JPH062933A - Controller for air conditioner - Google Patents

Abstract

PURPOSE:To prevent, as an approach to comfortable air conditioning, a sharp change in the room temperature by appropriately controlling the number of revolutions of the blower through calculation of a controlling phase angle for the blower using the technique of fuzzy inference operation based on a deviation of the room temperature from the set point and a rate of change of the temperature of the heat exchanger. CONSTITUTION:A controlling microcomputer 3 compares, by the use of a comparison circuit 6, the room temperature TR detected by a room-temperature detective sensor 1 with a set temperature TS stored in a memory 5 and thereby obtains a temperature deviation DELTATR. The controlling microcomputer 3 also calculates, by the use of a calculation circuit 7, a rate of change with time DELTATp/t of the temperature of the heat exchanger on the basis of the temperature of the heat exchanger registered a certain period of time earlier and stored also in the memory 5, denoted by Tpo, and the temperature of the heat exchanger detected by a heat-exchanger-temperature detective sensor 2, denoted by Tp. Then a fuzzy controller 4 executes fuzzy inference operation on the basis of the temperature deviation DELTATR and the rate of change with time DELTATp/t of the temperature of the heat exchanger and according to control rules 8 and a membership-function converter 9. Eventually a controlling phase angle DELTAF for the blower is outputted and the phase angle F of the blower is controlled accordingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control device, and more particularly to control of an indoor blower at the start of heating operation and when the indoor heat exchanger is overheated.

[0002]

2. Description of the Related Art Conventionally, since the temperature of an indoor heat exchanger (hereinafter referred to as a heat exchanger) is low at the time of starting heating operation, until the temperature of the heat exchanger reaches a predetermined temperature after the compressor is started, The rotation speed of the indoor blower (hereinafter referred to as the "blower") is reduced to a breeze state to prevent the blowing of cold air, while the heat exchanger is overheated, the frequency conversion circuit reduces the rotation speed of the compressor. Methods have been taken to reduce the capacity of the compressor and reduce the load on the compressor. After starting heating operation,
When the heat exchanger temperature reaches a predetermined temperature, increase the rotation speed of the blower to secure a predetermined air volume, and after the air volume is secured, the heat exchanger temperature and the blower The number of rotations is changed. However, since the temperature of the heat exchanger has reached a predetermined temperature and the blowout temperature has not risen sufficiently when the air volume of the blower is increased, the room temperature may drop or the set temperature may not be reached easily. Further, when the heat exchanger temperature is in an overheated state, even if the capacity of the compressor is lowered, the air flow rate of the blower does not change, so the heat exchanger temperature cannot be lowered easily, which is an efficient air conditioner. I couldn't drive.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. The present invention speeds up the rise of the heat exchanger temperature at the start of heating operation, and the blower of the blower responds to the rise of the heat exchanger temperature. It is an object of the present invention to provide a control device for an air conditioner that speeds up the rise of indoor temperature by increasing the number of revolutions, and further increases the number of revolutions of the blower when the heat exchanger is overloaded to lower the temperature of the heat exchanger quickly. .

[0004]

In order to achieve the above object, means for detecting an indoor temperature in a control device, comparing means for comparing the detected indoor temperature with a set temperature, and an indoor heat exchanger temperature are detected. Means, a means for storing the indoor heat exchanger temperature, and an arithmetic means for calculating the temporal change rate of the indoor heat exchanger temperature, and the outputs of the two detecting means, the comparing means, and the arithmetic means. Based on this, fuzzy logic operation is performed to control the phase of the rotation speed of the indoor blower.

[0005]

According to the above construction, the frequency of the operation of the compressor is controlled according to the difference between the room temperature and the set temperature at the start of the heating operation, and the time-dependent rate of change of the indoor heat exchanger temperature is adjusted. By gradually increasing the rotation speed of the indoor blower, which was reduced at the start of heating operation, by phase control, the rise of the indoor temperature is accelerated, and when the indoor heat exchanger temperature becomes overheated, the indoor blower By increasing the rotation speed, the overheated state of the indoor heat exchanger can be reduced.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of a control device of the present invention, which is an indoor temperature detection sensor 1 for detecting an indoor temperature,
Heat exchanger temperature detection sensor 2 for detecting the temperature of the indoor heat exchanger, control microcomputer 3, and fuzzy controller 4
The control microcomputer 3 has a room temperature set temperature TS preset by a remote controller or the like, and a heat exchanger temperature T detected by the heat exchanger temperature detection sensor 1 before a certain time.
A memory 5 for storing P0 and the like, and a comparison circuit 6 for comparing the detected indoor temperature TR and the set temperature TS to obtain a deviation ΔTR.
And a ΔTP / t calculation circuit 7 for comparing the detected heat exchanger temperature TP with the heat exchanger temperature TP0 stored in the memory for a certain period of time to calculate the rate of change ΔTP / t of the heat exchanger temperature. The fuzzy controller 4 is provided with a membership function converter 9 for converting the fuzzy control rule 8 into a membership function, and takes in the outputs of the comparison circuit 6 and the ΔTP / t calculation circuit 7 to control the fuzzy control rule 8 and the membership function. A fuzzy logic operation is performed by the converter 9, the control phase angle ΔF of the blower is output, and the phase of the blower is controlled.

FIG. 2 is a principal block diagram for explaining the operation of the fuzzy controller 4. In the figure, the deviation ΔTR is obtained by comparing the room temperature TR detected at the start of heating operation with the set temperature TS, and the detected heat exchanger temperature TP is compared with the heat exchanger temperature TP0 before a certain time. Temperature T
The rate of change ΔTP / t of P is obtained and taken in as an input of the fuzzy controller 4, and this ΔTR and Δ shown in FIG.
The ΔTR grade is calculated from the TR membership function, and the ΔTP / t grade is calculated from ΔTP / t and the ΔTP / t membership function shown in FIG. 3 (b) to obtain the control rule 8 shown in FIG. Control phase angle Δ by fuzzy logic operation
The minimum value of F is obtained, the union operation is performed by the membership function of the control phase angle ΔF shown in FIG. 3C to obtain the center of gravity, and the operation of the blower is controlled as the operation phase angle F. The present invention will be described in detail. When the heating operation starts, the compressor increases the rotation speed by frequency control until the heat exchanger temperature TP reaches a temperature corresponding to the set temperature TS due to the difference between the set temperature TS and the room temperature TR. At the same time, the number of revolutions of the blower is reduced to a breeze operation that does not generate cold air, and the number of revolutions of the blower is controlled by the control phase angle ΔF obtained from the fuzzy controller 4 corresponding to the rate of change ΔTP / t of the heat exchanger temperature TP. Is gradually increased, and when the room temperature TR reaches the set temperature TS, it is controlled so as to return to the normal rotation speed determined by the room temperature. When the heat exchanger is overloaded, the fan speed is increased in response to the rate of change ΔTP / t of the heat exchanger temperature TP to cool the heat exchanger, thereby overloading the heat exchanger. It acts to eliminate the problem as soon as possible.

[0008]

As described above, in the present invention, the control phase angle of the blower is obtained by the fuzzy logic operation using the difference between the detected indoor temperature and the set temperature and the rate of change of the heat exchanger temperature as input, and the heating operation is started. At the time and / or when the heat exchanger is overloaded, the rotational speed of the blower is appropriately controlled to prevent a rapid change in the room temperature, and a comfortable air-conditioning environment can be created.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a control device of the present invention.

FIG. 2 is a principal block diagram for explaining the operation of the fuzzy controller.

FIG. 3 is a diagram showing a membership function.

FIG. 4 is a diagram showing a control rule.

[Explanation of symbols]

 1 Indoor temperature detection sensor 2 Heat exchanger temperature detection sensor 3 Control microcomputer 4 Fuzzy controller 5 Memory 6 Comparison circuit 7 ΔTP / t calculation circuit 8 Fuzzy control rule 9 Membership function converter

Claims (1)

[Claims] 1. A controller for an air conditioner configured to phase-control the number of revolutions of an indoor blower, wherein the controller detects a room temperature, and a comparison for comparing the detected room temperature with a set temperature. Means, a means for detecting the temperature of the indoor heat exchanger, a means for storing the temperature of the indoor heat exchanger, and a calculation means for calculating the temporal change rate of the temperature of the indoor heat exchanger. A control device for an air conditioner, characterized in that fuzzy logic operation is performed based on the outputs of the detection means, the comparison means, and the operation means, and the rotational speed of the indoor blower is phase-controlled.