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A load self-adaptive control method and system during closed-loop start-up of a variable frequency controller

A frequency conversion controller and control method technology, applied in heating and ventilation control systems, heating and ventilation safety systems, mechanical equipment, etc., can solve problems such as compressor out-of-step, start-up failure, etc.

Active Publication Date: 2021-09-28
HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the closed-loop start-up method has a certain improvement in the start-up success rate under heavy load, the frequency increase rate of the closed-loop start-up is generally fixed. If the load of the system changes greatly, sometimes the load is small, and sometimes it is very large. If the frequency increase rate is too high, it may cause the compressor to lose synchronization and fail to start.

Method used

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  • A load self-adaptive control method and system during closed-loop start-up of a variable frequency controller
  • A load self-adaptive control method and system during closed-loop start-up of a variable frequency controller
  • A load self-adaptive control method and system during closed-loop start-up of a variable frequency controller

Examples

Experimental program
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no. 1 example

[0046] see Figure 1-4 , a control method for load self-adaptation when a variable frequency controller is started in a closed loop, comprising:

[0047] S101. Detect the actual load of the refrigeration system; wherein, the actual load is the pressure difference between the pressure value of the high pressure side and the pressure value of the low pressure side of the refrigeration system, and the actual load and the frequency increase rate of starting the frequency conversion controller meet the preset linear relationship.

[0048] S102. According to the preset linear relationship, start the frequency conversion controller according to the up-frequency rate corresponding to the actual load.

[0049] Such as figure 2 As shown, in a specific embodiment, before the variable frequency controller is started, the microprocessor first detects the actual load of the refrigeration system. Through the pressure detection circuit, the pressure value of the high pressure side and the...

no. 2 example

[0061] see Figure 5 , On the basis of the above embodiments, preferably, the control method includes:

[0062] S201. Detect the actual load of the refrigeration system; wherein, the actual load is the pressure difference between the pressure value of the high pressure side and the pressure value of the low pressure side of the refrigeration system, and the actual load and the frequency increase rate of starting the frequency conversion controller meet the preset linear relationship.

[0063] S202. When the actual load is greater than the preset maximum load, start the compressor to preheat, and when the actual load drops to the preset maximum load or below, corresponding to the actual load at this time The up-frequency rate, start the frequency conversion controller.

[0064] When the microprocessor calculates the actual load ΔP, ΔP max max , stop preheating. Entering the starting state according to the frequency increase rate corresponding to the load at this time can re...

no. 3 example

[0066] see Figure 6 , a control system for load self-adaptation when the variable frequency controller is closed-loop started, including:

[0067] The detection module 10 is used to detect the actual load of the refrigeration system; wherein, the actual load is the pressure difference between the high-pressure side pressure value and the low-pressure side pressure value of the refrigeration system, and the actual load is related to the frequency increase rate for starting the frequency conversion controller Satisfy the preset linear relationship;

[0068] The up-frequency rate determination module 20 is configured to start the frequency conversion controller according to the up-frequency rate corresponding to the actual load according to the preset linear relationship.

[0069] Such as figure 2 As shown, in a specific embodiment, before the variable frequency controller is started, the microprocessor first detects the actual load of the refrigeration system. Through the p...

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Abstract

The invention discloses a load self-adaptive control method when the frequency conversion controller is closed-loop started, comprising: detecting the actual load of the refrigeration system; wherein, the actual load is the pressure value of the high-pressure side and the low-pressure side of the refrigeration system difference, the actual load and the frequency up rate of starting the frequency conversion controller meet a preset linear relationship; according to the preset linear relationship, the frequency conversion controller is started according to the frequency up rate corresponding to the actual load. According to the teaching of the above embodiments, the present invention can start the complete machine efficiently and reliably. The invention also provides a load self-adaptive control system and an air conditioner when the frequency conversion controller is started in a closed loop.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control, in particular to a load adaptive control method and system when a frequency conversion controller is started in a closed loop. Background technique [0002] Inverter air conditioners, inverter washing machines, and inverter refrigerators all use inverter controllers for closed-loop start-up. However, how to start reliably when the load of the whole machine is different has become the focus of current research. [0003] Take the inverter air conditioner as an example: [0004] The inverter air conditioner is in a low-temperature environment for a long time, and the refrigerant in the system will be deposited in the compressor. When the power is turned on for the first time, the load inside the compressor is very large. Usually, the positioning open-loop to closed-loop control method is adopted. After heating for several hours, or even more than ten hours, the system load can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F11/64F24F11/70F24F140/50
CPCF24F11/64F24F11/70F24F2140/50
Inventor 牟宗娥岳元龙安丰德高思云
Owner HISENSE (SHANDONG) AIR CONDITIONING CO LTD