CN111829205A - Digital scroll heat pump unit and its control method, device and storage medium - Google Patents

Abstract

The invention discloses a digital vortex heat pump unit and a control method, a device and a storage medium thereof. The digital vortex dual-system heat pump unit consists of the digital vortex compressor and the fixed-frequency compressor, and the digital vortex compressor and the fixed-frequency compressor are provided with control logics, so that the control of the fixed-frequency compressor and the digital vortex compressor can be realized, wherein the control of the fixed-frequency compressor can realize coarse adjustment of output temperature, and the control of the digital vortex compressor can realize fine adjustment of output temperature, so that the quick fine adjustment of the output temperature is realized, and when the digital vortex heat pump unit is applied to occasions such as material drying, various drying processes are easy to realize. The invention is widely applied to the technical field of heat pumps.

Description

Digital scroll heat pump unit and its control method, device and storage medium

technical field

The invention relates to the technical field of heat pumps, in particular to a digital scroll heat pump unit and a control method, device and storage medium thereof.

Background technique

Most of the existing heat pump units use fixed-frequency compressors. Although they can output stable heat, when used in materials drying and other occasions, it is often necessary to control the temperature of materials to change in multiple stages to realize various drying processes. Existing heat pump units are difficult to achieve precise and rapid temperature control.

Terminology Explanation

Digital Scroll: A compressor that uses Axial Flex technology, which allows the scrolls in a Digital Scroll to move a very small distance in the axial direction, ensuring that the scrolls are always in optimum condition. strength to work. The two scrolls in the digital scroll compressor are closely integrated in any operating environment, ensuring the digital scroll compressor has a high energy efficiency ratio. The control cycle of the digital scroll compressor includes a load period and an unload period. During the load period, the digital scroll compressor works like a regular scroll compressor, delivering the full capacity and the compressor output is 100%; during the unloading period, due to the flexible design of the compressor, the two scrolls are in the axial direction There is a micro separation, no more refrigerant is passing through the digital scroll compressor, the digital scroll compressor output is 0.

SUMMARY OF THE INVENTION

In view of at least one of the above technical problems, the purpose of the present invention is to provide a digital scroll heat pump unit and its control method, device and storage medium.

On the one hand, an embodiment of the present invention includes a digital scroll heat pump unit, including:

Fixed frequency compressor;

digital scroll compressor;

a temperature measurement module for detecting the output temperature of the digital scroll heat pump unit;

a control module, configured to control the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor according to the interval in which the output temperature is located; the working state includes on and off, and the working duty The air ratio is the ratio of the time when the digital scroll compressor works in an unloaded state and works in a loaded state in one working cycle.

Further, controlling the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor according to the interval in which the output temperature is located, specifically includes:

According to the interval where the output temperature is located, the control parameter is determined; the interval is determined by the target temperature, the loading hysteresis of the digital scroll compressor, and the unloading hysteresis of the digital scroll compressor;

According to the control parameters, the current working state of the fixed-frequency compressor, and the current working duty ratio of the digital scroll compressor, the target working state of the fixed-frequency compressor and the digital scroll compressor are determined. the target operating duty cycle.

Further, determining the control parameters according to the interval in which the output temperature is located, specifically includes:

When the output temperature is equal to the target temperature, determining that the control parameter is 0;

When the output temperature is less than or equal to the difference between the target temperature and the loading hysteresis of the digital scroll compressor, and the control parameter of the previous working cycle is less than or equal to -1, determine that the control parameter is 1;

When the output temperature is less than or equal to the difference between the target temperature and the loading hysteresis of the digital scroll compressor, and the control parameter of the previous working cycle is greater than or equal to 0, the control parameter is determined to be 2;

When the output temperature is greater than or equal to the sum of the target temperature and the unloading hysteresis of the digital scroll compressor, and the control parameter of the previous working cycle is greater than or equal to 1, determine that the control parameter is -1;

When the output temperature is greater than or equal to the sum of the target temperature and the unloading hysteresis of the digital scroll compressor, and the control parameter of the previous working cycle is less than or equal to 0, determine that the control parameter is -2;

When the output temperature is less than the target temperature and greater than the difference between the target temperature and the loading hysteresis of the digital scroll compressor, and the control parameter of the previous working cycle is greater than or equal to -1, the control parameter is determined as 1;

When the output temperature is less than the target temperature and greater than the difference between the target temperature and the loading hysteresis of the digital scroll compressor, and the control parameter of the previous working cycle is equal to -2, the control parameter is determined to be 0;

When the output temperature is greater than the target temperature and less than the sum of the target temperature and the digital scroll compressor unloading hysteresis, and the control parameter of the previous working cycle is less than or equal to 1, the control parameter is determined to be - 1;

When the output temperature is greater than the target temperature and less than the sum of the target temperature and the digital scroll compressor unloading hysteresis, and the control parameter of the previous working cycle is equal to 2, the control parameter is determined to be 0.

Further, when the control parameter is greater than 0, the fixed-frequency compressor is determined according to the control parameter, the current working state of the fixed-frequency compressor, and the current working duty ratio of the digital scroll compressor. The target working state of the compressor and the target working duty cycle of the digital scroll compressor, including:

When the current working state is on, and the current working duty ratio is 100%, determine that the target working duty ratio is 100%;

When the current working state is on, and the current working duty cycle is less than 100%, determine that the target working duty cycle is equal to the sum of the product of the control parameter and 5% and the current working duty cycle;

When the current working state is OFF, and the current working duty cycle is less than 100%, if the control parameter is 2, the target working duty cycle is determined to be 100%; if the control parameter is 1, it is determined the target working duty cycle is equal to the sum of the current working duty cycle and 5%;

When the current working state is OFF and the current working duty cycle is equal to 100%, if the control parameter is 2, the target working state is determined to be ON; if the control parameter is 1, the target is determined Working duty cycle is 100%.

Further, when the control parameter is less than 0, the fixed-frequency compressor is determined according to the control parameter, the current working state of the fixed-frequency compressor, and the current working duty ratio of the digital scroll compressor. The target working state of the compressor and the target working duty cycle of the digital scroll compressor, including:

When the current working state is on, the current working duty cycle is 100%, and if the control parameter is -2, it is determined that the target working duty cycle is 0;

When the current working state is on, the current working duty cycle is 0, and the sum of the product of the control parameter and 5% and the current working duty cycle is less than the minimum duty cycle, it is determined that the target working status is closed;

When the current working state is on, the current working duty cycle is 0, and the sum of the product of the control parameter and 5% and the current working duty cycle is greater than or equal to the minimum duty cycle, it is determined that the The target working duty cycle is equal to the sum of the product of the control parameter and 5% and the current working duty cycle;

When the current working duty cycle is greater than the minimum duty cycle and the current working state is OFF, it is determined that the target working duty cycle is equal to the ratio of the product of the control parameter and 5% and the current working duty cycle and;

When the current working duty cycle is greater than the minimum duty cycle, and the current working state is off, if the control parameter is -2, it is determined that the target working state is off, and if the control parameter is -1, The target operating duty cycle is determined to be the minimum duty cycle.

Further, when the control parameter is equal to 0, the fixed-frequency compressor is determined according to the control parameter, the current working state of the fixed-frequency compressor, and the current working duty ratio of the digital scroll compressor. The target working state of the compressor and the target working duty cycle of the digital scroll compressor, including:

It is determined that the target operating duty cycle is equal to the current operating duty cycle.

Further, the controlling of the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor specifically includes:

When one working cycle of the digital scroll compressor ends, the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor are updated.

On the other hand, an embodiment of the present invention further includes a control method for a digital scroll heat pump unit, wherein the digital scroll heat pump unit includes a fixed frequency compressor, a digital scroll compressor, a temperature measurement module and a control module. The control method Include the following steps:

Detecting the output temperature of the digital scroll heat pump unit;

According to the interval of the output temperature, the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor are controlled; the working state includes on and off, and the working duty ratio is the The ratio of the time that the digital scroll compressor works in an unloaded state and in a loaded state in a working cycle.

On the other hand, an embodiment of the present invention further includes a computer apparatus, including a memory and a processor, where the memory is configured to store at least one program, and the processor is configured to load the at least one program to execute the method of the embodiment.

On the other hand, an embodiment of the present invention further includes a storage medium, in which processor-executable instructions are stored, and when executed by the processor, the processor-executable instructions are used to perform the method of the embodiment.

The beneficial effects of the present invention are: in the embodiment of the present invention, the digital scroll compressor and the fixed-frequency compressor are used to form a digital scroll dual-system heat pump unit, and control logic is configured for the digital scroll compressor and the fixed-frequency compressor, The control of fixed-frequency compressor and digital scroll compressor can be realized. The control of fixed-frequency compressor can realize coarse adjustment of output temperature, and the control of digital scroll compressor can realize fine-tuning of output temperature. Realize the rapid and fine adjustment of the output temperature. When the digital scroll heat pump unit is used in material drying and other occasions, it is easy to realize various drying processes.

Description of drawings

FIG. 1 is a schematic structural diagram of a digital scroll heat pump unit in an embodiment.

Detailed ways

In the embodiment of the present invention, the digital scroll heat pump unit refers to a heat pump unit with a digital scroll compressor. Referring to Figure 1, the digital scroll heat pump unit includes a fixed frequency compressor, a digital scroll compressor, a temperature measurement module and a control module, and the control module is respectively connected with the fixed frequency compressor, the digital scroll compressor and the temperature measurement module. Control the work of the fixed frequency compressor and the digital scroll compressor. The fixed frequency compressor and the digital scroll compressor form a dual compressor system.

The temperature measurement module detects the output temperature of the digital scroll heat pump unit. In actual use, you can choose to detect the temperature of the item or area heated by the digital scroll heat pump unit. Configure the temperature measurement module to detect the temperature of the oven as the output temperature of the digital scroll heat pump unit.

The temperature measurement module sends the detected output temperature of the digital scroll heat pump unit to the control module, and the control module determines the control logic for the digital scroll compressor and fixed-frequency compressor according to the output temperature, so the control module, temperature measurement module, The fixed frequency compressor and the digital scroll compressor form a negative feedback system, and the output temperature is used as a negative feedback signal.

In the embodiment of the present invention, the control module determines the control logic for the digital scroll compressor and the fixed-frequency compressor according to the output temperature, specifically:

According to the range of the output temperature, controlling the working state of the fixed-frequency compressor, that is, controlling the opening and closing of the fixed-frequency compressor, and controlling the duty ratio of the digital scroll compressor, that is, controlling the digital scroll compressor in one working cycle The proportion of time between working in the unloaded state and working in the loaded state, for example, when the duty cycle of the digital scroll compressor is 100%, the digital scroll compressor works in the unloaded state in one working cycle, that is, the solenoid valve of the digital scroll compressor. No output in one working cycle; when the working duty ratio is 90%, the digital scroll compressor works 90% of the time in the unloaded state and 10% of the time in the loaded state, that is, the digital scroll compressor The solenoid valve of the machine has no output for 90% of the time in a working cycle, and output for 10% of the time.

In the embodiment of the present invention, the control module stores temperature data such as the target temperature, the loading hysteresis of the digital scroll compressor, and the unloading hysteresis of the digital scroll compressor. The target temperature can be set when the digital scroll heat pump unit is used. The temperature indicates the temperature to which the digital scroll heat pump unit is expected to heat the item. The digital scroll compressor loading hysteresis and the digital scroll compressor unloading hysteresis are related to the performance of the digital scroll compressor. There is a relationship between the target temperature, the digital scroll compressor loading hysteresis, and the digital scroll compressor unloading hysteresis and other temperature data, which can form one or more intervals, and the control module can determine which interval the output temperature is in.

In the embodiment of the present invention, the control module controls the digital scroll compressor and the fixed-frequency compressor according to the duty cycle. In each working cycle, the control module controls the fixed-frequency compressor and the digital scroll compressor according to the working state and working duty cycle determined by the working cycle. Before the next working cycle comes, the control module determines the working state and working duty ratio of the next working cycle, that is, the target working state and the target working duty ratio. When the next working cycle comes, the control module updates the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor, so that the fixed-frequency compressor works according to the target working state, and the digital scroll compressor occupies the target working status. Empty ratio work.

In the embodiment of the present invention, when the control module wants to control the working state of the fixed-frequency compressor in an upcoming working cycle, and the working duty ratio of the digital scroll compressor in an upcoming working cycle, the control module According to the interval of the output temperature, first determine a control parameter, then according to the size of the control parameter, and according to the working state of the fixed frequency compressor in the current working cycle, that is, the current working state, and according to the digital scroll compressor in the current working cycle The working duty ratio in , that is, the current working duty ratio, is used to determine the working state of the fixed frequency compressor in an upcoming working cycle, and the working duty ratio of the digital scroll compressor in an upcoming working cycle. .

In the embodiment of the present invention, the control parameter is represented by the symbol KI, and the value of KI may be -2, -1, 0, 1 and 2. The control module determines multiple intervals according to the target temperature, the loading hysteresis of the digital scroll compressor and the unloading hysteresis of the digital scroll compressor. Determining the interval where the output temperature is located is equivalent to determining the output temperature and the target temperature and the loading hysteresis of the digital scroll compressor. The size relationship between the digital scroll compressor unloading hysteresis and other temperature data. The control module determines the rules of KI according to the size relationship between the output temperature and the target temperature, the digital scroll compressor loading hysteresis and the digital scroll compressor unloading hysteresis and other temperature data as shown in Table 1.

Table 1

The principle of the rules in Table 1 is: According to the relationship between the output temperature and the target temperature, the loading hysteresis of the digital scroll compressor and the unloading hysteresis of the digital scroll compressor, etc., the change trend of the output temperature can be determined to control the parameters. value to represent the trend of change. In the embodiment of the present invention, KI<0 indicates that the output temperature is on an upward trend, KI>0 indicates that the output temperature is on a downward trend, and KI=0 indicates that the output temperature is unchanged.

The control module can confirm the value of the control parameter according to the rules in Table 1. According to the value of the control parameter, the change trend of the output temperature of the digital scroll heat pump unit can be determined. Combined with the current working state of the fixed-frequency compressor and the current working duty ratio of the digital scroll compressor, the control module can determine the fixed-frequency compressor. The target working state of the compressor and the target working duty cycle of the digital scroll compressor, so as to meet or resist the change trend of the output temperature and realize the adjustment of the output temperature. The control module determines the target working state of the fixed-frequency compressor and the target working duty ratio of the digital scroll compressor according to the value of the control parameter, the current working state of the fixed-frequency compressor and the current working duty ratio of the digital scroll compressor The specific rules are shown in Table 2.

Table 2

In the embodiment of the present invention, a digital scroll compressor and a fixed-frequency compressor are used to form a digital scroll dual-system heat pump unit, and the control logic in Table 1 and Table 2 are configured for the digital scroll compressor and the fixed-frequency compressor. Execute the control logic in Table 1, determine a control parameter according to the interval of the output temperature, and then execute the control logic in Table 2, according to the size of the control parameter, and according to the working state of the fixed-frequency compressor in the current working cycle, that is, the current Working state, and according to the working duty ratio of the digital scroll compressor in the current working cycle, that is, the current working duty cycle, to determine the working state of the fixed frequency compressor in an upcoming working cycle, and the digital scroll compressor. The duty cycle of the compressor in an upcoming duty cycle. Through the combination of the control logic in Table 1 and the control logic in Table 2, the control of the fixed-frequency compressor and the digital scroll compressor can be realized, and the control of the fixed-frequency compressor can realize the coarse adjustment of the output temperature, The control of the digital scroll compressor can realize the fine-tuning of the output temperature, so as to realize the rapid and fine adjustment of the output temperature. When the digital scroll heat pump unit is used in material drying and other occasions, it is easy to realize various drying processes. .

In the embodiment of the present invention, a computer program suitable for the control module in the digital scroll heat pump unit can be written through computer programming technology. When the computer program is read and run by the control module, the control module can realize the table 1 of the above-mentioned embodiment. and the control logic in Table 2 to control the fixed-frequency compressor and the digital scroll compressor to achieve the technical effects of the above embodiments.

In an embodiment of the present invention, a computer device includes a memory and a processor, where the memory is configured to store at least one program, and the processor is configured to load the at least one program to execute the control method in the embodiment, to achieve the same The same technical effect as described in the examples.

In an embodiment of the present invention, a storage medium stores processor-executable instructions, and when executed by the processor, the processor-executable instructions are used to execute the control method in the embodiment, and the implementation is the same as the embodiment The same technical effect as described.

It should be noted that, unless otherwise specified, when a feature is called "fixed" or "connected" to another feature, it can be directly fixed or connected to another feature, or it can be indirectly fixed or connected to another feature. on a feature. In addition, descriptions such as upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of each component of the present disclosure in the accompanying drawings. As used in this disclosure, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. Also, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by those skilled in the art. The terms used in the description of the embodiments are only used to describe specific embodiments, rather than to limit the present invention. As used in this example, the term "and/or" includes any combination of one or more of the associated listed items.

It will be understood that, although the terms first, second, third, etc. may be used in this disclosure to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish elements of the same type from one another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples or exemplary language ("for example," "such as," etc.) provided in this embodiment is intended only to better illustrate embodiments of the invention and does not detract from the scope of the invention unless otherwise requested impose restrictions.

It should be appreciated that embodiments of the present invention may be implemented or implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in non-transitory computer readable memory. The method can be implemented in a computer program using standard programming techniques - including a non-transitory computer-readable storage medium configured with a computer program, wherein the storage medium so configured causes the computer to operate in a specific and predefined manner - according to the specific Methods and figures described in the Examples. Each program may be implemented in a high-level procedural or object-oriented programming language to communicate with a computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.

Furthermore, the operations of the processes described in this embodiment may be performed in any suitable order unless otherwise indicated by this embodiment or otherwise clearly contradicted by context. The processes described in this embodiment (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be executed as code collectively executing on one or more processors (eg, executable instructions, one or more computer programs, or one or more applications), implemented in hardware, or a combination thereof. The computer program includes a plurality of instructions executable by one or more processors.

Further, the methods may be implemented in any type of computing platform operably connected to a suitable, including but not limited to personal computer, minicomputer, mainframe, workstation, network or distributed computing environment, stand-alone or integrated computer platform, or communicate with charged particle tools or other imaging devices, etc. Aspects of the invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optically read and/or written storage medium, RAM, ROM, etc., such that it can be read by a programmable computer, when a storage medium or device is read by a computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, may be transmitted over wired or wireless networks. The invention described in this embodiment includes these and other various types of non-transitory computer-readable storage media when such media includes instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein.

A computer program can be applied to input data to perform the functions described in this embodiment to transform the input data to generate output data for storage to non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects produced on the display.

The above are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments, as long as it achieves the technical effect of the present invention by the same means, all within the spirit and principle of the present invention, do Any modification, equivalent replacement, improvement, etc., should be included within the protection scope of the present invention. Various modifications and changes can be made to its technical solutions and/or implementations within the protection scope of the present invention.

Claims (10)

1. A digital vortex heat pump unit, its characterized in that includes:

a fixed-frequency compressor;

a digital scroll compressor;

the temperature measuring module is used for detecting the output temperature of the digital vortex heat pump unit;

the control module is used for controlling the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor according to the interval of the output temperature; the working state comprises opening and closing, and the working duty ratio is the time proportion of the digital scroll compressor working in an unloading state and working in a loading state in one working period.

2. The digital vortex heat pump unit according to claim 1, wherein the controlling the operating state of the fixed frequency compressor and the operating duty cycle of the digital vortex compressor according to the section of the output temperature specifically comprises:

determining control parameters according to the interval of the output temperature; the interval is determined by target temperature, loading return difference of the digital scroll compressor and unloading return difference of the digital scroll compressor;

and determining the target working state of the fixed-frequency compressor and the target working duty ratio of the digital scroll compressor according to the control parameters, the current working state of the fixed-frequency compressor and the current working duty ratio of the digital scroll compressor.

3. The digital vortex heat pump unit according to claim 2, wherein the determining of the control parameters according to the interval of the output temperature specifically comprises:

when the output temperature is equal to the target temperature, determining that the control parameter is 0;

when the output temperature is less than or equal to the difference between the target temperature and the loading return difference of the digital scroll compressor and the control parameter of the previous work period is less than or equal to-1, determining that the control parameter is 1;

when the output temperature is less than or equal to the difference between the target temperature and the loading return difference of the digital scroll compressor and the control parameter of the previous working period is greater than or equal to 0, determining that the control parameter is 2;

when the output temperature is greater than or equal to the sum of the target temperature and the unloading return difference of the digital scroll compressor, and the control parameter of the previous working period is greater than or equal to 1, determining that the control parameter is-1;

when the output temperature is greater than or equal to the sum of the target temperature and the unloading return difference of the digital scroll compressor, and the control parameter of the previous working period is less than or equal to 0, determining that the control parameter is-2;

when the output temperature is less than the target temperature and greater than the difference between the target temperature and the loading return difference of the digital scroll compressor, and the control parameter of the previous working period is greater than or equal to-1, determining that the control parameter is 1;

when the output temperature is less than the target temperature and greater than the difference between the target temperature and the loading return difference of the digital scroll compressor, and the control parameter of the previous working period is equal to-2, determining that the control parameter is 0;

when the output temperature is greater than the target temperature and less than the sum of the target temperature and the unloading return difference of the digital scroll compressor, and the control parameter of the previous working period is less than or equal to 1, determining that the control parameter is-1;

and when the output temperature is greater than the target temperature and less than the sum of the target temperature and the unloading return difference of the digital scroll compressor, and the control parameter of the previous working period is equal to 2, determining that the control parameter is 0.

4. The digital vortex heat pump unit according to claim 3, wherein when the control parameter is greater than 0, the determining the target operating state of the fixed-frequency compressor and the target operating duty cycle of the digital vortex compressor according to the control parameter, the current operating state of the fixed-frequency compressor and the current operating duty cycle of the digital vortex compressor specifically comprises:

when the current working state is on and the current working duty ratio is 100%, determining that the target working duty ratio is 100%;

when the current working state is on and the current working duty ratio is less than 100%, determining that the target working duty ratio is equal to the sum of the product of the control parameter and 5% and the current working duty ratio;

when the current working state is off and the current working duty ratio is less than 100%, if the control parameter is 2, determining that the target working duty ratio is 100%, and if the control parameter is 1, determining that the target working duty ratio is equal to the sum of the current working duty ratio and 5%;

and when the current working state is closed and the current working duty ratio is equal to 100%, if the control parameter is 2, determining that the target working state is open, and if the control parameter is 1, determining that the target working duty ratio is 100%.

5. The digital vortex heat pump unit according to claim 3, wherein when the control parameter is less than 0, the determining the target operating state of the fixed frequency compressor and the target operating duty cycle of the digital vortex compressor according to the control parameter, the current operating state of the fixed frequency compressor and the current operating duty cycle of the digital vortex compressor specifically comprises:

when the current working state is on, the current working duty ratio is 100%, and if the control parameter is-2, the target working duty ratio is determined to be 0;

when the current working state is on, the current working duty ratio is 0, and the sum of the product of the control parameter and 5% and the current working duty ratio is less than the minimum duty ratio, determining that the target working state is off;

when the current working state is on, the current working duty ratio is 0, and the sum of the product of the control parameter and 5% and the current working duty ratio is greater than or equal to the minimum duty ratio, determining that the target working duty ratio is equal to the sum of the product of the control parameter and 5% and the current working duty ratio;

when the current working duty ratio is larger than the minimum duty ratio and the current working state is closed, determining that the target working duty ratio is equal to the sum of the product of the control parameter and 5% and the current working duty ratio;

and when the current working duty ratio is larger than the minimum duty ratio and the current working state is closed, if the control parameter is-2, determining that the target working state is closed, and if the control parameter is-1, determining that the target working duty ratio is the minimum duty ratio.

6. The digital scroll heat pump unit according to any one of claims 3 to 5, wherein when the control parameter is equal to 0, the determining the target operating state of the fixed-frequency compressor and the target operating duty cycle of the digital scroll compressor according to the control parameter, the current operating state of the fixed-frequency compressor and the current operating duty cycle of the digital scroll compressor specifically comprises:

determining that the target operating duty cycle is equal to the current operating duty cycle.

7. The digital vortex heat pump unit according to any one of claims 3 to 5, wherein the controlling of the operating state of the fixed frequency compressor and the operating duty cycle of the digital vortex compressor specifically comprises:

and when one working period of the digital scroll compressor is finished, updating the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor.

8. The control method of the digital vortex heat pump unit is characterized in that the digital vortex heat pump unit comprises a fixed-frequency compressor, a digital vortex compressor, a temperature measurement module and a control module, and the control method comprises the following steps:

detecting the output temperature of the digital vortex heat pump unit;

controlling the working state of the fixed-frequency compressor and the working duty ratio of the digital scroll compressor according to the interval of the output temperature; the working state comprises opening and closing, and the working duty ratio is the time proportion of the digital scroll compressor working in an unloading state and working in a loading state in one working period.

9. A computer apparatus comprising a memory for storing at least one program and a processor for loading the at least one program to perform the method of claim 8.

10. A storage medium having stored therein processor-executable instructions, which when executed by a processor, are configured to perform the method of claim 8.

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