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Air conditioner and its control method

A technology of air conditioning and opening degree, which is applied in heating and ventilation control systems, refrigerators, heating methods, etc., and can solve problems such as inability to prevent oscillation, complex control process, and unstable refrigeration cycle

Inactive Publication Date: 2004-08-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in the conventional configuration described above, it is impossible in principle to eliminate oscillation by controlling the expansion valve through closed loop control using the suction temperature of the compressor, which is greatly affected by the opening degree from the expansion valve.
In other words, effective at converging extreme oscillations, but not preventing certain degrees of oscillation
In addition, it takes a long time until the expansion valve is stabilized at the optimum value, and during this period, instability in the refrigeration cycle cannot be avoided, so there are problems such as the need to adopt a complicated control process.

Method used

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  • Air conditioner and its control method

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Embodiment Construction

[0022] The embodiments of the present invention will be described below with reference to the drawings.

[0023] Fig. 1 is a schematic block diagram of a control system of an air conditioner in an embodiment of the present invention. Figure 1 for and Figure 5 The same components are used with the same symbols, and their descriptions are omitted. In addition, the refrigeration cycle here is Figure 4 Have the same composition.

[0024] The indoor unit control unit 6 in FIG. 1 retrieves signals from the indoor temperature sensor 8 and others, and controls the indoor blower fan 10 and others. The indoor temperature, indoor air blowing fan speed information, and other necessary information are output from the indoor control unit 6 to the outdoor unit control unit 71.

[0025] The outdoor control unit 71 uses the indoor temperature and other data output from the indoor control unit 6 and the outdoor temperature sensor installed on the outdoor unit and other signals to control the comp...

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Abstract

To determine the proper throttle amount without performing the feedback control, and to stabilize a refrigerating cycle in controlling an electronic expansion valve of an air conditioner. The optimum throttle valve opening to maximize the evaporator heat exchanging efficiency is calculated in a calculation block 71 on the basis of a calculating formula determined in advance by the experiment on the basis of an indoor temperature, an outdoor temperature, an indoor fan speed and a rotating frequency of a compressor 1, to control the electronic expansion valve 5.

Description

Technical field [0001] The invention relates to a method for controlling the opening degree of an electronic expansion valve constituting a refrigeration cycle of an inverter type air conditioner and an air conditioner using the method. Background technique [0002] Generally, air-conditioning consists of Figure 4 The shown compressor 1, four-way valve 2, indoor heat exchanger 3, outdoor heat exchanger 4 and electronic expansion valve 5 constitute a refrigeration cycle. During the cooling operation of this air conditioner, the four-way valve 2 is controlled so that the cooling medium flows back to the room in the order of the compressor 1, the outdoor heat exchanger 4, and the electronic expansion valve 5 from the indoor heat exchanger 3 as shown by the dotted arrow. Heat exchanger 3. In this way, the indoor heat exchanger 3 acts as an evaporator to absorb surrounding heat. On the other hand, the rotation of the indoor fan is controlled according to the air volume set by the rem...

Claims

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Application Information

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IPC IPC(8): F24F11/02F25B1/00F25B49/02
CPCY02B30/741F25B2600/021Y02B30/70
Inventor 山田吉人大泷镇雄
Owner PANASONIC CORP
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