JP3360406B2 - Heat pump type air conditioner for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump for a vehicle having a vapor compression refrigeration cycle for heating / cooling conditioned air by circulating refrigerant discharged from a compressor through a heat exchanger outside the vehicle compartment and a heat exchanger inside the vehicle compartment. The present invention relates to a heating and cooling system.

[0002]

2. Description of the Related Art As a conventional heat pump type air conditioner for a vehicle of this type, for example, those disclosed in JP-A-2-290475 and JP-A-2-130808 are known. Hereinafter, the cooling and heating device disclosed in JP-A-2-290475 will be described with reference to FIG.

In FIG. 7, in this cooling / heating device, during a heating operation, the four-way valve 2 is switched as shown by a solid line, and the refrigerant is compressed from the compressor 1 → the four-way valve 2 → the first vehicle interior heat exchanger 3 →
Heat exchanger 4 for heating → heat exchanger 5 for the second cabin → expansion valve 6 →
It circulates from the heat exchanger outside the vehicle 7 → the four-way valve 2 → the receiver 8 → the compressor 1. At that time, the first vehicle interior heat exchanger 3 radiates the heat of the high-temperature refrigerant discharged from the compressor 1 to the air introduced by the blower fan 9 to generate warm air for vehicle interior heating, and heat exchange for heating. The heat exchanger 4 absorbs waste heat from the engine 10 into the refrigerant, and the second vehicle interior heat exchanger 5 radiates the heat of the refrigerant to the air introduced by the blower fan 11 to produce warm air for vehicle interior heating. . Further, the heat exchanger 7 outside the vehicle is a fan 1
The heat of the outside air introduced in 2 is absorbed by the refrigerant.

On the other hand, during the cooling operation, the four-way valve 2 is switched as shown by the dotted line, and the refrigerant is compressed by the compressor 1 → the exterior heat exchanger 7 → the expansion valve 6 → the second interior heat exchanger 5 → the first interior heat. Exchanger 3 → Four-way valve 2 → Receiver 8 → Compressor 1
And circulate. At this time, the exterior heat exchanger 7 radiates heat of the high-temperature refrigerant discharged from the compressor 1 to the outside air, and the first and second interior heat exchangers 3 and 5 are blower fans 9 and 11.
The heat of the introduced air is radiated to the refrigerant to produce cold air for cooling the vehicle interior.

[0005] However, the above-mentioned conventional heat pump type air conditioner has the following problems. The vehicle interior heat exchangers 3 and 5 perform heating by radiating the total amount of heat absorbed by the refrigerant outside the vehicle interior heat exchanger 7 and the work amount of the compressor 1 to air during the heating operation. Outside heat exchanger 7
Has a structure in which heat of the outside air is absorbed by the refrigerant, so that the amount of heat absorbed by the refrigerant is low when the temperature is low outside air, when the vehicle is running, or when it is raining or snowing, and the work of the compressor 1 is constant at this time. Inevitably, the in-vehicle heat exchangers 3,5
The amount of heat dissipated by the heater decreases, and the heating capacity decreases. In addition, when the outside air temperature is low, a frosting phenomenon easily occurs on the heat exchanger 7 outside the vehicle compartment, and the number of times of the defroster operation increases, so that a stable heating operation cannot be performed. During the heating operation, the engine 1
Since it is configured to absorb the waste heat from zero to generate warm air for heating the vehicle interior, it is not suitable for vehicles having no large heat source such as solar cars and electric cars.

In order to solve such a problem, the present inventors have proposed a heat pump type air conditioner for a vehicle in which a heat exchanger for heat absorption and a heat exchanger for heat radiation are provided in a vehicle cabin. (Japanese Patent Application No. 3-34595). This cooling and heating device has at least two heat exchangers in the vehicle interior (first and first heat exchangers).
(A second heat exchanger inside the vehicle compartment) and at least one heat exchanger outside the vehicle compartment, and the first and second heat exchangers inside the vehicle compartment are not used during the heating operation without using the heat exchanger outside the vehicle compartment. And heat sink. Then, dehumidifying and heating are performed while cooling the first heat exchanger for heat dissipation with the conditioned air cooled by the second heat exchanger for heat absorption. On the other hand, during the cooling operation, the heat exchanger outside the vehicle compartment and the heat exchanger inside the first vehicle compartment are used as a radiator, and the heat exchanger inside the second vehicle compartment is used as a heat absorber. In this way, when the vehicle interior heat exchanger is used as a heat absorber during the heating operation, the amount of heat absorbed by the refrigerant is increased even at a low outside air temperature as compared with the case where the exterior heat exchanger is used as a heat absorber. Heating performance can be improved.

[0007]

By the way, as described above, in the configuration in which the first cabin heat exchanger is heated while being cooled by the conditioned air cooled by the second cabin heat exchanger, the first cabin is heated. If the cooling performance of the heat exchanger decreases, the refrigeration cycle may become unstable. Therefore, the above-mentioned Japanese Patent Application No. Hei.
In the heat pump type cooling and heating device in the specification of US Pat.
The intake door opening, blower fan airflow, air mix door opening, compressor speed, etc. are automatically controlled so that satisfactory cooling and heating performance can be obtained when the refrigeration cycle is stable. If the occupant manually commands the blower fan air volume and air outlet during automatic control, the air volume and air outlet according to the command are set with priority, and the compressor speed is set according to the set air volume and air outlet. Fixed to the rotation speed.

However, when the air volume and the air outlet are manually set as described above, the refrigeration cycle may become unstable or the cooling / heating performance may be reduced. For example, when the intake air load (for example, air temperature) of the heat absorbing vehicle interior heat exchanger is increased by manually setting the air flow during the heating operation, the compressor of which the rotation speed is fixed according to the air flow is increased. The discharge pressure and the discharge temperature rise and the refrigeration cycle becomes unstable, and in some cases, the compressor may be stopped for cycle protection. Conversely, if the suction air load of the heat-absorbing heat exchanger in the vehicle interior decreases due to the manual setting of the air volume, the heating capacity will be insufficient and the passengers will not be able to warm up even if the set temperature in the vehicle interior is increased. In addition, there is a possibility that the dehumidification performance is reduced and window fogging occurs.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat pump type air conditioner for a vehicle which can maintain a refrigeration cycle in a stable state or a state in which a satisfactory air conditioning capacity can be obtained while maintaining an air flow and an air outlet according to a manual operation. To provide.

[0010]

Means for Solving the Problems The inventions of claims 1 to 5 are:
Air-conditioning air generating means for generating air-conditioning air to be blown into the vehicle interior, a compressor for pumping the refrigerant, an external heat exchanger connected to the refrigerant discharge side of the compressor and radiating heat of the refrigerant to the outside air, and a compressor. A heat-dissipating cabin heat exchanger that is connected to the refrigerant discharge side of the heat-dissipating radiator and radiates the heat of the refrigerant to the conditioned air to generate warm air, An expansion means for expanding, connected to a refrigerant outflow side of the expansion means and a refrigerant inflow side of the compressor, and transfers the heat of the conditioned air through at least one of the exterior heat exchanger and the heat radiation interior heat exchanger. A heat-absorbing interior heat exchanger that absorbs the refrigerant adiabatically expanded by the expansion means to generate cool air, a refrigerant pipe that guides the refrigerant discharged from the compressor to the exterior heat exchanger, and a refrigerant that guides the heat-radiation interior heat exchanger. Set at the branch point with the pipeline During cooling operation, refrigerant flow switching is performed by guiding the refrigerant discharged from the compressor to at least the exterior heat exchanger during heating operation, and during heating operation, guiding the refrigerant discharged from the compressor to the heat radiation interior heat exchanger by bypassing the exterior heat exchanger. Means for a vehicle heat pump type air conditioner. According to the first aspect of the present invention, at least one of the suction air load of the heat absorbing vehicle interior heat exchanger, the blowing air load of the heat absorbing vehicle interior heat exchanger, and the blowing air load of the heat radiation vehicle interior heat exchanger is determined. Detecting means for detecting as a physical quantity indicating the state of the refrigeration cycle, determining means for determining whether the detection output of the detecting means is higher than a preset upper limit, When set according to the manual operation, the number of revolutions of the compressor is set according to the air flow rate of the air-conditioning air generation means, and at this time, the detection output of the detection means is determined to be higher than a preset upper limit value. If so, control means is provided for reducing the suction air load of the heat exchanger for heat absorption in the vehicle interior, thereby solving the above problems. The invention according to claim 2 is configured such that, when the air blowing amount of the conditioned air generating means is set according to the manual operation during the heating operation, and the detection output of the detecting means is determined to be higher than the upper limit value, The higher the detection output, the lower the compressor rotation speed.
According to a third aspect of the present invention, there is provided a vehicle including the above-described air-conditioning wind generating means, a compressor, a heat exchanger outside the vehicle compartment, a heat exchanger for heat radiation inside the vehicle, an expansion means, a heat exchanger for heat absorption inside the vehicle, and a refrigerant flow switching means. It is applied to heat pump type cooling and heating equipment. Detecting means for detecting at least one of an intake air load of the heat absorbing vehicle interior heat exchanger, a blowing air load of the heat absorbing vehicle interior heat exchanger, and a blowing air load of the heat radiating vehicle interior heat exchanger; Determining means for determining whether or not the detection result of the means is lower than a preset lower limit; and, when the air flow rate of the air-conditioning air generating means is set according to a manual operation during the heating operation, the air-conditioning air generating means In addition to setting the rotation speed of the compressor in accordance with the amount of air blown, if the detection output of the detection means is determined to be lower than a preset lower limit at this time, the suction air of the heat absorbing vehicle interior heat exchanger is Control means for increasing the load. In the invention according to claim 4, when the air flow rate of the conditioned air generating means is set according to the manual operation during the heating operation and the detection output of the detecting means is determined to be lower than the lower limit value, The compressor rotation speed is maintained at a predetermined value or more regardless of the detection output. The invention according to claim 5 is an air mixing door for adjusting the amount of air passing through the heat exchanger for heat dissipation, a target outlet temperature, a load of air blown by the heat exchanger for heat absorption, and a heat exchanger for heat dissipation. Computing means for computing the minimum air mix door opening based on at least one of the vehicle interior blowout temperature calculated from the blown air load and the operating state of the heat radiating vehicle interior heat exchanger. Sometimes, when the bi-level mode in which the conditioned air is blown into the passenger compartment from both the vent outlet and the foot outlet is manually set, the suction air load of the heat absorbing passenger compartment heat exchanger is set in advance. The intake air load is controlled so as to approach the target value, and the air mixing door is adjusted to the maximum opening at which the amount of air passing through the heat-exchange vehicle interior heat exchanger is the maximum and the minimum air mixing door opening calculated above. It is obtained so as to control drive between. The invention according to claim 6 is the above-described air-conditioning wind generating means, compressor, heat exchanger outside the vehicle compartment, heat exchanger inside the vehicle interior for heat dissipation, expansion means, heat exchanger inside the vehicle interior for heat absorption, refrigerant flow switching means, and heat dissipation vehicle. The present invention is applied to a heat pump type air conditioner for a vehicle having an air mix door for adjusting an amount of air passing through an indoor heat exchanger. And the target outlet temperature,
Based on at least one of the vehicle interior blowout temperature calculated from the blown air load of the heat absorbing vehicle interior heat exchanger and the blown air load of the heat dissipation vehicle interior heat exchanger, and the operating state of the heat dissipation vehicle interior heat exchanger. Calculating means for calculating the minimum air-mixing door opening degree, detecting means for detecting a physical quantity indicating a state of a refrigeration cycle composed of a compressor, a heat exchanger, expansion means and refrigerant flow switching means, and detected physical quantity Means for determining whether or not the refrigeration cycle is in an unstable state or a capacity insufficiency state on the basis of the air flow rate of the air-conditioning air generating means is set according to a manual operation, and a vent outlet and a foot blower are provided. During the heating operation in which the bi-level mode in which the conditioned air is blown into the passenger compartment from both the exits is not set by manual operation, the refrigeration cycle is determined to be in an unstable state or a non-operational state by the determination means. If it is determined that the insufficient state,
In order to avoid such a state, at least one of the suction air load of the heat absorbing vehicle interior heat exchanger, the number of rotations of the compressor, and the amount of air passing through the heat releasing vehicle interior heat exchanger is controlled, and the bi-level mode is manually operated. Is set, the air intake load of the heat absorbing vehicle interior heat exchanger is controlled so as to approach a preset target value, regardless of whether or not the air flow is manually set. Control means is provided for controlling the driving of the mixing door between the maximum opening at which the amount of air passing through the heat-dissipating interior heat exchanger is the largest and the calculated minimum air mixing door opening.

[0011]

According to the first aspect of the present invention, at least one of the suction air load of the heat absorbing vehicle interior heat exchanger, the blowing air load of the heat absorbing vehicle interior heat exchanger, and the blowing air load of the heat radiation vehicle interior heat exchanger. It is determined whether or not is higher than a preset upper limit value. When the air flow rate of the air-conditioning air generating means is set according to the manual operation during the heating operation, the rotation speed of the compressor is set according to the air blowing amount of the air-conditioning air generating means. Is determined to be higher than a preset upper limit,
The suction air load of the heat exchanger for heat absorption inside the vehicle is reduced. According to the second aspect of the present invention, when the air blowing amount of the conditioned air generating unit is set according to the manual operation during the heating operation and the detection output of the detecting unit is determined to be higher than the upper limit value,
The higher the detection output of the detection means, the lower the compressor rotation speed. According to the third aspect of the present invention, the output of the detection means includes the intake air load of the heat absorbing vehicle interior heat exchanger, the blowing air load of the heat absorbing vehicle interior heat exchanger, and the blowing air load of the heat releasing vehicle interior heat exchanger. It is determined whether at least one of them is lower than a preset lower limit. And
When the air volume of the air-conditioning air generating means is set according to the manual operation during the heating operation, the number of revolutions of the compressor is set according to the air volume of the air-conditioning air generating means, and at this time, the detection result of the detecting means is preset. If it is determined that the lower limit is lower than the lower limit, the suction air load of the heat absorbing vehicle interior heat exchanger increases. According to the fourth aspect of the present invention, when the air flow rate of the conditioned air generating means is set according to the manual operation during the heating operation, and the detection output of the detecting means is determined to be lower than the lower limit, the detecting means , The compressor speed is maintained at a predetermined value or more.

According to the fifth aspect of the present invention, the minimum air mix door opening is calculated based on the target outlet temperature and the like.
When the bi-level mode is set by a manual operation during the heating operation, the suction air load of the heat absorbing vehicle interior heat exchanger is controlled to approach a preset target value, and the air mixing door is controlled. Is controlled between the maximum opening and the minimum air mix door opening. According to the sixth aspect of the present invention, the amount of air blown by the conditioned air generating means is set according to a manual operation, and the bi-level mode in which the conditioned air is blown into the vehicle compartment from both the vent outlet and the foot outlet is manually set. If it is determined that the refrigeration cycle is in an unstable state or a capacity shortage state during a heating operation not set by the operation, the suction air load of the heat absorbing vehicle interior heat exchanger and the number of rotations of the compressor are determined in order to avoid the state. And at least one of the amount of air passing through the heat exchanger for heat dissipation in the vehicle interior is controlled. Also, when the bi-level mode is set by manual operation, regardless of whether or not the air volume is set by manual operation, the suction air load of the heat absorbing vehicle interior heat exchanger approaches the preset target value. In addition to controlling the load, the air mix door is driven and controlled between the maximum opening at which the amount of air passing through the heat-dissipating interior heat exchanger is the largest and the calculated minimum air mix door opening. That is, when both the air flow rate of the conditioned air generation means and the bi-level mode are set by manual operation, the control at the time of manually setting the bi-level mode has priority.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of a vehicle heat pump type air conditioner according to the present invention. The compressor 31 is installed at a location outside the vehicle compartment such as an engine room, and a compressor whose rotation speed can be changed, such as an electric compressor or a hydraulically driven compressor, is used. This compressor 3
1 on the discharge side via a three-way valve 32.
8 is connected to the heat exchanger 38 outside the vehicle compartment, and the heat exchanger 33 for heat radiation inside the vehicle compartment is connected via a check valve 70.

The external heat exchanger 38 is provided outside the vehicle compartment, such as an engine room, and serves as a vehicle external condenser that radiates heat of the refrigerant discharged from the compressor 31 to the air. The heat-dissipating vehicle interior heat exchanger 33 is provided in a duct 39 arranged at the front of the vehicle interior, such as the back side of the instrument panel, and dissipates heat of the refrigerant discharged from the compressor 31 to the air. Is done.

During the heating operation, the three-way valve 32 is set to the flow path switching state shown by the dotted line, and at this time, the refrigerant discharge side of the compressor 31 is radiated through the bypass pipe 150, that is, bypasses the heat exchanger 38 outside the vehicle compartment. Car heat exchanger 3
3 is connected to the refrigerant inflow side. On the other hand, during cooling operation, the three-way valve 32 is in the flow path switching state shown by the solid line, and at this time, the discharge side of the compressor 31 is connected to the refrigerant inflow side of the exterior heat exchanger 38. The check valve 70 prevents the refrigerant from flowing back from the heat-dissipating interior heat exchanger 33 to the exterior heat exchanger 38.

The refrigerant outflow side of the heat radiating vehicle interior heat exchanger 33 is connected to the refrigerant inflow side of the heat absorbing vehicle interior heat exchanger 35 via a liquid tank 36 and an expansion valve 34. The expansion valve 34 adiabatically expands the liquid refrigerant from the heat-dissipating interior heat exchanger 33 into a mist to flow into the heat-absorbing interior heat exchanger 35. The heat absorbing passenger compartment heat exchanger 35 is an evaporator that absorbs the heat of the air passing therethrough into the refrigerant flowing from the expansion valve 34 to generate cool air. The refrigerant outflow side of the heat absorbing vehicle interior heat exchanger 35 is connected to the refrigerant inflow side of the compressor 31.

The air-conditioning duct 39 is provided with a blower fan 37 driven by a blower fan motor 44, and also has an inside air introduction pipe 40 for introducing vehicle interior air, and an outside air introduction pipe 41 for receiving outside air under running wind pressure. At the boundary between the outside air introduction pipe 41 and the air conditioning duct 39, an intake door 42 for adjusting the ratio of the amount of air introduced into the vehicle interior to the outside air is provided. The outside air and the inside air introduced from the introduction pipes 40 and 41 are sent to the heat absorbing vehicle interior heat exchanger 35 side by the blower fan 37, and this heat exchanger 35
Is cooled when passing through.

In the air conditioning duct 39, an air mix door 46 is provided between the heat exchanger 33 for heat dissipation and the heat exchanger 35 for heat absorption. The air mix door 46 is driven to open and close by an air mix door actuator (not shown) driven by the control device 43, and the amount of air to be heated by passing through the heat exchanger 33 for heat dissipation and the heat generated by the heat in the vehicle interior for heat dissipation. The blowing temperature is adjusted by adjusting the mixture ratio (air volume distribution) with the amount of air that has been cooled while bypassing the exchanger 33. Here, the air mix door opening degree Xmix indicating the opening degree of the air mix door 46 is determined when the air mix door 46 is at the position indicated by the dashed line, that is, when the air volume distribution between the cool air and the hot air is 100% cold air. 0% (fully closed), when the air mix door 46 is at the position indicated by the two-dot chain line, that is, when the air volume distribution between the cold air and the hot air is 100%,
0% (fully open).

The heat exchanger 3 for radiating heat in the air conditioning duct 39
Downstream from 3, an air mix chamber 47 is provided as a room for sufficiently mixing the cold air and the hot air to produce conditioned air at an appropriate temperature. The air mix chamber 47 has a ventilator outlet 51 for blowing conditioned air toward the upper body of the occupant, a foot outlet 52 for blowing conditioned air toward the feet of the occupant, and a conditioned air for blowing toward the front window. A ventilator door 55 for opening and closing the ventilator outlet 51, a foot door 56 for opening and closing the foot outlet 52, and a defroster door 57 for opening and closing the defroster outlet 53 are provided. . The ventilator door 55, the foot door 56, and the defroster door 57 (hereinafter, collectively referred to as a mode door) are driven by a mode door actuator (not shown) driven by the control device 43.

A circulation passage 71 communicating with the inside air introduction pipe 40 is connected to the air mix chamber 47.
An opening 72 from the circulation passage 71 to the air mix chamber 47 is provided with an entrance door 74 of the circulation passage 71, and a branch 73 between the circulation passage 71 and the inside air introduction pipe 40 is provided with an exit door 75. Is provided. Entrance side door 74
The outlet door 75 is driven by an actuator (not shown) connected to the control device 43 to open and close the opening 72 and the branch 73, respectively. That is, the entrance side door 7
When the door 4 and the exit side door 75 are open, the conditioned air circulates from the air mix chamber 47 to the upstream side of the blower fan 37.

The control unit 43 includes a heat absorbing vehicle interior heat exchanger suction air temperature sensor 58 for detecting the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35, and a heat absorbing vehicle interior heat exchanger 35.
And a ventilator outlet air temperature sensor 60 for detecting the outlet air temperature Tvent of the ventilator outlet 51 connected to the ventilator outlet air temperature sensor 59 for detecting the outlet air temperature Tout of the vehicle. Solar radiation Qsu
n, an outside air temperature sensor 62 for detecting an outside air temperature Tamb, a room temperature sensor 63 for detecting a vehicle interior temperature Troom, and a refrigerant discharge temperature Td on the outlet side of the heat radiation vehicle interior heat exchanger 33. A refrigerant temperature sensor 67 for detecting
A radiating vehicle interior heat exchanger outlet air temperature sensor 68 for detecting the outlet air temperature Tv of the radiating vehicle interior heat exchanger 33 is connected, and various detection information from each sensor is input to the controller 43.

The control device 43 includes an air conditioning setting panel 7.
9 is connected to a room temperature setting device 64, an air outlet mode switch 65, and a blower fan switch 66, and the operation position of a temperature setting lever (not shown) from the room temperature setting device 64 (depending on the set temperature Tptc). It is input to the control device 43. Here, in the present embodiment, as the outlet mode, a vent mode for blowing air mainly to the upper body of the occupant, a foot mode for blowing air mainly to the foot of the occupant, and a bi-level for blowing air to both the upper body and the foot of the occupant. Mode (hereinafter, referred to as B / L mode) can be set,
One of the modes can be selected by operating the outlet mode switch 65. The blower fan switch 66 is for selectively switching the speed (air volume) of the blower fan 37. In this embodiment, the switch 66
By the operation described above, the blower fan speed can be switched in four stages from the first speed to the fourth speed in ascending order of the air volume.

The control unit 43 controls the air mixing door opening Xmix, the input value Wcomp of the compressor 31, the air flow Veva passing through the heat absorbing vehicle interior heat exchanger 35, the target air temperature, based on the detection output of each sensor and the set temperature Tptc. Calculate target cooling and heating conditions such as the blow-out temperature Tof, and set the compressor 31 so that the cooling and heating conditions in the vehicle compartment maintain the target cooling and heating conditions.
The drive control of the blower fan motor 44, the air mix door actuator, the mode door actuator and the like is performed.

In the configuration of the above embodiment, the expansion valve 34
The expansion means, the three-way valve 32 the refrigerant flow switching means 32,
The heat-absorbing heat exchanger interior suction air temperature sensor 58 constitutes a detecting means, and the control device 43 constitutes a determining means and a controlling means.

Next, the detailed procedure of the cooling / heating control by the control device 43 will be described with reference to the flowcharts of FIGS. FIGS. 2 and 3 show the heating process when the blower fan speed is set manually (manually) by operating the blower fan switch 66. FIGS. The heating process when the mode is manually set is shown.

First, the control of FIGS. 2 and 3 will be described. First, various sensor information is input in step S201 of FIG. These pieces of information include a set temperature Tptc set by the room temperature setter 64, a vehicle interior temperature Troom detected by the room temperature sensor 63, an outdoor air temperature Tamb detected by the outdoor air temperature sensor 62, and a heat-exhaust heat-exhaust indoor heat exchanger. The air temperature Tout of the heat absorbing vehicle interior heat exchanger 35 detected by the wind temperature sensor 59 and the suction air temperature of the heat absorbing vehicle interior heat exchanger 35 detected by the heat absorbing vehicle interior heat exchanger suction air temperature sensor 58. Tsuc, the temperature Tv of the blown air from the heat exchanger 33 for heat radiation detected by the heat exchanger 68, the applied voltage Vfan of the blower fan, the amount of solar radiation Qsun detected by the solar radiation sensor 61, and the refrigerant. Refrigerant discharge temperature Td at the outlet side of the heat-dissipating vehicle interior heat exchanger 33 detected by the temperature sensor 67, compressor frequency f, air mix door opening Xmix, intake door opening Xi. nt.

In step S202, step S201
The target outlet temperature Tof is calculated on the basis of the information input in step (1). In steps S203 to S205, the blower fan speed commanded by the operation of the blower fan switch 66 is determined, and according to the determination result, steps S206 to S2 are performed.
At 09, the blower fan speed is fixed between the first speed and the fourth speed.
When the blower fan speed is set, the process proceeds to step S210, and the outlet mode is selected and set from the illustrated characteristics according to the target outlet temperature Tof calculated in step S202. When the target outlet temperature Tof is high, the foot mode is set because of the heating operation, and when the target outlet temperature Tof is low,
Since the cooling operation is performed, the vent mode is set. If the target outlet temperature Tof is an intermediate temperature, the bi-level mode is set.

Next, in step S211 in FIG. 3, it is determined whether or not the suction air temperature Tsuc of the heat absorbing passenger compartment heat exchanger 35 is lower than a preset lower limit T1. For example, during the heating operation, if the outside air temperature is low and the blower fan speed is high, the suction air temperature Tsuc may be lower than the lower limit value T1, and in this case, the refrigeration cycle is in an insufficient capacity state. Even if the occupant raises the set temperature Tptc, it becomes difficult to warm up, and the dehumidifying performance also decreases.

Therefore, when it is determined that Tsuc <T1, the routine proceeds to step S212, in which the intake door 42 is driven in a direction in which the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35 increases. At the time of heating, the temperature of the vehicle interior is usually higher than the temperature of the outside air, so that the intake door 42 is driven so that a large amount of vehicle interior air is guided into the air conditioning duct 39. Next, in step S213, the rotation speed of the compressor 31 is fixed to the compressor frequency set in accordance with the blower fan speed. That is, the higher the blower fan speed, the higher the rotational speed of the compressor. Then, step S22
Proceeding to 4, the opening degree of the air mix door 46 is fixed at full hot (100%), and the process returns to step S201.

Under the control of steps S212 and S213, the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35 is controlled.
Increases, and when the blower fan speed is increased, the rotational speed of the compressor increases, and further, the air flow passing through the heat-dissipating interior heat exchanger 33 is maximized under the control of step S224. Therefore, the heating capacity and the dehumidifying performance can be maximized while maintaining the blower fan air volume set manually.

On the other hand, if it is determined in step S211 that Tsuc ≧ T1, the process proceeds to step S214, in which it is determined whether or not the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35 is higher than the upper limit value T2. When Tsuc> T2, the discharge pressure or discharge temperature of the compressor 31 increases, and the refrigeration cycle tends to be unstable. In particular, when the amount of air passing through the heat exchanger 33 for heat radiation is small, the discharge pressure or discharge temperature of the compressor 31 significantly increases, and in some cases, the compressor 31 must be stopped for cycle protection.

Therefore, if it is determined that Tsuc> T2, the process proceeds to step S215, where the heat absorbing vehicle interior heat exchanger 35
The intake door 42 is driven in a direction in which the suction air temperature Tsuc decreases. For example, at the time of heating, the intake door 42 is driven so that the outside air is more introduced than the vehicle interior air into the air conditioning duct 39. In step S216, the frequency f of the compressor 31 is set in accordance with the blower fan speed and the suction air temperature Tsuc of the heat absorbing passenger compartment heat exchanger 35 from the characteristics shown. According to this characteristic, the compressor frequency f is lower as the blower fan speed is lower, and when the suction air temperature Tsuc is equal to or lower than the predetermined temperature T2, the suction air temperature Tsuc is higher. Thereafter, the process proceeds to step S224 as described above, and the air mix door 4
6 is fixed to full hot (100%), and the process returns to step S201.

Under the control of steps S215 and S216, the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35 is controlled.
And the lower the blower fan speed and the higher the suction air temperature Tsuc, the higher the compressor frequency f
That is, the number of rotations becomes low. Therefore, it is possible to suppress an increase in the discharge pressure or discharge temperature of the compressor 31 while maintaining the blower fan air volume set manually.
The refrigeration cycle can be stabilized. In addition, the compressor rotation speed is not uniquely reduced, but is reduced according to the blower fan speed, so that the compressor rotation speed does not decrease unnecessarily and the decrease in heating capacity is minimized. it can.

When it is determined in step S214 that Tsuc ≦ T2, that is, the refrigeration cycle is stable,
If a satisfactory heating performance is obtained, the process proceeds to step S217 and subsequent steps in order to set the opening of the intake door 42 in accordance with the blown air temperature Tout of the heat absorbing vehicle interior heat exchanger 35. In step S217, the target operating temperature Tfine of the heat absorbing vehicle interior heat exchanger 35 is set. The target operating temperature Tfine corresponds to a target value of the temperature of the air blown out of the heat absorbing vehicle interior heat exchanger 35, and is set so that the heat absorbing vehicle interior heat exchanger 35 is not frozen and sufficient dehumidifying performance is obtained. Set to value.

In step S218, a difference Δθout between the blown air temperature Tout of the heat absorbing vehicle interior heat exchanger 35 and the target operating temperature Tfine set in step S217 is calculated, and in step S219, the calculated difference Δθout is calculated. Compare with a predetermined value Sout. When Δθout <−Sout,
Since it is determined that the outlet air temperature Tout of the heat absorbing vehicle interior heat exchanger 35 is too low and the heat absorbing vehicle interior heat exchanger 35 may be frozen, step S22 is performed to increase Tout.
0, the suction air temperature T of the heat absorbing vehicle interior heat exchanger 35
The intake door 42 is driven by a small opening in the direction in which the suc increases.

On the other hand, if Δθout> Sout, it is determined that the air temperature Tout blown out of the heat-absorbing vehicle interior heat exchanger 35 is too high, and the dehumidifying performance may be degraded.
In order to decrease t, the process proceeds to step S221, and the intake door 42 is driven by a small opening in a direction in which the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35 decreases. Also, -S
In the case of out ≦ Δθout ≦ Sout, Tout falls within the allowable range.
Is maintained at the current opening.

After steps S220, S221, and S222, the process proceeds to step S223, where the number of revolutions of the compressor is set based on the characteristics shown. This characteristic is based on the fact that the heat absorbing vehicle interior heat exchanger 35 does not freeze, and that the heat absorbing vehicle interior heat exchanger 3
The target operating temperature Tfine of 5 is set to be satisfied. According to this characteristic, as shown in the figure, the higher the blower fan speed, the higher the compressor rotation speed. In addition, when the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35 is equal to or higher than the predetermined temperature T1, the higher the Tsuc, the higher the blower fan speed. The compressor speed increases. In the air conditioner of the present embodiment, since the outside heat exchanger 38 is not used during the heating operation, the number of rotations of the compressor is controlled with respect to the suction air load of the heat absorbing heat exchanger 35 without considering the influence of the outside air temperature. Can be set. Thereafter, in step S224, the opening of the air mix door 46 is fixed to full hot as described above, and the process returns to step S201.

Next, the heating process when the outlet mode is manually set by operating the outlet mode switch 65 will be described with reference to FIGS. Steps S301, S in FIG.
In step 302, steps S201 and S20 described in FIG.
As in the case of 2, various types of information are input, and the target outlet temperature Tof is calculated based on the input information. Step S30
In S304, the outlet mode instructed by the outlet mode switch 65 is determined, and the outlet mode is set in steps S305 to S307 according to the determination result. That is, the foot mode is set when the foot mode is commanded, the B / L mode is set when the B / L mode is commanded, and the vent mode is set when the vent mode is commanded.

In step S308, step S302
The blower fan applied voltage Vfan is calculated from the characteristic shown in FIG. According to this characteristic, when the target blowing temperature Tof is high and strong heating is required, and when the target blowing temperature Tof is low and strong cooling is required, the blower fan applied voltage Vfan increases, and the target blowing temperature Tof increases. This is an intermediate value, and when a strong cooling / heating capacity is not required, the blower fan applied voltage Vfan is low.

In step S309, the air outlet mode manually set by operating the air outlet mode switch 65 is set to B
/ L mode is determined. In the case of the B / L mode, the process proceeds to step S320 in FIG. 5, and the target suction air temperature Tein of the heat absorbing vehicle interior heat exchanger 35 is set. In setting the target suction air temperature Tein, the heat radiation capacity of the heat radiation interior heat exchanger 33 and the heat absorption
The characteristics at the time of the heating operation previously obtained by experiments and the like are used in consideration of the freezing conditions, the stability of the cycle with respect to the compressor rotation speed, and the like. Then, the target intake air temperature Tein is set such that a wide range of the interior air temperature is obtained.

In step S321, a difference Δθsuc between the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger 35 and the target suction air temperature Tein set in step S320 is calculated. In step S322, the calculated difference Δθsuc is compared with a predetermined value Ssuc. In the case of Δθsuc <−Ssuc, the intake air temperature Tsuc of the heat absorbing passenger compartment heat exchanger 35 is too low to obtain the blowout temperature required by the occupant, so that the intake air temperature Tsuc increases in step S323. The intake door 42 is driven by a minute opening.

On the other hand, if Δθ suc> S suc, the suction air temperature T suc of the heat absorbing vehicle interior heat exchanger 35 may be too high and the refrigeration cycle may become unstable. The intake door 42 is driven by a small opening in the lowering direction. Also, -Ssuc
If ≦ Δθsuc ≦ Ssuc, Tsuc falls within the allowable range, so that the intake door 42 is maintained at the current opening in step S324.

Next, in step S326, step S3
02, the minimum air mix door opening X at which the refrigeration cycle can operate stably according to the target outlet temperature Tof calculated at 02.
Set mix.min. That is, during the heating operation, the heat-dissipating cabin heat exchanger 33 is cooled by the air-conditioning air cooled by the heat-absorbing car cabin heat exchanger 35. When the wind is less than the predetermined amount, the heat radiation capability of the heat radiation vehicle interior heat exchanger 33 decreases, and the refrigeration cycle becomes unstable. Therefore, it is necessary to always set the air mix door opening larger than the predetermined opening so that the conditioned air guided to the heat-dissipating vehicle interior heat exchanger 33 is equal to or more than the predetermined amount. On the other hand, the B / L mode is a mode in which warm air is blown out from the foot outlet and cool air is blown out from the vent outlet to obtain a head cold foot heat effect.
If the opening of the air mix door is increased more than necessary, the thermal effect of the head cold foot is reduced, and it becomes meaningless to set the B / L mode. Therefore, the minimum air mix door opening Xmix.min is calculated so as to satisfy the above two conditions. According to the characteristics shown in the drawing, the higher the target outlet temperature Tof, the lower the air mix door opening Xmix.min approaches the full hot side, thereby stabilizing the cycle.

In the next steps S327 to S329, the same control as in steps S217 to S219 in FIG. 3 is performed.
That is, the target operating temperature T of the heat absorbing interior heat exchanger 35
Fine is set, and the difference Δθout between the outlet air temperature Tout of the heat absorbing vehicle interior heat exchanger 35 and the target operating temperature Tfine is calculated, and the calculated difference Δθout is compared with the allowable value Sout. Δ
If θout <−Sout, the heat absorbing vehicle interior heat exchanger 35
It is determined that the blown air temperature Tout is too low and the heat absorbing vehicle interior heat exchanger 35 may be frozen.
In step S330, the air mixing door 46 is moved to the full cool side by a very small amount. As a result, the amount of air passing through the heat exchanger 33 for heat dissipation, that is, the amount of heat radiation in the heat exchanger 33 for heat dissipation decreases, and the operating temperature (pressure) of the heat exchanger 35 for heat absorption decreases to the high temperature side. (High pressure side). As a result, the temperature Tout of the blown air from the heat exchanger 35 for heat absorption increases.

On the other hand, if Δθout> Sout, it is determined that the temperature Tout of the air blown from the heat absorbing vehicle interior heat exchanger 35 is too high and the dehumidification performance may be reduced.
Proceeding to step S332 to reduce t, the air mixing door 46 is moved by a small amount to the full hot side. As a result, the amount of air passing through the heat-dissipating cabin heat exchanger 33, that is, the amount of heat dissipated in the heat-dissipating cabin heat exchanger 33, increases, and the operating temperature (pressure) of the heat-absorbing cabin heat exchanger 35 becomes lower. (Low pressure side). As a result, the temperature Tout of the air blown out of the heat exchanger 35 for heat absorption decreases. When −Sout ≦ Δθout ≦ Sout, Tout falls within the allowable range, and therefore, the process goes to step S3.
At 31, the air mix door 46 is maintained at the current opening.

In step S333, it is determined whether or not the current air mix door opening Xdsc is larger than the minimum air mix door opening Xmin calculated in step S326, that is, the air mix door 46 is on the full hot side of Xmix.min. Is determined. Xmix <Xmix.mi
n, that is, when it is determined that the air mix door 46 is at a position on the full cool side of Xmix.min, step S3
At 34, the air mixing door 46 is adjusted so that the air mixing door opening Xmix becomes the minimum air mixing door opening Xmix.min.
, And then the process proceeds to step S335 in FIG. On the other hand, if Xmix ≧ Xmix.min, the process proceeds directly to step S335.
Proceed to.

From the above, the air mix door opening Xmix
Is controlled between the minimum air mix door opening Xmix.min and full hot. Therefore, it is possible to prevent the amount of air passing through the heat exchanger 33 for heat radiation from undesirably decreasing while maintaining the head-to-foot heat effect in the B / L mode, and suppress an increase in the temperature of the refrigerant discharged from the compressor 31 and the pressure of the discharged refrigerant. As a result, the refrigeration cycle can be stabilized.

In step S335, the temperature of the blown air Tout of the heat exchanger 35 for heat absorption, the temperature of the blown air Tv of the heat exchanger 33 for heat radiation, and the air mix door opening Xm
Based on ix, the vehicle interior air temperature Tdis when cold air from the vent air outlet 51 and warm air from the foot air outlet 52 are mixed is estimated.

In step S336, a difference Δθdis between the above-described vehicle interior air temperature Tdis and the target air temperature Tof is calculated, and in step S337, the calculated difference Δθdis is compared with a predetermined value Sdis. When Δθdis <−Sdis,
Since the vehicle interior air temperature Tdis is lower than the target air temperature Tof by a predetermined value or more, step S33 is performed to increase Tdis.
Proceeding to 8, the frequency f of the compressor 31 is increased by a small amount. On the other hand, in the case of Δθdis> Sdis, the air temperature Tdis in the vehicle compartment is higher than the target air temperature Tof by a predetermined value or more. Therefore, the process proceeds to step S340 to reduce Tdis, and the frequency f of the compressor 31 is reduced by a small amount. . When −Sdis ≦ Δθdis ≦ Sdis, Td
Since is is within the allowable range, the compressor frequency is maintained at the current frequency in step S339. afterwards,
The process returns to step S301.

On the other hand, if it is determined in step S309 in FIG. 4 that a mode other than the B / L mode has been set, the heating operation is performed with the air mix door opening Xdsc set to full hot. Steps S211 to S211 in FIG.
The same processing as in S224 is performed.

In FIGS. 2 to 6, the case where one of the blower fan speed and the outlet mode is manually set has been described. However, the blower fan speed is set manually during the heating operation, and the B / L mode is set. Is manually set, the control in the B / L mode described with reference to FIGS. 5 and 6 is preferentially performed. To realize this, for example, step S20 in FIG. 2 is inserted between steps S302 and S303 in FIG.
What is necessary is just to insert the process of 3-S209. According to this,
Satisfactory heating capacity and stabilization of the refrigeration cycle can be achieved while maintaining the head and foot heat effect.

In the above, steps S211, S21
As shown in FIG. 4, it is determined whether or not the refrigeration cycle is in an unstable state or in a state of insufficient capacity based on the suction air temperature Tsuc of the heat absorbing vehicle interior heat exchanger.
Instead of the above, the intake air load of the heat absorbing interior heat exchanger, the blowing air load of the heat absorbing interior heat exchanger, the suction air load of the heat radiating interior heat exchanger 33, and the blowing of the heat radiating interior heat exchanger 33. The above-described state determination may be performed based on an air load, an operation state (for example, a heat release amount) of the heat-exchange vehicle interior heat exchanger 33, and the like. Here, the air load is a concept including the air temperature, the air pressure, or the air amount.

The minimum air mix door opening is determined from the target outlet temperature. However, the temperature of the air blown out of the heat exchanger 33 for the heat radiation, the refrigerant temperature or the refrigerant pressure in the heat exchanger 33 for the heat radiation, are determined. Alternatively, the minimum air mix door opening may be calculated from the refrigerant temperature and the refrigerant pressure discharged from the compressor 31. Further, the temperature Tdis of the vehicle compartment at the time of the B / L mode is changed by the heat exchanger 3 for heat absorption.
5 and the radiating vehicle interior heat exchanger 33
Is calculated from the outlet air temperature Tv and the air mix door opening Xmix, but a temperature sensor may be provided at the outlet to directly measure the outlet air temperature in the vehicle compartment.

[0054]

According to the first aspect of the invention, when the air flow rate of the air-conditioning air generating means is set according to the manual operation during the heating operation, the number of rotations of the compressor is set according to the air flow rate, At this time, if it is determined that the refrigeration cycle is in an unstable state, the suction air load of the heat absorbing interior heat exchanger is reduced, so that the refrigeration cycle is quickly maintained while maintaining the air flow according to the manual operation. The cycle can be returned to a stable state. In particular, as in the invention of claim 2,
If the rotational speed of the compressor is reduced as the degree of the unstable state of the refrigeration cycle is increased, the refrigeration cycle is further stabilized. According to the invention of claim 3, when the air flow rate of the conditioned air generation means is set according to the manual operation during the heating operation, the rotation speed of the compressor is set according to the air flow rate, and at this time, the refrigeration cycle is started. If it is determined that the refrigeration cycle is in a state of insufficient capacity, the intake air load of the heat absorbing vehicle interior heat exchanger is increased, so that the capacity of the refrigeration cycle is quickly reduced while maintaining the air flow according to the manual operation. Can be resolved. In particular, if the compressor rotation speed is maintained at a predetermined value or more irrespective of the degree of insufficient capacity of the refrigeration cycle, a satisfactory heating capacity can be reliably obtained. According to the invention of claim 5, when the bi-level mode is set by a manual operation during the heating operation, the control is performed such that the suction air load of the heat absorbing vehicle interior heat exchanger approaches a preset target value. The air mix door is driven and controlled between the maximum opening and the minimum air mixing door opening calculated based on the target outlet temperature, etc., so that the heat dissipating vehicle can be maintained while maintaining the desired vehicle interior outlet temperature. The amount of air passing through the indoor heat exchanger can be appropriately controlled. Therefore, undesired rises in the compressor discharge refrigerant pressure and the discharge refrigerant temperature are suppressed, and the refrigeration cycle can be stabilized. According to the invention of claim 6, when the air blowing amount of the conditioned air generating means is set according to the manual operation and the bi-level mode is set by the manual operation, the control at the time of the manual setting of the bi-level mode is performed. Since the priority is given, the refrigeration cycle can be maintained in a stable state or a state in which sufficient heating performance can be obtained while maintaining the air flow according to the manual operation when the bi-level mode is set.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing a heating control procedure when a blower fan air volume is manually set.

FIG. 3 is a flowchart following FIG. 2;

FIG. 4 is a flowchart illustrating a procedure of heating control when an outlet is manually set.

FIG. 5 is a flowchart following FIG. 4;

FIG. 6 is a flowchart following FIG. 5;

FIG. 7 is a configuration diagram showing a conventional heat pump type air conditioner for a vehicle.

[Explanation of symbols]

 REFERENCE SIGNS LIST 31 compressor 32 three-way valve 33 heat-exchanging vehicle interior heat exchanger 34 expansion valve 35 heat-absorbing vehicle interior heat exchanger 37 blower fan 38 exterior vehicle heat exchanger 43 controller 44 blower fan motor 46 air mix door 51 ventilator (vent) blowing Outlet 52 Foot outlet 53 Defroster outlet 58 Heat absorption vehicle interior heat exchanger suction air temperature sensor 59 Heat absorption vehicle interior heat exchanger blown air temperature sensor 61 Solar radiation sensor 62 Outside air temperature sensor 63 Room temperature sensor 65 Air outlet mode switch 66 Blower Fan switch

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-319070 (JP, A) JP-A-5-319077 (JP, A) JP-A-5-294138 (JP, A) JP-A-5-294138 40235 (JP, A) Japanese Utility Model Hei 6-10007 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60H 1/32 615

Claims (6)

(57) [Claims] 1. An air-conditioning air generating means for generating air-conditioning air to be blown into a vehicle interior, a compressor for pressure-feeding a refrigerant, and a vehicle external heat connected to a refrigerant discharge side of the compressor and radiating heat of the refrigerant to the outside air. An exchanger, connected to a refrigerant discharge side of the compressor, and a heat-dissipating vehicle interior heat exchanger that radiates heat of the refrigerant to the conditioned air to generate warm air; and a refrigerant outflow side of the heat-dissipating vehicle interior heat exchanger. Expansion means for adiabatically expanding the refrigerant, connected to a refrigerant outflow side of the expansion means and a refrigerant inflow side of the compressor, and transferring the heat of the conditioned air to the outside heat exchanger and the heat radiation interior A heat-absorbing vehicle interior heat exchanger that absorbs the refrigerant adiabatically expanded by the expansion means through at least one of the heat exchangers to generate cool air, and a refrigerant that guides refrigerant discharged from the compressor to the vehicle exterior heat exchanger. Pipe and Provided at a branch point of a refrigerant pipe leading to the serial heat-radiating inner heat exchanger, during the cooling operation leads to the discharge refrigerant of said compressor to at least the vehicle exterior heat exchanger,
In the heating operation, the heat pump type air conditioner for a vehicle that includes a refrigerant flow path switching means for guiding the refrigerant discharged from the compressor to the heat-radiating inner heat exchanger to bypass the car exterior heat exchanger, for the endothermic Inlet air load of heat exchanger in vehicle interior
Internal heat exchanger blow-out air load and heat dissipation heat exchanger
Detecting means for detecting at least one of the blown air loads as a physical quantity indicating the state of the refrigeration cycle, and a detection output of the detecting means being higher than a preset upper limit value.
Determination means for determining whether or not the air flow rate is high, and the air flow rate of the air-conditioning air generation means is manually operated during the heating operation.
When set according to the air volume of the air conditioning
The number of rotations of the compressor
When the detection output of the detection means is a preset upper limit value
If it is determined that the temperature is higher than
A heat pump type cooling / heating device for a vehicle, comprising: a control unit for reducing an intake air load of the internal heat exchanger . 2. The air conditioner according to claim 1, wherein said control means is configured to control said air conditioning during a heating operation.
The air volume of the wind generator is set according to the manual operation, and
It is determined that the detection output of the detection means is higher than the upper limit value
If the detection output of the detection means is higher,
Reducing the compressor rotation speed.
A vehicle heat pump air conditioner according to claim 1 . 3. An air-conditioning air to be blown into a vehicle interior.
Conditioned air generating means, a compressor for pressure-feeding the refrigerant, and connected to a refrigerant discharge side of the compressor to generate heat of the refrigerant.
An external heat exchanger that radiates heat to the outside air, and is connected to a refrigerant discharge side of the compressor, and transfers heat of the refrigerant.
A heat-radiating vehicle interior heat exchanger that radiates heat to the conditioned air to produce warm air
When connected to a refrigerant outflow side of the heat-radiating inner heat exchanger, cold
Expansion means for adiabatically expanding the medium; a refrigerant outlet side of the expansion means; and a refrigerant flow of the compressor.
And the heat from the air conditioning
Heat exchanger and / or heat exchanger
Heat is absorbed by the refrigerant adiabatically expanded by the expansion means through one side.
Heat exchanger for heat absorption, which creates cool air, and guides refrigerant discharged from the compressor to the heat exchanger outside the vehicle.
Refrigerant line and refrigerant line leading to the heat-dissipating interior heat exchanger
At the junction of the
Guiding the refrigerant discharged from the heat exchanger to at least the exterior heat exchanger,
During the heating operation, the refrigerant discharged from the compressor is
Bypassing the outdoor heat exchanger to the heat-dissipating interior heat exchanger
Vehicle heat pump type equipped with a refrigerant passage switching means for guiding
In the cooling / heating device, the suction air load of the heat exchanger for heat absorption and the heat absorption
Internal heat exchanger blow-out air load and heat dissipation heat exchanger
To detect at least one of the
Output means and the detection result of the detection means is smaller than a preset lower limit value.
Determining means for determining whether or not the air flow rate of the conditioned air generating means is manually operated during the heating operation.
When set according to the air volume of the air conditioning
The number of rotations of the compressor
When the detection output of the detection means is a preset lower limit value
If it is determined that the temperature is lower than
Control means for increasing the suction air load of the internal heat exchanger.
A heat pump type air conditioner for a vehicle, comprising: 4. The air conditioner according to claim 1, wherein said control means controls said air conditioning during a heating operation.
The air volume of the wind generator is set according to the manual operation, and
It is determined that the detection output of the detection means is lower than the lower limit value
If it has been detected, regardless of the detection output of the detection means,
The feature is to keep the compressor speed above a predetermined value.
The vehicle heat pump air conditioner according to claim 3 , wherein 5. The amount of air passing through the heat-exchange vehicle interior heat exchanger.
The air mix door, which regulates the air temperature, the target air temperature,
From the load and the air load blown out of the heat exchanger inside the vehicle.
Of the cabin outlet temperature calculated,
Minimum air based on at least one of the operating conditions
Calculating means for calculating the mixed door opening degree; wherein the control means controls the vent outlet and the fan during the heating operation.
Bi-level outlet that blows conditioned air into the cabin from both outlets
If the mode is set manually,
Preset suction air load of heat exchanger for heat absorption
The intake air load is controlled so as to approach the target value.
Then, the air mixing door is connected to the heat exchange
The maximum opening degree at which the amount of air passing through the
Drive control between the minimum air mix door opening
The heat pump type cooling and heating apparatus for a vehicle according to claim 1, wherein: 6. An air-conditioning air to be blown into a vehicle interior.
Air-conditioning air generating means, a compressor for pumping refrigerant, and connected to a refrigerant discharge side of the compressor to generate heat of the refrigerant.
An external heat exchanger that radiates heat to the outside air, and is connected to a refrigerant discharge side of the compressor, and transfers heat of the refrigerant.
A heat-radiating vehicle interior heat exchanger that radiates heat to the conditioned air to produce warm air
When connected to a refrigerant outflow side of the heat-radiating inner heat exchanger, cold
Expansion means for adiabatically expanding the medium; a refrigerant outlet side of the expansion means; and a refrigerant flow of the compressor.
And the heat from the air conditioning
Heat exchanger and / or heat exchanger
Heat is absorbed by the refrigerant adiabatically expanded by the expansion means through one side.
Heat exchanger for heat absorption, which creates cool air, and guides refrigerant discharged from the compressor to the heat exchanger outside the vehicle.
Refrigerant line and refrigerant line leading to the heat-dissipating interior heat exchanger
At the junction of the
Guiding the refrigerant discharged from the heat exchanger to at least the exterior heat exchanger,
During the heating operation, the refrigerant discharged from the compressor is
Bypassing the outdoor heat exchanger to the heat-dissipating interior heat exchanger
Refrigerant flow switching means for guiding, and air for adjusting the amount of air passing through the heat exchanger for heat radiation inside the vehicle
Heat pump type air conditioning system for vehicles with mixed door
The target air temperature, the air flow from the heat exchanger
From the load and the air load blown out of the heat exchanger inside the vehicle.
Of the cabin outlet temperature calculated,
Minimum air based on at least one of the operating conditions
Calculating means for calculating the mixed door opening; said compressor, heat exchanger, expansion means, and refrigerant flow path;
Physics indicating the state of the refrigeration cycle composed of switching means
Detecting means for detecting the amount, and the refrigeration cycle is unstable based on the detected physical quantity
For judging whether the machine is in a state or a lack of capacity
And the air flow rate of the air-conditioning air generating means is set according to a manual operation.
And both vent and foot outlets
Mode that blows air conditioning air into the cabin from the
During the heating operation that is not set by the operation,
The refrigeration cycle is unstable or insufficient due to the stage
If it is determined that the endothermic
Air load of the heat exchanger in the passenger compartment,
Of the number of revolutions and the amount of air passing through the heat exchanger
At least one of them is controlled and the bi-level mode is controlled.
When the password is set manually,
Regardless of whether the air volume is set manually or not,
Preset target value for the intake air load of the vehicle interior heat exchanger
Controls the intake write air load to approach to, the
Pass the air mix door through the heat exchanger
The maximum opening that maximizes the amount of air and the minimum
Control means for controlling the drive with respect to the opening of the mix door.
A heat pump type air conditioner for a vehicle, comprising: