CN-117006590-B - Control method and device of variable frequency air conditioner, variable frequency air conditioner and storage medium

CN117006590BCN 117006590 BCN117006590 BCN 117006590BCN-117006590-B

Abstract

The invention discloses a control method, a device and a storage medium of a variable frequency air conditioner, wherein the method comprises the steps of executing a first preset control logic by combining a phase current value of a compressor, a frequency of the compressor, an outdoor environment temperature of the variable frequency air conditioner and an outdoor heat exchanger tube temperature of the variable frequency air conditioner based on an upper limit frequency control parameter of the compressor in a current operation mode under the condition that the first accumulated operation time of the compressor is larger than or equal to a first preset operation time, and executing a second preset control logic by combining the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable frequency air conditioner based on the upper limit frequency control parameter of the compressor in the current operation mode under the condition that the first accumulated operation time of the compressor is smaller than the first preset operation time. According to the scheme, the frequency of the compressor is subjected to frequency reduction control in advance when the running condition of the variable-frequency air conditioner is abnormal, so that the running reliability and the heat exchange capacity are ensured.

Inventors

LAI XIAOCHENG
XIONG SHUO
WU ZHAOLIANG
LU JIANWEI
Meng Kehan
WEI YUANHANG

Assignees

珠海格力电器股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230814

Claims (10)

1. The control method of the variable frequency air conditioner is characterized by comprising the following steps of: After the compressor of the variable frequency air conditioner is started, timing the running time of the variable frequency air conditioner after the compressor is started to obtain a first accumulated running time of the compressor; Determining the upper limit frequency control parameter of a compressor of the variable frequency air conditioner in the current operation mode of the variable frequency air conditioner, and recording the upper limit frequency control parameter of the compressor in the current operation mode; acquiring a phase current value of the compressor, acquiring the frequency of the compressor, acquiring the outdoor environment temperature of the variable-frequency air conditioner, and acquiring the pipe temperature of an outdoor heat exchanger of the variable-frequency air conditioner; Under the condition that the first accumulated running time of the compressor is larger than or equal to a first preset running time, based on an upper limit frequency control parameter of the compressor in the current running mode, combining a phase current value of the compressor, the frequency of the compressor, the outdoor environment temperature of the variable-frequency air conditioner and the outdoor heat exchanger tube temperature of the variable-frequency air conditioner, executing first preset control logic or second preset control logic of a frequency-reducing protection mode of the phase current value of the compressor so as to realize frequency-reducing protection of the phase current value of the compressor, wherein the first preset control logic is used for reducing the frequency-limiting current value and the frequency-reducing current value of the preset phase current value in advance when the running condition of the variable-frequency air conditioner does not belong to a preset normal condition, and controlling the frequency of the compressor according to the frequency-limiting current value and the frequency-reducing current value of the reduced phase current value; And under the condition that the first accumulated running time of the compressor is smaller than the first preset running time, based on the upper limit frequency control parameter of the compressor in the current running mode, executing second preset control logic of a frequency-reducing protection mode of the phase current value of the compressor in combination with the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable-frequency air conditioner so as to realize frequency-reducing protection of the phase current value of the compressor.
2. The control method of a variable frequency air conditioner according to claim 1, wherein based on an upper limit frequency control parameter of the compressor in the current operation mode, in combination with a phase current value of the compressor, a frequency of the compressor, an outdoor ambient temperature of the variable frequency air conditioner, and an outdoor heat exchanger tube temperature of the variable frequency air conditioner, a first preset control logic or a second preset control logic of a down-conversion protection mode of the phase current value of the compressor is performed to realize down-conversion protection of the phase current value of the compressor, comprising: Determining the change rate of the tube temperature of the outdoor heat exchanger of the variable-frequency air conditioner within a continuous set time length, and determining whether the change rate of the tube temperature of the outdoor heat exchanger of the variable-frequency air conditioner is larger than or equal to the set tube temperature change rate; If it is determined that the change rate of the outdoor heat exchanger tube temperature of the variable-frequency air conditioner is greater than or equal to the set tube temperature change rate, executing a first preset control logic of a frequency-reducing protection mode of the phase current value of the compressor on the basis of the upper limit frequency control parameter of the compressor in the current operation mode and in combination with the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable-frequency air conditioner so as to realize frequency-reducing protection of the phase current value of the compressor; and if the change rate of the tube temperature of the outdoor heat exchanger of the variable-frequency air conditioner is smaller than the set tube temperature change rate, executing second preset control logic of a frequency-reducing protection mode of the phase current value of the compressor on the basis of the upper limit frequency control parameter of the compressor in the current operation mode and combining the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable-frequency air conditioner so as to realize frequency-reducing protection of the phase current value of the compressor.
3. The method according to claim 2, wherein the upper limit frequency control parameter of the compressor in the current operation mode includes a frequency limit current value of the compressor in the current operation mode, a frequency reduction current value of the compressor in the current operation mode, a first frequency limit current value corresponding to an outdoor environment temperature of the inverter air conditioner in the current operation mode, a second frequency limit current value corresponding to an outdoor environment temperature of the inverter air conditioner in the current operation mode, and an upper limit frequency of the compressor in the current operation mode; Based on the upper limit frequency control parameter of the compressor in the current operation mode, in combination with the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable frequency air conditioner, executing first preset control logic of a frequency-reducing protection mode of the phase current value of the compressor so as to realize frequency-reducing protection of the phase current value of the compressor, wherein the first preset control logic comprises the following steps: Reducing the frequency limiting current value of the compressor in the current running mode by a set current value, and reducing the frequency limiting current value of the compressor in the current running mode by the set current value; Determining whether a phase current value of the compressor is greater than or equal to a difference between the first frequency limiting current value and the set current value; If the phase current value of the compressor is determined to be greater than or equal to the difference between the first frequency-limiting current value and the set current value, frequency-reducing processing is carried out on the frequency of the compressor until the phase current value of the compressor is reduced to a frequency-reducing protection mode of exiting the phase current value of the compressor; If it is determined that the phase current value of the compressor is less than the difference between the first frequency limiting current value and the set current value, then: when the phase current value of the compressor is greater than or equal to the difference between the second frequency limiting current value and the set current value, the frequency of the compressor is kept at the current frequency, and the frequency of the compressor is not allowed to rise; In the case where the phase current value of the compressor is smaller than the difference between the second frequency-limiting current value and the set current value, the frequency of the compressor is set to a preset target frequency, and the frequency of the compressor is allowed to rise.
4. The control method of a variable frequency air conditioner according to claim 3, wherein a first preset control logic of a down-conversion protection mode of a phase current value of the compressor is executed based on an upper limit frequency control parameter of the compressor in the current operation mode in combination with the phase current value of the compressor, a frequency of the compressor, and an outdoor ambient temperature of the variable frequency air conditioner to realize down-conversion protection of the phase current value of the compressor, further comprising: the method comprises the steps of setting a frequency value of the upper limit frequency of the compressor in a current running mode, and counting the running time of the compressor again to obtain a second accumulated running time of the compressor; Determining whether a second accumulated operation time of the compressor is greater than or equal to a second preset operation time or a change rate of an outdoor ambient temperature of the air conditioner is greater than or equal to a set temperature change rate; if yes, exiting the frequency-reducing protection mode of the phase current value of the compressor, and stopping correcting the upper limit frequency of the compressor in the current running mode; Otherwise, returning to execute the first preset control logic or the second preset control logic of the frequency-reducing protection mode of the phase current value of the compressor by combining the phase current value of the compressor, the frequency of the compressor, the outdoor environment temperature of the variable-frequency air conditioner and the outdoor heat exchanger tube temperature of the variable-frequency air conditioner again based on the upper limit frequency control parameter of the compressor in the current operation mode so as to realize the frequency-reducing protection of the phase current value of the compressor.
5. The method according to any one of claims 1 to 4, wherein the upper limit frequency control parameter of the compressor in the current operation mode includes a frequency limit current value of the compressor in the current operation mode, a first frequency limit current value corresponding to an outdoor environment temperature of the inverter air conditioner in the current operation mode, a second frequency limit current value corresponding to an outdoor environment temperature of the inverter air conditioner in the current operation mode, and an upper limit frequency of the compressor in the current operation mode; Based on the upper limit frequency control parameter of the compressor in the current operation mode, in combination with the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable frequency air conditioner, executing second preset control logic of a frequency-reducing protection mode of the phase current value of the compressor so as to realize frequency-reducing protection of the phase current value of the compressor, wherein the second preset control logic comprises the following steps: determining whether a phase current value of the compressor is greater than or equal to the first frequency limiting current value; If the phase current value of the compressor is determined to be greater than or equal to the first frequency limiting current value, frequency reduction processing is carried out on the frequency of the compressor until the phase current value of the compressor is reduced to a frequency reduction protection mode of exiting the phase current value of the compressor; if it is determined that the phase current value of the compressor is less than the first frequency limiting current value, then: In the case where the phase current value of the compressor is greater than or equal to the second frequency limiting current value, maintaining the frequency of the compressor at a current frequency and not allowing the frequency of the compressor to rise; in the case where the phase current value of the compressor is smaller than the second frequency limiting current value, the frequency of the compressor is set to a preset target frequency, and the frequency of the compressor is allowed to rise.
6. The control method of a variable frequency air conditioner according to claim 5, wherein a second preset control logic of a down-conversion protection mode of a phase current value of the compressor is executed based on an upper limit frequency control parameter of the compressor in the current operation mode in combination with the phase current value of the compressor, a frequency of the compressor, and an outdoor ambient temperature of the variable frequency air conditioner to realize down-conversion protection of the phase current value of the compressor, further comprising: the method comprises the steps of setting a frequency value of the upper limit frequency of the compressor in a current running mode, and counting the running time of the compressor again to obtain a second accumulated running time of the compressor; Determining whether a second accumulated operation time of the compressor is greater than or equal to a second preset operation time or a change rate of an outdoor ambient temperature of the air conditioner is greater than or equal to a set temperature change rate; if yes, exiting the frequency-reducing protection mode of the phase current value of the compressor, and stopping correcting the upper limit frequency of the compressor in the current running mode; otherwise, returning to execute the second preset control logic of the frequency-reducing protection mode of the phase current value of the compressor by combining the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable-frequency air conditioner again based on the upper limit frequency control parameter of the compressor in the current operation mode so as to realize the frequency-reducing protection of the phase current value of the compressor.
7. A control device of a variable frequency air conditioner, comprising: The control unit is configured to time the running time of the variable frequency air conditioner after the compressor of the variable frequency air conditioner is started, so as to obtain a first accumulated running time of the compressor; the control unit is further configured to determine a current operation mode of the variable frequency air conditioner, determine an upper limit frequency control parameter of a compressor of the variable frequency air conditioner in the current operation mode of the variable frequency air conditioner, and record the upper limit frequency control parameter of the compressor in the current operation mode; an acquisition unit configured to acquire a phase current value of the compressor, acquire a frequency of the compressor, acquire an outdoor environment temperature of the variable frequency air conditioner, and acquire an outdoor heat exchanger tube temperature of the variable frequency air conditioner; The control unit is further configured to execute a first preset control logic or a second preset control logic of a frequency-reducing protection mode of the phase current value of the compressor according to the phase current value and the frequency-reducing current value after the reduction, so as to realize frequency-reducing protection of the phase current value of the compressor when the operation condition of the variable frequency air conditioner does not belong to a preset normal condition, wherein the first preset control logic is used for reducing the frequency-limiting current value and the frequency-reducing current value of the preset phase current value in advance to control the frequency of the compressor according to the frequency-limiting current value and the frequency-reducing current value of the phase current value after the reduction when the operation condition of the variable frequency air conditioner does not belong to the preset normal condition; the control unit is further configured to execute, in combination with the phase current value of the compressor, the frequency of the compressor, and the outdoor ambient temperature of the inverter air conditioner, second preset control logic of a frequency-down protection mode of the phase current value of the compressor based on an upper limit frequency control parameter of the compressor in the current operation mode, so as to realize frequency-down protection of the phase current value of the compressor, when the first accumulated operation time of the compressor is smaller than the first preset operation time.
8. The control device of a variable frequency air conditioner according to claim 7, wherein the control unit performs a first preset control logic or a second preset control logic of a down-conversion protection mode of a phase current value of the compressor based on an upper limit frequency control parameter of the compressor in the current operation mode in combination with the phase current value of the compressor, a frequency of the compressor, an outdoor environment temperature of the variable frequency air conditioner, and an outdoor heat exchanger tube temperature of the variable frequency air conditioner to realize down-conversion protection of the phase current value of the compressor, comprising: Determining the change rate of the tube temperature of the outdoor heat exchanger of the variable-frequency air conditioner within a continuous set time length, and determining whether the change rate of the tube temperature of the outdoor heat exchanger of the variable-frequency air conditioner is larger than or equal to the set tube temperature change rate; If it is determined that the change rate of the outdoor heat exchanger tube temperature of the variable-frequency air conditioner is greater than or equal to the set tube temperature change rate, executing a first preset control logic of a frequency-reducing protection mode of the phase current value of the compressor on the basis of the upper limit frequency control parameter of the compressor in the current operation mode and in combination with the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable-frequency air conditioner so as to realize frequency-reducing protection of the phase current value of the compressor; and if the change rate of the tube temperature of the outdoor heat exchanger of the variable-frequency air conditioner is smaller than the set tube temperature change rate, executing second preset control logic of a frequency-reducing protection mode of the phase current value of the compressor on the basis of the upper limit frequency control parameter of the compressor in the current operation mode and combining the phase current value of the compressor, the frequency of the compressor and the outdoor environment temperature of the variable-frequency air conditioner so as to realize frequency-reducing protection of the phase current value of the compressor.
9. A variable frequency air conditioner according to any one of claims 7 to 8, characterized by comprising a control device of the variable frequency air conditioner.
10. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to perform the control method of the variable frequency air conditioner of any one of claims 1 to 6.

Description

Control method and device of variable frequency air conditioner, variable frequency air conditioner and storage medium Technical Field The invention belongs to the technical field of variable frequency air conditioners, and particularly relates to a control method and device of a variable frequency air conditioner, a variable frequency air conditioner and a storage medium, in particular to a method and device for controlling the upper frequency limit of the variable frequency air conditioner, and the variable frequency air conditioner and the storage medium. Background In order to ensure the reliability of the components of the main board, the frequency conversion product (such as a frequency conversion air conditioner) can set a frequency reduction protection value of a phase current value of a motor in the compressor on a program. When the system pressure of the variable frequency air conditioner is high, the phase current value of the motor in the compressor becomes large, the temperature rise of the main board components becomes high, and the risk of reliability reduction of the main board components exists. Therefore, the program needs to design a frequency-reducing protection value of the phase current value so as to control the compressor of the variable-frequency air conditioner to perform frequency-reducing treatment when the system pressure of the variable-frequency air conditioner is high, thereby reducing the phase current value of the motor in the compressor and the temperature rise of the main board components. In the use process of the variable frequency air conditioner, the condition that the system pressure of the variable frequency air conditioner is changed rapidly exists, at the moment, the rising speed of the phase current value of the motor in the compressor is too high, when the frequency-reducing protection of the phase current value is triggered, the overshoot phenomenon can be caused by untimely pressure reaction in the frequency-reducing process of the compressor, so that the frequency-reducing protection value of the phase current value of the motor in the compressor is set to be lower in consideration of the special condition when the frequency-reducing protection value of the phase current value of the motor in the compressor is set. The lower frequency-reducing protection value of the phase current value of the motor in the compressor can cause non-abnormal conditions (namely, the phase current value of the motor in the compressor is in a normal condition), and is limited by the frequency-reducing protection value of the phase current value of the motor in the compressor, so that the frequency of the compressor can not be increased any more, and the heat exchange capacity of the variable-frequency air conditioner is limited. The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art. Disclosure of Invention The invention aims to provide a control method, a device and a variable frequency air conditioner and a storage medium of the variable frequency air conditioner, which are used for solving the problems that the rising speed of a phase current value of a motor in the compressor is too high under the condition that the system pressure of the variable frequency air conditioner is changed rapidly, and the overshoot phenomenon is caused by untimely pressure reaction in the process of reducing the frequency of the compressor when the frequency reduction protection value of the phase current value of the motor in the compressor is set, and the setting of the frequency reduction protection value of the phase current value of the motor in the compressor is reduced, so that the non-abnormal condition (namely that the phase current value of the motor in the compressor is in a normal condition) is caused, the frequency of the compressor cannot rise any more, and the heat exchange capacity of the variable frequency air conditioner is limited. The invention provides a control method of a variable frequency air conditioner, which comprises the steps of timing the operation time of the variable frequency air conditioner after the compressor is started to obtain a first accumulated operation time of the compressor, determining the current operation mode of the variable frequency air conditioner, determining the upper limit frequency control parameter of the compressor of the variable frequency air conditioner in the current operation mode of the variable frequency air conditioner, recording the upper limit frequency control parameter of the compressor in the current operation mode, obtaining the phase current value of the compressor in a heating mode or a refrigerating mode, obtaining the frequency of the compressor, obtaining the outdoor environment temperature of the variable frequency air conditioner, and realizing the control of the compre