Among the thousands of parts of a car, the air filter is an extremely inconspicuous part because it is not directly related to the technical performance of the car, but in the actual use of the car, the air filter has a great impact on the service life of the car (especially the engine). On the one hand, without the filtering effect of the air filter, the engine will inhale a large amount of air containing dust and particles, resulting in serious wear of the engine cylinder; on the other hand, if it is not maintained for a long time during use, the filter element of the air filter will be full of dust in the air, which will not only reduce the filtering capacity, but also hinder the circulation of air, resulting in excessive mixture and abnormal engine operation. Therefore, it is very important to maintain the air filter on schedule.