Testing Automotive Engine and Interior Air Filters 970677

The primary purpose of using automotive engine and interior air filtration systems is to reduce the airborne contaminant level entering the engine and passenger compartment. However, the reasons for using such systems are different. The engine air filter should protect the engine from potentially abrasive contaminants causing engine wear. On the other hand, a well designed interior air filter can reduce the concentration of respirable particles, especially allergens, while increasing passenger comfort. The performance of engine and cabin air filters is evaluated by measuring filtration characteristics according to SAE J726 and J1669 standards respectively. To achieve the maximum performance of the filtration system under real conditions, the definition of filter performance must be closely related to the application of the filter.

In this paper, standards and filtration characteristics for both applications will be investigated. The relationship between the main function of the filter and defined filter performance is analyzed, and recommended changes to the test methods are made.