JP3203729B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner.
In particular, the present invention relates to control of switching between inside and outside air of an automatic air conditioner.

[0002]

2. Description of the Related Art In an auto air conditioner conventionally used, a relative relationship between a target blow-out temperature calculated based on a vehicle interior set temperature, an inside air temperature, an outside air temperature and the like and an opening degree of an inside / outside air switching damper is shown. The characteristics are stored in the ECU,
The opening of the inside / outside air switching damper is determined based on this characteristic.

[0003] However, the above characteristics are made to satisfy general users, and not all users can satisfy them. For example, when the inside / outside air switching control is performed based on the above characteristics, the inside / outside air switching damper is switched to the inside air circulation side at the time of the low target blowout temperature, that is, at the time of the cool down control, so as to promote the cooling in the vehicle interior. However, in general, the noise generated when the inside / outside air switching damper is switched to the inside air circulation side is larger than the noise generated when the inside / outside air switching damper is switched to the outside air introduction side. So, depending on the user,
Even when the inside / outside air switching damper is switched to the inside air circulation side by the automatic control, there is also a case where the inside air / outside air switching damper is manually switched to the outside air introduction side from the viewpoint that noise prevention is given priority over vehicle interior cooling.

[0004] As described above, if there is a user who prioritizes the reduction of noise over the effectiveness of air conditioning in a vehicle, a user who prefers air conditioning in the vehicle even if the user can put up with a certain amount of noise. There are. In this way, taking into account the fact that the sound sensation and the cooling sensation are different for each user, if the user manually switches the inside and outside air while the inside and outside air switching control is being performed automatically, In order to match, it has become necessary to change the characteristics according to the user's manual setting.

[0005]

However, the manual setting of the inside / outside air switching damper is not always performed by the difference in taste between the sound and the cooling as described above. For example, even when switching to the outside air introduction side by auto, when traveling behind a truck that discharges a large amount of exhaust gas, the user should prevent the exhaust gas from entering the vehicle interior. It will be set manually to the inside air circulation side, and will also switch to the inside air circulation side when traveling in urban areas. In addition, even when the air is automatically switched to the inside air circulation side, when smoking indoors, the outside air introduction side will be set manually.

[0006] As described above, the manual setting of the inside / outside air switching damper at the time of running behind a truck, smoking indoors, and the like is not performed depending on the difference in user's taste of sound and cooling, so in such a case. If the characteristics are changed, there is a problem that the characteristics deviate from the taste of sound and cooling.

In view of the above problem, the present invention has been made in consideration of the above-mentioned problem. As a result of the manual setting of the inside / outside air switching performed by the user when the inside / outside air switching control is being performed automatically, the above-described characteristics are set to the user's taste and cooling sensation. It is an object of the present invention to provide a vehicle air conditioner that can be changed to characteristics suitable for the vehicle.

[0008]

In order to achieve the above object, the present invention provides an inside / outside air switching means for switching between introducing outside air or circulating inside air in a ventilation path of an air conditioner, A target control amount calculating means for calculating a target control amount of the inside / outside air switching means based on a condition affecting an air conditioning state; and an inside / outside air storing an inside / outside air characteristic of the inside / outside air switching means with respect to the target control amount. A characteristic storage unit, an inside / outside air determination unit that determines the inside / outside air switching of the inside / outside air switching unit based on the inside / outside air characteristics stored in the inside / outside air characteristic storage unit, and an inside / outside air switching unit of the inside / outside air switching unit. Inputting the signals from the inside / outside air manual setting means for manual setting, the inside / outside air determination means and the inside / outside air manual setting means, and controlling the driving of the inside / outside air switching means based on these signals. When the inside / outside air switching means is manually set by the inside / outside air manual setting means while the inside / outside air switching is being performed based on the inside / outside air characteristic, Inside / outside air characteristics changing means for changing the inside / outside air characteristics, inside / outside air switching means for detecting the inside air circulation condition to switch the inside / outside air switching means to the inside air circulation side; and The outside air introduction condition detecting means for detecting the outside air introduction condition to be switched to the side, and at least one of the inside air circulation condition and the outside air introduction condition are detected by the inside air circulation condition detection means and the outside air introduction condition detection means. When the manual setting is performed by the inside / outside air manual setting means, the inside / outside air characteristic change prohibition step is prohibited. The vehicle air conditioner provided with bets as its gist.

[0009]

In the present invention, the target control amount of the inside / outside air switching means is determined by the target control amount calculating means based on the condition affecting the air conditioning state, and the target control amount and the inside / outside air characteristic storage means are stored. The inside / outside air determination means determines the inside / outside air switching of the inside / outside air switching means from the inside / outside air characteristics. Then, based on the signal from the inside / outside air determination means and the signal from the inside / outside air manual setting means, the inside / outside air drive control means controls the drive of the inside / outside air switching means.

When the inside / outside air switching means is manually set by the inside / outside air manual setting means while the inside / outside air switching is being performed based on the inside / outside air characteristic, the inside / outside air characteristic changing means performs the manual setting. The inside / outside air characteristics are changed accordingly, but when at least one of the inside air circulation condition and the outside air introduction condition is detected by the inside air circulation condition detecting means and the outside air introduction condition detecting means, the inside / outside air characteristics are changed. Even if manual setting of the inside / outside air switching unit is performed while the inside / outside air switching is being performed based on the inside / outside air switching, the inside / outside air characteristic change prohibiting unit prohibits changing the inside / outside air characteristic according to the manual setting. .

[0011]

As described above, according to the present invention, when at least one of the inside air circulation condition and the outside air introduction condition is detected by the inside air circulation condition detection unit and the outside air introduction condition detection unit, the inside air / outside air condition is detected. Even if the switching unit is manually set, the inside / outside air characteristics are not changed, so that the inside / outside air characteristics can be changed to suit the user's taste of sound and cooling.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an automobile will be described below with reference to the drawings. As shown in FIG. 1, a passenger compartment 3 is provided upstream of the air conditioning duct 1 as a ventilation path of the air conditioner.
An inside air introduction port 2a for introducing inside air and an outside air introduction port 2b for introducing outside air into the vehicle interior 3 are formed. The inside air inlet 2a and the outside air inlet 2b are
It is opened / closed by an inside / outside air switching damper 5 serving as inside / outside air switching means driven by the motor 4.

Downstream of the inside / outside air switching damper 5, the inside air / outside air inlet 2a or the outside air inlet 2
A blower 6 is provided for introducing air from b and blowing the air into the passenger compartment 3 through the air conditioning duct 1.
The blower 6 is driven and controlled by a blower motor 7 driven by an externally applied voltage.

An evaporator 8 is provided downstream of the blower 6. The evaporator 8 forms a refrigeration cycle together with the compressor 9, a condenser and a pressure reducer (not shown), and absorbs heat from the air around the evaporator 8 when the refrigerant circulating through the refrigeration cycle flows inside the evaporator 8. This is a heat exchanger that cools and dehumidifies air. Immediately downstream of the evaporator 8, an after-evaporator temperature sensor 10 for detecting the temperature of air after passing through the evaporator 8 is provided.
The magnet clutch 11 connected to the compressor 9 is turned on and off by the post-evaporator temperature detected by the post-evaporator temperature sensor 10.

Downstream of the evaporator 8, a heater core 12 is provided.
Are arranged. The heater core 12 is connected to the engine via a pipe (not shown), and is a heat exchanger that heats air using engine cooling water flowing through the pipe as a heat source. The amount of engine cooling water flowing into the heater core 12 is adjusted by the degree of opening of the water valve 13, whereby the air heating capacity of the heater core 12 is adjusted.

Whether the air cooled and dehumidified by the evaporator 8 is heated through the heater core 12 or passes through the heater core bypass passage 14 is adjusted by the opening degree of the air mix damper 15. The air mix damper 15 is driven by an air mix servo motor 16. A potentiometer 17 is connected to the air mix servo motor 16 to detect the degree of opening of the air mix damper 15.

The air whose temperature is controlled by the heater core 12 and the heater core bypass passage 14 is blown out from a face outlet (not shown) toward the upper body of the occupant in the passenger compartment, blows out from the foot outlet to the foot of the occupant, or is defrosted. It is blown out from the outlet toward the windshield. The amount of air blown out from the face air outlet and the foot air outlet into the vehicle interior is adjusted by the opening of the air outlet switching damper 18 disposed downstream of the heater core 12. The outlet switching damper 18 is driven by an outlet servomotor 19.

Inside the cabin 3, an internal air temperature sensor 20 for detecting the air temperature in the cabin 3, a solar radiation sensor 21 for detecting the amount of solar radiation entering the cabin 3, and a set temperature in the cabin 3 Is set. Outside the vehicle compartment 3, an outside air temperature sensor 22 for detecting an outside air temperature and a water temperature sensor 23 for detecting an engine cooling water temperature are provided. The microcomputer 25 receives a signal from the post-evaporator temperature sensor 10 and a signal from the potentiometer 17 in addition to the signals from the sensors 20 to 23 and the signal from the temperature setting unit 24. A predetermined calculation is performed based on these signals, and based on the calculation result, the inside / outside air servo motor 4, the blower motor 7, the magnet clutch 11, the water valve 13, the air mix servo motor 16, and the blower. Exit servo
The control signal is output to the data 19.

Next, a control panel for manually setting the air conditioning in the passenger compartment will be described with reference to FIG. FIG.
The middle 26 is a control panel for the passenger in the vehicle compartment to manually control the air conditioning in the vehicle compartment, and is disposed on the dashboard in the center of the vehicle compartment.

At a substantially central portion of the control panel 26, there is provided an inside / outside air changeover switch 27 as an inside / outside air manual setting means comprising an outside air introduction designation switch 27a and an inside air circulation designation switch 27b. When the outside air introduction designating switch 27a is pressed, the fluorescent portion 270a is turned on, and the inside / outside air switching damper 5 (FIG. 1) opens the inside air introduction port 2a and closes the outside air introduction port 2b. When the inside air circulation designation switch 27b is pressed, the fluorescent portion 270b is turned on, and the inside / outside air switching damper 5 closes the inside air inlet 2a and opens the outside air inlet 2b. When the inside / outside air switching damper 5 is controlled automatically, the fluorescent unit 270b is turned on when the opening degree of the inside / outside air switching damper 5 is 100% inside air circulation side at that time, and otherwise, the fluorescent unit 270b is turned on. 270a lights up.

The temperature setting unit 24 described above is provided on the right side of the inside / outside air changeover switch 27 in FIG. The temperature setting device 24 includes an up switch 24a and a down switch 24b. By operating these switches 24a and 24b, the set temperature can be set between 18 ° C and 32 ° C. The set temperature set by the temperature setter 24 is digitally displayed on the set temperature display unit 28. FIG. 2 shows a case where the set temperature is 25 ° C.

Among the eight switches provided on the left side in FIG. 2, reference numeral 29 denotes an air conditioner switch for manually designating ON / OFF of the magnet clutch 11 (FIG. 1). When the air conditioner switch 29 is operated to turn on the magnet clutch 11, the fluorescent portion 29a is turned on. At this time, the air dehumidified by the evaporator 8 is blown into the vehicle interior. When the magnet clutch 11 is turned off by operating the air conditioner switch 29, the fluorescent unit 2
9a is turned off, and at this time, the dehumidified air is not blown.

On the right side of the air conditioner switch 29 in FIG.
Three blower switches 30a, 30b and 30c for manually setting the voltage applied to the blower motor 7 (FIG. 1) are provided. Among these switches, the blower switch 30a has a minimum airflow amount (L
o) A switch for applying a voltage to the blower motor 7 so as to have an air volume, the blower switch 30b is a switch for applying a voltage to the blower motor 7 so that the blown air volume is an intermediate (Me) air volume, and a blower switch 30c. This is a switch for applying a voltage to the blower motor 7 so that the blown air amount becomes the maximum (Hi) air amount. When these blower switches are manually operated, the fluorescent parts 300a to 300c are illuminated so that the occupant can be recognized.

In the lower portion of the air conditioner switch 29 and the blower switches 30a to 30c in FIG.
a to 31d are provided. Among these switches, the blow mode switch 31a is a switch for designating a face mode, the blow mode switch 31b is a switch for designating a bi-level mode, the blow mode switch 31c is a switch for designating a foot mode, and a blow mode. The changeover switch 31d is a switch for designating a foot differential mode. When these blow-out mode changeover switches are manually operated, the fluorescent unit 31
The occupants are made aware by lighting 0a to 310d.

On the right side of the control panel 26 in FIG. 2, there is provided a defroster switch 32 for clearing the fogging of the windshield, and this operating condition can be recognized by whether the fluorescent section 32a is lit or not. Further, a rear defogger switch 33 for clearing rear glass fogging is provided on the right side of the defroster switch 32, and this operation state can be recognized by whether or not the fluorescent section 33a is turned on.

In FIG. 2, reference numeral 34 denotes an inside / outside air servo motor 4, a blower motor 7, a magnet clutch 11, an air mix servo motor 16, and an air outlet servo motor 1.
9 is an auto switch for automatically controlling the fluorescent lamp 9. When these switches are in the automatic control operation, the fluorescent part 34 a is lit. Reference numeral 35 denotes an off switch for setting the voltage applied to the blower motor 7 to 0 and for turning off the magnet clutch 11. When the off switch 35 is operated, the fluorescent portion 34a is turned off.

Next, a control process in the microcomputer 25 will be described with reference to a flowchart shown in FIG. First, at step 100, the internal temperature TR and the set temperature T
SET, outside air temperature TAM, solar radiation TS, engine cooling water temperature TW, and post-evaporator temperature TE are input.

Next, in step 101, step 100
A target blowing temperature (hereinafter referred to as TAO, the unit of which is ° C.) is obtained from the following equation 1 based on the data input in step (1). In one embodiment, the above TAO is used as the target control amount of the inside / outside air switching means, and the target control amount calculation means is configured in step 101.

[0029]

## EQU00001 ## TAO = KSET.times.TSET-KR.times.TR-KAM.times.TAM-KS.times.TS + C Next, in step 102, based on the data input in step 100, the air mix damper 1
5 is determined. The unit of SW is%.

[0030]

[Mathematical formula-see original document] SW = (TAO-TE) * 100 / (TW-TE) Next, in step 103, the T calculated in step 101 is calculated.
The blower voltage BLW to be applied to the blower motor 7 is determined from AO according to the relative characteristics between TAO and the blower voltage stored in the microcomputer 25 in advance.

Next, at step 104, the inside / outside air switching damper 5 is read from the TAO according to the inside / outside air characteristic indicating the relationship between the TAO previously stored in the ROM in the microcomputer 25 and the opening degree of the inside / outside air switching damper 5. Of opening S
Determine WI. Here, in one embodiment, when TAO is low, it is possible to efficiently cool the interior of the vehicle by cooling the inside air having a slightly lower temperature than by cooling by introducing hot air outside the vehicle, The inside / outside air characteristics are created so that the inside / outside air switching damper 5 is switched to the inside air circulation side. Further, after that, when the inside of the vehicle is cooled to some extent and the TAO becomes high, the inside / outside air characteristics are created so that the inside / outside air switching damper 5 is switched to the outside air introduction side in order to introduce clean air into the vehicle interior. are doing. In one embodiment, the RO in the microcomputer 25 is
M constitutes the inside / outside air characteristic storage means, and step 1
04 constitutes inside / outside air determination means.

Next, at step 105, the outlet mode is determined from the TAO according to the relative characteristics between the TAO and the outlet mode stored in the microcomputer 25 in advance. Here, in one embodiment, when the TAO is low, a face mode in which air is blown out from the face outlet is set, and as the TAO becomes higher, a bi-level (B / B) in which air is blown out from the face outlet and the foot outlet.
The above characteristics are created so as to be the L) mode and the foot mode in which air is blown out from the foot outlet.

Next, at step 106, it is determined whether the magnet clutch 11 is to be turned on or off based on the characteristic indicating the on / off state of the magnet clutch 11 with respect to the deviation between the outside air temperature TAM and the above-mentioned TAO.

Next, in step 107, the above step 1
A control signal is output to each actuator in accordance with the blower voltage BLW applied to the blower motor 7 determined in steps 02 through 106, the opening degree SWI of the inside / outside air switching damper 5, the blowing mode, and the on / off state of the magnet clutch.

Next, control when the inside / outside air switching damper 5 (FIG. 1) is manually set by the inside / outside air switching switch 27 (FIG. 2) will be described with reference to FIGS.
Here, FIG. 4 is an inside / outside air characteristic diagram showing a relative relationship between TAO used in step 104 and the opening degree SWI of the inside / outside air switching damper 5, and FIGS.
5 is a flowchart showing the control processing of FIG.

When the ignition key is turned on to control the inside / outside air switching damper 5 based on the flowchart shown in FIG. 5, a flag FAUTO indicating an automatic control state is set.
FREC, which indicates the opening degree of the inside / outside air switching damper 5, a flag M, which indicates whether the inside / outside air switching damper 5 has shifted from the automatic control to the manual control, an inside air circulation side counter COUNTR, and an outside air introduction side counter COUNTF, are respectively FAUTO.
= 1, FREC = 0, M = 0, COUNTF = 0, and COUNTR = 0.

First, after the ignition key is turned on, an auto (AUTO) switch 34 (FIG. 2), an outside air introduction designation (FRS) switch 27a (FIG. 2), and an inside air circulation designation (REC) switch 27b (FIG. 2) are turned on. A first case in which all operations are not performed will be described.

For the first case in one embodiment,
NO is determined in steps 501, 502, and 503 in FIG. 5, and the control in step 520 in FIG. 6 is executed.

Since FAUTO is initially set to FAUTO = 1, YES is determined in step 520. Next, at step 524, the process of step 104 of FIG. 3 is performed. That is, the opening degree SWI of the inside / outside air switching damper 5 is determined based on the inside / outside air characteristics shown in FIG. In step 525, a control signal is output to the inside / outside air servomotor 4 so that the opening of the inside / outside air switching damper 5 becomes the opening SWI determined in step 524. In one embodiment, the inside / outside air drive control means is configured in step 525.

Next, a second case in which the occupant operates the outside air introduction designating switch 27a while the inside / outside air switching damper 5 is being automatically controlled in the first case will be described. In the second case, that is, the value of TAO in FIG.
When the outside air introduction designating switch 27a is operated in the range of AOA, NO is determined in step 501, and YES is determined in step 502.

Since the automatic control state of the inside / outside air switching damper 5 has been released when the outside air introduction designating switch 27a is operated, the flag FAUTO indicating the automatic control state is set to 0 in the next step 505. Operating the outside air introduction designating switch 27a means that a signal for instructing the opening degree SWI of the inside / outside air switching damper 5 to be 100% (see FIG. 4) is sent. I do.

Next, at step 508, it is determined whether or not the inside / outside air switching damper 5 was previously controlled automatically. Here, if the previous automatic control was performed, the flag M is 0, so that the determination is YES, and the value of the outside air introduction side counter COUNTF is incremented by one in step 509. In the second case, COUNTF = 0 + 1 = 1 because the previous automatic control is performed and the process of step 509 is performed for the first time. Then, at step 510, the flag M is set to M = 1.

Next, at step 515, at step 509
The value of the outside air introduction side counter COUNTF obtained in the above, COUNTF and the TAOA correction amount (ΔTA
ΔTAOA is calculated from the relative characteristics of the OA). As shown in step 515 of FIG.
While the value of COUNTF is small, the value of ΔTAOA is reduced, and when the value of COUNTF becomes large, ΔTAOA
It is created as a sigmoid function that suddenly increases the value of.

Next, the control processing of step 517 shown in FIG. 6 is executed, which will be described with reference to FIG. In step 517, the control processing shown in FIG. 7 is specifically performed. That is, in steps 601 to 604, it is determined whether or not the smoke concentration in the vehicle compartment detected by the smoke sensor 36 (see FIG. 8) is equal to or higher than a predetermined value C1, and the amount of exhaust gas detected by the exhaust gas sensor 37 (see FIG. 8). Is greater than or equal to a predetermined value C2, whether or not the defroster switch 32 is on, and whether or not a value S (A) indicating the degree of vehicle speed change is greater than or equal to a predetermined value C3. Here, the value S (A) indicating the degree of the change in the vehicle speed can be obtained by the following equation 3 from the value obtained by adding the magnitude of the difference between the average vehicle speed v (A) and the instantaneous vehicle speed vi.

[0045]

S (A) = Σ | vi−v (A) | If it is determined in step 601 that the smoke density is equal to or higher than the predetermined value C1, the inside / outside air switching damper 5 is switched to the outside air introduction side. If it is determined in step 602 that the amount of exhaust gas is equal to or more than the predetermined value C2, it should be switched to the inside air circulation side. When the defroster switch 32 is turned on, it should be switched to the outside air introduction side.

A value S (A) indicating the degree of vehicle speed change
Is determined to be equal to or greater than the predetermined value C3, it should be switched to the inside air circulation side. This is because the larger the value of S (A), the more frequently the vehicle speed changes, which means that the vehicle is traveling in an urban area. Since the outside of the city is generally dirty, the inside / outside air switching damper 5 should be switched to the inside air circulation side when traveling in the city.

Steps 601 to 604
If YES is determined in any one of the steps, α = 0 is set in step 605, and the process proceeds to step 519 in FIG. 6 to prohibit the change of the inside / outside air characteristic (FIG. 4). That is, in one embodiment, the inside / outside air characteristic change prohibiting means is configured in step 605. This will be described later in the description of step 519.

Steps 601 to 6
When NO is determined in all steps of step 04, α = 1 is set in step 606, and the process proceeds to step 519 in FIG. That is, the inside / outside air characteristics (FIG. 4) are changed.

As described above, in one embodiment,
The internal air circulation condition detecting means is connected to the exhaust gas sensor 37 and S
(A) (means for urban area travel detection means). The outside air introduction condition detecting means is constituted by the smoke sensor 36 and the defroster switch 32. The internal air circulation conditions include a case where the exhaust gas amount is equal to or more than a predetermined value C2 and a case where S (A) is equal to or more than a predetermined value C3. The outside air introduction conditions include a case where the smoke density is equal to or higher than the predetermined value C1 and a case where the defroster switch 32 is turned on.

When α is determined in the manner described above in step 517, the α and step 51 are determined in step 519.
5 based on ΔTAOA determined in FIG.
The position of the point is shifted so as to be TAOA determined by the following equation (4).

[0051]

## EQU4 ## TAOA = TAOA-α × ΔTAOA That is, if α obtained in step 517 is 1,
TAOA obtained in step 519 is TAOA−ΔTA
OA, and the position of the point A is shifted to the left in FIG. 4 by ΔTAOA.

By shifting the position of the point A to the left in FIG. 4, the range of TAO for maintaining the opening degree SWI of the inside / outside air switching damper 5 at 0% becomes narrow, and as a result, the position of the point A is shifted. Compared to before, it will start to switch to the outside air introduction side earlier. In other words, the point at which SWI> 0% is earlier, and the characteristics are changed to suit the taste of the occupant who has manually switched to the outside air introduction side during the internal air circulation control by the automatic control. In one embodiment, the characteristics changed by the manual setting are the same as those in the microcomputer 25.
Stored in AM.

Also, α obtained in step 517 is 0
In the case of, the TAOA obtained in step 519 is TAO
A is set, and the position of point A is not changed. That is, even if the inside / outside air switching damper 5 is manually switched to the outside air introduction side during the automatic control, if the inside air circulation condition or the outside air introduction condition is detected as described above and α is determined to be 0, the inside / outside air characteristic is determined. (FIG. 4) is not changed.

Next, at step 520, it is determined whether or not the flag FAUTO indicating the automatic control state is "1". That is, it is determined whether the automatic control is currently being performed. However, in the second case currently described, at step 505 FAUTO =
Since 0 and FREC = 1 have been set, step 52
If it is 0, it is determined as NO.

Since FREC = 1, YES is determined in step 521, and in step 523, the opening degree SWI of the inside / outside air switching damper 5 is determined to be 100%.
That is, it is determined to switch to the outside air introduction side. In step 525, a control signal is output to the inside / outside air servomotor 4 so that the opening degree SWI becomes 100%.

In the second case in one embodiment, the inside / outside air characteristic changing means is constituted by steps 509, 515 and 519. Next, after the control in the second case has been completed and the control is returned, the auto switch 34, the outside air introduction designating switch 27
a and the third case in which all of the inside air circulation designation switches 27b are not operated.

In the third case, as in the first case, NO is determined in all of steps 501 to 503. Then, in step 520, F
Since AUTO = 0, the determination is NO, and in Step 521, the determination is YES since FREC = 1. Then, in steps 523 and 525, the opening degree of the inside / outside air switching damper 5 is determined to be 100% (outside air introduction side), and a control signal is output to the inside / outside air servo motor 4.

Thereafter, as long as the switches 34, 27a and 27b are not operated, the same control as in the third case is executed. Next, a fourth case in which the occupant operates the inside air circulation designation switch 27b while the inside / outside air switching damper 5 is in automatic control will be described.

In the fourth case, that is, when the value of TAO in FIG.
Inside air circulation designation switch 2 when AO> TAOA
7a is operated, steps 501 and 5
02 is determined as NO, and step 503 is determined as YES.

Since the automatic control state of the inside / outside air switching damper 5 has been released when the inside air circulation designating switch 27b is operated, the flag FAUTO indicating the automatic control state is set to 0 in the next step 506. Operating the inside air circulation designating switch 27b means that a signal for instructing the opening degree SWI of the inside / outside air switching damper 5 to be 0% (see FIG. 4) is sent, so that the flag FREC is set to 0. I do.

Next, at step 511, it is determined whether or not the inside / outside air switching damper 5 was previously controlled automatically. If the control was previously automatic, the flag M is 0, so that the determination is YES, and the value of the inside air circulation side counter COUNTR is incremented by one in step 512. In the fourth case, the value of COUNTR is incremented by one because the automatic control was previously performed. Then, at step 513, the flag M is set to M = 1.

Next, at step 514, step 509 is executed.
The value of the inside air circulation side counter COUNTR obtained in the above, and the previously stored COUNTR and TAOB correction amount (ΔTA
ΔTAOB is determined from the relative characteristics of the signal and OB). As shown in step 514 in FIG.
In the second case, the sigmoid function is created as described above.

Next, in the control processing of step 516 shown in FIG. 6, the value of α is obtained according to the flowchart shown in FIG. 7, similarly to the processing of step 517 described above in the second case. In step 516, when α is determined in the manner described above, in step 518, the position of point B shown in FIG. 4 is calculated based on the α and ΔTAOB determined in step 514 by TAOB obtained by the following equation (5). Stagger so that

[0064]

## EQU5 ## TAOB = TAOB + α × ΔTAOB That is, when α obtained in step 516 is 1,
TAOB obtained in step 518 is TAOB + ΔTA
OB, and the position of point B is shifted to the right in FIG. 4 by ΔTAOB.

By shifting the position of point B to the right in FIG. 4, the range of TAO for maintaining the opening degree SWI of the inside / outside air switching damper 5 at 100% becomes narrow, and as a result, the position of point B is shifted. Compared with the previous time, the point of switching to 100% outside air introduction is delayed. In other words, the range of the TAO for containing the inside air component is widened, and the characteristics are changed to the characteristics suitable for the occupant who manually switched to the inside air circulation side during the outside air introduction control by the automatic control.

Also, α obtained in step 516 is 0
In the case of, TAOB obtained in step 518 is equal to TAO
It becomes B, and the position of point B is not changed. That is, even if the inside / outside air switching damper 5 is manually switched to the inside air circulation side during the automatic control, if the inside air circulation condition or the outside air introduction condition is detected and α is determined to be 0 as described above, the inside / outside air characteristic is determined. (FIG. 4) is not changed.

Next, at step 520, it is determined whether or not a flag FAUTO indicating the automatic control state is "1". That is, it is determined whether the automatic control is currently being performed. However, in the fourth case currently described, at step 506 FAUTO =
Since 0 and FREC = 0 have been set, step 52
If it is 0, it is determined as NO.

Since FREC = 0, it is also determined NO in step 521, and in step 522, the opening degree SWI of the inside / outside air switching damper 5 is determined to be 0%. That is, it is determined to switch to the inside air circulation side. Then, at step 525, a control signal is output to the inside / outside air servomotor 4 so that the opening degree SWI = 0%.

In the fourth case of the above embodiment, the inside / outside air characteristic changing means is constituted by steps 512, 514, and 518. Next, a description will be given of a fifth case in which the auto switch 34, the outside air introduction designating switch 27a, and the inside air circulation designating switch 27b are all not operated after the control in the fourth case has been completed and the process returns.

In the fifth case, as in the first and third cases, steps 501 to 50
No. 3 is determined as NO. In step 520, NO is determined because FAUTO = 0, and in step 521, NO is determined because FREC = 0. Then, in steps 522 and 525, the opening degree of the inside / outside air switching damper 5 is determined to be 0% (inside air circulation side), and a control signal is output to the inside / outside air servo motor 4.

Thereafter, as long as the switches 34, 27a and 27b are not operated, the same control as in the fifth case is executed. Next, a sixth case in which the inside air circulation designation switch 27b is pressed while the inside / outside air switching damper 5 is being controlled on the outside air introduction side by the outside air introduction designation switch 27a will be described.

In the sixth case, NO is determined in steps 501 and 502, and YE is determined in step 503.
S is determined. Then, in step 506, FAUTO = 0.
FREC = 0 is set.

In the next step 511, the state of the flag M indicating whether or not the inside / outside air switching damper 5 has shifted from the automatic control to the manual control is determined. In the sixth case, the control is shifted from the manual control to the manual control, that is, since M = 1, step 5
In No. 11, the determination is NO, and the process proceeds to Step 513 without performing the process of Step 512, and M = 1 is maintained.

At step 514, the value of the counter COUNTR currently stored, that is, at the previous step 512
ΔTAO from the value of COUNTR when the process of
B is determined.

Then, at step 516, α is determined.
If α = 0, in step 518, TAOB = TAOB. That is, the position of the point B of the inside / outside air characteristic is not the position changed by the processing so far, but is the position indicated by the point B in FIG. If α = 1, TAOB = TAOB + ΔTAOB at step 518, and the position of point B in the inside / outside air characteristics is the position changed by the processing up to this point.

At step 506, FAUTO = 0 and FREC
Since = 0 has been set, NO is determined in the next steps 520 and 521, and the opening of the inside / outside air switching damper 5 is determined to be SWI = 0% in step 522. Then, in step 525, a control signal is output to the inside / outside air servo motor 4.

Next, a description will be given of a seventh case in which the outside air introduction designating switch 27a is pressed while the inside / outside air switching damper 5 is being controlled on the inside air circulation side by the inside air circulation designating switch 27b.

In the seventh case, NO is determined in step 501, and YES is determined in step 502. Then, in step 505, FAUTO = 0 and FREC = 1 are set.

In the next step 508, the state of the flag M indicating whether or not the inside / outside air switching damper 5 has shifted from the automatic control to the manual control is determined. In the seventh case, since the control is shifted from the manual control to the manual control, that is, M = 1, step 5
At 08, the determination is NO, and the process proceeds to step 510 without performing the process of step 509, and M = 1 is maintained.

In step 515, the value of the currently stored counter COUNTF, that is,
ΔTAO from the value of COUNTF when the process of
A is determined.

Then, in step 517, α is determined.
If α = 0, in step 519, TAOA = TAOA. In other words, the position of the point A in the inside / outside air characteristic is not the position changed by the processing so far, but the position indicated by the point A in FIG. If α = 1, TAOA = TAOA + ΔTAOA at step 519, and the position of point A in the inside / outside air characteristic is the position changed by the processing up to this point.

At step 505, FAUTO = 0 and FREC
= 1, so that N
O is determined, and YES is determined in Step 521. Then, in step 522, the opening degree of the inside / outside air switching damper 5 is determined to be SWI = 100%, and in step 525, a control signal is output to the inside / outside air servo motor 4.

Next, an eighth case in which the auto switch 34 is pressed while the inside / outside air switching damper 5 is being manually controlled by the outside air introduction designating switch 27a or the inside air circulation designating switch 27b will be described.

In the eighth case, YES is determined in step 501, and FAUTO = 1 and FREC = 0 in step 504.
Is set to Then, at step 507, the flag M = 0.
Set to.

Thereafter, YES is determined in step 520, and in the next step 524, the opening degree SWI of the inside / outside air switching damper 5 is determined based on the TAO and the inside / outside air characteristic obtained in step 101 (FIG. 3). It is determined. Note that the inside / outside air characteristics used at this time are characteristics in which the positions of the points A and B have been changed by the processing up to this point. Then, at step 525, a control signal is output to the inside / outside air servomotor.

As described above in detail, in the above-described embodiment, when the smoke concentration is equal to or higher than the predetermined value, when the exhaust gas amount is equal to or higher than the predetermined value, and when traveling in the city, the inside / outside air switching is controlled automatically. Since the inside / outside air characteristics are not changed even if the damper 5 is manually switched, the occupant takes no care to change the inside / outside air characteristics stored in the microcomputer to characteristics suitable for his / her own sound and cooling feeling. Without pressing the manual setting switch, the characteristics can be changed to suit the sound and cooling feeling of the user.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire configuration of an embodiment of the present invention.

FIG. 2 is a front view of a control panel used in the embodiment.

FIG. 3 is a flowchart showing a control process of a microcomputer used in the embodiment.

FIG. 4 is an inside / outside air characteristic diagram used in the embodiment.

FIG. 5 is a flowchart showing a control process of an inside / outside air switching damper used in the embodiment.

FIG. 6 is a flowchart showing a control process of an inside / outside air switching damper used in the embodiment.

FIG. 7 is a flowchart showing a control process in steps 516 and 517 of FIG. 6;

FIG. 8 is a perspective view showing a position where the smoke sensor and the exhaust gas sensor used in the embodiment are mounted on the vehicle body.

FIG. 9 is a diagram corresponding to claims of the present invention.

[Explanation of symbols]

1 Air-conditioning duct as ventilation path 5 Inside / outside air switching damper as inside / outside air switching means 25 Microcomputer 27 Inside / outside air switching switch as inside / outside air manual setting means 36 Smoke sensor as outside air introduction condition detecting means 37 Inside air circulation condition detecting means Exhaust gas sensor of Step 101 Target control amount calculation means Step 104 Inside / outside air determination means Step 525 Inside / outside air drive control means Step 509, Step 515, Step 519, Step 512, Step 514, Step 518 Inside / outside air characteristic changing means Step 605 Inside / outside air characteristics Change prohibition means

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Ito 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (72) Inventor Katsuhiko Samugawa 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Nihon Denso Co., Ltd. (72) Inventor Tomohisa Yoshimi 1-1-1 Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (58) Field surveyed (Int.Cl. ⁷ , DB name) B60H 1/00 103 B60H 1/24 661

Claims (1)

(57) [Claims] 1. An inside / outside air switching unit for switching between introducing outside air or circulating inside air into a ventilation path of an air conditioner, and the inside / outside air switching unit based on a condition affecting an air conditioning state in the vehicle compartment. A target control amount calculating means for calculating the target control amount of the inside and outside air characteristic storing means for storing the inside and outside air characteristics of the inside and outside air switching means with respect to the target control amount; Inside / outside air determination means for determining inside / outside air switching of the inside / outside air switching means based on inside / outside air characteristics, inside / outside air manual setting means for manually setting inside / outside air switching of the inside / outside air switching means, An internal / external air drive control unit for inputting each signal from the determination unit and the internal / external air manual setting unit, and performing drive control of the internal / external air switching unit based on these signals; and When the inside / outside air switching means is manually set by the inside / outside air switching means while the inside / outside air switching is being performed, the inside / outside air characteristic changing means for changing the inside / outside air characteristic according to the manual setting. And an inside air circulation condition detecting means for detecting an inside air circulation condition to switch the inside / outside air switching means to the inside air circulation side; and an outside air introduction condition for detecting an outside air introduction condition to switch the inside / outside air switching means to the outside air introduction side. Detecting means, when at least one of the inside air circulation condition and the outside air introduction condition is detected by the inside air circulation condition detecting means and the outside air introduction condition detecting means, the manual operation by the inside / outside air manual setting means is performed. An air conditioner for a vehicle, comprising: an inside / outside air characteristic change prohibiting unit that prohibits a change in the inside / outside air characteristic even if the setting is performed.