JPS5938495B2 - Automatic operation control method for heat pump air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic operation control method for a heat pump type air conditioner.

As shown in FIG. 1, a general heat pump type air conditioner has a refrigerant circuit 6 in which a compressor 1, a four-way valve 2, a user side heat exchanger 3, a pressure reducing device 4, and a heat source side heat exchanger 5 are connected. By switching the four-way valve 2, the refrigerant flows in the direction of the solid arrow during cooling operation, and in the direction of the broken arrow during heating operation, forming a cooling cycle and a heat pump heating cycle.

Note that reference numerals 1 and 8 are a user side blower and a heat source side blower that promote heat exchange in the heat exchangers 3 and 5, respectively.

Then, the air in the air-conditioned room (not shown) is transferred to the user-side heat exchanger 3.
Cooled or heated by

When controlling such an air conditioner, conventionally, a switching command is issued to the four-way valve 2 according to the closed position of a heating/cooling switch (not shown) to select cooling operation or heating operation, and to control the temperature of the air-conditioned room. By comparing the temperature with the set temperature, a start/stop command is issued to the compressor motor (not shown).

However, when there is a large diurnal change in temperature, such as in spring and autumn, cooling operation may be required during the day and heating operation may be required at night, which is cumbersome as the cooling/heating switch must be changed each time.

In order to solve this problem, a thermosensor is used as in Japanese Utility Model Application Publication No. 49-29753 to detect the room temperature in degrees Celsius, and when the room temperature rises to a preset temperature t6, the cooling operation is started, and the set temperature L
A method has been proposed in which heating operation is started when the temperature drops to 1, but in this method, the set temperature t1 It2
The heating/cooling start switching temperature is fixed, and the temperature sensation of the human body varies throughout the year, which not only makes it impossible to obtain appropriate heating/cooling control, but also limits the temperature control range of the air-conditioned room. had.

The present invention solves the above-mentioned drawbacks by providing a predetermined range for the start temperature of the cooling operation and the heating operation, respectively. The start/stop control temperature of the compressor motor having a The automatic operation control method for a heat pump air conditioner is equipped with a judgment function that selects and instructs one of the heating operations, so that comfortable air conditioning can be obtained throughout the year, and at the time of startup, the temperature of the air-conditioned room is set to the above-mentioned level. cooling directive,
The purpose is to enable operation according to any command immediately even when the control temperature of the heating command is not reached and the operating temperature of the compressor motor has been reached. It is suitable for a control device using a large-scale integrated circuit)'P microcomputer.

The method of the present invention will be explained below based on the drawings.

Fig. 2 shows a control device incorporating this method, and numeral 9 indicates a set value Tx arbitrarily adjusted by an operating lever etc.
A temperature setting device that converts into a 0-decimal number (BCD code), 10 and 11 are a room temperature sensor and an outside temperature sensor that measure the air-conditioned room temperature and outdoor temperature as analog voltage quantities, respectively, and 12 is a 1
．． 13 and 14 are amplifiers that amplify the sensor output, 15 is an A-D (analog-digital) converter that converts the amplifier output into a digital quantity, and 16 is an A-D converter 15. This is an input adjustment device for supplying the output from the operation switch 12 to the human power port of the microcomputer 17 at the next stage.
Includes IJ-switch, FBCD conversion device, etc.

Microcomputer J17 & 13 As shown in the figure, an AL with an input/output interface 18 and calculation and comparison functions.
A CPU (central processing unit) 19 consisting of a logic operation unit (U), an accumulator, a register, a counter, etc., a ROM 20 for program memory, and a data storage system.
It is a several-chip or one-chip LSI consisting of a RAM 21 for memory.

Note that 22 is a clock generator 1 which determines the unit operating time of the microcomputer 170.

The microcomputer J17 receives the programs and data stored in the ROM 20 JPRAM 21 when the operation switch 12 is turned on, the setting signal from the temperature setting device 9, and each sensor i.
A control command is issued from the output port to the output adjustment device 23 in accordance with the input signals from o and 1i.

The output adjustment device 23 has a rotary switch -'PBCD.
It includes a toiO conversion device, etc.

The signal from the output adjustment device 23 is distributed to amplifiers 24 to 228, and is sent to the room temperature display device 29, the compressor motor control relay CMR1, and the user-side blower motor control relay FMR1.
The motor control relay FMOR for the heat source side blower, the four-way valve control relay 30, etc. are controlled.

The BCD code from the temperature setter 9 is converted into a decimal number by a BCDtolO converter 31, and then amplified by an amplifier 32 to drive a set temperature display device 33.

An example of operation in which the control device shown in FIG. 2 is applied to the heat pump type air conditioner shown in FIG. 1 will be described with reference to FIG. 4.

In FIG. 4, Tx is the set temperature adjusted by the temperature setting device 9, and the control temperature is 0.5°C added or subtracted from TA s TB H T X, THs TL &'Jr, 2
．． The microcomputer 17 adjusts and subtracts a pre-stored constant (0, 5, 2, 5) from the input value from the temperature setting device 9 to determine the control temperature by adding or subtracting 5°C, and stores this. ing.

Therefore TA. TB s Each control temperature of TH and TL is adjusted in conjunction with Tx within the adjustable range of Tx, and always has a relationship of TH>TA>TB>TL, and TA-TB-1 ℃, TH-TL-5℃.

T), 't TB is used as the on/off control temperature of the compressor motor (not shown) during cooling operation, and the off/on control temperature during heating operation, and TH* TL is the cooling command. , used as the control temperature for heating commands.

Now, at time t1, the operation switch 12 is turned on, and when the room temperature TR detected by the sensor 10 is lower than TL, the microcomputer 17 issues a heating command and the four-way valve control relay 30 is energized.

At this time, since T8<TB, the compressor Mole control relay CMR is also energized, and the refrigerant circuit 6 starts a heating cycle in which the compressor 1 operates, the four-way valve 2 switches, and the refrigerant flows in the direction of the dashed arrow. Become.

Further, control relays F'MR and FMPR are energized, each blower 7.8 is also operated, and the air conditioner performs heating operation using a heat pump method.

Heats the air in the conditioned room.

From then on, the air conditioner is controlled based on the heating program, and when the room temperature reaches the control warm temperature TA, the compressor
Control relay CMR is demagnetized and compressor 1 is stopped, and as a result, when the room temperature decreases and reaches TB, control relay CMR is demagnetized.
is energized.

In this way, the °C compressor 1 is operated intermittently, and the room temperature TR
is approximately maintained within the range of the set temperature Tx±0.5°C.

After the room temperature TR exceeds the control temperature TA at time t2 and the heating operation is stopped, the room temperature continues to rise further due to a rise in outdoor temperature, for example, and exceeds the control temperature TH at time t3. issues a cooling command, and the four-way valve control relay 30 is demagnetized.

Based on the cooling program, since TR>TB, the compressor motor control nIJ relay CMR is energized.
The refrigerant circuit 6 forms a cooling cycle in which refrigerant flows in the direction of the solid arrow, and the air conditioner performs cooling operation.

As a result, when the room temperature falls and reaches the control unit 1fITB, the compressor 1 stops, and when the room temperature rises and reaches the control temperature TA, the compressor 1 resumes operation, so the cooling operation continues and the room temperature TR is approximately The set temperature Tx is maintained at ±0.5°C.

Moreover, after the room temperature TR falls below TB, it further falls.

When the temperature falls below the control temperature TL at time t4, the microcomputer 17 issues a heating command, and the air conditioner performs heating operation.

The above operation is repeated unless the operation switch 12 is opened.

Next, a case where the room temperature TR is TL<TR<T□ at the time of initial startup will be described.

At this time, if the room temperature is TB≦TR≦TA, it is almost equal to the set temperature, so compressor 1 does not operate and neither cooling nor heating operation is performed, but the room temperature is maintained almost at the set temperature and there is no problem. .

Then, if the room temperature is TA<TR<TH, TL<TR
<TB, the microcomputer 17 stores a program based on the flowchart shown in FIG.
FF), in the latter case, the heating command (four-way valve ON) is selected and the room temperature can be quickly brought close to the set temperature.

Whether or not it is the initial start time can be determined by, for example, whether or not the user-side blower motor control relay FMR is energized.

A program based on the flowcharts shown in FIGS. 6 and 7 may be stored in the microcomputer J17 as means for determining whether to perform the cooling operation or the heating operation at the time of initial startup.

That is, in FIG. 6, the outdoor temperature T is determined by the outdoor temperature sensor 11.
Set temperature TOD' where OD is detected and stored in advance
It is determined whether the above conditions are met and one of the cooling and heating operations is selected.

In FIG. 1, only when the four-way valve control relay 30 is energized when stopping the air conditioner, this is stored in the memory.

Then, the next time the engine is operated, it is determined whether it is stored in the memory or not, and if it is stored, a heating command is issued, and if it is not, a cooling command is issued, so that the system is started in the same state as the previous time.

In both of these equations, the room temperature is TB ≦TR≦TA
In the same way as described above, the compressor 1 does not operate.

As described above, the present invention provides a control temperature TAs determined by adding or subtracting a constant to the set value Tx adjusted by the warm setting means.
TB (TA>TB) is the starting/stopping control degree of the compressor motor, and the control unit #TH9TL (TEl>TL), which is determined by adding or subtracting a constant larger than the above constant, controls the cooling command and the heating command, respectively. Based on the judgment function that inputs at least one of the room temperature, outside temperature, and previous operating status at the time of initial startup, the system selects either cooling operation or heating operation. Even in beds where the daily temperature changes drastically, cooling or heating is automatically performed to maintain the temperature of the conditioned room near the set value.
Comfortable air conditioning can be expected throughout the year, and the temperature of the conditioned room does not reach the control temperature of the cooling command or heating command at the time of startup.
In addition, even when the operating temperature of the compressor mold has been reached, X is performed by any command to create a dead zone (not only can each control temperature be automatically adjusted based on one set value Tx) The present invention provides a useful automatic operation control method for a heat pump type air conditioner, which is effective for simplifying peripheral devices, especially when a microcomputer is used.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram showing an example of a heat pump air conditioner to which the present invention is applied; FIG. 2 is a block diagram showing an example of a control device for a heat pump air conditioner incorporating the method of the present invention; Figure 3 is a block diagram showing the configuration of the microcomputer used in Figure 2, Figure 4 is an explanatory diagram for explaining this method, and Figures 5 to 7 are for explaining a part of this method. FIG. 9... Temperature setting device, 10... Room temperature sensor, 11...
・Outside temperature sensor, 11...Microcomputer 11C
MR...Compressor motor control relay, 30...Four-way valve control relay.

Claims (1)

[Claims] 1 Control temperature TA* TB determined by adding or subtracting a constant to the set value Tx adjusted by the temperature setting means (TA>TB
) is the start/stop control temperature of the compressor motor, and the control temperature TH is determined by adding or subtracting a constant larger than the above constant.
t TL (Tl (>TL) is the control temperature of the cooling command and heating command, respectively. At the initial startup, when the temperature of the conditioned room TR is TH>TR>TA, the cooling command and TB>T are set.
An automatic operation control method for a heat pump type air conditioner, characterized in that one of cooling operation and heating operation is selected based on an instruction from a judgment function that issues a heating command when R>TL.