Dust filter presence determining device for internal combustion engine, has device designed as inductive proximity switch and/or reed contact and actuated by dust filter, and preliminary filter provided in upstream of dust filter

摘要

The device has a device (15) that can be actuated by a dust filter (13). The device is designed as an inductive proximity switch and/or as reed contact. The switch is controlled by a metallic part that is formed in the dust filter through a metallic filter boundary. A preliminary filter is provided in the upstream of the dust filter and has a foamed material unit.