Title:
DEVICE FOR MEASURING QUANTITY OF AIR
Document Type and Number:
Japanese Patent JPS5479070
Kind Code:
A
Abstract:
Airflow measuring apparatus utilizes a temperature-varying resistance layer on a carrier as a sensor. The resistance and temperature of the temperature-varying resistance layer are maintained substantially constant by a regulator circuit, independent of the amount of cooling by air flowing past the element. To minimize errors resulting from heating and cooling of the carrier, the surface of the carrier which does not have the temperature-varying resistance element is covered by a temperature-independent resistance layer and the current through the temperature independent resistance layer is controlled such that the temperature independent resistance layer is at substantially the same temperature as the temperature-varying resistance layer. Thus thermal gradients in the carrier are eliminated.
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Inventors:
HAINTSU RAUTERUBATSUHA
Application Number:
JP13947978A
Publication Date:
June 23, 1979
Filing Date:
November 14, 1978
Export Citation:
Assignee:
BOSCH GMBH ROBERT
International Classes:
G01F1/68; G01F1/692; (IPC1-7): G01F1/68
Domestic Patent References:
| JPS4948893A | 1974-05-11 | |||
| JPS5061080U | 1975-06-05 | |||
| JPS5087360A | 1975-07-14 | |||
| JPS5111943A | 1976-01-30 |