JPH03213942A - Controller of air-conditioner - Google Patents

Abstract

PURPOSE:To suppress the growth of frost on an outdoor heat exchanger and to improve an integrated heating capacity in a low-temperature operation by increasing the speed of an outdoor fan to be higher than that in a normal heating operation when an outside-air temperature is a set temperature of below and in integrated current is a set current value or below. CONSTITUTION:An outside-air temperature sampled by an outside-air temperature detecting means 1 and a set value 2 of the outside-air temperature set beforehand are compared with each other by a comparing means A5 and it is determined whether the outside-air temperature is lower than the set value 2 of the temperature or not. Subsequently, a detected current sampled by an integrated current detecting means 3 and a set value 4 of an integrated current set beforehand are compared with each other by a comparing means B6 and determination of the integrated current is executed. Receiving the results of comparison from the comparing means A5 and B6, an arithmetic means 7 switches the speed of an outdoor fan 10 to be increased, when the outside-air temperature < the set value 2 of the temperature and the integrated current < the set value 4 of the current. In other cases, a control is made for a normal heating operation.

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 rotation speed of the outdoor fan during heating operation (from one defrosting operation to the next defrosting operation) is always controlled at the same speed regardless of the outside temperature. I was worried.

(Problem to be solved by the invention) In conventional control, the temperature of the refrigerant discharged by the compressor during low-temperature operation (hereinafter referred to as discharge temperature) is the same low temperature as during normal heating operation. Even if the load in the room increased, the heating capacity of the air conditioner could not keep up 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. and an outdoor fan speed switching means that switches the outdoor fan speed based on the output signal of the calculation means.

(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 outdoor fan speed setting is increased compared to during normal heating operation. .

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;
8 is an outdoor fan speed switching means for switching the outdoor fan speed based on the output signal of the calculation means 7; 9 is an outdoor fan speed switching means 8; Outdoor fan 1 by control signal
This is a driving means for driving 0.

Next, the operation of this embodiment will be explained with reference to the flowchart shown in 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 T is lower than the temperature setting value Ta. (Step 1).

Next, the comparison means B6 compares the detected current I sampled by the total current detection means 3 and a preset total current setting value Ia to determine the total current (step 2).

The calculation means 7 receives the comparison results from each comparison means A and B, and switches to increase the outdoor fan speed if the outside air temperature T1<temperature set value Ta and the total current I+<current set value 1a. . In other cases, control is performed as 5 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 low-temperature operation is being performed based on the outside air temperature and the overall current state of the air conditioner, the outdoor fan speed is increased compared to normal heating operation. This suppresses the growth of frost on outdoor heat exchangers,
By blowing out high-temperature air, the cumulative heating capacity during low-temperature operation 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.
It is a flowchart of the same example. 1...Outside temperature detection means, 3...Comprehensive current detection means, 5...Comparison means A, 6...Comparison means B, 7...Calculation means, 8...Outdoor fan speed switching means , 9...driving means, io...outdoor fan.

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.
an outdoor fan speed switching means for switching the outdoor fan speed according to the output signal of the calculation means, and when the outside air temperature is below the set temperature and the total current is below the set current value, the outdoor fan speed is changed to normal heating operation mode. A control device for an air conditioner that is characterized by being able to operate even faster than before.