Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-09-27
1995-04-11
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60285, 123674, 123703, F01N 320
Patent
active
054047188
ABSTRACT:
A control system which controls engine air/fuel ratio while providing a measurement of efficiency in the catalytic converter coupled to the engine exhaust. A test period is completed when counts in transitions of a feedback variable derived from an exhaust gas oxygen sensor positioned upstream of the converter have reached a preselected count for each of a plurality of inducted air flow ranges. Converter efficiency is determined during the test cycle by comparing an integration of the feedback variable, after band pass filtering and rectification, to an integration of a downstream exhaust gas oxygen sensor after its output is band pass filtered and rectified.
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Farmer David G.
Orzel Daniel V.
Truong Tri T.
Ford Motor Company
Lazarus Ira S.
Lippa Allan J.
May Roger L.
O'Connor Daniel J.
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