KR102563051B1 - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to an air conditioner for a vehicle, and in a low outdoor temperature condition, by controlling the "evaporator target temperature" downward in response to a low outdoor temperature, thereby limiting the operation of an air conditioner in a low outdoor temperature condition lower than the "evaporator target temperature", and the resulting depot It is possible to prevent the operation restriction of the ging device, and through this, when window fogging occurs in a low outdoor temperature condition lower than the "evaporator target temperature", the defogging device can control the window glass regardless of the "evaporator target temperature" and "outside air temperature". Its purpose is to enable rapid removal of fogging.
In order to achieve this object, the present invention provides an air conditioner for a vehicle that automatically controls an air conditioner according to a preset target temperature of an evaporator and removes fogging of a window by operating the air conditioner when fogging occurs on a window, wherein the outside air temperature is and a control unit that determines whether or not the outdoor temperature is a low outdoor temperature condition according to whether it is below a predetermined low outdoor temperature reference temperature, and controls the target temperature of the evaporator downward when the low outdoor temperature condition is determined as a result of the determination.

Description

Vehicle air conditioner {AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES}

The present invention relates to an air conditioner for a vehicle, and more particularly, to limit the operation of an air conditioner in a low outdoor temperature condition lower than the "evaporator target temperature" by downwardly controlling an "evaporator target temperature" in response to a low outdoor air temperature in a low outdoor temperature condition. And, it is possible to prevent the operation limitation of the defogging device due to this, and through this, when window fogging occurs in a low outdoor temperature condition lower than the "evaporator target temperature", the defogging device adjusts to the "evaporator target temperature" and "outside air temperature". The present invention relates to an air conditioner for a vehicle capable of promptly removing fogging of a window glass while actively responding to it regardless of limitations.

Recently, air conditioners for vehicles are being improved in an automatic control method.

An automatically controlled air conditioner (hereinafter, abbreviated as "air conditioner") sets "evaporator target temperature" according to indoor and outdoor temperature conditions and user-set temperature, and is automatically controlled according to the set "evaporator target temperature". Therefore, the temperature inside the vehicle is comfortably controlled according to the "user-set temperature".

On the other hand, such an air conditioner is equipped with an auto defogging device that automatically removes fogging of the window glass when fogging occurs on the window glass of the vehicle.

The auto defogging device detects the relative humidity on the window side (hereinafter, referred to as "window glass humidity"), and determines that fogging has occurred on the window portion when the detected window glass humidity is equal to or greater than a preset "reference humidity".

In addition, the air conditioner is controlled according to this judgment, and cold air is supplied to the window glass side. Therefore, the supplied cool air makes it possible to defog the window glass.

However, such a conventional air conditioner has a disadvantage in that it cannot respond to fogging on a window glass under a condition in which the air conditioner is not operated.

For example, in a low outdoor temperature condition, cases where the outdoor air temperature is lower than the "evaporator target temperature" often occur.

In particular, as shown in FIG. 1, the "evaporator target temperature" is set to 6 °C in the low outdoor temperature condition of 10 °C or less. The downside is that the air conditioner does not work even if fogging occurs.

And because of these disadvantages, there is a problem that the auto defogging device does not operate even though fogging occurs on the window glass, and because of this problem, there is a problem that the fogging generated on the window glass is not removed. As a result, it is pointed out that it is difficult to secure the driver's field of view and there are many concerns about safety accidents.

The present invention has been made to solve the above conventional problems, and its object is to variably control the "evaporator target temperature" to be lowered in response to the low outdoor temperature in the low outdoor temperature condition, so that the outdoor temperature in the low outdoor temperature condition An object of the present invention is to provide an air conditioner for vehicles capable of preventing lowering than the "target evaporator temperature" and, through this, restricting the operation of an air conditioner in a low outside temperature condition lower than the "target temperature of the evaporator".

Another object of the present invention is to prevent the limitation of operation of the defogging device in the low outdoor temperature condition lower than the "evaporator target temperature" by configuring to prevent the air conditioner operation restriction in the low outdoor temperature condition lower than the "evaporator target temperature". Through this, when window fogging occurs in a low-temperature condition lower than the "evaporator target temperature", the defogging device actively responds to providing an air conditioner for a vehicle that can quickly remove fogging of the window. there is.

Another object of the present invention is to actively respond to the occurrence of window fogging in a low outdoor temperature condition lower than the "evaporator target temperature" and to rapidly remove fogging of the window glass, thereby providing the "evaporator target temperature" and "outside temperature" It is an object of the present invention to provide an air conditioner for a vehicle capable of quickly securing a driver's field of vision by removing fogging of a window glass regardless of "degree".

In order to achieve these objects, an air conditioner for a vehicle according to the present invention automatically controls an air conditioner according to a preset target temperature of an evaporator, and operates the air conditioner when fogging occurs on a windowpane to remove fogging of a windowpane. characterized in that it includes a control unit that determines whether the outdoor temperature is a low outdoor temperature condition according to whether or not the outdoor temperature is equal to or less than a preset low outdoor temperature reference temperature, and controls the target temperature of the evaporator downward when the determination result is the low outdoor temperature condition. to be

Preferably, the control unit controls the evaporator target temperature downward under a low outdoor temperature condition, but variably controls the evaporator target temperature differently depending on the outdoor temperature.

The control unit may variably control the evaporator target temperature according to the outdoor temperature under the low outdoor temperature condition, but variably control the evaporator target temperature to maintain a state lower than the outdoor air temperature.

The control unit variably controls the evaporator target temperature according to the outdoor temperature under the low outdoor temperature condition, and the lower the outdoor temperature is from the low outdoor temperature reference temperature to the outdoor temperature within a specific range, the evaporator target temperature is proportional thereto. It is characterized in that the temperature is variably controlled in a linear manner, and the control is performed to fix the target temperature of the evaporator to a predetermined specific temperature from the outside temperature below the specific range.

The control unit may lower an air conditioner cut-off temperature to prevent icing of an air conditioner evaporator by a predetermined temperature in a low outdoor temperature condition.

According to the vehicle air conditioner according to the present invention, since the "evaporator target temperature" is controlled downward in response to the low outdoor temperature in a low outdoor temperature condition, it is possible to prevent the outdoor air temperature from being lowered than the "evaporator target temperature" in the low outdoor temperature condition. There are possible effects.

In addition, since it is possible to prevent the outdoor air temperature from being lowered than the “evaporator target temperature” in the low outdoor temperature condition, there is an effect of preventing air conditioner operation restrictions in the low outdoor temperature condition lower than the “evaporator target temperature”.

In addition, since it is a structure capable of preventing restrictions on the operation of the air conditioner in a low outdoor temperature condition lower than the "target temperature of the evaporator", it is possible to prevent restriction of the operation of the defogging device in a condition of a low outdoor temperature lower than the "target temperature of the evaporator", thereby, When fogging occurs on the window glass under a low outdoor temperature condition lower than the "evaporator target temperature", the defogging device actively responds and has the effect of rapidly removing the fogging of the window glass.

In addition, since it is possible to remove fogging of the window while actively responding to window fogging under the low outdoor temperature condition lower than the "evaporator target temperature", window fogging can be prevented regardless of the "evaporator target temperature" and "outside air temperature". It has the effect of quickly securing the driver's field of vision by removing it.

1 is a graph showing an example of the operation of a conventional vehicle air conditioner, a graph showing an example of the operation of a defogging device according to an evaporator target temperature and an outside temperature;
2 is a view showing the configuration of an air conditioner for a vehicle according to the present invention;
3 is a graph showing an operation example of an air conditioner for a vehicle according to the present invention, a graph showing an operation example of a defogging device according to an evaporator target temperature and an outside temperature;
4 is a graph showing another operation example of the vehicle air conditioner according to the present invention, a graph showing an operation example of the defogging device according to the evaporator target temperature and the outside temperature;
5 is a flowchart showing an example of operation of the vehicle air conditioner according to the present invention.

Hereinafter, a preferred embodiment of an air conditioner for a vehicle according to the present invention will be described in detail based on the accompanying drawings.

First, prior to examining the characteristics of the vehicle air conditioner according to the present invention, the automatically controlled air conditioner will be briefly reviewed with reference to FIG. 2 .

In an automatically controlled air conditioning system, “temperature conditions inside and outside the car” are input from the outside air sensor (1), in-car sensor (3), and solar sensor (5), and “user-set temperature” is input from the set temperature controller (7). Once inputted, the control unit 10 processes the input "temperature conditions inside and outside the vehicle" and "user set temperature" to set the optimal "target temperature", and the air conditioner 12 and the heater 14 according to the set "target temperature" ), the temp door 15, the intake door 17, and the mode door 19 are automatically controlled.

In particular, in the case of an air conditioner, the control unit 10 sets the "evaporator target temperature" according to the "temperature conditions inside and outside the vehicle" and the "user set temperature," and the compressor of the air conditioner (not shown) is set according to the "target temperature of the evaporator" set in this way. not) is automatically controlled. Therefore, the temperature inside the vehicle can be comfortably controlled according to the “user-set temperature”.

On the other hand, the air conditioner of the automatic control type is equipped with a defogging device 20 that automatically removes fogging of the window glass.

The defogging device 20 includes a defog sensor 22, determines whether the window glass humidity detected by the defog sensor 22 is greater than or equal to the "standard humidity", and as a result of the determination, determines whether the humidity is greater than or equal to the "standard humidity". In this case, the controller 10 recognizes that fogging has occurred on the window glass portion.

And according to this recognition, the controller 10 controls the air conditioner 12, the temp door 15, the intake door 17, and the mode door 19 of the defogging device 20 to supply cold air to the window glass side do. Therefore, the fogging generated on the window glass is removed.

Next, the characteristics of the vehicle air conditioner according to the present invention will be described in detail with reference to FIGS. 2 to 5 .

First, referring to FIG. 2 , the air conditioner of the present invention includes a control unit 10, wherein the control unit 10 determines that the current outdoor temperature is “low outdoor temperature condition” through the outdoor temperature input from the outdoor air sensor 1. “Evaluate cognition.

That is, it is determined whether the outside air temperature input from the outside air sensor 1 is “low outside air temperature reference temperature”, for example, 10° C. or less, and if the determination result is 10° C. or less, the control unit 10 determines that the current outside air temperature is It is determined that it is a "low temperature condition".

And when this determination is made, the control unit 10 enters the "evaporator target temperature variable mode 10a", and the control unit 10 that has entered the "evaporator target temperature variable mode 10a", shown in FIG. As such, the previously set “evaporator target temperature” is varied. In particular, it lowers the "evaporator target temperature" in response to the "low outdoor temperature condition" of 10°C or less.

Therefore, in the "low outdoor temperature condition", it is prevented in advance that the outdoor temperature is lower than the "evaporator target temperature". As a result, the operation of the air conditioner 12 is prevented from being restricted due to the outside air temperature being lower than the “evaporator target temperature”. In particular, it prevents the air conditioner 12 from not operating even though fogging occurs on the window glass.

As a result, despite the occurrence of fogging on the window glass, it is possible to prevent the limitation of operation of the defogging device due to the outside air temperature being lower than the “evaporator target temperature”.

Accordingly, when window fogging occurs in the "low outside temperature condition", the defogging device 20 can actively respond to and rapidly remove fogging of the window regardless of the "evaporator target temperature" and the "outside temperature". there is.

Accordingly, when fogging of the window glass occurs in the "low outside temperature condition", the driver's field of vision can be quickly secured regardless of the "evaporator target temperature" and the "outside temperature".

Meanwhile, the control unit 10 lowers the "target temperature of the evaporator" in the case of the "low outdoor temperature condition", but variably controls the "target temperature of the evaporator" differently depending on the outdoor temperature.

In particular, the control unit 10 varies the "evaporator target temperature" differently according to the outside air temperature under the "low outside air temperature condition", but the "evaporator target temperature" is lower than the outside air temperature input from the outside air sensor 1. Change the "evaporator target temperature" so that the condition can be maintained.

Preferably, the control unit 10 changes the "evaporator target temperature" according to the outside air temperature in the "low outside temperature condition", but as shown in FIG. From below the low outdoor temperature reference temperature to the outside air temperature in the specific range (A), for example, up to the outdoor air temperature in the range of 10 ℃ ~ 4 ℃, the lower the outdoor temperature, the "evaporator target temperature" is linearized in proportion to this. ) is set lower.

And from the outside air temperature below the specific range (A), control is performed to fix the “evaporator target temperature” to a preset specific temperature, for example, a temperature of 2 ° C.

On the other hand, the control unit 10 may vary the "evaporator target temperature" according to the outside air temperature in the "low outdoor temperature condition", but may also perform variable control in multiple stages according to a preset mapping value.

In particular, as shown in FIG. 4, from the "low outside temperature reference temperature" or less, which is the criterion for determining the "low outside temperature condition", to the outside temperature in a specific range (A), for example, the outside temperature in the range of 10 ° C to 4 ° C , the lower the outside air temperature, the "evaporator target temperature" may be variably controlled in multiple stages in proportion thereto.

Again, referring to FIGS. 2 and 3 , the control unit 10 controls the icing of the air conditioner evaporator (not shown) when entering the "evaporator target temperature variable mode 10a" according to the "low outdoor temperature condition". It is also configured to lower the air conditioner cut-off temperature to prevent icing.

In particular, it is configured to lower the air conditioner cutoff temperature by a preset temperature, for example, by 0.9°C. Typically, since the air conditioner cutoff temperature is set to 1.5°C, it is preferable to lower the air conditioner cutoff temperature from 1.5°C to 0.6°C when the "evaporator target temperature variable mode 10a" is entered.

In this way, the reason why the cutoff temperature of the air conditioner is lowered when the "evaporator target temperature variable mode 10a" is entered is because the "evaporator target temperature" is lowered when the "evaporator target temperature variable mode 10a" is entered, This is because when entering the "evaporator target temperature variable mode 10a", there is a possibility that the evaporator temperature of the air conditioner may become lower than the existing air conditioner cutoff temperature (1.5 ° C), and thus the air conditioner is frequently cut off.

Next, an operation example of the present invention having such a configuration will be described with reference to FIGS. 2 to 5 .

First, referring to FIGS. 5 and 2 , in a state in which the air conditioner is turned on (S101), the control unit 10 determines that the current outdoor temperature is “low outdoor temperature condition” through the outdoor temperature of the outdoor sensor 1. Whether or not it is determined (S103). The determination at this time is based on whether or not the outside air temperature of the outside air sensor 1 is "low outside temperature reference temperature", for example, 10°C or less.

And, as a result of the determination, if the “low ambient temperature reference temperature”, that is, 10° C. or less, the controller 10 recognizes that the current outdoor temperature is “low ambient temperature condition”, and based on this recognition, the “evaporator target temperature variable mode (10a) )" (S105).

And, as shown in FIG. 3, the control unit 10 that has entered the “evaporator target temperature variable mode 10a” lowers the previously set “evaporator target temperature” (S107). In particular, the “evaporator target temperature” is lowered according to the outside air temperature input from the outside air sensor 1 .

At this time, if the outside air temperature input from the outside air sensor 1 is within a specific range (A) below the "low outside temperature reference temperature", for example, within the range of 10 ° C to 4 ° C, the input outside temperature According to the value of the "evaporator target temperature" set in proportion to the degree, the "evaporator target temperature" is lowered.

And, when the outside air temperature input from the outside air sensor 1 is less than the specific range (A) (B), the “evaporator target temperature” is fixed downward to a preset specific temperature, for example, a temperature of 2°C.

In addition, the control unit 10 that has entered the “evaporator target temperature variable mode 10a” lowers the cutoff temperature of the air conditioner (S107).

On the other hand, in this state, since the "evaporator target temperature" is adjusted down, the outside air temperature does not become lower than the "evaporator target temperature".

Therefore, the operation restriction of the air conditioner 12 caused by the outside air temperature being lower than the “evaporator target temperature” is prevented. In particular, it prevents the air conditioner 12 from not operating even though fogging occurs on the window glass.

Accordingly, it is possible to prevent the operation of the defogging device from being restricted due to the outside air temperature being lower than the “evaporator target temperature” even though fogging occurs on the window glass.

As a result, when window fogging occurs in the "low outside temperature condition", the defogging device 20 can quickly remove the window fogging while actively responding regardless of the "evaporator target temperature" and "outside temperature". there will be

According to the air conditioner of the present invention having such a configuration, since the "evaporator target temperature" is downwardly controlled in response to the low outdoor air temperature in the low outdoor temperature condition, the outdoor air temperature is lower than the "evaporator target temperature" in the low outdoor temperature condition. can prevent

In addition, since it is possible to prevent the outside air temperature from being lowered than the “evaporator target temperature” in the low outdoor temperature condition, it is possible to prevent the air conditioner operation restriction in the low outdoor temperature condition lower than the “evaporator target temperature”.

In addition, since it is a structure capable of preventing restrictions on the operation of the air conditioner in a low outdoor temperature condition lower than the "target temperature of the evaporator", it is possible to prevent restriction of the operation of the defogging device in a condition of a low outdoor temperature lower than the "target temperature of the evaporator", thereby, When fogging occurs on the window glass in a low-temperature condition lower than the "evaporator target temperature", the defogging device can actively respond and quickly remove the fogging on the window glass.

In addition, since it is a structure that can remove fogging of the window while actively responding to window fogging under low outdoor temperature conditions lower than the "evaporator target temperature," By removing fogging, the driver's field of view can be quickly secured.

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

1: Outside air sensor (Sensor) 3: In-car sensor (In-car sensor)
5: Solar sensor 7: Set temperature controller
10: control unit 10a: evaporator target temperature variable mode (Mode)
12: Aircon 14: Heater
15: Temp. Door 17: Intake Door
19: mode door (Mode Door) 20: defogging device
22: defog sensor

Claims (7)

An air conditioner for a vehicle that automatically controls an air conditioner (12) according to a preset evaporator target temperature and removes fogging of a window by operating the air conditioner (12) when fogging occurs on a window,
and a control unit 10 that determines whether the outdoor temperature is a low outdoor temperature condition according to whether or not the outdoor air temperature is equal to or less than a preset low outdoor temperature reference temperature, and controls the evaporator target temperature downward when the determination result is the low outdoor temperature condition. A vehicle air conditioning system to be. According to claim 1,
The control unit 10,
The air conditioner for a vehicle, characterized in that, in a low outdoor temperature condition, the target temperature of the evaporator is downwardly controlled, but the target temperature of the evaporator is variably controlled differently depending on the outdoor temperature. According to claim 2,
The control unit 10,
An air conditioner for a vehicle, characterized in that in a low outdoor temperature condition, the evaporator target temperature is variably controlled according to the outdoor air temperature, but the evaporator target temperature is variably controlled to maintain a state lower than the outdoor air temperature. According to claim 2,
The control unit 10,
Under the low outdoor temperature condition, the evaporator target temperature is variably controlled according to the outdoor temperature, but the lower the outdoor temperature is from the low outdoor temperature reference temperature or less to the outdoor temperature within a specific range (A), the evaporator target temperature is increased in proportion thereto. It is controlled linearly and variablely,
An air conditioner for a vehicle, characterized in that the control is performed to fix the evaporator target temperature to a predetermined specific temperature from the outside air temperature below the specific range (A). According to claim 2,
The control unit 10,
Under the low outdoor temperature condition, the evaporator target temperature is variably controlled according to the outdoor temperature, but the lower the outdoor temperature is from the low outdoor temperature reference temperature or less to the outdoor temperature within a specific range (A), the evaporator target temperature is increased in proportion thereto. variable control in multiple stages,
An air conditioner for a vehicle, characterized in that the control is performed to fix the evaporator target temperature to a predetermined specific temperature from the outside air temperature below the specific range (A). According to any one of claims 1 to 5,
The control unit 10,
An air conditioner for a vehicle characterized in that it lowers the cut-off temperature of an air conditioner to prevent icing of an air conditioner evaporator by a predetermined temperature in a low outside temperature condition. According to claim 6,
The low outdoor temperature reference temperature, which is the criterion for determining the low outdoor temperature condition, is 10 ° C.
Under the low outdoor temperature condition, the outdoor temperature of the specific range (A) for variably controlling the target temperature of the evaporator is in the range of 10 ° C to 4 ° C,
The specific temperature for fixing the evaporator target temperature from the outside air temperature below the specific range (A) is 2 ° C,
In a low outside temperature condition, the air conditioner cut-off temperature is lowered by 0.9 ° C.

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