Control method of air compressor for charging pile production

Abstract

The invention relates to a control method of an air compressor for charging pile production, and belongs to the field of air compressor energy-saving control. The pressure transmitters used for detecting the air pressure are arranged at all the air using ends, and whether the operation frequency of the air compressor is adjusted or not is determined according to the air pressure values fed back by all the air using ends; when the air pressure of at least one air using end is smaller than a correspondingly set first threshold value, the given operation frequency of the air compressor is increased; and when the air pressure of all the air using ends is larger than a correspondingly-set second threshold value, the given operation frequency of the air compressor is reduced. Under the condition that the air pressure of the air supply end is sufficient due to the fact that the aging air resistance of equipment is increased and the sealing performance is reduced, the air compressor operates with power, but the air pressure of the air using end is insufficient, the air pressure of the air using end can be accurately detected due to the fact that the pressure transmitter used for detecting the air pressure is arranged at each air using end; and the problem of insufficient air pressure at the air using end is effectively solved.

Description

Technical Field

[0001] The invention relates to a control method for an air compressor used in charging pile production, and belongs to the field of energy-saving control of air compressors. Background Art

[0002] The air compressor inhales natural air, undergoes multi-stage processing and multi-stage compression, and finally forms high-pressure clean air to supply other equipment. In the production process of charging piles, devices that assist in the production of charging piles require compressed air to provide power. In the production process of charging piles, the gas consumption at the gas-using end will change. If the gas pressure at the gas-using end is not monitored in real time, when there is sufficient air at the gas-using end, the air compressor will still operate at the original frequency, resulting in increased energy consumption; when there is insufficient air at the gas-using end, the air compressor will still operate at the original frequency, resulting in low charging pile assembly efficiency.

[0003] The Chinese patent announcement document with announcement number CN102163044B discloses a variable frequency control device for an air compressor-dryer system. The device detects air pressure at the air compressor end (air delivery end). When the air pressure is less than the set threshold, the operating frequency of the air compressor is increased; when the air pressure is greater than the set threshold, the operating frequency of the air compressor is reduced. This avoids continuous operation at a specific frequency for a long time, effectively reduces energy consumption, and has good energy-saving and air purification effects.

[0004] However, in this solution, since the compressed gas is sent to multiple gas users through an air delivery pipeline, on the production line, some gas users (such as cylinders) are in the process of working, and there is gas flow; some gas users are in the working gap, the gas circuit is in a closed state, and there is no gas flow. If the air compressor power is reduced or the air compressor is stopped only according to the pressure reached at the air delivery end, the air pressure at the gas user end will drop during the working process, and may drop to below the minimum air pressure required by the gas user end, thereby causing insufficient air pressure and affecting the execution result of the gas user end; and from the air delivery end to the gas user end, a dryer and a long transmission pipeline will pass through. As the equipment ages, the air resistance increases and the sealing performance decreases, which will also aggravate the situation that the air pressure at the air delivery end is sufficient and the air compressor power is reduced, but the air pressure at the gas user end may be insufficient, ultimately affecting the production accuracy and production efficiency of the gas user end. Summary of the invention

[0005] The object of the present invention is to provide a control method for an air compressor used in the production of charging piles, so as to solve the problem of insufficient air pressure at the air-using end in the prior art.

[0006] To achieve the above object, the solution of the present invention includes: A control method for an air compressor used in the production of charging piles according to the present invention comprises the following steps: collecting the air pressure of each air-consuming end in real time, and when the air pressure of at least one air-consuming end is less than a corresponding set first threshold, increasing the given operating frequency of the air compressor; when the air pressure of all air-consuming ends is greater than a corresponding set second threshold, reducing the given operating frequency of the air compressor; the first threshold is less than the second threshold.

[0007] Furthermore, the given operating frequency of the air compressor is predicted based on the historical operating frequency of the air compressor.

[0008] Furthermore, a time series forecasting algorithm is used to predict the given running frequency.

[0009] A control system for an air compressor used in the production of charging piles includes a processor, wherein the processor executes a computer program to perform the following steps: real-time collection of the air pressure of each gas-using end, when the air pressure of at least one gas-using end is less than a corresponding set first threshold, increasing the given operating frequency of the air compressor; when the air pressure of all gas-using ends is greater than a corresponding set second threshold, reducing the given operating frequency of the air compressor; the first threshold is less than the second threshold.

[0010] Furthermore, the given operating frequency of the air compressor is predicted based on the historical operating frequency of the air compressor.

[0011] Furthermore, a time series forecasting algorithm is used to predict the given running frequency.

[0012] The beneficial effects of the present invention are as follows: the present invention is an improved invention creation, and the present invention determines whether to adjust the operating frequency of the air compressor according to the air pressure value fed back by each air-using end; when the air pressure of at least one air-using end is less than the corresponding set first threshold value, the given operating frequency of the air compressor is increased; when the air pressure of all air-using ends is greater than the corresponding set second threshold value, the given operating frequency of the air compressor is reduced. Even if the air resistance increases due to aging of the equipment and the sealing performance decreases, resulting in sufficient air pressure at the air supply end and the air compressor will run at full power, but the air pressure at the air-using end is insufficient, the present invention can accurately detect the air pressure at the air-using end because a pressure transmitter for detecting air pressure is set at each air-using end, thereby effectively solving the problem of insufficient air pressure at the air-using end. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an overall architecture of the present invention; Figure 2 It is a schematic diagram of a control terminal of the present invention. DETAILED DESCRIPTION

[0014] 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 in conjunction with the accompanying drawings and embodiments.

[0015] The concept of the present invention is to provide a pressure transmitter at each gas-using end, and to control the air machine according to real-time monitoring of the gas pressure at each gas-using end.

[0016] Method Example: This embodiment provides a control method for an air compressor used in charging pile production. The present invention first predicts today's air compressor operating frequency (given operating frequency) based on the historical operating frequency of the air compressor. However, since the output of the charging pile production line may change, a pressure transmitter for detecting the air pressure value is installed at each gas-using end, such as Figure 1 As shown. Since the air pressure value required by each gas-consuming end is also different, a corresponding air pressure threshold is set for each gas-consuming end, and the air pressure threshold includes an upper limit and a lower limit. When the air pressure values ​​of all gas-consuming ends collected in real time are greater than the corresponding set upper limit air pressure threshold (second threshold), the motor of the air compressor is adjusted by controlling the frequency converter to reduce today's air compressor operating frequency; when the air pressure value of at least one gas-consuming end collected in real time is less than the corresponding set lower limit air pressure threshold (first threshold), the motor of the air compressor is adjusted by controlling the frequency converter to increase today's air compressor operating frequency. Among them, the second threshold is greater than the first threshold, and the control principle of the control end is as follows. Figure 2 shown.

[0017] This embodiment uses a time series prediction algorithm to predict today's operating frequency based on the operating frequency of the air compressor in history (for example, the previous day). The present invention does not limit the prediction model used by the time series prediction algorithm, and uses a large amount of historical data to train the selected prediction model, thereby optimizing the parameters in the model. The prediction performance of the model is verified using a validation set. When the mean square error of the model meets the requirements, it is used as the optimal model, and the optimal model is deployed in the upper computer of the production line. In actual production, the optimal model is used to predict today's operating frequency based on the operating frequency of the air compressor the day before.

[0018] As another implementation, the given operating frequency may also be the frequency at which the air compressor ran for the longest time the previous day.

[0019] In the actual production process, today's given air compressor operating frequency is adjusted according to the real-time collected air pressure at the air-consuming end.

[0020] System Example: This embodiment provides a control system for an air compressor used in the production of charging piles. The computer program executed by the processor in the system is designed using the method described in the method embodiment. Since the introduction to the method is clear enough, it will not be repeated here.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A control method for an air compressor used in charging pile production, characterized in that: The method comprises the following steps: collecting the air pressure of each air-consuming end in real time, and when the air pressure of at least one air-consuming end is less than the corresponding set first threshold, increasing the given operating frequency of the air compressor; when the air pressure of all air-consuming ends is greater than the corresponding set second threshold, reducing the given operating frequency of the air compressor; the first threshold is less than the second threshold.

2. The control method of the air compressor for charging pile production according to claim 1, characterized in that: The given operating frequency of the air compressor is predicted based on the historical operating frequency of the air compressor.

3. The control method of the air compressor for charging pile production according to claim 2 is characterized in that: The given running frequency is predicted using a time series prediction algorithm.

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