JPH03211344A - Controlling device for air conditioner - Google Patents

Abstract

PURPOSE:To improve an accumulated heating capability under a low surrounding air temperature by a method wherein a pulse output mode for determining a speed of each of an indoor fan and an outdoor fan and the valve travel of an expansion valve is changed from that of a normal heating operation in response to an outdoor temperature, a temperature of an outdoor heat exchanger, an operating frequency and an indoor fan speed. CONSTITUTION:A frequency detected by an operating frequency detection means 5 of a compressor is compared with a predetermined frequency by a comparisn means C11 so as to discriminate an operating frequency. A speed detected by an indoor fan speed detection means 7 is compared with a predetermined speed by a comparisn means D12 so as to discriminate an indoor fan speed. In the even that each of the outdoor temperature and a temperature of the outdoor heat exchanger is less than a certain predetermined temperature and further that the indoor fan speed is more than the specified speed, a setting of each of the indoor fan speed and the outdoor fan is increased more than that of the normal heating operation and further a pulse output mode is changed over in such a direction as to reduce the valve travel of an expansion valve. With such an arrangement, it is possible to restrict a frosting state under a low temperature operation, blow hot air and to improve an accumulating capability.

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, pulse output corresponds to the rotational speed of the indoor/outdoor fan and the operation (drive) frequency of the expansion valve during heating operation (from one defrosting operation to the next defrosting operation). The mode is
The control content was always the same regardless of the outside temperature.

(Problem to be solved by the invention) In this way, in conventional control, the indoor and outdoor fan speed settings during low-temperature operation are the same as during normal heating operation, so the temperature of the refrigerant discharged by the compressor during operation is (Discharge temperature) was also low as in normal heating operation, and even if the load in the room increased as in low-temperature operation, 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-mentioned problems, and is provided when the outdoor temperature and the outdoor exchanger temperature during heating operation are each below a certain specified temperature, and the operating frequency is above the specified frequency, and the indoor fan speed is the specified speed. In the above case, it is an object of the present invention to provide a control device that performs load-based control.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides an outdoor temperature detection means and a comparison means for comparing the detected temperature with a preset outdoor temperature setting value and outputting the result. A, an outdoor heat exchanger temperature detection means and a comparison means B that compares the detected temperature with a preset outdoor heat exchanger temperature setting value and outputs the result, and a compressor operating frequency detection means and its Comparing means C that compares the detected frequency with a preset specified frequency and outputs the result; indoor fan speed detection means; and compares the detected speed with a preset specified speed and outputs the result. A means of comparison.

a calculation means for calculating and outputting a required signal based on each output value of the comparison means A, B, C, and D; an outdoor fan speed switching means for switching the outdoor fan speed based on the output signal of the calculation means; It is comprised of a pulse output mode switching means for switching the opening degree of the expansion valve corresponding to the operating frequency, and an indoor fan speed switching means for switching the indoor fan speed.

(Function) With the above configuration, when the outdoor temperature and the outdoor heat exchanger temperature are each below a certain specified temperature, the operating frequency is above the specified frequency, and the indoor fan speed is above the specified speed, the indoor and outdoor The fan speed is set higher than during normal heating operation, and the pulse output mode is switched to reduce the opening of the expansion valve.

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

(Example) Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. Reference numeral 1 indicates an outdoor temperature detection means, and 9 indicates a temperature that is determined by comparing the detected temperature with a preset outdoor temperature setting value 2. 3 is an outdoor heat exchanger temperature detection means, and 10 is a comparison means A that outputs the result, and 10 is a comparison means B that compares the detected temperature with a preset outdoor heat exchanger temperature setting value 4 and outputs the result.
, 5 is compressor operating frequency detection means, 11 is comparison means C17 for comparing the detected frequency and a preset specified frequency 6 and outputs the result, indoor fan speed detection means, 12 is the detected speed and Comparing means D and 13 for comparing with a preset specified speed 8 and outputting the result are calculating means for calculating based on each output value of comparing means A, B, C, and D and outputting a required signal; Reference numerals 14, 15 and 16 refer to outdoor fan speed switching means for switching the outdoor fan speed, pulse output mode switching means for switching the opening degree of the expansion valve corresponding to the operating frequency of the compressor, and indoor fan, respectively, based on the output signal of the calculation means 13. An indoor fan speed switching means 17 for switching the speed is a driving means A, 18 for driving the outdoor fan 20 according to a control signal of the outdoor fan speed switching means 14.
Reference numeral 19 indicates driving means B which drives the expansion valve 21 in response to a control signal from the pulse output mode switching means 15, and drive means C which drives the indoor fan 22 in response to a control signal from the indoor fan speed switching means 16.

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 outdoor temperature T1 sampled by the outdoor temperature detection means 1 and the preset outdoor temperature set value Ta are compared by the comparing means A9, and whether the outdoor temperature T is lower than the temperature set value Ta is determined. (Step 1) 0
Next, the comparison means BIO compares the detected temperature T2 sampled by the outdoor heat exchanger temperature detection means 3 with a preset outdoor heat exchanger temperature setting value Tb, and determines the outdoor heat exchanger temperature (step 2). ).

Furthermore, in the same manner, the frequency I! detected by the operating frequency detection means 5 of the compressor! and preset specified frequency/a
The comparing means C1l compares the operating frequency to determine the operating frequency (step 3), and the comparing means D12 compares the speed n1 detected by the indoor fan speed detecting means 7 with a preset specified speed na. Determine the speed (
Step 4).

The calculation means 13 receives the comparison results from each comparison means A, B, C, and D, and calculates the outdoor temperature TI<temperature set value Ta, outdoor heat exchanger temperature T2<temperature set value Tb, operating frequency/+>
Specified frequency/a and indoor fan speed n1≧specified speed n
In case a, set the outdoor fan speed to V.

→ v2, and the indoor fan speed is increased by one step from N1 → N2, and the pulse output mode is switched from P- → Pq in the direction of narrowing the opening degree of the expansion valve.

In other cases, it is controlled by Vp, N', and P-.

(Effects of the Invention) As explained above, according to the present invention, the pulse that determines the speed of the indoor/outdoor fan and the opening degree of the expansion valve according to the conditions of the outdoor temperature, the outdoor heat exchanger temperature, the operating frequency, and the indoor fan speed. By changing the output mode from normal heating operation, the cumulative heating capacity can be improved, especially when the outside temperature is low.

[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... Outdoor temperature detection means, 3... Outdoor heat exchanger temperature detection means, 5... Compressor operating frequency detection means, 7... Indoor fan speed detection means, 9... Comparison means A , 10... Comparison means B, 11... Comparison means C112... Comparison means R. 13... Calculating means, 14... Outdoor fan speed switching means, 15... Pulse output mode switching means, 16...
Indoor fan speed switching means, 17... Drive means A, 8 Drive means B, 9 Drive means C5 0 Outdoor fan, 1 Expansion valve, 2 Indoor fan.

Claims (1)

[Scope of Claims] An outdoor temperature detection means and a comparison means A that compares the detected temperature with a preset outdoor temperature set value and outputs the result; an outdoor heat exchanger temperature detection means and the detected temperature; Comparing means B which compares a preset outdoor heat exchanger temperature setting value and outputs the result; compressor operating frequency detecting means; and a compressor operating frequency detecting means which compares the detected frequency with a preset specified frequency and Comparing means C for outputting a result; Comparing means D for comparing an indoor fan speed detecting means and its detected speed with a preset prescribed speed and outputting the result;
a calculation means for calculating and outputting a required signal based on each output value of the comparison means A, B, C, and D; an outdoor fan speed switching means for switching the outdoor fan speed according to the output signal of the calculation means; It consists of a pulse output mode switching means that switches the opening degree of the expansion valve corresponding to the operating frequency of the machine, and an indoor fan speed switching means that switches the indoor fan speed. When the frequency is above the specified frequency and the indoor fan speed is above the specified speed, the indoor/outdoor fan speed is increased compared to normal heating operation, and the pulse output mode is switched to reduce the opening of the expansion valve. Features: Air conditioner control device.