A motor drive system and a drive method for air conditioner

Abstract

The present invention discloses a motor driving method for air conditioning, comprising: step S100, manually setting an indoor temperature value, detecting the initial indoor temperature, and obtaining the actual indoor heating efficiency per unit time; step S200, simultaneously monitoring the outdoor temperature; step S300, obtaining the heating efficiency of the driving motor, and simultaneously retrieving the indoor heating efficiency and temperature difference data, and calculating the heating consumption; step S400, calculating the temperature maintenance time according to the heating consumption, and selecting the working mode of the driving motor; step S500, extracting a set of time nodes in a historical database when the driving motor adopts the maintenance working mode, and obtaining the temperature difference data corresponding to the time nodes in the set, and by predicting the outdoor temperature change trend on the day, obtaining the time period for adopting the maintenance working mode on the day, and automatically selecting the maintenance working mode when the user starts the driving motor in the time period.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a motor drive system and a drive method applied to air conditioners. Background Art

[0002] With the development of economy and society, the living standard of Chinese residents is improving day by day, and in this process, the use of air conditioners is becoming more and more widespread. As an important heating and summer heat relief equipment, air conditioners are loved by residents all over the country, which has made great contributions to improving the living standard of Chinese residents and improving the living system of residents. As a relatively high-end home appliance, the manufacturing level of air conditioners is greatly affected by science and technology. With the continuous improvement of science and technology, the manufacturing level of air conditioner compressors has also been continuously improved.

[0003] When the air conditioner is in use, the temperature sensor detects the current ambient temperature in real time and transmits this information to the air conditioner control system. The control system compares the detected temperature with the temperature set by the user. When the ambient temperature reaches the temperature set by the user, the compressor will stop working. If the ambient temperature deviates from the set temperature within a certain range, the compressor will automatically start to continue cooling or heating. For example, if the detected temperature is higher than the temperature set by the user, the control system will start the compressor and start cooling. On the contrary, if the detected temperature is lower than the temperature set by the user, the control system will turn off the compressor and stop cooling.

[0004] Because when the indoor temperature reaches the set temperature, the drive motor will stop working. When the temperature difference between the outdoor environment and the indoor environment is large, such as hot weather of 30° or cold weather of 0°, the indoor temperature will deviate from the set temperature within a certain range within a short period of time after the drive motor stops working, causing the drive motor to start again. The time between the restart and the last shutdown is short, resulting in frequent starts and stops of the motor. Since the current when the motor starts is 6 to 8 times the normal rated (working) current, frequent starts may have a greater impact on the life of the motor, which may cause the motor to overheat, accelerate aging of the insulation, or even burn out. Summary of the invention

[0005] The object of the present invention is to provide a motor driving system and a driving method for an air conditioner to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a motor driving method applied to an air conditioner, the motor driving method comprising:

[0007] Step S100, manually set the indoor temperature value, detect the initial indoor temperature, and obtain the actual indoor heating efficiency per unit time;

[0008] Step S200, simultaneously monitoring the outdoor temperature, and integrating the monitored outdoor temperature information to obtain the change trend of the outdoor temperature, and the temperature difference data between the outdoor temperature and the indoor initial temperature;

[0009] Step S300, obtaining the heating efficiency of the driving motor, and at the same time retrieving the actual heating efficiency and temperature difference data in the room, and calculating the heating consumption;

[0010] Step S400, calculating the temperature maintenance time according to the temperature consumption, when the temperature maintenance time is less than the set threshold, the working mode of the driving motor is selected as the maintenance working mode, if the temperature maintenance time is greater than the set threshold, the working mode of the driving motor is selected as the intermittent working mode, and the above data is stored in the history database;

[0011] Step S500, extract the set of time nodes in the historical database when the drive motor adopts the maintenance working mode, and obtain the temperature difference data corresponding to the time nodes in the set, and obtain the time period when the maintenance working mode is adopted on the day by predicting the outdoor temperature change trend on the day, and automatically select the maintenance working mode when the user starts the drive motor in this time period.

[0012] Furthermore, the step S100 includes: recording the temperature change set {(K 1 , t 1 ), (K 2 , t 2 ), …(K n , t n )};

[0013] Among them (K 1 , t 1 ), (K 2 , t 2 ), …(K n , t n ) respectively represent the n The indoor temperature at the time point K n , and calculate the actual heating efficiency set {(P 1 , T 2 ), (P 2 , T 3 ),…(P n , T n+1 )}where (P 1 , T 2 ), (P 2 , T 3 ),…(P n , T n+1 ) indicates that in T n+1 The actual indoor heating efficiency P during the time period n .

[0014] Furthermore, the step S200 includes:

[0015] Step S201: record the outdoor temperature set as

[0016] in Respectively expressed in t n The outdoor temperature at the time

[0017] Step S202: extract n The outdoor temperature at the time point And the indoor temperature Kn, and calculate according to the following formula:

[0018] Get the temperature difference data set between indoor temperature and outdoor temperature

[0019] Furthermore, the step S300 includes:

[0020] Step S301, real-time acquisition of the temperature control efficiency set of the drive motor: {(W 1 , T 2 ), (W 2 , T 3 ),…(W n , T n+1 )};

[0021] Among them (W 1 , T 2 ), (W 2 , T 3 ),…(W n , T n+1 ) indicates that in T n+1 The actual temperature control efficiency W of the drive motor during the time period n , while extracting at T n+1 The actual heating efficiency P corresponding to the time period n , and at T n+1 T n+1 Time period t n Temperature difference data at time points

[0022] Step S302: extract the temperature control efficiency W of the drive motor in the same time period. n And its corresponding actual heating efficiency P n Data, get the temperature control efficiency W of the drive motor nAnd its corresponding actual heating efficiency P n The difference between That is the heating consumption.

[0023] Furthermore, the step S400 includes:

[0024] Step S401: The temperature maintenance time is the time it takes for the indoor temperature to change from the set temperature to the warning temperature. The warning temperature is the temperature range in which the motor needs to be driven to start again to control the temperature when the indoor temperature deviates from the set temperature within a certain range; the set time threshold T 阈 If the temperature is maintained for The output selects the working mode of the drive motor to maintain the working mode command. If the temperature is maintained for a certain time Then a command is outputted to select the working mode of the driving motor as the intermittent working mode;

[0025] Step S402, the maintenance working mode is to output a command to drive the motor without stopping after the indoor temperature reaches the set temperature, and reduce the power of the drive motor to a set range; the intermittent working mode is to control the drive motor to stop working after the indoor temperature reaches the set temperature, and control the drive motor to work again when the indoor temperature reaches the warning temperature.

[0026] Furthermore, the step S500 includes: retrieving the temperature difference data corresponding to the time node in the set as temperature difference data set one, predicting the change trend of the outdoor temperature of the day according to the meteorological information, extracting the temperature difference data between the outdoor temperature and the indoor initial temperature as temperature difference data set two, extracting the time period overlapping with the temperature difference data one to form temperature difference data set three, and extracting the time period data corresponding to each temperature difference data in the temperature difference data set three to form a time set; if the drive motor is started within the time period included in the set, the maintenance working mode is automatically selected; if the drive motor is not started within the time period included in the set, the intermittent working mode is selected.

[0027] In order to better implement the above method, a motor driving system applied to the motor driving method of an air conditioner is also proposed, wherein the motor driving system comprises a temperature detection module, a data acquisition module, a data calculation module and a working mode selection module;

[0028] The temperature detection module is used to detect the indoor temperature and the outdoor temperature, and calculate the temperature difference between the indoor and outdoor at each time point, and predict the change trend of the indoor temperature and the change trend of the outdoor temperature, and store the temperature value and the prediction result in the database;

[0029] The data acquisition module is used to collect data on the temperature control efficiency of the driving motor in each time period, and collect and transmit the temperature difference data between indoor and outdoor to the data calculation module;

[0030] The data calculation module integrates and calculates the obtained data information, calculates the actual indoor heating efficiency, the heating efficiency of the driving motor, the heating consumption and the temperature maintenance time, and transmits the calculated data to the working mode selection module;

[0031] The working mode selection module is used to determine the working mode that the drive motor should select based on the calculated result, and output instructions to control the drive motor to select the corresponding working mode.

[0032] Furthermore, the temperature detection module includes an indoor temperature detection unit, an outdoor temperature detection unit, a temperature difference calculation unit and a temperature trend prediction unit. The outdoor temperature detection unit is used to detect the outdoor temperature, the indoor temperature detection unit is used to detect the indoor temperature, the temperature difference calculation unit is used to calculate the temperature difference data between indoor and outdoor, and the temperature trend prediction unit is used to predict the changing trends of the outdoor temperature and the indoor temperature respectively.

[0033] Furthermore, the data acquisition module includes a data collection unit and a data sending unit. The data collection unit is used to collect data information required during the operation of the system, and the data sending unit is used to send the collected data information to the corresponding module.

[0034] Furthermore, the data calculation module includes a heating efficiency calculation unit, a heating consumption calculation unit and a temperature maintenance time calculation unit. The heating efficiency calculation unit is used to calculate the actual heating efficiency of the room and the heating efficiency of the driving motor. The heating consumption calculation unit is used to calculate the power consumed during the heating process. The temperature maintenance time calculation unit is used to calculate the time for which the indoor temperature is maintained within a set temperature range.

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention calculates the length of time that the indoor temperature can be maintained after reaching the set temperature, determines the relationship between the temperature maintenance time and the set threshold, and reasonably selects the working mode of the drive motor, thereby avoiding the frequent start and stop of the motor due to the large temperature difference between indoor and outdoor, thereby avoiding overheating of the motor, accelerated aging of the insulation and even burning, and increasing the service life of the drive motor. At the same time, the temperature difference change trend between the outdoor temperature and the indoor temperature is predicted, and the working mode to be selected in each time period of the day is determined, and the corresponding working mode is automatically selected when it is detected that the drive motor is started in the time period, so as to achieve the purpose of timely selecting the correct working mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0037] Figure 1 It is a flow chart of a motor driving method applied to an air conditioner according to the present invention;

[0038] Figure 2 It is a module schematic diagram of a motor drive system applied to an air conditioner according to the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] See also Figure 1-Figure 2 The present invention provides a technical solution: a motor driving method applied to an air conditioner, the motor driving method comprising:

[0041] Step S100, manually set the indoor temperature value, detect the initial indoor temperature, and obtain the actual indoor temperature efficiency per unit time, where the temperature efficiency includes cooling efficiency and heating efficiency;

[0042] Step S200, simultaneously monitoring the outdoor temperature, and integrating the monitored outdoor temperature information to obtain the change trend of the outdoor temperature, and the temperature difference data between the outdoor temperature and the indoor initial temperature;

[0043] Step S300, obtaining the heating efficiency of the driving motor, and at the same time retrieving the actual heating efficiency and temperature difference data in the room, and calculating the heating consumption;

[0044] Step S400, calculating the temperature maintenance time according to the temperature consumption, when the temperature maintenance time is less than the set threshold, the working mode of the driving motor is selected as the maintenance working mode, if the temperature maintenance time is greater than the set threshold, the working mode of the driving motor is selected as the intermittent working mode, and the above data is stored in the history database;

[0045] Step S500, extract the set of time nodes in the historical database when the drive motor adopts the maintenance working mode, and obtain the temperature difference data corresponding to the time nodes in the set, and obtain the time period when the maintenance working mode is adopted on the day by predicting the outdoor temperature change trend on the day, and automatically select the maintenance working mode when the user starts the drive motor in this time period.

[0046] Step S100 includes:

[0047] Record the temperature change set in the room {(K 1 , t 1 ), (K 2 , t 2 ), …(K n , t n )};

[0048] Among them (K 1 , t 1 ), (K 2 , t 2 ), …(K n , t n ) respectively represent the n The indoor temperature at the time point K n , and calculate the actual heating efficiency set {(P 1 , T 2 ), (P 2 , T 3 ),…(P n , T n+1 )}where (P 1 , T 2 ), (P 2 , T 3 ),…(P n , T n+1 ) indicates that in T n +1 The actual indoor heating efficiency P during the time period n .

[0049] Step S200 includes:

[0050] Step S201: record the outdoor temperature set as

[0051] in Respectively expressed in t n The outdoor temperature at the time

[0052] Step S202: extract n The outdoor temperature at the time point and the room temperature K n, and calculated according to the following formula:

[0053] Get the temperature difference data set between indoor temperature and outdoor temperature

[0054] Step S300 includes:

[0055] Step S301, obtaining the temperature control efficiency set of the drive motor in real time:

[0056] {(W 1 , T 2 ), (W 2 , T 3 ),…(W n , T n+1 )};

[0057] Among them (W 1 , T 2 ), (W 2 , T 3 ),…(W n , T n+1 ) indicates that in T n+1 The actual temperature control efficiency W of the drive motor during the time period n , while extracting at T n+1 The actual heating efficiency P corresponding to the time period n , and at T n+1 T n+1 Time period t n Temperature difference data at time points

[0058] Step S302: extract the temperature control efficiency W of the drive motor in the same time period. n And its corresponding actual heating efficiency P n Data, get the temperature control efficiency W of the drive motor n And its corresponding actual heating efficiency P n The difference between That It is the heating consumption.

[0059] Step S400 includes:

[0060] Step S401: The temperature maintenance time is the time it takes for the indoor temperature to change from the set temperature to the warning temperature. The warning temperature is the temperature range in which the motor needs to be driven to start again to control the temperature when the indoor temperature deviates from the set temperature within a certain range; the time threshold T is set 阈 If the temperature is maintained for The output selects the working mode of the drive motor to maintain the working mode command. If the temperature is maintained for a certain time Then a command is outputted to select the working mode of the driving motor as the intermittent working mode;

[0061] Step S402, the maintenance working mode is to output a command to drive the motor without stopping after the indoor temperature reaches the set temperature, and reduce the power of the drive motor to the set range; the intermittent working mode is to control the drive motor to stop working after the indoor temperature reaches the set temperature, and control the drive motor to work again when the indoor temperature reaches the warning temperature.

[0062] Step S500 includes: retrieving the temperature difference data corresponding to the time node in the set as temperature difference data set 1, predicting the change trend of the outdoor temperature of the day according to the meteorological information, extracting the temperature difference data between the outdoor temperature and the indoor initial temperature as temperature difference data set 2, extracting the time period overlapping with the temperature difference data 1 to form temperature difference data set 3, and extracting the time period data corresponding to each temperature difference data in the temperature difference data set 3 to form a time set, if the drive motor is started within the time period included in the set, the maintenance working mode is automatically selected, and if the drive motor is not started within the time period included in the set, the intermittent working mode is selected.

[0063] Embodiment: The warning temperature is ±3° of the set temperature. When the outdoor temperature is 30°, the initial indoor temperature is 28°, and the set temperature is 20°, the temperature difference between the outdoor temperature and the indoor temperature is 10°. If it is calculated at this time that the indoor temperature is adjusted to 20°, if the air conditioner does not continue to cool, the indoor temperature will rise from 20° to 23° after 5 minutes. After reaching the warning temperature, the drive motor will be triggered to work again. The "5 minutes" is the temperature maintenance time. If the set time threshold is 10 minutes, after determining that the temperature maintenance time is 5 minutes, the working mode of the drive motor is selected as the maintenance working mode. After the indoor temperature reaches the set temperature, the power of the drive motor will be reduced to keep working, so as to avoid frequent starting and stopping of the drive motor in a short period of time.

[0064] In order to better implement the above method, a motor driving system for a motor driving method applied to an air conditioner is also proposed. The motor driving system includes a temperature detection module, a data acquisition module, a data calculation module and a working mode selection module;

[0065] The temperature detection module is used to detect the indoor temperature and the outdoor temperature, calculate the temperature difference between the indoor and outdoor at each time point, predict the changing trend of the indoor temperature and the changing trend of the outdoor temperature, and store the temperature value and the prediction result in the database;

[0066] The data acquisition module is used to collect the data of the heating efficiency of the driving motor in each time period, and collect the temperature difference data between indoor and outdoor to the data calculation module;

[0067] The data calculation module integrates and calculates the obtained data information, calculates the actual indoor heating efficiency, the heating efficiency of the driving motor, the heating consumption and the temperature maintenance time, and transmits the calculated data to the working mode selection module;

[0068] The working mode selection module is used to determine the working mode that the drive motor should select based on the calculated result, and output instructions to control the drive motor to select the corresponding working mode.

[0069] The temperature detection module includes an indoor temperature detection unit, an outdoor temperature detection unit, a temperature difference calculation unit and a temperature trend prediction unit. The outdoor temperature detection unit is used to detect the outdoor temperature, the indoor temperature detection unit is used to detect the indoor temperature, the temperature difference calculation unit is used to calculate the temperature difference data between indoor and outdoor, and the temperature trend prediction unit is used to predict the changing trends of the outdoor temperature and the indoor temperature respectively.

[0070] The data acquisition module includes a data collection unit and a data sending unit. The data collection unit is used to collect the data information required during the operation of the system, and the data sending unit is used to send the collected data information to the corresponding module.

[0071] The data calculation module includes a heating efficiency calculation unit, a heating consumption calculation unit and a temperature maintenance time calculation unit. The heating efficiency calculation unit is used to calculate the actual heating efficiency of the room and the heating efficiency of the driving motor. The heating consumption calculation unit is used to calculate the power consumed in the heating process. The temperature maintenance time calculation unit is used to calculate the time the indoor temperature is maintained within the set temperature range.

[0072] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor driving method for an air conditioner, characterized in that: The motor driving method comprises: Step S100, manually set the indoor temperature value, detect the initial indoor temperature, and obtain the actual indoor heating efficiency per unit time; Step S200, simultaneously monitoring the outdoor temperature, and integrating the monitored outdoor temperature information to obtain the change trend of the outdoor temperature, and the temperature difference data between the outdoor temperature and the indoor initial temperature; Step S300, obtaining the heating efficiency of the driving motor, and at the same time retrieving the actual heating efficiency and temperature difference data in the room, and calculating the heating consumption; Step S400, calculating the temperature maintenance time according to the temperature consumption, when the temperature maintenance time is less than the set threshold, the working mode of the driving motor is selected as the maintenance working mode, if the temperature maintenance time is greater than the set threshold, the working mode of the driving motor is selected as the intermittent working mode, and the above data is stored in the history database; Step S500, extracting a set of time nodes in the history database when the drive motor adopts the maintenance working mode, and obtaining the temperature difference data corresponding to the time nodes in the set, and predicting the outdoor temperature change trend of the day to obtain the time period when the maintenance working mode is adopted on the day, and automatically selecting the maintenance working mode when the user starts the drive motor in the time period; The step S100 includes: recording the temperature change set in the room {(K 1 ,t 1 ),(K 2 ,t 2 ),…(K n ,t n )}; Among them (K 1 , t 1 ), (K 2 , t 2 ), …(K n , t n ) respectively represent the n The indoor temperature at the time point K n , and calculate the actual heating efficiency set {(P 1 , T 2 ), (P 2 , T 3 ),…(P n , T n+1 )}where(P 1 , T 2 ), (P 2 , T 3 ),…(P n , T n+1 ) indicates that at T n+1 The actual indoor heating efficiency P during the time period n ; The step S200 includes: Step S201: record the outdoor temperature set as in Respectively expressed in t n The outdoor temperature at the time Step S202: extract n The outdoor temperature at the time point and the room temperature K n , and calculated according to the following formula: Get the temperature difference data set between indoor temperature and outdoor temperature The step S300 includes: Step S301, obtaining the temperature control efficiency set of the drive motor in real time: {(W 1 ,T 2 ),(W 2 ,T 3 ),…(W n ,T n+1 )}; Among them (W 1 , T 2 ), (W 2 , T 3 ),…(W n , T n+1 ) indicates that at T n+1 The actual temperature control efficiency W of the drive motor during the time period n , while extracting at T n+1 The actual heating efficiency P corresponding to the time period n , and at T n+1 Time period t n Temperature difference data at time points Step S302: extract the temperature control efficiency W of the drive motor in the same time period. n And its corresponding actual heating efficiency P n Data, get the temperature control efficiency W of the drive motor n And its corresponding actual heating efficiency P n The difference between That It is the heating consumption.

2. The motor driving method for air conditioner according to claim 1, characterized in that: The step S400 includes: Step S401: The temperature maintenance time is the time it takes for the indoor temperature to change from the set temperature to the warning temperature. The warning temperature is the temperature range in which the motor needs to be driven to start again to control the temperature when the indoor temperature deviates from the set temperature within a certain range; the set time threshold T 阈 If the temperature is maintained for The output selects the working mode of the drive motor to maintain the working mode command. If the temperature is maintained for a certain time Then a command is outputted to select the working mode of the driving motor as the intermittent working mode; Step S402, the maintenance working mode is to output a command to drive the motor without stopping after the indoor temperature reaches the set temperature, and reduce the power of the drive motor to a set range; the intermittent working mode is to control the drive motor to stop working after the indoor temperature reaches the set temperature, and control the drive motor to work again when the indoor temperature reaches the warning temperature.

3. The motor driving method for air conditioner according to claim 2, characterized in that: The step S500 includes: retrieving the temperature difference data corresponding to the time node in the set as the temperature difference data set 1, predicting the change trend of the outdoor temperature of the day according to the meteorological information, extracting the temperature difference data between the outdoor temperature and the indoor initial temperature as the temperature difference data set 2, extracting the time period in which the temperature difference data 2 overlaps with the temperature difference data 1 to form the temperature difference data set 3, and extracting the time period data corresponding to each temperature difference data in the temperature difference data set 3 to form a time set, if the drive motor is started within the time period included in the set, the maintenance working mode is automatically selected, and if the drive motor is not started within the time period included in the set, the intermittent working mode is selected.

4. A motor drive system applied to the motor drive method for air conditioner according to any one of claims 1 to 3, characterized in that: The motor drive system includes a temperature detection module, a data acquisition module, a data calculation module and a working mode selection module; The temperature detection module is used to detect the indoor temperature and the outdoor temperature, and calculate the temperature difference between the indoor and outdoor at each time point, and predict the change trend of the indoor temperature and the change trend of the outdoor temperature, and store the temperature value and the prediction result in the database; The data acquisition module is used to collect data on the temperature control efficiency of the driving motor in each time period, and collect and transmit the indoor and outdoor temperature difference data to the data calculation module; The data calculation module integrates and calculates the obtained data information, calculates the actual indoor heating efficiency, the heating efficiency of the driving motor, the heating consumption and the temperature maintenance time, and transmits the calculated data to the working mode selection module; The working mode selection module is used to determine the working mode that the drive motor should select based on the calculated result, and output instructions to control the drive motor to select the corresponding working mode.

5. The motor drive system for air conditioner according to claim 4, characterized in that: The temperature detection module includes an indoor temperature detection unit, an outdoor temperature detection unit, a temperature difference calculation unit and a temperature trend prediction unit. The outdoor temperature detection unit is used to detect the outdoor temperature, the indoor temperature detection unit is used to detect the indoor temperature, the temperature difference calculation unit is used to calculate the temperature difference data between indoor and outdoor, and the temperature trend prediction unit is used to predict the changing trends of the outdoor temperature and the indoor temperature respectively.

6. The motor drive system for air conditioner according to claim 4, characterized in that: The data acquisition module includes a data collection unit and a data sending unit. The data collection unit is used to collect data information required during the operation of the system, and the data sending unit is used to send the collected data information to the corresponding module.

7. The motor drive system for air conditioner according to claim 4, characterized in that: The data calculation module includes a heating efficiency calculation unit, a heating consumption calculation unit and a temperature maintenance time calculation unit. The heating efficiency calculation unit is used to calculate the actual heating efficiency in the room and the heating efficiency of the driving motor. The heating consumption calculation unit is used to calculate the power consumed in the heating process. The temperature maintenance time calculation unit is used to calculate the time for which the indoor temperature is maintained within a set temperature range.

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