JPH03213938A - Controller of air-conditioner - Google Patents

Abstract

PURPOSE:To improve an integrated heating capacity by increasing the speed of indoor and outdoor fans to be higher than that in an ordinary heating operation and by raising a refrigerant discharge temperature, when an outside-air temperature is a set temperature or below and an integrated current is a set current value or below. CONSTITUTION:When an instruction on a heating operation is given from a remote-controller or an operating panel, outdoor and indoor fans 14 and 15 and a compressor start to operate. When it is determined by a comparing means 5 that an outside-air temperature detected by a detecting means 1 is lower than a set value 2 and it is determined by a comparing means 6 that a current detected by a detecting means 3 is an integrated current value set beforehand or below, an arithmetic means 7 makes the speed of the outdoor fan 14 and that of the indoor fan 15 increased by speed switching means 8 and 9. At the same time, the opening of an expansion valve 16 is changed over by a change- over means 10 and the discharge temperature of a refrigerant from the compressor is also raised. In this way, an integrated heating capacity at the time of a low-temperature operation can be improved.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention distinguishes between normal heating operation of an air conditioner and heating operation when the outside temperature is particularly low (hereinafter referred to as low-temperature operation). The present invention relates to a control device for an air conditioner that performs good control.

(Conventional technology) In conventional air conditioners, the rotational speed of indoor and outdoor fans during heating operation (from one defrosting operation to the next defrosting operation), the temperature of the refrigerant discharged by the compressor (hereinafter referred to as discharge temperature) ) was always controlled with the same control content regardless of the outside temperature.

(Problem to be solved by the invention) In this way, in conventional control, the discharge temperature during low-temperature operation is the same low temperature as during normal heating operation, so the load on the room increases as during low-temperature operation. Even the heating capacity of the air conditioner could not cope with the load. In other words, there was a tendency for the integrated capacity, which represents the performance of one cycle from the start of low-temperature operation to the end of defrosting operation, in unit time, to decrease significantly.

The present invention solves the above problems, and performs load-based control only when the outside air temperature during heating operation is below a certain specified temperature and the total current of the air conditioner is below a certain specified current value. The purpose of this invention is to provide a control device with

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an outside air temperature detection means and a comparison means for comparing the detected temperature with a preset outside air temperature setting value and outputting the result. A, a comprehensive current detecting means of the air conditioner and a comparing means B that compares the detected current with a preset comprehensive current setting value and outputs the result, and based on each output value of the comparing means A and B. an outdoor fan speed switching means for switching the outdoor fan speed, an indoor fan speed switching means for switching the indoor fan speed, and an indoor fan speed switching means for switching the indoor fan speed based on the output signal of the calculation means; and discharge temperature switching means for switching the discharge temperature.

(Function) With the above configuration, only when the outside air temperature is below a certain specified temperature and the total current of the air conditioner is below a certain specified current value, the indoor and outdoor fan speed settings are increased compared to during normal heating operation. and switch to increase the discharge temperature.

This makes it possible to suppress frost formation during low-temperature operation, blow out high-temperature air, and improve integration capacity.

(Example) An embodiment will be described in detail below with reference to one drawing.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, in which 1 is an outside air temperature detection means, and 5 is a means for comparing the detected temperature with a preset outside air temperature setting value 2. 3 is a comparison means A that outputs a result, 3 is a total current detection means, 6 is a comparison means B that compares the detected current with a preset total current setting value 4, and outputs the result; 7 is a comparison means A;
Calculation means 8, 9.10 calculates based on each output value of B and outputs a required signal, outdoor fan speed switching means 8, 9, and 10 change the outdoor fan speed according to the output signal of the calculation means 7, and indoor fan speed is changed. An indoor fan speed switching means for switching and a discharge temperature switching means for switching the discharge temperature; 11 is a drive means A for driving the outdoor fan 14 according to a control signal from the outdoor fan speed switching means 8; 12 is a drive means A for driving the outdoor fan 14 according to a control signal from the indoor fan speed switching means 9; Drive means B and 13 for driving the indoor fan 15 are drive means C for driving the expansion valve 16 in response to a control signal from the discharge temperature switching means 10.

Next, the operation of this embodiment will be explained with reference to the flowchart of FIG. When heating operation is instructed using the remote control or operation panel, the indoor/outdoor fan and compressor start operating.

Here, the comparison means A5 compares the outside air temperature T1 sampled by the outside air temperature detection means 1 and the preset outside air temperature setting value Ta, and determines whether the outside air temperature T1 is lower than the temperature setting value Ta. Determine (Step 1) 0
Next, the comparison means B6 compares the detected current value 1 sampled by the total current detection means 3 with a preset total current setting value Ia to determine the total current (step 2).

The calculation means 7 receives the comparison results from the comparison means A and B, and when the outside air temperature TI<temperature set value Ta and the total current 11<the current set value Ia, calculates the outdoor fan speed and the indoor fan speed, respectively. At the same time, the discharge temperature is also increased. In other cases, control is performed as 1 normal heating operation.

Note that this control operation is repeated.

(Effects of the Invention) As explained above, according to the present invention, when it is determined that the operation is at a low temperature based on the outside air temperature and the state of the total current of the air conditioner, the outdoor fan speed is reduced compared to the normal heating operation. By increasing the temperature, the growth of frost on the outdoor heat exchanger is suppressed, by increasing the indoor fan speed, the heat exchange efficiency of the indoor heat exchanger is increased, and by further increasing the discharge temperature, high temperature air is blown, resulting in low-temperature operation. The cumulative heating capacity can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
1 is a flowchart of the same embodiment; 1...Outside temperature detection means; 3...Comprehensive current detection means; 5...
・Comparison means A, 6 ... Comparison means 8. 7...
Calculating means, 8...Outdoor fan speed switching means, 9
... Indoor fan speed switching means, 10... Discharge temperature switching means, 11 Drive means A, 12... Drive means B, 13
...Driving means C114...Outdoor fan, 15...
Indoor fan, 16...expansion valve.

Claims (1)

[Claims] An outside air temperature detection means and a comparison means A that compares the detected temperature with a preset outside air temperature setting value and outputs the result, and an air conditioner comprehensive current detection means and its detected current. and a preset total current set value, and a comparator B that outputs the result, and a computation unit that performs computation based on each output value of the comparator A and B and outputs a desired signal.
It is comprised of an outdoor fan speed switching means for switching the outdoor fan speed, an indoor fan speed switching means for switching the indoor fan speed, and a discharge temperature switching means for switching the discharge temperature of the refrigerant discharged by the compressor, according to the output signal of the calculation means, An air conditioner control device characterized in that when the temperature is below a set temperature and the total current is below a set current value, the indoor/outdoor fan speed is increased compared to that during normal heating operation, and the discharge temperature is also increased. .