KR20040099993A - Airconditioner system and its control method for elimination water vapor of window automatically in automobile - Google Patents

Abstract

PURPOSE: An air conditioner system and control method is provided to enable a driver to always secure a visual field and to safely drive a vehicle by repeatedly and automatically removing moisture from a window. CONSTITUTION: An air conditioner system for automatically removing moisture from a window is composed of an input unit(10), a control unit(20), and an output unit(30) driven by the control unit. The input unit outputs electric signals output from a temperature sensor(11) for detecting the temperature of a window surface and an indoor humidity sensor(12) for detecting the humidity in the inside of the vehicle. The control unit controls air condition selectively and by stages according to the difference between the temperature of the window surface and the dew point calculated from the humidity in the inside of the vehicle.

Description

Air conditioning system and its control method for elimination water vapor of window automatically in automobile}

The present invention relates to an air conditioning system for automatic dehumidification of a window of a vehicle, and a control method thereof, and more particularly, to install a window surface temperature sensor and an indoor humidity sensor on an inner surface of a window of a vehicle, and to a signal transmitted from the sensors. According to the moisture elimination logic, the air conditioning system can be selectively driven to automatically dehumidify, allowing the driver to pay attention only to driving while driving. An air conditioning system for removing moisture and a control method thereof.

In general, the air conditioning system that creates a comfortable environment for passengers including the driver even under various weather conditions and driving conditions, and at the same time to secure the driver's watch by removing the cloudy and frost of the window is a ventilation system, air-conditioning system and the air-conditioning system It is known that it is composed of a defroster and the like contained in.

Among them, the ventilation device adopts a natural ventilation method for introducing and discharging outside air into the cabin or a forced ventilation method using a blower due to a difference in wind pressure generated while driving the vehicle, and the forced heating method is adopted for the air-conditioning device.

In the forced ventilation system, a suction port for drawing outside air and a duct for discharging the outside air into a vehicle are installed in the same manner as the natural ventilation system, and the methods are commonly used.

In this way, the air flowing into the cabin is considered to flow along the window from the discharge port to prevent the wind from rising upward or the cold wind upwards, and to control the opening and closing of the duct according to the user's choice. To control the flow of air.

The control of the duct is controlled by a switch located in the instrument panel, the switch controls the operation of each component constituting the air conditioning system, the blower switch controls the operation and strength of the blower motor, the mode switch is the wind direction To control or eliminate the blurring of the window, the air conditioning switch controls the air conditioning unit to control the temperature in the cabin.

Here, the mode switch controls the wind direction in the displayed direction by controlling the opening and closing of the mode door.

In other words, the outlet of the air conditioning system is located at the front of the instrument panel and the rear and at the bottom of the front window and the side window, and each outlet is connected to each duct, and the mode door flows into the duct. To control.

Here, the discharge openings at the bottom of the front window and the side window are for removing cloudy or frost of the window and are called defrosters.

The defroster includes a hot air defroster using the above-described air conditioning system and an electrothermal defroster using the heat of resistance of the heating wire, and the use of the air conditioning system is called a hot air type, which mainly condenses moisture or frost on the inner surface of the window. This is a phenomenon that occurs during cold weather because it uses the warm air of the heating device, but is not necessarily limited thereto.

That is, even if the temperature is not cold in a humid climate such as the rainy season, moisture is easily condensed on the inner surface of the window, and in this case, the user removes the condensed moisture by using a cooling device, so that only the hot air defroster uses the heating device. It is not limited.

As described above, the defroster operates the blower switch to operate the blower motor, operates the defroster switch to open and close the mode door of the window duct, and controls the air-conditioning switch to allow the user to use hot air or cold air. You can remove moisture from the window by selecting.

As described above, the vehicle is equipped with an air conditioning system to create a comfortable environment in the cabin, and the air conditioning system includes a moisture removing device called a defroster to remove moisture and frost of the window due to climate change. It secures the driver's watch.

An air conditioning system that improves such a moisture removing device is proposed in Korean Laid-Open Patent Publication No. 03-321083, which describes the opening and closing of an auxiliary door in a duct connecting between a heater core and a vent hole in a vehicle interior. Auxiliary blowers are installed on the outside of the auxiliary door, and the auxiliary blower blows outside air to the heater core while the auxiliary door is open, and the outside air sucked by the heating coolant flowing through the heater core is heated, The moisture contained in the evaporator located is dried to remove it.

However, such a defroster has a problem causing inconvenience to the user due to manual operation of the switch.

That is, in order to operate the defroster, three switch operations are required, such as operating a blower motor, operating one of the air conditioners, and operating a mode door as described above.

Therefore, such a switch operation causes inconvenience to the user, and when such a switch operation is necessary during driving, there is a problem that itself interferes with safe driving along with aggregation of moisture.

Therefore, an air conditioning system for automatically removing moisture by improving such a problem is proposed in Korean Patent Publications Nos. 98-13275 and 97-12513, and the Patent Publication Nos. 98-13275 refer to a reference temperature. A control unit is provided to control the operation of the air conditioning system by setting the reference humidity, and an input of an outdoor air temperature sensor, an indoor temperature sensor, and a humidity sensor is connected to each of the input terminals, and a blower motor, an air conditioner, a heating device, and It is an air conditioning system with each defroster connected.

In addition, Korean Patent Laid-Open Publication No. 97-12513 discloses an indoor temperature sensor for detecting a temperature inside a vehicle, an outdoor temperature sensor for detecting a temperature inside the vehicle, and an opening and closing of each damper to adjust a direction in which air-conditioned air is ejected. The control unit outputs a control signal to the air direction mode selection unit according to an air direction mode selection unit and an air direction selection switch An air conditioner controller is configured to output a control signal to operate the air direction mode selector to a dehumidifying position for a predetermined time regardless of a state input from an external temperature sensor. As a system, such a conventional air conditioning system is to remove moisture by applying a constant reference temperature and reference humidity regardless of the temperature and humidity range, there is a problem that can not achieve an appropriate dehumidification effect, freezing Alternatively, the development of an air conditioning system that is not only controllable in steps according to aggregated moisture generation amount but also controllable repeatedly is required.

Therefore, the present invention has been invented to solve the above problems, by operating the air conditioner and the heating device in accordance with the changing climate to automatically remove the moisture agglomerated in the window or to prevent the automatic creation of the window It is an object of the present invention to provide an air conditioning system for removing moisture and a control method thereof.

In order to achieve the above object, the present invention provides a window surface temperature sensor and an indoor humidity sensor on a window inner surface of an automobile, and connects it to an air conditioning control device so that the air conditioning control device sends out signals from the sensors, and the transmission. It is possible to select and control the blower, air conditioner, mode door, and outdoor and outdoor doors automatically and step by step by comparing and determining the reference values set in stages according to the signal. You can take care and contribute to safe driving.

1 is a block diagram showing an air conditioning system for automatic window dehumidification of the vehicle according to the present invention,

2 is a block diagram showing a control process of the air conditioning system for automatic window dehumidification of a vehicle according to the present invention;

Figure 3 is a flow chart illustrating a control method of the air conditioning system for automatic window dehumidification of a vehicle according to the present invention.

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

10 input unit 11 window surface temperature sensor

12: indoor humidity sensor 20: control unit

30: output unit

Hereinafter, the features of the present invention for achieving the above object are as follows.

In the vehicle air conditioning system according to the present invention,

An input unit 10 for outputting an electrical signal of a window surface temperature sensor 11 for detecting a temperature of a vehicle window surface and an indoor humidity sensor 12 for detecting indoor humidity, and the window surface temperature sensor 11 A control unit 20 which is an air conditioning control device set in the form of logic so as to be selectively and stepwise controlled according to the range of difference (-) between the window surface temperature value and the dew point temperature value calculated from the indoor humidity sensor 12; And an output unit 30 which is a selection mode of the air conditioning system which can be driven by the control unit 20.

In controlling the air conditioning system of the vehicle according to the present invention,

Detecting the window surface temperature and the indoor humidity using the window surface temperature sensor 11 and the indoor humidity sensor 12;

Deriving the dew point temperature from the indoor humidity value, deriving the MP value which is the difference between the window surface temperature and the dew point temperature, and comparing the range of the MP value with the set value for operating the air conditioning system, selectively driving the selection mode of the air conditioning system. Characterized in that it comprises a step of removing moisture.

In particular, if the MP value is greater than 0.0 to 2.0, the first step of driving the FATC mode,

If the MP value is greater than -1.0 to 0.0, and less than or equal to 0.0 to 2.0, the second step of introducing the outside air by operating the internal and external air door, and the air is discharged through the duct with the air volume of the blower as one stage; ,

If the MP value is greater than -2.0 to -1.0 and less than or equal to -1.0 to 0.0, the outdoor air door is operated to introduce outside air, the air volume of the blower is set to two stages, and the mode door is operated to defrost the air. A third step to discharge the;

When the MP value is less than or equal to -2.0 to -1.0, the outdoor air door is operated to introduce external air and the air conditioner is operated to discharge cold air, and the air volume of the blower is set in three stages, and the mode door is operated. And a fourth step of discharging air to the defroster.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail.

1 is a block diagram showing an air conditioning system for automatic window dehumidification of the vehicle according to the present invention, Figure 2 is a block diagram showing a control process of the air conditioning system for automatic window dehumidification of the vehicle according to the present invention.

As shown in FIG. 1, the moisture removal logic of the control unit 20 according to the signal transmitted from the window surface temperature sensor 11 and the indoor humidity sensor 12 installed on the window inner surface of the vehicle is shown. By selectively and step by step to operate the air conditioning system to automatically perform the dehumidification.

Here, the moisture removal logic of the control unit 20 for controlling the operation of the air conditioning system is added to the logic of the Full Automatic Temperature Control (FATC) currently in use, moisture is frozen on the surface of the car window Or coagulation is the control logic to control the removal.

This is a natural phenomenon that moisture is generated when the window surface temperature is lower than the dew point temperature. The MP value is defined through the window surface temperature and the dew point temperature derived from the window surface temperature sensor 11 and the indoor humidity sensor 12, respectively. The air conditioning system is appropriately driven in accordance with the MP value, that is, the condition data value.

That is, the MP value is defined as a difference value between the window surface temperature and the dew point temperature. If the window surface temperature is higher than the dew point temperature, the MP value is detected as a + value and moisture is hardly generated, and the window surface temperature is a dew point temperature. If it is lower than the MP value is detected as a-value is easy to generate moisture, the air conditioning control device of the control unit 20 to determine whether this moisture generation.

Here, the dew point temperature by the window surface temperature sensor 11 and the indoor humidity sensor 12 can be obtained by the following equation.

First, when t <0 ° C,

ego,

When 0 ℃ <t <95 ℃

to be.

here,

P _w = current water vapor pressure, kPa = ΦP _ws

Φ = relative humidity,% RH

P _ws = saturated steam pressure,

to be.

The dew point temperature obtained by the above formula is an important factor to determine the moisture generation together with the window surface temperature.

Next, when the temperature and relative humidity are derived, the dew point temperature is calculated using the above calculation formula.

First, the temperature t is 15 ° C., the relative humidity is 70%, that is, φ = 0.7, and T is the absolute temperature, P = 101.325, C ₈ = -5.8002206E + 03; C ₉ = 1.3914993 E + 00; C ₁₀ = -4.8640239E-02; C ₁₁ = 4.1764768E-05; C ₁₂ = -1.4452093E-08; C ₁₃ = 6.5459673E + 00.

The formula for the above constant is as follows.

Saturated Steam Pressure

= exp (-5800.2206 / 288.15 + 1.3914993 + -0.048640239 × 288.15 + 4.1764768e-005 × 288.15 ² + -1.4452093e-008 × 288.15 ³ )) + 6.5459673e × log (288.15)) / 1000

= 1.7054477944415

Next, when the current steam pressure P _w is calculated by the saturated steam pressure P _ws , P _w = Φ P _ws , and thus the value is 0.7 × 1.7054477944415 = 1.1938134561091.

Α value becomes ln (1.1938134561091) = 0.17715276835002.

The dew point temperature value is calculated according to the above calculation value as follows.

= 6.54 + 14.526 × 0.177152768 + 0.7389 × 0.177152768 ² + 0.09486 × 0.177152768 ³ + 0.4569 × 1.193813 ^0.1984

= 9.6102817305403

Therefore, when the temperature is 15 ° C and the relative humidity is 70%, the dew point temperature is 9.6 ° C.

Therefore, the air conditioning system is driven by setting the moisture removal logic to the control unit 20 according to the MP value, which is the difference between the window surface temperature and the dew point temperature derived by the calculation formula. The control of the present invention having such a control unit 20 is performed. Looking at the process as shown in FIG.

Here, when described with reference to the accompanying drawings, the input unit 10 for sensing the window surface temperature and room humidity of the vehicle and outputs an electrical signal corresponding thereto, and the optimum driving state according to the signal output from the input unit 10 And a control unit 20, which is an air conditioning control device for controlling moisture removal of the vehicle window by performing a control function for controlling the controller and storing the data, and adding a moisture removal logic to FATC logic. The control unit 20 is configured to include an output unit 30 for removing moisture by driving an air conditioning system such as a mode door, internal and external doors, a blower, and a heating and cooling device.

On the other hand, Figure 3 is a flow chart showing a control method of the air conditioning system for automatic window automatic dehumidification of the vehicle according to the present invention, with reference to this, the output unit 30 that is selectively and stepwise controlled in accordance with the MP value of the air conditioning system The dehumidification logic for driving the selection mode will be described.

Here, the MP value, that is, the difference between the window surface temperature value and the dew point temperature value is set in stages to distinguish it, where a represents a range of 0.0 to 2.0, b represents a range of -1.0 to 0.0, and c is The range is -2.0 to -1.0.

At this time, if the MP value is greater than a, the air conditioning system, which is an indoor temperature maintaining device mounted on the existing vehicle, is operated by the existing FATC logic, and when the MP value is greater than b and less than or equal to a, the air conditioning system by the FATC logic is operated. The air conditioning system is operated by the moisture removal logic, and the outside air is operated by operating the inside and outside air doors, and the air is discharged through the duct by using the air flow of the blower as the first stage to remove moisture from the window surface. Do it.

In addition, if the MP value is greater than c and less than or equal to b, this control logic also operates the air conditioning system by the moisture elimination logic. The outside air is operated by operating the inside and outside air doors. By operating the door, air is discharged to the defroster, which also removes moisture from the window surface.

If the MP value is less than or equal to c, the indoor and outdoor air doors are operated to introduce external air and at the same time, the air conditioner is operated to discharge cold air, and the air volume of the blower is set to three stages. To be discharged.

After that, if the moisture is removed step by step it is to repeat the above steps.

As described above, when the MP value is measured as a-value due to a high dew point temperature step by step, and then a-value gradually increases, the moisture removal logic also increases the number of selection modes step by step to efficiently remove moisture. To help.

Therefore, bar moisture is efficiently removed by the control logic as described above, the control method of the air conditioning system for automatic window automatic moisture removal according to the present invention will be described in detail through a flow chart.

First, the air conditioning control device 20 of the control unit 20 measures the window surface temperature and the indoor humidity using the window surface temperature sensor 11 and the indoor humidity sensor 12.

And, by substituting the indoor humidity in the calculation formula to obtain the dew point temperature from the indoor humidity value, to derive the MP value, which is the difference between the window surface temperature and the dew point temperature to selectively operate the air conditioning system according to the range of the MP value, Driven by the dehumidification logic as described above.

We will omit it here to avoid repetition.

In this way, the present invention can be selected and controlled step by step by the moisture removal logic according to the signal transmitted from the window surface temperature sensor and the indoor humidity sensor, as well as repeatedly operating the air conditioning system to efficiently remove moisture This is a new air conditioning system and control method that can contribute to safe driving because the driver can pay attention only to driving by preventing the windows from agglomerating or freezing automatically without the driver's manual operation. .

As described above, according to the air conditioning system and the control method for the automatic window automatic dehumidification of the vehicle according to the present invention, it is possible to automatically remove the moisture, and furthermore it is possible to selectively control the step by step, as well as repeatedly dehumidification It is possible that the driver can always secure the field of vision has the effect that can contribute to safe driving.

Claims (3)

In the car air conditioning system, An input unit 10 for outputting an electrical signal of a window surface temperature sensor 11 for detecting a temperature of a vehicle window surface and an indoor humidity sensor 12 for detecting indoor humidity, and the window surface temperature sensor 11 A control unit 20 which is an air conditioning control device set in the form of logic so as to be selectively and stepwise controlled according to the range of difference (-) between the window surface temperature value and the dew point temperature value calculated from the indoor humidity sensor 12; And an output unit (30) which is a selection mode of the air conditioning system which can be driven by the controller (20). In controlling the vehicle air conditioning system, Detecting the window surface temperature and the indoor humidity using the window surface temperature sensor 11 and the indoor humidity sensor 12; Deriving the dew point temperature from the indoor humidity value, deriving the MP value which is the difference between the window surface temperature and the dew point temperature, and comparing the range of the MP value with the set value for operating the air conditioning system, selectively driving the selection mode of the air conditioning system. Method of controlling the air conditioning system for automatic window dehumidification of a vehicle, characterized in that it comprises a step of removing moisture. The method of claim 2, further comprising: driving the FATC mode if the MP value is greater than 0.0 to 2.0; If the MP value is greater than -1.0 to 0.0, and less than or equal to 0.0 to 2.0, the second step of introducing the outside air by operating the internal and external air door, and the air is discharged through the duct with the air volume of the blower as one stage; , If the MP value is greater than -2.0 to -1.0 and less than or equal to -1.0 to 0.0, the outdoor air door is operated to introduce outside air, the air volume of the blower is set to two stages, and the mode door is operated to defrost the air. A third step to discharge the; When the MP value is less than or equal to -2.0 to -1.0, the outdoor air door is operated to introduce external air and the air conditioner is operated to discharge cold air, and the air volume of the blower is set in three stages, and the mode door is operated. And a fourth step of discharging air to the defroster.