Thermal airflow meter

Details Thermal airflow meter Thermal airflow meter

2007-09-18

2007-09-18

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

Proportional

Reexamination Certificate

active

10560896

ABSTRACT:
A thermal airflow meter excellent in flow-rate measurement accuracy is provided. The airflow meter has a flow-rate measuring element comprising a heat resistor and a temperature-compensating resistor which are formed on the a first base member. A second base member of the airflow meter, provided with a drive circuit and a signal processor, is housed in a casing holding the flow-rate measuring element. The flow-rate measuring element is disposed in an air passage. Of two temperature sensors for measuring temperature at each of two points in the thermal airflow meter, respectively, a first temperature sensor is provided on the fist substrate of the flow-rate measuring element, and a second temperature sensor is provided inside the casing. The signal processor has a function of computing an airflow rate, an air temperature, and an air passage wall face temperature on the basis of an output signal of the flow-rate measuring element and respective output signals of the first and second sensors.

REFERENCES:
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patent: 5299594 (1994-04-01), Lord et al.
patent: 7051589 (2006-05-01), Igarashi et al.
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patent: 10-197309 (1998-07-01), None
patent: 2001-311637 (2001-11-01), None
patent: 2002-181602 (2002-06-01), None
patent: 33366818 (2002-11-01), None

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