JP5117944B2 - Air conditioning system for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioning system capable of cooling operation and heating operation.

  A conventional vehicle air conditioning system of this type is disclosed in Patent Document 1. The vehicle air conditioning system 100 includes a front unit 101 and a rear unit 110 as shown in FIG. In the front unit 101, a front-side internal heat exchanger 121 of the heat pump type cooling device 120 and a heater core 131 of the engine cooling circulation device 130 are arranged in this order. An air inlet 102 is provided at the upstream end of the front unit 101, and a plurality of indoor outlets 103 are provided at the downstream end of the front unit 101. In the rear unit 110, a rear-side internal heat exchanger 122 of the heat pump type cooling device 120 is disposed. An air inlet 111 is provided at the upstream end of the rear unit 110, and an outdoor outlet 113 is provided along with the indoor outlet 112 at the downstream end of the rear unit 110. The open / close ratio of the indoor outlet 112 and the outdoor outlet 113 is adjusted by the exhaust door 114.

  The heat pump cooling device 120 includes a compressor 123 that compresses a refrigerant, an external condenser 124, the above-described front-side internal heat exchanger 121, the above-described rear-side internal heat exchanger 122, and a sub heat exchanger 125. In the cooling operation, the front side internal heat exchanger 121 and the rear side internal heat exchanger 122 function as evaporators, and in the heating operation, the front side internal heat exchanger 121 and the rear side internal heat exchanger 122 function as capacitors. In the heat recovery heating operation, the refrigerant path and the refrigerant pressure can be adjusted so that the front side internal heat exchanger 121 functions as a condenser and the rear side internal heat exchanger 122 functions as an evaporator.

  In the heating operation, the air blown into the rear unit 110 is heated by the rear-side internal heat exchanger 122, and hot air obtained by this heating is supplied from the indoor outlet 112 into the vehicle interior. Thereby, the rear side room is heated.

  In the heat recovery heating operation, the air blown into the rear unit 110 is heat-exchanged with the refrigerant in the rear-side internal heat exchanger 122, and the cold air obtained by the heat exchange is exhausted from the outdoor outlet 113 to the outside of the vehicle.

The refrigerant that has passed through the rear-side internal heat exchanger 122 absorbs heat by heat exchange with the air and becomes high temperature. When this high-temperature refrigerant is compressed by the compressor 123, the higher-temperature refrigerant is discharged, so that the heating performance is improved. That is, the heat of the air blown out of the passenger compartment is recovered by the refrigerant to improve the heating performance.
JP 2000-62449 A

  By the way, when the air in the passenger compartment is exhausted outside the passenger compartment, the same amount of outside air is introduced into the passenger compartment. Therefore, when the temperature of the blast that has passed through the rear side internal heat exchanger 122 is higher than the outside air temperature, the outside air having a temperature lower than the exhausted air temperature is introduced into the vehicle interior, so that the heating performance is reduced by that amount. There is a problem of doing. In particular, when the outside air temperature is extremely low, the difference between the temperature of the air to be exhausted and the outside air temperature may become large, and in this case, a situation in which the heating performance is greatly reduced occurs.

  Here, when the temperature of the blast that has passed through the rear side internal heat exchanger 122 is higher than the outside air temperature, it may be introduced into the vehicle interior without exhausting, but it has passed through the rear side internal heat exchanger 122. Since the air is cold air, if this cold air is introduced into the vehicle compartment as it is, the feeling of heating is remarkably hindered, and high quality heating air is not supplied to the vehicle interior.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle air conditioning system capable of performing a heating operation that does not cause a decrease in heating efficiency and can supply high-quality heating air to the passenger compartment.

The invention of claim 1 that achieves the above object includes a first air passage and a second air passage through which the air introduced from the air inlet flows, a heater core that is disposed in the first air passage and heats the air, An evaporator that is disposed in the air flow path and that cools the air flow, is provided downstream of both the heater core and the evaporator, and blows out the air that has flowed into the vehicle interior. And a circulation selection means for guiding the cold air that has passed through the evaporator to the cold air circulation passage, and an exhaust means that can return the cold air that has passed through the evaporator to the heater core via the cold air circulation passage and to be discharged from the exhaust port to the outside of the vehicle compartment. comprising an air conditioning unit, the air inlet port, the first air passage and respectively opening the second air passage, inlet open to the second blowing path is less when A second inside air inlet for introducing the passenger compartment air, the heating operation, if the outlet temperature of the cold air of the evaporator is lower than the outside air temperature, the at least partially vehicle exterior cold air passed through the evaporator The exhaust means is controlled so as to be exhausted, and when the cold air temperature on the outlet side of the evaporator is higher than the outside air temperature, the cold air that has passed through the evaporator is returned to the upstream side of the heater core via the cold air flow path. The selection means is controlled.

  A second aspect of the present invention is the vehicle air conditioning system according to the first aspect, wherein the exhaust port is provided by a branch of the cold air ring passage, and the exhaust port and the air introduction port are disposed in close proximity. Features.

  A third aspect of the present invention is the vehicle air conditioning system according to the second aspect, wherein the exhaust port and the air introduction port are provided in the same intake case.

Invention of Claim 4 is the air conditioning system for vehicles in any one of Claims 1-3 , Comprising: In the air-conditioning unit, the mixing ratio of the cool air which passed the evaporator, and the warm air which passed the heater core It is characterized in that a mixing means capable of adjusting is provided.

A fifth aspect of the present invention is the vehicle air conditioning system according to any one of the first to fourth aspects, wherein the air conditioning unit includes a first blower fan disposed in the first air passage, A second blower fan disposed in the air passage is provided.

A sixth aspect of the present invention is the vehicle air conditioning system according to the fifth aspect , wherein the air conditioning unit is provided with air distribution means capable of adjusting an air distribution ratio between the air sent to the evaporator and the air sent to the heater core. It is characterized by being.

According to the first aspect of the present invention, in the heating operation, when the outlet-side cold air temperature of the evaporator is lower than the outside air temperature, the exhaust means is controlled so that at least a part of the cold air that has passed through the evaporator is exhausted outside the passenger compartment. When the evaporator-side cold air temperature of the evaporator is higher than the outside air temperature, the recirculation selection means is controlled so that the cold air that has passed through the evaporator is returned to the upstream side of the heater core through the cold air recirculation path. Then, when the evaporator outlet cold air temperature is lower than the outside air temperature, at least a part of the cold air that has passed through the evaporator is exhausted outside the vehicle compartment, but outside air that is hotter than the cold air exhausted outside the vehicle interior is introduced into the vehicle interior. As a result, heating efficiency is improved. Also, when the evaporator outlet side cold air temperature is higher than the outside air temperature, the cold air that has passed through the evaporator is returned to the upstream side of the heater core, so that outside air having a temperature lower than that of the evaporator outlet side cold air is introduced into the vehicle interior. There is no. In addition, the cool air that has passed through the evaporator is not mixed with the warm air that has passed through the heater core and introduced into the vehicle interior, but is heated again through the heater core and then introduced into the vehicle interior. As a result, high-quality heating air without temperature unevenness can be introduced into the passenger compartment. As described above, it is possible to perform a heating operation that can supply high-quality heating air to the passenger compartment without lowering the heating efficiency. Further, in the heating mode, since the inside air that is usually warmer than the outside air is led to the evaporator, power saving and heating performance can be improved.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, both the outside air inlet and the outlet of the air inlet need to be installed at positions suitable for opening outside the vehicle compartment. It is an arrangement that is easy to mount.

  According to the invention of claim 3, in addition to the effect of the invention of claim 2, since the outside air inlet and the outlet of the air inlet having substantially the same installation conditions are provided in the same intake case, the handling is easy. is there. It also contributes to the compactness of the air conditioning unit.

According to the invention of claim 4 , in addition to the effects of the inventions of claims 1 to 3 , the mixing means can adjust the mixing ratio of hot air that has passed through the heater core and cold air that has passed through the evaporator, The temperature of the air blown into the passenger compartment can be adjusted to a desired temperature.

According to the invention of claim 5 , in addition to the effects of the inventions of claims 1 to 4 , the amount of hot air from the heater core and the amount of cold air from the evaporator are adjusted by adjusting the outputs of the first and second blower fans. Can be adjusted, so that the temperature of the air blown into the passenger compartment can be adjusted. That is, the heating performance and the cooling performance can be controlled also by adjusting the outputs of the first and second blower fans.

According to the sixth aspect of the invention, in addition to the effect of the fifth aspect of the invention, the air distribution means can freely distribute the air blown by the first blower fan and the air blown by the second blower fan to the evaporator side and the heater core side. The temperature of the air blown into the passenger compartment can be adjusted. That is, the heating performance and the cooling performance can be controlled by adjusting the air distribution means. In particular, by operating the first and second blower fans simultaneously in a state where the second air passage on the evaporator side or the first air passage on the heater core side is completely closed by the air distribution means, the maximum amount of cold air or hot air can be increased. Can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
1 to 7 show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of an air conditioning unit of a vehicle air conditioning system, and FIG. 2 is a schematic configuration diagram of a cooling and cooling refrigerant circulation device of the vehicle air conditioning system. FIG. 3 is a schematic control block diagram of the air conditioning system for a vehicle, FIG. 4 is an intake side control flowchart of the air conditioning unit in the heating mode, FIG. 5 is a schematic configuration diagram showing a full outside air introduction state of the air conditioning unit, and FIG. FIG. 7 is a schematic configuration diagram showing a full outside air introduction state of the air conditioning unit.

  1 and 2, an air conditioning system for a vehicle includes an air conditioning unit 10 disposed outside a vehicle compartment of a vehicle, and a refrigerant circulation device for cooling and heating that uses an evaporator 46 and a heater core 52 disposed in the air conditioning unit 10 as cycle parts. 40.

  The air conditioning unit 10 has a unit case 11 as shown in detail in FIG. The unit case 11 includes an intake case 12 and a main body case 13 to which the intake case 12 is connected. A first air passage 14 and a second air passage 15 for creating conditioned air are provided in the intake case 12 and the main body case 13, respectively. The intake case 12 is provided with an air inlet 16 for introducing air into the first air passage 14 and the second air passage 15.

  The air introduction port 16 includes a first inside air introduction port 17 that opens to the first air passage 14, an outside air introduction port 18 that also opens to the first air passage 14, and a second inside air introduction port that opens to the second air passage 15. 19. The first inside air introduction port 17 and the second inside air introduction port 19 each open to the vehicle interior, and the outside air introduction port 18 opens to the outside of the vehicle interior. The intake case 12 is provided with an inside / outside air switching door 20 that adjusts the inside air introduced from the first inside air introduction port 17 (air in the vehicle interior) and the outside air introduced from the outside air introduction port. The inside / outside air switching door 20 changes between the full inside air introduction position (see FIG. 7) at the solid line position in FIG. 1 and the full outside air introduction position (see FIG. 5) at the phantom line position in FIG. The open / close ratio of the inside air introduction port 17 and the outside air introduction port 18 can be adjusted. An intermediate position between the full inside air position and the full outside air position is a semi-outside air / inside air introduction position (see FIG. 6).

  A first blower fan 21 and a second blower fan 22 are arranged in the first air passage 14 and the second air passage 15 of the intake case 12, respectively. The first blower fan 21 sucks the inside air and the outside air into the first air passage 14. The second blower fan 22 sucks the inside air into the second air passage 15.

  A heater core 52 of the cooling / heating refrigerant circulation device 40 is disposed in the first air passage 14 of the main body case 13, and an evaporator 46 of the cooling / heating refrigerant circulation device 40 is disposed in the second air passage 15. The heater core 52 heats the air blown from the first air passage 14 to produce hot air. The evaporator 46 cools the air blown from the second air passage 15 and produces cold air. The configuration of the cooling / heating refrigerant circulating device 40 will be described in detail below.

  An air distribution door 23 as an air distribution means is provided immediately upstream of the heater core 52 and the evaporator 46 of the main body case 13. The air distribution door 23 can change between a position where all the air introduced into the first air passage 14 and the second air passage 15 is sent to the heater core 52 and a position where all the air sent to the evaporator 46 is sent to the heater core 52. The ratio of the amount of air blown to the evaporator 46 can be adjusted. In the middle position of the solid line in FIG. 1, the air introduced from the first air passage 14 is distributed to the heater core 52, and the air introduced from the second air passage 15 is distributed to the evaporator 46.

  Immediately downstream of the heater core 52 and the evaporator 46 of the main body case 13, a mix chamber 24 where the first air passage 14 and the second air passage 15 merge is provided, and a mix door 25 serving as a mixing unit is provided. . In the mix chamber 24, hot air from the heater core 52 and cold air from the evaporator 46 are mixed or discharged without being mixed depending on the position of the mix door 25. The mix door 25 can change between the full heating position of the solid line position in FIG. 1 and the full cooling position of the virtual line in FIG. The mix chamber 24 is also provided with a differential outlet 26, a vent outlet 27, and a foot outlet 28, which are blower outlets, and air is guided from the outlets 26, 27, and 28 into the vehicle interior. The differential outlet 26 is opened / closed by a differential door 29, the vent outlet 27 is opened / closed by a vent door 30, and the foot outlet 28 is opened / closed by a foot door 31 according to the blowing mode.

  The intake case 12 and the main body case 13 are provided with a cold air return path 32. The cold air recirculation path 32 has a cold air recirculation inlet 32 a immediately downstream of the evaporator 46, and a cold air recirculation outlet 32 b further upstream of the first blower fan 21 in the first air passage 14 (position upstream of the heater core 52). The cold air recirculation inlet 32a is opened and closed by a recirculation door 33 which is a recirculation selection means. An exhaust port 34 is provided at a position immediately upstream of the cold air return passage 32b of the cold air return path 32 by a branch, and the exhaust port 34 opens outside the vehicle compartment. The exhaust port 34 is set at a position where ram pressure does not act. The open / close ratio of the cold air recirculation outlet 32b and the exhaust outlet 34 can be adjusted by an exhaust door 35 which is an exhaust means. The exhaust door 35 circulates all the recirculated cold air to the first air passage 14 at the solid line position in FIG. 1 and exhausts all the recirculated cold air to the outside of the vehicle compartment at the phantom line position in FIG. At the intermediate position between the solid line position in FIG. 1 and the phantom line position in FIG. 1, half of the reflux cold air is returned to the first air passage 14 and the other half is exhausted outside the passenger compartment.

  The vehicle air conditioning system also includes a vehicle interior temperature detection sensor 36 that detects the temperature in the vehicle interior, an outside air temperature detection sensor 37 that detects the temperature of the outside air, and an evaporator exit cold air temperature that detects the outlet side cold air temperature of the evaporator 46. A detection sensor 38 and the like are provided.

  Next, the refrigerant circulation device 40 for air conditioning will be described. As shown in FIG. 2, the cooling and heating refrigerant circulation device 40 is configured by a combination of a heat pump type cooling device A and a heating circulation device B.

  The heat pump type cooling device A has a first circulation path 41 filled with carbon dioxide as a first refrigerant, and in this first circulation path 41, a compressor 42, a water-cooled condenser 43 as a condenser, an internal heat exchange. A vessel 44, an expansion valve 45 as an expansion means, an evaporator 46, and an accumulator 47 are provided in this order. That is, a refrigeration cycle is configured.

  The compressor 42 compresses the sucked relatively low temperature and low pressure first refrigerant and discharges it as a high temperature and high pressure refrigerant.

  The water-cooled condenser 43 is disposed in a device storage chamber 55 in the second circulation path 48 described below, and cools the first refrigerant pumped from the compressor 42 with the second refrigerant. That is, heat exchange is performed between the first refrigerant and the second refrigerant in the water-cooled condenser 43, and the second refrigerant is heated by the first refrigerant.

  The internal heat exchanger 44 exchanges heat between the first refrigerant sent from the water-cooled condenser 43 and the cooler first refrigerant sent from the accumulator 47, and the first refrigerant sent from the water-cooled condenser 43. Is further cooled.

  The expansion valve 45 expands (depressurizes) the first refrigerant that has passed through the internal heat exchanger 44 and sends it to the evaporator 46 as a low-temperature and low-pressure gas.

  The evaporator 46 uses the low pressure side of the refrigeration cycle as a heat source, and heat-exchanges the first refrigerant sent from the expansion valve 45 and the air passing through the evaporator 46 to cool the air.

  The accumulator 47 gas-liquid-separates the first refrigerant sent from the evaporator 46 and sends only the first refrigerant in the gas phase state to the internal heat exchanger 44, and temporarily stores the first refrigerant in the liquid phase state. To be stored.

  The heating circulation device B has a second circulation path 48 in which a liquid such as water or antifreeze as a second refrigerant is enclosed, and in this second circulation path 48, a pump 49, a radiator 50, and a device storage chamber. 55 and the heater core 52 are provided in this order. The device storage chamber 55 is a space having a larger cross-sectional area than the second circulation path 48, and the electric heater 51, which is a heater, is stored in the interior together with the above-described water-cooled condenser 43.

  The pump 49 pressurizes and pumps the sucked second refrigerant in order to circulate the second refrigerant in the second circulation path 48. The liquid refrigerant pumped by the pump 49 circulates in the second circulation path 48 without changing the phase and changes in sensible heat by heat exchange.

  The radiator 50 radiates the heat of the second refrigerant to the outside air. The outside air is blown by an electric fan or traveling wind, and heat exchange is performed between the second refrigerant and the outside air.

  The electric heater 51 is provided on the downstream side of the water-cooled condenser 43 and generates heat when energized to heat the second refrigerant.

  The heater core 52 uses the high pressure side of the refrigeration cycle and the electric heater 51 as heat sources, and heat-exchanges the air that passes through the second refrigerant and the heater core 52 to heat the air.

  The second circulation path 48 is provided with a radiator bypass passage 53 that bypasses the radiator 50, and the second switching path 54 is switched by switching a passage switching valve 54 provided on the upstream side of the radiator bypass passage 53. The flow of the refrigerant can be switched to the radiator 50 side or the radiator bypass channel 53 side.

  Next, the control system of the vehicle air conditioning system will be briefly described. As shown in FIG. 3, the detection data of the vehicle interior temperature detection sensor 36, the outside air temperature detection sensor 37, and the outlet air cool air temperature detection sensor 38 are input to the control unit 39. The control unit 39 controls the driving of the compressor 42, the pump 49, the electric heater 51, the first blower motor 21a, and the second blower motor 22a, and controls the switching of the flow path switching valve 54. Moreover, the control part 39 controls the drive of various door motor 20a, 23a, 25a, 29a, 30a, 31a, 33a, 35a. And in the heating mode, the flowchart shown in FIG. 4 is performed. The specific contents of this flowchart will be described below.

  Next, the operation of the vehicle air conditioning system will be described. In this air conditioning system for a vehicle, a cooling operation for lowering the cabin temperature using at least the cool air that has passed through the evaporator 46 out of the heater core 52 and the evaporator 46, and at least the heater core 52 out of the heater core 52 and the evaporator 46. It is possible to perform a heating operation that raises the passenger compartment temperature using warm air.

  When the cooling operation is selected, the compressor 42 of the heat pump type cooling device A is driven and the pump 49 of the heating circulation device B is driven, but the electric heater 51 is not turned on. Further, the flow path switching valve 54 is normally on the radiator 50 side. Thereby, since the heat of the water-cooled condenser 43 is dissipated through the heater core 52 and the radiator 50 of the heating circulation device B, the heat pump type cooling device A absorbs heat from the air that the evaporator 46 passes through the second air passage 15. And the ventilation which passes the 2nd ventilation path 15 is made into cold wind. Further, the air passing through the first air passage 14 is also made warm air by the heater core 52, and hot air can be obtained from the first air passage 14. The cold air thus obtained is directly or air-mixed with the warm air that has passed through the heater core 52, and the cool air having a desired temperature is introduced into the passenger compartment.

  When the heating operation is selected, the pump 49 of the heating circulation device B is driven, and at least one of the compressor 42 and the electric heater 51 of the heat pump type cooling device A is driven. Although details of the driving / non-driving conditions of the compressor 42 and the electric heater 51 of the heat pump cooling device A are omitted, the following description will be made assuming that the compressor 42 is driven. Moreover, the flow path switching valve 54 is normally on the radiator bypass flow path 53 side. As a result, in the heating circulation device B, the second refrigerant is heated by the heat radiation from the water-cooled condenser 43 and the heat radiation from the electric heater 51, and the heater core 52 radiates heat to the air passing through the first air passage 14, thereby The air that passes through the path 14 is warm air. Further, the air passing through the second air passage 15 is also cooled by the evaporator 46.

  In the heating operation, normally, the air distribution door 23 is positioned at the intermediate position, the mix door 25 is positioned at the full heating position, and the return door 33 is positioned at the open position of the cold air return inlet 32a. As a result, all the cold air that has passed through the evaporator 46 is guided to the cold air recirculation path 32.

  Next, operations related to air introduction / exhaust in the heating operation will be described in detail. As shown in FIG. 4, when the heating operation is selected (step S1), it is checked whether or not the outlet-side cold air temperature Tevap of the evaporator 46 is a temperature exceeding the outside air temperature Tamb (step S2). If the outlet side cold air temperature Tevap of the evaporator 46 is higher than the outside air temperature Tamb, as shown in FIG. 7, the exhaust door 35 and the inside / outside air switching door 20 are set to the full inside air position (step S3).

  If the outlet side cold air temperature Tevap of the evaporator 46 is lower than the outside air temperature Tamb, it is checked whether or not the temperature difference is equal to or higher than B ° C. (for example, 10 ° C.) (step S22). If the temperature difference is B ° C. (for example, 10 ° C.) or more, as shown in FIG. 5, the exhaust door 35 and the inside / outside air switching door 20 are set to the full outside air position (step S5). If the temperature difference is less than B ° C. (eg, 10 ° C.), as shown in FIG. 6, the exhaust door 35 and the inside / outside air switching door 20 are set to the half inside / outside air position (step S6).

  Next, the case where the outside air temperature at the start of the vehicle air conditioning system is extremely low (for example, −20 ° C.) will be described. If the outside air temperature Tamb is −20 ° C., the passenger compartment temperature is also about −20 ° C. When the heating operation is selected (step S1 in FIG. 4), the electric heater 51 is driven to gradually heat the passenger compartment temperature. When the passenger compartment temperature Tr reaches −10 ° C., the compressor 42 is driven, and the air passing through the second air passage 15 is cooled by the evaporator 46, and the outlet side cold air temperature Tevap of the evaporator 46 is B ° C. (for example, 10 ° C.) from the outside air temperature Tamb. C.) or more (step S4 in FIG. 4). Then, the exhaust door 35 and the inside / outside air switching door 20 are set to the full outside air position shown in FIG. 5 (step S5 in FIG. 4). Exhausted. Then, outside air of −20 ° C. is introduced from the outside air inlet 18. Since the introduced outside air is hotter than the cold air that has passed through the evaporator 46, heating can be performed more efficiently than when the outside air is heated.

  When the vehicle interior temperature gradually rises, the temperature of the cold air that has passed through the evaporator 46 also gradually increases, and the outlet side cold air temperature Tevap of the evaporator 46 has a temperature difference less than B ° C. (for example, 10 ° C.) from the outside air temperature Tamb. The temperature is reached (step S4 in FIG. 4). Then, the exhaust door 35 and the inside / outside air switching door 20 are set to the semi-outside air / inside air position shown in FIG. 6 (step S6 in FIG. 4), and the cold air that has passed through the evaporator 46 passes through the cold air recirculation path 32 from the exhaust port 34. Half is exhausted, and the other half is returned to the upstream of the heater core 52. The mixed air of the outside air and the reflux cold air flows into the first air passage 14, the mixed air is heated by the heater core 52, and the heated hot air is introduced into the vehicle interior.

  When the vehicle interior temperature further rises, the temperature of the cold air that has passed through the evaporator 46 also becomes higher, and the outlet-side cold air temperature Tevap of the evaporator 46 becomes higher than the outside air temperature Tamb (step S2 in FIG. 4). Then, the exhaust door 35 and the inside / outside air switching door 20 are set to the full inside air position shown in FIG. 7 (step S3 in FIG. 4), and all the cool air that has passed through the evaporator 46 is returned to the upstream of the heater core 52. The reflux cold air is heated by the heater core 52, and the heated hot air is introduced into the vehicle interior. Since the cold air that has passed through the evaporator 46 is hotter than the outside air, heating can be performed more efficiently than heating the outside air.

  The cold air that has passed through the evaporator 46 is not mixed with the hot air that has passed through the heater core 52 downstream of the heater core 52 and introduced into the vehicle interior, but is heated again through the heater core 52 and then into the vehicle interior. Since it is introduced, high-quality heating air with no temperature unevenness is introduced as warm air into the passenger compartment.

  In the heating mode described above, the position of the air distribution door 23 is described as the intermediate position, but the ratio of the air blowing to the first air passage 14 and the air blowing to the second air passage 15 can be adjusted by the position of the air distributing door 23. Although the position of the mix door 25 is described as the full heating position, the mixing ratio of the hot air that has passed through the heater core 52 and the cold air that has passed through the evaporator 46 is adjusted according to the position of the mix door 25, and the blowing temperature into the vehicle interior is adjusted. Can be adjusted. Furthermore, by adjusting the air blow outputs of the first blower fan 21 and the second blower fan 22 separately, the air blow amount to the first air passage 14 and the air blow amount to the second air passage 15 can be adjusted.

  As described above, in this vehicle-mounted air conditioning system, when the outlet-side cold air temperature Tevap of the evaporator 46 is lower than the outside air temperature Tamb, at least a part of the cold air that has passed through the evaporator 46 is exhausted outside the passenger compartment. Controlling the door 35, when the outlet side cold air temperature Tevap of the evaporator 46 is higher than the outside air temperature Tamb, the recirculation door 33 is set so that the cold air that has passed through the evaporator 46 is returned to the upstream side of the heater core 52 through the cold air recirculation path 32. Control. Therefore, when the outlet-side cold air temperature Tevap of the evaporator 46 is lower than the outside air temperature Tamb, at least a part of the cold air that has passed through the evaporator 46 is exhausted outside the vehicle compartment, but outside air that is hotter than the cold air exhausted outside the vehicle interior is exhausted. Since it is introduced into the passenger compartment, the heating efficiency is improved. Further, when the outlet-side cold air temperature Tevap of the evaporator 46 is higher than the outside air temperature Tamb, the cold air that has passed through the evaporator 46 is returned to the upstream side of the heater core 52, so that the outside air having a lower temperature than the outlet-side cold air of the evaporator 46 is It is not introduced indoors. In addition, the cool air that has passed through the evaporator 46 is not mixed with the hot air that has passed through the heater core 52 downstream of the heater core 52 and introduced into the vehicle interior. Therefore, high-quality heating air with no temperature unevenness is introduced into the passenger compartment as hot air. As described above, it is possible to perform a heating operation that can supply high-quality heating air to the passenger compartment without lowering the heating efficiency.

  In this embodiment, the exhaust port 34 is provided by a branch of the cold air ring flow path 32, and the exhaust port 34 and the air introduction port 16 are arranged in close proximity. Accordingly, both the outside air introduction port 18 and the exhaust port 34 of the air introduction port 16 need to be installed at positions suitable for opening to the outside of the passenger compartment, and thus are easily mounted on the vehicle.

  In this embodiment, the exhaust port 34 and the air introduction port 16 are provided in the same intake case 12. Since the outside air introduction port 18 and the exhaust port 34 of the air introduction port 16 having substantially the same installation conditions are provided in the same intake case 12, the handling is easy. In addition, the air conditioning unit 11 can be made compact.

  In this embodiment, the air inlet 16 opens to the first air passage 14 and the second air passage 15, respectively, and the inlet that opens to the second air passage 15 introduces the second inside air that introduces the air in the vehicle interior. Only the mouth 19. In the heating mode, the inside air, which is normally warmer than the outside air, is led to the evaporator 46, so that power saving and heating performance can be improved. In addition, the inlet opening opened to the 2nd ventilation path 15 is good also as both the 2nd inside air introduction opening 19 and the inside air introduction opening similarly to the introduction opening opened to the 1st ventilation path 14. FIG.

  In this embodiment, the air conditioning unit 11 is provided with a mixing door 25 that can adjust the mixing ratio of the cold air that has passed through the evaporator 46 and the hot air that has passed through the heater core 52. Therefore, since the mixing ratio of the hot air that has passed through the heater core 52 and the cold air that has passed through the evaporator 46 can be adjusted depending on the position of the mix door 25, the temperature of the air blown into the vehicle compartment can be adjusted to a desired temperature.

  In this embodiment, the air conditioning unit 11 is provided with a first blower fan 21 disposed in the first air passage 14 and a second blower fan 22 disposed in the second air passage 15. Accordingly, by adjusting the outputs of the first blower fan 21 and the second blower fan 22, the amount of hot air from the heater core 52 and the amount of cold air from the evaporator 46 can be adjusted, so that the temperature of the air blown into the vehicle compartment can be adjusted. That is, the heating performance and the cooling performance can be controlled by adjusting the outputs of the first blower fan 21 and the second blower fan 22, and fine control is possible.

  In this embodiment, the air conditioning unit 11 is provided with the air distribution door 23 that can adjust the air distribution ratio between the air blown to the evaporator 46 and the air blown to the heater core 52. Accordingly, since the air blown by the first blower fan 21 and the air blown by the second blower fan 22 can be freely distributed to the evaporator 46 side and the heater core 52 side depending on the position of the air distribution door 23, the temperature at which the air is blown into the vehicle interior can be adjusted. . That is, the heating performance and the cooling performance can be controlled by adjusting the air distribution door 23, and fine control is possible. In particular, the first blower fan 21 and the second blower fan 22 are simultaneously operated in a state where the second air passage 15 on the evaporator 46 side or the first air passage 14 on the heater core 52 side is completely closed by the air distribution door 23. The maximum air volume of cold air or hot air can be increased.

  In this embodiment, when the outlet-side cold air temperature Tevap of the evaporator 46 is lower than the outside air temperature Tamb and the temperature difference is small (less than B ° C.), only a part of the cold air that has passed through the evaporator 46 is placed outside the passenger compartment. When the exhaust air is exhausted and other cold air is introduced into the passenger compartment, and the outlet side cold air temperature Tevap of the evaporator 46 is lower than the outside air temperature Tamb and the temperature difference is large (B ° C. or more), the cold air that has passed through the evaporator 46 All of these were configured to exhaust outside the passenger compartment. Therefore, it is possible to prevent the uncomfortable feeling of heating as much as possible during the transition from the introduction of outside air to the introduction of inside air.

  In this embodiment, since the inside / outside air switching door 20 is similarly switched in conjunction with the exhaust door 35, when the inside air is discharged from the exhaust port 34 to the outside of the passenger compartment, the outside air enters from the outside air introduction port 18, The outside air that has entered always passes through the heater core 52 and is introduced into the passenger compartment. Therefore, it is possible to avoid as much as possible the situation where outside air enters through the gap between the doors of the vehicle, and the interior of the vehicle can be made a high-quality heating space.

  In this embodiment, the cool air return path 32 returns the cool air further upstream than the first blower fan 21, so that the cool air returned from the cool air return path 32 and the air introduced from the air inlet 16 are the first blower fan. After being stirred by the heater 21, the air is guided to the heater core 52, so that the cool air without temperature unevenness is guided to the heater core 52, and the warm air without temperature unevenness is discharged from the heater core 52. Therefore, air mix property improves.

(Other)
In the above embodiment, the electric heater 51 is used as the heater, but the same action and effect can be obtained even if a combustion heater or the like is used.

  In the above embodiment, carbon dioxide is used as the first refrigerant, and liquid such as water or antifreeze liquid is used as the second refrigerant, but it goes without saying that other than these may be used as the refrigerant.

1 is a schematic configuration diagram of an air conditioning unit of a vehicle air conditioning system according to an embodiment of the present invention. 1 shows an embodiment of the present invention and is a schematic configuration diagram of a refrigerant circulation device for cooling and heating of an air conditioning system for a vehicle. 1 is a schematic control block diagram of a vehicle air conditioning system according to an embodiment of the present invention. It is an intake side control flowchart of the air-conditioning unit in the heating mode according to the embodiment of the present invention. It is a schematic block diagram which shows one Embodiment of this invention and shows the full external air introduction | transduction state of an air conditioning unit. It is a schematic block diagram which shows one Embodiment of this invention and shows the outside air / inside air introduction | transduction state of an air conditioning unit. It is a schematic block diagram which shows one Embodiment of this invention and shows the full external air introduction | transduction state of an air conditioning unit. It is a schematic block diagram of the vehicle air conditioning system of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Air conditioning unit 12 Intake case 14 1st ventilation path 15 2nd ventilation path 16 Air inlet 19 Second inside air inlet (air inlet)
21 1st blower fan 22 2nd blower fan 23 Air distribution door (air distribution means)
25 Mix door (mixing means)
26 Differential outlet (air outlet)
27 Vent outlet (air outlet)
28 Foot outlet (air outlet)
32 Cold air return path 33 Return door (Reflux selection means)
34 Exhaust port 35 Exhaust door (exhaust means)
46 Evaporator 52 Heater core

Claims (6)

A first air passage (14) and a second air passage (15) through which the air introduced from the air introduction port (16) flows, respectively, and a heater core (52) which is disposed in the first air passage (14) and heats the air. And an evaporator (46) that is disposed in the second air passage (15) and cools the air, and is provided downstream of both the heater core (52) and the evaporator (46). A ventilation outlet (26), (27), (28) for guiding, a cold air passage (32) for returning the cold air that has passed through the evaporator (46) to the upstream side of the heater core (52), and the evaporator (46) A circulating flow selecting means (33) for guiding the passing cold air to the cold air circulation channel (32), and returning the cold air having passed through the evaporator (46) to the heater core (52) via the cold air circulation channel (32) or exhausting it. (34) provided with an air-conditioning unit (11) having a from the exhaust means (35) capable or discharged outside the vehicle compartment,
The air inlet (16) opens to the first air passage (14) and the second air passage (15), respectively, and the air inlet opening to the second air passage (15) is at least in the passenger compartment. A second inside air inlet (19) for introducing air;
In the heating operation, when the outlet-side cold air temperature of the evaporator (46) is lower than the outside air temperature, the exhaust means (35) is provided so that at least a part of the cold air that has passed through the evaporator (46) is exhausted outside the passenger compartment. When the outlet side cold air temperature of the evaporator (46) is higher than the outside air temperature, the cold air that has passed through the evaporator (46) is upstream of the heater core (52) via the cold air flow passage (32). The vehicle air conditioning system is characterized in that the reflux selection means (33) is controlled so as to return to the initial value. The vehicle air conditioning system according to claim 1,
The exhaust port (34) is provided by a branch of the cold air flow path (32), and the exhaust port (34) and the air introduction port (16) are arranged in close proximity. Air conditioning system. The vehicle air conditioning system according to claim 2,
The air conditioning system for vehicles, wherein the exhaust port (34) and the air introduction port (16) are provided in the same intake case (12).   It is an air conditioning system for vehicles in any one of Claims 1-3,
  The air conditioning unit (11) is provided with a mixing means (25) capable of adjusting a mixing ratio of the cold air that has passed through the evaporator (46) and the hot air that has passed through the heater core (52). Air conditioning system for vehicles.   It is an air conditioning system for vehicles in any one of Claims 1-4,
  The air conditioning unit (11) includes a first blower fan (21) disposed in the first air passage (14) and a second blower fan (22) disposed in the second air passage (15). An air conditioning system for vehicles characterized by being provided.   The vehicle air conditioning system according to claim 5,
  The air conditioning unit (11) is provided with air distribution means (23) capable of adjusting an air distribution ratio between the air sent to the evaporator (46) and the air sent to the heater core (52). Air conditioning system for vehicles.

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