JPH0233553A - Automatic switching of cooling heating mode of air conditioner - Google Patents

Abstract

PURPOSE:To enable prevention of frequent switching of cooling and heating modes therebetween to be compatible with switching of cooling and heating modes therebetween to meet the will of a user by a method wherein when a motion to switch the respective modes is effected, maintenance for a specified time is not performed. CONSTITUTION:In a step S7, it is decided whether a compressor 1 is run, and when the compressor 1 is run, the step is progressed to a step S8, and cooling or heating operation is effected as it is. When the compressor 1 is stopped (turned OFF), in a step S9, a timer is reset at R and started only when the compressor 1 is switched from an ON-state to an OFF-state. In a step S10, when a temperature (t) of a room to be air-conditioned exceeds (set value T) + 3.0, namely, in the case of 't>=T+3.0', a cooling mode is set irrespective of a present operation mode. In the case of 't>=T+1.5' and when a timer is timed UP, a cooling mode is also set in a similar manner described above. In the case of 't<=T-3.0', a heating mode is set irrespective of a present operation mode, and in the case of 't<=T-1.5' and when a timer is timed UP, a heating mode is also set in a similar manner described above.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an air conditioner having a cooling operation function and a heating operation function, and particularly relates to switching between cooling and heating modes.

(b) Conventional technology The conventional automatic switching technology for heating and cooling modes was developed in 1982.
There was one as described in Japanese Patent No.-72437. The air conditioner described in this publication detects the outside air temperature, and if this outside air temperature is higher than a predetermined set temperature, it sets the cooling operation mode, and if this outside air temperature is lower than the set temperature, it sets the heating operation mode. It was something. This mode switching was performed periodically at regular intervals based on the outside air temperature that was repeatedly detected at regular intervals from the start of operation. In this way, by resetting the operating mode at regular intervals, it was possible to automatically switch between heating and cooling during the morning, noon, and night of the day.

(c) Problems to be Solved by the Invention In the conventional technology described above, the heating and cooling mode was switched based on changes in the outside air temperature, but it was necessary to include a temperature detector to detect the outside air temperature. , Malfunctions may occur depending on the location where this temperature sensor is installed (for example, in sunlight, in the shade, in a place with good air flow, or in a location with poor air flow).
In some cases, it was not possible to change the heating and cooling mode appropriately.

Additionally, when switching between heating and cooling modes based on outside temperature, the conditions under which the user requires cooling or heating may not match the conditions based on outside temperature because the user is in a conditioned room. In some cases, the heating and cooling mode could not be switched appropriately.

In order to solve these problems, a method as described in Japanese Utility Model Application Publication No. 59-67738 was attempted. The system described in this publication selects the heating and cooling mode based on the difference between the temperature of the room to be conditioned and a desired set temperature. In this case, when the load in the conditioned room changes temporarily,
For example, when a door is opened or closed or the number of users in the room to be conditioned increases or decreases, the heating and cooling mode may change unnecessarily in accordance with the temperature fluctuations in the room to be conditioned.

It is possible to combine the above two conventional techniques to detect the temperature of the conditioned room at regular intervals and reset the heating/cooling mode at regular intervals, but even with this method, the load may be temporarily reduced. If the time of fluctuation coincides with the fixed time, there are cases where the same operation as when using the above-mentioned conventional technique occurs.

In addition, if the cooling/heating mode is maintained for at least a certain period of time, even if the selection switch for cooling mode, heating mode, or automatic mode is changed, the cooling mode or heating mode will remain unchanged until the certain period of time has elapsed. Air conditioning in the new mode that has been maintained and switched may not be performed immediately, which may result in operation contrary to the user's wishes.

In view of these problems, the present invention provides an automatic heating and cooling mode switching method that can prevent frequent switching of heating and cooling modes and switch the heating and cooling mode according to the user's wishes.

(D) Means for Solving the Problems The present invention has at least three modes: a cooling mode for performing cooling operation, a heating mode for heating operation, and an automatic mode for automatically changing the cooling mode or heating mode. In an automatic cooling/heating mode switching method that maintains the cooling mode or the heating mode in each mode for at least a certain period of time when automatically switching between the cooling mode and the heating mode, when the operation of changing each mode is performed, It does not require maintenance.

(*) Effect The automatic heating and cooling mode switching method configured as described above maintains each mode for at least a certain period of time before switching between heating and cooling modes, thereby suppressing frequent switching between modes, and When the mode is switched at will, the mode can be switched quickly.

(f) Examples Examples of the present invention will now be described based on the drawings. FIG. 2 is a schematic diagram of an air conditioner using an embodiment of the present invention,
1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger, 4 is a capillary tube, 5 is an indoor heat exchanger, and 6 is an accumulator, and these elements are sequentially connected in a ring with refrigerant piping. make up the refrigeration cycle. When the four-way valve 2 is in the state shown by the solid line in the figure, the refrigerant discharged from the compressor 1 flows as shown by the solid line arrow, the refrigerant is condensed in the outdoor heat exchanger 3, and the refrigerant is condensed in the indoor heat exchanger 5. When the refrigerant evaporates and cools the room, and when the four-way valve 2 is in the state shown by the dotted line in the figure, the refrigerant discharged from the compressor 1 flows as shown by the dotted arrow, and the indoor heat exchanger 5 The refrigerant condenses and evaporates in the outdoor heat exchanger 3, heating the room.

Note that 7 and 8 are an outdoor fan and an indoor fan, which blow air to the outdoor heat exchanger 3 and the indoor heat exchanger 5, respectively.

FIG. 1 is a main part control circuit diagram used in the refrigeration cycle shown in FIG. 2, and is constructed as follows. Reference numeral 9 denotes a push-button switch, which outputs a signal to switch between starting and stopping the air conditioner each time it is pressed. Reference numeral 10 denotes a changeover switch, which switches between cooling mode C1, heating mode H1, automatic mode C/H, and ventilation mode F.

This changeover switch 10 uses a gray foot switch. Reference numeral 11 denotes a room temperature setting device, which determines a desired set temperature. The temperature setting device 11 consists of a gray foot switch, and 18 to 28 set temperatures correspond to each code.

12 is a microprocessor (microcomputer), which stores a program based on a flowchart described later.

The pressing and setting states of the switch 9, changeover switch 10, and room temperature setting device 11 are determined by the output ports R+ and Rs of the microcomputer 12.
The signals output from the input ports are connected to +, *, -, and K.
A, J+, and J* are scanned, and the microcomputer 12 inputs the data and stores it in correspondence with a specific address.

Reference numeral 13 denotes a temperature detector whose internal resistance value changes depending on the temperature, and is provided at a position where it can detect the temperature of the conditioned room. This temperature detector 13 has one end connected to the input port A (analog input terminal) of the microcomputer, and the other end connected to the constant voltage power supply vsi. The microcomputer 12 inputs a current corresponding to the temperature of the room to be conditioned from the input capacitor 1-A every cycle of the program, converts the data value based on this current value into A/D (analog/digital), and stores it. do.

At this time, this data value is input a plurality of times, the average value is stored as the temperature value of the conditioned room, and temperature control is thereafter performed based on this stored value.

14 to 20 are light emitting elements for displaying room temperature;
℃, 17℃, 19℃, 21℃, 23℃.

A light emitting element is provided at a position corresponding to a scale of 25° C. and 227° C., and the light emitting element corresponding to the scale closest to the temperature value of the conditioned room lights up.

Reference numeral 21 denotes a light emitting element for displaying "cold air prevention", which lights up when the temperature of the indoor heat exchanger 5 shown in FIG. 1 is below a predetermined value during heating operation. This temperature is input from the input port A4 of the microcomputer 12 using the same method as the method for inputting the temperature value of the conditioned room for the temperature detector 22.

23, 24, and 25 are light emitting elements for displaying "mode", "cooling mode", and "heating mode", respectively, and are provided near these display characters.

These light emitting elements 23, 24, 25 are connected to the changeover switch 10.
Lights up according to the setting value. It should be noted that the selector switch 10 is “
When set to "air blowing mode F", the light emitting element 24 for displaying "cooling mode" lights up.

The light emitting elements 14 to 21 and the light emitting elements 23 to 25 are connected to the output ports R0 to R8 of the microcomputer 12 and the display port 0.
．． Dynamic lighting is performed using O1 to O1. Note that 26 to 29 are inverter circuits.

Relays 30 to 33 control the energization of the compressor 1, the indoor blower 8, the outdoor blower 7, and the four-way valve 2 shown in FIG. 1, respectively. These relays 30 to 33 are connected to output ports R1, R1**, R++, and R6 of the microcomputer 12, respectively, and the other ends are connected to a constant voltage circuit of DC 24 [■].

An oscillation circuit 38 is composed of a crystal oscillator, a resistor, and a capacitor, and supplies the microcomputer 120 reference clock to the input ports 0C8I and 0C32.

In addition, constant voltage Vss, DC24, VASS, V
Since a normal power supply circuit can be used as the constant voltage circuit that outputs IIIF, the explanation thereof will be omitted.

3 and 4 are explanatory diagrams showing the main operations of the microcomputer 12 shown in FIG. 1. In FIG. 3, the setting states and temperature values of each switch are input in step SI. In step S, it is determined whether the changeover switch 10 is selected as "automatic mode", "cooling mode", "heating mode 4", or "none of the modes, that is, ventilation mode", and the respective steps are performed in step S. Mode automatic setting, proceed to cooling operation by step S, heating operation by step S, ventilation operation by step S, step S4,
For cooling operation and heating operation in step S, temperature sensor 1 is used.
The blowing operation in step S is performed by comparing the temperature value detected in Step 3 with the set value of the room temperature setting device 11 to control the operation of the compressor 1. only.

FIG. 4 is an operational explanatory diagram showing the main operations of step Ssr mode automatic setting shown in FIG.

First, in step S, it is determined whether or not the compressor 1 is operating, and if the compressor 1 is operating, the process proceeds to step S, where cooling operation or heating operation is performed, and the compressor 1 is stopped (OFF). At step S, compressor 1 is turned on →
The timer is reset (R) and started only when switched to OFF.

Next, step S1. Then, the temperature t of the conditioned room is (set value T
)+3.0 or more, that is, when "t≧T+3°0", the cooling mode is set regardless of the current operating mode. “t≧T+1.5” and the timer is time U
Pt, set the cooling mode in the same way. Also “t
≦T-3,0'', the heating mode is set regardless of the current operation mode, and 't≦T-1,5'',
Also, when the timer times out, the heating mode is set in the same way. Note that the time measured by the timer is set to about 1 hour. Also, when the timer starts counting, the temperature t is “t≧T”.
A similar effect can be obtained by starting from the time when t≦T−1°5” or t≦T−1°5”.

By using the automatic cooling/heating mode switching method configured as described above, the changeover switch 10 can be set to "automatic mode".
When , the temperature t is compared with the set price to switch between the cooling mode and the heating mode, and the same mode is maintained for at least one hour as determined by the timer. When the changeover switch 10 is changed from automatic mode to cooling mode, heating mode or blowing mode, cooling mode to heating mode to blowing mode, the cooling mode, heating mode and blowing mode are quickly switched.

(G) Effects of the Invention The present invention has at least three modes: a cooling mode for performing cooling operation, a heating mode for heating operation, and an automatic mode for automatically changing the cooling mode or heating mode. In an automatic cooling/heating mode switching method that maintains the cooling mode or heating mode in the same mode for at least a certain period of time when automatically changing the mode, when each mode is changed, the mode is maintained for the certain period of time. Therefore, when in automatic mode, the same mode is maintained for at least a certain period of time to prevent frequent mode switching, and when the user changes modes, the mode is quickly changed to meet the user's wishes. Air conditioning operation is performed.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram for explaining one embodiment of the method according to the present invention, Fig. 2 is a refrigeration cycle diagram of an air conditioner that can be controlled by the electric circuit diagram shown in Fig. 1 is an explanatory diagram showing the main operations of the microcomputer shown in FIG. 1, and FIG. 4 is an explanatory diagram of the operation of step S shown in FIG. 3. 1... Compressor, 10... Selector switch, 1
2...Microcomputer.

Claims (1)

[Claims] (1) It has at least three modes: a cooling mode for cooling operation, a heating mode for heating operation, and an automatic mode for automatically changing between cooling mode and heating mode, and when automatically changing between cooling mode and heating mode. , an automatic cooling/heating mode switching method configured to maintain the cooling mode or the heating mode in the same mode for at least a certain period of time, characterized in that when the respective modes are changed, the mode is not maintained for the certain period of time. How to automatically switch between heating and cooling modes in an air conditioner.