Air flow meter with compensation of second stage delay of therma

Details Air flow meter with compensation of second stage delay of therma Air flow meter with compensation of second stage delay of therma

1988-09-22

1991-08-06

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320418, G01F 168

Patent

active

050367021

ABSTRACT:
A hot wire type air flow meter employing a hot wire temperature dependent resistor having a heat generating portion and a non-heat generating portion comprising a feedback control circuit controlling the hot wire temperature dependent resistor temperature constant which includes a phase shift circuit for inducing a sufficient phase delay in feedback signals thereby compensating a second stage delay in output signals of the air flow meter caused by the thermal inertia of the non-heat generating portion and enhancing response characteristic of the air flow meter.

REFERENCES:
patent: 4297881 (1981-11-01), Sasayama et al.
patent: 4311042 (1982-01-01), Hosoya et al.
patent: 4322970 (1982-09-01), Peter
patent: 4400974 (1983-08-01), Nishimura et al.
patent: 4523462 (1985-06-01), Kolodjski
patent: 4562731 (1986-01-01), Nishimura et al.
patent: 4715224 (1987-12-01), Kuhn

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