JPH0672713B2 - Air conditioner air-conditioning mode automatic switching method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an air conditioner having a cooling operation function and a heating operation function, and more particularly to a method for automatically switching between cooling and heating modes.

(B) Conventional technology As a conventional automatic switching technology for cooling and heating modes,
There was a thing as described in 72437 gazette. The air conditioner described in this publication detects the outside air temperature, sets the cooling operation mode if the outside air temperature is higher than a predetermined set temperature, and sets the heating operation mode if the outside air temperature is lower than the set temperature. It was a thing. This mode switching is periodically performed at regular time intervals based on the ambient temperature repeatedly detected at regular time intervals from the start of operation. In this way, the operation mode can be reset at regular time intervals to automatically switch between heating and cooling in the morning, daytime, and night of the day.

(C) Problems to be Solved by the Invention In the above-described conventional techniques, the cooling / heating mode is switched based on the change in the outside air temperature, but a temperature detector for detecting the outside air temperature must be provided. However, there was a malfunction depending on the location where this temperature detector was installed. For example, when the sun hits, there were shades, where the air flow was good and where it was bad, and so it was impossible to switch the cooling and heating modes appropriately.

In addition, when the heating / cooling mode is switched based on the outside air temperature, the condition that the user needs cooling or heating and the condition based on the outside air temperature may not match because the user is in the room to be conditioned. , In some cases, it was not possible to switch the air conditioning mode appropriately.

In order to solve such problems, the one described in Japanese Utility Model Laid-Open No. 59-67738 was tried. The one described in this publication selects the cooling / heating mode based on the temperature of the room to be conditioned and the desired set temperature. In this case, when the load in the conditioned room fluctuates temporarily, for example, when the doors are opened or closed or the number of users in the conditioned room increases or decreases, the heating / cooling mode is not necessary according to the temperature fluctuations in the conditioned room. Sometimes changed to.

A method of detecting the temperature of the controlled room at regular time intervals and resetting the heating / cooling mode at regular time intervals by combining the above two conventional techniques is conceivable. If the time when it fluctuates and the above-mentioned constant time coincide with each other, a malfunction may occur as in the case of using the above-mentioned conventional technique.

In view of such a problem, the present invention provides an automatic cooling / heating mode switching method that is capable of automatically switching the cooling / heating mode based on the temperature in the room to be conditioned and that is suitable for the user's experience.

(D) Means for Solving the Problems The present invention is a method for automatically switching between cooling and heating modes of an air conditioner having a cooling operation function and a heating operation function, a first temperature higher than a desired preset temperature by a first predetermined temperature range. And a second temperature higher than the first temperature, a third temperature lower by a second predetermined temperature range than the set temperature, and a fourth temperature lower than the third temperature,
These first to fourth temperatures are used to set the first to fifth regions in order from the highest temperature range, and when the temperature of the conditioned chamber is within the fifth region in the cooling mode or when the temperature of the conditioned chamber is The cooling mode is switched to the heating mode when in the fourth area after the mask for the first predetermined time, and when the temperature of the conditioned room is in the first area or in the heating mode The heating mode is switched to the cooling mode when in the second area after the mask for the second predetermined time.

(E) Action In the above-described method for automatically switching the cooling / heating mode, when the temperature of the room to be conditioned is separated from the desired set temperature by a predetermined temperature range or more and this temperature is maintained for a predetermined time, or the temperature of the room to be conditioned Switches to the heating / cooling mode when the distance is larger than the predetermined time width.

(F) Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic view of an air conditioner using an embodiment of the present invention,
Reference numeral 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. Constitutes a 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 indoor heat exchanger 5 The refrigerant evaporates to cool the room. 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, the refrigerant is condensed in the indoor heat exchanger 5, and the outdoor heat exchanger 3 The refrigerant evaporates to heat the room.

In addition, 7 and 8 are an outdoor air blower and an indoor air blower, respectively, which blow air to the outdoor heat exchanger 3 and the indoor heat exchanger 5.

FIG. 1 is a control circuit diagram of a main part used in the refrigerating cycle shown in FIG. 2 and is configured as follows. A push-type switch 9 outputs a signal for switching the operation start / stop of the air conditioner each time the switch is pressed. Reference numeral 10 denotes a changeover switch for changing over the cooling mode C, the heating mode H, the cooling / heating mode automatic switching C / H, and the air blowing mode F. This changeover switch 10 uses a gray code switch. A room temperature setting device 11 determines a desired set temperature. The setting device 11 is composed of a Gray code switch, and the set temperatures of 18 to 28 correspond to the respective codes.

12 is a microprocessor, such as TI
It contains a program based on the flow chart described below using TMS2600 of the same company. Switch 9, changeover switch 1
0, the pressing and setting state of the room temperature setting device 11, the signal output from the output port R ₁ , R ₃ of the microcomputer 12 input port K ₁ ,
K _2, by scanning with _{K 4, K 8, J 1} , J 2 and enter the microcomputer 12, and to correspond to a particular address stores.

A temperature detector 13 is provided at a position where the internal resistance value changes according to the temperature and the temperature of the room to be conditioned can be detected. The temperature detector 13 has one end connected to the input port A ₃ (analog input terminal) of the microcomputer and the other end connected to the constant voltage power supply V _SS . The microcomputer 12 inputs a current corresponding to the temperature of the room to be conditioned from the input port A _{3 for} each cycle of the program, A / D (analog / digital) converts the data value based on the current value, and stores the data value. At this time, this data value is input a plurality of times, the average value thereof is stored as the temperature value of the room to be conditioned, and the temperature control is performed based on this stored value.

14 to 20 are light-emitting elements for displaying room temperature, 15 ° C and 17 ° C, respectively.
The light emitting element is provided at a position corresponding to the scale of ℃, 19 ℃, 21 ℃, 23 ℃, 25 ℃, 27 ℃, and the light emitting element corresponding to the scale of the value closest to the temperature value of the conditioned room is lit.

Reference numeral 21 denotes a light emitting element for displaying "prevention of cold air", which is turned on when the temperature of the indoor heat exchanger 5 shown in FIG. 1 is below a predetermined value during heating operation. This temperature is the same as the method for inputting the temperature value of the room to be conditioned
Inputting from input port A ₄ .

Reference numerals 23, 24, and 25 are light emitting elements for displaying "cooling / heating mode automatic switching", "cooling mode", and "heating mode", respectively, which are provided near these displayed characters. These light emitting elements
23, 24 and 25 are turned on according to the set value of the changeover switch 10.
Incidentally, when the changeover switch 10 is set to the "blower mode F", the light emitting element 24 for displaying the "cooling mode" is turned on.

The light emitting elements 14 to 21 and the light emitting elements 23 to 25 are microcomputers.
The 12 output ports R _{0 to} R ₃ and the display ports 0 _{0 to} 0 ₆ are used for dynamic lighting. Incidentally, 26
Reference numerals 29 to 29 are inverter circuits.

Reference numerals 30 to 33 are relays, which respectively control the energization of the compressor 1, the indoor blower 8, the outdoor blower 7, and the four-way valve 2 shown in FIG. These relays 30 to 33 have output ports of the microcomputer 12 at one end through inverter circuits 34 to 37, respectively.
Is connected to _{R 8, R 12, R 10} , R 9, connects the other end to the constant-voltage circuit of DC24 [V].

38 is an oscillator circuit, which consists of a crystal oscillator, a resistor, and a capacitor.
It is given to OCS1 and OCS2.

A normal power supply circuit can be used as the constant voltage circuit that outputs the constant voltages V _SS , DC24, V _ASS , and V _REF, and the description thereof will be omitted. The V _ASS and V _REF are the upper limit voltage and the lower limit voltage of the A / D conversion operation of the microcomputer 12. Further, the terminal INLT is a power reset terminal, and inputs a signal for resetting the microcomputer 12 when the power is turned on. This signal may be any signal that is output when the output of the power supply circuit exceeds a certain voltage value when the power is turned on.

FIG. 3 is a flowchart of the main part of the microcomputer 12 which operates as described above. The operation will be described below based on this flowchart. Switch 9 by key scan,
Press the switch 10 or the room temperature setting device 11 or input the setting state. Next, the operating state of the compressor 1 is determined. That is, the timing is started from the time when the compressor 1 is switched from the ON state to the OFF state, and this timing is maintained while the compressor 1 is in the OFF state,
When the clock time reaches 2 hours, the memory is re-initialized to erase the memory of the cooling mode and the heating mode. When the operation of the compressor 1 is performed again for 2 hours or more, the time measurement is started again when the compressor 1 is stopped. Next, the temperature t of the room to be conditioned and the coil temperature
Enter t ₀ (the temperature of the indoor heat exchanger 5).

Next, when the pressing of the switch 9 is confirmed in the scan operation, the start / stop of the air conditioner is switched. This activation is performed after performing the operation of "operation mode confirmation" as shown in FIG. This "operation mode confirmation" is to set the cooling / heating mode at the start of operation of the air conditioner.
First, the state of the air conditioner is set from the stopped state to the ON state. Next, it is determined which mode the changeover switch 10 is in. If it is in the automatic mode, it is determined whether or not the cooling / heating mode is stored, and if the mode is stored, the mode is followed. That is, before the re-initialization is performed, the previous operation mode is maintained. If the mode is not stored after the re-initialization, the cooling mode or the heating mode is set based on the vertical relationship between the temperature T set by the room temperature setting unit 11 and the temperature t of the room to be conditioned.

After the operation of the air conditioner is started in this way, the mode of the changeover switch is determined again, and then the operation is performed in each mode. When the temperature t of the room to be conditioned is set to t = 10 (minimum detected temperature value, t = 10 even when a value below this temperature value is detected) during cooling operation, the minimum setting of the room temperature setting device 11 Since the temperature is 18 ° C., the cooling operation by driving the compressor 1 is not performed, and only the blowing operation is substantially performed. Further, at the time of heating operation, the temperature t ₀ of the indoor heat exchanger 5
Is detected and the defrosting operation is performed.

FIG. 5 is a flow chart showing the operation of "mode automatic setting", and operates as follows. First, if the compressor 1 is operating, the cooling operation or the heating operation is performed as it is. When the compressor 1 is stopped (OFF state), the timer starts counting. Next, the temperature t of the room to be conditioned is (set value T)
When +3.0 or more, that is, when “t ≧ T + 3.0”, the cooling mode is set regardless of the current operation mode.
When "t≥T + 1.5" and the timer times up, the cooling mode is set in the same manner. When "t≤T-3.0", the heating mode is set regardless of the current operation mode, "t≤T-1.5", and the timer is up.
When you do, set the heating mode as well. The timer resets and starts when the compressor 1 changes from the ON state to the OFF state, and the time measured by this timer is set to about 1 hour. Further, when the timer starts counting time, the temperature t is t ≧
The same effect can be obtained even when the process is started when T + 1.5 or t ≦ T-1.5.

With the air conditioner configured as described above, the changeover switch 10
The switching state of the cooling / heating mode when the is set to the automatic mode will be described with reference to FIG. When the switch 9 is pressed to start the operation at the time h ₀ , the temperature t at this time is higher than the set temperature T, so the cooling operation is performed. During this period from h ₀ to h ₁ , the thermocycle operation in which the temperature t of the room to be conditioned and the set temperature T are compared is performed. Occurs and the outside air temperature decreases from the time of the time h _1, and the operation mode is Setsu換Ri in heating mode the temperature t is "t ≦ T-3.0" after a short time (time h _2), starting the heating operation To do. Then, until the time h ₃ performs the thermo-cycle operation of the heating in the same manner as in the cooling. Times of Day
The outside air temperature rises again from the time of h ₃ , and the temperature t of the conditioned room becomes stable under the condition of “t ≧ T + 1.5”. At this time, when the timer goes up at time h ₄ , the operation mode is switched from the heating mode to the cooling mode and the cooling operation is restarted. In this way, when the temperature t of the room to be conditioned is "| t-T | ≥1.5" even after a predetermined time, or when the temperature t is "| t-T | ≥3.0", the operation mode is switched. Therefore, when the temperature changes momentarily, the masking operation by the timer works to prevent erroneous switching of the operation mode. When the temperature fluctuation range is large, the operation mode can be switched regardless of the masking operation of the timer.

The cooling / heating mode is maintained for a certain period of time after the compressor 1 is stopped, and when the switch 9 or the changeover switch 10 is operated to stop the operation of the air conditioner or the compressor, the operation is restarted when the operation is restarted. Is used.

(G) Effect of the Invention As described above, the present invention is the first temperature higher than the desired preset temperature by the first temperature in the automatic switching method of the cooling and heating modes of the air conditioner having the cooling operation function and the heating operation function. A second temperature higher than the first temperature, a third temperature lower by a second predetermined temperature range than the set temperature, and a fourth temperature lower than the third temperature are determined, and the first to fourth temperatures are used to select from the high temperature range. First to fifth regions are set in order, and when the temperature of the controlled chamber is in the fifth region in the cooling mode or the temperature of this controlled chamber is in the fourth region after the mask for the first predetermined time. Sometimes this cooling mode is switched to a heating mode, and when the temperature of the conditioned room is in the first area in the heating mode or when the temperature of the conditioned room is in the second area after the mask for the second predetermined time. Since this heating mode is switched to the cooling mode,
A mask for the first or second predetermined time is provided, and an erroneous operation of the cooling / heating switching can be suppressed by the instantaneous temperature fluctuation occurring within this time, and the temperature of the controlled room is in the first region or the fifth region.
When a sudden change occurs until reaching the area, optimum cooling / heating operation can be performed by switching the cooling / heating mode regardless of the mask time.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a control device using an embodiment of the present invention, FIG. 2 is a schematic diagram of an air conditioner using the control device shown in FIG. 1, and FIGS. FIG. 6 is a flowchart showing the operation of the main part of the microprocessor shown in FIG. 6, and FIG. 6 is an explanatory diagram showing the cooling / heating switching operation of the control device shown in FIG. 9 ... Switch, 10 ... Changeover switch, 12 ... Microcomputer.

Claims (3)

[Claims] 1. A method for automatically switching between a cooling mode having a cooling function and a heating function to perform a cooling operation and a heating mode to perform a heating operation, wherein a first temperature higher than a desired preset temperature by a first predetermined temperature range and a first temperature A second temperature higher than the first temperature, a third temperature lower by a second predetermined temperature range than the set temperature, and a fourth temperature lower than the third temperature are defined, and a range of higher temperatures is determined using these first to fourth temperatures. First to fifth areas are set in order from
When the temperature of the controlled room is in the fifth region in the cooling mode, or the temperature of the controlled room is the fourth after the mask for the first predetermined time.
The cooling mode is switched to the heating mode when the temperature is in the area, and the temperature of the conditioned room is in the first area in the heating mode or when the temperature of the conditioned room is the second after the mask for the second predetermined time. An automatic air conditioner cooling / heating mode switching method characterized by switching this heating mode to a cooling mode when in an area. 2. The timed start of the first predetermined time or the second predetermined time starts when the temperature of the controlled room reaches the second region or the fourth region. The automatic switching method of the air conditioning mode of the air conditioner of Claim 1. 3. The air according to claim 1, wherein the start of timing of the first predetermined time or the second predetermined time starts when the cooling or heating of the room to be conditioned is stopped. How to automatically switch between air conditioning and heating modes for a harmony machine.