Air conditioner

By employing a dynamic, graded frequency reduction control strategy, combined with exhaust pressure and temperature detection, the defrosting process of the air conditioner is optimized, resolving the conflict between defrosting noise and efficiency, and improving user comfort and system stability.

CN122107452APending Publication Date: 2026-05-29QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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Patent Information

Application Number
CN202610146216.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-30
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

When air conditioners are used for heating in winter, the outdoor heat exchanger frosts up, which reduces the heat exchange efficiency. Existing reverse defrosting methods are noisy and slow, affecting user comfort.

Method used

A dynamic, conditional, graded frequency reduction control strategy is adopted. By detecting the exhaust pressure and rate of change through a high-pressure sensor and combining it with the outdoor coil temperature, the compressor frequency and the opening of the electronic expansion valve are intelligently adjusted to achieve refined noise reduction control.

Benefits of technology

While ensuring effective defrosting, we simultaneously optimize defrosting efficiency and noise control to improve air conditioning comfort and user experience, and reduce refrigerant noise interference.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses an air conditioner and relates to the technical field of air conditioners. The air conditioner comprises a high-pressure pressure sensor configured to detect the exhaust pressure of a compressor; and a controller configured to periodically acquire the exhaust pressure of the compressor and the change rate thereof when the air conditioner operates in a reverse defrosting mode; determine whether the exhaust pressure reaches a first threshold P1 and the change rate reaches a first set value; if yes, control the compressor to operate at a reduced frequency and the frequency reduction amplitude is △H1; if no, when the exhaust pressure reaches a second threshold P2 and the change rate reaches a second set value, control the compressor to operate at a reduced frequency and the frequency reduction amplitude is △H2; wherein P1>P2 and △H1>△H2. By setting two different frequency reduction nodes and combining real-time judgment of the change rate of the exhaust pressure, a dynamic and conditional hierarchical frequency reduction control strategy is constructed, so that the dual optimization of defrosting efficiency and noise control is simultaneously realized under the premise of ensuring the defrosting effect.
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