KR101253132B1 - Device for indicating exchange time of air filter - Google Patents

Abstract

The present invention relates to an air filter replacement time notification system, and more specifically, to calculate the amount of dust accumulated in the air filter based on the pollution degree, the air inflow time, and the air inflow air value of the air flowing into the air filter. If the cumulative total amount of dust accumulated in the accumulated air filter exceeds the standard value, the air filter should be replaced at the optimum time, so that the air filter can be replaced at the optimum time, and the indoor environment can be comfortably maintained. The present invention relates to an air filter replacement notification system that can prevent costly waste due to premature replacement of filters, and can also prevent problems such as in-vehicle air pollution due to delayed air filter replacement.

In the present invention, the internal and external air inlet doors are installed in the interior and exterior air inlet so as to selectively open and close the internal and external air inlet formed on the inlet side according to the internal and external air modes, and the air suctioned through the internal and external air inlet. In a system for informing the replacement time of the air filter in a vehicle air conditioner comprising a blower unit provided with a blower so as to blow to the side, and an air filter installed in at least one of upstream and downstream of the blower, the urban area and the suburbs An input means for receiving a vehicle driving ratio in an area, an air pollution calculating means for calculating a pollution degree of air flowing into the air filter according to the vehicle driving ratio input from the input means, and air flowing into the air filter Air inflow time calculating means for calculating the time to be made and the air flowing into the air filter side The air inlet air flow rate calculating means for calculating the air flow rate, display means for informing the replacement time of the air filter, the air pollution degree calculating means, the air inflow time calculating means, and the air inflow air flow rate calculating means, respectively, And calculating and integrating the dust supply amount or dust accumulation amount to the air filter side, and when the total dust accumulation amount of the accumulated air filter exceeds the reference value, a control unit for informing the replacement time of the air filter through the display means. It features.

Air conditioner, air filter, replacement time, dust supply amount, dust accumulation amount

Description

Air filter change time notification system {DEVICE FOR INDICATING EXCHANGE TIME OF AIR FILTER}

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

2 is a block diagram of a conventional air filter replacement time detection device.

3 is a flowchart showing a conventional method of detecting an air filter replacement time.

4 is a block diagram of an air filter replacement time notification system according to the present invention;

5 is a view for explaining the efficiency of the air filter in the air filter replacement time notification system according to the present invention.

Figure 6 is a graph comparing the cumulative amount of dust accumulated in the air filter dust accumulated in the air filter according to the calculation formula in the air filter replacement notification system according to the present invention.

Figure 7 is a flow chart illustrating when in the outside mode in the air filter replacement time notification method according to the present invention.

8 is a flowchart for explaining when the bet mode is in the air filter replacement time notification method according to the present invention;

DESCRIPTION OF THE REFERENCE NUMERALS

10: air blowing unit 11: inside and outside air conversion door

12: blower 13: blower motor

14: air filter 15: air conditioning case

18: evaporator 20: temperature control door

22: heater core 24: mode door

26: vent 28: control unit

30: operation unit

110: input means 120: air pollution calculation means

130: air inflow time calculation means 140: air inflow air flow calculation means

150: control unit 160: display means

The present invention relates to an air filter replacement time notification system, and more specifically, to calculate the amount of dust accumulated in the air filter based on the pollution degree, the air inflow time, and the air inflow air value of the air flowing into the air filter. If the cumulative total amount of dust accumulated in the accumulated air filter exceeds the standard value, the air filter should be replaced at the optimum time, so that the air filter can be replaced at the optimum time, and the indoor environment can be comfortably maintained. The present invention relates to an air filter replacement notification system that can prevent costly waste due to premature replacement of filters, and can also prevent problems such as in-vehicle air pollution due to delayed air filter replacement.

In general, a vehicle air conditioner is a device that cools or heats a vehicle interior by introducing indoor / external air and heating or cooling the air to blow into the interior of the vehicle, as shown in FIG. The internal and outdoor air conversion doors 10 are installed in the interior and exterior air inlets so as to selectively open and close the formed internal and external air inlets according to the internal and external air modes, and to blow air sucked through the internal and external air inlets to the air conditioning case. A blower unit installed so that the blower is driven by a motor, an evaporator and a heater core installed at a predetermined interval inside the air conditioning case, and installed between the evaporator and the heater core to adjust the amount of air passing through the heater core A temperature control door, a mode door that opens and closes a plurality of vents formed at an outlet side of the air conditioning case and communicates with an interior of a vehicle, It is made with an air filter, which is installed on the upstream side of the blower.

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, adjust the position of the temperature control door 20 and the mode door 24 or perform the temperature and various air conditioning modes.

That is, in the betting mode, the internal and external air conversion doors 23 open the internal air inlet 21 and the external air inlet 22 is sealed. At this time, the bet introduced through the internal air inlet 21 by the operation of the blower After passing through the air filter to the inside of the air conditioning case 40, it is guided to each vent while selectively passing through the heater core by the temperature control door and the mode door is discharged into the cabin.

In addition, in the external air mode, the internal and external air conversion door 23 seals the internal air inlet 21 and opens the external air inlet 22. In this case, the external air inlet 22 is introduced through the operation of the blower. Outside air is blown through the air filter to the inside of the air conditioning case, and then guided to each vent while selectively passing through the heater core by the temperature control door and the mode door to be discharged into the cabin.

However, the air filter 16 installed in the air conditioner filters dust in the air to purify the air flowing through the internal and external air inlets, and when used for a long period of time, dust accumulates and air resistance passes through the air filter 16. This will rise rapidly and will also pollute the air and should be replaced at the appropriate time.

As described above, an air filter replacement time detection apparatus has been proposed in Korean Patent Publication No. 10-1996-0023728 as a conventional technology for replacing an air filter at an appropriate time, and this will be described with reference to FIGS. 2 and 3. The filter replacement time detection device is for a vehicle equipped with a filter comprising a blower unit for blowing indoor or outdoor air of the vehicle, an evaporator unit connected to a discharge port of the blower unit, and a filter means installed at an inlet side of the evaporator unit. An air conditioner comprising: blower motor drive means (46) for driving a blower motor of said blower unit, and drive means (48) of intake air selector provided such that said blower unit selects and sucks outside air or indoor air; And display means (40) or warning means (42) for informing the replacement time of the filter means, and the suction hole. And a control means 44 for counting the drive time of the drive means 48 of the selection means and the blower motor drive means 46 to warn the warning means of the replacement time of the filter means. .

In addition, the air filter replacement timing detection method includes a filter including a blower unit for blowing indoor or outdoor air of a vehicle, an evaporator unit connected to a discharge port of the blower unit, and filter means provided at an inlet side of the evaporator unit. A method of detecting an air filter replacement time of an installed vehicle air conditioner, comprising: accumulating a driving time of the blower unit and a time of introducing the outdoor air, respectively (S10), the accumulated counted blower unit driving time and a preset time The two cumulative counted times may be set by comparing the proper air filter replacement period by driving the blower unit or comparing the accumulated counted outdoor air inflow time with a suitable air filter replacement period by the preset outdoor air inflow. Determining whether or not the period has been exceeded (S20), the two determinations First of all, it is characterized in that it comprises a step (S30) to give a filter replacement display or sound a warning at a time determined to be beyond the replacement period.

That is, the prior art is a technique of detecting the replacement time of the air filter by comparing only the driving means (outside air mode holding time) and the blower motor driving means (blowing time) of the intake air selecting means with the filter changing period, and another conventional technique. As a result, Korean Patent Publication No. 10-1996-0004754 is to detect the blower motor speed and load detection, motor overload to detect the air filter replacement time.

However, since the prior arts are notified of the replacement time regardless of the amount of dust actually accumulated on the air filter, it is difficult to accurately replace the air filter. In particular, the accuracy of the air filter replacement time is reduced due to the difference in pollution degree according to the operating area such as the downtown area and the suburban area, and the overload caused by the deterioration of the blower motor itself. There was a problem such as air pollution inside the vehicle due to delay of air filter replacement.

An object of the present invention for solving the above-mentioned problems is based on the pollution degree of the air flowing into the air filter, the air inlet time, the air inlet air flow rate value calculated according to the vehicle operation ratio in the downtown area and the suburban area as a factor After calculating and integrating the accumulated dust supply to the air filter, if the cumulative total amount of dust accumulated in the air filter exceeds the standard value, the air filter is replaced, and the air filter can be replaced at an optimal time. In addition, it is possible to maintain the comfort of the air filter, and to prevent the cost of unnecessary air filter replacement, as well as to provide an air filter replacement notification system that can prevent problems such as air pollution inside the vehicle caused by delayed air filter replacement.

The present invention for achieving the above object, the internal and external air inlet is formed in the interior and the outside air inlet to be selectively opened and closed according to the internal and external air mode formed on the inlet side through the internal and external air inlet A system for informing the time of replacement of the air filter in a vehicle air conditioner including a blower unit having a blower installed to blow air sucked into the air conditioning case, and an air filter installed at at least one of upstream and downstream of the blower. In an exemplary embodiment, an input unit may be configured to receive a vehicle driving ratio in a downtown area and a suburban area, an air pollution calculation unit configured to calculate a pollution degree of air flowing into the air filter according to the vehicle driving ratio input from the input unit. An air inflow time calculating means for calculating a time for introducing air into the air filter, and the air fill Air inlet air flow rate calculating means for calculating the air volume of the air flowing into the rotor side, display means for informing the replacement time of the air filter, the air pollution degree calculating means, air inflow time calculating means and air inlet air flow rate calculating means, respectively provided. After calculating and integrating the dust supply amount or dust accumulation amount to the air filter side using the value as a factor, when the total dust accumulation amount of the accumulated air filter exceeds the reference value, the display means to inform the replacement time of the air filter through the display means. It characterized in that it comprises a control unit.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings. In addition, the same structure as the conventional one will be described with reference to the conventional drawings.

Figure 4 is a block diagram of the air filter replacement time notification system according to the present invention, Figure 5 is a view for explaining the efficiency of the air filter in the air filter replacement time notification system according to the present invention, Figure 6 is according to the present invention This is a graph comparing the cumulative amount of dust accumulated in the air filter with the accumulated air filter dust in the air filter replacement notification system.

As shown, the air filter replacement time notification system according to the present invention, the input means 110, air pollution degree calculating means 120, air inlet time calculating means 130, air inlet air flow rate calculating unit 140, It consists of the control part 150 and the display means 160.

First, the input unit 110 receives a driving ratio according to a vehicle driving pattern in a downtown area and a suburban area from a driver. For example, a driver who drives a lot of time in an urban area may input a driving ratio of 70% in a downtown area and a driving ratio of 30% in a suburban area according to his vehicle driving pattern.

The air pollution calculation unit 120 calculates a pollution degree of air introduced into the air filter 14 according to the running ratio of the vehicle input through the input unit 110.

Here, the air pollution degree represents the weight of dust contained in a certain volume (㎥) of air (μg), and the method of obtaining the air pollution degree, the annual average air pollution degree in the urban area and suburban area in which the vehicle is operating (㎍ / The air pollution degree can be obtained by applying ㎥), and the annual average air pollution data is pre-stored in memory. Therefore, in order to obtain the pollution degree of the air flowing into the air filter 14, the pollution rate data of the urban area and the suburban area stored in the memory may be read and applied to each operation ratio.

On the other hand, as another method for obtaining the air pollution degree, the driver may be obtained through a method of directly inputting the degree of pollution degree set, or a sensor that can measure the air pollution degree upstream of the air filter 14 You can also get air pollution by installing.

In addition, the air inflow time calculating means 130 calculates a time for the air to flow into the air filter 14 side.

That is, the time is counted and calculated from the time point at which air starts to flow into the air filter 14 side, and the calculation time is calculated by counting the operation time of the blower 12 with a timer or the like. If the blower 12 is in the off state and the air conditioner is in the outside air mode, the time taken for driving the blower 12 in the off air mode state to the off state may be calculated. Can be.

Here, the reason for counting the operating time of the blower 12 in order to calculate the time that the air flows into the air filter 14 side, when the blower 12 is operating the air of the air filter 14 side This is because when the inflow is started and the operation time of the blower 12 is continuously counted, the total time of inflow of air can be known.

In addition, the reason for counting the time traveled in the blower 12 off state from the external air mode state in order to calculate the time that the air flows into the air filter 14 side, even if the blower 12 is in the off state When driving, the driving wind according to the driving of the vehicle is introduced into the air filter 14 through the outside air inlet. At this time, if the counting time of driving the blower 12 off in the outside mode is continuously counted, the total time of inflow of air is measured. Because you can see.

The air inflow air flow rate calculation unit 140 calculates the air flow rate of the air flowing into the air filter 14.

As a method of calculating the inflow air volume of the air, when the blower 12 is in the on state, the inflow air volume of the air is calculated by applying the inlet air volume of the blower 12, and the blower 12 is in the off state. When the air conditioner is in the external air mode, the air flow rate of the air may be calculated by applying the airflow amount due to the running wind of the vehicle.

At this time, since the air volume of the inlet side of the blower 12 varies depending on the number of stages of the blower 12 and the position of the mode door 24 and the temperature control door 20, the air volume according to the stage of the blower 12. In the case where the data and the air volume data according to the position of the mode door 24 and the temperature control door 20 are stored in the memory in advance, the air inflow air flowing into the air filter 14 is to be calculated. Simply load the airflow data stored in the memory.

In addition, since the air inflow speed and the air volume vary depending on the vehicle speed, the air flow rate due to the traveling wind is such that the air flowing into the air filter 14 in the state of storing the air volume data of the traveling wind according to the vehicle speed in advance in the memory. In order to calculate the air volume, the air volume data stored in the memory may be loaded. In addition, when the blower 12 is turned off in the outdoor air mode, the air volume 70 m 3 / Hr (CMH) represented by the ventilation condition may be used as the fixed air flow rate due to the running wind.

On the other hand, in order to obtain the air volume of the air flowing into the air filter 14 side, the air volume data of the inlet side of the blower 12 and the air volume data due to the running wind may be loaded from a memory that is stored in advance, but a calculation formula for calculating the air volume It is also possible to obtain the air flow rate of air by calculating with.

And, the controller 150, the air pollution degree calculation unit 120, the air inlet time calculation unit 130 and the air inlet air flow rate calculation unit 140 respectively provided values (contamination degree, air inlet time, air inlet air volume) After calculating and integrating the dust supply amount or dust accumulation amount to the air filter 14 side with a factor as a factor, if the total dust accumulation amount of the accumulated air filter 14 exceeds the reference value, the air through the display means 160 This is to inform the replacement time of the filter 14.

The display means 160 informs the driver of the replacement time of the air filter 14 when the total dust accumulation amount calculated by the controller 150 exceeds a reference value and the controller 150 outputs a control signal. . You can tell the driver by sound or video.

As described above, the degree of pollution of air introduced into the air filter 14 through the air pollution calculation unit 120, the air inflow time calculating unit 130, and the air inflow air volume calculating unit 140, respectively. The air inlet time, the air inlet air volume can be obtained, wherein the air pollution degree, the air inlet time, the air inlet air volume is applied differently depending on the air mode or the air mode of the air conditioning apparatus.

First, in the external air mode, when the blower 12 is in the on state, in order to calculate the supply amount according to the inflow of air first, the pollution degree is (contamination area x urban area operating ratio) + (suburban area pollution x long distance area). Running ratio) [Equation 1] is applied, the air inlet time is applied to the operating time of the blower 12, the air inlet air volume is preferably applied to the inlet side air volume of the blower 12,

When the blower 12 is in the off state, in order to calculate the dust supply amount according to the inflow of the running wind, the pollution degree is applied to the above [Equation 1], and the air inflow time is the blower 12 in the off-air mode. The traveling time is applied, and the air inflow air volume is preferably applied to the air flow caused by the traveling wind.

In the bet mode, when the blower 12 is in the first bet mode, in order to estimate the air pollution level in the vehicle interior and calculate the dust supply amount, the pollution degree applies the above [Equation 1]. , The air inlet time is applied to the operating time of the blower 12, the air inlet air volume is preferably applied to the inlet side air volume of the blower 12,

When the blower 12 is in a state other than the initial bet mode, in order to estimate the pollution degree by the amount of dust passing through the air filter 14, the pollution degree is determined by the air filter 14 with respect to the vehicle interior volume. ) Passage dust amount is applied, the air inflow time is applied to the operating time of the blower 12, the air inflow air volume is preferably applied to the inlet side air flow rate of the blower 12.

Here, the first bet mode state means the first bet mode state after starting the vehicle and operating the air conditioner and the blower 12, and the non-first bet mode state means the vehicle. After starting the air conditioner and the blower (12) after operating the betting mode state is not the first (first time) but the betting mode state.

On the other hand, in the betting mode, when the blower 12 is in the off state, the dust supply amount is "0".

And, the dust supply amount (n + 1), dust accumulation amount (n + 1) and total dust accumulation amount (n + 1), respectively, the following equation,

Dust supply amount (n + 1) (㎍) = pollution degree (㎍ / ㎥) × air inflow time (hr) × air inflow air volume (㎥ / hr) [Equation 2]

Dust accumulation amount (n + 1) = dust supply amount (n + 1) × filter efficiency

Total Dust Accumulation (n + 1) = Total Dust Accumulation (n) + Dust Accumulation (n + 1) [Equation 4]

It can calculate by Here, the dust accumulation amount n + 1 may be calculated by the following equation, dust accumulation amount n + 1 = dust accumulation amount n + dust supply amount n + 1.

[식5] 를 적용하는 것이 바람직하며, 이러한 경우를 제외하고는 모두 대기오염도를 공기오염도로 적용하면 된다.In the betting mode, when the blower 12 is not in the first betting mode, the contamination degree is estimated based on the amount of dust passing through the air filter 14.

It is preferable to apply Equation 5, except in this case, the air pollution degree may be applied as the air pollution degree.

[식6] 이며, 이때 먼지 통과량(차실내 유입)은, 다음식, 먼지 공급량-먼지 누적량으로 구할 수 있다. 아울러, 공기유입풍량이 변할 경우 에어필터(14)의 먼지 제거 효율도 변하므로 각 풍량에 따른 에어필터(14) 효율의 변화 상관식을 도출하고, 이렇게 도 출된 상관식을 이용하여 공기유입풍량에 따른 에어필터(14) 효율을 산출/적용할 수 있다. 한편, 상기 에어필터(14) 효율은 먼지 공급량에 대한 평균 효율을 대표 효율로 선정하여 적용할 수도 있다.5, the efficiency of the air filter 14 is,

At this time, the dust passage amount (inflow of the vehicle interior) can be obtained by the following equation, dust supply amount-dust accumulation amount. In addition, since the dust removal efficiency of the air filter 14 also changes when the air inflow air volume changes, a correlation equation of the change in the efficiency of the air filter 14 according to each air volume is derived, and the correlation equation thus derived is used to determine the air inflow air volume. The efficiency of the air filter 14 according to the above can be calculated / applied. On the other hand, the efficiency of the air filter 14 may be applied by selecting the average efficiency for the dust supply amount as a representative efficiency.

6 is a graph comparing the accumulated amount of dust accumulated in the air filter 14 and the accumulated amount of dust accumulated in the air filter 14 according to the calculation formula in the air filter change notification system according to the present invention. A is immediately after filter replacement (dust accumulation amount = 0), and K represents filter replacement time (dust accumulation amount = replacement time reference value). In addition, the vertical axis represents the dust accumulation amount, 0.0 is the dust accumulation amount immediately after replacing the filter, and 1.0 represents the filter replacement time notification reference value.

The graph shows the degree of matching between the data (Δ) measuring the amount of dust accumulated in the actual air filter 14 and the accumulated amount of dust data (*) calculated by the present invention, and similarly predicts the actual amount of dust accumulation. You can see it. In this case, when the gap between the measured weight line (dotted line) and the calculated weight line (solid line) is corrected, the actual accumulation amount of dust can be accurately estimated.

Hereinafter, an air filter replacement time notification method according to the present invention will be described.

7 is a flowchart illustrating a time when the air filter replacement time notification method according to the present invention in the outside air mode, and FIG. 8 is a flowchart illustrating a time when the air filter replacement time notification method according to the present invention is in the bet mode. Duplicate explanations with the air filter replacement timing notification system will be omitted.

First, referring to FIG. 7, when the flow chart in the external air mode is described, when the vehicle is started and the air conditioner is operated, it is determined whether the internal air mode or the internal air mode (S110, S120, and S130).

As a result of the determination, it is determined whether the blower 12 is in an on state or an off state in the external air mode (S140).

As a result of the determination, the dust supply amount n + 1 supplied to the air filter 14 is divided into the blower 12 on state and the blower 12 off state and the equations 2 and 3 are applied, respectively. ) And the dust accumulation amount n + 1 accumulated in the air filter 14 (S160) (S170).

At this time, when the blower 12 is in the on state, the pollution degree is the above [Equation 1], the air inlet time is the blower 12 operating time, the air inlet air volume is applied to the inlet side air volume of the blower 12 to the air The dust supply amount n + 1 and the dust accumulation amount n + 1 accumulated in the filter 14 are calculated.

In addition, when the blower 12 is in the off state, the pollution degree is [Formula 1], the air inflow time is the time when the blower 12 is turned off in the outside air mode, and the air inflow air amount is the amount of air caused by the running wind of the vehicle. Is applied to calculate the dust supply amount (n + 1) and dust accumulation amount (n + 1) accumulated in the air filter (14).

In addition, the efficiency of the said air filter 14 is computed by said Formula (6). In addition, when the air inflow air volume changes depending on the number of stages of the blower 12 or the position of the temperature control door 20 and the mode door 24, the dust removal efficiency of the air filter 14 also changes, so the air filter according to each air volume (14) A change correlation coefficient of efficiency may be derived, and the efficiency of the air filter 14 according to the air inflow air amount may be calculated / applied using the derived correlation equation. In this case, the efficiency of the air filter 14 may be applied by selecting the average efficiency for the dust supply amount as a representative efficiency.

On the other hand, the dust accumulation amount (n + 1) can be calculated by the above [Equation 3], but also the dust accumulation amount (n + 1) = dust accumulation amount (n) + dust supply amount (n + 1) have.

Subsequently, the total dust accumulation amount n + 1 accumulated in the air filter 14 is calculated by applying the above [Equation 4] (S190).

Finally, when the total dust accumulation amount (n + 1) calculated above exceeds a preset reference value, the exchange time of the air filter 14 is notified to the outside, otherwise the flow returns to the internal and external air discrimination step of step S130. (S200, S210).

Next, referring to FIG. 8, when the flowchart in the bet mode is described, when the vehicle is started and the air conditioner is operated, it is determined whether the bet mode or the outside mode is performed (S110, S120, and S130).

As a result of the determination, in the bet mode, the blower 12 determines whether it is in the initial bet mode or not in the initial bet mode (S150).

As a result of the determination, dust is supplied to the air filter 14 by dividing the blower 12 into an initial bet mode state and a state other than the initial bet mode and applying the above [Formula 2] and [Formula 3], respectively. The accumulated amount n + 1 accumulated in the supply amount n + 1 and the air filter 14 is calculated (S170) (S180).

At this time, in the initial bet mode, the pollution degree is [Equation 1], the air inlet time is the blower 12 operating time, the air inlet air volume is applied to the inlet side air volume of the blower 12 to the air filter 14 ), The dust supply amount (n + 1) and the dust accumulation amount (n + 1) are calculated.

In addition, when the state is not the initial bet mode, the pollution degree is [Equation 5], the air inlet time is the blower 12 operating time, the air inlet air volume is applied to the inlet side air volume of the blower 12 to the air filter The dust supply amount n + 1 and the dust accumulation amount n + 1 accumulated in 14 are calculated.

In addition, the efficiency of the said air filter 14 is computed by said Formula (6). In addition, when the air inflow air volume varies depending on the number of stages of the blower 12 or the position of the temperature control door 20 and the mode door 24, the dust removal efficiency of the air filter 14 also changes, so that the air filter according to each air volume. (14) A change correlation coefficient of efficiency may be derived, and the efficiency of the air filter 14 according to the air inflow air amount may be calculated / applied using the derived correlation equation. In this case, the efficiency of the air filter 14 may be applied by selecting the average efficiency for the dust supply amount as a representative efficiency.

On the other hand, the dust accumulation amount (n + 1) can be calculated by the above formula (3), but the dust accumulation amount (n + 1) = dust accumulation amount (n) + dust supply amount (n + 1) Can be.

Subsequently, the total dust accumulation amount n + 1 accumulated in the air filter 14 is calculated by applying the above [Equation 4] (S190).

Finally, when the total dust accumulation amount (n + 1) calculated above exceeds a preset reference value, the exchange time of the air filter 14 is notified to the outside, otherwise the flow returns to the internal and external air discrimination step of step S130. (S200, S210).

According to the present invention, the dust supply amount to the air filter side by using the pollution degree of the air flowing into the air filter, the air inlet time, the air inlet air flow value calculated according to the vehicle operation ratio in the urban area and the suburban area as a factor Alternatively, after calculating and accumulating dust accumulation, if the cumulative total amount of dust accumulated in the air filter exceeds the standard value, the air filter replacement time is notified, so that the air filter can be replaced at an optimal time to maintain a comfortable interior environment. In addition, it is possible to prevent cost waste due to unnecessary replacement of the air filter early, and also to prevent problems such as air pollution inside the vehicle caused by delay of air filter replacement.

Claims (6)

The internal and outdoor air conversion doors 11 are installed in the interior and exterior air inlets so as to selectively open and close the internal and external air inlets formed at the inlet side according to the internal and external air modes. Blower unit 10 is provided with a blower 12 so as to be blown to the side and the air filter in the vehicle air conditioner comprising at least one of upstream and downstream of the blower 12 of the air filter of the vehicle In the system that informs the exchange time, An input means (110) for receiving a vehicle driving ratio in an urban area and a suburban area; An air pollution calculation unit 120 for calculating a pollution degree of air flowing into the air filter 14 according to the vehicle running ratio input from the input unit 110; An air inflow time calculating unit 130 for calculating a time for introducing air into the air filter 14; Air inlet air flow rate calculation means 140 for calculating the air volume of air flowing into the air filter 14; Display means (160) informing the replacement time of the air filter (14); The amount of dust supplied to the air filter 14 or the cumulative amount of dust to the air filter 14 is calculated using the values provided by the air pollution degree calculating means 120, the air inflow time calculating means 130, and the air inflow air volume calculating means 140, respectively. After integration, the control unit 150 to notify the replacement time of the air filter 14 through the display means 160 when the total accumulated dust accumulation amount of the air filter 14 exceeds the reference value Air filter replacement time notification system, characterized in that comprises a. The method of claim 1, In outside mode, When the blower 12 is in the on state, the pollution degree is applied to the following formula, (city area pollution rate × urban area operating rate) + (urban area pollution degree × suburban area operating rate), and the air inflow time is the blower ( 12) is applied, the air inlet air flow rate air filter replacement time notification system, characterized in that for applying the air flow inlet side of the blower (12). The method of claim 1, In outside mode, When the blower 12 is in the off state, the pollution degree is applied to the following formula, (city area pollution rate × urban area operation rate) + (urban area pollution degree × suburban area operation rate), and the air inflow time is in the outdoor mode. The blower (12) applies the time traveled in the off state, the air inlet air flow rate notification system, characterized in that for applying the air flow amount by the running wind. The method of claim 1, In betting mode, When the blower 12 is in the initial betting mode, the pollution degree is applied to the following equation, (city area pollution rate × city area operation rate) + (urban area pollution degree × city area operation rate), and the air inflow time. Is applied to the operation time of the blower (12), the air inlet air flow rate notification system, characterized in that for applying the air volume of the inlet side of the blower (12). The method of claim 1, In betting mode, When the blower 12 is in a state other than the initial bet mode, the pollution degree applies the amount of dust passing through the air filter 14 to the vehicle interior volume, and the air inflow time is the operating time of the blower 12. And the air inflow air flow rate is applied to the inlet side air flow rate of the blower (12). The method according to claim 2 or 3, The urban area pollution degree and the suburban area pollution degree, the air filter replacement time notification system, characterized in that to apply the annual average air pollution level of the corresponding area where the vehicle is operating.

Images