of the fuel cell fluctuates within a preset fourth range.
4. A performance detection device for a fuel cell, characterized by comprising:
the first judgment module is used for judging whether the fuel cell is under a steady-state working condition or not when the fuel cell is detected to enter a power generation mode;
the determination acquisition module is used for determining average voltage values corresponding to all target current sampling points of the fuel cell and acquiring target voltage values corresponding to all the target current sampling points if the average voltage values correspond to all the target current sampling points;
the second judgment module is used for judging whether the difference value between the average voltage value and the target voltage value corresponding to each target current sampling point is greater than a preset first difference value threshold value or not;
the first judging module is used for judging that the performance of the fuel cell does not meet the requirement when the ratio of the number of the sampling points which is greater than a preset first difference value threshold value to the total number of the sampling points of the target current is greater than a preset first proportional threshold value;
the determination acquisition module comprises:
the first determining unit is used for determining an average voltage value according to each single-point voltage value corresponding to each current sampling point;
the comparison and rejection unit is used for comparing each single-point voltage value with the corresponding average voltage value and rejecting the single-point voltage value of which the difference value is greater than a preset second difference threshold value;
the second determining unit is used for regarding each current sampling point, and when the ratio of the number of the unreleased single-point voltage values to the total number of the single-point voltages is larger than a preset second ratio threshold value, the current sampling point is taken as a target current sampling point;
an acquisition unit configured to acquire a target voltage value corresponding to each target current sampling point in a standard polarization curve corresponding to the fuel cell;
the first determination unit includes:
setting a stator unit, which is used for setting sampling windows at the left end and the right end adjacent to each current sampling point respectively;
the selecting subunit is used for selecting each single-point voltage value in the sampling window;
and the calculating subunit is used for calculating the average voltage value of each single-point voltage value.
5. The apparatus of claim 4, further comprising:
and the second determination module is used for determining that the performance of the fuel cell meets the requirement when the ratio of the number larger than the preset first difference value threshold to the total number of the target current sampling points is smaller than a preset first proportional threshold.
6. The apparatus of claim 4, wherein the first determining module comprises:
a first detection unit for detecting whether a required power of the fuel cell fluctuates within a preset first range;
the second detection unit is used for detecting whether the flow change of the air path of the fuel cell fluctuates within a preset second range or not;
the third detection unit is used for detecting whether the flow change of the hydrogen gas path of the fuel cell fluctuates within a preset third range or not;
and the fourth detection unit is used for detecting whether the current change of each target current sampling point of the fuel cell fluctuates within a preset fourth range.
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| CN112834857A (en) * | 2021-01-21 | 2021-05-25 | 中国铁塔股份有限公司 | Method and device for detecting abnormality of commercial power outside base station and electronic equipment |
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