KR101170608B1 - A control method for defogging of windows in vehicles - Google Patents

Abstract

The present invention provides a method for determining a defogging start time of a vehicle window to prevent fogging of a vehicle window, and determining a defogging start time and operating a defogging means when the defogging start time is reached. A method for controlling defogging of a vehicle window, the method comprising: detecting a current humidity around an inner surface of a window from a humidity sensor installed in proximity to the window; Detecting the outside air temperature from the outside air temperature sensor; Calculating a fog generation index (FP) by receiving the detected current window humidity and outdoor temperature; Determining that the starting point of defogging has been reached when the calculated value of the calculated fog occurrence index FP exceeds a predetermined reference value, and operating the defogging means. The calculation function (f) for calculating, characterized in that made by reflecting the fog generation reference humidity set to vary according to the size of the outside temperature,

According to the defogging control method of the present invention, it is possible to improve the accuracy of the fog generation index, that is, the fog generation prediction value, and to determine the defogging start time according to the fog generation prediction value and defogging when the defogging start time is reached. By operating the ging means, it is possible to prevent fogging of the vehicle window in advance.

 Humidity, defogging, method, fogging, window, outside temperature, vehicle speed

Description

A control method for defogging of windows in vehicles}

The present invention relates to a defogging control method of a vehicle window, and more particularly, to determine a defogging start time of a vehicle window, and to determine the defogging start time and to defogging when the defogging start time is reached. The present invention relates to a method for controlling defogging of a vehicle window so as to prevent fogging of the vehicle window.

In general, since there is a temperature difference between the inside and the outside of the vehicle, when the humidity is high, the condensation of water vapor occurs in the window of the vehicle, thereby causing a fogging phenomenon.

Therefore, most vehicles are equipped with a defobbing system for removing fog by using air discharged through a defrost duct of an air conditioner when fog is generated.

This defogging system detects fog in the window early and suppresses the generation of fog, and eliminates it early when fog occurs, thereby enhancing the driver's safety and ensuring comfort by ensuring a smooth watch. .

In order to perform defogging, a driver or a passenger who rides on a minority seat was manually manipulated to operate an air conditioner or a heater. However, since the defogging method by manual operation is cumbersome in operation, there is a problem in safe driving. Recently, when fog is expected to be detected in the window of a vehicle, if a fog is expected or when a fog occurs, the defogging system is automatically activated to suppress the occurrence of fog and to remove already generated fog. Techniques are being developed to help.

However, the technologies developed to date can predict the generation of fog to some extent, but there is a problem that the accuracy and responsiveness of the prediction of fog generation are not high as compared with the actual generation of fog.

The present invention was created to solve the above problems, and can improve the accuracy of the fog generation index, that is, the fog generation prediction value, and determine the starting point of defogging according to the fog occurrence prediction value to reach the defogging start time. In one case, an object of the present invention is to provide a method for controlling defogging of a vehicle window in which the defogging means can be prevented in advance.

The present invention for achieving the above object, the step of determining the defogging start time of the vehicle window to prevent fogging of the vehicle window, and when the defogging start time is determined by determining the defogging start time A method of controlling defogging of a vehicle window, comprising: operating a defogging means, the method comprising: detecting a current humidity around an inner surface of a window from a humidity sensor installed in proximity to the window; Detecting the outside air temperature from the outside air temperature sensor; Calculating a fog generation index (FP) by receiving the detected current window humidity and outdoor temperature; Determining that the starting point of defogging has been reached when the calculated value of the calculated fog occurrence index FP exceeds a predetermined reference value, and operating the defogging means. The calculation function f for calculating is characterized in that it is made by reflecting the fog generation reference humidity set to vary according to the magnitude of the outside temperature.

According to the defogging control method of the vehicle window according to the present invention, it is possible to expect the accuracy of the fog occurrence index, that is, the prediction value of the fog generation, and to determine the defogging start time according to the fog occurrence prediction value and reach the defogging start time. By operating the defogging means, it is possible to prevent fogging of the vehicle window in advance.

In addition, since the defogging control method of the present invention utilizes the fact that the fog generation humidity varies according to the outside air temperature, the accuracy of the fog generation prediction value can be improved by reflecting the fog generation reference humidity set to be variable to the size of the outside air temperature. Therefore, defogging is performed in advance before a fogging phenomenon occurs, thereby enhancing the comfort of the driver as well as improving the comfort of a smooth watch.

In addition, the present invention further reflects the amount of change in the outside air temperature according to the vehicle speed, thereby improving the accuracy of the fog generation prediction value. In addition to promoting safety, comfort is also improved.

Hereinafter, a preferred embodiment of a defogging control method of a vehicle window according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing the internal configuration of a vehicle air conditioner for explaining the defogging means applied to the present invention, Figure 2 is a block diagram for implementing a defogging control method according to the present invention, Figure 3 is an outside temperature Is a graph showing the fog generation reference humidity (TH1, TH2) is set to vary according to the size of the present invention, Figure 4 is a view of the sensor is installed the main component of the present invention, Figure 5 shows a defogging control method of the present invention Flowchart.

As a system for implementing a defogging control method according to the present invention, as shown in FIG. 2, a humidity sensor installed near the window 60 to detect a current humidity around the inner surface 61 of the window 60 ( 10) (see FIG. 4), an outside air temperature sensor 20 for detecting outside air temperature, that is, an outside air temperature around the surface of the window 60, 62, a humidity sensor 10 and an outside air temperature sensor 20 The control unit 30 that receives the detection signal detected by the control unit 30 and determines that it is the starting point of defogging, and when it is determined that the starting point of defogging is determined by the classification of the control unit 30, It consists of the defogging means 40 which discharges air to a window side.

The defogging means 40 is provided together with the vehicle air conditioner 50, which will be described below with reference to FIG. 1.

The vehicle air conditioner 50 includes an air conditioner case 51 having an indoor / outdoor air inlet 52 through which indoor and outdoor air is selectively introduced by an intake door (not shown) and a plurality of vents 53, 54, and 55. It is provided between the evaporator 57 provided in the air inlet 52 side of the case 51, the heater core 58 provided in the rear side of this evaporator 57, and between the evaporator 57 and the heater core 58. And a vent door 56a, 57c, 56b for opening / closing the vents 53, 54, 55 for changing the air flow path.

The plurality of vents 53, 54, and 55 may include floor vents 53 for discharging air to the bottom of the vehicle, face vents 55 for discharging air to the driver's face, and the front window of the vehicle. It is divided into a defrost vent 54 for discharging air, and vent doors 56a, 57c, and 56b are installed at the inlets of the vents 53, 54, and 55, respectively. , 54, 55 will be opened and closed.

Therefore, the defogging means 40 of the present invention is configured to be discharged through the defrost vent 54 in order to prevent the fogging phenomenon in the window, but the defogging means 40 is also provided in the intake door. To allow the outdoor air to enter the interior of the vehicle, or to open the defrost door 57c to open the defrost vent 54, or to turn on the air conditioner to drive the compressor, or to discharge the gas into the room by a blower. It can also be configured to perform at least one of the amount of air to be increased.

In addition, although the outside temperature sensor 20 is not shown in FIG. 4, a conventionally known sensor for detecting the outside temperature of the vehicle may be used. This is because the outside temperature of the vehicle is approximately equal to the temperature around the surface 62 of the window 60.

On the other hand, the present invention can be applied to further reflect the information detected by the vehicle speed sensor 50, of course.

The defogging control method using the system for implementing the defogging control method of the present invention configured as described above will be described with reference to FIG.

Defogging control method of the present invention is the start point of defogging based on the calculation value of the fog generation index calculated by reflecting the fog generation reference humidity set to vary according to the current humidity, the outside temperature, the size of the outside temperature of the window 60 In this case, the defogging means 40 is operated when the defogging start time has been reached. In other words, when the defogging start point is reached according to the fog occurrence prediction value, that is, the fog occurrence index, the defogging means 40 is operated to prevent fogging of the vehicle window in advance. It is.

In more detail, the control unit 30 detects a current humidity at a certain time around the inner surface 61 of the window 60 from the humidity sensor 10 installed close to the window 60, and the outside air temperature sensor 20. And detecting the outside air temperature from (S10).

Subsequently, the method calculates a fog generation index (FP) by receiving the detected current humidity and outside air temperature (S20).

Next, the defogging start time is determined based on the calculated value of the calculated fog occurrence index FP, and when the defogging start time is reached, the defogging means 40 is operated. )

In this case, the calculation function f for calculating the fog generation index FP is formed by reflecting the fog generation reference humidity set to vary according to the magnitude of the outside temperature.

As shown in FIG. 3, the fog generation reference humidity according to the present invention is set to a plurality of humidity values TH1 and TH2 having a predetermined interval to increase the accuracy of the fog generation index FP.

Here, the fog generation reference humidity (TH1) and the fog generation reference humidity (TH2) are the minimum boundary value and the maximum boundary value at which fog may be generated in the region to which the current humidity belongs, respectively.

More specifically, as shown in FIG. 3, the fog generation reference humidity (TH2) is 85% RH and the fog generation reference humidity (TH1) is 80% when the outside air temperature range is less than minus 5 ° C. It is preferable to set to RH.

In addition, when the outside air temperature range is below minus 5 ° C and the image is below 10 ° C, the fog generation reference humidity TH1 is set to 75% RH and the fog generation reference humidity TH2 is set to 80% RH. Do.

When the outside air temperature range is 10 ° C. or more, the fog generation reference humidity TH1 may be set to 80% RH, and the fog generation reference humidity TH2 may be set to 85% RH.

In addition, the fog generation reference humidity (TH1, TH2) according to the present invention is set so as to be the minimum value (75% RH, 80% RH), respectively, especially in the outside temperature range (0 ℃ ~ image 5 ℃) high fog generation possible desirable.

In addition, the fog generation reference humidity (TH1, TH2) according to the present invention is set so as to be the minimum value (75% RH, 80% RH), respectively, especially in the low outside temperature range (0 ℃ ~ image 5 ℃) possible fog generation, It is preferable that the minimum value (75% RH, 80% RH) be set to increase equally in left and right symmetry. That is, as shown in Figure 3 in the outside temperature range (0 ℃ ~ image 5 ℃) when the outside temperature is lowered from below 5 ℃ or less, or is changed to increase from above 10 ℃ above the minimum value It is set to increase equally symmetrically about the center. In addition, the fog generation reference humidity TH1 is set to increase to 80% RH equally, and the fog generation reference humidity TH2 is set to increase to 85% RH equally.

Therefore, in the present invention, it is preferable to obtain the arithmetic function f using the following Equation 1.

[Calculation Formula 1]

FP = f (WSH, Amb), f = a × FP_TH1 + b × FP_TH2 + c × (WSH-d) + Amb_Effect

Here, WSH is the current humidity of the window, Amb is the outside temperature, FP_TH1 is a value obtained by the difference between the current humidity and the fog generation reference humidity (TH1) of the region to which the current humidity belongs, and FP_TH2 is Each value is obtained by a difference from the fog generation reference humidity (TH2) in the region to which the current humidity belongs, and Amb_Effect is an ambient temperature gradient function calculated by reflecting the current humidity and the ambient temperature at this time.

And a, b, and c are weights determined according to vehicle driving conditions, and d is a constant. For example, a = 1 to 10, b = 5 to 20, c = 1 to 10, and d = 50 to 95 Is determined within.

In the present invention, it is preferable to obtain FP_TH1 and FP_TH2 using [Calculation Formula 2].

[Calculation 2]

FP_TH1 = max [(WSH-TH1), 0]

FP_TH2 = max [(WSH-TH2), 0]

Therefore, the arithmetic function f according to the present invention preferably sets the fog generation index FP to a value in which the window current humidity WSH exceeds the fog generation reference humidity TH1 and TH2. Do.

Here, FP_TH1 is a value obtained by a difference between the current humidity WSH and the fog generation reference humidity TH1 of the region to which the current humidity belongs at this time, and FP_TH1 = 0 when FP_TH1 = WSH-TH1 <0.

FP_TH2 is a value obtained by a difference between the current humidity WSH and the fog generation reference humidity TH2 of the region to which the current humidity belongs at this time. When FP_TH2 = WSH-TH2 <0, it is defined as FP_TH2 = 0.

At this time, the value obtained by the difference between the current humidity (WSH) and the maximum fog generation humidity (TH1) of the region to which the current humidity belongs at this time, when FP_TH1 = WSH-TH1 <0, the outdoor temperature gradient function (Amb_Effect) is 0 It is prescribed by.

In addition, the current humidity (WSH; unit% RH) of the window 60 is detected in the range of 5.0 to 95% RH. At this time, when the current humidity (WSH) is 95% RH, the fog occurrence probability is the maximum value. The calculation index and the fog generation prediction value are calculated to be the maximum value, for example, 255, in which case the defogging means 40 is operated.

Here, the size of the calculated fog occurrence index may be set to 0 to 255. In the present invention, for example, when the calculation value of the fog generation index, that is, the size of the fog generation prediction value is less than a predetermined cutoff value (for example, 8), It is determined that the fog occurrence probability is very low, and the determination is not made at the start of defogging (S30).

On the other hand, the present invention can be applied by further reflecting the information detected by the vehicle speed sensor 50, by further performing the step of detecting the vehicle speed of the vehicle from the vehicle speed sensor 50 (S10), the calculation function (f) As the vehicle speed increases, the fog generation index (FP) is set to increase proportionally. As such, the reason for reflecting the information of the vehicle speed in the present invention is that the surface 62 temperature of the window 60 is more likely to generate humidity under the influence of the driving wind air when the vehicle speed is higher than when the vehicle speed is low.

Here, it is preferable to use the thing of the range of 0KPH (Kilometer Per Hour)-150KPH (Kilometer Per Hour) as the application range of a vehicle speed.

Therefore, according to the present invention, it is preferable to obtain the calculation function f using the following calculation formula 3 when reflecting the vehicle speed.

[Calculation 3]

FP = f (WSH, Amb, F_speed) f = a × FP_TH1 + b × FP_TH2 + c × (WSH-d) + Amb_Effect + i × F_Speed

Here, F_Speed is the vehicle speed at the time of detection of the said current humidity. And i is a weight determined according to the vehicle driving conditions.

On the other hand, the present invention preferably calculates the outside temperature gradient function (Amb_Effect) applied to the above [calculation 1], [calculation 2], [calculation 3] using the following calculation formula 4.

[Calculation 4]

Amb_Effect = (e × F_Amb1 × WSH) + (f × F_Amb2 × FP_TH1)-g × F_Amb1

Here, F_Amb1 is the outside air temperature (Amb) from the minus 15 ℃ to the image 10 ℃, F_Amb2 = | F_Amb1-h |, e, f, g is a weight determined according to the vehicle driving conditions, h is As a constant, it is determined within the range of e = 0-1, f = 0-1, g = -20-20, h = 0-10, for example.

In addition, in the above [Calculation 4], when WSH-TH1 <0, the outdoor air temperature gradient function Amb_Effect = 0 limits the lower limit so that the window humidity WSH is smaller than the fog generation reference humidity TH1. If not, the fog generation index FP value due to the outside air temperature Amb is not calculated to be zero (0).

1 is a cross-sectional view showing an internal configuration of a vehicle air conditioner for explaining the defogging means applied to the present invention.

2 is a block diagram for implementing a defogging control method according to the present invention.

3 is a graph showing fog generation reference humidity (TH1, TH2) is set to vary according to the size of the outside temperature.

Figure 4 is a view installed sensors that are the main components of the present invention.

5 is a flowchart illustrating a defogging control method of the present invention.

<Description of the symbols for the main parts of the drawings>

10: humidity sensor 20: outside temperature sensor

30 control unit 40 defogging means

50: vehicle speed sensor 60: window

61: inside 62: outside

Claims (6)

Determining a defogging start time of the vehicle window to prevent fogging of the vehicle window; and determining a defogging start time and operating a defogging means when the defogging start time is reached. In the defogging control method of, Detecting a current humidity around an inner surface of the window from a humidity sensor installed in proximity to the window; Detecting the outside air temperature from the outside air temperature sensor; Calculating a fog generation index (FP) by receiving the detected current window humidity and outdoor temperature; Operating the defogging means by determining that the defogging start point has been reached when the calculated value of the calculated fog occurrence index FP exceeds a predetermined reference value, The calculation function f for calculating the fog generation index FP is made by reflecting a fog generation reference humidity set to vary according to the magnitude of the outside air temperature, The fog generation reference humidity (TH1, TH2) is set to a plurality of humidity values (TH1, TH2) having a predetermined interval, the defogging control method of the vehicle window, characterized in that to increase the accuracy of the fog generation index. The method of claim 1, Detecting a vehicle speed of the vehicle from the vehicle speed sensor; The operation function f is, Defogging control method of a vehicle window, characterized in that the fog generation index (FP) is set to increase proportionally as the vehicle speed increases. The method of claim 1, The fog generation reference humidity is a defogging control method of the vehicle window, characterized in that it is set to be the minimum value in the outside temperature range of the high possibility of fog generation. delete The method of claim 1, The fog generation reference humidity is a defogging control method of a vehicle window, characterized in that the outside air temperature range with low probability of fog generation is set to a minimum value, and is increased to be equally symmetrically around this minimum value. The method of claim 1, The operation function f is And a fog generation index is proportional to a value at which the window humidity exceeds the fog generation reference humidity.

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