KR20080041465A - Ventilation system and control method - Google Patents

Abstract

The present invention relates to a ventilation system and a control method thereof. More particularly, the present invention relates to a ventilation system and a control method thereof capable of determining whether or not an abnormality of a duct installed in a ventilation path is provided.

To this end, the present invention provides a ventilation system having a ventilation duct, a fan motor for flowing air in the ventilation duct, and a microcomputer for controlling the fan motor, when the fan motor is in operation without adding a separate device. By detecting the operation output which is the output of the microcomputer, the detected operation output is compared with the normal output range which is the range of the operation output when the preset ventilation duct is normal and determines whether the ventilation duct is abnormal based on the comparison result. It makes the system easy to maintain and consequently avoids unnecessary energy loss.

Description

Ventilation system and control method

1 is a schematic view showing the structure of a ventilation system according to a first embodiment of the present invention.

2 is a block diagram showing the configuration of the ventilation system according to the first embodiment of the present invention.

3 is a flowchart illustrating a control method of a ventilation system according to a first embodiment of the present invention.

4 is a flowchart illustrating a control method of a ventilation system according to a second embodiment of the present invention.

5 is a flowchart illustrating a control method of a ventilation system according to a third embodiment of the present invention.

6 is a flowchart illustrating a control method of a ventilation system according to a fourth embodiment of the present invention.

7A and 7B are flowcharts illustrating a control method of a ventilation system according to a fifth embodiment of the present invention.

8A and 8B are flowcharts illustrating a control method of a ventilation system according to a sixth embodiment of the present invention.

* Description of symbols on the main parts of the drawings *

1: ventilation system 10: main body

20: supply duct 30: exhaust duct

100: micom

The present invention relates to a ventilation system and a control method thereof. More particularly, the present invention relates to a ventilation system and a control method thereof capable of determining whether or not an abnormality of a duct installed in a ventilation path is provided.

In general, in a closed indoor space, such as a home or office, the content of carbon dioxide (CO ₂ ) is increased over time by the human breathing, the air becomes turbid, thereby disturbing the human breathing.

Therefore, the muddy air of the indoor space closed by communicating indoors and outdoors by the air supply passage and the exhaust passage is discharged to the outside through the exhaust passage using an exhaust fan, and the outdoor pleasant air is discharged by the air supply fan. Ventilators have been developed to ventilate indoor air by introducing it into the room through an air supply passage.

Conventional ventilation devices are duct type ventilation devices in which the exhaust and air supply passages are formed by ducts, and when the ventilation devices are installed, installers may apply static pressure inside different ducts at different installation locations so as to obtain an optimum air flow. It was a method of calculating the length, cross-sectional area, etc. of a duct by calculating.

However, since this method cannot be properly adjusted according to the environment of the installation site or needs to be readjusted when the site static pressure changes, recently, the rotation speed of the fan is changed according to the static pressure environment inside the duct installed at the site. A method of control has been developed.

Such a method is disclosed in detail in Korean Patent Laid-Open Publication No. 2005-0021610.

However, in the case of the above method, in order to detect the static pressure fluctuations inside the duct, a separate static pressure sensing means such as a static pressure sensor must be provided. Nevertheless, many problems arise because they cannot be detected.

That is, when the inside of the duct is broken, the prior art controls only the rotational speed of the fan without leaving it, causing unnecessary power loss because the loss of air supply or exhaust occurs through the broken area.

In addition, when freezing occurs inside the duct to increase the flow resistance, the prior art increases the number of revolutions of the fan to maintain the set air volume while leaving it unnecessarily causing unnecessary power loss.

The present invention is to solve the above-described problems of the prior art, the purpose of the present invention is to determine whether the abnormality in the duct installed on the ventilation passage without adding a separate device to conveniently maintain the maintenance of the ventilation system As a result, to provide a ventilation system and a control method that can prevent unnecessary energy loss.

In order to achieve the above object, the present invention is a ventilation system having a ventilation duct, a fan motor for flowing air in the ventilation duct, a microcomputer to control the fan motor, information necessary for operation control of the ventilation system The microcomputer further includes a memory for storing the microcomputer, wherein the microcomputer detects a driving output of the microcomputer when the fan motor is in operation, and compares the detected driving output with a normal output range that is a range of the driving output when the ventilation duct is normal. Characterized in that the ventilation system to determine whether the ventilation duct abnormality.

In addition, the normal output range is characterized in that previously stored in the memory.

The microcomputer may determine the normal output range using the average value of the operating output detected during the first predetermined time and the reference output which is the output of the microcomputer for maintaining the set air volume under the internal pressure condition of the ventilation duct.

In addition, the reference output is characterized in that previously stored in the memory.

In addition, the memory calculates the average value of the microcomputer output detected while operating the fan motor during the second set time, determine the pressure in the ventilation duct according to the calculated average value, and the number of revolutions of the motor in accordance with the determined pressure And the average value of the microcomputer output detected while driving the fan motor for the third predetermined time at the determined motor speed is set as the reference output.

The microcomputer may determine that the ventilation duct is abnormal when the average value of the driving output detected during the fourth preset time is out of the normal output range.

The apparatus may further include a display unit for displaying an abnormality of the ventilation duct, wherein the microcomputer stops the operation of the ventilation system when it is determined that the ventilation duct is abnormal and controls the display unit to display that the ventilation duct is abnormal. .

The microcomputer may determine that the ventilation duct is abnormal when the number of times that the operation output has deviated from the normal output range is continuously set or more.

The apparatus may further include a display unit for displaying an abnormality of the ventilation duct, and the microcomputer stops the operation of the ventilation system when it is determined that the ventilation duct is abnormal and controls the display unit to display that the ventilation duct is abnormal. .

In addition, the present invention is a control method of a ventilation system having a ventilation duct, a fan motor for flowing air in the ventilation duct, a microcomputer for controlling the fan motor, the operation of the output of the microcomputer when the fan motor is in operation. Of the ventilation system which detects an output and compares the detected operation output with a normal output range which is a range of operation output when the ventilation duct previously stored in the memory is normal, and determines whether the ventilation duct is abnormal based on the comparison result. It features a control method.

In addition, it is characterized in that the ventilation duct is determined to be abnormal when the average value of the operation output detected during the set time is out of the normal output range.

In addition, it is characterized in that the ventilation duct is determined to be abnormal if the number of times that the operation output is out of the normal output range continuously set number or more.

In addition, if it is determined that the ventilation duct is abnormal, characterized in that it further comprises the step of stopping the operation of the ventilation system and indicating that the ventilation duct is abnormal.

In addition, the present invention is a control method of a ventilation system having a ventilation duct, a fan motor for flowing air in the ventilation duct, and a microcomputer for controlling the fan motor, wherein the set air volume is maintained at an internal pressure condition of the ventilation duct. The first step of setting the reference output which is the output of the microcomputer and the operation output which is the output of the microcomputer when the fan motor is in operation, and detecting the abnormality of the ventilation duct using the detected operation output and the reference output. The control method of the ventilation system consisting of a second step.

In addition, the first step may be set to a reference output value previously stored in the memory corresponding to the internal pressure of the ventilation duct and the set air volume.

In addition, the first step is to calculate the average value of the microcomputer output detected while operating the fan motor during the first set time, to determine the pressure in the ventilation duct according to the calculated average value, the rotation of the motor in accordance with the determined pressure The number is determined, and the average value of the microcomputer outputs detected while driving the fan motor for the second predetermined time at the determined motor rotation speed is set as the reference output.

Further, the second step is a third step and the third step of determining the normal output range which is the range of the operation output when the ventilation duct is normal by using the average value of the operation output detected during the third set time and the reference output After the operation output is out of the normal output range characterized in that the fourth step of determining that the ventilation duct is abnormal.

Further, the fourth step is characterized in that it is determined that the ventilation duct is abnormal when the average value of the operation output detected during the fourth set time is out of the normal output range.

In addition, the fourth step is characterized in that it is determined that the ventilation duct is abnormal when the number of times that the operation output is out of the normal output range continuously or more than the set number of times.

In addition, if it is determined that the ventilation duct is abnormal, characterized in that it further comprises the step of stopping the operation of the ventilation system and indicating that the ventilation duct is abnormal.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a schematic diagram showing the overall structure of a ventilation system according to a first embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of the ventilation system.

Referring to the structure of the ventilation system 1 of FIG. 1, the air supply passage 11 and the exhaust passage having inlets 11a and 12a and outlets 11b and 12b, respectively, in the main body 10 of the ventilation system 1, respectively. 12 is formed.

An air supply fan 13 and an air supply fan motor 141 are installed at one side of the main body 10 located at the outlet 11b side of the air supply flow path 11, and an exhaust flow path is provided at the same side as the air supply fan 13. An exhaust fan 14 and an exhaust fan motor 142 are provided on the outlet 12b side of the 12.

The air supply passage 11 and the exhaust passage 12 are provided to intersect with each other, and the cross section is provided with a total heat exchanger 15 for exchanging heat between the air of the exhaust passage 12 and the air of the supply passage 11. .

As the air supply fan 13 of the main body 10 rotates, air introduced through the inlet 11a of the air supply passage 11 is discharged to the outside of the main body 10 through the outlet 11b of the air supply passage 11. As the exhaust fan 14 rotates, air introduced through the inlet 12a of the exhaust passage 12 is discharged to the outside of the main body 10 through the outlet 12b of the exhaust passage 12.

The outdoor air discharged from the outlet 11b of the air supply passage 11 of the main body 10 is introduced into the room from the indoor side air supply port 21 via the air supply duct 20, and the indoor air discharged to the outside is indoor side. It is sucked by the exhaust port 31 and flows into the inlet 12a of the exhaust passage 12 of the main body 10 via the exhaust duct 30.

When an input signal for operating the ventilation system 1 is input through the input unit 110, the microcomputer 100 transmits a signal for operating the ventilation system 1 to the fan motor driver 140 according to the received input signal. Output

In this case, the input signal is any one of at least one operation mode divided according to the air volume, and the microcomputer 100 supplies the air supply fan motor 141 according to the operation program previously stored in the memory 130 in response to the input operation mode. ) And a signal for controlling the operation of the exhaust fan motor 142.

In addition, the microcomputer 100 controls the operation time of the air supply fan 13 and the exhaust fan 14 by using the timer 120, and the display unit when it is determined that the air supply duct 20 or the exhaust duct 30 is abnormal. The control signal is transmitted to 150 to display it.

3 is a flowchart illustrating a control method of the ventilation system according to the first embodiment of the present invention. As an example, a control method of determining whether or not an air supply duct 20 is abnormal will be described.

When the operation mode is input through the input unit 110 (S10), the microcomputer 100 drives the air supply fan motor 141 according to the operation program previously stored in the memory 130 in response to the input operation mode. The air supply fan 13 is operated by outputting a control signal (S20).

In this case, the operation mode is divided into a plurality of operation modes according to the air volume, for example, may be divided into a turbo wind, a strong wind and a weak wind mode.

When the air supply fan 13 is operated by the step S20, the microcomputer 100 operates the timer 120 and detects an operation output that is an output of the microcomputer 100 when the air supply fan motor 141 is in operation, thereby storing the memory 130. ) And (S30, S40).

When the storage of the operation output is completed in step S40, the microcomputer 100 determines whether the operation time T of the air supply fan motor 141 is greater than or equal to the set time (Tset) (S50), which is less than the set time (Tset). If the case returns to step S40 and if the set time (Tset) or more, the average value of the operation output stored in the memory 130 is calculated (S60).

The microcomputer 100 compares the average value calculated in step S60 with the normal output range previously stored in the memory 130 (S70). If the average value is within the normal output range, the microcomputer 100 returns to step S30 and leaves the normal output range. In this case, the operation of the ventilation system 1 is stopped and the display unit 150 is controlled to indicate that there is an abnormality in the air supply duct 20 (S80).

In this case, the normal output range means the range of the microcomputer 100 output in the operation mode in which the air supply duct 20 can be determined to be normal.

The control method can be used to determine whether the exhaust duct 30 is abnormal, and at the same time, it is also applicable to each of the air supply duct 20 and the exhaust duct 30.

Hereinafter, a second embodiment of the present invention will be described in detail with reference to FIG. 4, and the structure and configuration of the ventilation system are the same as the first embodiment, and the same reference numerals will be used and the description thereof will be omitted.

4 is a flowchart illustrating a control method of the ventilation system according to the second embodiment, and as an example, a control method of determining whether an air supply duct is abnormal or not.

When the operation mode is input through the input unit 110 (S110), the microcomputer 100 may drive the air supply fan motor 141 according to the operation program previously stored in the memory 130 in response to the input operation mode. The air supply fan 13 is operated by outputting a control signal (S120).

In this case, the operation mode is divided into a plurality of operation modes according to the air volume, for example, may be divided into a turbo wind, a strong wind and a weak wind mode.

When the air supply fan 13 is operated in step S120, the microcomputer 100 sets the variable count to 0 (S130), and detects the operation output that is the output of the microcomputer 100 when the air supply fan motor 141 is in operation. (S140).

After detecting the operation output in step S140, the microcomputer 100 compares the detected operation output with the normal output range previously stored in the memory 130 (S150), and returns to the step S130 if it is within the normal output range and is normal. If it is out of the output range, the value of the variable count is increased by one (S160).

In this case, the normal output range means the range of the microcomputer 100 output in the operation mode in which the air supply duct 20 can be determined to be normal.

When the step S160 is completed, the microcomputer 100 determines whether the value of the variable count is greater than or equal to the set value (S170), and if less than the set value, returns to step S140 and if the set value is greater than or equal to the operation of the ventilation system 1. To stop and control the display unit 150 to display the abnormality in the air supply duct (20) (S180).

At this time, the set value is the number of times of successive departures from the normal output range of the microcomputer 100 output, which means the number of departures sufficient to determine that an abnormality has occurred in the air supply duct 20, which is obtained experimentally.

The control method can be used to determine whether the exhaust duct 30 is abnormal, and at the same time, it is also applicable to each of the air supply duct 20 and the exhaust duct 30.

Hereinafter, a third embodiment of the present invention will be described in detail with reference to FIG. 5, and the structure and configuration of the ventilation system are the same as in the first embodiment, and the same reference numerals will be used and the description thereof will be omitted.

5 is a flowchart showing a control method of the ventilation system according to the third embodiment, and as an example, a control method for determining whether an air supply duct is abnormal or not.

When the operation mode is input through the input unit 110 (S210), the microcomputer 100 may drive the air supply fan motor 141 according to the operation program previously stored in the memory 130 in response to the input operation mode. The air supply fan 13 is operated by outputting a control signal (S220).

In this case, the operation mode is divided into a plurality of operation modes according to the air volume, for example, may be divided into a turbo wind, a strong wind and a weak wind mode.

When the air supply fan 13 is operated by the step S220, the microcomputer 100 operates the timer 120 and detects the operation output that is the output of the microcomputer 100 when the air supply fan motor 141 is operating. In operation S230 and S240.

When the storage of the operation output is completed in step S240, the microcomputer 100 determines whether the operation time T of the air supply fan motor 141 is greater than or equal to the first set time Tset1 (S250). If less than Tset1, the process returns to step S240, and if more than the first set time Tset1, the average value of the driving outputs stored in the memory 130 is calculated (S260).

When the step S260 is completed, the microcomputer 100 obtains the normal output range using the reference output stored in the memory 130 and the average value obtained in the step S260 (S270).

In this case, the reference output refers to the output of the microcomputer 100 to maintain the set air volume of the operation mode in the pressure state inside the air supply duct 20 of the ventilation system 1, the normal output range is the air supply duct ( It means the range of the microcomputer 100 output in the operation mode that can be determined that 20) is normal.

In addition, the normal output range may be obtained using an experimentally obtained relational formula. For example, in the present embodiment, {reference output-(average value of operation output x 0.1)} is defined as a lower limit and {reference output + (operation output of The average value x 0.1)} is the upper limit and may be calculated differently as necessary.

When the step S270 is completed, the microcomputer 100 operates the timer 120 and detects the operation output which is the output of the microcomputer 100 when the air supply fan motor 141 is in operation and stores it in the memory 130 (S280, S290).

When the storage of the operation output is completed in step S290, the microcomputer 100 determines whether the operation time T of the air supply fan motor 141 is greater than or equal to the second set time Tset2 (S300), and the second set time. If less than Tset2, the process returns to step S290, and if more than the second set time Tset2, the average value of the driving output stored in the memory 130 is calculated (S310).

The microcomputer 100 compares the average value calculated in step S310 with the normal output range calculated in step S270 (S320). If the average value is within the normal output range, the microcomputer 100 returns to step S280. The operation of (1) is stopped and the display unit 150 is controlled to indicate that there is an abnormality in the air supply duct 20 (S330).

The control method can be used to determine whether the exhaust duct 30 is abnormal, and at the same time, it is also applicable to each of the air supply duct 20 and the exhaust duct 30.

6 is a flowchart illustrating a control method of the ventilation system according to the fourth embodiment, and as an example, a control method of determining whether an air supply duct is abnormal or not.

Steps S410 to S470 are the same as in the third embodiment, and thus redundant descriptions are omitted.

When the step S470 is completed, the microcomputer 100 sets the variable count to 0 (S480) and detects an operation output that is an output of the microcomputer 100 when the air supply fan motor 141 is in operation (S490).

After detecting the operation output in step S490, the microcomputer 100 compares the detected operation output with the normal output range calculated in step S470 (S500), and returns to the step S480 if it is within the normal output range and leaves the normal output range. If so, the value of the variable count is increased by one (S510).

When the step S510 is completed, the microcomputer 100 determines whether the value of the variable count is greater than or equal to the set value (S520), and if less than the set value, returns to step S490 and if the set value is greater than or equal to the operation of the ventilation system 1. The control unit 150 stops the display unit 150 to display the abnormality in the air supply duct 20 (S530).

At this time, the set value is the number of times of successive departures from the normal output range of the microcomputer 100 output, which means the number of departures sufficient to determine that an abnormality has occurred in the air supply duct 20, which is obtained experimentally.

The control method can be used to determine whether the exhaust duct 30 is abnormal, and at the same time, it is also applicable to each of the air supply duct 20 and the exhaust duct 30.

7A and 7B are flowcharts illustrating a control method of the ventilation system according to the fifth embodiment, and as an example, a control method of determining whether or not an air supply duct is abnormal will be described.

When the operation mode is input through the input unit 110 (S610), the microcomputer 100 outputs a control signal for driving the air supply fan motor 141 at a preset rotation speed stored in the memory 130 to supply the air supply fan 13. ) And detects the operation output which is the output of the microcomputer 100 when the air supply fan motor 141 is operating for the first predetermined time and calculates an average value thereof (S620).

When the step S620 is completed, the microcomputer 100 supplies the air supply duct 20 by using correlation data between the average value of the driving output at the set rotation speed previously stored in the memory 130 and the internal pressure of the air supply duct 20. Calculate the pressure inside (S630).

When the step S630 is completed, the microcomputer 100 uses the correlation data between the internal pressure of the air supply duct 20 and the rotation speed of the air supply fan motor 13 in the operation mode previously stored in the memory 130. A control signal for calculating the proper air supply fan motor 141 rotational speed and adjusting the air supply fan motor 141 rotational speed to the calculated rotational speed is transmitted to the fan motor driver 140 (S640).

At this time, the number of revolutions of the appropriate air supply fan motor 141 means the number of revolutions to maintain the set air volume in the operation mode under the pressure condition inside the air supply duct 20 calculated in step S630.

When the step S640 is completed, the microcomputer 100 drives the air supply fan motor 141 at the adjusted rotation speed, detects the operation output of the microcomputer 100 during the second set time, calculates an average value thereof, and sets the reference output. (S650)

In this case, the reference output refers to the output of the microcomputer 100 to maintain the set air volume of the operation mode in the pressure state inside the air supply duct 20 of the ventilation system 1 as in the previous embodiment.

When the step S650 is completed, the microcomputer 100 operates the timer 120 and detects an operation output which is the output of the microcomputer 100 when the air supply fan motor 141 is in operation and stores it in the memory 130 (S660, S670).

When the storage of the operation output is completed in step S670, the microcomputer 100 determines whether the operation time T of the air supply fan motor 141 is greater than or equal to the third set time Tset3 (S680). If less than Tset3, the process returns to step S670, and if more than the third set time Tset3, the average value of the driving outputs stored in the memory 130 is calculated (S690).

When the step S690 is completed, the microcomputer 100 obtains the normal output range using the reference output set in step S650 and the average value calculated in step S690 (S700).

At this time, the normal output range means the range of the microcomputer 100 output in the operation mode that can determine that the air supply duct 20 is normal as in the previous embodiment.

In addition, the normal output range may be obtained using an experimentally obtained relational formula. For example, in the present embodiment, {reference output-(average value of operation output x 0.1)} is defined as a lower limit and {reference output + (operation output of The average value x 0.1)} is the upper limit and may be calculated differently as necessary.

When the step S700 is completed, the microcomputer 100 operates the timer 120 and detects the operation output which is the output of the microcomputer 100 when the air supply fan motor 141 is in operation and stores it in the memory 130 (S710, S720).

When the storage of the operation output is completed in step S720, the microcomputer 100 determines whether the operation time T of the air supply fan motor 141 is greater than or equal to the fourth set time Tset4 (S730), and the fourth set time. If less than Tset4, the process returns to step S720, and if more than the fourth set time Tset4, the average value of the driving outputs stored in the memory 130 is calculated (S740).

The microcomputer 100 compares the average value calculated in step S740 with the normal output range calculated in step S700 (S750). If the average value is within the normal output range, the microcomputer 100 returns to step S710. The operation of (1) is stopped and the display unit 150 is controlled to indicate that there is an abnormality in the air supply duct 20 (S760).

The control method can be used to determine whether the exhaust duct 30 is abnormal, and at the same time, it is also applicable to each of the air supply duct 20 and the exhaust duct 30.

8A and 8B are flowcharts illustrating a control method of the ventilation system according to the sixth embodiment, and as an example, a control method of determining whether or not an air supply duct is abnormal will be described.

Steps S810 to S900 are the same as in the fifth embodiment, and thus redundant descriptions thereof will be omitted.

When the step S900 is completed, the microcomputer 100 sets the variable count to 0 (S910) and detects an operation output that is the output of the microcomputer 100 when the air supply fan motor 141 is in operation (S920).

After detecting the operation output in step S920, the microcomputer 100 compares the detected operation output with the normal output range calculated in step S900 (S930) and returns to step S910 if it is within the normal output range and leaves the normal output range. If so, the value of the variable count is increased by one (S940).

When the step S940 is completed, the microcomputer 100 determines whether the value of the variable count is greater than or equal to the set value (S950), and if it is less than the set value, returns to step S920 and if the set value is greater than or equal to the operation of the ventilation system 1. The display unit 150 is controlled to display the abnormality in the air supply duct 20 (S960).

At this time, the set value is the number of times of successive departures from the normal output range of the microcomputer 100 output, which means the number of departures sufficient to determine that an abnormality has occurred in the air supply duct 20, which is obtained experimentally.

The control method can be used to determine whether the exhaust duct 30 is abnormal, and at the same time, it is also applicable to each of the air supply duct 20 and the exhaust duct 30.

As described in detail above, the ventilation system and the control method according to the present invention whether the occurrence of abnormality in the duct installed on the ventilation flow path using the output change of the microcomputer to control the fan motor without adding a separate device Judgment can facilitate the maintenance of the ventilation system and as a result prevent unnecessary energy losses.

Claims (20)

A ventilation system having a ventilation duct, a fan motor for flowing air in the ventilation duct, and a microcomputer for controlling the fan motor, Further comprising a memory for storing information necessary for the operation control of the ventilation system, The microcomputer detects an operation output that is an output of the microcomputer while the fan motor is operating, and compares the detected operation output with a normal output range that is a range of the operation output when the ventilation duct is normal to determine whether the ventilation duct is abnormal. Ventilation system. The method of claim 1, The normal output range is stored in advance in the memory ventilation system. The method of claim 1, And the microcomputer determines a normal output range by using a reference value, which is an output of the microcomputer, for maintaining a set air volume under an internal pressure condition of the ventilation duct and an average value of the operating outputs detected during the first set time. The method of claim 3, The reference output is pre-stored in a memory. The method of claim 3, The memory calculates an average value of the microcomputer output detected while driving the fan motor for a second predetermined time, determines the pressure inside the ventilation duct according to the calculated average value, and determines the number of revolutions of the motor according to the determined pressure And setting the average value of the microcomputer output detected while driving the fan motor for the third predetermined time at the determined motor rotation speed as the reference output. The method according to any one of claims 1 to 5, And the microcomputer determines that the ventilation duct is abnormal when the average value of the driving output detected during the fourth preset time is out of the normal output range. The method of claim 6, It further includes a display unit for displaying the abnormality of the ventilation duct, The microcomputer stops the operation of the ventilation system when it is determined that the ventilation duct is abnormal and the display unit controls to display that the ventilation duct is abnormal. The method according to any one of claims 1 to 5, And the microcomputer determines that the ventilation duct is abnormal when the number of times that the operation output has deviated from the normal output range is equal to or greater than the set number of times continuously. The method of claim 8, It is further provided with a display unit for displaying the abnormality of the ventilation duct, The microcomputer stops the operation of the ventilation system when it is determined that the ventilation duct is abnormal and the display unit controls to display that the ventilation duct is abnormal. A control method of a ventilation system having a ventilation duct, a fan motor for flowing air in the ventilation duct, and a microcomputer for controlling the fan motor, When the fan motor is operating, the operation output which is the output of the microcomputer is detected, and the detected operation output is compared with the normal output range which is the range of the operation output when the ventilation duct previously stored in the memory is normal, and according to the comparison result. Control method of the ventilation system for determining whether the ventilation duct abnormality. The method of claim 10, And determining that the ventilation duct is abnormal when the average value of the operation output detected during the set time is out of the normal output range. The method of claim 10, And determining that the ventilation duct is abnormal when the number of times that the operation output has deviated from the normal output range is equal to or more than the predetermined number of times continuously. The method of claim 10 or 12, If it is determined that the ventilation duct is abnormal, stopping the operation of the ventilation system and indicating that the ventilation duct is abnormal. A control method of a ventilation system having a ventilation duct, a fan motor for flowing air in the ventilation duct, and a microcomputer for controlling the fan motor, A first step of setting a reference output, which is an output of a microcomputer, to maintain a set air volume under the internal pressure condition of the ventilation duct; and And a second step of detecting an operation output which is an output of the microcomputer while the fan motor is in operation, and determining whether the ventilation duct is abnormal by using the detected operation output and the reference output. The method of claim 14, The first step is a control method of the ventilation system to set a value previously stored in the memory as a reference output corresponding to the internal pressure of the ventilation duct and the set air volume. The method of claim 14, The first step is to calculate the average value of the microcomputer output detected while operating the fan motor during the first set time, to determine the pressure in the ventilation duct according to the calculated average value, the number of revolutions of the motor in accordance with the determined pressure And determining an average value of the microcomputer output detected while driving the fan motor for the second predetermined time at the determined motor rotation speed as the reference output. The method according to any one of claims 14 to 16, The second step is a third step of determining a normal output range which is a range of the operation output when the ventilation duct is normal using the average value of the operation output detected during the third set time and the reference output; and And a fourth step of determining that the ventilation duct is abnormal when the operation output after the third step is out of the normal output range. The method of claim 17, The fourth step is a control method of the ventilation system to determine that the ventilation duct is abnormal when the average value of the operation output detected during the fourth set time is out of the normal output range. The method of claim 17, The fourth step is a control method of the ventilation system to determine that the ventilation duct is abnormal if the number of times the operation output is out of the normal output range continuously more than the set number of times. The method according to any one of claims 14 to 19, Stopping the operation of the ventilation system and indicating that the ventilation duct is abnormal when the ventilation duct is determined to be abnormal.

Images