Air-fuel ratio control apparatus

Details Air-fuel ratio control apparatus Air-fuel ratio control apparatus

1983-07-15

1984-12-04

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 123589, F02D 3300

Patent

active

044857861

ABSTRACT:
In an air-fuel ratio control apparatus for controlling the air-fuel ratio of an engine in accordance with the output of an O.sub.2 sensor, in response to the starting of the engine the output voltage of the O.sub.2 sensor is sampled at intervals of a unit time. The slope of the output voltage waveform of the O.sub.2 sensor is computed from the successively sampled values. The computed value is compared with a predetermined value indicative of a slope value attained when the O.sub.2 sensor is activated and thus it is considered that the O.sub.2 sensor is activiated when the computed value is greater than the predetermined value.

REFERENCES:
patent: 4155335 (1979-05-01), Hosaka et al.
patent: 4214563 (1980-07-01), Hosaka
patent: 4385613 (1983-05-01), Yoshida et al.

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