CN110929408B - Compressor frequency calculation of variable frequency air conditioner - Google Patents
Compressor frequency calculation of variable frequency air conditioner Download PDFInfo
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- CN110929408B CN110929408B CN201911213143.XA CN201911213143A CN110929408B CN 110929408 B CN110929408 B CN 110929408B CN 201911213143 A CN201911213143 A CN 201911213143A CN 110929408 B CN110929408 B CN 110929408B
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Abstract
The invention discloses a compressor frequency calculation method of a variable frequency air conditioner, which comprises the following steps: s1, parameter definition; and S2, calculating the running target frequency, and determining an initial frequency target according to the temperature. According to the invention, by controlling the operating frequency of the variable frequency compressor, the fluctuation of the indoor environment temperature caused by large-amplitude frequency adjustment can be effectively prevented, the real-time adjustment of the operating frequency of the compressor can be effectively carried out in real time, and the comfort of the variable frequency air conditioner is improved; the more linear adjustment of the running frequency of the compressor can also achieve the set temperature required by a user more quickly, and the energy-saving effect is achieved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a compressor frequency calculation method of a variable frequency air conditioner.
Background
The popularization of the air conditioner is the result of pursuit of the quality of life of people, the common household variable frequency air conditioner is also the main household electric energy consumption object at present, and the invention provides a frequency calculation mode of the variable frequency air conditioner compressor directly powered by solar energy aiming at the use state of the household air conditioner with a large amount of electric energy consumption.
The invention provides a linear compressor frequency control and calculation mode, which can quickly adjust the target frequency of the compressor operation in real time according to the temperature change in the current use environment, so that the use is more energy-saving and more appropriate.
Disclosure of Invention
According to the invention, by controlling the operating frequency of the variable frequency compressor, the fluctuation of the indoor environment temperature caused by large-amplitude frequency adjustment can be effectively prevented, the real-time adjustment of the operating frequency of the compressor can be effectively carried out in real time, and the comfort of the variable frequency air conditioner is improved; the more linear adjustment of the running frequency of the compressor can also achieve the set temperature required by a user more quickly, achieve the energy-saving effect and solve the problems in the background art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a compressor frequency of inverter air conditioner calculates, when controlling compressor running frequency, only prescribe a limit to its operating range, in the operating frequency scope of injecing, the compressor can the target frequency carry out the calculation of current operation target frequency according to the change of indoor side temperature, confirm initial compressor start-up frequency according to indoor side target frequency, confirm compressor final operation target frequency according to indoor side ambient temperature again, the indoor side temperature change of higher accuracy, compressor running frequency is more meticulous control, there is the fluctuation of effectual reduction compressor running frequency and indoor difference in temperature, use and improve the suitability of using, more energy consumption saves, specifically include the following steps:
s1, parameter definition:
fob1, calculating a target frequency 1 (calculated temperature difference);
FTobj is the temperature compensation frequency (temperature variation compensation frequency value);
frun the compressor operating frequency; frun = Fob1+ FTobj;
tr: indoor ambient temperature, TS: setting the temperature;
mode temperature difference, wherein delta Td = Tr-TS in a refrigerating mode and delta Td = TS-Tr in a heating mode;
freq _ H: maximum operating frequency Freq _ L: running the lowest frequency;
t1: a time of temperature change;
tm: a time base number;
Δ F: compensating the frequency;
n is a compression frequency interval constant which generally takes a value of 4;
s2, calculating the running target frequency, and determining an initial frequency target according to the temperature:
a) When the current temperature difference is equal to or greater than Th (generally 4 ℃), the operating target frequency is compressed: freq _ H;
b) When the current temperature difference is between TL (generally value 0 ℃) and Th (generally value 4 ℃), fob1 runs according to the difference calculation value of the temperature, and the calculation formula is as follows:
Fobj＝(ΔTd*(Freq_H-Freq_L)/n)+Freq_L
c) When the current temperature difference is less than TL (generally 0 ℃) but more than TL-1 ℃, compressing the operation target frequency: freq _ L;
d) When the current temperature difference is less than TL-1 ℃, the current FTobj =0.
Preferably, in S2, the compressor currently calculates a target rotation speed operation Tm (generally, 2-5 minutes), and adjusts and compensates the operation frequency according to the current room internal environment temperature change direction, where the compensation time is generally an accumulation time Tsum, and the integral multiple of Tm is taken for accumulation compensation, specifically, as follows:
a) When the current temperature difference is equal to or greater than Th (generally 4 ℃), the operating target frequency is compressed: freq _ H;
b) When the current temperature difference is between TL (generally taking 0 ℃) +1 ℃ -Th (generally taking 4 ℃), temperature compensation calculation is carried out according to the temperature change of the room at the indoor side, and the current running frequency is updated once in each Tm time, which is specifically as follows:
fobj = Frun + (Tsum/Tm), the maximum operating frequency cannot exceed Freq _ H during frequency compensation;
c) When the current temperature difference is between TL (generally 0 ℃) and +1 ℃, the current operating frequency is maintained:
d) When the current temperature difference is between TL (generally 0 ℃) and TL (generally 0 ℃) to minus 1 ℃, the compensation of the running frequency of the compressor is canceled step by step, and the specific formula is as follows:
fobj = Frun- (Tsum/Tm), and during cancellation of frequency compensation, the minimum operating frequency cannot be lowered by Freq _ L;
e) When the current temperature difference is less than TL (generally, the value is 0 ℃) to 1 ℃, the compressor stops running.
Compared with the prior art, the frequency calculation method of the compressor of the variable frequency air conditioner provided by the invention has the following steps:
the invention only limits the operation range of the compressor when controlling the operation frequency of the compressor, in the limited operation frequency range, the compressor can calculate the current operation target frequency according to the change of the indoor side temperature, the initial compressor starting frequency is determined according to the indoor side target frequency, the final operation target frequency of the compressor is determined according to the indoor side environment temperature, the indoor side temperature change with higher precision is realized, the operation frequency of the compressor is more finely controlled, the fluctuation of the operation frequency of the compressor and the indoor temperature difference is effectively reduced, the use suitability is improved, and the energy consumption is more saved.
Drawings
FIG. 1 is a graph of a target frequency calculation according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A compressor frequency calculation of a variable frequency air conditioner is disclosed, when the compressor operation frequency is controlled, only the operation range is limited, in the limited operation frequency range, the compressor target frequency can calculate the current operation target frequency according to the change of the indoor side temperature, the initial compressor starting frequency is determined according to the indoor side target frequency, then the final operation target frequency of the compressor is determined according to the indoor side environment temperature, the indoor side temperature change with higher precision is realized, the compressor operation frequency is more finely controlled, the fluctuation of the compressor operation frequency and the indoor temperature difference is effectively reduced, the use suitability is improved, and the energy consumption is more saved, and the method specifically comprises the following steps:
s1, parameter definition:
fob1, calculating a target frequency 1 (calculated temperature difference);
FTobj is the temperature compensation frequency (temperature variation compensation frequency value);
frun the compressor operating frequency; frun = Fob1+ FTobj;
tr: indoor ambient temperature, TS: setting the temperature;
mode temperature difference, wherein delta Td = Tr-TS in a refrigerating mode and delta Td = TS-Tr in a heating mode;
freq _ H: maximum operating frequency Freq _ L: running the lowest frequency;
t1: time of temperature change;
tm: a time base;
Δ F: compensating the frequency;
n is a compression frequency interval constant which generally takes a value of 4;
s2, calculating the running target frequency, and determining an initial frequency target according to the temperature, as shown in FIG. 1:
a) When the current temperature difference is equal to or greater than Th (generally 4 ℃), the operating target frequency is compressed: freq _ H;
b) When the current temperature difference is between TL (generally at 0 ℃) and Th (generally at 4 ℃), fob1 runs according to the difference calculation value of the temperature, and the calculation formula is as follows:
Fobj＝(ΔTd*(Freq_H-Freq_L)/n)+Freq_L
c) When the current temperature difference is less than TL (generally 0 ℃) but more than TL-1 ℃, compressing the operation target frequency: freq _ L;
d) When the current temperature difference is less than TL-1 ℃, the current FTobj =0.
In S2, the compressor currently calculates a target rotation speed operation Tm (generally, 2 to 5 minutes), adjusts and compensates the operation frequency according to the current room internal environment temperature change direction, the compensation time is generally an accumulation time Tsum, and an integral multiple of Tm is taken for accumulation compensation, specifically, as follows:
a) When the current temperature difference is equal to or greater than Th (generally 4 ℃), the operating target frequency is compressed: freq _ H;
b) When the current temperature difference is between TL (generally taking 0 ℃) +1 ℃ -Th (generally taking 4 ℃), temperature compensation calculation is carried out according to the temperature change of the room at the indoor side, and the current running frequency is updated once in each Tm time, which is specifically as follows:
fobj = Frun + (Tsum/Tm), the maximum operating frequency cannot exceed Freq _ H during frequency compensation;
c) When the current temperature difference is between TL (generally value 0 ℃) DEG C-TL (generally value 0 ℃) +1 ℃, the current operating frequency is kept:
d) When the current temperature difference is between TL (generally value 0 ℃) DEG C and TL (generally value 0 ℃) minus 1 ℃, the compensation of the running frequency of the compressor is cancelled step by step, and the specific formula is as follows:
fobj = Frun- (Tsum/Tm), and during cancellation of frequency compensation, the minimum operating frequency cannot be lowered by Freq _ L;
e) When the current temperature difference is less than TL (generally, the value is 0 ℃) to 1 ℃, the compressor stops running.
Therefore, the invention can effectively prevent the fluctuation of the indoor environment temperature caused by large-amplitude frequency adjustment by controlling the operating frequency of the variable-frequency compressor, can effectively adjust the operating frequency of the compressor in real time in more real time, and increases the comfort of the variable-frequency air conditioner; the more linear adjustment of the running frequency of the compressor can also achieve the set temperature required by a user more quickly, and the energy-saving effect is achieved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. A compressor frequency calculation method of a variable frequency air conditioner is characterized in that when the compressor running frequency is controlled, only the running range of the compressor is limited, in the limited running frequency range, the compressor can calculate the current running target frequency according to the change of the indoor side temperature, the initial compressor starting frequency is determined according to the indoor side target frequency, the final running target frequency of the compressor is determined according to the indoor side environment temperature, the indoor side temperature change with higher precision is realized, the compressor running frequency is more finely controlled, the fluctuation of the compressor running frequency and the indoor temperature difference is effectively reduced, the use suitability is improved, the energy consumption is more saved, and the method specifically comprises the following steps:
s1, parameter definition:
fob1, calculating a target frequency 1, wherein the frequency 1 is a temperature difference calculation value;
FTobj is the temperature compensation frequency which is the temperature change compensation frequency value;
frun is the compressor operating frequency; frun = Fob1+ FTobj;
tr: indoor ambient temperature, TS: setting a temperature;
mode temperature difference, wherein delta Td = Tr-TS in a refrigerating mode and delta Td = TS-Tr in a heating mode;
freq _ H: maximum operating frequency Freq _ L: running the lowest frequency;
t1: time of temperature change;
tm: a time base;
Δ F: compensating the frequency;
n is a compression frequency interval constant;
s2, calculating the running target frequency, and determining an initial frequency target according to the temperature:
a) When the current temperature difference is equal to or greater than Th, the operating target frequency is compressed: freq _ H;
b) When the current temperature difference is TL-Th, fob1 operates according to the difference value of the temperature, and the calculation formula is as follows:
Fobj=(ΔTd*(Freq_H-Freq_L)/n)+Freq_L
c) When the current temperature difference is less than TL but greater than TL-1 deg.C, the compression runs the target frequency: freq _ L;
d) When the current temperature difference is less than TL-1 ℃, the current FTobj =0.
2. The method for calculating the frequency of the compressor of the inverter air conditioner according to claim 1, wherein: in S2, the compressor calculates a target rotating speed operation Tm score currently, the operation frequency is adjusted and compensated according to the current room internal environment temperature change direction, the compensation time is accumulation time Tsum, and integral multiples of Tm are taken for accumulation compensation, and the method specifically comprises the following steps:
a) When the current temperature difference is equal to or greater than Th, the compression operation target frequency: freq _ H;
b) When the current temperature difference is between TL +1 ℃ and Th, temperature compensation calculation is carried out according to the temperature change of the room at the inner side of the room, and the current running frequency is updated once in each Tm time, which is specifically as follows:
fobj = Frun + (Tsum/Tm), the maximum operating frequency cannot exceed Freq _ H during frequency compensation;
c) When the current temperature difference is TL-TL +1 ℃, keeping the current operating frequency:
d) When the current temperature difference is between TL ℃ and TL-1 ℃, the compensation of the running frequency of the compressor is cancelled step by step, and the specific formula is as follows:
fobj = Frun- (Tsum/Tm), the minimum operating frequency cannot be lowered by Freq _ L during cancellation of frequency compensation;
e) When the current temperature difference is less than TL-1 ℃, the compressor stops running.
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