Gas water heater and constant temperature control method and device thereof

Abstract

The invention discloses a constant temperature control method of a gas water heater, comprising the following steps: detecting the inlet water temperature and the inlet water flow rate of the gas water heater; The heat load required to heat the temperature to the preset temperature; adjust the current of the proportional valve of the gas water heater according to the heat load and the initial adjustment rule so that the outlet water temperature of the gas water heater reaches the preset temperature; when the outlet water temperature reaches the preset temperature, the gas The current proportional valve current and the current heat load of the water heater; the initial adjustment rule is updated according to the current proportional valve current and the current heat load, so as to adjust the current of the proportional valve according to the updated adjustment rule. The constant temperature control method can reduce the start-up overshoot of the gas water heater, shorten the start-up constant temperature time, and further improve the constant temperature performance of the gas water heater. The invention also provides a constant temperature control device for a gas water heater and a gas water heater.

Description

technical field [0001] The invention relates to the technical field of gas water heaters, in particular to a constant temperature control method for a gas water heater, a constant temperature control device for a gas water heater and a gas water heater. Background technique [0002] In related technologies, most of the constant temperature control of gas water heaters adopts the PID (Proportion Integral Derivative, proportional integral derivative) algorithm, but the PID algorithm is only accurate in the control of the linear system, and the control of the nonlinear system and the hysteresis system is prone to overshoot and overshoot. Since the gas water heater is a lagging system, the constant temperature time is relatively long (generally 40-60 seconds), the outlet water temperature fluctuates greatly (generally 2-3°C), and the temperature overshoot is high (generally 2-3°C). Contents of the invention [0003] The present invention aims to solve one of the technical prob...

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Problems solved by technology

[0002] In related technologies, most of the constant temperature control of gas water heaters adopts the PID (Proportion Integral Derivative, proportional integral derivative) algorithm, but the PID algorithm is only accurate in the control of the linear system, and it is easy to produce overshoot and overshoot in the control of the nonlinear system and the hysteresis system.

Since the gas water heater is a lagging system, the constant temperature time is relatively long (generally 40-60 seconds), the outlet water temperature fluctuates greatly (generally 2-3°C), and the temperature overshoot is high (generally 2-3°C)

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