Measuring and testing – Volume or rate of flow – Thermal type
Patent
1987-06-26
1988-04-05
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
047350865
ABSTRACT:
A mass airflow meter having a first electrically heated resistive film and a temperature dependent resistive film sandwiched between plastic layers and positioned within an air duct. Symmetrically positioned around the first resistive film are a pair of electrically heated resistive films and associated temperature sensors, also encapsulated within plastic layers. Electronic circuitry applies electric power to the resistive films for maintaining each of them at a predetermined temperature above ambient air temperature regardless of airflow. Since the temperature and emissivity of each plastic layer is substantially equal, the thermal radiation of each is also substantially equal. The thermal radiation loss by the first resistive film is therefore balanced by a substantially equal thermal radiation gain. Accordingly, substantially all the heat transfer by the first resistive film is through convectional heat transfer to the airflow. An accurate measurement of airflow is thereby achieved.
REFERENCES:
patent: 1321546 (1919-11-01), Packard
patent: 3680377 (1972-08-01), Lightner
patent: 4214478 (1980-07-01), Lauterbach
patent: 4283944 (1981-08-01), Gruner et al.
patent: 4400975 (1983-08-01), McGarr
patent: 4635475 (1987-01-01), Jones et al.
SAE 860406, "Mass Airflow Sensor: Ambient Temperature Compensation Design Considerations", by Gurtcheff et al.--no date.
Abolins Peter
Ford Motor Company
Goldstein Herbert
Lippa Allan J.
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