JP2006329447A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner capable of preventing the deterioration of the amenity of a passenger caused by the change of a conditioned-air supply temperature, and preventing the frosting of an evaporator. <P>SOLUTION: In this air conditioner 1 comprising a compressor 5 for compressing a gaseous refrigerant, a condenser 6 for condensing the gas refrigerant of high pressure by exchanging heat with the outside air, and an expansion valve 7 for changing a liquid refrigerant of a high temperature and high pressure to a liquid refrigerant of a low temperature and low pressure, and further comprising a refrigerating cycle 2 for supplying the liquid refrigerant of the low temperature and the low pressure to the evaporator 4, a motor 8 for driving the compressor 5, and a rotational frequency control means 11 for controlling the rotational frequency of the motor 8, the rotational frequency control means 11 controls the rotational frequency of the motor 8 on the basis of the pressure at the low pressure-side of the refrigerating cycle 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner including an electric motor capable of controlling the rotation speed and a compressor driven by the electric motor.

As an air conditioner including a compressor driven by an electric motor, for example, there is one having a configuration disclosed in Patent Document 1.
JP 11-34649 A

In such an air conditioner, the rotation speed control of the electric motor is performed using the air temperature value blown from the evaporator.
However, in such a method, due to the heat capacity of the evaporator itself and the heat capacity of the condensed water adhering to the surface of the evaporator, a time delay occurs in the motor rotation speed control, and the rotation speed is reduced until the rotation speed of the motor is stabilized. Since overshooting occurs, the temperature of the air blown from the evaporator does not reach a desired temperature. As a result, the air-conditioning blow-out temperature in the vehicle is not stable, and the passenger's comfort is impaired.
In addition, in the vehicle air conditioner, the motor can follow the air conditioner when it is switched from a high load condition (for example, outside air setting) to a low load condition (for example, inside air setting), particularly during cooling operation in summer. There was also a problem that it was operated under high load conditions, and the condensed water adhering to the surface of the evaporator was excessively cooled and frozen (frosted).

  The present invention has been made in view of the above circumstances, and an air conditioner capable of preventing a passenger from deteriorating in comfort due to unstable air-conditioning blowing temperature and preventing frost of an evaporator. It is intended to provide.

The present invention employs the following means in order to solve the above problems.
An air conditioner according to the present invention includes a compressor that compresses a gaseous refrigerant, a condenser that exchanges high-pressure gas refrigerant by heat exchange with outside air, and an expansion valve that converts high-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure liquid refrigerant. An air conditioner comprising: a refrigeration cycle for supplying low-temperature and low-pressure liquid refrigerant to the evaporator; an electric motor that drives the compressor; and a rotational speed control means that controls the rotational speed of the electric motor, wherein the rotational speed is A control means controls the rotation speed of the electric motor based on the pressure on the low pressure side of the refrigeration cycle.
According to such an air conditioner, the rotational speed of the electric motor, that is, the rotational speed of the compressor is controlled based on the pressure on the low pressure side of the refrigeration cycle. That is, as the feedback term for controlling the rotational speed of the motor, the low-pressure side pressure, which is a direct control factor, is used. Therefore, the rotational speed of the motor is easily controlled to a desired target low pressure, and air conditioning A passenger's comfort deterioration due to the unstable blowing temperature is prevented, and the frost of the evaporator is prevented.

In the air conditioner according to the present invention, the pressure on the low-pressure side of the refrigeration cycle is an actual measurement value measured by the low-pressure detection means, and the rotational speed of the compressor is an actual measurement value measured by the low-pressure detection means, It is desirable to control based on the target value of the pressure on the low pressure side.
According to such an air conditioner, the pressure on the low-pressure side of the refrigeration cycle is an actual measurement value measured by the low-pressure detection means, and the rotation speed of the compressor is the pressure on the low-pressure side of the refrigeration cycle and the pressure of the refrigeration cycle. Control is based on the target value of the pressure on the low pressure side.

In the air conditioner according to the present invention, the target value of the pressure on the low-pressure side of the refrigeration cycle is calculated from the condenser inlet air volume, the evaporator inlet air volume, the condenser intake air temperature, and the evaporator intake air temperature. desirable.
According to such an air conditioner, the target value of the pressure on the low pressure side of the refrigeration cycle is calculated from the condenser inlet air volume, the evaporator inlet air volume, the condenser intake air temperature, and the evaporator intake air temperature. That is, the condenser inlet air volume, the evaporator inlet air volume, the condenser intake air temperature, and the evaporator intake air temperature are taken into consideration, so that the electric motor and the compressor are operated more efficiently, and energy saving of the apparatus is achieved. Therefore, it is possible to prevent a passenger's comfort from being deteriorated due to a change in air-conditioning outlet temperature.

  According to the air conditioner of the present invention, it is possible to prevent a passenger's comfort from being deteriorated due to an unstable air-conditioning outlet temperature, and to prevent the evaporator from being frosted.

Hereinafter, a first embodiment when the present invention is applied to a vehicle air conditioner will be described with reference to FIG.
FIG. 1 is a block diagram showing a schematic configuration of a vehicle air conditioner 1. The vehicle air conditioner 1 includes a refrigeration cycle 2 and an air control device (hereinafter referred to as “air conditioner CPU”) 3. It is configured as the main element.

The refrigeration cycle 2 supplies a low-temperature and low-pressure liquid refrigerant to the evaporator 4 and includes a compressor 5, a condenser 6, and an expansion valve 7.
The compressor 5 compresses the low-temperature and low-pressure gas refrigerant vaporized by taking the heat in the passenger compartment with the evaporator 4, and sends it to the condenser 6 as a high-temperature and high-pressure gas refrigerant. The compressor 5 is driven by the power of an electric motor (motor) 8. .
The condenser 6 is disposed, for example, in the front part of the engine room, and cools the high-temperature and high-pressure gas refrigerant supplied from the compressor 5 with outside air to condense and liquefy the gaseous refrigerant. The refrigerant thus liquefied is sent to a receiver (not shown) for gas-liquid separation, and then sent to the expansion valve 7 as a high-temperature and high-pressure liquid refrigerant. In this expansion valve 7, the high-temperature and high-pressure liquid refrigerant is decompressed and expanded to form a low-temperature and low-pressure liquid (mist-like) refrigerant and supplied to the evaporator 4.

  The rotation speed of the electric motor 8 is variably controlled by an inverter (rotation speed control means) 9, for example, electric power supplied from an in-vehicle battery (not shown). Therefore, by changing the refrigerant discharge capacity by the compressor 5 and adjusting the circulation amount (flow rate) of the refrigerant circulating in the refrigeration cycle 2 according to the change in the rotation speed of the electric motor 8 due to the change in the supplied power, the evaporator 4 The cooling capacity (cooling capacity of the refrigeration cycle 2) is controlled.

  The low pressure detection means 21 is for actually detecting the pressure on the low pressure side, and the detected information is output to the electric compressor rotation speed control means 11.

Inside the air conditioner CPU 3, a microcomputer such as a target low pressure calculating means 10 and an electric compressor rotation speed control means 11 is provided.
The target low pressure calculation means 10 is connected to the set temperature detection means 12 and is output to the electric compressor rotation speed control means 11.

  The electric compressor rotational speed control means 11 is a part that controls the rotational speed of the electric motor 8 of the compressor 5 so that the rotational speed is in accordance with the output of the target low pressure calculating means 10. Output to 9. That is, the rotational speed of the compressor 5 is controlled so that the low pressure value becomes the value (target value) calculated by the target low pressure calculating means 10.

According to the vehicle air conditioner 1 according to the present embodiment, the low-pressure side pressure that is a direct control factor is used as a feedback term for controlling the rotational speed of the electric motor 8, so that the rotational speed of the electric motor 8 is easily desired. Therefore, the frost of the evaporator can be reliably prevented.
Moreover, since the fluctuation range of the rotation speed of the electric motor 8 can be expanded, it is possible to prevent the rotation speed of the electric motor 8 from overshooting or undershooting, and boarding due to unstable air-conditioning outlet temperature. Deterioration of comfort for the person can be prevented.

A second embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIG.
The vehicle air conditioner 20 according to the present embodiment includes a condenser (condenser) inlet air volume detecting means 13, an evaporator (evaporator) inlet air volume detecting means 14, a condenser intake air temperature detecting means 15, and an evaporator intake air temperature detecting. Means 16 is provided, and the set temperature detection means 12, the condenser inlet air volume detection means 13, the evaporator inlet air volume detection means 14, the condenser suction air temperature detection means 15, and the evaporator suction air temperature detection means 16. Is different from the above-described embodiment in that it is a part for calculating a target low pressure corresponding to a desired (in-vehicle) set temperature. Note that a theoretical formula or a multiple regression formula is used to calculate the target low pressure. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

The condenser inlet air volume detection means 13 estimates the air volume passing through the condenser 6 from the radiator / condenser fan input signal (generally, three stages of Hi, Lo, and OFF) and the vehicle speed. Since the target low pressure is calculated using this air volume, even if there is a change in the condenser inlet air volume, the air-conditioning outlet temperature in the car can be controlled to be constant, thus preventing deterioration of passenger comfort. There is an advantage of doing.
The evaporator inlet air volume detecting means 14 estimates the air volume passing through the evaporator 4 from the manual air volume setting recognized by the air conditioner CPU 3 or the air volume at the time of the auto air conditioner and the inside / outside air setting. Since the target low pressure is calculated using this air volume, even if the evaporator inlet air volume is changed, the air-conditioning outlet temperature in the vehicle can be controlled to be constant, thus preventing deterioration of passenger comfort. There is an advantage of doing.
The condenser intake air temperature detecting means 15 estimates the condenser intake air temperature from the detected value of the outside temperature sensor detected by the outside temperature sensor (not shown) and the vehicle speed. Since the target low pressure is calculated using this air temperature, the air conditioning outlet temperature in the vehicle can be controlled to be constant even if there is a change in the intake air temperature of the condenser. There is an advantage of preventing.
The evaporator intake air temperature detection means 16 uses either the vehicle interior temperature sensor detected value detected by the vehicle interior temperature sensor (not shown) or the vehicle exterior temperature sensor detected value detected by the vehicle exterior temperature sensor (not shown). Is determined by setting the inside / outside air, and after this determination, the intake air of the evaporator is estimated from the detected value of the in-vehicle temperature sensor or the detected value of the outside temperature sensor and the vehicle speed. Since the target low pressure is calculated using this air temperature, the air conditioning outlet temperature in the vehicle can be controlled to be constant even if there is a change in the evaporator intake air temperature. There is an advantage of preventing.

According to the vehicle air conditioner 20 according to the present embodiment, the rotational speed of the electric motor 8 of the compressor 5 is controlled by the target pressure calculated by the target low pressure calculating means 10, so that the electric motor 8 and the compressor 5 are made more efficient. It can be operated well and energy saving of the apparatus can be achieved.
Other functions and effects are the same as those of the above-described embodiment, and thus description thereof is omitted here.

A third embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIG.
FIG. 3 is a block diagram showing a schematic configuration of the vehicle air conditioner 30. The vehicle air conditioner 30 includes a refrigeration cycle 2 and an air control device (hereinafter referred to as “air conditioner CPU”) 31. It is configured as the main element.

The refrigeration cycle 2 supplies a low-temperature and low-pressure liquid refrigerant to the evaporator 4 and includes a compressor 5, a condenser 6, and an expansion valve 7.
The compressor 5 compresses the low-temperature and low-pressure gas refrigerant vaporized by taking the heat in the passenger compartment with the evaporator 4, and sends it to the condenser 6 as a high-temperature and high-pressure gas refrigerant. The compressor 5 is driven by the power of an electric motor (motor) 8. .
The condenser 6 is disposed, for example, in the front part of the engine room, and cools the high-temperature and high-pressure gas refrigerant supplied from the compressor 5 with outside air to condense and liquefy the gaseous refrigerant. The refrigerant thus liquefied is sent to a receiver (not shown) for gas-liquid separation, and then sent to the expansion valve 7 as a high-temperature and high-pressure liquid refrigerant. In this expansion valve 7, the high-temperature and high-pressure liquid refrigerant is decompressed and expanded to form a low-temperature and low-pressure liquid (mist-like) refrigerant and supplied to the evaporator 4.

  The rotation speed of the electric motor 8 is variably controlled by an inverter (rotation speed control means) 9, for example, electric power supplied from an in-vehicle battery (not shown). Therefore, by changing the refrigerant discharge capacity by the compressor 5 and adjusting the circulation amount (flow rate) of the refrigerant circulating in the refrigeration cycle 2 according to the change in the rotation speed of the electric motor 8 due to the change in the supplied power, the evaporator 4 The cooling capacity (cooling capacity of the refrigeration cycle 2) is controlled.

Inside the air conditioner CPU 31, a microcomputer such as a target low pressure calculation means 10 and an electric compressor rotation speed control means 11 is provided.
The target low pressure calculation means 10 is connected to the condenser suction temperature correction means 32, the evaporator suction temperature correction means 33, the evaporator suction air amount calculation means 34, the condenser suction air amount calculation means 35, and the necessary heat amount calculation means 36. .
The condenser suction temperature correction means 32 is connected to an outside temperature sensor 37, and a condenser suction temperature correction value (Tout.cor.) Is calculated based on information from the outside temperature sensor 37. .

  The evaporator suction temperature correction means 33 is connected to the evaporator suction temperature determination means 38. The evaporator suction temperature determination means 38 is connected to the outside temperature sensor 37, the inside temperature sensor 39, and the inside / outside air setting detection means 40. The outside temperature sensor 37, the inside temperature sensor 39, and the inside / outside air setting detection means. Based on the information from 40, the evaporator suction temperature is determined. The result determined by the evaporator suction temperature determination means 38 is output to the evaporator suction temperature correction means 33 so that the evaporator suction temperature correction means 33 calculates the evaporator suction temperature correction value (Tin.cor.). It has become.

The evaporator suction air volume calculation means 34 is connected to the inside / outside air setting detection means 40 and the blower air volume setting means 41, and the evaporator suction air volume (in accordance with the information from the inside / outside air setting detection means 40 and the blower air volume setting means 41). Ve) is calculated.
The condenser intake air volume calculating means 35 is connected to the radiator / condenser fan state detecting means 42 and the vehicle speed detecting means 43, and the condenser suction is calculated based on the information from the radiator / condenser fan state detecting means 42 and the vehicle speed detecting means 43. The air volume (Vc) is calculated.

The required heat quantity calculation means 36 uses the table stored in advance in the required heat quantity calculation means 36 based on the in-vehicle set temperature (Tset) sent from the set temperature detection means 12. This necessary heat quantity (Tset.cor.) Is determined only by the in-vehicle set temperature (Tset) regardless of the operating conditions of the refrigeration cycle 2.
Then, the target low pressure calculation means 10 uses the information from the condenser suction temperature correction means 32, the evaporator suction temperature correction means 33, the evaporator suction air amount calculation means 34, and the condenser suction air amount calculation means 35 to obtain the necessary heat amount. A target low pressure (LPt) corresponding to (Tset.cor.) Is calculated. The target low pressure (LPt) is calculated by the following equation.
[Formula 1]
LPt =
(A × Tset.cor.) + (B × Vc) + (c × Ve) + (d × Tout.cor.) + (E × Tin.cor.)

  The electric compressor rotational speed control means 11 is a part that controls the rotational speed of the electric motor 8 of the compressor 5 so that the rotational speed is in accordance with the output of the target low pressure calculating means 10. Output to 9. That is, the rotational speed of the compressor 5 is controlled so that the low pressure value becomes the value (target value) calculated by the target low pressure calculating means 10.

  Since the operational effect is the same as that of the above-described embodiment, the description thereof is omitted here.

A fourth embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIG.
The vehicle air conditioner 50 according to the present embodiment is the same as that of the third embodiment described above in that energy saving is taken into consideration when the required heat quantity (Tset.cor.) Is determined by the required heat quantity calculation means 36. Different. Since other components are the same as those of the third embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

That is, the necessary heat amount calculation means 36 of the vehicle air conditioner 50 in this embodiment calculates (determines) a value within a range that does not cause fogging of the window or an odor of the evaporator and does not impair comfort. It has become. In other words, the ASHRAE Summer and Winter Comfort Zone is simplified to realize a state where the humidity is 60% or less and there is no off-flavor.
Specifically, Tset.cor is calculated within a range in which the passenger's comfort is not deteriorated by the necessary heat amount calculation means 36 based on a calculation formula and a map using information on the inside / outside air setting, the inside temperature, the outside temperature, and the inside temperature as input items. The target low pressure is determined using the following formula so that.
W = (Tset-Tin) .G + (Tset-a) .G.b + (Tset-c) .G.d + e
The map is, for example, a trapezoidal map with W as the x-axis and Tset.cor. As the y-axis, and uses an air conditioner control map.

According to the vehicle air conditioner 50 according to the present embodiment, it is possible to prevent the fogging of the windows and the occurrence of a strange odor of the evaporator, thereby improving the comfort.
Other functions and effects are the same as those of the above-described embodiment, and thus description thereof is omitted here.

5th Embodiment at the time of applying this invention to the air conditioning apparatus for vehicles is described, referring FIG.
The vehicle air conditioner 60 according to the present embodiment differs from that of the fourth embodiment described above in that noise is taken into account when determining the required heat quantity (Tset.cor.) In the required heat quantity calculation means 36. . Since other components are the same as those of the fourth embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

In the required heat amount calculation means 36 of the vehicle air conditioner 60 in the present embodiment, the window is not fogged, and the value of the required heat amount (Tset.cor.) Considering noise is calculated (determined). ing.
Specifically, first, the amount of heat (A1) that does not cause fogging of the window is calculated based on information from the inside / outside air setting detection means 40, the inside temperature sensor 39, and the outside temperature sensor 37.
Next, the heat quantity (A2) in consideration of noise is calculated from the energy saving control heat quantity and the information from the vehicle speed detecting means 43 and the blower air volume setting means 41. This heat quantity (A2) is obtained by multiplying the energy saving control heat quantity by a coefficient obtained from the vehicle speed detecting means 43 and the blower air volume setting means 41, and shows a value smaller than the energy saving control heat quantity.
If the heat quantity considering noise (A2) exceeds the heat quantity (A1) where window fogging does not occur, the heat quantity considering noise (A2) is set as the required heat quantity (Tset.cor.), And noise is taken into consideration. When the amount of heat (A2) is lower than the amount of heat (A1) at which window fogging does not occur, the amount of heat (A1) at which window fogging does not occur is defined as the required amount of heat (Tset.cor.).
Note that “considering noise” is specifically the same as in the sixth embodiment described later, and the noise values of the electric motor 8 and the compressor 5 are the desired values ( 3db (A)) is the upper limit, and the motor speed is limited.

According to the vehicle air conditioner 60 according to the present embodiment, it is possible to prevent the fogging of the windows from occurring and to easily eliminate the noise caused by the electric motor 8 and the compressor 5. Discomfort can be prevented.
Other functions and effects are the same as those of the above-described embodiment, and thus description thereof is omitted here.

A sixth embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIG.
The vehicle air conditioner 70 in this embodiment is the same as that of the third to fifth embodiments described above in that it includes an electric compressor rotation speed control value calculation means 71 and a low rotation side determination means 72. And different. Since other components are the same as those of the third to fifth embodiments described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

The electric compressor rotation speed control value calculation means 71 is connected to the blower air volume setting means 41 and the vehicle speed detection means 43, and is generated from the compressor by information from the radiator / capacitor fan state detection means 42 and the vehicle speed detection means 43. The electric compressor rotational speed control value (RPSmax) is calculated from the multiple regression equation so that the noise to be generated is within the range of noise generated from a blower (not shown) +3 db.
The low-rotation-side determining means 72 includes an electric compressor rotational speed (Crps) corresponding to a target low pressure (LPt) obtained from the amount of heat (A1) at which window fogging does not occur, and an electric compressor rotational speed control value (RPSmax). And the lower rotation speed is output to the inverter 9. When the electric compressor rotation speed control value (RPSmax) is selected, control is performed so that the rotation speed calculated by the electric compressor rotation speed control means 11 becomes the electric compressor rotation speed control value (RPSmax). Thus, the value added by the rotation speed control (Δ rotation speed) is canceled.

According to the vehicle air conditioner 70 according to the present embodiment, the occurrence of fogging of the windows can be prevented, and noise from the electric motor 8 and the compressor 5 can be eliminated.
Other functions and effects are the same as those of the above-described embodiment, and thus description thereof is omitted here.

A seventh embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIG.
The vehicle air conditioner 80 according to the present embodiment includes, in addition to the target low-pressure calculation means 10 and the electric compressor rotation speed control means 11, an evaporator intake air temperature calculation means 81 and an evaporator intake air temperature correction means inside the air conditioner CPU 3. It differs from the thing of 2nd Embodiment mentioned above by the point that 82 is provided. Since other components are the same as those of the second embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

The evaporator intake air temperature calculation means 81 is connected to the condenser inlet air volume detection means 13, the evaporator inlet air volume detection means 14, the condenser intake air temperature detection means 15, and the low pressure detection means 21, and detects these condenser inlet air volumes. This is a part for calculating the evaporator intake air temperature based on the information from the means 13, the evaporator inlet air volume detection means 14, the condenser intake air temperature detection means 15, and the low pressure detection means 21. The calculated evaporator intake air temperature is output to the evaporator intake air temperature correction means 82.
The evaporator suction air temperature correction means 82 is connected to the evaporator suction air temperature calculation means 81 and the evaporator suction air temperature detection means 16, and from these evaporator suction air temperature calculation means 81 and the evaporator suction air temperature detection means 16. With this information, the above-described evaporator intake air temperature is corrected. Further, the corrected evaporator intake air temperature is output to the target low pressure calculating means 10.

According to the vehicle air conditioner 80 according to the present embodiment, a value obtained by adding a correction to the calculation result of the evaporator intake air temperature calculated based on the pressure on the low pressure side of the refrigeration cycle is used for calculating the target low pressure. Become. That is, since the low-pressure side pressure that is a direct control factor is used as a feedback term for calculating the target low pressure, the evaporator intake air temperature can be easily corrected.
Other functions and effects are the same as those of the above-described embodiment, and thus description thereof is omitted here.

An eighth embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIG.
The vehicle air conditioner 90 according to the present embodiment is different from that of the seventh embodiment described above in that a setting change presence / absence confirmation unit 91 is provided instead of the evaporator intake air temperature calculation unit 81. Since the other components are the same as those of the seventh embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

The setting change presence / absence confirmation means 91 is connected to the inverter 9, the set temperature detection means 12, the inside / outside air setting detection means 40, the blower air volume setting means 41, and the radiator / capacitor fan state detection means 42. Based on information from the temperature detection means 12, the inside / outside air setting detection means 40, the blower air volume setting means 41, and the radiator / condenser fan state detection means 42, it is determined whether or not frost is generated in the evaporator 4. When it is determined that the frost is generated in the evaporator 4, the result is output to the evaporator intake air temperature correction means 82, and the evaporator intake air temperature correction means 82 outputs the above-described evaporator intake air temperature. Correction is added to Further, the corrected evaporator intake air temperature is output to the target low pressure calculating means 10.
Note that it is determined that frost is generated in the evaporator 4 when the following conditions (1) and (2) are satisfied at the same time.
(1) There is no change in each set value for a predetermined time (t) from the present.
(2) The measured value of the low pressure measured by the low pressure detecting means 21 stays within a predetermined range based on the target low pressure (LPt) for a predetermined time (t), and further within the predetermined time (t) The number of revolutions of 8 decreased by a predetermined number of revolutions.

According to the vehicle air conditioner 80 according to the present embodiment, since a self-diagnosis function is added to the frost, it is possible to prevent repeated frosting even in the event of frost.
Other functions and effects are the same as those of the above-described embodiment, and thus description thereof is omitted here.

It is a figure showing a 1st embodiment of an air harmony device by the present invention, and is a block diagram showing the outline composition. It is a figure which shows 2nd Embodiment of the air conditioning apparatus by this invention, Comprising: It is a block diagram which shows the structure of the outline. It is a figure which shows 3rd Embodiment of the air conditioning apparatus by this invention, Comprising: It is a block diagram which shows the structure of the outline. It is a figure which shows 4th Embodiment of the air conditioning apparatus by this invention, Comprising: It is a block diagram which shows the structure of the outline. It is a figure which shows 5th Embodiment of the air conditioning apparatus by this invention, Comprising: It is a block diagram which shows the structure of the outline. It is a figure which shows 6th Embodiment of the air conditioning apparatus by this invention, Comprising: It is a block diagram which shows the structure of the outline. It is a figure which shows 7th Embodiment of the air conditioning apparatus by this invention, Comprising: It is a block diagram which shows the structure of the outline. It is a figure which shows 8th Embodiment of the air conditioning apparatus by this invention, Comprising: It is a block diagram which shows the structure of the outline.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air conditioning apparatus 2 Refrigerating cycle 4 Evaporator 5 Compressor 6 Condenser 7 Expansion valve 8 Electric motor 11 Rotational speed control means 20 Air conditioning apparatus 30 Air conditioning apparatus 50 Air conditioning apparatus 60 Air conditioning apparatus 70 Air conditioning apparatus 80 Air conditioning apparatus 90 Air conditioning apparatus

Claims (3)

A compressor that compresses gaseous refrigerant, a condenser that condenses high-pressure gas refrigerant by exchanging heat with the outside air, and an expansion valve that converts high-temperature and high-pressure liquid refrigerant into low-temperature and low-pressure liquid refrigerant. A refrigeration cycle for supplying refrigerant;
An electric motor for driving the compressor;
An air conditioner comprising a rotation speed control means for controlling the rotation speed of the electric motor,
The air conditioner characterized in that the rotational speed control means controls the rotational speed of the electric motor based on the pressure on the low pressure side of the refrigeration cycle.   The pressure on the low pressure side of the refrigeration cycle is an actual measurement value measured by the low pressure detection means, and the rotational speed control means measures the actual measurement value measured by the low pressure detection means and the target value of the pressure on the low pressure side of the refrigeration cycle. The air conditioner according to claim 1, wherein the rotation speed of the electric motor is controlled based on the air conditioner.   The low-pressure side pressure of the refrigeration cycle is an actual measurement value measured by a low-pressure detection means, and the target value of the low-pressure side pressure of the refrigeration cycle is a condenser inlet air volume, an evaporator inlet air volume, a condenser intake air temperature, and The air conditioner according to claim 1, wherein the air conditioner is calculated based on an evaporator intake air temperature.

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