Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1991-07-24
1992-10-13
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, F01N 320
Patent
active
051540541
ABSTRACT:
According to the present invention, in a system wherein O.sub.2 sensors are disposed on upstream and downstream sides, respectively, of a catalytic converter, and an air-fuel ratio coefficient for the amount of fuel to be injected is determined on the basis of an output of the upstream-side O.sub.2 sensor, the deterioration of the upstream-side O.sub.2 sensor. More particularly, a delay is added to the output of the upstream-side O.sub.2 sensor in accordance with an output signal provided from the downstream-side O.sub.2 sensor, then an air-fuel ratio F/B control is performed in accordance with the delayed output, and when the F/B control period has become longer than a predetermined value, it is judged that the upstream-side O.sub.2 is deteriorated. As a result, not only the deterioration of response characteristic but also the deterioration caused by the Z characteristic center can be detected because it appears as a change of the F/B control period.
REFERENCES:
patent: 4177787 (1979-12-01), Hattori
patent: 4747265 (1988-05-01), Nagai et al.
Kurita Noriaki
Nakane Hiroaki
Hart Douglas
Nippondenso Co. Ltd.
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