Hot film anemometer for air mass measurement of airflow in internal combustion engine, has sensor units embedded in flow-type body such that side of units directed against direction of air flow is protected from contamination due to airflow

摘要

#CMT# #/CMT# The anemometer has two rod-shaped sensor units (2, 4) respectively serving as a temperature sensor and a heating unit. The sensor units are embedded in a flow-type body (6) such that a side of the sensor units directed against a direction of the air flow (S) is protected from contamination due to the airflow. One of the sensor units is exposed to the airflow only on a side that runs parallel to the air flow direction. A thermal isolation in the form of an air gap (L) is provided between the sensor units and the body, where the body is formed as a plate. #CMT#USE : #/CMT# Hot film anemometer for air mass measurement of airflow in an internal combustion engine. #CMT#ADVANTAGE : #/CMT# The sensor units are embedded in the flow-type body, such that the side of the sensor units directed against the direction of air flow is protected from contamination due to the airflow, thus avoiding changes in an output signal of the sensor units that leads to signal drifts, and hence improving sensitivity of the sensor units. The arrangement of ends of the sensor units avoids thermally caused mechanical stresses on the sensor units, and hence reducing the risk of breakage of the sensor units. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a top view of a hot film anemometer with sensor units in a flow-type body. L : Air gap S : Air flow 2, 4 : Sensor units 6 : Flow-type body 8, 10 : Slots.