Expansion valve control method for multiple type airconditioner

A control method and technology for air conditioners, applied in refrigerators, heating and ventilation control systems, compressors, etc., to solve problems such as inaccessibility, inability to exert capacity, and large load changes
CN1705852AInactive Publication Date: 2005-12-07PANASONIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PANASONIC CORP
Publication Date
2005-12-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

During a cooling or dehumidifying operation, the initial pulse of an expansion valve is set according to the difference between an indoor temperature and an indoor temperature setting, a refrigerant degree of superheat is calculated from an indoor heat-exchanger temperature and a refrigerant outlet temperature, a positive, zero or negative correction pulse is set according to the difference between a calculated refrigerant degree of superheat and a target refrigerant degree of superheat, and the opening of an indoor expansion valve is controlled according to a corrected pulse obtained by adding a correction pulse to the initial pulse. Later, a correction pulse is repeatedly set at specified intervals, upper-limit and lower-limit pulses are set, and a corrected pulse is set appropriately to the upper-limit pulse or the lower-limit pulse when a corrected pulse is higher than the upper-limit pulse or lower than the lower-limit pulse.
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Description

technical field

[0001] The invention relates to an expansion valve control method of a multi-standard air conditioner in which multiple indoor units are connected to one outdoor unit. Background technique

[0002] In the conventional multi-system air conditioner, the temperature of the indoor heat exchanger and the outlet temperature of the indoor heat exchanger are detected, and the degree of superheat of the refrigerant is calculated from the temperature difference, and the target value of the degree of superheat of the refrigerant is set, and the opening degree of the expansion valve is corrected. Thus, the calculated refrigerant superheat converges to the target value. (For example, refer to Patent Document 1)

[0003] Patent Document 1: Japanese Unexamined Patent Publication No. 2-17358

[0004] However, in the conventional structure described above, in order to rapidly approach the target degree of superheat, if the pulse value of primary correction is increased, the...

Claims

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