Air flow meter of a heating resistor type

Details Air flow meter of a heating resistor type Air flow meter of a heating resistor type

1997-09-08

1998-10-20

Biegel, Ronald L.

Measuring and testing

Volume or rate of flow

Thermal type

7320411, G01F 168

Patent

active

058248951

ABSTRACT:
A heating resistor type air flow meter for measuring the amount of air flow which passes through an intake pipe for an internal combustion engine. The air flow meter has a constant-temperature control circuit for detecting air flow, which has a bridge circuit including a heating resistor and a temperature-sensitive resistor each provided in the intake pipe, and a power amplifier circuit for amplifying a signal from the constant-temperature control circuit to generate an air flow signal. The power amplifier circuit has a plurality of amplification resistors which determine a mu-factor for the amplifier to correct the amount of air flow with respect to variation of temperature. At least an amplification resistor has a temperature coefficient different form that of the other amplification resistor, to compensate variation of the mu-factor of the power amplifier circuit.

REFERENCES:
patent: 4400974 (1983-08-01), Nishimura et al.
patent: 4682496 (1987-07-01), Miura et al.
patent: 5537871 (1996-07-01), Itsuji et al.

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