Self-adaptive control method for wind pressure system of gas water heater

Abstract

The invention discloses a self-adaptive control method for a wind pressure system of a gas water heater. The maximum virtual pressure value Pmax and the minimum virtual pressure value Pmin are determined according to the whole machine rated load of a gas water heater and the formula P=R / M*K, wherein the maximum virtual pressure value Pmax and the minimum virtual pressure value Pmin correspond to the maximum rotating speed FH and the minimum rotating speed FL of a fan respectively; according to the maximum virtual pressure value Pmax, the minimum virtual pressure value Pmin and the current of aproportional valve, a curve is determined; according to the curve and the formula, the actual pressure value P and the target pressure value P are determined, and the difference between the actual pressure value P and the target pressure value P serves as a control deviation Err; and self-adaptive compensation is realized by adjusting the control deviation Err to approach zero. The method guarantees that the system air volume can be self-adaptively adjusted under different using conditions to meet the performance requirement of a whole machine. Meanwhile, a protection function can be timely started under the severe limit condition, and the problem that an internal system is damaged or safety accidents are caused is avoided.

Description

technical field [0001] The invention belongs to the technical field of gas water heaters, and in particular relates to an adaptive control method for a wind pressure system of a gas water heater. Background technique [0002] There are mainly two control methods for the system air volume compensation of the existing gas water heaters using DC fans: [0003] 1. Through the wind pressure sensing module, the corresponding wind volume compensation is made for the monitoring of the wind pressure value at the fixed-point pressure taking position; [0004] 2. The system monitors the fan current in real time, and realizes the air volume compensation through the control of the current. [0005] The first method is affected by factors such as the accuracy drift of the wind pressure sensing module, the consistency and accuracy of the pressure location, and other factors, often causing false or no wind pressure failure reports. [0006] However, the second method is difficult to achie...

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Problems solved by technology

[0005] The first method is affected by factors such as the accuracy drift of the wind pressure sensing module, the consistency and accuracy of the pressure location, and other factors, often causing false or no wind pressure failure reports.

[0006] However, the second method is difficult to achieve good matching characteristics in the full load section of the system, and there are often false or no reports of wind pressure failures;

[0007] It can be seen that the emergence of problematic points in the existing control methods will cause bad experience for users, and when deeper defects appear, the system may fail and cause safety accidents.

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