Vehicle

Abstract

To provide a vehicle capable of more surely suppressing fogging of a window while achieving high energy efficiency.SOLUTION: A thin film part 131 and a normal film thickness part 15 which are water absorbing antifogging films are stacked in an in-cabin side face 11a of a front window shield 11. The thin film part 131 has a full amount which is a maximum value of an amount capable of retaining water per unit area lower than that of the normal film thickness part 15. A vehicle includes a camera 132 for detecting occurrence of fogging of the thin film part 131. The vehicle also includes a controller for estimating a water retention amount in the normal film thickness part 15, and an air conditioner for dehumidifying the front window shield 11. When fogging of the thin film part 131 is detected, the controller estimates the water retention amount of the normal film thickness part 15 on the basis of an imaging result of the camera 132. The air conditioner dehumidifies the front window shield 11 on the basis of the estimation result by the controller.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a vehicle, and more particularly to an air conditioning control technique for a vehicle having a structure in which a water-absorbent anti-fogging film is laminated on the interior side of a window. [Background technology]

[0002] In a vehicle, it is important for safety to prevent fogging of windows such as the front windshield to ensure visibility. In order to prevent fogging of the window, a water-absorbent anti-fogging film may be laminated on the inside surface of the window. The water-absorbent anti-fogging film has the function of absorbing moisture into the film to prevent the surface from fogging.

[0003] However, even when a water-absorbent anti-fog film is laminated onto the inside surface of the window in this manner, once the amount of water absorbed by the anti-fog film exceeds a specified amount (full amount), the film will not be able to retain any more moisture, and condensation will adhere to the film surface, causing fogging.

[0004] Patent Document 1 discloses a technology for suppressing fogging on a window formed by laminating a water-absorbent anti-fogging film as described above. The vehicle disclosed in Patent Document 1 integrates the amount of water absorbed by the anti-fogging film. The amount of water absorbed by the anti-fogging film is integrated by sequentially acquiring the temperature of the interior side surface of the window and the dew point temperature near the interior side surface of the window. Then, in the vehicle disclosed in Patent Document 1, when the amount of water absorbed by the anti-fogging film reaches a predetermined threshold, the air conditioner is switched to an outside air introduction mode to perform dehumidification, thereby suppressing fogging of the window. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-35689 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, it is considered difficult to accurately calculate the amount of water absorbed by the anti-fogging film using the technology disclosed in Patent Document 1. That is, the technology disclosed in Patent Document 1 does not take into account the amount of water retained by the anti-fogging film at the time when the accumulation of the amount of water absorbed is started (initial amount of water retained), so if the initial amount of water retained is large, the amount of water retained will reach the full tank amount quickly even if the accumulated amount is the same, and the windows may fog up before the air conditioning mode is switched from the recirculation mode to the outside air introduction mode.

[0007] From the viewpoint of preventing fogging of the windows, it is possible to run the vehicle while dehumidifying the windows by constantly running the air conditioner in the outside air introduction mode, but constantly running the air conditioner in the outside air introduction mode results in low energy efficiency. For example, in cold regions or in winter where the outside air temperature is low, low-temperature, low-humidity outside air is introduced to defog the windows, but in this case, it is necessary to heat the introduced outside air so that the temperature inside the vehicle cabin does not drop too much. In this way, when heating the introduced outside air, a vehicle equipped with an engine can use the exhaust heat from the engine, but an electric vehicle (BEV) that does not have an engine and is driven by an electric motor needs to use the power of the battery to generate heat and heat the outside air. Therefore, in cold regions or in winter, it is difficult to constantly dehumidify the windows (anti-fogging film).

[0008] The present invention has been made to solve the above-mentioned problems, and has an object to provide a vehicle that can more reliably prevent fogging of the windows while achieving high energy efficiency. [Means for solving the problem]

[0009] A vehicle according to one embodiment of the present invention comprises a window that separates the inside and outside of a vehicle compartment, a water-absorbent first anti-fogging film portion laminated over all but a portion of the inside surface of the window facing the vehicle compartment, a water-absorbent second anti-fogging film portion laminated over the portion of the inside surface of the window and having a full tank capacity, which is the maximum amount of water that can be held per unit area, lower than that of the first anti-fogging film portion, a fogging detection portion that detects fogging in the second anti-fogging film portion, an estimation portion that estimates the amount of water held in the first anti-fogging film portion, and an air conditioning unit that dehumidifies the inside surface of the window.

[0010] In the vehicle of the present embodiment, when the fogging detection unit detects fogging in the second anti-fogging film unit, the estimation unit estimates the water retention amount of the first anti-fogging film unit based on the detection information from the fogging detection unit, and the air conditioning device dehumidifies the window based on the estimation result regarding the water retention amount of the first anti-fogging film unit by the estimation unit.

[0011] In the vehicle according to the above aspect, a second anti-fogging film part is laminated on the vehicle-interior surface of the window separately from the first anti-fogging film part, and the fogging detection part is configured to detect fogging of the second anti-fogging film part. Then, when the fogging detection part detects fogging of the second anti-fogging film part, the estimation part detects the water retention amount of the first anti-fogging film part based on the detection information of the fogging detection part.

[0012] In the vehicle according to the present embodiment, the air conditioner dehumidifies the windows based on the estimation result by the estimation unit (the estimation result related to the water retention amount of the first anti-fogging film unit). Therefore, in the vehicle according to the present embodiment, the fogging of the second anti-fogging film unit, which has a lower full tank amount than the first anti-fogging film unit, is detected and the water retention amount of the first anti-fogging film unit is estimated using the detection information, so that the time when the first anti-fogging film unit will fog up or the time immediately before it can be accurately estimated.

[0013] Therefore, in the vehicle according to this aspect, it is possible to more reliably prevent fogging of the windows while achieving high energy efficiency.

[0014] In the vehicle according to the above aspect, when fogging is detected on the vehicle interior side of the second anti-fogging film portion, the estimation unit may estimate the water retention amount of the first anti-fogging film portion by performing the following processes: calculating an initial water retention rate in the second anti-fogging film portion; calculating an initial water retention amount in the first anti-fogging film portion using the initial water retention rate of the second anti-fogging film portion and the full tank amount of the first anti-fogging film portion; and adding an integrated value calculated from the amount of water vapor in the air in the vehicle cabin to the initial water retention amount.

[0015] In the vehicle of the above aspect, when the fogging detection unit detects fogging in the second anti-fogging film unit, the estimation unit calculates the initial water retention rate of the second anti-fogging film unit based on the detection information, and uses this to calculate the initial water retention amount of the first anti-fogging film unit.

[0016] In the vehicle according to this embodiment, the estimation unit calculates the initial water retention amount of the first anti-fogging film portion as described above, and then adds the water absorption (integrated value) to the initial water retention amount, so that it is possible to accurately estimate the time when the first anti-fogging film portion will fog up, thereby realizing high energy efficiency and more reliably suppressing fogging of the window.

[0017] The vehicle according to the above aspect may further include a surface temperature detector that detects a temperature of the interior side surface of the window, and a humidity detector that detects humidity near the interior side surface of the window. In this case, the estimation unit may calculate the integrated value based on detection information from the surface temperature detector and the humidity detector.

[0018] In the vehicle according to the above aspect, the integrated value is calculated using the surface temperature of the interior side of the window and the humidity near the interior side of the window, so that the amount of water retention in the first anti-fogging film can be accurately estimated by adding the integrated value to the initial water retention amount calculated as above, which is advantageous in reliably suppressing fogging of the window while achieving high energy efficiency.

[0019] In the vehicle according to the above aspect, the second anti-fogging film may be formed to have the same film quality as the first anti-fogging film, but to have a relatively thinner film thickness.

[0020] In the vehicle according to the above aspect, the second anti-fogging film portion is formed with the same film quality as the first anti-fogging film portion and is thinner than the first anti-fogging film portion, so that it is only necessary to manage the film thickness when laminating the film on the interior side of the window. Therefore, in the vehicle according to the above aspect, it is possible to accurately suppress fogging of the first anti-fogging film portion while suppressing an increase in manufacturing costs.

[0021] When the second anti-fogging film has the same film quality as the first anti-fogging film and is thinner than the first anti-fogging film, the initial water retention of the first anti-fogging film and the initial water retention of the second anti-fogging film are the same. This makes it possible to calculate the initial water retention of the first anti-fogging film without performing complicated processing.

[0022] In the vehicle according to the above aspect, the second anti-fogging film may be formed to have the same film thickness and a relatively higher elastic modulus than the first anti-fogging film.

[0023] In the vehicle according to the above aspect, the second anti-fogging film portion has the same film thickness as the first anti-fogging film portion and a higher elastic modulus than the first anti-fogging film portion, so that the second anti-fogging film portion, which has a smaller full tank capacity than the first anti-fogging film portion, can be formed with the same film thickness. Therefore, when the portion where the second anti-fogging film portion is laminated and the surrounding portion where the first anti-fogging film portion is laminated are viewed from inside the vehicle compartment, there is no difference in level, which makes it possible to prevent occupants and the like from feeling that there is a problem in terms of quality.

[0024] The water absorption rate of an anti-fogging film is determined by dividing the affinity between the anti-fogging material and water by the elasticity (crosslink density) of the anti-fogging material, so the higher the elastic modulus of the film, the smaller the full water capacity that can be retained. Therefore, by making the elastic modulus of the second anti-fogging film part higher than that of the first anti-fogging film part, the full water capacity of the second anti-fogging film part can be relatively reduced.

[0025] Furthermore, when the film thickness of the second anti-fogging film portion is the same as that of the first anti-fogging film portion and the elastic modulus is higher than that of the first anti-fogging film portion, the initial water retention rate of the first anti-fogging film portion and the initial water retention rate of the second anti-fogging film portion will not be the same, but the initial water retention rate of the first anti-fogging film portion can be calculated using the humidity in the vehicle cabin based on the initial water retention rate of the second anti-fogging film portion.

[0026] In the vehicle according to the above aspect, the second anti-fogging film portion may have the same film thickness as the first anti-fogging film portion and may be formed using an anti-fogging material having a relatively low affinity for water.

[0027] In the vehicle according to the above aspect, the second anti-fogging film portion has the same film thickness as the first anti-fogging film portion, and is formed using an anti-fogging material that has a lower affinity for water than the first anti-fogging film portion, so that the second anti-fogging film portion, which has a smaller full tank capacity than the first anti-fogging film portion, can be formed with the same film thickness. Therefore, when the portion where the second anti-fogging film portion is laminated and the surrounding portion where the first anti-fogging film portion is laminated are viewed from inside the vehicle compartment, there is no difference in level, which makes it possible to prevent occupants and the like from feeling that there is a problem in terms of quality.

[0028] As described above, the water absorption rate of an anti-fogging film is determined by dividing the affinity between the anti-fogging material and water by the elasticity (crosslink density) of the anti-fogging material, so the lower the affinity of the anti-fogging material in the film to water, the smaller the full water capacity that can be retained. Therefore, by forming the second anti-fogging film part using an anti-fogging material that has a lower affinity to water than the first anti-fogging film part, the full water capacity of the second anti-fogging film can be relatively reduced.

[0029] In addition, even in the case of a second anti-fogging film portion having the same thickness as the first anti-fogging film portion and formed using an anti-fogging material having a lower affinity for water than the first anti-fogging film portion, the initial water retention rate of the first anti-fogging film portion and the initial water retention rate of the second anti-fogging film portion are not the same, but the initial water retention rate of the first anti-fogging film portion can be calculated using the humidity in the vehicle cabin based on the initial water retention rate of the second anti-fogging film portion.

[0030] In the vehicle of the above-mentioned aspect, the vehicle may further include a water-stopping portion provided on the interior side of the window between the first anti-fogging film portion and the second anti-fogging film portion, which prevents moisture from passing between them.

[0031] In the vehicle of the above embodiment, the space between the first anti-fogging film portion and the second anti-fogging film portion is sealed by a water-stopping portion, which prevents moisture from passing between the first anti-fogging film portion and the second anti-fogging film portion, which is advantageous for accurately calculating the initial water retention rate of the second anti-fogging film portion.

[0032] In the vehicle according to the above aspect, the second anti-fogging film portion may include a plurality of anti-fogging film elements each having a different maximum water-holding capacity per unit area, and the fogging detection portion may detect fogging in each of the anti-fogging film elements.

[0033] In the vehicle according to the above aspect, the second anti-fogging film portion includes a plurality of anti-fogging film elements each having a different full capacity, and the fogging detection portion detects the fogging of each of the anti-fogging film elements, so that the initial water retention rate of the second anti-fogging film portion can be calculated with high accuracy. That is, the initial water retention rates of the anti-fogging film elements each having a different full capacity are calculated at the time when they become fogged, and the initial water retention amount of the first anti-fogging film portion is calculated using these plurality of initial water retention rates, so that the calculation can be performed with higher accuracy than when the initial water retention rate of a single second anti-fogging film portion is used to calculate the initial water retention amount of the first anti-fogging film portion.

[0034] In the vehicle of the above-mentioned aspect, the estimation unit may perform the following processes: for each of the plurality of anti-fogging film elements, a process of calculating the full tank amount of the anti-fogging film element when fogging is detected; a process of chronologically storing the full tank amounts of each of the plurality of anti-fogging film elements; a process of calculating a deterioration rate of the plurality of anti-fogging film elements based on a chronological change in the difference in the full tank amounts between the plurality of anti-fogging film elements; and a process of correcting the full tank amount of the first anti-fogging film unit based on the deterioration rate.

[0035] The anti-fogging film laminated on the window deteriorates over time due to exposure to high temperatures, ultraviolet rays, etc. To address this deterioration of the anti-fogging film, in the vehicle according to the above embodiment, the deterioration rate of the multiple anti-fogging film elements is calculated from the difference in the full tank amounts of the multiple anti-fogging film elements, and the full tank amount of the first anti-fogging film portion is corrected based on this, so that even if the first anti-fogging film portion deteriorates over time, the full tank amount of the first anti-fogging film portion, which is the standard for dehumidifying the window, can be accurately estimated. Effect of the Invention

[0036] In the vehicle according to each of the above aspects, fogging of the windows can be reliably suppressed while achieving high energy efficiency. [Brief description of the drawings]

[0037] [Figure 1] 1 is a view of a vehicle according to a first embodiment of the present invention, viewed from the inside of a vehicle compartment as viewed forward. [Diagram 2] 1 is an exploded perspective view showing a partial configuration of an air conditioning control system in a vehicle; [Diagram 3] 4 is a cross-sectional view showing a thin film portion laminated on a front windshield and its surrounding area. FIG. [Figure 4] FIG. 2 is a block diagram showing the configuration of an air conditioning control system. [Diagram 5] FIG. 13 is a diagram for explaining a method for calculating an initial water retention amount in a normal film thickness portion. [Figure 6] 4 is a flowchart showing an air conditioning control method executed by the controller. [Figure 7] 1 is a graph showing the change in water retention amount in a normal thickness portion over time. [Figure 8] FIG. 11 is an exploded perspective view showing a partial configuration of an air conditioning control system provided in a vehicle according to a second embodiment of the present invention. [Figure 9] FIG. 11 is an exploded perspective view showing a partial configuration of an air conditioning control system provided in a vehicle according to a third embodiment of the present invention. [Figure 10]13 is a cross-sectional view showing a thin film portion and its surrounding area in the configuration of an air conditioning control system provided in a vehicle according to a fourth embodiment of the present invention. FIG. [Figure 11] 13 is a flowchart showing an air conditioning control method executed by a controller in a vehicle according to a fourth embodiment. [Figure 12] 13 is a cross-sectional view showing a thin film portion and its surrounding area in the configuration of an air conditioning control system provided in a vehicle according to a fifth embodiment of the present invention. FIG. [Figure 13] FIG. 13 is a block diagram showing the configuration of an air conditioning control system in a vehicle according to a fifth embodiment. [Figure 14] 13 is a graph for explaining a method for estimating deterioration of an anti-fogging film in a vehicle according to a fifth embodiment. [Figure 15] 13 is a graph for explaining a method for estimating deterioration of an anti-fogging film in a modified example of the fifth embodiment. [Figure 16] 13 is a cross-sectional view showing a thin film portion and its surrounding area in the configuration of an air conditioning control system provided in a vehicle according to a sixth embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the present invention is not limited to the embodiment described below except for the essential configuration.

[0039] In the figures used in the following explanation, "FR" indicates the front in the vehicle's fore-and-aft direction, "RR" indicates the rear in the vehicle's fore-and-aft direction, "LH" indicates the left in the vehicle's width direction, "RH" indicates the right in the vehicle's width direction, "UP" indicates the top in the vehicle's vertical direction, and "LO" indicates the bottom in the vehicle's vertical direction.

[0040] [First embodiment] 1. Vehicle 1 Configuration The configuration of a vehicle 1 according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a view seen from inside a vehicle compartment 1a toward the front.

[0041] As shown in Fig. 1, the vehicle 1 includes a seat 14 disposed at the front of the passenger compartment 1a, and an instrument panel 10 formed to extend in the vehicle width direction in front of the seat 14. A front windshield 11 is disposed in the area between the front end portion of the instrument panel 10 and the roof 1b, which is also between the front pillars 1c in the vehicle width direction. The front windshield 11 is a window that separates the inside and outside of the passenger compartment 1a.

[0042] A water-absorbent anti-fogging film is laminated on the interior side (the side facing the vehicle compartment 1a) of the front windshield 11. This will be described later.

[0043] A rearview mirror 12 is disposed in the center of the vehicle width direction at the upper front side of the front windshield 11. A defroster outlet 1d is provided at the front end of the instrument panel 10. Air blown out from the outlet 1d flows upward along the interior side surface of the front windshield 11.

[0044] Furthermore, in the vehicle 1 according to this embodiment, a portion of the configuration of the air conditioning control system 13 is attached to a portion of the interior side surface of the front windshield 11. Specifically, the air conditioning control system 13 is disposed in the upper left portion of the rearview mirror 12. The upper left portion of the rearview mirror 12 is selected as the location for the air conditioning control system 13 because it is a position that is unlikely to obstruct the field of vision of the driver seated in the driver's seat disposed on the right side. Therefore, when the driver's seat is disposed on the left side, it is preferable that the air conditioning control system 13 be disposed in the upper right portion of the rearview mirror 12.

[0045] 2. Configuration of Air Conditioning Control System 13 The configuration of the air conditioning control system 13 will be described with reference to Figures 2 to 4. Figure 2 shows a part of the upper left portion of the rearview mirror 12 on the front windshield 11 and its surrounding configuration in an expanded state.

[0046] As shown in FIG. 2, the air conditioning control system 13 includes a thin film portion (second anti-fogging film portion) 131 laminated on the interior side surface 11a of the front windshield 11, and an image analysis camera (fogging detection portion) 132 arranged inside the thin film portion 131 (on the vehicle interior 1a side).

[0047] As shown in Fig. 3, a normal thickness portion (first anti-fogging film portion) 15 is laminated on the interior side surface 11a of the front windshield 11 except for the area where the thin film portion 131 is laminated. Both the thin film portion 131 and the normal thickness portion 15 are formed of a water-absorbent anti-fogging film. The thin film portion 131 is formed so that its full capacity, which is the maximum amount of water that can be held per unit area, is lower than that of the normal thickness portion 15.

[0048] Specifically, in the vehicle 1 according to this embodiment, the thin film portion 131 has the same film quality as the normal film thickness portion 15, but is formed to have a relatively thin film thickness. 15 A film thickness T that is thinner than 131 The insulating film is formed to have a

[0049] The thin film portion 131 is disposed with a gap G between it and the surrounding normal thickness portion 15. The gap G is provided as a water blocking portion that prevents absorbed moisture from passing between the thin film portion 131 and the normal thickness portion 15. The gap G is set to, for example, about 0.1 to 0.2 mm.

[0050] The image analysis camera 132 is configured to be able to capture an image of the interior side surface 131 a of the thin film portion 131 .

[0051] As shown in FIG. 4, the air conditioning control system 13 further includes a window surface temperature sensor (surface temperature detection unit) 133, a window surface vicinity absolute humidity sensor (humidity detection unit) 134, a controller (estimation unit) 135, and the air conditioner 16.

[0052] The window surface temperature sensor 133 is a sensor that detects the temperature of the interior side surface 11a of the front windshield 11. The window surface vicinity absolute humidity sensor 134 is a sensor that detects the humidity in the vicinity of the interior side surface 11a of the front windshield 11. The air conditioner 16 has a defroster function, and blows air from the air outlet 1d to dehumidify the front windshield 11.

[0053] The controller 135 is configured to include a microprocessor including an MPU / CPU, an ASIC, a ROM, a RAM, etc., and a memory. The controller 135 estimates the water retention amount of the normal film thickness portion 15 based on the various types of detection information obtained by executing firmware, etc., stored in advance in the memory.

[0054] Specifically, the controller 135 imports the image (detection information) captured by the image analysis camera 132 and performs analysis. The image analysis by the controller 135 is performed using, for example, a compression analysis method. The controller 135 has an initial water retention amount calculation unit 1351 that calculates an initial water retention amount of the normal film thickness portion 15 based on the image analysis result, and a water absorption amount integration unit 1352 that increases or decreases an integrated value calculated from the amount of water vapor in the air in the vehicle compartment 1a with respect to the initial water retention amount. The controller 135 issues a command to the air conditioner 16 to dehumidify the front windshield 11 at the time when the vehicle interior side surface 15a (see FIG. 3) of the normal film thickness portion 15 starts to fog up or immediately before that time.

[0055] 3. Method for estimating the amount of water retained in the normal thickness portion 15 A method for estimating the amount of water retention in normal thickness portion 15 using thin film portion 131 will be described with reference to FIGS.

[0056] As described above, the thin film portion 131 is formed to have a smaller full tank amount than the normal thickness portion 15. For this reason, the water retention amount reaches the full tank amount at an earlier stage in the thin film portion 131 than in the normal thickness portion 15. When the water retention amount in the thin film portion 131 reaches the full tank amount, water particles CW adhere to the vehicle inner side surface, causing fogging.

[0057] The controller 135 monitors whether or not fogging has occurred in the thin film portion 131 since the ignition was turned on (step ST1 in FIG. 6). Then, as shown in FIG. 5, when fogging has occurred in the thin film portion 131 (step ST1 in FIG. 6: YES), the controller 135 calculates the initial water retention rate of the thin film portion 131 (step ST2 in FIG. 6). Note that when the film thickness of the thin film portion 131 is the same as that of the normal film thickness portion 15, but is thinner than the normal film thickness portion 15, the initial water retention rates of the thin film portion 131 and the normal film thickness portion 15 are the same.

[0058] Here, when the full capacity of the thin film portion 131 is F131 and the water absorption integral value is IV131, the initial water retention rate M131 of the thin film portion 131 is expressed by the following formula. M131=(F131-IV131) / F131 ···(1)

[0059] The initial water retention calculation unit 1351 of the controller 135 calculates the initial water retention amount of the normal film thickness portion 15 based on the initial water retention rate calculated as above (step ST3 in FIG. 6). This is performed based on the initial water retention rate of the thin film portion 131 and the full amount of the normal film thickness portion 15. Specifically, when the full amount of the normal film thickness portion 15 is F15, the calculation of the initial water retention amount IW15 of the normal film thickness portion 15 by the controller 135 is performed based on the following formula. IW15=F15×M131 (2)

[0060] Next, the water absorption amount integrating unit 1352 of the controller 135 calculates the amount of water vapor in the air in the vehicle interior 1a based on the detection information from the window surface temperature sensor 133 and the window surface absolute humidity sensor 134, and performs integration of the water absorption amount from the calculated amount of water vapor (step ST4 in Figure 6).

[0061] The controller 135 estimates the amount of water retained in the normal film thickness portion 15 by executing the above-mentioned process.

[0062] 4. Defroster operation and water retention in normal film thickness section 15 The relationship between the operation of the defroster in vehicle 1 and the amount of water retained in normal film thickness portion 15 will be described with reference to FIG.

[0063] As shown in Fig. 7, in normal film thickness portion 15, the amount of water retention in the film increases and decreases starting from the initial water retention amount. When the defroster is not in operation, the amount of water retention in normal film thickness portion 15 gradually increases depending on the humidity in the vehicle interior 1a. Note that, although Fig. 7 illustrates the amount of water retention in normal film thickness portion 15 increasing and decreasing in a substantially linear relationship, there may be cases where the change is not necessarily linear due to changes in the amount of water vapor and temperature in the vehicle interior 1a.

[0064] As described above, the controller 135 estimates the amount of water retained in the normal film thickness portion 15 and issues a command to the air conditioner 16 to operate the defroster when the amount of retained water reaches the full tank amount or just before that.

[0065] When the defroster is operated, the amount of water retained in normal film thickness portion 15 gradually decreases to an amount of water retained that corresponds to the degree of dryness caused by the defroster (the humidity of the air blown out by the defroster). In vehicle 1, the amount of water retained in normal film thickness portion 15 increases or decreases depending on whether the defroster is activated or deactivated. In addition, by turning on the defroster, the amount of water retained in thin film portion 131 also gradually decreases to an amount of water retained that corresponds to the degree of dryness caused by the defroster.

[0066] 5.Effects In the vehicle 1 according to this embodiment, a thin film portion 131 having a thickness thinner than that of the normal film thickness portion 15 is laminated on the interior side surface 11a of the front windshield 11, and an image analysis camera 132 is configured to detect fogging of the thin film portion 131. Then, when the controller 135 detects fogging of the thin film portion 131 based on an image captured by the image analysis camera 132, the controller 135 detects the amount of water retention of the normal film thickness portion 15 based on the detection information.

[0067] In vehicle 1, air conditioner 16 dehumidifies front windshield 11 with the defroster on, based on the above estimation result by controller 135 (estimated result regarding the amount of water retention in normal film thickness portion 15). Therefore, in vehicle 1, fogging of thin film portion 131, whose full amount, which is the maximum amount of water retention per unit area, is lower than that of normal film thickness portion 15, is detected, and the amount of water retention in normal film thickness portion 15 is estimated using the detection information, so that the time when normal film thickness portion 15 will become foggy or the time immediately before it can be accurately estimated.

[0068] Therefore, in the vehicle 1, it is possible to more reliably defog the front windshield 11 while achieving high energy efficiency.

[0069] Furthermore, in vehicle 1 according to this embodiment, when it is determined from the image captured by image analysis camera 132 that the thin film portion 131 has become cloudy, controller 135 calculates the initial water retention rate of thin film portion 131 based on the detection information, and uses this to calculate the initial water retention amount of normal thickness portion 15. Note that, when the film quality of thin film portion 131 is the same as that of normal thickness portion 15 and the film thickness of thin film portion 131 is thinner than that of normal thickness portion 15, as in vehicle 1 according to this embodiment, the initial water retention rate of normal thickness portion 15 and the initial water retention rate of thin film portion 131 are the same.

[0070] In the vehicle 1, the controller 135 calculates the initial water retention amount of the normal film thickness portion 15 as described above, and then adds the absorbed water (integrated value) to the initial water retention amount, so that it is possible to accurately estimate the time when the normal film thickness portion 15 will fog up. Therefore, it is possible to more reliably suppress fogging of the front windshield 11 while realizing high energy efficiency.

[0071] In addition, in the vehicle 1 according to this embodiment, an integrated value is calculated using the surface temperature of the interior side surface 11a of the windshield 11 and the humidity in the vicinity of the interior side surface 11a of the windshield 11, so that the amount of water retention in the normal film thickness portion 15 can be accurately estimated successively by adding the integrated value to the initial water retention amount calculated as described above. This is advantageous in reliably suppressing fogging of the windshield 11 while realizing high energy efficiency.

[0072] Furthermore, in the vehicle 1 according to this embodiment, the thin film portion 131 is formed with the same film quality as the normal film thickness portion 15, and is thinner than the normal film thickness portion 15, so that it is only necessary to manage the film thickness when laminating it on the interior side surface 11a of the front windshield 11. Therefore, in the vehicle 1, fogging of the normal film thickness portion 15 can be accurately suppressed while suppressing an increase in manufacturing costs.

[0073] Furthermore, in the vehicle 1 according to this embodiment, the gap G (water-stopping portion) provides a water-tight seal between the normal film thickness portion 15 and the thin film portion 131, thereby preventing moisture from passing between the normal film thickness portion 15 and the thin film portion 131, which is advantageous in accurately calculating the initial water retention rate of the thin film portion 131.

[0074] As described above, in the vehicle 1 according to this embodiment, fogging of the front windshield 11 can be reliably suppressed while achieving high energy efficiency.

[0075] [Second embodiment] A vehicle according to a second embodiment of the present invention will be described with reference to Fig. 8. Fig. 8 shows only a part of the configuration of an air conditioning control system 23 mounted on the vehicle. The same configuration as in the first embodiment is adopted for the configurations not shown in Fig. 8.

[0076] As shown in Fig. 8, the vehicle according to this embodiment includes an air conditioning control system 23 having a light / contour analysis camera 232 and a pattern printed layer 236. The pattern printed layer 236 is a layer in which a light-colored background and a dark-colored pattern are printed, and is formed between the front windshield 11 and the thin film portion 131. Note that the light-colored background is filled in to suppress the foreground from affecting the analysis through the front windshield 11.

[0077] The thin film portion 131 is an antifogging film portion similar to that in the first embodiment.

[0078] The light / contour analysis camera 232 captures an image of the pattern-printed layer 236 through the thin film portion 131. For the captured image of the pattern-printed layer 236, a plurality of captured images are digitized in advance according to the degree of cloudiness of the thin film portion 131, and the controller (estimation unit) uses the digitized data to determine whether the thin film portion 131 is clouded or not.

[0079] In the air conditioning control system 23 mounted on the vehicle according to this embodiment, the configuration used to detect fogging of the thin film portion 131 is different from that of the first embodiment, but the other configurations are the same. Therefore, in this embodiment, the same effects as those of the first embodiment can be obtained.

[0080] In addition, in this embodiment, a pattern printed layer 236 is interposed between the front windshield 11 and the thin film portion 131, so that the foreground of the front windshield 11 can be prevented from affecting the detection of fogging of the thin film portion 131 in the image captured by the light / contour analysis camera 232.

[0081] In this embodiment, a camera for a drive recorder can be used instead of the light / contour analysis camera 232. In this case, by using the camera for the drive recorder also as a camera for detecting fogging of the thin film portion 131, it is possible to suppress an increase in manufacturing costs and to keep the space occupied by the system 23 small.

[0082] Furthermore, the area where the thin film portion 131 and the pattern printed layer 236 are arranged may be the lower left and right corners of the front windshield 11, rather than the upper center thereof, as long as the driver's field of vision is not obstructed.

[0083] [Third embodiment] A vehicle according to a third embodiment of the present invention will be described with reference to Fig. 9. Fig. 9 shows only a schematic diagram of a portion of the configuration of an air conditioning control system 33 mounted on the vehicle. The same configuration as in the first embodiment is adopted for the configurations not shown in Fig. 9.

[0084] 9, the vehicle according to this embodiment includes an air conditioning control system 33 having a photodiode array 332, a mirror layer 337, and a spot light source 338. The mirror layer 337 is formed in a region facing the thin film portion 131 of the outer surface 11b of the front windshield 11 and in its periphery. The surface of the mirror layer 337 facing the outer surface 11b of the front windshield 11 is configured as a light reflective surface.

[0085] The spot light source 338 emits visible light L R The light L emitted from the spot light source 338 is emitted from the vehicle interior side surface 15a of the normal film thickness portion 15 toward the mirror layer 337. R The light L is transmitted through the normal thickness portion 15 and the front windshield 11 and is reflected by the mirror layer 337 into the interior of the vehicle. R The light passes through the front windshield 11 and the thin film portion 131 and enters the photodiode array 332 .

[0086] The photodiode array 332 is a module in which a plurality of light receiving elements are arranged in a line, and is provided as a fogging detection unit that detects fogging on the vehicle interior side surface 131 a of the thin film portion 131 .

[0087] When the inside surface 131a of the thin film portion 131 is not clouded, the light L reflected by the mirror layer 337 RThe light L is not scattered by the thin film portion 131 and remains in a spot state and is incident on the photodiode array 332. Therefore, the light L is incident on only some of the light receiving elements arranged in a line. R is incident.

[0088] On the other hand, when the inside surface 131a of the thin film portion 131 is fogged up, the light L reflected by the mirror layer 337 R The light L is scattered by the thin film portion 131 and enters the photodiode array 332. Therefore, the light L reaches more light receiving elements than in the case where there is no scattering. R is incident.

[0089] In the vehicle air conditioning control system 33 according to this embodiment, whether or not fogging has occurred on the interior side surface 131a of the thin film portion 131 is detected based on the above-mentioned light receiving state of the photodiode array 332.

[0090] In the air conditioning control system 33 mounted on the vehicle according to this embodiment, the configuration used to detect fogging of the thin film portion 131 is different from that of the first embodiment, but the other configurations are the same. Therefore, in this embodiment, the same effects as those of the first embodiment can be obtained.

[0091] In addition, in this embodiment, whether the vehicle interior side surface 131a of the thin film portion 131 is fogged up or not can be detected based on the difference in the light receiving state of the photodiode array 332, so there is no need to perform image analysis using an image captured by a camera as in the first embodiment, and the system can be simplified. This is advantageous in suppressing an increase in manufacturing costs.

[0092] In this embodiment, the light L emitted from the spot light source 338 R In the above embodiment, the light L emitted from the spot light source 338 is reflected by the mirror layer 337 after passing through the normal thickness portion 15. However, the present invention is not limited to this. For example, the light L emitted from the spot light source 338 is RIt is also possible to make the light pass through the thin film portion 131, be reflected by the mirror layer 337, and be incident on the photodiode array 332. This makes it possible to reduce the area of ​​the mirror layer 337, which is less likely to obstruct the driver's field of vision and is advantageous in suppressing an increase in manufacturing costs.

[0093] In addition, the light L emitted from the spot light source 338 R Regarding the light, it is not limited to visible light, and it is also possible to adopt, for example, near-infrared light.

[0094] [Fourth embodiment] A vehicle according to a fourth embodiment of the present invention will be described with reference to Fig. 10 and Fig. 11. Fig. 10 shows only a part of the configuration of an air conditioning control system 43 mounted on the vehicle. The same configuration as that of the first embodiment is adopted for the configurations not shown in Fig. 10.

[0095] As shown in FIG. 10, the air conditioning control system 43 of this embodiment includes a thin film portion 431 composed of a plurality of anti-fogging film elements 4311 to 4315. Each of the plurality of anti-fogging film elements 4311 to 4315 has a thickness T 15 A film thickness T that is thinner than 4311 ,T 4312 ,T 4313 ,T 4314 ,T 4315 The anti-fogging film elements 4311 to 4315 have a thickness T 4311 ,T 4312 ,T 4313 ,T 4314 ,T 4315 are formed differently.

[0096] Specifically, the thickness T of the anti-fogging film element 4312 4312 is the thickness T of the anti-fogging film element 4311 4311 Similarly, the thickness T 4313 is the thickness T of the anti-fogging film element 4312 4312 The anti-fogging film element 4314 is formed thicker than the film thickness T 4314 is the thickness T of the anti-fogging film element 43134313 The anti-fogging film element 4315 is formed thicker than the film thickness T 4315 is the thickness T of the anti-fogging film element 4314 4314 It is formed thicker than

[0097] Hereinafter, anti-fogging film element 4311 may be referred to as #1 thin film portion 4311, anti-fogging film element 4312 as #2 thin film portion 4312, anti-fogging film element 4313 as #3 thin film portion 4313, anti-fogging film element 4314 as #4 thin film portion 4314, and anti-fogging film element 4315 as #5 thin film portion 4315.

[0098] Also, gaps serving as water stopping portions are provided between the anti-fogging film elements 4311-4315. Furthermore, gaps serving as water stopping portions are provided between the anti-fogging film elements 4311-4315 and the normal thickness portion 15. This prevents moisture from passing between the anti-fogging film elements 4311-4315 and between the anti-fogging film elements 4311-4315 and the normal thickness portion 15.

[0099] In Figure 10, the illustration of the fogging detection unit that detects the occurrence of fogging on the interior sides 4311a, 4312a, 4313a, 4314a, 4315a of each of the anti-fogging film elements 4311-4315 is omitted, but as in the first embodiment described above, a camera for image analysis is arranged on the interior side of the anti-fogging film elements 4311-4315.

[0100] The controller (estimation unit) estimates the amount of water retention in the normal thickness portion 15 based on the detected occurrence of fogging of the anti-fogging film elements 4311-4315, and based on the estimation result, issues a command to the air conditioning unit to dehumidify the front windshield at the time when fogging occurs on the interior side surface 15a of the normal thickness portion 15, or just before that occurs.

[0101] 11, in estimating the amount of water retention in the normal film thickness portion 15, the controller first selects the #1 thin film portion 4311 as a target for monitoring the occurrence of fogging (step ST11). Then, the controller monitors the occurrence of fogging on the interior side surface 4311a of the #1 thin film portion 4311 (step ST12).

[0102] When the controller determines that fogging has occurred on the interior side surface 4311a of the #1 thin film portion 4311 (step ST12: YES), the controller calculates the initial water retention rate of the #1 thin film portion 4311 (step ST13). The method of calculating the initial water retention rate is the same as that of the first embodiment. Then, the controller stores the calculated initial water retention rate of the #1 thin film portion 4311 in a memory.

[0103] The controller executes the processes of steps ST12 and ST13, with the #2 thin film portion 4312 as the monitoring target (step ST15). The controller repeats the processes of steps ST12 and ST13 until the initial water retention rate of the #5 thin film portion 4315 is calculated (step ST14: NO).

[0104] When the controller finishes calculating the treated water retention rates of the #1 thin film portion 4311 to the #5 thin film portion 4315 (step ST14: YES), it calculates the initial water retention capacity of the normal film thickness portion 15 based on the initial water retention rates of the #1 thin film portion 4311 to 4315 stored in the memory (step ST16), and accumulates the water absorption (accumulated value) relative to the initial water retention capacity (step ST17).

[0105] In addition, when calculating the initial water retention amount of normal thickness portion 15 using the initial water retention rates of #1 thin film portion 4311 to #5 thin film portion 4315, the initial water retention rates of #1 thin film portion 4311 to #5 thin film portion 4315 may be arithmetically averaged or weighted. For example, the initial water retention rate of #5 thin film portion 4315, which has the closest thickness to normal thickness portion 15 among #1 thin film portion 4311 to #5 thin film portion 4315, may be weighted the most highly.

[0106] The air conditioning control system 43 mounted on the vehicle according to this embodiment differs from the first embodiment in that a thin film section 431 composed of a plurality of anti-fogging film elements 4311-4315 is used, but the other configurations are the same. Therefore, this embodiment can obtain the same effects as the first embodiment.

[0107] Furthermore, in the air conditioning control system 43 mounted on the vehicle according to this embodiment, the thin film portion 431 is made up of a plurality of anti-fogging film elements 4311-4315 having different fill-up amounts, and the fogging of each of the anti-fogging film elements 4311-4315 is detected, so that the initial water retention amount of the normal film thickness portion 15 can be calculated with high accuracy. That is, the initial water retention rate of each of the anti-fogging film elements 4311-4315 having different fill-up amounts is calculated at the time when each of them becomes fogged, and the initial water retention rate of the normal film thickness portion 15 is calculated using these multiple initial water retention rates, so that the calculation can be performed with higher accuracy than when the initial water retention rate of one thin film portion is used to calculate the initial water retention amount of the normal film thickness portion 15.

[0108] [Fifth embodiment] An air conditioning control system 53 mounted on a vehicle according to a fifth embodiment of the present invention will be described with reference to Fig. 12 to Fig. 14. Fig. 12 shows only a schematic diagram of a portion of the configuration of the air conditioning control system 53 mounted on the vehicle. The same configuration as in the first embodiment is adopted for the configurations not shown in Fig. 12.

[0109] As shown in Fig. 12, the air conditioning control system 53 of this embodiment includes a thin film portion 531 composed of a plurality of anti-fogging film elements 5311, 5312. Each of the plurality of anti-fogging film elements 5311, 5312 has a thickness T 15 A film thickness T that is thinner than 5311 ,T 5312 The anti-fogging film element 5312 has a thickness T 5312 is the thickness T of the anti-fogging film element 5311 5311 It is formed thicker than

[0110] In this embodiment as well, a gap serving as a water stopping portion is provided between the anti-fogging film element 5311 and the anti-fogging film element 5312. Furthermore, a gap serving as a water stopping portion is provided between the anti-fogging film elements 5311, 5312 and the normal thickness portion 15. This suppresses the movement of moisture between the anti-fogging film element 5311 and the anti-fogging film element 5312 and between the anti-fogging film elements 5311, 5312 and the normal thickness portion 15.

[0111] In Figure 12, the illustration of the fogging detection unit that detects the occurrence of fogging on the interior sides 5311a, 5312a of the anti-fogging film elements 5311, 5312, respectively, is omitted, but as in the first embodiment described above, a camera for image analysis is arranged on the interior side of the anti-fogging film elements 5311, 5312.

[0112] 13, an initial water retention amount calculation unit 1351 of the controller (estimation unit) 535 calculates the initial water retention amount of the normal film thickness unit 15 based on the detected occurrence of fogging of the anti-fogging film elements 5311, 5312. Then, a water absorption integration unit 1352 of the controller 535 increases or decreases an integrated value calculated from the amount of water vapor in the air in the vehicle interior 1a with respect to the initial water retention amount. These processes are the same as those in the first embodiment.

[0113] The controller 535 of this embodiment has a deterioration rate calculation unit 5353 in addition to the initial water retention amount calculation unit 1351 and the water absorption integration unit 1352. The deterioration rate calculation unit 5353 stores information about the full tank amount in an initial state in which the anti-fogging film elements 5311, 5312 are not deteriorated. The deterioration rate calculation unit 5353 calculates the deterioration rate of the anti-fogging film as follows.

[0114] First, in this embodiment, the antifogging film element 5311 is formed to be thinner than the antifogging film element 5312. Therefore, the antifogging film element 5311 starts to fog up earlier than the antifogging film element 5312. In the following, the antifogging film element 5311 will be referred to as the "first element 5311," and the antifogging film element 5312 will be referred to as the "second element 5312."

[0115] The full amount of the first element 5311 is F1, and the full amount of the second element 5312 is F2. In addition, the amounts of water absorbed at the beginning of fogging in the first element 5311 and the second element 5312 are WA1 and WA2, respectively. In this case, the full amounts F1 and F2 satisfy the following relationship. F2-F1=WA2-WA1 (3)

[0116] Next, FIG. 14 shows the relationship between the water absorption amount and the water retention amount of the first element 5311 and the second element 5312, with the water absorption amount on the horizontal axis and the water retention amount on the vertical axis. As shown in FIG. 14, when the time when the first element 5311 starts to fog is taken as a reference, the water absorption amount and the water retention amount at the time when the second element 5312 starts to fog are reduced from the initial value (state without deterioration) due to deterioration. That is, when the anti-fogging film deteriorates, both the water absorption amount and the water retention amount decrease from point P1 to point P2 on the water absorption amount-water retention amount relationship line LN. The deterioration rate calculation unit 5353 calculates the deterioration rate DR of the anti-fogging film based on the change from point P1 to point P2 in FIG. 14. Specifically, the deterioration rate DR is calculated as the reduction rate of the difference in the full tank amount between the first element 5311 and the second element 5312.

[0117] The full amount of the first element 5311 in a non-deteriorated state is FI1, and the full amount of the second element 5312 in a non-deteriorated state is FI2. Also, the full amount of the first element 5311 at the present time (in a deteriorated state) is FM1, and the full amount of the second element 5312 at the present time (in a deteriorated state) is FM2. In this case, the following equation is established. (FM2-FM1)=(FI2-FI1)×(1-DR) ···(4)

[0118] In the above relational equation, DR=0 indicates a state without deterioration, and DR=1 indicates a state in which water retention capacity has been lost due to deterioration.

[0119] Furthermore, the amount of water absorption when the first element 5311 starts to fog in a non-deteriorated state is defined as WAI1, and the amount of water absorption when the second element 5312 starts to fog in a non-deteriorated state is defined as WAI2. The amount of water absorption when the first element 5311 starts to fog in a deteriorated state is defined as WAM1, and the amount of water absorption when the second element 5312 starts to fog in a deteriorated state is defined as WAM2. In this case, the deterioration rate calculation unit 5353 calculates the deterioration rate DR of the anti-fogging film based on the following formula. DR=(WAM2-WAM1) / (WAI2-WAI1) ···(5) In the air conditioning control system 53 of this embodiment, the controller 535 corrects the full amount of the normal thickness portion 15 based on the deterioration rate DR calculated by the deterioration rate calculation unit 5353 as described above. That is, the deterioration rate DR of the anti-fogging film calculated using the first element 5311 and the second element 5312 is applied to the normal thickness portion 15 to estimate the full amount of the normal thickness portion 15 at the present time.

[0120] In this embodiment, the deterioration rate of the anti-fogging film is calculated using the thin film portion 531 having the anti-fogging film elements 5311 and 5312 at two locations, but the deterioration rate of the anti-fogging film may be calculated using a thin film portion having anti-fogging film elements at three or more locations, which can improve the accuracy of the calculation of the deterioration rate.

[0121] As described above, the vehicle according to this embodiment differs from the first embodiment in that the thin film portion 531 has two anti-fogging film elements 5311, 5312, and the deterioration rate calculation unit 5353 of the controller 535 calculates the deterioration rate of the anti-fogging film using these elements 5311, 5312, but the other configurations are the same. Therefore, the present embodiment can also provide the same effects as the first embodiment.

[0122] [Variation 1] A deterioration rate calculation method according to a modification of the fifth embodiment will be described with reference to FIG.

[0123] 15, the difference between the amount of water absorption when the second element 5312 of the thick film starts to fog and the amount of water absorption when the first element 5311 of the thin film starts to fog is plotted over time. In this case, the difference in the amount of water absorption gradually decreases with deterioration of the anti-fogging film.

[0124] In this modification, the difference in the amount of water absorbed between the first element 5311 and the second element 5312 (the amount of water absorbed at the time when fogging begins) is tracked over time, and the deterioration rate of the anti-fogging film can be calculated based on this.

[0125] [Variation 2] As a modification of the fifth embodiment, the denominator in the above relational expression (5) is changed to the moisture retention property of the anti-fogging film material used and the film thickness T 5311 and the thickness T of the second element 5312 5312 (See FIG. 12.)

[0126] [Sixth embodiment] A vehicle according to the sixth embodiment of the present invention will be described with reference to Fig. 16. Fig. 16 shows only a part of the configuration of an air conditioning control system 63 mounted on the vehicle. The same configuration as that of the first embodiment is adopted for the configurations not shown in Fig. 16.

[0127] As shown in FIG. 16, the air conditioning control system 63 of this embodiment is equipped with a water-absorbent anti-fogging film consisting of a thin film portion 131 laminated on a partial area of ​​the interior side surface 11a of the front windshield 11 and a normal thickness portion 15 laminated around it.

[0128] In the above-described first embodiment and the like, a gap G is provided between the thin film portion 131 and the normal thickness portion 15 to stop water, but in this embodiment, a water stopping layer 639 is formed between the thin film portion 131 and the normal thickness portion 15. The water stopping layer 639 is formed of a hydrophobic material (e.g., a fluororesin material). In this way, by providing the water stopping layer 639 between the thin film portion 131 and the normal thickness portion 15, it is possible to suppress the movement of water between the thin film portion 131 and the normal thickness portion 15, which is advantageous in accurately calculating the initial water retention rate of the thin film portion 131.

[0129] This embodiment differs from the first embodiment in that a water blocking layer 639 is formed between the thin film portion 131 and the normal film thickness portion 15, but the other configurations are the same as those of the first embodiment. Therefore, this embodiment can also obtain the same effects as the first embodiment.

[0130] [Other variations] In the first to sixth embodiments, thin film portion 131, 431, 531 that is thinner than normal film thickness portion 15 is provided to calculate the initial water retention rate, but the present invention only requires that an anti-fogging film portion that has lower water absorption in a portion of the windshield than in other portions. For example, a second anti-fogging film portion used to calculate the initial water retention rate may be formed so as to have the same film thickness as the first anti-fogging film portion and a relatively higher elastic modulus.

[0131] In addition, the second anti-fogging film portion used in calculating the initial water retention rate can also be formed by forming it from an anti-fogging material that has the same thickness as the first anti-fogging film and a relatively low affinity for water.

[0132] As described above, by making the film thickness of the second anti-fogging film portion the same as that of the first anti-fogging film portion and making the elastic modulus higher than that of the first anti-fogging film portion, or by forming the second anti-fogging film from an anti-fogging material that has a lower affinity for water than the first anti-fogging film, it is possible to form a second anti-fogging film portion with the same film thickness and a smaller full tank amount, which is the maximum amount of water retained per unit area, than the first anti-fogging film portion. Therefore, when the portion where the second anti-fogging film portion is laminated and the surrounding portion where the first anti-fogging film portion is laminated are viewed from inside the vehicle compartment, there is no difference in level, which makes it possible to prevent occupants and the like from feeling that there is a problem in terms of quality.

[0133] The water absorption rate of the anti-fogging film is determined by dividing the affinity between the anti-fogging material and water by the elasticity (crosslink density) of the anti-fogging material, so the higher the elastic modulus of the film, the smaller the full capacity (maximum amount of water that can be retained). Therefore, by making the elastic modulus of the second anti-fogging film part higher than that of the first anti-fogging film part, the full capacity of the second anti-fogging film part can be relatively reduced.

[0134] Here, if the film thickness of the second anti-fogging film portion is the same as that of the first anti-fogging film portion and the elastic modulus is higher than that of the first anti-fogging film portion, or the second anti-fogging film portion is made of an anti-fogging material that has a lower affinity for water than the first anti-fogging film portion, the initial water retention rate of the first anti-fogging film portion and the initial water retention rate of the second anti-fogging film portion will not be the same, but the initial water retention rate of the first anti-fogging film portion can be calculated using the humidity in the vehicle cabin based on the initial water retention rate of the second anti-fogging film portion.

[0135] Furthermore, in the first to sixth embodiments, an anti-fogging film is laminated on the front windshield 11, but the present invention can be widely applied to windows such as side windows and rear windows.

[0136] In the first to sixth embodiments, the size of the laminated region of the thin film portions 131, 431, and 531 is not specifically mentioned, but it may be, for example, a few centimeters square. This allows the initial water retention to be calculated accurately.

[0137] In the first to sixth embodiments, whether or not the thin film portion 131, 431, 531 is fogged up is determined using the camera 132, 232 or the photodiode array 332, but the present invention may electrically detect the foggy state of the thin film portion 131, 431, 531. For example, the occurrence of foggy state in the thin film portion may be detected based on a change in capacitance or a change in electrical resistance.

[0138] In the first to sixth embodiments, the initial water retention amount of the normal film thickness portion 15 is estimated when the ignition is turned on, but the present invention is not limited to this. For example, the initial water retention amount of the normal film thickness portion may be estimated each time the defroster dehumidifies the window. This allows for more accurate estimation.

[0139] Furthermore, in the first to sixth embodiments, no particular reference is made to the type of drive source equipped in the vehicle 1, but the present invention can be applied to vehicles equipped with various drive sources. For example, the present invention can be widely applied to vehicles that are driven by an engine, parallel hybrid vehicles, range extender hybrid vehicles, vehicles that run by driving a motor with electric power from a battery (BEV), and the like. [Explanation of symbols]

[0140] 1 vehicle 11 Front windshield (wind) 13,23,33,43,53,63 Air conditioning control system 15 Normal film thickness section (first anti-fogging film section) 16 Air conditioner 131,431,531 Thin film part (second anti-fogging film part) 132 Image analysis camera (cloudiness detection section) 133 Window surface temperature sensor (surface temperature detection unit) 134 Absolute humidity sensor near the window surface (humidity detection section) 135,535 Controller (Estimation section) 232 Light / shade / contour analysis camera (cloudiness detection section) 332 Photodiode array (cloudiness detection section) 338 Spot light source (light source)

Claims

1. A window that separates the inside and outside of the vehicle compartment; a water-absorbent first anti-fogging film portion laminated on the window except for a part of the interior surface of the window facing the passenger compartment; a second anti-fogging film part that is laminated on the partial region of the vehicle interior side of the window and has a water absorption capacity lower than that of the first anti-fogging film part, the water absorption capacity being a maximum water retention capacity per unit area; A fog detector for detecting fog in the second anti-fogging film portion; an estimation unit that estimates a water retention amount in the first anti-fogging film unit; an air conditioner that dehumidifies the interior side of the window; Equipped with When the fogging detection unit detects fogging in the second anti-fogging film unit, the estimation unit estimates a water retention amount of the first anti-fogging film unit based on detection information from the fogging detection unit, The air conditioner dehumidifies the window based on a result of the estimation by the estimation unit regarding a water retention amount of the first anti-fogging film portion. vehicle.

2. The estimation unit is a process of calculating an initial water retention rate of the second anti-fogging film portion when fogging is detected on the vehicle interior surface of the second anti-fogging film portion; calculating an initial water retention amount of the first anti-fogging film portion using the initial water retention rate of the second anti-fogging film portion and the full tank amount of the first anti-fogging film portion; adding an integrated value calculated from the amount of water vapor in the air in the vehicle cabin to the initial water retention amount; to estimate the water retention amount of the first anti-fogging film portion.

2. The vehicle of claim 1.

3. a surface temperature detection unit for detecting a temperature of the interior side surface of the window; a humidity detection unit that detects humidity in the vicinity of the vehicle interior side of the window; Further equipped with The estimation unit calculates the integrated value based on each piece of detection information from the surface temperature detection unit and the humidity detection unit.

3. A vehicle as claimed in claim 2.

4. The second antifogging film portion has the same film quality as the first antifogging film portion and is formed to have a relatively thin film thickness. A vehicle according to any one of claims 1 to 3.

5. The second anti-fogging film portion is formed to have the same film thickness and a relatively high elastic modulus as the first anti-fogging film portion. A vehicle according to any one of claims 1 to 3.

6. The second anti-fogging film portion has the same film thickness as the first anti-fogging film portion and is formed using an anti-fogging material having a relatively low affinity for water. A vehicle according to any one of claims 1 to 3.

7. A water-stopping portion is provided on the interior side surface of the window between the first anti-fogging film portion and the second anti-fogging film portion to prevent moisture from passing between them. A vehicle according to any one of claims 1 to 3.

8. The second anti-fogging film portion includes a plurality of anti-fogging film elements each having a different full capacity, which is a maximum amount of water that can be retained per unit area; The fogging detection unit detects fogging in each of the plurality of anti-fogging film elements. A vehicle according to any one of claims 1 to 3.

9. The estimation unit is calculating the full tank amount of each of the anti-fogging film elements when fogging is detected; A process of storing the full tank amount of each of the plurality of anti-fogging film elements in chronological order; A process of calculating a deterioration rate of the plurality of anti-fogging film elements based on a time-series change in the difference in the full tank amount between the plurality of anti-fogging film elements; A process of correcting the full tank amount of the first anti-fogging film portion based on the deterioration rate; Execute 9. The vehicle of claim 8.

Images