Constant temperature control method and device for water heater and water heater

Abstract

The invention discloses a constant temperature control method and device for a water heater and the water heater. The method comprises the steps of obtaining operation parameters of the water heater; determining a real-time power theoretical value at the sampling moment according to the operation parameters; establishing a water temperature control mathematical model based on an energy conservation principle; determining a position type PID control model and a lag compensation model according to water flow parameters and the water temperature control mathematical model; processing a temperature difference value between the set temperature and the outlet water temperature based on the position type PID control model and the lag compensation model, and obtaining a power control output value; determining a target power value according to the power control output value and the real-time power theoretical value; and driving a heating module to execute heating according to the target power value. According to the method, through establishment of the water temperature control mathematical model, the PID control model and the lag compensation model are obtained through derivation, the heating target power value is obtained by combining the PID control model and the lag compensation model with the real-time power theoretical value, the stability and robustness of the outlet water temperature are improved, and the response time is shortened.

Description

technical field [0001] The invention relates to the technical field of water heater heating control, in particular to a water heater constant temperature control method, device and water heater. Background technique [0002] An instant water heater is a device that rapidly heats flowing water through an electronic heating device. The instant water heater has the advantages of maintaining a constant temperature of the outlet water and fast heating speed, and is widely used in daily washing, bathing and other scenarios. [0003] The key to affecting the water outlet performance of instant water heaters is the constant temperature calculation. After the temperature difference between the water outlet temperature and the set temperature occurs, use the constant temperature algorithm to correct the temperature difference and ensure that the correction effect can continue. [0004] The existing water heater constant temperature algorithm usually directly adopts logic calculation o...

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Problems solved by technology

[0005] The invention provides a water heater constant temperature control method, which solves the problems of slow response speed and poor constant temperature effect of the existing constant temperature control algorithm to water temperature changes, and is conducive to increasing the adjustment response speed and improving the constant temperature effect

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