Intake air flow rate measuring apparatus for use in internal com

Details Intake air flow rate measuring apparatus for use in internal com Intake air flow rate measuring apparatus for use in internal com

1989-10-24

1990-12-11

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

7320419, G01F 168

Patent

active

049761404

ABSTRACT:
In a drive processing circuit comprising a flow velocity measuring resistor and a temperature compensating resistor of a hot wire type air flow meter, a resistor is inserted between a connecting point of two resistors and an inverting input terminal of an operational amplifier. A condenser is inserted between an inverting input terminal of the amplifier and the non-inverting input terminal of the amplifier. A resistant value of the inserted resistor is set larger than a resistant value of the temperature compensating resistor. A low pass filter comprises the inserted resistor and the inserted condenser. The high frequency noises, which intrude through the temperature compensating resistor, are cut-off by the low pass filter.

REFERENCES:
patent: 4196622 (1980-04-01), Peter
patent: 4297881 (1981-11-01), Sasayama et al.
patent: 4400974 (1983-08-01), Nishimura et al.
patent: 4838078 (1989-06-01), Tsutsumi

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