Method and apparatus for measuring the air flow in the air intak

Details Method and apparatus for measuring the air flow in the air intak Method and apparatus for measuring the air flow in the air intak

1991-01-16

1993-02-09

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320416, G01F 168

Patent

active

051845091

ABSTRACT:
A method and a circuit arrangement for measuring the air flow in the air intake passage of an internal combustion engine provide an output pulse signal which can be easily processed in digital control devices. The unbalance voltage of a measuring bridge, which is thermally coupled with a flow measuring member, is supplied to a voltage-to-frequency converter; a frequency which is proportional to the unbalance voltage of the bridge circuit is provided at the output of the voltage-to-frequency converter for further processing. At the same time, this frequency is used for triggering a monostable multivibrator which connects the flow measuring member with a voltage source in a timed manner.

REFERENCES:
patent: 2972885 (1961-02-01), Laub
patent: 3683692 (1972-08-01), Lafitte
patent: 3828332 (1974-08-01), Rekai
patent: 4043195 (1977-08-01), Hunting

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