KR20090073611A - Defogging device of air conditioning system for automotive vehicles - Google Patents

Abstract

A defogging device of a vehicle air-conditioning system is provided to prevent a compressor from excessively consuming power to thereby improve the fuel efficiency of a vehicle and reduce vehicle maintenance cost. A defogging device of a vehicle air-conditioning system includes a defog sensor(30) and a controller(56). The defog sensor senses the indoor humidity of a vehicle. The controller outputs a defogging mode signal when the indoor humidity sensed by the defog sensor is greater than compressor on reference humidity to driver a compressor(7) and gradually decreases capacity of the compressor in proportion to the indoor humidity when the indoor humidity decreases to compressor off reference humidity in a defogging mode.

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, by differentially controlling the capacity of the compressor according to the humidity of the window glass, it is possible to minimize the power consumption required for the operation of the compressor, and therefore, the vehicle It relates to a defogging device of a vehicle air conditioning system that can improve the fuel economy of.

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 (Defogging Device) to remove the mist of the window glass, if the mist occurs in the window glass of the vehicle.

As an example of a defogging device, there is Korean Patent Publication No. 2007-62728. This technique, as shown in Figure 1, the defogger sensor 1 for detecting the relative humidity (hereinafter referred to as "humidity of the window glass") of the inner surface of the window glass, and the input from the defog sensor 1 According to the humidity of the window glass (Def. Door) 3, the internal and external air switching door (5) and the controller (9) for controlling the compressor (7) and the blower (8).

In particular, the controller 9, as shown in Figs. 1 and 2, when the humidity of the window glass input from the defog sensor 1 is equal to or greater than the first reference humidity c, the "defogging mode" (Defogging Mode) The internal and external air conversion door 5 is switched to the external air mode ("A") while switching to), and at the same time, the deep door 3 is started to open.

When the humidity of the window glass input from the defog sensor 1 is equal to or greater than the second reference humidity d, the deep doors 3 are all opened (100%), and the compressor 7 is operated at maximum. , Blower 8 is turned ON.

Accordingly, as shown in FIG. 1, external fresh air is cooled / dehumidified while passing through the evaporator 10, and the cooled / dehumidified outdoor air is discharged to the window pane of the vehicle through the defrost vent 12. The discharged cold air can remove the mist of the window glass.

On the other hand, as shown in FIG. 2, when the humidity of the window glass input from the defog sensor 1 drops below the third reference humidity b, the controller 9 switches the blower 8 to " auto mode " Switch to Auto Mode and start closing the deep door (3) at the same time.

When the humidity of the window glass input from the defog sensor 1 falls back to the fourth reference humidity (a), the deep door 3, the outside air conversion door 5, and the compressor 7 are simultaneously moved to "auto mode". Switch.

Thus, the deep door 3 is completely closed, the internal / external air switching door 5 is switched to the betting mode ("B"), and the compressor 7 and the blower 8 are turned off. As a result, the defogging device stops working.

Here, it is common that the second reference humidity d built in the controller 9 is set to 80% relative humidity, and the fourth reference humidity a is set to 65% relative humidity. This is because when the humidity of the window glass is more than 80% relative humidity, the frost phenomenon occurs throughout the window glass, and the humidity of the window glass is less than 65% relative humidity, the frost phenomenon of the window glass is completely eliminated.

However, since the conventional defogging device has a structure in which the capacity of the compressor 7 is maximally operated when the humidity of the window glass is equal to or higher than the reference humidity d, the evaporator 10 is irrespective of the humidity of the window glass and the degree of mistiness. ), There is a disadvantage that excessive cold air is generated, and due to this disadvantage, there is a problem in that power consumption for driving the compressor 7 is excessively consumed.

In particular, since the power consumption of the compressor 7 is excessively consumed, the fuel economy of the vehicle is deteriorated, and as a result, the maintenance cost of the vehicle is raised.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its object is to variably control the capacity of the compressor in consideration of the humidity of the window glass in the defogging mode, thereby increasing the capacity of the compressor in the defogging mode. An object of the present invention is to provide a defogging device for an air conditioning system for a vehicle, which can restrict the maximum operation of the vehicle.

It is still another object of the present invention to provide a defogging device for an air conditioning system for a vehicle that can prevent power consumption of the compressor due to the maximum capacity by limiting the capacity of the compressor to operate unconditionally.

Still another object of the present invention is to provide a defogging apparatus for an air conditioning system for a vehicle, which can improve fuel efficiency of a vehicle by preventing the power consumption of the compressor, thereby reducing the maintenance cost of the vehicle.

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 mist of the window glass when the defogging mode signal is applied, the defogging for detecting the indoor humidity of the vehicle The sensor; When the interior humidity input from the defog sensor is greater than the compressor on reference humidity, the defogging mode signal is output to drive the compressor, and the interior humidity is turned off by performing the defogging mode. When it is reduced to the reference humidity, it characterized in that it comprises a control unit for controlling to gradually lower the capacity of the compressor in proportion to the size of the indoor humidity.

According to the defogging device of the air conditioning system for a vehicle according to the present invention, since the capacity of the compressor is variably controlled in accordance with the humidity of the window glass in the defogging mode, the capacity of the compressor is unconditionally limited to the maximum operation in the defogging mode. It can work.

In addition, since the capacity of the compressor is unconditionally limited to the maximum operation, there is an effect that can prevent the power consumption of the compressor due to the maximum capacity in advance.

In addition, since the excessive power consumption of the compressor is prevented, the fuel economy of the vehicle can be improved, and therefore, there is an effect that the maintenance cost of the vehicle can be reduced.

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. 3, the defogging device of the present invention includes a defog sensor 30.

The defog sensor 30, as a humidity sensor, detects indoor humidity, in particular, relative humidity of the inner surface of the window glass, and then inputs the detected humidity of the window glass to the controller 50. Here, the defog sensor 30 is installed on the inner surface of the window glass.

Referring again to FIG. 3, the defogging device of the present invention processes data input from the defog sensor 30 to process the deep door 3, the internal / external air switching door 5, the compressor 7, and the blower ( And a controller 50 for controlling 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 "compressor capacity value" for each window pane humidity.

When the humidity of the window glass is input from the defog sensor 30, the comparing unit 54 compares whether the humidity of the input window glass is equal to or higher than a preset humidity.

When the humidity of the window glass is equal to or higher than the reference humidity d, the controller 56 determines that the fog is started on the window glass of the vehicle, and outputs a "defogging mode signal". According to the output "defogging mode signal", the deep door 3, the internal and external air switching doors 5, the compressor 7 and the blower 8 are controlled.

In particular, the deep door 3 is opened, the internal / outer air switching door 5 is switched to the external air mode (“A”), and the compressor 7 and the blower 8 are turned ON.

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.

On the other hand, the control unit 56, when the interior humidity input from the defog sensor 30 in the process of operating the compressor (7) exceeds the compressor (7) On reference humidity (d), depot The memory unit 52 detects the "compressor capacitance value" corresponding to the "window humidity" input from the sensor 30. Based on the detected "compressor capacity value", the control of the compressor 7 is gradually raised.

In particular, by controlling the capacity of the compressor 7 to be gradually raised based on the detected "compressor capacity value", the compressor 7 is operated at a predetermined capacity to discharge refrigerant of a predetermined capacity. Therefore, the discharged refrigerant is to generate the cold air while passing through the evaporator 10, it is possible to generate the optimum cold air suitable for the humidity and the degree of fog of the window glass.

In addition, the control unit 56, when the interior humidity input from the defog sensor 30 in the process of operating the compressor 7 is reduced to the off reference humidity (a), the defog sensor 30 The memory unit 52 detects the "compressor capacitance value" corresponding to the "window humidity" inputted from). Based on the detected "compressor capacity value", the control of the compressor 7 is gradually lowered.

Here, the controller 56 controls the capacity of the compressor 7 according to the detected "compressor capacity value", but when the compressor 7 is a "variable capacitance type", the control unit 56 controls the inclination angle of the swash plate to control the compressor ( 7) to control the capacity. And when the compressor 7 is a "fixed capacitance type", the capacity of the compressor 7 is controlled by controlling the cut-off temperature of the compressor 7. When the compressor 7 is "electric", the capacity of the compressor 7 is controlled by controlling the rotational speed of the compressor 7.

For reference, the cut-off temperature of the fixed displacement compressor is a temperature for controlling a target temperature of the evaporator 10. When the cut-off temperature is controlled, the cold air of the evaporator 10 may be adjusted. In particular, when the temperature of the cutoff is raised, the off ratio of the compressor is increased to reduce the driving ratio of the compressor and to improve fuel economy.

In addition, the memory unit 52 includes various "compressor capacity values" different for each window glass, and these "compressor capacity values" for each window glass are based on test data obtained through a plurality of test results.

Preferably, the capacity of the compressor 7 is set to be proportional to the humidity of the window pane. For example, the higher the humidity of the window glass is, the higher the capacity of the compressor 7 is to supply more dehumidified cooling air.

Because, as the humidity of the window glass increases, the amount of mist generated in the window glass gradually increases, so that the mist of the window glass is more effectively removed by supplying dehumidified cooling air.

According to the present invention having such a configuration, since the capacity of the compressor 7 is differentially controlled in accordance with the humidity of the window glass in the "defogging mode", the capacity of the compressor 7 is unnecessary in the defogging mode. You can limit what works best.

In particular, as shown in FIG. 4, since the compressor 7 is turned on, the capacity of the compressor 7 is controlled to be variable (X) (Y) in proportion to the humidity of the window glass, so that the compressor 7 is turned on. After being turned on, energy as much as hatched portion B can be saved, compared to the prior art in which the capacity of the compressor 7 is operated at maximum unconditionally.

Therefore, unreasonable energy consumption can be prevented, and fuel economy of the vehicle can be improved by preventing unreasonable energy consumption. As a result, since the fuel economy of the vehicle can be improved, the maintenance cost of the vehicle can be reduced.

Next, a defogging device control method using the defogging device of the present invention having such a configuration will be described with reference to FIGS. 3 and 5.

First, as shown in FIG. 5, when the air conditioning system is turned on (S101), it is determined whether or not the humidity of the window glass input from the defog sensor 1 is equal to or higher than the set humidity (S103).

As a result of determination, if the set humidity is equal to or higher than the set humidity, the internal / external air switching door 5 is switched to the external air mode (“A”), the compressor 7 and the blower 8 are operated at the same time, and the deep door 3 is opened ( S105).

In this state, as shown in FIG. 3, external fresh air 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 is the window glass. Removes fog.

Meanwhile, as shown in FIG. 5, in the process of operating the compressor 7 (S105), the controller 56 stores the “compressor capacity value” corresponding to the “window humidity” input from the defog sensor 30. Detection is made at 52 (S107).

Then, the compressor 7 is controlled according to the detected "compressor capacity value" to operate the compressor 7 at the detected capacity (S109).

In this state, the compressor 7 operated at the detected capacity discharges the refrigerant having the detected capacity, thereby discharging the optimum refrigerant suitable for the humidity of the window glass. In addition, the refrigerant that discharges the optimal refrigerant passes through the evaporator 10 to generate optimal cold air suitable for the humidity 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 process in which a conventional defogging device is controlled according to the window glass humidity,

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

4 is a view showing a process in which the defogging device of the present invention is controlled according to the window glass humidity,

5 is a flowchart illustrating a method for controlling a defogging device using the defogging device according to the present invention.

♣ 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

30: Defog Sensor 50: Controller

52: memory unit 54: comparison unit

56: control unit

Claims (5)

In the defogging device of the air conditioning system for a vehicle to remove the fog of the window glass when the defogging mode signal is applied, A defog sensor 30 for detecting indoor humidity of the vehicle; When the interior humidity input from the defog sensor 30 is greater than the compressor 7 on reference humidity d, the defogging mode signal is output to drive the compressor 7, and the defogging mode is performed. When the interior humidity is reduced to the reference humidity (a) off the compressor (7) by the control unit 56 for controlling to gradually lower the capacity of the compressor (7) in proportion to the size of the indoor humidity Defogging device of a vehicle air conditioning system comprising a. The method of claim 1, The control unit 56, When the interior humidity input from the defog sensor 30 exceeds the compressor 7 on reference humidity d, the capacity of the compressor 7 is gradually increased in proportion to the size of the interior humidity. Defogging device for a vehicle air conditioning system, characterized in that the control to rise. The method according to claim 1 or 2, The control unit 56, Defogging device for a vehicle air conditioning system, characterized in that when the compressor (7) is a variable capacity type to control the capacity by changing the inclination angle of the swash plate. The method according to claim 1 or 2, The control unit 56, Defogging device for a vehicle air conditioning system, characterized in that when the compressor (7) is a fixed displacement type, the capacity is controlled by changing the cut-off temperature of the compressor (7). The method according to claim 1 or 2, The control unit 56, Defogging device for a vehicle air conditioning system, characterized in that for controlling the capacity by changing the rotation speed when the compressor (7) is an electric type.

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