KR20140084642A - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to an air conditioner for a vehicle. The purpose of the present invention is to provide an air conditioner which can automatically prevent air from flowing inside from the outside of a passenger compartment of the vehicle when the external air is polluted when the external air is drawn into the vehicle in order to prevent a driver from dozing, thereby preventing the inside of the vehicle from being polluted by polluted air and preventing the driver from dozing due to the polluted air. In order to achieve the purpose, the air conditioner for the vehicle includes: an intake door controlled in an internal air mode for drawing the internal air and an external air mode for drawing the external air; a blower for blowing the internal air and the external air into the vehicle by sucking the same; an evaporator for cooling air to be supplied into the vehicle; mode doors for controlling the discharge direction of the air discharged into the vehicle: a gas sensor for sensing concentration of carbon dioxide in the passenger compartment of the vehicle; and a control unit which controls the intake door to the external air mode by entering a drowsiness preventing mode when the concentration of the carbon dioxide in the vehicle inputted from the gas sensor exceeds a preset first reference concentration and controls the intake door to the internal air mode by entering an outside air blocking mode when the concentration of the carbon dioxide in the vehicle inputted from the gas sensor exceeds a second reference concentration which is higher than the first reference concentration.

Description

TECHNICAL FIELD [0001] The present invention relates to an air conditioning system for an automobile,

The present invention relates to a vehicle air conditioner, and more particularly, to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle, The present invention relates to a vehicle air conditioner capable of preventing air pollution in the passenger compartment due to contaminated outside air and thus causing the driver to be drowsy.

The interior of the car is narrow and tightly closed, and thus easily contaminated. In particular, carbon dioxide (CO ₂ ) generated by the respiration of passengers increases pollution in the interior of the car.

Car interior air polluted by carbon dioxide increases the driver 's fatigue and causes driver' s drowsiness. Especially, it induces driver's drowsiness, thereby increasing the risk of safety accidents.

In view of this, a device for preventing the driver from drowning when the air in the car is polluted by carbon dioxide is being developed.

1, the gas sensor 1 senses the concentration of carbon dioxide (CO ₂ ) in the interior of the car, processes the detected concentration of carbon dioxide in the control section 3 to obtain a reference concentration 3a, Quot; abnormality determination " and, as a result of the determination, it is equal to or greater than the "reference concentration 3a ", the air conditioner 5 is controlled to prevent the driver from drowning.

2, when the noxious gas concentration detected by the gas sensor 1 is equal to or higher than the "reference concentration ", the controller 3 enters the " sleepiness prevention mode" The door 5a is switched to the "outside air mode", the number of rotations of the blower 5b is increased, each mode door 5c is controlled to the vent mode, and the evaporator 5d of the air conditioner is turned on ).

Therefore, a large amount of outside fresh air is introduced, and then a large amount of the introduced outside air is cooled and directly supplied to the face portion of the driver. This reduces the concentration of carbon dioxide in the car interior and prevents the driver from drowning.

[0004] However, in this conventional technique, when the concentration of carbon dioxide in the outside air is higher than that in the car when the vehicle stagnates and lags or slows down, when the mode is switched to the "drowsy prevention mode ", a larger amount of carbon dioxide is introduced There is a problem that the air pollution in the car interior can be further deteriorated due to such a disadvantage.

In other words, when the vehicle stagnates and lags or slows down, the concentration of carbon dioxide outside the car may be higher than that of the car due to the exhaust gas of the vehicle. In this case, when the drowsiness prevention device is activated, There is a disadvantage that a larger amount of carbon dioxide flows into the passenger compartment together with outside air.

The drawback of this drawback is that there is a problem that the concentration of carbon dioxide in the car interior can be increased even more, and that the driver's fatigue and drowsiness may be further increased due to such a problem.

In view of this, there is a method of installing a separate outdoor gas sensor for sensing the concentration of carbon dioxide outside the car, and then limiting the introduction of outside air according to the concentration of carbon dioxide in the outside air detected from the gas sensor.

However, this method requires a gas sensor that detects the concentration of carbon dioxide in the outside air, so that it takes a further additional cost to provide the gas sensor. The disadvantage is that the manufacturing cost is increased due to such a disadvantage.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a vehicle air conditioner capable of blocking the introduction of outside air when the concentration of carbon dioxide outside the car is increased, .

Another object of the present invention is to provide an air conditioner which is capable of preventing the introduction of outside air when the concentration of carbon dioxide outside the car increases even in a state where the drowsiness prevention apparatus is operated, Thereby preventing air pollution and thus a driver's sleepiness.

It is a further object of the present invention to provide a vehicle air conditioner capable of determining whether or not the carbon dioxide concentration in the outside of the car is increased without a sensor for detecting the concentration of carbon dioxide outside the car, .

It is a further object of the present invention to provide an air conditioner that can control the introduction of outside air in the sleepiness prevention mode without the need of a sensor for detecting the concentration of carbon dioxide outside the car, And to provide a vehicle air conditioner in which the effect of cost reduction can be expected.

In order to achieve the above object, a vehicle air conditioning system according to the present invention comprises an intake door controlled by an indoor mode for introducing indoor air and an outdoor air mode for introducing outdoor air, a blower for sucking indoor air and outdoor air, An evaporator for cooling the air blown into the passenger compartment, and a mode door for controlling a discharge direction of the air discharged into the passenger compartment, comprising: a gas sensor for detecting the concentration of carbon dioxide in the passenger compartment; Wherein the control unit controls the intake door to the outside air mode while entering the drowsiness prevention mode when the carbon dioxide concentration of the interior of the vehicle inputted from the gas sensor is equal to or higher than a predetermined first reference concentration, And a controller for controlling the intake door to the inside mode while entering the outside air cutoff mode when the second reference concentration is higher than the second reference concentration.

Preferably, the control unit increases the number of revolutions of the blower, controls the mode doors to a vent mode, turns on the evaporator, turns on the outdoor air shutoff mode, , The blower, the mode doors and the evaporator are controlled to be in the same state as in the drowsiness prevention mode.

According to the air conditioning system for a vehicle according to the present invention, when the concentration of carbon dioxide in the interior of the vehicle continuously increases even in the "sleepiness prevention mode ", the introduction of outside air is blocked. It is possible to prevent the contamination of the interior of the vehicle and the drowsiness of the driver.

Further, it is possible to determine whether the carbon dioxide concentration in the outside of the car is increased through the increase of the carbon dioxide concentration in the car in the "drowsy prevention mode ", so that a separate gas sensor for detecting the carbon dioxide concentration outside the car is not necessary .

In addition, since a separate gas sensor for detecting the concentration of carbon dioxide outside the car is not required, the cost reduction effect can be expected.

1 is a view showing a conventional air conditioner for a vehicle,
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an air conditioner,
3 is a view showing a configuration of a vehicle air conditioner according to the present invention,
FIG. 4 is a graph showing an example of operation of the air conditioner according to the present invention, showing a mode of the air conditioner according to an increase in carbon dioxide concentration in the car,
5 is a flowchart showing an operation example of a vehicle air conditioner according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings (the same components as those in the prior art are denoted by the same reference numerals).

3 and 4, a vehicle air conditioning system according to the present invention includes a drowsiness prevention device for preventing drowsiness of the driver when the concentration of carbon dioxide in the interior of the vehicle is increased.

The drowsiness prevention device has a gas sensor 10, which detects the concentration of carbon dioxide contained in the air in the car.

The drowsiness prevention apparatus has a control unit (20). The control unit 20 is equipped with a microprocessor and has a preset "first reference concentration 22 ".

When the carbon dioxide concentration in the car interior is input from the gas sensor 10, the control unit 20 compares the input carbon dioxide concentration with the first reference concentration 22 or more.

As a result of the determination, when the temperature is equal to or higher than the "first reference concentration 22 ", the control unit 20 controls the air conditioning apparatus 5 while preventing the driver from drowsing while entering the " sleepiness prevention mode ".

Particularly, the intake door 5a of the air conditioner 5 is switched to the "outside air mode", the number of rotations of the blower 5b is increased, each mode door 5c is controlled to the vent mode, The evaporator 5d of the evaporator 5 is turned on.

Therefore, a large amount of fresh outside air is introduced, and a large amount of the introduced outside air is cooled and directly discharged to the face portion of the driver. This reduces the concentration of carbon dioxide in the car interior and prevents the driver from drowning.

On the other hand, the control unit 20 further has a preset "second reference concentration 24 ". The "second reference concentration 24" is set to a value higher than "the first reference concentration 22 ".

When the carbon dioxide concentration in the passenger compartment is continuously input from the gas sensor 10 in the state of entering the " drowsy prevention mode ", the control unit 20 controls the control unit 20 such that the input carbon dioxide concentration is " And judges the authorization again.

As a result of the determination, if the second reference concentration 24 is equal to or greater than the second reference concentration 24, the control unit 20 determines that the vehicle is currently stagnant, retarded, and slowly moving so that the concentration of carbon dioxide outside the vehicle is higher than that of the vehicle interior. It is judged that a large amount of carbon dioxide is contained.

According to this judgment, the intake door 5a of the air conditioner 5 is switched from the "outside air mode" to the "inside air mode" while entering the "outside air blocking mode". Therefore, the introduction of outside air is blocked.

As a result, introduction of outside air having a high carbon dioxide concentration is prevented. As a result, air pollution in the car interior due to carbon dioxide in the outside air is prevented.

On the other hand, when the blower 5b, the mode door 5c and the evaporator 5d are operated only in the "outside air mode", only the intake door 5a is switched from the "outside air mode" Is controlled in the same manner as in the "sleepiness prevention mode ".

Therefore, even in the case of the "outside air cutoff mode", the number of rotations of the blower 5b is high, each mode door 5c is controlled to the vent mode, and the evaporator 5d is operated. Thus, even in the case of the "outside air cutoff mode ", a large amount of cool air is supplied to the face portion of the driver to prevent the driver from drowning.

When the carbon dioxide concentration of the inside of the car inputted from the gas sensor 10 falls below the "second reference concentration 24" in the "outside air cutoff mode" state, the control unit 20 determines that the carbon dioxide concentration outside the car It is judged that it is lower than the indoor carbon dioxide concentration.

In accordance with this determination, it is determined that the air in the passenger compartment will not be contaminated even if the air outside the passenger compartment is introduced into the passenger compartment. According to this determination, the intake door 5a is changed from the " Return. This allows the introduction of outside air.

3, the air conditioner of the present invention further includes vehicle speed sensing means 30. [

The vehicle speed detecting means 30 is constituted by a vehicle speed sensor and senses the running speed of the vehicle and inputs it to the control unit 20. [

When the running speed of the vehicle is input from the vehicle speed detecting means 30 in the state of entering the "outside air cutoff mode", the control unit 20 determines whether the running speed of the inputted vehicle is equal to or greater than a preset "reference vehicle speed" . For example, 25 km / h or more.

As a result of the determination, if the vehicle speed is equal to or greater than the "reference vehicle speed ", it is determined that the vehicle speed is high and the carbon dioxide concentration outside the vehicle is low, Quot; outside air mode ". This allows the introduction of outside air.

Next, an operation example of the present invention having such a configuration will be described with reference to Figs. 3 to 5. Fig.

3 and 5, when the air conditioner 5 is turned on (S101), the control unit 20 determines that the carbon dioxide concentration of the car interior inputted from the gas sensor 10 is " 1 standard concentration 22 "or more (S103).

As a result of the determination, if the first reference concentration 22 is equal to or greater than the first reference concentration 22, the control unit 20 switches the intake door 5a of the air conditioner 5 to the "outside air mode" The number of revolutions of the blower 5b is increased to control each mode door 5c to the vent mode and turn on the evaporator 5d at step S107.

Then, a large amount of external fresh air is introduced, and the cooled outside air is directly supplied to the face portion of the driver. As a result, the concentration of carbon dioxide in the interior of the vehicle is reduced, thereby preventing the driver from drowning.

On the other hand, the control unit 20 determines again whether or not the carbon dioxide concentration of the inside of the car inputted from the gas sensor 10 is equal to or higher than the "second reference concentration 24" ).

As a result of the determination, if the second reference concentration 24 is equal to or greater than the second reference concentration 24, the control unit 20 determines that the concentration of carbon dioxide outside the car is higher than the car interior due to stagnation, (S111).

Then, the control unit 20 which has entered the "outside air cutoff mode" switches the intake door 5a of the air conditioner 5 from "outside air mode" to "inside air mode" (S113). Then, the inflow of carbon dioxide in the outside air is cut off, thereby preventing air pollution in the car interior due to carbon dioxide in the outside air.

On the other hand, when the control unit 20 enters the "outside air cutoff mode", the control unit 20 judges whether the carbon dioxide concentration in the car interior inputted from the gas sensor 10 has fallen below the "second reference concentration 24" It is again determined whether the vehicle speed inputted from the driver 30 is equal to or greater than the "reference vehicle speed" (S115).

As a result of the determination, if the vehicle is under the "second reference concentration 24" or the "reference vehicle speed" or more, it is determined that the concentration of carbon dioxide in the outside of the vehicle is lowered and the vehicle returns to the "drowsiness prevention mode" (S105).

After returning to the "sleepiness prevention mode", the control unit 20 returns the intake door 5a of the air conditioner 5 from the "bet mode" to the "outside mode" (S107). As a result, introduction of outside air is allowed, and as a result, fresh outside air is introduced into the interior of the vehicle, thereby preventing the driver from drowning.

On the other hand, if the carbon dioxide concentration in the passenger compartment input from the gas sensor 10 is not equal to or higher than the "second reference concentration 24" (S109-1) The control unit 20 determines again whether or not the carbon dioxide concentration in the car room inputted from the gas sensor 10 is equal to or greater than the first reference concentration 22 S103).

As a result of the determination, if it is equal to or greater than the first reference concentration 22, the air conditioner is controlled while maintaining the sleepiness prevention mode (S105) (S107).

On the other hand, if it is not more than the first reference concentration 22 (S103-1), that is, if it is less than the first reference concentration 22, the control flow goes to the original "automatic control mode" (S117). Therefore, the air conditioner 5 is automatically controlled in accordance with temperature conditions outside the car.

According to the present invention having such a structure, when the concentration of carbon dioxide in the interior of the vehicle is continuously increased even in the "sleepiness prevention mode ", the introduction of outside air is blocked. It is possible to prevent the contamination of the inside of the vehicle caused by the vehicle and thus the driver's drowsiness.

In addition, since the structure for increasing the carbon dioxide concentration outside the car can be determined by increasing the carbon dioxide concentration in the car in the "sleepiness prevention mode ", there is no need for a separate gas sensor for sensing the carbon dioxide concentration outside the car.

In addition, since a separate gas sensor for detecting the concentration of carbon dioxide outside the car is not required, the cost reduction effect can be expected.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

5: Air conditioner 5a: Intake door
5b: Blower 5c: Mode Door
5d: Evaporator 10: Gas sensor
20: control unit 22: first reference concentration
24: second reference concentration 30: vehicle speed sensing means

Claims (5)

An intake door 5a controlled in an outside air mode for introducing outside air, a blower 5b for sucking inside air and outside air to blow air into the passenger compartment, And an evaporator (5d) for cooling the air blown into the passenger compartment, characterized in that the mode door (5c)
A gas sensor 10 for sensing the concentration of carbon dioxide in the interior of the car;
When the concentration of carbon dioxide in the passenger compartment from the gas sensor 10 is equal to or greater than a predetermined first reference concentration, the intake door 5a is controlled to enter the drowsy prevention mode and the intake door 5a is controlled from the gas sensor 10 And a control unit (20) for controlling the intake door (5a) to the inside mode while entering the outside air cutoff mode when the input carbon dioxide concentration of the inside of the car is equal to or higher than a second reference concentration higher than the first reference concentration The air conditioner of the present invention. The method according to claim 1,
The control unit (30)
In the drowsy mode, the number of revolutions of the blower 5b is increased, the mode doors 5c are controlled to a vent mode, the evaporator 5d is turned on,
The blower 5b, the mode doors 5c and the evaporator 5d are controlled to be in the same state as in the drowsiness prevention mode in the outside air shutoff mode, while only the intake door 5a is controlled to the inside mode side Wherein the air conditioner comprises: 3. The method according to claim 1 or 2,
The control unit (30)
When the concentration of carbon dioxide in the car interior inputted from the gas sensor 10 drops below the first reference concentration in the drowsiness prevention mode, the air conditioning apparatus 5 is returned to its original state Wherein the air-conditioning control unit performs automatic control. The method of claim 3,
The control unit (30)
When the concentration of carbon dioxide in the interior of the vehicle, which is input from the gas sensor 10, is lower than the second reference concentration and the decreased concentration value is equal to or higher than the first reference concentration, And returning the intake door (5a) to the outside air mode side from the inside air mode while returning to the sleepiness prevention mode. The method of claim 3,
Further comprising vehicle speed sensing means (30) for sensing the running speed of the vehicle,
The control unit (30)
When the traveling speed of the vehicle inputted from the vehicle speed sensing means 30 is equal to or greater than a predetermined reference vehicle speed in the outside air cutoff mode, the intake door 5a is returned to the sleepiness prevention mode in the outside air cutoff mode, To the outside air mode side.

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