JPH04155138A - Controller of air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to operation control for creating a comfortable living environment by controlling indoor humidity during dehumidification operation of an air conditioner. Air Conditioning W11L During dehumidification operation, the operating frequency of the compressor and the rotation speed of the indoor fan motor are controlled.Also, the relative humidity control only controls the operation stoppage of the compressor.The problem that the invention aims to solve.With conventional control, the load It is extremely difficult to set the operating frequency of the compressor and the throttle opening of the pulse expansion valve to correspond to When the relative humidity is high, the refrigerating capacity becomes larger than the load, resulting in repeated shutdowns of the compressor.The present invention is intended to solve the above problems, as indoor humidity cannot be comfortably controlled. The purpose of this is to optimally control the low operating frequency continuous operation (low capacity operation) of the compressor and the operation of the pulse type expansion valve depending on the load such as indoor air relative humidity. In order to solve this problem, the present invention utilizes a compressor capable of continuous low-frequency operation, a variable throttling pulse type expansion valve, and an indoor fan motor. The present invention also works by setting the upper and lower limits of the throttle opening of the pulse type expansion valve according to the operating frequency, and ultimately changing the rotational speed of the indoor fan motor from that during normal cooling operation. Compressor low operating frequency (
In other words, by setting the optimal throttle opening range for both indoor and outdoor loads (in other words, at low capacity), the rotation speed of the indoor fan motor can be quickly and optimally set for both indoor and outdoor loads. By lowering the temperature of the indoor heat exchanger, the dehumidifying capacity can be increased to the maximum by lowering the temperature of the indoor heat exchanger, and the absolute humidity inside the room can be lowered. In other words, one embodiment of the present invention is made possible to create a comfortable living environment. As shown in the figure, when an instruction for cooling or dehumidifying operation is given by the remote control or forced operation (step 101), the indoor fan, outdoor fan, and compressor of the air conditioner are operated. begins (step 102). At the same time, the comparison means 3 compares the indoor suction temperature Tin sampled by the indoor suction temperature detection means 1 with the specified indoor suction temperature Ta determined by the indoor suction temperature setting means 2 (step 103). Judgment is made at t (if the indoor suction temperature Tin is lower than the specified indoor suction temperature Ta (T
in<=Ta), the dehumidifying operation is started (step 104
). At the same time as the dehumidifying operation is started in step 104, the indoor fan speed switching means 24 and the output means 25 reduce the indoor fan speed compared to the cooling operation. In other words, at this stage, the indoor air volume is reduced (step 105). ). Also, at the same time as step 105 above, the operating frequency of the compressor is changed to a lower frequency (step 1
06).

Next, the indoor relative humidity is determined by comparing the indoor relative humidity Win sampled by the indoor relative humidity detecting means 5 with the specified indoor relative humidity Wa determined by the indoor relative humidity setting means 6 by the comparing means 7 (step 107). ＼ When the indoor relative humidity Win exceeds Wa, the operating frequency setting means 14 sets the operating frequency Hzl, and the output means 16
Frequency switching means 21 and output means 22
The operating frequency of the compressor is changed (step 108). Further, if the indoor relative humidity W in is lower than Wa in step 107, the comparison means 7 compares the specified indoor relative humidity wb set by the indoor relative humidity setting means 6 again (step 109) to determine the indoor relative humidity. Row tX, if the indoor relative humidity Win exceeds wb,
The operating frequency setting means 14 sets the operating frequency Hz2 (Hzl>Hz 2), the output means 16 outputs a signal, and the frequency switching means 21 and the output means 22 change the operating frequency of the compressor (step 110).

Further, if the indoor relative humidity W in is lower than wb in step 109, the operation of the compressor is stopped (
Step 111).

Next, the operating frequency of the compressor is determined by comparing the operating frequency Hz sampled by the operating frequency detecting means 13 and the specified operating frequency Hz determined by the operating frequency setting means 14 by the comparing means 15 (step 112) (X , the operating frequency Hz is the specified operating frequency H
If it exceeds za, the upper limit P of the pulse expansion valve throttle opening
I and the lower limit P2 are set, a signal is output from the output means 12, and the pulse type expansion valve is throttled by the pulse output means 17, the transition means 18, and the output means 19 (step 113). Further, in step 112, the operating frequency Hz is set to the specified operating frequency H.
If it is less than za, the upper limit P of the pulse expansion valve throttle opening
3 and the lower limit value P4 are set (P3 has a larger amount of restriction than Pl, xP4 has a larger amount of restriction than P2), presses a signal from the output means 12, pulse output means 17, transition means 18, output means 19, the pulse type expansion valve is throttled (step 114). In the process up to now, the upper and lower limits of the compressor operating frequency and pulse expansion valve throttle opening during dehumidification operation have been determined. The indoor suction temperature is determined by comparing Tin with the specified indoor suction temperature Tb determined by the indoor suction temperature setting means 2 by the comparing means 3 (step 115). If the indoor suction temperature Tin is lower than the specified indoor suction temperature Tb, Return to the position between step 106 and step 107 Also, if the indoor suction temperature Tin exceeds the specified indoor suction temperature Tb, return to the position between step 102 and step 103. Optimum control for dehumidification operation is achieved by setting the operating frequency of the pump and adjusting the throttle opening of the pulse expansion valve.
Effects of the present invention that function to switch from dehumidifying operation to normal cooling operation The present invention (friends) has the effect of switching from dehumidifying operation to normal cooling operation. By optimally controlling the temperature, the dehumidifier maximizes the dehumidifying capacity while suppressing the drop in indoor temperature during dehumidifying operation, creating a comfortable living environment.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing control of an air conditioner in an embodiment of the present invention, and Fig. 2 is a block diagram of the same control.
5. Comparison means, 5. Indoor relative humidity detection means, 9. Pulse expansion valve throttle opening detection means, 1
3... Operating frequency detection means, 17... Pulse output means, 18... Transition hand north 21... Operating frequency switching means, 24... Indoor fan motor rotation speed switching hand north Name of agent: Patent attorney Akira Okaji and 2 others
Name 41 illustration

Claims (1)

[Claims] an indoor suction temperature detection means that detects and outputs the indoor suction temperature; a first comparison means that compares the indoor suction temperature with a set value and outputs a control signal; and an indoor relative humidity that detects and outputs the indoor relative humidity. A humidity detection means, a second comparison means that compares the indoor relative humidity with a set value and outputs a control signal, a variable operating frequency compressor, and a determination means that determines the cooling, heating, or dehumidification operation mode of the air conditioner. an operating frequency detecting means for detecting and outputting the operating frequency of the compressor; a third comparing means for comparing the operating frequency with a set value and outputting a control signal; and a variable throttling amount determined by the comparing means. a pulse type expansion valve throttle opening setting means for setting an upper limit value and a lower limit value for throttle opening setting of the pulse type expansion valve;
pulse output means and transition means for shifting the aperture opening of the pulsed expansion valve; an operating frequency changing means for changing the operating frequency of the compressor based on the signals from all the comparison means; and an indoor fan motor rotation. An air conditioner control device equipped with an indoor fan motor rotation speed changing means for changing the speed.