Input processing circuit for air flow sensor

Details Input processing circuit for air flow sensor Input processing circuit for air flow sensor

1991-12-23

1992-12-01

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

731182, G01F 168

Patent

active

051671522

ABSTRACT:
An input processing circuit for an air flow sensor comprising a differential amplifier connected through two lines to an air flow sensor and having an operational amplifier an output signal from the air flow sensor and sends a result of this processing to an analogue value - digital value conversion integrated circuit. An output signal from the air flow sensor is supplied to the differential amplifier through a filter circuit so as to prevent an occurrence of error in measuring the amount of sucked air for an internal combustion engine due to various noises. A connection of an inverting input terminal end of the differential amplifier to a ground through a resistor prevents an error caused by a breakage of a reference voltage line connected between the air flow sensor and the input processing circuit. A differential input amplifier circuit also prevents an error caused by a variation in potential resulting from consumption current of an air flow sensor or the like from being generated.

REFERENCES:
patent: 3891391 (1975-06-01), Boone
patent: 3928800 (1975-12-01), Strenglein
patent: 4311042 (1982-01-01), Hasoya et al.
patent: 4391132 (1983-07-01), Egami et al.
patent: 4409828 (1983-10-01), Kohama et al.
patent: 4412520 (1983-01-01), Mitsuyasu et al.
patent: 4532218 (1985-08-01), Veno
patent: 4581930 (1986-04-01), Komons

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