CN107676939B - Control method, control system and control device of fixed-frequency air conditioner - Google Patents

Control method, control system and control device of fixed-frequency air conditioner Download PDF

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Publication number
CN107676939B
CN107676939B CN201711024600.1A CN201711024600A CN107676939B CN 107676939 B CN107676939 B CN 107676939B CN 201711024600 A CN201711024600 A CN 201711024600A CN 107676939 B CN107676939 B CN 107676939B
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temperature
preset temperature
difference
preset
expansion valve
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CN107676939A (en
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郑润兴
周国宇
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Guangdong Chigo Heating and Ventilation Equipment Co Ltd
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Guangdong Chigo Heating and Ventilation Equipment Co Ltd
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Abstract

The invention discloses a control method of a fixed-frequency air conditioner, which comprises the steps of starting a refrigeration function and setting a target temperature; acquiring room temperature and indoor unit air outlet temperature; acquiring a first difference value between the room temperature and the target temperature and comparing the first difference value with a first preset temperature; if the first difference is smaller than the first preset temperature, acquiring a second difference between the room temperature and the air outlet temperature of the indoor unit and comparing the second difference with the second preset temperature; if the second difference is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve is increased; and if the second difference value is smaller than the second preset temperature, keeping the opening degree of the electronic expansion valve unchanged. According to the judgment result, the opening degree of the electronic expansion valve is increased, the pressure difference of high pressure and low pressure is reduced, the load of the compressor is reduced, the capacity output of the fixed-frequency air conditioner is reduced, the frequency of frequent start and stop of the fixed-frequency air conditioner after the fixed-frequency air conditioner reaches the set temperature is reduced, the temperature fluctuation is reduced, and the comfort is improved. The invention also discloses a control system and a control device applying the control method.

Description

Control method, control system and control device of fixed-frequency air conditioner
Technical Field
The invention relates to the field of air conditioners, in particular to a control method of a fixed-frequency air conditioner. In addition, the invention also relates to a control system and a control device of the fixed-frequency air conditioner.
Background
The compressor is used as the most important component of the air conditioning system and is divided into a fixed frequency air conditioner and an inverter air conditioner according to whether the compressor can realize inverter operation. The fixed-frequency air conditioner has only one fixed operating frequency, so that the energy output cannot be adjusted according to the change of the load in a room, and when the temperature of the room reaches a set value, the fixed-frequency air conditioner can be started and stopped frequently, so that the room can fluctuate by 2-3 ℃, and the use comfort of the air conditioner is greatly reduced. That is, the fixed-frequency air conditioner has only one fixed operating frequency, and cannot adjust the output of the air conditioning capacity according to the change of the load in the room.
Therefore, how to provide a constant-frequency air conditioner control method capable of controlling the output of the capacity according to the temperature change in the room is a technical problem to be solved by those skilled in the art at present.
Disclosure of Invention
The invention aims to provide a control method of a fixed-frequency air conditioner, which can control the output of the capacity according to the temperature change in a room, avoid frequent start and stop and improve the comfort. Another object of the present invention is to provide a control system and a control device for a fixed-frequency air conditioner, which can control the output of the capacity according to the temperature change in a room, avoid frequent start and stop, and improve the comfort.
In order to solve the above technical problem, the present invention provides a method for controlling a fixed-frequency air conditioner, comprising:
starting a refrigeration function and setting a target temperature;
acquiring room temperature and indoor unit air outlet temperature;
acquiring a first difference value between the room temperature and the target temperature and comparing the first difference value with a first preset temperature;
if the first difference is greater than or equal to the first preset temperature, normally operating according to initial setting;
if the first difference is smaller than the first preset temperature, acquiring a second difference between the room temperature and the air outlet temperature of the indoor unit and comparing the second difference with a second preset temperature;
if the second difference value is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve is increased, and the normal operation of the compressor is kept;
and if the second difference value is smaller than the second preset temperature, keeping the opening degree of the electronic expansion valve unchanged, and keeping the compressor to normally operate.
Preferably, if the second difference is greater than or equal to the second preset temperature, increasing the opening degree of the electronic expansion valve and maintaining the normal operation of the compressor includes:
if the second difference value is greater than or equal to the second preset temperature and less than a third preset temperature, controlling the opening degree of the electronic expansion valve to increase by a first preset step number;
and if the second difference is greater than or equal to the third preset temperature, controlling the opening degree of the electronic expansion valve to increase by a second preset step number.
Preferably, if the second difference is greater than or equal to the second preset temperature, the method for increasing the opening degree of the electronic expansion valve and maintaining the normal operation of the compressor includes the steps of:
after the first preset time, obtaining the room temperature again and comparing the first difference value with the first preset temperature;
if the first difference value is greater than or equal to the first preset temperature, the electronic expansion valve recovers the initial opening degree;
and if the first difference is smaller than the first preset temperature, the electronic expansion valve keeps the changed opening degree to continue running.
Preferably, if the first difference is smaller than the first preset temperature, the method further includes, after the electronic expansion valve keeps operating at the changed opening degree, the steps of:
comparing the first difference value with a fourth preset temperature, wherein the fourth preset temperature is less than the first preset temperature;
and if the first difference value is smaller than the fourth preset temperature, controlling the compressor to stop running.
Preferably, after the device is shut down, the electronic expansion valve is controlled to recover the initial opening degree, and the compressor is controlled to stop running.
Preferably, the first preset temperature is 2 ℃, the second preset temperature is 8 ℃, the third preset temperature is 12 ℃, the third preset temperature is 0 ℃, the first preset number of steps is 30 steps, and the second preset number of steps is 50 steps.
Preferably, if the first difference is greater than or equal to the first preset temperature, after the normal operation is performed according to an initial setting or if the second difference is less than the second preset temperature, the method keeps the opening degree of the electronic expansion valve unchanged, and further includes the following steps after the normal operation of the compressor is maintained:
and after a second preset time, acquiring the room temperature again, comparing the first difference with the first preset temperature, acquiring the air outlet temperature of the indoor unit again, comparing the second difference with the second preset temperature, and controlling the opening of the electronic expansion valve according to the comparison result.
The invention provides a control system of a fixed-frequency air conditioner, which comprises:
an input unit for inputting a target temperature;
the temperature acquisition unit is used for acquiring the room temperature and the air outlet temperature of the indoor unit;
the control unit is used for acquiring a first difference value between the room temperature and the target temperature and comparing the first difference value with a first preset temperature; if the first difference is greater than or equal to the first preset temperature, normally operating according to initial setting; if the first difference is smaller than the first preset temperature, acquiring a second difference between the room temperature and the air outlet temperature of the indoor unit and comparing the second difference with a second preset temperature; if the second difference value is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve is increased, and the normal operation of the compressor is kept; and if the second difference value is smaller than the second preset temperature, keeping the opening degree of the electronic expansion valve unchanged, and keeping the compressor to normally operate.
The invention provides a control device of a fixed-frequency air conditioner, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the control method according to any one of the preceding claims when executing the computer program.
The invention provides a control method of a fixed-frequency air conditioner, which comprises the steps of starting a refrigeration function and setting a target temperature; acquiring room temperature and indoor unit air outlet temperature; acquiring a first difference value between the room temperature and the target temperature and comparing the first difference value with a first preset temperature; if the first difference is greater than or equal to the first preset temperature, normally operating according to the initial setting; if the first difference is smaller than the first preset temperature, acquiring a second difference between the room temperature and the air outlet temperature of the indoor unit and comparing the second difference with the second preset temperature; if the second difference value is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve is increased, and the normal operation of the compressor is kept; and if the second difference value is smaller than the second preset temperature, keeping the opening degree of the electronic expansion valve unchanged and keeping the compressor to normally operate.
In the refrigerating process, when the difference value between the room temperature and the target temperature is higher than a certain value, the room temperature and the target temperature are still different, the equipment normally operates according to initial setting, efficient refrigeration is continued, when the difference value between the room temperature and the target temperature is lower than the certain value, the room temperature is close to the target temperature, the temperature range where the difference value between the room temperature and the air outlet temperature of the indoor unit is located is judged again, the opening degree of the electronic expansion valve is increased according to the judgment result, the pressure difference of high pressure and low pressure is reduced, the load of the compressor is reduced, the capacity output of the fixed-frequency air conditioner is reduced, the frequency of frequent starting and stopping of the fixed-frequency air conditioner after the fixed-frequency air conditioner reaches the set.
The invention also provides a control system and a control device applying the control method, and the control method has the technical effects, so the control device also has the same technical effects, and the detailed description is omitted.
Drawings
Fig. 1 is a flow chart of a specific embodiment of a control method of a fixed-frequency air conditioner according to the present invention;
fig. 2 is a schematic system structure diagram of a control system of a fixed-frequency air conditioner according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a control method of a fixed-frequency air conditioner, which can control the output of the capacity according to the temperature change in a room, avoid frequent start and stop and improve the comfort. The other core of the invention is to provide a control system and a control device of the fixed-frequency air conditioner, which can control the output of the capacity according to the temperature change in a room, avoid frequent start and stop and improve the comfort.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and fig. 2, fig. 1 is a block flow diagram illustrating a control method of a fixed-frequency air conditioner according to an embodiment of the present invention; fig. 2 is a schematic system structure diagram of a control system of a fixed-frequency air conditioner according to an embodiment of the present invention.
The control method of the fixed-frequency air conditioner provided by the specific embodiment of the invention comprises the following steps:
starting a refrigeration function and setting a target temperature, starting a refrigeration mode of the fixed-frequency air conditioner, and setting the target temperature to be reached, wherein the target temperature is lower than the room temperature under the general condition.
The room temperature and the air outlet temperature of the indoor unit are obtained through the temperature sensor, and the air outlet temperature of the indoor unit is lower than the room temperature.
And acquiring a first difference value between the room temperature and the target temperature, comparing the first difference value with a first preset temperature, and subtracting the target temperature from the room temperature to obtain a first difference value.
If the first difference is greater than or equal to the first preset temperature, the difference between the room temperature and the target temperature is large, the room temperature is higher than the target temperature by a value greater than or equal to the first preset temperature, the target temperature is not reached, efficient refrigeration needs to be continued, and at the moment, the equipment normally operates according to the initial setting.
If the first difference is smaller than the first preset temperature, it means that the difference between the room temperature and the target temperature is small, the two temperatures are relatively close, the value of the room temperature higher than the target temperature is smaller than the first preset temperature, and the room temperature is close to the target temperature, so that the refrigeration efficiency can be properly reduced. And at the moment, obtaining a second difference value between the room temperature and the air outlet temperature of the indoor unit, comparing the second difference value with a second preset temperature, and subtracting the air outlet temperature of the indoor unit from the room temperature to obtain a second difference value.
If the second difference is greater than or equal to the second preset temperature, it indicates that the difference between the room temperature and the outlet air temperature of the indoor unit is large, and the room temperature is higher than the outlet air temperature of the indoor unit by a value greater than or equal to the second preset temperature, so that the refrigeration efficiency needs to be properly reduced, the cooling speed is slowed down, namely, the outlet air temperature of the indoor unit is properly increased, the difference between the two temperatures is reduced, frequent start and stop caused by too fast cooling is avoided, and therefore, the functions are realized by increasing the opening degree of the electronic expansion valve and keeping the compressor normally running. The opening degree of the electronic expansion valve is increased, the pressure difference of high pressure and low pressure is reduced, the load of the compressor is reduced, the capacity output of the fixed-frequency air conditioner is reduced, the frequency of frequent starting and stopping of the fixed-frequency air conditioner after the fixed-frequency air conditioner reaches a set temperature is reduced, temperature fluctuation is reduced, and the comfort is improved.
If the second difference is smaller than the second preset temperature, the difference between the room temperature and the air outlet temperature of the indoor unit is smaller, the room temperature is higher than the air outlet temperature of the indoor unit and is smaller than the second preset temperature, and the refrigeration efficiency and the cooling speed are not required to be reduced, so that the opening degree of the electronic expansion valve is kept unchanged, and the normal operation of the compressor is kept.
In order to realize more accurate control, if the second difference is greater than or equal to the second preset temperature, the method for increasing the opening degree of the electronic expansion valve and keeping the compressor normally running comprises the following steps:
if the second difference value is greater than or equal to the second preset temperature and less than the third preset temperature, controlling the opening degree of the electronic expansion valve to increase by a first preset step number;
and if the second difference is greater than or equal to the third preset temperature, controlling the opening of the electronic expansion valve to increase by a second preset step number.
When the second difference value is greater than or equal to the third preset temperature, the difference between the room temperature and the air outlet temperature of the indoor unit is larger, the opening of the electronic expansion valve needs to be controlled to increase the second preset step number with a larger numerical value, so that the capacity output reduction amplitude of the fixed-frequency air conditioner is larger, and the temperature difference is rapidly reduced; if the second difference is greater than or equal to the second preset temperature and less than the third preset temperature, it indicates that the difference between the room temperature and the outlet air temperature of the indoor unit is not particularly large, but still has a certain difference, and the opening degree of the electronic expansion valve needs to be controlled to increase by a first preset step number with a smaller value, so that the capacity output of the constant frequency air conditioner is reduced by a smaller amplitude, and the temperature difference is relatively slowly reduced. The compressor is still kept running normally.
After the opening degree of the electronic expansion valve is increased, all temperature values can correspondingly change, and for real-time monitoring, after first preset time, room temperature is obtained again and a first difference value and first preset temperature are compared.
If the first difference is greater than or equal to the first preset temperature, the target temperature is far not reached, efficient refrigeration needs to be continued, and therefore the electronic expansion valve recovers the initial opening degree.
If the first difference is smaller than the first preset temperature, the change of the opening of the electronic expansion valve is shown to have a corresponding effect, the indoor temperature is close to the target temperature, and in order to prevent frequent starting and stopping, the electronic expansion valve keeps the changed opening to continue running.
Meanwhile, if the first difference is smaller than the first preset temperature, the method further comprises the following steps after the electronic expansion valve keeps the changed opening degree to continue running:
and comparing the first difference value with a fourth preset temperature, wherein the fourth preset temperature is less than the first preset temperature and is a smaller value, if the first difference value is less than the fourth preset temperature, the room temperature is basically equal to or less than the target temperature, the refrigeration process is completed, and the compressor is controlled to stop running at the moment.
And after the equipment is stopped, the control mode is exited, the electronic expansion valve is controlled to recover the initial opening degree, and the compressor is controlled to stop running.
Specifically, the first preset temperature is 2 ℃, the second preset temperature is 8 ℃, the third preset temperature is 12 ℃, the third preset temperature is 0 ℃, the first preset number of steps is 30 steps, the second preset number of steps is 50 steps, and the numerical values of all parameters can be adjusted according to conditions, and the method is within the protection scope of the invention.
In order to realize real-time monitoring, if the first difference is greater than or equal to a first preset temperature, after the electronic expansion valve is normally operated according to an initial setting or if the second difference is less than a second preset temperature, the opening degree of the electronic expansion valve is kept unchanged, and the method further comprises the following steps after the compressor is normally operated:
and after the second preset time, acquiring the room temperature again, comparing the first difference value with the first preset temperature, acquiring the air outlet temperature of the indoor unit again, comparing the second difference value with the second preset temperature, and controlling the opening of the electronic expansion valve according to the comparison result. After the opening of the electronic control valve is controlled to be kept unchanged according to the temperature judgment result, after a certain time, the room temperature and the air outlet temperature of the indoor unit need to be obtained again, a new first difference value and a new second difference value are obtained through the target temperature, the new first difference value and the new second difference value are compared with the preset temperature again, the opening of the electronic expansion valve is controlled according to the comparison result, namely, the steps before the circulation execution are carried out, and the real-time monitoring and the circulation control are realized.
The specific implementation mode of the invention also provides a control system of the fixed-frequency air conditioner applying the control method, which comprises the following steps:
an input unit 1 for inputting a target temperature;
the temperature acquisition unit 2 is used for acquiring room temperature and indoor unit outlet air temperature;
the control unit 3 is used for acquiring a first difference value between the room temperature and the target temperature and comparing the first difference value with a first preset temperature; if the first difference is greater than or equal to the first preset temperature, normally operating according to the initial setting; if the first difference is smaller than the first preset temperature, acquiring a second difference between the room temperature and the air outlet temperature of the indoor unit and comparing the second difference with the second preset temperature; if the second difference value is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve is increased, and the normal operation of the compressor is kept; and if the second difference value is smaller than the second preset temperature, keeping the opening degree of the electronic expansion valve unchanged and keeping the compressor to normally operate.
The present invention also provides a control device for a fixed-frequency air conditioner, including:
a memory for storing a computer program;
a processor for implementing the steps of the control method as described above when executing the computer program.
The control method, the control system and the control device of the fixed-frequency air conditioner provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (5)

1. A control method of a fixed-frequency air conditioner is characterized by comprising the following steps:
starting a refrigeration function and setting a target temperature;
acquiring room temperature and indoor unit air outlet temperature;
acquiring a first difference value between the room temperature and the target temperature and comparing the first difference value with a first preset temperature;
if the first difference is greater than or equal to the first preset temperature, normally operating according to initial setting;
if the first difference is smaller than the first preset temperature, acquiring a second difference between the room temperature and the air outlet temperature of the indoor unit and comparing the second difference with a second preset temperature;
if the second difference value is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve is increased, and the normal operation of the compressor is kept;
if the second difference value is smaller than the second preset temperature, keeping the opening degree of the electronic expansion valve unchanged, and keeping the compressor to normally operate;
if the second difference is greater than or equal to the second preset temperature, increasing the opening degree of the electronic expansion valve and keeping the compressor normally running comprises the following steps:
if the second difference value is greater than or equal to the second preset temperature and less than a third preset temperature, controlling the opening degree of the electronic expansion valve to increase by a first preset step number;
if the second difference is greater than or equal to the third preset temperature, controlling the opening degree of the electronic expansion valve to increase by a second preset step number;
if the second difference is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve is increased, and the normal operation of the compressor is maintained, and then the method comprises the following steps:
after the first preset time, obtaining the room temperature again and comparing the first difference value with the first preset temperature;
if the first difference value is greater than or equal to the first preset temperature, the electronic expansion valve recovers the initial opening degree;
if the first difference value is smaller than the first preset temperature, the electronic expansion valve keeps the changed opening degree to continue to operate;
if the first difference is smaller than the first preset temperature, the method further comprises the following steps after the electronic expansion valve keeps the changed opening degree to continue running:
comparing the first difference value with a fourth preset temperature, wherein the fourth preset temperature is less than the first preset temperature;
and if the first difference value is smaller than the fourth preset temperature, controlling the compressor to stop running.
2. The control method according to claim 1, wherein after the shutdown of the apparatus, the electronic expansion valve is controlled to restore the initial opening degree and the compressor is controlled to stop operating.
3. The control method according to claim 2, wherein the first preset temperature is 2 ℃, the second preset temperature is 8 ℃, the third preset temperature is 12 ℃, the third preset temperature is 0 ℃, the first preset number of steps is 30 steps, and the second preset number of steps is 50 steps.
4. The control method according to any one of claims 1 to 3, wherein the step of maintaining the opening degree of the electronic expansion valve unchanged and maintaining the normal operation of the compressor after the normal operation is performed according to an initial setting if the first difference is greater than or equal to the first preset temperature or if the second difference is less than the second preset temperature further comprises the steps of:
and after a second preset time, acquiring the room temperature again, comparing the first difference with the first preset temperature, acquiring the air outlet temperature of the indoor unit again, comparing the second difference with the second preset temperature, and controlling the opening of the electronic expansion valve according to the comparison result.
5. A control device of a fixed-frequency air conditioner is characterized by comprising:
a memory for storing a computer program;
a processor for implementing the steps of the control method according to any one of claims 1 to 4 when executing the computer program.
CN201711024600.1A 2017-10-27 2017-10-27 Control method, control system and control device of fixed-frequency air conditioner Active CN107676939B (en)

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CN110398083A (en) * 2018-04-25 2019-11-01 杭州三花研究院有限公司 Heat management system and its control method
CN110398082A (en) * 2018-04-25 2019-11-01 杭州三花研究院有限公司 Heat management system and its control method
CN109855257B (en) * 2019-02-28 2021-09-21 宁波奥克斯电气股份有限公司 Control method and device for improving comfort of air conditioner, air conditioner and storage medium
CN110822544A (en) * 2019-11-05 2020-02-21 广东志高暖通设备股份有限公司 Fixed-frequency air conditioning system for improving indoor comfort
CN112731987A (en) * 2020-12-28 2021-04-30 江苏拓米洛环境试验设备有限公司 Temperature control method and device thereof

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