Heating resistor type air flow meter

Details Heating resistor type air flow meter Heating resistor type air flow meter

2007-01-30

2007-01-30

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

11138321

ABSTRACT:
In a heating resistor type air flow meter, a temperature characteristic of an air flow rate signal whose output value varies with temperature of the air flow meter circuitry is compensated by the temperature characteristic compensation circuit. The compensation circuit produces a temperature characteristic signal for compensation which changes in response to changes in an ambient temperature, and converts this signal into a predetermined proportional signal. The predetermined proportional signal is added to the air flow rate signal and such an addition result signal is input to the output control circuit and the temperature characteristic of the air flow rate signal is compensated. The resistors for proportional adjustment are external to and connected through a terminal to the IC of the air flow meter.

REFERENCES:
patent: 4450719 (1984-05-01), Nishimura et al.
patent: 4787251 (1988-11-01), Kolodjski
patent: 4984460 (1991-01-01), Isoda
patent: 0606983 (1994-07-01), None
patent: 1118842 (2001-07-01), None
patent: 1316781 (2003-06-01), None
patent: 05-157602 (1993-06-01), None
patent: 08-304136 (1996-11-01), None
patent: 09-203650 (1997-08-01), None
patent: 2001-201382 (2001-07-01), None

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