Constant-temperature-type gas water heater control system with rapid and accurate temperature-regulating characteristic and control method

Abstract

The invention discloses a constant-temperature-type gas water heater control system and with a rapid and accurate temperature-regulating characteristic and a control method. The control system is characterized by comprising a singlechip, an ignition control loop, a flame detection loop, a fan rotation speed control loop, a gas main valve control loop, a gas proportional valve control loop, a water flow pulse signal input loop, a water temperature signal input loop of cold-hot water temperature, a fan rotation speed feedback loop, a temperature setting loop, a temperature display loop and the like, wherein the water flow pulse signal input loop, the water temperature signal input loop of cold-hot water temperature and the temperature setting loop respectively transmit the water flow rate, the actual temperatures of inlet and outlet water and the set temperature to the singlechip in real time; and a gas main valve is used for the opening and closing control of a gas passageway, a gas proportional valve is used for achieving the dual closing of the gas passageway or the flow rate regulation and temperature control, and a fan control loop is used for achieving the air volume regulation function through controlling the rotation speed of a motor. The system and the method provided by the invention aim to overcome the defect that the existing gas water heater control system and the method can not combine the temperature regulation accuracy and response speed simultaneously, and aim to provide the control system and the method with high temperature regulation accuracy and rapid temperature response.

Description

technical field [0001] The invention relates to a constant temperature gas water heater control system and a control method with fast and precise temperature regulation characteristics, which are used for fast and precise temperature regulation of the gas instant water heater. Background technique [0002] Constant-temperature gas water heaters usually use gas proportional valves to adjust the firepower and stabilize the temperature of the hot water. The gas volume required for temperature adjustment is generally controlled by PID, which can be realized by hardware or software algorithms. For example, the authorization announcement CN2218341Y relates to a water temperature adjustment control method that uses hardware circuits to realize PID control. Because the specifications of each component are determined, the PID control parameters are also constant; The control method, because the coefficients used by the algorithm are also constant parameters; according to the characte...

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Problems solved by technology

For example, the authorization announcement CN2218341Y relates to a water temperature adjustment control method that uses hardware circuits to realize PID control. Because the specifications of each component are determined, the PID control parameters are also constant; The control method, because the coefficients used by the algorithm are also constant parameters; according to the characteristics of PID adjustment, when the control parameters are constant, it is usually impossible to take into account the temperature control accuracy and response time. Generally, the temperature stability of the fast response system ( Control accuracy) is relatively poor, and the system with high temperature control accuracy has a relatively long response time

In addition, the control of the fan is usually relatively simple, only one-speed or two-speed control, and there is no full synchronous adjustment with the gas proportional valve.

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