JPH07285318A - Heat pump type cooling/heating device for vehicle - Google Patents

Abstract

PURPOSE:To give heating feeling into a car room in a short time at the time of heating warm-up. CONSTITUTION:An intake door 42 is opened or closed with heat load signals of temperature on the freeze prevention of a heat exchanger 35 in a car room for heat absorption or the defogging of glass. When the aperture of the intake door 42 becomes larger than the preset aperture, the quantity of the conditioned air blown out from the blowout ports other than foot blowout ports is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type air conditioner for a vehicle which air-conditions a passenger compartment.

[0002]

2. Description of the Related Art A refrigerant flow is reversed by a four-way valve during heating operation and during cooling operation, and an exterior heat exchanger (hereinafter referred to as an outdoor heat exchanger or an outdoor unit) is used as a heat absorber during heating operation. In addition, the vehicle interior heat exchanger (hereinafter referred to as indoor heat exchanger or indoor unit) is used as a radiator, and the outdoor unit is used as a radiator and the indoor unit is used as a heat absorber during cooling operation. A heat pump type air conditioner for a vehicle is known (for example, JP-A-2-
(See JP-A-290475). FIG. 7 shows the configuration of this type of vehicle heat pump type air conditioner.

During the heating operation, the four-way valve 2 is switched as shown by the solid line, and the refrigerant is compressor 1 → four-way valve 2 → first indoor heat exchanger 3 → heating heat exchanger 4 → second indoor heat exchanger 5 → It circulates in the path of expansion valve 6-> outdoor heat exchanger 7-> four-way valve 2-> receiver 8-> compressor 1. At this time, the heat of the high-temperature refrigerant discharged from the compressor 1 in the first indoor unit 3 is radiated to the air introduced by the blower fan 9 to generate warm air. Further, in the heat exchanger 4 for heating, the refrigerant whose temperature has dropped due to heat exchange in the first indoor unit 3 is heated by utilizing the waste heat from the engine 10 and sent to the second indoor unit 5. In the second indoor unit 5, the heat of the refrigerant heated by the heating heat exchanger 4 is transferred to the blower fan 11
Heat is dissipated to the air introduced by and hot air is created. On the other hand, in the outdoor unit 7, the refrigerant whose temperature has dropped due to heat exchange in the second indoor unit 5 absorbs the heat of the outside air introduced by the fan 12. That is, during the heating operation, the outdoor unit 7 is used as a heat absorber and the indoor units 3, 5 are used as radiators to generate warm air.

During cooling operation, the four-way valve 2 is switched as shown by the dotted line, and the refrigerant is compressed from the compressor 1 to the outdoor unit 7 to
The expansion valve 6 → the second indoor unit 5 → the first indoor unit 3 → the four-way valve 2 → the receiver 8 → the compressor 1 circulates in the flow path. At this time, in the outdoor unit 7, the heat of the high-temperature refrigerant discharged from the compressor 1 is radiated to the outside air, and in the first and second indoor units 3 and 5, the refrigerant whose heat is radiated by the outdoor unit 7 and whose temperature is lowered is blower fan. The heat of the air introduced by 9 and 11 is absorbed. That is, during the cooling operation, the outdoor unit 7 is used as a radiator and the indoor units 3 and 5 are used as heat absorbers to produce cold air.

Further, like a vehicle air conditioner disclosed in Japanese Patent Laid-Open No. 56-63512, a plurality of air outlets such as a vent air outlet and a foot air outlet are provided, and the temperature of the air blown from each air outlet and the outside air temperature. There is also known a vehicle heat pump type air conditioner that automatically switches the outlets based on the temperature and the air mix door opening degree to improve the operability and the feeling of air conditioning.

[0006]

However, in the heat pump type air conditioner for a vehicle described above, the flow of the refrigerant is reversed by the four-way valve 2 during the heating operation and the cooling operation, and the outdoor unit 7 absorbs heat during the heating operation. The indoor units 3 and 5 are used as radiators to generate warm air, and the outdoor unit 7 is used as a radiator during cooling operation, and the indoor units 3 and 5 are used as heat absorbers to generate cold air. There is. Therefore, if heating operation is performed under climatic conditions such as low outdoor temperature, rain or snow, the amount of heat absorbed by the outdoor unit 7 decreases, and assuming that the work of the compressor 1 is constant, The heat radiation amount in the indoor units 3, 5 that radiate the total heat amount of the heat absorption amount from 7 and the work amount of the compressor 1 is reduced, and the heating capacity is reduced. Moreover, under such a climatic condition, a frosting phenomenon is likely to occur, and the number of defrosting operations increases, which may make the heating operation unstable.

Further, since the length of the refrigerant flow path does not change between the cooling operation and the heating operation, it is not necessary to adjust the amount of working refrigerant according to the operation mode, but since the direction in which the refrigerant flows changes, the outdoor unit It is necessary that the refrigerant pipes on both the 7-side and the indoor units 3 and 5 can withstand high temperatures and high pressures. Further, since the waste heat from the engine 10 is absorbed during the heating operation to generate warm air for heating the passenger compartment, it is not suitable for a vehicle having no large heat source such as a solar car or an electric vehicle.

In order to solve such a problem, the applicant of the present invention has proposed a vehicle heat pump type cooling / heating apparatus capable of dehumidifying and heating by providing a heat absorber and a radiator inside the vehicle (for example, Japanese Patent Application (See No. 5-17575). However, in this heat pump type air conditioner for a vehicle, sufficient heating capacity cannot be obtained unless heating operation is performed while the amount of outside air introduced is kept to a necessary minimum. However, when the heating operation of the air blown from the feet is continued, the amount of outside air introduced is small, and the air flow in the passenger compartment flowing from the front seats to the rear seats is poor. Therefore, if the blowing mode is not limited to the foot blowing mode but is intermittently switched to the bi-level mode or the defrost mode, the air mix door opening is set to 100 to stabilize the operation of the refrigeration cycle.
% (On the heating side), there is a problem that the hot air blows on the passenger's face and causes discomfort.

It is an object of the present invention to provide a heat pump type air conditioner for a vehicle that can provide a feeling of heating the interior of a vehicle in a short time during warming up of the heating.

[0010]

The present invention will be described with reference to FIGS. 1 and 2 showing an embodiment. In the invention of claim 1, a compressor 31 for adding a work amount to a refrigerant, and a compressor 31 Heat exchanger 38 for radiating the heat of the discharged refrigerant to the outside air, and heat for radiating the vehicle interior for radiating the heat of the refrigerant discharged from the compressor 31 to the air blown by the blowing means 37 to generate warm air Exchanger 33
An expansion means 34 connected to the refrigerant outflow side of the heat dissipation vehicle interior heat exchanger 33; a refrigerant outflow side of the expansion means 34 and a refrigerant intake side of the compressor 31; A heat-absorbing vehicle interior heat exchanger 35 that absorbs the heat of the air into the refrigerant to form cold air, and a refrigerant that is provided on the refrigerant discharge side of the compressor 31 and flows the refrigerant discharged from the compressor 31 to the vehicle exterior heat exchanger 38. A refrigerant flow path switching means 32 for switching whether to flow to the heat radiation vehicle interior heat exchanger 33; an intake door 42 for adjusting the ratio of the conditioned air introduced from outside the vehicle interior to the conditioned air introduced from the vehicle interior;
Multiple air-conditioning air outlets 5 including foot outlets 52
1 to 53, which is applied to a heat pump type air conditioner for a vehicle, which has a temperature related to freezing prevention of the heat absorbing vehicle interior heat exchanger 35, a temperature related to defrosting of glass, a target blowing air temperature, and a heat radiating vehicle interior heat exchanger. An intake door drive control means 43 for driving and controlling the opening degree of the intake door 42 based on at least one of the outlet air temperature of 33, the inlet air temperature of the heat-absorbing passenger compartment heat exchanger 35, and the passenger compartment temperature, This achieves the above object. In the vehicle heat pump type air conditioner according to claim 2, the intake door drive control means 43 causes the intake air temperature of the heat absorbing vehicle interior heat exchanger 35 to reach a preset temperature T1 and then the heat absorbing vehicle interior heat exchange. The intake door 42 is driven and controlled so that the outlet air temperature of the container 35 reaches a preset temperature T2. In the vehicle heat pump type cooling and heating apparatus according to claim 3, the intake door drive control means 43 freezes the heat absorbing vehicle interior heat exchanger 35 to the set temperature T2 when the heat absorbing vehicle interior heat exchanger 35 may freeze. A temperature related to prevention is set, and when there is no fear of freezing, a temperature related to antifogging of glass is set to the set temperature T2. In the heat pump type air conditioner for a vehicle according to claim 4, after the opening degree of the intake door 42 becomes larger than the preset opening degree at the time of warming up the heating, the outlets 51, 53 other than the foot outlet 52.
The heating warm-up control means 43 is provided to increase the amount of conditioned air blown out of the room.

[0011]

In the heat pump type air conditioner for a vehicle according to the first aspect of the present invention, the temperature related to freeze prevention of the heat absorbing passenger compartment heat exchanger 35, the temperature related to defrosting of glass, the target blown air temperature,
The opening degree of the intake door 42 is drive-controlled based on at least one of the outlet air temperature of the heat radiating passenger compartment heat exchanger 33, the inlet air temperature of the heat absorbing passenger compartment heat exchanger 35, and the passenger compartment temperature. As a result, the opening of the intake door that started operating in the inside air circulation state in which conditioned air is introduced from the passenger compartment gradually increases as the operation of the refrigeration cycle approaches a stable state, and the air flow in the passenger compartment from the front seats to the rear seats increases. Is increased, and the feeling of heating in the vehicle compartment can be enhanced in a short time. In the heat pump type air conditioner for a vehicle according to claim 2, after the inlet air temperature of the heat absorbing vehicle interior heat exchanger 35 reaches a preset temperature T1, the outlet air temperature of the heat absorbing vehicle interior heat exchanger 35 is changed in advance. The intake door 42 is drive-controlled so as to reach the set temperature T2. That is, it can be determined that the operation of the passenger compartment and the refrigeration cycle has approached a stable state because the inlet air temperature of the heat exchanger interior heat exchanger 35 has reached the set temperature T1, and from that state, it is possible to determine. The opening degree of the intake door 42 is increased so that the outlet air temperature of the heat exchanger 35 reaches the set temperature T2, and the amount of introduced outside air is increased. In the vehicle heat pump type cooling and heating apparatus according to claim 3, when there is a possibility that the heat-absorbing vehicle interior heat exchanger 35 freezes, a temperature related to freeze prevention of the heat-absorbing vehicle interior heat exchanger 35 is set to the set temperature T2, and the temperature is frozen. If there is no fear of that, the temperature related to the anti-fog of glass is set to the set temperature T2. As a result, it is possible to effectively prevent freezing of the heat-absorbing passenger compartment heat exchanger 35 and defrosting of the glass when warming up the heating. In the vehicle heat pump type cooling and heating apparatus according to claim 4, the intake door 42 is provided during warm-up of heating.
After the opening of is larger than the preset opening,
The amount of the conditioned air blown from the outlets 51 and 53 other than the foot outlet 52 is increased. As a result, the warm air can be effectively blown out in a state where the operation of the vehicle interior and the refrigeration cycle are stable, and the feeling of heating in the vehicle interior can be enhanced.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiments are used to make the present invention easy to understand. It is not limited to.

[0013]

1 and 2 show the structure of an embodiment. The refrigeration cycle of this embodiment includes a compressor 31, a three-way valve 32, an outdoor heat exchanger (outdoor unit) 38, a check valve 70, a heat radiation indoor heat exchanger (radiator) 33, a liquid tank 36, an expansion valve 34, and An indoor heat exchanger for heat absorption (heat absorber) 35 is provided. The compressor 31 is an electric or hydraulic drive type compressor whose work can be controlled by a signal from the outside, and is provided outside the vehicle, for example, in the engine room. A three-way valve 32, which is a refrigerant flow path switching means, is provided on the refrigerant discharge side of the compressor 31, and the refrigerant discharged from the compressor 31 is guided to the outdoor unit 38 by this three-way valve 32.
Alternatively, it is switched whether to bypass the outdoor unit 38 and lead to the radiator 33.

In the following, the former refrigerant flow path through the outdoor unit 38 in the refrigeration cycle, that is, the compressor 31, the three-way valve 32, the outdoor unit 38, the check valve 70, and the radiator 3 will be described.
3-> liquid tank 36-> expansion valve 34-> heat absorber 35-> the flow path of the compressor 31 is called the first flow path, and the latter refrigerant flow path that bypasses the outdoor unit 38 in the refrigeration cycle, that is, the compressor 31-> three-way valve 32-> The flow path of the radiator 33 → the liquid tank 36 → the expansion valve 34 → the heat absorber 35 → the compressor 31 is called a second flow path. In this embodiment, the three-way valve 32 is controlled to switch to the first flow path during normal cooling operation, and to switch to the second flow path during normal heating operation.

The outdoor unit 38 radiates the heat of the high temperature refrigerant discharged from the compressor 31 to the outside air. Cooling fan 3
0 is for blowing air to the outdoor unit 38 to increase the amount of heat radiation, and the rotation speed is controlled by the control device 43 described later. The check valve 70 blocks the reverse flow of the refrigerant so that the refrigerant does not flow into the outdoor unit 38 during the heating operation by the second flow path. Further, the radiator 33 and the heat absorber 35 are provided in an air conditioning duct 39 arranged in the front part of the vehicle compartment such as the back side of the instrument panel, and the heat of the high-temperature refrigerant discharged from the compressor 31 by the radiator 33 is provided. Radiates heat to the air blown by the blower fan 37, and the heat absorber 35 causes the blower fan 37
The heat of the air blown by is absorbed by the refrigerant. further,
A liquid tank 36 is provided between the radiator 33 and the heat absorber 35.
An expansion valve 34 is installed, and a liquid tank 36 separates the gas and liquid of the refrigerant, and the expansion valve 34 adiabatically expands and liquefies the refrigerant that is compressed and liquefied by the compressor 31 to be vaporized. Therefore, the upstream side of the expansion valve 34, that is, the radiator 33 side is the high pressure side in this refrigeration cycle, and the downstream side of the expansion valve 34, that is, the heat absorber 35 side is the low pressure side.

On the upstream side of the duct 39, there are provided an inside air introducing port 40 for introducing the air in the passenger compartment and an outside air introducing port 41 for introducing the outside air in response to the traveling wind pressure. An intake door 42 driven by the illustrated actuator is provided, and the inside air inlet 40 and the outside air inlet 4 are provided.
Open and close 1 with any ratio. The blower fan 37 installed upstream of the duct 39 is driven by a blower motor 44, introduces air from the inside air inlet 40 and the outside air inlet 41 according to the opening / closing ratio of the intake door 42, and is arranged downstream of the duct 39. Heat absorber 35 and radiator 3
Blow to 3.

An air mix door 46 is provided on the upstream side of the radiator 33. The air mix door 46 is opened and closed by an actuator (not shown) to adjust the ratio of the air passing through the radiator 33 and the air bypassing the radiator 33. The air absorbed by the heat absorber 35 and cooled is partly passed through the radiator 33 to be warmed according to the opening degree of the air mix door 46, and the rest bypasses the radiator 33 and is blown out as cold air. It That is, the ratio of cold air to warm air is adjusted according to the opening degree of the air mix door 46. The opening Xdsc of the air mix door 46 is the air mix door 46.
Is 0% (fully closed, Xdsc =
0), and at this time, the air volume distribution between cold air and warm air is 10
It will be 0%. On the other hand, the opening Xdsc when the air mix door 46 is at the position shown is 100% (fully open, Xdsc
= 100), and at this time, the air volume distribution between the cold air and the warm air is 100%.

An air mix chamber 47 is provided downstream of the air mix door 46 of the duct 39, where cold air and warm air are mixed to produce temperature-controlled conditioned air. Downstream of the air mix chamber 47, a ventilator outlet 51 that blows conditioned air toward the upper body of the occupant,
A foot outlet 52 that blows out the conditioned air toward the feet of the occupant and a defroster outlet 53 that blows out the conditioned air toward the windshield are installed, and the ventilator doors 55 and 53 are provided at the respective outlets 51 to 53.
A foot door 56 and a defroster door 57, and an actuator (not shown) that drives each door are provided. The ventilator outlet 51 has center vent outlets 51b and 51c at the center of the vehicle instrument.
Side vent outlets 51 on both sides of the instrument
a and 51d are provided.

Further, the duct 39 is provided with a recirculation duct 71 for recirculating air from the air mix chamber 47 to the inside air inlet 40. Air mix chamber 47
A recirculation door 74 is provided at the side air intake port 72, and the air intake port 72 is opened and closed by being driven by an actuator (not shown). That is, the amount of recirculated air is adjusted according to the opening degree of the recirculation door 74. Further, a switching door 75 is provided on the side of the inside air introduction port 40, and is driven by an actuator (not shown) to adjust the ratio between the recirculated air introduced into the air conditioning duct 39 and the inside air.

Various physical quantities used in this specification will now be defined. Tsuc; inlet air temperature of heat absorber 35 (detected by heat absorber inlet temperature sensor 58) Tout; outlet air temperature of heat absorber 35 (detected by heat absorber outlet temperature sensor 59) Tvsc; outlet air temperature of radiator 33 ( Temperature detected by radiator outlet temperature sensor 60) Tv; Temperature of blown air from ventilator outlet 51 Tamb; Air temperature outside the vehicle compartment (outside air temperature) (Detected by outside air temperature sensor 62) Tic; Air temperature inside vehicle (inside air temperature) ) (Detected by the room temperature sensor 63) Tptc; Set value of vehicle interior temperature (hereinafter referred to as set room temperature) (set by the room temperature setting device 64) Tof; Target blown air temperature Td of cooling and heating device; Refrigerant discharged from the compressor 31 Temperature (detected by a refrigerant heat detection sensor (not shown)) Qsun; (Detected by the sensor 61) Xdsc; Opening degree of air mix door 46 Xint; Opening degree of intake door 42 Hz; Frequency of compressor 31 (value proportional to rotation speed) Vfan; Voltage applied to blower motor 44

The control device 43 includes a microcomputer, a memory, an A / D converter, an actuator drive circuit,
The sensor 58 to 60, the room temperature setting device 64, the blowout port mode switch 65 for switching the blowout port, the blower fan switch 66, the blower motor 44, the cooling fan 30, which includes an interface circuit and the like.
Each door actuator, compressor 31, three-way valve 3
2 etc. are connected. The control device 43 executes a control program described later to control the air conditioning in the vehicle compartment. That is,
Tsuc, Tout, Tv from sensor and setting device
Xdsc, Wcomp, To based on thermal environment information such as sc, Tv, Qsun, Tamb, Tic, Tptc
The target cooling / heating conditions such as f are calculated, and the compressor 31, the blower motor 44, the cooling fan 30, the actuators of the respective doors, etc. are controlled so that the vehicle interior has the target cooling / heating conditions.

3 to 6 are flowcharts showing the control of the controller 43 during the heating operation. The operation of the embodiment will be described with reference to these flowcharts. When the heating switch (not shown) of the air conditioning unit is turned on, or when the heating operation mode is selected during operation in the automatic air conditioning mode,
The control during the heating operation shown in FIGS. In step S1, the room temperature Tptc, the inside air temperature Tic, the outside air temperature Tamb, the heat absorber outlet air temperature Tout, the heat absorber inlet air temperature Tsuc, which are set by the above-described sensor and operation member,
Blow-off air temperature Tv, blower voltage Vfan, insolation Qs
un, compressor discharge refrigerant temperature Td, compressor frequency Hz, air mix door opening Xdsc, intake door opening Xint, etc. are detected. In the following step S2, the target blowing air temperature Tof is calculated based on the detected sensor value, and the process proceeds to step S3. Step S
3, the inside air temperature Tic and the target blowing air temperature Tof
Determine whether the passenger compartment is warm based on
If the warm-up control is not performed because the passenger compartment is warm, the process proceeds to step S4. If the warm-up control is performed because the passenger compartment is not warm, the process proceeds to step S5. In step S4, normal control during stable heating is performed, and the process returns to step S1.

If the passenger compartment is not warm, step S5
After that, heating warm-up control is performed. Step S5
Then, the operating frequency of the compressor 31 is set to the frequency at the time of warming up the heating. Since it is necessary to quickly warm the interior of the vehicle when warming up the heating, the compressor 31 is normally operated at the maximum rotation speed. Step S6
Then, set the opening Xdsc of the air mix door 46 to F / H.
The blower voltage Vf is fixed according to the discharge refrigerant temperature Td of the compressor 31 while fixing it at (100%).
Set an. When the compressor 31 has not been warmed up after the start of operation, the blower fan 37 does not blow air to avoid blowing cold air into the passenger compartment. Furthermore, until the compressor 31 warms up to the set state,
In order to bring the operating state of the refrigeration cycle closer to the steady state as soon as possible, the blower fan 37 is operated with the minimum air volume.
After the operation of the refrigeration cycle approaches the steady state, the blower voltage Vfan is gradually increased to the maximum voltage. By setting the blower voltage in this way, it is possible to increase the amount of air blown into the vehicle compartment while maintaining the set blown air temperature during warm-up.

In step S8, a temperature Tfine for preventing the heat absorber 35 from freezing or frosting of the glass is calculated. If the heat absorber 35 may freeze,
Tfine is set to a temperature at which the heat absorber 35 does not freeze,
Conversely, if the heat absorber 35 is operating in a state where there is no risk of freezing, Tfine is set to a temperature at which the glass does not fog in relation to the heat load of the vehicle. In step S9, the inlet air temperature Tsuc of the heat absorber 35 is set to the preset temperature T
It is determined whether the temperature is higher than suc1, and the set temperature
If it is higher than 1, the process proceeds to step S10, and if not, the process proceeds to step S11. Heat absorber inlet air temperature Tsuc
When the temperature is higher than the set temperature Tsuc1, it can be determined that the vehicle interior temperature has reached a substantially stable state. Therefore, in step S10, the temperature difference Δ between the heat absorber outlet air temperature Tout and Tfine.
Find θ. On the other hand, when the heat absorber inlet air temperature Tsuc is equal to or lower than the set temperature Tsuc1, the temperature difference Δθ between the heat absorber inlet air temperature Tsuc and Tfine is obtained in step S11.

In step S12, the opening / closing direction of the intake door 42 is selected according to the calculated temperature difference Δθ. That is, when the temperature difference Δθ is lower than the predetermined value −S, the process proceeds to step S13, and since the heat absorber 35 is operating at a temperature lower than the target state set in step S8, the inlet air temperature Tsuc of the heat absorber 35 is reached. The intake door 42 is slightly opened and closed in the direction in which When the temperature difference Δθ is higher than the predetermined value S, the process proceeds to step S15 and the heat absorber 3
5 is operating at a higher temperature than the target state set in step S8, the inlet air temperature Tsuc of the heat absorber 35 is
The intake door 42 is slightly opened and closed in the direction in which
Further, when the temperature difference Δθ is within the range of −S or more and + S or less, the process proceeds to step S14, and since the operating state of the heat absorber 35 is almost in the target state, the current opening degree of the intake door 42 is maintained. In steps S8 to S15, the opening / closing direction of the intake door 42 is set on the basis of the temperature related to the antifreezing of the heat absorber 35 and the antifogging of the glass, but the target blowing air temperature Tof, the radiator outlet air temperature Tvsc, the heat absorber inlet The opening direction of the intake door 42 may be set using the air temperature Tsuc and the inside air temperature Tin. Step S1
In 6, the blowing mode is set according to the target blowing air temperature Tof. When the target blowing air temperature Tof is high, the foot blowing mode FOOT is set to blow the conditioned air to the feet, and the bi-level blowing mode B / L or the vent blowing mode VENT is switched as the target blowing air temperature Tof becomes lower.

In step S17, the opening Xint of the intake door 42 is set to a preset opening Xint. se
It is determined whether or not it is larger than t. At the time of warming up the heating, the operation is started with the inside air circulation mode REC and the foot blowout mode FOOT in the initial state, and the interior of the vehicle is heated by using the compressor input according to the rise of the heat absorber inlet air temperature Tsuc. As the operation of the passenger compartment and the refrigeration cycle approaches a stable state, the inside temperature Tic and the heat absorber outlet air temperature Tout increase, and the blower voltage Vfa.
n also becomes high. At this time, if the intake door 42 is in the internal air circulating state, the heat absorber inlet air temperature Tsuc becomes substantially equal to the internal air temperature Tic. During warm-up, if the blowing mode is switched from the foot blowing mode to the bi-level blowing mode, the defrost blowing mode, and the vent blowing mode to reduce the amount of warm air blown to the feet, the heat absorber inlet air temperature Tsuc decreases and the compressor 31
Since the discharge pressure Pd of No. 1 is decreased, the compressor input is decreased, and the temperature of blown air is decreased and the heating capacity is insufficient. Further, when the heat absorber inlet air temperature Tsuc decreases, the heat absorber outlet air temperature Tout also decreases, so that the heat absorber 35 easily freezes. In this embodiment, the intake door 42 has the heat absorber inlet air temperature Tsuc set to the set temperature Ts.
After reaching uc1, the outside air is gradually taken in so that the heat absorber outlet air temperature Tout becomes the target temperature Tfine. When the intake door 42 starts to open, it is determined that the heat absorber inlet air temperature Tsuc has reached the set temperature Tsuc1 and the interior of the vehicle has approached a stable state, and the heat absorber outlet air temperature Tout is the target temperature Tfine. Therefore, it is judged that the refrigeration cycle is also in a stable state. That is,
It can be judged from the intake door opening Xint that the operation of the passenger compartment and the refrigeration cycle has reached a stable state. In this state, the blowing mode is changed from the foot blowing mode to the bi-level blowing mode, the defrost blowing mode, and the vent blowing mode. Even if the switch is switched to, there will be no reduction in the temperature of blown air or insufficient heating capacity due to the reduction in the air temperature Tsuc of the heat absorber inlet.

In step S17, the intake door opening Xi
nt is the set opening Xint. When set is not reached,
The operation of the refrigeration cycle has not reached a steady state, and moreover, the air flow in the passenger compartment from the front seat side to the rear seat side has not been sufficiently generated. When it is determined that the effect of increasing the heating effect cannot be obtained, the process returns to step S1 and the control during heating is repeated. Conversely, the intake door opening degree Xint is the set opening degree Xint.
When set has been reached, the process proceeds to step S18 in order to enhance the heating feeling in the vehicle compartment by the intermittent blowing mode.
In step S18, it is determined whether or not the blowing mode set in step S16 is the foot blowing mode FOOT. When a mode other than the foot blowout mode is set, it is not necessary to set the blowout mode intermittently because air has already been blown toward the occupant, and the process returns to step S1 to repeat the heating control. .

When the foot blowing mode is set, the foot blowing mode FOOT, the defrost blowing mode D / F, depending on the outlet air temperature Tvsc of the radiator 33 in order to intermittently change the blowing mode in step S19. Set bi-level balloon mode B / L. In the vehicle heat pump type cooling and heating apparatus of the present invention, the air mix door opening Xdsc is fixed to approximately F / H (100%) to perform the heating operation in order to stably operate the refrigeration cycle. Therefore, the outlet air temperature T of the radiator 33
If air is blown toward the occupant when the vsc is high, the occupant's face is hit by the conditioned air having a high temperature, which makes the occupant feel uncomfortable. Therefore, in step S19, when the temperature of the air blown into the vehicle is high, the foot air blow mode is set, and the opening Xint of the intake door 42 is increased to increase the amount of outside air introduced, and as the air blow temperature decreases, the defrosting is performed. The blowing mode D / F and the bi-level blowing mode B / L are switched to set to gradually increase the conditioned air that hits the occupant. Note that step S19
Then, the blowing mode is set according to the radiator outlet air temperature Tvsc, but the target blowing air temperature To
The blowing mode may be set according to f, the heat absorber inlet air temperature Tsuc, and the inside air temperature Tic, or the time factor may be added.

In the above-described embodiment, the intake door opening degree Xint is used to detect the stable state of the interior of the vehicle and the refrigeration cycle. However, the inside air temperature Tic, the heat absorber inlet air temperature Tsuc, the heat absorber outlet air temperature Tout, It may be detected using the blower voltage Vfan, the operating state such as the temperature and pressure of the high-pressure operating portion of the refrigeration cycle, and the like.

In the structure of the above embodiment, the compressor 31 is a compressor, the outdoor unit 38 is an exterior heat exchanger, the radiator 33 is an interior heat exchanger for heat radiation, and the expansion valve 34 is an expansion means. The device 35 constitutes the heat absorption vehicle interior heat exchanger, the three-way valve 32 constitutes the refrigerant flow path switching means, and the control device 43 constitutes the intake door drive control means and the heating warm-up control means.

[0031]

As described above, according to the present invention, the intake door is opened and closed by using the heat load signal such as the temperature related to the anti-freezing of the heat-absorbing passenger compartment heat exchanger and the antifogging of the glass during the warming up of the heating. Since the intake door started operating in the internal air circulation state (fully closed), the opening gradually increases as the operation of the refrigeration cycle approaches a stable state, and the air flow in the passenger compartment from the front seats to the rear seats increases. Can increase the feeling of heating in a short time. Further, when the intake door opening becomes larger than the preset opening, the amount of conditioned air blown from the outlets other than the foot outlet is increased, so that the operation of the passenger compartment and the refrigeration cycle is prevented. It is possible to effectively blow out warm air in a stable state to enhance the heating feeling in the vehicle interior.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment.

FIG. 2 is a block diagram showing the configuration of one embodiment following FIG.

FIG. 3 is a flowchart showing control during heating operation.

FIG. 4 is a flowchart showing control during heating operation, which is subsequent to FIG. 3;

FIG. 5 is a flowchart showing control during heating operation, which is subsequent to FIG. 4;

FIG. 6 is a flowchart showing control during heating operation, which is subsequent to FIG. 5;

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

[Explanation of symbols]

 30 Cooling fan 31 Compressor 32 Three-way valve 33 Radiating indoor heat exchanger (radiator) 34 Expansion valve 35 Endothermic indoor heat exchanger (heat absorber) 36 Liquid tank 37 Blower fan 38 Outdoor heat exchanger (outdoor unit) 39 Duct 40 Inside Air Inlet 41 Outside Air Inlet 42 Intake Door 43 Control Device 44 Blower Motor 46 Air Mix Door 47 Air Mix Chamber 51 Ventilator Outlet 52 Foot Outlet 53 Defroster Outlet 55 Ventilator Door 56 Foot Door 57 Defroster Door 58 Heat Sink Inlet Temperature Sensor 59 Heat absorber outlet temperature sensor 60 Radiator outlet temperature sensor 61 Solar radiation sensor 62 Outside air temperature sensor 63 Room temperature sensor 64 Room temperature setting device 65 Outlet mode switch 66 Blower fan switch 70 check valve 71 re-circulation duct 72 air intake 74 recirculation door 75 switching door

Claims (4)

[Claims] 1. A compressor for adding work to a refrigerant, an exterior heat exchanger for radiating the heat of the refrigerant discharged from the compressor to the outside air, and a refrigerant discharged from the compressor to the air blown by a blowing means. A heat-radiating vehicle interior heat exchanger that radiates the heat of the vehicle to generate warm air, an expansion means connected to the refrigerant outflow side of the heat-radiating vehicle interior heat exchanger, and a refrigerant outflow side of the expansion means and the compressor. An endothermic passenger compartment heat exchanger that is connected to the refrigerant suction side and that absorbs the heat of the air blown by the blower into the refrigerant to form cold air, and is provided on the refrigerant discharge side of the compressor and is discharged from the compressor. The refrigerant flow path switching means for switching whether the refrigerant to be flowed to the heat exchanger outside the vehicle compartment or to the heat exchanger for heat radiation inside the vehicle compartment, and the air-conditioning wind introduced from outside the vehicle compartment A heat pump type air conditioner for a vehicle, comprising: an intake door that adjusts a ratio of incoming air-conditioning air; and a plurality of air-conditioning air outlets including foot air outlets, which relates to freeze prevention of the heat absorbing vehicle interior heat exchanger. At least one of temperature, temperature related to anti-fog of glass, target air temperature, outlet air temperature of the heat-radiating vehicle interior heat exchanger, inlet air temperature of the heat-absorbing vehicle interior heat exchanger, and vehicle interior temperature A heat pump type air conditioner for a vehicle, comprising: an intake door drive control means for drivingly controlling the opening degree of the intake door based on the above. 2. The vehicle heat pump type air conditioner according to claim 1, wherein after the intake door drive control means has reached a preset temperature T1 of an inlet air temperature of the heat absorbing vehicle interior heat exchanger. A heat pump type cooling and heating apparatus for a vehicle, characterized in that the intake door is driven and controlled so that an outlet air temperature of the heat absorbing vehicle interior heat exchanger reaches a preset temperature T2. 3. The vehicle heat pump type air conditioner according to claim 2, wherein the intake door drive control means sets the temperature of the heat absorbing vehicle to a preset temperature T2 when the heat absorbing vehicle interior heat exchanger may freeze. A heat pump type air conditioner for a vehicle, wherein a temperature relating to freezing prevention of a vehicle interior heat exchanger is set, and a temperature relating to antifogging of the glass is set to a set temperature T2 when there is no fear of freezing. 4. The heat pump type air conditioner for a vehicle according to claim 1 or 2, wherein the opening of the intake door becomes larger than a preset opening at the time of warming up the heating, and then the foot blowing is performed. A heat pump type heating and cooling device for a vehicle, comprising: heating warm-up control means for increasing the amount of conditioned air blown from a blowout port other than the blower port.