JPS6150822A - Switching device for inside air and outside air - Google Patents

Abstract

PURPOSE:To hold the temperature within a car room to a comfortable state by sensing the temperature of the outside air and the inside air, and switching an air mixed door to an inside air circulation when the temperature of the inside air is low, and switching the mixed door to an outside air introduction when the temperature of the outside air is low. CONSTITUTION:When an automatic control switch 11c is pressed, a microcomputer 20 operates the difference DELTAH between an inside air temperature Hin from an inside air temperature sensor 10 and an outside air temperature Hout from an outside air temperature sensor 9. When the difference DELTAH is over +A of given temperature, the microcomputer determines a present air conditioning mode, and if it is an outside air introduction mode, a control signal for holding this mode is outputted, and if it is an inside air circulation mode, a switching signal to the outside air introduction mode is outputted to allow an intake door to open the introduction port for the outside air. On the other hand, when the temperature difference DELTAH is under -A of given temperature, the microcomputer determines a present air conditioning mode, and if it is the inside air circulation mode, a signal for holding this mode is outputted, and if it is the outside air introduction mode, a switching signal to the inside air circulation mode is outputted to allow the intake door to open the suction port for the inside air, and thus the temperature within the car room is maintained comfortable.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement in an inside/outside air switching device that switches between air conditioning modes of outside air introduction for introducing air outside the vehicle interior and inside air circulation for circulating air inside the vehicle interior. .

[Conventional technology] Conventionally, this type of indoor/outside air switching! ! ! For example,
There is one described in Japanese Patent Application Laid-open No. 57-164806. This internal/external air switching device basically uses a dew condensation sensor to detect a cloudy condition inside the window panel, and when this condensation sensor detects the cloudy condition, it switches from an air conditioning mode that recirculates inside air to an air conditioning mode that introduces outside air. On the other hand, when the dew condensation sensor does not detect the cloudy condition, the air conditioning mode of internal air circulation is maintained.

According to such an inside/outside air switching device, when V3 dew is generated inside the window panel and it becomes cloudy, outside air is introduced into the cabin, and the condition of the air inside the cabin approaches that of outside air. It is possible to eliminate fogging of the window panel, and to ensure visibility through the window panel while driving the vehicle.

[Problems to be Solved by the Invention] However, when the condensation sensor does not detect a cloudy state of the wind panel, the above-mentioned inside/outside air switching device does not function normally even if the inside air humidity is higher than the outside air humidity. Therefore, it cannot be said that the optimal switching between inside and outside air is performed for the occupants, especially when the outside air temperature is high and the inside air temperature is high.

[Means for solving the problems] In view of the above, the present invention provides an i! i! The purpose is to provide an inside/outside air switching device that can maintain the IM in a comfortable state, and its configuration consists of an outside air intake that introduces air from outside the vehicle interior, and a An interior cut-out for the intake door 104 that can handle each air conditioning mode for internal air circulation that circulates indoor air! 51!
When purchasing, outside air i! detects the humidity of outside air. iii
II detection means 101, an inside air humidity detection means 102 that detects the humidity of inside air, and the outside air and inside air i! Based on the detection signal 11'1 from the ia degree detection means, the airmic door is switched from outside air introduction to inside air circulation when the inside air temperature is lower than outside air temperature 5 degrees, and when the outside air humidity is lower than the inside air humidity, the inside air circulation is started. Switching means 1 for switching from to outside air intake
It consists of 03.

[Embodiment 1 of the invention Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is an explanatory view of an example of several parts of the inside/outside air switching device according to the present invention. In the figure, 2 is an outside air inlet for introducing air from outside the vehicle interior, and 3 is an outside air intake port for introducing air from outside the vehicle interior. 4 is an intake door for closing (opening) either the outside air inlet 2 or the inside air inlet 3; 5 is an intake door for driving the intake door 4; It is an actuator. Also, 6 is a fan motor, 7
is a proa fan, the fan motor 6 and the proa fan 7 constitute the proa unit 1, and the rotation of the proa fan 7 in conjunction with the rotation of the fan motor 6 opens the outside air inlet that is not closed by the intake door 4. 2 or the inside air intake port 3 is prevented from blowing out to the interior of the vehicle. , 8 is an outside air introduction duct for guiding the air outside the vehicle interior to the outside air introduction port 2. Inside this outside air introduction duct 8, the air outside the vehicle interior, that is, the outside air, is supplied to 11 people. An outside air humidity sensor 9 is provided to detect humidity. Further, an inside air humidity sensor 10 is provided near the inside air intake port 3 to detect the humidity of the air inside the vehicle, that is, inside air.

FIG. 3 is a block diagram showing the basic configuration of the control section of the internal/external air switching device according to the present invention.

In the same figure, J3 is shown, and 9 and 10 are external air i! installed at the positions shown in FIG. ti degree sensor, indoor air humidity sensor, 11 is an operation switch for specifying each air conditioning mode: outside air introduction (F RS ), inside air circulation (REC), or outside air automatic control ft (AUTO). It has an outside air introduction switch 11a, an inside air circulation switch 11b, and an automatic control switch 11c corresponding to the air conditioning mode. 20 is an outside air humidity sensor 9 and an inside air temperature sensor 10
, is a microcomputer that performs switching control I of the intake door 4 according to a flowchart 11-to be described later based on each input information from the operating switch 11. A control signal is output to the intake door actuator 5 in order to forcibly control the opening of the outside air introduction port 2 or the opening of the inside air intake port 3 by the intake door 4 in response to the air conditioning mode specified by the inside air circulation 11 switch 11b. It has become. Further, when the air conditioning mode is designated by the intransitive switch 121I of the operation switch 11, the microcomputer 20 outputs the detected G degree signal 1-4out from the outside air humidity sensor 9 and the detected humidity signal 1-4out from the inside air 9 degree sensor 10. For example, as shown in Fig. 4, when the difference △H between the inside air humidity 1-1 inch and the outside air humidity 1OLIt is greater than the predetermined humidity difference +A, outside air is introduced from the inside air circulation (RFC) (FR8).
In order to switch the air conditioning mode to The air conditioning mode is turned off and a control signal is output to perform moxibustion. The above control signals from the microcomputer 20 are transmitted to the intake door actuator 5 via the drive device 21, and the intake door actuator 5 operates according to the control signals.

Next, the operation of this apparatus will be explained according to the flowchart shown in FIG.

The microcomputer 20 has an outside air humidity sensor and an inside air humidity sensor 10. Each signal from the operation switch 11 is read at a predetermined period. Here, when the inside air circulation switch 11b of the operation switch 11 is pressed, the intake door switching control section 20
should switch the air conditioning mode to internal air circulation (RFC) mode (output a control signal, and actuate the intake door actuator 5 based on this control signal to cause the intake door 4 to open the internal air intake port 3 (to open the external air inlet 2)
), one person switch 11 (the force circulates the air inside the vehicle. Also, outside 2), one person switch 11
When a is pressed, the microcomputer 20 outputs a control 'l+ signal to switch to the outside air 29 person (FR3) mode, and the intake door actuator 5 is operated based on this 11 control signal to open the intake door 4 to the outside air 29 person (FR3) mode. The air intake 2 is opened (the inside air intake port 3 is closed 11), and air from outside the vehicle is introduced into the vehicle interior by the operation of the pro-ar unit 1 in the same manner as described above.

On the other hand, if the intransitive verb 11 switch 11c is pressed,
The microcomputer 20 confirms the designated signal from this own IJJ tlI control switch 11c, and detects the detected inside air humidity (-1 inch) from the inside air humidity sensor 10 and the outside air humidity sensor 9.
The difference Δt() from the detected outside air GIIJ)-1out is calculated. Then, when it is determined that this humidity difference ΔH is greater than the predetermined humidity +A, the current air conditioning mode is further confirmed and the current outside air intake (FR8 > mode, the control t2n IA is output to maintain this air conditioning mode, and if the current internal air circulation (REC) mode is, outside air is introduced (FR8
) mode is output, and the intake door 4, which had closed the outside air inlet 2, is driven to open the outside air inlet 2 based on this +7J return signal.

On the other hand, if it is determined that the humidity difference △1・1 is less than the predetermined humidity difference -A, the current air conditioning mode is further changed to mFr,
If it is currently in the inside air circulation (REC) mode, the microcomputer 20 outputs a dust signal to maintain this air conditioning mode, and if it is currently in the outside air introduction (FR3) mode, the dust signal is output to the inside air circulation (RF C>) mode. The switching signal 11 is also output, and the intake door 4, which had closed the inside air intake port 3, is driven to open the inside air intake port 3 based on this switching υ control signal.

Furthermore, the humidity difference 1 is a predetermined value i! If it is determined that the humidity is neither above 1-A nor below the predetermined humidity -A, the output state of the control signal at that point is changed to maintain the current air conditioning mode (outside air intake or inside air fI ring). hold. If the automatic control switch 11c confirms the specified signal and determines that it is not the specified signal, abnormality processing such as forcibly switching to internal air circulation is performed.

As described above, according to this embodiment, when the inside air humidity becomes Ω or more than the predetermined humidity A from the outside air humidity of 8 degrees, the air conditioning mode is switched from inside air circulation to outside air introduction, and the outside air humidity becomes lower than the inside air humidity by the predetermined humidity A. When this happens, the air conditioning mode will be switched from outside air intake to inside air circulation.
The air inside the vehicle is kept at a lower humidity t'. In addition, in this embodiment, the intake doors 4, 1 and 7
As shown in Fig. 3, the J exchange 2i control characteristics are so-called hysteresis characteristics, so that the inside air humidity and outside air humidity! When the difference between J'3 and J'3 is small, the hunting phenomenon of the intake door 4 can be prevented.

Note that it is appropriate to set the predetermined humidity A shown in FIG. 3 to a value as small as possible within a range that can prevent the hunting phenomenon described above. In addition, in the present invention, the conditions for switching the air conditioning mode from inside air circulation to outside air circulation are such that the humidity difference ΔH between inside air humidity and outside air humidity is ΔH−0 (or Δl−1>O), and outside air is Article 1 of switching air conditioning mode to internal air circulation
'1 may be set so that the above ΔH satisfies ΔH<O (or H-0).

[Effects of the Invention] As explained above, according to the present invention, it becomes possible to maintain the air inside the vehicle at a comfortable humidity level, and as a result, it becomes possible to realize air conditioning filII7II that is more comfortable for the passengers. .

[Brief explanation of the drawing]

FIG. 1 is a diagram corresponding to claims of the inside/outside air switching device according to the present invention, FIG. 2 is an explanatory diagram showing an example of the UI 1M section of the inside/outside air switching device according to the present invention, and FIG. FIG. 4 is an explanatory diagram showing an example of the side pattern of the microcomputer in FIG. 3; FIG. 2 is a flowchart showing the flow. 2...Outside air intake port 3...Inside air intake port 4...
Intake door 5...Intake door actuator 9...Outside air humidity sensor 10...Inside air humidity sensor 11...Operation switch 20...Microcomputer 101...Outside air humidity detection means 102...Inside air Humidity detection means 103...Switching means 104...Intake door special n-Applicant: Nissan Motor Co., Ltd. Attorney: Patent attorney: Hiroshi Tsuchihashi
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Claims (1)

[Claims] In an inside/outside air switching device having an intake door that switches between air conditioning modes of outside air introduction for introducing air outside the vehicle interior and inside air circulation for circulating air inside the vehicle interior, the outside air humidity detection means for detecting the humidity of the outside air and the humidity of the inside air are provided. Based on the detection information from the outside air and inside air humidity detection means, the intake door is switched from outside air introduction to inside air circulation when the inside air humidity is lower than the outside air humidity, and when the outside air humidity is lower than the outside air humidity. 1. An inside/outside air switching device comprising: switching means for switching from inside air circulation to outside air introduction when the humidity is lower than inside air humidity.