CN110319985B - Detection system and detection method - Google Patents
Detection system and detection method Download PDFInfo
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- CN110319985B CN110319985B CN201810274316.8A CN201810274316A CN110319985B CN 110319985 B CN110319985 B CN 110319985B CN 201810274316 A CN201810274316 A CN 201810274316A CN 110319985 B CN110319985 B CN 110319985B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- 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
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Abstract
The invention provides a detection system and a detection method, and relates to the technical field of vehicles. The vacuumizing device can be used for extracting gas in a system to be detected after being started, the single-chip microcomputer controller can acquire a vacuum value detected by the vacuum sensor, the vacuumizing device is closed when the vacuum value is smaller than a preset threshold value and does not reduce any more, and the vacuum value smaller than the preset threshold value and does not reduce any more is determined as a first vacuum value; after the first preset time, determining the vacuum value detected by the vacuum sensor as a second vacuum value; and calculating a vacuum value difference value and a vacuum value change rate based on the first vacuum value and the second vacuum value, and judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate. Therefore, the judgment mode based on the vacuum value difference and the vacuum value change rate can reduce the influence of vacuum value rise caused by the system property on the judgment process, and further improve the judgment accuracy.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a detection system and a detection method.
Background
With the continuous development of vehicle technology, the popularity of vehicles is higher and higher, and during the assembly process of vehicles, it is often necessary to fill some systems in the vehicles with vehicle liquids, such as brake liquid, power steering liquid, refrigerant liquid for the braking system of the vehicles, and the like. The tightness of the system to be filled often determines whether the filling operation can be carried out successfully when the filling is carried out. Therefore, how to detect whether the system to be filled has leakage becomes a problem of great concern.
In the prior art, during detection, a fixed threshold is usually set manually according to experience, then a period of vacuum pumping operation is performed on a system to be filled, after the vacuum operation is finished, if the vacuum value of the system to be filled is not less than the fixed threshold, it is considered that leakage exists in the system to be filled, and if the vacuum value of the system to be filled is kept at a level less than the fixed threshold within a preset time period, it is considered that leakage does not exist in the system to be filled.
However, after the evacuation operation is finished, the elastic material element in the system to be filled tends to rebound, so that a pressure boosting process is generated, and the vacuum value of the system to be filled is greater than a fixed threshold value, and the pressure boosting process is caused by the property of the system and is irrelevant to system leakage, so that in the detection mode in the prior art, the phenomenon of misjudgment occurs, and the accuracy of judging the sealing performance is low.
Disclosure of Invention
In view of this, the present invention is directed to a detection system and a detection method, so as to solve the problem of low accuracy in determining the sealing performance of the system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a detection system, comprising: the vacuum pumping device, the vacuum sensor, the single chip microcomputer controller and the connecting pipeline are arranged on the vacuum pumping device;
the vacuumizing device is connected with a system to be tested through the connecting pipeline, the vacuum sensor is arranged on the connecting pipeline, and the single chip microcomputer controller is connected with the vacuumizing device and the vacuum sensor;
the single chip microcomputer controller is used for controlling the vacuumizing device to be started;
the vacuumizing device is used for pumping gas in the tested system after being started;
the vacuum sensor is used for detecting a vacuum value in the system to be tested;
the single chip microcomputer controller is used for acquiring a vacuum value detected by the vacuum sensor; when the vacuum value is smaller than a preset threshold value and is not reduced any more, controlling the vacuumizing device to be turned off, and determining the vacuum value smaller than the preset threshold value and not reduced any more as a first vacuum value; after the first preset time, determining the vacuum value detected by the vacuum sensor as a second vacuum value; and calculating a vacuum value difference value and a vacuum value change rate based on the first vacuum value and the second vacuum value, and judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate.
Further, the system to be tested comprises a first filling port and a second filling port; the connecting pipeline comprises a first pipeline and a second pipeline;
one end of the first pipeline is connected with the first end of the vacuumizing device, and the other end of the first pipeline is connected with a first filling port of the system to be tested; one end of the second pipeline is connected with the second end of the vacuumizing device, and the other end of the second pipeline is connected with a second filling port of the system to be tested;
the vacuum pumping device is a vacuum pump.
Further, the detection system further comprises a first pressure sensor and a second pressure sensor;
the single chip microcomputer controller is connected with the first pressure sensor and the second pressure sensor;
the first pressure sensor is connected with the first filling port and used for detecting the pressure value of the first filling port; the second pressure sensor is connected with the second filling port and used for detecting the pressure value of the second filling port.
Compared with the prior art, the detection system has the following advantages:
in the embodiment of the invention, the single chip microcomputer controller can control the vacuumizing device to be started, the vacuumizing device can extract gas in the system to be tested after the vacuumizing device is started, the single chip microcomputer controller can obtain a vacuum value detected by the vacuum sensor, the vacuumizing device is closed when the vacuum value is smaller than a preset threshold and is not reduced any more, the vacuum value smaller than the preset threshold and not reduced any more is determined as a first vacuum value, then the vacuum value detected by the vacuum sensor is determined as a second vacuum value after a first preset time period, then a vacuum value difference value and a vacuum value change rate are calculated based on the first vacuum value and the second vacuum value, and finally, whether the system to be tested leaks or not is judged according to the vacuum value difference value and the vacuum value change rate. In the embodiment of the invention, the judgment mode is carried out based on the vacuum value difference and the vacuum value change rate, so that the influence of vacuum value rise caused by the property of the system on the judgment process can be reduced, and the judgment accuracy is further improved.
Another objective of the present invention is to provide a detection method to solve the problem of low accuracy in determining the sealing performance of the system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a detection method, which is applied to any one of the detection systems, and which includes:
the vacuumizing device is controlled to be started through the singlechip controller;
after the vacuumizing device is started, gas in the tested system is extracted;
the method comprises the steps that a vacuum value detected by a vacuum sensor is obtained through the single-chip microcomputer controller, when the vacuum value is smaller than a first preset threshold value and is not reduced any more, the vacuumizing device is controlled to be turned off, and the vacuum value which is smaller than the first preset threshold value and is not reduced any more is determined as the first vacuum value;
after the single chip microcomputer controller is in a first preset time period, determining the vacuum value detected by the vacuum sensor as a second vacuum value;
and calculating a vacuum value difference value and a vacuum value change rate by the singlechip controller based on the first vacuum value and the second vacuum value, and judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate.
Further, before the steps of acquiring a vacuum value detected by a vacuum sensor through the single chip microcomputer controller, controlling the vacuum pumping device to be turned off when the vacuum value is smaller than a first preset threshold value and is not reduced any more, and determining the vacuum value smaller than the first preset threshold value and not reduced any more as a first vacuum value, the method further comprises:
after the single-chip microcomputer controller obtains a second preset time length after the vacuumizing device is started, the vacuum value detected by the vacuum sensor obtains a third vacuum value;
if the third vacuum value is not smaller than a second preset threshold value, controlling the vacuumizing device to be closed through the single-chip microcomputer controller, and determining that the tested system has leakage;
if the third vacuum value is smaller than a second preset threshold value, acquiring a vacuum value detected by the vacuum sensor after the vacuumizing device is started for a third preset time through the single-chip microcomputer controller to obtain a fourth vacuum value;
if the fourth vacuum value is not smaller than a third preset threshold value, controlling the vacuumizing device to be closed through the single-chip microcomputer controller, and determining that the tested system has leakage;
and if the fourth vacuum value is smaller than a third preset threshold value, executing the step of acquiring the vacuum value detected by the vacuum sensor through the single-chip microcomputer controller, controlling the vacuumizing device to be closed when the vacuum value is smaller than the first preset threshold value and is not reduced any more, and determining the vacuum value which is smaller than the first preset threshold value and is not reduced any more as the first vacuum value.
Further, the step of calculating, by the single chip microcomputer controller, a vacuum value difference value and a vacuum value change rate based on the first vacuum value and the second vacuum value includes:
calculating the difference of the second vacuum value minus the first vacuum value through the single chip microcomputer controller to obtain a vacuum value difference value;
and calculating the ratio of the vacuum value difference to the first preset time length through the single chip microcomputer controller to obtain the change rate of the vacuum value.
Further, the step of determining whether the system under test has a leak according to the vacuum value difference and the vacuum value change rate includes:
if the vacuum value difference is smaller than a fourth preset threshold value, determining that the tested system does not have leakage through the single chip microcomputer controller;
and if the vacuum value difference value is not smaller than a fourth preset threshold value, determining that the tested system has no leakage through the single chip microcomputer controller when the vacuum value change rate is smaller than a preset change rate threshold value.
Furthermore, the vacuumizing device is connected with a first filling port of the system to be tested through a first pipeline, and the vacuumizing device is connected with a second filling port of the system to be tested through a second pipeline;
the detection system further comprises a first pressure sensor and a second pressure sensor;
the single chip microcomputer controller is connected with the first pressure sensor and the second pressure sensor;
the first pressure sensor is connected with the first filling port and used for detecting the pressure value of the first filling port; the second pressure sensor is connected with the second filling port and used for detecting the pressure value of the second filling port.
Further, before the step of controlling the vacuum pumping device to be started by the single chip microcomputer controller, the method further comprises the following steps of:
when the singlechip controller detects that the vacuumizing device is connected with the system to be tested, acquiring the pressure value of the first filling port and the pressure value of the second filling port;
if the pressure value of the first filling port is not changed compared with the first initial pressure value, first reminding information is sent out through the single chip microcomputer controller; the first reminding information is used for indicating that a first filling port of the tested system has a fault;
if the pressure value of the second filling port is not changed compared with a second initial pressure value, sending second reminding information through the single-chip microcomputer controller; the second reminding information is used for indicating that a second filling port of the tested system has a fault;
and if the pressure value of the first filling port is changed compared with a first initial pressure value and the pressure value of the second filling port is changed compared with a second initial pressure value, executing the step of controlling the vacuumizing device to be opened through the single-chip microcomputer controller.
Another objective of the present invention is to provide a vehicle to solve the problem of low accuracy in determining the sealing performance of the system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle comprising any of the detection systems described above.
Compared with the prior art, the vehicle, the detection method and the detection system have the same advantages, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a detection system according to an embodiment of the present invention;
FIG. 2 is a second schematic diagram of a detection system according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating steps of a detection method according to an embodiment of the present invention;
fig. 4 is a second flowchart illustrating a detection method according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, there is shown one of the schematic diagrams of a detection system of an embodiment of the present invention, which may include: the vacuum extractor 01, the vacuum sensor 02, the single chip microcomputer controller 03 and the connecting pipeline 04.
The vacuumizing device 01 can be connected with the tested system 05 through a connecting pipeline 04, the vacuum sensor 02 can be arranged on the connecting pipeline 04, and the single chip microcomputer controller 03 can be connected with the vacuumizing device 01 and the vacuum sensor 02. The vacuum-pumping device 01 may be a device capable of pumping the system under test 05 into a vacuum environment, and the vacuum-pumping device 01 may be a vacuum pump.
Further, the single chip microcomputer controller 03 can be used for controlling the vacuumizing device 01 to be started, the vacuumizing device 01 can be used for extracting gas in the tested system 05 after being started, and the vacuum sensor 02 is used for detecting a vacuum value in the tested system 05.
In the embodiment of the invention, the vacuum sensor 02 is arranged on the connecting pipeline 04, and the connecting pipeline 04 is communicated with the system 05 to be tested, so that the vacuum value in the connecting pipeline 04 is equal to the vacuum value in the system 05 to be tested, and the vacuum sensor 02 can detect the vacuum value in the system 05 to be tested.
Further, the single chip microcomputer controller 03 is also used for acquiring a vacuum value detected by the vacuum sensor 02; when the vacuum value is smaller than the preset threshold value and is not reduced any more, controlling the vacuumizing device 01 to be closed, and determining the vacuum value which is smaller than the preset threshold value and is not reduced any more as a first vacuum value; after the first preset time, determining the vacuum value detected by the vacuum sensor 02 as a second vacuum value; and calculating a vacuum value difference value and a vacuum value change rate based on the first vacuum value and the second vacuum value, and judging whether the tested system 05 has leakage or not according to the vacuum value difference value and the vacuum value change rate.
In the detection system provided by the embodiment of the invention, the single chip microcomputer controller can control the vacuumizing device to be started, the vacuumizing device can extract gas in the detected system after being started, the single chip microcomputer controller can obtain the vacuum value detected by the vacuum sensor, when the vacuum value is smaller than the preset threshold value and is not reduced any more, the vacuumizing device is closed, the vacuum value smaller than the preset threshold value and not reduced any more is determined as the first vacuum value, then after the first preset time period, the vacuum value detected by the vacuum sensor is determined as the second vacuum value, then the vacuum value difference value and the vacuum value change rate are calculated based on the first vacuum value and the second vacuum value, and finally, whether the detected system leaks or not is judged according to the vacuum value difference value and the vacuum value change rate. In the embodiment of the invention, the judgment mode is carried out based on the vacuum value difference and the vacuum value change rate, so that the influence of vacuum value rise caused by the property of the system on the judgment process can be reduced, and the judgment accuracy is further improved.
Referring to fig. 2, a second schematic diagram of a detection system according to an embodiment of the present invention is shown, where the detection system may include: the vacuum extractor 21, the vacuum sensor 22, the single chip microcomputer controller 23, the connecting pipeline 24, the first pressure sensor 25 and the second pressure sensor 26.
The vacuum extractor 21 can be connected to the system 27 to be tested through the connecting pipeline 24, the vacuum sensor 22 can be disposed on the connecting pipeline 24, and the single chip controller 23 can be connected to the vacuum extractor 21 and the vacuum sensor 22. Further, the single chip microcomputer controller 23 may be configured to control the vacuum extractor 21 to be turned on, the vacuum extractor 21 may be configured to extract the gas in the system under test 27 after being turned on, and the vacuum sensor 22 is configured to detect a vacuum value in the system under test 27.
Further, the single chip microcomputer controller 23 is also used for acquiring a vacuum value detected by the vacuum sensor 22; when the vacuum value is smaller than the preset threshold value and is not reduced any more, controlling the vacuumizing device 21 to be closed; determining a vacuum value which is smaller than a preset threshold value and is not reduced any more as a first vacuum value; after the first preset time period, determining the vacuum value detected by the vacuum sensor 22 as a second vacuum value; based on the first vacuum value and the second vacuum value, a vacuum value difference value and a vacuum value change rate are calculated, and whether the tested system 27 has a leak is determined according to the vacuum value difference value and the vacuum value change rate.
Further, the system under test 27 may include a first fill port 271 and a second fill port 272, and the system under test 27 may be an air conditioning system, a braking system, or the like of the vehicle. Taking the system under test 27 as an air conditioning system as an example, the system under test 27 may include: a Heating Ventilation and air conditioning (HAVC) assembly, a compressor, and a condenser.
Further, the connecting line 24 may include a first line 241 and a second line 242, wherein one end of the first line 241 may be connected to a first end of the vacuum apparatus 21, and the other end of the first line 241 may be connected to a first filling port 271 of the system under test 27. One end of the second line 242 may be connected to a second end of the evacuation device 21, and the other end of the second line 242 may be connected to a second fill port 272 of the system under test 27.
In the embodiment of the invention, the two pipelines are arranged to connect the vacuumizing device and the system to be tested, so that the vacuumizing efficiency of the vacuumizing device can be improved to the greatest extent. Of course, other ways may also be adopted to connect the vacuum-pumping device and the system to be tested, for example, a Y-shaped pipeline including three ports is adopted, and a first end of the Y-shaped pipeline is connected with the vacuum-pumping device, a first end is connected with the first filling port, and a third end is connected with the second filling port, which is not limited in the embodiment of the present invention.
It should be noted that, when the vacuum sensor is disposed, the vacuum sensor may be disposed corresponding to a manner of disposing the pipeline, for example, one vacuum sensor may be disposed on each of the first pipeline and the second pipeline, or only one vacuum sensor may be disposed on the first pipeline or the second pipeline (in fig. 2, one vacuum sensor is taken as an example), which is not limited in this embodiment of the present invention.
Further, the single chip microcomputer controller 23 may be connected to the first pressure sensor 25 and the second pressure sensor 26, the first pressure sensor 25 may be connected to the first filling port 271, the first pressure sensor 25 may be configured to detect a pressure value of the first filling port 271, the second pressure sensor 26 may be connected to the second filling port 272, and the second pressure sensor 26 may be configured to detect a pressure value of the second filling port 272.
In the embodiment of the invention, the first pressure sensor is arranged at the first filling port, the second pressure sensor is arranged at the second filling port, so that when the vacuumizing device is connected with a tested system, the pressure value detected by the first pressure sensor and the pressure value detected by the second pressure sensor can be read, and whether the first filling port and the second filling port are normally opened or not can be judged according to the two pressure values, thereby ensuring that the vacuumizing device can normally extract.
In the detection system provided by the embodiment of the invention, the single chip microcomputer controller can control the vacuumizing device to be started, the vacuumizing device can extract gas in the detected system after being started, the single chip microcomputer controller can obtain the vacuum value detected by the vacuum sensor, when the vacuum value is smaller than the preset threshold value and is not reduced any more, the vacuumizing device is closed, the vacuum value smaller than the preset threshold value and not reduced any more is determined as the first vacuum value, then after the first preset time period, the vacuum value detected by the vacuum sensor is determined as the second vacuum value, then the vacuum value difference value and the vacuum value change rate are calculated based on the first vacuum value and the second vacuum value, and finally, whether the detected system leaks or not is judged according to the vacuum value difference value and the vacuum value change rate. In the embodiment of the invention, the judgment mode is carried out based on the vacuum value difference and the vacuum value change rate, so that the influence of vacuum value rise caused by the property of the system on the judgment process can be reduced, and the judgment accuracy is further improved; meanwhile, whether the first filling port and the second filling port on the system to be tested are normally opened or not can be determined based on the first pressure sensor and the second pressure sensor, and the vacuumizing device can normally extract.
Referring to fig. 3, there is shown one of the steps of a detection method according to an embodiment of the present invention, which may be applied to the detection system shown in fig. 1. Specifically, the method may include:
and 301, controlling the vacuumizing device to be started through the single chip microcomputer controller.
In the embodiment of the present invention, the single chip microcomputer controller may actively start the vacuum pumping device according to a preset time, or may control the vacuum pumping device to start when receiving a start instruction input by a worker, which is not limited in the embodiment of the present invention.
And step 302, extracting gas in the tested system after the vacuumizing device is started.
In the embodiment of the present invention, the vacuum pumping device is a device capable of pumping the system to be tested into a vacuum environment, and may be, for example, a vacuum pump, where the vacuum pump is a device that uses a mechanical, physical, chemical, or physicochemical method to pump the system to be tested to obtain a vacuum. The system under test may be an air conditioning system, a braking system, etc. of the vehicle. Taking the tested system as an air conditioning system as an example, the vacuumizing device can suck air, water vapor and the like in the air conditioning system away, so that the air conditioning system is in a vacuum environment.
And 303, acquiring a vacuum value detected by a vacuum sensor through the singlechip controller, controlling the vacuumizing device to be closed when the vacuum value is smaller than a first preset threshold and is not reduced any more, and determining the vacuum value which is smaller than the first preset threshold and is not reduced any more as the first vacuum value.
In the embodiment of the invention, the vacuum sensor can detect the vacuum value of the system to be detected in real time, and the singlechip controller can acquire the vacuum value detected by the vacuum sensor. Generally, in an actual application scenario, an absolute vacuum degree with a value of 0 does not exist, and a certain leakage amount is allowed to exist in a system in a design and production process. Further, when the vacuum-pumping device is in operation, if the vacuum value in the system to be tested is not reduced any more, the vacuum-pumping device may be considered to have pumped the system to be tested to a vacuum environment, and therefore, in the embodiment of the present invention, the single-chip microcomputer controller may control the vacuum-pumping device to be turned off when the vacuum value is smaller than the first preset threshold value and is not reduced any more. Meanwhile, the vacuum value at the moment, namely the vacuum value which is smaller than the first preset threshold and is not reduced any more, is determined as the first vacuum value, and for example, if the vacuum value in the system to be measured is stabilized at 3.8mbar, the single chip microcomputer controller can determine 3.8mbar as the first vacuum value.
And 304, determining the vacuum value detected by the vacuum sensor as a second vacuum value after the single chip microcomputer controller is in the first preset time period.
In an embodiment of the present invention, the first preset time period may be set according to an actual situation, and in practical applications, in order to make the elastic element in the system to be tested rebound sufficiently, the first preset time period may be 5 seconds (second, s). The single chip microcomputer controller may acquire the vacuum value detected by the vacuum sensor again after determining 5s of the first vacuum value and then determine the vacuum value as the second vacuum value.
And 305, calculating a vacuum value difference value and a vacuum value change rate through the single chip microcomputer controller based on the first vacuum value and the second vacuum value, and judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate.
In the embodiment of the invention, the vacuum value difference can represent a vacuum value increased in a boosting process caused by system rebound, the vacuum value change rate can represent an increase rate of the vacuum value increased in the boosting process caused by system rebound, and the single chip microcomputer controller judges whether the tested system has leakage or not according to the vacuum value difference and the vacuum value change rate, so that the influence of the boosting process caused by system rebound can be fully considered, and the interference of the boosting process generated by system rebound on the judgment of whether the tested system has leakage or not is further reduced.
In summary, the detection method provided in the embodiment of the present invention may control the vacuum pumping device to be turned on through the single chip microcomputer controller, the vacuum pumping device may extract gas in the system to be detected after being turned on, then the single chip microcomputer controller obtains a vacuum value detected by the vacuum sensor, when the vacuum value is smaller than a preset threshold and is not reduced any more, the vacuum pumping device is turned off, and the vacuum value smaller than the preset threshold and not reduced any more is determined as a first vacuum value, then after a first preset time period, the vacuum value detected by the vacuum sensor is determined as a second vacuum value, and then based on the first vacuum value and the second vacuum value, a vacuum value difference and a vacuum value change rate are calculated, and finally, according to the vacuum value difference and the vacuum value change rate, whether the system to be detected has leakage is determined. In the embodiment of the invention, the judgment mode is carried out based on the vacuum value difference and the vacuum value change rate, so that the interference of vacuum value rise caused by the attribute of the system on the judgment process can be reduced, and the judgment accuracy is further improved.
Referring to fig. 4, there is shown a second step flow chart of a detection method according to an embodiment of the present invention, which can be applied to the detection system shown in fig. 2. Specifically, the method may include:
In the embodiment of the invention, when the tightness of the tested system needs to be detected, the vacuumizing device is firstly connected with the tested system, the tested system is closed before the connection, and the first filling port and the second filling port are opened for connection when the vacuumizing device is connected with the tested system, so that if the first filling port is normally opened during the connection, the pressure value of the first filling port fluctuates, and if the second filling port is normally opened, the pressure value of the second filling port fluctuates. In this step, when it is detected that the vacuum pumping device is connected to the system to be tested, the pressure value of the first filling port and the pressure value of the second filling port can be obtained, so that whether the first filling port and the second filling port are normally opened or not can be judged in the subsequent steps.
And 402, if the pressure value of the first filling port is not changed compared with the first initial pressure value, sending first reminding information through the single-chip microcomputer controller.
In this step, the first initial pressure value may be a pressure value detected when the first filling port is not opened. Specifically, the single-chip microcomputer controller may start to monitor the pressure value of the first filling port when the vacuum pumping device is connected with the system to be tested, and if the pressure value of the first filling port is always equal to the first initial pressure value within 10 seconds, it may be determined that the first filling port is not normally opened. When the first filling port can not be normally opened, the vacuumizing device can not normally extract gas in the system to be detected, therefore, in the step, the single-chip microcomputer controller can send first reminding information, and the first reminding information can be used for indicating that the first filling port of the system to be detected has a fault, so that a user can timely overhaul the first filling port, and the vacuumizing device can be ensured to normally extract the gas.
And 403, if the pressure value of the second filling port is not changed compared with the second initial pressure value, sending second reminding information through the single-chip microcomputer controller.
In this step, the second initial pressure value may be a pressure value detected when the second fill port is not opened. Specifically, the single-chip microcomputer controller can start to monitor the pressure value of the second filling port when the vacuum pumping device is connected with the system to be tested, and if the pressure value of the second filling port is always equal to the second initial pressure value within 10s, the second filling port can be considered to be not normally opened. When the second filling port can not be normally opened, the vacuumizing device can not normally extract gas in the system to be detected, therefore, in the step, the single-chip microcomputer controller can send second reminding information, and the second reminding information can be used for indicating that the second filling port of the system to be detected has a fault, so that a user can timely overhaul the second filling port, and the vacuumizing device can be ensured to normally extract the gas.
Accordingly, if both the first fill port and the second fill port are normally open, the subsequent steps can be performed.
And step 404, if the pressure value of the first filling port is changed compared with a first initial pressure value and the pressure value of the second filling port is changed compared with a second initial pressure value, controlling the vacuumizing device to be started through the single-chip microcomputer controller.
Specifically, the implementation manner of this step may refer to step 301, which is not described herein again in this embodiment of the present invention.
And 405, extracting gas in the tested system after the vacuumizing device is started.
Specifically, the implementation manner of this step may refer to step 202, which is not described herein again in this embodiment of the present invention.
And 406, acquiring a vacuum value detected by the vacuum sensor after the vacuumizing device is started for a second preset time through the single-chip microcomputer controller, and acquiring a third vacuum value.
In practical application scenarios, after the vacuum pumping device starts to work, non-condensable gases in the system to be tested, such as air, hydrogen, nitrogen, and lubricant vapor, are pumped out. And under the condition that the system to be tested is not leaked, the vacuum-pumping device can completely pump out the non-condensable gas in the system to be tested after pumping for a period of time, and the vacuum value in the system to be tested is reduced to a certain degree. Therefore, in this step, different vacuum pumping devices may be used to perform experiments in advance to determine the second preset time period, which may represent the time period required for completely pumping the non-condensable gas in the system, and the second preset time period may be 20s, for example. And after the vacuumizing device is started for a second preset time, acquiring a third vacuum value detected by the vacuum sensor, so that whether the tested system has leakage or not is determined based on the third vacuum value in the subsequent steps.
And 407, if the third vacuum value is not less than a second preset threshold value, controlling the vacuum pumping device to be closed through the single-chip microcomputer controller, and determining that the tested system has leakage.
In this step, different vacuum pumping apparatuses may be used in advance to perform experiments to determine a second preset threshold, where the second preset threshold may represent a maximum vacuum value of the system after the non-condensable gas in the system is completely pumped, and for example, the second preset threshold may be 33 mbar. In specific implementation, the second preset time and the second preset threshold may be input into a PCL program of the single chip microcomputer controller, so that the single chip microcomputer controller can control the PCL program conveniently.
If the third vacuum value is 35mbar, the single-chip microcomputer controller can directly control the vacuumizing device to be closed and determine that the tested system has leakage, so that the tightness of the tested system can be determined without subsequent steps, the detection efficiency is improved, and the detection cost is saved. In practical application, when the third vacuum value is not less than the second preset threshold value, an alarm can be sent to a user, so that the user can timely make application measures, at the moment, the user can directly overhaul the tested system, the vacuumizing device can be additionally arranged, or the vacuumizing device with stronger performance is replaced to carry out vacuumizing operation again, if vacuumizing operation is carried out again, the vacuum value of the tested system still cannot meet the second preset threshold value after the second preset time length that the vacuumizing device is started, and then the tested system is overhauled.
And 408, if the third vacuum value is smaller than a second preset threshold, acquiring a vacuum value detected by the vacuum sensor after the vacuumizing device is started for a third preset time period through the single-chip microcomputer controller, and acquiring a fourth vacuum value.
In this step, if the third vacuum value is smaller than the second preset threshold, it may be considered that the tightness of the system to be tested is in a normal state in the process of extracting the non-condensable gas. At this point, the extraction of the system under test may continue.
In the practical application scene, along with evacuating device's operation, the vacuum value in the system under test can constantly increase, and the absolute pressure in the system under test can constantly reduce, and when the absolute pressure in the system under test reduced to the saturated vapor pressure corresponding with ambient temperature, the water molecule that remains in the system will boil into steam, is continuously taken out. Generally, after the non-condensable gas is pumped out by the vacuum pumping device, the absolute pressure in the system to be tested causes the residual water molecules in the system to be boiled into water vapor, and at the moment, the vacuum pumping device starts to pump the water vapor in the system to be tested.
Under the condition that the non-condensable gas is normally pumped away and the tested system is not leaked, the water vapor in the tested system can be pumped out after the vacuumizing device is started for a period of time, and the vacuum value in the tested system is reduced to a certain degree. Therefore, in this step, different vacuum pumping devices may be used to perform experiments in advance to determine a third preset time period, which may represent a time period required for pumping the water vapor in the system, for example, the third preset time period may be 30 s. And after the vacuumizing device is started for a third preset time, acquiring a fourth vacuum value detected by the vacuum sensor, so that whether the tested system has leakage or not is determined based on the fourth vacuum value in the subsequent steps.
And 409, if the fourth vacuum value is not less than a third preset threshold value, controlling the vacuumizing device to be closed through the single-chip microcomputer controller, and determining that the tested system has leakage.
In this step, different vacuum pumping apparatuses may be used to perform experiments in advance to determine a third preset threshold, where the third preset threshold may represent a maximum vacuum value of the system after the water vapor in the system is also pumped, and for example, the third preset threshold may be 15 mbar. In specific implementation, the third preset time and the third preset threshold may be input into a PCL program of the single chip microcomputer controller, so that the single chip microcomputer controller can control the PCL program conveniently.
If the fourth vacuum value is 17mbar, the single-chip microcomputer controller can directly control the vacuumizing device to be closed and determine that the tested system has leakage, so that the tightness of the tested system can be determined without subsequent steps, the detection efficiency is improved, and the detection cost is saved. In practical application, when the fourth vacuum value is not less than the third preset threshold value, an alarm can be sent to a user, so that the user can timely make application measures, at the moment, the user can directly overhaul the tested system, the vacuumizing device can be added, or the vacuumizing device with stronger performance is replaced to carry out vacuumizing operation again, if vacuumizing operation is carried out again, the vacuum value of the tested system still fails to meet the third preset threshold value after the vacuumizing device is started for a third preset time, and then the tested system is overhauled.
Correspondingly, if the fourth vacuum value is smaller than the third preset threshold value, it can be considered as a preliminary determination that the tightness of the system to be tested meets the requirement at this time, and at this time, the vacuum pumping device can be used for continuing pumping and executing the subsequent steps.
Specifically, the implementation manner of this step may refer to step 203 described above, and details of the embodiment of the present invention are not described herein.
And 411, determining the vacuum value detected by the vacuum sensor as a second vacuum value after the single chip microcomputer controller is in the first preset time period.
Specifically, the implementation manner of this step may refer to step 204 described above, and details of the embodiment of the present invention are not described herein.
And 412, calculating a vacuum value difference value and a vacuum value change rate through the single chip microcomputer controller based on the first vacuum value and the second vacuum value, and judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate.
In this step, the difference between the second vacuum value and the first vacuum value is calculated by the single chip microcomputer controller to obtain a vacuum value difference, and the ratio of the vacuum value difference to the first preset time duration is calculated by the single chip microcomputer controller to obtain the vacuum value change rate.
Further, whether the system under test leaks can be judged by the following sub-steps:
substep (1): and if the vacuum value difference is smaller than a fourth preset threshold value, determining that the tested system has no leakage through the single chip microcomputer controller.
In this step, different vacuum pumping apparatuses may be used in advance to perform experiments to determine a fourth preset threshold, where the fourth preset threshold may indicate an increase value of a vacuum value that may be caused when the system without leakage rebounds normally, and for example, the fourth preset threshold may be 7 mbar. Assuming a vacuum value difference of 3mbar, the single-chip microcomputer controller can determine that the tested system has no leakage.
Further, if the vacuum value difference is not less than the fourth preset threshold, the vacuum value change rate can be combined to determine whether the tested system is leaked.
Substep (2): and if the vacuum value difference value is not smaller than a fourth preset threshold value, determining that the tested system has no leakage through the single chip microcomputer controller when the vacuum value change rate is smaller than a preset change rate threshold value.
In this step, different vacuum pumping devices may be used in advance to perform experiments to determine a preset change rate threshold, where the preset change rate threshold may indicate a change rate of a vacuum value when the system without leakage rebounds normally, and for example, the preset change rate threshold may be 1.5mbar/s, and of course, the preset change rate threshold may also be other values, for example, 1.33 mbar/s. Taking the preset threshold value of the change rate as 1.5mbar/s as an example, assuming that the difference value of the vacuum value is 7.3mbar and the change rate of the vacuum value is 1.46mbar/s, the single chip microcomputer controller can determine that the tested system has no leakage.
In practical application, after the single chip microcomputer controller determines that the measured system has no leakage, the single chip microcomputer controller can perform first vacuumizing operation on the measured system, namely, second vacuumizing operation is performed to reduce a raised vacuum value in the measured system, for example, the second vacuumizing time can be 5s, after the second vacuumizing operation is finished, a first filling gun head of a filling pump can be connected with a first filling port, a second filling gun head of the filling pump is connected with a second filling port, and then liquid is filled into the measured system through the filling pump.
In summary, the detection method provided in the embodiment of the present invention may first send a warning message when the first filling port and/or the second filling port are not normally opened by the single chip microcomputer controller, so as to facilitate troubleshooting, if both the first filling port and the second filling port are normally opened, the vacuum pumping device is controlled to be opened, the vacuum pumping device may pump gas in the system to be detected after the vacuum pumping device is opened, then the single chip microcomputer controller obtains a vacuum value detected by the vacuum sensor, when the vacuum value is smaller than a preset threshold and does not decrease any more, the vacuum pumping device is closed, and a vacuum value that is smaller than the preset threshold and does not decrease any more is determined as a first vacuum value, then after a first preset time, the vacuum value detected by the vacuum sensor is determined as a second vacuum value, and based on the first vacuum value and the second vacuum value, a vacuum value difference and a vacuum value change rate are calculated, and finally, judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate. In the embodiment of the invention, the judgment mode is carried out based on the vacuum value difference and the vacuum value change rate, so that the interference of vacuum value rise caused by the attribute of the system on the judgment process can be reduced, and the judgment accuracy is further improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A detection system, characterized in that the detection system comprises: the vacuum pumping device, the vacuum sensor, the single chip microcomputer controller and the connecting pipeline are arranged on the vacuum pumping device;
the vacuumizing device is connected with a system to be tested through the connecting pipeline, the vacuum sensor is arranged on the connecting pipeline, and the single chip microcomputer controller is connected with the vacuumizing device and the vacuum sensor;
the single chip microcomputer controller is used for controlling the vacuumizing device to be started;
the vacuumizing device is used for pumping gas in the tested system after being started;
the vacuum sensor is used for detecting a vacuum value in the system to be tested;
the single chip microcomputer controller is used for:
after the vacuumizing device is started for a second preset time, obtaining a third vacuum value according to the vacuum value detected by the vacuum sensor;
if the third vacuum value is not smaller than a second preset threshold value, controlling the vacuumizing device to be closed, and determining that the tested system has leakage;
if the third vacuum value is smaller than a second preset threshold value, acquiring a vacuum value detected by the vacuum sensor after the vacuumizing device is started for a third preset time period, and acquiring a fourth vacuum value;
if the fourth vacuum value is not smaller than a third preset threshold value, controlling the vacuumizing device to be closed, and determining that the tested system has leakage;
if the fourth vacuum value is smaller than a third preset threshold value, acquiring a vacuum value detected by the vacuum sensor; when the vacuum value is smaller than a preset threshold value and is not reduced any more, controlling the vacuumizing device to be turned off, and determining the vacuum value smaller than the preset threshold value and not reduced any more as a first vacuum value; after the first preset time, determining the vacuum value detected by the vacuum sensor as a second vacuum value; and calculating a vacuum value difference value and a vacuum value change rate based on the first vacuum value and the second vacuum value, and judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate.
2. The detection system of claim 1, wherein the system under test includes a first fill port and a second fill port; the connecting pipeline comprises a first pipeline and a second pipeline;
one end of the first pipeline is connected with the first end of the vacuumizing device, and the other end of the first pipeline is connected with a first filling port of the system to be tested; one end of the second pipeline is connected with the second end of the vacuumizing device, and the other end of the second pipeline is connected with a second filling port of the system to be tested;
the vacuum pumping device is a vacuum pump.
3. The detection system of claim 1, further comprising a first pressure sensor and a second pressure sensor;
the single chip microcomputer controller is connected with the first pressure sensor and the second pressure sensor;
the first pressure sensor is connected with a first filling port and is used for detecting the pressure value of the first filling port; the second pressure sensor is connected with the second filling port and used for detecting the pressure value of the second filling port.
4. A detection method applied to the detection system according to any one of claims 1 to 3, the method comprising:
the vacuumizing device is controlled to be started through the singlechip controller;
after the vacuumizing device is started, gas in the tested system is extracted;
the method comprises the steps that a vacuum value detected by a vacuum sensor is obtained through the single-chip microcomputer controller, when the vacuum value is smaller than a first preset threshold value and is not reduced any more, the vacuumizing device is controlled to be turned off, and the vacuum value which is smaller than the first preset threshold value and is not reduced any more is determined as the first vacuum value;
after the single chip microcomputer controller is in a first preset time period, determining the vacuum value detected by the vacuum sensor as a second vacuum value;
and calculating a vacuum value difference value and a vacuum value change rate by the singlechip controller based on the first vacuum value and the second vacuum value, and judging whether the tested system has leakage or not according to the vacuum value difference value and the vacuum value change rate.
5. The detection method according to claim 4, wherein the step of calculating, by the single chip microcomputer controller, a vacuum value difference value and a vacuum value change rate based on the first vacuum value and the second vacuum value comprises:
calculating the difference of the second vacuum value minus the first vacuum value through the single chip microcomputer controller to obtain a vacuum value difference value;
and calculating the ratio of the vacuum value difference to the first preset time length through the single chip microcomputer controller to obtain the change rate of the vacuum value.
6. The method of claim 4, wherein the step of determining whether the system under test has a leak based on the vacuum value difference and the vacuum value change rate comprises:
if the vacuum value difference is smaller than a fourth preset threshold value, determining that the tested system does not have leakage through the single chip microcomputer controller;
and if the vacuum value difference value is not smaller than a fourth preset threshold value, determining that the tested system has no leakage through the single chip microcomputer controller when the vacuum value change rate is smaller than a preset change rate threshold value.
7. The detection method according to claim 4,
the vacuumizing device is connected with a first filling port of the system to be tested through a first pipeline, and the vacuumizing device is connected with a second filling port of the system to be tested through a second pipeline;
the detection system further comprises a first pressure sensor and a second pressure sensor;
the single chip microcomputer controller is connected with the first pressure sensor and the second pressure sensor;
the first pressure sensor is connected with the first filling port and used for detecting the pressure value of the first filling port; the second pressure sensor is connected with the second filling port and used for detecting the pressure value of the second filling port.
8. The method of claim 7, wherein prior to the step of controlling the vacuum on by the single-chip controller, the method further comprises:
when the singlechip controller detects that the vacuumizing device is connected with the system to be tested, acquiring the pressure value of the first filling port and the pressure value of the second filling port;
if the pressure value of the first filling port is not changed compared with the first initial pressure value, first reminding information is sent out through the single chip microcomputer controller; the first reminding information is used for indicating that a first filling port of the tested system has a fault;
if the pressure value of the second filling port is not changed compared with a second initial pressure value, sending second reminding information through the single-chip microcomputer controller; the second reminding information is used for indicating that a second filling port of the tested system has a fault;
and if the pressure value of the first filling port is changed compared with a first initial pressure value and the pressure value of the second filling port is changed compared with a second initial pressure value, executing the step of controlling the vacuumizing device to be opened through the single-chip microcomputer controller.
9. A vehicle, characterized in that it comprises a detection system according to any one of claims 1 to 3.
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| CN113771812A (en) * | 2020-06-10 | 2021-12-10 | 上海汽车集团股份有限公司 | Control method of electronic vacuum pump, auxiliary power assisting system and new energy automobile |
| CN113670511B (en) * | 2021-08-13 | 2023-10-20 | 宁波爱发科真空技术有限公司 | Vacuum calibration system and detection method thereof |
| CN114803998B (en) * | 2022-03-25 | 2023-09-12 | 江铃汽车股份有限公司 | Anti-freezing solution filling vacuum balance method, system and filling equipment |
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