JP2020044924A - Vehicle air conditioning system - Google Patents

Abstract

To improve comfort for an occupant by efficient heating operation even when an outside air temperature is low.SOLUTION: A vehicle air conditioning system 10 includes: an air flow passage part 11 in which air supplied to a cabin space 3 flows; a blower 20 which is arranged in the air flow passage part 11 and sends the air to the cabin space 3: a heater core 40 which is arranged in the air flow passage part 11 and heats the air by a liquid medium used in a vehicle 1 as a heat source; a blowout port 14 which blows out the air through the heater core 40 to the cabin space 3; an air circulation path 50 having an air intake port 51 which is arranged at a downstream side of a flow direction of the air than the heater core 40 and takes a part of the air through the heater core 40 from the air flow passage part 11, a heater upstream side discharge port 52 and an evaporator upstream side discharge port 53 which are arranged at an upstream side of a flow direction of the air than the heater core 40 and discharge a part of the air taken from the air intake port 51 to the air flow passage part 11.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle air conditioning system.

In the air conditioning system for vehicles, various devices have been devised in order to enhance the comfort of occupants in the vehicle.
For example, in Patent Literature 1, a bypass path is provided between an outside air inlet and an anti-fog outlet, and in a region where the vehicle interior temperature during heating approaches a set temperature, one of the outside air introduced from the outside air inlet is provided. A configuration is disclosed in which a portion is supplied from a fogging prevention outlet to a vehicle interior via a bypass without passing through a heater core. With this configuration, it is possible to prevent the vehicle interior temperature from rising above the set temperature.

JP-A-6-55923 (paragraphs [0010] to [0011], and FIGS. 1 and 3)

By the way, the air supplied into the vehicle during the heating operation is heated by the heater core. The heater core uses cooling water heated by cooling the engine of the vehicle as a heat source. As the efficiency of an engine mounted on a vehicle is improved and the displacement is reduced, the temperature of cooling water sent to the heater core is unlikely to increase and tends to decrease. Then, for example, in a winter or a cold region, even if the heating operation is performed in a state where the outside air temperature is low and the temperature of the cooling water is low, immediately after the heating operation is started, the temperature of the air supplied into the vehicle does not easily rise. .
Further, when the vehicle is an electric vehicle, the air supplied into the vehicle is heated by the heat of the heat pump. However, in a state where the outside air temperature is low, the performance of the heat pump is not sufficient.

  The present invention has been made in view of such circumstances, and provides an air conditioning system for a vehicle that can efficiently perform a heating operation and enhance occupant comfort even in a low external temperature state. The purpose is to provide.

In order to solve the above problems, the vehicle air conditioning system of the present invention employs the following means.
That is, an air conditioning system for a vehicle according to the present invention includes an air flow path portion through which air supplied to a vehicle interior space flows, a blower provided in the air flow portion to send air to the vehicle interior space, A heat exchanger for heating the air using a liquid medium used in a vehicle as a heat source, an outlet for blowing the air passing through the heat exchanger into the vehicle interior space, and the air rather than the heat exchanger. An air inlet that is provided on the downstream side in the flow direction of the air and takes in a part of the air that has passed through the heat exchanger from the air flow path portion, and is provided on the upstream side in the air flow direction of the air from the heat exchanger And an air circulation path having an air discharge port for discharging the air taken in from the air intake port to the air flow path portion.

  ADVANTAGE OF THE INVENTION According to the air conditioning system for vehicles which concerns on this invention, a part of air which passed through the heat exchanger is taken into an air circulation path from an air intake. The air taken into the air circulation path is discharged to an air flow path from an air discharge port provided on the upstream side of the heat exchanger. Thereby, the air heated via the heat exchanger is supplied to the upstream side of the heat exchanger via the air circulation path, and the air temperature on the inlet side of the heat exchanger increases. When this air is heated by the heat exchanger, the temperature of the air at the outlet of the heat exchanger also increases. As a result, the temperature of the air blown out from the outlet through the heat exchanger into the vehicle interior space increases efficiently. Therefore, even when the outside air temperature is low, it is possible to efficiently perform the heating operation and enhance the comfort of the occupant.

  In the vehicle air conditioning system, it is further preferable that the air discharge port is provided downstream of the blower in a flow direction of the air.

  According to such an air conditioning system for a vehicle, air can be discharged from the air discharge port to the air flow path at a position downstream of the blower and closer to the heat exchanger. Thereby, the air discharged from the air discharge port reaches the heat exchanger without passing through the blower. Therefore, it is possible to prevent the temperature of the air discharged from the air discharge port from decreasing before reaching the heat exchanger.

  The air conditioning system for a vehicle further includes a dehumidifying unit that is provided in the air flow path unit upstream of the heat exchanger in the air flow direction, and that dehumidifies the air. It is more preferable that the heat exchanger is provided between the dehumidifying section and the heat exchanger in the flow direction.

  According to such an air conditioning system for a vehicle, air can be discharged from the air discharge port of the air circulation path at a position downstream of the dehumidifying unit and closer to the heat exchanger. Thus, the air discharged from the air discharge port reaches the heat exchanger without passing through the dehumidifying unit. Therefore, it is possible to suppress the temperature of the air discharged from the air discharge port via the heat exchanger from decreasing before reaching the heat exchanger.

  In the vehicle air conditioning system, it is further preferable that the air discharge port is provided upstream of the dehumidifying unit in a flow direction of the air.

  According to such an air conditioning system for a vehicle, the air heated via the heat exchanger is supplied to the upstream side of the dehumidifying unit via the air circulation path. By passing this air through the dehumidifying section, the air supplied to the vehicle interior space is dehumidified. As a result, it is possible to suppress fogging and the like of the window provided in the vehicle and enhance the comfort of the occupant.

  In the air conditioning system for a vehicle, a flow path opening / closing section provided at at least one of the air intake port and the air discharge port to interrupt the discharge of the air to an upstream side of the heat exchanger; It is more preferable that a control unit that controls the road opening and closing unit is provided.

  According to such a vehicle air conditioning system, the control unit controls the flow path opening / closing unit based on various conditions, so that the heating operation can be automatically performed efficiently even when the outside air temperature is low. It is possible to appropriately increase the comfort of the occupant.

  In the air conditioning system for a vehicle, when the outside air temperature is lower than a predetermined temperature reference value, the control unit opens the passage opening / closing unit, and the upstream side of the heat exchanger passes through the air circulation path. It is more preferable to discharge air.

  According to such a vehicle air conditioning system, when the outside air temperature is lower than the temperature reference value, the air heated through the heat exchanger is automatically circulated to the upstream side of the heat exchanger through the air circulation path. Can be done.

  In the air conditioning system for a vehicle, when the humidity of the air is higher than a predetermined humidity reference value, the control unit opens the passage opening / closing unit and is located upstream of a dehumidifying unit that dehumidifies the air. It is more preferable to discharge the air.

  According to such an air conditioning system for a vehicle, when the humidity of the air is higher than the humidity reference value, the air heated through the heat exchanger automatically passes through the dehumidifying unit. This makes it possible to appropriately dehumidify the air supplied to the vehicle interior space.

  In the vehicle air conditioning system, it is further preferable that the control unit stops the operation of the blower when a temperature of the liquid medium is lower than a predetermined liquid medium temperature reference value.

  According to such an air conditioning system for a vehicle, when the temperature of the liquid medium is excessively low, even if the air passes through the heat exchanger, the air is not sufficiently heated. In such a case, if air is supplied to the vehicle interior space from the air outlet by operating the blower, the temperature of the vehicle interior space may decrease. Therefore, in such a state, by stopping the operation of the blower, it is possible to suppress a decrease in the temperature of the vehicle interior space.

  In the above-described vehicle air conditioning system, it is further preferable that the control unit increases the flow rate of the air in the blower when discharging the air into the air flow path unit through the air circulation path.

  According to such an air conditioning system for a vehicle, when a portion of the air that has passed through the heat exchanger passes through the air circulation path, the air is blown out from the outlet into the interior section of the vehicle as compared with a case where the air does not pass through the air circulation path. The decrease in the amount of air flow can be compensated for by the increase in the amount of air flow in the blower.

  According to the vehicle air conditioning system of the present invention, even when the outside air temperature is low, the heating operation can be performed efficiently and the comfort of the occupant can be improved.

It is a figure showing the schematic structure of the air conditioning system for vehicles concerning one embodiment of the present invention. It is a figure showing the state where air is circulated to the upper stream side of the heater core through the air circulation way in the air conditioning system for vehicles concerning one embodiment of the present invention. It is a figure showing the state where air is circulated to the upper stream side of an evaporator through an air circulation way in the air conditioning system for vehicles concerning one embodiment of the present invention. It is a figure showing the flow of the control method of the air conditioning system for vehicles concerning one embodiment of the present invention. It is a figure showing the flow of inside air circulation operation in the control method of the air conditioning system for vehicles concerning one embodiment of the present invention. It is a figure showing the flow of the dehumidification circulation operation in the control method of the air conditioning system for vehicles concerning one embodiment of the present invention. FIG. 3 is a diagram showing a state in which air is circulated to the upstream side of the heater core through the air circulation path in the outside air introduction mode in the vehicle air conditioning system according to one embodiment of the present invention. It is a figure showing the flow of outside air circulation operation in the control method of the air conditioning system for vehicles concerning one embodiment of the present invention.

An embodiment according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a vehicle air conditioning system 10 is provided in a vehicle 1 such as an automobile. The vehicle air conditioning system 10 adjusts the temperature and humidity of air taken in from the outside space 2 outside the vehicle 1 and the inside space 3 inside the vehicle 1 and supplies the air to the inside space 3.
The vehicle air conditioning system 10 mainly includes an air flow path unit 11, a blower 20, an evaporator (dehumidifying unit) 30, a heater core (heat exchanger) 40, an air circulation path 50, and a control unit 60. Have.

  The air passage section 11 forms a passage through which air supplied to the vehicle interior space 3 flows. The air passage section 11 includes an outside air intake 12 that takes in air from the outside space 2, an inside air intake 13 that takes in air from the inside space 3, and an outlet 14 that blows air into the inside space 3. I have.

  The outside air intake 12 is provided with a duct 12d that can be opened and closed. By opening and closing the duct 12d, the intake of air from the outside space 2 at the outside air intake port 12 can be intermittently performed. When the outside air intake 12 is opened by the duct 12 d, the air (outside air) of the outside space 2 taken in from the outside air intake 12 and the inside of the car taken in from the inside air intake 13 are provided in the air flow path 11. The air (inside air) in the space 3 is taken in. When the outside air intake 12 is closed by the duct 12 d, the air from the in-vehicle space 3 is taken into the air flow path 11 through the inside air intake 13.

  The air outlet 14 includes a defroster air outlet 14A that blows air toward a window of the vehicle 1, a main air outlet 14B that blows air mainly toward the upper limb of an occupant seated on a seat (not shown) in the vehicle 1, and And a foot outlet 14C for blowing air toward the feet of the occupant seated on the seat. Of course, the outlet 14 can be appropriately provided so as to blow air toward other parts.

  The blower 20 is provided in the air flow path unit 11 and sends air to the vehicle interior space 3. The blower 20 sends air from the outside air intake 12 and the inside air intake 13 toward the air outlet 14.

  The evaporator 30 exchanges heat with the refrigerant compressed by the compressor 31 to cool and dehumidify the air flowing through the air flow path unit 11. The evaporator 30 is provided in the air flow path 11, and is provided downstream of the blower 20 in the air flow direction in the air flow path 11. The evaporator 30 is provided upstream of the heater core 40 in the air flow direction.

  The heater core 40 heats the air flowing through the air flow path 11 using a cooling water (liquid medium) of an engine (not shown) used in the vehicle 1 as a heat source. The heater core 40 is provided in the air flow path 11, and is provided downstream of the evaporator 30 in the air flow direction in the air flow path 11.

  A mixture valve 15 is provided in the air flow path 11 so as to be openable and closable, adjacent to the heater core 40. By adjusting the opening of the mixture valve 15, the amount of air flowing through the heater core 40 is adjusted.

The air circulation path 50 circulates a part of the air that has passed through the heater core 40 to the air flow path 11 on the upstream side of the heater core 40 in the air flow direction. The air circulation path 50 includes an air intake port 51, a heater upstream discharge port (air discharge port) 52, and an evaporator upstream discharge port (air discharge port) 53.
The air intake port 51 is provided downstream of the heater core 40 in the air flow direction, and takes in a part of the air that has passed through the heater core 40 from the air flow path 11 into the air circulation path 50.

The heater upstream discharge port 52 and the evaporator upstream discharge port 53 are provided downstream of the blower 20 in the air flow direction. The heater upstream discharge port 52 and the evaporator upstream discharge port 53 discharge the air in the air circulation path 50 to the air flow path 11.
The heater upstream discharge port 52 is provided upstream of the heater core 40 in the air flow direction. The heater upstream discharge port 52 is provided between the evaporator 30 and the heater core 40 in the air flow direction.
The evaporator upstream discharge port 53 is provided upstream of the evaporator 30 in the air flow direction.

  The hoods 52f and 53f that guard the flow of the air discharged into the air flow path 11 are provided at the heater upstream discharge port 52 and the evaporator upstream discharge port 53, respectively.

  An inlet door (air discharge port) 54, a heater outlet door (air discharge port) 55, and an evaporator outlet door (air discharge port) are provided for the air intake port 51, the heater upstream discharge port 52, and the evaporator upstream discharge port 53, respectively. Reference numeral 56 is provided so as to be opened and closed. The entrance door 54 opens and closes to interrupt the intake of air from the air intake port 51 to the air circulation path 50. The heater outlet door 55 opens and closes to interrupt the discharge of air from the heater upstream-side discharge port 52 to the air flow path 11. The evaporator outlet door 56 opens and closes to interrupt the discharge of air from the evaporator upstream discharge port 53 to the air flow path unit 11.

The entrance door 54, the heater exit door 55, and the evaporator exit door 56 interrupt the discharge of air to the upstream side of the heater core 40. Specifically, as shown in FIG. 2, when the entrance door 54 and the heater exit door 55 are opened, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake 51. The ink is discharged from the heater upstream discharge port 52 to the upstream side of the heater core 40. The discharged air is further heated by passing through the heater core 40.
As shown in FIG. 3, when the entrance door 54 and the evaporator exit door 56 are opened, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake port 51, and the evaporator upstream. It is discharged from the side discharge port 53 to the upstream side of the evaporator 30. The discharged air is dehumidified by passing through the evaporator 30, and is further heated by passing through the heater core 40.

  The control unit 60 controls the circulation of air in the air circulation path 50. The controller 60 circulates the air heated by the heater core 40 to the upstream side of the heater core 40 through the air circulation path 50 when performing the heating operation in a state where the outside air temperature is low and the temperature of the cooling water is low. For this reason, the control unit 60 controls, for example, the humidity inside the vehicle detected by the humidity sensor 61 provided on the inlet side of the air flow path unit 11, the outside air temperature obtained from the controller of the vehicle 1, the temperature inside the vehicle, and the cooling water temperature. Based on the above, control is performed according to the processing of a preset computer program. The control unit 60 controls operations of the duct 12 d of the outside air intake 12, the blower 20, the entrance door 54, the heater exit door 55, the evaporator exit door 56, the compressor 31 and the like.

Hereinafter, a control method of the vehicle air conditioning system 10 in the control unit 60 will be described.
The control unit 60 operates, for example, a “temperature sensation priority switch” provided in the vehicle 1 and the like, when the occupant requests that the warm air is quickly blown out from the outlet 14, or provided in the vehicle 1. The following control is executed, for example, when it is detected that the occupant's hand or the like is cold by a temperature detection sensor or the like. Of course, the control unit 60 may execute the same control in other cases. Further, a series of controls in the control unit 60 described below are repeatedly executed at predetermined time intervals.

  As shown in FIG. 4, the control unit 60 determines whether the temperature of the cooling water of the engine is equal to or higher than a predetermined temperature W1 (step S1). As a result, when the temperature of the cooling water is equal to or higher than W1 and is sufficiently warm, the normal operation is performed (step S2). In the normal operation, the entrance door 54, the heater exit door 55, and the evaporator exit door 56 are all closed, and the air in the air flow path 11 does not flow into the air circulation path 50. If the cooling water is sufficiently warm, the air flowing through the air flow path 11 is sufficiently heated by the heater core 40 and then blown out of the outlet 14 into the vehicle interior space 3.

  If the temperature of the cooling water is lower than W1 in step S1, the control unit 60 determines whether or not the outside air temperature is lower than a predetermined set value (temperature reference value) T1 (step S3). . As a result, if the outside air temperature is low, such as below T1, the control unit 60 closes the duct 12d of the outside air intake 12 and takes in the air in the vehicle interior space 3 only from the inside air intake 13. The mode is switched to the circulation mode (step S4).

  After switching to the inside air circulation mode, the control unit 60 determines whether or not the humidity of the air in the vehicle interior space 3 detected by the humidity sensor 61 is equal to or higher than a predetermined humidity reference value H (step S5). As a result, when the humidity is lower than the humidity reference value H and the humidity is low, the process proceeds to the inside air circulation operation S10. In the inside air circulation operation S10, after the air in the vehicle interior space 3 taken in from the vehicle interior space 3 is heated by the heater core 40, a part of the air is taken into the air circulation path 50 and circulated upstream of the heater core 40.

  As shown in FIG. 5, in the inside air circulation operation S10, first, the control unit 60 determines whether or not the temperature of the engine coolant is lower than a predetermined temperature (liquid medium temperature reference value) W2 (W2 <W1). Is determined (step S11). In step S11, when the temperature of the cooling water is lower than W2, the outside air temperature is also lower than 0 ° C., and the temperature of the cooling water is extremely low. In such a state, even if air is passed through the heater core 40, the air is hardly heated. Therefore, the control unit 60 stops the operation of the blower 20, sets the air volume in the air flow path unit 11 to zero (0), and closes all of the entrance door 54, the heater exit door 55, and the evaporator exit door 56 (Step S12). . This suppresses blowing of low-temperature air from the outlet 14 into the vehicle interior space 3.

If the temperature of the cooling water is equal to or higher than W2 in step S11, the control unit 60 determines whether the temperature of the cooling water of the engine is lower than a predetermined temperature W3 (W3> W2) (step S13). ). As a result, when the temperature of the cooling water is less than W3 (that is, not less than W2 and less than W3), the blower 20 is operated and, as shown in FIG. 2, the inlet door 54 and the heater outlet door 55 are opened (step S14). ). Then, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake port 51 and discharged from the heater upstream discharge port 52 to the upstream side of the heater core 40. The discharged air is further heated by passing through the heater core 40.
At this time, when three levels of “small”, “medium”, and “large” are set, for example, the air volume by the blower 20 is set to “medium”. At this time, the amount of air flow by the blower 20 is set one step higher than when air is not taken into the air circulation path 50. This compensates for a decrease in the amount of air blown into the vehicle interior space 3 from the outlet 14 by taking air into the air circulation path 50.

  If the temperature of the cooling water is equal to or higher than W3 in step S13, the temperature of the cooling water is relatively high, equal to or higher than W3 and lower than W1. In this case, the blower 20 is operated to increase the amount of air flow (the amount of air is “large”) from the time of step S14, and also, as shown in FIG. 2, the inlet door 54 and the heater outlet door 55 are opened (step S15). ). Then, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake port 51 and discharged from the heater upstream discharge port 52 to the upstream side of the heater core 40. The discharged air is further heated by passing through the heater core 40.

  In addition, when the detected humidity of the in-vehicle space 3 is in the high humidity state equal to or higher than the humidity reference value H in step S5 in FIG. In the dehumidifying circulation operation S20, the air that has passed through the heater core 40 is taken into the air circulation path 50 and circulated upstream of the evaporator 30.

As shown in FIG. 6, in the dehumidifying and circulating operation S20, the control unit 60 operates the compressor 31 to flow the refrigerant to the evaporator 30 (Step S21).
Next, the control unit 60 determines whether the temperature of the cooling water of the engine is equal to or higher than the predetermined temperature W2 and lower than W3 (step S22). In step S22, when the temperature of the cooling water is not less than W2 and less than W3, the blower 20 is operated (the air volume is “medium”), and the entrance door 54 and the evaporator exit door 56 are opened as shown in FIG. Step S23). Then, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake port 51 and discharged from the evaporator exit door 56 to the upstream side of the evaporator 30. The discharged air is dehumidified by passing through the evaporator 30, and is further heated by passing through the heater core 40.

  If the temperature of the cooling water is not at least W2 and less than W3 in step S22, the temperature of the cooling water is relatively high at W3 or more and less than W1. In this case, the blower 20 is actuated to increase the air flow rate from the time of step S23 (air flow “large”), and as shown in FIG. 3, the entrance door 54 and the evaporator exit door 56 are opened (step S25). . Then, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake port 51 and discharged from the evaporator exit door 56 to the upstream side of the evaporator 30. The discharged air is dehumidified by passing through the evaporator 30, and is further heated by passing through the heater core 40.

  When the outside air temperature is equal to or higher than the predetermined set value T1 in step S3 of FIG. 4, the control unit 60 determines whether the outside air temperature is lower than the predetermined set value T2 (T2> T1). Is determined (step S6). As a result, if the outside air temperature is relatively low, that is, less than T2, the controller 60 opens the duct 12d of the outside air intake 12 and takes in air from the outside air intake 12, as shown in FIG. The mode is switched to the outside air introduction mode (step S7). Next, the control unit 60 proceeds to the outside air circulation operation S30. In the outside air circulation operation S30, after the air in the outside space 2 taken from outside the vehicle is heated by the heater core 40, a part of the air is taken into the air circulation path 50 and circulated upstream of the heater core 40.

  As shown in FIG. 8, in the outside air circulation operation S30, it is determined whether or not the temperature of the cooling water of the engine is lower than a predetermined temperature W3 (step S31). In step S31, when the temperature of the cooling water is lower than W3, the blower 20 is operated (the air volume is “medium”), and the entrance door 54 and the heater exit door 55 are opened as shown in FIG. 7 (step S32). ). Then, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake port 51 and discharged from the heater outlet door 55 to the upstream side of the heater core 40. The discharged air is further heated by passing through the heater core 40.

  If the temperature of the cooling water is not less than W3 in step S31, the temperature of the cooling water is relatively high, that is, W3 or more and less than W1. In this case, the blower 20 is operated to increase the amount of air flow (the amount of air is "large") from the time of step S32, and the inlet door 54 and the heater outlet door 55 are opened as shown in FIG. 7 (step S33). . Then, a part of the air heated by the heater core 40 is taken into the air circulation path 50 from the air intake port 51 and discharged from the heater outlet door 55 to the upstream side of the heater core 40. The discharged air is further heated by passing through the heater core 40.

  If the outside air temperature is equal to or higher than the predetermined set value T2 in step S6 in FIG. 4, the operation shifts to the normal operation similar to step S2 (step S8).

  Table 1 shows the state of each unit under the control of the control unit 60 as described above.

The air conditioning system 10 for a vehicle as described above includes an air passage 11 through which air supplied to the interior space 3 flows, a blower 20 provided in the air passage 11 and sending air to the interior space 3, A heater core 40 provided in the air flow path 11 to heat air using a liquid medium used in the vehicle 1 as a heat source, an outlet 14 for blowing air passing through the heater core 40 into the vehicle interior space 3, An air intake 51 is provided on the downstream side in the flow direction and takes in a part of the air that has passed through the heater core 40 from the air flow path portion 11. The air intake 51 is provided on the upstream side of the heater core 40 in the air flow direction. An air circulation path 50 having a heater upstream discharge port 52 for discharging air taken in from the air passage section 11 to the air flow path section 11 and an evaporator upstream discharge port 53.
According to such an air conditioning system 10 for a vehicle, a part of the air that has passed through the heater core 40 is taken into the air circulation path 50 through the air intake port 51 from the air flow path 11. The taken-in air is discharged from the heater upstream discharge port 52 and the evaporator upstream discharge port 53 provided on the upstream side of the heater core 40 to the air flow path 11. As a result, the air heated through the heater core 40 is supplied to the upstream side of the heater core 40 via the air circulation path 50, and the air temperature at the inlet of the heater core 40 increases. When this air is heated by the heater core 40, the air temperature at the outlet of the heater core 40 also increases. As a result, the temperature of the air blown from the air outlet 14 into the vehicle interior space 3 through the heater core 40 increases efficiently. Therefore, even when the outside air temperature is low, it is possible to efficiently perform the heating operation and enhance the comfort of the occupant.

Further, the heater upstream discharge port 52 and the evaporator upstream discharge port 53 are provided downstream of the blower 20 in the air flow direction.
According to such a configuration, air can be discharged from the heater upstream discharge port 52 and the evaporator upstream discharge port 53 at a position downstream of the blower 20 and closer to the heater core 40. Thereby, the air discharged from the heater upstream discharge port 52 and the evaporator upstream discharge port 53 reaches the heater core 40 without passing through the blower 20. Therefore, it is possible to suppress the temperature of the air discharged from the heater upstream discharge port 52 and the evaporator upstream discharge port 53 via the heater core 40 from decreasing before reaching the heater core 40. This makes it possible to efficiently perform the heating operation and enhance the comfort of the occupant.

The evaporator 30 further includes an evaporator 30 that is provided upstream of the heater core 40 in the air flow direction and that dehumidifies the air in the air flow path unit 11. The heater upstream discharge port 52 is connected to the evaporator 30 in the air flow direction. It is provided between the heater core 40.
According to such a configuration, air can be discharged from the heater upstream discharge port 52 at a position downstream of the evaporator 30 and closer to the heater core 40. Thereby, the air discharged from the heater upstream discharge port 52 reaches the heater core 40 without passing through the evaporator 30. Therefore, it is possible to prevent the temperature of the air discharged from the heater upstream-side discharge port 52 via the heater core 40 from decreasing before reaching the heater core 40. This makes it possible to efficiently perform the heating operation and enhance the comfort of the occupant.

Further, the evaporator upstream discharge port 53 is provided upstream of the evaporator 30 in the air flow direction.
According to such a configuration, the air heated via the heater core 40 is supplied to the upstream side of the evaporator 30 via the air circulation path 50. When this air passes through the evaporator 30, the air supplied to the vehicle interior space 3 is dehumidified. As a result, the fogging of the window can be suppressed, and the comfort of the occupant can be increased.

The vehicle air conditioning system 10 is provided with an air intake port 51, a heater upstream discharge port 52, and an evaporator upstream discharge port 53, and an entrance door 54 that intermittently discharges air to the upstream side of the heater core 40. , A heater exit door 55, an evaporator exit door 56, and a control unit 60 for controlling the entrance door 54, the heater exit door 55, and the evaporator exit door 56.
According to such a configuration, the control unit 60 controls the entrance door 54, the heater exit door 55, and the evaporator exit door 56 based on various conditions, thereby efficiently heating even when the outside air temperature is low. It becomes possible to appropriately increase the comfort of the occupant by driving.

Further, when the outside air temperature is lower than the predetermined set value T2, the control unit 60 opens the heater outlet door 55 or the evaporator outlet door 56, and discharges air to the upstream side of the heater core 40 through the air circulation path 50.
According to such a configuration, when the outside air temperature is lower than the set value T2, the air heated via the heater core 40 can be automatically circulated to the upstream side of the heater core 40 through the air circulation path 50. .

Further, when the humidity of the air is higher than a predetermined humidity reference value H, the control unit 60 opens the evaporator outlet door 56 and discharges the air upstream of the evaporator 30 for dehumidifying the air.
According to such a configuration, when the humidity of the air is higher than the humidity reference value H, the air heated through the heater core 40 passes through the evaporator 30 to automatically dehumidify the air supplied to the vehicle interior space 3. Can be done

The controller 60 stops the operation of the blower 20 when the temperature of the cooling water is lower than a predetermined temperature W2.
According to such a configuration, in a state where the temperature of the cooling water is excessively low, even if the air passes through the heater core 40, the air is not sufficiently heated. In such a case, if the blower 20 is operated to supply air from the air outlet 14 to the interior space 3, the temperature of the interior space 3 may decrease. Therefore, in such a state, the operation of the blower 20 is stopped, so that a decrease in the temperature of the interior space 3 can be suppressed.

Further, the control unit 60 increases the amount of air in the blower 20 when discharging air into the air flow path unit 11 through the air circulation path 50.
According to such a configuration, when a part of the air that has passed through the heater core 40 passes through the air circulation path 50, compared to a case where a part of the air does not pass through the air circulation path 50, the air flows from the outlet 14 to the vehicle interior section. The volume of the blown air is reduced. On the other hand, by increasing the air volume of the air in the blower 20, the air volume can be supplemented.

  In the above embodiment, the flow of control in the control unit 60 and the numerical values serving as various criteria are illustrated, but the order of processing, the numerical values, and the like may be appropriately changed. Further, according to various conditions such as humidity, outside temperature, inside temperature, and cooling water temperature, the air volume of the blower 20, the entrance door 54 of the air circulation path 50, the heater exit door 55, the evaporator exit door 56, the compressor 31, etc. May be set other than the above.

In the above-described embodiment, the heater upstream-side discharge port 52 and the evaporator upstream-side discharge port 53 are provided, but only one of them may be provided.
Further, the hoods 52f and 53f are provided in the heater upstream discharge port 52 and the evaporator upstream discharge port 53, however, the air is introduced into the air flow path 11 from the heater upstream discharge port 52 and the evaporator upstream discharge port 53. For example, a fan or the like may be provided as long as it can be discharged efficiently.

  Further, in the above-described embodiment, the cooling water of the engine of the vehicle 1 is used as the heat source of the heater core 40. However, other cooling water may be used.

DESCRIPTION OF SYMBOLS 1 Vehicle 3 Interior space 10 Air conditioning system 11 for vehicles Air flow path part 14 Outlet 20 Blower 30 Evaporator (dehumidifying part)
40 heater core (heat exchanger)
50 Air circulation path 51 Air intake 52 Heater upstream discharge port (air discharge port)
53 Evaporator upstream discharge port (air discharge port)
54 Entrance door (channel opening / closing part)
55 Heater exit door (channel opening / closing part)
56 Evaporator exit door (channel opening / closing part)
60 Control unit H Humidity reference value T1 Set value (Temperature reference value)
W2 Temperature (Liquid medium temperature reference value)

Claims (9)

An air flow path through which air supplied to the vehicle interior space flows;
A blower that is provided in the air passage portion and sends air to a vehicle interior space;
A heat exchanger provided in the air flow path portion and heating the air using a liquid medium used in a vehicle as a heat source,
An outlet for blowing the air that has passed through the heat exchanger into the vehicle interior space,
An air inlet provided downstream of the heat exchanger in the direction of flow of the air to take in a portion of the air that has passed through the heat exchanger from the air flow path portion, and the air that is higher than the heat exchanger. An air circulation path provided on the upstream side in the flow direction and having an air discharge port for discharging the air taken in from the air intake port to the air flow path portion,
An air conditioning system for a vehicle, comprising:   The air conditioning system for a vehicle according to claim 1, wherein the air discharge port is provided downstream of the blower in a flow direction of the air. A dehumidifying unit that is provided on the upstream side of the heat exchanger in the flow direction of the air in the air flow path unit and dehumidifies the air,
The air conditioning system for a vehicle according to claim 1, wherein the air discharge port is provided between the dehumidifying unit and the heat exchanger in a flow direction of the air.   The vehicle air conditioning system according to claim 3, wherein the air discharge port is provided on an upstream side of the dehumidifying unit in a flow direction of the air. A flow path opening / closing unit provided at at least one of the air intake port and the air discharge port, for intermittently discharging the air to the upstream side of the heat exchanger;
A control unit for controlling the flow channel opening and closing unit,
The air conditioning system for a vehicle according to any one of claims 1 to 4, further comprising:   The controller, when the outside air temperature is lower than a predetermined temperature reference value, opens the flow path opening and closing section, and discharges the air to the upstream side of the heat exchanger through the air circulation path. The vehicle air conditioning system according to claim 5, wherein   When the humidity of the air is higher than a predetermined humidity reference value, the control unit opens the flow path opening / closing unit and discharges the air upstream of a dehumidifying unit that dehumidifies the air. The vehicle air conditioning system according to claim 5 or 6, wherein   The said control part stops operation | movement of the said blower, when the temperature of the said liquid medium is lower than a predetermined liquid medium temperature reference value, The Claims any one of Claim 5 to 7 characterized by the above-mentioned. Air conditioning system for vehicles.   The said control part increases the air volume of the said air in the said blower, when discharging the air into the said air flow path part through the said air circulation path, The Claims any one of Claim 5 to 8 characterized by the above-mentioned. Air conditioning system for vehicles.

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