Control method for calculating exhaust temperature of compressor of air conditioner

A compressor exhaust and control method technology, which is applied in heating and ventilation control systems, heating methods, space heating and ventilation, etc. Can run normally and other issues, to achieve the effect of wide application range, low production cost and flexible operation

Active Publication Date: 2012-07-11
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] Once the traditional inverter air conditioner detects the failure of the exhaust temperature sensor, it will perform shutdown protection, so that the inverter air conditioner cannot operate normally, or the exhaust temperature will be fixed at a higher temperature, so that the system can operate at a lower load. The above solutions cannot make the inverter air conditioner run at the maximum efficiency
[0004] When the traditional inverter air conditioner detects the failure of the discharge temperature sensor of the compressor, it simply detects that after the compressor has been turned on for a period of time, the system detects that the discharge temperature sensor is too low or too high. Judging the fault of the exhaust gas temperature sensor, and this method of judging the fault of the exhaust gas temperature sensor cannot judge whether the exhaust gas temperature sensor is displaced according to the position or the exhaust gas temperature sensor falls off

Method used

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  • Control method for calculating exhaust temperature of compressor of air conditioner
  • Control method for calculating exhaust temperature of compressor of air conditioner
  • Control method for calculating exhaust temperature of compressor of air conditioner

Examples

Experimental program
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Embodiment 1

[0057] see Figure 1-Figure 2 , The outdoor system of the inverter air conditioner still installs a compressor discharge temperature sensor on the discharge pipe of the compressor 3 to sample the discharge temperature of the compressor 3. Inverter air conditioner such as figure 2 As shown, temperature sensors are respectively installed on the outdoor heat exchanger 1 and the indoor heat exchanger 2, and the temperature Tc of the indoor heat exchanger and the temperature Te of the outdoor heat exchanger are detected by the sensors.

[0058] When the air conditioning system judges that the compressor discharge temperature sensor is faulty, if figure 1 As shown, follow the steps below to calculate the compressor discharge temperature based on the temperature Te of the outdoor heat exchanger and the temperature Tc of the indoor heat exchanger:

[0059] Step A, calculate the temperature correction value Tc' of the indoor heat exchanger 2 according to the detected temperature Tc ...

Embodiment 2

[0097] The difference between this embodiment and the control method of the air conditioner in Embodiment 1 is that, as Figure 5 As shown in the flow chart, since the inverter air conditioner in this embodiment can run at high frequency, step D1 is added to correct the high frequency operation of the compressor. Frequency operation correction Td=Td'+d+k×(fi-fb); fi is the current operating frequency of the compressor, fb is the reference value of the high-frequency frequency of the compressor, and the value range of fb is 70Hz~ 150Hz, k is the high-frequency operation correction coefficient of the compressor, and the value range of k is 0.05~0.3.

[0098] Judgment: When the current operating frequency fi of the compressor is greater than fb, the high-frequency operation correction of the compressor is performed; otherwise, the high-frequency operation correction of the compressor is not performed; the other calculation detailed control methods are similar to those in Embodime...

Embodiment 3

[0101] The air conditioner of this embodiment is different from the air conditioners of the above embodiments in that it adopts a control method of estimating the discharge temperature of the compressor according to the temperature of the evaporator and the temperature of the outdoor heat exchanger, and compares the calculated discharge temperature of the compressor with Compare the temperature values ​​sampled by the discharge temperature sensor. When the difference between the two temperature values ​​is relatively large, it is judged that the compressor discharge temperature sensor has fallen off or failed. The steps and implementation of the control method for estimating the compressor discharge temperature used in this embodiment Example 1 is similar, except that the calculation method in step C uses a preset curve corresponding to Tc'-Td' under different Te' to calculate the corresponding estimated value Td' of the compressor discharge temperature; as Image 6 As shown in...

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Abstract

The invention discloses a control method for calculating exhaust temperature of a compressor of an air conditioner. Temperature sensors are respectively mounted on an outdoor heat exchanger and an indoor heat exchanger and are used for detecting the outdoor heat exchanger temperature Te and the indoor heat exchange temperature Tc; the method for calculating the exhaust temperature of the compressor comprises the specific steps of: A, calculating a temperature correction value Tc' of the indoor heat exchanger according to the detected indoor heat exchanger temperature Tc and the operation frequency fi of a current compressor, wherein the Tc' is equal to Tc plus fi/a plus b, a is a frequency correction coefficient of the compressor and ranges from 5-40Hz and b is a temperature correction value of the indoor heat exchanger and ranges from -5DEG C-10DEG C; and B, calculating a temperature correction value Te' of the outdoor heat exchanger according to the detected temperature Te of the outdoor heat exchanger, wherein the Te' is equal to Te plus c. The control method has the characteristics of flexibility in operation, low manufacturing cost and wide application range.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a control method for estimating the discharge temperature of a compressor of the air conditioner. Background technique [0002] Inverter air conditioners are generally equipped with temperature sensors in the indoor and outdoor heat exchangers to detect the evaporation temperature and the temperature of the outdoor heat exchanger during the circulation of the air conditioning system, and a compressor discharge temperature sensor is also installed at the exhaust pipe of the compressor. It is used to detect the discharge temperature of the compressor when it is running, estimate the load of the compressor according to the discharge temperature of the compressor, and perform compressor frequency limit or shutdown protection according to the estimated compressor load to protect the system, and To maximize efficiency, or to detect whether the amount of refrigerant in the air conditioner system is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F11/00
Inventor 张武军滕建文梁敏游霍军亚谢李高
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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