Control method of indoor fan of air conditioner, control device and air conditioner

Abstract

The present application provides a control method and a control device of an indoor fan of an air conditioner, and an air conditioner. When the air conditioner operates in a cooling mode, when an indoor temperature reaches a set temperature, and it is detected that the number of times of frequent start-stop of a compressor is greater than or equal to the set number of times within a set time, it is determined that the air conditioner enters an operating stage of maintaining an indoor set temperature, and the compressor is no longer controlled to start and stop, but the indoor fan is controlled to operate in reverse at different rotational speeds based on different coil temperatures Tz of an indoor heat exchanger, an air volume output by the indoor fan is less than an air volume output when the indoor fan operates in forward.

What is claimed is: 
     
         1 . A control method of an indoor fan of an air conditioner, the air conditioner including a compressor, an indoor heat exchanger, and the indoor fan, the control method comprising:
 an air conditioner operation mode determination step of determining whether the air conditioner is working in a predetermined mode;   an indoor return air temperature detection step of detecting an indoor return air temperature T 1  in real time;   an indoor return air temperature comparison step of comparing the indoor return air temperature T 1  detected in real time with an air conditioner set target temperature T S ;   a compressor working state detection step of detecting in real time and recording a current working state of the compressor;   an indoor heat exchanger coil temperature detection step of detecting in real time and recording a coil temperature T z  of the indoor heat exchanger;   an indoor fan reverse instruction generation step of generating an indoor fan reverse instruction based on a detection result in the compressor working state detection step, the coil temperature T z  of the indoor heat exchanger, and a comparison result in the indoor return air temperature comparison step; and   an indoor fan reverse instruction execution step of executing, by the indoor fan, an indoor fan reverse operation based on the indoor fan reverse instruction.   
     
     
         2 . The control method of an indoor fan of an air conditioner according to  claim 1 , wherein
 in the indoor fan reverse instruction generation step, an indoor fan reverse instruction for instructing the indoor fan to operate in reverse at different rotational speeds is generated based on different coil temperatures T z  of the indoor heat exchanger.   
     
     
         3 . The control method of an indoor fan of an air conditioner according to  claim 2 , wherein
 in the indoor fan reverse instruction execution step,   when the coil temperature T z  of the indoor heat exchanger is higher than a first set temperature T 0  but lower than a second set temperature T 21 , the indoor fan is controlled to operate in reverse at a first set rotational speed;   when the coil temperature T z  of the indoor heat exchanger is higher than the second set temperature T 21  but lower than a third set temperature T 22 , the indoor fan is controlled to operate in reverse at a second set rotational speed; and   when the coil temperature T z  of the indoor heat exchanger is higher than the third set temperature T 22  but lower than a fourth set temperature T 2 , the indoor fan is controlled to operate in reverse at a third set rotational speed.   
     
     
         4 . The control method of an indoor fan of an air conditioner according to  claim 3 , wherein
 the first set rotational speed is less than the second set rotational speed, and less than the third set rotational speed.   
     
     
         5 . The control method of an indoor fan of an air conditioner according to  claim 4 , wherein
 the first set temperature T 0  is a fixed preset value, and   the fourth set temperature T 2  is the coil temperature T z  of the indoor heat exchanger when the indoor return air temperature T 1  is less than or equal to the air conditioner set target temperature T S .   
     
     
         6 . The control method of an indoor fan of an air conditioner according to  claim 5 , wherein
 the second set temperature T 21  and the third set temperature T 22  are obtained by interpolation between the first set temperature T 0  and the fourth set temperature T 2 .   
     
     
         7 . The control method of the indoor fan of the air conditioner according to  claim 1 , wherein the predetermined mode is that the air conditioner operates in a cooling mode. 
     
     
         8 . The control method of an indoor fan of an air conditioner according to  claim 7 , the control method further comprising: an electrostatic dust removal mode operation step, wherein an electrostatic dust removal mode is operated after the indoor fan reverse instruction is generated in the indoor fan reverse instruction generation step. 
     
     
         9 . The control method of an indoor fan of an air conditioner according to  claim 8 , the control method further comprising:
 an indoor fan reverse exit instruction step of instructing the indoor fan to exit reverse operation when the indoor return air temperature T 1  and the air conditioner set target temperature T S  satisfy a numerical relational expression T 1 −T S ≥n,   where n is a fixed preset value.   
     
     
         10 . A control device of an indoor fan of an air conditioner, the control device comprising:
 an air conditioner operation mode determination module configured to determine whether the air conditioner is working in a predetermined mode;   a compressor working state detection module configured to detect in real time and record a current working state of a compressor;   an indoor heat exchanger coil temperature detection module configured to detect in real time and record a coil temperature T z  of an indoor heat exchanger;   an indoor return air temperature detection module configured to detect an indoor return air temperature T 1  in real time;   an indoor return air temperature comparison module configured to compare the indoor return air temperature T 1  detected in real time with an air conditioner set target temperature T S ;   an indoor fan reverse instruction generation module configured to generate an indoor fan reverse instruction based on a comparison result of the compressor working state detection module, the coil temperature T z  of the indoor heat exchanger, and a comparison result of the indoor return air temperature comparison module; and   an indoor fan reverse instruction execution module configured to execute, by the indoor fan, an indoor fan reverse operation based on the indoor fan reverse instruction.   
     
     
         11 . An air conditioner comprising: a memory and a control device, wherein the control device executes the control method of an indoor fan of an air conditioner according to  claim 1 . 
     
     
         12 . A control method of an indoor fan of an air conditioner, the air conditioner including a compressor, an indoor heat exchanger, and the indoor fan, the control method comprising:
 an indoor fan reverse instruction generation module configured to generate an indoor fan reverse instruction based on a comparison result of a current working state of the compressor, a coil temperature T z  of the indoor heat exchanger, and an indoor return air temperature; and   an indoor fan reverse instruction execution module configured to execute, by the indoor fan, an indoor fan reverse operation based on the indoor fan reverse instruction.