CN110749135B

CN110749135B - Control method of compressor unit, storage medium, electronic device and system

Info

Publication number: CN110749135B
Application number: CN201911019679.8A
Authority: CN
Inventors: 袁林成; 张国华; 徐康
Original assignee: Shanghai Landleaf Building Technology Co ltd
Current assignee: Shanghai Landleaf Building Technology Co ltd
Priority date: 2019-10-24
Filing date: 2019-10-24
Publication date: 2021-04-27
Anticipated expiration: 2039-10-24
Also published as: CN110749135A

Abstract

The invention provides a control method, a storage medium, an electronic device and a system of a compressor unit, wherein the method comprises the following steps: s1, collecting the air suction temperature Tsh _ State, the exhaust temperature Dsh _ State, the air suction pressure Lp and the exhaust pressure Hp of the compressor; s2, obtaining a saturation temperature Tc corresponding to the suction pressure Lp and a corresponding saturation temperature Te respectively from the discharge pressure Hp according to the pressure and saturation temperature comparison table; s3, calculating the actual air suction superheat Tsh and the actual exhaust superheat Dsh; s4, acquiring an initial target value Dsh _ T of the exhaust superheat degree; s5, comparing and analyzing the actual air suction superheat degree and the upper and lower limit values of the air suction superheat degree, then comparing and analyzing the actual exhaust superheat degree and the upper and lower limit values of the exhaust superheat degree, determining the working condition of the compressor, and adjusting the target value of the current exhaust superheat degree. The invention correspondingly adjusts the target value of the exhaust superheat degree under different working conditions, has stronger adaptability and is easier to operate the compressor in the optimal state.

Description

Control method of compressor unit, storage medium, electronic device and system

Technical Field

The present invention relates to the field of compressor control, and in particular, to a method, a storage medium, an electronic device, and a system for controlling a compressor unit.

Background

In order to ensure the normal operation of the air handling unit, the exhaust superheat degree of the compressor is generally required to be controlled. The current control method is generally to set a fixed target exhaust superheat degree, and then to perform regulation control through the target exhaust superheat degree. However, under different parameter conditions, the compressor is corresponding to various working conditions. For the working condition of the compressor, the problems that the compressor is unreliable in operation or operates with liquid and the like are easily caused by uniformly adopting a fixed and unchangeable target exhaust superheat degree.

Disclosure of Invention

The invention aims to provide a control method, a storage medium, electronic equipment and a system of a compressor unit, which can realize corresponding adjustment of a target value of exhaust superheat degree under different working conditions, have stronger adaptability and ensure that a compressor can be operated in an optimal state more easily.

The technical scheme provided by the invention is as follows:

the invention provides a control method of a compressor unit, which is characterized by comprising the following steps:

s1, collecting the air suction temperature Tsh _ State, the exhaust temperature Dsh _ State, the air suction pressure Lp and the exhaust pressure Hp of the compressor;

s2, obtaining a saturation temperature Tc corresponding to the suction pressure Lp and a corresponding saturation temperature Te respectively from the discharge pressure Hp according to the pressure and saturation temperature comparison table;

s3, calculating an actual air suction superheat Tsh and an actual exhaust superheat Dsh, wherein Tsh is Tsh _ State-Tc, and Dsh is Dsh _ State-Te;

s4, acquiring an initial target value Dsh _ T of the exhaust superheat degree;

s5 compares and analyzes the actual air suction superheat degree and the upper and lower air suction superheat degrees, then compares and analyzes the actual exhaust superheat degree and the upper and lower exhaust superheat degrees, determines the working condition of the compressor, adjusts the current exhaust superheat degree target value, the target exhaust superheat degree target value obtained after each adjustment is the current exhaust superheat degree target value adjusted next time, and the current exhaust superheat degree target value adjusted first time is the initial exhaust superheat degree target value.

Further, S5 compares and analyzes the actual intake superheat and the intake superheat upper and lower limits, then compares and analyzes the actual exhaust superheat and the exhaust superheat upper and lower limits, determines the operating condition of the compressor, and adjusts the current exhaust superheat target value specifically includes:

s51, if the actual air suction superheat degree is larger than or equal to the lower limit value of the air suction superheat degree, analyzing and comparing the actual air suction superheat degree and the upper limit value of the air suction superheat degree;

s52, if the actual suction superheat is smaller than the suction superheat lower limit value, calculating a first difference value between the actual suction superheat and the suction superheat lower limit value;

s521, when the first difference is smaller than a first threshold value, calculating a second difference between the actual exhaust superheat degree and a current exhaust superheat degree target value;

s5211, if the second difference value is smaller than or equal to a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value, controlling the compressor according to the current exhaust superheat target value;

s5212, if the second difference is smaller than or equal to a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s52121, controlling the compressor according to the next exhaust superheat target value within first preset time;

s52122, after a first preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

s5213 if the second difference is larger than a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value, controlling the compressor according to the current exhaust superheat target value;

s5214, if the second difference is larger than a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s52141, controlling the compressor according to the next exhaust superheat target value within second preset time;

and S52142, after a second preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value.

Further, if the actual intake superheat is less than the intake superheat lower limit value, step S52 includes, after calculating a first difference between the actual intake superheat and the intake superheat lower limit value:

s522, when the first difference is larger than or equal to a first threshold value, calculating a second difference between the actual exhaust superheat degree and the current exhaust superheat degree target value;

s5221, if the second difference value is smaller than or equal to a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value, controlling the compressor according to the current exhaust superheat target value;

s5222, if the second difference is smaller than or equal to a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s52221 controlling the compressor according to the next exhaust superheat target value within a third preset time;

s52222 after a third preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

s5223, if the second difference is larger than a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value, controlling the compressor according to the current exhaust superheat target value;

s5224, if the second difference is larger than a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s52241, controlling the compressor according to the next exhaust superheat target value within the fourth preset time;

after the fourth preset time of S52242, the next exhaust superheat target value is analyzed and adjusted as a new current exhaust superheat target value.

Further, if the actual degree of superheat of inhaled air is greater than or equal to the lower limit of the degree of superheat of inhaled air at S51, the analyzing and comparing the actual degree of superheat of inhaled air with the upper limit of the degree of superheat of inhaled air specifically comprises:

s511, if the actual air suction superheat degree is larger than or equal to the lower limit value of the air suction superheat degree and the actual air suction superheat degree is smaller than or equal to the upper limit value of the air suction superheat degree, controlling the compressor according to the current exhaust superheat degree target value;

s512, if the actual air suction superheat degree is larger than or equal to the lower limit value of the air suction superheat degree and the actual air suction superheat degree is larger than the upper limit value of the air suction superheat degree, calculating a third difference value between the actual air suction superheat degree and the upper limit value of the air suction superheat degree;

s5121, when the third difference is smaller than a third threshold, calculating a second difference between the actual exhaust superheat degree and the current exhaust superheat degree target value;

s51211, if the second difference is smaller than or equal to a second threshold value and the current exhaust superheat target value is smaller than the exhaust superheat lower limit value, controlling the compressor according to the current exhaust superheat target value;

s51212 if the second difference is smaller than or equal to a second threshold and the current exhaust superheat target value is sprinkled to be equal to the lower exhaust superheat value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s512121, controlling the compressor according to the next exhaust superheat target value within fifth preset time;

after the fifth preset time of S512122, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

s51213 if the second difference is larger than a second threshold and the current exhaust superheat target value is smaller than the lower exhaust superheat limit value, controlling the compressor according to the current exhaust superheat target value;

s51214, if the second difference is larger than a second threshold value and the current exhaust superheat target value is larger than or equal to the exhaust superheat lower limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s512141, controlling the compressor according to the next exhaust superheat target value within sixth preset time;

and S512142, after the sixth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value.

Further, if the actual intake superheat is greater than or equal to the lower limit of the intake superheat and the actual intake superheat is greater than the upper limit of the intake superheat in S512, calculating a third difference between the actual intake superheat and the upper limit of the intake superheat further includes:

s5122, when the third difference is larger than or equal to a third threshold, calculating a second difference between the actual exhaust superheat degree and the current exhaust superheat degree target value;

s51221, if the second difference is larger than or equal to a second threshold and the current exhaust superheat target value is smaller than the exhaust superheat lower limit value, controlling the compressor according to the current exhaust superheat target value;

s51222, if the second difference is larger than or equal to a second threshold value and the current exhaust superheat target value is larger than or equal to the exhaust superheat lower limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s512221, controlling the compressor according to the next exhaust superheat target value within the seventh preset time;

after the seventh preset time of S512222, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

s51223, if the second difference value is smaller than a second threshold value and the current exhaust superheat degree target value is smaller than the exhaust superheat degree lower limit value, controlling the compressor according to the current exhaust superheat degree target value;

s51224 if the second difference is smaller than a second threshold and the current exhaust superheat target value is larger than or equal to the lower exhaust superheat limit, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value;

s512241, controlling the compressor according to the next exhaust superheat target value within eighth preset time;

and S512242, after the eighth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value.

The present invention also provides a storage medium having a computer program stored thereon, characterized in that: the computer program, when executed by a processor, implements the method of any of claims 1 to 5.

The present invention also provides an electronic device including a memory and a processor, the memory having stored thereon a computer program that runs on the processor, wherein: the processor, when executing the computer program, implements the method of any of claims 1 to 5.

The present invention also provides a control system for a compressor unit, comprising:

the data acquisition module is used for acquiring the air suction temperature Tsh _ State, the exhaust temperature Dsh _ State, the air suction pressure Lp and the exhaust pressure Hp of the compressor;

the data processing module is used for obtaining a saturation temperature Tc corresponding to the suction pressure Lp and a corresponding saturation temperature Te respectively obtained by the discharge pressure Hp which are collected by the data collection module according to a pressure and saturation temperature comparison table;

the data calculation module is used for calculating the actual air suction superheat Tsh and the actual exhaust superheat Dsh according to the data obtained by the data acquisition module and the data processing module, wherein Tsh is Tsh _ State-Tc, and Dsh is Dsh _ State-Te;

a target value acquisition module for acquiring an initial target value of the exhaust superheat degree;

and the processing module is used for comparing and analyzing the actual air suction superheat degree obtained by the data calculation module with the upper and lower limit values of the air suction superheat degree, then comparing and analyzing the actual air discharge superheat degree obtained by the data calculation module with the upper and lower limit values of the air discharge superheat degree, determining the working condition of the compressor, adjusting the current air discharge superheat degree target value, wherein the target air discharge superheat degree target value obtained after each adjustment is the current air discharge superheat degree target value of the next adjustment, and the current air discharge superheat degree target value of the first adjustment is the initial air discharge superheat degree target value.

Further, the processing module specifically includes:

the analysis unit is used for analyzing and comparing the actual air suction superheat degree with an air suction superheat degree upper limit value if the actual air suction superheat degree is larger than or equal to an air suction superheat degree lower limit value;

the analysis unit is used for calculating a first difference value between the actual suction superheat degree and the lower limit value of the suction superheat degree if the actual suction superheat degree is smaller than the lower limit value of the suction superheat degree;

the calculating unit is used for calculating a second difference value between the actual exhaust superheat degree and the current exhaust superheat degree target value when the first difference value obtained by the analyzing unit is smaller than a first threshold value;

the processing unit is used for controlling the compressor according to the current exhaust superheat target value if the second difference value obtained by the calculating unit is smaller than or equal to a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value; if the second difference is smaller than or equal to a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within a first preset time; after the first preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

the processing unit is used for controlling the compressor according to the current exhaust superheat target value if the second difference value obtained by the calculating unit is larger than a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value; if the second difference is larger than a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within second preset time; after a second preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

the calculating unit is used for calculating a second difference value between the actual exhaust superheat degree and the current exhaust superheat degree target value when the first difference value obtained by the analyzing unit is larger than or equal to a first threshold value;

the processing unit is used for controlling the compressor according to the current exhaust superheat target value if the second difference value obtained by the calculating unit is smaller than or equal to a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value; if the second difference is smaller than or equal to a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within a third preset time; after a third preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

the processing unit is used for controlling the compressor according to the current exhaust superheat target value if the second difference value obtained by the calculating unit is larger than a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value; if the second difference is larger than a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within the fourth preset time; and after the fourth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value.

Further, the analysis unit specifically includes:

the processing subunit is used for controlling the compressor according to the current exhaust superheat target value if the actual air suction superheat is greater than or equal to the lower limit value of the air suction superheat and the actual air suction superheat is less than or equal to the upper limit value of the air suction superheat; if the actual suction superheat degree is larger than or equal to the lower limit value of the suction superheat degree and the actual suction superheat degree is larger than the upper limit value of the suction superheat degree, calculating a third difference value between the actual suction superheat degree and the upper limit value of the suction superheat degree;

the calculating subunit is used for calculating a second difference value between the actual exhaust superheat degree and the current exhaust superheat degree target value when the third difference value obtained by the processing subunit is smaller than a third threshold value;

the processing subunit is used for controlling the compressor according to the current exhaust superheat target value if the second difference value obtained by the calculating subunit is smaller than or equal to a second threshold value and the current exhaust superheat target value is smaller than the exhaust superheat lower limit value; if the second difference is smaller than or equal to a second threshold value and the current exhaust superheat target value is sprinkled to be equal to the lower exhaust superheat value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within the fifth preset time; after a fifth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

the processing subunit is used for controlling the compressor according to the current exhaust superheat target value if the second difference obtained by the calculating subunit is larger than a second threshold value and the current exhaust superheat target value is smaller than the exhaust superheat lower limit value; if the second difference is larger than a second threshold value and the current exhaust superheat target value is larger than or equal to the exhaust superheat lower limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within the sixth preset time; after the sixth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

the calculating subunit calculates a second difference between the actual exhaust superheat and the current exhaust superheat target value when the third difference is greater than or equal to a third threshold;

the processing subunit is used for controlling the compressor according to the current exhaust superheat target value if the second difference value obtained by the calculating subunit is greater than or equal to a second threshold value and the current exhaust superheat target value is smaller than the exhaust superheat lower limit value; if the second difference is larger than or equal to a second threshold value, and the current exhaust superheat target value is larger than or equal to the exhaust superheat lower limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within the seventh preset time; after the seventh preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value; if the second difference is smaller than a second threshold value and the current exhaust superheat target value is smaller than the exhaust superheat lower limit value, controlling the compressor according to the current exhaust superheat target value; if the second difference is smaller than a second threshold value and the current exhaust superheat target value is larger than or equal to the exhaust superheat lower limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within eighth preset time; and after the eighth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value.

The control method, the storage medium, the electronic device and the system of the compressor unit provided by the invention can bring at least one of the following beneficial effects:

1. according to the invention, the target superheat degree can be adjusted under different working conditions, the adaptability is stronger, and the compressor can be operated in the optimal state more easily.

2. According to the invention, the exhaust superheat is corrected according to the suction superheat, so that the unit performance is more stable.

Drawings

The above features, technical features, advantages and implementations of a method for controlling a compressor assembly, a storage medium, an electronic device and a system will be further described in the following description of preferred embodiments in a clearly understandable manner with reference to the accompanying drawings.

FIG. 1 is a flow chart of one embodiment of a method of controlling a compressor rack of the present invention;

fig. 2 is a flowchart of another embodiment of a control method of a compressor rack of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will explain specific embodiments of the present invention with reference to the drawings of the specification. It is obvious that the drawings in the following description are only some examples of the invention, from which other drawings and embodiments can be derived by a person skilled in the art without inventive effort.

For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".

In an embodiment of the present invention, as shown in fig. 1, a method for controlling a compressor unit includes:

s4, acquiring an initial target value Dsh _ T of the exhaust superheat degree;

Specifically, in this embodiment, after the unit is powered on and started, the heating mode is started. The method comprises the steps of collecting the actual air suction temperature Tsh _ State, the actual exhaust temperature Dsh _ State, the air suction pressure Lp and the exhaust pressure Hp of the compressor in real time, and outputting an accurate value after AD conversion, namely converting a digital value into an analog quantity. Then, by inquiring a pressure and saturation temperature comparison table, the saturation temperature Tc corresponding to the suction pressure Lp and the saturation temperature Te corresponding to the exhaust pressure Hp are obtained through conversion calculation. And then, combining the acquired and calculated related data to calculate the actual air suction superheat Tsh and the actual exhaust superheat Dsh, wherein Tsh is Tsh _ State-Tc, and Dsh is Dsh _ State-Te.

The initial target value Dsh _ T of the exhaust superheat degree is obtained, the initial target value can be selected based on experimental results because the initial target value of the exhaust superheat degree can be maintained to control the operation of the compressor in the later period, on the other hand, because a series of step-in logics are adopted to adjust and correct the target value, one initial target value can be optionally set, and then the adjustment is carried out in the later period.

And then comparing and analyzing the actual air suction superheat degree and the upper and lower limit values of the air suction superheat degree and the actual exhaust superheat degree and the upper and lower limit values of the exhaust superheat degree, thereby determining different working conditions of the compressor, and adopting corresponding measures under each working condition to adjust the current exhaust superheat degree target value. The upper and lower limit values of the suction superheat degree and the exhaust superheat degree are determined according to the range of the unit operation working conditions. In addition, after the unit is electrified and started, the current exhaust superheat target value in the first adjustment is the initial exhaust superheat target value, and then the target exhaust superheat target value obtained in each adjustment is the current exhaust superheat target value of the next adjustment. And defining a process of comparing and analyzing the actual air suction superheat value and the upper and lower air suction superheat values and obtaining a next air discharge superheat target value by the actual air discharge superheat value and the upper and lower air discharge superheat values on the basis of the current air discharge superheat target value as a primary adjustment and correction process, and repeating the adjustment and correction process in the whole working process of the compressor in the heating mode.

The invention adopts different modes to adjust the target superheat degree aiming at the working condition under different working conditions, the adaptability is stronger, and the compressor is easier to operate in the optimal state.

Another embodiment of the present invention is a preferred embodiment of the above embodiment, as shown in fig. 2, wherein Dsh _ T is DSHTarge, i.e. the target value of the superheat of the exhaust gas. Compared with the above embodiment, the main improvement of this embodiment is that S5 compares and analyzes the actual intake superheat and the intake superheat upper and lower limits, then compares and analyzes the actual exhaust superheat and the exhaust superheat upper and lower limits, determines the operating condition of the compressor, and adjusting the current exhaust superheat target value specifically includes:

s52142, after a second preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

Specifically, in this embodiment, after the unit is powered on and started, the heating mode is started. The method comprises the steps of collecting the actual air suction temperature Tsh _ State, the actual exhaust temperature Dsh _ State, the air suction pressure Lp and the actual exhaust pressure Hp of the compressor in real time, and obtaining the saturation temperature Tc corresponding to the air suction pressure Lp and the saturation temperature Te corresponding to the exhaust pressure Hp through conversion calculation by inquiring a pressure and saturation temperature comparison table. And then, combining the acquired and calculated related data to calculate the actual air suction superheat Tsh and the actual exhaust superheat Dsh, wherein Tsh is Tsh _ State-Tc, and Dsh is Dsh _ State-Te. Then, an initial target value Dsh _ T of the degree of superheat of exhaust gas is acquired.

And then, firstly comparing the actual air suction superheat Tsh with a lower limit value of the air suction superheat, if the actual air suction superheat is lower than the lower limit value, further analyzing a first comparison result of a first difference value between the actual air suction superheat and the lower limit value of the air suction superheat and a first threshold, analyzing a second comparison result of a second difference value between the actual exhaust superheat and a current exhaust superheat target value and a second threshold, and analyzing a third comparison result between the current exhaust superheat target value and an exhaust superheat upper limit value, wherein the permutation and combination of the first comparison result, the second comparison result and the third comparison result correspond to eight adjustment modes of the current exhaust superheat target value. The first threshold and the second threshold can be obtained according to experimental tests.

The adjusting mode comprises the steps of keeping, increasing or reducing the current exhaust superheat target value, then controlling the compressor according to the next exhaust superheat target value after adjustment, and continuing for corresponding preset time, wherein the increasing or decreasing numerical values and the delay time of the current exhaust superheat target values corresponding to different working conditions can be the same or different.

In another embodiment of the present invention, if the actual degree of superheat of intake air is greater than or equal to the lower limit of the degree of superheat of intake air, the analyzing and comparing the actual degree of superheat of intake air with the upper limit of the degree of superheat of intake air specifically includes: s511, if the actual air suction superheat degree is larger than or equal to the lower limit value of the air suction superheat degree and the actual air suction superheat degree is smaller than or equal to the upper limit value of the air suction superheat degree, controlling the compressor according to the current exhaust superheat degree target value; s512, if the actual air suction superheat degree is larger than or equal to the lower limit value of the air suction superheat degree and the actual air suction superheat degree is larger than the upper limit value of the air suction superheat degree, calculating a third difference value between the actual air suction superheat degree and the upper limit value of the air suction superheat degree; s5121, when the third difference is smaller than a third threshold, calculating a second difference between the actual exhaust superheat degree and the current exhaust superheat degree target value; s51211, if the second difference is smaller than or equal to a second threshold value and the current exhaust superheat target value is smaller than the exhaust superheat lower limit value, controlling the compressor according to the current exhaust superheat target value; s51212 if the second difference is smaller than or equal to a second threshold and the current exhaust superheat target value is sprinkled to be equal to the lower exhaust superheat value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; s512121, controlling the compressor according to the next exhaust superheat target value within fifth preset time; after the fifth preset time of S512122, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value; s51213 if the second difference is larger than a second threshold and the current exhaust superheat target value is smaller than the lower exhaust superheat limit value, controlling the compressor according to the current exhaust superheat target value; s51214, if the second difference is larger than a second threshold value and the current exhaust superheat target value is larger than or equal to the exhaust superheat lower limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; s512141, controlling the compressor according to the next exhaust superheat target value within sixth preset time; and S512142, after the sixth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value.

Specifically, in the above embodiment, after the actual air suction superheat Tsh is compared with the lower limit of the air suction superheat, if the actual air suction superheat is not lower than the lower limit, a fourth comparison result between the air suction superheat Tsh and the lower limit of the air suction superheat, a fifth comparison result between a third difference between the actual air suction superheat and the upper limit of the air suction superheat and a third threshold, a sixth comparison result between a second difference between the actual exhaust superheat and the current exhaust superheat target value and the second threshold, a seventh comparison result between the current exhaust superheat target value and the lower limit of the exhaust superheat, and a combination of the fourth comparison result, the fifth comparison result, the sixth comparison result, and the seventh comparison result correspond to nine adjustment manners for the current exhaust superheat target value. The third threshold value thereof.

According to the invention, the exhaust superheat degree is corrected according to the suction superheat degree under different working conditions, so that the unit performance is more stable.

In one embodiment of the present invention, a control system for a compressor unit includes:

the data calculation module is used for calculating the actual air suction superheat Tsh and the actual exhaust superheat Dsh according to the data obtained by the data acquisition module and the data processing module, wherein,

the processing module is used for comparing and analyzing the actual air suction superheat degree obtained by the data calculation module with the upper and lower limit values of the air suction superheat degree, then comparing and analyzing the actual air discharge superheat degree obtained by the data calculation module with the upper and lower limit values of the air discharge superheat degree, determining the working condition of the compressor, adjusting the current air discharge superheat degree target value, wherein the target air discharge superheat degree target value obtained after each adjustment is the current air discharge superheat degree target value of the next adjustment, and the current air discharge superheat degree target value of the first adjustment is the initial air discharge superheat degree target value;

the processing module specifically comprises:

the processing unit is used for controlling the compressor according to the current exhaust superheat target value if the second difference value obtained by the calculating unit is larger than a second threshold value and the current exhaust superheat target value is larger than the exhaust superheat upper limit value; if the second difference is larger than a second threshold value and the current exhaust superheat target value is smaller than or equal to the exhaust superheat upper limit value, adjusting the current exhaust superheat target value to obtain a next exhaust superheat target value; controlling the compressor according to the next exhaust superheat target value within the fourth preset time; after the fourth preset time, analyzing and adjusting the next exhaust superheat target value as a new current exhaust superheat target value;

the analysis unit specifically includes:

The specific operation modes of the modules in this embodiment have been described in detail in the corresponding method embodiments, and thus are not described in detail again.

An embodiment of the invention provides a computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out all or part of the method steps of the first embodiment.

The present invention can implement all or part of the flow in the method of the first embodiment, and can also be implemented by using a computer program to instruct related hardware, where the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.

An embodiment of the present invention further provides an electronic device, which includes a memory and a processor, wherein the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of the method steps in the first embodiment.

The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like which is the control center for the computer device and which connects the various parts of the overall computer device using various interfaces and lines.

The memory may be used to store the computer programs and/or modules, and the processor may implement various functions of the computer device by running or executing the computer programs and/or modules stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, video data, etc.) created according to the use of the cellular phone, etc. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.

It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A method of controlling a compressor unit, comprising:

s4, acquiring an initial target value Dsh _ T of the exhaust superheat degree;

s5, comparing and analyzing the actual air suction superheat degree and the upper and lower air suction superheat degrees, then comparing and analyzing the actual exhaust superheat degree and the upper and lower exhaust superheat degrees, determining the working condition of the compressor, adjusting the current exhaust superheat degree target value, wherein the target exhaust superheat degree target value obtained after each adjustment is the current exhaust superheat degree target value of the next adjustment, and the current exhaust superheat degree target value of the first adjustment is the initial exhaust superheat degree target value;

s5 comparing and analyzing the actual air suction superheat degree and the upper and lower air suction superheat degrees, then comparing and analyzing the actual exhaust superheat degree and the upper and lower exhaust superheat degrees, determining the working condition of the compressor, and adjusting the target value of the current exhaust superheat degree specifically comprises the following steps:

2. The method for controlling a compressor unit according to claim 1, wherein step S52, if the actual degree of superheat of intake air is less than a lower limit value of the degree of superheat of intake air, further comprises, after calculating a first difference between the actual degree of superheat of intake air and the lower limit value of the degree of superheat of intake air:

3. The method for controlling the compressor unit according to claim 2, wherein the step S51 of analyzing and comparing the actual suction superheat and the upper limit value of the suction superheat specifically comprises, if the actual suction superheat is greater than or equal to the lower limit value of the suction superheat:

4. The method for controlling a compressor unit according to claim 3, wherein step S512, if the actual suction superheat is greater than or equal to a lower suction superheat limit and the actual suction superheat is greater than an upper suction superheat limit, further comprises, after calculating a third difference between the actual suction superheat and the upper suction superheat limit:

5. A storage medium having a computer program stored thereon, characterized in that: the computer program, when executed by a processor, implements the method of any of claims 1 to 4.

6. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program that runs on the processor, characterized in that: the processor, when executing the computer program, implements the method of any of claims 1 to 4.

7. A control system for a compressor unit, comprising:

the processing module specifically comprises:

8. The control system of a compressor group according to claim 7, wherein the analysis unit comprises in particular: