초록 ▼

A system and a method are disclosed for changing a filter provided in an air purifier at an optimum time by measuring the rotational speed of a motor that operates the filter. The system for determining an air purifier filter change time includes: a motor speed measurement unit; a time counting unit

A system and a method are disclosed for changing a filter provided in an air purifier at an optimum time by measuring the rotational speed of a motor that operates the filter. The system for determining an air purifier filter change time includes: a motor speed measurement unit; a time counting unit; a speed determination unit; a time comparison unit; and a filter change time determination unit.

대표청구항 ▼

1. A system for determining an air purifier filter change time, the system comprising: a motor speed measurement unit configured to measure a rotational speed of a motor that operates a filter provided in the air purifier;a time counting unit configured to count time starting from the point when the

1. A system for determining an air purifier filter change time, the system comprising: a motor speed measurement unit configured to measure a rotational speed of a motor that operates a filter provided in the air purifier;a time counting unit configured to count time starting from the point when the motor starts rotating upon receiving power supplied thereto or from a point when power supplied to the motor is cut off;a speed determination unit configured to check whether or not the rotational speed of the motor has reached a pre-set speed;a time comparison unit configured to receive information regarding recorded motor running time from the time counting unit and comparing the recorded motor running time to a pre-set time duration, if the speed determination unit determines that the rotational speed of the motor has reached the pre-set speed; anda filter change time determination unit configured to check whether or not a filter change is required according to results obtained by comparing the time duration during which the rotational speed of the motor has reached the pre-set speed with the pre-set time duration. 2. The system of claim 1, wherein the time counting unit counts time starting from the point when the motor starts to rotate upon receiving power supplied thereto, the pre-set speed is a target speed, and if a time duration during which the rotational speed of the motor has reached the target speed is shorter than the pre-set time duration, the filter change time determination unit determined that a filter change is required. 3. The system of claim 1, further comprising: a power cutting unit configured to cut off the power supply to the motor if the rotational speed of the motor is equal to the pre-set speed,wherein if the power cutting unit cuts off the power supply to the motor, the time counting unit counts time starting from the point when the power supply to the motor is cut off, the speed determination unit checks whether or not the rotational speed of the motor has reached zero, and the time comparison unit compares a time duration during which the rotational speed of the motor has reached zero with the pre-set time duration, and if the time duration during which the rotational speed of the motor has reached zero is longer than the pre-set time duration, the filter change time determination unit determines that a filter change is required. 4. The system of claim 1, wherein when a filter change is required, the filter change time determination unit outputs a message informing about a filter change signal, or an alarm signal to a display unit. 5. A method for determining an air purifier filter change time, the method comprising: measuring the rotational speed of a motor that operates a filter provided in an air purifier;counting time starting from the point when the motor starts to rotate upon receiving power supplied thereto or from the point when power supply to the motor is cut off;checking whether or not the rotational speed of the motor has reached a pre-set speed;if it is determined that the rotational speed of the motor has reached the pre-set speed, comparing the recorded motor running time to a pre-set time duration; andchecking whether or not the filter is to be changed according to the result of the comparison obtained by comparing the time duration during which the rotational speed of the motor reached the pre-set speed with the pre-set time duration. 6. The method of claim 5, wherein, with regard to the recorded motor running time, time is counted starting from a point when the motor starts to rotate upon receiving power supplied thereto, the pre-set speed is a target speed, and in checking whether of not a filter change is required, if the time duration during which the rotational speed of the motor reached the target speed is shorter than the pre-set time duration, it is determined that a filter change is required. 7. The method of claim 5, further comprising: cutting off power supply to the motor if the rotational speed of the motor is the pre-set speed,wherein, in cutting off power supply to the motor, time is counted starting from the point when the power supply to the motor is cut off, in checking whether or not the rotational speed of the motor has reached the pre-set speed, it is checked whether or not the rotational speed of the motor has reached zero, in comparing the recorded motor running time with the pre-set time duration, a time duration during which the rotational speed of the motor has reached zero is compared with the pre-set time duration, and in determining whether or not a filter change is required, if the time duration during which the rotational speed of the motor has reached zero is longer than the pre-set time duration, it is determined that a filter change is required. 8. The method of claim 5, further comprising: when a filter change is required, outputting a message informing about a filter change signal, or an alarm signal to a display unit.