Method for measuring air flow

Details Method for measuring air flow Method for measuring air flow

1982-09-14

1985-04-16

Caldwell, Sr., John W.

Measuring and testing

Simulating operating condition

Marine

73204, G01M 1500

Patent

active

045107955

ABSTRACT:
A method is proposed for measuring the throughput of a medium, in particular the air aspirated by an internal combustion engine, in a flow cross section and for correcting the flowthrough measurement value (U.sub.s) furnished by a air flow measuring device in the event of a pulsating flow. To this end, the air flow measurement value (U.sub.s) is modified, in a selected range of the characteristic curve of the air flow measuring device, in such a manner that the error in the air flow measurement value (U.sub.s) resulting from the pulsation of the medium is reduced or compensated for. The range of the characteristic curve selected for modification of the air flow measurement value (U.sub.s) preferably is located below a minimum air flow measurement value (U.sub.sm) characterizing a minimum air flow value (Q.sub.m). In like manner, in order to modify the air flow measurement value (U.sub.s) below the minimum air flow measurement value (U.sub.sm) characterizing the minimum air flow value (Q.sub.m), a corrective air flow measurement value (U.sub.sk) can be established, which is smaller than the air flow value (U.sub.so) at an air flow value of zero.

REFERENCES:
patent: 4213335 (1980-07-01), Peter et al.
patent: 4275695 (1981-06-01), Bauer
patent: 4311042 (1982-01-01), Hosoya
Stoll, H. W., Flow: It's Measurement and Control in Science and Industry, vol. 1, Instrument Society of America, 1974, p. 197.

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