CN114329302A - New energy vehicle hydrogen system, gas replacement method and device thereof, and storage medium - Google Patents
New energy vehicle hydrogen system, gas replacement method and device thereof, and storage medium Download PDFInfo
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- CN114329302A CN114329302A CN202011052548.2A CN202011052548A CN114329302A CN 114329302 A CN114329302 A CN 114329302A CN 202011052548 A CN202011052548 A CN 202011052548A CN 114329302 A CN114329302 A CN 114329302A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 652
- 239000001257 hydrogen Substances 0.000 title claims abstract description 603
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 603
- 239000007789 gas Substances 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 303
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 141
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000001301 oxygen Substances 0.000 claims abstract description 66
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 66
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 21
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 7
- 238000005984 hydrogenation reaction Methods 0.000 claims description 35
- 230000006835 compression Effects 0.000 claims description 28
- 238000007906 compression Methods 0.000 claims description 28
- 150000002431 hydrogen Chemical class 0.000 claims description 16
- 125000004435 hydrogen atom Chemical group [H]* 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000006837 decompression Effects 0.000 description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 4
- 238000006467 substitution reaction Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a new energy vehicle hydrogen system, a gas replacement method, a gas replacement device and a storage medium thereof, wherein the method comprises the following steps: s1, calculating the volume fraction of oxygen after adding nitrogen into the hydrogen system according to the pressure and temperature of the gas cylinder before and after adding nitrogen into the hydrogen system; s2, judging whether the volume fraction of the oxygen gas added with the nitrogen gas in the hydrogen system is smaller than a first preset value; repeating the steps S1 to S2 until the volume fraction of oxygen after the hydrogen system is added with nitrogen is less than a first preset value; s3, calculating the volume fraction of hydrogen after adding hydrogen in the hydrogen system according to the pressure and temperature of the gas cylinder before and after adding hydrogen in the hydrogen system; s4, judging whether the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system meets a preset hydrogen using index or not; the steps S3 to S4 are repeatedly performed until the volume fraction of hydrogen gas after the hydrogen system adds hydrogen gas satisfies the preset hydrogen usage index. Therefore, the gas composition of the hydrogen system is accurately calculated, the safe replacement of gas by the hydrogen system is ensured, and the hydrogen using index is met.
Description
Technical Field
The invention relates to the technical field of new energy vehicles, in particular to a gas replacement method of a hydrogen system of a new energy vehicle, a computer readable storage medium, the hydrogen system of the new energy vehicle and a gas replacement device of the hydrogen system of the new energy vehicle.
Background
In recent years, hydrogen fuel cell vehicles have been rapidly developed under the support of policies, and with the development trend, the demand for on-vehicle hydrogen systems has increased, and the design and use requirements of the hydrogen systems will be stricter and more normative.
At present, after a hydrogen system in the related technology is subjected to first hydrogenation on a vehicle or the system maintenance is qualified through airtightness detection, parts such as a hydrogen storage bottle, a pipeline and the like of the hydrogen system contain air and can not be directly hydrogenated into the hydrogen system, so that the hydrogen system needs to be sequentially replaced by nitrogen and hydrogen before hydrogenation to ensure that the safety of the hydrogen system and the hydrogen purity reach the standard, and the hydrogen purity of the replaced hydrogen system reaches the hydrogen index of GB/T37244 plus 2018 Fuel Hydrogen for proton exchange Membrane Fuel cell vehicles, so that normal hydrogenation can be performed.
Therefore, there is a need for an accurate and safe hydrogen system gas replacement method.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a gas replacement method for a hydrogen system of a new energy vehicle, which can accurately calculate a gas composition of the hydrogen system, ensure that the hydrogen system safely replaces gas, and meet a hydrogen utilization index.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide a hydrogen system of the new energy vehicle.
The fourth purpose of the invention is to provide a gas replacement device of a hydrogen system of a new energy vehicle.
In order to achieve the above object, a gas replacement method for a hydrogen system of a new energy vehicle according to an embodiment of a first aspect of the present invention includes the steps of: s1, acquiring the pressure and temperature of the gas cylinder before adding nitrogen into the hydrogen system, acquiring the pressure and temperature of the gas cylinder after adding nitrogen into the hydrogen system, and calculating the volume fraction of oxygen after adding nitrogen into the hydrogen system according to the pressure and temperature of the gas cylinder before adding nitrogen into the hydrogen system, the pressure and temperature of the gas cylinder after adding nitrogen into the hydrogen system; s2, judging whether the volume fraction of the oxygen gas added with the nitrogen gas in the hydrogen system is smaller than a first preset value; repeating the steps S1 to S2 until the volume fraction of oxygen after the hydrogen system is added with nitrogen is less than a first preset value; s3, obtaining the pressure and temperature of the gas cylinder before the hydrogen system adds hydrogen, obtaining the pressure and temperature of the gas cylinder after the hydrogen system adds hydrogen, and calculating the volume fraction of the hydrogen after the hydrogen system adds hydrogen according to the pressure and temperature of the gas cylinder before the hydrogen system adds hydrogen, the pressure and temperature of the gas cylinder after the hydrogen system adds hydrogen; s4, judging whether the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system meets a preset hydrogen using index or not; repeating the steps S3 to S4 until the volume fraction of hydrogen gas after the hydrogen system is added with hydrogen gas meets the preset hydrogen use index.
According to the gas replacement method of the hydrogen system of the new energy vehicle, firstly, the steps S1 to S2 are repeatedly executed, the pressure and the temperature of the gas cylinder before the nitrogen is added into the hydrogen system are obtained, the pressure and the temperature of the gas cylinder after the nitrogen is added into the hydrogen system are obtained, the volume fraction of the oxygen after the nitrogen is added into the hydrogen system is calculated according to the pressure and the temperature of the gas cylinder before the nitrogen is added into the hydrogen system and the pressure and the temperature of the gas cylinder after the nitrogen is added into the hydrogen system, whether the volume fraction of the oxygen after the nitrogen is added into the hydrogen system is smaller than a first preset value or not is judged, until the volume fraction of the oxygen after the nitrogen is added into the hydrogen system is smaller than the first preset value is judged, then the steps S3 to S4 are repeatedly executed, the pressure and the temperature of the gas cylinder before the hydrogen is added into the hydrogen system are obtained, the pressure and the temperature of the gas cylinder after the hydrogen is added into the hydrogen system is obtained, and the pressure and the temperature of the gas cylinder before the hydrogen is added into the hydrogen system is obtained according to the pressure and the temperature of the gas cylinder before the hydrogen system is added into the hydrogen system, And calculating the volume fraction of the hydrogen after the hydrogen system is added with the hydrogen by using the pressure and the temperature of the gas cylinder of the hydrogen system after the hydrogen is added, and judging whether the volume fraction of the hydrogen after the hydrogen is added into the hydrogen system meets a preset hydrogen using index or not until the volume fraction of the hydrogen after the hydrogen is added into the hydrogen system meets the preset hydrogen using index. Therefore, the gas composition of the hydrogen system is accurately calculated, the safe replacement of gas by the hydrogen system is ensured, and the hydrogen using index is met.
In addition, according to the gas replacement method of the hydrogen system of the new energy vehicle in the embodiment of the invention, the following additional technical features can be provided:
according to one embodiment of the invention, the volume fraction of oxygen after addition of nitrogen to the hydrogen system is calculated according to the following formula:
wherein N isOnThe volume fraction of oxygen, Z, after the n-th addition of nitrogen to the hydrogen systemDnOxygen compression factor, P, before the n-th addition of nitrogen to a hydrogen systemDnCylinder pressure, T, before n-th nitrogen addition for a hydrogen systemDnCylinder temperature, Z, before the nth addition of nitrogen for a hydrogen systemGnFor the oxygen compression factor, P, after the n-th addition of nitrogen to a hydrogen systemGnThe cylinder pressure, T, after the n-th addition of nitrogen to the hydrogen systemGnFor the cylinder temperature after the N-th addition of nitrogen, N, to the hydrogen systemOn-1The volume fraction of oxygen after the N-1 th addition of nitrogen to the hydrogen system, and NO0＝21％。
According to one embodiment of the invention, the hydrogen gas volume fraction after addition of hydrogen gas to the hydrogen system is calculated according to the following formula:
wherein N isHnFor the nth hydrogen gas of hydrogen systemThen hydrogen volume fraction, ZNDnHydrogen compression factor, P, before the nth hydrogen addition in a hydrogen systemHDnCylinder pressure, T, before the nth hydrogen addition in a hydrogen systemHDnCylinder temperature, Z, before the nth hydrogen addition in a hydrogen systemNGnHydrogen compression factor, P, after the nth hydrogenation of a hydrogen systemHGnThe cylinder pressure, T, after the nth hydrogenation of the hydrogen systemHGnThe cylinder temperature after the nth hydrogenation of the hydrogen system, NHn-1Is the volume fraction of hydrogen after the N-1 th hydrogenation of the hydrogen system, and NH0＝0。
According to one embodiment of the invention, after the hydrogen system is currently added with nitrogen, the hydrogen system is also decompressed, and the pressure and the temperature of the gas cylinder after decompression are used as the pressure and the temperature of the gas cylinder before the hydrogen system is added with nitrogen next time.
According to one embodiment of the invention, after the hydrogen system currently adds hydrogen, the hydrogen system is also decompressed, and the cylinder pressure and the cylinder temperature after decompression are used as the cylinder pressure and the cylinder temperature before the hydrogen system adds the next hydrogen.
In order to achieve the above object, a computer-readable storage medium is provided in an embodiment of a second aspect of the present invention, on which a gas replacement program of a new energy vehicle hydrogen system is stored, which when executed by a processor implements the gas replacement method of the new energy vehicle hydrogen system as described above.
According to the computer-readable storage medium of the embodiment of the invention, by executing the gas replacement program on which the hydrogen system of the new energy vehicle is stored by the processor, the gas composition of the hydrogen system can be accurately calculated, the hydrogen system is ensured to safely replace the gas, and the hydrogen utilization index is met.
In order to achieve the above object, a hydrogen system of a new energy vehicle according to a third aspect of the present invention includes a memory, a processor, and a gas replacement program of the hydrogen system of the new energy vehicle stored in the memory and operable on the processor, where the processor implements the gas replacement method of the hydrogen system of the new energy vehicle when executing the gas replacement program of the hydrogen system of the new energy vehicle.
According to the hydrogen system of the new energy vehicle, the gas replacement program of the hydrogen system of the new energy vehicle stored in the memory is run on the processor, so that the gas composition of the hydrogen system can be accurately calculated, the hydrogen system can safely replace gas, and the hydrogen using index can be met.
In order to achieve the above object, a fourth aspect of the present invention provides a gas replacement device for a hydrogen system of a new energy vehicle, including: the first acquisition module is used for acquiring the pressure and the temperature of the gas cylinder before the hydrogen system adds the nitrogen gas each time, and acquiring the pressure and the temperature of the gas cylinder after the hydrogen system adds the nitrogen gas each time; the first calculation module is used for calculating the volume fraction of oxygen after the hydrogen system adds the nitrogen each time according to the pressure and the temperature of the gas cylinder before the hydrogen system adds the nitrogen each time, the pressure and the temperature of the gas cylinder after the hydrogen system adds the nitrogen each time; the first judgment module is used for judging whether the volume fraction of the oxygen after the nitrogen is added to the hydrogen system every time is smaller than a first preset value until the volume fraction of the oxygen after the nitrogen is added to the hydrogen system is smaller than the first preset value; the second acquisition module is used for acquiring the gas cylinder pressure and the gas cylinder temperature before the hydrogen system adds hydrogen for each time, and acquiring the gas cylinder pressure and the gas cylinder temperature after the hydrogen system adds hydrogen for each time; the second calculation module is used for calculating the volume fraction of the hydrogen gas after the hydrogen gas is added to the hydrogen system each time according to the pressure and the temperature of the gas cylinder before the hydrogen gas is added to the hydrogen system each time, the pressure and the temperature of the gas cylinder after the hydrogen gas is added to the hydrogen system each time; and the second judgment module is used for judging whether the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system every time meets the preset hydrogen utilization index or not until the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system meets the preset hydrogen utilization index.
According to the gas replacement device of the hydrogen system of the new energy vehicle, the first obtaining module is used for obtaining the gas cylinder pressure and the gas cylinder temperature before the hydrogen system adds nitrogen for each time, the gas cylinder pressure and the gas cylinder temperature after the hydrogen system adds nitrogen for each time are obtained, the first calculating module is used for calculating the oxygen volume fraction after the hydrogen system adds nitrogen for each time according to the gas cylinder pressure and the gas cylinder temperature before the hydrogen system adds nitrogen for each time, the gas cylinder pressure and the gas cylinder temperature after the hydrogen system adds nitrogen for each time, the first judging module is used for judging whether the oxygen volume fraction after the hydrogen system adds nitrogen for each time is smaller than the first preset value or not until the oxygen volume fraction after the hydrogen system adds nitrogen is determined to be smaller than the first preset value, the second obtaining module is used for obtaining the gas cylinder pressure and the gas cylinder temperature before the hydrogen system adds hydrogen for each time, and the gas cylinder pressure and the gas cylinder temperature after the hydrogen system adds hydrogen for each time are obtained, and calculating the volume fraction of the hydrogen gas of the hydrogen system after adding the hydrogen gas each time through a second calculation module according to the pressure and the temperature of the gas cylinder before adding the hydrogen gas of the hydrogen system each time, the pressure and the temperature of the gas cylinder after adding the hydrogen gas of the hydrogen system each time, and judging whether the volume fraction of the hydrogen gas after adding the hydrogen gas of the hydrogen system each time meets the preset hydrogen using index through a second judgment module until the volume fraction of the hydrogen gas after adding the hydrogen gas of the hydrogen system meets the preset hydrogen using index. Therefore, the gas composition of the hydrogen system is accurately calculated, the safe replacement of gas by the hydrogen system is ensured, and the hydrogen using index is met.
In addition, the gas replacement device of the hydrogen system of the new energy vehicle according to the above embodiment of the present invention may further have the following additional features:
according to one embodiment of the invention, the first calculation module calculates the volume fraction of oxygen after addition of nitrogen to the hydrogen system according to the following formula:
wherein N isOnThe volume fraction of oxygen, Z, after the n-th addition of nitrogen to the hydrogen systemDnOxygen compression factor, P, before the n-th addition of nitrogen to a hydrogen systemDnCylinder pressure, T, before n-th nitrogen addition for a hydrogen systemDnCylinder temperature, Z, before the nth addition of nitrogen for a hydrogen systemGnFor the oxygen compression factor, P, after the n-th addition of nitrogen to a hydrogen systemGnThe cylinder pressure, T, after the n-th addition of nitrogen to the hydrogen systemGnAfter the n-th addition of nitrogen for hydrogen systemsTemperature of gas cylinder, NOn-1The volume fraction of oxygen after the N-1 th addition of nitrogen to the hydrogen system, and NO0＝21％。
According to one embodiment of the present invention, the second calculation module calculates the hydrogen gas volume fraction after the hydrogen system is charged with hydrogen gas according to the following formula:
wherein N isHnVolume fraction of hydrogen after n-th hydrogenation of hydrogen system, ZNDnHydrogen compression factor, P, before the nth hydrogen addition in a hydrogen systemHDnCylinder pressure, T, before the nth hydrogen addition in a hydrogen systemHDnCylinder temperature, Z, before the nth hydrogen addition in a hydrogen systemNGnHydrogen compression factor, P, after the nth hydrogenation of a hydrogen systemHGnThe cylinder pressure, T, after the nth hydrogenation of the hydrogen systemHGnThe cylinder temperature after the nth hydrogenation of the hydrogen system, NHn-1Is the volume fraction of hydrogen after the N-1 th hydrogenation of the hydrogen system, and NH0＝0。
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic flow diagram of a gas replacement method of a new energy vehicle hydrogen system according to an embodiment of the invention;
fig. 2 is a schematic flow diagram of a gas displacement method of a new energy vehicle hydrogen system according to an embodiment of the invention;
FIG. 3 is a block schematic diagram of a hydrogen system of a new energy vehicle according to an embodiment of the invention;
fig. 4 is a block diagram schematically illustrating a gas replacement device of a hydrogen system of a new energy vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A gas replacement method of a new energy vehicle hydrogen system, a computer-readable storage medium, a hydrogen system of a new energy vehicle, and a gas replacement device of a new energy vehicle hydrogen system of an embodiment of the present invention are described below with reference to the drawings.
Fig. 1 is a schematic flow chart of a gas replacement method of a hydrogen system of a new energy vehicle according to an embodiment of the invention.
As shown in fig. 1, the gas replacement method for the hydrogen system of the new energy vehicle includes the following steps:
and S1, acquiring the pressure and the temperature of the gas cylinder before the nitrogen is added into the hydrogen system, acquiring the pressure and the temperature of the gas cylinder after the nitrogen is added into the hydrogen system, and calculating the volume fraction of the oxygen after the nitrogen is added into the hydrogen system according to the pressure and the temperature of the gas cylinder before the nitrogen is added into the hydrogen system, the pressure and the temperature of the gas cylinder after the nitrogen is added into the hydrogen system.
Alternatively, the cylinder pressure before the hydrogen system adds nitrogen and the cylinder temperature after the hydrogen system adds nitrogen may be obtained by setting a pressure gauge, and the cylinder temperature before the hydrogen system adds nitrogen and the cylinder temperature after the hydrogen system adds nitrogen may be obtained by setting a temperature gauge.
Specifically, the volume fraction of oxygen after addition of nitrogen to the hydrogen system is calculated according to the following formula:
wherein N isOnThe volume fraction of oxygen, Z, after the n-th addition of nitrogen to the hydrogen systemDnOxygen compression factor, P, before the n-th addition of nitrogen to a hydrogen systemDnCylinder pressure, T, before n-th nitrogen addition for a hydrogen systemDnCylinder temperature, Z, before the nth addition of nitrogen for a hydrogen systemGnAdding nitrogen for the n-th time of a hydrogen systemOxygen compression factor, P, after gasGnThe cylinder pressure, T, after the n-th addition of nitrogen to the hydrogen systemGnFor the cylinder temperature after the N-th addition of nitrogen, N, to the hydrogen systemOn-1The volume fraction of oxygen after the N-1 th addition of nitrogen to the hydrogen system, and NO0＝21％。
That is, the cylinder pressure P before and after the hydrogen system adds nitrogen gas can be determinedD、PGAnd cylinder temperature TD、TGAnd the oxygen compression factor Z before addition of nitrogenDAnd oxygen compression factor Z after addition of nitrogenGVolume fraction of oxygen N after addition of nitrogen to a hydrogen systemOCalculations were performed to accurately determine the gas composition in the cylinder after the hydrogen system was charged with nitrogen.
In addition, N isO0At 21%, it is assumed that the oxygen content in the cylinder of the hydrogen system is 21% before the first nitrogen fill into the hydrogen system.
And S2, judging whether the volume fraction of the oxygen after the hydrogen system adds the nitrogen is smaller than a first preset value.
Alternatively, the first preset value may be set according to the volume fraction of oxygen when the gas cylinder is safely operated, and for example, the first preset value may be preferably 0.5%.
It should be noted that the oxygen volume fraction after the hydrogen system adds the nitrogen gas can be used to determine the nitrogen gas content and the oxygen gas content in the hydrogen system gas cylinder, so as to determine whether the hydrogen system has completed the nitrogen gas replacement according to the oxygen volume fraction after the hydrogen system adds the nitrogen gas.
It should be understood that, in the embodiment of the present invention, it is necessary to perform the steps S1 to S2 by repeating until the volume fraction of oxygen after the hydrogen system adds nitrogen is less than the first preset value.
Specifically, if the volume fraction of oxygen after the hydrogen system is added with nitrogen is greater than or equal to 0.5%, it may be determined that the hydrogen system does not complete the nitrogen substitution, at which point, the hydrogen system is controlled to continue to perform step S1, and nitrogen continues to be added to the hydrogen system, and, if the volume fraction of oxygen after the hydrogen system is added with nitrogen is less than 0.5%, it may be determined that the hydrogen system has completed the nitrogen substitution, at which point, the hydrogen system is controlled to enter the next step for hydrogen substitution.
S3, obtaining the pressure and temperature of the gas cylinder before the hydrogen system adds hydrogen, obtaining the pressure and temperature of the gas cylinder after the hydrogen system adds hydrogen, and calculating the volume fraction of the hydrogen after the hydrogen system adds hydrogen according to the pressure and temperature of the gas cylinder before the hydrogen system adds hydrogen, the pressure and temperature of the gas cylinder after the hydrogen system adds hydrogen.
Alternatively, the cylinder pressure before the hydrogen system is used for adding hydrogen and the cylinder temperature after the hydrogen system is used for adding hydrogen can be obtained by setting pressure gauges, and the cylinder temperature before the hydrogen system is used for adding hydrogen and the cylinder temperature after the hydrogen system is used for adding hydrogen can be obtained by setting temperature gauges.
Specifically, the hydrogen volume fraction after hydrogen addition in the hydrogen system is calculated according to the following formula:
wherein N isHnVolume fraction of hydrogen after n-th hydrogenation of hydrogen system, ZNDnHydrogen compression factor, P, before the nth hydrogen addition in a hydrogen systemHDnCylinder pressure, T, before the nth hydrogen addition in a hydrogen systemHDnCylinder temperature, Z, before the nth hydrogen addition in a hydrogen systemNGnHydrogen compression factor, P, after the nth hydrogenation of a hydrogen systemHGnThe cylinder pressure, T, after the nth hydrogenation of the hydrogen systemHGnThe cylinder temperature after the nth hydrogenation of the hydrogen system, NHn-1Is the volume fraction of hydrogen after the N-1 th hydrogenation of the hydrogen system, and NH0＝0。
That is, the cylinder pressure P before and after hydrogen addition in the hydrogen system can be determinedHD、PHGAnd cylinder temperature THD、THGAnd a hydrogen compression factor Z before hydrogenationNDAnd hydrogen compression factor Z after hydrogenationNGVolume fraction N of hydrogen after addition of hydrogen to a hydrogen systemHCalculations were performed to accurately determine the gas composition in the cylinder after the hydrogen system was charged with hydrogen gas.
In addition, N isH0And (5) 0, namely, pure nitrogen is assumed to be in the gas cylinder of the hydrogen system before the hydrogen system is filled with hydrogen for the first time.
And S4, judging whether the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system meets a preset hydrogen using index.
Alternatively, the preset hydrogen use index may be set according to the volume fraction of hydrogen when the gas cylinder is safely operated, and for example, the preset hydrogen use index may be preferably 99.97%.
It should be noted that the integral number of hydrogen gas after the hydrogen gas is added to the hydrogen system can be used to determine the hydrogen content in the gas cylinder of the hydrogen system, so as to determine whether the hydrogen system has completed hydrogen gas replacement according to the volume fraction of hydrogen gas after the hydrogen gas is added to the hydrogen system, and meet the hydrogen consumption index.
It should be understood that, in the embodiment of the present invention, it is necessary to repeatedly perform the steps S3 to S4 until the volume fraction of hydrogen gas after the hydrogen system adds hydrogen gas satisfies the preset hydrogen usage index.
Specifically, if the integral number of the hydrogen gas after the hydrogen gas is added to the hydrogen system does not satisfy 99.97%, it may be determined that the hydrogen system does not complete the hydrogen gas replacement and does not satisfy the hydrogen use index, at this time, the hydrogen system is controlled to continue to perform step S3, hydrogen gas continues to be added to the hydrogen system, and if the volume fraction of the hydrogen gas after the hydrogen gas is added to the hydrogen system satisfies the preset hydrogen use index of 99.97%, it may be determined that the hydrogen system has completed the hydrogen gas replacement and satisfies the hydrogen use index, at this time, the hydrogen system may be normally used by hydrogenation.
Further, after the hydrogen system is currently filled with nitrogen, the pressure of the hydrogen system is released, and the pressure and the temperature of the gas cylinder after the pressure release are used as the pressure and the temperature of the gas cylinder before the next nitrogen filling of the hydrogen system.
That is, after the hydrogen system is currently charged with nitrogen, the cylinder pressure and the cylinder temperature after the current pressure relief can be taken as the cylinder pressure and the cylinder temperature before the hydrogen system is next charged with nitrogen.
Further, after the hydrogen system currently adds hydrogen, the hydrogen system is decompressed, and the pressure and the temperature of the gas cylinder after decompression are used as the pressure and the temperature of the gas cylinder before the next hydrogen addition of the hydrogen system.
That is, after the hydrogen system currently adds hydrogen, the cylinder pressure and the cylinder temperature after the current pressure relief can be used as the cylinder pressure and the cylinder temperature before the hydrogen system adds hydrogen next time.
The gas replacement method of the hydrogen system of the new energy vehicle according to the embodiment of the present invention is further described with reference to fig. 2 and an embodiment of the present invention.
Specifically, as shown in fig. 2, after the hydrogen system is first hydrogenated on the vehicle or the hydrogen system is repaired and the airtightness is detected to be qualified, step S10 is performed.
And S10, acquiring the pressure and the temperature of the gas cylinder before the hydrogen system adds the nitrogen.
And S11, acquiring the pressure and the temperature of the gas cylinder after the hydrogen system adds the nitrogen.
And S12, calculating the volume fraction of oxygen after the hydrogen system is added with the nitrogen according to the pressure and the temperature of the gas cylinder before the hydrogen system is added with the nitrogen, the pressure and the temperature of the gas cylinder after the hydrogen system is added with the nitrogen.
S13, judging whether the volume fraction of the oxygen gas after the nitrogen gas is added into the hydrogen system is smaller than a first preset value, if so, executing a step S14; if not, step S10 is performed.
And S14, acquiring the pressure and the temperature of the gas cylinder before the hydrogen is added into the hydrogen system.
And S15, acquiring the pressure and the temperature of the gas cylinder after the hydrogen system adds the hydrogen.
And S16, calculating the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system according to the pressure and the temperature of the gas cylinder before the hydrogen gas is added into the hydrogen system, and the pressure and the temperature of the gas cylinder after the hydrogen gas is added into the hydrogen system.
S17, judging whether the volume fraction of the hydrogen gas after the hydrogen system is added with the hydrogen gas meets a preset hydrogen using index, if so, executing a step S18; if not, step S14 is performed.
And S18, finishing gas replacement of the hydrogen system, and using the hydrogen normally.
It should be noted that, after the hydrogen system currently adds nitrogen, the hydrogen system is also decompressed, and the pressure of the gas cylinder and the temperature of the gas cylinder after decompression are used as the pressure of the gas cylinder and the temperature of the gas cylinder before the next nitrogen addition of the hydrogen system, and after the hydrogen system currently adds hydrogen, the hydrogen system is also decompressed, and the pressure of the gas cylinder and the temperature of the gas cylinder after decompression are used as the pressure of the gas cylinder and the temperature of the gas cylinder before the next hydrogen addition of the hydrogen system.
In summary, according to the gas replacement method of the hydrogen system of the new energy vehicle in the embodiment of the invention, the steps S1 to S2 are repeatedly executed, the cylinder pressure and the cylinder temperature before the nitrogen gas is added to the hydrogen system are obtained, the cylinder pressure and the cylinder temperature after the nitrogen gas is added to the hydrogen system are obtained, the oxygen volume fraction after the nitrogen gas is added to the hydrogen system is calculated according to the cylinder pressure and the cylinder temperature before the nitrogen gas is added to the hydrogen system, the cylinder pressure and the cylinder temperature after the nitrogen gas is added to the hydrogen system are judged whether to be smaller than the first preset value or not, until the oxygen volume fraction after the nitrogen gas is added to the hydrogen system is smaller than the first preset value, the steps S3 to S4 are repeatedly executed, the cylinder pressure and the cylinder temperature before the hydrogen gas is added to the hydrogen system are obtained, the cylinder pressure and the cylinder temperature after the hydrogen gas is added to the hydrogen system are obtained, and the cylinder pressure and the cylinder temperature before the hydrogen gas is added to the hydrogen system is obtained according to the hydrogen system, And calculating the volume fraction of the hydrogen after the hydrogen system is added with the hydrogen by using the pressure and the temperature of the gas cylinder of the hydrogen system after the hydrogen is added, and judging whether the volume fraction of the hydrogen after the hydrogen is added into the hydrogen system meets a preset hydrogen using index or not until the volume fraction of the hydrogen after the hydrogen is added into the hydrogen system meets the preset hydrogen using index. Therefore, the gas composition of the hydrogen system is accurately calculated, the safe replacement of gas by the hydrogen system is ensured, and the hydrogen using index is met.
Further, an embodiment of the present invention also provides a computer-readable storage medium on which a gas replacement program of a new energy vehicle hydrogen system is stored, which when executed by a processor implements the gas replacement method of the new energy vehicle hydrogen system as described in the embodiment of the present invention.
It should be noted that, when the gas replacement program of the new energy vehicle hydrogen system is executed by the processor, a specific implementation manner corresponding to the gas replacement method of the new energy vehicle hydrogen system according to the foregoing embodiment of the invention can be implemented, and details are not described herein again.
In summary, according to the computer-readable storage medium of the embodiment of the invention, by executing the gas replacement program on which the hydrogen system of the new energy vehicle is stored by the processor, the gas composition of the hydrogen system can be accurately calculated, the hydrogen system is ensured to safely replace the gas, and the hydrogen utilization index is satisfied.
Fig. 3 is a block schematic diagram of a hydrogen system of a new energy vehicle according to an embodiment of the invention.
As shown in fig. 3, the hydrogen system 1000 of the new energy vehicle includes a memory 101, a processor 102, and a gas replacement program of the hydrogen system of the new energy vehicle stored in the memory 101 and operable on the processor, and when the processor 102 executes the gas replacement program of the hydrogen system of the new energy vehicle, the gas replacement method of the hydrogen system of the new energy vehicle according to the embodiment of the present invention is implemented.
It should be noted that, when the processor 102 executes the gas replacement procedure of the new energy vehicle hydrogen system, the specific implementation manner corresponding to the gas replacement method of the new energy vehicle hydrogen system according to the foregoing embodiment of the invention can be implemented, and details are not described herein again.
In summary, according to the hydrogen system of the new energy vehicle of the embodiment of the invention, the gas composition of the hydrogen system can be accurately calculated by running the gas replacement program of the hydrogen system of the new energy vehicle stored in the memory on the processor, so that the hydrogen system can safely replace gas and meet the hydrogen consumption index.
Fig. 4 is a block diagram schematically illustrating a gas replacement device of a hydrogen system of a new energy vehicle according to an embodiment of the present invention.
As shown in fig. 4, the gas replacement device 100 of the hydrogen system of the new energy vehicle includes: the device comprises a first obtaining module 10, a first calculating module 20, a first judging module 30, a second obtaining module 40, a second calculating module 50 and a second judging module 60.
Specifically, the first obtaining module 10 is configured to obtain a gas cylinder pressure and a gas cylinder temperature before the hydrogen system adds nitrogen each time, and obtain a gas cylinder pressure and a gas cylinder temperature after the hydrogen system adds nitrogen each time; the first calculation module 20 is configured to calculate the volume fraction of oxygen after the hydrogen system adds nitrogen each time according to the pressure and temperature of the gas cylinder before the hydrogen system adds nitrogen each time, and the pressure and temperature of the gas cylinder after the hydrogen system adds nitrogen each time; the first judging module 30 is configured to judge whether the volume fraction of the oxygen gas after the nitrogen gas is added to the hydrogen system each time is smaller than a first preset value until it is determined that the volume fraction of the oxygen gas after the nitrogen gas is added to the hydrogen system is smaller than the first preset value.
In addition, the second obtaining module 40 is configured to obtain a gas cylinder pressure and a gas cylinder temperature before hydrogen is added to the hydrogen system each time, and obtain a gas cylinder pressure and a gas cylinder temperature after hydrogen is added to the hydrogen system each time; the second calculating module 50 is configured to calculate a volume fraction of hydrogen gas after hydrogen gas is added to the hydrogen system each time according to a pressure of the gas cylinder and a temperature of the gas cylinder before hydrogen gas is added to the hydrogen system each time, and a pressure of the gas cylinder after hydrogen gas is added to the hydrogen system each time and a temperature of the gas cylinder; the second determining module 60 is configured to determine whether the volume fraction of hydrogen gas after hydrogen gas is added to the hydrogen system each time meets a preset hydrogen utilization index until it is determined that the volume fraction of hydrogen gas after hydrogen gas is added to the hydrogen system meets the preset hydrogen utilization index.
Further, the first calculation module 10 calculates the volume fraction of oxygen after the hydrogen system is charged with nitrogen according to the following formula:
wherein N isOnThe volume fraction of oxygen, Z, after the n-th addition of nitrogen to the hydrogen systemDnOxygen compression factor, P, before the n-th addition of nitrogen to a hydrogen systemDnCylinder pressure, T, before n-th nitrogen addition for a hydrogen systemDnCylinder temperature, Z, before the nth addition of nitrogen for a hydrogen systemGnFor the oxygen compression factor, P, after the n-th addition of nitrogen to a hydrogen systemGnThe cylinder pressure, T, after the n-th addition of nitrogen to the hydrogen systemGnFor the cylinder temperature after the N-th addition of nitrogen, N, to the hydrogen systemOn-1Volume of oxygen after n-1 th addition of nitrogen for hydrogen systemFraction, and NO0＝21％。
Further, the second calculation module 40 calculates the hydrogen volume fraction of the hydrogen system after adding hydrogen gas according to the following formula:
wherein N isHnVolume fraction of hydrogen after n-th hydrogenation of hydrogen system, ZNGnHydrogen compression factor, P, before the nth hydrogen addition in a hydrogen systemHDnCylinder pressure, T, before the nth hydrogen addition in a hydrogen systemHDnCylinder temperature, Z, before the nth hydrogen addition in a hydrogen systemNGnHydrogen compression factor, P, after the nth hydrogenation of a hydrogen systemHGnThe cylinder pressure, T, after the nth hydrogenation of the hydrogen systemHGnThe cylinder temperature after the nth hydrogenation of the hydrogen system, NHn-1Is the volume fraction of hydrogen after the N-1 th hydrogenation of the hydrogen system, and NH0＝0。
It should be noted that the specific implementation of the gas replacement device 100 of the new energy vehicle hydrogen system according to the embodiment of the present invention corresponds to the specific implementation of the gas replacement method of the new energy vehicle hydrogen system according to the foregoing embodiment of the present invention, and details are not repeated herein.
In summary, according to the gas replacement device of the hydrogen system of the new energy vehicle in the embodiment of the invention, the first obtaining module is used to obtain the cylinder pressure and the cylinder temperature before the hydrogen system adds nitrogen each time, and obtain the cylinder pressure and the cylinder temperature after the hydrogen system adds nitrogen each time, the first calculating module is used to calculate the oxygen volume fraction after the hydrogen system adds nitrogen each time according to the cylinder pressure and the cylinder temperature before the hydrogen system adds nitrogen each time, the cylinder pressure and the cylinder temperature after the hydrogen system adds nitrogen each time, and the first judging module is used to judge whether the oxygen volume fraction after the hydrogen system adds nitrogen each time is smaller than the first preset value until determining that the oxygen volume fraction after the hydrogen system adds nitrogen is smaller than the first preset value, and further, the second obtaining module is used to obtain the cylinder pressure and the cylinder temperature before the hydrogen system adds hydrogen each time, and obtain the cylinder pressure and the cylinder temperature after the hydrogen system adds hydrogen each time, and calculating the volume fraction of the hydrogen gas of the hydrogen system after adding the hydrogen gas each time through a second calculation module according to the pressure and the temperature of the gas cylinder before adding the hydrogen gas of the hydrogen system each time, the pressure and the temperature of the gas cylinder after adding the hydrogen gas of the hydrogen system each time, and judging whether the volume fraction of the hydrogen gas after adding the hydrogen gas of the hydrogen system each time meets the preset hydrogen using index through a second judgment module until the volume fraction of the hydrogen gas after adding the hydrogen gas of the hydrogen system meets the preset hydrogen using index. Therefore, the gas composition of the hydrogen system is accurately calculated, the safe replacement of gas by the hydrogen system is ensured, and the hydrogen using index is met.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A gas replacement method for a hydrogen system of a new energy vehicle is characterized by comprising the following steps:
s1, acquiring the pressure and temperature of the gas cylinder before adding nitrogen into the hydrogen system, acquiring the pressure and temperature of the gas cylinder after adding nitrogen into the hydrogen system, and calculating the volume fraction of oxygen after adding nitrogen into the hydrogen system according to the pressure and temperature of the gas cylinder before adding nitrogen into the hydrogen system, the pressure and temperature of the gas cylinder after adding nitrogen into the hydrogen system;
s2, judging whether the volume fraction of the oxygen gas added with the nitrogen gas in the hydrogen system is smaller than a first preset value;
repeating the steps S1 to S2 until the volume fraction of oxygen after the hydrogen system is added with nitrogen is less than a first preset value;
s3, obtaining the pressure and temperature of the gas cylinder before the hydrogen system adds hydrogen, obtaining the pressure and temperature of the gas cylinder after the hydrogen system adds hydrogen, and calculating the volume fraction of the hydrogen after the hydrogen system adds hydrogen according to the pressure and temperature of the gas cylinder before the hydrogen system adds hydrogen, the pressure and temperature of the gas cylinder after the hydrogen system adds hydrogen;
s4, judging whether the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system meets a preset hydrogen using index or not;
repeating the steps S3 to S4 until the volume fraction of hydrogen gas after the hydrogen system is added with hydrogen gas meets the preset hydrogen use index.
2. The gas replacement method for the hydrogen system of the new energy vehicle according to claim 1, wherein the volume fraction of oxygen after the hydrogen system is added with nitrogen is calculated according to the following formula:
wherein N isOnThe volume fraction of oxygen, Z, after the n-th addition of nitrogen to the hydrogen systemDnOxygen compression factor, P, before the n-th addition of nitrogen to a hydrogen systemDnCylinder pressure, T, before n-th nitrogen addition for a hydrogen systemDnCylinder temperature, Z, before the nth addition of nitrogen for a hydrogen systemGnFor the oxygen compression factor, P, after the n-th addition of nitrogen to a hydrogen systemGnThe cylinder pressure, T, after the n-th addition of nitrogen to the hydrogen systemGnFor the cylinder temperature after the N-th addition of nitrogen, N, to the hydrogen systemOn-1The volume fraction of oxygen after the N-1 th addition of nitrogen to the hydrogen system, and NO0＝21％。
3. The gas replacement method for a new energy vehicle hydrogen system according to claim 1, characterized in that the volume fraction of hydrogen gas after the hydrogen system is charged with hydrogen gas is calculated according to the following formula:
wherein N isHnVolume fraction of hydrogen after n-th hydrogenation of hydrogen system, ZNDnHydrogen compression factor, P, before the nth hydrogen addition in a hydrogen systemHDnCylinder pressure, T, before the nth hydrogen addition in a hydrogen systemHDnCylinder temperature, Z, before the nth hydrogen addition in a hydrogen systemNGnHydrogen compression factor, P, after the nth hydrogenation of a hydrogen systemHGnThe cylinder pressure, T, after the nth hydrogenation of the hydrogen systemHGnThe cylinder temperature after the nth hydrogenation of the hydrogen system, NHn-1Is the volume fraction of hydrogen after the N-1 th hydrogenation of the hydrogen system, and NH0＝0。
4. The gas replacement method for the hydrogen system of the new energy vehicle as claimed in any one of claims 1 to 3, wherein after the hydrogen system is currently charged with nitrogen, the hydrogen system is also depressurized, and the cylinder pressure and the cylinder temperature after depressurization are used as the cylinder pressure and the cylinder temperature before the hydrogen system is next charged with nitrogen.
5. The gas replacement method for the hydrogen system of the new energy vehicle as claimed in any one of claims 1 to 3, wherein after the hydrogen system currently adds hydrogen, the pressure of the hydrogen system is also released, and the pressure and the temperature of the gas cylinder after the pressure release are used as the pressure and the temperature of the gas cylinder before the hydrogen system adds hydrogen next time.
6. A computer-readable storage medium, characterized in that a gas replacement program of a new energy vehicle hydrogen system is stored thereon, which when executed by a processor, implements the gas replacement method of the new energy vehicle hydrogen system according to any one of claims 1 to 5.
7. A hydrogen system of a new energy vehicle, which is characterized by comprising a memory, a processor and a gas replacement program of the hydrogen system of the new energy vehicle, wherein the gas replacement program is stored in the memory and can be operated on the processor, and when the processor executes the gas replacement program of the hydrogen system of the new energy vehicle, the gas replacement method of the hydrogen system of the new energy vehicle as claimed in any one of claims 1 to 6 is realized.
8. A gas replacement device of a hydrogen system of a new energy vehicle, characterized by comprising:
the first acquisition module is used for acquiring the pressure and the temperature of the gas cylinder before the hydrogen system adds the nitrogen gas each time, and acquiring the pressure and the temperature of the gas cylinder after the hydrogen system adds the nitrogen gas each time;
the first calculation module is used for calculating the volume fraction of oxygen after the hydrogen system adds the nitrogen each time according to the pressure and the temperature of the gas cylinder before the hydrogen system adds the nitrogen each time, the pressure and the temperature of the gas cylinder after the hydrogen system adds the nitrogen each time;
the first judgment module is used for judging whether the volume fraction of the oxygen after the nitrogen is added to the hydrogen system every time is smaller than a first preset value until the volume fraction of the oxygen after the nitrogen is added to the hydrogen system is smaller than the first preset value;
the second acquisition module is used for acquiring the gas cylinder pressure and the gas cylinder temperature before the hydrogen system adds hydrogen for each time, and acquiring the gas cylinder pressure and the gas cylinder temperature after the hydrogen system adds hydrogen for each time;
the second calculation module is used for calculating the volume fraction of the hydrogen gas after the hydrogen gas is added to the hydrogen system each time according to the pressure and the temperature of the gas cylinder before the hydrogen gas is added to the hydrogen system each time, the pressure and the temperature of the gas cylinder after the hydrogen gas is added to the hydrogen system each time;
and the second judgment module is used for judging whether the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system every time meets the preset hydrogen utilization index or not until the volume fraction of the hydrogen gas after the hydrogen gas is added into the hydrogen system meets the preset hydrogen utilization index.
9. The gas replacement device for a hydrogen system of a new energy vehicle of claim 8, wherein the first calculation module calculates the volume fraction of oxygen after the hydrogen system is added with nitrogen according to the following formula:
wherein N isOnThe volume fraction of oxygen, Z, after the n-th addition of nitrogen to the hydrogen systemDnOxygen compression factor, P, before the n-th addition of nitrogen to a hydrogen systemDnCylinder pressure, T, before n-th nitrogen addition for a hydrogen systemDnCylinder temperature, Z, before the nth addition of nitrogen for a hydrogen systemGnFor the oxygen compression factor, P, after the n-th addition of nitrogen to a hydrogen systemGnThe cylinder pressure, T, after the n-th addition of nitrogen to the hydrogen systemGnFor the cylinder temperature after the N-th addition of nitrogen, N, to the hydrogen systemOn-1The volume fraction of oxygen after the N-1 th addition of nitrogen to the hydrogen system, and NO0＝21％。
10. The gas replacement device for a new energy vehicle hydrogen system according to claim 8, characterized in that the second calculation module calculates a hydrogen gas volume fraction after the hydrogen system adds hydrogen gas according to the following formula:
wherein N isHnVolume fraction of hydrogen after n-th hydrogenation of hydrogen system, ZNDnHydrogen compression factor, P, before the nth hydrogen addition in a hydrogen systemHDnCylinder pressure, T, before the nth hydrogen addition in a hydrogen systemHDnCylinder temperature, Z, before the nth hydrogen addition in a hydrogen systemNGnHydrogen compression factor, P, after the nth hydrogenation of a hydrogen systemHGnThe cylinder pressure, T, after the nth hydrogenation of the hydrogen systemHGnThe cylinder temperature after the nth hydrogenation of the hydrogen system, NHn-1Is the volume fraction of hydrogen after the N-1 th hydrogenation of the hydrogen system, and NH0＝0。
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