JPS6334969Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an air conditioner for automobiles that uses engine cooling water as a heat source for heating.

Conventional configuration and problems thereof Generally, heating operation of an automotive air conditioner is performed by introducing outside air. This is because when inside air is introduced, the moisture generated inside the vehicle does not escape to the outside of the vehicle, causing the windows of the vehicle to fog up.

However, when the air conditioner is operated to introduce outside air, an amount of cabin air equivalent to the amount of outside air introduced into the cabin is released to the outside of the cabin. Therefore, with conventional configurations, when the temperature of the engine cooling water is low and the air conditioner is not able to fully utilize its capacity, the amount of heat released from the passenger compartment to the outside of the vehicle is too large and a sufficient heating effect cannot be obtained. There were flaws.

Purpose of the invention The purpose of this invention is to solve such problems.
By introducing heated interior air at the same time as air outside the vehicle, it is possible to reduce the amount of interior air released to the outside of the vehicle and improve the heating effect.
The purpose is to prevent fogging of automobile windows.

Structure of the invention In order to achieve this objective, the present invention is an internal/external air control device for selectively introducing vehicle interior air and vehicle exterior air into the ventilation duct of an automobile air conditioner that uses engine cooling water as a heat source for heating. The inside/outside air control device includes: an inside/outside air switching unit provided at the inlet end of the ventilation duct; an inside air inlet opening to the inside/outside air switching unit for introducing cabin air; and the inside/outside air switching unit. The engine comprises an outside air inlet opening to introduce air outside the vehicle, and an inside/outside air switching damper installed in the inside/outside air switching unit to selectively open/close both the inlets, and further detecting the temperature of the engine cooling water. The system is equipped with a cooling water temperature detection sensor and a damper switching control circuit that stops the inside/outside air switching damper at a position where cabin air and outside air are simultaneously introduced when the temperature of the engine cooling water is lower than a predetermined temperature. be.

This damper switching control circuit reduces the amount of air released to the outside of the vehicle when the temperature of the engine coolant is low, improving the heating effect and preventing fogging on the windows of the vehicle.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, 1 is an internal/external air switching unit;
It is provided at the inlet end of the ventilation duct 2 of the air conditioner, and opens and closes an inside air inlet 3 that introduces vehicle interior air A, an outside air inlet 4 that introduces vehicle exterior air B, and the inlets 3 and 4. It is equipped with an inside/outside air switching damper 5. The inside/outside air switching damper 5 is located at position 5a.
At position 5b, only vehicle interior air A is introduced, and at position 5b, only vehicle exterior air B is introduced. In addition to the inside/outside air switching unit 1, the ventilation duct 2 includes a blower 6, a cooling cooler 7, a heater 8 using engine cooling water as a heat source, a temperature control damper 9, and air outlets 10a to various parts of the vehicle interior.
10b, 10c and outlet switching damper 11a,
11b etc.

In FIG. 2, 21 is an engine coolant temperature detection sensor, 22 is a control unit, and 23 is a motor that operates the inside/outside air switching damper 5 via a link mechanism (not shown), and both ends thereof are connected to movable relay contacts. 24
and 25. 26 is a position detection device for the inside/outside air switching damper 5, which has five contacts 26.
a, 26b, 26c, 26d, and 26e, and the contact 26a is connected to the battery via a relay coil 27 for switching the relay movable contact 24.
The point 26b is connected to the terminal 22b of the control unit 22, and the contact 2
Similarly, 6c is connected to a terminal 22c, a contact 26d is connected to an inside air introduction side contact 28a of an inside/outside air changeover switch 28, and a contact 26e is connected to a battery via a relay coil 29 for switching the relay movable contact 25. In addition, the movable part 26f has a contact point 26e.
and the movable part 26g are always connected to the contact 26a, and the movable parts 26f and 26g are connected to the terminal 2 of the motor 23.
When electricity is applied from terminal 3a to terminal 23b, it moves in the direction of arrow C, and conversely, when electricity is applied from terminal 23b to terminal 23a, it moves in the direction of arrow D. This movable part 26
The positions of f and 26g and the position of the inside/outside air switching damper 5 are in a corresponding relationship. Furthermore, the outside air introduction side contact 28b of the inside/outside air changeover switch 28 is connected to the terminal 22a of the control section 22.

In the above configuration, when the engine coolant temperature is lower than a predetermined temperature with the movable contact 28c of the inside/outside air changeover switch 28 set to the outside air introduction side contact 28b, the engine coolant temperature detection sensor 21 detects this temperature. The terminal 22a is detected within the control unit 22.
The space between the terminal 22b and the terminal 22b is opened, and the space between the terminal 22c and the terminal 22d connected to the ground is closed. Further, the contact point 26e of the position detection device 26 is connected to the position detection device 2
6, the relay coil 29 is connected to the terminal 22c via the movable part 26f and the contact 26c.
is energized, and the movable contact 25 is switched from the fixed contact 25a side to the 25b side.

As a result, the motor 23 is energized from the terminal 23a side to the terminal 23b side, the motor 23 starts rotating, the movable parts 26f and 26g of the position detection device 26 start moving in the direction of arrow C, and the inside/outside air switching damper 5 is also linked. It begins to move from position 5b to position 5a via a mechanism or the like. When the movable part 26f moves in the direction of arrow C and separates from the contact 26c, the relay coil 29 is no longer energized, and the movable contact 25 becomes the fixed contact 25a.
The motor 23 stops rotating, and the movable portion 26f of the position detection device 26 remains connected to the contact 26d, and the movable portion 26g remains connected to the contact 26b.

At this time, the inside/outside air switching damper 5 remains at the position 5c where the interior air A and the exterior air B are introduced simultaneously, and the interior air A and the exterior air B are mixed into the ventilation duct 2 of the air conditioner. As a result, the amount of indoor air discharged to the outside of the vehicle is smaller than when only outside air B is introduced into the vehicle, thereby improving the heating effect and preventing fogging of the windows of the vehicle.

Next, when the engine coolant temperature becomes higher than a predetermined temperature, the engine coolant temperature detection sensor 21
detects this, and within the control unit 22, the terminal 22a and the terminal 22b are closed, and the terminal 22c and the terminal 22d are opened. At this time, the contact 26a of the position detection device 26
is connected to the terminal 22b via the movable part 26g and the contact 26b, and the terminal 22a is grounded via the outside air introduction side contact 28b and the movable contact 28c of the inside/outside air changeover switch 28, so that the relay coil 27 is energized. , the movable contact 24 switches from the fixed contact 24a side to the 24b side.

As a result, the motor 23 is energized from the terminal 23b side to the terminal 23a side, the motor 23 starts rotating, the movable parts 26f and 26g of the position detection device 26 start moving in the direction of arrow D, and the inside/outside air switching damper 5 is also linked. Via a mechanism or the like, it begins to move from position 5c to position 5b. When the movable part 26g moves in the direction of arrow D and separates from the contact 26b, the relay coil 27 is no longer energized, and the movable contact 24 becomes the fixed contact 24.
Since it switches to the a side, the motor 23 stops rotating,
The movable part 26f of the position detection device 26 has contacts 26c,
It stops when connected to 26d. At this time, the inside/outside air switching damper 5 remains at the position 5b where only the outside air B is introduced.

Note that when it is necessary to introduce only the cabin air A, such as when traveling in a tunnel, the movable contact 28c of the inside/outside air changeover switch 28 may be set to the position of the inside air introduction side contact 28a. Then, the terminal 22e of the control section 22 is grounded via the inside air introduction side contact 28a and the movable contact 28c, and within the control section 22,
Regardless of the signal from the engine coolant temperature detection sensor 21, the terminal 22c and the terminal 22d are always opened and the motor 23 is rotated until the inside/outside air switching damper 5 reaches the position 5a where only the interior air A is reliably introduced. .

Effects of the invention According to the inside/outside air control device of the automotive air conditioner of the present invention, when the temperature of the engine coolant is low, the inside/outside air switching damper automatically stops at the position where air inside the vehicle and air outside the vehicle are introduced at the same time. This reduces the amount of air inside the vehicle that is released to the outside of the vehicle, improves the heating effect, and prevents the windows of the vehicle from fogging up.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an automobile air conditioner equipped with an inside/outside air control device showing an embodiment of the present invention, and FIG. 2 is a schematic electrical circuit diagram of the automobile air conditioner. 1...Inside and outside air switching unit, 2...Ventilation duct, 3...Inside air inlet, 4...Outside air inlet, 5...
...Inside/outside air switching damper, 21...Engine coolant temperature detection sensor, A...Indoor air, B...Outdoor air.

Claims (1)

[Scope of utility model registration request] An inside/outside air control device for selectively introducing air inside the vehicle and air outside the vehicle is installed in the ventilation duct of an automobile air conditioner that uses engine cooling water as a heat source for heating, and the inside/outside air control device is connected to the ventilation duct of the ventilation duct. an inside/outside air switching unit provided at an inlet end; an inside air inlet opening in the inside/outside air switching unit for introducing air inside the vehicle; and an outside air inlet opening in the inside/outside air switching unit for introducing air outside the vehicle. , an internal/external air switching damper installed in the internal/external air switching unit to selectively open/close both the inlets, further comprising an engine cooling water temperature detection sensor for detecting the temperature of the engine cooling water; An inside/outside air control device for an air conditioner for an automobile, comprising a damper switching control circuit that stops the inside/outside ventilation damper at a position where air inside the vehicle and air outside the vehicle are simultaneously introduced when the temperature is lower than .