JPH04108407U - Automotive air conditioner - Google Patents

Abstract

(57) [Summary] [Purpose] To save power in automobile air conditioners. [Configuration] Actuator 12 that opens and closes the mixing door 10
A mixing door position detection means 13 is provided to detect the position of the mixing door 10, and the anti-freeze switch 27 is set so that the mixing door position detected by the mixing door position detection means 13 is higher as it is on the hot side. Make the temperature change.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an air conditioner for automobiles.

0002

[Conventional technology]

Generally, air conditioners for automobiles use air that has been cooled and dehumidified by an evaporator to be mixed into a mixed drive. A part or all of it is passed through the heater core and heated to adjust the temperature. A loose reheat air mix system is used. In this reheat air mix system, the water in the air passing through the evaporator To prevent steam from freezing and clogging the evaporator fins, When the air temperature at the evaporator outlet falls below a predetermined set temperature near 0℃, Anti-freeze switch that shuts down the compressor and stops the supply of refrigerant to the evaporator is provided.

0003

[Problem that the idea aims to solve]

This kind of automobile air conditioner has a mixing door on the hot side and a cold side. However, as long as the temperature of the air passing through the evaporator does not drop below the set temperature. , the compressor is always running. Therefore, the mixed door is In some cases, the air does not need to be cooled very much and only needs to be able to dehumidify. The compressor is driven and the evaporator cools the air to near 0℃. As a result, power was wasted. The aim of this invention is to solve these problems, and to reduce the power consumption of the compressor. The purpose of this invention is to provide an air conditioning system for automobiles that can be used in a vehicle.

0004

[Means to solve the problem]

In order to achieve the above object, the present invention converts the air cooled by the evaporator into a mixing drive. At the same time, part or all of the flow is divided into the heater core to adjust the temperature, while the evaporator When the air temperature at the outlet of the evaporator drops below the specified set temperature, cooling is turned off to the evaporator. In an automobile air conditioner equipped with an antifreeze switch that stops the supply of medium, the above-mentioned A mixing door that detects the position of the mixing door in the actuator that opens and closes the mixing door. A position detecting means is provided, and the mixing door position detected by the mixing door position detecting means is Change the temperature setting of the antifreeze switch so that it is higher on the hot side. It was made by sea urchin.

[0005]

[Effect]

When the mixing door is on the cold side, the antifreeze switch temperature setting is low. is set as follows. Therefore, the air temperature at the evaporator outlet drops to its set temperature. The compressor is always running. Therefore, the air The heater continuously cools the vehicle, and cold air is constantly blown into the interior of the vehicle. Also, if the mixing door is located on the hot side, the anti-freeze switch setting The temperature is set high. Therefore, the air temperature at the evaporator outlet will reach its set temperature. When the temperature drops below the set temperature, the antifreeze switch is activated. Compressor stops.

[0006]

【Example】

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an automotive air conditioner according to the present invention. There is a blower motor on the upstream side of duct 1. A blower 3 driven by a motor 2 is provided, and this blower 3 is connected to an inside/outside air switching door 4. The inside air or is designed to draw outside air into the interior. On the downstream side of this blower 3, there is a An evaporator 7 is provided to cool the air. 8 is the compressor, Eva The refrigerant flowing out from the porator 7 is compressed and passed through a condenser and an expansion valve (not shown). Then, it is supplied again to the evaporator 7 and circulated. Evaporator 7 A temperature detection sensor 9 is attached to the air outlet side.

[0007] A mixing door 10 and a heater core 11 are provided on the downstream side of the evaporator 7, The air that has passed through the evaporator 7 is divided by the mixing door 10, and part or all of it is heated. The mixture is heated and mixed by a heater core 11. The mixing door 10 is an actue The rotation position is determined by the actuator 12. It is detected by the mixing door position detection sensor 13 consisting of a potentiometer attached to the It has become so.

[0008] An air distribution chamber 14 is formed on the downstream side of the heater core 11, and from this air distribution chamber 14, Ventilation duct leading to the vent outlet 15 on the front of the front panel (not shown) 16, a defroster duct 18 leading to the differential air outlet 17 below the windshield, The heat duct 20 that reaches the heat outlet 19 located below the front panel is branched. Ru. Each duct 16, 18, 20 has a vent door 21, a differential door 22, and a A boot door 23 is attached so that it can be opened and closed. Among these, the differential door 22 An opening/closing detection sensor 24 is attached.

[0009] 25 is a control unit that corresponds to the temperature selected by the temperature selector 26. The actuator 12 is driven by a predetermined amount to rotate the mixing door 10, and the mixing door is rotated by a predetermined amount. It is designed to control the temperature of the air mixed downstream of 10. Ma In addition, this control unit 25 is provided with an anti-freeze switch 27. The antifreeze switch 27 is a temperature detection sensor provided on the air outlet side of the evaporator 7. When the detected temperature from the sensor 9 becomes lower than the predetermined lower limit temperature S, the compressor 8 Disengage the magnetic clutch to stop the compressor 8, and then set the predetermined upper limit temperature. When the temperature rises to a certain degree, the compressor 8 is driven.

0010 The lower limit set temperature S of this antifreeze switch 27 is determined by the mixing door position detection sensor 13. and the detection signal from the differential door opening/closing detection sensor 24. ing. That is, when the differential door 22 is closed, it is indicated by the solid line A in FIG. , the lower limit set temperature S is set at the mixing door position (cold “C” side, that is, the heater It is indicated by the degree of opening (%) from the side that blocks the flow into A 11. ) is up to 20% When it is 0℃ and 20% or more, it will increase in proportion to the opening degree, and at 100% it will be 15℃. ing. The reason why the mixing door position is set to 0°C up to 20% is due to the mixing door 11 set. This is for safety reasons, taking into consideration vertical errors and looseness, and the scope is limited to this. It's not a thing. Further, if it is detected that the differential door 22 is opened, as shown by the broken line B in the figure, , the set temperature is changed to a lower temperature than when the differential door 22 is closed. Na Note that the upper limit temperature setting is set to a temperature at which minimum dehumidification can be performed.

In the automobile air conditioner having the above configuration, when the differential door 22 is closed and either the vent door 21 or the heat door 23 is opened in hot weather, the temperature selector 26 controls the cold "C" temperature. When the "C" side temperature is selected, the control unit 25 drives the actuator 12 according to the selected temperature to rotate the mixing door 10 to the cold "C" side _P1 position (see FIG. 2). At this time, the mixing door position detection sensor 13 detects the position of the mixing door 10 based on the amount of drive of the actuator 12, and transmits this detection signal to the control unit 25.

The control unit 25 sets the lower limit set temperature S of the antifreeze switch 27 according to the curve shown in FIG. change. Here, since the mixing door 10 is at the P ₁ position on the cold “C” side, a low temperature S ₁ ° C. is set as the lower limit temperature setting of the antifreeze switch 27.

In this case, as shown in FIG. 3, the air at T ₁ °C sucked in through the blower 3 is cooled and dehumidified by the evaporator 7 and lowered to T ₂ °C, and a part of it is heated by the heater core 11. By mixing with others, the temperature rises to T ₃ °C and flows out from the vent outlet 15 or the heat outlet 19. Since the lower limit temperature setting of the antifreeze switch 27 is set to a low temperature _S1 near 0°C as described above, as shown by the two-dot chain line in FIG. The air temperature rarely reaches its set temperature S ₁ and the compressor 8 is always driven. Therefore, since the air is continuously cooled by the evaporator 7, cold air is constantly blown into the vehicle interior.

Next, when the temperature on the hot "H" side is selected by the temperature setting device 26 during the cold season, the mixing door 10 is rotated to the _P2 position on the hot "H" side in the same manner as described above. The position is detected by the mixing door position detection sensor 13. As a result, the lower limit set temperature of the antifreeze switch 27 is changed to a temperature _S2 higher than _S1 in the cold case described above.

In this case, as shown in FIG. 4, the temperature T ₁ of the sucked air is low and the evaporator 7 tends to cool it down too much, as shown by the two-dot chain line in the figure, but the antifreeze switch 27 Since the lower limit set temperature S ₂ is high, the air temperature T ₂ at the outlet of the evaporator 7 easily drops to the set temperature S ₂ . When the temperature falls below the set temperature _S2 , the temperature detection sensor 9 detects this, and the antifreeze switch 27 stops the compressor 8. As a result, the cooling capacity of the evaporator 7 decreases and the outlet temperature T ₂ increases, but when the outlet temperature T ₂ reaches the predetermined upper limit setting temperature, the compressor 8 is driven again and the evaporator 7 cools the air. Dehumidification is performed. In this way, when the air becomes too cold in the evaporator 7, the compressor 8 is stopped, thereby saving power.

Here, when the differential mode is selected and the differential door 22 is opened, the differential door open/close detection sensor 24 detects this and transmits the detection signal to the control unit 25 . As a result, the lower limit temperature setting of the antifreeze switch 27 is set to the temperature _S3 , which is lower than _S2 . As a result, the evaporator 7 cools the air to a lower temperature and dehumidifies it sufficiently, so air that is heated by the heater core 11 and sufficiently dried is blown out from the differential air outlet 17, and the fog on the windshield is quickly cleared. It turns out.

[0017] In the above embodiment, the lower limit temperature setting of the anti-freeze switch 27 is set to the lower limit temperature of the mixing door 11. Although it is designed to rise linearly according to the opening degree of You may also do so.

[0018]

[Effect of the idea]

As is clear from the above explanation, according to the present invention, the mixing door position is on the hot side. I changed the temperature setting of the antifreeze switch so that it was a certain level higher. , if the hot side temperature is selected, the anti-freeze switch will operate at the higher set temperature. The compressor is then stopped, saving power.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an automotive air conditioner according to the present invention.

FIG. 2 is a diagram showing the relationship between the mixing door position and the set temperature of the antifreeze switch.

FIG. 3 is a diagram showing the change in air temperature when the mixing door is located on the cold side.

FIG. 4 is a diagram showing the change in air temperature when the mixing door is located on the hot side.

[Explanation of symbols]

7... Evaporator, 10... Mixing door, 11... Heater core, 12... Actuator, 13...
Mixing door position detection sensor, 27...Anti-freeze switch.

Claims (1)

[Scope of utility model registration request] Claim 1: The air cooled by the evaporator is divided by a mixing door and part or all of it is passed through a heater core to adjust the temperature. In an automobile air conditioner equipped with an anti-freeze switch that stops supply of refrigerant to the mixing door, the actuator for opening and closing the mixing door is provided with mixing door position detection means for detecting the position of the mixing door, and the mixing door position detection means is provided. An air conditioner for an automobile, characterized in that the set temperature of the anti-freezing switch is changed so that the temperature of the mixing door detected by the means is higher as the temperature increases toward the hotter side.