JPS6220462B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for controlling air blowing in an air conditioner or the like.

Conventionally, in air conditioners such as air conditioners used in homes, when performing air conditioning operation at a fixed wind speed selected from limited air blowing speeds such as strong wind, weak wind, and breeze, it is necessary to Since the airflow is constantly discharged in the same direction, there is a tendency to generate a stationary distribution of wind speed and temperature in the room to be air-conditioned. This is not only more noticeable and uncomfortable because the room is generally closed when the air conditioner is running to increase the air conditioning effect, but also when reading or sleeping in an air conditioned room, which does not require a relatively high metabolic rate. Because there is a large difference in temperature distribution and the area under optimal conditions is small, it may become too cold even in some areas, which may endanger your health or make it impossible to use the indoor space effectively, making it uneconomical, and it is difficult to set and select optimal conditions. There were drawbacks such as:

Figure 1 is a schematic explanatory diagram of an air conditioner installed in a general house, where a is the air conditioner, b is the space to be air-conditioned (indoor), c is the heat exchanger, d is the motor with a blower fan, and e is the air conditioning control. It is a board.

In order to eliminate the above-mentioned decision point, the present invention provides a uniform air blowing control method that obtains a large number of relatively uniform optimum condition areas.

In order to achieve this objective, the present invention blows air to a relatively long distance when the blowing speed is high, and stays at a relatively short distance when the blowing speed is low, and the air reaching distance is approximately proportional to the blowing speed or the number of rotations of the blower motor. By paying attention to the relationship shown above, and smoothly changing the wind speed or motor rotation speed within a changeable range as time progresses, we hope to synergize with the effect of adjusting the diffusion angle of the air conditioning control plate at the discharge port. I have to.

That is, the present invention aims to bring the space to be air-conditioned into a relatively uniform air-conditioned state by bringing the space to be air-conditioned into a transient state where it is constantly disturbed to an extent that does not cause any trouble. As a specific means, the air blowing speed can be changed in relation to time between the highest value (Hi) and the lowest value (Lo) within the air blowing speed control range, or between two high and low set values in between. The change (temporal rate of change) is controlled so that it changes relatively slowly in a constant direction, and when the terminal value is reached, it is maintained at that terminal value for a certain period of time, and then the direction of increase/decrease in the wind speed change is reversed to the same as before the reversal. Controlling changes at different time change rates is periodically repeated.

The present invention will be explained in detail below with reference to the drawings.

Figure 2 is a diagram showing the relationship between the outlet air blowing speed and time of an air conditioner embodying the present invention; both A and B have time on the horizontal axis and air blowing speed (or fan motor rotation speed) on the vertical axis. There is. The wind speed change temporally increases within t ₁ hours and decreases within t ₂ hours, whereas in Figure 2 B, the direction of the wind speed change is immediately reversed as soon as the terminal value of the wind speed change is reached. So, Figure 2A
In this case, the terminal value is held at the terminal value for a certain period of time t _H or t _L without being immediately reversed. Note that t ₅ is the time of one cycle of the wind speed change characteristics. Also, instead of a continuous change in wind speed in a single direction as in A and B, C,
It is also possible to add the effect of eliminating synchrony by performing complex movements like D and E.

Next, an explanation will be given of an air blowing control device in an air conditioner implementing the present invention for performing the above air conditioning. FIG. 3 is a diagram showing an example of the configuration of the ventilation control device. In this figure, 14 is the commercial power input terminal, 13
1 is a constant voltage DC power supply section, and 1 to 12 are the main parts of the control device, which perform a so-called microcomputer function. 1 is a zero-phase detection control circuit, 2 is a first input terminal of the central control processing unit 12 (hereinafter abbreviated as CPU 12), 3 is an operation setting control circuit, 4
is the second input terminal of the CPU 12, 5 is the analog-digital (A-D) conversion control circuit, and 6 is the CPU 1
2, 7 is a clock oscillation circuit, 8 is its input terminal, 9 is an external device control circuit, 10, 11
are the first and second control output terminals of the CPU 12.
More specifically, the zero-phase detection control circuit 1 detects the zero-phase timing (zero-crossing point) of the power supply voltage or current waveform and controls the rotation speed of the fan motor. This is a circuit that controls the firing phase of a thyristor inserted in series between them, and generates a pulse that is the starting point of time measurement control at each zero-phase time point and outputs it to the input terminal 2. The operation setting control circuit 3 is a circuit for setting operations such as stopping and running the air conditioner, and changes in functions, and is composed of switches, resistors, semiconductors, and the like. Although the signal conversion circuit 5 is not shown, it converts an analog current (or voltage) proportional to the temperature value detected by a sensor such as a thermistor installed in an air-conditioned room or an air conditioner, or the set resistance value of a set volume control. A circuit that converts into digital data with high processing efficiency.
It is configured as a D conversion circuit or an integral type A-D conversion circuit. The external device control circuit 9 is composed of control elements such as thyristors, relays, resistors, and semiconductor circuits for the purpose of performing phase control, temperature control, temperature display control, etc. of the thyristor. Furthermore, the clock oscillator 7 generates a stabilized clock pulse using a small crystal oscillator, generally on the order of MHz. 2nd of CPU12
The control output 11 is sent to the CPU from circuits 1, 3, 5, etc.
The purpose is to perform so-called matrix input, synchronization input, discrimination input, etc. at the input terminals 2, 4, and 6 to 12 as necessary.

Now, as shown in Figure 3, it is equipped with an input and output circuit, and is composed of a so-called microcomputer, LSI, etc.
The operation of the CPU 12 will be explained next. In addition, CPU12
The operation is also shown in the flowchart of FIG. 4 and its modification, FIG. 5, and its functions will be explained in order. First, in synchronization with the power-on of the circuit shown in Figure 3, the contents of the CPU's internal (or external) storage section (random access memory RAM) are cleared, and the power supply frequency is predetermined by the input from terminal 2. The frequency is determined, and the air conditioner is set to a predetermined initial state (first function), and then the power supply voltage is determined by the signal from the first input terminal 2. Wait until it is determined that the detection of the zero-phase period of the wave has been completed (second function), then change the basic operation time t ₀ (see Figure 2) to change the fan motor rotation speed in the minimum unit. It is determined that the number of rotations of the fan motor has passed (third function), then it is determined that the direction of change in the rotation speed of the fan motor is in the decreasing direction (fourth function), and then the rotation speed of the fan motor is currently at its lowest value. Determines that L is not ₀ and proceeds to the next operation (fifth function). At this time, the data value is corrected (-1) to decrease the rotation speed of the fan motor by a predetermined percentage (sixth function) ), on the other hand, if it is determined that the rotation speed of the fan motor is not in the decreasing direction but in the increasing direction at the time of the fourth function, it is determined that the rotation speed of the fan motor is not the maximum value Hi, and the process proceeds to the next step (seventh function).
function), at this time, the data value is corrected (+1) in order to increase the rotation speed of the fan motor by a predetermined percentage (eighth function), and the fifth function
If it is determined that the rotation speed of the fan motor is L ₀ in the function (stage), it is determined that a predetermined minimum value duration T _L has elapsed (ninth function), and the determination output is Therefore, the direction of change in the rotation speed of the fan motor is reversed (10th function), and when it is determined that the fan motor rotation speed is equal to the maximum value H _i in the step of the 7th function, the maximum value duration is determined in advance. It is determined that t _H has elapsed (eleventh function), and the direction of change in the rotational speed of the fan motor is reversed based on the determination output (twelfth function).

Next, a first case in which it is determined that the basic operating time t ₀ has not elapsed in the third function stage, and a second case in which it has been determined that the time t _L has not elapsed in the ninth function stage; A third case in which it is determined that the time t _H has not elapsed in the eleventh function stage, a fourth case in which the tenth function stage has ended, and a fourth case in which the twelfth function stage has ended. 5 and the 6th case where the above 6th function stage has been completed.
The data values created in each case are set as data for executing the thyristor phase control in each case (13th
function), then determines whether or not the blower is operating based on the clock signal and the contents specified in the first function stage (14th function), and if it is determined that it is operating, the result of the 13th function is determined. The thyristor phase control is performed so that the fan motor rotation speed is appropriate based on the 15th function (15th function).
skipping the functional stage. In addition, if it is determined that so-called clock processing such as pulse counting, carry, and judgment for making a clock such as a period, timing, or timer in the 3rd, 9th, and 11th functional steps described above is not necessary, then the following 17th function step is necessary. If it is determined that clock processing is necessary, proceed to the next step (17th function) (16th function), then perform clock processing (17th function), and then change the operation details. In the process of detecting changes in function settings, etc. via the second input terminal 4, a so-called key is used.
If it is determined that no processing is necessary, the next step (19th function) is skipped; on the other hand, if it is determined that key processing is necessary, proceed to the next step (18th function), then key processing is performed. is performed according to predetermined contents (19th function), and then the next step if it is not determined through the third input terminal 6 that A-D conversion processing is necessary. (21st function), and if it is determined that A-D conversion is necessary, proceed to the next step (21st function) (20th function), and then predetermine A-D conversion processing. (21st function), and after completing this process, return to the second function stage (22nd function).
By repeating the control process (function) according to the clock during the operating time of the air conditioner, the above-mentioned air blowing effect, that is, uniform air blowing control can be achieved.

Note that in FIG. 4, for example, step #15 of the 14th function that determines that the operation content is driving is replaced by
It is possible to obtain the same effect even if it is provided at position #15 shown in the figure, and it is also possible to perform air blow control in combination with other elements such as temperature control. In addition, in the above example, the rotation speed is controlled in stages, but unlike conventional methods, there are two types of rotation speed control: weak, weak, strong, etc.
It is also possible to perform repetitive control by repeating the rotation speed change in ~3 steps.

As described above in detail, the present invention has the following two points.

(b) Keep the air blowing speed at a constant value for a certain period of time at one of the two predetermined high and low end values within the controllable range.

(b) When the air blowing speed is changed in a certain direction at a predetermined rate of change for a predetermined period of time between two predetermined high and low end values, and one of the high and low end values is reached, As in (a), after holding the wind speed at a constant value for a certain period of time, the direction of change in wind speed is reversed, and the process is repeated to change the wind speed to the other end value at a time change rate different from that before the reversal.

By performing such control, according to the present invention, it is possible to avoid the phenomenon that the control cycle is not fixed and the unevenness caused by so-called standing waves is fixed, and literally "no" air blow control can be performed. It can be realized. This effect is good for your health because it prevents you from getting too cold, and it also helps conserve energy because it reduces unnecessary usage. In addition, since the blower motor usually has a small capacity, a wind speed variable device with a relatively inexpensive circuit configuration can be obtained, and there is no need to provide control terminals for strong, weak, weak, etc. on the motor windings, so the present invention The economic burden of providing a control device is more than offset and is therefore economical.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an air conditioner for a general house, Fig. 2 is an example of the change in air speed over time of an air conditioner embodying the present invention, and Fig. 3 is an illustration of air blow control in an air conditioner embodying the present invention. FIGS. 4 and 5 are flowcharts showing the operation of the apparatus shown in FIG. 3. a...Air conditioner, b...Air conditioned space, c...Heat exchanger,
d...Motor with ventilation fan, e...Air direction rectification control board, 1...Zero phase detection control circuit, 3...Operation setting control circuit, 5...A-D conversion control circuit, 7...Clock oscillation circuit, 9...External device control Circuit, 12... Central control processing unit (CPU), 13... Constant voltage DC power supply, 14... Commercial power supply input.

Claims (1)

[Claims] 1 Change the air blowing speed of the air blower in the air conditioner in a certain direction at a predetermined constant rate of change over time within two predetermined high and low end values within the controllable range of the air blowing speed of the air blower. When the wind speed reaches one end value of the above-mentioned speed, the wind speed is maintained at the above-mentioned one end value within a predetermined period of time, and then the direction of wind speed change is reversed until it reaches the other end value of the above-mentioned speed for a different time than before the reversal. A uniform air blow control method characterized by controlling to repeat a process of changing at a rate of change.