JPS6220458B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control method for a heat pump type air conditioner, and in particular, when switching between cooling operation and heating operation, the temperature at a predetermined position in the room is kept at the same value, and the temperature is adjusted as a guideline. One of the purposes is to make it easier to set up and set up comfortable air conditioning.

Generally, the indoor unit of a separate air conditioner is installed as shown in FIGS. 1 and 2. That is, in the same figure, a is the indoor unit of the heat pump type air conditioner installed at a position 2 m from the floor, b is the blowing direction of conditioned air,
c indicates the indoor air intake, each indoor curve A to I indicates isothermal lines connecting parts of the same temperature, and the position of each * mark indicates the position of the user during normal cooling operation and heating operation. Indicates the location of This position of the user is, of course, an example of a position in daily life.

In conventional heat pump air conditioners, during daily use, when switching from cooling operation to heating operation, or vice versa, when switching from heating operation to cooling operation, the temperature controller remains at the same stage as the previous operation without readjusting. The heat pump air conditioner will start operating by adjusting the temperature.

Therefore, the temperature distribution in the cooling operation and the heating operation when the adjustment of the temperature controller is the same as described above is as shown in FIG. 1 for the cooling operation and as shown in FIG. 2 for the heating operation.

In conventional heat pump air conditioners,
Each cooling/heating operation is performed using the temperature measured by the air temperature detector installed at the indoor air intake port c of the indoor heat exchanger as the indoor temperature.

However, according to Figures 1 and 2, the temperature at the indoor air intake is almost the same during both cooling and heating operations, so the temperature at other locations during cooling and heating differs. The difference in distribution could not be compensated for, causing an unpleasant feeling of not getting warmer when switching from cooling to heating mode.

In other words, let's assume that the user's position is 2 meters from the wall where the heat pump type air conditioner is installed in the front direction of the air conditioner and 50 cm from the floor, marked with an *.
If the wind speed is constant, the temperature is 22.0°C during cooling as shown in Figure 1, and 20.0°C during heating as shown in Figure 2. This two-degree temperature difference causes the user to switch from cooling to heating operation. I felt cold when I switched from heating to cooling, and felt hot when I switched from heating to cooling. Therefore, in the past, users had to
The temperature regulator had to be readjusted, causing discomfort to the user and forcing the user to perform troublesome adjustment work.

In order to eliminate such drawbacks, for example,
As shown in Publication No. 152858, it is known to provide a temperature compensation resistor in the circuit of a temperature detection resistor element, and to perform temperature compensation by adding or short-circuiting the resistor in response to switching between cooling and heating. . However, with such a structure, it is possible to obtain a comfortable cooling temperature or comfortable heating temperature according to the set notch without performing temperature adjustment operations, but when cooling, for example, when changing the wind speed, the comfortable temperature can be reached at a certain notch. However, just as the notch is insufficient during heating, temperature compensation has already been made in the event that the temperature cannot be maintained at the same level during cooling and heating.
The drawback is that it is difficult to consider how much the notch should be reset.

Also, depending on the setting position, such a structure can be used for cooling,
It is possible that the temperature for both heating and heating will be the same, but this is only when the air speed is constant; if you change the air speed or air volume, the distance the air reaches will change, and at a fixed location in the room. ,
This has the disadvantage that the temperature changes depending on the air blowing capacity and must be readjusted according to the air blowing capacity.

In view of the above-mentioned facts, the present invention has been developed to provide a heat pump type air conditioner so that the set temperature remains the same at the set position indoors even when switching between cooling operation and heating operation is performed and even when the wind speed is controlled. This correction makes it easy to determine the subsequent temperature settings.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In Fig. 3, 1 is a microcomputer that is the center of temperature control, and 2 is a contact that starts heating operation.By turning this contact 2 to the + side, a signal to start heating operation is sent to microcomputer 1.
A heating operation program is input from the input port _I1 on the side, and operation is started.

3 is a variable resistor as a temperature regulator, 4 is an air temperature sensor with negative characteristics installed at the indoor air intake of the indoor heat exchanger, and the set temperature by temperature regulator 3 and the air temperature sensor A composite output of the temperature of the indoor air detected by the comparator 4 is input to the input side a of the comparator 5 in the form of a voltage level.

6 is the output port O ₁ of microcomputer 1
The group of resistors connected to ~ _O7 constitutes a simple A/D converter circuit together with the output processing section of the microcomputer 1. The output of the simple A/D converter circuit is input to the input side b of the comparator 5.

The output operation of the temperature control signal of the comparator 5 is as follows.

That is, the output ports _O1 to _O7 of the microcomputer 1 have a combination of logical outputs with a certain time series regularity, as shown in FIG.
PLA signal is being output. Therefore, this
The output of the simple A/D converter circuit formed by the PLA signal and resistor group 6 is a step-like voltage timing waveform in which the voltage value (level) increases (or decreases) in sequence as shown in the figure. This stepped voltage timing waveform is periodically applied to the input side b. Each voltage value of the voltage timing waveform is defined as a temperature difference value from the temperature setting value set in the temperature controller 3. In other words, the output of the simple A/D converter circuit varies, for example, every 1 degree. A stepped voltage timing waveform is obtained in the range of -3 degrees to +3 degrees (not limited to this range).

In addition, the comparator 5 outputs a voltage level obtained by combining the temperature set by the temperature controller 3 inputted to the input terminal a and the actual indoor air temperature detected by the air temperature detector 4, and the voltage level obtained from the synthesis of the temperature set by the temperature controller 3 inputted to the input terminal a, and the voltage level from the microcomputer 1 inputted to the input side b. The voltage level obtained by sampling the temperature difference is compared, and when they match, a signal is output, and the microcomputer outputs one of the temperature difference samples output from output ports _O1 to _O7 at that time and the actual temperature. It outputs a signal indicating that the differences are the same, that is, the temperature difference between the set temperature and the actual indoor air temperature is the same as the value instructed by the microcomputer at that time.

The microcomputer 1 receives this signal from the input port _I3 , and executes the heating operation based on the temperature difference sample values output from the output ports _O1 to _O7 at that time.

The above operation continues, and a signal is output from the comparator 5 in accordance with fluctuations in the indoor air temperature.

7 is a contact for starting a program that automatically adjusts the set temperature, and when this contact 7 is turned to the + side, a signal to start automatically adjusting the set temperature is sent to the microcomputer via logic elements 8 and 9. 1
The set temperature is input through the input port _I2 of the controller and automatically adjusted through processing by a microcomputer.

Also, since the signal to start automatic adjustment of the set temperature is logically ANDed with the signal from contact 2 to start heating operation, the signal for automatic adjustment of the set temperature can be turned off and on by switching between cooling operation and heating operation. This is done automatically even if input is continued throughout the year.

Note that C ₁ , C ₂ , C ₃ , and C ₄ are each capacitors, and R ₁ to
R ₈ is a resistor and D ₁ is a diode. In addition, the output port O ₈ of the microcomputer 1 receives the compressor control signal, the output port O ₉ receives the outdoor fan motor control signal, and the output port O ₁₀ controls the control to switch the strength (rotation speed) of the indoor fan motor. output signals for each. Note that an output adjustment circuit is configured by a microcomputer 1, a simple A/D converter circuit consisting of a resistor group 6, and a comparator 5.
The microcomputer 1 also constitutes a compressor control circuit.

The process of automatically adjusting the temperature setting by turning the contact 7 to the + side will be described in detail below. Here, it is assumed that the indoor fan motor is set to "strong". Further, in FIG. 3, it is assumed that during normal cooling and heating operations, the signal output from the output port _O4 is a signal indicating that the difference between the set temperature and the actual detected temperature is O. If the resulting voltage level is equal to the voltage level resulting from the temperature difference between the detected temperature from the temperature detector 4 actually installed and the set temperature by the temperature regulator 3, the comparator 5
The temperature difference between the set temperature and the actual indoor temperature is assumed to be zero and the operation is controlled based on the input from the controller. Also, when the signal from output port O ₃ is output, if the voltage level matches and there is an input from comparator 5, the difference between the set temperature and the actual indoor temperature is +1℃, that is, the indoor temperature is set. It determines that the air conditioner is 1°C higher than the temperature, and controls the air conditioner by operating it if it is cooling or stopping it if it is heating. Also, if when outputting the signal from output port _O5 , there is also an input from the comparator, it will be determined that the indoor temperature is 1°C lower than the set temperature, and if it is in cooling mode, it will stop, and if it is in heating mode, it will stop. If so, control the operation and air conditioner.

However, when contact 7 is turned on and the program for automatically adjusting the set temperature is executed, for example, at the positions marked with * in Figures 1 and 2, there is a temperature difference of 2°C between cooling operation and heating operation. By setting it in advance during the program and making the output signal from output port O ₂ a signal indicating that the difference between the set temperature and the actual detected temperature is zero, the normal settings can be made in the same way as above. Control can be performed at a set temperature that is 2°C higher than the actual temperature.

However, if the indoor fan motor is set to "weak", the temperature at the * mark position in Figures 1 and 2 will be lower than when the indoor fan motor's wind speed is set to "strong". , the indoor temperature distribution deteriorates, and the temperature difference between cooling and heating becomes even larger than 2°C.

In that case, first, a determination signal from the comparator 5 is input to the input port _I3 of the microcomputer 1 to notify that the room temperature distribution has changed.

However, since the step-like voltage timing waveform of the simple A/D converter circuit input to the input side b of the comparator 5 is periodically output, the comparator 5 can directly compare the set temperature and the actual detected temperature. Determine the value for which the difference is zero and output it.

For example, by making the output signal from output port O ₁ a signal that indicates that the difference between the set temperature and the actual detected temperature is zero, it is possible to control the set temperature at a temperature 3°C higher than the set temperature. Become.

As described above, switch the output port that outputs in conjunction with the wind speed control of the indoor fan motor,
By controlling the temperature difference by switching the temperature difference from the setting, it is possible to keep the temperature at the position marked with * in Figures 1 and 2 constant despite the deterioration of temperature distribution due to the wind speed of the indoor fan.

In addition, when switching from heating operation to cooling operation, by connecting contact 2 to the ground side, no signal is input to input port _I2 of microcomputer 1, and this program is stopped.

Therefore, even if you switch between cooling operation and heating operation, in the normal position indicated by * in Figures 1 and 2,
Since the temperatures are corrected to the same value, it is easy to make a guideline for changing the temperature settings thereafter, improving usability. Also, if you display the actual temperature scale on the temperature controller, the value will match the temperature at the fixed position indicated by the * mark, making it very easy to use. Moreover, this control detects the indoor intake air temperature and controls the difference between the set temperature and the actual detected temperature to zero, so even if the air speed of the indoor fan increases or decreases, it is indicated by an asterisk (*). The set temperature is always maintained at a fixed location indoors. In other words, if the wind speed of the indoor blower increases, the distance it can travel becomes longer, and if the wind speed decreases, the distance it travels becomes shorter. The indoor temperature distribution also changes accordingly.

However, since the microcomputer 1 controls the temperature so that the difference between the temperature detected by the temperature detector 4 and the set temperature is zero, the temperature at the position marked with ※ in the room remains unchanged even if the air speed of the indoor fan changes. can be kept at the set value.

As is clear from the above embodiments, the temperature control method for a heat pump air conditioner according to the present invention is as follows:
A switch that switches the operating state of a heat pump air conditioner between cooling and heating operation, a temperature detector that detects the indoor air temperature and outputs an output according to the detected temperature, and a temperature that variably sets the indoor temperature. a regulator, an output adjustment circuit that adjusts the output from the temperature sensor by a predetermined temperature when the switch switches from cooling operation to heating operation, and a compressor control signal according to the signal from the adjustment circuit. A compressor control circuit for outputting the output is provided, and the output adjustment circuit is further connected to a simple A/D converter circuit consisting of a microcomputer and a group of resistors connected to the output port of the microcomputer, and a simple A/D converter circuit of the simple A/D converter circuit. and a voltage comparator that compares the output with the combined output of the temperature detector and the temperature controller and outputs the result to the microcomputer, and the output adjustment circuit compares the detected temperature of the temperature detector and the temperature. The indoor temperature is controlled so that the difference between the set temperatures of the controllers is zero, and the temperature at a predetermined location in the room is the same for both cooling and heating, and when the set temperature is switched from cooling to heating. By automatically adjusting the appropriate temperature, the set temperature is adjusted to the appropriate temperature for heating, so the temperature distribution during heating operation is expanded by the adjusted temperature, making it easier for the user. It is possible to provide conditioned air with appropriate temperature control not only during cooling operation but also during heating operation, without causing discomfort to the user, and even when switching between cooling and heating. There is no need to adjust the temperature each time, and even if temperature adjustment is required, the indoor temperature is corrected to the same temperature, making it easier to estimate the degree of change, improving usability, and making temperature detection easier. The indoor temperature is controlled so that the difference between the temperature detected by the device and the set temperature of the temperature controller is zero, so even if the indoor temperature distribution changes due to increases or decreases in the air speed of the indoor fan, the temperature at the set point in the room remains unchanged. It has various advantages, such as being able to always maintain the set temperature, maintaining comfort without causing discomfort due to excessive or insufficient cooling or heating effects.

[Brief explanation of the drawing]

1 and 2 are vertical temperature distribution diagrams of an air-conditioned space during cooling and heating, respectively. FIG. 3 is an electric circuit diagram showing a temperature control device for a heat pump air conditioner according to an embodiment of the present invention. FIG. 4 is an output waveform diagram showing the output state of the simple A/D converter circuit in the temperature control device. 1...Microcomputer, 2...Contact (switch), 3...Temperature controller, 4...Air temperature detector, 5
...Comparator, 6...Resistor group, _O1 to _O7 ...Output port, _O8 ...Output port for compressor control.

Claims (1)

[Claims] 1. A switch that switches the operating state of the heat pump type air conditioner between cooling operation and heating operation, a temperature detector that detects the indoor air temperature and outputs an output according to the detected temperature, and a variable setting of the indoor temperature. A temperature controller and a composite output of the temperature set by the temperature controller and the temperature of the indoor air detected by the temperature detector when the switch switches from cooling operation to heating operation are used as input to generate a predetermined temperature. and a compressor control circuit that outputs a compressor control signal in accordance with the output signal from the adjustment circuit, and the output adjustment circuit is connected to a microcomputer and the microcomputer. A simple A/D converter circuit consisting of a group of resistors connected to the output port,
A voltage comparator compares the output of the simple A/D converter circuit with the combined output of the temperature detector and temperature controller, and outputs the result to the microcomputer. A heat pump air conditioner that controls the indoor temperature so that the difference between the temperature detected by the temperature detector and the set temperature of the temperature regulator is zero, and the temperature at a predetermined location in the room is the same for both cooling and heating. Temperature control method.