Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-09-27
1994-11-15
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60285, 123674, 123703, F01N 320
Patent
active
053636465
ABSTRACT:
A control system which controls engine air/fuel ratio and provides a measurement of efficiency in the catalytic converter coupled to the engine exhaust. At the end of each of a plurality of test periods, one of three selected ratios of output signals generated from exhaust gas oxygen sensors positioned downstream and upstream of a catalytic converter are sampled and the weighted average of the selected ratio over a plurality of test periods is determined. When the weighted average exceeds a reference ratio, an indication of converter efficiency is provided. Such an indication is also provided when the selected ratio exceeds the weighted average by a preselected amount, such as three standard deviations, for a preselected number of times. The weighted average is reset to the selected ratio when the selected ratio exceeds the weighted average by a preselected amount.
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Orzel Daniel V.
Truong Tri T.
Zimlich Glenn A.
Ford Motor Company
Lazarus Ira S.
Lippa Allan J.
May Roger L.
O'Connor Daniel J.
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