CN109236622B - Compressor frequency control method and device and air conditioner - Google Patents
Compressor frequency control method and device and air conditioner Download PDFInfo
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- CN109236622B CN109236622B CN201811110293.3A CN201811110293A CN109236622B CN 109236622 B CN109236622 B CN 109236622B CN 201811110293 A CN201811110293 A CN 201811110293A CN 109236622 B CN109236622 B CN 109236622B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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Abstract
The invention provides a compressor frequency control method and device and an air conditioner, and relates to the technical field of air conditioners. The method and the device control the frequency of the compressor based on the high pressure and the temperature of the intelligent power module by acquiring the high pressure and the temperature of the intelligent power module; the protection threshold values of the high pressure and the temperature of the intelligent power module are matched as much as possible due to the integration of the high pressure and the temperature of the intelligent power module, so that the frequency limiting or frequency reducing operation of the compressor can be avoided when the frequency of the compressor is controlled, the high pressure and the temperature of the intelligent power module are closer to the critical values, and the high-temperature refrigerating capacity of the air conditioner is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a compressor frequency control method and device and an air conditioner.
Background
The air conditioner is a widely used air conditioning equipment, the main function is to adjust the temperature and humidity of the air, and the variable frequency air conditioner has the advantages of energy saving, comfort and the like compared with the common fixed frequency air conditioner.
Generally, the national standard of high-temperature refrigerating capacity of an air conditioning system requires that the ratio of the high-temperature refrigerating capacity to the rated refrigerating capacity is greater than or equal to 85%, but the margin of the ratio is small in actual test, namely the high-temperature refrigerating capacity is small, and the main factors influencing the high-temperature refrigerating capacity are as follows: on one hand, when the air conditioner is in a refrigeration working condition, the rotating speed of the compressor is increased along with the increase of outdoor temperature, the current is increased, so that the temperature of an Intelligent Power Module (IPM Module) is increased, once the temperature of the Intelligent Power Module is higher than or equal to the frequency limit temperature of the compressor Module, the frequency increase of the compressor is forbidden, and at the moment, the high-temperature refrigeration capacity is not fully exerted; on the other hand, the air conditioner runs under the high-temperature working condition, the load of the system is increased, the evaporation temperature and the condensation temperature are correspondingly increased under the state, once the pressure of the air conditioning system reaches a protection value, the frequency reduction operation is carried out on the compressor, and the capacity of high-temperature refrigerating capacity is also limited under the condition.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for controlling a frequency of a compressor, and an air conditioner to solve the above problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, the present invention provides a compressor frequency control method, including:
acquiring high pressure and intelligent power module temperature;
controlling a compressor frequency based on the high pressure and the smart power module temperature.
Further, the step of controlling the compressor frequency based on the high pressure and the smart power module temperature comprises:
determining a first range in which the high pressure is located and a second range in which the intelligent power module temperature is located;
determining a rate of change of compressor frequency from the first range and the second range;
controlling the compressor frequency based on the rate of change.
Further, the step of determining the rate of change of the compressor frequency in accordance with the first range and the second range comprises:
determining a rate of change of the compressor frequency to be a normal rate of change when P < P1, T < T1;
determining the rate of change of the compressor frequency to be a first rate of change when P < P1, T1 ≦ T < T2;
determining the rate of change of the compressor frequency to be a second rate of change when P < P1, T2 ≦ T < T3;
when P < P1 and T is more than or equal to T3, determining the change rate of the compressor frequency to be 0;
wherein, P is a high pressure, P1 is a preset first pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
Further, the step of determining the rate of change of the compressor frequency in accordance with the first range and the second range comprises:
determining the rate of change of the compressor frequency to be a third rate of change when P1 is less than or equal to P < P2 and T < T1;
determining the rate of change of the compressor frequency to be a fourth rate of change when P1 ≦ P < P2, T1 ≦ T < T2;
determining the rate of change of the compressor frequency as a fifth rate of change when P1 ≦ P < P2, T2 ≦ T < T3;
when P1 is not less than P < P2 and T is not less than T3, determining the change rate of the compressor frequency to be 0;
wherein, P is high pressure, P1 is a preset first pressure threshold, P2 is a preset second pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
Further, the step of controlling the compressor frequency based on the high pressure and the smart power module temperature comprises:
determining the rate of change of the compressor frequency as a sixth rate of change when P2 is less than or equal to P < P3 and T < T1;
determining the rate of change of the compressor frequency to be a seventh rate of change when P2 ≦ P < P3, T1 ≦ T < T2;
determining the rate of change of the compressor frequency to be 0 when P2 ≦ P < P3, T2 ≦ T < T3;
wherein, P is a high pressure, P1 is a preset first pressure threshold, P2 is a preset second pressure threshold, P3 is a preset third pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
Further, the step of controlling the compressor frequency based on the high pressure and the smart power module temperature comprises:
when P is larger than or equal to P3 or T is larger than or equal to T3, determining the change rate of the compressor frequency to be 0; wherein P is a high pressure, P3 is a preset third pressure threshold, T is an intelligent power module temperature, and T3 is a preset third temperature threshold.
In a second aspect, the present invention provides a compressor frequency control apparatus comprising:
the parameter acquisition unit is used for acquiring high pressure and intelligent power module temperature;
a frequency control unit for controlling a compressor frequency based on the high pressure and the intelligent power module temperature.
Further, the frequency control unit is used for determining a first range where the high pressure is located and a second range where the intelligent power module temperature is located;
the frequency control unit is also used for determining the change rate of the compressor frequency according to the first range and the second range;
the frequency control unit is further configured to control the compressor frequency based on the rate of change.
Further, the frequency control unit is further configured to determine the rate of change of the compressor frequency to be a normal rate of change when P < P1, T < T1;
the frequency control unit is also used for determining the change rate of the compressor frequency as a first change rate when P < P1 and T1 is less than or equal to T < T2;
the frequency control unit is also used for determining the change rate of the compressor frequency as a second change rate when P < P1 and T2 is less than or equal to T < T3;
the frequency control unit is also used for determining the change rate of the compressor frequency to be 0 when P is less than P1 and T is more than or equal to T3;
wherein, P is a high pressure, P1 is a preset first pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
In a third aspect, the present invention provides an air conditioner comprising:
a memory;
a controller;
the temperature sensor is electrically connected with the controller and used for collecting the temperature of the intelligent power module and transmitting the temperature of the intelligent power module to the controller;
the pressure sensor is electrically connected with the controller and used for collecting high-pressure and transmitting the high-pressure to the controller; and
a compressor frequency control device mounted to the memory and including one or more software function modules executed by the controller, the compressor frequency control device comprising:
the parameter acquisition unit is used for acquiring high pressure and intelligent power module temperature;
a frequency control unit for controlling a compressor frequency based on the high pressure and the intelligent power module temperature.
Compared with the prior art, the compressor frequency control method and device provided by the invention have the following advantages:
the method comprises the steps of obtaining high pressure and intelligent power module temperature, and controlling the frequency of a compressor based on the high pressure and the intelligent power module temperature; the protection threshold values of the high pressure and the temperature of the intelligent power module are matched as much as possible due to the integration of the high pressure and the temperature of the intelligent power module, so that the frequency limiting or frequency reducing operation of the compressor can be avoided when the frequency of the compressor is controlled, the high pressure and the temperature of the intelligent power module are closer to the critical values, and the high-temperature refrigerating capacity of the air conditioner is improved.
Compared with the prior art, the air conditioner has the same advantages as the compressor frequency control method and device, and the description is omitted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a functional block diagram of an air conditioner 100 according to an embodiment of the present invention.
Fig. 2 is a flowchart of a compressor frequency control method according to an embodiment of the present invention.
Fig. 3 is a flowchart of step S202 in fig. 2.
Fig. 4 is a functional block diagram of a frequency control device of a compressor according to an embodiment of the present invention.
Icon: 1-an air conditioner; 2-a memory; 3-a controller; 4-a temperature sensor; 5-a pressure sensor; 6-a compressor; 7-compressor frequency control means; 8-a parameter acquisition unit; 9-frequency control unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 is a functional block diagram of an air conditioner 1 according to an embodiment of the present invention. The air conditioner 1 includes: memory 2, controller 3, temperature sensor 4, pressure sensor 5, compressor 6 and compressor frequency control 7. The controller 3 is electrically connected to the temperature sensor 4, the pressure sensor 5 and the compressor 6. The compressor frequency control means 7 comprises at least one memory 2 which may be stored in the form of software or firmware.
The memory 2 can be used for storing software programs and units, such as program instructions/units corresponding to the compressor frequency control device and method in the embodiment of the present invention, and the controller 3 executes various functional applications and data processing by operating the software programs and units of the compressor frequency control device 7 and method stored in the memory 2, such as the compressor frequency control method provided in the embodiment of the present invention.
The Memory 2 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.
The temperature sensor 4 is electrically connected to the controller 3, and is configured to collect a temperature of an Intelligent Power Module (IPM), and transmit the temperature of the Intelligent power module to the controller 3.
Generally, the intelligent power module is disposed in a control box of the air conditioner 1; accordingly, the temperature sensor 4 is also disposed inside the control box of the air conditioner 1 so as to collect the temperature of the intelligent power module.
The pressure sensor 5 is electrically connected with the controller 3 and used for collecting high-pressure and transmitting the high-pressure to the controller 3.
Specifically, the pressure sensor 5 is provided in a high-pressure line of the air conditioner 1.
It will be appreciated that the configuration shown in fig. 1 is merely illustrative and that the air conditioner 11 may include more or fewer components than shown in fig. 1 or may have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
First embodiment
The embodiment of the invention provides a compressor frequency control method, which is used for improving the high-temperature refrigerating capacity of an air conditioner 1. Referring to fig. 2, a flow chart of a compressor frequency control method according to an embodiment of the invention is shown. The compressor frequency control method includes:
step S201: and acquiring high pressure and intelligent power module temperature.
It will be appreciated that the high pressure and smart power module temperature are obtained by the controller 3 from the temperature sensor 4 and the pressure sensor 5, respectively.
Step S202: the compressor frequency is controlled based on the high pressure and the smart power module temperature.
Please refer to fig. 3, which is a flowchart illustrating the step S202. The step S202 includes:
substep S2021: and determining a first range in which the high-pressure is positioned and a second range in which the intelligent power module temperature is positioned.
It should be noted that, in this embodiment, a first pressure threshold, a second pressure threshold, and a third pressure threshold are preset for the high pressure, where the first pressure threshold, the second pressure threshold, and the third pressure threshold increase sequentially; thereby dividing four intervals for the high pressure.
Thus, the first range in which the high pressure is present may be: any one of P < P1, P1 < P2, P2 < P3 or P3; where P is the high pressure, P1 is the first preset pressure threshold, P2 is the second preset pressure threshold, and P3 is the third preset pressure threshold.
It should be noted that the third pressure threshold is a critical pressure of the high-pressure, and once the high-pressure exceeds the third pressure threshold and is in a state where the third pressure threshold exceeds the third pressure threshold for a long time, the high-pressure pipeline may be damaged. The first pressure threshold and the second pressure threshold are early warning values of high pressure, and when the high pressure is greater than the first pressure threshold, the high pressure is close to a third pressure threshold; and when the high pressure is greater than the second pressure threshold, it indicates that the high pressure is now very close to the third pressure threshold.
In this embodiment, a first temperature threshold, a second temperature threshold, and a third temperature threshold are preset for the temperature of the intelligent power module, wherein the first temperature threshold, the second temperature threshold, and the third temperature threshold are sequentially increased; thereby dividing four intervals for the temperature of the intelligent power module.
Thus, the second range in which the smart power module temperature is located may be: any one of T < T1, T1 < T2, T2 < T3 or T is more than or equal to T3; wherein, T is the temperature of the smart power module, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
It should be noted that the third temperature threshold is a critical temperature of the smart power module, and once the temperature of the smart power module exceeds the third temperature threshold and is in a state where the third temperature threshold exceeds the third temperature threshold for a long time, the smart power module may be damaged. The first temperature threshold and the second temperature threshold are early warning values of the temperature of the intelligent power module, and when the temperature of the intelligent power module is greater than the first temperature threshold, the temperature of the intelligent power module is close to the third temperature threshold; and when the intelligent power module temperature is greater than the second temperature threshold, the intelligent power module temperature is close to the third temperature threshold.
Substep S2022: the rate of change of the compressor frequency is determined based on the first range and the second range.
Specifically, the first: determining the rate of change of the compressor frequency to be a normal rate of change when P < P1, T < T1, i.e., when the high pressure is less than the preset first pressure threshold and the smart power module temperature is less than the preset first temperature threshold.
Because the high-pressure and the temperature of the intelligent power module do not reach the corresponding early warning values, the frequency of the compressor is not adjusted at the moment, and the frequency of the compressor can be changed normally.
And the second method comprises the following steps: and when the P is less than the P1, the T is less than or equal to T1 and less than T2, namely when the high-pressure is less than a preset first pressure threshold value and the temperature of the intelligent power module is greater than or equal to a preset first temperature threshold value and less than a preset second temperature threshold value, determining the change rate of the frequency of the compressor as a first change rate.
Compared with the first case, in the second case, on the basis that the first range of the high-pressure is unchanged, the second range of the intelligent power module is changed from T < T1 to T1 ≤ T < T2, which indicates that the temperature of the intelligent power module is relatively close to the critical temperature, but still has a rising space, and therefore, the change rate of the frequency of the compressor is determined to be the first change rate at the moment to reduce the rising speed of the frequency of the compressor, so that the high-temperature cooling capacity of the air conditioner 1 can be increased while the intelligent power module is prevented from being damaged.
And the third is that: and when the P is less than the P1, the T is less than or equal to T2 and less than T3, namely when the high-pressure is less than a preset first pressure threshold value and the temperature of the intelligent power module is greater than or equal to a preset second temperature threshold value and less than a preset third temperature threshold value, determining the change rate of the frequency of the compressor as a second change rate.
Compared with the second case, in the third case, on the basis that the first range of the high-pressure is unchanged, the second range of the intelligent power module is changed from T1 being more than or equal to T < T2 to T2 being more than or equal to T < T3, which indicates that the temperature of the intelligent power module is closer to the critical temperature than T1 being more than or equal to T < T2, but still has a rising space, so that the change rate of the compressor frequency is determined to be the second change rate, and the second change rate is smaller than the first change rate, so that the compressor frequency continues to rise but the rising speed is slower, and the high-temperature cooling capacity of the air conditioner 1 can be increased while the intelligent power module is prevented from being damaged.
And fourthly: and when P < P1 and T is more than or equal to T3, namely when the high-pressure is more than the preset first pressure threshold and the intelligent power module temperature is more than or equal to the preset first temperature threshold, determining the change rate of the compressor frequency to be 0.
Although the high-pressure does not reach the first pressure threshold value, which indicates that the high-pressure can still be increased, T ≧ T3 indicates that the intelligent power module temperature and the critical temperature are exceeded and can not be increased any more, such as damage to related devices if the intelligent power module temperature and the critical temperature are increased continuously, and therefore the change rate of the compressor frequency is determined to be 0, and the compressor frequency is prohibited from increasing continuously.
In a preferred embodiment, the rate of change of the compressor frequency can also be negative, i.e. down-converting the compressor 6, when P < P1, T ≧ T3.
And a fifth mode: and when the P1 is not less than P < P2 and T < T1, namely when the high-pressure is greater than or equal to the preset first pressure threshold and less than the preset second pressure threshold and the temperature of the intelligent power module is less than the preset first temperature threshold, determining the change rate of the compressor frequency as a third change rate.
Wherein T < T1 indicates that the temperature of the intelligent power module has not reached the first temperature threshold value, and can continue to increase normally, but P1 ≦ P < P2 indicates that the high-pressure has relatively approached the critical temperature, but still has a rising space, and therefore the change rate of the compressor frequency is determined to be the third change rate at this time, so as to reduce the rising speed of the compressor frequency, thereby increasing the high-temperature cooling capacity of the air conditioner 1.
And a sixth mode: and when the P1 is not less than P < P2, the T1 is not less than T < T2, namely when the high-pressure is greater than or equal to a preset first pressure threshold and less than a preset second pressure threshold, and the temperature of the intelligent power module is greater than or equal to a preset first temperature threshold and less than a preset second temperature threshold, determining the change rate of the frequency of the compressor as a fourth change rate.
Compared with the fifth case, in the sixth case, on the basis that the first range of the high-pressure is unchanged, the second range of the intelligent power module is changed from T < T1 to T1 ≤ T < T2, which indicates that the temperature of the intelligent power module is relatively close to the critical temperature, but still has a rising space, and therefore, the change rate of the compressor frequency is determined to be a fourth change rate, and the fourth change rate is smaller than the third change rate, so that the compressor frequency continues to rise but the rising speed is slower, and the high-temperature cooling capacity of the air conditioner 1 can be improved while the intelligent power module is prevented from being damaged.
Seventh, the method comprises: and when the P1 is not less than P < P2, the T2 is not less than T < T3, namely when the high-pressure is greater than or equal to a preset first pressure threshold and less than a preset second pressure threshold, and the temperature of the intelligent power module is greater than or equal to a preset second temperature threshold and less than a preset third temperature threshold, determining the change rate of the frequency of the compressor as a fifth change rate.
Compared with the fifth case, in the sixth case, on the basis that the first range of the high-pressure is not changed, the second range of the intelligent power module is changed from T1 being more than or equal to T < T2 to T2 being more than or equal to T < T3, which indicates that the temperature of the intelligent power module is closer to the critical temperature than T1 being more than or equal to T < T2, but still has a rising space, so that the change rate of the compressor frequency is determined to be the fifth change rate, and the fifth change rate is smaller than the fourth change rate, so that the compressor frequency continues to rise but the rising speed is slower, and the high-temperature cooling capacity of the air conditioner 1 can be increased while the intelligent power module is prevented from being damaged.
An eighth method: and when P1 is not less than P < P2, T is not less than T3, namely when the high-pressure is greater than or equal to a preset first pressure threshold and less than a preset second pressure threshold and the temperature of the intelligent power module is greater than or equal to a preset third temperature threshold, determining that the change rate of the frequency of the compressor is 0.
Compared with the fifth case, in the sixth case, on the basis that the first range of the high-pressure is unchanged, the second range of the intelligent power module is changed from T2 being more than or equal to T < T3 to T being more than or equal to T3, however, T being more than or equal to T3 indicates that the temperature of the intelligent power module is not increased any more and exceeds the critical temperature, and if the temperature is increased continuously, the related devices can be damaged, so that the change rate of the compressor frequency is determined to be 0, and the compressor frequency is prohibited from increasing continuously.
In a preferred embodiment, the rate of change of the compressor frequency can also be negative, i.e. the compressor 6 is operated down, when P1 ≦ P < P2, T ≧ T3.
Ninth, the method comprises the following steps: and when the P2 is not less than P < P3 and T < T1, namely when the high-pressure is greater than or equal to the preset second threshold value and the intelligent power module temperature is less than the preset first temperature threshold value, determining the change rate of the compressor frequency to be a sixth change rate.
In the ninth case, on the basis that the temperature of the intelligent power module in the second range is not changed, the high-pressure is changed from P1-P < P2 to P2-P < P3, which indicates that the high-pressure is closer to the critical pressure, but still has a rising space, so that the change rate of the compressor frequency is determined to be a sixth change rate, and the sixth change rate is smaller than the third change rate, so that the compressor frequency continues to rise but the rising speed is slower, thereby avoiding damaging the intelligent power module and improving the high-temperature cooling capacity of the air conditioner 1.
The tenth way: and when the P2 is not less than P < P3, the T1 is not less than T < T2, namely when the high-pressure is greater than or equal to a preset second threshold value, the temperature of the intelligent power module is greater than or equal to a preset first temperature threshold value and less than a preset second temperature threshold value, determining the change rate of the compressor frequency to be a seventh change rate.
In the tenth case, on the basis that the first range of the high-pressure is unchanged, the second range of the intelligent power module is changed from T < T1 to T1 ≤ T < T2, which indicates that the temperature of the intelligent power module is close to the critical temperature, but there is still a rise space, and therefore, the change rate of the compressor frequency is determined to be the fourth change rate, and the fourth change rate is smaller than the third change rate, so that the compressor frequency continues to rise but the rise speed is slower, and the high-temperature cooling capacity of the air conditioner 1 can be increased while the intelligent power module is prevented from being damaged.
An eleventh aspect: and when the P2 is not less than P < P3, the T2 is not less than T < T3, namely when the high-pressure is greater than or equal to a preset second threshold value, the temperature of the intelligent power module is greater than or equal to a preset second temperature threshold value and less than a preset third temperature threshold value, determining that the change rate of the compressor frequency is 0.
Since the high-pressure and the intelligent power module are both very close to respective critical values, if the frequency of the compressor is released again to continue to rise, the high-pressure pipeline, the intelligent power module or the compressor 6 can be damaged very easily, and therefore the change rate of the frequency of the compressor is determined to be 0 at this moment, and the frequency of the compressor is prohibited from continuing to rise.
In a preferred embodiment, the rate of change of the compressor frequency can also be negative, i.e. the compressor 6 is operated down, when P2 ≦ P < P3, T2 ≦ T < T3.
The twelfth way: and when P is more than or equal to P3 or T is more than or equal to T3, namely when the high-pressure is more than or equal to a preset third pressure threshold or the intelligent power module temperature is more than or equal to a preset third temperature threshold, determining the change rate of the compressor frequency to be 0.
When the high-pressure is greater than or equal to the preset third pressure threshold or the temperature of the intelligent power module is greater than or equal to the preset third temperature threshold, in order to avoid damage to the high-pressure pipeline, the intelligent power module or the compressor 6, the change rate of the frequency of the compressor is determined to be 0, and the frequency of the compressor is prohibited from continuously increasing.
Also, in a preferred embodiment: the rate of change of the compressor frequency can also be negative when P.gtoreq.P 3 or T.gtoreq.T 3, i.e. the compressor 6 is operated down.
By combining the twelve conditions, when the first range of the high-pressure is fixed, the higher the temperature of the intelligent power module is, the lower the change rate of the frequency of the compressor is; when the second range in which the temperature of the intelligent power module is located is fixed, the higher the high-pressure is, the lower the change rate of the compressor frequency is.
It can be understood that three threshold values are set for the high-pressure and the temperature of the intelligent power module respectively, the specific range of the high-pressure and the temperature of the intelligent power module is determined, and whether frequency limiting or frequency reducing operation needs to be carried out on the compressor 6 is further judged according to the determined range, so that the high-pressure and the temperature of the intelligent power module are close to the critical point of a word, the effect of the compressor 6 is exerted to the maximum extent, and the high-temperature pipeline and the intelligent power module are prevented from being damaged while the refrigerating capacity is improved.
Substep S2023: the compressor frequency is controlled based on the rate of change.
After the change rate of the frequency discharge of the compressor is determined, the frequency of the compressor is controlled to change directly based on the change rate.
Second embodiment
Referring to fig. 4, fig. 4 is a functional block diagram of a compressor frequency control device 7 according to a preferred embodiment of the present invention. It should be noted that the basic principle and the technical effects of the compressor frequency control device 7 provided in the present embodiment are the same as those of the above embodiments, and for the sake of brief description, no part of the present embodiment is mentioned, and reference may be made to the corresponding contents in the above embodiments. The compressor frequency control device 7 comprises a parameter acquisition unit 8 and a frequency control unit 9.
The parameter obtaining unit 8 is configured to obtain a high pressure and a temperature of the intelligent power module.
It is to be understood that, in a preferred embodiment, the parameter obtaining unit 8 may be configured to execute step S201.
The frequency control unit 9 is used to control the compressor frequency based on the high pressure and the smart power module temperature.
Specifically, the frequency control unit 9 is configured to determine a first range in which the high pressure is located and a second range in which the intelligent power module temperature is located, determine a change rate of the compressor frequency according to the first range and the second range, and then control the compressor frequency based on the change rate.
Further, the frequency control unit 9 is also configured to determine the rate of change of the compressor frequency to be a normal rate of change when P < P1, T < T1; when P < P1 and T1 is less than or equal to T < T2, determining the change rate of the compressor frequency as a first change rate; when P < P1 and T2 is less than or equal to T < T3, determining the change rate of the compressor frequency as a second change rate; when P < P1, T ≧ T3, the rate of change in the compressor frequency is determined to be 0.
The frequency control unit 9 is also used for determining the change rate of the compressor frequency as a third change rate when P1 is not more than P < P2 and T < T1; determining the rate of change of the compressor frequency as a fourth rate of change when P1 ≦ P < P2, T1 ≦ T < T2; determining the rate of change of the compressor frequency as a fifth rate of change when P1 ≦ P < P2, T2 ≦ T < T3; when P1 is less than or equal to P < P2 and T is more than or equal to T3, the change rate of the compressor frequency is determined to be 0.
The frequency control unit 9 is also used for determining the change rate of the compressor frequency as a sixth change rate when P2 is not more than P < P3 and T < T1; determining the rate of change of the compressor frequency to be a seventh rate of change when P2 ≦ P < P3, T1 ≦ T < T2; when P2 ≦ P < P3, T2 ≦ T < T3, it is determined that the rate of change of the compressor frequency is 0.
The frequency control unit 9 is also used to determine the rate of change of the compressor frequency to be 0 when P ≧ P3 or T ≧ T3.
Wherein, P is a high pressure, P1 is a preset first pressure threshold, P2 is a preset second pressure threshold, P3 is a preset third pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
It will be appreciated that in a preferred embodiment, the frequency control unit 9 is operable to perform step S202, sub-step S2021 and sub-step S2022.
In summary, according to the compressor frequency control method, the compressor frequency control device and the air conditioner provided by the embodiments of the present invention, the compressor frequency is controlled based on the high-pressure and the temperature of the intelligent power module by acquiring the high-pressure and the temperature of the intelligent power module; the protection threshold values of the high pressure and the temperature of the intelligent power module are matched as much as possible due to the integration of the high pressure and the temperature of the intelligent power module, so that the frequency limiting or frequency reducing operation of the compressor can be avoided when the frequency of the compressor is controlled, the high pressure and the temperature of the intelligent power module are closer to the critical values, and the high-temperature refrigerating capacity of the air conditioner is improved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A compressor frequency control method, characterized in that the compressor frequency control method comprises:
acquiring high pressure and intelligent power module temperature;
determining a first range in which the high pressure is located and a second range in which the intelligent power module temperature is located;
determining a rate of change of compressor frequency from the first range and the second range;
wherein the step of determining a rate of change of the compressor frequency in dependence on the first range and the second range comprises: when P is larger than or equal to P3 or T is larger than or equal to T3, determining the change rate of the compressor frequency to be 0; wherein P is a high pressure, P3 is a preset third pressure threshold, T is an intelligent power module temperature, and T3 is a preset third temperature threshold;
controlling the compressor frequency based on the rate of change.
2. The compressor frequency control method of claim 1, wherein the step of determining a rate of change of the compressor frequency from the first range and the second range comprises:
determining a rate of change of the compressor frequency to be a normal rate of change when P < P1, T < T1;
determining the rate of change of the compressor frequency to be a first rate of change when P < P1, T1 ≦ T < T2;
determining the rate of change of the compressor frequency to be a second rate of change when P < P1, T2 ≦ T < T3;
when P < P1 and T is more than or equal to T3, determining the change rate of the compressor frequency to be 0;
wherein, P is a high pressure, P1 is a preset first pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
3. The compressor frequency control method of claim 1, wherein the step of determining a rate of change of the compressor frequency from the first range and the second range comprises:
determining the rate of change of the compressor frequency to be a third rate of change when P1 is less than or equal to P < P2 and T < T1;
determining the rate of change of the compressor frequency to be a fourth rate of change when P1 ≦ P < P2, T1 ≦ T < T2;
determining the rate of change of the compressor frequency as a fifth rate of change when P1 ≦ P < P2, T2 ≦ T < T3;
when P1 is not less than P < P2 and T is not less than T3, determining the change rate of the compressor frequency to be 0;
wherein, P is high pressure, P1 is a preset first pressure threshold, P2 is a preset second pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
4. The compressor frequency control method of claim 1, wherein the step of determining a rate of change of the compressor frequency from the first range and the second range comprises:
determining the rate of change of the compressor frequency as a sixth rate of change when P2 is less than or equal to P < P3 and T < T1;
determining the rate of change of the compressor frequency to be a seventh rate of change when P2 ≦ P < P3, T1 ≦ T < T2;
determining the rate of change of the compressor frequency to be 0 when P2 ≦ P < P3, T2 ≦ T < T3;
wherein, P is a high pressure, P1 is a preset first pressure threshold, P2 is a preset second pressure threshold, P3 is a preset third pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
5. Compressor frequency control device, characterized in that the compressor frequency control device (7) comprises:
the parameter acquisition unit (8) is used for acquiring high-pressure and intelligent power module temperature;
the frequency control unit (9) is used for determining a first range where the high-pressure is located and a second range where the intelligent power module temperature is located;
the frequency control unit (9) is also used for determining the change rate of the compressor frequency to be 0 when P is larger than or equal to P3 or T is larger than or equal to T3; wherein P is a high pressure, P3 is a preset third pressure threshold, T is an intelligent power module temperature, and T3 is a preset third temperature threshold;
the frequency control unit (9) is further configured to control the compressor frequency based on the rate of change.
6. The compressor frequency control arrangement according to claim 5, characterized by the frequency control unit (9) being further configured to determine the rate of change of the compressor frequency to be a normal rate of change when P < P1, T < T1;
the frequency control unit (9) is further configured to determine the rate of change of the compressor frequency to be a first rate of change when P < P1, T1 ≦ T < T2;
the frequency control unit (9) is further configured to determine the rate of change of the compressor frequency to be a second rate of change when P < P1, T2 ≦ T < T3;
the frequency control unit (9) is also used for determining the change rate of the compressor frequency to be 0 when P is less than P1 and T is more than or equal to T3;
wherein, P is a high pressure, P1 is a preset first pressure threshold, T is an intelligent power module temperature, T1 is a preset first temperature threshold, T2 is a preset second temperature threshold, and T3 is a preset third temperature threshold.
7. An air conditioner, characterized in that the air conditioner (1) comprises:
a memory (2);
a controller (3);
the temperature sensor (4) is electrically connected with the controller (3) and is used for collecting the temperature of the intelligent power module and transmitting the temperature of the intelligent power module to the controller (3);
the pressure sensor (5) is electrically connected with the controller (3) and used for collecting high-pressure and transmitting the high-pressure to the controller (3); and
a compressor frequency control device (7), said compressor frequency control device (7) being mounted to said memory (2) and comprising one or more software functional modules executed by said controller (3), said compressor frequency control device (7) comprising:
the parameter acquisition unit (8) is used for acquiring high-pressure and intelligent power module temperature;
the frequency control unit (9) is used for determining a first range where the high-pressure is located and a second range where the intelligent power module temperature is located;
the frequency control unit (9) is also used for determining the change rate of the compressor frequency to be 0 when P is larger than or equal to P3 or T is larger than or equal to T3; wherein P is a high pressure, P3 is a preset third pressure threshold, T is an intelligent power module temperature, and T3 is a preset third temperature threshold;
the frequency control unit (9) is further configured to control the compressor frequency based on the rate of change.
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| CN110513823B (en) * | 2019-09-05 | 2021-04-02 | 宁波奥克斯电气股份有限公司 | Temperature control method and device of intelligent power module and air conditioner |
| CN110425711B (en) * | 2019-09-05 | 2021-12-21 | 宁波奥克斯电气股份有限公司 | Temperature control method and device of intelligent power module and air conditioner |
| CN111780381B (en) * | 2020-06-01 | 2021-08-03 | 珠海格力电器股份有限公司 | Fan control method and device and air conditioner external unit |
| CN113266971B (en) * | 2021-04-11 | 2023-04-28 | 浙江中广电器集团股份有限公司 | Defrosting high-pressure control method, processor and variable-frequency water machine |
| CN114112459B (en) * | 2021-10-29 | 2023-08-15 | 青岛海尔空调电子有限公司 | Air conditioner test operation control method and air conditioner |
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