JP2003326938A - Air-conditioning defogging control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To alleviate drying inside a cabin with a low-cost constitution without mounting a humidifier exclusively for humidification and to enable defogging effect on a windshield. <P>SOLUTION: In a vehicle provided with an electric heating element for directly heating the windshield of the vehicle, an air-conditioning unit for blowing out a conditioned air into the cabin, and an indoor/outdoor air switching door for switching an intake mode of air to be taken into the air-conditioning unit are provided, it is determined whether humidity inside the cabin is lower than a comfortable range or not (S20), and when it is determined that the humidity in the cabin is lower than the comfortable range, the indoor/outdoor air switching door is set to an indoor air mode (S40). In the meantime, fog on the windshield of the vehicle is determined (S60), and when the fog on the windshield of the vehicle is determined, the electric heating element is electrified (S70). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular air-conditioning anti-fog control device that achieves both prevention of drying by controlling humidity in a vehicle interior and ensuring of anti-fog property of window glass.

[0002]

2. Description of the Related Art Conventionally, humidity control in a vehicle compartment is generally only dehumidification by a cooling heat exchanger of an air conditioner. By the way, in the winter season, the temperature of the vehicle window glass is lowered and the vehicle window glass is easily fogged, so that the outside air mode is selected as the air suction mode of the air conditioner.

However, in winter, the atmosphere is dry and the absolute humidity of the atmosphere is reduced. In addition, when the outside air mode is selected as the air intake mode when heating the passenger compartment,
Since the low-humidity outside air is heated for heating, the relative humidity of the air blown into the vehicle interior is significantly reduced. For this reason, when a passenger rides for a long time in winter, the passengers often suffer from symptoms such as dry eyes and sore throat.

Therefore, Japanese Utility Model Laid-Open No. 63-148512 discloses a humidifier for humidifying the vehicle interior and an electric heating element for heating the window glass of the vehicle. When the vehicle interior dries, the humidifier is operated to activate the vehicle. It has been proposed to prevent the fogging of the vehicle window glass by heating the electric power of the vehicle window glass and simultaneously raising the temperature of the vehicle window glass while humidifying the room.

[0005]

However, with the conventional technique, it is necessary to additionally install a humidifier dedicated to humidification, which leads to an increase in cost and a difficulty in securing a space for mounting the humidifier. is there.

In view of the above points, the present invention can alleviate the drying of the passenger compartment with a low-cost structure without mounting a humidifier exclusively for humidifying, and at the same time, exhibit the antifogging effect of the vehicle window glass. The purpose is to be able to.

[0007]

In order to achieve the above object, according to the invention as set forth in claim 1, in a vehicle provided with an electric heating element (61) for directly heating a vehicle window glass (W), air-conditioned wind is applied to the vehicle. An air conditioning unit (1) that blows out indoors,
An inside / outside air switching unit (6) for switching the suction mode of the air sucked into the air conditioning unit (1) and a comfort determining unit (S2) for determining whether or not the humidity in the vehicle compartment is lower than the comfortable range.
0) and when the comfort determining means (S20) determines that the humidity in the vehicle compartment is lower than the comfortable range, the inside / outside air control means (S40) sets the inside / outside air switching means (6) to the inhalation mode mainly for inside air. ), A fogging determination means (S60) for determining fogging of the vehicle window glass (W), and a fogging determination means (S60)
Is provided with an energization control means (S70) for energizing the electric heating element (61) when it is determined that the vehicle window glass (W) is clouded.

Thus, when the humidity in the vehicle compartment is lower than the comfortable range, the inhalation mode mainly for the inside air is automatically set,
The moisture released from the occupant can be used to raise the humidity in the passenger compartment to a comfortable range. Therefore, it is possible to alleviate the dry state of the vehicle interior due to the blowing of low-humidity outside temperature air in the winter, and to prevent symptoms such as dry eyes and sore throat of the occupant.

Moreover, without mounting a humidifier exclusively for humidification,
It has a great practical effect of being able to reduce the dryness of the vehicle interior with a low-cost configuration.

By the way, since the temperature of the vehicle window glass is low in the winter, when the humidity in the vehicle interior increases due to the air conditioning of the vehicle interior by circulating the inside air, the vehicle interior air is cooled by the vehicle window glass (W) and the vehicle window glass (W). ) Is apt to occur, but according to claim 1, a fog determination means (S60) for determining the fogging of the vehicle window glass (W) is provided, and when the fogging of the vehicle window glass (W) is determined, electric heat is generated. Since the body (61) is energized, the temperature of the vehicle window glass can be raised above the dew point of the vehicle interior air by the heat generation of the electric heating element (61), and the vehicle window glass (W) can be prevented from fogging.

Moreover, since the electric heating element (61) is energized only when the fogging determination means (S60) determines the fogging of the vehicle window glass (W), the electric power consumption of the electric heating element (61) is minimized. Can be suppressed to

According to the invention described in claim 2, claim 1
In the above, the fogging determining means (S60) can determine the fogging of the vehicle window glass (W) based on at least the humidity inside the vehicle compartment and the vehicle window glass temperature.

According to a third aspect of the present invention, in a vehicle including an electric heating element (61) for directly heating the window glass (W) of the vehicle, an air conditioning unit (1) for blowing air conditioning air into the passenger compartment, and the air conditioning unit. (1) Inside / outside air switching means (6) for switching the intake mode of the air taken in, comfort determining means (S20) for determining whether the humidity in the vehicle compartment is lower than the comfortable range, and comfort determining means When it is determined in (S20) that the humidity in the vehicle compartment is lower than the comfortable range,
The inside / outside air control means (S40) for setting the inside / outside air switching means (6) to the intake mode mainly for the inside air, and the humidity in the vicinity of the vehicle window glass are calculated based on the humidity in the vehicle compartment and the vehicle window glass temperature, and the vehicle window Anti-fog control means (S for controlling the energization of the electric heating element (61) so that the humidity near the glass becomes a predetermined value or less (S
60, S70).

As a result, similarly to the first aspect, when the humidity inside the vehicle compartment is lower than the comfortable range, the inhalation mode mainly for the inside air is automatically set, and the moisture released from the occupant is used to make the inside of the vehicle compartment. Humidity can be raised to a comfortable range.

Further, since the energization of the electric heating element (61) is controlled so that the humidity in the vicinity of the window glass of the vehicle becomes a predetermined value or less, even if the intake mode mainly for the inside air is set in order to prevent the vehicle interior from drying, It is possible to reliably prevent fogging of vehicle window glass.

According to the fourth aspect of the present invention, in a vehicle equipped with an electric heating element (61) for directly heating the window glass (W) of the vehicle, an air conditioning unit (1) for blowing air conditioning air into the passenger compartment and an air conditioning unit ( 1), the inside / outside air switching means (6) for switching the intake mode of the air taken in, the comfort determining means (S20) for determining whether or not the humidity in the vehicle compartment is lower than the comfortable range, and the comfort determining means ( When it is determined in S20) that the humidity in the vehicle compartment is lower than the comfortable range, the inside / outside air switching means (6) is set to the inhalation mode mainly for inside air, and the electric heating element (61) is energized.
5) and are provided.

As a result, similarly to the first and third aspects, when the humidity in the vehicle compartment is lower than the comfortable range, the inhalation mode mainly for the inside air is automatically set, and the water released from the occupant is used to drive the vehicle. The indoor humidity can be raised to a comfortable range.

Further, when it is determined that the humidity in the vehicle compartment is lower than the comfortable range, the inside / outside air switching means (6) is set to the intake mode mainly for the inside air, and the electric heating element (61) is energized. It is possible to prevent the fogging of the vehicle window glass (W) by raising the temperature of the vehicle window glass by the heat generated by the electric heating element (61).

Moreover, since the electric heating element (61) is energized in association with the setting of the intake mode mainly for the inside air, it is not necessary to determine the fog for controlling the energization of the electric heating element (61), and the electric heating element (61) is not required. ), The energization control becomes easy.

According to the invention of claim 5, claim 1
In any one of 1 to 4, a 100% room air intake mode can be used as the room air mainly intake mode.

According to the invention of claim 6, claim 1
In any one of 4 to 4, the inside / outside air mixing mode in which the inside air intake ratio is higher than the outside air intake ratio may be used as the intake mode mainly for the inside air.

As a result, it is possible to raise the humidity in the passenger compartment to a comfortable range by circulating the inside air having a large intake ratio while exhibiting the ventilation effect in the passenger compartment by introducing a small amount of outside air.

According to the invention described in claim 7, claim 6
In the inside / outside air mixing mode, the inside air intake ratio may be increased as the humidity in the vehicle compartment decreases.

As a result, the rate of intake of inside air can be increased in accordance with the decrease in the humidity in the vehicle compartment, and the humidity in the vehicle compartment can be quickly raised to the comfortable range.

According to the invention of claim 8, claim 6
In 7 or 7, the inside / outside air mixing mode is alternately switched between the inside air mode for sucking the inside air and the outside air mode for sucking the outside air by the inside / outside air switching means (6), and the time of the inside air mode is made longer than the time of the outside air mode. Inhalation mode may be used.

According to the invention of claim 9, claim 6
In 7 or 7, there is an inside / outside air switching door (6) for adjusting the opening degree of the inside air inlet (3) and the outside air inlet (4) as the inside / outside air switching means, and the inside / outside air switching mode is set as the inside / outside air mixing mode. A suction mode may be set in which the opening degree of the inside air suction port (3) is made larger than the opening degree of the outside air suction port (4) by the door (6).

The reference numerals in parentheses of the above means indicate the correspondence with the specific means described in the embodiments described later.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a schematic structure of an entire vehicle air conditioner including a vehicle air conditioner anti-fog control device according to a first embodiment. It has an air conditioning unit 1 mounted inside the instrument panel or the like. The air conditioning unit 1 includes a case 2 that forms an air passage through which air is blown into the vehicle interior.
An inside / outside air switching box 5 having an inside air intake port 3 and an outside air intake port 4 is arranged at the most upstream part of the air passage of the case 2. An inside / outside air switching door 6 as an inside / outside air switching unit is rotatably arranged in the inside / outside air switching box 5.

The inside / outside air switching door 6 is driven by a servomotor 7. The inside air mode in which the inside air (vehicle interior air) is introduced from the inside air intake port 3 and the outside air (vehicle outside air) is introduced from the outside air intake port 4. Switch to outside air mode.

On the downstream side of the inside / outside air switching box 5, an electric blower 8 for generating an air flow toward the passenger compartment is arranged. In this blower 8, a centrifugal blower fan 8a is driven by a motor 8b. An evaporator 9 for cooling the air flowing in the case 2 is arranged downstream of the blower 8. The evaporator 9 is a heat exchanger for cooling that cools the blown air of the blower 8 and is one of the elements that constitute the refrigeration cycle 10.

The refrigeration cycle 10 is a well-known type in which the refrigerant is circulated from the discharge side of the compressor 11 to the evaporator 9 via the condenser 12, the receiver 13 and the expansion valve 14 forming the pressure reducing device. It is a thing. The compressor 11 is rotationally driven by transmitting rotational power of a vehicle engine (not shown) via the electromagnetic clutch 11a.

A heater core 15 for heating the air flowing in the case 2 is arranged on the downstream side of the evaporator 9. The heater core 15 is a heating heat exchanger that heats the air (cold air) that has passed through the evaporator 9 by using the cooling water (hereinafter, referred to as hot water) of the vehicle engine as a heat source, and bypasses the heater core 15 on the side thereof. A bypass passage 16 through which air flows is formed.

An air mix door 17 is rotatably arranged between the evaporator 9 and the heater core 15. This air mix door 17 is driven by a servo motor 18,
The rotational position (opening) can be continuously adjusted. Depending on the opening of the air mix door 17, the heater core 15
The amount of air that passes through (the amount of warm air) and the amount of air that passes through the bypass passage 16 and bypasses the heater core 15 (the amount of cool air) are adjusted, and thereby the temperature of the air blown into the vehicle interior is adjusted. There is. Therefore, in this example, the air mix door 17 constitutes a temperature adjusting means for the air blown into the vehicle interior.

At the most downstream part of the air passage of the case 2, a defroster outlet 19 for blowing out the conditioned air toward the front window glass W of the vehicle, and a face outlet 20 for blowing out the conditioned air toward the upper body of the occupant. , And a foot outlet 21 for blowing out the conditioned air toward the lower body of the occupant.

A defroster door 22, a face door 23 and a foot door 2 are provided upstream of the air outlets 19 to 21.
4 is rotatably arranged. These defroster door 22, face door 23 and foot door 24 are driven by a common servo motor 25 via a link mechanism (not shown).

The control device 30 as the control means is a CP
It is composed of a microcomputer including U, ROM, RAM, etc., and a control program for air conditioning control and anti-fog control in the vehicle compartment is stored in advance in the ROM, and various calculations are performed based on the control program. Perform processing. The control device 30 is connected to the battery B, and starts to execute the control program when electric power is supplied from the battery B.

The servomotors 7, 18, 25, the blower drive circuit 34, the clutch drive circuit 35, and the electric heating element 61 are connected to the output side of the control device 30, respectively. Here, the servomotors 7, 18, 25 constitute a door driving means, and the door position is controlled by adjusting the rotation amount thereof. The blower drive circuit 34 controls the voltage applied to the blower motor 8b to control the rotation speed (air volume) of the blower motor 8b. Further, the clutch drive circuit 35 intermittently energizes the electromagnetic clutch 11a of the compressor 11 to intermittently control the operation of the compressor 11.

The control device 30 is also adapted to intermittently control the energization of the electric heating element 61. Electric heating element 6
Reference numeral 1 is an anti-fog means for a front windshield W of a vehicle, and is composed of an electric heating element made of a transparent conductive thin film fixed to the front windshield W. The electric heating element 61 generates heat when electric power is supplied from the battery B of the vehicle and directly heats the front window glass W, thereby increasing the temperature of the front window glass W and removing fogging.

The fog on the front window glass W of the vehicle can be removed by blowing the conditioned air from the air conditioning unit 1. That is, the warm air heated by the heater core 15 or the conditioned air dehumidified by the evaporator 9 is blown from the defroster outlet 19 toward the front window glass W, whereby the fog on the front window glass W can be removed.

To the input side of the control device 30, operation switches 37 to 42 of an air conditioning operation panel 36 provided on an instrument panel (not shown) in front of the driver's seat in the vehicle compartment are connected. Among the operation switches 37 to 42, the inside / outside air changeover switch 37 has an inside air switch 37a for manually setting the inside air mode and an outside air switch 37b for manually setting the outside air mode.

The temperature setting switch 38 outputs a signal of the set temperature in the passenger compartment, and the blowout mode switch 39 manually sets the blowout mode to face mode, bilevel mode, foot mode, foot defroster mode, and defroster mode. Is a signal for. The air volume switch 40 outputs a signal for manually setting the blower 8 on / off and the air volume switching of the blower 8, and the air conditioner switch 41 issues an on / off signal for energizing the electromagnetic clutch 11a to intermittently operate the compressor 11. To do. The anti-fog switch 42 outputs a signal for manually setting ON / OFF of the electric heating element 61 of the front window glass W.

The inside air sensor 50 and the outside air sensor 5 are provided on the input side of the control device 30 as sensors for detecting the air-conditioning environmental conditions.
1, a solar radiation sensor 52, a water temperature sensor 53, an evaporator temperature sensor 54, a humidity sensor 55 and a vehicle speed sensor 56 are connected.

The inside air sensor 50 detects the inside air temperature and generates an inside air temperature signal Tr according to the detected temperature. The outside air sensor 51 detects the outside air temperature and generates an outside air temperature signal Tam according to the detected temperature. The solar radiation sensor 52 detects the amount of solar radiation that has entered the vehicle interior, and generates a solar radiation amount signal Ts corresponding to the detected amount of solar radiation. The water temperature sensor 53 detects the temperature of hot water circulating in the heater core 15, and generates a water temperature signal Tw according to the detected water temperature.

The evaporator temperature sensor 54 detects the temperature of the air blown from the evaporator 9 and generates an evaporator temperature signal Te corresponding to the detected temperature. The humidity sensor 55 is a humidity detecting means for detecting the humidity in the vehicle interior, and is installed, for example, in the vicinity of the instrument panel in front of the driver's seat in the vehicle interior, and outputs the humidity signal RH corresponding to the relative humidity in the vehicle interior. Occur. Vehicle speed sensor 5
6 generates a vehicle speed signal V according to the vehicle traveling speed.

Next, the operation of the first embodiment having the above structure will be described. When an ignition switch (not shown) of the vehicle engine is set to the ON position and power is supplied to the control device 30 from the battery B, the microcomputer of the control device 30 starts executing the control program. 2A is a control routine for vehicle interior comfort control (humidity control), and FIG. 2B is a control routine for vehicle window glass antifogging control. The control routine is executed by the microcomputer of the control device 30 at predetermined time intervals.

First, the comfort control in the passenger compartment will be described with reference to FIG. 2A. In step S10, the detected value of the relative humidity in the passenger compartment of the humidity sensor 55 is read. Next, step S
At 20, it is determined whether the vehicle interior humidity is within the comfortable range. Here, the comfortable range of the vehicle interior humidity is generally 40% RH to 60%.
% RH. However, in step S20 of this example, when the vehicle interior humidity is 40% RH or more, it is determined that the vehicle interior atmosphere is in a comfortable range with a sense of moisture, while
When the vehicle interior humidity is less than 40% RH, it is determined that the vehicle interior atmosphere is in a dry state and is not comfortable.

When it is determined in step S20 that the atmosphere inside the vehicle is comfortable, the process proceeds to step S30, and the outside air mode is set as the air intake mode. That is, the servo motor 7 is driven by the control signal of the control device 30 to operate the inside / outside air switching door 6 to the position indicated by the solid line in FIG. 1 to set the outside air mode.

On the other hand, when the humidity in the vehicle interior is less than 40% RH and it is determined that the atmosphere in the vehicle interior is in a dry state, the process proceeds to step S40, and the inside air mode is set as the air suction mode. That is, the servo motor 7 is driven by the control signal of the control device 30 to move the inside / outside air switching door 6 to the position shown in FIG.
Operate to the position indicated by the dashed line to set the inside air mode. here,
The one-dot chain line position of the inside / outside air switching door 6 is a 100% inside air intake state in which the outside air intake port 4 is fully closed and the inside air intake port 3 is fully opened.

As a result, the air conditioning unit 1 circulates the inside air to air-condition the passenger compartment. In winter, heater core 1
The inside air temperature heated by 5 is blown into the vehicle interior to heat the vehicle interior.

Since the air inside the vehicle compartment is conditioned by the circulation of the inside air, the water vapor released by the breathing of the occupant and the like stays in the vehicle interior and the amount of water in the air inside the vehicle compartment can be increased. As a result, the humidity inside the vehicle can be maintained in the vicinity of the comfortable range, so that the dry state inside the vehicle can be prevented. As a result, it is possible to prevent the occurrence of symptoms such as dry eyes and sore throat of the occupant.

On the other hand, in winter, the temperature of the vehicle window glass is lowered to a temperature close to the low temperature outside air, so that the air inside the vehicle compartment near the vehicle window glass is cooled by the low temperature vehicle window glass. Therefore, when the vehicle interior is air-conditioned by circulating the inside air, the vehicle interior air near the vehicle window glass reaches the dew point temperature (condensation), which easily causes fogging of the vehicle window glass.

Therefore, in this embodiment, as shown in FIG.
The anti-fogging control shown in (b) is performed to prevent fogging of the vehicle window glass. That is, in step S50 shown in FIG. 2B, the detection values detected by the various sensors 50 to 55 are read, and then in step S60, the fogging of the vehicle window glass is determined. Specifically, the vehicle interior relative humidity near the vehicle window glass is calculated (estimated), and the cloudiness determination is performed based on the vehicle interior relative humidity near the vehicle window glass.

Here, the vehicle interior relative humidity in the vicinity of the vehicle window glass can be calculated from the average vehicle interior humidity detected by the humidity sensor 55 and the vehicle window glass temperature. Also,
Although a dedicated temperature sensor for detecting the vehicle window glass temperature may be installed, in this example, the inside air temperature T detected by the inside air sensor 50 is information that affects the vehicle window glass temperature.
r, the outside air temperature Tam detected by the outside air sensor 51, the insolation amount Ts detected by the insolation sensor 52, and the vehicle speed V detected by the vehicle speed sensor 56, the inside air temperature Tr, the outside air temperature Tam, and the insolation amount Ts. , And the vehicle speed V are estimated based on the vehicle speed V.

The relative humidity in the vehicle compartment near the window glass of the vehicle calculated above is set to a predetermined value, for example, 98%.
When the temperature rises above RH, it is determined that the vehicle window glass is in a cloudy state, and the process proceeds from step S60 to step S70 to energize the electric heating element 61 to cause the electric heating element 61 to generate heat.

As a result, the temperature of the vehicle window glass rises, so that the relative humidity in the vehicle compartment near the vehicle window glass decreases and the vehicle window glass can be prevented from fogging. Then, when the relative humidity in the vehicle compartment near the vehicle window glass falls below the above-mentioned predetermined value, the vehicle window glass is not fogged, so that the step S
From 60, the process proceeds to step S80, and the power supply to the electric heating element 61 is cut off. Thereby, the power consumption of the electric heating element 61 can be reduced.

According to the first embodiment, the vehicle interior air-conditioning by the internal air circulation raises the vehicle interior humidity, and
Since it is possible to prevent the inside of the vehicle from being dried, it is not necessary to mount a dedicated humidifier on the vehicle as in the prior art. Moreover, when it is determined that the vehicle window glass is fogged based on the relative humidity in the vehicle window near the vehicle window glass, the electric heating element 61 of the vehicle window glass is energized to raise the vehicle window glass temperature. The anti-fog effect of glass can be demonstrated.

(Second Embodiment) In the first embodiment, FIG.
Although the vehicle interior comfort control of (a) and the anti-fog control of the vehicle window glass of FIG. 2 (b) are independently performed, in the second embodiment, as shown in FIG. 3, in step S20. When the dry state of the passenger compartment is determined and the inside air mode is set in step S40, the antifogging control in steps S50 to S80 is performed.

That is, in the second embodiment, the anti-fog control of steps S50 to S80 is performed only when the inside air mode is set for the purpose of controlling the comfort of the passenger compartment. Even in this case, the anti-fog effect of the vehicle window glass can be exhibited when the inside air mode is set for the comfort control in the vehicle interior.

(Third Embodiment) In the first and second embodiments, the electric heating element 61 is energized in step S70 to protect the vehicle window glass only when it is determined in step S60 that the vehicle window glass is clouded. Although the cloudy effect is exhibited, in the third embodiment, as shown in FIG. 4, when the dry state of the vehicle compartment is determined in step S20, the inside air mode is set in step S45 and the electric heating element 61 is set. It is energized to exert the anti-fog effect on the vehicle window glass.

According to the third embodiment, the electric heating element 61 is constantly energized in association with the setting of the inside air mode, so that the electric power consumption of the electric heating element 61 increases, but the relative humidity in the passenger compartment near the window glass of the vehicle increases. The energization control of the electric heating element 61 based on it is not necessary, and the energization control of the electric heating element 61 can be simplified.

On the other hand, according to the first and second embodiments, by the anti-fogging control in steps S50 to S80, the relative humidity in the vehicle compartment near the window glass of the vehicle immediately before the occurrence of fogging (for example,
It is possible to control that the electric heating element 61 is energized for the first time when the temperature rises to 98% RH described above, and the electric power consumption of the electric heating element 61 can be suppressed to a minimum. By suppressing this power consumption, it is possible to reduce the power generation load of the vehicle-mounted generator and suppress deterioration of fuel efficiency of the vehicle engine.

In the first to third embodiments, step S20 constitutes the comfort determining means of the present invention, and step S40 constitutes the inside / outside air control means of the present invention.
Step S60 constitutes the fogging determination means of the present invention,
The step S70 constitutes the energization control means of the present invention. Further, step S60 and step S70 constitute the anti-fogging control means of claim 3. Further, in the third embodiment, step S45 constitutes the control means of claim 4.

(Other Embodiments) The present invention is not limited to the above embodiments, but can be variously modified.

(1) In the first and second embodiments, the vehicle interior relative humidity near the vehicle window glass is calculated in step S60, and the vehicle window glass is fogged based on the vehicle interior relative humidity near the vehicle window glass. However, the cloudiness determination of the vehicle window glass may be performed by another method described below.

That is, when the temperature of the vehicle window glass drops to the dew point temperature corresponding to the humidity of the vehicle interior air, the vehicle window glass becomes fogged. Therefore, the humidity of the vehicle interior air is measured based on the detection value of the humidity sensor 55. Calculate the dew point temperature
The calculated dew point temperature may be compared with the vehicle window glass temperature, and when the vehicle window glass temperature has a relationship of not more than the calculated dew point temperature, the fogging of the vehicle window glass may be determined.

Further, a dew condensation sensor for detecting a dew condensation state is installed on the surface of the vehicle window glass, the fogging of the vehicle window glass is directly detected by this dew condensation sensor, and the vehicle window glass is detected based on the detected value of the dew sensor. Fogging may be determined.

(2) In any of the first to third embodiments, when the dry state of the vehicle compartment is determined in step S20, the inside / outside air switching door 6 is moved to the alternate long and short dash line in FIG. 1 by the control signal of the control device 30. Although the internal air mode of 100% internal air intake is set by operating to the position, the external air mode may be set at appropriate times for ventilation in the vehicle interior.

Further, when determining the dry state of the passenger compartment, the inside / outside air mixing mode in which the inside air intake ratio is larger than the outside air intake ratio may be set.

Specifically, the inside / outside air for operating the inside / outside air switching door 6 is moved to an intermediate opening position (a broken line position 6'in FIG. 1) where the opening degree of the inside air inlet 3 is made larger than that of the outside air inlet 4. The mixing mode may be set. As described above, when the inside / outside air mixing mode is set, the effect of increasing the humidity in the vehicle interior is reduced as compared with the inside air mode of 100% inside air suction, but on the other hand,
It is possible to obtain the ventilation effect in the vehicle compartment by introducing the outside air.

(3) For the purpose of obtaining the same effect as that of the above-mentioned other embodiment (2), the inside / outside air switching door 6 is set to 10
Inside air mode position of 0% inside air intake (position indicated by alternate long and short dash line in FIG. 1)
And the outside air mode position of 100% outside air intake (the position of the broken line in FIG. 1) are alternately switched, and the inside air mode time of 100% inside air intake may be made longer than the time of the outside air mode of 100% outside air intake. .

Specifically, the inside air mode time for 100% inside air intake may be set to 10 seconds, and the outside air mode time for 100% outside air intake may be set to 3 seconds, for example, and these may be switched alternately.

(4) A vehicle interior air pollution sensor for detecting dust, cigarette smoke, etc. in the vehicle interior air is installed in the vehicle interior. When the vehicle interior air pollution sensor detects contamination of the vehicle interior air, To prevent the vehicle interior from drying, even when the 100% room air intake mode is set to the room air mode or the room air-based intake mode, the mode is forcibly switched to the 100% room air intake mode of the outside air mode or the room air-based intake mode. You may do it.

(5) In each of the first to third embodiments, the case where the energization of the electric heating element 61 is simply controlled to be turned on and off has been described, but the energization current of the electric heating element 61 is finely controlled by duty control or the like. Then, if the amount of heat generated by the electric heating element 61 is controlled so as to ensure the necessary minimum antifogging effect, the power consumption of the electric heating element 61 can be effectively reduced.

(6) In each of the first to third embodiments, no particular reference is made to the limitation of the ON (energized) state of the electric heating element 61, but the power consumption due to the electric conduction to the electric heating element 61 is large. Therefore, it causes the over-discharge of the vehicle-mounted battery B. Therefore, when the state of charge of the vehicle-mounted battery B is determined based on the voltage of the vehicle-mounted battery B and the like, and when it is determined that the vehicle-mounted battery B is in a state of charge below a predetermined level, the electric heating element 61 is turned on (energized). It may be automatically canceled so that over-discharge of the vehicle-mounted battery B can be prevented in advance.

When the vehicle engine control unit (engine ECU) has a function of determining the state of charge of the on-vehicle battery B, the battery heating state determination signal from the engine control unit is used to generate the electric heating element. 61 ON
The (energized) state may be automatically canceled.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an entire system according to a first embodiment of the present invention.

FIG. 2A is a flowchart showing air conditioning comfort control of the first embodiment, and FIG. 2B is a flowchart showing antifogging control of the first embodiment.

FIG. 3 is a flowchart showing air conditioning comfort control and anti-fog control of the second embodiment.

FIG. 4 is a flowchart showing air conditioning comfort control and anti-fog control of a third embodiment.

[Explanation of symbols]

1 ... Air conditioning unit, 6 ... Inside / outside air switching door, 61 ... Electric heating element, W ... Vehicle window glass.

Continued front page    (72) Inventor Masahiko Sugaya             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO

Claims (9)

[Claims] 1. In a vehicle including an electric heating element (61) for directly heating a vehicle window glass (W), an air conditioning unit (1) for blowing out conditioned air into a vehicle compartment, and the air conditioning unit (1) sucking the air. The inside / outside air switching means (6) for switching the air intake mode, the comfort determining means (S20) for determining whether the humidity in the vehicle compartment is lower than the comfortable range, and the comfort determining means (S20) for the vehicle When it is determined that the indoor humidity is lower than the comfortable range, the inside / outside air control unit (S40) that sets the inside / outside air switching unit (6) to the inhalation mode mainly for the inside air, and the fogging of the vehicle window glass (W). A fog determining means (S60) for determining whether or not the vehicle windshield (W) is fogged by the fog determining means (S60), and an energization control means (S70) for energizing the electric heating element (61). Equipped with A vehicle air-conditioning anti-fog control device characterized by the following. 2. The fogging determination means (S60) determines fogging of the vehicle window glass (W) based on at least the humidity in the vehicle compartment and the vehicle window glass temperature. The vehicle air-conditioning anti-fog control device described. 3. In a vehicle including an electric heating element (61) for directly heating a vehicle window glass (W), an air conditioning unit (1) for blowing out conditioned air into a passenger compartment, and the air conditioning unit (1) sucking the air. The inside / outside air switching means (6) for switching the air intake mode, the comfort determining means (S20) for determining whether the humidity in the vehicle compartment is lower than the comfortable range, and the comfort determining means (S20) for the vehicle Inside / outside air control means (S40) for setting the inside / outside air switching means (6) to an inhalation mode mainly for inside air when it is determined that the indoor humidity is lower than the comfortable range; the inside humidity and the vehicle window glass; The humidity near the vehicle window glass is calculated based on the temperature, and the electric heating element (6) is set so that the humidity near the vehicle window glass becomes a predetermined value or less.
Anti-fog control means (S60, S70) for controlling the energization of 1)
An air-conditioning anti-fog control device for a vehicle, comprising: 4. In a vehicle including an electric heating element (61) for directly heating a vehicle window glass (W), an air conditioning unit (1) for blowing out conditioned air into a vehicle compartment, and the air conditioning unit (1) sucking the air. The inside / outside air switching means (6) for switching the air intake mode, the comfort determining means (S20) for determining whether the humidity in the vehicle compartment is lower than the comfortable range, and the comfort determining means (S20) for the vehicle When it is determined that the indoor humidity is lower than the comfortable range, the inside / outside air switching means (6) is set to the inhalation mode mainly for the inside air, and the control means (S4) for energizing the electric heating element (61).
5) An air conditioning anti-fog control device for a vehicle, comprising: 5. The inhalation mode mainly for the inside air is 100%
The vehicle air-conditioning anti-fog control device according to any one of claims 1 to 4, which is in an inside air intake mode. 6. The air conditioning system for a vehicle according to claim 1, wherein the intake mode mainly for the internal air is an internal / external air mixing mode in which the internal air intake ratio is larger than the external air intake ratio. Anti-fog control device. 7. The air conditioning anti-fog control device for a vehicle according to claim 6, wherein, in the inside / outside air mixing mode, the inside air intake ratio is increased as the humidity in the vehicle compartment decreases. 8. The inside / outside air mixing mode alternates between an inside air mode for sucking the inside air and an outside air mode for sucking the outside air by the inside / outside air switching means (6), and the time of the inside air mode is set to the outside air mode. The air conditioning anti-fog control device for a vehicle according to claim 6 or 7, wherein the inhalation mode is set to be longer than the time. 9. The inside / outside air switching means is an inside air suction port (3).
And an inside / outside air switching door (6) for adjusting the opening degree of the outside air intake port (4). In the inside / outside air mixing mode, the inside / outside air mixing door (6) controls The air conditioning anti-fog control device for a vehicle according to claim 6 or 7, wherein the mode is an intake mode in which the opening is made larger than the opening of the outside air intake (4).