JP2002267280A - Controller and controlling method of air conditioner, and recording medium recorded with control program of the air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce waiting power without shortening the time elapsed until starting power supply very much, even when the outdoor air temperature is low. SOLUTION: A system comprising a compressor 1, a crankcase heater 2, a microcomputer 3, a program memory 4a, a delivery temperature sensor 5, and an outdoor air temperature sensor 6 is provided with means for supplying power to the crankcase heater, when the difference between the delivery temperature of the compressor and the outdoor air temperature becomes equal to or lower than a specified value during stoppage of the compressor. Since the stat of power supply can be determined depending on the outdoor air temperature, the time elapsed until the start of power supply does not become very short, even when the outdoor air temperature is low and so that waiting power can be reduced, while prolonging the lifetime of the crankcase heater.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner, which controls energization of a crankcase heater mounted on a compressor.

[0002]

2. Description of the Related Art A conventional air conditioner control device for controlling energization of a crankcase heater mounted on a compressor is disclosed in Japanese Utility Model Laid-Open No. 1-178562.

Hereinafter, the conventional air conditioner control device will be described with reference to the drawings.

FIG. 14 is a control circuit diagram of a conventional air conditioner control device. In FIG. 14, 2 is a crankcase heater wound around a compressor (not shown), 5 is a discharge temperature sensor for detecting the discharge temperature of the compressor, and 11 is a compressor operation relay for driving the compressor. , A normally open contact (not shown) that is turned on to operate the compressor when energized,
And N normally closed contacts 12. Reference numeral 13 denotes a compressor control device for controlling the operation of the compressor. Reference numeral 15 denotes ON of the crankcase heater 2 based on the discharge temperature detected by the discharge temperature sensor 5.
Crankcase heater control device for performing (energization) -OFF (non-energization), and 16 and 17 are power supply lines.

As shown in FIG. 14, a compressor control device 13 for controlling the compressor operation relay 11 is connected to the compressor operation relay 11, and a normally closed contact is provided between the two wires 16 and 17 of the power supply. 12 and the crankcase heater 2 are connected in a series circuit, and a crankcase heater control device 15 is connected to the crankcase heater 2.

[0006] The operation of the air conditioner control device configured as described above will be described below.

When a stop signal is output from the compressor control unit 13, the compressor operation relay 11 is demagnetized and the normally closed contact 12
Is closed, but the crankcase 2 is energized by the crankcase heater control device 15 only when the discharge temperature is lowered to a predetermined temperature by the detection of the discharge temperature sensor 5.

[0008]

However, in the above-described conventional configuration, the crankcase heater control device 15 controls the power supply to the crankcase heater 2 only by the discharge temperature. There is a disadvantage that the time becomes extremely short and the amount of reduction in standby power is reduced.

The present invention has been made to solve the conventional problems, and an air conditioner control device capable of reducing the standby power even when the outside air temperature is low without extremely shortening the time until the start of energization. The purpose is to provide.

Further, in the above-mentioned conventional configuration, the crankcase heater control device 15 controls the power supply to the crankcase heater 2 irrespective of the refrigerant holding state in the outdoor unit.
Even when the amount of refrigerant held in the compressor is large, power is not supplied, and the frequency of occurrence of liquid compression in the compressor increases.

Another object of the present invention is to provide an air conditioner control device capable of reducing standby power without increasing the frequency of occurrence of liquid compression in the compressor.

Further, the above-mentioned conventional configuration has a disadvantage that when the discharge temperature sensor 5 comes off or fails, the crankcase heater is not energized, and the compressor is compressed.

Another object of the present invention is to control an air conditioner capable of preventing the occurrence of liquid compression in a compressor and reducing standby power even in the event of a disconnection or failure of a discharge temperature sensor. It is to provide a device.

In addition, the above-mentioned conventional configuration erroneously detects when the detection value of the discharge temperature sensor 5 is near the determination value or when water drops on the discharge temperature sensor 5 and the detection value temporarily decreases. There is a disadvantage that the power supply to the crankcase heater is started.

Another object of the present invention is to erroneously control the crankcase heater when the detected value of the discharge temperature sensor is near the determination value or when the detected value is temporarily lowered due to water dripping on the sensor. An object of the present invention is to provide an air conditioner control device capable of preventing the start of energization and reducing standby power.

[0016]

According to a first aspect of the present invention, there is provided a means for supplying electricity to a crankcase heater when a difference between a discharge temperature of a compressor and an outside air temperature becomes a predetermined temperature or less when the compressor is stopped. It is a thing.

Further, the invention according to claim 2 is provided with a procedure for energizing the crankcase heater when the difference between the discharge temperature of the compressor and the outside air temperature becomes equal to or lower than a predetermined temperature when the compressor is stopped.

The invention according to claim 3 records the step of energizing the crankcase heater when the difference between the discharge temperature of the compressor and the outside air temperature becomes equal to or lower than a predetermined temperature when the compressor is stopped. The steps are executed by a microcomputer and a program.

Thus, the start of energization according to the outside air temperature can be determined. Therefore, even when the outside air temperature is low, the time until the start of energization does not become extremely short, and the standby power is reduced and the life of the crankcase heater is extended. Can be achieved.

According to a fourth aspect of the present invention, the crankcase heater is provided when the difference between the discharge temperature of the compressor and the outside air temperature is equal to or less than a predetermined temperature and the difference between the discharge temperature of the compressor and the room temperature is equal to or less than a predetermined temperature when the compressor is stopped. Means for energizing the battery.

Further, the invention according to claim 5 is characterized in that, when the compressor is stopped, the difference between the discharge temperature of the compressor and the outside air temperature is equal to or lower than a predetermined temperature and the difference between the discharge temperature of the compressor and the room temperature is equal to or lower than the predetermined temperature. The procedure for energizing the case heater is provided.

The invention according to claim 6 is characterized in that, when the compressor is stopped, the difference between the discharge temperature of the compressor and the outside air temperature is equal to or lower than a predetermined temperature and the difference between the discharge temperature of the compressor and the room temperature is equal to or lower than a predetermined temperature. The step of energizing the case heater is recorded, and the above steps are executed by a microcomputer and a program.

With this, it is possible to determine whether to start energization according to not only the outside air temperature but also the room temperature. Therefore, when the room temperature is lower than the outside air temperature, the start of energization can be further delayed, and the standby power can be reduced. A greater effect of extending the life of the crankcase heater can be obtained.

According to a seventh aspect of the present invention, there is provided a means for energizing the crankcase heater when the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature when the compressor is stopped.

The invention according to claim 8 is provided with a procedure for energizing the crankcase heater when the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature when the compressor is stopped. is there.

The invention according to claim 9 records the step of energizing the crankcase heater when the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature when the compressor is stopped. Yes, the above steps are executed by a microcomputer and a program.

Thus, energization can be started in accordance with the refrigerant holding state in the outdoor unit, so that standby power is reduced and the life of the crankcase heater is extended without increasing the frequency of occurrence of liquid compression in the compressor. be able to.

According to a tenth aspect of the present invention, when the compressor is stopped, the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger is not more than a predetermined temperature, and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger is the predetermined temperature. In the following, a means for energizing the crankcase heater is provided.

Further, according to the present invention, when the compressor is stopped, the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger is equal to or less than a predetermined temperature, and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger is reduced. A procedure for energizing the crankcase heater when the temperature falls below a predetermined temperature.

In the twelfth aspect of the present invention, when the compressor is stopped, the difference between the discharge temperature and the outdoor heat exchanger temperature is equal to or less than a predetermined temperature, and the difference between the discharge temperature of the compressor and the indoor heat exchanger temperature is equal to or less than a predetermined temperature. Then, the step of energizing the crankcase heater is recorded, and the above steps are executed by the microcomputer and the program.

By this means, energization can be started in consideration of the refrigerant holding state not only in the outdoor unit but also in the indoor unit. Therefore, when the indoor heat exchanger temperature is lower than the outdoor heat exchanger temperature, energization is further started. This can be delayed, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained.

According to a thirteenth aspect of the present invention, there is provided means for energizing the crankcase heater when the discharge temperature of the compressor is equal to or lower than a predetermined temperature when the compressor is stopped, or when a predetermined time elapses after the compressor is stopped.

The invention according to claim 14 is provided with a procedure for energizing the crankcase heater when the discharge temperature of the compressor is equal to or lower than a predetermined temperature when the compressor is stopped or when a predetermined time elapses after the compressor is stopped. is there.

According to a fifteenth aspect of the present invention, a step of energizing the crankcase heater when the discharge temperature of the compressor is equal to or lower than a predetermined temperature when the compressor is stopped or when a predetermined time has elapsed after the compressor is stopped is recorded. The above steps are executed by a microcomputer and a program.

Thus, even in the case where the discharge temperature sensor has slipped or failed, the occurrence of liquid compression in the compressor can be prevented.

According to a sixteenth aspect of the present invention, in the first or fourth or seventh or tenth aspect, there is provided means for energizing the crankcase heater when a predetermined time elapses after the compressor stops. .

The invention according to claim 17 is the invention according to claim 2 or 5 or 8 or 11,
A procedure for energizing the crankcase heater when a predetermined time has elapsed after the compressor stopped.

The invention according to claim 18 is the invention according to claim 3 or 6, or 9 or 12,
The step of energizing the crankcase heater when a predetermined time elapses after the compressor stops is recorded, and the above steps are executed by a microcomputer and a program.

Thus, even if the discharge temperature sensor is detached or malfunctions, it is possible to prevent liquid compression from occurring in the compressor, to reduce standby power and to extend the life of the crankcase heater.

According to a nineteenth aspect of the present invention, in the thirteenth or sixteenth aspect, there is provided means for varying the time for starting energization of the crankcase heater depending on the operation time of the compressor.

According to a twentieth aspect of the present invention, there is provided the method according to the fourteenth or seventeenth aspect, further comprising the step of varying the time for starting energization of the crankcase heater depending on the operation time of the compressor. is there.

According to a twenty-first aspect of the present invention, the method according to the fifteenth or eighteenth aspect further comprises the step of varying the time for starting energization of the crankcase heater according to the operating time of the compressor. Yes, the above steps are executed by a microcomputer and a program.

As a result, the amount of heat generated during the operation of the compressor can be taken into consideration, so that the timing accuracy of energization of the crankcase heater is improved, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained. .
In addition, by suppressing the temperature from becoming excessively high when the operation of the compressor is restarted, it is possible to extend the life of the compressor and prevent the occurrence of a hunting phenomenon in the refrigeration system.

According to a twenty-second aspect of the present invention, there is provided a means for energizing the crankcase heater when the state in which the discharge temperature of the compressor is equal to or lower than the predetermined temperature continues for a predetermined time after the compressor stops.

Further, the invention according to claim 23 is a step of energizing the crankcase heater when the state in which the discharge temperature of the compressor is equal to or lower than the predetermined temperature continues for a predetermined time after the compressor stops.
It is provided.

The invention according to a twenty-fourth aspect is a step of energizing the crankcase heater when the state in which the discharge temperature of the compressor is equal to or lower than the predetermined temperature continues for a predetermined time after the compressor is stopped. It is executed by

Thus, when the detected value of the discharge temperature sensor is near the judgment value or when the detected value is temporarily lowered due to water dripping on the sensor, the power supply to the crankcase heater is erroneously started. Can be prevented.

[0048]

Embodiments of an air conditioner control device according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) FIG. 1 is a hardware block diagram of an air conditioner control device according to Embodiment 1 of the present invention, and FIG. 2 is executed by a microcomputer of the air conditioner control device of the embodiment. 4 is a flowchart of a program to be executed.

In FIG. 1, reference numeral 1 denotes a compressor, 2 denotes a crankcase heater, 3 denotes a microcomputer, 4a denotes a program memory for recording a program executed by the microcomputer, 5 denotes a discharge temperature sensor, and 6 denotes an outside air temperature sensor.

The operation of the program for the air conditioner control device configured as described above will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process waits. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
The difference between d and the value Tout of the outside air temperature sensor 6 is calculated, and if the solution is not less than the predetermined temperature value X1, the process returns to step 1,
If the temperature is equal to or lower than the predetermined temperature value X1, the process proceeds to step 3, and the crankcase heater is energized.

Therefore, since the start of energization according to the outside air temperature can be determined, the time until the start of energization does not become extremely short even when the outside air temperature is low, and the standby power can be reduced and the life of the crankcase heater can be extended. Can be planned.

This embodiment is the embodiment of the first aspect, but also includes the contents of the second and third aspects.

(Embodiment 2) FIG. 3 is a hardware block diagram of an air conditioner control apparatus according to Embodiment 2 of the present invention, and FIG. 4 is executed by a microcomputer of the air conditioner control apparatus according to Embodiment 2. 4 is a flowchart of a program to be executed.

In FIG. 3, 1 is a compressor, 2 is a crankcase heater, 3 is a microcomputer, 4b is a program memory for recording a program executed by the microcomputer, 5 is a discharge temperature sensor, 6 is an outside air temperature sensor, and 7 is a room. It is a temperature sensor.

The operation of the program of the air conditioner control device configured as described above will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process stands by. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
The difference between d and the value Tout of the outside air temperature sensor 6 is calculated, and if the solution is not less than the predetermined temperature value X2a, the process returns to step 1;

In step 3, the value T of the discharge temperature sensor 5
The difference between d and the value Tin of the indoor temperature sensor 7 is calculated, and if the solution is not less than the predetermined temperature value X2b, the process returns to step 1;
If the temperature is equal to or less than the predetermined temperature value X2b, the process proceeds to step 4, and the crankcase heater is energized.

Accordingly, the start of energization can be determined according to not only the outside air temperature but also the room temperature, so that when the room temperature is lower than the outside air temperature, the start of energization can be further delayed, and the standby power reduction and cranking A greater effect of extending the life of the case heater can be obtained.

This embodiment is the embodiment of the fourth aspect, but also includes the contents of the fifth and sixth aspects.

(Embodiment 3) FIG. 5 is a hardware block diagram of an air conditioner control apparatus according to Embodiment 3 of the present invention, and FIG. 6 is executed by a microcomputer of the air conditioner control apparatus of the embodiment. 4 is a flowchart of a program to be executed.

In FIG. 5, reference numeral 1 denotes a compressor, 2 denotes a crankcase heater, 3 denotes a microcomputer, 4c denotes a program memory for recording a program executed by the microcomputer, 5 denotes a discharge temperature sensor, and 8 denotes an outdoor heat exchanger temperature sensor. is there.

The operation of the program of the air conditioner control device configured as described above will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process waits. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
The difference between d and the value Tcoil of the outdoor heat exchanger temperature sensor 8 is calculated, and if the solution is not less than the predetermined temperature value X3, the process returns to step 1; Turn on electricity.

Therefore, energization can be started in accordance with the refrigerant holding state in the outdoor unit, so that standby power can be reduced and the life of the crankcase heater can be extended without increasing the frequency of occurrence of liquid compression in the compressor. Can be.

The present embodiment is the embodiment of the seventh aspect, but also includes the contents of the eighth and ninth aspects.

(Embodiment 4) FIG. 7 is a hardware block diagram of an air conditioner control device according to a fourth embodiment of the present invention, and FIG. 8 is executed by a microcomputer of the air conditioner control device of the embodiment. 4 is a flowchart of a program to be executed.

In FIG. 7, 1 is a compressor, 2 is a crankcase heater, 3 is a microcomputer, 4d is a program memory storing a program executed by the microcomputer, 5 is a discharge temperature sensor, 8 is an outdoor unit heat exchanger temperature sensor. , 9 are indoor heat exchanger temperature sensors.

The operation of the program of the air conditioner control device configured as described above will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process stands by. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
The difference between d and the value Tcoil of the outdoor heat exchanger temperature sensor 8 is calculated, and if the solution is not less than the predetermined temperature value X4a, the process returns to step 1;
Proceed to.

In step 3, the value T of the discharge temperature sensor 5
d and the value Tincoil of the indoor heat exchanger temperature sensor 9 is calculated, and if the solution is not lower than the predetermined temperature value X4b, the process returns to step 1; Turn on electricity.

Therefore, the energization can be started in consideration of the refrigerant holding state in the indoor unit as well as in the outdoor unit, and when the indoor heat exchanger temperature is lower than the outdoor heat exchanger temperature, the start of energization is further delayed. As a result, a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained.

Although the present embodiment is the embodiment of claim 10, the contents of claims 11 and 12 are also included.

(Fifth Embodiment) FIG. 9 is a hardware block diagram of an air conditioner control device according to a fifth embodiment of the present invention, and FIG. 4 is a flowchart of a program to be executed.

In FIG. 9, 1 is a compressor, 2 is a crankcase heater, 3 is a microcomputer, 4e is a program memory in which a program executed by the microcomputer is recorded, and 5 is a discharge temperature sensor.

The operation of the program of the air conditioner control device configured as described above will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process waits. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
If d is not lower than the predetermined temperature value X5, the process proceeds to step 4,
If the temperature is equal to or lower than the predetermined temperature value X5, the process proceeds to step 3, and the crankcase heater is energized.

In step 4, if the elapsed time after stopping the compressor is not equal to or longer than the predetermined time Y5, the process returns to step 1, and if it is equal to or longer than the predetermined time Y5, the process proceeds to step 3 to energize the crankcase heater.

Therefore, even in the case where the discharge temperature sensor comes off or fails, the occurrence of liquid compression in the compressor can be prevented.

This embodiment is the embodiment of the thirteenth aspect, but also includes the contents of the fourteenth and fifteenth aspects.

(Embodiment 6) A hardware block diagram of an air conditioner control apparatus according to Embodiment 6 of the present invention is shown in FIG.
This is the same as that described in the fourth embodiment, and a detailed description is omitted. FIG. 11 is a flowchart of a program executed by the microcomputer of the air conditioner control device according to the embodiment.

The operation of the program will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process waits. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
The difference between d and the value Tcoil of the outdoor heat exchanger temperature sensor 8 is calculated, and if the solution is not less than the predetermined temperature value X6a, the process proceeds to step 5;
Proceed to.

In step 3, the value T of the discharge temperature sensor 5
The difference between d and the value Tincoil of the indoor heat exchanger temperature sensor 9 is calculated, and if the solution is not less than the predetermined temperature value X6b, the process proceeds to step 5; Turn on electricity.

In step 5, if the elapsed time after stopping the compressor is not equal to or longer than the predetermined time Y6, the process returns to step 1, and
When it becomes equal to or longer than the predetermined time Y6, the process proceeds to step 4, and the crankcase heater is energized.

Therefore, even if the discharge temperature sensor comes off or is out of order, it is possible to prevent liquid compression from occurring in the compressor, reduce standby power, and extend the life of the crankcase heater.

Although the present embodiment is the embodiment of claim 16, the contents of claims 17 and 18 are also included.

(Embodiment 7) A hardware block diagram of an air conditioner control apparatus according to Embodiment 7 of the present invention is shown in FIG.
This is the same as that described in the fourth embodiment, and a detailed description is omitted. FIG. 12 is a flowchart of a program executed by the microcomputer of the air conditioner control device of the embodiment.

The operation of the program will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process stands by. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
The difference between d and the value Tcoil of the outdoor heat exchanger temperature sensor 8 is calculated, and if the solution is not less than the predetermined temperature value X7a, the process proceeds to step 5;
Proceed to.

In step 3, the value T of the discharge temperature sensor 5
d) and the value Tincoil of the indoor heat exchanger temperature sensor 9 is calculated, and if the solution is not less than the predetermined temperature value X7b, the process proceeds to step 5; Turn on electricity.

In step 5, if the compressor operation time is not less than the predetermined time Y7, the process proceeds to step 7, and the predetermined time Y7
If so, proceed to step 6.

In step 6, if the elapsed time after stopping the compressor is not equal to or longer than the predetermined time Y7a, the process returns to step 1, and if it is equal to or longer than the predetermined time Y7a, the process proceeds to step 4 to energize the crankcase heater.

In step 7, if the elapsed time after stopping the compressor is not equal to or longer than the predetermined time Y7b, the process returns to step 1, and if it is equal to or longer than the predetermined time Y7b, the process proceeds to step 4 to energize the crankcase heater. The predetermined time Y7b
Is a time longer than the predetermined time Y7a.

Therefore, since the amount of heat generated during the operation of the compressor can be taken into consideration, the timing accuracy of the energization of the crankcase heater is improved, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained.
In addition, by suppressing the temperature from becoming excessively high when the operation of the compressor is restarted, it is possible to extend the life of the compressor and prevent the occurrence of a hunting phenomenon in the refrigeration system.

This embodiment is the embodiment of claim 19, but includes the contents of claims 20 and 21.

(Eighth Embodiment) A hardware block diagram of an air conditioner control apparatus according to an eighth embodiment of the present invention is shown in FIG.
This is the same as that described in the fifth embodiment, and a detailed description is omitted. FIG. 13 is a flowchart of a program executed by the microcomputer of the air conditioner control device of the embodiment.

The operation of the program will be described below with reference to the flowchart of FIG.

First, in step 1, it is determined whether the compressor is stopped. If the compressor is operating, the process stands by. If the compressor is stopped, the process proceeds to step 2.

In step 2, the value T of the discharge temperature sensor 5
If d is not lower than the predetermined temperature value X8, the process returns to step 1;
If the temperature is equal to or lower than the predetermined temperature value X8, the process proceeds to step 3.

In step 3, the value T of the discharge temperature sensor 5
If d cannot be maintained for the predetermined temperature value X8 or less for the predetermined time Y8 or more, the process returns to step 1, and if it can be continued for the predetermined time Y8 or more, the process proceeds to step 4 to energize the crankcase heater.

Therefore, when the detected value of the discharge temperature sensor is near the judgment value, or when the detected value is temporarily lowered due to water dripping on the sensor, the power supply to the crankcase heater is erroneously started. Can be prevented.

Although the present embodiment is the embodiment of claim 22, the contents of claims 23 and 24 are also included.

[0112]

As described above, the first aspect of the present invention is provided with a means for energizing the crankcase heater when the difference between the discharge temperature of the compressor and the outside air temperature becomes equal to or lower than a predetermined temperature when the compressor is stopped. Since the energization start determination can be performed according to the outside air temperature, the time until the start of energization does not become extremely short even when the outside air temperature is low, thereby reducing standby power and extending the life of the crankcase heater. be able to.

Further, the invention according to claim 2 is provided with a procedure for energizing the crankcase heater when the difference between the discharge temperature of the compressor and the outside air temperature falls below a predetermined temperature when the compressor is stopped. Since the start of energization according to the temperature can be determined, the time until the start of energization does not become extremely short even when the outside air temperature is low, so that standby power can be reduced and the life of the crankcase heater can be extended.

The invention according to claim 3 records the step of energizing the crankcase heater when the difference between the discharge temperature of the compressor and the outside air temperature becomes equal to or lower than a predetermined temperature when the compressor is stopped. Since the start of energization according to the temperature can be determined, the time until the start of energization does not become extremely short even when the outside air temperature is low, so that standby power can be reduced and the life of the crankcase heater can be extended. The above steps are executed by a microcomputer and a program.

Further, the invention according to claim 4 is characterized in that, when the compressor is stopped, the difference between the discharge temperature of the compressor and the outside air temperature is equal to or lower than a predetermined temperature and the difference between the discharge temperature of the compressor and the room temperature is equal to or lower than the predetermined temperature. Means for energizing the case heater, so that energization start determination can be performed according to not only the outside air temperature but also the room temperature, so that when the room temperature is lower than the outside air temperature, the start of energization is further delayed. As a result, a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained.

The invention according to claim 5 is characterized in that when the compressor is stopped, the difference between the discharge temperature of the compressor and the outside air temperature is equal to or lower than a predetermined temperature and the difference between the discharge temperature of the compressor and the room temperature is equal to or lower than a predetermined temperature. The procedure to energize the case heater is provided, and the energization start can be determined not only according to the outside air temperature but also according to the indoor temperature. Therefore, when the indoor temperature is lower than the outside air temperature, the energization start is further delayed. As a result, a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained.

The invention according to claim 6 is characterized in that when the compressor is stopped, the difference between the discharge temperature of the compressor and the outside air temperature is equal to or lower than a predetermined temperature and the difference between the discharge temperature of the compressor and the room temperature is equal to or lower than a predetermined temperature. The step of energizing the case heater is recorded, and the energization start can be determined according to not only the outside air temperature but also the room temperature. Therefore, when the room temperature is lower than the outside air temperature, the start of energization is further delayed. As a result, a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained. The above steps are executed by a microcomputer and a program.

Further, the invention according to claim 7 is provided with means for energizing the crankcase heater when the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature when the compressor is stopped. In addition, since energization can be started in accordance with the refrigerant holding state in the outdoor unit, standby power can be reduced and the life of the crankcase heater can be extended without increasing the frequency of occurrence of liquid compression of the compressor.

Further, the invention according to claim 8 is provided with a procedure for energizing the crankcase heater when the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature when the compressor is stopped. In addition, since energization can be started in accordance with the refrigerant holding state in the outdoor unit, standby power can be reduced and the life of the crankcase heater can be extended without increasing the frequency of occurrence of liquid compression of the compressor.

The invention according to claim 9 records the step of energizing the crankcase heater when the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature when the compressor is stopped. In addition, since energization can be started in accordance with the refrigerant holding state in the outdoor unit, the standby power can be reduced and the life of the crankcase heater can be extended without increasing the frequency of occurrence of liquid compression of the compressor.
The above steps are executed by a microcomputer and a program.

Further, according to the present invention, when the compressor is stopped, the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger is equal to or less than a predetermined temperature, and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger is reduced. Means for energizing the crankcase heater when the temperature falls below a predetermined temperature, and the energization can be started in consideration of the refrigerant holding state in the indoor unit as well as in the outdoor unit. When the temperature is lower than the outdoor heat exchanger temperature, the start of energization can be further delayed, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained.

Further, according to the present invention, when the compressor is stopped, the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger is equal to or lower than a predetermined temperature, and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger is reduced. When the temperature falls below a predetermined temperature, a procedure for energizing the crankcase heater is provided.The energization can be started not only in the outdoor unit but also in the refrigerant holding state in the indoor unit. When the temperature is lower than the outdoor heat exchanger temperature, the start of energization can be further delayed, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained.

Further, according to the twelfth aspect of the present invention, when the compressor is stopped, the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger is equal to or less than a predetermined temperature, and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger is reduced. When the temperature falls below a predetermined temperature, the step of energizing the crankcase heater is recorded, and the energization can be started not only in the outdoor unit but also in the refrigerant holding state in the indoor unit, so that the indoor heat exchanger temperature is reduced. When the temperature is lower than the outdoor heat exchanger temperature, the start of energization can be further delayed, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained. The above steps are executed by a microcomputer and a program.

Further, the invention according to claim 13 is provided with means for energizing the crankcase heater when the discharge temperature of the compressor is equal to or lower than a predetermined temperature when the compressor is stopped or when a predetermined time elapses after the compressor is stopped. In addition, even in the case where the discharge temperature sensor comes off or fails, the occurrence of liquid compression in the compressor can be prevented.

Further, the invention according to claim 14 is provided with a procedure for energizing the crankcase heater when the discharge temperature of the compressor is equal to or lower than a predetermined temperature when the compressor is stopped or when a predetermined time elapses after the compressor is stopped. In addition, even in the case where the discharge temperature sensor comes off or fails, the occurrence of liquid compression in the compressor can be prevented.

The invention according to claim 15 records the step of energizing the crankcase heater when the discharge temperature of the compressor is equal to or lower than a predetermined temperature when the compressor is stopped or when a predetermined time has elapsed after the compressor stopped. In addition, even in the case where the discharge temperature sensor comes off or fails, the occurrence of liquid compression of the compressor can be prevented. The above steps are executed by a microcomputer and a program.

The invention according to claim 16 is the invention according to claim 1 or 4 or 7 or 10.
Means for energizing the crankcase heater when a predetermined time elapses after the compressor stops, and in the event that the discharge temperature sensor comes off or breaks down, it is possible to prevent liquid compression from occurring in the compressor, It is possible to reduce standby power and extend the life of the crankcase heater.

The invention according to claim 17 is the invention according to claim 2 or 5, or 8 or 11,
A procedure for energizing the crankcase heater when a predetermined time elapses after the compressor is stopped is provided.Even if the discharge temperature sensor is disconnected or malfunctions, it is possible to prevent the occurrence of liquid compression of the compressor, It is possible to reduce standby power and extend the life of the crankcase heater.

The invention according to claim 18 is the invention according to claim 3 or 6, or 9 or 12,
The step of energizing the crankcase heater when a predetermined time elapses after the compressor is stopped is recorded, and even in the case of disconnection or failure of the discharge temperature sensor, it is possible to prevent the occurrence of liquid compression of the compressor, It is possible to reduce standby power and extend the life of the crankcase heater.
The above steps are executed by a microcomputer and a program.

[0130] According to a nineteenth aspect of the present invention, in the thirteenth or sixteenth aspect of the present invention, there is provided means for varying the time to start energizing the crankcase heater depending on the operation time of the compressor. In addition, since the amount of heat generated during the operation of the compressor can be taken into consideration, the timing accuracy of the power supply to the crankcase heater can be improved, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained. In addition, by suppressing the temperature from becoming excessively high when the operation of the compressor is restarted, it is possible to extend the life of the compressor and prevent the occurrence of a hunting phenomenon in the refrigeration system.

According to a twentieth aspect of the present invention, there is provided the method according to the fourteenth or seventeenth aspect of the present invention, further comprising the step of varying the time for starting energization of the crankcase heater depending on the operation time of the compressor. In addition, since the amount of heat generated during the operation of the compressor can be taken into consideration, the timing accuracy of the power supply to the crankcase heater can be improved, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained. In addition, by suppressing the temperature from becoming excessively high when the operation of the compressor is restarted, it is possible to extend the life of the compressor and prevent the occurrence of a hunting phenomenon in the refrigeration system.

The invention according to claim 21 records the step of varying the time to start energizing the crankcase heater according to the operation time of the compressor in the invention according to claim 15 or 18. In addition, since the amount of heat generated during the operation of the compressor can be taken into consideration, the timing accuracy of the power supply to the crankcase heater can be improved, and a greater effect of reducing standby power and extending the life of the crankcase heater can be obtained. In addition, by suppressing the temperature from becoming excessively high when the operation of the compressor is restarted, it is possible to extend the life of the compressor and prevent the occurrence of a hunting phenomenon in the refrigeration system. The above steps are executed by a microcomputer and a program.

Further, the invention according to claim 22 is provided with means for energizing the crankcase heater when the discharge temperature of the compressor is not higher than the predetermined temperature after the compressor stops for a predetermined time. If the temperature sensor detection value is near the judgment value, or if the detection value temporarily drops due to water dripping on the sensor, it is possible to prevent the power supply to the crankcase heater from being started by mistake. it can.

The invention according to claim 23 is provided with a procedure for energizing the crankcase heater when the state in which the discharge temperature of the compressor is equal to or lower than the predetermined temperature continues for a predetermined time after the compressor stops. If the temperature sensor detection value is near the judgment value, or if the detection value temporarily drops due to water dripping on the sensor, it is possible to prevent the power supply to the crankcase heater from being started by mistake. it can.

The invention according to a twenty-fourth aspect is a step of energizing the crankcase heater when the state where the discharge temperature of the compressor is equal to or lower than the predetermined temperature continues for a predetermined time after the compressor is stopped. It is possible to prevent the power supply to the crankcase heater from being erroneously started when the sensor is near the determination value or when the detection value temporarily drops due to water dripping on the sensor. The above steps are executed by a microcomputer and a program.

[Brief description of the drawings]

FIG. 1 is a hardware block diagram of an air conditioner control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a program executed by a microcomputer of the air conditioner control device of the embodiment.

FIG. 3 is a hardware block diagram of an air conditioner control device according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a program executed by a microcomputer of the air conditioner control device of the embodiment.

FIG. 5 is a hardware block diagram of an air conditioner control device according to a third embodiment of the present invention.

FIG. 6 is a flowchart of a program executed by a microcomputer of the air conditioner control device of the embodiment.

FIG. 7 is a hardware block diagram of an air conditioner control device according to a fourth embodiment of the present invention.

FIG. 8 is a flowchart of a program executed by a microcomputer of the air conditioner control device of the embodiment.

FIG. 9 is a hardware block diagram of an air conditioner control device according to a fifth embodiment of the present invention.

FIG. 10 is a flowchart of a program executed by a microcomputer of the air conditioner control device of the embodiment.

FIG. 11 is a flowchart of a program executed by a microcomputer of the air conditioner control device according to Embodiment 6 of the present invention.

FIG. 12 is a flowchart of a program executed by a microcomputer of the air conditioner control device according to the seventh embodiment of the present invention.

FIG. 13 is a flowchart of a program executed by a microcomputer of the air conditioner control device according to the eighth embodiment of the present invention.

FIG. 14 is a control circuit diagram of a conventional air conditioner control device.

[Explanation of symbols]

 3 microcomputer 4a, 4b, 4c, 4d, 4e Program memory

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeshi Okeya 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Osamu Katagiri 4-chome Takaidahondori, Higashiosaka-shi, Osaka No. 2 Matsushita Refrigeration Machinery Co., Ltd. (72) Inventor Hiroto Naka 2-4-5 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Inside Matsushita Refrigeration Machinery Co., Ltd. (72) Inventor Akihiko Hyodo Takaitamoto, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerating Machinery Co., Ltd., 4-5-2-5, Matsushita Refrigerator Co., Ltd. (72) Inventor Masato Ariki 4-5-2-5 Takaida Hondori, Matsushita Refrigerating Machinery Co., Ltd., Higashi-Osaka, Osaka Prefecture Matsushita Refrigeration Machinery Co., Ltd. 4-5-2, Takaidahondori-shi, Yokohama (72) Inventor Yasuyuki Doi 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigeration Machinery Co., Ltd. (72) Inventor Product 欣公 Osaka Higashi Takaidahondori 4-chome No. 2 No. 5 Matsushitareiki Co., Ltd. in the F-term (reference) 3L060 AA03 CC01 CC03 CC04 CC19 DD01 EE03

Claims (24)

[Claims] 1. An air conditioner control device having means for energizing a crankcase heater when a difference between a discharge temperature of a compressor and an outside air temperature becomes equal to or lower than a predetermined temperature when the compressor is stopped. 2. A method for controlling an air conditioner, comprising the step of energizing a crankcase heater when a difference between a discharge temperature of a compressor and an outside air temperature falls below a predetermined temperature when the compressor is stopped. 3. A recording medium recording an air conditioner control program having a step of energizing a crankcase heater when a difference between a discharge temperature of a compressor and an outside air temperature becomes equal to or lower than a predetermined temperature when the compressor is stopped by a microcomputer and a program. 4. An air having means for energizing a crankcase heater when a difference between a discharge temperature of a compressor and an outside air temperature is equal to or lower than a predetermined temperature and a difference between a discharge temperature of the compressor and an indoor temperature is equal to or lower than a predetermined temperature when the compressor is stopped. Harmonic machine control device. 5. An air having a procedure for energizing a crankcase heater when a difference between a discharge temperature of a compressor and an outside air temperature is equal to or lower than a predetermined temperature and a difference between a discharge temperature of the compressor and an indoor temperature is equal to or lower than a predetermined temperature when the compressor is stopped. Harmonic machine control method. 6. A microcomputer and a program energize the crankcase heater when the difference between the discharge temperature of the compressor and the outside air temperature is equal to or lower than a predetermined temperature and the difference between the discharge temperature of the compressor and the indoor temperature is equal to or lower than a predetermined temperature when the compressor is stopped. A recording medium recording an air conditioner control program having steps. 7. An air conditioner control device having means for energizing a crankcase heater when a difference between a discharge temperature of the compressor and a temperature of the outdoor heat exchanger becomes lower than a predetermined temperature when the compressor is stopped. 8. An air conditioner control method comprising the step of energizing a crankcase heater when a difference between a discharge temperature of a compressor and a temperature of an outdoor heat exchanger falls below a predetermined temperature when the compressor is stopped. 9. A recording record of an air conditioner control program having a step of energizing a crankcase heater when a difference between a discharge temperature of a compressor and a temperature of an outdoor heat exchanger becomes equal to or lower than a predetermined temperature when the compressor is stopped by a microcomputer and a program. Medium. 10. When the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger is lower than a predetermined temperature and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger is lower than the predetermined temperature when the compressor is stopped, the crankcase heater is turned on. An air conditioner control device having a means for energizing. 11. When the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger falls below the predetermined temperature when the compressor is stopped, the crankcase heater is turned on. An air conditioner control method having a procedure for energizing. 12. When the difference between the discharge temperature of the compressor and the temperature of the outdoor heat exchanger falls below a predetermined temperature and the difference between the discharge temperature of the compressor and the temperature of the indoor heat exchanger falls below the predetermined temperature when the compressor is stopped by the microcomputer and the program. A recording medium storing an air conditioner control program having a step of energizing a crankcase heater. 13. An air conditioner control device having means for supplying electricity to a crankcase heater when the discharge temperature of the compressor is equal to or lower than a predetermined temperature when the compressor is stopped or when a predetermined time elapses after the compressor is stopped. 14. A method for controlling an air conditioner, comprising the steps of energizing a crankcase heater when the discharge temperature of a compressor is equal to or lower than a predetermined temperature when the compressor is stopped or when a predetermined time has elapsed after the compressor is stopped. 15. A recording program for recording an air conditioner control program having a step of energizing a crankcase heater when a discharge temperature of a compressor is equal to or lower than a predetermined temperature when a compressor is stopped or when a predetermined time elapses after the compressor is stopped by a microcomputer and a program. Medium. 16. A means for energizing a crankcase heater when a predetermined time elapses after the compressor stops.
The air conditioner control device according to any one of claims 4, 7, and 10. 17. A procedure for energizing a crankcase heater when a predetermined time elapses after the compressor stops.
The air conditioner control method according to any one of claims 5, 8, and 11. 18. The air conditioner control program according to claim 3, further comprising a step of energizing the crankcase heater when a predetermined time elapses after the compressor stops by the microcomputer and the program. Recording medium. 19. The air conditioner control device according to claim 13, further comprising means for varying the time for starting energization of the crankcase heater depending on the operation time of the compressor. 20. The air conditioner control method according to claim 14, further comprising the step of varying the time for starting energization of the crankcase heater according to the operation time of the compressor. 21. The method according to claim 15, further comprising the step of varying the time for starting energization of the crankcase heater according to the operation time of the compressor by a microcomputer and a program.
A recording medium on which the air conditioner control program described above is recorded. 22. An air conditioner control device having means for energizing a crankcase heater when a state in which a discharge temperature of a compressor is equal to or lower than a predetermined temperature continues for a predetermined time after the compressor is stopped. 23. A method for controlling an air conditioner, comprising the step of energizing a crankcase heater when a state in which a discharge temperature of a compressor is equal to or lower than a predetermined temperature continues for a predetermined time after the compressor is stopped. 24. A recording medium recording an air conditioner control program having a step of energizing a crankcase heater when a state in which a discharge temperature of a compressor is equal to or lower than a predetermined temperature continues for a predetermined time after the compressor is stopped by a microcomputer and a program.