JP2008024224A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular air-conditioner adaptable to a window fogging property to be changed according to vehicle speed by a simple structure while ensuring a heating property by inside air circulation. <P>SOLUTION: The vehicular air-conditioner having a defroster function for blowing air inward of a front windshield has a draft unit 2 for discharging air blown inward of the front windshield by the defroster function from a part of a roof located at an upper part in a cabin outside a vehicle. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to a technical field of a vehicle air conditioner having a function of air-conditioning a vehicle cabin so as to improve the air environment and preventing and removing window fogging.

Conventionally, an upper and lower two-layer flow is used to achieve both heating efficiency improvement by internal air circulation and ensuring window clearness by introducing external air (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-105531 (page 2-9, full view)

  However, in the past, since cool air was sent to the rear seat from the DEF of the front seat, there was a risk of temperature interference to the rear seat. Further, the structure is complicated, for example, the blower structure has two stages.

  The present invention has been made paying attention to the above-mentioned problems, and its object is to cope with window fogging that changes according to the vehicle speed with a simple structure while ensuring heating performance by internal air circulation. It is providing the vehicle air conditioner which can do.

  In order to achieve the above object, according to the present invention, in the vehicle air conditioner having a defroster function for blowing air toward the inside of the front window shield, the defroster function allows air blown toward the inside of the front window shield. An air discharge means for discharging the air from a part of the roof to the outside of the vehicle is provided.

  Therefore, in the present invention, it is possible to cope with the window fogging property that changes according to the vehicle speed with a simple structure while ensuring the heating property by the internal air circulation.

  Hereinafter, an embodiment for realizing a vehicle air conditioner according to the present invention will be described based on Example 1 corresponding to the first, second, and third aspects of the invention.

First, the configuration will be described.
FIG. 1 is an explanatory diagram illustrating a vehicle installation state of the vehicle air conditioner according to the first embodiment. FIG. 2 is an explanatory cross-sectional view of a draft portion of the vehicle air conditioner of the first embodiment. FIG. 3 is an explanatory diagram illustrating an internal structure of the vehicle air conditioner according to the first embodiment.

As shown in FIG. 1, the vehicle air conditioner according to the first embodiment mainly includes an internal device 1 provided in the instrument panel and a draft portion 2 provided in a roof portion of the vehicle.
The internal device 1 includes a blower 3, an evaporator 4, a heater core 5, air intake ports 6a and 6b, air blowing ports 7a, 7b and 7c, and doors 8a to 8f.
In the first embodiment, the internal device 1 is provided with an external air intake passage 11 that takes in external air from the upstream side of the intake door 8 b and blows out air from the door 8 d of the air outlet 7 a through a part of the evaporator 4.
The blower 3 generates an air flow that directs air from the air intake ports 6a and 6b from the air outlet ports 7a, 7b, and 7c to the vehicle interior.

The evaporator 4 circulates a refrigerant inside and cools the air by a heat exchange action with the passing air.
The heater core 5 circulates engine cooling water inside and warms the air by heat exchange with the passing air.

The air intakes 6a and 6b are composed of an air intake 6a for taking in the inside air circulating in the passenger compartment and an air intake 6b for taking in outside air from the outside of the passenger compartment.
The air outlets 7a, 7b, and 7c are DEF, that is, an air outlet 7a as a defrosting and defogging function, VENT, that is, an air outlet 7b as a vehicle interior ventilation function, and FOOT, that is, a vehicle interior ventilation function for a foot. As an air outlet 7c.

  The doors 8a to 8f are intake doors 8a for switching between taking in inside air or taking in outside air, doors 8b for introducing outside air for switching whether or not to take outside air regardless of the state of the intake door 8a, A door 8c of the mixture that switches the rate at which the air that has passed through the evaporator 4 further passes through the heater core 5, a door 8d that opens and closes the outside air intake passage 11 at the outlet 7a, a door 8e that switches between VENT and DEF, and an outlet The door 8f is used for switching between 7b and 7c, that is, switching between VENT and FOOT.

Next, as shown in FIG. 2, the draft unit 2 includes a draft unit 21, an actuator 22, and a draft door 23, and is provided between the roof 9 and the lining 10.
The draft unit 21 has a shape for guiding the air sent to the vehicle interior side of the front window shield into the unit between the roof 9 and the lining 10.
The actuator 22 opens and closes the draft door 23 by driving.
The draft door 23 is a door that opens a part of the roof 9 to the outside, and discharges the air guided to the inside of the draft unit 21 to the outside of the vehicle in the open state.

Next, the operation will be described.
[About window clearing]
Car heating is performed using engine cooling water, and indoor air is heated by heating the air introduced or circulated. However, when heating is performed, efficient heating can be performed by performing indoor heating in the inside-air circulation mode. However, in the inside air circulation mode, the humidity in the passenger compartment increases and window fogging occurs. Therefore, in normal heating control, control is based on introduction of outside air, such as introduction of outside air or 80% outside air and 20% inside air. That is, it becomes a subject to ensure window clearness while heating efficiently.

  In order to solve this problem, an “inside / outside air two-layer air conditioner unit” is installed in an actual vehicle. In the FOOT and D / F modes, the air introduced from the DEF is allowed to flow, and the FOOT side is circulated to the inside of the FOOT to efficiently heat the feet while ensuring a clean head and clear window. It is a thing. However, this system is not suitable for a system for independent temperature control because the cold air flowing from the front seat DEF interferes with the rear seat.

  On the other hand, the vehicle air conditioner of the first embodiment is intended to prevent window fogging and ensure a clean head feeling without causing front-rear interference.

[Prevents window fogging and ensures a clean head feeling]
In the vehicle air conditioner of the first embodiment, in the D / F mode, that is, the mode in which air is blown out from the air outlet 7a as DEF and the air outlet 7c as FOOT, the air introduced into the outside air is dehumidified by the evaporator 4. The air blowing port 7a (DEF) is blown out. The air distribution ratio between the air blowing port 7a (DEF) and the air blowing port 7c (FOOT) is FOOT side such as 2: 8, and the air volume of the air blowing port 7a (DEF) is Reduce the FOOT side heating.

At this time, although the air volume from the air outlet 7a (DEF) is reduced, the outside air introduction door 8b is opened, the outside air is dehumidified using a part of the evaporator 4, and the air is blown out from the air outlet 7a (DEF) of the door 8d portion. Like that.
The DEF wind from the air outlet 7a (DEF) is introduced into the vehicle interior according to the vehicle speed.
That is, when the vehicle speed rises and the temperature outside the front window shield decreases, the temperature difference from the inner surface of the front window shield tends to cause window fogging, but the amount of air introduced increases as the vehicle speed increases, That is, window fogging hardly occurs because the temperature of the inner surface of the front window shield approaches the outside.

In this case, since the cold air may reach the rear seat and the rear occupant may be cooled, the draft portion 2 serving as an air flow path is provided on the joint surface with the vehicle body above the front window shield, and the lining Draft to the outside through 10 and the roof 9.
The draft unit 2 has a structure using negative pressure due to vehicle speed, and is provided with an actuator 22 having a communication system similar to that of an actuator normally used in an air conditioner amplifier, and the actuator 22 opens and closes the draft door 23.

As a result, the actuator 22 of the draft unit 2 can be driven by changing the software with respect to the conventional air conditioner amplifier.
The opening degree of the draft door 23 by the actuator 22 of the draft unit 2 is determined using vehicle information such as the vehicle speed processed in the air conditioner amplifier, the room temperature, the outside air temperature, and the like.

Next, the effect will be described.
In the vehicle air conditioner of the first embodiment, the effects listed below can be obtained.

  (1) In a vehicle air conditioner having a defroster function that blows air toward the inside of the front window shield, the air blown toward the inside of the front window shield is discharged from a part of the roof to the outside by the defroster function. Since the draft section 2 is provided, it is possible to cope with window fogging that changes according to the vehicle speed with a simple structure while ensuring heating performance by internal air circulation.

  (2) An outside air intake passage 11 for taking in outside air separately from the intake door 8a for switching the inside and outside air and blowing out from the air outlet 7a of the defroster via the evaporator 4 is provided. Doors 8b and 8d that are driven and controlled are provided at the mouths, and the draft section 2 guides the air blown toward the inside of the front window shield between the roof 9 and the lining 10, and is driven and controlled provided on the roof 9. Intake door 8a is used to discharge air from the draft door 23 to the outside of the vehicle so that the outside air functions as a defroster wind through the evaporator 4 and is discharged from the roof 9 even when the air conditioner control is in the state of inside air circulation. Is switched to the inside air circulation side, outside air is taken in from the door 8b and , The air is blown out from the air outlet 7a of the door 8d as a defroster wind, guided to the draft unit 21 and discharged to the outside from the draft door 23 provided in the roof 9, and the rear seat is defrosted during heating. However, it is possible to cope with the window fogging property that changes according to the vehicle speed with a simple structure while ensuring the heating property by circulating the inside air.

  (3) The outside air taken in by the draft section 2 is a passage that takes in the outside air with a smooth flow from the front side of the vehicle to the front and rear of the air outlet 7a, and the intake air amount changes according to the vehicle speed. The increase in the air temperature difference between the inside and outside of the front window shield increases as the vehicle speed increases, so that the amount of outside air from the outside air intake passage 11 increases and the difference is kept small. Therefore, it is possible to suppress fogging and to contribute to keeping the driver's field of view better.

As mentioned above, although the vehicle air conditioner of this invention has been demonstrated based on Example 1, it is not restricted to these Examples about concrete structure, The invention which concerns on each claim of a claim Design changes and additions are allowed without departing from the gist.
In addition, each door 8a-8f in Example 1 is driven to open and close by an actuator (not shown). The opening is also controlled. Each actuator is controlled by an air conditioner amplifier (not shown).

It is explanatory drawing which shows the vehicle installation state of the vehicle air conditioner of Example 1. FIG. It is explanatory sectional drawing of the draft part of the vehicle air conditioner of Example 1. FIG. It is explanatory drawing which shows the internal structure of the vehicle air conditioner of Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal device 2 Draft part 21 Draft unit 22 Actuator 23 Draft door 3 Blower 4 Evaporator 5 Heater core 6a Air intake 6b Air intake 7a Air blowout 7b Air blowout 7c Air blowout 8a (Intake) door 8b (Outside air introduction) Door 8c (mixture) door 8d door 8e door 8f door 9 roof 10 lining 11 outside air intake passage C vehicle

Claims (3)

In the vehicle air conditioner having a defroster function of blowing air toward the inside of the front window shield,
With the defroster function, air discharge means for discharging the air blown out toward the inside of the front window shield from a part of the roof to the outside of the vehicle,
An air conditioner for a vehicle. In the vehicle air conditioner according to claim 1,
Intake outside air separately from the intake door that switches inside and outside air, and provide an outside air intake passage that blows out the air from the defroster via the evaporator,
Provide doors that are driven and controlled at the intake and outlet of the outside air intake passage,
The air discharge means guides the air blown out toward the inside of the front window shield between the roof and the lining, and discharges the air from the drive-controlled door provided on the roof to the outside of the vehicle,
Even if the air conditioner control is in the state of internal air circulation, the outside air functions as a defroster wind via the evaporator, and is discharged from the roof to the outside of the vehicle.
An air conditioner for a vehicle. In the vehicle air conditioner according to claim 1 or 2,
The outside air taken in by the air discharging means has a structure in which the amount of intake air changes according to the vehicle speed.
An air conditioner for a vehicle.

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