JP2014061778A - Air-conditioning control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air-conditioning control device for a vehicle enabling improvement of vehicle fuel economy while securing front visibility of an occupant.SOLUTION: An air-conditioning control device for a vehicle includes: a window glass 1 having an inner surface to which hydrophilic treatment or water-absorbing treatment is applied; a first damper 11 that can switch a mixing ratio between inside air and outside air by opening/closing an inside air introduction port 3b and an outside air introduction port 3a; a blower fan 4 that sends inside air and outside air to the inner surface of the window glass 1; and a control unit 7 that controls the first damper 11 and the blower fan 4. The air-conditioning control device for the vehicle further includes freezing risk determination means 9 for determining a possibility of freezing of moisture on the inner surface of the window glass 1 at least on the basis of a vehicle driving state and a vehicle interior state. When the possibility of the freezing is determined to exist, the control unit 7 executes inside air increase control for increasing a ratio of inside air sent to the inner surface of the window glass 1 as a vehicle speed decreases.

Description

  The present invention relates to a vehicle air-conditioning control device, and more particularly to a vehicle air-conditioning control device including a window glass having an inner surface subjected to hydrophilic treatment or water absorption treatment.

  Conventionally, in a gasoline vehicle, when the wind glass is fogged due to condensation or the like, the occupant selects the defroster mode to remove moisture adhering to the inner surface of the wind glass. When this defroster mode is selected, the compressor of the air conditioning unit is driven by the engine and the dehumidifying function by the evaporator starts to operate, so low-humidity conditioned air is blown from the defroster outlet to the inside of the wind glass, Moisture adhering to the glass is vaporized to eliminate fogging of the wind glass.

In recent years, demands for electric vehicles and hybrid vehicles that can be electrically driven have been increasing due to requirements such as carbon dioxide emission regulations and fuel efficiency reduction. These electric vehicles and the like lack a heat source compared to gasoline vehicles due to the structure of the drive mechanism. Therefore, the heating efficiency of the air conditioning is increased by circulating the air in the passenger compartment (so-called inside air) warmed by the body temperature of the occupant.
However, since the inside air contains a lot of moisture, there is a problem that when the inside air circulation is frequently used, the humidity in the passenger compartment increases and the fogging frequency of the wind glass increases.
Accordingly, a window glass having a glass surface subjected to an antifogging treatment has been proposed. This anti-fogging glass is configured such that, for example, a hydrophilic or water-absorbing film is formed on the glass surface, and condensation that causes fogging is unlikely to occur.

The antifogging glass whose surface has been subjected to hydrophilic treatment suppresses the occurrence of condensation due to an antifogging function that forms a thin water film that uniformly spreads moisture adhering to the surface.
However, when the amount of moisture adhering to the glass surface exceeds the saturated moisture content of the hydrophilic coating, the amount of moisture that can be retained by the hydrophilic coating is saturated, so that excess moisture appears. Cloudiness due to freezing occurs. Even when the saturated moisture content is not exceeded, there is a possibility that icing will occur due to the moisture contained in the hydrophilic coating, and the glass surface will become cloudy.
When the water absorption treatment is performed on the glass surface, there is a possibility that the structure is destroyed due to freezing of water held in the water absorbing film, and as a result, the glass surface may be clouded.

  The glass antifogging device for automobiles of Patent Document 1 is not an antifogging glass in which a hydrophilic treatment or a water absorbing treatment is performed on the glass surface, but an antifogging glass in which a glass heating device is disposed inside the window glass, When the window glass is frozen or condensed, it is equipped with an anti-fog air conditioner that dehumidifies the inner surface of the wind glass, an icing sensor that detects the icing state of the outer surface of the wind glass, and a dew sensor that detects the dew state of the inner surface of the wind glass. The window glass is heated by a glass heating device and an anti-fogging air conditioner to remove icing or condensation.

Japanese Utility Model Publication No. 1-125717

Since the glass anti-fogging device for automobiles of Patent Document 1 is provided with an icing sensor and a dew condensation sensor, frost and dew on the wind glass are removed depending on the icing state and the dew condensation state actually generated on the wind glass. In addition, it is possible to efficiently remove the fogging of the window glass.
However, in Patent Document 1, since the icing state and the dew condensation state of the wind glass are detected by the respective sensors, the period from the detection of the state of the wind glass to the start of the operation of the glass heating device and the antifogging air conditioner. The wind glass is clouded by freezing and condensation. That is, until the start of the operation of the glass heating device or the like, the forward visibility of the occupant may be reduced, and the safety may be deteriorated. Moreover, in patent document 1, since the freezing and dew condensation of wind glass are removed by the glass heating apparatus etc., the electric power for operating a glass heating apparatus etc. in addition to the electric power for heating is needed at the time of cold, There is also a risk of deteriorating fuel consumption.

When the technique of Patent Document 1 is used in combination with the antifogging glass on which a hydrophilic coating is formed, the condensation on the inner surface of the wind glass is efficiently suppressed until the amount of water retained in the hydrophilic coating exceeds the saturated moisture content. be able to. However, when the water content exceeds the saturated water content, the glass heating device or the like does not operate unless after the freezing of the hydrophilic coating surface is detected.
That is, until the glass heating device or the like starts to operate after detecting the icing state of the wind glass, the wind glass is fogged due to icing as described above, and it is impossible to avoid a decrease in front visibility of the occupant. Moreover, when moisture removal (dehumidification) of the antifogging glass is performed using a glass heating device or the like, the water film on the surface of the glass becomes thinner as a result of moisture removal due to its antifogging function. There is a risk that the water film will re-freeze due to the propagated outside air temperature.
Even when antifogging glass having a water-absorbing film is used in combination, the glass heating device or the like does not operate unless icing is detected.

  An object of the present invention is to provide a vehicle air-conditioning control device and the like that can improve the fuel efficiency of a vehicle while ensuring forward visibility of an occupant.

  The vehicle air-conditioning control device according to claim 1 is capable of switching the mixing ratio of the inside air and the outside air by opening and closing the window glass whose inner surface is subjected to hydrophilic treatment or water absorption treatment, and the inside air introduction port and the outside air introduction port. In the vehicle air-conditioning control apparatus comprising: an inside / outside air switching means; a blowing means for blowing the inside air and the outside air to the inner surface of the window glass; and a control means for controlling the inside / outside air switching means and the blowing means. Icing risk determination means for determining the possibility of water icing based on at least the vehicle operating state and the in-vehicle state, and when the control means determines that there is a possibility of icing, it blows air to the inner surface of the window glass. The inside air increase control is performed such that the ratio of the inside air to be increased increases as the vehicle speed decreases.

In the vehicle air conditioning control device according to claim 1, when the inner surface is provided with a window glass that has been subjected to hydrophilic treatment, the inner surface of the wind glass is formed by forming a water film that uniformly spreads moisture adhering to the glass surface. In the case where the inner surface is provided with a window glass that has been subjected to water absorption treatment, the occurrence of condensation on the inner surface of the wind glass can be suppressed by incorporating moisture into the coating.
In addition, since it is equipped with an icing risk determination means for determining the possibility of moisture on the inner surface of the wind glass based on at least the vehicle operating state and the in-vehicle state, the icing risk on the inner surface of the wind glass can be detected in advance. Before the fogging due to freezing is generated on the inner surface of the wind glass, the ratio of the high-temperature and high-humidity air blown to the inner surface of the wind glass can be increased as the vehicle speed decreases.

  According to a second aspect of the present invention, in the first aspect of the invention, the control means performs an internal / external air switching control that alternately increases the ratio of the internal air and the external air a plurality of times immediately after the internal air amount increase control. .

According to the first aspect of the present invention, the ratio of the inside air blown to the inner surface of the wind glass is increased as the vehicle speed is lowered before the fogging due to freezing is generated on the inner surface of the wind glass. Therefore, in the low vehicle speed state where the risk of freezing is low. It is possible to increase the thickness of the water film on the inner surface of the wind glass and to raise the temperature of the wind glass, and to prevent frosting of the water film due to the outside air temperature propagated through the wind glass, thereby preventing the wind glass from being fogged.
In addition, since the water film on the inner surface of the wind glass is thickened and the temperature of the wind glass is increased by circulating the inside air, there is no need to newly provide another mechanism such as a glass heating device. Power consumption can be suppressed. Therefore, it is possible to improve the fuel efficiency of the vehicle while ensuring the forward visibility of the occupant.

  According to the second aspect of the present invention, since the inner surface of the wind glass can be dehumidified by introducing the low-humidity outside air while maintaining the heating performance by the internal air circulation, both the heating function and the dehumidifying function of the inner surface of the wind glass can be achieved.

It is the schematic diagram which showed the whole structure of the vehicle air conditioner control apparatus which concerns on Example 1 of this invention. It is a block diagram of a control system of a vehicle air-conditioning control device. It is an icing risk judgment map which shows correlation with vehicle speed, outside temperature, and icing risk judgment value. It is an inside air ratio map which shows correlation with a vehicle speed and inside air ratio. It is a graph which shows the relationship between the vehicle speed and internal air mixing ratio in internal air increase control. It is a flowchart of the control processing by a control unit. It is a time chart explaining switching of the mixing ratio of inside air and outside air. It is a correction map of freezing risk.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, in the present embodiment, an air conditioning control device for an electric vehicle V including a window glass 1, an air conditioner 2, a travel motor (not shown), and the like will be described as an example.
The present invention may be applied to a gasoline engine vehicle other than the electric vehicle V, and particularly to a vehicle in which the engine coolant temperature is unlikely to rise as compared with a gasoline engine vehicle such as a diesel engine vehicle or a hybrid vehicle. It is valid.

The wind glass 1 is an anti-fogging glass in which a hydrophilic treatment is applied to the vehicle interior side surface.
Specifically, an antifogging coating 1a as a hydrophilic layer is laminated on the inner surface of the window glass 1, and the antifogging coating 1a contains a material imparting hydrophilicity, for example, a surfactant.
This window glass 1 expresses the anti-fogging function by forming the water | moisture content which the anti-fogging film 1a adhered to the inner surface of the window glass 1 in a water film.

Next, the air conditioner 2 will be described.
As shown in FIG. 1, the air conditioner 2 includes an air conditioning duct 3, a blower fan 4 (blower unit), an evaporator 5, a heater 6, a control unit 7 (control unit), and the like.
The air conditioner 2 controls the temperature, air volume, and blowing direction of the conditioned air according to a set temperature (for example, 25 ° C.), a set air volume (for example, medium air volume), and a set direction (for example, defroster mode) set by the occupant. This is an auto air conditioner that can automatically control the cabin temperature. The conditioned air of the air conditioner 2 is formed by outside air or inside air, or a mixture of outside air and inside air.

  The air-conditioning duct 3 forms a passage for introducing conditioned air into the vehicle interior. The outside air introduction port 3 a for introducing outside air from the outside of the vehicle, the inside air introduction port 3 b for introducing inside air from the inside of the vehicle interior, and the inner surface of the wind glass 1. A defroster outlet 3c for blowing conditioned air, a face outlet 3d for blowing conditioned air to the head and chest of the occupant, a foot outlet 3e for blowing conditioned air to the legs of the occupant, and the like are provided.

  A first damper 11 (inside / outside) capable of switching the mixing ratio between the inside air and the outside air by adjusting the opening degree of the outside air introduction port 3a and the inside air introduction port 3b at an intermediate position between the outside air introduction port 3a and the inside air introduction port 3b. Air switching means) is provided. A second damper 12 capable of adjusting the ratio of the conditioned air (warm air) passing through the heater 6 and the conditioned air (cold air) bypassing the heater 6 is provided at an intermediate position between the evaporator 5 and the heater 6. . A third damper 13 is provided at an intermediate position between the defroster air outlet 3c and the face air outlet 3d, and the opening degree of the defroster air outlet 3c and the face air outlet 3d can be adjusted to change the blowing direction of the conditioned air. A fourth damper 14 is provided at an intermediate position between the face air outlet 3d and the foot air outlet 3e to adjust the opening degree of the face air outlet 3d and the foot air outlet 3e to change the air blowing direction. Yes.

As shown in FIG. 2, the 1st-4th dampers 11-14 are each rotationally driven by the 1st-4th actuators 11a-14a, and are comprised so that the flow volume and direction of an air conditioning wind can be adjusted.
The centrifugal blower fan 4 is disposed downstream of the outside air introduction port 3a and the inside air introduction port 3b and upstream of the evaporator 5, and is configured to blow a predetermined amount of conditioned air into the vehicle interior. The blower fan 4 is rotationally driven by a fan motor 4a.

The evaporator 5 is disposed so as to cross the entire downstream passage of the blower fan 4.
The evaporator 5 is a cooling heat exchanger that is connected to a compressor (not shown) and cools the conditioned air using latent heat of vaporization of the refrigerant. The compressor is set so as to be forcibly stopped when the outside air temperature is 0 ° C. or lower in consideration of the viscosity of the refrigerant.

The heater 6 is disposed on the downstream side of the evaporator 5 with a predetermined interval.
The heater 6 is a heat exchanger for heating that is in contact with a battery (not shown) and reheats the conditioned air (cold air) that has passed through the evaporator 5. As described above, the mixing ratio of the conditioned air passing through the heater 6 (warm air) and the conditioned air passing through the heater 6 (cold air) is adjusted by the rotating operation of the second damper 12, and the conditioned air supplied to the passenger compartment. The temperature is adjusted.

As shown in FIG. 2, the control unit 7 includes a CPU, a ROM, a RAM, and the like (all not shown), and includes an air conditioning control means 8 and an icing risk determination means 9.
As shown in FIG. 3, the ROM stores an icing risk determination map in which the correlation between the vehicle speed, the outside air temperature, and the icing risk determination value A is preset according to the vehicle speed. The icing risk determination map is set in advance based on experiments or simulations, and is set to have a characteristic that the icing risk determination value A increases as the vehicle speed increases and the outside air temperature increases.

  As shown in FIGS. 1 and 2, the control unit 7 detects the presence / absence of an occupant seated for each seat in order to grasp the outside air temperature sensor 21, the vehicle room temperature sensor 22, and the number of passengers on the vehicle. A plurality of sheet sensors 23, a temperature / humidity sensor 24 for detecting the temperature and humidity in the vicinity of the inner surface of the window glass 1, a wheel speed sensor 25 for detecting the traveling speed of the electric vehicle V, a temperature setting switch, an air volume setting switch, and the like. An operation panel 26 having a setting switch and an inhibitor switch capable of detecting the range state of the electric vehicle V are electrically connected.

The control unit 7 is configured such that the inside air increase control and the inside / outside air switching control can be executed in parallel with the normal auto air conditioner control.
In these inside air increase control and inside / outside air switching control, when it is determined that there is a possibility that the inner surface of the wind glass 1 is frozen, the third damper 13 and the fourth damper 14 are rotated to operate the wind glass 1 from the defroster outlet 3c. Air conditioned air is blown on the inner surface.

The control unit 7 executes an inside air increase control that increases the ratio of the inside air that is blown from the defroster outlet 3c to the inner surface of the wind glass 1 as the vehicle speed decreases.
The water film adhering to the surface of the anti-fogging coating 1a is easily frozen by the outside air temperature propagated through the wind glass 1 when the propagation amount of the outside air temperature is large due to an increase in vehicle speed or when the water film is thinned by dehumidification. Therefore, in this inside air volume increase control, high-temperature and high-humidity conditioned air in which the ratio of the inside air is increased as compared with the outside air is blown out to the inside surface of the wind glass 1 before the inside surface of the wind glass 1 is frozen. As a result, the water film adhering to the surface of the antifogging coating 1a is thickened and the window glass 1 is heated.

  As shown in FIG. 4, the ROM stores an inside air ratio map in which the correlation between the vehicle speed and the inside air ratio is preset. The inside air ratio map increases stepwise as the vehicle speed decreases at a first predetermined speed, for example, 30 km / h or less, and increases gradually in a curved shape as the vehicle speed decreases above the first predetermined speed. At a predetermined speed of, for example, 80 km / h or more, a predetermined ratio value, for example, an inside air mixing ratio that converges to 10% is set. FIG. 5 shows an example of the correlation between the vehicle speed and the inside air ratio in the inside air increase control.

Immediately after the inside air increase control, the control unit 7 performs inside / outside air switching control in which the ratio of the inside air to the outside air is alternately increased continuously several times.
Although the inside air volume increase control can thicken the water film attached to the surface of the antifogging coating 1a, the amount of moisture attached to the surface of the antifogging coating 1a is increased compared with the case where the inside air volume increase control is not executed, thereby preventing There is a possibility that the water content retained in the cloudy film 1a may exceed the saturated water content. Therefore, the antifogging coating 1a can be dehumidified by repeating the outside air increasing process in which the outside air introduction ratio is increased a plurality of times. Moreover, the vehicle interior temperature can be raised and the heating function can be enhanced by repeating the internal air increase process in which the internal air circulation rate is increased continuously several times after the internal air increase control.

  The air conditioning control means 8 includes a blower motor 4a, first to fourth actuators 11a to 14a based on input signals input from the sensors 21 to 25 and 27 and the operation panel 26 and a control program stored in advance. The operation state of the heater 6 or the like is controlled, and a desired temperature, air volume, and conditioned air in the blowing direction set by the occupant can be supplied to the vehicle interior.

The icing risk determination means 9 is configured to be able to determine the possibility that the moisture on the surface of the anti-fogging coating 1a freezes, that is, the so-called icing risk based on at least the vehicle operating state and the in-vehicle state.
In this embodiment, the icing risk value R is calculated by the following equation (1), and when the icing risk value R is a predetermined value, for example, 40 or more, it is determined that there is an icing risk of the wind glass 1.
R = A + k1 * T + k2 * M + k3 * P (1)
Here, A is the icing risk judgment value, T is the passenger compartment temperature, M is the humidity near the inner surface of the wind glass 1, P is the number of passengers, and k1 to k3 are correction coefficients.

Next, control processing by the control unit 7 will be described based on the flowchart of FIG.
First, input signals input from the sensors 21 to 25 and 27 and the operation panel 26 are read (S1), and it is determined whether or not the air conditioner 2 is activated (S2). If the result of the determination in S2 is that the air conditioner 2 has not been activated, the process returns.

As a result of the determination in S2, if the air conditioner 2 is activated, the process proceeds to S3 and the environment is grasped. In grasping the environment, the output from each sensor is received, and the outside air temperature, the passenger compartment temperature, the humidity in the vicinity of the inner surface of the wind glass 1, the number of passengers, the set air conditioning temperature, the set air volume, the air blowing direction, and the like are detected.
Next, in S4, it is determined whether or not the vehicle is traveling based on the range state of the electric vehicle V. As a result of the determination in S4, if the vehicle is not traveling such as N, P Shinji, the process returns.

As a result of the determination in S4, when the vehicle is traveling, the process proceeds to S5, and the icing risk value R is calculated.
The icing risk value R is calculated by the formula (1) based on the icing risk judgment value A, the passenger compartment temperature T, the humidity M, and the number of passengers P. Next, it is determined whether or not there is a risk of freezing on the inner surface of the window glass 1 (S6). In S6, if the freezing risk value R calculated in S5 is 40 or more, it is determined that there is freezing risk, and if the freezing risk value R is less than 40, it is determined that there is no freezing risk.

If the result of determination in S6 is that there is a risk of icing (40 ≦ R), the process proceeds to S7, and the inside air volume increase control that increases the ratio of the inside air blown to the inner surface of the wind glass 1 based on the inside air ratio map as the vehicle speed decreases is predetermined. The water film adhering to the surface of the anti-fogging coating 1a is thickened for a long time. Thereby, the temperature rise of the window glass 1 is aimed at, promoting the heating effect.
After S7, the inside / outside air switching control is executed for a predetermined time (for example, 2 minutes) to dehumidify the surface of the antifogging coating 1a and promote heating, and then return.

Next, based on the time chart of FIG. 7, the control process of the control unit 7 during the traveling of the electric vehicle V will be described.
At time t0 when the key is operated, the electric vehicle V starts to travel, and power is supplied to the air conditioner 2 from an in-vehicle power source (not shown). Immediately after the start of the operation of the air conditioner 2, the window glass 1 is heated, so that it is forcibly increased to a safe range (for example, an inside air ratio of 90%) based on the saturated moisture content of the known anti-fogging coating 1 a, and the cabin temperature is increased. The forced increase is stopped at time t1 when the target temperature (25 ° C.) is reached. Thereby, the inside air ratio is adjusted to the inside air ratio (for example, 30%) set by the automatic air conditioner function.

  At the time t2 when the water on the surface of the anti-fogging coating 1a is likely to freeze, the inside air ratio is increased to 50% and the inside air volume increase control is performed for a predetermined time. The vehicle interior temperature rises above the target temperature as the window glass 1 rises, and the water film adhering to the surface of the antifogging coating 1a becomes thicker. The electric vehicle V is traveling at a low speed of 40 km / h.

Inside / outside air switching control is performed between times t3 and t4 that are continuous with the inside air increasing control. When the inside air circulation ratio is increased, the inside air ratio is set to 50% as in the inside air increase control, and when the outside air introduction ratio is increased, the outside air ratio is set to 100%. In the present embodiment, a cycle in which the inside air circulation ratio increasing process and the outside air introduction ratio increasing process are performed as one cycle is executed three times. As a result, the window glass 1 is dehumidified, and the temperature in the passenger compartment gradually decreases.
At time t4 when the inside / outside air switching control is finished, the inside air ratio is set to 30% as before the control start, and the vehicle interior temperature is maintained at 25 ° C.

Next, functions and effects of the vehicle air conditioning control device according to the first embodiment will be described.
According to this vehicle air-conditioning control device, the ratio of the inside air blown to the inner surface of the wind glass 1 increases as the vehicle speed decreases before the fogging due to freezing occurs on the inner surface of the wind glass 1, so that the risk of freezing is low. In the vehicle speed state, the water film on the inner surface of the wind glass 1 can be thickened and the temperature of the wind glass 1 can be raised, so that the freezing of the water film due to the outside air temperature propagated through the wind glass 1 can be suppressed to prevent the wind glass 1 from being fogged. Can be prevented. Further, since the water film on the inner surface of the wind glass 1 is thickened and the temperature of the wind glass 1 is increased by circulating the inside air, there is no need to newly provide another mechanism such as a glass heating device, and the other mechanism is activated. Power consumption can be suppressed. Therefore, it is possible to improve the fuel efficiency of the vehicle while ensuring the forward visibility of the occupant.

  Immediately after the inside air increase control, the inside / outside air switching control for alternately increasing the ratio of the inside air and the outside air a plurality of times is performed. Thereby, since the inner surface of the wind glass can be dehumidified by introducing the outside air of low humidity while maintaining the heating performance by the internal air circulation, both the heating function and the dehumidifying function of the inner surface of the wind glass can be achieved.

Next, a modification in which the above embodiment is partially changed will be described.
1) In the above embodiment, an example in which a hydrophilic film is formed as an antifogging film on the inner surface of the wind glass has been described. However, the inner surface of the wind glass has functions of both hydrophilicity and water absorption or only water absorption. It is also possible to provide an anti-fogging coating.

2] In the above-described embodiment, the example in which the inside air increase control and the inside / outside air switching control are executed for a predetermined time when there is a possibility that the inner surface of the wind glass is frozen has been explained. A control map in which the execution time is set long may be provided. Further, the execution time may be changed only for arbitrary control, and a control map may be provided. Thereby, simplification of control can be achieved.

3) In the above embodiment, the example in which the outside air ratio is set to a fixed value (100%) in the outside air increasing process of the inside / outside air switching control has been described. However, it is also possible to set the outside air ratio according to the icing risk value. Thereby, the coexistence with the dehumidification effect of a window glass and the heating effect of a vehicle interior can be aimed at.

4) In the above embodiment, an example in which only the humidity inside the vehicle interior is detected has been described. However, an outside air humidity sensor is provided, and the outside air ratio in the outside air increasing process of the inside / outside air switching control is reduced as the humidity difference between the inside and outside of the vehicle is small. You may enlarge it. Thereby, the dehumidification effect of a wind glass can be enlarged.

5) In the above-described embodiment, the example in which the icing risk value is calculated based on the icing risk judgment value, the passenger compartment temperature, the humidity in the vicinity of the inner surface of the windshield, and the number of passengers has been described. Further, the temperature difference between the outside air temperature and the inside air temperature May be added to the above requirement to calculate an ice risk value. In this case, the correction map shown in FIG. 8 is provided, and the icing risk value is corrected according to the correction value of the correction map.

6) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention provides an air conditioning control device for a vehicle that includes a wind glass having a hydrophilic treatment or a water absorption treatment on its inner surface, and is provided with icing risk determination means, and when it is determined that there is a possibility of icing, the wind glass By increasing the ratio of the inside air blown to the inner surface as the vehicle speed is lower, the fuel efficiency of the vehicle can be improved while ensuring the forward visibility of the occupant.

DESCRIPTION OF SYMBOLS 1 Wind glass 1a Anti-fogging film 2 Air conditioner 3a Outside air inlet 3b Inside air inlet 3c Defroster outlet 4 Blower fan 7 Control unit 9 Freezing risk judgment means 11 1st damper V Electric vehicle

Claims (2)

A window glass having a hydrophilic treatment or a water absorption treatment on the inner surface, an inside / outside air switching means capable of switching a mixing ratio between the inside air and the outside air by opening and closing the inside air introduction port and the outside air introduction port; In a vehicle air-conditioning control apparatus comprising a blowing means for blowing air to the inner surface of the window glass, a control means for controlling the inside / outside air switching means and the blowing means,
Freezing risk determination means for determining the possibility that the moisture on the inner surface of the window glass freezes based on at least the vehicle operating state and the in-vehicle state,
An air conditioning control device for a vehicle, wherein when it is determined that there is a possibility of icing, the control means performs an inside air increase control that increases a ratio of inside air blown to the inner surface of the window glass as the vehicle speed decreases.   2. The vehicle air conditioning control device according to claim 1, wherein the control unit performs an inside / outside air switching control for alternately increasing the ratio of the inside air and the outside air a plurality of times immediately after the inside air increase control.