Control method and control system of electric water heater with multi-mode intelligent control function

Abstract

The invention relates to the technical field of electric water heaters, and discloses an electric water heater control method with a multi-mode intelligent control function, which is characterized by comprising the following steps of: starting and electrifying a system, receiving real-time feedback of an inner container temperature probe, and controlling a display screen to display the real-time water temperature T1 of an inner container; receiving a selected power heating mode instruction, wherein the power heating mode instruction is one of an economic mode, an intelligent mode and a night electricity mode; and calling a corresponding temperature difference judgment logic and a power control strategy according to the selected mode. According to the control method of the electric water heater with the multi-mode intelligent control function, the corresponding temperature difference judgment logic and the power control strategy can be called according to the power heating mode instruction selected by the user, the heating strategy of the electric water heater is flexibly adjusted, accurate heating control is achieved, the diversified water use requirements of the user are met, and meanwhile the user experience is improved. Energy-saving operation of the electric water heater is achieved, the energy efficiency and the use experience can be improved, and remarkable economic benefits and social benefits are achieved.

Description

Technical Field

[0001] This invention relates to the field of electric water heater technology, and in particular to a control method and control system for an electric water heater with multi-mode intelligent control function. Background Technology

[0002] Traditional electric water heaters have a relatively simple control method, typically only providing basic heating and heat preservation functions. They cannot be flexibly adjusted according to actual user needs and different usage scenarios. This leads to energy waste during operation and makes it difficult to meet diverse user water needs. For example, when user water consumption is low, they still heat at a fixed power, resulting in unnecessary energy consumption; and during nighttime hours when electricity prices are lower, they fail to take full advantage of lower electricity prices for centralized heating.

[0003] Chinese patent application CN201821078615.6 discloses an electric water heater, including an inner tank, a mounting bracket, a heating device, and a control display device. The inner tank comprises a main body, an inlet, a water outlet, and a pressure relief valve. First, the inner tank is fixed in its installation position using the mounting bracket, and the inlet, outlet, and drain pipes are connected as specified. When the water heater is needed, cold water is first introduced into the cavity of the inner tank through the inlet. As the water volume approaches the full volume of the cavity, the pressure of the air inside gradually increases due to the reduced cavity volume. When the pressure of the gas inside the cavity reaches the pressure relief valve's threshold, the valve opens, expelling the air from the cavity. The water level gauge is observed; when the cavity is full, water is stopped being introduced. The maximum heating temperature of the water inside the cavity is adjusted as needed on the control display device. The heating controller controls the heater located at the inlet to heat the water inside the cavity. The temperature monitor synchronously monitors the water temperature inside the cavity and displays the monitored temperature value on the display device. After the water inside the cavity is heated to the specified temperature, the heating controller controls the heater to stop heating the water inside the cavity. After the heater is powered off, the insulation layer on the inner wall of the inner tank body can maintain the water temperature inside the cavity. If the power is not powered off, when the temperature monitor detects a drop in the water temperature inside the cavity, it will control the heater to heat the water inside the cavity through the heating controller. When showering, the shower pipe is turned on, and hot water flows out through the outlet. At this time, cold water is injected into the cavity through the inlet, causing the hot water above the cavity to continuously flow out. After the cold water enters the cavity and mixes with the hot water, the water temperature will drop. When the temperature monitor detects the water temperature change, it will notify the heating controller, and the heating controller will control the heater to heat the water inside the cavity, thus increasing the output of hot water. In addition, when the hot water flowing out of the shower pipe is too hot, the cold water pipe can be turned on to introduce cold water into the mixer body to mix and create a comfortable water temperature.

[0004] However, this electric water heater is basically the same as traditional electric water heaters, with a relatively simple control method. It usually only has simple heating and heat preservation functions and cannot be flexibly adjusted according to the actual needs of users and different usage scenarios. This leads to energy waste during the operation of the electric water heater and makes it difficult to meet the diverse water needs of users. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of the prior art and provide a control method for an electric water heater with multi-mode intelligent control function, as well as a control system for an electric water heater with multi-mode intelligent control function for implementing the control method.

[0006] To achieve the above objectives, the present invention adopts the following solution: A control method for an electric water heater with multi-mode intelligent control function includes the following steps: When the system is powered on, it receives real-time feedback from the inner tank temperature probe and controls the display screen to show the real-time water temperature T1 of the inner tank. Receive a selected power heating mode command, wherein the power heating mode command is one of economy mode, smart mode, and night mode; The corresponding temperature difference judgment logic and power control strategy are invoked based on the selected mode.

[0007] Furthermore, the specific steps for invoking the corresponding temperature difference judgment logic and power control strategy based on the selected mode are as follows: When the selected mode is the economic mode, The heating module is controlled to operate according to the set power level; wherein, the set power level includes a low power level, a medium power level, and a high power level, with the power increasing sequentially. Determine if Ta ≥ △T1; where Ta = T01 - T1, T01 is the set water temperature of the inner tank, Ta is the real-time temperature difference, and △T1 is the set temperature difference; If so, control the inner liner heating module to work until T1=T01; If not, the inner heating module will stop working and output a heat preservation status. When the selected mode is Smart Mode, Determine if Tb≥2*△T2, where Tb=T02-T1, T02 is the set water temperature of the inner tank, Tb is the real-time temperature difference, and △T2 is the set temperature difference; If so, control the inner liner heating module to work at the high power level until T1 = T02; If not, then determine that Tb≥△T2; If so, control the inner liner heating module to work at the medium power level until T1 = T02; If not, the inner heating module will stop working and output a heat preservation status. When the selected mode is night mode, Determine if Tc ≥ △T3; where Tc = T03 - T1, T01 is the set water temperature of the inner tank, Tc is the real-time temperature difference, and △T3 is the set temperature difference; If so, the inner tank heating module will be controlled to work at a high power level during the preset nighttime period; and the inner tank heating module will be controlled to work at a low power level during the preset daytime period, until T1=T03. If not, the inner liner heating module will stop working and output a heat preservation status.

[0008] Furthermore, the low-level power setting, the medium-level power setting, and the high-level power setting are 1000W, 1500W, and 2500W, respectively.

[0009] Furthermore, the inner tank water temperature settings include: Upon initial system startup, the default inner tank water temperature setting is 60℃. or, When the selected mode is the economy mode, the user sets the water temperature of the inner tank through the operation control panel. The water temperature setting range T01 is 30-75℃. When the selected mode is intelligent mode, the user sets the water temperature of the inner tank through the operation control panel. The water temperature setting range for the inner tank, T02, is 30-75℃. When the selected mode is night mode, the user can set the water temperature of the inner tank through the operation control panel. The water temperature setting range for the inner tank, T03, is 30-75℃.

[0010] Furthermore, the set temperature difference ΔT1 is 5-10℃; the set temperature difference ΔT2 is 5-10℃; the set temperature difference ΔT3 is 5-10℃; The preset nighttime period is from 23:00 to 7:00 the next day; the preset daytime period is from 7:00 to 23:00.

[0011] Furthermore, △T1 is a set temperature difference of 5℃; △T2 is a set temperature difference of 5℃; and △T3 is a set temperature difference of 5℃.

[0012] Furthermore, the electric water heater control method with multi-mode intelligent control function also includes: Upon receiving the water pump start-up command, determine whether the real-time water temperature T1 in the inner tank is greater than 40℃. If so, in economic mode and smart mode, the water pump starts and operates according to the set operating mode; in night power mode, the water pump starts and operates according to the set operating mode during the time periods of 5:30-7:00 and 17:30-21:00. Otherwise, the water pump will not work.

[0013] Furthermore, the electric water heater control method with multi-mode intelligent control function also includes: Upon receiving the antifreeze mode command, when the real-time water temperature T1 of the inner tank is detected to be less than or equal to 8℃, the system enters the antifreeze state and automatically controls the heating module to start heating to 45℃. When the real-time water temperature T1 of the inner tank is detected to be greater than or equal to 45℃, the antifreeze mode is deactivated.

[0014] This invention also provides a control system for an electric water heater with multi-mode intelligent control function, used to implement the above-described control method for an electric water heater with multi-mode intelligent control function, comprising: Inner liner body; An inner heating module is located within the inner liner body; A water pump, which is connected to the outlet of the inner tank body; Inner tank temperature probe, which is used to detect the water temperature of the inner tank body; The control panel and display screen are electrically connected to the inner tank heating module, water pump, inner tank temperature probe and display screen respectively.

[0015] Furthermore, the control panel includes a control panel, a power switch, a water pump button, a function selection button, an up button, a down button, a first power indicator light, a second power indicator light, an economy indicator light, a smart indicator light, and a night mode indicator light; the control panel is electrically connected to the inner tank heating module, the water pump, the inner tank temperature probe, the display screen, the power switch, the water pump button, the function selection button, the up button, the down button, the first power indicator light, the second power indicator light, the economy mode indicator light, the smart mode indicator light, and the night mode indicator light.

[0016] Furthermore, the electric water heater control system with multi-mode intelligent control function also includes a Wi-Fi module for connecting to a mobile APP; the Wi-Fi module is electrically connected to the control panel.

[0017] Compared with existing technologies, the present invention has the following advantages: 1. The electric water heater control method with multi-mode intelligent control function of the present invention has three power heating modes: economic mode, intelligent mode and night mode. The method can call the corresponding temperature difference judgment logic and power control strategy according to the different power heating mode commands selected by the user, flexibly adjust the heating strategy of the electric water heater, realize precise heating control, meet the diverse water use needs of users, realize the energy-saving operation of the electric water heater, and thus help improve energy efficiency and user experience, with significant economic and social benefits.

[0018] 2. The present invention also uses an independently controlled water pump to draw the cold water remaining in the hot water pipes of the electric water heater back into the inner tank, reheat it, and then send it back to the hot water pipes of the electric water heater, so that the water in the hot water pipes is always hot, achieving instant hot water. The system also has multiple protection functions such as antifreeze, antibacterial, and fault self-diagnosis, improving the safety and reliability of the product. Attached Figure Description

[0019] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a flowchart illustrating the electric water heater control method with multi-mode intelligent control function according to the present invention.

[0021] Figure 2 This is a schematic diagram of the control panel, display screen, and Wi-Fi module of the present invention.

[0022] Figure 3 This is an electrical connection diagram of the inner tank heating module, water pump, inner tank temperature probe, control panel, display screen, and Wi-Fi module of the electric water heater control system with multi-mode intelligent control function of the present invention.

[0023] The image includes: 1. Inner tank heating module; 2. Water pump; 3. Inner tank temperature probe; 4. Control panel; 41. Control panel; 42. Switch button; 43. Water pump button; 44. Function selection button; 45. Up button; 46. Down button; 47. First power indicator light; 48. Second power indicator light; 49. Economy indicator light; 410. Smart indicator light; 411. Night power indicator light; 5. Display screen; 6. WiFi module. Detailed Implementation

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] like Figures 1 to 3As shown, this invention also provides a control system for an electric water heater with multi-mode intelligent control function, used to implement the aforementioned control method for an electric water heater with multi-mode intelligent control function. The system includes an inner tank body, an inner tank heating module 1, a water pump 2, an inner tank temperature probe 3, a control panel 4, and a display screen 5. The inner tank body stores water for providing hot water; the inner tank body is a common structure in existing electric water heaters and is not shown in the attached diagram. The inner tank heating module 1 is located within the inner tank body; specifically, the inner tank heating module 1 is a conventional electric heating element with a conventional structure and is not shown in the attached diagram. The purpose of the water pump 2 is to pump residual cold water in the hot water pipes of the electric water heater back into the inner tank body, reheat it, and then return it to the hot water pipes, ensuring that the water in the hot water pipes is always hot, achieving instant hot water, avoiding the use of cold water, and eliminating the waiting and waste of cold water, greatly improving the user experience. The inner tank temperature probe 3 is used to detect the water temperature of the inner tank body; the control panel 4 is electrically connected to the inner tank heating module 1, the water pump 2, the inner tank temperature probe 3 and the display screen 5 respectively.

[0026] This multi-mode intelligent control system for electric water heaters combines an inner tank, an inner tank heating module 1, a water pump 2, an inner tank temperature probe 3, a control panel 4, and a display screen 5. This facilitates multi-mode intelligent control of the water heater. Through advanced algorithms, it enables the application of three power heating modes: economy mode, intelligent mode, and night mode, allowing for intelligent switching and coordination of multiple operating modes to meet diverse needs such as energy saving, rapid heating, comfort, and economy. The control system also uses an independently controlled water pump 2 to pump residual cold water in the hot water pipes back into the inner tank, reheat it, and then return it to the hot water pipes, ensuring the water in the pipes is always hot for instant hot water. The control system also features multiple protection functions such as antifreeze, antibacterial, and fault self-diagnosis, enhancing product safety and reliability. The antibacterial and fault self-diagnosis functions are existing features, essentially the same as in existing electric water heaters, and their steps are not described in detail.

[0027] In this embodiment, the control panel 4 includes a control panel 41, a switch button 42, a water pump button 43, a function selection button 44, an up button 45, a down button 46, a first power indicator light 47, a second power indicator light 48, an economy indicator light 49, a smart indicator light 410, and a night mode indicator light 411. The control panel 41 is electrically connected to the inner tank heating module 1, the water pump 2, the inner tank temperature probe 3, the display screen 5, the switch button 42, the water pump button 43, the function selection button 44, the up button 45, the down button 46, the first power indicator light 47, the second power indicator light 48, the economy mode indicator light, the smart mode indicator light, and the night mode indicator light. The switch button 42 has a power-on / off function. The water pump button 43 is associated with the operating status of water pump 2 and is indicated by "PUMP". The water pump button 43 has a dual-color light, displaying white and red respectively. When the water pump button 43 is white, it means that water pump 2 is turned on but not working; when it is red, it means that water pump 2 is working. The water pump 2 function can be turned on / off by pressing and holding the button 43 for 5 seconds. The function selection button 44 is used for power selection and mode switching, and is used in conjunction with the up button 45 and the down button 46. Pressing and holding the function selection button 44 for 3 seconds switches between operating modes such as economy mode, smart mode, and night mode. In economy mode, a short press of the function selection button 44 cycles between low power levels (1000W), medium power levels (1500W), and high power levels (2500W). The display screen 5 is an LED digital dot matrix display screen. After 3 minutes of inactivity, the brightness of the display screen 5 decreases by 50% to save energy. Both the first power indicator light 47 and the second power indicator light 48 are dual-color lights, including a heating indicator light and a heat preservation indicator light. At the corresponding power level, when the heating indicator light is on (e.g., red), it indicates that the inner liner heating module 1 is heating at this power. When the heat preservation indicator light is on (e.g., white), it indicates that the inner liner heating module 1 is in a heat preservation state and awaiting heating, and also provides a power selection prompt. Specifically, the first power indicator light 47 is a 1000W power light, and the second power indicator light 48 is a 1500W power light. When the first power indicator light 47 is on, it indicates that the heating power of the heating module 6 is 1000W. Specifically, when the first power indicator light 47 is in heat preservation state, it is white, and the second power indicator light 48 is off; when the first power indicator light 47 is in heating state, it is red, and the second power indicator light 48 is off. When the second power indicator light 48 is lit, it indicates that the heating power of the heating module 6 is 1500W. Specifically, in the heat preservation state, the second power indicator light 48 is white, and the first power indicator light 47 is off; in the heating state, the second power indicator light 48 is red, and the first power indicator light 47 is off. When both the first power indicator light 47 and the second power indicator light 48 are lit, it indicates that the heating power of the heating module 6 is 2500W.Specifically, the first power indicator 47 and the second power indicator 48 both light up white when in heat preservation mode; and both light up red when in heating mode. For the three modes—Economy Mode, Smart Mode, and Night Mode—when the Economy indicator 49 is lit, it indicates that the user has selected Economy Mode, denoted by "ECO"; when the Smart indicator 410 is lit, it indicates that the user has selected Smart Mode, denoted by "SMART"; and when the Economy indicator 49 is lit, it indicates that the user has selected Night Mode, denoted by "NIGHT". In addition to the three modes mentioned above, in another embodiment, the electric water heater control system with multi-mode intelligent control function is also combined with an external heat source system to form an external heat source heating mode, which can also be named water tank mode. Specifically, the inner tank heating module 1 stops working and relies solely on the external heat source system to generate heat from the external heat source. The high-temperature hot water produced by the external heat source is circulated through an external pump and heat exchanged through the heat exchange coil inside the inner tank body to achieve the purpose of heating, thereby achieving the effect of heat energy exchange and realizing the external heat source heating the water in the inner tank body.

[0028] The electric water heater control system with multi-mode intelligent control also includes a Wi-Fi module 6 for connecting to a mobile app; the Wi-Fi module 6 is electrically connected to the control panel 41. Users can control the water heater's on / off function, temperature adjustment, and heating power mode switching anytime, anywhere via the mobile app, without manual operation. For example, the water heater can be turned on in advance on the way home, so hot water is available upon arrival.

[0029] A control method for an electric water heater with multi-mode intelligent control function, implemented using the aforementioned electric water heater control system with multi-mode intelligent control function, comprises the following steps: When the system is powered on, it receives real-time feedback from the inner tank temperature probe 3 and controls the display screen 5 to display the real-time water temperature T1 of the inner tank.

[0030] Receive a selected power heating mode command, wherein the power heating mode command is one of economy mode, smart mode, and night mode; The selected mode triggers the corresponding temperature difference judgment logic and power control strategy. Specifically, when the selected mode is the economy mode: The heating module 6 operates according to a set power level. The set power levels include a low power level, a medium power level, and a high power level, arranged sequentially from low to high. The set power level is determined manually by the user operating the control panel 4, and is selected from these three levels: 1000W, 1500W, and 2500W.

[0031] Determine if Ta ≥ △T1; where Ta = T01 - T1, T01 is the set water temperature of the inner tank, Ta is the real-time temperature difference, and △T1 is the set temperature difference; the set water temperature T01 of the inner tank can be automatically set to 60℃ upon initial system startup, or it can be selected within the range of 30-75℃. The set temperature difference △T1 is 5-10℃, preferably 5℃.

[0032] If so, control the inner liner heating module 1 to work until T1=T01; If not, the inner heating module 1 will stop working and output a heat preservation status. When the selected mode is Smart Mode, The determination is made that Tb ≥ 2 * ΔT2, where Tb = T02 - T1, T02 is the set water temperature of the inner tank, Tb is the real-time temperature difference, and ΔT2 is the set temperature difference. The set water temperature of the inner tank, T02, can be automatically set to 60℃ upon initial system startup, or it can be selected from a range of 30-75℃. The set temperature difference ΔT2 is 5-10℃, preferably 5℃.

[0033] If so, control the inner liner heating module 1 to work at the high power level until T1 = T02; If not, then determine that Tb≥△T2; If so, control the inner liner heating module 1 to work at the medium power level until T1 = T02; If not, the inner heating module 1 will stop working and output a heat preservation status. When the selected mode is night mode, Determine if Tc ≥ △T3; where Tc = T03 - T1, T01 is the set water temperature of the inner tank, Tc is the real-time temperature difference, and △T3 is the set temperature difference; the set water temperature of the inner tank T03 can be the default set water temperature of 60℃ upon initial system startup, or it can be selected within the range of 30-75℃. The set temperature difference △T3 is 5-10℃, preferably 5℃.

[0034] If so, the inner liner heating module 1 will be controlled to operate at a high power level during the preset nighttime period; and the inner liner heating module 1 will be controlled to operate at a low power level during the preset daytime period, until T1=T03; wherein, the preset nighttime period is 23:00-7:00 the next day; and the preset daytime period is 7:00-23:00.

[0035] If not, the inner liner heating module 1 will stop working and output a heat preservation status.

[0036] This multi-mode intelligent control method for electric water heaters features three power heating modes: economy mode, intelligent mode, and night mode. Based on the user's selected power heating mode command, the method invokes the corresponding temperature difference judgment logic and power control strategy to flexibly adjust the water heater's heating strategy, achieving precise heating control. This meets diverse user water needs while enabling energy-efficient operation of the water heater, thereby improving energy efficiency and user experience, resulting in significant economic and social benefits.

[0037] This control method for electric water heaters with multi-mode intelligent control functions also includes: Upon receiving the water pump 2 start mode command, determine whether the real-time water temperature T1 in the inner tank is greater than 40℃. If so, in economic mode and smart mode, water pump 2 starts and operates according to the set operating mode; in night power mode, water pump 2 starts and operates according to the set operating mode during the time periods of 5:30-7:00 and 17:30-21:00. If not, water pump 2 will not work.

[0038] Specifically, in the operation of water pump 2, after water pump 2 is activated, a short press of water pump button 43 enters the water pump 2 working mode selection. Display screen 5 will display the last selected working mode according to memory and flash for 3 seconds. A short press of the up button 45 or the down button 46 selects between OF / ON / 2 / 3 / 4. The selected value will start flashing on display screen 5 for 3 seconds. If there is no further operation after 3 seconds, it will be automatically confirmed and exited. "ON" means continuous operation, "4" means 4 working cycles per hour, each cycle is 15 minutes, water pump 2 operation mode is 5 minutes running and 10 minutes stopping, "3" means 3 working cycles per hour, each cycle is 20 minutes, water pump 2 operation mode is 5 minutes running and 15 minutes stopping, "2" means 2 working cycles per hour, each cycle is 30 minutes, water pump 2 operation mode is 5 minutes running and 25 minutes stopping, OF means not working.

[0039] This multi-mode intelligent control method for electric water heaters uses an independently controlled water pump 2 to draw residual cold water from the hot water pipes back into the inner tank, reheat it, and then return it to the hot water pipes. This ensures that the water in the hot water pipes is always hot, providing instant hot water and avoiding the need for users to use cold water, as well as the waiting and waste of cold water, greatly improving the user experience.

[0040] This control method for electric water heaters with multi-mode intelligent control functions also includes: Upon receiving the antifreeze mode command, when the real-time water temperature T1 of the inner tank is detected to be less than or equal to 8℃, the antifreeze mode is entered, and the heating module 6 is automatically controlled to start heating to 45℃. When the real-time water temperature T1 of the inner tank is detected to be greater than or equal to 45℃, the antifreeze mode is deactivated.

[0041] This electric water heater control method with multi-mode intelligent control function can enable the electric water heater control system to have antifreeze protection function, thereby improving product safety and reliability.

[0042] In summary, the embodiments of the present invention provide a control method and control system for an electric water heater with multi-mode intelligent control function, wherein the control method and control system for the electric water heater with multi-mode intelligent control function have the following advantages: I. The control method for electric water heaters with multi-mode intelligent control has three power heating modes: economy mode, intelligent mode, and night mode. This method can call the corresponding temperature difference judgment logic and power control strategy according to the different power heating mode commands selected by the user, flexibly adjust the heating strategy of the electric water heater, and achieve precise heating control. While meeting the diverse water needs of users, it also realizes the energy-saving operation of the electric water heater, thereby helping to improve energy efficiency and user experience, and has significant economic and social benefits.

[0043] Second, through an independently controlled water pump 2, the residual cold water in the hot water pipes of the electric water heater is drawn back into the inner tank, reheated, and then sent back to the hot water pipes of the electric water heater, so that the water in the hot water pipes is always hot, achieving instant hot water; the system also has multiple protection functions such as antifreeze, antibacterial, and fault self-diagnosis, improving the safety and reliability of the product.

[0044] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A control method for an electric water heater with multi-mode intelligent control function, characterized in that, It includes the following steps: When the system is powered on, it receives real-time feedback from the inner tank temperature probe and controls the display screen to show the real-time water temperature T1 of the inner tank. Receive a selected power heating mode command, wherein the power heating mode command is one of economy mode, smart mode, and night mode; The corresponding temperature difference judgment logic and power control strategy are invoked based on the selected mode.

2. The electric water heater control method with multi-mode intelligent control function according to claim 1, characterized in that, The specific steps for invoking the corresponding temperature difference judgment logic and power control strategy based on the selected mode are as follows: When the selected mode is the economic mode, The heating module is controlled to operate according to the set power level; wherein, the set power level includes a low power level, a medium power level and a high power level, with the power increasing sequentially. Determine if Ta ≥ △T1; where Ta = T01 - T1, T01 is the set water temperature of the inner tank, Ta is the real-time temperature difference, and △T1 is the set temperature difference; If so, control the inner liner heating module to work until T1=T01; If not, the inner heating module will stop working and output a heat preservation status. When the selected mode is Smart Mode, Determine if Tb≥2*△T2, where Tb=T02-T1, T02 is the set water temperature of the inner tank, Tb is the real-time temperature difference, and △T2 is the set temperature difference; If so, control the inner liner heating module to work at the high power level until T1 = T02; If not, then determine that Tb≥△T2; If so, control the inner liner heating module to work at the medium power level until T1 = T02; If not, the inner heating module will stop working and output a heat preservation status. When the selected mode is Night Power mode, Determine if Tc ≥ △T3; where Tc = T03 - T1, T01 is the set water temperature of the inner tank, Tc is the real-time temperature difference, and △T3 is the set temperature difference; If so, the inner tank heating module will be controlled to work at a high power level during the preset nighttime period; and the inner tank heating module will be controlled to work at a low power level during the preset daytime period, until T1=T03. If not, the inner liner heating module will stop working and output a heat preservation status.

3. The electric water heater control method with multi-mode intelligent control function according to claim 2, characterized in that, The low-level power setting, medium-level power setting, and high-level power setting are 1000W, 1500W, and 2500W, respectively.

4. The electric water heater control method with multi-mode intelligent control function according to claim 2, characterized in that, The inner tank water temperature settings include: Upon initial system startup, the default inner tank water temperature setting is 60℃. or, When the selected mode is the economy mode, the user sets the water temperature of the inner tank through the operation control panel. The water temperature setting range T01 is 30-75℃. When the selected mode is intelligent mode, the user sets the water temperature of the inner tank through the operation control panel. The water temperature setting range for the inner tank, T02, is 30-75℃. When the selected mode is night mode, the user can set the water temperature of the inner tank through the operation control panel. The water temperature setting range for the inner tank, T03, is 30-75℃.

5. The electric water heater control method with multi-mode intelligent control function according to claim 2, characterized in that, The set temperature difference ΔT1 is 5-10℃; the set temperature difference ΔT2 is 5-10℃; the set temperature difference ΔT3 is 5-10℃; The preset nighttime period is from 23:00 to 7:00 the next day; the preset daytime period is from 7:00 to 23:

00.

6. The electric water heater control method with multi-mode intelligent control function according to claim 5, characterized in that, The set temperature difference is 5℃ for △T1; the set temperature difference is 5℃ for △T2; and the set temperature difference is 5℃ for △T3.

7. The electric water heater control method with multi-mode intelligent control function according to claim 2, characterized in that, Also includes: Upon receiving the water pump start-up command, determine whether the real-time water temperature T1 in the inner tank is greater than 40℃. If so, in economic mode and smart mode, the water pump starts and operates according to the set operating mode; in night power mode, the water pump starts and operates according to the set operating mode during the time periods of 5:30-7:00 and 17:30-21:

00. Otherwise, the water pump will not work.

8. The electric water heater control method with multi-mode intelligent control function according to claim 2, characterized in that, Also includes: Upon receiving the antifreeze mode command, when the real-time water temperature T1 of the inner tank is detected to be less than or equal to 8℃, the system enters the antifreeze state and automatically controls the heating module to start heating to 45℃. When the real-time water temperature T1 of the inner tank is detected to be greater than or equal to 45℃, the antifreeze mode is deactivated.

9. A control system for an electric water heater with multi-mode intelligent control function, characterized in that, The method for controlling an electric water heater with multi-mode intelligent control function according to any one of claims 1 to 8 includes: Inner liner body; An inner heating module is located within the inner liner body; A water pump, which is connected to the outlet of the inner tank body; Inner tank temperature probe, which is used to detect the water temperature of the inner tank body; The control panel and display screen are electrically connected to the inner tank heating module, water pump, inner tank temperature probe and display screen respectively.

10. The electric water heater control system with multi-mode intelligent control function according to claim 9, characterized in that, The control panel includes a control panel, a power switch, a water pump button, a function selection button, an up button, a down button, a first power indicator light, a second power indicator light, an economy indicator light, a smart indicator light, and a night mode indicator light. The control panel is electrically connected to the inner tank heating module, the water pump, the inner tank temperature probe, the display screen, the power switch, the water pump button, the function selection button, the up button, the down button, the first power indicator light, the second power indicator light, the economy mode indicator light, the smart mode indicator light, and the night mode indicator light. The electric water heater control system with multi-mode intelligent control function also includes a Wi-Fi module for connecting to a mobile APP; the Wi-Fi module is electrically connected to the control panel.

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