Defrosting control method of air-conditioner

Abstract

The invention discloses a novel judging method of defrosting conditions of an air-conditioner, which cancels an environment temperature sensor and judges if an outdoor heat exchanger needs to be defrosted according to the temperature variation situation of an outdoor evaporator in the heating process, thereby simplifying the design and a manufacturing method of products, reducing the development cost and enhancing the heating efficiency of the air-conditioner. The defrosting control method is as follows: after the air-conditioner is started to carry out heating operation, a control device records an initial value of the temperature of the outdoor heat exchanger and then dynamically records and judges a temperature signal of the outdoor heat exchanger, which is sent by a pipe temperature sensor of the outdoor heat exchanger, so as to obtain a maximum value Tmax of the temperature of the outdoor heat exchanger and store the maximum value Tmax; after the cumulative time of the heating operation of the air-conditioner reaches a preset time quantum of the control device, the control device compares the current temperature T of the outdoor heat exchanger with the maximum value Tmax of the temperature of the outdoor heat exchanger, and when the Tmax-T is larger than or equal to M which is the set temperature, the air-conditioner is in a defrosting mode.

Description

technical field [0001] The invention belongs to the technical field of automatic control, and in particular relates to a defrosting control method of an air conditioner. Background technique [0002] Existing air-conditioning products need to perform defrosting operation during heating in winter, and the defrosting operation control method usually requires the use of an external ambient temperature sensor to assist in completion. For example: [0003] Notification number is the Chinese patent of CN1548864, title is: " defrost control method of air conditioner ", discloses a kind of defrost control method of air conditioner. It includes the stage of making the refrigerant enter the outdoor heat exchanger after the compressor is driven; the stage of measuring the outdoor air temperature and the temperature of the outdoor exhaust pipe after a certain period of time; and defrosting when the temperature difference between the outdoor air and the outdoor exhaust pipe exceeds a ce...

AI Technical Summary

Problems solved by technology

Therefore, for air-conditioning products, the routing of the external ambient temperature sensor, electrical safety issues, and detection accuracy issues must be considered during the design and development process, which imposes some restrictions on development and increases the complexity of product design and manufacturing.

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