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A self-adaptive method for step-by-step control of a frequency conversion external unit and an air conditioner

A hierarchical control and self-adaptive technology, applied in heating and ventilation control systems, applications, heating methods, etc., can solve problems such as poor heat exchange of evaporators, high system pressure, and overload protection of air conditioners.

Active Publication Date: 2020-07-07
NINGBO AUX ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When the external unit of the existing air conditioner is running, there will be load protection shutdown. However, in actual situations, the protection shutdown of the air conditioner can be divided into many reasons. One part is the failure of the air conditioner itself, and the other may be the air conditioner It is caused by external reasons, but in the traditional control logic, when the air conditioner has a protection shutdown, it will adopt a unified processing method. When the protection shutdown occurs, it will repeatedly protect the shutdown until a certain number of times the air conditioner reports a fault, so that the air conditioner cannot be used.
[0003] However, when the installation scene of the external unit of the existing air conditioner is limited, the installation is not standardized or the evaporator accumulates dirt, etc., the heat exchange of the evaporator of the external unit of the air conditioner is poor, which causes the high pressure of the system to be too high, which will also cause the air conditioner to malfunction. Overload protection shutdown, and for the protection shutdown caused by such external conditions, it is often unreasonable to use direct protection shutdown to report failures

Method used

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  • A self-adaptive method for step-by-step control of a frequency conversion external unit and an air conditioner
  • A self-adaptive method for step-by-step control of a frequency conversion external unit and an air conditioner
  • A self-adaptive method for step-by-step control of a frequency conversion external unit and an air conditioner

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Embodiment 1

[0040] Such as figure 1 with 2 As shown, the present invention proposes a self-adaptive method for hierarchical control of variable frequency external units, including the following steps:

[0041] S1. When the frequency conversion external unit has a protection shutdown, determine whether the compressor operation data before the protection shutdown meets the preset conditions;

[0042] S2. When the operating data of the compressor meets the preset conditions, determine the ambient temperature T of the outdoor unit 1 Whether it is above the preset value A of the outdoor high temperature;

[0043] S3, when T 1 ≥A, the frequency conversion outdoor unit starts the self-adaptive mode of frequency reduction.

[0044] Compressor operating data includes compressor pressure H 0 , Compressor discharge pipe temperature T 0 and compressor current I 0 ; Preset conditions include H 0 ≥H max and T 0 max or I 0 >I max and T 0 max ;

[0045] Among them, H max is the preset valu...

Embodiment 2

[0056] The difference of this embodiment is that, in step S3, when T 1 ≥A, the frequency conversion external unit starts the frequency reduction adaptive mode, and the frequency conversion external machine starts the frequency reduction self-adaptive mode, which specifically includes:

[0057] Read compressor frequency F before protection shutdown 0 ;

[0058] Exit the protection shutdown and restart the frequency conversion external unit;

[0059] The compressor is graded and calculated to obtain the frequency F after frequency reduction;

[0060] Carry out frequency modulation according to the frequency F, so that the compressor performs frequency-down operation.

[0061] In this embodiment, when determining the ambient temperature T of the outdoor unit 1 When ≥A, read the compressor frequency F before the protection shutdown 0 ; Exit the protection shutdown, and restart the frequency conversion external unit; the compressor performs classification calculation, set the ...

Embodiment 3

[0065] Like the above-mentioned self-adaptive method of step-by-step control of frequency conversion external units, the difference of this embodiment is that after the compressor performs down-frequency operation, the external units of the air conditioner and the air conditioner resume operation. At this time, if the protection shutdown occurs again, restart Ambient temperature T of the external machine 1 The determination, and the frequency reduction operation of the compressor again, until the external unit of the air conditioner can be in a stable and continuous operation state.

[0066] In the step-by-step calculation of the compressor, after obtaining the frequency F after frequency modulation, it also includes: combining the frequency F with the lowest frequency value F min comparing.

[0067] Among them, the lowest frequency value F min It can be determined according to the actual situation, and is not limited here.

[0068] When judging Fmin , the frequency convers...

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Abstract

The invention provides a variable frequency outdoor unit hierarchical control self-adaption method and an air conditioner. The method comprises the steps of 1, when protective halt of a variable frequency outdoor unit occurs, judging whether operating data, formed before protective halt, of a compressor meet preset conditions or not; 2, when the operating data of the compressor meet the preset conditions, judging whether the environment temperature T1 of the outdoor unit is higher than an outdoor high-temperature preset value A or not; and 3, when T1 is greater than or equal to A, starting a frequency reduction self-adaption mode of the variable frequency outdoor unit. By means of the variable frequency outdoor unit hierarchical control self-adaption method and the air conditioner, when protective halt, caused by external reasons, of the variable frequency outdoor unit occurs and the external environment temperature is excessively high, the frequency reduction self-adaption mode is started for the variable frequency outdoor unit, so that the compressor operates at the reduced frequency; the refrigeration capacity and the heating capacity can be lowered, and low-energy-efficiency operation is achieved; and compared with the mode that fault is directly reported to stop operation of the air conditioner, the method is more reasonable, and the comfort level and the experience levelof users are raised to the greatest extent.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a self-adaptive method for hierarchical control of frequency conversion external units and an air conditioner. Background technique [0002] When the external unit of the existing air conditioner is running, there will be load protection shutdown. However, in actual situations, the protection shutdown of the air conditioner can be divided into many reasons. One part is the failure of the air conditioner itself, and the other may be the air conditioner It is caused by external reasons, but in the traditional control logic, when the air conditioner has a protection shutdown, it will adopt a unified processing method. When the protection shutdown occurs, it will repeatedly protect the shutdown until a certain number of times the air conditioner reports a fault, so that the air conditioner cannot be used. [0003] However, when the installation scene of the external unit of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/64F24F11/65F24F11/88
CPCF24F11/64F24F11/65F24F11/88
Inventor 张伟强刘世勇范孙操朱文超李小斌王炉军
Owner NINGBO AUX ELECTRIC
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