JP5240564B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to a vehicle air conditioner in which a heater core can be used as an auxiliary radiator for engine coolant.

  Patent Document 1 discloses a technique in which a heater core of a vehicle air conditioner is also used as an auxiliary radiator in order to reduce the size of an engine cooling system. In this Patent Document 1, cooling water is cooled by guiding outside air through the heater core to the outside of the passenger compartment and exchanging heat between the cooling water of the engine circulating through the heater core and the outside air.

JP 2004-211643 A

  In the case of the engine cooling system disclosed in Patent Document 1, in the operation mode in which the engine coolant is circulated through the heater core to cool the engine cooling system, it is basically impossible to simultaneously perform the cooling operation in the passenger compartment.

  An object of the present invention is to provide a vehicle air conditioner in which a heater core can be used as an auxiliary radiator for engine coolant even during cooling operation.

An air conditioning apparatus for a vehicle according to the present invention includes an air conditioning duct having an air introduction port on one end side and an air blowing port on the other end side, a heater core that is housed in the air conditioning duct and in which engine cooling water circulates, A vehicle air conditioner having a heating duct that divides the air conditioning duct so as to surround the heater core, and communicates with the air conditioning duct separately from the air introduction port to allow outside air to flow into the air conditioning duct. An outside air introduction port that leads, an exhaust port that communicates with the air conditioning duct and exhausts outside air led from the outside air introduction port to the air conditioning duct, and a first opening and closing for opening and closing the outside air introduction port a damper, and a second switching damper for opening and closing the heating duct, and a third opening and closing the damper for opening and closing the exhaust port, these first and second And a control means comprise for controlling the opening and closing of the third opening and closing the damper, the control means, the said outside air introduction port and the heating duct and holding the exhaust port to an open state, the outside air from the outside air introduction port In the first mode for guiding the outside air that has passed through the heater core to the exhaust port, the outside air introduction port, the heating duct, and the exhaust port are kept closed, and the air A second mode for guiding the air from the introduction port to the air blowing port without passing through the heating duct; the outside air introduction port and the exhaust port are closed; and the heating duct is kept open; wherein the first and second and a third mode which leads to the air outlet port through said heater core air from the air inlet port from the heating duct Allow der switched open and closed positions of the opening and closing damper 3 is, the in the first mode, wherein with the first and third opening and closing the damper is switched to the respective open position the second closing damper of the first opening and closing damper In the second mode, all of the first, second and third open / close dampers are switched to the closed position, and in the third mode, the first and third in is the closing damper and the second opening and closing dampers with each switched to the closed position those characterized by Rukoto is switched to the second open position so as to close the portion of the air-conditioning duct partitioned by the heating duct is there.

  In the present invention, when the first mode is selected, the engine coolant led to the heater core is cooled by the outside air from the outside air introduction port, and the warmed outside air is discharged from the exhaust port to the outside of the vehicle. . When the vehicle interior is cooled, the first mode or the second mode is selected. In addition, when heating the passenger compartment, the third mode is selected.

  The vehicle air conditioner according to the present invention may further include an evaporator that is accommodated in an air conditioning duct between the air introduction port and the outside air introduction port and in which the refrigerant circulates.

  A blower for guiding the outside air from the outside air introduction port to the air conditioning duct in conjunction with opening and closing of the outside air introduction port may be further provided.

  Means for determining the driving state of the vehicle may further be provided, and the control means may select the first mode when the driving state of the vehicle is a predetermined driving state set in advance. In this case, the driving state of the vehicle can include the engine speed, the vehicle speed, the outside air temperature, and the engine load.

According to the vehicle air conditioner of the present invention, the outside air from the outside air introduction port is led to the heating duct, and the outside air that has passed through the heater core is led to the exhaust port, so that the heat radiation by the radiator is particularly severe in summer. during high-load low-speed operation, lead to cooling water of the engine to the heater core, by utilizing it as an auxiliary radiator, Ru can increase the cooling capacity of the engine. In this case, since the high-temperature outside air that has passed through the heater core is discharged outside the vehicle, it is possible to avoid an adverse effect on cooling in the vehicle interior.

  In conjunction with opening and closing of the outside air introduction port, when a blower for guiding outside air from the outside air introduction port to the air conditioning duct is further provided, the capacity of the auxiliary radiator in the first mode can be enhanced.

  Means for determining the driving state of the vehicle is further provided, and the control means is configured to select the first mode when the driving state of the vehicle is a predetermined driving state set in advance. The heater core can be used as an auxiliary radiator during high load and low vehicle speed operation.

  An embodiment of an air conditioner for a vehicle according to the present invention will be described in detail with reference to FIGS. 1 to 6. However, the present invention is not limited to such an embodiment, and the spirit of the present invention is as necessary. It can also be applied to any other technique belonging to.

  A vehicle air conditioner according to this embodiment is schematically shown in FIG. 1, which represents a cooling operation state that is the second mode. An engine cooling system is attached to the engine 10 arranged outside the passenger compartment. The engine cooling system includes a radiator 11, a cooling fan 12, a cooling water circulation pump 13, a thermostat 14, and a bypass passage 15. The radiator 11 forms a cooling water circulation passage 17 between the engine 10 such that cooling water from the engine 10 side passes through the radiator 11 via a branch valve 16 described later and returns to the engine 10 via the thermostat 14. The bypass passage 15 is connected to the branch valve 16 and the thermostat 14. When the temperature of the cooling water is low, the thermostat 14 closes the cooling water circulation passage 17. Therefore, the cooling water circulating pump 13 that operates in conjunction with the engine 10 causes the cooling water to pass from the branch valve 16 through the bypass passage 15, return from the thermostat 14 to the engine 10, and does not flow to the radiator 11 side. The temperature of the cooling water rises, the thermostat 14 opens the cooling water circulation passage 17 and closes the bypass passage 15, and the cooling water defines a flow that returns from the branch valve 16 to the engine 10 through the radiator 11. When the temperature of the cooling water further rises, the cooling fan 12 starts to rotate, and the cooling efficiency of the cooling water by the radiator 11 is increased.

On the other hand, the air conditioning apparatus of this embodiment, part and partial and control equipment (not shown) for controlling the piping and of actuation to connect these to be disposed outside the vehicle compartment which is arranged in the vehicle compartment side It is configured in such a throat capital.

Portion that is disposed in the vehicle compartment side, the air-conditioning duct 1 8, a heater core 19, and the heating duct 2 0, and the outside air introduction port 2 1 a, and the exhaust port 2 2 a, and an evaporator 2 3, outside air And opening / closing means for opening and closing the introduction port 2 1 a, the heating duct 2 0 , the exhaust port 2 2 a, and the like. The air conditioning duct 18 has an air introduction port 1 8 a on one end side and an air blowing port 1 8 b on the other end side, and a plurality of air blowing ports 1 8 b are formed and open to the interior of the vehicle, respectively. . Air inlet port 1 8 a is the outside air introduction duct 2 4 for introducing outside air, communicates with the room air intake duct 2 5 for circulating the cabin air. The heater core 19 is accommodated in the air conditioning duct 18 so that the cooling water of the engine 10 described above circulates. This portion will be described later. Heating duct 2 0, separating the air-conditioning duct 1 8 so as to surround the heater core 19. Outside air introduction port 2 1 a is for guiding the outside air in communication with separate air-conditioning duct 1 8 and air inlet port 1 8 a of the air-conditioning duct 1 8 the air-conditioning duct 1 8, the second It is formed at the end of the outside air inlet duct 2 1. Exhaust ports 2 2 a has a function to discharge the outside air guided from the outside air inlet port 2 1 a in the air-conditioning duct 1 8 communicates with the air-conditioning duct 1 8 to the outside of the vehicle, the base end of the exhaust duct 2 2 Is formed. Evaporator 2 3 is accommodated in the air-conditioning duct 1 in 8 between the air inlet port 1 8 a and the outside air inlet port 2 1 a, although the refrigerant is circulated, this part will be described later. Opening and closing means includes a first opening and closing damper 2 6, the second switching damper 2 7, and the third opening and closing the damper 2 8, and the mixing damper 29, closing and mixing damper 29 of opening and closing the damper 2 6-2 8 Actuators (not shown) for performing the position control of each. The first opening / closing damper 26 is for opening and closing the outside air introduction port 2 1 a. Second switching damper 2 7 is for opening and closing the heating duct 2 0, it can be switched between a closed position, a first open position, and a second open position. If the second on-off damper 2 7 is in the closed position, a state of the heating duct 2 0 is blocked. The first open position achieves the first mode shown in FIG. 4, that is, the operating state in which the coolant of the engine 10 is led from the branch valve 16 to the heater core 19 and the heater core 19 is used as an auxiliary radiator. In the first mode, the cooling operation can be performed simultaneously. The second open position achieves the third mode shown in FIG. 6, that is, the heating operation state. The third opening and closing the damper 2 8 is for opening and closing the exhaust port 2 2 a, the heating duct 2 0 open exhaust port 2 2 a in the case of the first mode and the exhaust port 2 2 a In the case of the second and third modes other than that, the exhaust port 2 2 a is closed. Mixing damper 29 is disposed straddling the outside air inlet duct 2 4 and the indoor air suction duct 2 5, mixed with the cabin air from the outside air and the indoor air suction duct 2 5 from the outside air introduction duct 2 4 It is for adjusting the ratio. Actuator, but is intended for opening and closing operation and the position adjustment of the mixing damper 29 of these opening and closing dampers, the position of the mixing dampers 29 occupant may be directly adjusted manually.

The air-conditioning duct 1 in 8 between the air inlet port 1 8 a and evaporator 2 3, and the air conditioning blower 3 0 for feeding air from the air inlet port 1 8 a to an evaporator 2 3 side is incorporated Yes. Further, in the middle of the second outside air introduction duct 2 1 defining a outside air introduction port 2 1 a is linked to the opening and closing operations of the outside air introduction port 2 1 a, ducts for air conditioning outside air from the outside air inlet port 2 1 a cooling blower 3 1 for directing to 1 8 is incorporated.

Portion that is disposed outside the vehicle compartment, the evaporator and the condenser 3 3 defining a coolant circulation passage 3 2 between the 2 3, the middle of the coolant circulation passage 3 2 for connecting the condenser 3 3 and evaporator 2 3 a compressor 3 4 incorporated in, and a refrigerant circulating pump 35 for built in the middle of the coolant circulation passage 3 2 circulates the coolant. The heater core 19 is connected to one branch valve 16 of the second cooling water circulation passage 3 6, the other of the second cooling water circulation passage 3 6 communicates with the thermostat 14. Previous branch valve 16 is provided for opening and closing the second cooling water circulation passage 3 6, when the vehicle is in a predetermined operating condition, the engine 10 to the cooling water by opening the second cooling water circulation passage 3 6 Circulation is performed between the heater cores 19 .

Control equipment as a controller according to the present invention includes a first mode closing and opening means preceding the branch valve 16, and the second mode, the air conditioning blower with switching to a third mode 3 0 and the cooling fan 3 1 and is for controlling the operation of such a refrigerant circulation pump 35. The first mode is to hold the outside air introduction port 2 1 a and the heating duct 2 0 and exhaust ports 2 2 a in an open state, leads to the outside air from the outside air introduction port 2 1 a in the heating duct 2 0, the heater In this mode, the outside air that has passed through the core 19 is guided to the exhaust port 2 2 a and the heater core 19 is used as an auxiliary radiator. In this case, since the air from the air inlet port 1 8 a can be derived without passing through the heating duct 2 0 to the air blowout port 1 8 b, it is also possible to perform the cooling operation at the same time. The second mode, holds the outside air introduction port 2 1 a and the heating duct 2 0 and exhaust ports 2 2 a closed, and the air from the air inlet port 1 8 a to the air blowout port 1 8 b heating leads without passing through the use duct 2 0 is the cooling operation mode. Note that unlike the previous first mode, the heater core 19 cannot be used as an auxiliary radiator in this second mode. The third mode, the outside air introduction port 2 1 a and the exhaust port 2 2 a holding the closed state and the heating duct 2 0 opened, the air from the air inlet port 1 8 a from the heating duct 2 0 This is a heating operation mode that leads to the air blowing port 1 8 b through the heater core 19 .

In order to determine the selection of the first mode described above based on the driving state of the vehicle, in the present embodiment, based on the engine speed, the vehicle speed, the outside air temperature, and the load of the engine 10, these are based on preset threshold values. control means when even larger so that the first mode is performed, controls the opening and closing of the cooling fan 3 1 of the working and the branch valve 16 controls the operation of the switching means. Therefore not shown engine speed sensor and a vehicle speed sensor, an outside air temperature sensor is assembled in the vehicle, an engine load calculation unit (not shown) is incorporated in the control equipment. Also shows the map as shown in FIG. 2 which represents the relationship between the vehicle speed and the outside air temperature and the auxiliary cooling region to the control equipment, Figure 3 showing the relationship between the load and the auxiliary cooling area of the engine speed and the engine 10 Such a map is stored. The auxiliary cooling region in FIGS. 2 and 3 is a region where the heater core 19 should be used as an auxiliary radiator. When all of these conditions are satisfied and the cooling operation state is set, the first mode is selected.

When the first mode is selected, the first on-off damper 2 6 is held open, the second on-off damper 2 7 is held in the first open position, the third opening and closing the damper 2 8 is opened Kept in a state. The branch valve 16 with the cooling fan 3 1 is operated to open the cooling water piping, cooling water from the engine 10 is also supplied to the heater core 19 in addition to the radiator 11. The selection procedure of the first mode will be described based on the flowchart shown in FIG. 5. First, in step S11, it is determined whether or not the air conditioner is in the cooling operation mode, that is, the second mode is selected. . If it is determined that the cooling operation is being performed, it is determined in step S12 whether or not the driving state of the vehicle is in an auxiliary cooling region as shown in FIGS. Here, if the vehicle is determined to be in the auxiliary cooling region, the first mode is selected and proceeds to S13 in step, the second cooling water circulation passage is more branch valve 16 is opened to the control equipment 3 6 open. As a result, a circulating flow of cooling water from the engine 10 through the heater core 19 via the branch valve 16 and returning from the thermostat 14 to the engine 10 is formed. At the same time, open the outside air introduction port 2 1 a first opening and closing damper 2 6 More control equipment is in the open, the second on-off damper 2 7 is driven in a first open position, the third opening and closing dampers 2 8 in the open open exhaust port 2 2 a, further cooling blower 3 1 is driven. As a result, the outside air from the outside air inlet port 2 1 a is led to the heating duct 2 0 performs heat exchange between the cooling water passes through the heater core 19, the engine 10 is cooling water cooled by the outside air Back to the side. At the same time, the high temperature outside air is discharged from the exhaust port 2 2a to the outside of the vehicle. Thus, even during the cooling operation, the heater core 19 can be used as an auxiliary radiator, and the cooling efficiency of the cooling water of the engine 10 can be improved.

  On the other hand, if it is determined in step S11 that the air conditioner is not in cooling operation, or if it is determined in step S12 that the driving state of the vehicle is not in the auxiliary cooling region, the first mode is selected. Not done.

  It should be noted that the present invention should be construed only from the matters described in the claims, and in the above-described embodiment, all the changes and modifications included in the concept of the present invention are other than those described. Is possible. That is, all matters in the above-described embodiment are not intended to limit the present invention, and include any configuration not directly related to the present invention. To get.

It is a key map showing typically one embodiment of the air harmony device for vehicles by the present invention, and shows the air conditioning operation state which is the 2nd mode. In the embodiment shown in FIG. 1, it is a map showing the relationship between a vehicle speed, external temperature, and an auxiliary | assistant cooling use area | region. In the embodiment shown in FIG. 1, it is a map showing the relationship between an engine speed, an engine load, and an auxiliary cooling use area. It is a conceptual diagram which shows the use condition at the time of selecting 1st mode in the air_conditionaing | cooling operation of embodiment shown in FIG. It is a flowchart showing the selection procedure of the 1st mode in embodiment shown in FIG. In embodiment shown in FIG. 1, it is a conceptual diagram which shows the heating operation state which is a 3rd mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Engine 11 Radiator 12 Cooling fan 13 Cooling water circulation pump 14 Thermostat 15 Bypass passage 16 Branch valve 17 Cooling water circulation passage 1 8 Air-conditioning duct 1 8 a Air introduction port 1 8 b Air blowing port
19 heater cores 2 0 heating duct 2 1 second outside air introduction duct 2 1 a outside air inlet port 2 second exhaust duct 2 2 a discharge port 2 3 evaporator 2 4 outside air inlet duct 2 5 room air intake duct 2 6 first Opening and closing damper 2 7 Second opening and closing damper 2 8 Third opening and closing damper
29 mixing damper 3 0 air blower 3 1 cooling blower 3 2 refrigerant circulation passage 3 3 condenser 3 4 compressor 3 5 refrigerant circulation pump 3 6 second cooling water circulation passage

Claims (3)

An air conditioning duct having an air introduction port on one end side and an air outlet port on the other end side, a heater core accommodated in the air conditioning duct and circulating the cooling water of the engine, and the air conditioning duct surrounding the heater core A vehicle air conditioner having a heating duct that partitions the duct,
An outside air introduction port that communicates with the air conditioning duct separately from the air introduction port and guides outside air to the air conditioning duct;
An exhaust port communicating with the air conditioning duct and exhausting the outside air led from the outside air introduction port to the air conditioning duct;
A first opening / closing damper for opening and closing the outside air introduction port ;
A second opening / closing damper for opening / closing the heating duct ;
A third opening / closing damper for opening / closing the exhaust port;
And control means for controlling the opening and closing of these first and second and third opening and closing the damper, the control means,
The outside air introduction port, the heating duct, and the exhaust port are kept open, the outside air from the outside air introduction port is led to the heating duct, and the outside air that has passed through the heater core is led to the exhaust port. The first mode;
A second mode in which the outside air introduction port, the heating duct and the exhaust port are held in a closed state, and the air from the air introduction port is guided to the air blowing port without passing through the heating duct;
The outside air introduction port and the exhaust port are closed and the heating duct is held in an open state, and air from the air introduction port is guided from the heating duct to the air blowing port through the heater core. allow der switched open and closed positions of said first and second and third opening and closing dampers in the mode is,
In the first mode, the first and third open / close dampers are each switched to an open position, and the second open / close damper is switched to a first open position connected to the first open / close damper,
In the second mode, the first, second and third open / close dampers are all switched to the closed position,
In the third mode, each of the first and third open / close dampers is switched to a closed position, and the second open / close damper is a second opening that blocks a portion of the air conditioning duct partitioned by the heating duct. the vehicle air conditioning apparatus according to claim Rukoto switched to position.   The vehicle air conditioner according to claim 1, further comprising a blower for guiding the outside air from the outside air introduction port to the air conditioning duct in conjunction with the opening / closing operation of the outside air introduction port. Further comprising means for determining an operating condition of the vehicle, wherein if the predetermined operating state the operating state of the vehicle is set in advance, according to claim 1, wherein the selecting the first mode or The vehicle air conditioner according to claim 2 .

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