JPH0565014A - Air-conditioning device for automobile - Google Patents

Abstract

(57) [Summary] [Purpose] In an automobile air conditioner, the cooling capacity due to the heat load immediately after the air conditioner is activated when there is a large amount of heat entering from the windshield due to insolation or when the vehicle is left in the hot sun in summer. The temperature inside the vehicle is improved, and comfortable temperature control in the passenger compartment can be performed even when cooling is started. [Structure] Doors 17, 18 and 19 for opening and closing the outside air introduction port 1 and the inside air introduction ports 2 and 3, and a return duct 16 communicating between the evaporator 6 and the defroster outlet 11 to the upstream side of the air introduction fan 4. A return door 27 that opens and closes this, a fan partition wall 33 that divides the air introduction fan 4 into two, and two air guide passages 28 that are located downstream of the air introduction chamber 5.
a partition wall 34 that is divided into a and 28b, and a baffle passage 28a
An exhaust duct 30 communicating with the outside of the vehicle compartment and an exhaust door 31 for opening and closing the exhaust duct 30 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reheat air mix type air conditioner for a vehicle, and more particularly to a vehicle air conditioner capable of improving a decrease in cooling ability at the time of cooling start and enabling a comfortable vehicle interior temperature control. Regarding the harmony device.

[0002]

2. Description of the Related Art A conventional reheat air mix type air conditioner for an automobile (hereinafter sometimes simply referred to as an air conditioner) is disclosed in Japanese Patent Laid-Open No. 63-188514, which has an outside air inlet port. An air guide duct extending from the air introduction fan provided in the vicinity of the air guide fan is provided, and a center vent outlet, a side vent outlet, and a defroster outlet opening in the instrument panel in the vehicle compartment are provided at the downstream end of the air duct. Further, a floor outlet is provided by branching at the downstream end of the wind guide duct. An evaporator and a heater core are provided in the middle of the air duct, and the air introduced from the outside air intake and the inside air intake is pressurized by an air introduction fan during cooling, and cooled by the evaporator to be supplied into the vehicle interior. Is becoming

In such a reheat air-mix type air conditioner for automobiles, for the purpose of solving the deterioration of the cooling capacity at the time of starting the cooling, for example, Japanese Patent Laid-Open No. Sho 6-96
The devices disclosed in Japanese Patent Application Laid-Open No. 3-265720 and Japanese Patent Application Laid-Open No. 1-240315 include means for forcibly discharging hot air in the air duct of the air conditioner to the outside of the vehicle compartment at the time of cooling activation.

Further, in the device disclosed in Japanese Patent Laid-Open No. 59-70219, the temperature difference between the air outside the vehicle compartment and the air inside the vehicle compartment is measured, and when it is determined that the air inside the vehicle interior is higher, the device is disclosed. It has means for increasing the cooling capacity of the above and performing rapid cooling.

[0005]

In recent automobiles, the window glass surface of the vehicle has become slanted, so that the window glass area has expanded and the amount of heat entering the vehicle interior due to solar radiation has also increased. In particular, the windshield has a strong tendency, and the temperature inside the windshield is 70 ℃ to 80 ℃ when the vehicle is left in the hot weather in the summer when the outside air temperature is high. Is one of the causes of decrease. Further, even when the vehicle is running, the air above the instrument panel and the inside of the windshield is heated, which causes the same problem.

[0006] In the above-mentioned prior art, although the amount of heat entering from the windshield directly affects the cooling capacity, the amount of entering heat is not eliminated. There was a problem of lowering it. That is, in the devices disclosed in JP-A-63-265720 and JP-A-1-240315, only the hot air inside the device is exhausted, so that the heat load due to the hot air inside the windshield is It is conceivable that the cooling capacity will decrease due to the increase. Further, in the device disclosed in Japanese Patent Laid-Open No. 59-70219, the limit of the cooling capacity of the device is not taken into consideration, and similarly to the above, it is conceivable that the cooling capacity is deteriorated by the hot air inside the windshield.

In view of the above problems, an object of the present invention is to improve the cooling capacity due to the heat load immediately after the air conditioner is activated when there is a large amount of heat entering from the windshield due to solar radiation or when the vehicle is left in the hot sun in summer. An object of the present invention is to provide an air conditioner for a vehicle that can improve the temperature drop and can control the temperature inside the vehicle in a comfortable manner even when the cooling is started.

[0008]

In order to solve the above problems, the present invention provides three types of vehicles: an air introduction fan provided in an air introduction chamber, a defroster outlet, a vent outlet, and a floor outlet. An indoor air outlet, an air guide duct that communicates with the vehicle interior air outlet from the air introduction fan, a cooling evaporator and a heating heater core installed in the middle of the air guide duct, and an upstream side of the heater core. In a reheat air mix type automobile air conditioner having an air mix door, a branch duct branched from an air guide duct between the evaporator and the defroster outlet, and a return duct connected to an upstream side of the air introduction fan. A return door installed in the return duct and normally closing the return duct; and an air guide provided in the air introduction fan. Two fans, a fan partition wall that divides the fan perpendicularly to its suction direction, and an air introduction fan that is provided on the downstream side of the air introduction fan in the air introduction chamber and has its downstream portion partitioned by the fan partition wall. A partition wall that divides into two air guide passages corresponding to a portion, an exhaust duct that branches from one of the two air guide passages on the downstream side of the air introduction fan and communicates with the outside of the vehicle compartment, and a branch portion of the exhaust duct. And an exhaust door that normally closes the exhaust duct.

Further, in the air introducing chamber, of the two fan portions of the air introducing fan divided by the fan partition wall, on the upstream side of the fan portion on the side corresponding to the air guide passage where the exhaust duct branches. An outside air inlet and a first inside air inlet, an outside air door for opening and closing them and a first inside air door are provided, and a second inside air inlet and a second inside air for opening and closing the other inside of the fan are provided upstream. A door may be provided.

Further, a first outlet temperature sensor provided at the defroster outlet, a second outlet temperature sensor provided at outlets other than the defroster outlet, and the first and second outlet temperatures. Control means for opening the return door and the exhaust door may be provided until the temperature difference by the sensor becomes within a predetermined temperature difference.

Further, the control means closes the first inside air door until the temperature difference between the first and second outlet temperature sensors is within a predetermined temperature difference, and the second inside air door and the inside air door are closed. It can be characterized by opening the return door.

[0012]

In the present invention, when the air conditioner is operated for rapid cooling, when the return door and the exhaust door are opened, the defroster outlet communicates with the upstream side of the air introduction fan and one of the downstream side of the air introduction fan. The air guide passage communicates with the outside of the vehicle compartment through the exhaust duct. At this time, the air introduction fan is divided perpendicularly to the suction direction by the fan partition wall, and the introduction passage on the downstream side of the air introduction fan is also divided by the partition wall correspondingly, so that the inside of the windshield and the instrument are installed. All hot air in the upper part of the ment panel is sucked into the upstream side of the air introduction fan from the defroster outlet through the return duct, and is further discharged to the outside of the vehicle compartment through the exhaust duct. In this way, by releasing the hot air that causes the reduction of the cooling capacity of the vehicle interior to the outside of the vehicle interior, the heat load is reduced, and the reduction of the cooling capacity can be prevented.

At this time, the outside air inlet is closed by the outside air door and the first inside air inlet is closed by the first inside air door. Therefore, the exhaust duct is located upstream of the defroster outlet from the air introduction fan. Only the air sucked in is exhausted, and other inside air and outside air do not mix. On the other hand, since the second inside air introduction port is opened by the second inside air door, the inside air other than the air sucked from the defroster outlet is sucked into the downstream side of the air introduction fan from the second air introduction port, and the air guide duct. After the temperature is adjusted by the evaporator or the heater core, it is blown out from the vehicle interior air outlet.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An automobile air conditioner according to an embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic diagram showing a configuration of an air conditioner for a vehicle according to an embodiment of the present invention, and is a diagram showing a cooling start time. In FIG. 1, an air introduction chamber 5 on the upstream side of the air conditioner is provided with an outside air introduction port 1 for introducing air outside the vehicle compartment and inside air introduction ports 2, 3 for introducing air inside the vehicle interior. An air introduction fan 4 is provided immediately downstream of 1 and the inside air introduction port 3. The inside air introduction port 3 is an air introduction fan 4
Is provided together with the outside air introduction port 1 on the upstream side on one side in the axial direction, and the inside air introduction port 2 is provided on the other side in the axial direction of the air introduction fan 4. An evaporator accommodating portion and a heater core accommodating portion are provided in the middle of the air guide duct 5a, of which an evaporator 6 for cooling is provided in the evaporator accommodating portion, and a heater core 7 for heating is provided in the heater core accommodating portion. Has been done. A defroster duct 8 and a floor duct 9 that communicate with the downstream side of the heater core housing portion are provided on the downstream side of the heater core 7, and a defroster outlet 11 that blows to the inner surface side of the windshield 10 is provided on the downstream side of the defroster duct 8. A floor outlet 12 is formed at the downstream end of the floor duct 9. Further, a vent outlet 14 that opens to the instrument panel 13 is formed via a vent duct 15 on the downstream side of the heater core accommodating portion. Further, a return duct 16 that branches in the middle of the defroster duct 8 is provided, and a return door 27 that opens and closes the exhaust passage 26 is provided near the branch portion.
Is provided. The return duct 16 communicates with a portion of the air introduction chamber 5 upstream of the air introduction fan 4 where the outside air introduction port 1 and the inside air introduction port 3 are located.

In order to control the flow of air in the air conditioner, the outside air inlet 1 is provided with an outside air door 17, the inside air inlet 2 is provided with an inside air door 18, and the inside air inlet 3 is provided with an inside air door 19. An air mix door (for vent) 20 and an air mix door (for floor) 21 are provided near the upstream side of the heater core 7. Further, a bypass door 22 that controls the air flow on the upper side (vent and defroster) and the lower side (floor) is provided on the downstream side of the heater core 7, and the defroster duct 8 that branches off from the air guide duct 5a on the downstream side of the heater core, A defroster door 23, a floor door 24, and vent doors 25a and 25b are provided on the upstream sides of the floor duct 9 and the vent duct 15, respectively.

Further, a fan partition wall 33 is provided in the air introducing fan 4 so as to be perpendicular to the suction direction, and the air introducing chamber 5 has a fan partition wall 33 downstream of the air introducing fan 4.
2 of the air introduction fan 4 divided by the fan partition 33
Two air guide passages 28a, 28 corresponding to one fan part
A partition wall 34 that divides into b is provided. In one of the air guide passages 28a on the downstream side of the air introducing fan 4, an exhaust duct 30 for guiding the air pressurized by the air introducing fan 4 to the outside 29 of the vehicle through the exhaust passage 26, and the exhaust duct 3
0 and the ventilation passage 47 on the upstream side of the evaporator 6 are provided with an exhaust door 31 that selectively switches between them. The other air guide passage 28b directly communicates with the evaporator 6 via the air passage 47. During normal operation, the return duct 16 is closed by the return door 27 and the exhaust duct 30 is closed by the exhaust door 31.

Next, the control system of the air conditioner will be described with reference to FIG. FIG. 2 is a control system diagram of the vehicle air conditioner according to this embodiment. The control unit 37 is connected to the control panel 38, and has a water temperature sensor 39, a solar radiation sensor 40, an outside air sensor 41, a foot vehicle sensor 42, a head vehicle sensor 43, a defroster outlet temperature sensor 44, a vent outlet temperature sensor 45, and a floor outlet temperature. Each sensor signal of the sensor 46 is input, arithmetic processing is performed including the command signal received from the temperature setting switch and the mode switch on the control panel 38, and each drive signal is output to each electric actuator. Also,
From the control unit 37, the motor 32 of the air introduction fan 4, the evaporator 6, the heater core 7 (see FIG.
A control signal is output by a control circuit (not shown).

The outside air door 17 and the inside air door 18 are provided with an electric actuator 35a, and the air mix doors 20 and 2 are provided.
1 is an electric actuator 35b and a defroster door 2
3 is an electric actuator 35c, the floor door 24,
The vent doors 25a and 25b and the bypass door 22 are configured to be driven by a link mechanism using an electric actuator 35d, respectively.
7, the inside air door 19, and the exhaust door 31 are configured to be driven by a link mechanism 36 using an electric actuator 35. These electric actuators are controlled by the control unit 37.

Next, the operation of this embodiment will be described. When traveling, the amount of heat entering from the windshield 10 due to insolation heats the inner surface of the windshield 10 and the upper air of the instrument panel 13 and causes a decrease in cooling capacity. In addition, when the vehicle is left in the hot sun when the outside temperature is high such as in summer, the temperature inside the vehicle becomes hot at 70 to 80 ° C, and even if the vehicle is rapidly cooled in this state, the heat load is large, so it is comfortable. It takes time to reach such a room temperature.

In order to solve this, when the heat load in the passenger compartment is large, the actuator 35 is controlled to operate the return door 27 provided near the connecting portion of the return duct 16 branched from the middle of the defroster duct 8. Then, the return duct 16 side is opened and the defroster outlet side is closed. In conjunction with the return door 27, the inside air door 19 is closed and the exhaust door 31 is opened. As a result, the heated air in the passenger compartment, particularly inside the windshield, is separated from the defroster outlet 11 by the air introduction fan 4 to the partition wall 33.
To the outside of the vehicle through the exhaust duct 30.
To discharge. On the other hand, the passenger compartment air sucked from the inside air introduction port 2 is pressurized by the air introduction fan 4, and the ventilation passage 47
It is cooled by the evaporator 6 and is supplied into the vehicle compartment from the vent outlet 14.

FIG. 3 is a schematic view of the structure of the vehicle air conditioner shown in FIG. 1, showing a normal operation after the interior of the vehicle is cooled to some extent. When the vehicle interior is cooled to some extent and the temperature difference input from the defroster outlet temperature sensor 44 and the vent outlet temperature sensor 45 falls within a predetermined temperature difference, the defroster outlet side opens and the return duct 16 side closes, as shown in FIG. Return door 2
7 is returned, and in conjunction with this, the inside air door 19 is opened,
The exhaust door 31 is closed. As a result, the air is not sucked from the defroster outlet, and the air sucked from the inside air inlet 3 is pressurized by the air inlet fan 4 together with the air sucked from the inside air inlet 2, cooled by the evaporator 6, and vented. It is supplied from the outlet 14 into the passenger compartment.

The control unit 37 shown in FIG. 2 constitutes a control means for controlling the above-mentioned control, and inputs the respective input values of the defroster blow-out temperature sensor 44 and the vent blow-out temperature sensor 45 which are inputted as control signals of the air conditioner. In comparison, when the temperature difference exceeds a predetermined value, the return door 27,
Operate the exhaust door 31 and the inside air door 19 as described above,
When the temperature difference is within a predetermined range, these doors are returned to their original positions.

According to this embodiment, when the cooling is started,
By controlling the return door 27, the inside air door 19 and the exhaust door 31 with the controller 37, all the hot air inside the windshield 10 and the upper part of the instrument panel 13 is sucked in from the defroster outlet 11, and the return duct 16 and the exhaust duct 30 are connected. Since the heat is discharged to the outside 29 of the vehicle via the heat exchanger, the heat load is reduced and the cooling capacity can be prevented from being lowered.

Although this control is a control in the vent mode (a mode in which cool air is blown out from the vent outlet 14), it is in a bi-level mode (a mode in which cool air is blown out from both the vent outlet 14 and the floor outlet 12). Can be controlled in the same way.

[0025]

According to the present invention, since the hot air in the vehicle compartment is discharged to the outside of the vehicle compartment when the cooling is started, the air when there is a large amount of heat entering through the windshield or when the vehicle is left in the hot sun in summer The reduction in the cooling capacity due to the heat load immediately after the operation of the air conditioner is improved, and the passenger compartment temperature can be comfortably controlled without causing discomfort to passengers.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a configuration of an air conditioner for a vehicle according to an embodiment of the present invention, which is a diagram illustrating a state when cooling is started.

FIG. 2 is a control system diagram of the vehicle air conditioner shown in FIG.

FIG. 3 is a view similar to FIG. 1, showing a normal operation.

[Explanation of symbols]

 1 Outside Air Inlet 2, 3 Inside Air Inlet 4 Air Inlet Fan 5 Air Inlet Chamber 5a Air Duct 6 Evaporator 7 Heater Core 11 Defroster Outlet 12 Foot Outlet 14 Vent Outlet 16 Return Duct 17 Outside Air Door 18, 19 Inside Air Door 20 , 21 Air mix door 27 Return door 28a, 28b Air guide passage 30 Exhaust duct 31 Exhaust door 33 Fan partition wall 34 Partition wall 35 Electric actuator 36 Link mechanism 37 Control unit 44, 45, 46 Blow-out temperature sensor

Claims (4)

[Claims] 1. An air introduction fan provided in an air introduction chamber, three types of vehicle interior air outlets of a defroster air outlet, a vent air outlet, and a floor air outlet, and an air introduction fan connected to the vehicle interior air outlet. A reheat air mix type automotive air conditioner having a communicating air duct, a cooling evaporator and a heating heater core installed in the middle of the air duct, and an air mix door installed on the upstream side of the heater core. In the device, a return duct branched from an air guide duct between the evaporator and the defroster outlet and connected to an upstream side of the air introduction fan, and a return duct installed in the return duct, which normally closes the return duct. The door,
A fan partition wall provided inside the air introduction fan and partitioning the air introduction fan perpendicularly to its suction direction; and a fan partition wall provided downstream of the air introduction fan in the air introduction chamber and having a downstream side portion thereof. A partition wall that divides into two air guide passages corresponding to two fan portions of the air introduction fan and one of the two air guide passages on the downstream side of the air introduction fan, and communicates with the outside of the vehicle compartment. An air conditioner for a vehicle, comprising: an exhaust duct for controlling an exhaust gas; and an exhaust door that is provided at a branch portion of the exhaust duct and normally closes the exhaust duct. 2. Outside air is introduced into the air introduction chamber at an upstream side of a fan portion of the two fan portions of the air introduction fan divided by the fan partition wall, the fan portion corresponding to an air guide passage branched from the exhaust duct. An inlet and a first inside air inlet, an outside air door for opening and closing these and a first inside air door are provided, and a second inside air inlet and a second inside air door for opening and closing the second inside air inlet are provided upstream of the other fan portion. The air conditioner for a vehicle according to claim 1, wherein the air conditioner is provided. 3. A first blowout temperature sensor provided at the defroster blowout port, a second blowout temperature sensor provided at a blowout port other than the defroster blowout port, and the first and second blowout temperature sensors. The vehicle air conditioner according to claim 1 or 2, further comprising: a control unit that opens the return door and the exhaust door until the temperature difference between the blowout temperature sensors is within a predetermined temperature difference. 4. The control means closes the first inside air door until the temperature difference between the first and second outlet temperature sensors is within a predetermined temperature difference, and the second inside air door and the inside air door are closed. The vehicle air conditioner according to claim 3, wherein the return door is opened.