Air filter unit for internal combustion engines

摘要

The present disclosure relates to an air filter unit (150) for attaching to a compressor (44) of a turbocharger of an internal combustion engine configured to combust an air/fuel mixture having a desired air-to-fuel ratio. The air filter unit (150) may comprise a housing (151) having an air inlet (156) and an air outlet (158) configured to be fluidly connected to the compressor (44). The air filter unit may further comprise an air filter (152) disposed within the housing (151) between the air inlet (156) and the air outlet (158). During operation of the internal combustion engine, the air inlet (156) may be adjustable in size with a cover device (160) having an adjustable cover member (162A to 162D) for at least partially controlling the air-to-fuel ratio.