G - Physics – 01 – F
Patent
G - Physics
01
F
73/69
G01F 1/68 (2006.01)
Patent
CA 1311942
ABSTRACT The airflow sensor uses a flow sensing bridge having a thermal element which senses airflow as a function of electrical energy applied to the bridge. Energy is applied to the bridge to maintain the thermal element at a constant temperature and constant resistance. A differential amplifier monitors the balanced and unbalanced state of the bridge and controls the application of energy to the bridge to maintain a balanced state. A microcomputer with analog to digital converter senses the level of energy applied to the bridge and converter this energy level to a digital signal indicative of airflow. The raw digital signal is corrected using calibration lookup tables and thermal compensation correction tables in the microcomputer memory circuits. The microcomputer outputs a variable frequency signal indicative of the measured mass airflow. In the alternative to the differential amplifier, the bridge may be balanced using the microcomputer in a sample and hold voltage to current converter configuration.
564637
Hock Darryl A.
Kaleita David L.
Zboralski James A.
Borden Ladner Gervais Llp
Hock Darryl A.
Jabil Circuit Company
Kaleita David L.
Zboralski James A.
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