Airflow sensor and control circuit

Details Airflow sensor and control circuit Airflow sensor and control circuit

1987-02-27

1989-11-28

Lall, Parshotam S.

Boots, shoes, and leggings

731182, 7320414, G01F 168

Patent

active

048842150

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 converts 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.

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patent: 4089214 (1978-05-01), Egami et al.
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patent: 4475392 (1984-10-01), Ajagu et al.
patent: 4578996 (1986-04-01), Abe et al.
patent: 4616332 (1986-10-01), Robinson et al.
patent: 4649745 (1987-03-01), Kondo et al.
patent: 4680964 (1987-07-01), Sato et al.
patent: 4683539 (1987-07-01), Kanno et al.
patent: 4713765 (1987-12-01), Abe et al.
patent: 4794794 (1989-01-01), Djorup

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