CN108692425B - Air conditioner defrosting control method - Google Patents

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method of an air conditioner. In order to prevent the room temperature from fluctuating too much during defrosting, the defrosting control method of the invention comprises the following steps: calculating the accumulated power consumption W of the air conditioner in real time from the first time the air conditioner enters the defrosting mode after starting_Accumulation(ii) a Comparing the accumulated consumed power W_AccumulationAnd judging whether the air conditioner enters the defrosting mode again according to the comparison result with the preset consumed power W. The invention can more accurately judge the time when the air conditioner enters the defrosting mode by taking the preset consumed power W as the reference, thereby avoiding the frequent defrosting phenomenon. And the influence on the indoor temperature in the defrosting process can be reduced to the maximum extent according to the accumulated power consumption of the air conditioner, so that the indoor temperature cannot fluctuate greatly.

Description

Air conditioner defrosting control method

technical field

The invention belongs to the technical field of air conditioners, and in particular relates to a defrosting control method for an air conditioner.

Background technique

As a device that can adjust the indoor ambient temperature, the air conditioner works as follows: the indoor ambient temperature is lowered or raised by the refrigerant passing through the high-pressure/low-pressure/gaseous/liquid state transition between the circulating pipelines, that is, from From the perspective of the indoor unit, the air conditioner is in cooling or heating mode. When the air conditioner is running for heating, under certain humidity conditions, if the temperature of the outdoor coil is too low, it will cause frost, and the frost on the outdoor coil will reduce the heat exchange efficiency of the outdoor heat exchanger and affect the performance of the air conditioner. The thermal effect reduces the comfort of the indoor environment and affects the user experience. Therefore, when the air conditioner is in the heating condition, it is necessary to timely and effectively defrost the outdoor coil of the air conditioner.

During the heating process of the existing household air conditioner, if the outdoor humidity is high and the conditions for frosting are reached, the outdoor machine will be frosted, and the frosting directly affects the operating power of the air conditioner, that is, when the outdoor unit is frosted. When the operating power of the air conditioner is reduced, the indoor heating capacity is reduced, which directly affects the indoor temperature. Existing air conditioners generally use the operating time + outdoor coil temperature to determine whether to enter the defrost, but this method cannot directly reflect the change of indoor temperature, and what really affects the user's experience is the indoor temperature.

Based on this, the present invention is proposed.

SUMMARY OF THE INVENTION

In order to solve the above problems in the prior art, in order to prevent the room temperature from fluctuating too much during defrosting, the present invention proposes a defrosting control method for an air conditioner. The defrosting control method includes the following steps: after the air conditioner is turned on, the first Once the defrost mode is entered, the accumulative power consumption W of the air conditioner is calculated in real time; the _{accumulative power consumption W accumulative is} compared with the preset power consumption W, and the air conditioner is judged whether to enter the defrost mode again according to the comparison result.

In a preferred embodiment of the above air conditioner defrosting control method, the step of "compare the accumulated power consumption W _cumulative with the preset power consumption W, and determine whether to make the air conditioner enter the defrosting mode again according to the comparison result" includes: if 0.9 W≤W _accumulative <W, reduce the compressor operating frequency and continue the heating operation.

In a preferred embodiment of the above air conditioner defrosting control method, if _{0.9W≤Wcumulative} <W, the compressor operating frequency is reduced by 20%.

In a preferred embodiment of the above air conditioner defrosting control method, the step of "compare the accumulated power consumption W cumulative with the preset power consumption W, and determine whether to make the air conditioner enter the defrosting mode again according to the comparison result" includes: if W _Accumulated ≥W, then make the air conditioner enter the defrost mode again.

In a preferred embodiment of the above air conditioner defrosting control method, the preset power consumption W is determined by: setting a judgment condition for entering defrost; when the judgment condition is satisfied, the air conditioner enters a defrosting mode ; Calculate the cumulative power consumption W _n of the air conditioner between two adjacent defrosting modes; calculate the average value of multiple cumulative power consumption W _n , and use the average value as the preset power consumption W.

In a preferred embodiment of the above-mentioned air conditioner defrosting control method, the step of "setting the judgment condition for entering the defrost" includes: setting the condition for the air conditioner to enter the defrost mode according to the temperature of the outdoor unit coil.

In a preferred embodiment of the above air conditioner defrosting control method, in the step of "calculating the average value of a plurality of cumulative power consumption W _n , and using the average value as the preset power consumption W", the "multiple cumulative power consumption W n" The power consumption W _n ″ includes at least W ₁ , W ₂ , and W ₃ .

In a preferred embodiment of the above air conditioner defrosting control method, in the step of "calculating the _accumulated power consumption W of the air conditioner in real time from the first time the air conditioner enters the defrosting mode after the air conditioner is turned on", the first The time to enter the defrost mode is the preset time.

In a preferred embodiment of the above air conditioner defrosting control method, the preset time is determined according to the following steps: obtaining the model of the air conditioner and the external environment temperature and humidity values of the application scene of the air conditioner; The time when the air conditioner first enters the defrost mode after the air conditioner is turned on is obtained through experiments.

In a preferred embodiment of the above air conditioner defrosting control method, the defrosting control method further includes: when the conditions for entering the defrosting mode are satisfied, defrosting is performed by changing the direction of the four-way valve; wherein, each defrosting operation is performed. The time of the mode is a preset fixed time

The present invention determines whether the _accumulative power consumption W of the air conditioner reaches the level that needs to be defrosted again by calculating the _accumulative power consumption W of the air conditioner and comparing it with the preset power consumption W. Using the preset power consumption W as the benchmark can more accurately determine the timing of the air conditioner entering the defrosting mode, and avoid frequent defrosting. And according to the cumulative power consumption of the air conditioner, the influence on the indoor temperature during the defrosting process can be reduced to the greatest extent, so that the indoor temperature will not fluctuate greatly.

Description of drawings

FIG. 1 is a main flow chart of a defrosting control method for an air conditioner according to the present invention.

Detailed ways

In order to make the embodiments, technical solutions and advantages of the present invention more obvious, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some of the embodiments of the present invention, not all of them. Example. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principle of the present invention, and are not intended to limit the protection scope of the present invention.

As shown in FIG. 1, the air conditioner defrosting control method of the present invention includes the following steps: S110, starting from the first time the air conditioner enters the defrosting mode after the air conditioner is turned on, calculate the _accumulated power consumption W of the air conditioner in real time; S120, compare the accumulated power consumption The power consumption W is _accumulated with the preset power consumption W, and according to the comparison result, it is judged whether to make the air conditioner enter the defrosting mode again. It can be understood by those skilled in the art that the air conditioner starts to defrost and then re-enters defrost as an operation cycle, and the cycle includes defrost operation and heating operation. Then, the accumulated power consumption of the air conditioner in one operation period can be considered as fixed, that is, the accumulated power consumption of the air conditioner in one operation period is the preset power consumption W. Therefore, starting from the first time the air conditioner enters the defrost mode after it is turned on, by calculating the _accumulated power consumption W of the air conditioner, and comparing the value of the _accumulated W and W, it is possible to accurately determine whether to make the air conditioner enter the defrost mode again.

As an example, the preset power consumption W may be determined in the following manner: first, setting the judgment condition for entering defrost, such as setting the condition for the air conditioner to enter the defrost mode according to the temperature of the outdoor unit coil. When the judgment condition is met, the air conditioner enters the defrosting mode, and then the accumulated power consumption W _n of the air conditioner is calculated. When the judgment condition is met again, the currently calculated accumulated power consumption W _n is saved as W ₁ ; After entering the defrosting mode, recalculate the accumulative power consumption W _n of the air conditioner. When the judgment condition is met again, save the currently calculated accumulative power consumption W _n as W ₂ ; The accumulated power consumption W ₁ , W ₂ , W ₃ ... W _n between entering the defrosting mode; then calculate the average value of the accumulated power consumption W ₁ , W ₂ , W ₃ ... W _n , which is the preset power consumption Power W.

Those skilled in the art can understand that the accumulated power consumption of the air conditioner can be calculated by means of integration, and the detailed calculation method will not be described here. The cumulative power consumption of multiple groups of air conditioners in each operating cycle (the air conditioner from entering defrosting to the next defrosting is one operating cycle) is obtained through experiments. The more data obtained from the test, the higher the preset power consumption W. precise. In addition, any reasonable judgment conditions can be flexibly selected for the defrosting judgment conditions set in the test process, which do not deviate from the protection scope of the present invention.

In step S120, when _{0.9W≤Wcumulative} <W, the compressor operating frequency can be reduced and the heating operation can be continued. For example, reducing the compressor operating frequency by 20% can delay the time to enter the defrosting. When the _accumulated W is greater than or equal to W, it means that the accumulated power consumption of the air conditioner reaches the preset power consumption W, that is, defrosting can be performed, and at this time, the air conditioner enters the defrosting mode again.

It should be noted that, in step S110, the time when the air conditioner first enters the defrosting mode after it is turned on may be a preset time. For example, according to the model of the air conditioner and the external ambient temperature and humidity values of the application scenario of the air conditioner, the designer obtains the time when the air conditioner first enters the defrost mode after the air conditioner is turned on through experiments. For example, run the air conditioner in the target environment, observe the frosting condition of the air conditioner, and then record the defrosting time and the data of the corresponding air conditioner model, ambient temperature and humidity value. The data obtained from the test finally determines the time when the air conditioner first enters the defrost after it is turned on. Those skilled in the art can also flexibly select other reasonable test methods to obtain the time when the air conditioner first starts to defrost after it is turned on, which will not be described in detail here.

As an example, the air conditioner defrosting control method of the present invention adopts the shutdown defrosting mode, that is, when the conditions for entering the defrosting mode are satisfied, the defrosting is performed by changing the direction of the four-way valve. The time for each defrost is set as a fixed time. In this defrosting mode, the air conditioner does not perform heating, and the air conditioner does not consume power at this time, so the _accumulated power consumption W of the air conditioner can be calculated after the first defrosting mode ends. Those skilled in the art can easily understand that in this mode, since the accumulated power consumption in the defrosting mode is 0, even if the _accumulated power consumption Qcumulative of the air conditioner is calculated from the beginning of entering the defrosting mode, it will not affect the judgment. result.

As an example, if the air conditioner defrosting control method of the present invention adopts the non-stop defrosting mode, that is, when the conditions for entering the defrosting mode are met, the bypass pipeline is opened to defrost, that is, the air conditioner is in the process of heating the room. At the same time, defrost the outdoor unit using the bypass line. At this time, since the air conditioner still has a part of the heating capacity in the defrosting mode, that is, it will consume a part of the power, so the _accumulated power consumption W of the air conditioner can be calculated at the beginning of the first defrosting mode. Those skilled in the art can understand that, if the power consumed by the air conditioner in the defrosting mode is not considered when determining the preset power consumption W, when the non-stop defrosting mode is adopted, the defrosting mode can also be started after the end of the defrosting mode. Calculate the cumulative power consumption W _cumulative of the air conditioner.

To sum up, the present invention determines whether the _accumulative power consumption W of the air conditioner reaches the level that needs to be defrosted again by calculating the _accumulative power consumption W of the air conditioner and comparing it with the preset power consumption W. Using the preset power consumption W as the benchmark can more accurately determine the timing of the air conditioner entering the defrosting mode, and avoid frequent defrosting. And according to the cumulative power consumption of the air conditioner, the influence on the indoor temperature during the defrosting process can be reduced to the greatest extent, so that the indoor temperature will not fluctuate greatly.

So far, the technical solutions of the present invention have been described with reference to the preferred embodiments shown in the accompanying drawings, however, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (9)

1. A defrosting control method for an air conditioner, wherein the defrosting control method comprises the following steps: Starting from the first time the air conditioner enters the defrost mode after it is turned on, it will enter the defrost to the next time and then enter the defrost as an operation cycle, and calculate the _cumulative power consumption W of the air conditioner in each operation cycle; Comparing the _accumulated power consumption W with the preset power consumption W, and determining whether to make the air conditioner enter the defrosting mode again according to the comparison result; Wherein, the preset power consumption W is determined in the following manner: Set the judgment condition for entering defrost; When the judgment condition is satisfied, the air conditioner enters the defrosting mode; Calculate the accumulated power consumption W _n of the air conditioner between two adjacent defrosting modes; An average value of a plurality of accumulated power consumption W _n is calculated, and the average value is used as the preset power consumption W. 2. The air conditioner defrosting control method according to claim 1, characterized in that "compare the accumulated power consumption W _cumulative with the preset power consumption W, and judge whether to make the air conditioner enter the defrosting mode again according to the comparison result" The steps include: If _{0.9W≤Wcumulative} <W, reduce the compressor operating frequency and continue heating operation. 3 . The defrosting control method for an air conditioner according to claim 2 , wherein if 0.9W≦ _Wcumulative <W, the compressor operating frequency is reduced by 20%. 4 . 4. The air conditioner defrosting control method according to claim 1, characterized in that "compare the accumulative power consumption W _cumulative with the preset power consumption W, and judge whether to make the air conditioner enter the defrosting mode again according to the comparison result" The steps include: If W _accumulated ≥W, make the air conditioner enter the defrost mode again. 5. The air conditioner defrosting control method according to claim 1, wherein the step of "setting the judgment condition for entering defrosting" comprises: The conditions for putting the air conditioner into defrost mode are set according to the temperature of the outdoor unit coil. 6 . The defrosting control method for an air conditioner according to claim 1 , wherein, in the step of “calculating the average value of a plurality of accumulated power consumption W _n , and using the average value as the preset power consumption W”, 6 . The "plurality of accumulated power consumption W _n " includes at least W ₁ , W ₂ , and W ₃ . 7. The air conditioner defrosting control method according to claim 1, characterized in that, "starting from the first time the air conditioner enters the defrost mode after the air conditioner is turned on, it will be an operation cycle from entering the defrost to the next time and then entering the defrost mode. In the step of calculating the _cumulative power consumption W of the air conditioner in each operation cycle, the time when the air conditioner first enters the defrosting mode after the air conditioner is turned on is a preset time. 8. The air conditioner defrosting control method according to claim 7, wherein the preset time is determined according to the following steps: Obtain the model of the air conditioner and the external ambient temperature and humidity values of the application scenario of the air conditioner; According to the model of the air conditioner, the external ambient temperature and humidity value of the application scenario, the time when the air conditioner first enters the defrost mode after it is turned on is obtained through experiments. 9. The air conditioner defrosting control method according to any one of claims 1 to 8, wherein the defrosting control method further comprises: When the conditions for entering the defrosting mode are met, defrost is performed by reversing the four-way valve; Wherein, the time for each operation of the defrosting mode is a preset fixed time.

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