Fluid flow sensor

Details Fluid flow sensor Fluid flow sensor

2007-08-07

2007-08-07

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

C073S204260

Reexamination Certificate

active

11332352

ABSTRACT:
Two heat generating resistors are formed on a substrate in the upstream side with respect to an air flow direction and two other heat generating resistors are formed in the downstream side. A thermometer resistor for detecting a temperature in the intake manifold is formed on the substrate. A bridge circuit is formed of the heat generating resistors. A temperature of the four heat generating resistors is controlled to be at a predetermined temperature by balancing a bridge circuit constituted of the thermometer resistor or the like with a differential amplifier and a transistor. When air flows, electric potentials of the intermediate terminals in the bridge circuit change. A flow quantity and a flow direction of the air are calculated by detecting the electric potential difference.

REFERENCES:
patent: 4080821 (1978-03-01), Johnston
patent: 4343183 (1982-08-01), Plapp
patent: 5069066 (1991-12-01), Djorup
patent: 6047597 (2000-04-01), Kleinhans
patent: 6981411 (2006-01-01), Konzelmann et al.
patent: 2004/0211253 (2004-10-01), Horie et al.
patent: A-1-185416 (1996-02-01), None
patent: A-8-29228 (1996-02-01), None
patent: A-8-43162 (1996-02-01), None

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