Engine air-fuel ratio converter with means for determining the d

Details Engine air-fuel ratio converter with means for determining the d Engine air-fuel ratio converter with means for determining the d

1997-12-01

1999-09-21

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60285, F01N 300

Patent

active

059539100

ABSTRACT:
An air-fuel ratio is feedback corrected based on an output signal from a first oxygen sensor situated upstream of a catalyst, and an updating amount of a feedback correction coefficient is modified based on a difference between an output signal from a second sensor situated downstream of the catalyst and a preset slice level SLR1. Catalyst deterioration is determined based on a ratio of a fluctuation frequency of the output signal of the first oxygen sensor exceeding a slice level SLF and the fluctuation frequency of the output signal of the second oxygen sensor exceeding a slice level SLR2. By setting the slice level SLR1 to a different value when deterioration diagnosis of the catalyst is being performed from when the diagnosis is not being performed, the effect of varying the updating amount on deterioration diagnosis of the catalyst is eliminated.

REFERENCES:
patent: 5088281 (1992-02-01), Izutani et al.
patent: 5255662 (1993-10-01), Nakajima
patent: 5732552 (1998-03-01), Matsumoto et al.

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