Method and apparatus for detecting deterioration of a hot-wire t

Details Method and apparatus for detecting deterioration of a hot-wire t Method and apparatus for detecting deterioration of a hot-wire t

1990-06-20

1991-09-03

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

7320418, G01M 1900

Patent

active

050441965

ABSTRACT:
The present invention relates to a method and apparatus for detecting deterioration of a hot-wire type sucked air flow quantity-detecting device of an engine, in which the change ratio of the output voltage of the hot-wire type sucked air flow quantity-detecting device is measured when the output voltage of the sucked air flow quantity-detecting device is to be changed while the engine is in the substantially non-revolving state, and deterioration is judged by comparing the measured change ratio with a predetermined value, whereby it is possible to exchange parts promptly just in time and prevent degradation of the exhaust gas-purging performance of a vehicle.

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