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Today's automotive Air Induction Systems (AIS) are designed to deliver overall superior filtration performances because of increased engine protection requirements. In addition it must also meet packaging requirements, higher flow rates, lower system restriction, serviceability and induction noise. Studies have shown that the size and concentration levels of dust ingested need to be controlled to reduce engine wear. Major air filtration technologies currently available and used on AIS are also presented. Criteria for filter selection have also been discussed based on field data. Engineering and design parameters are also briefly discussed for developing robust engine air induction filters. Development of a new conical filter element is presented for the Ford ‘Conical AIS’ including performance data. This development also includes process/manufacturing and engineering specifications for the new conical program.

Fuel Vapor Storage Systems (FVSS) on automobiles are susceptible to particle contamination. This is especially true for FVSS components mounted under the automobiles (undercarriage, chassis frame, etc.) and required to meet stringent EPA standards. Particle contamination significantly increases system restriction and reduces the effectiveness of FVSS. This paper describes a dust separator/filter developed to protect the FVSS. Accelerated field durability evaluations and measurement techniques were developed to identify clean locations, ingested contamination levels and ingested contaminant size distributions. Based on field evaluations, test methods were developed in the lab to evaluate effectiveness of several devices to control and reduce contamination. The dust separator design developed was a combination of baffle separators in series with an open cell foam filter. The dust separator was designed to meet and exceed several vehicle system design requirements.