JP2006193116A - Inside/outside air switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inside/outside air switching device capable of keeping an air cleaning state in a vehicular cabin for a long time, with a simple structure. <P>SOLUTION: In an inside/outside air switching box 2, an inside air inducing port 3 and an outside air inducing port 4 composed of a main outside air inducing port 4a and a partial outside air inducing port 4b are opened. The inside air inducing port and the main outside air inducing port are switched to open/close by a rotary door 5. The partial outside air inducing port is opened/closed by a sub door 7 driven independently from the rotary door. In an inside air mode, the rotary door fully opens the inside air inducing port, and fully closes the main outside air inducing port. Further, the sub door fully opens the partial outside air inducing port to induce predetermined necessary outside inducing amount into the inside/outside air switching box. Therefore, even if the inside air mode is selected in automatic air conditioning control, the outside air of the predetermined amount is also taken in, so that rise in carbon dioxide concentration is suppressed, and the unpleasant feeling of an occupant can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inside / outside air switching device, and is particularly suitable for use in a device that adjusts the amount of inside air and outside air introduced from an inside air inlet and an outside air inlet in a vehicle air conditioner.

  Conventionally, in a vehicle air conditioner, in order to improve the comfort of the vehicle interior space, in particular, to completely purify the air in the vehicle interior, an internal / external air switching door has been provided according to the contamination of the air outside the vehicle interior detected by an exhaust gas sensor or the like. There has been a switch from outside air introduction to inside air circulation to prevent air pollution in the passenger compartment (see, for example, Patent Document 1).

Also, when it is necessary to deodorize the outside air, the inside / outside air switching door is displaced to an intermediate opening position between the inside air introduction port and the outside air introduction port so that only the introduced outside air passes through the deodorization filter. Some adsorb the malodorous components in the outside air and then mix them with the inside air (see, for example, Patent Document 2).
JP 2003-80926 A Japanese Patent Laid-Open No. 11-192831

  In the prior art disclosed in Patent Document 1, since the outside air introduction port is fully closed and the inside air is circulated, it is possible to shut off the contaminated air outside the vehicle. However, if this inside air circulation state is continued for a long time, the inside of the vehicle is ventilated. The carbon dioxide concentration in the vehicle interior becomes high and there is a problem in terms of air purification in the vehicle interior.

  Further, in the prior art of Patent Document 2, in addition to the intermediate position mode of the inside / outside air inlet, the inside air in the normal all outside air mode, outside air deodorizing mode in all outside air mode, all inside air mode, and all inside air mode. It is necessary to move the deodorizing filter provided in the inside / outside air switching door together with the position control of the inside / outside air switching door for each mode such as the deodorizing mode, and the structure is complicated, the pressure loss is increased, and the deodorizing filter is replaced. There were problems such as difficulty.

  An object of the present invention is to provide an inside / outside air switching device capable of maintaining an air purification state in a passenger compartment for a long time with a simple configuration.

  In order to achieve the above object, according to the first aspect of the present invention, an outside air introduction port (3, 3b, 13a, 13b) that is arranged in a vehicle and introduces air inside the vehicle compartment and outside air introduction that introduces air outside the vehicle compartment. The inside / outside air switching box (2) having the mouths (4, 4a, 4b, 14a, 14b) and the inside / outside air switching box are arranged, and the inside air introduction amount from the inside air introduction port and the outside air introduction amount from the outside air introduction port are set. Inside / outside air switching means (5, 7, 11) whose position is controlled so as to change, and the inside / outside air switching means fully closes the inside air introduction port in the outside air mode and fully opens the inside air introduction port in the inside air mode. In the inside air mode, the outside air introduction port is partially opened and controlled to be in a partially outside air introduction mode in which a predetermined amount of outside air is introduced.

  According to the present invention, the inside / outside air switching means normally closes the inside air introduction port in the outside air mode so that only the outside air is introduced into the inside / outside air switching box, and the inside air introduction port is fully opened in the inside air mode. In internal air / outside air switching mode, the internal air / outside air switching means fully opens the internal air introduction port, and partially opens the external air introduction port to introduce a predetermined amount of external air. This makes it possible to partially ventilate the inside air. Therefore, the air purification state in the passenger compartment can be maintained for a long time by the partial outside air introduction mode in the inside air mode with a simple configuration.

  According to the present invention, as described in claim 2, the outside air introduction port includes a partial outside air introduction port (4b) for partially introducing outside air and a main outside air introduction port (4a). A sub-door (7) that partially opens and closes the outside air introduction port and an inside / outside air switching door (5) that switches between opening and closing the inside air introduction port and the main outside air introduction port are provided. And the main outside air introduction port are fully closed, and the sub door can be partially controlled to introduce a predetermined amount of outside air from the outside air introduction port.

  As described in claim 3, the inside air introduction port includes a partial inside air introduction port (3b) provided adjacent to the partial outside air introduction port, and the subdoor has a partial outside air introduction port and a partial inside air. If the inlet and outlet are switched to open and close, in the inside air mode, the outside door is partially closed by the sub door and the inside air inlet is partially opened by the sub door, thereby increasing the outside air introduction amount and the inside air introduction amount. It can be operated as a so-called all-air mode. Such an operation in the all-in-air mode is effective at the time of maximum cooling of the air conditioner (at the time of Max Cool).

  Further, as described in claim 4, if the inside / outside air switching door and the sub door are driven by the individual actuators (34a, 34b), respectively, the time delay is not dependent on the operation state of the doors. No, quick position control can be performed.

  In addition, a subdoor can be comprised with a plate door as described in Claim 5, or can be comprised with a film door (11) as described in Claim 6.

  Furthermore, as described in claim 7, if a dust removing / deodorizing filter (12) is arranged on the upstream side of the sub door at a part of the outside air introduction port, a part of the outside air introduction mode can be used from the part of the outside air introduction mode. By passing the outside air through the dust removal / deodorization filter, it is possible to introduce the purified outside air and to easily replace the dust removal / deodorization filter.

Further, according to the present invention, as described in claim 8, the outside air introduction port includes a first outside air introduction port (14a) and a second outside air introduction port (14b), and the inside air introduction port is a first inside air introduction port. (13a) and a second inside air inlet (13b),
The inside / outside air switching means switches between opening / closing a first inside / outside air switching door (15a) that switches between opening and closing of the first outside air introduction port and the first inside air introduction port, and a second outside air introduction port and a second inside air introduction port. A second inside / outside air switching door (15b), and in the outside air mode, the first and second inside / outside air switching doors fully close the first and second inside air introduction ports, respectively, and in the inside air mode, the first and second The inside / outside air switching door fully opens the first and second inside air introduction ports, and the position of at least one of the first and second inside / outside air switching doors is controlled so as to partially introduce a predetermined amount of outside air. Can be configured.

  The invention according to claim 9 is provided with an exhaust gas sensor (32a) for detecting the degree of dirtiness of the outside air, and the predetermined amount in the partially outside air introduction mode decreases as the degree of dirtiness of the detected outside air increases. The inside / outside air switching means is controlled.

  As a result, when the degree of contamination of the outside air is large, the predetermined amount, which is the amount of outside air introduced in the partially outside air introduction mode, is reduced, so that the air in the passenger compartment can be prevented from being contaminated.

  Furthermore, the invention described in claim 10 is provided with a vehicle speed sensor (32b) for detecting the vehicle speed of the vehicle, and a predetermined amount in the outside air introduction mode is preset in accordance with the detected increase in the vehicle speed. The inside / outside air switching means is controlled so as to achieve the introduction amount.

  As a result, even if the ram pressure increases due to an increase in the vehicle speed, the amount of outside air introduced in the partially outside air introduction mode can be controlled to become the required outside air introduction amount regardless of the increase in the ram pressure.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a first embodiment and shows a schematic configuration of a blower unit 1 in a vehicle air conditioner. The blower unit 1 is mounted on the front side of the passenger seat below the instrument panel installed in the front part of the vehicle interior, and an inside / outside air switching box 2 is disposed on the upper side in the vehicle mounted state. A blower 10 is disposed on the lower side of the box 2 through a dust removing / deodorizing filter 9.

  The upper part of the resin inside / outside air switching box 2 is provided with an arcuate circumferential wall surface 2a centering on a rotation shaft 6 of the rotary door 5 described later, and introduces air in the vehicle interior into the inside / outside air switching box 2. An inside air introduction port 3 that is an opening for opening, an outside air introduction port 4 that is an opening for introducing air outside the passenger compartment into the inside and outside air switching box 2, and a partial inside air introduction port that is an opening for introducing inside air 3b is formed.

  The outside air inlet 4 includes a main outside air inlet 4a and a part of the outside air inlet 4b that are adjacent to each other. The main outside air inlet 4a and the part of the outside air inlet 4b may be separated by the partition 4c or may not be provided with the partition 4c. In FIG. 1, the partition 4c is indicated by a broken line. Further, the partial outside air introduction port 4b and the partial inside air introduction port 3b are adjacent to each other, and both of them are opened and closed according to the opening degree of the sub door 7 described later.

  The rotary door 5 as an inside / outside air switching door includes an arc-shaped circumferential wall 5 a centering on the rotating shaft 6. The circumferential wall 5 a is disposed on the inner circumferential side of the circumferential wall surface 2 a in the upper part of the inside / outside air switching box 2 and is formed to have a larger area than the inside air introduction port 3.

  The position of the rotary door 5 is controlled around the rotation shaft 6 by a servo motor 34a, and the circumferential wall 5a of the rotary door 5 can open and close the inside air introduction port 3 and the main outside air introduction port 4a by this rotation. That is, depending on the rotation angle of the rotary door 5, the inside air introduction port 3 is fully closed and the main outside air introduction port 4a is fully opened (outside air mode; inside air introduction amount = 0), and the inside air introduction port 3 is fully opened and the main outside air introduction port. The inside air introduction amount and the outside air introduction amount can be changed to the fully closed state 4a (full inside air mode or inside air mode + partial outside air introduction mode).

  The sub door 7 is configured by a plate door that rotates around a rotation shaft 8 provided at an end of the opening wall 4d of the outside air introduction port 4b. The position of the sub door 7 is controlled by a servo motor 34b to give a rotation angle. By this rotation, the sub door 7 partially closes the outside air introduction port 4b (at this time, the some inside air introduction port 3b is fully opened) to partially introduce outside air. The opening 4b is fully opened (partial internal air introduction port 3b is fully closed at this time), and the amount of external air introduction in the partial external air introduction mode can be changed. Note that the position of the sub door 7 is controlled independently of the operation (position control) of the rotary door 5.

  The dust removal / deodorization filter 9 passes the entire amount of the outside air or the inside air or the mixture thereof introduced into the inside / outside air switching box 2 and sends it to the downstream blower 10 below. This dedusting / deodorizing filter 9 is a deodorant such as activated carbon supported on a porous filter base material such as urethane foam by an appropriate binder, and removes dust from passing outside air, inside air, or a mixture thereof. And adsorption of malodorous components (for example, diesel exhaust gas odor components such as acetaldehyde).

  FIG. 2 is an electric control block diagram according to the first embodiment, and an air conditioning electronic control unit (ECU) 31 is composed of a microcomputer or the like, and is installed in the blower unit 10 and an air conditioning unit (not shown). Various air conditioners are controlled in accordance with a preset program. The ECU 31 is supplied with power from an in-vehicle battery (not shown) when an ignition switch (not shown) of the vehicle engine is turned on.

  The ECU 31 receives a sensor signal from a known sensor group 32 and an operation signal from an air conditioning operation panel 33 installed in the vehicle interior instrument panel. The sensors related to the electric control of the first embodiment of the sensor group 32 will be described. Exhaust gas sensor 32a for detecting a odor component outside the vehicle compartment (diesel exhaust gas odor component etc. outside the vehicle compartment), and the vehicle speed. A vehicle speed sensor 32b for detecting (vehicle speed) is provided.

  Among the operation signals input from the operation panel 33, the operation signals related to the electric control of the first embodiment are manually set to the auto switch signal for instructing to automatically switch the inside / outside air and the inside / outside air introduction mode. These are the outside air introduction switch signal and the inside air circulation switch signal.

  As for the actuator group 34 in various air conditioners controlled by the ECU 31, only those related to the electric control of the first embodiment will be described. A servo motor 34 a that controls the rotation angle (rotation amount) of the rotary door 5. A servo motor 34b that controls the rotation angle (rotation amount) of the sub door 7 is provided. The fan motor 34c of the blower 10 is also controlled by the ECU 31 so as to have a rotation speed corresponding to a desired air volume.

  The output shafts of the servo motors 34a and 34b are connected to the rotary shaft 6 of the rotary door 5 and the rotary shaft 8 of the sub door 7 via appropriate transmission mechanisms. That is, in this embodiment, servo motors 34a and 34b as actuators are provided independently on the two rotating members 6 and 8 provided in the inside / outside air switching box 2.

  Next, the operation of the first embodiment in the above configuration will be described with reference to FIG. 1, FIG. 3, and FIG. 3 and 4 omit the blower 10 and the like. In the following, for simplification, the air volume of the blower 10 is constant, and the internal air volume or the external air volume introduced into the inside / outside air switching box 2 is defined as the opening area of the inside air inlet 3 or the outside air inlet 4a, 4b. (In other words, the rotation angle of the rotary door 5 or the sub door 7) will be described.

  FIG. 1 shows an operating state in the all-inside air mode in which no outside air is introduced into the inside / outside air switching box 2 (outside air introduction amount = 0). This all-in-air mode is, for example, based on a command value from the ECU 31 when the air conditioner is at maximum cooling (at Max Cool), and the rotary door 5 fully opens the inside air inlet 3 and fully closes the main outside air inlet 4a. The sub door 7 controls the positions of the servo motors 34a and 34b so that the outside air inlet 4b is partially closed. Even when the inside air circulation switch is pushed by the occupant from the operation panel 33 and the inside air circulation switch signal is given to the ECU 31, the operation in the all inside air mode is executed.

  In the full inside air mode, an inside air amount corresponding to 100% of the opening of the inside air introduction port 3 is introduced (arrow FI1 in FIG. 1), and a part of the inside air amount corresponding to the opening is further introduced from the inside air introduction port 3b. (Arrow FI2 in FIG. 1). That is, in the full inside air mode, the amount of circulating inside air returned to the vehicle interior by the blower 10 is added to the 100% introduction inside air from the inside air introduction port 3 by adding the auxiliary inside air amount from the inside air introduction port 3b. It can be increased than usual.

  FIG. 3 shows an operating state in the outside air mode where no inside air is introduced into the inside / outside air switching box 2 (inside air introduction amount = 0). This outside air mode is, for example, in normal auto air-conditioner control, when the ECU 31 selects the inside / outside air switching mode in accordance with the target blowing temperature TAO calculated based on various sensor information, or by the occupant from the operation panel 33 This is executed when the outside air is introduced by pressing and the outside air introduction switch signal is given to the ECU 31.

  In the outside air mode, based on the command value from the ECU 31, the rotary door 5 fully closes the inside air introduction port 3 (accordingly, the main outside air introduction port 4a is fully opened), and the sub door 7 partially opens the outside air introduction port 4b. The servomotors 34a and 34b are position-controlled so that they are fully opened and the inside air inlet 3b is fully closed.

  Thereby, in the outside air mode, the outside air amount (arrow FO1 in FIG. 3) corresponding to 100% of the opening of the main outside air inlet 4a and the auxiliary outside air amount corresponding to 100% of the part of the outside air inlet 4b (FIG. 3). 3, the amount of outside air to which the arrow FO2) is added is introduced into the inside / outside air switching box 2.

  FIG. 4 shows an operating state in the inside air mode + partial outside air introduction mode (hereinafter abbreviated as “partial outside air introduction mode”) of the present embodiment. This partial outside air introduction mode is executed when the ECU 31 selects the inside air mode in accordance with the target blowing temperature TAO in normal automatic air conditioner control.

  In the partial outside air introduction mode, the rotary door 5 fully opens the inside air introduction port 3 and fully closes the main outside air introduction port 4a based on a command value from the ECU 31, and the sub door 7 partially opens the outside air introduction port 4b. The positions of the servomotors 34a and 34b are controlled so as to fully close the partial air introduction port 3b.

  Thus, in the partial outside air introduction mode, the amount of inside air (arrow FI1 in FIG. 4) corresponding to 100% of the opening of the inside air introduction port 3 and auxiliary necessary outside air corresponding to 100% of the partial outside air introduction port 4b. The air-fuel mixture to which the introduction amount (arrow FO2 in FIG. 4) is added is introduced into the inside / outside air switching box 2.

This necessary outside air introduction amount is, for example, part of the outside air introduction port 4b so that it becomes about 30 m ³ / h as a ventilation amount by outside air necessary for suppressing an increase in the carbon dioxide concentration in the passenger compartment when four people get on. The opening area is set. Conversely, the necessary amount of outside air introduced is constant according to the air blowing level of the blower 10, that is, when the air blowing level of the air blower 10 is high, the opening of the external air introduction port 4 b is partially reduced. The opening degree of the sub-door 7 may be adjusted so that the opening degree of the outside air introduction port 4b is partially increased when the ventilation level is low.

  The partial outside air introduction mode can be quickly switched from the all inside air mode only by changing the rotation angle of the sub door 7.

  Further, in the partial outside air introduction mode, the opening degree of the sub door 7 is controlled in accordance with detection signals from the exhaust gas sensor 32a and the vehicle speed sensor 32b.

  FIG. 5 shows a control map for changing a predetermined amount of the outside air introduced from the part of the outside air inlet 4b in accordance with the outside air dirt level (dirt degree) detected by the exhaust gas sensor 32a. Note that FIG. 5 shows that the outside air contamination level decreases as the sensor output of the exhaust gas sensor 32a increases, that is, the outside air is purified air.

When it is determined that the outside air contamination level is “clean”, the opening degree of the sub door 7 is 100%, that is, a part of the outside air inlet 4b is fully opened, and a part of the outside air introduction amount (predetermined amount) is required. The amount introduced (30 m ³ / h).

When it is determined that the outside air contamination level is increased and the outside air is in a “slightly dirty” state, the sub door 7 is opened so that a part of the outside air introduction amount is, for example, about half of the necessary outside air introduction amount (15 m ³ / h). The degree is small, that is, the opening area of a part of the outside air inlet 4b is set to about 50%. In this case, the partial internal air introduction port 3b is also changed from the fully closed state to the open state, and the internal air is introduced into the internal / external air switching box 2 from the partial internal air introduction port 3b.

  If the outside air contamination level is further increased and it is determined that the outside air is in a “dirty” state, the partial outside air introduction port 4b is fully closed, and the partial outside air introduction amount is set to zero. This operating state is the same as the operating state in the all inside air mode shown in FIG.

  In this way, even in the partially outside air introduction mode, the amount of outside air introduced from the outside air introduction port 4b is reduced and further blocked as the degree of air pollution outside the passenger compartment increases. As a result, the air in the passenger compartment can be prevented from being contaminated by exhaust gas or the like.

  FIG. 6 shows a control map for controlling the opening degree of the sub door 7 in accordance with the vehicle speed detected by the vehicle speed sensor 32b. The sub-door opening degree of 100% indicates that the opening area of a part of the outside air introduction port 4b is 100% (fully open), and the sub-door opening degree of 0% indicates that the opening area of the part of the outside air introduction port 4b is 0. % (Fully closed).

As the vehicle speed increases, the opening degree of the sub door 7 is decreased from 100% to 0% at a predetermined vehicle speed or higher. That is, with the increase in the vehicle speed, the inflow of outside air due to the increase in ram pressure increases in some outside air introduction ports 4b. Correspondingly, by reducing the opening area of some of the outside air introduction ports 4b, the amount of outside air introduced into the inside / outside air switching box 2 in accordance with the increase in ram pressure is reduced to the required outside air introduction amount (for example, 30 m ^3). / H).

  The target value of the sub-door opening relative to the vehicle speed is preferably set so as to decrease continuously as shown by the dotted line in FIG. 6, but may be set so as to decrease stepwise as shown by the solid line in FIG. .

FIG. 7 shows an example in which changes in the carbon dioxide concentration in the passenger compartment were measured. That is, in FIG. 7, the horizontal axis represents time, the vertical axis represents the carbon dioxide concentration in the passenger compartment, and four passengers get in the passenger compartment, and the above-described all-in-air mode (always in-air introduction), outside-air mode (always outside-air introduction), and The change in the carbon dioxide concentration in three conditions using the partial outside air introduction mode (necessary outside air introduction amount = 30 m ³ / h) and the control of the partial outside air introduction amount according to the detection value of the exhaust gas sensor 32a is shown. .

  In general, in an enclosed space, the amount of carbon dioxide exhausted by the breathing of human beings in the space naturally continues to rise when it is not ventilated. The actual measurement result of FIG. 7 shows this well, and in the all-air mode, the carbon dioxide concentration in the passenger compartment continues to increase with time. On the other hand, in the outside air mode, the outside air inlet 4 (4a, 4b) is fully opened to introduce the maximum amount of outside air and thereby constantly ventilate the passenger compartment, so that the carbon dioxide concentration in the passenger compartment can be kept low. 7 from the actual measurement results.

  In the present embodiment, in the inside air mode + partial outside air introduction mode, it can be ventilated by the necessary outside air introduction amount, so that an increase in the carbon dioxide concentration in the vehicle interior is suppressed, and a comfortable vehicle interior space can be created. .

  As described above, in the first embodiment, the contaminated air entering from the outside air can be substantially suppressed by the dust removing / deodorizing filter 9, and in some outside air introduction modes, the outside air is always kept in a predetermined amount (necessary) during the inside air mode. By introducing the amount of outside air), an increase in the carbon dioxide concentration in the passenger compartment can be suppressed to alleviate passenger discomfort.

  In addition, when automatic air-conditioning control is performed in winter, etc., even when the inside air mode is selected according to the target blowing temperature, this partial outside air introduction mode is also used. Can be introduced. Therefore, the occurrence of fogging of the window glass can be suppressed by the partially introduced outside air, and a comfortable and safe vehicle interior space can be created for the passenger.

  Furthermore, the mode switching between the all-inside air mode, the partially outside air introduction mode, and the outside air mode can be performed by the rotary door 5 and the sub door 7 that can be driven independently of each other, so that quick operation can be performed with a simple configuration. It is.

(Second Embodiment)
In the first embodiment, the internal air introduction port 3 and the main / external air introduction port 4a are switched by a rotary door 5 as an internal / external air switching door, and a part of the external air introduction port is operated by a sub door 7 that operates independently of the rotary door 5. Although what opens and closes 4b was shown, 2nd Embodiment shows the example which provides two sets of the inside-and-outside air switching door and the inside-air introduction port and outside-air introduction port which are switched and opened by this.

  As shown in FIG. 8A, the inside / outside air switching box 2 of the second embodiment includes a first inside air introduction port 13a, a first outside air introduction port 14a, and a first inside air introduction port 13a and a first outside air introduction port 14a. And a first inside / outside air switching device 15a that is a plate door that switches between opening and closing, a second inside air introduction port 13b, a second outside air introduction port 14b, and a second inside air introduction port 13b and a second one. And a second inside / outside air switching device including a second inside / outside air switching door 15b that is a plate door that switches between opening and closing the outside air introduction port 14b. The first outside air introduction port 14a and the second outside air introduction port 14b are disposed adjacent to each other via a partition wall 14c.

  The opening degree of the first inside / outside air switching door 15a and the second inside / outside air switching door 15b is controlled (position control) independently of each other by the servo motors 34a, 34b, as in the first embodiment.

  FIG. 8A shows an operating state in the all-inside air mode, and the first inside / outside air switching door 15a fully opens the first inside air introduction port 13a and fully closes the first outside air introduction port 14a. Similarly, the second inside / outside air switching door 15b has the second inside air introduction port 13b fully opened and the second outside air introduction port 14b fully closed. As a result, the outside air introduction amount is set to 0 and only the inside air is introduced into the inside / outside air switching box 2 (arrows FIa and FIb in the figure).

  FIG. 8B shows an operating state in the outside air mode, and the first inside / outside air switching door 15a has the first inside air introduction port 13a fully closed and the first outside air introduction port 14a fully opened. Similarly, the second inside / outside air switching door 15b has the second inside air introduction port 13b fully closed and the second outside air introduction port 14b fully opened. As a result, the inside air introduction amount is set to 0 and only outside air is introduced into the inside / outside air switching box 2 (arrows FOa and FOb in the figure).

  FIG. 8C shows an operating state in the inside air mode + partial outside air introduction mode. The first inside / outside air switching door 15a fully opens the first inside air introduction port 13a and fully closes the first outside air introduction port 14a. It is said. On the other hand, the second inside / outside air switching door 15b slightly opens the second outside air introduction port 14b so as to introduce a predetermined amount (necessary outside air introduction amount) of outside air into the inside / outside air switching box 2 from the second outside air introduction port 14b. The position is controlled. At this time, the second inside air introduction port 13b is almost fully open. As a result, a substantially maximum amount of inside air (arrows FIa and FIb in the figure) and a necessary amount of outside air (arrow FOb1 in the figure) are introduced into the inside / outside air switching box 2.

  By configuring as described above, the same effects as those of the first embodiment can be obtained also in the second embodiment.

(Other embodiments)
In the first embodiment, the sub door 7 is a plate door. However, the present invention is not limited to this. For example, as shown in FIG. 9, a film winding type door (film door) 11 may be used. As is well known, this film door 11 is provided with an opening 11b in a film 11 that closes the opening, and the film 11 is wound in both directions by winding and feeding shafts 11b and 11c that are driven and controlled by a servo motor. By sending it out, a part of the opening of the outside air inlet 4b is opened or closed.

  Further, the dust removing / deodorizing filter 12 may be arranged on the upstream side of the partial outside air introduction port 4b of the sub door 7 in the first embodiment so as to cover only the opening range of the partial outside air introduction port 4b. Thereby, dust and odor components can be efficiently removed from a predetermined amount of outside air partially introduced from the outside air inlet 4b. Further, since the dust removal / deodorization filter 12 is disposed on the upstream side of the sub door 7, the dust removal / deodorization filter 12 can be easily replaced.

  Further, in the first and second embodiments, the two switching doors (the rotary door 5 and the sub door 7, and the first inside / outside air switching door 15a and the second inside / outside air switching door 15b) are respectively connected to different servo motors 34a, 34b. However, the present invention is not limited to this. One door is operated by one servo motor, and the output of this servo motor is transmitted to the other door by a transmission mechanism such as a link. May be.

It is a figure which shows schematic structure of the air blower unit of 1st Embodiment. It is an electric control block diagram in a 1st embodiment. It is a figure which shows the operation state in the external air mode of 1st Embodiment. It is a figure which shows the operation state in the partial external air introduction mode of 1st Embodiment. It is a figure which shows the control characteristic of the partial external air introduction amount with respect to the external air dirt level in the partial external air introduction mode of 1st Embodiment. It is a figure which shows the control characteristic of the subdoor opening with respect to the vehicle speed in the partial external air introduction mode of 1st Embodiment. It is a figure which shows the example which measured the change of the carbon dioxide concentration in the vehicle interior in 1st Embodiment. It is a figure which shows the inside / outside air switching box of 2nd Embodiment, (a) shows the operating state in all the inside air modes, (b) shows the operating state in outside air mode, (c) is a partial outside air introduction mode. The operating state of is shown. It is a figure which shows the inside / outside air switching box of other embodiment. It is a figure which shows the inside / outside air switching box of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Blower unit, 2 ... Inside / outside air switching box, 3 ... Inside air introduction port, 4 ... Outside air introduction port,
4a ... main outside air introduction port, 4b ... some outside air introduction port, 5 ... rotary door (inside / outside air switching door),
6 ... Rotating shaft, 7 ... Sub door, 8 ... Rotating shaft, 9 ... Dust removal / deodorizing filter, 10 ... Blower.

Claims (10)

An inside air introduction port (3, 3b, 13a, 13b) that is arranged in the vehicle and introduces air inside the vehicle compartment and an outside air introduction port (4, 4a, 4b, 14a, 14b) that introduces air outside the vehicle compartment are provided. An inside / outside air switching box (2),
Inside / outside air switching means (5, 7, 11) disposed in the inside / outside air switching box and position-controlled to change the amount of inside air introduced from the inside air introduction port and the amount of outside air introduced from the outside air introduction port, Prepared,
The inside / outside air switching means fully closes the inside air introduction port during the outside air mode, fully opens the inside air introduction port during the inside air mode, and partially opens the outside air introduction port during the inside air mode to introduce a predetermined amount of outside air. The inside / outside air switching device is controlled to be in a partial outside air introduction mode. The outside air introduction port includes a partial outside air introduction port (4b) for partially introducing the outside air and a main outside air introduction port (4a),
The inside / outside air switching means includes a sub door (7) that opens and closes the partial outside air introduction port, and an inside / outside air switching door (5) that switches between opening and closing the inside air introduction port and the main outside air introduction port,
In the inside air mode, the inside / outside air switching door fully opens the inside air introduction port and fully closes the main outside air introduction port, and the sub door is positioned so as to introduce the predetermined amount of outside air from the partial outside air introduction port. The inside / outside air switching device according to claim 1, wherein the inside / outside air switching device is controlled. The inside air introduction port includes a partial inside air introduction port (3b) provided adjacent to the partial outside air introduction port, and the sub door switches between the partial outside air introduction port and the partial inside air introduction port. The inside / outside air switching device according to claim 2. The inside / outside air switching device according to claim 2 or 3, wherein the inside / outside air switching door and the sub door are respectively driven by individual actuators (34a, 34b). The inside / outside air switching device according to any one of claims 2 to 4, wherein the sub door includes a plate door. The inside / outside air switching device according to any one of claims 2 to 4, wherein the sub door includes a film door (11). The inside / outside air switching device according to any one of claims 2 to 6, further comprising a dust removing / deodorizing filter (12) upstream of the sub door at the partial outside air introduction port. The outside air introduction port includes a first outside air introduction port (14a) and a second outside air introduction port (14b), and the inside air introduction port includes a first inside air introduction port (13a) and a second inside air introduction port (13b). Prepared,
The inside / outside air switching means includes a first inside / outside air switching door (15a) that opens and closes the first outside air introduction port and the first inside air introduction port, the second outside air introduction port, and the second inside air introduction port. A second inside / outside air switching door (15b) for switching between opening and closing,
In the outside air mode, the first and second inside / outside air switching doors respectively close the first and second inside air introduction ports, and in the inside air mode, the first and second inside / outside air switching doors respectively The first and second inside air introduction ports are fully opened, and the position of at least one of the first and second inside / outside air switching doors is controlled so as to partially introduce the predetermined amount of outside air. Item 4. The inside / outside air switching device according to Item 1. An exhaust gas sensor (32a) for detecting the degree of contamination of the outside air;
9. The inside / outside air switching means is controlled so that the predetermined amount in the partial outside air introduction mode decreases as the degree of contamination of the detected outside air increases. The inside / outside air switching device according to any one of the above. A vehicle speed sensor (32b) for detecting the vehicle speed of the vehicle;
The inside / outside air switching means is controlled in accordance with the detected increase in vehicle speed so that the predetermined amount in the partial outside air introduction mode becomes a preset required outside air introduction amount. The inside / outside air switching device according to any one of 1 to 8.

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