JPH10211814A - Inside/outside air control device of air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inside/outside air switching control device of an air conditioner for a vehicle whereby power is supplied to a gas sensor, when detection of a contamination degree of the outside air is started, by negating an influence of humidity, accurately in accordance with a contamination degree of the outside air, inside/outside air control matched with an air conditioning feeling of an occupant can be performed. SOLUTION: In a step S301, a correction reference value VCLR 1 is calculated. Here, when an ignition switch is turned on, a preceding time updated reference value VCLR' is decreased, to be corrected so as to increase a contamination degree. In a step S304, whether the correction reference value VCLR 1 is not less than an updated reference value VCLR 2 in the preceding time or not is decided, when a contamination degree of the outside air corresponding to an output value VDGS of a gas sensor is not less than a contamination degree of the outside air corresponding to the correction reference value VCLR 1, the step advances to a step S306. In a step S306, the latest updated reference value VCLR serves as the correction reference value VCLR 1 set in the step 301.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inside / outside air control device for a vehicle air conditioner, and more particularly to a device for switching from an outside air mode to an inside air mode when air outside a vehicle compartment is dirty.

[0002]

2. Description of the Related Art A prior art is disclosed in Japanese Patent Application Laid-Open No. 8-72528. In this apparatus, an inside / outside air switching control device using a gas sensor for detecting a degree of contamination of outside air of a vehicle compartment is described. More specifically, a control processing value of the degree of dirt is calculated based on a ratio between the degree of dirt outside the vehicle cabin detected by the gas sensor and a predetermined update reference value, which is a reference degree of dirt. When the degree is larger than the degree, the inside / outside air switching door is automatically switched from the outside air mode to the inside air mode by the servomotor.

Here, the above-mentioned update reference value is updated and set according to the degree of dirt outside the vehicle cabin detected by the gas sensor, and the degree of dirt detected by the gas sensor while power is supplied to the gas sensor. Is updated to the lowest value. Then, from when the power supply to the gas sensor is stopped (ignition switch off) to when power is supplied to the gas sensor (ignition switch on), the previous reference value set immediately before the power supply was stopped. Is used as the latest update reference value.

[0004]

However, the above-described conventional apparatus has the following problems. The output value of the above-described gas sensor greatly varies depending on the humidity.
For example, when the gas sensor is formed of a semiconductor element such as SiO ₂ , the higher the humidity, the higher the detected degree of contamination becomes than the actual degree of contamination.

As a result, as shown in FIG. 7, it is assumed that the previous reference value updated and set immediately before the ignition switch is turned off is set when the humidity is low such as when the weather is fine, and then, for example, when it rains. If the ignition switch is turned on when the humidity is high, and the latest updated reference value is the previous reference value, the gas sensor erroneously detects that the detected dirt degree is larger than the actual dirt degree. Therefore, there is a problem that the air conditioning feeling is deteriorated.

Further, in the above-mentioned conventional apparatus, when the previous reference value is set to a very small degree of contamination (for example, a vehicle travels in a mountainous area where the outside air is very clean), there are the following problems. In other words, if the previous reference value is used when the ignition switch is turned on again, the outside air is not very dirty in practice.However, in the calculation of the control processing value, the degree of contamination detected by the gas sensor and the previous reference value are calculated. Becomes large, the degree of contamination of the control processing value increases, and the air conditioner enters the inside air mode,
There is a problem that the air conditioning feeling deteriorates.

Accordingly, the present invention provides a method for detecting the degree of contamination of outside air when power is supplied to a gas sensor.
It is an object of the present invention to provide an inside / outside air switching control device of an air conditioner for a vehicle, which can perform inside / outside air control according to an air conditioning feeling of an occupant in accordance with a degree of contamination of outside air with high accuracy.

[0008]

The present invention employs the following technical means to achieve the above object. In the invention according to the first aspect, a first update setting means for updating and setting a first update reference value which is a reference stain degree so as to be a minimum stain degree detected by the stain degree detecting means (10), When the detection of the degree of dirt is started, a second update setting unit that corrects the immediately preceding update reference value set immediately before the supply of power is stopped so that the degree of dirt gradually increases with time. And, among the first update reference value updated and set by the first update setting means and the correction reference value corrected by the second update setting means, the smaller one of the degree of contamination is determined as the latest update reference value. And third update setting means for performing the setting.

The operation of the present invention will be specifically described with reference to FIG. The symbols in the description are given for easy understanding of the description. For example, when power is supplied at time A in FIG. 6, if the last update reference value VCLR ′ is smaller than the degree of contamination detected by the detection means by the third update setting means, the immediately preceding update reference value VCLR 'Becomes the latest update reference value VCLR 2.

After that, when the time elapses and the time becomes B,
The correction reference value VCLR1 is set by the second update setting means by correcting the immediately preceding update reference value VCLR 'so that the degree of contamination gradually increases with time. And
At this time, when the degree of dirt detected by the detecting means is smaller than the correction reference value VCLR 1 and the previous update reference value VCLR 2 by the third update setting means, the degree of dirt detected by the detecting means is the latest update reference value. And

On the other hand, according to the present invention, the degree of dirt detected by the detection means is larger than the correction reference value VCLR 'and the previous update reference value VCLR2 by the third update setting means, and the correction reference value VCLR1 Is smaller than the updated reference value VCLR2, the latest reference value VCLR becomes the corrected reference value VCLR1. Therefore, the amount of change between the degree of contamination detected by the detecting means and the correction reference value VCLR 1 is reduced.

[0012] Thus, the degree of contamination of the immediately preceding update reference value VCLR ', which was set immediately before the power supply was stopped, is set to a very small value, or when the power supply is performed again, detection is made based on humidity. Even if the degree of contamination detected by the means becomes larger than the actual level, the immediately preceding update reference value VCLR
By setting a correction reference value obtained by correcting '′ so that the degree of contamination increases with time as the latest updated reference value, it is possible to perform inside / outside air control suited to the air conditioning feeling of the occupant.

According to the second aspect of the present invention, the update setting means supplies power to the dirt degree detecting means (10),
When the degree of dirt detection means (10) detects the degree of dirt in the air outside the vehicle cabin, the degree of dirt gradually increases with the lapse of time over the updated reference value set immediately before power supply is stopped. In this manner, the correction reference value is obtained by performing the correction in this manner, and the smaller of the degree of contamination is used as the latest update reference value between the correction reference value and the last update reference value set last time.

According to this, the same operation and effect as the first aspect of the invention can be obtained.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration diagram of an inside / outside air control device of a vehicle air conditioner. FIG. 2 shows a detailed view of a main part of the inside / outside air switching device. As shown in FIG. 1, a vehicle air conditioner 1 is installed in a vehicle interior. The vehicle air conditioner 1 is an air conditioner case 2 which is a well-known air conditioner and forms an air passage into a vehicle interior.
Having. A well-known inside air inlet 3 and an outside air inlet 4 are provided at the most upstream side of the air conditioning case 2. The inside air inlet 3 is provided inside the air-conditioning case 2 with air inside the vehicle (hereinafter, inside air).
The outside air inlet 4 is for taking outside air (hereinafter referred to as outside air) into the air conditioning case 2.

The inside air inlet 3 and the outside air inlet 4 are
In the present embodiment, the inside / outside air switching door 6 which is an inside / outside air switching member
Can be opened and closed selectively. The inside / outside air switching door 6 is rotatably supported by the air conditioning case 2 and switches and adjusts the ratio of inside air and outside air taken in from the inside air inlet 3 and the outside air inlet 4. The inside / outside air switching door 6 is driven by a servomotor 7 as an electric driving means. The drive of the servomotor 7 is controlled by a control device 20 to be described later, whereby the inside / outside air switching door 6 can operate in a range indicated by an arrow A in FIG.

[0017] In the present embodiment, the operating range showing the inside and outside air switching door 6 to close the outside air introduction port 4 while opening the inside air guide inlet 3 as shown in FIG. 2 as outside air mode in FIG. 2 b And the inside / outside air switching door 6 is operated in the operation range shown in FIG. 2A so as to open the outside air introduction port 4 and close the inside air introduction port 3 by driving the outside air into the air-conditioning case 2 by driving to one end of the air conditioning case 2. Drive to the other end side, air conditioning case 2
It is possible to switch between inside air mode in which inside air is introduced.

The air-conditioning case 2 is provided with a blower 5 for generating an airflow toward the passenger compartment downstream of the inside air inlet 3 and the outside air inlet 4. The blower 5 sucks outside air or inside air into the air-conditioning case 2 according to the two inside / outside air modes. Further, although not shown, a well-known evaporator for cooling air is arranged downstream of the blower 5 in the air-conditioning case 2, and a well-known heater core for heating air is arranged downstream of the evaporator. ing. And in the air conditioning case 2,
A well-known air mix door is provided as a means for adjusting the temperature of the conditioned air.

Further, a plurality of air passages for guiding air into the vehicle compartment are formed on the downstream side of the air conditioning case 2. The air passage is a well-known air passage for the face for sending the conditioned air toward the upper body of the occupant, a foot air passage for sending the conditioned air to the lower body of the occupant, a vehicle window. An air passage or the like for a defroster for blowing conditioned air toward the inner surface of the glass is formed.
The flow of air to these three air passages is controlled by a well-known outlet switching door.

As shown in FIG. 1, the engine room 9 of the vehicle
Inside, a gas sensor 10 as a means for detecting the degree of contamination of the outside air is installed. Here, this gas sensor 1
0 may be a known one, but the gas sensor 10 according to the present embodiment uses carbon monoxide (CO) or nitrogen carbide (H).
C) semiconductor devices (for example, Si)
O ₂ ) and an electric heater for increasing the reaction speed of the semiconductor element. And the gas sensor 10
The higher the concentration of the harmful gas (the degree of contamination of the outside air), the lower the electrical resistance value and the lower the output value (output voltage) VDgs. In addition, the gas sensor 10
Has such characteristics that the higher the humidity of the outside air, the lower the output value VDDGS and the higher the degree of contamination.

Next, the control device 20 will be briefly described. The control device 20 is computer means including a RAM, a ROM, and the like. Then, when the ignition switch 30 shown in FIG.
Electric power is supplied from a vehicle battery (not shown). When the ignition switch 30 is turned on, the gas sensor 10 is also supplied with electric power from a vehicle-mounted battery to detect the degree of contamination of the outside air.

In the control unit 20, in addition to the gas sensor 10 as an input terminal, a sensor group 21 (for example, an inside air temperature sensor, an outside air temperature sensor, etc.) for detecting an environmental factor affecting the air-conditioning environment, or provided in the vehicle interior. Air conditioning operation panel 22
Is connected. The air-conditioning operation panel 22 includes a temperature setter 22a for setting a set temperature in the vehicle cabin, and an automatic setting based on a signal from the sensor group 21 so that the temperature becomes the set temperature set by the temperature setter 22a. An auto (AUTO) switch 22b for controlling air conditioning, and the vehicle air conditioner 1
And an inside / outside air switch 22d for manually selecting the inside air mode or the outside air mode. When the auto switch 22b is turned on, the blower 5 is started, and when the off switch 22c is turned on, the blower 5 is stopped.

The control device 20 is connected as an output terminal to the servo motor 7, the blower 5, and the like. Next, control contents of the inside / outside air switching door 6 according to the detection value of the gas sensor 10, which is a main part of the present invention, will be described. FIG.
2 shows a flowchart showing the control contents. here,
This flowchart is based on the ignition switch 3
When 0 is turned on, the operation is performed when the auto switch 22b is on and the blower 5 is in a driving state. The control cycle of this flowchart is several seconds.

First, in step S100, an initialization process such as a timer is performed, a flag is set to 0, and the gas sensor 10 is warmed up. Here, the warm-up is to increase the reaction speed of the semiconductor element by heating the semiconductor element with the above-described electric heater. The warm-up of the gas sensor 10 is performed for about 30 seconds when this flowchart is executed for the first time, and the process proceeds to step S200 only after 30 seconds have elapsed.
During the warm-up, the inside / outside air mode is set to the inside air mode. Thus, even if the outside air is dirty during the warm-up, it is possible to prevent the outside air from entering the vehicle interior.

Next, in step S200, a previous update reference value VCLR 2 = 0 described later is set. The details of the previous update reference value VCLR 2 will be described later. Subsequently, in step S300, the output value VDGS of the gas sensor 10
Sets an update reference value VCLR for controlling the inside and outside air. Here, since the gas sensor 10 has a very large variation in detection accuracy due to the semiconductor element, it is difficult to simply detect whether the outside air is contaminated with the absolute value of the output value VDDGS. Therefore, in this embodiment, the degree of contamination of the outside air is detected based on the amount of change with respect to the update reference value VCLR. Further, the update reference value VCLR is an absolute value of an output value detected by the gas sensor 10. When the outside air is contaminated and the degree of contamination is high, the output value VDGS detected by the gas sensor 10 decreases.

The reference value VCLR will be described later in detail. Next, in step S400, the output value VDGS of the gas sensor 10 is read, and the process proceeds to step S500. In step S500, a processing value Ln used for the inside / outside air control processing described later is calculated. This processing value Ln is calculated by the following equation (1).

[0027]

## EQU1 ## Processing value Ln = output value VDDS / update reference value VCLR
That is, Equation 2 is a change amount with respect to the update reference value VCLR as described above, and the processing value Ln corresponds to the degree of contamination of the outside air in the arithmetic processing. The output value V
Since the DGS becomes smaller as the degree of outside air contamination increases, the processing value Ln decreases as the degree of outside air contamination increases, assuming that the update reference value VCLR is constant.

Next, the routine proceeds to step S600, in which an inside / outside air control process based on the output value VDGS is performed. Hereinafter, the inside / outside air control processing will be described. FIG.
6 is a flowchart showing the control contents of the control program 600. In addition,
When the inside / outside air switch 22d is operated and the inside / outside air mode is manually determined, the following flowchart is not executed, and the inside / outside air mode is selected according to the setting of the inside / outside air switch 22d.

First, in step S601, it is determined whether the processing value Ln is equal to or lower than a predetermined determination level Ls. Here, the determination level Ls is the minimum value of the degree of outside air contamination at which the occupant feels discomfort. When the outside air is contaminated and the degree of dirt is high as described above, the output value VDGS becomes small. Therefore, when the processing value Ln is equal to or lower than the determination level Ls, the degree of dirt in the outside air is higher than a predetermined value and Is when they feel discomfort. And
In this case, the process proceeds to step S602, and the inside / outside air mode is set to the inside air mode. As a result, the dirty outside air does not enter the passenger compartment, and the occupant does not have to feel uncomfortable.

On the other hand, when the processing value Ln is larger than the determination level Ls in step S601, the degree of contamination of the outside air is smaller than a predetermined value, the outside air is clean, and the occupant does not feel discomfort. In this case, step S603
Proceed to. Then, in step S603, the inside / outside air mode is set to the outside air mode. Next, the setting of the update reference value VCLR, which is a main part of the present invention, will be described. FIG. 5 is a flowchart showing the setting contents of the reference value VCLR. This step S300 is performed by the automatic control switch 2
Even if 2b is not turned on, the ignition switch 30 is turned on and the power is supplied to the gas sensor 10 if the ignition switch 30 is turned on.

Further, the update reference value VCLR is set according to the flowchart shown in FIG. 5, and once the update reference value VCLR is set according to this flowchart, the update reference value VCLR is maintained even if the ignition switch is turned off. It is backed up and stored. When the backed-up update reference value VCLR is set to the previous reference value VCLR '(the immediately preceding update reference value), the previous reference value VCLR' is set when the ignition switch is turned on again and this flowchart is executed again. Used to set the latest update reference value VCLR.

Since the update reference value VCLR is repeatedly set in step S300, the previous update reference value VCLR 2 is the update reference value previously set in step S300. Thereafter, the previous reference value VCL
R ', the latest update reference value VCLR, and the previous update reference value VCLR2 will be described. The last reference value VCLR ′, the latest update reference value VCLR, and the last update reference value VCLR 2 are output from the gas sensor 10 by the output VDGS.
Therefore, the smaller the value, the greater the degree of contamination.

First, when the flow proceeds to this flowchart for the first time immediately after the ignition switch is turned on, in step S301, the previous reference value VCLR 'is corrected by the following equation (1).

[0034]

## EQU2 ## where correction reference value VCLR1 = previous reference value VCLR'-kt where k is a constant, and t is the elapsed time since the ignition switch was turned on. Since the time t is 0 in this description, the correction reference value VCLR 1 is set to VCLR ′ in step S301.

Subsequently, the routine proceeds to step S302, in which the ignition switch 30 is turned on, and the previous update reference value VCL when this flowchart is executed.
It is determined whether R2 is smaller than the actual output value VDGS of the gas sensor 10. Here, for the sake of explanation, immediately after the ignition switch 30 is turned on, since the previous update reference value VCLR 2 = 0 has been set in step S200, the determination result in step S302 must be YE
In step S303, the process proceeds to step S303.

Next, in step S303, the previous update reference value VCLR 2 is set as the output value VDDGS. Then, the process proceeds to step S304, where the correction reference value VCLR 1 (for the explanation, VCLR ′) is changed to the previous update reference value VCLR 2 (for the explanation,
It is determined whether or not the output value is equal to or greater than the output value VDGS). Then, in step S304, the correction reference value VCLR 1 is smaller than the previous update reference value VCLR 2, that is,
If it is determined that CLR 2 (output value VDGS) is less dirty than the correction reference value VCLR 1, the process proceeds to step S305. Then, in step S305, the latest update reference value VCLR is changed to the previous update reference value VCLR 2 (output value VDDGS
).

That is, when the output value VDGS of the gas sensor 10 is smaller than the previous update reference value VCLR 2 when the flowchart of FIG. 5 is executed for the first time, the latest update reference value VCLR becomes the above output value VDDGS. Is set.
On the other hand, in step S304, it is determined that the correction reference value VCLR1 is equal to or greater than the previous update reference value VCLR2, that is, the previous update reference value VCLR2 (output value VDGS) has a higher degree of contamination than the correction reference value VCLR1. And step S305
Proceed to. Then, in step S305, the latest updated reference value VCLR is set to the correction reference value VCLR1 (VCLR ').

As described above, in the present embodiment, immediately after the ignition switch 30 is turned on, the previous reference value VCLR ′ set immediately before the previous ignition switch 30 was turned off, and immediately after the ignition switch 30 was turned on, Of the output values VDGS of the gas sensor 10 in the above, the one with the smaller degree of contamination is the latest updated reference value VCLR.
Becomes

Next, a case will be described in which the process exits from the flowchart and proceeds to the flowchart again. For the sake of explanation, the previous update reference value VCLR 2 is the previous output value VDDGS. First, in step S301, the correction reference value VCLR 1 is calculated by the above equation (1). In this case, the control cycle time of the flowchart shown in FIG. 5 has elapsed since the ignition switch 30 was turned on. Accordingly, the correction reference value VCLR1 is corrected so as to be smaller than the previous reference value VCLR 'and to increase the degree of contamination.

Next, in step S302, the current output value VDDGS is set to the previous update reference value VCLR2 (the previous output value VDDGS).
) It is determined whether or not the above. Then, step S302
At this time, the output value VDGS becomes the previous update reference value VCLR 2
(Previous output value VDGS) or more, that is, the current output value VDGS
If it is determined that DGS is smaller than the previous update reference value VCLR 2, the process proceeds to step S303, and the previous update reference value VCLR 2 is set as the current output value VDDGS.

On the other hand, in step S302, the current output value VDGS is set to the previous update reference value VCLR2 (the previous output value VDGS).
GS), that is, when it is determined that the current output value VDDS is larger than the previous update reference value VCLR 2, the process proceeds to step S303, and the previous update reference value VCLR 2 is left as it is, and step S304 is performed. Proceed to.

Subsequently, in step S304, the correction reference value VCLR 1 is set in step S302 or step S302.
It is determined whether or not it is equal to or greater than the previous update reference value VCLR 2 set in 303. Then, in step S304, the correction reference value VCLR 1 is smaller than the previous update reference value VCLR 2, that is, the correction reference value VCLR 1 is changed to the previous update reference value VCL.
If it is larger than the degree of contamination of R 2, step S30
Go to 5. Then, in step S305, the latest update reference value VCLR is set to the previous update reference value VCLR 2.

On the other hand, in step S304, when the correction reference value VCLR 1 is equal to or greater than the previous update reference value VCLR2, that is, when the correction reference value VCLR 1 is smaller than the previous update reference value VCLR 2, the process proceeds to step S306. Then, in step S305, the latest update reference value VCLR is set as the correction reference value VCLR1. As described above, after the ignition switch 30 is turned on, when the process proceeds to the flowchart shown in FIG. 5 twice or three times, in step S301, the correction is gradually made so that the contamination level of the previous reference value VCLR 'becomes large. Thus, the correction reference value VCLR 1 is set.

Then, in the present embodiment, step S
In 301, the correction is made so that the previous reference value VCLR 'becomes about half in about 10 minutes. Therefore,
Each time the process proceeds to step S301, the correction amount (K ·
t) is slightly smaller than the previous reference value VCLR '. As described above, in the present embodiment, the previous reference value VCLR 'is corrected so that the degree of contamination increases with time, and the correction reference value VCLR 1 is set. If the correction reference value VCLR 1 is smaller than the previous update reference value VCLR 2 and the present output value VDDS, the latest update reference value VCLR becomes the correction reference value VCLR 1. Therefore, even if the output value VDGS of the gas sensor 10 becomes larger than the actual degree of contamination due to the influence of humidity, the correction reference value VCLR 1 and the output value V
Since the amount of change from DGS is small, that is, the degree of contamination of the processing value Ls is small, it is difficult to enter the inside air mode. As a result, the inside and outside air can be controlled according to the air conditioning feeling of the occupant.

Further, even if the degree of contamination of the previous reference value VCLR 'is set to be very small because the vehicle travels in a mountainous area where the outside air is very clean, when the ignition switch 30 is turned on, Previous reference value VCLR ′
Is corrected so as to increase the degree of dirt, and the amount of change between the correction reference value VCLR 1 and the output value VDDS is reduced, so that it is difficult to enter the inside air mode. As a result, the inside and outside air can be controlled according to the air conditioning feeling of the occupant.

In addition, when the degree of contamination of the output value VDDGS is smaller than the degree of contamination of the correction reference value VCLR 1, the latest updated reference value VCLR is applied to the gas sensor 10.
, And the degree of contamination of the outside air can be accurately determined. By the way, in the present embodiment, the correction reference value VCLR 1 is corrected so that the degree of contamination gradually increases with the passage of time. Therefore, when this is repeated, the latest update reference value VCLR always becomes the value of the gas sensor 10. The output value becomes VDGS. The reason for such correction is as follows.

In the gas sensor 10, the previous reference value VCLR 'immediately before the ignition switch 30 is turned off is set according to the state of the outside air immediately before the ignition switch 30 is turned off. Therefore, when the ignition switch 30 is turned on, the outside air state (for example, humidity) immediately before the ignition switch 30 is turned off.
May be different. When the ignition switch 30 is turned on and the above-described inside / outside air control processing is performed, by using the update reference value VCLR set according to the state of the outside air at that time, the degree of contamination of the outside air at that time is determined. Accordingly, the inside / outside air control needs to be performed with high accuracy.

Therefore, in the present embodiment, step S30
By correcting the previous reference value VCLR 'in step 1 so that the degree of contamination is increased, the determination result in FIG. 302 becomes YES while repeating the flowchart shown in FIG.
The latest update reference value VCLR becomes the output value VDDS. Thereby, when performing the inside / outside air control processing described above, the reference value VCLR can be set according to the state of the outside air at that time,
It is possible to reliably prevent dirty outside air from entering the vehicle interior without being affected by humidity.

(Other Embodiments) In the above embodiment, the processing value Ln is the ratio between the output value VDDS and the update reference value VCLR, but may be the difference between the output value VDDS and the update reference value VCLR.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an inside / outside air control device of a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a detailed view of the inside / outside air control device in the embodiment.

FIG. 3 is a flowchart showing control contents of a control device 20 in the embodiment.

FIG. 4 is a flowchart showing control contents of a control device 20 in the embodiment.

FIG. 5 is a flowchart showing control contents of a control device 20 in the embodiment.

FIG. 6 is a time chart showing control contents of a control device 20 in the embodiment.

FIG. 7 is a time chart showing control contents of a conventional control device.

[Explanation of symbols]

2 ... air-conditioning case, 3 ... inside air inlet, 4 ... outside air inlet, 6
... inside and outside air switching door, 7 ... servo motor, 10 ... gas sensor, 20 ... control device.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yu Hirose 1-1-1, Showa-cho, Kariya-shi, Aichi Pref.

Claims (2)

[Claims] 1. An air-conditioning case (2) forming an air passage into a vehicle interior, an inside / outside air switching member (6) for adjusting a ratio of inside air and outside air taken into the air-conditioning case (2), and inside / outside air switching. Drive control means (7, 20) for automatically controlling the driving of the member (6), and dirt degree detecting means (1) for detecting the degree of dirt of the air outside the vehicle cabin by supplying power.
0), wherein the first update reference value, which is a reference degree of contamination, is set to be the minimum degree of contamination detected by the degree of contamination detection means (10). First update setting means for updating and setting, when the detection of the degree of dirt is started, the degree of dirt gradually decreases with the lapse of time from an update reference value set immediately before the supply of power is stopped. A second update setting means for correcting the value to be larger; a first update reference value updated and set by the first update setting means; and a correction reference value corrected by the second update setting means. An inside / outside air switching control device for an air conditioner for a vehicle, comprising: a latest update setting unit that sets a smaller degree of contamination as a latest update reference value. 2. An air-conditioning case (2) forming an air passage to a vehicle interior, an inside / outside air switching member (6) for adjusting a ratio of inside air and outside air taken into the air-conditioning case (2), and inside / outside air switching. Drive control means (7, 20) for automatically driving and controlling the member (6), dirt degree detecting means (10) for detecting the degree of dirt of the outside air of the vehicle when electric power is supplied,
An update setting means for updating and setting an update reference value which is a reference stain degree so as to be a minimum stain degree detected by the stain degree detection means (10). When the detection of the degree of contamination is started, the update setting means gradually increases the degree of contamination with the elapse of time to an update reference value set immediately before the supply of power is stopped. A correction reference value is obtained by correcting the degree of dirt between the correction reference value and a previously updated reference value set last time, which is the latest update reference value. Inside / outside air switching control unit for air conditioner.