Method for controlling water heater, water heater and storage medium

Abstract

A method for controlling a water heater includes determining that the water heater is in a minimum load operation state; in accordance with a determination that the water heater is in the minimum load operation state; detecting an outlet water temperature of the water heater, determining that the outlet water temperature meets a preset condition; and in accordance with a determination that the outlet water temperature meets the preset condition, controlling the water heater to stop heating.

What is claimed is: 
     
         1 . A method for controlling a water heater comprising:
 determining that the water heater is in a minimum load operation state;   in accordance with a determination that the water heater is in the minimum load operation state, detecting an outlet water temperature of the water heater;   determining that the outlet water temperature meets a preset condition; and   in accordance with a determination that the outlet water temperature meets the preset condition, controlling the water heater to stop heating.   
     
     
         2 . The method according to  claim 1 , wherein the preset condition includes that:
 the outlet water temperature is greater than a set temperature of the water heater, and   a temperature difference value between the outlet water temperature and the set temperature is not less than a temperature difference threshold.   
     
     
         3 . The method according to  claim 2 , wherein the preset condition further includes that a change value of the outlet water temperature is less than a preset value. 
     
     
         4 . The method according to  claim 1 ,
 wherein the preset condition is a first preset condition;   the method further comprising, after controlling the water heater to stop heating:   determining that the outlet water temperature of the water heater drops to meet a second preset condition; and   in accordance with a determination that the outlet water temperature of the water heater drops to meet the second preset condition, controlling the water heater to start heating.   
     
     
         5 . The method according to  claim 4 , wherein the second preset condition includes at least one of following conditions:
 a current outlet water temperature of the water heater is greater than a set temperature of the water heater, and a temperature difference value between the current outlet water temperature and the set temperature of the water heater is not greater than a temperature difference threshold; and   a time duration during which the water heater stops heating is not less than a target time duration.   
     
     
         6 . The method according to  claim 5 , wherein the target time duration is negatively correlated with an inlet water flow rate of the water heater. 
     
     
         7 . The method according to  claim 5 , further comprising, before controlling the water heater to start heating:
 obtaining a number of times that the water heater stops heating in the minimum load operation state, and/or a change value of the outlet water temperature of the water heater during a last period of heating cessation, and/or an ambient temperature corresponding to the water heater; and   determining the temperature difference threshold based on the number of times and/or the change value of the outlet water temperature and/or the ambient temperature.   
     
     
         8 . The method for controlling the water heater according to  claim 7 , wherein determining the temperature difference threshold includes:
 obtaining a target correspondence among the number of times, the change value of the outlet water temperature, and the temperature difference threshold according to the ambient temperature; and   determining the temperature difference threshold corresponding to the number of times and the change value of the outlet water temperature according to the target correspondence.   
     
     
         9 . The method according to  claim 4 , further comprising, after controlling the water heater to stop heating:
 controlling the water heater to maintain a water-in and water-out state.   
     
     
         10 . The method according to  claim 4 , wherein controlling the water heater to start heating includes:
 obtaining:
 a change rate of the outlet water temperature after the water heater stops heating, and 
 a temperature difference value between a current outlet water temperature of the water heater and a set temperature of the water heater; 
   adjusting a current inlet water flow rate of the water heater according to the temperature difference value and the change rate; and   controlling the water heater to start heating.   
     
     
         11 . The method according to  claim 4 , further comprising, after controlling the water heater to start heating:
 detecting again the outlet water temperature of the water heater in accordance with a determination that the water heater is in the minimum load operation state.   
     
     
         12 . The method according to  claim 1 , further comprising, after controlling the water heater to stop heating:
 controlling a fan in a combustion chamber of the water heater to operate at a revolving speed not greater than a preset revolving speed to discharge smoke in the combustion chamber until the water heater starts heating.   
     
     
         13 . A water heater comprising:
 at least one processor; and   at least one memory storing at least one control program that, when executed by the at least one processor, causes the at least one processor to:
 in accordance with a determination that the water heater is in a minimum load operation state, detect an outlet water temperature of the water heater; and 
 in accordance with a determination that the outlet water temperature meets a preset condition, control the water heater to stop heating. 
   
     
     
         14 . The water heater according to  claim 13 , wherein the preset condition includes that:
 the outlet water temperature is greater than a set temperature of the water heater, and   a temperature difference value between the outlet water temperature and the set temperature is not less than a temperature difference threshold.   
     
     
         15 . The water heater according to  claim 14 , wherein the preset condition further includes that a change value of the outlet water temperature is less than a preset value. 
     
     
         16 . The water heater according to  claim 13 , wherein:
 the preset condition is a first preset condition; and   the at least one memory storing at least one control program, when executed by the at least one processor, further causes the at least one processor to, after controlling the water heater to stop heating:
 determine that the outlet water temperature of the water heater drops to meet a second preset condition; and 
 in accordance with a determination that the outlet water temperature of the water heater drops to meet the second preset condition, control the water heater to start heating. 
   
     
     
         17 . The water heater according to  claim 16 , wherein the second preset condition includes at least one of following conditions:
 a current outlet water temperature of the water heater is greater than a set temperature of the water heater, and a temperature difference value between the current outlet water temperature and the set temperature of the water heater is not greater than a temperature difference threshold; and   a time duration during which the water heater stops heating is not less than a target time duration.   
     
     
         18 . The water heater according to  claim 17 , wherein the target time duration is negatively correlated with an inlet water flow rate of the water heater. 
     
     
         19 . The method according to  claim 17 , wherein the at least one memory storing at least one control program, when executed by the at least one processor, further causes the at least one processor to, before controlling the water heater to start heating:
 obtain a number of times that the water heater stops heating in the minimum load operation state, and/or a change value of the outlet water temperature of the water heater during a last period of heating cessation, and/or an ambient temperature corresponding to the water heater; and   determine the temperature difference threshold based on the number of times and/or the change value of the outlet water temperature and/or the ambient temperature.   
     
     
         20 . A non-transitory computer-readable storage medium storing at least one control program that, when executed by at least one processor, causes the at least one processor to:
 in accordance with a determination that a water heater is in a minimum load operation state, detect an outlet water temperature of the water heater; and   in accordance with a determination that the outlet water temperature meets a preset condition, control the water heater to stop heating.