Apparatus for detecting purification factor of catalyst in catal

Details Apparatus for detecting purification factor of catalyst in catal Apparatus for detecting purification factor of catalyst in catal

1991-08-26

1993-06-22

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

052207889

ABSTRACT:
Deterioration of a catalyst of a catalytic converter of an internal combustion engine is detected, during negative feedback control of the air-fuel ratio based on an output signal from at least one of a pair of O.sub.2 sensors disposed respectively upstream and downstream from the catalyst in the exhaust system. Detection is executed after changing the feedback period, which is the period of alternation of a feedback correction coefficient used to control the fuel injection quantity, with the change in period being such as to provide improved accuracy of detection of catalyst deterioration. The change may consist of a single step change, in which the feedback period is set to a specific predetermined value at which the output signal amplitude from the downstream sensor, or the phase difference between the two sensor output signals, should be within predetermined limits if the catalyst is in satisfactory condition.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 3969932 (1976-07-01), Rieger et al.
patent: 4622809 (1986-11-01), Abthoff
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 5018348 (1991-05-01), Durschmidt
patent: 5077970 (1992-01-01), Hamburg

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