Air conditioning system, refrigerant amount estimation method for air conditioning system, air conditioner, and refrigerant amount estimation method for air conditioner

By utilizing the communication system between the air conditioner and the server, and employing multiple regression analysis and judgment models, the problem of the estimation accuracy of refrigerant dosage in multi-split air conditioners being affected by other faults was solved, achieving higher estimation accuracy.

CN116997757BActive Publication Date: 2026-07-14FUJITSU GENERAL LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FUJITSU GENERAL LTD
Filing Date
2022-02-24
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing technologies for estimating the amount of refrigerant in multi-split air conditioners are easily affected by malfunctions other than refrigerant leakage, leading to a decrease in estimation accuracy.

Method used

A communication system between the air conditioner and the server is adopted. The state variables of the refrigerant circuit are obtained through the detection unit. A multivariate regression analysis is used to generate an inference model. Combined with the judgment model of the judgment unit, the inference accuracy is improved.

Benefits of technology

Even when the characteristic quantity is affected by other faults, it can improve the estimation accuracy of the refrigerant dosage and ensure the accuracy of the estimation results.

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Abstract

An air conditioning system has an air conditioner having a refrigerant circuit in which a prescribed amount of refrigerant is filled, the refrigerant circuit being configured by connecting an outdoor unit and at least one indoor unit by a refrigerant pipe, and a server communicatively connected to the air conditioner. The air conditioner has a first communication section that detects a state quantity related to control of the air conditioner, acquires a detected detection value, and transmits the acquired detection value to the server. The server has a second communication section for receiving the detection value from the air conditioner, an estimation section that estimates a residual refrigerant amount remaining in the refrigerant circuit using the detection value of a first characteristic quantity when a state quantity related to the amount of refrigerant filled in the refrigerant circuit is the first characteristic quantity, and a determination section for determining whether the detection value of the first characteristic quantity is a detection value that should be used in estimation of the residual refrigerant amount. As a result, even in the case where the characteristic quantity used to estimate the residual refrigerant amount is affected by other failures, it is possible to improve the estimation accuracy of the residual refrigerant amount.
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Citation Information

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