Air/fuel control system with catalytic converter monitoring for

Details Air/fuel control system with catalytic converter monitoring for Air/fuel control system with catalytic converter monitoring for

1995-08-31

1997-08-05

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60285, 123198F, 123481, F01N 320

Patent

active

056531028

ABSTRACT:
A control system and method for indicating the efficiency of a catalytic converter coupled to a variable displacement engine. A preselected group of cylinders is activated in a first engine operating and all cylinders are activated during a second engine operating mode. A converter test period is provided when a count in output transitions of the upstream sensor reaches a first preselected value while operating in the first mode and count in transitions of the upstream sensor reaches a second preselected value while operating in the second mode. Converter efficiency is generated by computing a ratio of upstream sensor counts to downstream sensor counts during the test period.

REFERENCES:
patent: 4024850 (1977-05-01), Peter
patent: 4165610 (1979-08-01), Iizuka
patent: 4201180 (1980-05-01), Iizuka
patent: 5115639 (1992-05-01), Gopp
patent: 5357751 (1994-10-01), Orzel
patent: 5408966 (1995-04-01), Lipinski et al.
patent: 5481461 (1996-01-01), Miyamoto

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