Combustion engine air mass flow rate sensor unit has pivoted dirt screen moving into position and providing measurement at high flow rates

摘要

A combustion engine air mass flow rate sensor unit has a dirt screen unit (20) with adjustable (24) spring loaded pivoted screening element (22) that moves into a protective position in front of the sensor element (18) when the flow speed in the channel (4) exceeds a set value and whose movement then provides the measurement.