KR20090072613A - Defogging device of air conditioning system for automotive vehicles - Google Patents

Abstract

A defogging apparatus of an air conditioning system for vehicles is provided to cope with a variation in fogging condition of glass according to outdoor air temperature to secure the field of vision of a car driver all the time irrespective of the outdoor air temperature. A defogging apparatus of an air conditioning system for vehicles includes an outdoor air temperature sensor(20), an indoor humidity sensor(30), a memory(52), a comparator(54), and a controller(56). The outdoor air temperature sensor senses the outdoor air temperature of a vehicle. The indoor humidity sensor senses the indoor humidity of the vehicle. The memory stores information on defogging reference humidities by outdoor temperatures. The comparator detects a defogging reference humidity corresponding to the sensed outdoor air temperature from the memory and compares the defogging reference humidity with the sensed indoor humidity. The controller outputs a defogging signal when the indoor humidity is greater than the defogging reference humidity.

Description

DEFOGGING DEVICE OF AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES}

The present invention relates to a defogging device for a vehicle air conditioning system, and more particularly, to a vehicular air conditioning system that can effectively remove the mist of the window glass in response to the change in the conditions for generating the mist of the window glass due to the influence of the outside air temperature. It relates to a defogging device.

Recently, the vehicle air conditioning system has been improved by an automatic control method.

The automatic control air conditioning system detects the vehicle's outdoor air temperature and humidity, the vehicle's air temperature and humidity, and solar radiation, and then automatically adjusts the vehicle's indoor temperature and humidity according to the detected data. Therefore, the room temperature and humidity of the vehicle are always kept comfortable.

On the other hand, such an automatic control air conditioning system is provided with a defogging device for removing the mist of the window glass, if the mist occurs in the window glass of the vehicle.

Defogging device, as shown in Figure 1, the humidity sensor (1) for detecting the indoor humidity in the vicinity of the window glass, and according to the indoor humidity input from the humidity sensor (Def. Door) (3) And a controller 9 for controlling the internal / external air switching door 5, the compressor 7, and the blower 8.

Particularly, when the indoor humidity input from the humidity sensor 1 is equal to or higher than the set humidity, the controller 9 opens the deep door 3 while switching to the "defogging mode", and switches the internal and external air conversion doors ( 5) is switched to the outdoor mode position ("A"), and the compressor 7 and the blower 8 are operated.

Accordingly, the fresh air outside is cooled while passing through the evaporator 10, and the cooled outside air is discharged to the window glass of the vehicle through the defrost vent 12, and the discharged cold air can remove the mist of the window glass. To be able.

Here, the set humidity built into the controller 9 is usually set to 80% relative humidity. This is because, when the indoor humidity inside the window glass is 80% or higher relative humidity, fog occurs in the window glass.

However, such a conventional defogging device has a problem in that the operation is determined according to the indoor humidity, and thus, when the outside air temperature acts on the window glass and the mist generation condition of the window glass is changed, it cannot be coped with.

That is, the steaming of the window glass is generated depending on the indoor humidity near the window glass, but is greatly affected by the outside temperature at the time of occurrence. For example, in summer, the indoor humidity near the window glass should be at least 80% relative humidity to produce steaming on the window glass. However, in the spring and autumn months when the outside temperature is low, cold outside air affects the window glass. Even if the indoor humidity is less than 80% relative humidity, fog occurs on the window glass.

Therefore, the conventional defogging device, which is determined only by indoor humidity, has a problem in that, when the outside air temperature acts on the window glass and the mist generation condition is changed, it cannot cope with it properly. In the low spring and autumn seasons, it is impossible to effectively eliminate the mistiness that occurs on the window panes.

The present invention has been made to solve the conventional problems as described above, the object of the present invention, the air conditioning for the vehicle that can effectively remove the mist of the window glass in response to the change in the conditions for generating the mist of the window glass under the influence of the outside temperature It is to provide a defogging device of the system.

It is another object of the present invention to provide a defogging device for an air conditioning system for a vehicle that can ensure a driver's watch at all times clearly regardless of the outside temperature by responding to this even if the conditions of occurrence of misting of the window glass are changed according to the outside temperature. There is.

Defogging device of the vehicle air conditioning system of the present invention to achieve this object, in the defogging device of the vehicle air conditioning system for removing the fog of the window glass when the defogging mode signal is applied, to detect the outside air temperature of the vehicle Outside temperature sensing means; Indoor humidity detecting means for detecting indoor humidity of the vehicle; A memory unit for storing the defogging reference humidity indicating the indoor humidity of the vehicle at the time when the mist of the window glass occurs for each outside temperature; A comparator for detecting a defogging reference humidity corresponding to the outside air temperature sensed by the outside air temperature detecting means in the memory unit, and comparing the size with the indoor humidity detected by the indoor humidity detecting means; As a result of the comparison in the comparison unit, when the indoor humidity is greater than the defogging reference humidity, it is determined that the fog is started on the window glass of the vehicle, characterized in that it comprises a control unit for outputting a defogging mode signal.

According to the defogging device of the air conditioning system for a vehicle according to the present invention, since the entry point of the "defogging mode" is differentiated in consideration of the outdoor temperature and the indoor humidity of the vehicle, the conditions for generating the fog on the window glass are affected by the outside air temperature. Even if it responds properly, there is an effect that can effectively remove the mist of the window glass.

In addition, even if the steaming conditions of the windshield is changed according to the ambient temperature, the structure can cope with this, there is an effect that can ensure the driver's watch always clearly regardless of the outside temperature.

Best Mode for Carrying Out the Invention A preferred embodiment of a defogging device for a vehicle air conditioning system according to the present invention will be described in detail with reference to the accompanying drawings (the same components will be described using the same reference numerals).

First, referring to FIG. 2, the defogging device of the present invention includes an outside temperature sensing means 20 and an indoor humidity sensing means 30.

The outside air temperature sensing means 20 includes a temperature sensor 22 and detects the outside air temperature of the vehicle, and then inputs the detected outside air temperature data to the controller 50 to be described later.

The indoor humidity detecting means 30 is composed of a humidity sensor 32 and detects the indoor humidity of the vehicle, in particular, the indoor humidity near the window glass, and inputs the controller 50 to describe the indoor humidity near the detected window glass. Let's do it.

Here, the humidity sensor 32 is preferably installed on the most suitable position for detecting the indoor humidity of the inner surface of the window glass, for example, the inner surface of the window glass.

Referring back to FIG. 2, the defogging device of the present invention processes the data input from the outside air temperature detecting means 20 and the indoor humidity detecting means 30 to display the deep door 3 and the inside and outside air switching doors 5. ) And a controller (50) for controlling the compressor (7) and the blower (8).

The controller 50 includes a microprocessor and a driving circuit, and includes a memory 52, a comparator 54, and a controller 56.

The memory 52 has a built-in " defogging reference humidity " for each ambient temperature. "Defogging reference humidity" is an index indicating the indoor humidity of the vehicle according to the outside temperature with respect to the occurrence of steaming of the window glass, and is composed of humidity. "Defogging reference humidity" may be expressed as a proportional number with respect to 100 in consideration of humidity, humidity change rate, humidity accumulation tolerance, etc. in some cases.

When the outside temperature is input from the outside temperature sensing means 20, the comparing unit 54 detects the "defogging reference humidity" corresponding to the input outside temperature in the memory unit 52, and then detects the "defogging". Reference humidity "and the indoor humidity input from the indoor humidity detection means 30 is compared.

As a result of comparing the detected "defogging reference humidity" with the size of indoor humidity, the controller 56 judges that the fog window is started on the window glass of the vehicle when the indoor humidity is larger, and thus the deep door 3 and the outside air. The switching door 5, the compressor 7 and the blower 8 are controlled. In particular, the deep door 3 is opened while being switched to the "defogging mode" or the internal / external air switching door 5 is switched to the external air mode position "A", or the air conditioner, that is, the compressor 7 and the blower ( Turn ON 8).

Accordingly, the fresh air outside is cooled while passing through the evaporator 10, and the cooled outside air is discharged to the window glass of the vehicle through the defrost vent 12, and the discharged cold air can remove the mist of the window glass.

Here, the memory unit 52 includes various "defogging reference humidity" which are different for each outside temperature, and of course, the "defogging reference humidity" for each outside temperature is based on test data obtained through several test results. do.

For example, if the outside air temperature is below -5 ° C or above 10 ° C, the indoor humidity of the vehicle where steaming occurs in the window glass is 80% relative humidity, and the outside temperature is 0-5 ° C. Relative humidity of the generated vehicle is less than 70% relative humidity. At this time, relative humidity 80% corresponding to outside temperature -5 ℃, 10 ℃ and relative humidity 70% corresponding to outside temperature 0-5 ℃ are "defogging standard" Humidity "is built in.

Preferably, as shown in FIG. 5, when the outside temperature is a low temperature section requiring heating or a high temperature section requiring cooling, that is, -5 ° C. or lower or 10 ° C. or higher, “defogging reference humidity” is represented. It is preferable to be set to have a maximum value, and set to have a minimum value of "defogging reference humidity" at a temperature section between the cooling / heating sections, that is, 0 to 5 ° C.

This is because, in spring and autumn, when the cooling / heating is mixed, steaming of the window glass may occur even when the indoor humidity of the vehicle is low in spring and autumn. Therefore, the indoor humidity of the vehicle occurs during the spring and autumn. This is to remove the fog of the window pane more effectively.

According to the present invention having such a configuration, since the entry point of the "defogging mode" is differentiated in consideration of the outside air temperature and the indoor humidity of the vehicle, even if the conditions for generating fog on the window glass are affected by the outside air temperature, it is appropriately responded thereto. Therefore, the mist of window glass can be effectively removed.

In addition, even if the steaming conditions of the windshield is changed according to the ambient temperature, the structure can cope with this, there is an effect that can ensure the driver's watch always clearly regardless of the outside temperature.

Next, a method of controlling the defogging device using the defogging device of the present invention having such a configuration will be described with reference to FIGS. 2 and 3.

First, while the air conditioning system is turned on (S101), the outside air temperature and the indoor humidity are input from the outside air temperature detecting means 20 and the indoor humidity detecting means 30 (S103). Then, the "defogging reference humidity" corresponding to the input outside air temperature is detected by the memory unit 52 (S105).

When the detection of the "defogging reference humidity" is completed, the detected "defogging reference humidity" and the indoor humidity are compared by the comparing unit 54 to determine whether the indoor humidity is greater than the "defogging reference humidity" (S107). ).

As a result of the determination, if the indoor humidity is greater, the controller 56 determines that fog is generated on the window glass of the vehicle, and outputs a "defogging mode" signal (S109), and switches to the "defogging mode" according to the output signal. (S111).

In particular, while switching to the "defogging mode", the deep door 3 is opened, the internal / external air switching door 5 is switched to the external air mode position "A", and the compressor 7 and the blower 8 are operated.

Therefore, the fresh air outside is cooled while passing through the evaporator 10, and the cooled outside air is discharged to the window glass of the vehicle through the defrost vent 12, and the discharged cold air removes the mist of the window glass.

Next, FIG. 4 is a view showing another embodiment of the outside temperature sensing means 20 constituting the defogging device of the present invention.

The outside air temperature sensing means 20 of another embodiment includes the mode detecting sensor 24.

The mode detecting sensor 24 is a sensor for detecting a current mode state of the air conditioning system that changes according to the outside temperature, and serves to indirectly sense the outside temperature by detecting the current mode state.

That is, as shown in FIG. 5, the air conditioning system of the automatic control method is a vent mode or a bi-level mode in the summer season when the outside temperature is increased to a high temperature section requiring cooling, for example, 10 ° C. or more. In winter, when the air temperature is switched to (Bi-Level Mode) for a certain period of time, and the outside temperature is lowered to below 5 ° C, for example, when the outside temperature is heated, the floor mode is used for a certain period of time. Heats while switching, and cools / heats while mixing in floor mode, bi-level mode, and vent mode in the middle section between outside and high temperature section, eg, 0 ~ 5 ℃. do.

Therefore, when the current mode state of the air conditioning system is detected, it is possible to indirectly detect whether the temperature of the outside air is 10 ° C. or higher, or -5 ° C. or lower, or between 0 ° C. and 5 ° C.

For reference, the vent mode is a mode for discharging air passing through the evaporator 10 or the heater 14 in the direction of the face of the driver and the passenger. In addition, the bi-level mode is a mode for discharging air passing through the evaporator 10 or the heater 14 to the driver's and passenger's face and the floor surface of the room. The floor mode is a mode for discharging air passing through the evaporator 10 or the heater 14 to the floor surface of the room.

Referring again to FIG. 4, the outside air temperature sensing means 20 according to another embodiment further includes a conversion output unit 25.

The conversion output unit 25 includes a microprocessor and a driving circuit. The conversion output unit 25 converts a current mode state input from the mode detection sensor 24 into a corresponding ambient temperature and inputs it to the controller 50.

That is, when the mode input from the mode detection sensor 24 is maintained for a predetermined time in the vent mode or the bi-level mode, the outside air temperature is converted to a high temperature section, for example, 10 ° C., and the mode input from the mode detection sensor 24. Is maintained in the floor mode for a certain time, the outside temperature is converted to a low temperature section, for example, -5 ℃, the mode input from the mode sensor 24 is mixed with the floor mode, bi-level mode and vent mode On the other hand, the outside air temperature is converted into an intermediate section of the high / low temperature section, for example, between 0 and 5 ° C. Then, the converted outside temperature is input to the comparator 54 of the controller 50.

Here, of course, the conversion output unit 25 has a built-in outside air temperature corresponding to the current mode state. That is, 10 ° C corresponding to the operation of "vent mode and bi-level mode", -5 ° C corresponding to the operation of "floor mode", 0 to 5 corresponding to the operation of "floor mode and bi-level mode and vent mode". ° C is preset to the outside temperature.

According to the outside temperature sensing means 20 of another embodiment having such a configuration, since the structure to sense the outside temperature through the mode state of the air conditioning system, there is no need for a separate temperature sensor for sensing the outside temperature. Therefore, the number of parts can be reduced and the number of parts can be reduced, so that the effect of cost reduction can be expected.

Next, a method of controlling the defogging device having the outside temperature sensing means 20 according to another embodiment will be described with reference to FIGS. 4 and 6.

First, in a state in which the air conditioning system is turned on (S101), the current mode state and the indoor humidity are input from the mode detecting sensor 24 and the indoor humidity detecting means 30 (S103). At this time, the conversion output unit 25 outputs the converted outdoor temperature corresponding to the input current mode state.

On the other hand, if the outside temperature is output, the memory unit 52 detects the "defogging reference humidity" corresponding to the outside temperature (S105).

When the detection of the "defogging reference humidity" is completed, the detected "defogging reference humidity" and the indoor humidity are compared by the comparing unit 54 to determine whether the indoor humidity is greater than the "defogging reference humidity" (S107). ).

As a result of the determination, if the indoor humidity is greater, the controller 56 determines that fog is generated on the window glass of the vehicle, and outputs a "defogging mode" signal (S109), and switches to the "defogging mode" according to the output signal. (S111).

In particular, while switching to the "defogging mode", the deep door 3 is opened, the internal / external air switching door 5 is switched to the external air mode position "A", and the compressor 7 and the blower 8 are operated.

Therefore, the fresh air outside is cooled while passing through the evaporator 10, and the cooled outside air is discharged to the window glass of the vehicle through the defrost vent 12, and the discharged cold air removes the mist of the window glass.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

1 is a view showing a defogging device of a conventional vehicle air conditioning system,

2 is a view showing a defogging device of a vehicle air conditioning system according to the present invention;

3 is a flowchart illustrating a method for controlling a defogging device using the defogging device according to the present invention;

4 is a view showing another embodiment of the outside temperature sensing means constituting the defogging device of the present invention;

FIG. 5 is a graph illustrating a change in air temperature according to a mode temperature and a defogging control entry standard humidity change of an air temperature according to an outside temperature.

6 is a flowchart illustrating a method for controlling a defogging device according to another embodiment.

♣ Explanation of symbols for main part of drawing ♣

3: Deep Door 5: Inside and Outside Air Conversion Door

7: Compressor 8: Blower

10: evaporator 12: defrost vent

14: heater 20: outside temperature sensing means

22: temperature sensor 24: mode sensor

25: conversion output unit 30: indoor humidity detection means

32: humidity sensor 50: controller

52: memory unit 54: comparison unit

56: control unit

Claims (6)

In the defogging device of the vehicle air conditioning system is driven to remove the fog of the window glass when the defogging mode signal is applied, An outside air temperature sensing means 20 for sensing an outside air temperature of the vehicle; Indoor humidity detection means for detecting the indoor humidity of the vehicle (30); A memory unit 52 for storing the defogging reference humidity indicating the indoor humidity of the vehicle at the time when the mist of the window glass occurs for each outside temperature; The defogging reference humidity corresponding to the outside air temperature detected by the outside air temperature detecting means 20 is detected by the memory unit 52, and a comparison is performed in which the indoor humidity detected by the indoor humidity detecting means 30 is compared with the magnitude. Section 54; As a result of the comparison in the comparison unit 54, if the indoor humidity is greater than the defogging reference humidity, it is determined that the fog is started on the window glass of the vehicle comprising a control unit 56 for outputting a defogging mode signal; Defogging device for a vehicle air conditioning system, characterized in that. The method of claim 1, Defogging device for a vehicle air conditioning system, characterized in that when the control unit 56 outputs a defogging mode signal, the deep door (3) to open or switch to outside air mode or turn on the air conditioner. The method according to claim 1 or 2, The defogging reference humidity is Defogging of an air conditioning system for a vehicle, characterized in that the outside air temperature is set to have a maximum value in a low temperature section requiring heating or a high temperature section requiring cooling, and set to have a minimum value in a temperature section between the cooling section and the heating section. Device. The method of claim 3, wherein Defogging device for a vehicle air conditioning system, characterized in that the minimum temperature section of the defogging reference humidity is 0 ℃ to 5 ℃. The method of claim 1, The outside temperature sensing means 20, A mode detecting sensor 24 for detecting a current mode state of the air conditioning system that changes according to the outside air temperature; The external air temperature corresponding to the mode state of the air conditioning system is pre-built, and the conversion output unit converts the current mode state input from the mode detecting sensor 24 into the external air temperature corresponding thereto and inputs it to the comparison unit 54. Defogging device for a vehicle air conditioning system, characterized in that it comprises a (25). The method of claim 5, The conversion output unit 25, When the floor mode is maintained for a certain time, it is converted to the low temperature outside temperature section that requires heating. When the vent mode or the bi-level mode is maintained for a certain time, it converts to the high temperature outside temperature section that requires cooling. Defogging device for a vehicle air conditioning system, characterized in that for converting different modes for a certain time, converting the intermediate air temperature section located between the low temperature and high temperature.

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