Internal combustion engine controller with exhaust gas purificat

Details Internal combustion engine controller with exhaust gas purificat Internal combustion engine controller with exhaust gas purificat

1992-11-18

1998-10-13

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

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

60285, F01M 300

Patent

active

058195300

ABSTRACT:
A conversion efficiency of a catalyst is determined by a cross correlation function of a cross-correlation between an output of an oxygen sensor at the upstream of the catalyst and an output of an oxygen sensor at the downstream of the catalyst, to thereby monitor deterioration index of the catalyst. Then, an air and fuel ratio is obtained from at least one of the outputs of the two oxygen sensors, to thereby adjust a fuel supply quantity, so that the fuel supply quantity can be controlled even during a period when the catalyst is being analyzed, without deviating the air and fuel ratio from a target air and fuel ratio.

REFERENCES:
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 5179833 (1993-01-01), Kuroda et al.
W.B. Clemens, M.A. Sabourin, T. Rao, "Detection of Catalyst Performance Loss Using on-Board Diagnostics", SAE paper 90 00 62, 1990.
J. Kasedorf, "Benzineinsoritzung", Vogel-Verlage, Wurzburg 1983, p. 296.
SAE Technical Paper Series--900062 pp. 1-17. Mar. 1990.

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