Apparatus for detecting deterioration of catalyst of internal co

Details Apparatus for detecting deterioration of catalyst of internal co Apparatus for detecting deterioration of catalyst of internal co

1992-12-23

1994-01-18

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 123691, 123692, F01N 328

Patent

active

052791149

ABSTRACT:
Disclosed is an apparatus for detecting deterioration of a catalyst of an internal combustion engine having a plurality of cylinder banks in such a manner that the deterioration of the catalyst can be assuredly discriminated regardless of the presence of deviation of a control phase with respect to each cylinder bank. The influence of change of the air/fuel ratio can be eliminated considerably by reducing the air/fuel ratio correction coefficient for a right bank, or by also using the correction coefficient for the left bank as that for the right bank to cause the phases of them to be synchronized with each other, or by dither-controlling the right bank. Therefore, the change of the air/fuel ratio with respect to the left bank can be assuredly detected while necessitating one sub air/fuel ratio sensor. By discriminating the state of deterioration of the catalyst in accordance with results of detections made by the left air/fuel ratio sensor and the sub air/fuel ratio sensors, the deterioration of the catalyst can be assuredly discriminated regardless of the presence of deviation of control phase with respect to the two banks.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 5154055 (1992-10-01), Nakane et al.
patent: 5207057 (1993-05-01), Kayanuma
patent: 5220788 (1993-06-01), Kurita
patent: 5228287 (1993-07-01), Kuronishi
Koupal et al, "Detection of Catalyst Failure On-Vehicle Using the Dual Oxygen Sensor Method", SAE Technical Paper Series, 910560, Feb., 1991. pp. 135-146.

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