JPS6331814A - Airconditioning device for vehicle - Google Patents

Abstract

PURPOSE:To eliminate an excessive rise in air temperature at an air outlet facing a driver's chest when fresh air is introduced, by making control whereby the open/close condition of a door at a fresh air passage is detected and an airconditioning condition is fixed when the door is in an open condition. CONSTITUTION:An airconditioning device is provided with such fittings as an intake door 12, a blower fan 13 and an air mix door 15, and has a passage 19 for introducing fresh air from the outlet of an evaporator 14 to a diffuser 18 facing a driver's chest. And the fresh air is diffused by opening a door 19a near the outlet of the passage 19. In the aforesaid constitution, a door open/close detecting means 20 is provided for detecting the open/close condition of the door 19a. And when the open condition of the door 19a has been detected, a control means 21 controls the opening of the air mix door 15 and the number of revolutions of a motor for driving the blower fan 13 via an actuator 22, thereby fixing an airconditioning condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle air conditioner that can selectively introduce dehumidified and cooled air into a vehicle interior.

(Prior Art) In recent years, many vehicles are equipped with air conditioners that control the temperature and humidity inside the vehicle to make the interior of the vehicle comfortable. FIG. 4 shows a block diagram of an automatic air conditioning system that automatically controls the temperature in the vehicle interior to a desired temperature when the occupant sets the desired temperature. In this system, an autoamplifier consisting of a microcomputer, etc.
An inside temperature sensor 2 that detects the temperature inside the vehicle, an outside temperature sensor 3 that detects the outside temperature, and a solar radiation sensor 4 that detects the amount of solar radiation.
．． Temperature setting device for setting the vehicle interior temperature to a desired temperature 5. Engine water temperature sensor 6 that detects the temperature of engine cooling water
The necessary blowout temperature is calculated based on the temperature signal from the air mix door, and based on this, an air mix door opening signal and an air volume signal are sent to the air mix door opening control circuit 7 and the air volume control circuit 8, respectively. As a result, the air mix door opening control circuit 7 uses the actuator 9 to drive the air mix door 10 to the optimum opening, and the air volume control circuit 8 controls the rotation speed of the fan motor 11.

The cold air and warm air that have been dehumidified and cooled by the evaporator are mixed by the air mix door 10, and the air is mixed through the air outlet provided at the center and on both sides of the instrument panel and the air outlet provided at the bottom of the windshield (called a defroster).
Alternatively, it is blown into the passenger compartment from the air outlet at the foot.

By the way, in such an air 3J device, there is no difference in air volume between the upper and lower air outlets, so if you operate the device for a long time, the area around your head may feel foggy and you may feel drowsy. It is used to wake up passengers and relieve the feeling of haziness around the head.

Air dehumidified and cooled by an evaporator (fresh air)
A method has been proposed in which the fresh air is guided through a separate fresh air passage without passing through the air mix door, and is then blown out directly from the air outlet in the center of the instrument, and this method has been adopted in some car models.

FIG. 5 is a schematic diagram of an air conditioner (for example, Utility Model Application No. 58-182822) that employs such an air conditioning method.
12 is an intake door that switches and introduces inside air and outside air, 13 is a proa fan that introduces and blows air, 14 is an evaporator that dehumidifies and cools the air, and 15 indicates the proportion of the dehumidified and cooled air that flows toward the heater core 16. The air mix doors to be determined are: 17 is a chest air outlet provided on both sides of the instrument panel, and 18 is a chest air outlet provided in the center of the instrument panel. In addition to this, there is also an air outlet under the feet.

In such a configuration, a fresh air passage 19 is provided that directly guides fresh air from the outlet side of the evaporator 14 to the outlet 18. A door 19a is provided near the exit of this passage 19, and when the door 19a is opened, Fresh air is blown out from the air outlet 18 into the vehicle interior. The fresh air door 19a is opened and closed by operating a lever on the instrument panel.

However, when the door 19 of the fresh air passageway is opened in winter to introduce fresh air into the vehicle interior, the temperature in the vehicle interior inevitably decreases, so the air conditioning is controlled by the auto amplifier l to raise the temperature in the vehicle interior. However, as a result, the temperature of the hot air blown out from the foot vents also rises, causing a problem in that the feet become hot and uncomfortable.

(Objective and Structure of the Invention) The present invention has been made in view of the above points, and an object of the present invention is to perform comfortable air conditioning control even when fresh air is introduced into the passenger compartment in order to eliminate the feeling of fog in the head. In order to achieve this object, as shown in FIG. 1, which shows the overall configuration of the present invention, door opening/closing detection means 20 for detecting the opening/closing state of the door 19a of the fresh air passage 19 is provided. When the open state of the door is detected by the means 20, the Jlm means 21 controls the opening degree of the air mix door and the rotation speed of the blower fan motor to fix the air conditioning conditions.

(Example) The present invention will be explained below based on the drawings.

FIG. 0'S2 is a block diagram of an embodiment of the air conditioner according to the present invention.The difference from the example shown in FIG. A switch 20 that turns ON and OFF is newly provided, and its ON and OFF states are input to the autoamplifier 1. This fresh air door opening/closing switch 20 is turned on by the fresh air door 19a.
It may be turned on and off, or it may be turned on and off using the movement of an actuator (not shown) that drives the fresh air door 19a.

Now, the auto amplifier 1 is as shown in Figure 2.

The state of the fresh air door opening/closing switch 20 is monitored (F-1), and when it is OFF, normal air conditioning control is performed by calculating the opening degree and air volume of the air mix door (F-2). However, when the occupant operates a lever on the instrument panel to open the fresh door 19a, the fresh door opening/closing switch 20 is turned on. At this time, the air conditioning conditions, that is, the opening degree of the air mix door and the air volume are maintained at the values at that time (F-3).

In this way, even if the temperature inside the vehicle decreases due to the introduction of fresh air, the air conditioning operation that would raise the temperature inside the vehicle will not be performed, causing even higher temperature warm air to blow out from the outlet at the feet, causing discomfort to the occupants. There is no such thing as giving.

Thereafter, when the fresh air door 19a is closed, air conditioning control is started.

In the above embodiment, an air conditioner that introduces air that has been dehumidified and cooled by an evaporator into the vehicle interior is exemplified, but the present invention is not limited to this type of air conditioner. Of course, it can also be applied to a type of vehicle that is directly introduced into the vehicle interior. Further, the door 19a of the fresh air passage 19 may be opened and closed manually or automatically.

(Effects of the Invention) As explained above, in the present invention, the air conditioning conditions are fixed while the fresh air door is opened in the air conditioning mode to introduce the dehumidified and cooled Flange Unit into the vehicle interior. There is no problem of the temperature of the blown air rising when fresh air is introduced and the feet become hot, and the air conditioning is always comfortable for the passengers.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram according to the present invention, FIG. 2 is a block diagram of an embodiment of an air conditioner according to the present invention, FIG. 3 is a flow chart of the main part of the air conditioning operation according to the present invention, and FIG. 4 is a conventional FIG. 5 is a block diagram of this example of an air conditioning bag. FIG. 5 is a schematic diagram showing the configuration of a conventional air conditioner. 1...Auto amplifier, 10...Air mix door. 11...Fan motor, 19...Fresh air passage, 19a...Fresh air door, 20...Fresh air door opening/closing switch

Claims (1)

[Claims] A fresh air passageway that bypasses the heater core to lead the dehumidified and cooled air into the vehicle interior; a door opening/closing detection means for detecting an open/closed state of a door provided in the fresh air passageway; 1. A vehicle air conditioner, comprising: a control means for fixing air conditioning conditions.