Dryer unloading state judgment method and air compressor control method and system

Abstract

The invention belongs to the field of vehicle electric air compressor control, and particularly relates to a dryer unloading state judgment method and an air compressor control method and system. When it is judged that the working current of the air compressor continuously meets the first set condition, it is judged that the dryer is in the unloading state; the first set condition is that the current working current of the air compressor is smaller than the working current before the first set time length, and the difference between the current working current and the working current before the first set time length exceeds a corresponding set change threshold value. Therefore, the situation that the working current of the air compressor has the change trend of great decrease is determined through continuous and large-amplitude decrease of the working current of the air compressor, a pressure sensor does not need to be installed, and the working current level of the air compressor under the normal condition and the more accurate unloading condition does not need to be concerned; and only whether the working current of the air compressor has an obvious descending trend or not needs to be concerned, so that the method has relatively high adaptability and can be flexibly applied to more different working conditions of the air compressor.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle electric air compressor control, and in particular relates to a dryer unloading state judgment method, an air compressor control method and a system. Background Art

[0002] Commercial vehicles generally use pneumatic braking to decelerate the vehicle due to their large curb weight or maximum gross mass. To ensure vehicle braking safety, the braking system needs to provide stable and high braking pressure. Traditional fuel vehicles generally use a purely mechanical air compressor. After the vehicle is started, the engine starts running, and the air compressor is driven by a belt to continuously provide an air pressure source for the braking system. Even if the braking system has reached the target pressure value, the air compressor will continue to work due to the running of the engine, resulting in energy waste. Therefore, new energy vehicles usually use electric air compressors, which control the air compressor to start when the brake system pressure is lower than a certain value, and control the air compressor to stop when the pressure reaches the target value to reduce energy loss.

[0003] To prevent the air from containing high moisture during the air compressor pumping process, the general air circuit connection of new energy vehicles is as follows: Figure 1 As shown, the air compressor compresses the air into high-pressure gas. The compressed high-temperature gas is transferred to the condenser to reduce the temperature. After the high-pressure compressed gas is condensed, the water vapor in the air condenses into liquid water. The liquid water is adsorbed after the high-pressure gas with liquid water passes through the dryer. The dry high-pressure gas is replenished to each air bag through the four-circuit valve to achieve a complete inflation process. When the dryer is unloaded, the dryer is regenerated by backblowing the air storage cylinder. In the prior art, since the unloading pressure of the dryer is basically consistent with the pressure target value of the air compressor, the basic principle of the air compressor shutdown control is to judge the unloading of the dryer (that is, to characterize the cylinder pressure value reaching the pressure target value of the air compressor through the unloading of the dryer), and then control the air compressor to shut down.

[0004] At present, there are two main methods for judging the unloading of the dryer. One is to judge whether the dryer is unloaded by installing a sensor that can collect the unloading state signal of the air compressor. For example, the Chinese invention patent with application publication number CN107120262A discloses an electric air compressor control strategy and fault diagnosis method. This scheme can judge whether the dryer is in the unloading state by the switch signal of the unloading pressure switch sensor; the other is to judge the unloading by judging that the working current of the air compressor is less than the set threshold. For example, the Chinese invention patent with application publication number CN114738252A discloses A control method, system, device and storage medium for an electric air compressor are disclosed. The scheme can make unloading judgment by determining whether the working current of the air compressor is the unloading current. However, of the two types of methods, the former type of method does not need to consider the working current of the air compressor during unloading, but involves the installation of sensors, so the cost is relatively high, while the latter type of method has low adaptability. For example, if the voltage platform of the air compressor changes or for different models of air compressors, it is necessary to re-calibrate the set threshold value for comparison with the working current of the air compressor (i.e., the working current of the air compressor during unloading), which makes it difficult to flexibly adapt to different air compressor working conditions. Summary of the invention

[0005] The object of the present invention is to provide a method for judging the unloading state of a dryer, an air compressor control method and a system, so as to solve the problem that the method for judging the unloading state of a dryer in the prior art is difficult to achieve both low cost and high adaptability.

[0006] In order to achieve the above object, the present invention provides a method for determining the unloading state of a dryer. If it is determined that the working current of the air compressor continuously satisfies a first set condition, it is determined that the dryer is in the unloading state.

[0007] The first setting condition is that the current working current of the air compressor is less than the working current before the first setting time, and the difference between the current working current and the working current before the first setting time exceeds the corresponding setting change threshold.

[0008] Furthermore, the method of determining that the working current of the air compressor continuously satisfies the first set condition includes: determining that the working current of the air compressor satisfies the first set condition for multiple consecutive times, or determining that the working current of the air compressor satisfies the first set condition for a second set time period.

[0009] Furthermore, the total duration of the continuous multiple determinations that the working current of the air compressor meets the first set condition is less than the first set duration; and the second set duration is less than the first set duration.

[0010] Further, the method of judging whether the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold includes:

[0011] If the difference between the current working current of the air compressor and the working current before the first set time is less than the set lower limit, it is determined that the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold.

[0012] The above technical solution of the present invention provides a new method for judging the unloading state of a dryer, and its beneficial effects include:

[0013] Through the continuous and significant decrease in the working current of the air compressor, it is determined that the working current of the air compressor has a significant downward trend. After analysis, the change in load when the air compressor works normally (the dryer is not unloaded) and the dryer is unloaded will cause a change in the working current. That is, after the dryer is unloaded, the working current will obviously show a significant downward trend from the data. By utilizing the characteristic of the continuous relative change of the working current of the air compressor caused by the downward trend, the unloading of the dryer can be conveniently and accurately determined by the relative change between the current working current and the working current before the second set time. There is no need to install a pressure sensor, nor to pay attention to the working current level of the air compressor under normal conditions and under dryer unloading conditions. It is only necessary to pay attention to whether the working current of the air compressor shows an obvious downward trend. Therefore, even in the case of changes in the air compressor voltage platform, there is basically no need to recalibrate the relevant threshold parameters. It has strong adaptability and can be flexibly applied to more different air compressor working conditions.

[0014] The present invention further provides a dryer unloading state judgment system, comprising a processor, wherein the processor stores executable program instructions, and the executable program instructions are used to be executed to implement the dryer unloading state judgment method as described above.

[0015] The technical solution of the dryer unloading state judgment system of the present invention can achieve the same beneficial effects as the dryer unloading state judgment method described above.

[0016] The present invention also provides an air compressor control method, when it is determined that the dryer is in an unloading state, the air compressor is controlled to stop, if it is determined that the working current of the air compressor continuously meets the first set condition, then it is determined that the dryer is in an unloading state;

[0017] The first setting condition is that the current working current of the air compressor is less than the working current before the first setting time, and the difference between the current working current of the air compressor and the working current before the first setting time exceeds the corresponding setting change threshold.

[0018] Furthermore, the method of determining that the working current of the air compressor continuously satisfies the first set condition includes: determining that the working current of the air compressor satisfies the first set condition for multiple consecutive times, or determining that the working current of the air compressor satisfies the first set condition for a second set time period.

[0019] Furthermore, the total duration of the continuous multiple determinations that the working current of the air compressor meets the first set condition is less than the first set duration; and the second set duration is less than the first set duration.

[0020] Further, the method of judging whether the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold includes:

[0021] If the difference between the current working current of the air compressor and the working current before the first set time is less than the set lower limit, it is determined that the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold.

[0022] Compared with the existing air compressor control scheme, the technical scheme of the air compressor control method of the present invention is improved in the judgment of the unloading state of the dryer, and its beneficial effects include:

[0023] Through the continuous and significant decrease in the working current of the air compressor, it is determined that the working current of the air compressor has a significant downward trend. After analysis, the change in load when the air compressor works normally (the dryer is not unloaded) and the dryer is unloaded will cause a change in the working current. That is, after the dryer is unloaded, the working current will obviously show a significant downward trend from the data. By utilizing the characteristic of the continuous relative change of the working current of the air compressor caused by the downward trend, the unloading of the dryer can be easily and accurately determined by the relative change between the current working current and the working current in the previous period. There is no need to install a pressure sensor, nor to pay attention to the working current level of the air compressor under normal conditions and under dryer unloading conditions. It is only necessary to pay attention to whether the working current of the air compressor shows an obvious downward trend. Therefore, even in the case of changes in the air compressor voltage platform, there is basically no need to recalibrate the relevant threshold parameters. It has strong adaptability and can be flexibly applied to more different air compressor shutdown control scenarios.

[0024] The present invention further provides an air compressor control system, comprising a processor, wherein the processor stores executable program instructions, and the executable program instructions are used to be executed to implement the air compressor control method as described above.

[0025] The technical solution of the air compressor control system of the present invention can achieve the same beneficial effects as the above-mentioned air compressor control method. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the principle of general gas circuit connection of new energy vehicles in the background technology of the present invention;

[0027] Figure 2It is a flowchart of the method for judging the unloading state of a dryer in the embodiment of the method for judging the unloading state of a dryer of the present invention;

[0028] Figure 3 A schematic diagram showing the principle of setting the relationship between the duration of the working current of the air compressor continuously satisfying the first set condition and the first set time length in an embodiment of the air compressor control method of the present invention;

[0029] Figure 4 It is a flowchart of the air compressor control method in the embodiment of the air compressor control method of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Embodiment of the method for judging the unloading state of the dryer

[0032] This embodiment provides a technical solution for a method for determining the unloading state of a dryer. The method determines the unloading state of the dryer by determining the downward trend of the working current of the air compressor. Figure 2 , the method specifically comprises:

[0033] If it is determined that the working current of the air compressor continues to meet the first set condition, the dryer is determined to be in an unloaded state; wherein, the first set condition is: the current working current of the air compressor is less than the working current before the first set time period, and the difference between the current working current and the working current before the first set time period exceeds the set variation range.

[0034] Therefore, it is equivalent to determining that the working current of the air compressor has a substantial downward trend through the continuous and substantial decline in the working current of the air compressor. After analysis, the change in load when the air compressor is working normally (dryer is not unloaded) and the dryer is unloaded will lead to a change in the working current. That is, after the dryer is unloaded, the working current will obviously show a significant downward trend from the data. By utilizing the characteristic of the continuous relative change in the working current of the air compressor caused by the downward trend, the dryer unloading can be conveniently and accurately determined through the relative change between the current working current and the working current in the previous period. There is no need to install a pressure sensor or pay attention to the working current level of the air compressor under normal conditions and under dryer unloading conditions. It is only necessary to pay attention to whether the working current of the air compressor shows an obvious downward trend. Therefore, even in the case of changes in the air compressor voltage platform, there is basically no need to recalibrate the relevant threshold parameters. It has strong adaptability and can be flexibly applied to more different air compressor working conditions.

[0035] Among them, the manner of judging that the working current of the air compressor continuously satisfies the first setting condition includes: judging that the working current of the air compressor satisfies the first setting condition for multiple consecutive times, or judging that the working current of the air compressor satisfies the first setting condition for a second setting time. That is, the working current of the air compressor can be judged as continuously satisfying the condition if it satisfies the first setting condition for a certain period of time, or it can be judged as continuously satisfying the condition if the working current of the air compressor satisfies the first setting condition for a certain number of judgments, and the specific selection can be flexibly made according to actual needs.

[0036] Methods for determining whether the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold include:

[0037] If the difference between the current working current of the air compressor and the working current before the first set time is less than the set lower limit, it is determined that the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold. In this embodiment, the set lower limit is -2A, the judgment duration (the total judgment duration and the second set duration for multiple consecutive judgments that the working current of the air compressor meets the first set condition) is 0.4 seconds, and the first set duration is 0.4 seconds. The difference between the current working current of the air compressor and the working current 1 second ago is calculated in real time. If it lasts for 0.4 seconds and the calculation results are all negative and less than -2A, it can be determined that the dryer has been unloaded. The specific set lower limit, the judgment duration or the number of judgments, and the set duration can be adaptively set based on the compatibility of different platforms.

[0038] In other embodiments, the method for judging whether the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold value can also be that when the absolute value of the difference obtained by subtracting the working current before the first set time period from the current working current of the air compressor is greater than the corresponding set upper limit value, it is judged that the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold value; or when the difference obtained by subtracting the current working current from the working current before the first set time period of the air compressor is greater than the corresponding set upper limit value, it is judged that the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold value, as long as it can reflect that the difference between the current working current of the air compressor and the working current before the first set time period is large.

[0039] In addition, in this embodiment, when judging that the working current of the air compressor continuously satisfies the first set condition, the corresponding duration of the judgment is preferably less than the first set duration, that is, the time interval (first set duration) corresponding to the comparison of whether the current changes is preferably not included in the time window for judging (judgment that the working current of the air compressor continuously satisfies the first set condition); for the specific principle, refer to Figure 3 Since the working current of the air compressor after the dryer is unloaded often changes rapidly, the change time is usually short and the amplitude is large, so the set change threshold is also large. It is usually necessary to ensure that the time interval corresponding to the comparison of whether the current changes can simultaneously obtain the current value before unloading and the current value after unloading, so that the absolute value of the difference between the current working current of the air compressor and the working current before the first set time length is sufficient to characterize the large change in the working current of the air compressor after the dryer is unloaded; and in order to ensure that the time interval corresponding to the comparison of whether the current changes can simultaneously obtain the current value before unloading and the current value after unloading, the value of the first set time length is generally relatively long, for example, longer than the air compressor after the dryer is unloaded. The duration of the judgment is usually shorter than the duration of the time period in which the working current of the air compressor changes at a larger rate after the dryer is unloaded, in order to avoid that the condition cannot be met forever; however, in the case that the working current drop process of the air compressor after the dryer is unloaded takes a long time, the judgment time slightly longer than the set time may also be able to meet the condition, but the overall risk is greater; therefore, the duration corresponding to the judgment is usually set to be less than the first set time; specifically, the specific settings to ensure that the duration corresponding to the judgment is less than the first set time are: the total judgment time for consecutively judging that the working current of the air compressor meets the first set condition is less than the first set time; and the second set time is less than the first set time.

[0040] Dryer unloading state judgment system embodiment

[0041] This embodiment provides a technical solution for a dryer unloading state judgment system, which includes a processor having executable program instructions stored therein, and the executable program instructions are used to be executed to implement the dryer unloading state judgment method in the above-mentioned dryer unloading state judgment method embodiment.

[0042] Since the specific working mode and working principle of the dryer unloading state judgment system of this embodiment have been described in detail in the above-mentioned dryer unloading state judgment method embodiment, they will not be repeated here.

[0043] Air compressor control method embodiment

[0044] This embodiment provides a technical solution for an air compressor control method, which determines the unloading state of the dryer by judging the downward trend of the air compressor working current to achieve shutdown control of the air compressor; Figure 4 , the method specifically comprises:

[0045] If it is determined that the working current of the air compressor continuously meets the first set condition, it is determined that the dryer is in an unloading state; when it is determined that the dryer is in an unloading state, the air compressor is controlled to stop;

[0046] The first setting condition is that the current working current of the air compressor is less than the working current before the first setting time, and the difference between the current working current and the working current before the first setting time exceeds the set variation range.

[0047] Therefore, it is equivalent to determining that the working current of the air compressor has a substantial downward trend through the continuous and substantial decline in the working current of the air compressor. After analysis, the change in load when the air compressor is working normally (the dryer is not unloaded) and the dryer is unloaded will cause a change in the working current. That is, after the dryer is unloaded, the working current will obviously show a significant downward trend from the data. By utilizing the characteristic of the continuous relative change in the working current of the air compressor caused by the downward trend, the dryer unloading can be conveniently and accurately determined through the relative change between the current working current and the working current in the previous period. There is no need to install a pressure sensor or pay attention to the working current level of the air compressor under normal conditions and under dryer unloading conditions. It is only necessary to pay attention to whether the working current of the air compressor shows an obvious downward trend. Therefore, even in the case of changes in the air compressor voltage platform, there is basically no need to recalibrate the relevant threshold parameters. It has strong adaptability and can be flexibly applied to more different air compressor shutdown control scenarios.

[0048] Among them, the manner of judging that the working current of the air compressor continuously satisfies the first setting condition includes: judging that the working current of the air compressor satisfies the first setting condition for multiple consecutive times, or judging that the working current of the air compressor satisfies the first setting condition for a second setting time. That is, the working current of the air compressor can be judged as continuously satisfying the condition if it satisfies the first setting condition for a certain period of time, or it can be judged as continuously satisfying the condition if the working current of the air compressor satisfies the first setting condition for a certain number of judgments, and the specific selection can be flexibly made according to actual needs.

[0049] Methods for determining whether the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold include:

[0050] If the difference between the current working current of the air compressor and the working current before the first set time is less than the set lower limit, it is determined that the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold. In this embodiment, the set lower limit is -2A, the judgment duration (the total judgment duration and the second set duration for multiple consecutive judgments that the working current of the air compressor meets the first set condition) is 0.4 seconds, and the first set duration is 1 second. The difference between the current working current of the air compressor and the working current 1 second ago is calculated in real time. If it lasts for 0.4 seconds and the calculation results are all negative and less than -2A, it can be determined that the dryer has been unloaded. The specific set lower limit, the judgment duration or the number of judgments, and the set duration can be adaptively set based on the compatibility of different platforms.

[0051] In other embodiments, the method for judging whether the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold value can also be that when the absolute value of the difference obtained by subtracting the working current before the first set time period from the current working current of the air compressor is greater than the corresponding set upper limit value, it is judged that the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold value; or when the difference obtained by subtracting the current working current from the working current before the first set time period of the air compressor is greater than the corresponding set upper limit value, it is judged that the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold value, as long as it can reflect that the difference between the current working current of the air compressor and the working current before the first set time period is large.

[0052] In addition, in the present embodiment, when judging that the working current of the air compressor continuously satisfies the first set condition, the corresponding duration of the judgment is preferably less than the first set time length, that is, the time interval (first set time length) corresponding to the comparison of whether the current changes is preferably not included in the time window for making the judgment (judgment that the working current of the air compressor continuously satisfies the first set condition); since the working current of the air compressor changes rapidly after the dryer is unloaded, the change time is usually short and the amplitude is large, so the set change threshold is also large, and it is usually necessary to ensure that the time interval corresponding to the comparison of whether the current changes can simultaneously obtain the current value before unloading and the current value after unloading, so that the absolute value of the difference between the current of the air compressor and the working current before the first set time length is sufficient to characterize the large change in the working current of the air compressor after the dryer is unloaded; and to ensure that the time interval corresponding to the comparison of whether the current changes is When the time interval can simultaneously obtain the current value before unloading and the current value after unloading, the value of the first set time length is generally relatively long, for example, longer than the time period in which the working current change rate of the air compressor is large after the dryer is unloaded; and the judgment duration usually needs to be shorter than the time period in which the working current change rate of the air compressor is large after the dryer is unloaded to avoid never meeting the condition; however, in the case that the working current drop process of the air compressor after the dryer is unloaded takes a long time, the judgment time slightly longer than the first set time length may also be able to meet the condition, but the overall risk is greater; therefore, the judgment corresponding duration is usually set to be less than the first set time length; specifically, the specific setting to ensure that the judgment corresponding duration is less than the first set time length is: the total judgment duration for multiple consecutive judgments that the working current of the air compressor meets the first set condition is less than the first set time length; and the second set time length is less than the first set time length.

[0053] Air compressor control system implementation example

[0054] This embodiment provides a technical solution for an air compressor control system, which includes a processor having executable program instructions stored therein, and the executable program instructions are used to be executed to implement the air compressor control method in the above-mentioned air compressor control method embodiment.

[0055] Since the specific working mode and working principle of the air compressor control system of this embodiment have been described in detail in the above-mentioned air compressor control method embodiment, they will not be repeated here.

[0056] The present invention has the following characteristics:

[0057] Through the continuous and significant decrease in the working current of the air compressor, it is determined that the working current of the air compressor has a significant downward trend. After analysis, the change in load when the air compressor works normally (the dryer is not unloaded) and the dryer is unloaded will cause a change in the working current. That is, after the dryer is unloaded, the working current will obviously show a significant downward trend from the data. By utilizing the characteristic of the continuous relative change of the working current of the air compressor caused by the downward trend, the unloading of the dryer can be easily and accurately determined by the relative change between the current working current and the working current in the previous period. There is no need to install a pressure sensor, nor to pay attention to the working current level of the air compressor under normal conditions and under dryer unloading conditions. It is only necessary to pay attention to whether the working current of the air compressor shows an obvious downward trend. Therefore, even in the case of changes in the air compressor voltage platform, there is basically no need to recalibrate the relevant threshold parameters. It has strong adaptability and can be flexibly applied to more different air compressor working conditions.

[0058] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, but do not constitute a limitation to the present invention.

Claims

1. A method for determining the unloading state of a dryer, characterized in that: If it is determined that the working current of the air compressor continuously satisfies the first set condition, it is determined that the dryer is in an unloading state; The first setting condition is that the current working current of the air compressor is less than the working current before the first setting time, and the difference between the current working current and the working current before the first setting time exceeds the corresponding setting change threshold.

2. The method for determining the unloading state of a dryer according to claim 1, characterized in that: The manner of determining that the working current of the air compressor continuously satisfies the first setting condition includes: determining that the working current of the air compressor satisfies the first setting condition for multiple consecutive times, or determining that the working current of the air compressor satisfies the first setting condition for a second setting period of time.

3. The method for determining the unloading state of a dryer according to claim 2, characterized in that: The total duration of the continuous multiple determinations that the working current of the air compressor meets the first set condition is less than the first set duration; and the second set duration is less than the first set duration.

4. The method for determining the unloading state of a dryer according to any one of claims 1 to 3, characterized in that: Methods for determining whether the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold include: If the difference between the current working current of the air compressor and the working current before the first set time is less than the set lower limit, it is determined that the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold.

5. A dryer unloading state judgment system, characterized in that: It comprises a processor, in which executable program instructions are stored, and the executable program instructions are used to be executed to implement the dryer unloading state judgment method according to any one of claims 1-4.

6. A method for controlling an air compressor, when it is determined that the dryer is in an unloading state, controlling the air compressor to stop, characterized in that: If it is determined that the working current of the air compressor continuously satisfies the first set condition, it is determined that the dryer is in an unloading state; The first setting condition is that the current working current of the air compressor is less than the working current before the first setting time, and the difference between the current working current of the air compressor and the working current before the first setting time exceeds the corresponding setting change threshold.

7. The air compressor control method according to claim 6, characterized in that: The manner of determining that the working current of the air compressor continuously satisfies the first setting condition includes: determining that the working current of the air compressor satisfies the first setting condition for multiple consecutive times, or determining that the working current of the air compressor satisfies the first setting condition for a second setting period of time.

8. The air compressor control method according to claim 7, characterized in that: The total duration of the continuous multiple determinations that the working current of the air compressor meets the first set condition is less than the first set duration; and the second set duration is less than the first set duration.

9. The air compressor control method according to any one of claims 6 to 8, characterized in that: Methods for determining whether the difference between the current working current of the air compressor and the working current before the first set time period exceeds the corresponding set change threshold include: If the difference between the current working current of the air compressor and the working current before the first set time is less than the set lower limit, it is determined that the difference between the current working current of the air compressor and the working current before the first set time exceeds the corresponding set change threshold.

10. An air compressor control system, characterized in that: It includes a processor, in which executable program instructions are stored, and the executable program instructions are used to be executed to implement the air compressor control method as described in any one of claims 6-9.

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