Hot film type air flow quantity detecting apparatus applicable t

Details Hot film type air flow quantity detecting apparatus applicable t Hot film type air flow quantity detecting apparatus applicable t

1995-02-27

1998-02-10

Dougherty, Elizabeth L.

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

057171360

ABSTRACT:
In an apparatus for detecting airflow quantity applicable to a vehicular internal combustion engine, a slit is formed so that an insulating substrate is partitioned into a main substrate portion and a sub substrate portion. A first temperature sensitive resistor, a heat generated main resistor 31, and a second temperature sensitive resistor are formed on the main substrate portion in film forms in the order with respect to the forward air stream direction (A). A difference in the resistance values of the first and second temperature sensitive resistors 32 and 33 detects the air stream direction and detects the flow quantity according to a temperature variation (namely, the variation in resistance value) in the heat generated temperature sensitive main resistor due to the cooling caused by the intake air.

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