JPS60139519A - Air conditioning system for automobile - Google Patents

Abstract

PURPOSE:To prevent a windshield from collecting moisture and as well to prevent the lowering of cooling capacity, by changing the position of a door upon suction of defroster air. CONSTITUTION:An inside and outside air change-over door 7 directly coupled to a vacuum actuator 8, takes its vacuum position when air valves AV1, AV2 are turned on, so that it entirely introduces the outside air, but shuts off vacuum when the air valves are turned off, so that the inside air is circulated. When the air valve AV1 is turned on but the air valve AV2 is turned off, the door 7 takes a position where the outside air is introduced in half. The wiring line between the air valve AV2 and the controller 12 is grounded through a defroster switch (DEFSW) 11, and the air valve A1 closes the contact when the blow-off port takes its DEF position so that the door 7 takes the position where the outside air is introduced in half.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an air conditioner for an automobile. In particular, it is used to prevent windows from fogging when a defroster is blown out, and to prevent the cooling power from being impaired during cooling. The present invention relates to an air conditioner for an automobile suitable for

[Background of the invention]

The structure of a conventional automobile air conditioner is shown in FIG.

In FIG. 1, air introduced from inside the vehicle interior or outside the vehicle interior through an inside/outside air switching door 7 (hereinafter referred to as an intake door) is blown to the evaporator 1 by a blower 3. The air cooled and dehumidified by the evaporator is divided by an air mix door 4 (hereinafter abbreviated as A/M door) into air that passes through the heater core 2 and is warmed again, and cold air that bypasses the heater core as it is. Therefore.

By changing the A/M door position, the temperature of the air discharged from the automobile air conditioner can be changed.

The air that has reached an appropriate temperature by the A/M door is then selected for its outlet in the passenger compartment by a mode door 5 and a differential zero star door (hereinafter abbreviated as DEF door) 6 provided in the heater unit. .

The wind distribution by the DEF door and the mode door will be explained with reference to FIG. The air that is shared through the evaporator and the heater core is mixed by the Fi1 mode door 5.
You can select either the upper outlet of ENT or DEF or the lower outlet of FLOOR. That is, when the mode door position is ■, the air outlet is VENT or tiDEF-t', and when it is ■, the air outlet is FLOOR. When the mode door position is ■,
DEF Select DEF or VENT depending on the door position.

In other words, when the DEF door is 0, the DEF blows out, and when the DEF door is 0, the VEN
It's a T balloon.

Generally, during heating, FLOOR air is used, and in order to prevent the windows from fogging up, a small amount of wind is allowed to flow through DEF air. For this reason, the mode door 5 changes its shape slightly so that it does not close completely when the door is in the ■ position, and becomes the 0 position when the DBF door is in the Fl position and OOR is being blown out. That's what I do. B/L is performed by placing the mode door between ■ and ■ and setting the DEF door to 0.

Table 1 summarizes the above.

As shown in Table 1 above, select the position of each door that determines the air outlet and air temperature in the heater unit such as the mode door, DEF door, A/M door, etc., and determine the air introduced into the passenger compartment. Each intake door position can be selected independently. However, if each is operated independently, it may be possible to use internal air circulation, set the defroster to blow out to remove fogging from the windows, etc. If you use this method, the fogging from the windows will not be removed. In some cases, it may actually be encouraged instead. Therefore, some devices force outside air to be introduced when the air outlet is set to zero star differential.

However, in this case, by introducing outside air when cooling power is required, the cooling power is reduced and the temperature inside the vehicle increases. Furthermore, from the perspective of energy saving, introducing outside air when defroster blows air significantly increases the operating time of the compressor, which has the greatest effect on fuel consumption, and could not be said to be a desirable method. That is, if the inside air is circulated when the defroster is blown out, there is a risk that the windows may fog up, and if the outside air is introduced, there is a drawback that cooling power is insufficient.

[Purpose of the invention]

An object of the present invention is to provide an air conditioner for an automobile that prevents fogging of windows and a decrease in cooling power by changing the position of the intake door when DEF is blown out.

[Summary of the invention]

It is detected that the air outlet is at the tDEF position, and the intake door position is determined. When the intake door is set to internal air circulation by driving the vacuum switch inserted in the middle of the vacuum circuit or the air valve, semi-external air is introduced.

If it is set to half outside air intake or outside air intake,
Do not change the intake door as it is, Kl,,D
This prevents the windows from fogging up and the cooling power from decreasing when EF blows out.

[Embodiments of the invention]

A specific embodiment of the present invention will be described with reference to FIGS. 3 and 4.

FIG. 3 is a diagram showing a negative pressure driving method for the intake door. Internal air circulation provided just before the blower motor 3 or
The intake door 7, which determines the introduction of outside air, is connected to a negative pressure actuator 8.

The negative pressure actuator has a two-stage strontometer, allowing you to select a total of three positions. When each of the air pulps AVI and AV2 is turned on, it opens a negative pressure passage and introduces negative pressure into the actuator, and when turned off, the air pulp AVI and AV2 closes the negative pressure passage and introduces atmospheric air into the actuator. That is, when both AVI and AV2 are OFF, the intake door closes the air inlet on the outside air side by a return spring (not shown), and all internal air is circulated.

When AVl is 0NLAV2 is 0FFl, the vertical aTH-actuator has only one stage, its stroke is shortened, and the intake door is located between the inside air inlet and the outside air inlet, resulting in a so-called semi-outside air introduction state. Furthermore, AV2 is ON
When L, AVI, and 2 are all on, the actuator shortens the entire stroke and the intake door closes the internal air inlet.

All outside air will be introduced.

FIG. 4 shows an electrical drive circuit for air pulp AV1.2. Both AVl and 2 have the e side in common, e
0N10FFt- is carried out by connecting each side to ground using the controller 12 or the like. This controller is not particularly composed of an electronic circuit, but may be a micro 5w that closes the contacts depending on the air intake port selected by the occupant.The other end may be electrically connected to ground. A circuit is provided between the AVI and the controller that connects to ground via the parallel KDEFSW, 11. This DEFSW.

11 is configured to close the contact point when the air outlet is selected to the DEF position. When the circuit is configured as described above, if the air outlet is selected as DEF, at least AV I
F'i0 N, and the intake door is used to partially introduce outside air. In other words, if the intake door is used for internal air circulation and the defroster is used to blow out the AVI
is ONt, half outside air is introduced. When using with semi-outlet air introduction or outside air introduction, if DEF blowout is used, AVl
is ON from the beginning, so DEFSW, 11 ON1
0 F Regardless of F, there is no change in the movement of the intake door.

〔Effect of the invention〕

As a result, when the inside air is being circulated, if the DEF is blown out, the intake door will only introduce half of the outside air, preventing the windows from fogging up and reducing the drop in cooling power.

The present invention is not limited to this embodiment. Even if the natural position of the intake door (the position when the actuator is opened to the atmosphere) is outside air intake, the DEFSW is provided on the e side of the AVI,
If the contact is always closed and the contact is opened when DEF is blown out, A'l will be OFF and DEF will be turned off.
Internal air circulation does not occur during blowing. Furthermore, it can be easily realized in an automatic air conditioner using a μ processor or the like.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an air conditioner for an automobile, FIG. 2 is a block diagram of each door of a heater unit, FIG. 3 is a negative drive circuit diagram of an intake door, and FIG. 4 is a drive circuit diagram of an air pulp. 1... Evaporator, 2... Heater core, 3...
Prowa. 4... Air mix tochi, 5... Mode door, 6...
・・Differential 0 star door ・7・Intake door, 8・
...Negative pressure actuator, 9.10...Air pulp 2
11...1st prison dormitory 2nd figure 3rd RFJH eel 4's

Claims (1)

[Claims] The vehicle has a means for selecting whether to introduce air inside the vehicle interior, air from outside the vehicle interior, or both, and further blows the introduced air toward the front and side glass portions. In an air conditioner for an automobile having a defroster blowout mechanism, when the air outlet is selected for defroster blowing in a state where the introduced air selection means introduces air from the vehicle interior, the introduced air selection means An air conditioner for a vehicle is characterized by introducing air from both inside and outside the vehicle.