JPH06219138A - Heat pump type air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To provide a heat pump type air conditioner for a vehicle by which a comfortable blowoff temperature can be obtained and durability and reliability can be improved even under a small heat load environment condition such as the intermediate season. CONSTITUTION:An operation part is provided to control an electric motor driving device 9 to drive an electric motor 8 to operate a compressor 1, and the operation part can input an air-conditioning desired capacity value of an occupant, and controls the electric motor driving device 9 in response to the desired capacity value being inputted. A capacity reducing means is provided to reduce air-conditioning capacity, and the operation part operates the capacity reducing means when the smallest capacity value is inputted, and stops the capacity reducing means when the capacity value larger by a prescribed quantity than the smallest capacity value is inputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner in which a compressor is driven by an electric motor and a vehicle is cooled and heated by a heat pump.

[0002]

2. Description of the Related Art In a conventional fuel-driven automobile air conditioner, for example, as shown in the concrete structure of FIG. After the heat is radiated to the air outside the vehicle compartment by the exchanger 2 and the air blower 3 for the outdoor heat exchanger to condense and liquefy the refrigerant, the refrigerant is guided to the indoor heat exchanger 5 via the refrigerant expansion device 4, and the indoor air blower is supplied. The air blown by 6 was evaporated while cooling and the air-cooling action was performed.

The heating function is to stop the compressor 1 and let the engine cooling water (warm water) flow through the heater core 15 to heat the air blown by the indoor blower 6.

The temperature of the air blown from the vehicle interior air outlets 10, 11, 12 is adjusted by adjusting the opening of the mix damper 16 arranged in the ventilation duct 20.
This is performed by adjusting the amounts of warm air flowing through the heater core 15 and cold air bypassing the heater core 15. Therefore, when the compressor 1 is operated, the temperature of the blown air can be continuously adjusted from warm air to cold air, and heating and cooling can be continuously changed.

Further, as for the automatic adjustment of the vehicle interior temperature, for example, as shown in FIG. 9 as well, the controller 25 controls the vehicle exterior temperature sensor 21, the vehicle interior temperature sensor 22, and the solar radiation amount sensor 2.
3. The mix damper opening degree is calculated based on the information from the set temperature input device 24 and output to the mix damper adjusting actuator 27.

On the other hand, a heat pump type air conditioner for driving a compressor by an electric motor, for example, an air conditioner for an electrically driven automobile is shown in FIG.
It shows in 0. The cooling action is similar to the above, but since there is no cooling water (hot water) for the engine in the heating action, the four-way switching valve 7 is used downstream of the compressor 1 to reverse the refrigerant flow path, and the indoor heat exchanger is used. After heating the air blown by the indoor air blower 6 to condense and liquefy the refrigerant, the refrigerant is guided to the outdoor heat exchanger 2 via the refrigerant expansion device 4, where the air outside the vehicle is cooled. At the same time, heat pump heating is performed in which the refrigerant absorbs heat and evaporates. Therefore, since there is no mix damper like the air conditioner for the fuel-driven automobile, the blowout temperature is controlled by controlling the electric motor drive device 9 that drives the electric motor 8 by the operation unit 30 to adjust the rotation speed of the compressor 1. Do it. Further, switching between heating and cooling is performed by switching the refrigerant flow path using the four-way switching valve 7 by the heating / cooling operation switching device 31.

Further, as for the automatic adjustment of the vehicle interior temperature, for example, as shown in FIG. 11, the information from the vehicle exterior temperature sensor 21, the vehicle interior temperature sensor 22, the solar radiation amount sensor 23, and the set temperature input device 24 is controlled by the controller 25. The heating operation or the cooling operation is determined by and is output to the four-way switching valve drive device 28 to drive the four-way switching valve 7 to perform the heating operation or the cooling operation. Further, the rotation speed of the compressor 1 is calculated and output to the electric motor drive device 9 to adjust the blowout temperature.

[0008]

As described above, in the electrically driven vehicle, the blowout temperature must be adjusted by adjusting the rotation speed of the electric motor (compressor). However, the rotation speed of the electric motor (compressor) that adjusts the heating and cooling capacity cannot be lowered at all to protect the compressor such as by ensuring the circulation of lubricating oil, and the minimum rotation speed is set as the lower limit. Has been done. Therefore, depending on the environmental conditions such as the middle season when the heat load is small, the blowing temperature may be too high and the heating capacity may be excessive during the heating operation even at the lowest rotation speed.

For example, FIG. 7 is a diagram showing the relationship between the vehicle exterior temperature and the number of revolutions and the vehicle interior temperature. Normally, the passenger compartment temperature is 20
Although the temperature is adjusted within the range of 30 ° C to 30 ° C, the vehicle interior temperature exceeds 30 ° C when the vehicle exterior temperature is 20 ° C.

As a measure against this, if the compressor is stopped, the heating capacity becomes zero and it becomes cold. On the other hand, if the stop and operation are repeated, the temperature inside the vehicle can be brought close to the target temperature inside the vehicle, but the blowing temperature is repeatedly high and low, resulting in impaired comfort. Further, the compressor is repeatedly stopped and operated, which is not preferable in terms of durability and reliability.

As an example of excessive heating capacity, FIG. 8 shows an air conditioning operation diagram during heating operation by a conventional vehicle heat pump type air conditioner. FIG. 10: An operation unit 30 in the configuration diagram of the conventional vehicle heat pump type air conditioner or a control unit 25 in the configuration diagram of the conventional vehicle heat pump type air conditioner controls the electric motor drive device 9 for driving the electric motor 8. Thus, the blowout temperature is adjusted by adjusting the rotation speed of the compressor 1. When the air conditioning is started, the temperature inside the vehicle is lower than the target temperature, so the number of revolutions is increased to increase the blowout temperature. When the vehicle interior temperature approaches the target temperature, the rotation speed is reduced. Then, the target temperature is reached. However, the vehicle interior temperature does not reach the target temperature and is maintained at the target temperature, and the target temperature exceeds the target value even at the lower limit minimum rotation speed (minimum rotation speed).

Therefore, as a countermeasure, the compressor is stopped, but the heating capacity becomes zero, so that the vehicle interior temperature becomes lower than the target temperature. Therefore, the vehicle interior temperature is maintained at the target temperature by repeatedly stopping and operating.

However, since the blowing temperature is repeatedly high and low, the comfort is impaired, and the repeated stop and operation of the compressor is disadvantageous in terms of durability and reliability.

A similar situation occurs during the cooling operation. Therefore, the present invention prevents high and low repetition of the blowing temperature even in an environmental condition with a small heat load such as the middle season,
It is an object of the present invention to provide a heat pump type air conditioner for a vehicle that can obtain a comfortable outlet temperature and can improve durability and reliability.

[0015]

In order to solve the above problems, a first aspect of the present invention is to provide a compressor, an electric motor that drives the compressor, and an electric motor drive device that drives the electric motor.
An operation unit for controlling the electric motor drive device, the operation unit being capable of inputting a desired capacity value for heating and cooling of an occupant, and controlling the electric motor drive device to drive the electric motor at a rotation speed corresponding to the input desired capacity value. In a heat pump type air conditioner for a vehicle in which the heating capacity and the cooling capacity can be adjusted by adjusting the rotation speed of the electric motor, a capacity reducing means for lowering the heating and cooling capacity is provided, and the minimum capacity value is input to the operation unit. Then, the capacity reducing means is operated, and when the capacity value larger than the minimum capacity value by a predetermined amount is input, the capacity reducing means is stopped.

As a second means, the present invention provides a compressor, an electric motor for driving the compressor, and a compressor.
An electric motor drive device for driving the electric motor and a control device for controlling the electric motor drive device are provided, and the control device calculates the vehicle interior target temperature based on the environmental condition outside the vehicle interior and the set temperature input of the occupant to determine the vehicle interior environment. Based on the conditions, the electric motor drive device is controlled to drive the electric motor to a rotation speed that allows the vehicle interior temperature to reach and maintain the vehicle interior target temperature, and the vehicle interior temperature is automatically controlled. In a vehicle heat pump type air conditioner capable of adjusting the blown air temperature by means of, a capacity reducing means for reducing the heating / cooling capacity is provided, and the vehicle interior temperature reaches the vehicle interior target temperature and exceeds a predetermined value even at the minimum rotation speed. In that case, the capability reducing means is activated.

In order to solve the above problems, the present invention provides a compressor, an electric motor for driving the compressor, and
An electric motor drive device for driving the electric motor and a control device for controlling the electric motor drive device are provided, and the control device calculates the vehicle interior target temperature based on the environmental condition outside the vehicle interior and the set temperature input of the occupant to determine the vehicle interior environment. Based on the conditions, the electric motor drive device is controlled to drive the electric motor to a rotation speed that allows the vehicle interior temperature to reach and maintain the vehicle interior target temperature, and the vehicle interior temperature is automatically controlled. In a vehicle heat pump type air conditioner capable of adjusting the temperature of the blown air, by providing a capacity reducing means for lowering the heating and cooling capacity, when the heat load determined by the environmental conditions outside the vehicle is small,
When the vehicle interior temperature reaches within a predetermined value with respect to the vehicle interior target temperature, the capacity reducing means is operated.

In order to solve the above-mentioned problems as a fourth means, the present invention relates to the first, second and third means, in which the capacity reducing means of the capacity reducing means is used in accordance with the degree of heat load determined by the environmental condition outside the vehicle compartment. Determine the amount of capacity reduction.

In order to solve the above problem as a fifth means, the present invention is the first, second, third and fourth means, wherein the capacity reducing means bypasses the refrigerant suction side and the discharge side of the compressor. Use as a machine bypass means.

[0020]

According to the first means of the present invention, a compressor, an electric motor for driving the compressor, an electric motor driving device for driving the electric motor, and an operating portion for controlling the electric motor driving device are provided. Is capable of inputting a desired capacity value for heating / cooling of an occupant, and controls an electric motor drive device to drive an electric motor at a rotation speed corresponding to the input desired capacity value.The heating capacity and the cooling capacity are adjusted by adjusting the rotation speed of the electric motor. In a heat pump type air conditioner for a vehicle whose capacity is adjustable, a capacity reducing means for lowering the heating / cooling capacity is provided, and the operation section operates the capacity reducing means when the minimum capacity value is input, and the operation is started from the minimum capacity value. When a quantitatively large ability value is input, the ability reducing means is stopped.

Therefore, in an environmental condition with a small heat load, such as in the middle season, when the air conditioning is started, the vehicle interior temperature is far from the target temperature, so the heating / cooling capacity is increased. When the vehicle interior temperature approaches the target temperature, the heating / cooling capacity is reduced. However, the vehicle interior temperature reaches the target temperature but exceeds the target temperature. Therefore, the occupant further lowers the heating / cooling capacity at the operation unit and inputs the minimum capacity value. Then, the capacity reducing means is activated. As a result, the vehicle interior temperature, which has exceeded the target temperature, returns to the target temperature, and further reaches the target temperature. Therefore, this time, the occupant tries to increase the heating / cooling capacity in the operation unit to reach and maintain the vehicle interior temperature at the target temperature. At this time, the capacity reducing means is operated until a capacity value larger than the minimum capacity value by a predetermined amount is input, so that it becomes possible to maintain the vehicle interior temperature from reaching the target temperature to reaching the target temperature. .

According to the second means of the present invention, a compressor,
An electric motor for driving the compressor, an electric motor driving device for driving the electric motor, and a control device for controlling the electric motor driving device are provided, and the control device is a vehicle interior target temperature based on an environmental condition outside the vehicle interior and an input temperature set by the occupant. Of the vehicle interior temperature based on the environmental conditions of the vehicle interior, to automatically control the vehicle interior temperature by controlling the motor drive device to drive the motor at a rotation speed to reach and maintain the vehicle interior target temperature. In a vehicle heat pump type air conditioner that can adjust the temperature of blown air by adjusting the number of rotations of the electric motor, a capacity reducing means is provided to reduce the heating / cooling capacity, and the temperature inside the vehicle is the target temperature inside the vehicle even at the minimum number of rotations. Is reached and the predetermined value is exceeded, the capability reducing means is activated.

Therefore, in an environmental condition where the heat load is small, such as in the middle season, when the air conditioning is started, the vehicle interior temperature is far from the target temperature, so the control device controls the electric motor drive device to heat and cool. To raise. When the vehicle interior temperature approaches the target temperature, the heating / cooling capacity is reduced. However, the vehicle interior temperature reaches the target temperature but exceeds the target temperature. Therefore,
When the predetermined value is exceeded, the capacity reducing means is activated. As a result, the vehicle interior temperature, which has exceeded the target temperature, returns to the target temperature, and further reaches the target temperature. Therefore, this time, the control device operates so as to increase the heating / cooling capacity and to make the vehicle interior temperature reach and maintain the target temperature. At this time, since the capacity reducing means is still in operation, the temperature inside the vehicle can be made to reach and be maintained at the target temperature since the temperature has not reached the target temperature.

According to the third means of the present invention, a compressor,
An electric motor for driving the compressor, an electric motor driving device for driving the electric motor, and a control device for controlling the electric motor driving device are provided, and the control device is a vehicle interior target temperature based on an environmental condition outside the vehicle interior and an input temperature set by the occupant. Of the vehicle interior temperature based on the environmental conditions of the vehicle interior, to automatically control the vehicle interior temperature by controlling the motor drive device to drive the motor at a rotation speed to reach and maintain the vehicle interior target temperature. In a heat pump type air conditioner for a vehicle in which the blown air temperature can be adjusted by adjusting the rotation speed of the electric motor, a capacity reducing means for lowering the heating and cooling capacity is provided, and when the heat load determined by the environmental conditions outside the vehicle is small. When the vehicle interior temperature reaches within a predetermined value with respect to the vehicle interior target temperature, the capacity reducing means is operated.

Therefore, in an environmental condition with a small heat load such as the middle season, when the air conditioning is started, the vehicle interior temperature is far from the target temperature, so the control device controls the electric motor drive device to heat and cool. To raise. When the vehicle interior temperature approaches the target temperature, the heating / cooling capacity is reduced. Here, when the vehicle interior temperature reaches within a predetermined value with respect to the vehicle interior target temperature, the capacity reducing means is operated. Therefore, the heating / cooling capacity is further lowered, the vehicle interior temperature does not exceed the target temperature, and it is possible to reach and maintain the target temperature.

According to the fourth means of the present invention, in the first, second and third means, the capacity reducing amount of the capacity reducing means is determined according to the degree of the small heat load determined by the environmental condition outside the vehicle compartment. .

Therefore, in the first and second means, in the operation of the capacity reducing means, the smaller the heat load is, the larger the capacity reducing amount becomes, so that the heating / cooling capacity lowering becomes optimum and the target temperature is exceeded. The vehicle interior temperature can reach and be maintained at the target temperature so that the target temperature is not reached.

In the third means, in the operation of the capacity reducing means, the smaller the heat load is, the larger the capacity reducing amount becomes, so that the heating / cooling capacity lowering becomes optimum, and the vehicle interior temperature exceeds the target temperature. It is possible to reach and maintain the target temperature quickly.

According to the fifth means of the present invention, the first, second,
In the means of 3 and 4, the capacity reducing means is a compressor bypass means that bypasses the refrigerant suction side and the discharge side of the compressor, so that the capacity reducing method and the reduction amount adjustment become easy.

In the above, the capacity reducing means is operated when the heating / cooling capacity is low. This is because, if the heating and cooling capacity is high, the energy loss becomes large, and the refrigerant becomes high temperature and high pressure to activate the protection function and stop the heating and cooling operation.

As described above, even in an environmental condition with a small heat load such as the middle season, the operation of the capacity reducing means is suppressed to the necessary minimum to minimize the energy loss, and the cooling and heating operation stop due to the operation of the protection function is prevented. It is possible to prevent repetition of high and low blowout temperatures, obtain a comfortable blowout temperature, and improve durability reliability.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings, in which the capacity reducing means is a compressor bypass means and a heating operation is performed.

FIG. 1 is a block diagram of a vehicle heat pump type automatic air conditioner according to an embodiment of the present invention. Here, the difference from the configuration diagram of the conventional heat pump type automatic air conditioner for a vehicle shown in FIG. 11 is that the embodiment of the present invention is the ability reducing means for lowering the heating and cooling ability as compared with the conventional example of FIG. The point is that a certain compressor bypass device 29 is added.

FIG. 2 shows a block diagram of a heat pump type manual air conditioner for a vehicle according to an embodiment of the present invention. Here, the difference from the configuration diagram of the conventional heat pump type manual air conditioner for a vehicle shown in FIG. 10 is that the embodiment of the present invention reduces the heating / cooling capacity in the same manner as described above as compared with the conventional example of FIG. The point is that a compressor bypass device 29, which is a capacity reducing means, is added.

In the case of heating, the four-way switching valve 7 is set by the four-way switching valve drive device 28 as shown by the solid lines in FIGS. The discharged refrigerant is guided to the indoor heat exchanger 5 by the compressor 1. Next, the air blown by the indoor air blower 6 is heated to condense and liquefy the refrigerant, which is then conveyed to the outdoor heat exchanger 2 via the refrigerant expansion device 4 and blown by the outdoor heat exchanger air blower 3. Cool the air and evaporate.

FIG. 3 shows an air conditioning operation diagram according to the first embodiment of the present invention. The operation according to the first means of the present invention will be described by the solid line in FIG.

Under an environmental condition with a small heat load, such as the middle season, when the air conditioning is started, the vehicle interior temperature is far from the target temperature, so the heating capacity is increased. Therefore, both the blowout temperature and the compressor rotation speed are high. When the vehicle interior temperature approaches the target temperature, the heating capacity is reduced, so the temperature decreases with the blowout temperature and the compressor speed. However, because of the environmental condition with a small heat load, the vehicle interior temperature reaches the target temperature, but exceeds the target temperature, and becomes higher than the target temperature. Therefore, at point A, the occupant further lowers the heating capacity at the operation unit and the minimum capacity value is input, and the compressor bypass device 29 operates. As a result, the blow-out temperature becomes lower, so that the vehicle interior temperature that was higher than the target temperature returns to the target temperature, and further becomes lower than the target temperature. Therefore, this time, at point B, the occupant raises the blowout temperature by increasing the heating capacity in the operation unit and increasing the compressor rotation speed, and the passenger compartment temperature is made to reach and be maintained at the target temperature. At this time, since the compressor bypass device 29 is operated until a capacity value larger than the minimum capacity value by a predetermined amount is input, it is possible to reach and maintain the target temperature from a state where the vehicle interior temperature is lower than the target temperature. It will be possible.

The operation of the second means of the present invention will be described with reference to the solid line in FIG. Basically, the operation is the same as that of the first means.

In an environmental condition with a small heat load such as the middle season, when the air conditioning is started, the vehicle interior temperature is far from the target temperature, so the control device controls the electric motor drive device to increase the heating capacity. . Therefore, both the blowout temperature and the compressor rotation speed are high. When the vehicle interior temperature approaches the target temperature, the heating capacity is lowered, so both the blowout temperature and the compressor rotation speed are lowered. However, because of the environmental conditions with a small heat load,
Although the vehicle interior temperature reaches the target temperature, it exceeds and exceeds the target temperature. Therefore, when the predetermined value is exceeded at point A, the compressor bypass device 29 operates. As a result, the blow-out temperature becomes lower, so that the vehicle interior temperature that exceeds the target temperature and becomes higher than the target temperature returns to the target temperature, and further becomes lower than the target temperature. Therefore, this time, at the point B, the control device operates so as to increase the heating capacity and increase the compressor rotation speed to raise the blowout temperature, and to reach and maintain the vehicle interior temperature at the target temperature. At this time, since the compressor bypass device 29 is still in operation, it is possible to reach and maintain the target temperature from a state where the vehicle interior temperature is lower than the target temperature.

FIG. 4 shows an air conditioning operation diagram according to the second embodiment of the present invention. The operation of the third means of the present invention will be described with the solid line in FIG.

Under environmental conditions with a small heat load, such as the middle season, when the air conditioning is started, the vehicle interior temperature is farther than the target temperature, so the control device controls the electric motor drive device to increase the heating capacity. . Therefore, both the blowout temperature and the compressor rotation speed are high. When the vehicle interior temperature approaches the target temperature, the heating capacity is lowered, so both the blowout temperature and the compressor rotation speed are lowered. At point C, the compressor bypass device 29 is operated when the vehicle interior temperature reaches within a predetermined value with respect to the vehicle interior target temperature. Therefore, the heating capacity is further lowered and the blowout temperature is greatly lowered, so that the vehicle interior temperature does not exceed the target temperature. Further, at the point D, the control device operates so that the heating capacity is increased and the compressor rotation speed is increased to raise the blow-out temperature to reach and maintain the vehicle interior temperature at the target temperature. At this time, the compressor bypass device 29
Remains on, it is possible to reach and maintain the target temperature from a state where the vehicle interior temperature is lower than the target temperature.

FIG. 5 is a diagram showing the bypass amount during heating operation which is determined by the vehicle exterior temperature and the amount of solar radiation, and FIG. 6 is a diagram showing the bypass amount during cooling operation which is determined by the vehicle outside temperature and the amount of solar radiation.

FIG. 5 shows that the compressor bypass amount is increased under the environmental conditions where the vehicle exterior temperature is high and the solar radiation amount is large and the heating heat load is small, and the compressor bypass amount is under the environmental conditions where the vehicle exterior temperature is low and the solar radiation amount is small and the heating heat load is large. It shows that it is made small.

FIG. 6 shows that the compressor bypass amount is made small under the environmental conditions where the vehicle exterior temperature is high and the amount of solar radiation is large and the cooling heat load is large, and the compressor bypass amount is provided under the environment conditions where the vehicle outside temperature is low and the amount of solar radiation is small and the cooling heat load is small. Is shown to be larger.

The operation according to the fourth means of the present invention is shown by the dotted lines in FIGS. In FIG. 5, the optimum compressor bypass amount during heating operation is determined.

Therefore, after the compressor bypass device 29 is activated, the vehicle interior temperature reaches and is maintained at the target temperature, and heating is performed by the occupant's operation unit at point B according to the first means of the present invention. It is not necessary to raise the outlet temperature by increasing the capacity and increasing the compressor speed. Further, it becomes unnecessary to increase the blowout temperature by increasing the heating capacity of the control device at point B and increasing the compressor rotation speed by the second means of the present invention. Further, it is not necessary to increase the blowout temperature by increasing the heating capacity of the control device at point D and increasing the compressor rotation speed by the third means of the present invention.

The air-conditioning operation diagram when the compressor bypass device 29 is not operated is shown by broken lines in FIGS. 3 and 4.

In the above description, the compressor bypass device is used as the capacity reducing means, but as other means, opening / closing of the heat insulator for controlling the heat of the compressor to improve the capacity, adjustment of the electric expansion valve, and to the heat exchanger. Various methods such as adjusting the air flow rate are possible.

Various arrangements, numbers, and configurations of heat exchangers can be applied within the scope of the present invention.

[0050]

According to the first aspect of the present invention, the vehicle interior temperature reaches the target temperature but is exceeded under environmental conditions with a small heat load such as the middle season. Therefore, the occupant further lowers the heating / cooling capacity at the operation unit and inputs the minimum capacity value. Then, the capacity reducing means is activated. This allows
The cabin temperature that had exceeded the target temperature returns to the target temperature,
Furthermore, the target temperature is not reached. Therefore, this time, the occupant tries to increase the heating / cooling capacity in the operation unit to reach and maintain the vehicle interior temperature at the target temperature. At this time, the capacity reducing means is operated until a capacity value larger than the minimum capacity value by a predetermined amount is input, so that the vehicle interior temperature is below the target temperature,
It is possible to reach and maintain the target temperature.

Therefore, according to the present invention, even in an environmental condition where the heat load is small, such as in the middle season, the operation of the capacity reducing means is minimized to minimize energy loss, and the cooling and heating operation is stopped by the operation of the protection function. It is possible to prevent repeated rise and fall of the blowing temperature, obtain a comfortable blowing temperature, and improve the durability and reliability.

In the second aspect, the vehicle interior temperature reaches the target temperature but is exceeded under environmental conditions with a small heat load such as the middle season. Therefore, when the predetermined value is exceeded, the capacity reducing means is activated. As a result, the vehicle interior temperature, which has exceeded the target temperature, returns to the target temperature, and further reaches the target temperature. Therefore, this time, the control device operates so as to increase the heating / cooling capacity and to make the vehicle interior temperature reach and maintain the target temperature. At this time, since the capacity reducing means is still in operation, the temperature inside the vehicle can be made to reach and be maintained at the target temperature since the temperature has not reached the target temperature.

Therefore, the same effect as that of the first aspect can be obtained. In the third aspect, when the vehicle interior temperature reaches within the predetermined value with respect to the vehicle interior target temperature under an environmental condition with a small heat load such as an intermediate season, the capacity reducing means is activated. Therefore, the heating / cooling capacity is further lowered, the vehicle interior temperature does not exceed the target temperature, and it is possible to reach and maintain the target temperature.

Therefore, in addition to the same effects as those of claims 1 and 2, it becomes possible to reach and maintain the target temperature faster than those of claims 1 and 2, and in the vicinity of the target temperature of the passenger compartment temperature. Fluctuations can be suppressed.

According to a fourth aspect of the present invention, in the environmental condition with a small heat load such as an intermediate season, in the means of the first and second aspects, in the operation of the capacity reducing means, the smaller the heat load is, the larger the capacity reducing amount is. As a result, the decrease in the heating / cooling capacity is optimized, and the vehicle interior temperature that has exceeded the target temperature can reach and be maintained at the target temperature so that the target temperature is not reached.

According to the third aspect of the present invention, in the operation of the capacity reducing means, the smaller the heat load is, the larger the capacity reducing amount is, so that the heating / cooling capacity lowering becomes optimum, and the vehicle interior temperature exceeds the target temperature. It is possible to reach and maintain the target temperature promptly without being lost.

Therefore, the same effects as those of claims 1, 2, and 3 can be obtained, and in addition, the vehicle interior temperature can be quickly reached and maintained at the target temperature.

According to a fifth aspect, in the means of the first, second, third and fourth aspects, the capacity reducing means is a compressor bypass means for bypassing the refrigerant suction side and the discharge side of the compressor, thereby reducing the capacity. The method and adjustment of the reduction amount become easy.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a vehicle heat pump type automatic air conditioner according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a vehicle heat pump type manual air conditioner according to an embodiment of the present invention.

FIG. 3 is a waveform diagram showing an air conditioning operation according to the first embodiment of the present invention.

FIG. 4 is a waveform diagram showing an air conditioning operation according to the second embodiment of the present invention.

FIG. 5 is a characteristic diagram showing a bypass amount during heating operation, which is determined by a vehicle outside temperature and an amount of solar radiation.

FIG. 6 is a characteristic diagram showing a bypass amount during cooling operation, which is determined by a vehicle outside temperature and an amount of solar radiation.

FIG. 7 is a characteristic diagram showing a relationship between a vehicle exterior temperature and a rotation speed and a vehicle interior temperature.

FIG. 8 is a waveform diagram showing an air conditioning operation by a conventional vehicle heat pump air conditioner.

FIG. 9 is a block diagram of a conventional automatic air conditioner for a vehicle driven by a fuel engine.

FIG. 10 is a configuration diagram of a conventional vehicle heat pump type air conditioner.

FIG. 11 is a block diagram of a conventional vehicle heat pump type automatic air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Outdoor heat exchanger 3 Blower for outdoor heat exchanger 4 Refrigerant expansion device 5 Indoor heat exchanger 6 Indoor blower 7 Four-way switching valve 8 Electric motor 9 Electric motor drive 10 Vent outlet 11 Heat outlet 12 Defrost blow Outlet 13 Vent / heat air outlet switching damper 14 Defrost air outlet damper 15 Heater core 16 Mix damper 17 Outside air introducing port 18 Vehicle interior air introducing port 19 Introducing air switching damper 20 Ventilation duct 21 Vehicle outside temperature sensor 22 Vehicle interior temperature sensor 23 Solar radiation sensor 24 Set temperature input device 25 Control device 26 Engine 27 Mix damper adjustment actuator 28 Four-way switching valve drive device 29 Compressor bypass device 30 Operating part 31 Heating / cooling operation switching device

Claims (5)

[Claims] 1. A compressor, an electric motor for driving the compressor, an electric motor drive device for driving the electric motor, and an operation unit for controlling the electric motor drive device, wherein the operation unit sets a desired heating / cooling capacity value of an occupant. A heat pump for a vehicle that can be input and that controls an electric motor drive device to drive an electric motor to a rotational speed corresponding to a desired capacity value that is input, and that can adjust heating capacity and cooling capacity by adjusting the rotational speed of the electric motor. In the air conditioner, a capacity reducing means for lowering the heating / cooling capacity is provided, and when the minimum capacity value is input to the operation section, the capacity reducing means is activated, and when a capacity value larger than the minimum capacity value by a predetermined amount is input. A heat pump type air conditioner for a vehicle, characterized in that the capacity reducing means is stopped. 2. A compressor, an electric motor for driving the compressor, an electric motor drive device for driving the electric motor, and a control device for controlling the electric motor drive device. The control device is for environmental conditions outside a vehicle compartment and occupant settings. The target temperature inside the vehicle is calculated based on the temperature input, and the motor drive device is controlled to drive the motor at a rotation speed that allows the temperature inside the vehicle to reach and maintain the target temperature inside the vehicle based on the environmental conditions inside the vehicle. In a vehicle heat pump type air conditioner capable of automatically controlling the temperature inside the vehicle and adjusting the blown air temperature by adjusting the number of revolutions of the electric motor, a capacity reducing means for reducing the heating and cooling capacity is provided,
A heat pump type air conditioner for a vehicle, wherein the capacity reducing means is operated when the vehicle interior temperature reaches the vehicle interior target temperature and exceeds a predetermined value even at the minimum rotation speed. 3. A compressor, a motor for driving the compressor, an electric motor drive device for driving the electric motor, and a control device for controlling the electric motor drive device, wherein the control device is for environmental conditions outside the vehicle compartment and occupant settings. The target temperature inside the vehicle is calculated based on the temperature input, and the motor drive device is controlled to drive the motor at a rotation speed that allows the temperature inside the vehicle to reach and maintain the target temperature inside the vehicle based on the environmental conditions inside the vehicle. In a vehicle heat pump type air conditioner capable of automatically controlling the temperature inside the vehicle and adjusting the blown air temperature by adjusting the number of revolutions of the electric motor, a capacity reducing means for reducing the heating and cooling capacity is provided,
A heat pump type air conditioner for a vehicle, characterized in that when the heat load determined by the environmental conditions outside the vehicle interior is small and the vehicle interior temperature reaches within a predetermined value with respect to the vehicle interior target temperature, the capacity reducing means is operated. apparatus. 4. The heat pump for a vehicle according to claim 1, wherein the capacity reducing amount of the capacity reducing means is determined according to a degree of a small heat load determined by an environmental condition outside the vehicle compartment. Air conditioner. 5. The heat pump type air conditioner for a vehicle according to claim 1, wherein the capacity reducing means is a compressor bypass means for bypassing a refrigerant suction side and a discharge side of the compressor. .