Control method and control apparatus for multi-split air conditioning system, and multi-split air conditioning system

Abstract

Provided in the present disclosure are a control method and apparatus for a multi-split air conditioning system, and a multi-split air conditioning system and a storage medium. The control method comprises: in a heating startup stage, acquiring an indoor environment temperature of a space where operating indoor units are located and an evaporator tube temperature of all the operating indoor units (S110); and when it is determined, according to the indoor environment temperature and the evaporator tube temperature of all the operating indoor units, that the current startup state of the multi-split air conditioning system is a warm-startup state, controlling fans of the operating indoor units to operate at a first-level set windshield, wherein the first-level set windshield is the highest-level windshield among a plurality of levels of set windshields (S120).

What is claimed is: 
     
         1 . A control method of a multi-split air conditioning system, wherein the multi-split air conditioning system comprises an outdoor unit and a plurality of indoor units, and at least one of the plurality of indoor units is an operating indoor unit in a running state; and the control method comprises:
 obtaining, in a heating-start stage, an indoor environment temperature of a space where the operating indoor units are located and a temperature of an evaporator tube of each of the operating indoor units; and   controlling a fan of each of the operating indoor units to run at a first set fan speed in response to determining that the current startup state of the multi-split air conditioning system is a warm-startup state based on the indoor environment temperature and the temperature of the evaporator tube of each of the operating indoor units, wherein the first set fan speed is the highest fan speed in a plurality of set fan speeds.   
     
     
         2 . The control method according to  claim 1 , further comprising:
 controlling a compressor of the outdoor unit to run for a first set time at a first platform frequency in response to determining that the current startup state of the multi-split air conditioning system is the warm-startup state; and   controlling the compressor to run at a set frequency after the compressor runs for the first set time, wherein the first platform frequency is greater than the set frequency.   
     
     
         3 . The control method according to  claim 2 , further comprising:
 controlling the compressor to run for a second set time at a second platform frequency in response to determining that the current startup state of the multi-split air conditioning system is a cold-startup state based on the indoor environment temperature and the temperature of the evaporator tube of each of the operating indoor units, wherein the second platform frequency is greater than the first platform frequency and the second set time is longer than the first set time; and   controlling the compressor to run at the set frequency after the compressor runs for the second set time, wherein the second platform frequency is greater than the set frequency.   
     
     
         4 . The control method according to  claim 1 , further comprising:
 controlling the fans of the operating indoor units to enter an anti-cold wind mode in response to determining that the current startup state of the multi-split air conditioning system is a cold-startup state; and   exiting the anti-cold wind mode and controlling the fans of the operating indoor units to run at the first set fan speed in response to the temperatures of the evaporator tubes of the operating indoor units being greater than the first set temperature, wherein the first set fan speed is the highest fan speed in the plurality of set fan speeds.   
     
     
         5 . The control method according to  claim 1 or 4 , further comprising:
 controlling a running fan speed of the fan to switch from the first set fan speed to the second set fan speed when a preset condition is met,   wherein the preset condition comprises at least one of:   a time for which the fan run at the first set fan speed is greater than a third set time;   a time during which the temperatures of the evaporator tubes of the operating indoor units have been within a preset temperature range is longer than a fourth set time.   
     
     
         6 . The control method according to  claim 2 or 3 , after controlling the compressor to run at a set frequency, further comprising:
 calculating an average temperature of the tubes based on the temperature of the evaporator tube of each of the operating indoor units; and   adjusting a running frequency of the compressor based on the average temperature of the tubes.   
     
     
         7 . The control method according to  claim 6 , wherein adjusting the running frequency of the compressor based on the average temperature of the tubes comprises:
 increasing the running frequency of the compressor in response to the average temperature of the tubes being less than a difference between a second set temperature and a first set value; and   reducing the running frequency of the compressor in response to the average temperature of the tubes being greater than a sum of the second set temperature and the first set value.   
     
     
         8 . The control method according to  claim 1 , further comprising:
 controlling the multi-split air conditioning system to enter an overheat trip shutdown assistance mode to assist in reducing a pressure of the multi-split air conditioning system through the standby indoor units or the outdoor unit in response to at least one of the plurality of indoor units being a standby indoor unit in a standby state, and the temperatures of the evaporator tubes of the operating indoor units being greater than a difference between a set shutdown temperature and a second set value.   
     
     
         9 . The control method according to  claim 8 , further comprising:
 determining the environmental state of the space where the standby indoor units are located when the multi-split air conditioning system enters the overheat trip shutdown assistance mode, wherein the environmental state comprises a space-occupied state and a space-unoccupied state; and   controlling the fans of the standby indoor units to run at a third set fan speed in response to determining that the standby indoor units are in the space-unoccupied state, wherein the third set fan speed is the highest fan speed in the plurality of set fan speeds.   
     
     
         10 . The control method according to  claim 9 , wherein the outdoor unit comprises a plurality of electronic expansion valves corresponding to the indoor units, and after the multi-split air conditioning system enters the overheat trip shutdown assistance mode, the control method further comprises:
 adjusting an opening degree of each of the electronic expansion valves corresponding to the standby indoor units based on the temperatures of the evaporator tubes of the operating indoor units in response to all the standby indoor units being in a space-occupied state.   
     
     
         11 . The control method according to  claim 10 , wherein adjusting an opening degree of each of the electronic expansion valves corresponding to the standby indoor units based on the temperatures of the evaporator tubes of the operating indoor units comprises:
 increasing the opening degree of each of the electronic expansion valves corresponding to the standby indoor units in response to the temperatures of the evaporator tubes of the operating indoor units being greater than the difference between the set shutdown temperature and the second set value; and   reducing the opening degree of each of the electronic expansion valves corresponding to the standby indoor units in response to the temperatures of the evaporator tubes of the operating indoor units being less than the difference between the set shutdown temperature and the second set value.   
     
     
         12 . The control method according to  claim 1 , wherein determining that the current startup state of the multi-split air conditioning system is a warm-startup state based on the indoor environment temperature and the temperature of the evaporator tube of each of the operating indoor units comprises:
 calculating an average temperature of the tubes based on the temperature of the evaporator tube of each of the operating indoor units; and   determining that the current startup state of the multi-split air conditioning system is a warm-startup state in response to a difference between the average temperature of the tubes and the indoor environment temperature being greater than a third set temperature; and   wherein the control method further comprises:   determining that the current startup state of the multi-split air conditioning system is a cold-startup state in response to the difference between the average temperature of the tubes and the indoor environment temperature being less than or equal to the third set temperature.   
     
     
         13 . The control method according to  claim 1 , before obtaining the indoor environment temperature of a space where the operating indoor units are located and the temperature of the evaporator tube of each of the operating indoor units, further comprising:
 obtaining an outdoor environment temperature;   obtaining a first capacity of each of the operating indoor units and a second capacity of the outdoor unit in response to the outdoor environment temperature being greater than a fourth set temperature;   calculating a sum of the capacities of the operating indoor units based on the first capacities of all the operating indoor units; and   determining that the multi-split air conditioning system has an overheat trip shutdown risk based on the second capacity and the sum of the capacities of the operating indoor units.   
     
     
         14 . The control method according to  claim 13 , wherein determining that the multi-split air conditioning system has the overheat trip shutdown risk based on the second capacity and the sum of the capacities of the operating indoor units comprises:
 determining that the multi-split air conditioning system has the overheat trip shutdown risk in response to the sum of the capacities of the operating indoor units being less than a product of the second capacity and a third set value.   
     
     
         15 . A running control device, comprising at least one control processor and a memory configured to be in communication connection with the at least one control processor, wherein the memory stores instructions that are capable of being executed by the at least one control processor, and the instructions, when executed by the at least one control processor, cause the at least one control processor to execute the control method according to any one of  claims 1 to 14 . 
     
     
         16 . A multi-split air conditioning system, comprising the running control device according to  claim 15 . 
     
     
         17 . A computer-readable storage medium storing computer-executable instructions configured to cause a computer to execute the control method according to any one of  claims 1 to 14 .