CN108953131B - Method and apparatus for detecting leakage in an electric vacuum pump system - Google Patents
Method and apparatus for detecting leakage in an electric vacuum pump system Download PDFInfo
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- CN108953131B CN108953131B CN201810759092.XA CN201810759092A CN108953131B CN 108953131 B CN108953131 B CN 108953131B CN 201810759092 A CN201810759092 A CN 201810759092A CN 108953131 B CN108953131 B CN 108953131B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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Abstract
The invention provides a method and a device for detecting leakage of an electric vacuum pump system, wherein the method comprises the following steps: counting the accumulated operation time of the electric vacuum pump in real time in the operation process of the electric vacuum pump; when the accumulated running time reaches the allowed maximum working time, judging whether the electric vacuum pump system is in a leakage state or not according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value; and if the current vacuum degree is smaller than the first threshold value, determining that the electric vacuum pump system is in a leakage state, and detecting whether the electric vacuum pump system leaks.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a method and a device for detecting leakage of an electric vacuum pump system.
Background
In the related art, when the electric vacuum pump is used to pump vacuum, only the vacuum capacity of the electric vacuum pump is generally determined, that is, the capacity of the electric vacuum pump to generate vacuum per unit time is determined. However, the related art has a problem that the electric vacuum pump system is easy to leak, thereby affecting the safety of the whole vehicle operation.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a method for detecting leakage of an electric vacuum pump system, so as to achieve the detection of leakage of the electric vacuum pump system.
A second object of the present invention is to provide an apparatus for detecting leakage in an electric vacuum pump system.
To achieve the above object, an embodiment of a first aspect of the present invention provides a method, including the following steps: counting the accumulated operation time of the electric vacuum pump in real time in the operation process of the electric vacuum pump; when the accumulated running time reaches the allowed maximum working time, judging whether the electric vacuum pump system is in a leakage state or not according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value; determining that the electric vacuum pump system is in a leak state if the current vacuum level is less than the first threshold.
According to the method for detecting the leakage of the electric vacuum pump, the accumulated operation time of the electric vacuum pump is counted in real time in the operation process of the electric vacuum pump, and if the accumulated operation time reaches the allowable maximum operation time, the electric vacuum pump system is determined to be in a leakage state if the current vacuum degree is smaller than the first threshold value. Therefore, the detection method provided by the embodiment of the invention can detect whether the electric vacuum pump system leaks or not, so that the running safety of the whole vehicle is effectively ensured.
According to an embodiment of the invention, after determining that the electric vacuum pump system is in a leak state, further comprising: and comparing the current vacuum degree with preset threshold values of a plurality of leakage states, determining the range of the threshold value of the current vacuum degree, and further determining the leakage grade of the electric vacuum pump system.
According to one embodiment of the present invention, after said determining a leak level of said electric vacuum pump system, further comprising: and when the leakage grade of the electric vacuum pump system is determined to be a second leakage grade, adopting an alarm strategy matched with the second leakage grade to alarm the leakage degree, and controlling the electric vacuum pump to operate in a safe mode.
According to one embodiment of the invention, the safety mode operates at a set working period and takes a preset time interval after operation as a working condition, and the working condition is executed circularly according to a preset working frequency.
According to an embodiment of the present invention, after the controlling the electric vacuum pump to operate in the safety mode, further comprising: after the safe mode operation is finished, continuously returning to execute the operation according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value, and judging whether the electric vacuum pump system is in a leakage state; if the current vacuum degree is larger than or equal to the first threshold value, updating the times that the current vacuum degree is larger than the first threshold value; and controlling the electric vacuum pump to execute a yielding driving working mode when the number of times that the current vacuum degree is greater than or equal to the first threshold value reaches a first preset number of times.
According to one embodiment of the present invention, after said determining a leak level of said electric vacuum pump system, further comprising: and when the leakage grade of the electric vacuum pump system is determined to be a third leakage grade, adopting an alarm strategy matched with the third leakage grade to alarm the leakage degree, limiting the torque of a control motor of the electric vacuum pump, and controlling the electric vacuum pump to run in a safe mode.
According to an embodiment of the present invention, before the determining whether the electric vacuum pump system is in the leakage state according to the current vacuum degree of the electric vacuum pump system and the first threshold, the method further includes: and when the accumulated operation time reaches the normal operation time, comparing the current vacuum degree of the electric vacuum pump system with the first threshold value, and if the current vacuum degree is smaller than the first threshold value, controlling the electric vacuum pump to continuously work until the accumulated operation time reaches the maximum operation time.
According to an embodiment of the present invention, before counting the accumulated operation time of the electric vacuum pump in real time during the operation of the electric vacuum pump, the method further includes: acquiring an atmospheric pressure value of the current environment; and obtaining the leakage judgment threshold value of the current environment according to the obtained atmospheric pressure value and the threshold value coefficient corresponding to each leakage judgment threshold value, wherein the leakage judgment threshold value comprises a first threshold value and a plurality of leakage grade threshold values.
According to an embodiment of the present invention, the obtaining the current ambient atmospheric pressure value includes: collecting a voltage signal output by an atmospheric pressure sensor; judging whether the voltage signal exceeds a preset range or not, and adjusting the voltage signal when the voltage signal exceeds the preset range; and obtaining the atmospheric pressure value according to the voltage signal in the preset range or the adjusted voltage signal.
In order to achieve the above object, a second embodiment of the present invention provides an apparatus for detecting leakage of an electric vacuum pump system, including: the counting module is used for counting the accumulated operation time of the electric vacuum pump in real time in the operation process of the electric vacuum pump; the judging module is used for judging whether the electric vacuum pump system is in a leakage state or not according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value when the accumulated running time reaches the allowed maximum working time; and determining that the electric vacuum pump system is in a leakage state when the current vacuum level is less than the first threshold.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of detecting a leak in a motorized vacuum pump system in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of a method for detecting a leak in a motorized vacuum pump system in accordance with one embodiment of the present invention
Fig. 3 is a block diagram illustrating an apparatus for detecting a leak in an electric vacuum pump system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A method and system for detecting leakage of an electric vacuum pump according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method for detecting a leak in a motor-driven vacuum pump system according to an embodiment of the present invention. As shown in fig. 1, a method for detecting leakage of an electric vacuum pump according to an embodiment of the present invention includes the following steps:
s101: and counting the accumulated operation time of the electric vacuum pump in real time in the operation process of the electric vacuum pump.
S102: and when the accumulated running time reaches the allowed maximum working time, judging whether the electric vacuum pump system is in a leakage state or not according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value.
S103: and if the current vacuum degree is smaller than the first threshold value, determining that the electric vacuum pump system is in a leakage state.
Wherein the first threshold is a shut-down threshold of the electric vacuum pump.
It should be noted that the electric vacuum pump system includes an electric vacuum pump, a vacuum tank and a vacuum degree sensor, wherein the electric vacuum pump is used for vacuumizing the vacuum tank, and the vacuum degree sensor is used for detecting the real-time vacuum degree of the electric vacuum pump system. When the electric vacuum pump normally operates, the vacuum degree of the vacuum tank is gradually increased under the action of the electric vacuum pump for pumping until the vacuum degree reaches a closing threshold value. In other words, in the normal mode, the electric vacuum pump is started to operate to vacuumize the vacuum tank, and when the normal operation working time is reached, the vacuum degree sensor detects that the current vacuum degree of the system reaches a closing threshold value, the electric vacuum pump is controlled to be closed, and the vacuum pumping is stopped. Therefore, if the operation of the electric vacuum pump reaches the maximum working time, the current vacuum degree of the system still cannot reach the closing threshold value, and the leakage of the electric vacuum pump system is indicated, namely, external gas continuously enters the system, and the vacuumizing effect of the electric vacuum pump is influenced.
Specifically, in the running process of the electric vacuum pump, the accumulated running time of the electric vacuum pump is counted in real time, the accumulated running time is compared with the maximum working time, when the accumulated running time is greater than or equal to the maximum working time, the accumulated running time is determined to reach the allowed maximum working time, the current vacuum degree of the electric vacuum pump system and the preset first threshold value are judged, and if the current vacuum degree is smaller than the first threshold value, the electric vacuum pump system is determined to be in a leakage state.
According to one embodiment of the present invention, after determining that the electric vacuum pump system is in the leak state, further comprising: and comparing the current vacuum degree with preset threshold values of a plurality of leakage states, determining the threshold value range of the current vacuum degree, and further determining the leakage grade of the electric vacuum pump system.
The threshold values of the plurality of leakage states may be two or three, and correspondingly, the threshold value ranges may be three or four.
The process of determining the leak level of an electric vacuum pump system is described in detail below, taking two thresholds of leak conditions as examples.
S201: and comparing the current vacuum degree with a preset second threshold value, and if the current vacuum degree is greater than the second threshold value, determining that the electric vacuum pump system is in a first leakage state.
S202: and if the current vacuum degree is smaller than or equal to the second threshold value, comparing the current vacuum degree with a preset third threshold value, and if the current vacuum degree is larger than the third threshold value, determining that the system is at a second leakage level.
S203: if the current vacuum level is less than or equal to a third threshold, it is determined that the electric vacuum pump system is at a third leak level.
The first threshold value is larger than the second threshold value, and the second threshold value is larger than the third threshold value. That is, a first threshold range is formed between the first threshold value and the second threshold value, a second threshold range is formed between the second threshold value and the third threshold value, corresponding to the first leakage level, and a third threshold range is formed between the second threshold value and the third threshold value, corresponding to the second leakage level, and a third leakage level.
Specifically, after the current vacuum degree is greater than a preset first threshold value, the relationship between the current vacuum degree and a second threshold value is determined, if the current threshold value is greater than the second threshold value, it is determined that the current vacuum degree is within a first threshold value range, the corresponding vacuum pump system is at a first leakage level, if the current vacuum degree is less than or equal to the second threshold value, the relationship between the current vacuum degree and a third threshold value is further determined, if the current vacuum degree is less than or equal to the second threshold value and greater than the third threshold value, it is determined that the current vacuum degree is within the second threshold value range, the corresponding vacuum pump system is at a second leakage level, if the current vacuum degree is less than or equal to the third threshold value, it is determined that the current vacuum degree is within the third threshold value range, and the corresponding vacuum pump system is at a third leakage level.
It should be appreciated that the first, second and third thresholds are progressively decreasing in magnitude, i.e., the first leakage level has a lower degree of leakage than the second leakage level, and the second leakage level has a lower degree of leakage than the third leakage level. For example, the first, second, and third leak levels may be designated as low, medium, and high leak levels, respectively. The first threshold value can be a closing threshold value of the electric vacuum pump, the second threshold value can be a leakage judging threshold value of the electric vacuum pump system, and the third threshold value can be an opening threshold value of the electric vacuum pump.
According to one embodiment of the invention, when the leakage grade of the electric vacuum pump system is determined to be the second leakage grade, an alarm strategy matched with the second leakage grade is adopted to alarm the leakage degree, and the electric control vacuum pump is controlled to operate in a safe mode.
It should be noted that, since the leakage degree of the electric vacuum pump system increases with the increase of the leakage level, when the leakage level of the electric vacuum pump system is the second leakage level (intermediate leakage level), it indicates that the leakage of the electric vacuum pump system is serious, and an alarm needs to be given, and the electric vacuum pump is controlled to operate in the safe operation mode.
The safety mode operates in a set working period and has a rest preset time interval after operation as a working condition, and the working condition is executed circularly according to preset working times. For example, the duty cycle may be a first preset time for controlling the electric vacuum pump to operate, the time interval may be a second preset time, and the number of cycles is N, that is, the electric vacuum pump is controlled to operate for the first preset time, then the electric vacuum pump is rested for the second preset time, and then the electric vacuum pump is started to operate for the first preset time and rested for the second preset time, so that the cycles are performed for N times. The first preset time and the second preset time may be equal or unequal, and N is an integer greater than 1, for example, 10.
Further, after the safe mode operation is finished, continuously returning to execute, judging whether the electric vacuum pump system is in a leakage state according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value, if the current vacuum degree is larger than or equal to the first threshold value, updating the times that the current vacuum degree is larger than the first threshold value, and when the times that the current vacuum degree is larger than or equal to the first threshold value reaches the first preset times, controlling the electric vacuum pump to execute the conceding driving working mode.
Wherein, the first preset number of times may be 10 times.
Therefore, after the leakage degree of the electric vacuum pump system reaches a medium leakage level, the current vacuum degree of the electric vacuum pump system is adjusted through the safe mode operation, so that the residual workable capacity of the current vehicle is utilized to the maximum extent on the premise of ensuring safe driving, and the system is prevented from continuously performing in a fault mode in a circulating mode due to unpredictable factors by means of increasing the returnable points after the safe mode is finished.
According to another embodiment of the present invention, when it is determined that the leakage level of the electric vacuum pump system is the third leakage level, a leakage level alarm is performed using an alarm strategy matched to the third leakage level, a torque limit is performed on a control motor of the electric vacuum pump, and the electric vacuum pump is controlled to operate in a safe mode.
It should be appreciated that when the leakage level of the electric vacuum pump system is the third leakage level, the electric vacuum pump system is in a high leakage state, and the electric vacuum pump system issues a severe leakage alarm while performing torque limitation on a control motor of the electric vacuum pump and controlling the electric vacuum pump to operate in a safe mode.
It should be noted that, when the leakage level of the electric vacuum pump system is the first leakage level, the electric vacuum pump system is in a low-leakage state, and at this time, although the electric vacuum pump system has a leakage condition, the driving safety is not affected, and the driving can be continued by returning to the normal operation mode.
According to an embodiment of the present invention, before determining whether the electric vacuum pump is in the state according to the current vacuum degree of the electric vacuum pump and the first threshold, the method further includes: and when the accumulated operation time reaches the normal operation time, comparing the current vacuum degree of the electric vacuum pump system with a first threshold value, and if the current vacuum degree is smaller than the first threshold value, controlling the electric vacuum pump to continuously work until the accumulated operation time reaches the maximum operation time.
That is to say, after the electric vacuum pump is started to operate to vacuumize the vacuum tank, the electric vacuum pump is controlled to operate for a normal working time, then whether the current vacuum degree reaches a first threshold value or not is judged, if the current vacuum degree reaches the first threshold value, the electric vacuum pump is controlled to be closed, vacuumizing is stopped, if the current vacuum degree is smaller than the first threshold value, the electric vacuum pump is controlled to continue to operate until the accumulated operation time reaches the maximum working time, and at the moment, the electric vacuum pump system is subjected to leakage judgment.
According to an embodiment of the present invention, as shown in fig. 2, a method for detecting a leak in an electric vacuum pump system according to an embodiment of the present invention includes the steps of:
s301: and (5) driving in a normal working mode.
S302: and self-checking the electric vacuum pump system.
S303: and judging whether the current vacuum degree of the system is less than or equal to the starting threshold value of the electric vacuum pump.
If yes, go to step S304; if not, return to step S301.
S304: and controlling the normal operation time of the electric vacuum pump.
S305: and judging whether the current vacuum degree of the system is less than or equal to the closing threshold value of the electric vacuum pump.
If yes, executing step S306; if not, return to step S301.
S306: and controlling the electric vacuum pump to operate for the maximum working time.
S307: and judging whether the current vacuum degree of the system is less than or equal to the closing threshold value of the electric vacuum pump again.
If yes, go to step S308; if not, return to step S310.
S308: and judging whether the current vacuum degree of the system is less than or equal to a system leakage judging threshold value or not.
If so, go to step S309; if not, step S312 is performed.
S309: and judging whether the current vacuum degree of the system is less than or equal to the starting threshold value of the electric vacuum pump.
If yes, go to step S314; if not, step S313 is performed.
S310: and judging whether the number of times that the current vacuum degree of the system is greater than or equal to the first threshold value reaches a first preset number of times.
If yes, go to step S311; if not, return to step S301.
S311: entering a concession driving mode.
S312: determines a low degree of leakage of the system and returns to step S301.
S313: a leakage degree alarm is made and the electric vacuum pump is controlled to operate in the safe mode, and the process returns to step S307.
S314: and alarming the leakage degree, limiting the torque of a control motor of the electric vacuum pump, and controlling the electric vacuum pump to run in a safe mode.
Further, according to an embodiment of the present invention, before counting the accumulated operation time of the electric vacuum pump in real time during the operation of the electric vacuum pump, the method further includes: and acquiring the atmospheric pressure value of the current environment, and acquiring the leakage judgment threshold value of the current environment according to the acquired atmospheric pressure value and the threshold coefficient corresponding to each leakage judgment threshold value. Wherein the leakage determination threshold includes a first threshold and a plurality of leakage level thresholds.
Further, obtaining the current ambient atmospheric pressure value includes: collecting a voltage signal output by an atmospheric pressure sensor, judging whether the voltage signal exceeds a preset range, adjusting the voltage signal when the voltage signal exceeds the preset range, and obtaining an atmospheric pressure value according to the voltage signal in the preset range or the adjusted voltage signal.
That is, the first threshold, the second threshold, and the third threshold may be calculated from the current atmospheric air pressure value.
Specifically, the detection can be performed through an atmospheric pressure sensor, then a voltage signal output by the atmospheric pressure sensor is collected, whether the voltage signal exceeds a preset range is judged, if the voltage signal exceeds the preset range, the voltage signal is adjusted, so that the normal operation of the whole vehicle is not affected, wherein standby parameters can be used for adjusting the voltage signal to replace the voltage signal exceeding the preset range, then the voltage signal within the preset range or the adjusted voltage signal is subjected to fitting calculation, an atmospheric pressure value of the current environment conforming to engineering significance is obtained, and finally the atmospheric pressure value of the current environment and a threshold coefficient corresponding to each leakage judgment threshold value are calculated, so that the leakage judgment threshold values of the corresponding current environment, namely a first threshold value, a second threshold value and a third threshold value, are obtained.
It should be noted that the calculated mapping function between the leakage determination threshold value of the current environment and the atmospheric pressure value of the current environment is a linear function.
Therefore, the atmospheric pressure value of the current environment is acquired, and the leakage judgment threshold value of the current environment is acquired through the atmospheric pressure of the current environment, so that the leakage judgment threshold value can be in accordance with the current running environment of the vehicle, namely, different leakage judgment threshold values are adopted for areas with different environmental atmospheric pressure values, the system leakage misjudgment is avoided, the accuracy of the system leakage judgment is improved, and the safety of the running of the vehicle is improved.
In summary, according to the method for detecting leakage of an electric vacuum pump in the embodiment of the present invention, the accumulated operation time of the electric vacuum pump is counted in real time during the operation of the electric vacuum pump, and if the accumulated operation time reaches the allowable maximum operation time, if the current vacuum degree is smaller than the first threshold value, it is determined that the electric vacuum pump system is in a leakage state. Therefore, the detection method provided by the embodiment of the invention can detect whether the electric vacuum pump system leaks or not, so that the running safety of the whole vehicle is effectively ensured
In order to implement the above embodiments, the present invention further provides an apparatus for detecting leakage of an electric vacuum pump system.
Fig. 3 is a block diagram illustrating an apparatus for detecting a leak in an electric vacuum pump system according to an embodiment of the present invention. As shown in fig. 3, the apparatus 100 for detecting a leak in an electric vacuum pump system includes: a statistic module 10 and a judgment module 20.
The statistical module 10 is used for real-time counting the accumulated operation time of the electric vacuum pump in the operation process of the electric vacuum pump; the judging module 20 is configured to judge whether the electric vacuum pump system is in a leakage state according to a current vacuum degree of the electric vacuum pump system and a preset first threshold when the accumulated operation duration reaches an allowable maximum operation duration; and when the current vacuum degree is smaller than the first threshold value, determining that the electric vacuum pump system is in a leakage state.
Further, in a possible implementation manner of the embodiment of the present invention, after determining that the electric vacuum pump system is in the leakage state, the determining module 20 is further configured to: and comparing the current vacuum degree with preset threshold values of a plurality of leakage states, determining the threshold value range of the current vacuum degree, and further determining the leakage grade of the electric vacuum pump system.
Further, after determining the leak level of the electric vacuum pump system, the determination module 20 is further configured to: and when the leakage grade of the electric vacuum pump system is determined to be a second leakage grade, adopting an alarm strategy matched with the second leakage grade to alarm the leakage degree, and controlling the electric vacuum pump to operate in a safe mode.
Further, the safety mode operates in a set working period and takes a preset time interval for rest after operation as a working condition, and the working condition is executed circularly according to preset working times.
Further, after controlling the electric vacuum pump to operate in the safe mode, the determining module 20 is further configured to: after the safe mode operation is finished, continuously returning to execute, and judging whether the electric vacuum pump system is in a leakage state or not according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value; if the current vacuum degree is larger than or equal to the first threshold value, updating the times that the current vacuum degree is larger than the first threshold value; and controlling the electric vacuum pump to execute a conceding driving working mode when the number of times that the current vacuum degree is greater than or equal to the first threshold value reaches a first preset number of times.
Further, after determining the leak level of the electric vacuum pump system, the determination module 20 is further configured to: and when the leakage grade of the electric vacuum pump system is determined to be a third leakage grade, adopting an alarm strategy matched with the third leakage grade to alarm the leakage degree, limiting the torque of a control motor of the electric vacuum pump, and controlling the electric vacuum pump to run in a safe mode.
Further, before determining whether the electric vacuum pump system is in the leakage state according to the current vacuum degree of the electric vacuum pump system and the first threshold, the determining module 20 is further configured to: and when the accumulated operation time reaches the normal operation time, comparing the current vacuum degree of the electric vacuum pump system with a first threshold value, and if the current vacuum degree is smaller than the first threshold value, controlling the electric vacuum pump to continuously work until the accumulated operation time reaches the maximum operation time.
Further, before the accumulated operation duration of the electric vacuum pump is counted in real time during the operation process of the electric vacuum pump, the determining module 20 is further configured to: acquiring an atmospheric pressure value of the current environment; and obtaining the leakage judgment threshold value of the current environment according to the obtained atmospheric pressure value and the threshold value coefficient corresponding to each leakage judgment threshold value, wherein the leakage judgment threshold value comprises a first threshold value and a plurality of leakage grade threshold values.
Further, the determining module 20 is further configured to: collecting a voltage signal output by an atmospheric pressure sensor; judging whether the voltage signal exceeds a preset range or not, and adjusting the voltage signal when the voltage signal exceeds the preset range; and obtaining the atmospheric pressure value according to the voltage signal in the preset range or the adjusted voltage signal.
It should be noted that the foregoing explanation of the embodiment of the method for detecting leakage of an electric vacuum pump system is also applicable to the apparatus for detecting leakage of an electric vacuum pump system of this embodiment, and will not be repeated herein.
In order to implement the above embodiments, the present invention further provides another electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for detecting leakage of an electric vacuum pump system.
In order to implement the above embodiments, the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the aforementioned method of detecting a leak in an electric vacuum pump system.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A method of detecting a leak in a motorized vacuum pump system, comprising the steps of:
counting the accumulated operation time of the electric vacuum pump in real time in the operation process of the electric vacuum pump;
when the accumulated running time reaches the allowed maximum working time, judging whether the electric vacuum pump system is in a leakage state or not according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value;
if the current vacuum degree is smaller than the preset first threshold value, determining that the electric vacuum pump system is in a leakage state;
before the determining whether the electric vacuum pump system is in a leakage state according to the current vacuum degree of the electric vacuum pump system and a preset first threshold, the method further comprises:
when the accumulated running time reaches the normal working time, comparing the current vacuum degree of the electric vacuum pump system with the preset first threshold value,
and if the current vacuum degree is smaller than the preset first threshold value, controlling the electric vacuum pump to continuously work until the accumulated running time reaches the maximum working time.
2. The method of detecting a leak in a motor-driven vacuum pump system of claim 1, wherein after determining that the motor-driven vacuum pump system is in a leak state, further comprising:
and comparing the current vacuum degree with preset threshold values of a plurality of leakage states, determining the range of the threshold value of the current vacuum degree, and further determining the leakage grade of the electric vacuum pump system.
3. A method of detecting a leak in an electric vacuum pump system as set forth in claim 2, further comprising, after said determining a leak level for said electric vacuum pump system:
and when the leakage grade of the electric vacuum pump system is determined to be a second leakage grade, adopting an alarm strategy matched with the second leakage grade to alarm the leakage degree, and controlling the electric vacuum pump to operate in a safe mode.
4. The method of claim 3, wherein the safety mode is operated at a set duty cycle and is rested for a preset time interval after the operation as an operating condition, and the operating condition is cyclically performed at a preset number of times.
5. The method of detecting a leak in an electric vacuum pump system according to claim 3, further comprising, after said controlling the electric vacuum pump to operate in a safe mode:
after the safe mode operation is finished, continuously returning to execute the operation according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value, and judging whether the electric vacuum pump system is in a leakage state;
if the current vacuum degree is greater than or equal to the preset first threshold value, updating the times that the current vacuum degree is greater than the preset first threshold value; and
and when the number of times that the current vacuum degree is greater than or equal to a preset first threshold value reaches a first preset number of times, controlling the electric vacuum pump to execute a yielding driving working mode.
6. A method of detecting a leak in an electric vacuum pump system as set forth in claim 2, further comprising, after said determining a leak level for said electric vacuum pump system:
and when the leakage grade of the electric vacuum pump system is determined to be a third leakage grade, adopting an alarm strategy matched with the third leakage grade to alarm the leakage degree, limiting the torque of a control motor of the electric vacuum pump, and controlling the electric vacuum pump to run in a safe mode.
7. The method of claim 1, wherein before counting the accumulated operation duration of the electric vacuum pump in real time during the operation of the electric vacuum pump, the method further comprises:
acquiring an atmospheric pressure value of the current environment;
and obtaining the leakage judgment threshold value of the current environment according to the obtained atmospheric pressure value and the threshold value coefficient corresponding to each leakage judgment threshold value, wherein the leakage judgment threshold value comprises a preset first threshold value and a plurality of leakage grade threshold values.
8. The method of claim 7, wherein said obtaining a current ambient atmospheric pressure value comprises:
collecting a voltage signal output by an atmospheric pressure sensor;
judging whether the voltage signal exceeds a preset range or not, and adjusting the voltage signal when the voltage signal exceeds the preset range;
and obtaining the atmospheric pressure value according to the voltage signal in the preset range or the adjusted voltage signal.
9. An apparatus for detecting leakage in an electric vacuum pump system, comprising:
the counting module is used for counting the accumulated operation time of the electric vacuum pump in real time in the operation process of the electric vacuum pump;
the judging module is used for judging whether the electric vacuum pump system is in a leakage state or not according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value when the accumulated running time reaches the allowed maximum working time; when the current vacuum degree is smaller than the preset first threshold value, determining that the electric vacuum pump system is in a leakage state; and
before judging whether the electric vacuum pump system is in a leakage state according to the current vacuum degree of the electric vacuum pump system and a preset first threshold value, the method is further used for: and when the accumulated operation time reaches the normal operation time, comparing the current vacuum degree of the electric vacuum pump system with the preset first threshold value, and if the current vacuum degree is smaller than the preset first threshold value, controlling the electric vacuum pump to continuously operate until the accumulated operation time reaches the maximum operation time.
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| CN112524012B (en) * | 2019-09-18 | 2022-05-20 | 青岛海尔电冰箱有限公司 | Method and device for testing performance of vacuum pump |
| CN112776789B (en) * | 2019-11-08 | 2022-07-15 | 广州汽车集团股份有限公司 | Brake vacuum power system leakage diagnosis method and system and storage medium |
| CN112092794A (en) * | 2020-08-20 | 2020-12-18 | 北汽福田汽车股份有限公司 | Control method and device and control system for vacuum pump of electric vehicle and vehicle |
| CN114572178B (en) * | 2020-11-30 | 2023-12-01 | 长城汽车股份有限公司 | Alarm method and system of vacuum booster device and vehicle |
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| CN104034495A (en) * | 2013-03-06 | 2014-09-10 | 楚天科技股份有限公司 | Vacuum leak detection method and vacuum leak detection system for containers |
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