CN114136559A - Full-automatic pressure maintaining and leakage detecting method and device for gas of fuel cell vehicle - Google Patents
Full-automatic pressure maintaining and leakage detecting method and device for gas of fuel cell vehicle Download PDFInfo
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- CN114136559A CN114136559A CN202111199939.1A CN202111199939A CN114136559A CN 114136559 A CN114136559 A CN 114136559A CN 202111199939 A CN202111199939 A CN 202111199939A CN 114136559 A CN114136559 A CN 114136559A
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- 239000000446 fuel Substances 0.000 title claims abstract description 82
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- 239000007789 gas Substances 0.000 claims abstract description 187
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000001257 hydrogen Substances 0.000 claims abstract description 29
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 29
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- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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Abstract
The invention discloses a method and a device for full-automatic pressure maintaining and leakage detection of gas of a fuel cell vehicle, wherein the device comprises: the device comprises a supercharger, a detection assembly, a PLC controller and a filling gun; wherein the supercharger is controlled by the PLC to perform stepped supercharging; in each pressurizing stage, the pressurizer is used for filling pressure maintaining gas into a pipeline of the hydrogen storage system of the fuel cell vehicle to a corresponding preset pressure in combination with the filling gun; the detection assembly is used for detecting the temperature value and the pressure value of the pipeline gas before and after a preset pressure maintaining time period; the PLC determines a first pressure drop value based on pressure values of the pipeline gas before and after a preset pressure maintaining time period; determining a second pressure drop value influenced by temperature change based on temperature values of the pipeline gas before and after a preset pressure maintaining time period; and judging whether the fuel cell vehicle reaches the qualified standard of pressure maintaining and leak detection by comparing the first pressure drop value with the second pressure drop value.
Description
Technical Field
The invention relates to the field of new energy automobile detection, in particular to a full-automatic pressure maintaining and leakage detecting method and device for gas of a fuel cell vehicle.
Background
With the popularization of new energy automobiles, fuel cell vehicles, particularly hydrogen fuel cell vehicles, can meet the environmental protection requirement that the emission is almost zero, so that the fuel cell vehicles can be more and more widely applied to the field of new energy automobiles. In the production process of the fuel cell vehicle, in order to ensure the driving safety, the pressure maintaining and leakage detecting test must be carried out on the pipeline of the hydrogen storage system of the fuel cell vehicle so as to ensure that the gas leakage condition cannot occur at each connecting point of the pipeline connection of the hydrogen storage system.
At present, the pressure maintaining and leakage detecting of a fuel cell automobile are all in a manual detection mode with lower working efficiency, and the temperature change of gas in a pipeline during pressure maintaining and leakage detecting in actual work is not considered. For example, the pipeline may have gas temperature rise when being filled with gas, but the gas temperature gradually decreases during the pressure maintaining process. Because this temperature variation can influence the gas pressure drop value in the pipeline and change, consequently, if neglect the temperature variation and cause the erroneous judgement to pressurize leak hunting result easily to the influence of gas pressure drop, lead to leak hunting work accuracy to reach the production requirement, can't satisfy the market demand.
Therefore, how to accurately and efficiently perform pressure maintaining and leakage detection on the pipeline is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention provides a full-automatic pressure maintaining and leakage detecting method and device for gas of a fuel cell vehicle, and aims to solve or partially solve the technical problems that the existing pressure maintaining and leakage detecting method for the fuel cell vehicle is low in detection efficiency and prone to misjudgment.
In order to solve the technical problem, the invention provides a full-automatic pressure maintaining and leakage detecting device for gas of a fuel cell vehicle, which comprises: the device comprises a supercharger, a detection assembly, a PLC controller and a filling gun;
wherein the supercharger is controlled by the PLC to perform stepped supercharging;
in each of the pressure-increasing stages, the pressure-increasing stage,
the pressurizer is used for combining the filling gun to fill pressure maintaining gas into a pipeline of the hydrogen storage system of the fuel cell vehicle to a corresponding preset pressure;
the detection assembly is used for detecting the temperature value and the pressure value of the pipeline gas before and after a preset pressure maintaining time period;
the PLC determines a first pressure drop value based on pressure values of the pipeline gas before and after a preset pressure maintaining time period; determining a second pressure drop value influenced by temperature change based on temperature values of the pipeline gas before and after a preset pressure maintaining time period; and judging whether the fuel cell vehicle reaches the qualified standard of pressure maintaining and leak detection by comparing the first pressure drop value with the second pressure drop value.
Preferably, the detection assembly comprises: a positive displacement flow meter, a temperature sensor, a pressure sensor; the positive displacement flowmeter, the temperature sensor and the pressure sensor are respectively arranged on a gas conveying pipeline connected with the filling gun and are respectively connected with the PLC;
the positive displacement flowmeter is used for detecting the volume of the pressure maintaining gas injected into a pipeline of the hydrogen storage system of the fuel cell vehicle;
the temperature sensor is used for detecting the temperature values of the pipeline gas before and after the preset pressure maintaining time period;
and the pressure sensor is used for detecting the pressure values of the pipeline gas before and after the preset pressure maintaining time period.
Preferably, the PLC controller is specifically configured to:
calculating formula Delta P according to the pressure difference1＝P10-P20Determining the first pressure drop value; wherein, Δ P1Is the first pressure drop value, P10Is the pressure value, P, of the pipeline gas before the preset pressure maintaining time period20The pressure value of the pipeline gas after a preset pressure maintaining time period is obtained;
according to the ideal gas state equation Delta P2＝(nRT10/V)-(nRT20V) determining the second pressure drop value; wherein, Δ P2N is the amount of the material of the holding gas, and R is the number of moles of the holding gasSpecific value of gas constant, T10The temperature value T of the pipeline gas before the preset pressure maintaining time period20And V is the temperature value of the pipeline gas after a preset pressure maintaining time period, and is the volume of the pressure maintaining gas.
Preferably, the PLC controller is specifically configured to:
comparing the first pressure drop value DeltaP1And said second pressure drop value Δ P2；
If Δ P1＝△P2And + delta, wherein delta is a preset allowable deviation range, and the fuel cell vehicle hydrogen storage system is judged to have no leakage point when each pipeline is connected, and the pressure maintaining leakage detection is qualified.
Preferably, a solenoid valve assembly is further arranged on the gas conveying pipeline connected with the filling gun, and the solenoid valve assembly receives the control of the PLC and is used for cutting off or opening the gas flow of the pipeline where the solenoid valve assembly is located.
Preferably, the solenoid valve assembly includes: the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are in one-to-one correspondence with the first manual stop valve, the second manual stop valve and the third manual stop valve;
the first electromagnetic valve and the first manual stop valve are arranged on the gas conveying pipeline connected with the filling gun;
the second electromagnetic valve and the second manual stop valve are arranged on a first branch pipeline connected to the gas conveying pipeline, a first one-way valve is arranged on the first branch pipeline below the second electromagnetic valve and the second manual stop valve, and the first one-way valve is used for preventing gas in the first branch pipeline from flowing backwards;
the third electromagnetic valve and the third manual stop valve are arranged on a second branch pipeline electrically connected with the fuel cell vehicle, and a second check valve is arranged on the second branch pipeline below the third electromagnetic valve and the third manual stop valve and used for preventing gas on the second branch pipeline from flowing backwards;
preferably, a pressure regulating valve is arranged at the end emptying port close to the first branch pipeline and the second branch pipeline, and is used for regulating the gas pressure exhausted from the first branch pipeline and the second branch pipeline.
Preferably, the apparatus further comprises:
and the first indicator lamp is connected with the PLC and used for lighting and reminding when the pressure maintaining leakage detection is qualified.
And the second indicator light is connected with the PLC and used for lighting and reminding when the pressure maintaining leakage detection is unqualified.
The invention provides a full-automatic pressure maintaining and leakage detecting method for gas of a fuel cell vehicle, which comprises the following steps:
controlling a supercharger to perform stepped supercharging;
in each pressurizing stage, controlling a pressurizer to combine with a filling gun to fill pressure maintaining gas into a pipeline of a hydrogen storage system of the fuel cell vehicle to a corresponding preset pressure;
receiving temperature values and pressure values of the pipeline gas detected by the detection component before and after a preset pressure maintaining time period;
determining a first pressure drop value based on pressure values of the pipeline gas before and after a preset pressure maintaining time period;
determining a second pressure drop value caused by the influence of temperature change on the pressure maintaining gas based on temperature values of the pipeline gas before and after a preset pressure maintaining time period;
and judging whether the fuel cell vehicle reaches the qualified standard of pressure maintaining and leak detection by comparing the first pressure drop value with the second pressure drop value.
Preferably, the method further comprises:
judging whether the current pressure of the pressure maintaining gas reaches a highest detection pressure value;
and if not, controlling the supercharger to perform supercharging in the next supercharging stage.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention discloses a full-automatic pressure maintaining and leakage detecting method and device for gas of a fuel cell vehicle. And the pressure maintaining and leakage detecting calculation is carried out by combining the detection component and the PLC. Therefore, the pressure maintaining and leak detecting method and device can solve the problem of low pressure maintaining and replacing efficiency and improve the pressure maintaining and leak detecting efficiency by reasonably designing the arrangement framework and the control logic of various parts. In addition, when the calculation of pressurize leak hunting is carried out, the influence that the temperature variation that the gas in the pipeline takes place caused the pressure drop value when pressurize leak hunting has been fully considered, through the influence of the gas temperature variation to the pressure drop in the combination consideration pipeline, whether comprehensive judgement pipeline junction has the leak source, whether more accurate judgement has the leak source.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram illustrating a gas full-automatic pressure-maintaining leak detection device of a fuel cell vehicle according to an embodiment of the invention;
fig. 2 shows a flow chart of a method for detecting leakage of a fuel cell vehicle by full-automatic pressure maintaining of gas according to an embodiment of the invention.
Description of reference numerals: the automatic control system comprises a pressure gauge 1, a filter 2, a supercharger 3, a first electromagnetic valve 4, a first manual stop valve 5, a positive displacement flowmeter 6, a pressure sensor 7, a temperature sensor 8, a filling gun 9, a PLC (programmable logic controller) 10, a start-stop switch 11, an emergency stop switch 12, a first indicator lamp 13, a second indicator lamp 14, a fuel cell vehicle 15, a second electromagnetic valve 16, a second manual stop valve 17, a first check valve 18, a third electromagnetic valve 19, a third manual stop valve 20, a second check valve 21 and a pressure regulating valve 22.
Detailed Description
In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the technical solution of the present invention is described in detail below by way of specific embodiments with reference to the attached drawings.
The method aims to solve the technical problems that the existing pressure maintaining and leakage detecting method for the fuel cell automobile is low in detection efficiency and prone to misjudgment. The embodiment of the invention discloses a full-automatic pressure maintaining and leakage detecting method and device for gas of a fuel cell vehicle. The full-automatic accurate efficient pressure maintaining leakage detection can be realized to the problem of whether there is the leakage point in pipeline junction.
For detailed explanation and explanation of the present invention, reference is made to fig. 1, and an embodiment of the present invention discloses a full-automatic pressure-maintaining and leak-detecting device for gas of a fuel cell vehicle. In this embodiment, a leak point may exist at one or some connection points on each pipeline of the hydrogen storage system of the fuel cell vehicle, so the device of this embodiment is used for performing pressure-maintaining leak detection on each pipeline of the hydrogen storage system of the fuel cell vehicle to determine whether there is a leak point in each pipeline of the hydrogen storage system.
In a specific structure, the device comprises a filling gun 9, a supercharger 3 and a detection assembly which are arranged on a gas conveying pipeline, and a PLC (programmable logic controller) 10 which is respectively and electrically connected with the supercharger 3 and the detection assembly.
And the gas conveying pipeline is used for conveying pressure maintaining gas. Preferably, the gas delivery line may be a high pressure hose, and the pressure maintaining gas is an inert gas. Specifically, one end of the gas delivery pipeline is connected to a gas source (such as a container grid, a pipe network, etc.) for storing inert gas, and the other end of the gas delivery pipeline is mechanically connected to a gas receiving head on the fuel cell vehicle 15 through a filling gun 9, so that the inert gas is filled into a pipeline of a hydrogen storage system of the fuel cell vehicle. Because when carrying out pressurize leak hunting to the pipeline of fuel cell car hydrogen storage system, need carry out the pressure boost to this pipeline, so this embodiment is provided with booster 3 at gas conveying pipeline, combines filling gun 9 to carry out cascaded pressure boost to this pipeline to in every cascaded pressure boost stage, with gaseous to the corresponding preset pressure of pressurize of filling in the pipeline of fuel cell car hydrogen storage system. In order to solve the problem of low efficiency of manual pressure maintaining leakage detection, the supercharger 3 in the embodiment is controlled by the PLC 10 to perform stepped supercharging, full-automatic stepped supercharging is realized by combining the supercharger 3 and the PLC 10, and preparation work for pressure maintaining leakage detection can be quickly and safely performed.
Further, this embodiment still is provided with the determine module on the gas transmission pipeline for in every pressure boost stage, detect the gaseous temperature value and the pressure value around predetermineeing the pressurize time quantum in the detection pipeline, determine module electric connection PLC controller 10 to the temperature value and the pressure value around the pressurize time quantum are predetermine in the transmission give PLC controller 10, provide data support for the pressurize leak hunting of PLC controller 10.
The PLC 10 determines a first pressure drop value based on pressure values of the pipeline gas before and after a preset pressure maintaining time period in each pressurizing stage; determining a second pressure drop value influenced by temperature change based on temperature values of the pipeline gas before and after a preset pressure maintaining time period; and judging whether the fuel cell vehicle 15 reaches the qualified standard of pressure maintaining and leakage detecting by comparing the first pressure drop value with the second pressure drop value. Of course, the PLC controller 10 performs the above-described operation at each pressurization stage. Therefore, the PLC controller 10 performs stepped pressurization and stepped pressure maintaining leak detection on the pipeline to avoid damage to the pipeline or corresponding parts due to excessive pressurization of the air pressure. In addition, can also progressively carry out the pressure boost to the pipeline with whether there is the leak point under its present stage atmospheric pressure to atmospheric pressure data when can determining that the pipeline has the leak point provides the basis for follow-up improvement.
The above embodiment introduces the relevant structure of the full-automatic pressure-maintaining and leakage-detecting device for gas of the fuel cell vehicle 15, and the full-automatic stepped pressurization is realized quickly and efficiently by combining the supercharger 3 and the PLC controller 10, so that the efficiency of pressure-maintaining and leakage-detecting is improved. In addition, the influence of the temperature change of pipeline gas on the pressure drop value is considered in the pressure maintaining and leakage detecting process of each pressurizing stage by combining the related detection data of the detection assembly, so that the pressure maintaining and leakage detecting result is more accurate. Therefore, the device of the embodiment can accurately and efficiently carry out pressure maintaining and leakage detecting on the pipeline of the hydrogen storage system of the fuel cell vehicle.
In order to further illustrate and explain the present invention, the following examples illustrate the relevant components in detail.
In the present embodiment, the supercharger 3 is controlled by the PLC controller 10. The gas source device has the specific function of performing stepped pressurization on the pipeline by using an inert gas source (such as container grids, pipe networks and the like) connected with a gas conveying pipeline. In addition, a pressure gauge 1, a filter 2 and the like are provided in the gas delivery line. The position of the pressure gauge 1 can be arbitrarily set, for example, the pressure gauge 1 is arranged at the front and the rear of the supercharger 3 to monitor the relative pressure of the pressure maintaining gas at the front and the rear of the supercharger 3. And the filter 2 is used for filtering impurities that may be contained in the gas.
It should be noted that the pipeline of this embodiment corresponds to the highest pressure value. The maximum pressure value is the limit pressure that the pipeline can withstand. If the pressure in the pipeline exceeds the highest pressure value of the embodiment, the pipeline may burst, etc. Therefore, in order to ensure the safety of the pipeline, the stepped pressurization is carried out at the highest pressure value in the embodiment.
In each pressurizing stage of the stepped pressurization, the pressurizer 3 is used for filling pressure maintaining gas into a pipeline of the hydrogen storage system of the fuel cell vehicle to a corresponding preset pressure in combination with the filling gun 9.
Since the PLC controller 10 is provided with a corresponding preset pressure in each pressurizing stage, and one pressurizing stage corresponds to one preset pressure. The pipeline gas can be pressurized to a corresponding preset pressure in each pressurizing stage by controlling the pressurizer 3, so that preparation is made for subsequent pressure maintaining and leakage detecting work. The PLC controller 10 will be described in detail later, and will not be described in detail here.
After the supercharger 3 supercharges the pipeline gas to the preset pressure, the pipeline gas can be subjected to pressure maintaining within the preset pressure maintaining time period. In this embodiment, the detection component is required to detect the related temperature value and pressure value before and after the preset pressure maintaining time period.
Specifically, the detection assembly of the present embodiment includes a positive displacement flow meter 6, a temperature sensor 8, and a pressure sensor 7. The positive displacement flowmeter 6, the temperature sensor 8 and the pressure sensor 7 are respectively arranged on a gas conveying pipeline connected with the filling gun 9 and are respectively connected with a PLC (programmable logic controller) 10.
Further, the volumetric flowmeter 6 is configured to detect the volume of the pressure maintaining gas injected into the pipeline of the hydrogen storage system of the fuel cell vehicle. And the temperature sensor 8 is used for detecting the temperature values of the pipeline gas before and after a preset pressure maintaining time period. And the pressure sensor 7 is used for detecting the pressure values of the pipeline gas before and after a preset pressure maintaining time period.
Further, the detection component transmits the detected relevant numerical value to the PLC controller 10, so as to provide accurate data support for calculating the pressure drop value of the pipeline gas.
In the PLC controller 10, it is necessary to calculate a first pressure drop value and a second pressure drop value according to the detected correlation values, and perform pressure-maintaining leak detection based on the first pressure drop value and the second pressure drop value.
In a specific implementation process, a first pressure drop value is determined based on pressure values of the pipeline gas before and after a preset pressure maintaining time period. Specifically, Δ P is set1Is a first pressure drop value, wherein P10The pressure value of the pressure maintaining gas before the preset pressure maintaining time period，P20The pressure value of the pressure maintaining gas after the preset pressure maintaining time period is calculated according to the pressure difference calculation formula delta P1＝P10-P20A first pressure drop value is determined.
In a specific implementation process, a second pressure drop value of the pressure maintaining gas affected by temperature change is determined based on temperature values of the pipeline gas before and after a preset pressure maintaining time period. Specifically, Δ P is set2Is a second pressure drop value, n is the amount of the material of the holding gas, R is the molar gas constant of the holding gas, wherein T10Is the temperature value T of the pipeline gas before the preset pressure maintaining time period20The temperature value of the pipeline gas after the preset pressure maintaining time period is shown, and V is the volume of the pressure maintaining gas. According to the ideal gas state equation DeltaP2＝(nRT10/V)-(nRT20/V)A second pressure drop value affected by the temperature change is determined. According to the equation, the temperature of the pipeline gas along with the time change is considered in the pressure drop, and the influence of the temperature change of the pipeline gas on the pressure drop is considered in combination, so that whether the leakage point exists at the pipeline joint or not is comprehensively judged, and whether the leakage point exists or not can be accurately judged.
Further, the PLC controller 10 compares the first pressure drop value Δ P1And a second pressure drop value DeltaP2If Δ P is satisfied1＝△P2And if delta is a preset allowable deviation range, judging that no leakage point exists in each pipeline connection of the hydrogen storage system of the fuel cell vehicle, and keeping pressure and detecting leakage to be qualified. As an alternative embodiment, the preset allowable deviation of δ is taken to be within the range of [ -5%, 5% ]]But are not intended to be limiting.
Further, if the above-mentioned Δ P is not satisfied1＝△P2And if the + delta condition is met, determining that each pipeline of the hydrogen storage system of the fuel cell vehicle is connected with a leakage point, and maintaining pressure and detecting leakage are unqualified.
In addition to the above-described detection assembly, the present embodiment further includes a solenoid valve assembly that receives the control of the PLC controller 10 and serves to cut off or open the flow of the line gas in the corresponding line.
In this embodiment, the solenoid valve assembly includes: the first electromagnetic valve 4, the second electromagnetic valve 16 and the third electromagnetic valve 19 correspond to the first manual stop valve 5, the second manual stop valve 17 and the third manual stop valve 20 one by one.
Specifically, the first electromagnetic valve 4 and the first manual shutoff valve 5 are provided in a gas transfer line connected to the filling gun 9. Specifically, the PLC controller 10 can control the first solenoid valve 4 to shut off or open the flow of the line gas on the gas delivery line connected to the filling gun 9, and the first manual cut-off valve 5 is used as a backup valve in the event of a circuit failure.
The second electromagnetic valve 16 and the second manual stop valve 17 are arranged on a first branch pipeline connected to the gas conveying pipeline, a first check valve 18 is arranged on the first branch pipeline below the second electromagnetic valve 16 and the second manual stop valve 17, and the first check valve 18 is used for preventing gas in the first branch pipeline from flowing backwards. Specifically, when the gas in the gas conveying pipeline needs to be exhausted, the gas in the corresponding gas conveying pipeline is exhausted from the first branch pipeline.
The third electromagnetic valve 19 and the third manual stop valve 20 are disposed on a second branch pipeline electrically connected to the fuel cell vehicle 15, and a second check valve 21 is installed on the second branch pipeline below the third electromagnetic valve 19 and the third manual stop valve 20, and the second check valve 21 is used for preventing gas on the second branch pipeline from flowing backwards. Specifically, when the pressure-maintaining leak detection operation of the fuel cell vehicle 15 is completed, the pressure-maintaining gas in the fuel cell vehicle 15 is discharged from the second branch pipe.
Further, in the present embodiment, a pressure regulating valve 22 is disposed at the end evacuation ports near the first branch pipeline and the second branch pipeline, and is used for regulating the gas pressure discharged from the first branch pipeline and the second branch pipeline, so as to meet the gas discharge requirement of safe production.
In order to carry out visual warning to the pressurize leak hunting, in this embodiment, still include: a first indicator light 13 and a second indicator light 14. The two indicator lights are controlled by the PLC controller 10.
Specifically, when the fuel cell vehicle 15 is qualified for pressure maintaining leak detection, the first indicator lamp 13 is turned on to prompt. When the fuel cell vehicle 15 is unqualified in pressure maintaining and leak detection, the second indicator lamp 14 is turned on to remind.
As an alternative embodiment, the PLC controller 10 is further electrically connected with a start-stop switch 11 and an emergency stop switch 12. Open when needing to carry out pressurize leak hunting to the pipeline of fuel cell car hydrogen storage system, open through opening and stop switch 11 and use this device to accurate efficient accomplishes pressurize leak hunting work. And the emergency stop switch 12 can be used to stop the operation in any event.
As an alternative embodiment, the PLC controller 10 is further configured to, after determining whether the fuel cell vehicle 15 meets the pressure-maintaining leak-detecting qualified standard, further determine whether the current pressure of the pressure-maintaining gas reaches the highest detection pressure value if the fuel cell vehicle 15 is qualified for pressure-maintaining leak detection. If not, the supercharger 3 is controlled to perform supercharging in the next supercharging stage, so that the pipeline is gradually supercharged under the highest pressure value to accurately judge whether a leakage point exists under the current stage air pressure.
Based on the same inventive concept as the previous embodiment, the embodiment of the present invention further discloses a full-automatic pressure maintaining and leak detecting method for gas of the fuel cell vehicle 15, and for the purpose of describing and explaining the embodiment in detail, please refer to fig. 2, wherein the method includes the following steps:
step 201: and in each step-type pressurization stage, controlling the pressurizer 3 to fill pressure maintaining gas into a pipeline of the hydrogen storage system of the fuel cell vehicle to a corresponding preset pressure in combination with the filling gun 9.
As an optional embodiment, when pressure maintaining and leakage detecting are required to be performed on a pipeline of a hydrogen storage system of a fuel cell vehicle, a worker presses the start-stop switch 11, and when the PLC controller 10 receives a start signal of the start-stop switch 11, stepped pressurization is performed.
As an alternative embodiment, when the stepwise pressurization is started, taking the first pressurization stage as an example, the PLC controller 10 controls to open the first electromagnetic valve 4 on the gas delivery pipeline, and controls the pressurizer 3 to fill the pressure maintaining gas for the pressurization stage into the pipeline of the hydrogen storage system of the fuel cell vehicle in combination with the filling gun 9.
Further, the control booster 3 is combined with the filling gun 9 to boost the pipeline in the current boosting stage, and the pressure maintaining gas is boosted to the corresponding preset pressure. In addition, each pressure gauge 1 on the gas conveying pipeline can display the pressure value for pressurizing the pipeline at the current stage for reference.
Step 202: and receiving temperature values and pressure values of the pipeline gas detected by the detection component before and after a preset pressure maintaining time period.
As an alternative embodiment, after pressurization, the pressure maintaining gas in the pipeline is maintained for a preset pressure maintaining time period.
Further, the temperature value and the pressure value of the pipeline gas at the beginning of the preset pressure maintaining time period are detected by controlling the detection component and transmitted to the PLC 10.
Further, after the pressure maintaining is completed, the control detection component detects the current temperature value and the current pressure value of the pipeline gas again and transmits the temperature value and the pressure value to the PLC 10. After receiving the relevant parameters, the PLC controller 10 performs the following steps.
Step 203, determining a first pressure drop value based on the pressure values of the pipeline gas before and after a preset pressure maintaining time period.
In a specific implementation, the PLC controller 10 may set Δ P1Is the first pressure drop value.
Specifically, the PLC controller 10 determines the pressure value of the pressurized gas before the preset pressure maintaining time period and sets the pressure value as P according to the pressure values of the received pipeline gas transmitted by the detection module before and after the preset pressure maintaining time period10Determining the pressure value of the pressure maintaining gas after the preset pressure maintaining time period and setting the pressure value as P20。
Further, the formula Δ P is calculated according to the pressure difference1＝P10-P20A first pressure drop value is determined.
And 204, determining a second pressure drop value caused by the influence of temperature change on the pressure maintaining gas based on the temperature values of the pipeline gas before and after the preset pressure maintaining time period.
In a specific implementation, the PLC controller 10 may set Δ P2Is the second pressure drop value. n is the amount of the substance of the pressure maintaining gas, and R is the molar gas constant of the pressure maintaining gas.
Specifically, the PLC controller 10 determines the temperature value of the pressure maintaining gas before the preset pressure maintaining time period and sets the temperature value as T according to the temperature values of the pipeline gas before and after the preset pressure maintaining time period received from the detection module10Determining the temperature value of the pressure maintaining gas after the preset pressure maintaining time period and setting the temperature value as T20. The reading of the positive displacement flowmeter 6 at the current pressurization stage is taken to determine the volume of the pressurization gas and set as V.
Further, according to the ideal gas state equation Delta P2＝(nRT10/V)-(nRT20V) determining a second pressure drop value caused by the influence of the temperature change. The above equation considers the temperature of the line gas over time in pressure drop by combining the temperature of the line gasThe influence of the change on the pressure drop is used for comprehensively judging whether leakage points exist at the pipeline connection part, and whether the leakage points exist can be judged more accurately.
And step 205, comparing the first pressure drop value with the second pressure drop value to judge whether the fuel cell vehicle 15 meets the qualified standard of pressure maintaining and leak detection.
In a specific implementation, the PLC controller 10 compares the first pressure drop value Δ P1 calculated by the above formula with the second pressure drop value Δ P2.
Further, it is determined if the contrast satisfies Δ P1＝△P2And if delta is a preset allowable deviation range, judging that no leakage point exists in each pipeline connection of the hydrogen storage system of the fuel cell vehicle, and keeping pressure and detecting leakage to be qualified.
As an alternative embodiment, the preset allowable deviation of δ is taken to be in the range of [ -5%, 5% ], but not limiting.
Further, determining if the contrast does not satisfy the above-mentioned Δ P1＝△P2And if the + delta condition is met, determining that each pipeline of the hydrogen storage system of the fuel cell vehicle is connected with a leakage point, and maintaining pressure and detecting leakage are unqualified.
In a specific implementation process, when the pressure maintaining and leakage detecting work of the fuel cell vehicle 15 is completed, if the pressure maintaining and leakage detecting work is qualified in the current pressurization stage, the first indicator lamp 13 is turned on to remind.
Further, the fuel cell vehicle 15 is subjected to pressure maintaining leak detection in the next step.
If the pressure maintaining and leakage detecting in the current pressurization stage are unqualified, the second indicator lamp 14 is turned on to remind, and it is indicated that the pipeline connection has a leakage point in the current pressurization stage.
And further, confirming the leakage point and entering subsequent leakage point processing work.
As an alternative example, after determining whether the fuel cell vehicle 15 has reached the pressure holding leak detection qualified standard, it is further determined whether the current pressure of the pressure holding gas has reached the detection maximum pressure value.
In a specific implementation process, after the fuel cell vehicle 15 is determined to be qualified through the pressure maintaining and leakage detecting operation, it is further determined whether the current pressure of the pressure maintaining gas reaches the highest detection pressure value. If not, the PLC 10 controls the supercharger 3 to perform supercharging in the next supercharging stage and repeats the pressure maintaining and leakage detecting working steps until the current pressure is judged to reach the highest detection pressure value. If yes, the process is finished.
Further, in each pressurizing stage of the stepped pressurization, the highest pressure value of the fuel cell vehicle 15 is determined by performing the step-by-step pressurization on the pipeline gas, and the pipeline is gradually pressurized under the highest pressure value to accurately judge whether a leakage point exists under the current stage gas pressure.
In a specific implementation process, according to the pressure maintaining and leakage detecting work requirement, if the gas in the gas conveying pipeline needs to be exhausted, the PLC controller 10 electrically controls the second electromagnetic valve 16 to exhaust the gas in the gas conveying pipeline from the first branch pipeline; if the pressure maintaining and leakage detecting work of the fuel cell vehicle 15 is finished, the PLC controller 10 electrically controls the third electromagnetic valve 19 to discharge the pressure maintaining gas in the fuel cell vehicle 15 from the second branch pipe, and regulates the gas pressure discharged from the first branch pipe and the second branch pipe by the pressure regulating valve 22 to safely discharge the gas. The working principle and function of the solenoid valve assembly are referred to herein, and are not described herein again with reference to the above detailed description.
Further, in the case where a problem occurs at any stage during the implementation of the embodiment, the PLC controller 10 immediately stops the operation by receiving and controlling the emergency stop switch 12, so as to protect the facility from damage.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention discloses a full-automatic pressure maintaining and leakage detecting method and device for gas of a fuel cell vehicle. And the pressure maintaining and leakage detecting calculation is carried out by combining the detection component and the PLC. Therefore, the pressure maintaining and leak detecting method and device can solve the problem of low pressure maintaining and replacing efficiency and improve the pressure maintaining and leak detecting efficiency by reasonably designing the arrangement framework and the control logic of various parts. In addition, when the calculation of pressurize leak hunting is carried out, the influence that the temperature variation that the gas in the pipeline takes place caused the pressure drop value when pressurize leak hunting has been fully considered, through the influence of the gas temperature variation to the pressure drop in the combination consideration pipeline, whether comprehensive judgement pipeline junction has the leak source, whether more accurate judgement has the leak source.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a full-automatic pressurize of gas leak hunting device of fuel cell car which characterized in that, the device includes: the device comprises a supercharger, a detection assembly, a PLC controller and a filling gun;
wherein the supercharger is controlled by the PLC to perform stepped supercharging;
in each of the pressure-increasing stages, the pressure-increasing stage,
the pressurizer is used for combining the filling gun to fill pressure maintaining gas into a pipeline of the hydrogen storage system of the fuel cell vehicle to a corresponding preset pressure;
the detection assembly is used for detecting the temperature value and the pressure value of the pipeline gas before and after a preset pressure maintaining time period;
the PLC determines a first pressure drop value based on pressure values of the pipeline gas before and after a preset pressure maintaining time period; determining a second pressure drop value influenced by temperature change based on temperature values of the pipeline gas before and after a preset pressure maintaining time period; and judging whether the fuel cell vehicle reaches the qualified standard of pressure maintaining and leak detection by comparing the first pressure drop value with the second pressure drop value.
2. The full-automatic gas pressure-maintaining and leakage-detecting device for the fuel cell vehicle as claimed in claim 1, wherein the detecting component comprises: a positive displacement flow meter, a temperature sensor, a pressure sensor; the positive displacement flowmeter, the temperature sensor and the pressure sensor are respectively arranged on a gas conveying pipeline connected with the filling gun and are respectively connected with the PLC;
the positive displacement flowmeter is used for detecting the volume of the pressure maintaining gas injected into a pipeline of the hydrogen storage system of the fuel cell vehicle;
the temperature sensor is used for detecting the temperature values of the pipeline gas before and after the preset pressure maintaining time period;
and the pressure sensor is used for detecting the pressure values of the pipeline gas before and after the preset pressure maintaining time period.
3. The full-automatic pressure maintaining and leakage detecting device for the gas of the fuel cell vehicle as claimed in claim 2, wherein the PLC controller is specifically configured to:
calculating formula Delta P according to the pressure difference1＝P10-P20Determining the first pressure drop value; wherein, Δ P1Is the first pressure drop value, P10Is the pressure value, P, of the pipeline gas before the preset pressure maintaining time period20The pressure value of the pipeline gas after a preset pressure maintaining time period is obtained;
according to the ideal gas state equation Delta P2＝(nRT10/V)-(nRT20V) determining the second pressure drop value; wherein, Δ P2N is the amount of the substance of the holding gas, R is the molar gas constant of the holding gas, and T is the second pressure drop value10The temperature value T of the pipeline gas before the preset pressure maintaining time period20The temperature value of the pipeline gas after a preset pressure maintaining time period is shown, V is the body of the pressure maintaining gasAnd (4) accumulating.
4. The full-automatic pressure maintaining and leakage detecting device for the gas of the fuel cell vehicle as claimed in claim 3, wherein the PLC is specifically configured to:
comparing the first pressure drop value DeltaP1And said second pressure drop value Δ P2；
If Δ P1＝△P2And + delta, wherein delta is a preset allowable deviation range, and the fuel cell vehicle hydrogen storage system is judged to have no leakage point when each pipeline is connected, and the pressure maintaining leakage detection is qualified.
5. The full-automatic gas pressure-maintaining and leakage-detecting device for the fuel cell vehicle as claimed in claim 1, wherein a solenoid valve assembly is further provided on the gas delivery pipe connected to the filling gun, the solenoid valve assembly receiving the control of the PLC controller and being configured to cut off or open the gas flow in the pipe.
6. The full-automatic gas pressure-maintaining and leakage-detecting device for the fuel cell vehicle as claimed in claim 5, wherein the solenoid valve assembly comprises: the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are in one-to-one correspondence with the first manual stop valve, the second manual stop valve and the third manual stop valve;
the first electromagnetic valve and the first manual stop valve are arranged on the gas conveying pipeline connected with the filling gun;
the second electromagnetic valve and the second manual stop valve are arranged on a first branch pipeline connected to the gas conveying pipeline, a first one-way valve is arranged on the first branch pipeline below the second electromagnetic valve and the second manual stop valve, and the first one-way valve is used for preventing gas in the first branch pipeline from flowing backwards;
the third electromagnetic valve and the third manual stop valve are arranged on a second branch pipeline electrically connected with the fuel cell vehicle, a second one-way valve is installed on the second branch pipeline below the third electromagnetic valve and the third manual stop valve, and the second one-way valve is used for preventing gas on the second branch pipeline from flowing backwards.
7. The apparatus of claim 6, wherein a pressure regulating valve is disposed near the end exhaust ports of the first branch line and the second branch line for regulating the pressure of the gas exhausted from the first branch line and the second branch line.
8. The full-automatic pressure-maintaining and leakage-detecting device for the gas of the fuel cell vehicle as claimed in claim 1, wherein the device further comprises:
the first indicator light is connected with the PLC and used for lighting reminding when the pressure maintaining leakage detection is qualified;
and the second indicator light is connected with the PLC and used for lighting and reminding when the pressure maintaining leakage detection is unqualified.
9. A full-automatic pressure maintaining and leakage detecting method for gas of a fuel cell vehicle is characterized by comprising the following steps:
in each step-type pressurization stage, controlling a pressurizer to combine with a filling gun to fill pressure-maintaining gas into a pipeline of a hydrogen storage system of the fuel cell vehicle to a corresponding preset pressure;
receiving temperature values and pressure values of the pipeline gas detected by the detection component before and after a preset pressure maintaining time period;
determining a first pressure drop value based on pressure values of the pipeline gas before and after a preset pressure maintaining time period;
determining a second pressure drop value caused by the influence of temperature change on the pressure maintaining gas based on temperature values of the pipeline gas before and after a preset pressure maintaining time period;
and judging whether the fuel cell vehicle reaches the qualified standard of pressure maintaining and leak detection by comparing the first pressure drop value with the second pressure drop value.
10. The method of claim 9, wherein after determining whether the fuel cell vehicle meets pressure holding leak detection qualification criteria, the method further comprises:
judging whether the current pressure of the pressure maintaining gas reaches a highest detection pressure value;
and if not, controlling the supercharger to perform supercharging in the next supercharging stage.
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