KR20200021158A - Air conditioner for vehicle and method for controlling the same - Google Patents

Abstract

Disclosed are an air conditioner for a vehicle and a control method thereof, wherein target temperature and cut-off temperature of an evaporator can be variably changed and controlled in accordance with a blower stage until an air filter is replaced when it is determined that air conditioning usage time is equal to or greater than filter replacement time by comparing the air conditioning usage time to the filter replacement time. Accordingly, an icing phenomenon of the evaporator which can be generated by dust accumulation on the air filter can be improved.

Description

Vehicle air conditioning system and control method thereof {AIR CONDITIONER FOR VEHICLE AND METHOD FOR CONTROLLING THE SAME}

The present invention relates to a vehicle air conditioner, and more particularly, to a vehicle air conditioner and a control method thereof that can improve the icing phenomenon of the evaporator that may occur due to dust accumulation on the air filter.

In general, a vehicle air conditioner is a device that cools or heats a vehicle interior by introducing indoor / outdoor air of a vehicle and heating or cooling the air to blow into the interior of the vehicle.

1 is a schematic view showing an air conditioner equipped with a general air filter.

As shown in FIG. 1, the vehicle air conditioner includes an internal and external air conversion door 11 installed therein to selectively open and close the internal and external air inlets formed at the inlet side according to the internal and external air modes. The blower unit 12 is installed to drive the blower 12 by the motor 13 so that the air sucked through the inlet 11 can be blown to the air conditioning case, and a predetermined interval is provided inside the air conditioning case 15. An evaporator 18 and a heater core 22 to be installed, and a temperature control door 20 installed between the evaporator 18 and the heater core 22 to adjust the amount of air passing through the heater core 22; And a mode door 24 formed at an outlet side of the air conditioning case 15 to open and close a plurality of vents 26 communicating with the vehicle interior, and an air filter 14 installed upstream of the blower 12. Is made of.

Therefore, when the user operates the predetermined operation unit 30 to control the air conditioning apparatus, the control unit 28 adjusts the positions of the internal and external air conversion doors 10 to select the internal and external air modes, By controlling the motor of the blower to adjust the air volume, or adjust the position of the temperature control door 20 and the mode door 24 or to perform the temperature and various air conditioning modes.

That is, in the betting mode, the internal and external air conversion doors 11 open the internal air inlet, and the external air inlet is sealed. At this time, the bet introduced through the internal air inlet by the operation of the blower 12 opens the air filter 14. After passing through and ventilated into the air conditioning case 15, the temperature control door 20 and the mode door 24 are selectively guided to each vent 26 while passing through the heater core 22. It is discharged to the room.

In addition, in the external air mode, the internal and external air conversion door 11 seals the internal air inlet and the external air inlet is opened. At this time, the air introduced through the external air inlet by the operation of the blower 12 is an air filter 14. After passing through the ventilating case 15 is blown into the interior of the air conditioning case 15, and guided through the heater core 22 selectively by the temperature control door 20 and the mode door 24 to each vent 26 And discharged into the vehicle interior.

However, the air filter 14 installed in the air conditioner filters dust in the air to purify the air flowing through the internal and external air inlets 11, and when used for a long time, dust accumulates and passes through the air filter 14. In addition, the air resistance increases rapidly, and contaminates the air, and also causes an icing phenomenon of the evaporator 18 which will be described later.

On the other hand, in one example, in a vehicle air conditioner to which an external variable compressor or an electric compressor is applied, the target temperature of the evaporator 18 is set to a lower limit according to the stage of operation of the blower 12 in order to prevent icing of the evaporator 18. Is regulated. At this time, when the outlet temperature of the evaporator 18 is lower than the target temperature, the refrigerant circulation is stopped, and when the refrigerant circulation is stopped, the air is not cooled in the evaporator 14, so that the evaporator outlet temperature gradually increases, and the evaporator outlet temperature is increased. When the temperature rises above the limit temperature, the refrigerant circulates again.

If the number of stages of the blower 12 is high, the amount of air passing through the evaporator 18 is large, and heat exchange is active. Therefore, the target temperature of the evaporator 18 is lowered, and conversely, if the number of stages of the blower 12 is low, the evaporator 18 is low. Since the amount of air passing through is low and heat exchange is low, the target temperature of the evaporator 18 is made high and the icing phenomenon of the evaporator 18 is prevented.

However, when the dust is accumulated excessively in the air filter 14, even if the number of blueers 12 is high, air does not pass through the air filter 14 and thus cannot be delivered to the evaporator 18. There was a problem that the icing phenomenon can occur.

In addition, the prior art, even if the sensor to measure the actual amount of dust accumulated in the air filter 14 is not provided for the reason of the increase in manufacturing cost, or even if the dust amount measuring sensor is provided, regardless of the malfunction or the amount of dust, it is accurate Changing the air filter becomes difficult. Accordingly, there is a problem that the probability that an icing phenomenon of the evaporator 18 may occur due to the delay of replacement of the air filter 14 is increased.

Therefore, an object of the present invention for solving this problem is to compare the air conditioning use time and the filter replacement time, if it is determined that the air conditioning use time is equal to or greater than the filter replacement time, depending on the number of blowers until the air filter is replaced The present invention provides an air conditioner for a vehicle and a control method thereof which can change and control the target temperature and the cutoff temperature to improve the icing phenomenon of the evaporator which may be caused by dust accumulation in the air filter.

The present invention to achieve the above object is an evaporator; A blower for blowing air sucked through the air inlet to the evaporator; In the vehicle air conditioner comprising a control unit for controlling the evaporator and the blower, the air filter is installed in at least one of the upstream and downstream of the blower, the control unit, the air conditioning use time is compared with the filter replacement time filter When determined to be greater than or equal to the replacement time, and provides a vehicle air conditioning apparatus to prevent the icing phenomenon of the evaporator by changing and controlling the target temperature and the cut-off temperature of the evaporator variably according to the stage of the blower until the air filter is replaced. .

The air conditioning use time is a cumulative use time for the blower or a cumulative time after the vehicle is released. The control unit resets the air conditioning use time to 0 when it is determined that the air filter is replaced, and the initial target temperature of the evaporator. And by controlling the cutoff temperature can maintain the existing cooling performance.

In addition, the compressor is driven by the engine to compress the refrigerant and the discharge amount is changed in accordance with the cooling demand; A condenser for condensing the refrigerant discharged from the compressor; An expansion valve for adiabatic expansion of the liquefied refrigerant passing through the condenser to make a mixture of gas and liquid, and an opening degree of which is changed according to a refrigerant discharge amount of the compressor; An evaporator which cools the surrounding air using latent heat of evaporation when the refrigerant is evaporated and returns the refrigerant to the compressor; A blowing unit which blows the inside and the outside air to the evaporator; The outlet side of the evaporator includes an evaporator outlet temperature sensor for detecting the temperature of the air and a control unit for controlling the target temperature of the evaporator, the cut-off temperature according to the evaporator outlet temperature, air conditioning use time, filter replacement time input from the evaporator outlet temperature sensor Can be.

In addition, when the controller determines that the outlet temperature of the evaporator is lower than the target temperature of the evaporator, the controller may variably adjust the rotation speed of the compressor based on the changed target temperature and the cutoff temperature, or the refrigerant pressure discharged to the condenser and the expansion valve side. And the amount of refrigerant can be variably adjusted, or when the temperature of the outside air is higher than the temperature of the room air, the outside air can be introduced to prevent the temperature of the evaporator from falling.

In addition, the cutoff temperature of the evaporator is set to a temperature lower than the target temperature of the evaporator, and when the controller determines that the outlet temperature of the evaporator is lower than the cutoff temperature, the temperature of the evaporator is lowered by stopping the operation of the compressor. Can be prevented.

The controller may compare the air conditioning use time with the filter exchange time to determine whether the air conditioning use time is equal to or greater than the filter change time, and accordingly, increase or decrease the target temperature or the cutoff temperature of the evaporator according to the increase of the blower stage. have.

In addition, the operator may further include a display unit connected to the control unit to check the air conditioning use time, or to correct the filter replacement time.

In order to achieve the above object, the present invention provides a measurement step of measuring the air conditioning use time in the control unit; The comparison step of comparing the measured air conditioning using time and the filter replacement time in the control unit and the control unit determines that the air conditioning using time in the comparison step is equal to or greater than the filter replacement time, and according to the stage of the blower and the target temperature of the evaporator Provided is a control method of a vehicle air conditioner including a change step of changing the cutoff temperature variably.

In addition, in the comparison step, if it is determined that the air conditioning use time is less than the filter replacement time, it is possible to control the air conditioning apparatus by changing to the existing evaporator target temperature and the cutoff temperature.

The method may further include a determining step of determining the replacement of the air filter, wherein the determining step determines that the air conditioning use time is equal to or greater than the filter replacement time by the controller in the comparing step, and that the air filter is replaced. In this case, a change step of variably changing the target temperature and the cutoff temperature of the evaporator may be performed.

The method may further include a determining step of determining the replacement of the air filter, wherein the determining step may reset the air conditioning use time to zero when it is determined by the controller that the air filter is replaced.

In addition, the air conditioning use time may be a cumulative use time for the blower or a cumulative time after leaving the vehicle.

The control unit may vary the rotation speed of the compressor based on the target temperature and the cutoff temperature of the evaporator changed in the changing step, variably adjust the refrigerant pressure and the amount of refrigerant discharged to the condenser and the expansion valve, or the temperature of the external air. When the temperature of the indoor air is higher than the temperature of the indoor air, it is possible to prevent the temperature of the evaporator from falling.

According to the vehicle air conditioner and the control method thereof of the present invention described above, it is possible to improve the icing phenomenon of the evaporator which may be caused by the accumulation of dust in the air filter, especially in recent years in countries such as China, India, and Korea There is an effect that can reduce the arcing phenomenon that can occur in the evaporator in the air conditioning device of the vehicle running in a specific area generated.

1 is a schematic view showing an air conditioner equipped with a general air filter.
2 is a schematic view showing a vehicle air conditioner according to the present invention.
3 to 5 are flowcharts showing a control method of the vehicle air conditioner according to the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiment of the present invention may be modified in various forms, the scope of the invention should not be construed as limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art. Therefore, the shape of the elements in the drawings and the like may be exaggerated to emphasize a more clear description. It should be noted that the same members in each drawing are sometimes indicated by the same reference numerals. In addition, detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention are omitted.

2 is a schematic view showing a vehicle air conditioner according to the present invention.

How much dust is accumulated in the air filter 152, even if the expert can not check with the naked eye can not know well. In addition, in recent years, such as South Korea, China, India, and certain areas where a lot of dust is generated, excessive dust is generated, if the dust is excessively accumulated in the air filter 152, the icing phenomenon may be caused in the evaporator 140. The chances are high.

Therefore, as shown in Figure 2, the vehicle air conditioner according to the present invention is characterized in that the configuration to improve the icing phenomenon of the evaporator 140, which can occur due to the accumulation of dust on the air filter 152. In detail, the control unit 200 compares the air conditioning using time T1 and the filter replacing time T2 and determines that the air conditioning using time T1 is equal to or greater than the filter replacing time T2. It is characterized in that the target temperature and the cutoff temperature of the evaporator 140 is variably changed and controlled according to the number of stages of the blower 153.

On the other hand, the air conditioning use time (T1) described in the present invention is the cumulative use time for the blower 153 of the blowing unit 150 or the cumulative time after the vehicle is released, it is calculated by the controller 200. At this time, if it is determined that the air filter 152 has been replaced, the controller 200 resets the air conditioning use time T1 to 0, and accumulates the air conditioning use time T1 again from 0 to proceed with the calculation. In addition, the filter replacement time T2 may be fixed at approximately 2 to 3 years, and is fixed at the time of shipment of the vehicle, but may be arbitrarily changed according to the filter capacity of the air filter 152 and the size of the vehicle. Can be.

Accordingly, the icing phenomenon of the evaporator 140, which may be caused by the accumulation of dust in the air filter 152, may be improved, and in particular, a vehicle that is driven in a specific region where a lot of dust is generated in a country such as China, India, or Korea recently. It is effective to reduce the ashing phenomenon that may occur in the evaporator in the air conditioner.

Hereinafter, a vehicle air conditioner according to the present invention will be described based on FIG.

As shown in FIG. 2, the vehicle air conditioner according to the present invention includes a compressor 110 driven by an engine 100 to compress a refrigerant and change a discharge amount according to a cooling demand; A condenser 120 for condensing the refrigerant discharged from the compressor 110; An expansion valve 130 that thermally expands the liquefied refrigerant passing through the condenser 120 so that the gas and the liquid are mixed and changes its opening degree according to the amount of refrigerant discharged from the compressor 110; An evaporator 140 for cooling the ambient air by using latent heat of evaporation when the refrigerant is evaporated and returning the refrigerant to the compressor 110; A blowing unit 150 for blowing inside and outside air to the evaporator 140; On the outlet side of the evaporator 140, according to the evaporator outlet temperature, air conditioning use time (T1), filter exchange time (T2) input from the evaporator outlet temperature sensor 210 and the evaporator outlet temperature sensor 210 for detecting the temperature of the air. Control unit 200 for controlling the target temperature, the cutoff temperature of the evaporator 140.

In addition, the air blowing unit 150 is formed on the inlet side air inlet or outside air inlet 151; A blower 153 for blowing air sucked through the air inlet 151 toward the evaporator 140; The air filter 14 is installed at the front end of the motor 154 and the blower 153 to be driven in conjunction with the blower 153 to filter the air flowing in and out of the air inlet.

At this time, the air conditioning use time (T1) is set to 0 when the vehicle is initially released, and the time is accumulated after the vehicle is released by the controller 200, or the blower 153 of the blower unit 150 is connected to the motor 154. To accumulate during operation. In addition, when determining that the air filter 152 is replaced, the controller 200 resets the air conditioning use time T1 to 0, and accumulates the air conditioning use time T1 again from 0 to proceed with the calculation.

The filter replacement time T2 may be fixed, for example, from 2 years to 3 years, which is not a fixed amount, and there are various variables depending on the vehicle type, the dusty environment, the filter capacity of the air filter 152, Depending on the size of the vehicle, it can be changed by the operator to the most reasonable time through a number of tests.

In the control unit 200, the air conditioning use time T1 is continuously increased after the vehicle is released, or when the blower 153 is operated by the operation of the air conditioner or the heater by the vehicle occupant, the air conditioning use time T1 is increased. It can be done. At this time, the control unit 200 compares the increased air conditioning using time (T1) and the fixed filter changing time (T2) and determines that the air conditioning using time (T1) is equal to or greater than the filter changing time (T2), blower ( The target temperature and the cutoff temperature of the evaporator 140 may be variably changed and controlled according to the number of stages 153.

Here, the target temperature of the evaporator 140 is a primary target temperature for preventing the icing phenomenon of the evaporator 140, and the controller 200 determines that the outlet temperature measured by the evaporator outlet temperature sensor 210 is lower than the target temperature. For example, the controller 200 variably adjusts the rotation speed of the compressor 110, variably adjusts the refrigerant pressure and the amount of refrigerant discharged to the condenser 120 and the expansion valve 130, or the temperature of the outside air is indoors. When the temperature is higher than the air temperature, the temperature of the evaporator 140 is prevented from being lowered by introducing external air.

In addition, the cutoff temperature of the evaporator 140 is set to a lower temperature than the target temperature of the evaporator 140, and is a secondary target temperature for preventing icing of the evaporator 140, and the control unit 200 evaporator exit temperature. When it is determined that the outlet temperature measured by the sensor 210 is lower than the cutoff temperature, the clutch 220 is turned off to stop the operation of the compressor 110. This is to prevent the water vapor contained in the air is frozen in the condensed state in the evaporator 140 to inhibit the heat exchange. Accordingly, the refrigerant circulation is stopped, and when the refrigerant circulation is stopped, the air is not cooled in the evaporator 140, so that the evaporator outlet temperature gradually increases, and when the evaporator outlet temperature rises above the threshold temperature, the clutch 220 The compressor 110 is operated again when it is connected. For example, in the related art, the cutoff temperature of the evaporator 140 is set to 0.6 degrees to prevent the icing phenomenon of the evaporator 140.

On the other hand, the air filter 152 is the dust accumulated over time, even by the operation of the blower 153 does not flow air into the air inlet 151 flexibly to reduce the amount of air passing through the evaporator 140, If the air volume decreases, sufficient heat exchange between the air and the evaporator 140 does not occur, and thus the temperature of the evaporator 140 is further lowered, thereby causing an icing phenomenon, and the air passing through the evaporator 140 gradually decreases, resulting in the interior of the vehicle. In the cold air is not discharged.

That is, when a lot of dust is accumulated in the air filter 152, even if the number of stages of the blower 153 is eight stages due to the icing phenomenon of the evaporator 140, the air volume less than one stage comes out to the occupant, and inconvenience occurs, Heat exchange in the evaporator 140 is not made sufficiently, the icing phenomenon will be more serious.

Therefore, the control unit 200 compares the air conditioning use time T1 and the filter exchange time T2 and determines that the air conditioning use time T1 is equal to or greater than the filter replacement time T2. Until the target temperature and the cutoff temperature of the initial evaporator 140 is changed to a variable target temperature according to the stage of the blower 153 to control.

Table 1 below is a table showing the target temperature of the evaporator 140 varied according to the target temperature of the initial evaporator 140 and the stage of the blower 153.

Blower singular Initial target temperature Variable target temperature 3 4 ℃ 5 ℃ 4 3.5 ℃ 4.5 ℃ 6 2.5 ℃ 4 ℃ 7 2 ℃ 4 ℃

Table 2 below is a table showing the cutoff temperature of the evaporator 140 varied according to the cutoff temperature of the initial evaporator 140 and the stage of the blower 153.

Blower singular Initial cutoff temperature Variable Cutoff Temperature 1 to 4 0.6 ℃ 1.9 ℃ 5 to 6 steps 0.6 ℃ 1.5 ℃ 7 to 8 steps 0.6 ℃ 1.0 ℃

As can be seen from Table 1 and Table 2, it can be seen that the variable target temperature and the cutoff temperature are higher than the initial target temperature and the cutoff temperature.

That is, in the vehicle air conditioner according to the present invention, when the control unit 200 compares the air conditioning use time T1 with the filter replacement time T2, and determines that the filter replacement time has been exceeded, the control unit 200 determines a predetermined time to the air filter 152. It is expected to reduce the amount of air due to the accumulation of dust to change the initial target temperature of the evaporator 140 and the cutoff temperature to a variable cutoff temperature having a relatively high temperature. When the control unit 200 is controlled by changing to a variable cutoff temperature having a relatively high temperature, the refrigerant pressure and the amount of refrigerant discharged to the condenser 120 and the expansion valve 130 before the icing phenomenon of the evaporator 140 occurs. Since it is possible to variably adjust or stop the operation of the compressor 110, there is an effect that can improve the icing phenomenon of the evaporator 140.

In this case, the change of the cutoff temperature of the evaporator 140 by the controller 200 may be formed in the form of a gradual temperature drop in accordance with the increase of the number of blowers 153, and it is preferable to set it to drop by a certain ratio. For example, the temperature can be lowered by 0.5 ° C. or by 0.4 ° C., which is not a fixed amount, and various variables exist according to the vehicle type, and since the capacity of the compressor 110 is different, the most reasonable temperature is obtained through a plurality of tests for each vehicle type. The amount of descent can be determined.

In addition, when the control unit 200 determines that the air filter 152 has been replaced, the air conditioning use time T1 is set to 0, and the initial target temperature and the cutoff temperature are controlled to maintain the existing cooling performance.

In this case, for example, the operator may notify the exchange of the air filter 152 through the operation unit 230 connected to the control unit 200 after replacing the air filter 152, and separately set the air conditioning use time T1 to 0. Can be set with In addition, the operator may check the air conditioning use time T1 or correct the filter replacement time T2 by the display unit 240 connected to the control unit 200.

In summary, the vehicle air conditioner according to the present invention compares the air conditioning use time T1 with the filter replacement time T2, and if the air conditioning use time T1 is equal to or greater than the filter replacement time T2, the currently set target temperature. And correcting the cutoff temperature by a predetermined temperature, and recalibrating the initial target temperature and the cutoff temperature if the air conditioner use time T1 is lower than the filter replacement time T2 by replacing the air filter 152. While continuously performing the icing phenomenon of the evaporator 140 will be prevented.

In addition, the present invention does not directly measure the amount of dust accumulated in the air filter 152, but indirectly determined through the air conditioning use time (T1), and based on this, the amount of inflow air to the evaporator 140 is expected to reduce the evaporator target It is characterized by the fact that the temperature and the cutoff temperature can be variably changed / corrected according to the number of stages of the blower 153.

Hereinafter, a control method of a vehicle air conditioner according to the present invention will be described.

3 to 5 are flowcharts showing a control method of the vehicle air conditioner according to the present invention.

First, as shown in Figure 3, the control method of the vehicle air conditioner according to the present invention includes a measuring step (S100) for measuring the air conditioning use time (T1); A comparison step (S200) of comparing the air conditioning use time (T1) and the filter exchange time (T2); The determination step (S300) of determining the replacement of the air filter 152 and the changing step (S600) of changing the target temperature and the cutoff temperature of the evaporator 140.

First, in the measuring step S100, the control unit 200 measures the air conditioning use time T1. The air conditioning use time (T1) is set to 0 when the vehicle is initially shipped, and the time is accumulated after the vehicle is released by the controller 200, or the blower 153 of the blower unit 150 is connected to the motor 154. Accumulate during driving.

In the comparison step (S200), the control unit 200 compares the air conditioning use time (T1) and the filter replacement time (T2), the filter replacement time (T2) is a fixed value, for example, fixed at 2 to 3 years. It can be changed by the operator in various circumstances or through multiple tests and at the most reasonable time.

If it is determined that the air conditioning use time T1 is smaller than the filter replacement time T2 in this step, the control unit 200 controls the air conditioning apparatus using the target temperature and the cutoff temperature of the existing evaporator 140 (S400). On the contrary, if it is determined that the air conditioning use time T1 is equal to or greater than the filter replacement time T2, the controller 200 performs a determination step S300 of determining whether the air filter 152 is replaced.

Alternatively, as shown in FIG. 4, in the comparing step S200, the control unit 200 compares the air conditioning use time T1 with the filter exchange time T2 to compare the air conditioning use time T1 with the filter replacement time T2. If it is determined to be large or large, the change step (S600) of changing and controlling the target temperature and the cutoff temperature of the evaporator 140 in accordance with the number of stages of the blower 153 may be performed.

In the determination step (S300) it is determined whether the air filter 152 is replaced. In this case, if it is determined in step S300 that the air filter 152 is replaced, the air conditioning use time T1 is reset to 0 (S500). That is, in this step, when the control unit 200 determines that the air filter 152 is replaced, the air conditioning use time T1 is reset to 0, and the air conditioning use time T1 is accumulated again from 0 to proceed with the calculation.

In addition, when it is determined in operation S300 that the control unit 200 determines that the air filter 152 has not been replaced, the changing step of variably controlling and controlling the target temperature and the cutoff temperature of the evaporator 140 according to the number of stages of the blower 153. To perform (S600).

In addition, as shown in Figure 6, the determination step (S300) may be performed separately without being bound to the comparison step (S200), if it is determined that the air filter 152 is replaced, the air conditioning use time (T1) is reset to zero (S500) You can do it.

By repeatedly performing such a process, the icing phenomenon of the evaporator 140 is prevented.

Embodiment of the vehicle air conditioner and the control method of the present invention described above is merely exemplary, and those skilled in the art to which the present invention pertains various modifications and other equivalent embodiments therefrom are possible. You can see the point well. Therefore, it will be understood that the present invention is not limited to the forms mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims. It is also to be understood that the present invention includes all modifications, equivalents and substitutions within the spirit and scope of the invention as defined by the appended claims.

100: engine 110: compressor
120: condenser 130: expansion valve
140: evaporator 150: air blowing unit
151: air inlet 152: air filter
153: blower 154: motor
200 control unit 210 evaporator outlet temperature sensor
230: operation unit 240: display unit
T1: Air Conditioning Use Time T2: Filter Change Time
S100: measuring step S200: comparing step
S300: judgment step S600: change step

Claims (15)

Evaporator 140; A blower 153 for blowing air sucked through the air inlet 151 toward the evaporator 140; In the air conditioner for a vehicle comprising an air filter 152 installed at least one of the upstream and downstream of the blower 153 and a control unit 200 for controlling the evaporator 140 and the blower 153,
The control unit 200,
When the air conditioning using time (T1) and the filter changing time (T2) are determined to determine that the air conditioning using time (T1) is equal to or greater than the filter changing time (T2), the target temperature and the cutoff temperature of the evaporator 140 are changed to high control. Vehicle air conditioning system. The method according to claim 1,
The control unit 200,
When the air conditioning use time (T1) and the filter replacement time (T2) are compared to determine that the air conditioning use time (T1) is equal to or greater than the filter replacement time (T2),
Vehicle air conditioning to prevent the icing of the evaporator 140 by changing and controlling the target temperature and the cutoff temperature of the evaporator 140 in accordance with the number of stages of the blower 153 until the air filter 152 is replaced. Device. The method according to claim 1 or 2,
The air conditioning use time T1 is a cumulative use time for the blower 153 or a cumulative time since the vehicle is released.
If the air filter 152 determines that the air filter 152 has been replaced, the controller 200 resets the air conditioning use time T1 to 0 and maintains the existing cooling performance by controlling the initial target temperature and the cutoff temperature of the evaporator 140. Vehicle air conditioning system. The method according to claim 1 or 2,
A compressor 110 driven by the engine 100 to compress the refrigerant and change the discharge amount according to the cooling demand;
A condenser 120 for condensing the refrigerant discharged from the compressor 110;
An expansion valve 130 that thermally expands the liquefied refrigerant passing through the condenser 120 so that the gas and the liquid are mixed, and the opening degree is changed according to the refrigerant discharge amount of the compressor 110;
An evaporator 140 for cooling the ambient air by using latent heat of evaporation when the refrigerant is evaporated and returning the refrigerant to the compressor 110;
A blowing unit 150 which blows internal and external air to the evaporator 140;
On the outlet side of the evaporator 140, the evaporator outlet temperature sensor 210 for detecting the temperature of the air and the evaporator outlet temperature inputted from the evaporator outlet temperature sensor 210, the air conditioning operating time (T1), filter replacement time (T2) Vehicle air conditioning apparatus comprising a control unit 200 for controlling the target temperature, the cut-off temperature of the evaporator (140). The method according to claim 4,
The control unit 200,
When it is determined that the outlet temperature of the evaporator 140 is lower than the target temperature of the evaporator 140, the rotation speed of the compressor 110 is variably adjusted or the condenser (based on the changed target temperature and the cutoff temperature) of the evaporator 140 is determined. 120 and the refrigerant pressure and the amount of refrigerant discharged to the expansion valve 130, or when the temperature of the outside air is higher than the temperature of the indoor air flows into the outside air to prevent the temperature of the evaporator 140 falls. Vehicle air conditioning system. The method according to claim 4,
The cutoff temperature of the evaporator 140 is set to a temperature lower than the target temperature of the evaporator 140,
The control unit 200,
If it is determined that the outlet temperature of the evaporator 140 is lower than the cut-off temperature, the vehicle air conditioner to stop the operation of the compressor (110) to prevent the temperature of the evaporator (140) from falling. The method according to claim 6,
The control unit 200,
When the air conditioner use time T1 is compared with the filter change time T2 and it is determined that the air conditioner use time T1 is equal to or greater than the filter change time T2, the evaporator (3) increases according to the increase in the number of stages of the blower 153. Vehicle air conditioner, characterized in that to equalize or lower the target temperature or cutoff temperature of 140). The method according to claim 1 or 2,
And a display unit (240) connected to the control unit (200) such that an operator may check the air conditioning use time (T1) or correct the filter replacement time (T2). Measuring step (S100) of measuring the air conditioning use time (T1) in the control unit 200;
Comparing step (S200) of comparing the measured air conditioning using time (T1) and filter replacement time (T2) in the control unit 200 and
If the control unit 200 determines that the air conditioning using time (T1) is equal to or greater than the filter replacement time (T2) in the comparison step (S200), changing the target temperature and the cutoff temperature of the evaporator 140 to a high ( S600 control method for a vehicle air conditioner comprising a. The method according to claim 9,
The change step (S600),
If the control unit 200 determines that the air conditioning use time T1 is greater than or equal to the filter exchange time T2 in the comparing step S200, the target temperature and the cutoff of the evaporator 140 are cut according to the number of stages of the blower 153. Control method of a vehicle air conditioner to change the temperature variably. The method according to claim 8 or 9,
In the comparison step (S200),
If it is determined that the air conditioner use time (T1) is less than the filter replacement time (T2), the control method of the vehicle air conditioner for controlling the air conditioner by changing to the existing evaporator (140) target temperature and cutoff temperature (S400). The method according to claim 8 or 9,
Further comprising a determination step (S300) for determining the replacement of the air filter 152,
The determination step (S300),
If it is determined in the comparison step (S200) that the air conditioning use time (T1) is greater than or equal to the filter replacement time (T2) by the control unit 200, and it is determined that the replacement of the air filter 152, evaporator 140 Control method of a vehicle air conditioner for performing a changing step (S600) to change the target temperature and the cutoff temperature of the variable. The method according to claim 8 or 9,
Further comprising a determination step (S300) for determining the replacement of the air filter 152,
The determination step (S300),
If it is determined by the controller 200 that the air filter 152 is replaced, the control method of the vehicle air conditioner for resetting the air conditioning use time (T1) to zero (S500). The method according to claim 8 or 9,
The air conditioning use time (T1) is a control method of the vehicle air conditioner is a cumulative use time for the blower (153) or a cumulative time after leaving the vehicle. The method according to claim 8 or 9,
The control unit 200,
The refrigerant pressure discharged to the condenser 120 and the expansion valve 130 or the variable number of revolutions of the compressor 110 is variably adjusted based on the target temperature and the cutoff temperature of the evaporator 140 changed in the changing step (S600). Control method of the vehicle air conditioner to variably adjust the amount of refrigerant, or when the temperature of the outside air is higher than the temperature of the room air to prevent the fall of the temperature of the evaporator 140 by introducing the outside air.

Images